Merge commit 'c1073460677ba8aa2e325a1c57c3db1458f9fde5' as 'src/deps/src/luasocket'
This commit is contained in:
Théophile Diot
commit
f85f86e46c
|
|
@ -0,0 +1,23 @@
|
|||
root = true
|
||||
|
||||
[*]
|
||||
end_of_line = lf
|
||||
insert_final_newline = true
|
||||
trim_trailing_whitespace = true
|
||||
charset = utf-8
|
||||
|
||||
[{*.lua,*.rockspec,.luacheckrc}]
|
||||
indent_style = space
|
||||
indent_size = 4
|
||||
|
||||
[Makefile]
|
||||
indent_style = tab
|
||||
indent_size = 4
|
||||
|
||||
[*.html]
|
||||
indent_style = space
|
||||
indent_size = 4
|
||||
|
||||
[*.{c,h}]
|
||||
indent_style = space
|
||||
indent_size = 4
|
||||
|
|
@ -0,0 +1,45 @@
|
|||
name: Build
|
||||
|
||||
on:
|
||||
push:
|
||||
branches:
|
||||
- master
|
||||
pull_request:
|
||||
|
||||
jobs:
|
||||
build:
|
||||
name: Test build on ${{ matrix.platform }}
|
||||
strategy:
|
||||
fail-fast: false
|
||||
matrix:
|
||||
luaVersion: [ "5.4", "5.3", "5.2", "5.1", "luajit", "luajit-openresty" ]
|
||||
platform: [ "ubuntu-20.04", "macos-11" ] # "windows-2022" not supported by gh-actions-lua
|
||||
runs-on: ${{ matrix.platform }}
|
||||
steps:
|
||||
- name: Checkout
|
||||
uses: actions/checkout@v3
|
||||
- name: Setup ‘lua’
|
||||
uses: leafo/gh-actions-lua@v9
|
||||
with:
|
||||
luaVersion: ${{ matrix.luaVersion }}
|
||||
- name: Setup ‘luarocks’
|
||||
uses: leafo/gh-actions-luarocks@v4
|
||||
- name: Make and install
|
||||
run: |
|
||||
export DEBUG=DEBUG
|
||||
luarocks make -- luasocket-scm-3.rockspec
|
||||
- name: Run regression tests
|
||||
run: |
|
||||
cd test
|
||||
lua hello.lua
|
||||
lua testsrvr.lua > /dev/null &
|
||||
lua testclnt.lua
|
||||
lua stufftest.lua
|
||||
lua excepttest.lua
|
||||
lua test_bind.lua
|
||||
lua test_getaddrinfo.lua
|
||||
lua ltn12test.lua
|
||||
lua mimetest.lua
|
||||
lua urltest.lua
|
||||
lua test_socket_error.lua
|
||||
kill %1
|
||||
|
|
@ -0,0 +1,34 @@
|
|||
name: Deploy
|
||||
|
||||
on: [ push, workflow_dispatch ]
|
||||
|
||||
jobs:
|
||||
|
||||
affected:
|
||||
uses: lunarmodules/.github/.github/workflows/list_affected_rockspecs.yml@main
|
||||
|
||||
build:
|
||||
needs: affected
|
||||
if: ${{ needs.affected.outputs.rockspecs }}
|
||||
uses: lunarmodules/.github/.github/workflows/test_build_rock.yml@main
|
||||
with:
|
||||
rockspecs: ${{ needs.affected.outputs.rockspecs }}
|
||||
|
||||
upload:
|
||||
needs: [ affected, build ]
|
||||
# Only run upload if:
|
||||
# 1. We are on the canonical repository (no uploads from forks)
|
||||
# 2. The current commit is either tagged or on the default branch (the workflow will upload dev/scm rockspecs any
|
||||
# time they are touched, tagged ones whenever the edited rockspec and tag match)
|
||||
# 3. Some rockspecs were changed — this implies the commit changing the rockspec is the same one that gets tagged
|
||||
if: >-
|
||||
${{
|
||||
github.repository == 'lunarmodules/luasocket' &&
|
||||
( github.ref_name == 'master' || startsWith(github.ref, 'refs/tags/') ) &&
|
||||
needs.affected.outputs.rockspecs
|
||||
}}
|
||||
uses: lunarmodules/.github/.github/workflows/upload_to_luarocks.yml@main
|
||||
with:
|
||||
rockspecs: ${{ needs.affected.outputs.rockspecs }}
|
||||
secrets:
|
||||
apikey: ${{ secrets.LUAROCKS_APIKEY }}
|
||||
|
|
@ -0,0 +1,13 @@
|
|||
name: Luacheck
|
||||
|
||||
on: [push, pull_request]
|
||||
|
||||
jobs:
|
||||
|
||||
luacheck:
|
||||
runs-on: ubuntu-20.04
|
||||
steps:
|
||||
- name: Checkout
|
||||
uses: actions/checkout@v3
|
||||
- name: Luacheck
|
||||
uses: lunarmodules/luacheck@v0
|
||||
|
|
@ -0,0 +1,15 @@
|
|||
*.o
|
||||
*.so
|
||||
*.so.*
|
||||
*.obj
|
||||
*.lib
|
||||
*.dll*
|
||||
*.user
|
||||
*.sdf
|
||||
Debug
|
||||
Release
|
||||
*.manifest
|
||||
*.swp
|
||||
*.suo
|
||||
x64
|
||||
|
||||
|
|
@ -0,0 +1,31 @@
|
|||
unused_args = false
|
||||
redefined = false
|
||||
max_line_length = false
|
||||
|
||||
not_globals = {
|
||||
"string.len",
|
||||
"table.getn",
|
||||
}
|
||||
|
||||
include_files = {
|
||||
"**/*.lua",
|
||||
"**/*.rockspec",
|
||||
".busted",
|
||||
".luacheckrc",
|
||||
}
|
||||
|
||||
exclude_files = {
|
||||
"etc/*.lua",
|
||||
"etc/**/*.lua",
|
||||
"test/*.lua",
|
||||
"test/**/*.lua",
|
||||
"samples/*.lua",
|
||||
"samples/**/*.lua",
|
||||
"gem/*.lua",
|
||||
"gem/**/*.lua",
|
||||
-- GH Actions Lua Environment
|
||||
".lua",
|
||||
".luarocks",
|
||||
".install",
|
||||
}
|
||||
|
||||
|
|
@ -0,0 +1,65 @@
|
|||
# Changelog
|
||||
|
||||
## [v3.1.0](https://github.com/lunarmodules/luasocket/releases/v3.1.0) — 2022-07-27
|
||||
|
||||
* Add support for TCP Defer Accept – @Zash
|
||||
* Add support for TCP Fast Open – @Zash
|
||||
* Fix Windows (mingw32) builds – @goldenstein64
|
||||
* Avoid build warnings on 64-bit Windows – @rpatters1
|
||||
|
||||
## [v3.0.0](https://github.com/lunarmodules/luasocket/releases/v3.0.0) — 2022-03-25
|
||||
|
||||
The last time LuaSocket had a stable release tag was 14 years ago when 2.0.2 was tagged.
|
||||
A v3 release candidate was tagged 9 years ago.
|
||||
Since then it has been downloaded over 3 million times.
|
||||
Additionally the Git repository regularly gets several hundred clones a day.
|
||||
But 9 years is a long time and even the release candidate has grown a bit long in the tooth.
|
||||
Many Linux distros have packaged the current Git HEAD or some specific tested point as dated or otherwise labeled releases.
|
||||
256 commits later and having been migrated to the @lunarmodules org namespace on GitHub, please welcome v3.
|
||||
|
||||
This release is a "safe-harbor" tag that represents a minimal amount of changes to get a release tagged.
|
||||
Beyond some CI tooling, very little code has changed since migration to @lunarmodules ([5b18e47..e47d98f](https://github.com/lunarmodules/luasocket/compare/5b18e47..e47d98f?w=1)):
|
||||
|
||||
* Lua 5.4.3+ support – @pkulchenko, @Zash
|
||||
* Cleanup minor issues to get a code linter to pass – @Tieske, @jyoui, @alerque
|
||||
* Update Visual Studio build rules for Lua 5.1 – @ewestbrook
|
||||
* Set http transfer-encoding even without content-length – @tokenrove
|
||||
|
||||
Prior to migration to @lunarmodules ([v3.0-rc1..5b18e47](https://github.com/lunarmodules/luasocket/compare/v3.0-rc1..5b18e47?w=1)) many things happened of which the author of this changelog is not fully apprised.
|
||||
Your best bet if it affects your project somehow is to read the commit log & diffs yourself.
|
||||
|
||||
## [v3.0-rc1](https://github.com/lunarmodules/luasocket/releases/v3.0-rc1) — 2013-06-14
|
||||
|
||||
Main changes for LuaSocket 3.0-rc1 are IPv6 support and Lua 5.2 compatibility.
|
||||
|
||||
* Added: Compatible with Lua 5.2
|
||||
- Note that unless you define LUA_COMPAT_MODULE, package tables will not be exported as globals!
|
||||
* Added: IPv6 support;
|
||||
- Socket.connect and socket.bind support IPv6 addresses;
|
||||
- Getpeername and getsockname support IPv6 addresses, and return the socket family as a third value;
|
||||
- URL module updated to support IPv6 host names;
|
||||
- New socket.tcp6 and socket.udp6 functions;
|
||||
- New socket.dns.getaddrinfo and socket.dns.getnameinfo functions;
|
||||
* Added: getoption method;
|
||||
* Fixed: url.unescape was returning additional values;
|
||||
* Fixed: mime.qp, mime.unqp, mime.b64, and mime.unb64 could mistaking their own stack slots for functions arguments;
|
||||
* Fixed: Receiving zero-length datagram is now possible;
|
||||
* Improved: Hidden all internal library symbols;
|
||||
* Improved: Better error messages;
|
||||
* Improved: Better documentation of socket options.
|
||||
* Fixed: manual sample of HTTP authentication now uses correct "authorization" header (Alexandre Ittner);
|
||||
* Fixed: failure on bind() was destroying the socket (Sam Roberts);
|
||||
* Fixed: receive() returns immediatelly if prefix can satisfy bytes requested (M Joonas Pihlaja);
|
||||
* Fixed: multicast didn't work on Windows, or anywhere else for that matter (Herbert Leuwer, Adrian Sietsma);
|
||||
* Fixed: select() now reports an error when called with more sockets than FD_SETSIZE (Lorenzo Leonini);
|
||||
* Fixed: manual links to home.html changed to index.html (Robert Hahn);
|
||||
* Fixed: mime.unb64() would return an empty string on results that started with a null character (Robert Raschke);
|
||||
* Fixed: HTTP now automatically redirects on 303 and 307 (Jonathan Gray);
|
||||
* Fixed: calling sleep() with negative numbers could block forever, wasting CPU. Now it returns immediately (MPB);
|
||||
* Improved: FTP commands are now sent in upper case to help buggy servers (Anders Eurenius);
|
||||
* Improved: known headers now sent in canonic capitalization to help buggy servers (Joseph Stewart);
|
||||
* Improved: Clarified tcp:receive() in the manual (MPB);
|
||||
* Improved: Decent makefiles (LHF).
|
||||
* Fixed: RFC links in documentation now point to IETF (Cosmin Apreutesei).
|
||||
|
||||
## [v2.0.2](https://github.com/lunarmodules/luasocket/releases/v2.0.2) — 2007-09-11
|
||||
|
|
@ -0,0 +1,28 @@
|
|||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
http was preserving old host header during redirects
|
||||
fix smtp.send hang on source error
|
||||
add create field to FTP and SMTP and fix HTTP ugliness
|
||||
clean timeout argument to open functions in SMTP, HTTP and FTP
|
||||
eliminate globals from namespaces created by module().
|
||||
url.absolute was not working when base_url was already parsed
|
||||
http.request was redirecting even when the location header was empty
|
||||
tcp{client}:shutdown() was checking for group instead of class.
|
||||
tcp{client}:send() now returns i+sent-1...
|
||||
get rid of a = socket.try() in the manual, except for protected cases. replace it with assert.
|
||||
get rid of "base." kludge in package.loaded
|
||||
check all "require("http")" etc in the manual.
|
||||
make sure sock_gethostname.* only return success if the hp is not null!
|
||||
change 'l' prefix in C libraries to 'c' to avoid clash with LHF libraries
|
||||
don't forget the declarations in luasocket.h and mime.h!!!
|
||||
setpeername was using udp{unconnected}
|
||||
fixed a bug in http.lua that caused some requests to fail (Florian Berger)
|
||||
fixed a bug in select.c that prevented sockets with descriptor 0 from working (Renato Maia)
|
||||
fixed a "bug" that caused dns.toip to crash under uLinux
|
||||
fixed a "bug" that caused a crash in gethostbyname under VMS
|
||||
DEBUG and VERSION became _DEBUG and _VERSION
|
||||
send returns the right value if input is "". Alexander Marinov
|
||||
|
|
@ -0,0 +1,19 @@
|
|||
Copyright (C) 2004-2022 Diego Nehab
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a
|
||||
copy of this software and associated documentation files (the "Software"),
|
||||
to deal in the Software without restriction, including without limitation
|
||||
the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
||||
and/or sell copies of the Software, and to permit persons to whom the
|
||||
Software is furnished to do so, subject to the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be included in
|
||||
all copies or substantial portions of the Software.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
||||
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
||||
DEALINGS IN THE SOFTWARE.
|
||||
|
|
@ -0,0 +1,49 @@
|
|||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
|
||||
<ImportGroup Label="PropertySheets" />
|
||||
<PropertyGroup Condition="'$(Platform)'=='x64'" Label="LuaPlat">
|
||||
<LUAPLAT>$(Platform)/$(Configuration)</LUAPLAT>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Platform)'=='Win32'" Label="LuaPlat">
|
||||
<LUAPLAT>$(Configuration)</LUAPLAT>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Label="UserMacros">
|
||||
<LUAV>5.3</LUAV>
|
||||
<LUAPREFIX>z:\data\build\vc14\</LUAPREFIX>
|
||||
<LUALIB>$(LUAPREFIX)\lib\lua\$(LUAV)\$(LUAPLAT)</LUALIB>
|
||||
<LUACDIR>$(LUAPREFIX)\bin\lua\$(LUAV)\$(LUAPLAT)</LUACDIR>
|
||||
<LUALDIR>$(LUAPREFIX)\bin\lua\$(LUAV)\$(LUAPLAT)\lua</LUALDIR>
|
||||
<LUAINC>$(LUAPREFIX)\include\lua\$(LUAV);$(LUAPREFIX)\include\lua$(LUAV)</LUAINC>
|
||||
<LUALIBNAME>lua$(LUAV.Replace('.', '')).lib</LUALIBNAME>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup>
|
||||
<_PropertySheetDisplayName>Lua</_PropertySheetDisplayName>
|
||||
</PropertyGroup>
|
||||
<ItemDefinitionGroup />
|
||||
<ItemGroup>
|
||||
<BuildMacro Include="LUAPLAT">
|
||||
<Value>$(LUAPLAT)</Value>
|
||||
</BuildMacro>
|
||||
<BuildMacro Include="LUAPREFIX">
|
||||
<Value>$(LUAPREFIX)</Value>
|
||||
</BuildMacro>
|
||||
<BuildMacro Include="LUAV">
|
||||
<Value>$(LUAV)</Value>
|
||||
</BuildMacro>
|
||||
<BuildMacro Include="LUALIB">
|
||||
<Value>$(LUALIB)</Value>
|
||||
</BuildMacro>
|
||||
<BuildMacro Include="LUAINC">
|
||||
<Value>$(LUAINC)</Value>
|
||||
</BuildMacro>
|
||||
<BuildMacro Include="LUACDIR">
|
||||
<Value>$(LUACDIR)</Value>
|
||||
</BuildMacro>
|
||||
<BuildMacro Include="LUALDIR">
|
||||
<Value>$(LUALDIR)</Value>
|
||||
</BuildMacro>
|
||||
<BuildMacro Include="LUALIBNAME">
|
||||
<Value>$(LUALIBNAME)</Value>
|
||||
</BuildMacro>
|
||||
</ItemGroup>
|
||||
</Project>
|
||||
|
|
@ -0,0 +1,12 @@
|
|||
# LuaSocket
|
||||
|
||||
|
||||
[](https://github.com/lunarmodules/luasocket/actions?workflow=Build)
|
||||
[](https://github.com/lunarmodules/luasocket/actions?workflow=Luacheck)
|
||||
[](https://github.com/lunarmodules/luasocket/releases)
|
||||
[](https://luarocks.org/modules/lunarmodules/luasocket)
|
||||
|
||||
LuaSocket is a Lua extension library composed of two parts:
|
||||
|
||||
1. a set of C modules that provide support for the TCP and UDP transport layers, and
|
||||
2. a set of Lua modules that provide functions commonly needed by applications that deal with the Internet.
|
||||
|
|
@ -0,0 +1,81 @@
|
|||
- bizarre default values for getnameinfo should throw error instead!
|
||||
|
||||
> It's just too bad it can't talk to gmail -
|
||||
> reason 1: they absolutely want TLS
|
||||
> reason 2: unlike all the other SMTP implementations, they
|
||||
> don't
|
||||
> tolerate missing < > around adresses
|
||||
|
||||
- document the new bind and connect behavior.
|
||||
- shouldn't we instead make the code compatible to Lua 5.2
|
||||
without any compat stuff, and use a compatibility layer to
|
||||
make it work on 5.1?
|
||||
- add what's new to manual
|
||||
- should there be an equivalent to tohostname for IPv6?
|
||||
- should we add service name resolution as well to getaddrinfo?
|
||||
- Maybe the sockaddr to presentation conversion should be done with getnameinfo()?
|
||||
|
||||
- add http POST sample to manual
|
||||
people keep asking stupid questions
|
||||
- documentation of dirty/getfd/setfd is problematic because of portability
|
||||
same for unix and serial.
|
||||
what to do about this? add a stronger disclaimer?
|
||||
- fix makefile with decent defaults?
|
||||
|
||||
Done:
|
||||
|
||||
- added IPv6 support to getsockname
|
||||
- simplified getpeername implementation
|
||||
- added family to return of getsockname and getpeername
|
||||
and added modification to the manual to describe
|
||||
|
||||
- connect and bind try all adresses returned by getaddrinfo
|
||||
- document headers.lua?
|
||||
- update copyright date everywhere?
|
||||
- remove RCSID from files?
|
||||
- move version to 2.1 rather than 2.1.1?
|
||||
- fixed url package to support ipv6 hosts
|
||||
- changed domain to family
|
||||
- implement getfamily methods.
|
||||
|
||||
- remove references to Lua 5.0 from documentation, add 5.2?
|
||||
- update lua and luasocket version in samples in documentation
|
||||
- document ipv5_v6only default option being set?
|
||||
- document tcp6 and udp6
|
||||
- document dns.getaddrinfo
|
||||
- documented zero-sized datagram change?
|
||||
no.
|
||||
- document unix socket and serial socket? add raw support?
|
||||
no.
|
||||
- document getoption
|
||||
- merge luaL_typeerror into auxiliar to avoid using luaL prefix?
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
replace \r\n with \0xD\0xA in everything
|
||||
New mime support
|
||||
|
||||
ftp send should return server replies?
|
||||
make sure there are no object files in the distribution tarball
|
||||
http handling of 100-continue, see DB patch
|
||||
DB ftp.lua bug.
|
||||
test unix.c to return just a function and works with require"unix"
|
||||
get rid of setmetatable(, nil) since packages don't need this anymore in 5.1
|
||||
compat-5.1 novo
|
||||
ajeitar pra lua-5.1
|
||||
|
||||
adicionar exemplos de expansão: pipe, local, named pipe
|
||||
testar os options!
|
||||
|
||||
|
||||
- Thread-unsafe functions to protect
|
||||
gethostbyname(), gethostbyaddr(), gethostent(),
|
||||
inet_ntoa(), strerror(),
|
||||
|
||||
|
|
@ -0,0 +1,22 @@
|
|||
... as an l-value to get all results of a function call?
|
||||
at least ...[i] and #...
|
||||
extend to full tuples?
|
||||
|
||||
__and __or __not metamethods
|
||||
|
||||
lua_tostring, lua_tonumber, lua_touseradta etc push values in stack
|
||||
__tostring,__tonumber, __touserdata metamethods are checked
|
||||
and expected to push an object of correct type on stack
|
||||
|
||||
lua_rawtostring, lua_rawtonumber, lua_rawtouserdata don't
|
||||
push anything on stack, return data of appropriate type,
|
||||
skip metamethods and throw error if object not of exact type
|
||||
|
||||
package.findfile exported
|
||||
module not polluting the global namespace
|
||||
|
||||
coxpcall with a coroutine pool for efficiency (reusing coroutines)
|
||||
|
||||
exception mechanism formalized? just like the package system was.
|
||||
|
||||
a nice bitlib in the core
|
||||
|
|
@ -0,0 +1,183 @@
|
|||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
||||
"http://www.w3.org/TR/html4/strict.dtd">
|
||||
<html>
|
||||
|
||||
<head>
|
||||
<meta name="description" content="LuaSocket: DNS support">
|
||||
<meta name="keywords" content="Lua, LuaSocket, DNS, Network, Library, Support">
|
||||
<title>LuaSocket: DNS support</title>
|
||||
<link rel="stylesheet" href="reference.css" type="text/css">
|
||||
</head>
|
||||
|
||||
<body>
|
||||
|
||||
<!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="header">
|
||||
<hr>
|
||||
<center>
|
||||
<table summary="LuaSocket logo">
|
||||
<tr><td align="center"><a href="http://www.lua.org">
|
||||
<img width="128" height="128" border="0" alt="LuaSocket" src="luasocket.png">
|
||||
</a></td></tr>
|
||||
<tr><td align="center" valign="top">Network support for the Lua language
|
||||
</td></tr>
|
||||
</table>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
</center>
|
||||
<hr>
|
||||
</div>
|
||||
|
||||
<!-- dns ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2 id="dns">DNS</h2>
|
||||
|
||||
<p>
|
||||
IPv4 name resolution functions
|
||||
<a href="#toip"><tt>dns.toip</tt></a>
|
||||
and
|
||||
<a href="#tohostname"><tt>dns.tohostname</tt></a>
|
||||
return <em>all</em> information obtained from
|
||||
the resolver in a table of the form:
|
||||
</p>
|
||||
|
||||
<blockquote><tt>
|
||||
resolved4 = {<br>
|
||||
name = <i>canonic-name</i>,<br>
|
||||
alias = <i>alias-list</i>,<br>
|
||||
ip = <i>ip-address-list</i><br>
|
||||
}
|
||||
</tt> </blockquote>
|
||||
|
||||
<p>
|
||||
Note that the <tt>alias</tt> list can be empty.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The more general name resolution function
|
||||
<a href="#getaddrinfo"><tt>dns.getaddrinfo</tt></a>, which
|
||||
supports both IPv6 and IPv4,
|
||||
returns <em>all</em> information obtained from
|
||||
the resolver in a table of the form:
|
||||
</p>
|
||||
|
||||
<blockquote><tt>
|
||||
resolved6 = {<br>
|
||||
[1] = {<br>
|
||||
family = <i>family-name-1</i>,<br>
|
||||
addr = <i>address-1</i><br>
|
||||
},<br>
|
||||
...<br>
|
||||
[n] = {<br>
|
||||
family = <i>family-name-n</i>,<br>
|
||||
addr = <i>address-n</i><br>
|
||||
}<br>
|
||||
}
|
||||
</tt> </blockquote>
|
||||
|
||||
<p>
|
||||
Here, <tt>family</tt> contains the string <tt>"inet"</tt> for IPv4
|
||||
addresses, and <tt>"inet6"</tt> for IPv6 addresses.
|
||||
</p>
|
||||
|
||||
<!-- getaddrinfo ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="getaddrinfo">
|
||||
socket.dns.<b>getaddrinfo(</b>address<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Converts from host name to address.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Address</tt> can be an IPv4 or IPv6 address or host name.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns a table with all information returned by
|
||||
the resolver. In case of error, the function returns <b><tt>nil</tt></b>
|
||||
followed by an error message.
|
||||
</p>
|
||||
|
||||
<!-- gethostname ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="gethostname">
|
||||
socket.dns.<b>gethostname()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns the standard host name for the machine as a string.
|
||||
</p>
|
||||
|
||||
<!-- tohostname +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="tohostname">
|
||||
socket.dns.<b>tohostname(</b>address<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Converts from IPv4 address to host name.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Address</tt> can be an IP address or host name.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns a string with the canonic host name of the given
|
||||
<tt>address</tt>, followed by a table with all information returned by
|
||||
the resolver. In case of error, the function returns <b><tt>nil</tt></b>
|
||||
followed by an error message.
|
||||
</p>
|
||||
|
||||
<!-- toip +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="toip">
|
||||
socket.dns.<b>toip(</b>address<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Converts from host name to IPv4 address.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Address</tt> can be an IP address or host name.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
Returns a string with the first IP address found for <tt>address</tt>,
|
||||
followed by a table with all information returned by the resolver.
|
||||
In case of error, the function returns <b><tt>nil</tt></b> followed by an error
|
||||
message.
|
||||
</p>
|
||||
|
||||
<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="footer">
|
||||
<hr>
|
||||
<center>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#down">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
<p>
|
||||
<small>
|
||||
Last modified by Diego Nehab on <br>
|
||||
Thu Apr 20 00:25:07 EDT 2006
|
||||
</small>
|
||||
</p>
|
||||
</center>
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,288 @@
|
|||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
||||
"http://www.w3.org/TR/html4/strict.dtd">
|
||||
<html>
|
||||
|
||||
<head>
|
||||
<meta name="description" content="LuaSocket: FTP support">
|
||||
<meta name="keywords" content="Lua, LuaSocket, FTP, Network, Library, Support">
|
||||
<title>LuaSocket: FTP support</title>
|
||||
<link rel="stylesheet" href="reference.css" type="text/css">
|
||||
</head>
|
||||
|
||||
<body>
|
||||
|
||||
<!-- header ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="header">
|
||||
<hr>
|
||||
<center>
|
||||
<table summary="LuaSocket logo">
|
||||
<tr><td align="center"><a href="http://www.lua.org">
|
||||
<img width="128" height="128" border="0" alt="LuaSocket" src="luasocket.png">
|
||||
</a></td></tr>
|
||||
<tr><td align="center" valign="top">Network support for the Lua language
|
||||
</td></tr>
|
||||
</table>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
</center>
|
||||
<hr>
|
||||
</div>
|
||||
|
||||
<!-- ftp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2 id="ftp">FTP</h2>
|
||||
|
||||
<p>
|
||||
FTP (File Transfer Protocol) is a protocol used to transfer files
|
||||
between hosts. The <tt>ftp</tt> namespace offers thorough support
|
||||
to FTP, under a simple interface. The implementation conforms to
|
||||
<a href="http://www.ietf.org/rfc/rfc959.txt">RFC 959</a>.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
High level functions are provided supporting the most common operations.
|
||||
These high level functions are implemented on top of a lower level
|
||||
interface. Using the low-level interface, users can easily create their
|
||||
own functions to access <em>any</em> operation supported by the FTP
|
||||
protocol. For that, check the implementation.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
To really benefit from this module, a good understanding of
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">
|
||||
LTN012, Filters sources and sinks</a> is necessary.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
To obtain the <tt>ftp</tt> namespace, run:
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- loads the FTP module and any libraries it requires
|
||||
local ftp = require("socket.ftp")
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
URLs MUST conform to
|
||||
<a href="http://www.ietf.org/rfc/rfc1738.txt">RFC 1738</a>,
|
||||
that is, an URL is a string in the form:
|
||||
</p>
|
||||
|
||||
<blockquote>
|
||||
<tt>
|
||||
[ftp://][<user>[:<password>]@]<host>[:<port>][/<path>][<i>type</i>=a|i]</tt>
|
||||
</blockquote>
|
||||
|
||||
<p>
|
||||
The following constants in the namespace can be set to control the default behavior of
|
||||
the FTP module:
|
||||
</p>
|
||||
|
||||
<ul>
|
||||
<li> <tt>PASSWORD</tt>: default anonymous password.</li>
|
||||
<li> <tt>TIMEOUT</tt>: sets the timeout for all I/O operations;</li>
|
||||
<li> <tt>USER</tt>: default anonymous user;</li>
|
||||
</ul>
|
||||
|
||||
|
||||
<!-- ftp.get ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="get">
|
||||
ftp.<b>get(</b>url<b>)</b><br>
|
||||
ftp.<b>get{</b><br>
|
||||
host = <i>string</i>,<br>
|
||||
sink = <i>LTN12 sink</i>,<br>
|
||||
argument <i>or</i> path = <i>string</i>,<br>
|
||||
[user = <i>string</i>,]<br>
|
||||
[password = <i>string</i>]<br>
|
||||
[command = <i>string</i>,]<br>
|
||||
[port = <i>number</i>,]<br>
|
||||
[type = <i>string</i>,]<br>
|
||||
[step = <i>LTN12 pump step</i>,]<br>
|
||||
[create = <i>function</i>]<br>
|
||||
<b>}</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
The <tt>get</tt> function has two forms. The simple form has fixed
|
||||
functionality: it downloads the contents of a URL and returns it as a
|
||||
string. The generic form allows a <em>lot</em> more control, as explained
|
||||
below.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
If the argument of the <tt>get</tt> function is a table, the function
|
||||
expects at least the fields <tt>host</tt>, <tt>sink</tt>, and one of
|
||||
<tt>argument</tt> or <tt>path</tt> (<tt>argument</tt> takes
|
||||
precedence). <tt>Host</tt> is the server to connect to. <tt>Sink</tt> is
|
||||
the <em>simple</em>
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
|
||||
sink that will receive the downloaded data. <tt>Argument</tt> or
|
||||
<tt>path</tt> give the target path to the resource in the server. The
|
||||
optional arguments are the following:
|
||||
</p>
|
||||
<ul>
|
||||
<li><tt>user</tt>, <tt>password</tt>: User name and password used for
|
||||
authentication. Defaults to "<tt>ftp:anonymous@anonymous.org</tt>";</li>
|
||||
<li><tt>command</tt>: The FTP command used to obtain data. Defaults to
|
||||
"<tt>retr</tt>", but see example below;</li>
|
||||
<li><tt>port</tt>: The port to used for the control connection. Defaults to 21;</li>
|
||||
<li><tt>type</tt>: The transfer mode. Can take values "<tt>i</tt>" or
|
||||
"<tt>a</tt>". Defaults to whatever is the server default;</li>
|
||||
<li><tt>step</tt>:
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
|
||||
pump step function used to pass data from the
|
||||
server to the sink. Defaults to the LTN12 <tt>pump.step</tt> function;</li>
|
||||
<li><tt>create</tt>: An optional function to be used instead of
|
||||
<a href="tcp.html#socket.tcp"><tt>socket.tcp</tt></a> when the communications socket is created.</li>
|
||||
</ul>
|
||||
|
||||
<p class="return">
|
||||
If successful, the simple version returns the URL contents as a
|
||||
string, and the generic function returns 1. In case of error, both
|
||||
functions return <b><tt>nil</tt></b> and an error message describing the
|
||||
error.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- load the ftp support
|
||||
local ftp = require("socket.ftp")
|
||||
|
||||
-- Log as user "anonymous" on server "ftp.tecgraf.puc-rio.br",
|
||||
-- and get file "lua.tar.gz" from directory "pub/lua" as binary.
|
||||
f, e = ftp.get("ftp://ftp.tecgraf.puc-rio.br/pub/lua/lua.tar.gz;type=i")
|
||||
</pre>
|
||||
|
||||
<pre class="example">
|
||||
-- load needed modules
|
||||
local ftp = require("socket.ftp")
|
||||
local ltn12 = require("ltn12")
|
||||
local url = require("socket.url")
|
||||
|
||||
-- a function that returns a directory listing
|
||||
function nlst(u)
|
||||
local t = {}
|
||||
local p = url.parse(u)
|
||||
p.command = "nlst"
|
||||
p.sink = ltn12.sink.table(t)
|
||||
local r, e = ftp.get(p)
|
||||
return r and table.concat(t), e
|
||||
end
|
||||
</pre>
|
||||
|
||||
<!-- put ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="put">
|
||||
ftp.<b>put(</b>url, content<b>)</b><br>
|
||||
ftp.<b>put{</b><br>
|
||||
host = <i>string</i>,<br>
|
||||
source = <i>LTN12 sink</i>,<br>
|
||||
argument <i>or</i> path = <i>string</i>,<br>
|
||||
[user = <i>string</i>,]<br>
|
||||
[password = <i>string</i>]<br>
|
||||
[command = <i>string</i>,]<br>
|
||||
[port = <i>number</i>,]<br>
|
||||
[type = <i>string</i>,]<br>
|
||||
[step = <i>LTN12 pump step</i>,]<br>
|
||||
[create = <i>function</i>]<br>
|
||||
<b>}</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
The <tt>put</tt> function has two forms. The simple form has fixed
|
||||
functionality: it uploads a string of content into a URL. The generic form
|
||||
allows a <em>lot</em> more control, as explained below.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
If the argument of the <tt>put</tt> function is a table, the function
|
||||
expects at least the fields <tt>host</tt>, <tt>source</tt>, and one of
|
||||
<tt>argument</tt> or <tt>path</tt> (<tt>argument</tt> takes
|
||||
precedence). <tt>Host</tt> is the server to connect to. <tt>Source</tt> is
|
||||
the <em>simple</em>
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
|
||||
source that will provide the contents to be uploaded.
|
||||
<tt>Argument</tt> or
|
||||
<tt>path</tt> give the target path to the resource in the server. The
|
||||
optional arguments are the following:
|
||||
</p>
|
||||
<ul>
|
||||
<li><tt>user</tt>, <tt>password</tt>: User name and password used for
|
||||
authentication. Defaults to "<tt>ftp:anonymous@anonymous.org</tt>";</li>
|
||||
<li><tt>command</tt>: The FTP command used to send data. Defaults to
|
||||
"<tt>stor</tt>", but see example below;</li>
|
||||
<li><tt>port</tt>: The port to used for the control connection. Defaults to 21;</li>
|
||||
<li><tt>type</tt>: The transfer mode. Can take values "<tt>i</tt>" or
|
||||
"<tt>a</tt>". Defaults to whatever is the server default;</li>
|
||||
<li><tt>step</tt>:
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
|
||||
pump step function used to pass data from the
|
||||
server to the sink. Defaults to the LTN12 <tt>pump.step</tt> function;</li>
|
||||
<li><tt>create</tt>: An optional function to be used instead of
|
||||
<a href="tcp.html#socket.tcp"><tt>socket.tcp</tt></a> when the communications socket is created.</li>
|
||||
</ul>
|
||||
|
||||
<p class="return">
|
||||
Both functions return 1 if successful, or <b><tt>nil</tt></b> and an error
|
||||
message describing the reason for failure.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- load the ftp support
|
||||
local ftp = require("socket.ftp")
|
||||
|
||||
-- Log as user "fulano" on server "ftp.example.com",
|
||||
-- using password "silva", and store a file "README" with contents
|
||||
-- "wrong password, of course"
|
||||
f, e = ftp.put("ftp://fulano:silva@ftp.example.com/README",
|
||||
"wrong password, of course")
|
||||
</pre>
|
||||
|
||||
<pre class="example">
|
||||
-- load the ftp support
|
||||
local ftp = require("socket.ftp")
|
||||
local ltn12 = require("ltn12")
|
||||
|
||||
-- Log as user "fulano" on server "ftp.example.com",
|
||||
-- using password "silva", and append to the remote file "LOG", sending the
|
||||
-- contents of the local file "LOCAL-LOG"
|
||||
f, e = ftp.put{
|
||||
host = "ftp.example.com",
|
||||
user = "fulano",
|
||||
password = "silva",
|
||||
command = "appe",
|
||||
argument = "LOG",
|
||||
source = ltn12.source.file(io.open("LOCAL-LOG", "r"))
|
||||
}
|
||||
</pre>
|
||||
|
||||
|
||||
<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="footer">
|
||||
<hr>
|
||||
<center>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
<p>
|
||||
<small>
|
||||
Last modified by Diego Nehab on <br>
|
||||
Thu Apr 20 00:25:18 EDT 2006
|
||||
</small>
|
||||
</p>
|
||||
</center>
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,339 @@
|
|||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
||||
"http://www.w3.org/TR/html4/strict.dtd">
|
||||
<html>
|
||||
|
||||
<head>
|
||||
<meta name="description" content="LuaSocket: HTTP support">
|
||||
<meta name="keywords" content="Lua, HTTP, Library, WWW, Browser, Network, Support">
|
||||
<title>LuaSocket: HTTP support</title>
|
||||
<link rel="stylesheet" href="reference.css" type="text/css">
|
||||
</head>
|
||||
|
||||
<body>
|
||||
|
||||
<!-- header ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="header">
|
||||
<hr>
|
||||
<center>
|
||||
<table summary="LuaSocket logo">
|
||||
<tr><td align="center"><a href="http://www.lua.org">
|
||||
<img width="128" height="128" border="0" alt="LuaSocket" src="luasocket.png">
|
||||
</a></td></tr>
|
||||
<tr><td align="center" valign="top">Network support for the Lua language
|
||||
</td></tr>
|
||||
</table>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
</center>
|
||||
<hr>
|
||||
</div>
|
||||
|
||||
<!-- http +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2 id="http">HTTP</h2>
|
||||
|
||||
<p>
|
||||
HTTP (Hyper Text Transfer Protocol) is the protocol used to exchange
|
||||
information between web-browsers and servers. The <tt>http</tt>
|
||||
namespace offers full support for the client side of the HTTP
|
||||
protocol (i.e.,
|
||||
the facilities that would be used by a web-browser implementation). The
|
||||
implementation conforms to the HTTP/1.1 standard,
|
||||
<a href="http://www.ietf.org/rfc/rfc2616.txt">RFC 2616</a>.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The module exports functions that provide HTTP functionality in different
|
||||
levels of abstraction. From the simple
|
||||
string oriented requests, through generic
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a> based, down to even lower-level if you bother to look through the source code.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
To obtain the <tt>http</tt> namespace, run:
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- loads the HTTP module and any libraries it requires
|
||||
local http = require("socket.http")
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
URLs must conform to
|
||||
<a href="http://www.ietf.org/rfc/rfc1738.txt">RFC 1738</a>,
|
||||
that is, an URL is a string in the form:
|
||||
</p>
|
||||
|
||||
<blockquote>
|
||||
<pre>
|
||||
[http://][<user>[:<password>]@]<host>[:<port>][/<path>]
|
||||
</pre>
|
||||
</blockquote>
|
||||
|
||||
<p>
|
||||
MIME headers are represented as a Lua table in the form:
|
||||
</p>
|
||||
|
||||
<blockquote>
|
||||
<table summary="MIME headers in Lua table">
|
||||
<tr><td><tt>
|
||||
headers = {<br>
|
||||
field-1-name = <i>field-1-value</i>,<br>
|
||||
field-2-name = <i>field-2-value</i>,<br>
|
||||
field-3-name = <i>field-3-value</i>,<br>
|
||||
...<br>
|
||||
field-n-name = <i>field-n-value</i><br>
|
||||
}
|
||||
</tt></td></tr>
|
||||
</table>
|
||||
</blockquote>
|
||||
|
||||
<p>
|
||||
Field names are case insensitive (as specified by the standard) and all
|
||||
functions work with lowercase field names (but see
|
||||
<a href="socket.html#headers.canonic"><tt>socket.headers.canonic</tt></a>).
|
||||
Field values are left unmodified.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: MIME headers are independent of order. Therefore, there is no problem
|
||||
in representing them in a Lua table.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The following constants can be set to control the default behavior of
|
||||
the HTTP module:
|
||||
</p>
|
||||
|
||||
<ul>
|
||||
<li> <tt>PROXY</tt>: default proxy used for connections;</li>
|
||||
<li> <tt>TIMEOUT</tt>: sets the timeout for all I/O operations;</li>
|
||||
<li> <tt>USERAGENT</tt>: default user agent reported to server.</li>
|
||||
</ul>
|
||||
|
||||
<p class="note">
|
||||
Note: These constants are global. Changing them will also
|
||||
change the behavior other code that might be using LuaSocket.
|
||||
</p>
|
||||
|
||||
<!-- http.request ++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="request">
|
||||
http.<b>request(</b>url [, body]<b>)</b><br>
|
||||
http.<b>request{</b><br>
|
||||
url = <i>string</i>,<br>
|
||||
[sink = <i>LTN12 sink</i>,]<br>
|
||||
[method = <i>string</i>,]<br>
|
||||
[headers = <i>header-table</i>,]<br>
|
||||
[source = <i>LTN12 source</i>],<br>
|
||||
[step = <i>LTN12 pump step</i>,]<br>
|
||||
[proxy = <i>string</i>,]<br>
|
||||
[redirect = <i>boolean</i>,]<br>
|
||||
[create = <i>function</i>,]<br>
|
||||
[maxredirects = <i>number</i>]<br>
|
||||
<b>}</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
The request function has two forms. The simple form downloads
|
||||
a URL using the <tt>GET</tt> or <tt>POST</tt> method and is based
|
||||
on strings. The generic form performs any HTTP method and is
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a> based.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
If the first argument of the <tt>request</tt> function is a string, it
|
||||
should be an <tt>url</tt>. In that case, if a <tt>body</tt>
|
||||
is provided as a string, the function will perform a <tt>POST</tt> method
|
||||
in the <tt>url</tt>. Otherwise, it performs a <tt>GET</tt> in the
|
||||
<tt>url</tt>
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
If the first argument is instead a table, the most important fields are
|
||||
the <tt>url</tt> and the <em>simple</em>
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
|
||||
<tt>sink</tt> that will receive the downloaded content.
|
||||
Any part of the <tt>url</tt> can be overridden by including
|
||||
the appropriate field in the request table.
|
||||
If authentication information is provided, the function
|
||||
uses the Basic Authentication Scheme (see <a href="#authentication">note</a>)
|
||||
to retrieve the document. If <tt>sink</tt> is <tt><b>nil</b></tt>, the
|
||||
function discards the downloaded data. The optional parameters are the
|
||||
following:
|
||||
</p>
|
||||
<ul>
|
||||
<li><tt>method</tt>: The HTTP request method. Defaults to "GET";</li>
|
||||
<li><tt>headers</tt>: Any additional HTTP headers to send with the request;</li>
|
||||
<li><tt>source</tt>: <em>simple</em>
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
|
||||
source to provide the request body. If there
|
||||
is a body, you need to provide an appropriate "<tt>content-length</tt>"
|
||||
request header field, or the function will attempt to send the body as
|
||||
"<tt>chunked</tt>" (something few servers support). Defaults to the empty source;</li>
|
||||
<li><tt>step</tt>:
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
|
||||
pump step function used to move data.
|
||||
Defaults to the LTN12 <tt>pump.step</tt> function.</li>
|
||||
<li><tt>proxy</tt>: The URL of a proxy server to use. Defaults to no proxy;</li>
|
||||
<li><tt>redirect</tt>: Set to <tt><b>false</b></tt> to prevent the
|
||||
function from automatically following 301 or 302 server redirect messages;</li>
|
||||
<li><tt>create</tt>: An optional function to be used instead of
|
||||
<a href="tcp.html#socket.tcp"><tt>socket.tcp</tt></a> when the communications socket is created.</li>
|
||||
<li><tt>maxredirects</tt>: An optional number specifying the maximum number of
|
||||
redirects to follow. Defaults to <tt>5</tt> if not specified. A boolean
|
||||
<tt>false</tt> value means no maximum (unlimited).</li>
|
||||
</ul>
|
||||
|
||||
<p class="return">
|
||||
In case of failure, the function returns <tt><b>nil</b></tt> followed by an
|
||||
error message. If successful, the simple form returns the response
|
||||
body as a string, followed by the response status code, the response
|
||||
headers and the response status line. The generic function returns the same
|
||||
information, except the first return value is just the number 1 (the body
|
||||
goes to the <tt>sink</tt>).
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
Even when the server fails to provide the contents of the requested URL (URL not found, for example),
|
||||
it usually returns a message body (a web page informing the
|
||||
URL was not found or some other useless page). To make sure the
|
||||
operation was successful, check the returned status <tt>code</tt>. For
|
||||
a list of the possible values and their meanings, refer to <a
|
||||
href="http://www.ietf.org/rfc/rfc2616.txt">RFC 2616</a>.
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Here are a few examples with the simple interface:
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- load the http module
|
||||
local io = require("io")
|
||||
local http = require("socket.http")
|
||||
local ltn12 = require("ltn12")
|
||||
|
||||
-- connect to server "www.cs.princeton.edu" and retrieves this manual
|
||||
-- file from "~diego/professional/luasocket/http.html" and print it to stdout
|
||||
http.request{
|
||||
url = "http://www.cs.princeton.edu/~diego/professional/luasocket/http.html",
|
||||
sink = ltn12.sink.file(io.stdout)
|
||||
}
|
||||
|
||||
-- connect to server "www.example.com" and tries to retrieve
|
||||
-- "/private/index.html". Fails because authentication is needed.
|
||||
b, c, h = http.request("http://www.example.com/private/index.html")
|
||||
-- b returns some useless page telling about the denied access,
|
||||
-- h returns authentication information
|
||||
-- and c returns with value 401 (Authentication Required)
|
||||
|
||||
-- tries to connect to server "wrong.host" to retrieve "/"
|
||||
-- and fails because the host does not exist.
|
||||
r, e = http.request("http://wrong.host/")
|
||||
-- r is nil, and e returns with value "host not found"
|
||||
</pre>
|
||||
|
||||
<p class="description">
|
||||
And here is an example using the generic interface:
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- load the http module
|
||||
http = require("socket.http")
|
||||
|
||||
-- Requests information about a document, without downloading it.
|
||||
-- Useful, for example, if you want to display a download gauge and need
|
||||
-- to know the size of the document in advance
|
||||
r, c, h = http.request {
|
||||
method = "HEAD",
|
||||
url = "http://www.tecgraf.puc-rio.br/~diego"
|
||||
}
|
||||
-- r is 1, c is 200, and h would return the following headers:
|
||||
-- h = {
|
||||
-- date = "Tue, 18 Sep 2001 20:42:21 GMT",
|
||||
-- server = "Apache/1.3.12 (Unix) (Red Hat/Linux)",
|
||||
-- ["last-modified"] = "Wed, 05 Sep 2001 06:11:20 GMT",
|
||||
-- ["content-length"] = 15652,
|
||||
-- ["connection"] = "close",
|
||||
-- ["content-Type"] = "text/html"
|
||||
-- }
|
||||
</pre>
|
||||
|
||||
<p class="note" id="post">
|
||||
Note: When sending a POST request, simple interface adds a
|
||||
"<tt>Content-type: application/x-www-form-urlencoded</tt>"
|
||||
header to the request. This is the type used by
|
||||
HTML forms. If you need another type, use the generic
|
||||
interface.
|
||||
</p>
|
||||
|
||||
<p class="note" id="authentication">
|
||||
Note: Some URLs are protected by their
|
||||
servers from anonymous download. For those URLs, the server must receive
|
||||
some sort of authentication along with the request or it will deny
|
||||
download and return status "401 Authentication Required".
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
The HTTP/1.1 standard defines two authentication methods: the Basic
|
||||
Authentication Scheme and the Digest Authentication Scheme, both
|
||||
explained in detail in
|
||||
<a href="http://www.ietf.org/rfc/rfc2068.txt">RFC 2068</a>.
|
||||
</p>
|
||||
|
||||
<p class="note">The Basic Authentication Scheme sends
|
||||
<tt><user></tt> and
|
||||
<tt><password></tt> unencrypted to the server and is therefore
|
||||
considered unsafe. Unfortunately, by the time of this implementation,
|
||||
the wide majority of servers and browsers support the Basic Scheme only.
|
||||
Therefore, this is the method used by the toolkit whenever
|
||||
authentication is required.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- load required modules
|
||||
http = require("socket.http")
|
||||
mime = require("mime")
|
||||
|
||||
-- Connect to server "www.example.com" and tries to retrieve
|
||||
-- "/private/index.html", using the provided name and password to
|
||||
-- authenticate the request
|
||||
b, c, h = http.request("http://fulano:silva@www.example.com/private/index.html")
|
||||
|
||||
-- Alternatively, one could fill the appropriate header and authenticate
|
||||
-- the request directly.
|
||||
r, c = http.request {
|
||||
url = "http://www.example.com/private/index.html",
|
||||
headers = { authorization = "Basic " .. (mime.b64("fulano:silva")) }
|
||||
}
|
||||
</pre>
|
||||
|
||||
<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="footer">
|
||||
<hr>
|
||||
<center>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
<p>
|
||||
<small>
|
||||
Last modified by Eric Westbrook on <br>
|
||||
Sat Feb 23 19:09:42 UTC 2019
|
||||
</small>
|
||||
</p>
|
||||
</center>
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,138 @@
|
|||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
||||
"http://www.w3.org/TR/html4/strict.dtd">
|
||||
<html>
|
||||
|
||||
<head>
|
||||
<meta name="description" content="The LuaSocket Homepage">
|
||||
<meta name="keywords" content="Lua, LuaSocket, Network, Library, Support, Internet">
|
||||
<title>LuaSocket: Network support for the Lua language </title>
|
||||
<link rel="stylesheet" href="reference.css" type="text/css">
|
||||
</head>
|
||||
|
||||
<body>
|
||||
|
||||
<!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="header">
|
||||
<hr>
|
||||
<center>
|
||||
<table summary="LuaSocket logo">
|
||||
<tr><td align="center"><a href="http://www.lua.org">
|
||||
<img width="128" height="128" border="0" alt="LuaSocket" src="luasocket.png">
|
||||
</a></td></tr>
|
||||
<tr><td align="center" valign="top">Network support for the Lua language
|
||||
</td></tr>
|
||||
</table>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
</center>
|
||||
<hr>
|
||||
</div>
|
||||
|
||||
<!-- whatis +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2 id="whatis">What is LuaSocket?</h2>
|
||||
|
||||
<p>
|
||||
LuaSocket is a <a href="http://www.lua.org">Lua</a> extension library
|
||||
that is composed by two parts: a C core that provides support for the TCP
|
||||
and UDP transport layers, and a set of Lua modules that add support for
|
||||
functionality commonly needed by applications that deal with the Internet.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The core support has been implemented so that it is both efficient and
|
||||
simple to use. It is available to any Lua application once it has been
|
||||
properly initialized by the interpreter in use. The code has been tested
|
||||
and runs well on several Windows and UNIX platforms. </p>
|
||||
|
||||
<p>
|
||||
Among the support modules, the most commonly used implement the
|
||||
<a href="smtp.html">SMTP</a>
|
||||
(sending e-mails),
|
||||
<a href="http.html">HTTP</a>
|
||||
(WWW access) and
|
||||
<a href="ftp.html">FTP</a>
|
||||
(uploading and downloading files) client
|
||||
protocols. These provide a very natural and generic interface to the
|
||||
functionality defined by each protocol.
|
||||
In addition, you will find that the
|
||||
<a href="mime.html">MIME</a> (common encodings),
|
||||
<a href="url.html">URL</a>
|
||||
(anything you could possible want to do with one) and
|
||||
<a href="ltn12.html">LTN12</a>
|
||||
(filters, sinks, sources and pumps) modules can be very handy.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The library is available under the same
|
||||
<a href="http://www.lua.org/copyright.html">
|
||||
terms and conditions</a> as the Lua language, the MIT license. The idea is
|
||||
that if you can use Lua in a project, you should also be able to use
|
||||
LuaSocket.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Copyright © 1999-2013 Diego Nehab. All rights reserved. <br>
|
||||
Author: <a href="http://www.impa.br/~diego">Diego Nehab</a>
|
||||
</p>
|
||||
|
||||
<!-- download +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2 id="download">Download</h2>
|
||||
|
||||
<p>
|
||||
LuaSocket version 3.1.0 is now available for download!
|
||||
It is compatible with Lua 5.1 through 5.4.
|
||||
Chances are it works well on most UNIX distributions and Windows flavors.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The current version of the library can be found at
|
||||
the <a href="https://github.com/lunarmodules/luasocket">LuaSocket
|
||||
project page</a> on GitHub. Besides the full C and Lua source code
|
||||
for the library, the distribution contains several examples,
|
||||
this user's manual and basic test procedures.
|
||||
</p>
|
||||
|
||||
<p> Take a look at the <a
|
||||
href="installation.html">installation</a> section of the
|
||||
manual to find out how to properly install the library.
|
||||
</p>
|
||||
|
||||
<!-- thanks +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2 id="thanks">Special thanks</h2>
|
||||
|
||||
<p>
|
||||
This marks the first release of LuaSocket that
|
||||
wholeheartedly embraces the open-source development
|
||||
philosophy. After a long hiatus, Matthew Wild finally
|
||||
convinced me it was time for a release including IPv6 and
|
||||
Lua 5.2 support. It was more work than we anticipated.
|
||||
Special thanks to Sam Roberts, Florian Zeitz, and Paul
|
||||
Aurich, Liam Devine, Alexey Melnichuk, and everybody else
|
||||
that has helped bring this library back to life.
|
||||
</p>
|
||||
|
||||
<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="footer">
|
||||
<hr>
|
||||
<center>
|
||||
<p class="bar">
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
</center>
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,127 @@
|
|||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
||||
"http://www.w3.org/TR/html4/strict.dtd">
|
||||
<html>
|
||||
|
||||
<head>
|
||||
<meta name="description" content="LuaSocket: Introduction to the core">
|
||||
<meta name="keywords" content="Lua, LuaSocket, TCP, UDP, Network, Support,
|
||||
Installation">
|
||||
<title>LuaSocket: Installation</title>
|
||||
<link rel="stylesheet" href="reference.css" type="text/css">
|
||||
</head>
|
||||
|
||||
<body>
|
||||
|
||||
<!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class=header>
|
||||
<hr>
|
||||
<center>
|
||||
<table summary="LuaSocket logo">
|
||||
<tr><td align=center><a href="http://www.lua.org">
|
||||
<img width=128 height=128 border=0 alt="LuaSocket" src="luasocket.png">
|
||||
</a></td></tr>
|
||||
<tr><td align=center valign=top>Network support for the Lua language
|
||||
</td></tr>
|
||||
</table>
|
||||
<p class=bar>
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
</center>
|
||||
<hr>
|
||||
</div>
|
||||
|
||||
<!-- installation ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2>Installation</h2>
|
||||
|
||||
<p> Here we describe the standard distribution. If the
|
||||
standard doesn't meet your needs, we refer you to the Lua
|
||||
discussion list, where any question about the package scheme
|
||||
will likely already have been answered. </p>
|
||||
|
||||
<h3>Directory structure</h3>
|
||||
|
||||
<p> On Unix systems, the standard distribution uses two base
|
||||
directories, one for system dependent files, and another for system
|
||||
independent files. Let's call these directories <tt><CDIR></tt>
|
||||
and <tt><LDIR></tt>, respectively.
|
||||
For example, in my laptp, Lua 5.1 is configured to
|
||||
use '<tt>/usr/local/lib/lua/5.1</tt>' for
|
||||
<tt><CDIR></tt> and '<tt>/usr/local/share/lua/5.1</tt>' for
|
||||
<tt><LDIR></tt>. On Windows, <tt><CDIR></tt>
|
||||
usually points to the directory where the Lua executable is
|
||||
found, and <tt><LDIR></tt> points to a
|
||||
<tt>lua/</tt> directory inside <tt><CDIR></tt>. (These
|
||||
settings can be overridden by environment variables
|
||||
<tt>LUA_PATH</tt> and <tt>LUA_CPATH</tt>. See the Lua
|
||||
documentation for details.) Here is the standard LuaSocket
|
||||
distribution directory structure:</p>
|
||||
|
||||
<pre class=example>
|
||||
<LDIR>/ltn12.lua
|
||||
<LDIR>/socket.lua
|
||||
<CDIR>/socket/core.dll
|
||||
<LDIR>/socket/http.lua
|
||||
<LDIR>/socket/tp.lua
|
||||
<LDIR>/socket/ftp.lua
|
||||
<LDIR>/socket/smtp.lua
|
||||
<LDIR>/socket/url.lua
|
||||
<LDIR>/mime.lua
|
||||
<CDIR>/mime/core.dll
|
||||
</pre>
|
||||
|
||||
<p> Naturally, on Unix systems, <tt>core.dll</tt>
|
||||
would be replaced by <tt>core.so</tt>.
|
||||
</p>
|
||||
|
||||
<h3>Using LuaSocket</h3>
|
||||
|
||||
<p> With the above setup, and an interpreter with shared library support,
|
||||
it should be easy to use LuaSocket. Just fire the interpreter and use the
|
||||
<tt>require</tt> function to gain access to whatever module you need:</p>
|
||||
|
||||
<pre class=example>
|
||||
Lua 5.2.2 Copyright (C) 1994-2013 Lua.org, PUC-Rio
|
||||
> socket = require("socket")
|
||||
> print(socket._VERSION)
|
||||
--> LuaSocket 3.0.0
|
||||
</pre>
|
||||
|
||||
<p> Each module loads their dependencies automatically, so you only need to
|
||||
load the modules you directly depend upon: </p>
|
||||
|
||||
<pre class=example>
|
||||
Lua 5.2.2 Copyright (C) 1994-2013 Lua.org, PUC-Rio
|
||||
> http = require("socket.http")
|
||||
> print(http.request("http://www.impa.br/~diego/software/luasocket"))
|
||||
--> homepage gets dumped to terminal
|
||||
</pre>
|
||||
|
||||
<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class=footer>
|
||||
<hr>
|
||||
<center>
|
||||
<p class=bar>
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#down">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
<p>
|
||||
<small>
|
||||
Last modified by Diego Nehab on <br>
|
||||
Tue Jun 11 19:06:14 HKT 2013
|
||||
</small>
|
||||
</p>
|
||||
</center>
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,333 @@
|
|||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
||||
"http://www.w3.org/TR/html4/strict.dtd">
|
||||
<html>
|
||||
|
||||
<head>
|
||||
<meta name="description" content="LuaSocket: Introduction to the core">
|
||||
<meta name="keywords" content="Lua, LuaSocket, TCP, UDP, Network,
|
||||
Library, Support">
|
||||
<title>LuaSocket: Introduction to the core</title>
|
||||
<link rel="stylesheet" href="reference.css" type="text/css">
|
||||
</head>
|
||||
|
||||
<body>
|
||||
|
||||
<!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class=header>
|
||||
<hr>
|
||||
<center>
|
||||
<table summary="LuaSocket logo">
|
||||
<tr><td align=center><a href="http://www.lua.org">
|
||||
<img width=128 height=128 border=0 alt="LuaSocket" src="luasocket.png">
|
||||
</a></td></tr>
|
||||
<tr><td align=center valign=top>Network support for the Lua language
|
||||
</td></tr>
|
||||
</table>
|
||||
<p class=bar>
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
</center>
|
||||
<hr>
|
||||
</div>
|
||||
|
||||
<!-- introduction +++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2>Introduction</h2>
|
||||
|
||||
<p>
|
||||
LuaSocket is a <a href="http://www.lua.org">Lua</a> extension library
|
||||
that is composed by two parts: a C core that provides support for the TCP
|
||||
and UDP transport layers, and a set of Lua modules that add support for
|
||||
the SMTP (sending e-mails), HTTP (WWW access) and FTP (uploading and
|
||||
downloading files) protocols and other functionality commonly needed by
|
||||
applications that deal with the Internet. This introduction is about the C
|
||||
core.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Communication in LuaSocket is performed via I/O objects. These can
|
||||
represent different network domains. Currently, support is provided for TCP
|
||||
and UDP, but nothing prevents other developers from implementing SSL, Local
|
||||
Domain, Pipes, File Descriptors etc. I/O objects provide a standard
|
||||
interface to I/O across different domains and operating systems.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The API design had two goals in mind. First, users
|
||||
experienced with the C API to sockets should feel comfortable using LuaSocket.
|
||||
Second, the simplicity and the feel of the Lua language should be
|
||||
preserved. To achieve these goals, the LuaSocket API keeps the function names and semantics the C API whenever possible, but their usage in Lua has been greatly simplified.
|
||||
</p>
|
||||
|
||||
|
||||
<p>
|
||||
One of the simplifications is the receive pattern capability.
|
||||
Applications can read data from stream domains (such as TCP)
|
||||
line by line, block by block, or until the connection is closed.
|
||||
All I/O reads are buffered and the performance differences between
|
||||
different receive patterns are negligible.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Another advantage is the flexible timeout control
|
||||
mechanism. As in C, all I/O operations are blocking by default. For
|
||||
example, the <a href=tcp.html#send><tt>send</tt></a>,
|
||||
<a href=tcp.html#receive><tt>receive</tt></a> and
|
||||
<a href=tcp.html#accept><tt>accept</tt></a> methods
|
||||
of the TCP domain will block the caller application until
|
||||
the operation is completed (if ever!). However, with a call to the
|
||||
<a href=tcp.html#settimeout><tt>settimeout</tt></a>
|
||||
method, an application can specify upper limits on
|
||||
the time it can be blocked by LuaSocket (the "<tt>total</tt>" timeout), on
|
||||
the time LuaSocket can internally be blocked by any OS call (the
|
||||
"<tt>block</tt>" timeout) or a combination of the two. Each LuaSocket
|
||||
call might perform several OS calls, so that the two timeout values are
|
||||
<em>not</em> equivalent.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Finally, the host name resolution is transparent, meaning that most
|
||||
functions and methods accept both IP addresses and host names. In case a
|
||||
host name is given, the library queries the system's resolver and
|
||||
tries the main IP address returned. Note that direct use of IP addresses
|
||||
is more efficient, of course. The
|
||||
<a href=dns.html#toip><tt>toip</tt></a>
|
||||
and <a href=dns.html#tohostname><tt>tohostname</tt></a>
|
||||
functions from the DNS module are provided to convert between host names and IP addresses.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Together, these changes make network programming in LuaSocket much simpler
|
||||
than it is in C, as the following sections will show.
|
||||
</p>
|
||||
|
||||
<!-- tcp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h3 id=tcp>TCP</h3>
|
||||
|
||||
<p>
|
||||
TCP (Transfer Control Protocol) is reliable stream protocol. In other
|
||||
words, applications communicating through TCP can send and receive data as
|
||||
an error free stream of bytes. Data is split in one end and
|
||||
reassembled transparently on the other end. There are no boundaries in
|
||||
the data transfers. The library allows users to read data from the
|
||||
sockets in several different granularities: patterns are available for
|
||||
lines, arbitrary sized blocks or "read up to connection closed", all with
|
||||
good performance.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The library distinguishes three types of TCP sockets: <em>master</em>,
|
||||
<em>client</em> and <em>server</em> sockets.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Master sockets are newly created TCP sockets returned by the function
|
||||
<a href=tcp.html#tcp><tt>socket.tcp</tt></a>. A master socket is
|
||||
transformed into a server socket
|
||||
after it is associated with a <em>local</em> address by a call to the
|
||||
<a href=tcp.html#bind><tt>bind</tt></a> method followed by a call to the
|
||||
<a href=tcp.html#listen><tt>listen</tt></a>. Conversely, a master socket
|
||||
can be changed into a client socket with the method
|
||||
<a href=tcp.html#connect><tt>connect</tt></a>,
|
||||
which associates it with a <em>remote</em> address.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
On server sockets, applications can use the
|
||||
<a href=tcp.html#accept><tt>accept</tt></a> method
|
||||
to wait for a client connection. Once a connection is established, a
|
||||
client socket object is returned representing this connection. The
|
||||
other methods available for server socket objects are
|
||||
<a href=tcp.html#getsockname><tt>getsockname</tt></a>,
|
||||
<a href=tcp.html#setoption><tt>setoption</tt></a>,
|
||||
<a href=tcp.html#settimeout><tt>settimeout</tt></a>, and
|
||||
<a href=tcp.html#close><tt>close</tt></a>.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Client sockets are used to exchange data between two applications over
|
||||
the Internet. Applications can call the methods
|
||||
<a href=tcp.html#send><tt>send</tt></a> and
|
||||
<a href=tcp.html#receive><tt>receive</tt></a>
|
||||
to send and receive data. The other methods
|
||||
available for client socket objects are
|
||||
<a href=tcp.html#getsockname><tt>getsockname</tt></a>,
|
||||
<a href=tcp.html#getpeername><tt>getpeername</tt></a>,
|
||||
<a href=tcp.html#setoption><tt>setoption</tt></a>,
|
||||
<a href=tcp.html#settimeout><tt>settimeout</tt></a>,
|
||||
<a href=tcp.html#shutdown><tt>shutdown</tt></a>, and
|
||||
<a href=tcp.html#close><tt>close</tt></a>.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Example:
|
||||
</p>
|
||||
<blockquote>
|
||||
<p>
|
||||
A simple echo server, using LuaSocket. The program binds to an ephemeral
|
||||
port (one that is chosen by the operating system) on the local host and
|
||||
awaits client connections on that port. When a connection is established,
|
||||
the program reads a line from the remote end and sends it back, closing
|
||||
the connection immediately. You can test it using the telnet
|
||||
program.
|
||||
</p>
|
||||
|
||||
<pre class=example>
|
||||
-- load namespace
|
||||
local socket = require("socket")
|
||||
-- create a TCP socket and bind it to the local host, at any port
|
||||
local server = assert(socket.bind("*", 0))
|
||||
-- find out which port the OS chose for us
|
||||
local ip, port = server:getsockname()
|
||||
-- print a message informing what's up
|
||||
print("Please telnet to localhost on port " .. port)
|
||||
print("After connecting, you have 10s to enter a line to be echoed")
|
||||
-- loop forever waiting for clients
|
||||
while 1 do
|
||||
-- wait for a connection from any client
|
||||
local client = server:accept()
|
||||
-- make sure we don't block waiting for this client's line
|
||||
client:settimeout(10)
|
||||
-- receive the line
|
||||
local line, err = client:receive()
|
||||
-- if there was no error, send it back to the client
|
||||
if not err then client:send(line .. "\n") end
|
||||
-- done with client, close the object
|
||||
client:close()
|
||||
end
|
||||
</pre>
|
||||
</blockquote>
|
||||
|
||||
<!-- udp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h3 id=udp>UDP</h3>
|
||||
|
||||
<p>
|
||||
UDP (User Datagram Protocol) is a non-reliable datagram protocol. In
|
||||
other words, applications communicating through UDP send and receive
|
||||
data as independent blocks, which are not guaranteed to reach the other
|
||||
end. Even when they do reach the other end, they are not guaranteed to be
|
||||
error free. Data transfers are atomic, one datagram at a time. Reading
|
||||
only part of a datagram discards the rest, so that the following read
|
||||
operation will act on the next datagram. The advantages are in
|
||||
simplicity (no connection setup) and performance (no error checking or
|
||||
error correction).
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Note that although no guarantees are made, these days
|
||||
networks are so good that, under normal circumstances, few errors
|
||||
happen in practice.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
An UDP socket object is created by the
|
||||
<a href=udp.html#udp><tt>socket.udp</tt></a> function. UDP
|
||||
sockets do not need to be connected before use. The method
|
||||
<a href=udp.html#sendto><tt>sendto</tt></a>
|
||||
can be used immediately after creation to
|
||||
send a datagram to IP address and port. Host names are not allowed
|
||||
because performing name resolution for each packet would be forbiddingly
|
||||
slow. Methods
|
||||
<a href=udp.html#receive><tt>receive</tt></a> and
|
||||
<a href=udp.html#receivefrom><tt>receivefrom</tt></a>
|
||||
can be used to retrieve datagrams, the latter returning the IP and port of
|
||||
the sender as extra return values (thus being slightly less
|
||||
efficient).
|
||||
</p>
|
||||
|
||||
<p>
|
||||
When communication is performed repeatedly with a single peer, an
|
||||
application should call the
|
||||
<a href=udp.html#setpeername><tt>setpeername</tt></a> method to specify a
|
||||
permanent partner. Methods
|
||||
<a href=udp.html#sendto><tt>sendto</tt></a> and
|
||||
<a href=udp.html#receivefrom><tt>receivefrom</tt></a>
|
||||
can no longer be used, but the method
|
||||
<a href=udp.html#send><tt>send</tt></a> can be used to send data
|
||||
directly to the peer, and the method
|
||||
<a href=udp.html#receive><tt>receive</tt></a>
|
||||
will only return datagrams originating
|
||||
from that peer. There is about 30% performance gain due to this practice.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
To associate an UDP socket with a local address, an application calls the
|
||||
<a href=udp.html#setsockname><tt>setsockname</tt></a>
|
||||
method <em>before</em> sending any datagrams. Otherwise, the socket is
|
||||
automatically bound to an ephemeral address before the first data
|
||||
transmission and once bound the local address cannot be changed.
|
||||
The other methods available for UDP sockets are
|
||||
<a href=udp.html#getpeername><tt>getpeername</tt></a>,
|
||||
<a href=udp.html#getsockname><tt>getsockname</tt></a>,
|
||||
<a href=udp.html#settimeout><tt>settimeout</tt></a>,
|
||||
<a href=udp.html#setoption><tt>setoption</tt></a> and
|
||||
<a href=udp.html#close><tt>close</tt></a>.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Example:
|
||||
</p>
|
||||
<blockquote>
|
||||
<p>
|
||||
A simple daytime client, using LuaSocket. The program connects to a remote
|
||||
server and tries to retrieve the daytime, printing the answer it got or an
|
||||
error message.
|
||||
</p>
|
||||
|
||||
<pre class=example>
|
||||
-- change here to the host an port you want to contact
|
||||
local host, port = "localhost", 13
|
||||
-- load namespace
|
||||
local socket = require("socket")
|
||||
-- convert host name to ip address
|
||||
local ip = assert(socket.dns.toip(host))
|
||||
-- create a new UDP object
|
||||
local udp = assert(socket.udp())
|
||||
-- contact daytime host
|
||||
assert(udp:sendto("anything", ip, port))
|
||||
-- retrieve the answer and print results
|
||||
io.write(assert(udp:receive()))
|
||||
</pre>
|
||||
</blockquote>
|
||||
|
||||
<!-- More +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h3 id=more>Support modules</h3>
|
||||
|
||||
<p> Although not covered in the introduction, LuaSocket offers
|
||||
much more than TCP and UDP functionality. As the library
|
||||
evolved, support for <a href=http.html>HTTP</a>, <a href=ftp.html>FTP</a>,
|
||||
and <a href=smtp.html>SMTP</a> were built on top of these. These modules
|
||||
and many others are covered by the <a href=reference.html>reference manual</a>.
|
||||
</p>
|
||||
|
||||
<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class=footer>
|
||||
<hr>
|
||||
<center>
|
||||
<p class=bar>
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#down">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
<p>
|
||||
<small>
|
||||
Last modified by Diego Nehab on <br>
|
||||
Thu Apr 20 00:25:36 EDT 2006
|
||||
</small>
|
||||
</p>
|
||||
</center>
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,440 @@
|
|||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
||||
"http://www.w3.org/TR/html4/strict.dtd">
|
||||
<html>
|
||||
|
||||
<head>
|
||||
<meta name="description" content="LuaSocket: LTN12 support">
|
||||
<meta name="keywords" content="Lua, LuaSocket, Filters, Source, Sink,
|
||||
Pump, Support, Library">
|
||||
<title>LuaSocket: LTN12 module</title>
|
||||
<link rel="stylesheet" href="reference.css" type="text/css">
|
||||
</head>
|
||||
|
||||
<body>
|
||||
|
||||
<!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="header">
|
||||
<hr>
|
||||
<center>
|
||||
<table summary="LuaSocket logo">
|
||||
<tr><td align="center"><a href="http://www.lua.org">
|
||||
<img width="128" height="128" border="0" alt="LuaSocket" src="luasocket.png">
|
||||
</a></td></tr>
|
||||
<tr><td align="center" valign="top">Network support for the Lua language
|
||||
</td></tr>
|
||||
</table>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
</center>
|
||||
<hr>
|
||||
</div>
|
||||
|
||||
<!-- ltn12 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2 id="ltn12">LTN12</h2>
|
||||
|
||||
<p> The <tt>ltn12</tt> namespace implements the ideas described in
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">
|
||||
LTN012, Filters sources and sinks</a>. This manual simply describes the
|
||||
functions. Please refer to the LTN for a deeper explanation of the
|
||||
functionality provided by this module.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
To obtain the <tt>ltn12</tt> namespace, run:
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- loads the LTN21 module
|
||||
local ltn12 = require("ltn12")
|
||||
</pre>
|
||||
|
||||
<!-- filters ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h3 id="filter">Filters</h3>
|
||||
|
||||
<!-- chain ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="filter.chain">
|
||||
ltn12.filter.<b>chain(</b>filter<sub>1</sub>, filter<sub>2</sub>
|
||||
[, ... filter<sub>N</sub>]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns a filter that passes all data it receives through each of a
|
||||
series of given filters.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Filter<sub>1</sub></tt> to <tt>filter<sub>N</sub></tt> are simple
|
||||
filters.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns the chained filter.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
The nesting of filters can be arbitrary. For instance, the useless filter
|
||||
below doesn't do anything but return the data that was passed to it,
|
||||
unaltered.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- load required modules
|
||||
local ltn12 = require("ltn12")
|
||||
local mime = require("mime")
|
||||
|
||||
-- create a silly identity filter
|
||||
id = ltn12.filter.chain(
|
||||
mime.encode("quoted-printable"),
|
||||
mime.encode("base64"),
|
||||
mime.decode("base64"),
|
||||
mime.decode("quoted-printable")
|
||||
)
|
||||
</pre>
|
||||
|
||||
<!-- cycle ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="filter.cycle">
|
||||
ltn12.filter.<b>cycle(</b>low [, ctx, extra]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns a high-level filter that cycles though a low-level filter by
|
||||
passing it each chunk and updating a context between calls.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Low</tt> is the low-level filter to be cycled,
|
||||
<tt>ctx</tt> is the initial context and <tt>extra</tt> is any extra
|
||||
argument the low-level filter might take.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns the high-level filter.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- load the ltn12 module
|
||||
local ltn12 = require("ltn12")
|
||||
|
||||
-- the base64 mime filter factory
|
||||
encodet['base64'] = function()
|
||||
return ltn12.filter.cycle(b64, "")
|
||||
end
|
||||
</pre>
|
||||
|
||||
<!-- pumps ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h3 id="pump">Pumps</h3>
|
||||
|
||||
<!-- all ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="pump.all">
|
||||
ltn12.pump.<b>all(</b>source, sink<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Pumps <em>all</em> data from a <tt>source</tt> to a <tt>sink</tt>.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
If successful, the function returns a value that evaluates to
|
||||
<b><tt>true</tt></b>. In case
|
||||
of error, the function returns a <b><tt>false</tt></b> value, followed by an error message.
|
||||
</p>
|
||||
|
||||
<!-- step +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="pump.step">
|
||||
ltn12.pump.<b>step(</b>source, sink<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Pumps <em>one</em> chunk of data from a <tt>source</tt> to a <tt>sink</tt>.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
If successful, the function returns a value that evaluates to
|
||||
<b><tt>true</tt></b>. In case
|
||||
of error, the function returns a <b><tt>false</tt></b> value, followed by an error message.
|
||||
</p>
|
||||
|
||||
<!-- sinks ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h3 id="sink">Sinks</h3>
|
||||
|
||||
<!-- chain ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="sink.chain">
|
||||
ltn12.sink.<b>chain(</b>filter, sink<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns a new sink that passes data through a <tt>filter</tt> before sending it to a given <tt>sink</tt>.
|
||||
</p>
|
||||
|
||||
<!-- error ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="sink.error">
|
||||
ltn12.sink.<b>error(</b>message<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns a sink that aborts transmission with the error
|
||||
<tt>message</tt>.
|
||||
</p>
|
||||
|
||||
<!-- file +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="sink.file">
|
||||
ltn12.sink.<b>file(</b>handle, message<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates a sink that sends data to a file.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Handle</tt> is a file handle. If <tt>handle</tt> is <tt><b>nil</b></tt>,
|
||||
<tt>message</tt> should give the reason for failure.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns a sink that sends all data to the given <tt>handle</tt>
|
||||
and closes the file when done, or a sink that aborts the transmission with
|
||||
the error <tt>message</tt>
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
In the following example, notice how the prototype is designed to
|
||||
fit nicely with the <tt>io.open</tt> function.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- load the ltn12 module
|
||||
local ltn12 = require("ltn12")
|
||||
|
||||
-- copy a file
|
||||
ltn12.pump.all(
|
||||
ltn12.source.file(io.open("original.png", "rb")),
|
||||
ltn12.sink.file(io.open("copy.png", "wb"))
|
||||
)
|
||||
</pre>
|
||||
|
||||
<!-- null +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="sink.null">
|
||||
ltn12.sink.<b>null()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns a sink that ignores all data it receives.
|
||||
</p>
|
||||
|
||||
<!-- simplify +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="sink.simplify">
|
||||
ltn12.sink.<b>simplify(</b>sink<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns a simple sink given a fancy <tt>sink</tt>.
|
||||
</p>
|
||||
|
||||
<!-- table ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="sink.table">
|
||||
ltn12.sink.<b>table(</b>[table]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates a sink that stores all chunks in a table. The chunks can later be
|
||||
efficiently concatenated into a single string.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Table</tt> is used to hold the chunks. If
|
||||
<tt><b>nil</b></tt>, the function creates its own table.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns the sink and the table used to store the chunks.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- load needed modules
|
||||
local http = require("socket.http")
|
||||
local ltn12 = require("ltn12")
|
||||
|
||||
-- a simplified http.get function
|
||||
function http.get(u)
|
||||
local t = {}
|
||||
local respt = request{
|
||||
url = u,
|
||||
sink = ltn12.sink.table(t)
|
||||
}
|
||||
return table.concat(t), respt.headers, respt.code
|
||||
end
|
||||
</pre>
|
||||
|
||||
<!-- sinks ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h3 id="source">Sources</h3>
|
||||
|
||||
<!-- cat ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="source.cat">
|
||||
ltn12.source.<b>cat(</b>source<sub>1</sub> [, source<sub>2</sub>, ...,
|
||||
source<sub>N</sub>]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates a new source that produces the concatenation of the data produced
|
||||
by a number of sources.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Source<sub>1</sub></tt> to <tt>source<sub>N</sub></tt> are the original
|
||||
sources.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns the new source.
|
||||
</p>
|
||||
|
||||
<!-- chain ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="source.chain">
|
||||
ltn12.source.<b>chain(</b>source, filter<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates a new <tt>source</tt> that passes data through a <tt>filter</tt>
|
||||
before returning it.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns the new source.
|
||||
</p>
|
||||
|
||||
<!-- empty ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="source.empty">
|
||||
ltn12.source.<b>empty()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns an empty source.
|
||||
</p>
|
||||
|
||||
<!-- error ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="source.error">
|
||||
ltn12.source.<b>error(</b>message<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns a source that aborts transmission with the error
|
||||
<tt>message</tt>.
|
||||
</p>
|
||||
|
||||
<!-- file +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="source.file">
|
||||
ltn12.source.<b>file(</b>handle, message<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates a source that produces the contents of a file.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Handle</tt> is a file handle. If <tt>handle</tt> is <tt><b>nil</b></tt>,
|
||||
<tt>message</tt> should give the reason for failure.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns a source that reads chunks of data from
|
||||
given <tt>handle</tt> and returns it to the user,
|
||||
closing the file when done, or a source that aborts the transmission with
|
||||
the error <tt>message</tt>
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
In the following example, notice how the prototype is designed to
|
||||
fit nicely with the <tt>io.open</tt> function.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- load the ltn12 module
|
||||
local ltn12 = require("ltn12")
|
||||
|
||||
-- copy a file
|
||||
ltn12.pump.all(
|
||||
ltn12.source.file(io.open("original.png", "rb")),
|
||||
ltn12.sink.file(io.open("copy.png", "wb"))
|
||||
)
|
||||
</pre>
|
||||
|
||||
<!-- simplify +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="source.simplify">
|
||||
ltn12.source.<b>simplify(</b>source<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns a simple source given a fancy <tt>source</tt>.
|
||||
</p>
|
||||
|
||||
<!-- string +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="source.string">
|
||||
ltn12.source.<b>string(</b>string<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns a source that produces the contents of a
|
||||
<tt>string</tt>, chunk by chunk.
|
||||
</p>
|
||||
|
||||
<!-- table +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="source.table">
|
||||
ltn12.source.<b>table(</b>table<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns a source that produces the numerically-indexed values of a <tt>table</tt> successively beginning at 1. The source returns nil (end-of-stream) whenever a nil value is produced by the current index, which proceeds forward regardless.
|
||||
</p>
|
||||
|
||||
<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="footer">
|
||||
<hr>
|
||||
<center>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#down">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
<p>
|
||||
<small>
|
||||
Last modified by Diego Nehab on <br>
|
||||
Thu Apr 20 00:25:41 EDT 2006
|
||||
</small>
|
||||
</p>
|
||||
</center>
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
Binary file not shown.
Binary file not shown.
|
After Width: | Height: | Size: 12 KiB |
|
|
@ -0,0 +1,477 @@
|
|||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
||||
"http://www.w3.org/TR/html4/strict.dtd">
|
||||
<html>
|
||||
|
||||
<head>
|
||||
<meta name="description" content="LuaSocket: MIME support">
|
||||
<meta name="keywords" content="Lua, LuaSocket, MIME, Library, Support">
|
||||
<title>LuaSocket: MIME module</title>
|
||||
<link rel="stylesheet" href="reference.css" type="text/css">
|
||||
</head>
|
||||
|
||||
<body>
|
||||
|
||||
<!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="header">
|
||||
<hr>
|
||||
<center>
|
||||
<table summary="LuaSocket logo">
|
||||
<tr><td align="center"><a href="http://www.lua.org">
|
||||
<img width="128" height="128" border="0" alt="LuaSocket" src="luasocket.png">
|
||||
</a></td></tr>
|
||||
<tr><td align="center" valign="top">Network support for the Lua language
|
||||
</td></tr>
|
||||
</table>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
</center>
|
||||
<hr>
|
||||
</div>
|
||||
|
||||
<!-- mime +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2 id="mime">MIME</h2>
|
||||
|
||||
<p>
|
||||
The <tt>mime</tt> namespace offers filters that apply and remove common
|
||||
content transfer encodings, such as Base64 and Quoted-Printable.
|
||||
It also provides functions to break text into lines and change
|
||||
the end-of-line convention.
|
||||
MIME is described mainly in
|
||||
<a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>,
|
||||
<a href="http://www.ietf.org/rfc/rfc2046.txt">2046</a>,
|
||||
<a href="http://www.ietf.org/rfc/rfc2047.txt">2047</a>,
|
||||
<a href="http://www.ietf.org/rfc/rfc2047.txt">2048</a>, and
|
||||
<a href="http://www.ietf.org/rfc/rfc2048.txt">2049</a>.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
All functionality provided by the MIME module
|
||||
follows the ideas presented in
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">
|
||||
LTN012, Filters sources and sinks</a>.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
To obtain the <tt>mime</tt> namespace, run:
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- loads the MIME module and everything it requires
|
||||
local mime = require("mime")
|
||||
</pre>
|
||||
|
||||
|
||||
<!-- High-level +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h3 id="high">High-level filters</h3>
|
||||
|
||||
|
||||
<!-- decode +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="decode">
|
||||
mime.<b>decode(</b>"base64"<b>)</b><br>
|
||||
mime.<b>decode(</b>"quoted-printable"<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns a filter that decodes data from a given transfer content
|
||||
encoding.
|
||||
</p>
|
||||
|
||||
<!-- encode +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="encode">
|
||||
mime.<b>encode(</b>"base64"<b>)</b><br>
|
||||
mime.<b>encode(</b>"quoted-printable" [, mode]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns a filter that encodes data according to a given transfer content
|
||||
encoding.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
In the Quoted-Printable case, the user can specify whether the data is
|
||||
textual or binary, by passing the <tt>mode</tt> strings "<tt>text</tt>" or
|
||||
"<tt>binary</tt>". <tt>Mode</tt> defaults to "<tt>text</tt>".
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Although both transfer content encodings specify a limit for the line
|
||||
length, the encoding filters do <em>not</em> break text into lines (for
|
||||
added flexibility).
|
||||
Below is a filter that converts binary data to the Base64 transfer content
|
||||
encoding and breaks it into lines of the correct size.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
base64 = ltn12.filter.chain(
|
||||
mime.encode("base64"),
|
||||
mime.wrap("base64")
|
||||
)
|
||||
</pre>
|
||||
|
||||
<p class="note">
|
||||
Note: Text data <em>has</em> to be converted to canonic form
|
||||
<em>before</em> being encoded.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
base64 = ltn12.filter.chain(
|
||||
mime.normalize(),
|
||||
mime.encode("base64"),
|
||||
mime.wrap("base64")
|
||||
)
|
||||
</pre>
|
||||
|
||||
<!-- normalize ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="normalize">
|
||||
mime.<b>normalize(</b>[marker]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Converts most common end-of-line markers to a specific given marker.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Marker</tt> is the new marker. It defaults to CRLF, the canonic
|
||||
end-of-line marker defined by the MIME standard.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns a filter that performs the conversion.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: There is no perfect solution to this problem. Different end-of-line
|
||||
markers are an evil that will probably plague developers forever.
|
||||
This function, however, will work perfectly for text created with any of
|
||||
the most common end-of-line markers, i.e. the Mac OS (CR), the Unix (LF),
|
||||
or the DOS (CRLF) conventions. Even if the data has mixed end-of-line
|
||||
markers, the function will still work well, although it doesn't
|
||||
guarantee that the number of empty lines will be correct.
|
||||
</p>
|
||||
|
||||
<!-- stuff +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="stuff">
|
||||
mime.<b>stuff()</b><br>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns a filter that performs stuffing of SMTP messages.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The <a href="smtp.html#send"><tt>smtp.send</tt></a> function
|
||||
uses this filter automatically. You don't need to chain it with your
|
||||
source, or apply it to your message body.
|
||||
</p>
|
||||
|
||||
<!-- wrap +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="wrap">
|
||||
mime.<b>wrap(</b>"text" [, length]<b>)</b><br>
|
||||
mime.<b>wrap(</b>"base64"<b>)</b><br>
|
||||
mime.<b>wrap(</b>"quoted-printable"<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns a filter that breaks data into lines.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
The "<tt>text</tt>" line-wrap filter simply breaks text into lines by
|
||||
inserting CRLF end-of-line markers at appropriate positions.
|
||||
<tt>Length</tt> defaults 76.
|
||||
The "<tt>base64</tt>" line-wrap filter works just like the default
|
||||
"<tt>text</tt>" line-wrap filter with default length.
|
||||
The function can also wrap "<tt>quoted-printable</tt>" lines, taking care
|
||||
not to break lines in the middle of an escaped character. In that case, the
|
||||
line length is fixed at 76.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
For example, to create an encoding filter for the Quoted-Printable transfer content encoding of text data, do the following:
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
qp = ltn12.filter.chain(
|
||||
mime.normalize(),
|
||||
mime.encode("quoted-printable"),
|
||||
mime.wrap("quoted-printable")
|
||||
)
|
||||
</pre>
|
||||
|
||||
<p class="note">
|
||||
Note: To break into lines with a different end-of-line convention, apply
|
||||
a normalization filter after the line break filter.
|
||||
</p>
|
||||
|
||||
<!-- Low-level ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h3 id="low">Low-level filters</h3>
|
||||
|
||||
<!-- b64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="b64">
|
||||
A, B = mime.<b>b64(</b>C [, D]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Low-level filter to perform Base64 encoding.
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
<tt>A</tt> is the encoded version of the largest prefix of
|
||||
<tt>C..D</tt>
|
||||
that can be encoded unambiguously. <tt>B</tt> has the remaining bytes of
|
||||
<tt>C..D</tt>, <em>before</em> encoding.
|
||||
If <tt>D</tt> is <tt><b>nil</b></tt>, <tt>A</tt> is padded with
|
||||
the encoding of the remaining bytes of <tt>C</tt>.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The simplest use of this function is to encode a string into it's
|
||||
Base64 transfer content encoding. Notice the extra parenthesis around the
|
||||
call to <tt>mime.b64</tt>, to discard the second return value.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
print((mime.b64("diego:password")))
|
||||
--> ZGllZ286cGFzc3dvcmQ=
|
||||
</pre>
|
||||
|
||||
<!-- dot +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
<p class="name" id="dot">
|
||||
A, n = mime.<b>dot(</b>m [, B]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Low-level filter to perform SMTP stuffing and enable transmission of
|
||||
messages containing the sequence "CRLF.CRLF".
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>A</tt> is the stuffed version of <tt>B</tt>. '<tt>n</tt>' gives the
|
||||
number of characters from the sequence CRLF seen in the end of <tt>B</tt>.
|
||||
'<tt>m</tt>' should tell the same, but for the previous chunk.
|
||||
</p>
|
||||
|
||||
<p class="note">Note: The message body is defined to begin with
|
||||
an implicit CRLF. Therefore, to stuff a message correctly, the
|
||||
first <tt>m</tt> should have the value 2.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
print((string.gsub(mime.dot(2, ".\r\nStuffing the message.\r\n.\r\n."), "\r\n", "\\n")))
|
||||
--> ..\nStuffing the message.\n..\n..
|
||||
</pre>
|
||||
|
||||
<p class="note">
|
||||
Note: The <a href="smtp.html#send"><tt>smtp.send</tt></a> function
|
||||
uses this filter automatically. You don't need to
|
||||
apply it again.
|
||||
</p>
|
||||
|
||||
<!-- eol ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="eol">
|
||||
A, B = mime.<b>eol(</b>C [, D, marker]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Low-level filter to perform end-of-line marker translation.
|
||||
For each chunk, the function needs to know if the last character of the
|
||||
previous chunk could be part of an end-of-line marker or not. This is the
|
||||
context the function receives besides the chunk. An updated version of
|
||||
the context is returned after each new chunk.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>A</tt> is the translated version of <tt>D</tt>. <tt>C</tt> is the
|
||||
ASCII value of the last character of the previous chunk, if it was a
|
||||
candidate for line break, or 0 otherwise.
|
||||
<tt>B</tt> is the same as <tt>C</tt>, but for the current
|
||||
chunk. <tt>Marker</tt> gives the new end-of-line marker and defaults to CRLF.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- translates the end-of-line marker to UNIX
|
||||
unix = mime.eol(0, dos, "\n")
|
||||
</pre>
|
||||
|
||||
<!-- qp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="qp">
|
||||
A, B = mime.<b>qp(</b>C [, D, marker]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Low-level filter to perform Quoted-Printable encoding.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>A</tt> is the encoded version of the largest prefix of
|
||||
<tt>C..D</tt>
|
||||
that can be encoded unambiguously. <tt>B</tt> has the remaining bytes of
|
||||
<tt>C..D</tt>, <em>before</em> encoding.
|
||||
If <tt>D</tt> is <tt><b>nil</b></tt>, <tt>A</tt> is padded with
|
||||
the encoding of the remaining bytes of <tt>C</tt>.
|
||||
Throughout encoding, occurrences of CRLF are replaced by the
|
||||
<tt>marker</tt>, which itself defaults to CRLF.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The simplest use of this function is to encode a string into it's
|
||||
Quoted-Printable transfer content encoding.
|
||||
Notice the extra parenthesis around the call to <tt>mime.qp</tt>, to discard the second return value.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
print((mime.qp("ma<6D><61>")))
|
||||
--> ma=E7=E3=
|
||||
</pre>
|
||||
|
||||
<!-- qpwrp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="qpwrp">
|
||||
A, m = mime.<b>qpwrp(</b>n [, B, length]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Low-level filter to break Quoted-Printable text into lines.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>A</tt> is a copy of <tt>B</tt>, broken into lines of at most
|
||||
<tt>length</tt> bytes (defaults to 76).
|
||||
'<tt>n</tt>' should tell how many bytes are left for the first
|
||||
line of <tt>B</tt> and '<tt>m</tt>' returns the number of bytes
|
||||
left in the last line of <tt>A</tt>.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: Besides breaking text into lines, this function makes sure the line
|
||||
breaks don't fall in the middle of an escaped character combination. Also,
|
||||
this function only breaks lines that are bigger than <tt>length</tt> bytes.
|
||||
</p>
|
||||
|
||||
<!-- unb64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="unb64">
|
||||
A, B = mime.<b>unb64(</b>C [, D]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Low-level filter to perform Base64 decoding.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>A</tt> is the decoded version of the largest prefix of
|
||||
<tt>C..D</tt>
|
||||
that can be decoded unambiguously. <tt>B</tt> has the remaining bytes of
|
||||
<tt>C..D</tt>, <em>before</em> decoding.
|
||||
If <tt>D</tt> is <tt><b>nil</b></tt>, <tt>A</tt> is the empty string
|
||||
and <tt>B</tt> returns whatever couldn't be decoded.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The simplest use of this function is to decode a string from it's
|
||||
Base64 transfer content encoding.
|
||||
Notice the extra parenthesis around the call to <tt>mime.unqp</tt>, to discard the second return value.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
print((mime.unb64("ZGllZ286cGFzc3dvcmQ=")))
|
||||
--> diego:password
|
||||
</pre>
|
||||
|
||||
<!-- unqp +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="unqp">
|
||||
A, B = mime.<b>unqp(</b>C [, D]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Low-level filter to remove the Quoted-Printable transfer content encoding
|
||||
from data.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>A</tt> is the decoded version of the largest prefix of
|
||||
<tt>C..D</tt>
|
||||
that can be decoded unambiguously. <tt>B</tt> has the remaining bytes of
|
||||
<tt>C..D</tt>, <em>before</em> decoding.
|
||||
If <tt>D</tt> is <tt><b>nil</b></tt>, <tt>A</tt> is augmented with
|
||||
the encoding of the remaining bytes of <tt>C</tt>.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The simplest use of this function is to decode a string from it's
|
||||
Quoted-Printable transfer content encoding.
|
||||
Notice the extra parenthesis around the call to <tt>mime.unqp</tt>, to discard the second return value.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
print((mime.qp("ma=E7=E3=")))
|
||||
--> ma<6D><61>
|
||||
</pre>
|
||||
|
||||
<!-- wrp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="wrp">
|
||||
A, m = mime.<b>wrp(</b>n [, B, length]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Low-level filter to break text into lines with CRLF marker.
|
||||
Text is assumed to be in the <a href="#normalize"><tt>normalize</tt></a> form.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>A</tt> is a copy of <tt>B</tt>, broken into lines of at most
|
||||
<tt>length</tt> bytes (defaults to 76).
|
||||
'<tt>n</tt>' should tell how many bytes are left for the first
|
||||
line of <tt>B</tt> and '<tt>m</tt>' returns the number of bytes
|
||||
left in the last line of <tt>A</tt>.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: This function only breaks lines that are bigger than
|
||||
<tt>length</tt> bytes. The resulting line length does not include the CRLF
|
||||
marker.
|
||||
</p>
|
||||
|
||||
|
||||
<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="footer">
|
||||
<hr>
|
||||
<center>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#down">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
<p>
|
||||
<small>
|
||||
Last modified by Diego Nehab on <br>
|
||||
Fri Mar 4 15:19:17 BRT 2016
|
||||
</small>
|
||||
</p>
|
||||
</center>
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,55 @@
|
|||
body {
|
||||
margin-left: 1em;
|
||||
margin-right: 1em;
|
||||
font-family: "Verdana", sans-serif;
|
||||
background: #ffffff;
|
||||
}
|
||||
|
||||
tt {
|
||||
font-family: "Andale Mono", monospace;
|
||||
}
|
||||
|
||||
h1, h2, h3, h4 { margin-left: 0em; }
|
||||
|
||||
|
||||
h3 { padding-top: 1em; }
|
||||
|
||||
p { margin-left: 1em; }
|
||||
|
||||
p.name {
|
||||
font-family: "Andale Mono", monospace;
|
||||
padding-top: 1em;
|
||||
margin-left: 0em;
|
||||
}
|
||||
|
||||
a[href] { color: #00007f; }
|
||||
|
||||
blockquote { margin-left: 3em; }
|
||||
|
||||
pre.example {
|
||||
background: #ccc;
|
||||
padding: 1em;
|
||||
margin-left: 1em;
|
||||
font-family: "Andale Mono", monospace;
|
||||
font-size: small;
|
||||
}
|
||||
|
||||
hr {
|
||||
margin-left: 0em;
|
||||
background: #00007f;
|
||||
border: 0px;
|
||||
height: 1px;
|
||||
}
|
||||
|
||||
ul { list-style-type: disc; }
|
||||
|
||||
table.index { border: 1px #00007f; }
|
||||
table.index td { text-align: left; vertical-align: top; }
|
||||
table.index ul { padding-top: 0em; margin-top: 0em; }
|
||||
|
||||
h1:first-letter,
|
||||
h2:first-letter,
|
||||
h2:first-letter,
|
||||
h3:first-letter { color: #00007f; }
|
||||
|
||||
div.header, div.footer { margin-left: 0em; }
|
||||
|
|
@ -0,0 +1,261 @@
|
|||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
||||
"http://www.w3.org/TR/html4/strict.dtd">
|
||||
<html>
|
||||
|
||||
<head>
|
||||
<meta name="description" content="LuaSocket: Index to reference manual">
|
||||
<meta name="keywords" content="Lua, LuaSocket, Index, Manual, Network, Library,
|
||||
Support, Manual">
|
||||
<title>LuaSocket: Index to reference manual</title>
|
||||
<link rel="stylesheet" href="reference.css" type="text/css">
|
||||
</head>
|
||||
|
||||
<body>
|
||||
|
||||
<!-- header ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="header">
|
||||
<hr>
|
||||
<center>
|
||||
<table summary="LuaSocket logo">
|
||||
<tr><td align="center"><a href="http://www.lua.org">
|
||||
<img width="128" height="128" border="0" alt="LuaSocket" src="luasocket.png">
|
||||
</a></td></tr>
|
||||
<tr><td align="center" valign="top">Network support for the Lua language
|
||||
</td></tr>
|
||||
</table>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
</center>
|
||||
<hr>
|
||||
</div>
|
||||
|
||||
<!-- reference +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2>Reference</h2>
|
||||
|
||||
<blockquote>
|
||||
<a href="dns.html">DNS (in socket)</a>
|
||||
<blockquote>
|
||||
<a href="dns.html#getaddrinfo">getaddrinfo</a>,
|
||||
<a href="dns.html#gethostname">gethostname</a>,
|
||||
<a href="dns.html#tohostname">tohostname</a>,
|
||||
<a href="dns.html#toip">toip</a>.
|
||||
</blockquote>
|
||||
</blockquote>
|
||||
|
||||
<!-- ftp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<blockquote>
|
||||
<a href="ftp.html">FTP</a>
|
||||
<blockquote>
|
||||
<a href="ftp.html#get">get</a>,
|
||||
<a href="ftp.html#put">put</a>.
|
||||
</blockquote>
|
||||
</blockquote>
|
||||
|
||||
<!-- http +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<blockquote>
|
||||
<a href="http.html">HTTP</a>
|
||||
<blockquote>
|
||||
<a href="http.html#request">request</a>.
|
||||
</blockquote>
|
||||
</blockquote>
|
||||
|
||||
<!-- ltn12 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<blockquote>
|
||||
<a href="ltn12.html">LTN12</a>
|
||||
<blockquote>
|
||||
<a href="ltn12.html#filter">filter</a>:
|
||||
<a href="ltn12.html#filter.chain">chain</a>,
|
||||
<a href="ltn12.html#filter.cycle">cycle</a>.
|
||||
</blockquote>
|
||||
<blockquote>
|
||||
<a href="ltn12.html#pump">pump</a>:
|
||||
<a href="ltn12.html#pump.all">all</a>,
|
||||
<a href="ltn12.html#pump.step">step</a>.
|
||||
</blockquote>
|
||||
<blockquote>
|
||||
<a href="ltn12.html#sink">sink</a>:
|
||||
<a href="ltn12.html#sink.chain">chain</a>,
|
||||
<a href="ltn12.html#sink.error">error</a>,
|
||||
<a href="ltn12.html#sink.file">file</a>,
|
||||
<a href="ltn12.html#sink.null">null</a>,
|
||||
<a href="ltn12.html#sink.simplify">simplify</a>,
|
||||
<a href="ltn12.html#sink.table">table</a>.
|
||||
</blockquote>
|
||||
<blockquote>
|
||||
<a href="ltn12.html#source">source</a>:
|
||||
<a href="ltn12.html#source.cat">cat</a>,
|
||||
<a href="ltn12.html#source.chain">chain</a>,
|
||||
<a href="ltn12.html#source.empty">empty</a>,
|
||||
<a href="ltn12.html#source.error">error</a>,
|
||||
<a href="ltn12.html#source.file">file</a>,
|
||||
<a href="ltn12.html#source.simplify">simplify</a>,
|
||||
<a href="ltn12.html#source.string">string</a>,
|
||||
<a href="ltn12.html#source.table">table</a>.
|
||||
</blockquote>
|
||||
</blockquote>
|
||||
|
||||
<!-- mime +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<blockquote>
|
||||
<a href="mime.html">MIME</a>
|
||||
<blockquote>
|
||||
<a href="mime.html#high">high-level</a>:
|
||||
<a href="mime.html#decode">decode</a>,
|
||||
<a href="mime.html#encode">encode</a>,
|
||||
<a href="mime.html#normalize">normalize</a>,
|
||||
<a href="mime.html#stuff">stuff</a>,
|
||||
<a href="mime.html#wrap">wrap</a>.
|
||||
</blockquote>
|
||||
<blockquote>
|
||||
<a href="mime.html#low">low-level</a>:
|
||||
<a href="mime.html#b64">b64</a>,
|
||||
<a href="mime.html#dot">dot</a>,
|
||||
<a href="mime.html#eol">eol</a>,
|
||||
<a href="mime.html#qp">qp</a>,
|
||||
<a href="mime.html#qpwrp">qpwrp</a>,
|
||||
<a href="mime.html#unb64">unb64</a>,
|
||||
<a href="mime.html#unqp">unqp</a>,
|
||||
<a href="mime.html#wrp">wrp</a>.
|
||||
</blockquote>
|
||||
</blockquote>
|
||||
|
||||
<!-- smtp +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<blockquote>
|
||||
<a href="smtp.html">SMTP</a>
|
||||
<blockquote>
|
||||
<a href="smtp.html#message">message</a>,
|
||||
<a href="smtp.html#send">send</a>.
|
||||
</blockquote>
|
||||
</blockquote>
|
||||
|
||||
<!-- socket +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<blockquote>
|
||||
<a href="socket.html">Socket</a>
|
||||
<blockquote>
|
||||
<a href="socket.html#bind">bind</a>,
|
||||
<a href="socket.html#connect">connect</a>,
|
||||
<a href="socket.html#connect">connect4</a>,
|
||||
<a href="socket.html#connect">connect6</a>,
|
||||
<a href="socket.html#datagramsize">_DATAGRAMSIZE</a>,
|
||||
<a href="socket.html#debug">_DEBUG</a>,
|
||||
<a href="dns.html#dns">dns</a>,
|
||||
<a href="socket.html#gettime">gettime</a>,
|
||||
<a href="socket.html#headers.canonic">headers.canonic</a>,
|
||||
<a href="socket.html#newtry">newtry</a>,
|
||||
<a href="socket.html#protect">protect</a>,
|
||||
<a href="socket.html#select">select</a>,
|
||||
<a href="socket.html#sink">sink</a>,
|
||||
<a href="socket.html#skip">skip</a>,
|
||||
<a href="socket.html#sleep">sleep</a>,
|
||||
<a href="socket.html#setsize">_SETSIZE</a>,
|
||||
<a href="socket.html#socketinvalid">_SOCKETINVALID</a>,
|
||||
<a href="socket.html#source">source</a>,
|
||||
<a href="tcp.html#socket.tcp">tcp</a>,
|
||||
<a href="tcp.html#socket.tcp4">tcp4</a>,
|
||||
<a href="tcp.html#socket.tcp6">tcp6</a>,
|
||||
<a href="socket.html#try">try</a>,
|
||||
<a href="udp.html#socket.udp">udp</a>,
|
||||
<a href="udp.html#socket.udp4">udp4</a>,
|
||||
<a href="udp.html#socket.udp6">udp6</a>,
|
||||
<a href="socket.html#version">_VERSION</a>.
|
||||
</blockquote>
|
||||
</blockquote>
|
||||
|
||||
<!-- tcp +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<blockquote>
|
||||
<a href="tcp.html">TCP (in socket)</a>
|
||||
<blockquote>
|
||||
<a href="tcp.html#accept">accept</a>,
|
||||
<a href="tcp.html#bind">bind</a>,
|
||||
<a href="tcp.html#close">close</a>,
|
||||
<a href="tcp.html#connect">connect</a>,
|
||||
<a href="tcp.html#dirty">dirty</a>,
|
||||
<a href="tcp.html#getfd">getfd</a>,
|
||||
<a href="tcp.html#getoption">getoption</a>,
|
||||
<a href="tcp.html#getpeername">getpeername</a>,
|
||||
<a href="tcp.html#getsockname">getsockname</a>,
|
||||
<a href="tcp.html#getstats">getstats</a>,
|
||||
<a href="tcp.html#gettimeout">gettimeout</a>,
|
||||
<a href="tcp.html#listen">listen</a>,
|
||||
<a href="tcp.html#receive">receive</a>,
|
||||
<a href="tcp.html#send">send</a>,
|
||||
<a href="tcp.html#setfd">setfd</a>,
|
||||
<a href="tcp.html#setoption">setoption</a>,
|
||||
<a href="tcp.html#setstats">setstats</a>,
|
||||
<a href="tcp.html#settimeout">settimeout</a>,
|
||||
<a href="tcp.html#shutdown">shutdown</a>.
|
||||
</blockquote>
|
||||
</blockquote>
|
||||
|
||||
<!-- udp +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<blockquote>
|
||||
<a href="udp.html">UDP (in socket)</a>
|
||||
<blockquote>
|
||||
<a href="udp.html#close">close</a>,
|
||||
<a href="udp.html#getoption">getoption</a>,
|
||||
<a href="udp.html#getpeername">getpeername</a>,
|
||||
<a href="udp.html#getsockname">getsockname</a>,
|
||||
<a href="udp.html#gettimeout">gettimeout</a>,
|
||||
<a href="udp.html#receive">receive</a>,
|
||||
<a href="udp.html#receivefrom">receivefrom</a>,
|
||||
<a href="udp.html#send">send</a>,
|
||||
<a href="udp.html#sendto">sendto</a>,
|
||||
<a href="udp.html#setpeername">setpeername</a>,
|
||||
<a href="udp.html#setsockname">setsockname</a>,
|
||||
<a href="udp.html#setoption">setoption</a>,
|
||||
<a href="udp.html#settimeout">settimeout</a>.
|
||||
</blockquote>
|
||||
</blockquote>
|
||||
|
||||
<!-- url ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<blockquote>
|
||||
<a href="url.html">URL</a>
|
||||
<blockquote>
|
||||
<a href="url.html#absolute">absolute</a>,
|
||||
<a href="url.html#build">build</a>,
|
||||
<a href="url.html#build_path">build_path</a>,
|
||||
<a href="url.html#escape">escape</a>,
|
||||
<a href="url.html#parse">parse</a>,
|
||||
<a href="url.html#parse_path">parse_path</a>,
|
||||
<a href="url.html#unescape">unescape</a>.
|
||||
</blockquote>
|
||||
</blockquote>
|
||||
|
||||
<!-- footer ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="footer">
|
||||
<hr>
|
||||
<center>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#down">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
<p>
|
||||
<small>
|
||||
Last modified by Diego Nehab on <br>
|
||||
Thu Apr 20 00:25:47 EDT 2006
|
||||
</small>
|
||||
</p>
|
||||
</center>
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,419 @@
|
|||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
||||
"http://www.w3.org/TR/html4/strict.dtd">
|
||||
<html>
|
||||
|
||||
<head>
|
||||
<meta name="description" content="LuaSocket: SMTP support">
|
||||
<meta name="keywords" content="Lua, LuaSocket, SMTP, E-Mail, MIME, Multipart,
|
||||
Library, Support">
|
||||
<title>LuaSocket: SMTP support</title>
|
||||
<link rel="stylesheet" href="reference.css" type="text/css">
|
||||
</head>
|
||||
|
||||
<body>
|
||||
|
||||
<!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="header">
|
||||
<hr>
|
||||
<center>
|
||||
<table summary="LuaSocket logo">
|
||||
<tr><td align="center"><a href="http://www.lua.org">
|
||||
<img width="128" height="128" border="0" alt="LuaSocket" src="luasocket.png">
|
||||
</a></td></tr>
|
||||
<tr><td align="center" valign="top">Network support for the Lua language
|
||||
</td></tr>
|
||||
</table>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
</center>
|
||||
<hr>
|
||||
</div>
|
||||
|
||||
<!-- smtp +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2 id="smtp">SMTP</h2>
|
||||
|
||||
<p> The <tt>smtp</tt> namespace provides functionality to send e-mail
|
||||
messages. The high-level API consists of two functions: one to
|
||||
define an e-mail message, and another to actually send the message.
|
||||
Although almost all users will find that these functions provide more than
|
||||
enough functionality, the underlying implementation allows for even more
|
||||
control (if you bother to read the code).
|
||||
</p>
|
||||
|
||||
<p>The implementation conforms to the Simple Mail Transfer Protocol,
|
||||
<a href="http://www.ietf.org/rfc/rfc2821.txt">RFC 2821</a>.
|
||||
Another RFC of interest is <a
|
||||
href="http://www.ietf.org/rfc/rfc2822.txt">RFC 2822</a>,
|
||||
which governs the Internet Message Format.
|
||||
Multipart messages (those that contain attachments) are part
|
||||
of the MIME standard, but described mainly
|
||||
in <a href="http://www.ietf.org/rfc/rfc2046.txt">RFC 2046</a>.</p>
|
||||
|
||||
<p> In the description below, good understanding of <a
|
||||
href="http://lua-users.org/wiki/FiltersSourcesAndSinks"> LTN012, Filters
|
||||
sources and sinks</a> and the <a href="mime.html">MIME</a> module is
|
||||
assumed. In fact, the SMTP module was the main reason for their
|
||||
creation. </p>
|
||||
|
||||
<p>
|
||||
To obtain the <tt>smtp</tt> namespace, run:
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- loads the SMTP module and everything it requires
|
||||
local smtp = require("socket.smtp")
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
MIME headers are represented as a Lua table in the form:
|
||||
</p>
|
||||
|
||||
<blockquote>
|
||||
<table summary="MIME headers in Lua table">
|
||||
<tr><td><tt>
|
||||
headers = {<br>
|
||||
field-1-name = <i>field-1-value</i>,<br>
|
||||
field-2-name = <i>field-2-value</i>,<br>
|
||||
field-3-name = <i>field-3-value</i>,<br>
|
||||
...<br>
|
||||
field-n-name = <i>field-n-value</i><br>
|
||||
}
|
||||
</tt></td></tr>
|
||||
</table>
|
||||
</blockquote>
|
||||
|
||||
<p>
|
||||
Field names are case insensitive (as specified by the standard) and all
|
||||
functions work with lowercase field names (but see
|
||||
<a href="socket.html#headers.canonic"><tt>socket.headers.canonic</tt></a>).
|
||||
Field values are left unmodified.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: MIME headers are independent of order. Therefore, there is no problem
|
||||
in representing them in a Lua table.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The following constants can be set to control the default behavior of
|
||||
the SMTP module:
|
||||
</p>
|
||||
|
||||
<ul>
|
||||
<li> <tt>DOMAIN</tt>: domain used to greet the server;</li>
|
||||
<li> <tt>PORT</tt>: default port used for the connection;</li>
|
||||
<li> <tt>SERVER</tt>: default server used for the connection;</li>
|
||||
<li> <tt>TIMEOUT</tt>: default timeout for all I/O operations;</li>
|
||||
<li> <tt>ZONE</tt>: default time zone.</li>
|
||||
</ul>
|
||||
|
||||
<!-- message ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="message">
|
||||
smtp.<b>message(</b>mesgt<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns a <em>simple</em>
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a> source that sends an SMTP message body, possibly multipart (arbitrarily deep).
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
The only parameter of the function is a table describing the message.
|
||||
<tt>Mesgt</tt> has the following form (notice the recursive structure):
|
||||
</p>
|
||||
|
||||
<blockquote>
|
||||
<table summary="Mesgt table structure">
|
||||
<tr><td><tt>
|
||||
mesgt = {<br>
|
||||
headers = <i>header-table</i>,<br>
|
||||
body = <i>LTN12 source</i> or <i>string</i> or
|
||||
<i>multipart-mesgt</i><br>
|
||||
}<br>
|
||||
<br>
|
||||
multipart-mesgt = {<br>
|
||||
[preamble = <i>string</i>,]<br>
|
||||
[1] = <i>mesgt</i>,<br>
|
||||
[2] = <i>mesgt</i>,<br>
|
||||
...<br>
|
||||
[<i>n</i>] = <i>mesgt</i>,<br>
|
||||
[epilogue = <i>string</i>,]<br>
|
||||
}<br>
|
||||
</tt></td></tr>
|
||||
</table>
|
||||
</blockquote>
|
||||
|
||||
<p class="parameters">
|
||||
For a simple message, all that is needed is a set of <tt>headers</tt>
|
||||
and the <tt>body</tt>. The message <tt>body</tt> can be given as a string
|
||||
or as a <em>simple</em>
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
|
||||
source. For multipart messages, the body is a table that
|
||||
recursively defines each part as an independent message, plus an optional
|
||||
<tt>preamble</tt> and <tt>epilogue</tt>.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns a <em>simple</em>
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
|
||||
source that produces the
|
||||
message contents as defined by <tt>mesgt</tt>, chunk by chunk.
|
||||
Hopefully, the following
|
||||
example will make things clear. When in doubt, refer to the appropriate RFC
|
||||
as listed in the introduction. </p>
|
||||
|
||||
<pre class="example">
|
||||
-- load the smtp support and its friends
|
||||
local smtp = require("socket.smtp")
|
||||
local mime = require("mime")
|
||||
local ltn12 = require("ltn12")
|
||||
|
||||
-- creates a source to send a message with two parts. The first part is
|
||||
-- plain text, the second part is a PNG image, encoded as base64.
|
||||
source = smtp.message{
|
||||
headers = {
|
||||
-- Remember that headers are *ignored* by smtp.send.
|
||||
from = "Sicrano de Oliveira <sicrano@example.com>",
|
||||
to = "Fulano da Silva <fulano@example.com>",
|
||||
subject = "Here is a message with attachments"
|
||||
},
|
||||
body = {
|
||||
preamble = "If your client doesn't understand attachments, \r\n" ..
|
||||
"it will still display the preamble and the epilogue.\r\n" ..
|
||||
"Preamble will probably appear even in a MIME enabled client.",
|
||||
-- first part: no headers means plain text, us-ascii.
|
||||
-- The mime.eol low-level filter normalizes end-of-line markers.
|
||||
[1] = {
|
||||
body = mime.eol(0, [[
|
||||
Lines in a message body should always end with CRLF.
|
||||
The smtp module will *NOT* perform translation. However, the
|
||||
send function *DOES* perform SMTP stuffing, whereas the message
|
||||
function does *NOT*.
|
||||
]])
|
||||
},
|
||||
-- second part: headers describe content to be a png image,
|
||||
-- sent under the base64 transfer content encoding.
|
||||
-- notice that nothing happens until the message is actually sent.
|
||||
-- small chunks are loaded into memory right before transmission and
|
||||
-- translation happens on the fly.
|
||||
[2] = {
|
||||
headers = {
|
||||
["content-type"] = 'image/png; name="image.png"',
|
||||
["content-disposition"] = 'attachment; filename="image.png"',
|
||||
["content-description"] = 'a beautiful image',
|
||||
["content-transfer-encoding"] = "BASE64"
|
||||
},
|
||||
body = ltn12.source.chain(
|
||||
ltn12.source.file(io.open("image.png", "rb")),
|
||||
ltn12.filter.chain(
|
||||
mime.encode("base64"),
|
||||
mime.wrap()
|
||||
)
|
||||
)
|
||||
},
|
||||
epilogue = "This might also show up, but after the attachments"
|
||||
}
|
||||
}
|
||||
|
||||
-- finally send it
|
||||
r, e = smtp.send{
|
||||
from = "<sicrano@example.com>",
|
||||
rcpt = "<fulano@example.com>",
|
||||
source = source,
|
||||
}
|
||||
</pre>
|
||||
|
||||
|
||||
<!-- send +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="send">
|
||||
smtp.<b>send{</b><br>
|
||||
from = <i>string</i>,<br>
|
||||
rcpt = <i>string</i> or <i>string-table</i>,<br>
|
||||
source = <i>LTN12 source</i>,<br>
|
||||
[user = <i>string</i>,]<br>
|
||||
[password = <i>string</i>,]<br>
|
||||
[server = <i>string</i>,]<br>
|
||||
[port = <i>number</i>,]<br>
|
||||
[domain = <i>string</i>,]<br>
|
||||
[step = <i>LTN12 pump step</i>,]<br>
|
||||
[create = <i>function</i>]<br>
|
||||
<b>}</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Sends a message to a recipient list. Since sending messages is not as
|
||||
simple as downloading an URL from a FTP or HTTP server, this function
|
||||
doesn't have a simple interface. However, see the
|
||||
<a href="#message"><tt>message</tt></a> source factory for
|
||||
a very powerful way to define the message contents.
|
||||
</p>
|
||||
|
||||
|
||||
<p class="parameters">
|
||||
The sender is given by the e-mail address in the <tt>from</tt> field.
|
||||
<tt>Rcpt</tt> is a Lua table with one entry for each recipient e-mail
|
||||
address, or a string
|
||||
in case there is just one recipient.
|
||||
The contents of the message are given by a <em>simple</em>
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
|
||||
<tt>source</tt>. Several arguments are optional:
|
||||
</p>
|
||||
<ul>
|
||||
<li> <tt>user</tt>, <tt>password</tt>: User and password for
|
||||
authentication. The function will attempt LOGIN and PLAIN authentication
|
||||
methods if supported by the server (both are unsafe);</li>
|
||||
<li> <tt>server</tt>: Server to connect to. Defaults to "localhost";</li>
|
||||
<li> <tt>port</tt>: Port to connect to. Defaults to 25;</li>
|
||||
<li> <tt>domain</tt>: Domain name used to greet the server; Defaults to the
|
||||
local machine host name;</li>
|
||||
<li> <tt>step</tt>:
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
|
||||
pump step function used to pass data from the
|
||||
source to the server. Defaults to the LTN12 <tt>pump.step</tt> function;</li>
|
||||
<li><tt>create</tt>: An optional function to be used instead of
|
||||
<a href="tcp.html#socket.tcp"><tt>socket.tcp</tt></a> when the communications socket is created.</li>
|
||||
</ul>
|
||||
|
||||
<p class="return">
|
||||
If successful, the function returns 1. Otherwise, the function returns
|
||||
<b><tt>nil</tt></b> followed by an error message.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: SMTP servers can be very picky with the format of e-mail
|
||||
addresses. To be safe, use only addresses of the form
|
||||
"<tt><fulano@example.com></tt>" in the <tt>from</tt> and
|
||||
<tt>rcpt</tt> arguments to the <tt>send</tt> function. In headers, e-mail
|
||||
addresses can take whatever form you like. </p>
|
||||
|
||||
<p class="note">
|
||||
Big note: There is a good deal of misconception with the use of the
|
||||
destination address field headers, i.e., the '<tt>To</tt>', '<tt>Cc</tt>',
|
||||
and, more importantly, the '<tt>Bcc</tt>' headers. Do <em>not</em> add a
|
||||
'<tt>Bcc</tt>' header to your messages because it will probably do the
|
||||
exact opposite of what you expect.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Only recipients specified in the <tt>rcpt</tt> list will receive a copy of the
|
||||
message. Each recipient of an SMTP mail message receives a copy of the
|
||||
message body along with the headers, and nothing more. The headers
|
||||
<em>are</em> part of the message and should be produced by the
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
|
||||
<tt>source</tt> function. The <tt>rcpt</tt> list is <em>not</em>
|
||||
part of the message and will not be sent to anyone.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
<a href="http://www.ietf.org/rfc/rfc2822.txt">RFC 2822</a>
|
||||
has two <em>important and short</em> sections, "3.6.3. Destination address
|
||||
fields" and "5. Security considerations", explaining the proper
|
||||
use of these headers. Here is a summary of what it says:
|
||||
</p>
|
||||
|
||||
<ul>
|
||||
<li> <tt>To</tt>: contains the address(es) of the primary recipient(s)
|
||||
of the message;</li>
|
||||
<li> <tt>Cc</tt>: (where the "Cc" means "Carbon Copy" in the sense of
|
||||
making a copy on a typewriter using carbon paper) contains the
|
||||
addresses of others who are to receive the message, though the
|
||||
content of the message may not be directed at them;</li>
|
||||
<li> <tt>Bcc</tt>: (where the "Bcc" means "Blind Carbon
|
||||
Copy") contains addresses of recipients of the message whose addresses are not
|
||||
to be revealed to other recipients of the message.</li>
|
||||
</ul>
|
||||
|
||||
<p class="note">
|
||||
The LuaSocket <tt>send</tt> function does not care or interpret the
|
||||
headers you send, but it gives you full control over what is sent and
|
||||
to whom it is sent:
|
||||
</p>
|
||||
<ul>
|
||||
<li> If someone is to receive the message, the e-mail address <em>has</em>
|
||||
to be in the recipient list. This is the only parameter that controls who
|
||||
gets a copy of the message;</li>
|
||||
<li> If there are multiple recipients, none of them will automatically
|
||||
know that someone else got that message. That is, the default behavior is
|
||||
similar to the <tt>Bcc</tt> field of popular e-mail clients;</li>
|
||||
<li> It is up to you to add the <tt>To</tt> header with the list of primary
|
||||
recipients so that other recipients can see it;</li>
|
||||
<li> It is also up to you to add the <tt>Cc</tt> header with the
|
||||
list of additional recipients so that everyone else sees it;</li>
|
||||
<li> Adding a header <tt>Bcc</tt> is nonsense, unless it is
|
||||
empty. Otherwise, everyone receiving the message will see it and that is
|
||||
exactly what you <em>don't</em> want to happen!</li>
|
||||
</ul>
|
||||
|
||||
<p class="note">
|
||||
I hope this clarifies the issue. Otherwise, please refer to
|
||||
<a href="http://www.ietf.org/rfc/rfc2821.txt">RFC 2821</a>
|
||||
and
|
||||
<a href="http://www.ietf.org/rfc/rfc2822.txt">RFC 2822</a>.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- load the smtp support
|
||||
local smtp = require("socket.smtp")
|
||||
|
||||
-- Connects to server "localhost" and sends a message to users
|
||||
-- "fulano@example.com", "beltrano@example.com",
|
||||
-- and "sicrano@example.com".
|
||||
-- Note that "fulano" is the primary recipient, "beltrano" receives a
|
||||
-- carbon copy and neither of them knows that "sicrano" received a blind
|
||||
-- carbon copy of the message.
|
||||
from = "<luasocket@example.com>"
|
||||
|
||||
rcpt = {
|
||||
"<fulano@example.com>",
|
||||
"<beltrano@example.com>",
|
||||
"<sicrano@example.com>"
|
||||
}
|
||||
|
||||
mesgt = {
|
||||
headers = {
|
||||
to = "Fulano da Silva <fulano@example.com>",
|
||||
cc = '"Beltrano F. Nunes" <beltrano@example.com>',
|
||||
subject = "My first message"
|
||||
},
|
||||
body = "I hope this works. If it does, I can send you another 1000 copies."
|
||||
}
|
||||
|
||||
r, e = smtp.send{
|
||||
from = from,
|
||||
rcpt = rcpt,
|
||||
source = smtp.message(mesgt)
|
||||
}
|
||||
</pre>
|
||||
|
||||
<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="footer">
|
||||
<hr>
|
||||
<center>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#down">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
<p>
|
||||
<small>
|
||||
Last modified by Diego Nehab on <br>
|
||||
Thu Apr 20 00:25:51 EDT 2006
|
||||
</small>
|
||||
</p>
|
||||
</center>
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,481 @@
|
|||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
||||
"http://www.w3.org/TR/html4/strict.dtd">
|
||||
<html>
|
||||
|
||||
<head>
|
||||
<meta name="description" content="LuaSocket: The core namespace">
|
||||
<meta name="keywords" content="Lua, LuaSocket, Socket, Network, Library, Support">
|
||||
<title>LuaSocket: The socket namespace</title>
|
||||
<link rel="stylesheet" href="reference.css" type="text/css">
|
||||
</head>
|
||||
|
||||
<body>
|
||||
|
||||
<!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="header">
|
||||
<hr>
|
||||
<center>
|
||||
<table summary="LuaSocket logo">
|
||||
<tr><td align="center"><a href="https://www.lua.org">
|
||||
<img width="128" height="128" border="0" alt="LuaSocket" src="luasocket.png">
|
||||
</a></td></tr>
|
||||
<tr><td align="center" valign="top">Network support for the Lua language
|
||||
</td></tr>
|
||||
</table>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
</center>
|
||||
<hr>
|
||||
</div>
|
||||
|
||||
<!-- socket +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2 id="socket">The socket namespace</h2>
|
||||
|
||||
<p>
|
||||
The <tt>socket</tt> namespace contains the core functionality of LuaSocket.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
To obtain the <tt>socket</tt> namespace, run:
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- loads the socket module
|
||||
local socket = require("socket")
|
||||
</pre>
|
||||
|
||||
<!-- headers.canonic ++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="headers.canonic">
|
||||
socket.headers.<b>canonic</b></p>
|
||||
|
||||
<p> The <tt>socket.headers.canonic</tt> table
|
||||
is used by the HTTP and SMTP modules to translate from
|
||||
lowercase field names back into their canonic
|
||||
capitalization. When a lowercase field name exists as a key
|
||||
in this table, the associated value is substituted in
|
||||
whenever the field name is sent out.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
You can obtain the <tt>headers</tt> namespace if case run-time
|
||||
modifications are required by running:
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- loads the headers module
|
||||
local headers = require("headers")
|
||||
</pre>
|
||||
|
||||
|
||||
<!-- bind ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="bind">
|
||||
socket.<b>bind(</b>address, port [, backlog]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
This function is a shortcut that creates and returns a TCP server object
|
||||
bound to a local <tt>address</tt> and <tt>port</tt>, ready to
|
||||
accept client connections. Optionally,
|
||||
user can also specify the <tt>backlog</tt> argument to the
|
||||
<a href="tcp.html#listen"><tt>listen</tt></a> method (defaults to 32).
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The server object returned will have the option "<tt>reuseaddr</tt>"
|
||||
set to <tt><b>true</b></tt>.
|
||||
</p>
|
||||
|
||||
<!-- connect ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="connect">
|
||||
socket.<b>connect[46](</b>address, port [, locaddr] [, locport] [, family]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
This function is a shortcut that creates and returns a TCP client object
|
||||
connected to a remote <tt>address</tt> at a given <tt>port</tt>. Optionally,
|
||||
the user can also specify the local address and port to bind
|
||||
(<tt>locaddr</tt> and <tt>locport</tt>), or restrict the socket family
|
||||
to "<tt>inet</tt>" or "<tt>inet6</tt>".
|
||||
Without specifying <tt>family</tt> to <tt>connect</tt>, whether a tcp or tcp6
|
||||
connection is created depends on your system configuration. Two variations
|
||||
of connect are defined as simple helper functions that restrict the
|
||||
<tt>family</tt>, <tt>socket.connect4</tt> and <tt>socket.connect6</tt>.
|
||||
</p>
|
||||
|
||||
<!-- debug ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="debug">
|
||||
socket.<b>_DEBUG</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
This constant is set to <tt><b>true</b></tt> if the library was compiled
|
||||
with debug support.
|
||||
</p>
|
||||
|
||||
<!-- datagramsize +++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="datagramsize">
|
||||
socket.<b>_DATAGRAMSIZE</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Default datagram size used by calls to
|
||||
<a href="udp.html#receive"><tt>receive</tt></a> and
|
||||
<a href="udp.html#receivefrom"><tt>receivefrom</tt></a>.
|
||||
(Unless changed in compile time, the value is 8192.)
|
||||
</p>
|
||||
|
||||
<!-- get time +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="gettime">
|
||||
socket.<b>gettime()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns the UNIX time in seconds. You should subtract the values returned by this function
|
||||
to get meaningful values.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
t = socket.gettime()
|
||||
-- do stuff
|
||||
print(socket.gettime() - t .. " seconds elapsed")
|
||||
</pre>
|
||||
|
||||
<!-- newtry +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="newtry">
|
||||
socket.<b>newtry(</b>finalizer<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns a <em>clean</em>
|
||||
<a href="#try"><tt>try</tt></a>
|
||||
function that allows for cleanup before the exception
|
||||
is raised.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Finalizer</tt> is a function that will be called before
|
||||
<tt>try</tt> throws the exception.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns your customized <tt>try</tt> function.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: This idea saved a <em>lot</em> of work with the
|
||||
implementation of protocols in LuaSocket:
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
foo = socket.protect(function()
|
||||
-- connect somewhere
|
||||
local c = socket.try(socket.connect("somewhere", 42))
|
||||
-- create a try function that closes 'c' on error
|
||||
local try = socket.newtry(function() c:close() end)
|
||||
-- do everything reassured c will be closed
|
||||
try(c:send("hello there?\r\n"))
|
||||
local answer = try(c:receive())
|
||||
...
|
||||
try(c:send("good bye\r\n"))
|
||||
c:close()
|
||||
end)
|
||||
</pre>
|
||||
|
||||
|
||||
<!-- protect +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="protect">
|
||||
socket.<b>protect(</b>func<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Converts a function that throws exceptions into a safe function. This
|
||||
function only catches exceptions thrown by the <a href="#try"><tt>try</tt></a>
|
||||
and <a href="#newtry"><tt>newtry</tt></a> functions. It does not catch normal
|
||||
Lua errors.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Func</tt> is a function that calls
|
||||
<a href="#try"><tt>try</tt></a> (or <tt>assert</tt>, or <tt>error</tt>)
|
||||
to throw exceptions.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
Returns an equivalent function that instead of throwing exceptions in case of
|
||||
a failed <a href="#try"><tt>try</tt></a> call, returns <tt><b>nil</b></tt>
|
||||
followed by an error message.
|
||||
</p>
|
||||
|
||||
<!-- select +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="select">
|
||||
socket.<b>select(</b>recvt, sendt [, timeout]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Waits for a number of sockets to change status.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Recvt</tt> is an array with the sockets to test for characters
|
||||
available for reading. Sockets in the <tt>sendt</tt> array are watched to
|
||||
see if it is OK to immediately write on them. <tt>Timeout</tt> is the
|
||||
maximum amount of time (in seconds) to wait for a change in status. A
|
||||
<tt><b>nil</b></tt>, negative or omitted <tt>timeout</tt> value allows the
|
||||
function to block indefinitely. <tt>Recvt</tt> and <tt>sendt</tt> can also
|
||||
be empty tables or <tt><b>nil</b></tt>. Non-socket values (or values with
|
||||
non-numeric indices) in the arrays will be silently ignored.
|
||||
</p>
|
||||
|
||||
<p class="return"> The function returns a list with the sockets ready for
|
||||
reading, a list with the sockets ready for writing and an error message.
|
||||
The error message is "<tt>timeout</tt>" if a timeout
|
||||
condition was met, "<tt>select failed</tt>" if the call
|
||||
to <tt>select</tt> failed, and
|
||||
<tt><b>nil</b></tt> otherwise. The returned tables are
|
||||
doubly keyed both by integers and also by the sockets
|
||||
themselves, to simplify the test if a specific socket has
|
||||
changed status.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
<b>Note:</b> <tt>select</tt> can monitor a limited number
|
||||
of sockets, as defined by the constant <a href="#setsize">
|
||||
<tt>socket._SETSIZE</tt></a>. This
|
||||
number may be as high as 1024 or as low as 64 by default,
|
||||
depending on the system. It is usually possible to change this
|
||||
at compile time. Invoking <tt>select</tt> with a larger
|
||||
number of sockets will raise an error.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
<b>Important note</b>: a known bug in WinSock causes <tt>select</tt> to fail
|
||||
on non-blocking TCP sockets. The function may return a socket as
|
||||
writable even though the socket is <em>not</em> ready for sending.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
<b>Another important note</b>: calling select with a server socket in the receive parameter before a call to accept does <em>not</em> guarantee
|
||||
<a href="tcp.html#accept"><tt>accept</tt></a> will return immediately.
|
||||
Use the <a href="tcp.html#settimeout"><tt>settimeout</tt></a>
|
||||
method or <tt>accept</tt> might block forever.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
<b>Yet another note</b>: If you close a socket and pass
|
||||
it to <tt>select</tt>, it will be ignored.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
<b>Using select with non-socket objects</b>: Any object that implements <tt>getfd</tt> and <tt>dirty</tt> can be used with <tt>select</tt>, allowing objects from other libraries to be used within a <tt>socket.select</tt> driven loop.
|
||||
</p>
|
||||
|
||||
<!-- setsize ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="setsize">
|
||||
socket.<b>_SETSIZE</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
The maximum number of sockets that the <a
|
||||
href="#select"><tt>select</tt></a> function can handle.
|
||||
</p>
|
||||
|
||||
|
||||
<!-- sink ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="sink">
|
||||
socket.<b>sink(</b>mode, socket<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates an
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
|
||||
sink from a stream socket object.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Mode</tt> defines the behavior of the sink. The following
|
||||
options are available:
|
||||
</p>
|
||||
<ul>
|
||||
<li> <tt>"http-chunked"</tt>: sends data through socket after applying the
|
||||
<em>chunked transfer coding</em>, closing the socket when done;</li>
|
||||
<li> <tt>"close-when-done"</tt>: sends all received data through the
|
||||
socket, closing the socket when done;</li>
|
||||
<li> <tt>"keep-open"</tt>: sends all received data through the
|
||||
socket, leaving it open when done.</li>
|
||||
</ul>
|
||||
<p>
|
||||
<tt>Socket</tt> is the stream socket object used to send the data.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns a sink with the appropriate behavior.
|
||||
</p>
|
||||
|
||||
<!-- skip ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="skip">
|
||||
socket.<b>skip(</b>d [, ret<sub>1</sub>, ret<sub>2</sub> ... ret<sub>N</sub>]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Drops a number of arguments and returns the remaining.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>D</tt> is the number of arguments to drop. <tt>Ret<sub>1</sub></tt> to
|
||||
<tt>ret<sub>N</sub></tt> are the arguments.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns <tt>ret<sub>d+1</sub></tt> to <tt>ret<sub>N</sub></tt>.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: This function is useful to avoid creation of dummy variables:
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- get the status code and separator from SMTP server reply
|
||||
local code, sep = socket.skip(2, string.find(line, "^(%d%d%d)(.?)"))
|
||||
</pre>
|
||||
|
||||
<!-- sleep ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="sleep">
|
||||
socket.<b>sleep(</b>time<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Freezes the program execution during a given amount of time.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Time</tt> is the number of seconds to sleep for. If
|
||||
<tt>time</tt> is negative, the function returns immediately.
|
||||
</p>
|
||||
|
||||
<!-- source +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="source">
|
||||
socket.<b>source(</b>mode, socket [, length]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates an
|
||||
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
|
||||
source from a stream socket object.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Mode</tt> defines the behavior of the source. The following
|
||||
options are available:
|
||||
</p>
|
||||
<ul>
|
||||
<li> <tt>"http-chunked"</tt>: receives data from socket and removes the
|
||||
<em>chunked transfer coding</em> before returning the data;</li>
|
||||
<li> <tt>"by-length"</tt>: receives a fixed number of bytes from the
|
||||
socket. This mode requires the extra argument <tt>length</tt>;</li>
|
||||
<li> <tt>"until-closed"</tt>: receives data from a socket until the other
|
||||
side closes the connection.</li>
|
||||
</ul>
|
||||
<p>
|
||||
<tt>Socket</tt> is the stream socket object used to receive the data.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns a source with the appropriate behavior.
|
||||
</p>
|
||||
|
||||
<!-- socketinvalid ++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="socketinvalid">
|
||||
socket.<b>_SOCKETINVALID</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
The OS value for an invalid socket. This can be used with <a href="tcp.html#getfd">
|
||||
<tt>tcp:getfd</tt></a> and <a href="tcp.html#setfd"><tt>tcp:setfd</tt></a> methods.
|
||||
</p>
|
||||
|
||||
<!-- try ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="try">
|
||||
socket.<b>try(</b>ret<sub>1</sub> [, ret<sub>2</sub> ... ret<sub>N</sub>]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Throws an exception in case <tt>ret<sub>1</sub></tt> is falsy, using
|
||||
<tt>ret<sub>2</sub></tt> as the error message. The exception is supposed to be caught
|
||||
by a <a href="#protect"><tt>protect</tt></a>ed function only.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Ret<sub>1</sub></tt> to <tt>ret<sub>N</sub></tt> can be arbitrary
|
||||
arguments, but are usually the return values of a function call
|
||||
nested with <tt>try</tt>.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The function returns <tt>ret</tt><sub>1</sub> to <tt>ret</tt><sub>N</sub> if
|
||||
<tt>ret</tt><sub>1</sub> is not <tt><b>nil</b></tt> or <tt><b>false</b></tt>.
|
||||
Otherwise, it calls <tt>error</tt> passing <tt>ret</tt><sub>2</sub> wrapped
|
||||
in a table with metatable used by <a href="#protect"><tt>protect</tt></a> to
|
||||
distinguish exceptions from runtime errors.
|
||||
</p>
|
||||
|
||||
<pre class="example">
|
||||
-- connects or throws an exception with the appropriate error message
|
||||
c = socket.try(socket.connect("localhost", 80))
|
||||
</pre>
|
||||
|
||||
<!-- version ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="version">
|
||||
socket.<b>_VERSION</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
This constant has a string describing the current LuaSocket version.
|
||||
</p>
|
||||
|
||||
<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="footer">
|
||||
<hr>
|
||||
<center>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#down">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
<p>
|
||||
<small>
|
||||
Last modified by Diego Nehab on <br>
|
||||
Thu Apr 20 00:25:54 EDT 2006
|
||||
</small>
|
||||
</p>
|
||||
</center>
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,738 @@
|
|||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
||||
"http://www.w3.org/TR/html4/strict.dtd">
|
||||
<html>
|
||||
|
||||
<head>
|
||||
<meta name="description" content="LuaSocket: The TCP/IP support">
|
||||
<meta name="keywords" content="Lua, LuaSocket, Socket, TCP, Library, Network, Support">
|
||||
<title>LuaSocket: TCP/IP support</title>
|
||||
<link rel="stylesheet" href="reference.css" type="text/css">
|
||||
</head>
|
||||
|
||||
<body>
|
||||
|
||||
<!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="header">
|
||||
<hr>
|
||||
<center>
|
||||
<table summary="LuaSocket logo">
|
||||
<tr><td align="center"><a href="http://www.lua.org">
|
||||
<img width="128" height="128" border="0" alt="LuaSocket" src="luasocket.png">
|
||||
</a></td></tr>
|
||||
<tr><td align="center" valign="top">Network support for the Lua language
|
||||
</td></tr>
|
||||
</table>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
</center>
|
||||
<hr>
|
||||
</div>
|
||||
|
||||
<!-- tcp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2 id="tcp">TCP</h2>
|
||||
|
||||
<!-- accept +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="accept">
|
||||
server:<b>accept()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Waits for a remote connection on the server
|
||||
object and returns a client object representing that connection.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
If a connection is successfully initiated, a client object is returned.
|
||||
If a timeout condition is met, the method returns <b><tt>nil</tt></b>
|
||||
followed by the error string '<tt>timeout</tt>'. Other errors are
|
||||
reported by <b><tt>nil</tt></b> followed by a message describing the error.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: calling <a href="socket.html#select"><tt>socket.select</tt></a>
|
||||
with a server object in
|
||||
the <tt>recvt</tt> parameter before a call to <tt>accept</tt> does
|
||||
<em>not</em> guarantee <tt>accept</tt> will return immediately. Use the <a
|
||||
href="#settimeout"><tt>settimeout</tt></a> method or <tt>accept</tt>
|
||||
might block until <em>another</em> client shows up.
|
||||
</p>
|
||||
|
||||
<!-- bind +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="bind">
|
||||
master:<b>bind(</b>address, port<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Binds a master object to <tt>address</tt> and <tt>port</tt> on the
|
||||
local host.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Address</tt> can be an IP address or a host name.
|
||||
<tt>Port</tt> must be an integer number in the range [0..64K).
|
||||
If <tt>address</tt>
|
||||
is '<tt>*</tt>', the system binds to all local interfaces
|
||||
using the <tt>INADDR_ANY</tt> constant or
|
||||
<tt>IN6ADDR_ANY_INIT</tt>, according to the family.
|
||||
If <tt>port</tt> is 0, the system automatically
|
||||
chooses an ephemeral port.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
In case of success, the method returns 1. In case of error, the
|
||||
method returns <b><tt>nil</tt></b> followed by an error message.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The function <a href="socket.html#bind"><tt>socket.bind</tt></a>
|
||||
is available and is a shortcut for the creation of server sockets.
|
||||
</p>
|
||||
|
||||
<!-- close ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="close">
|
||||
master:<b>close()</b><br>
|
||||
client:<b>close()</b><br>
|
||||
server:<b>close()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Closes a TCP object. The internal socket used by the object is closed
|
||||
and the local address to which the object was
|
||||
bound is made available to other applications. No further operations
|
||||
(except for further calls to the <tt>close</tt> method) are allowed on
|
||||
a closed socket.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: It is important to close all used sockets once they are not
|
||||
needed, since, in many systems, each socket uses a file descriptor,
|
||||
which are limited system resources. Garbage-collected objects are
|
||||
automatically closed before destruction, though.
|
||||
</p>
|
||||
|
||||
<!-- connect ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="connect">
|
||||
master:<b>connect(</b>address, port<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Attempts to connect a master object to a remote host, transforming it into a
|
||||
client object.
|
||||
Client objects support methods
|
||||
<a href="#send"><tt>send</tt></a>,
|
||||
<a href="#receive"><tt>receive</tt></a>,
|
||||
<a href="#getsockname"><tt>getsockname</tt></a>,
|
||||
<a href="#getpeername"><tt>getpeername</tt></a>,
|
||||
<a href="#settimeout"><tt>settimeout</tt></a>,
|
||||
and <a href="#close"><tt>close</tt></a>.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Address</tt> can be an IP address or a host name.
|
||||
<tt>Port</tt> must be an integer number in the range [1..64K).
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
In case of error, the method returns <b><tt>nil</tt></b> followed by a string
|
||||
describing the error. In case of success, the method returns 1.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The function <a href="socket.html#connect"><tt>socket.connect</tt></a>
|
||||
is available and is a shortcut for the creation of client sockets.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: Starting with LuaSocket 2.0,
|
||||
the <a href="#settimeout"><tt>settimeout</tt></a>
|
||||
method affects the behavior of <tt>connect</tt>, causing it to return
|
||||
with an error in case of a timeout. If that happens, you can still call <a
|
||||
href="socket.html#select"><tt>socket.select</tt></a> with the socket in the
|
||||
<tt>sendt</tt> table. The socket will be writable when the connection is
|
||||
established.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: Starting with LuaSocket 3.0, the host name resolution
|
||||
depends on whether the socket was created by
|
||||
<a href="#socket.tcp"><tt>socket.tcp</tt></a>,
|
||||
<a href="#socket.tcp4"><tt>socket.tcp4</tt></a> or
|
||||
<a href="#socket.tcp6"><tt>socket.tcp6</tt></a>. Addresses from
|
||||
the appropriate family (or both) are tried in the order
|
||||
returned by the resolver until the
|
||||
first success or until the last failure. If the timeout was
|
||||
set to zero, only the first address is tried.
|
||||
</p>
|
||||
|
||||
<!-- dirty +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="dirty">
|
||||
master:<b>dirty()</b><br>
|
||||
client:<b>dirty()</b><br>
|
||||
server:<b>dirty()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Check the read buffer status.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
Returns <tt>true</tt> if there is any data in the read buffer, <tt>false</tt> otherwise.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: <b>This is an internal method, use at your own risk.</b>
|
||||
</p>
|
||||
|
||||
|
||||
<!-- getfd +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="getfd">
|
||||
master:<b>getfd()</b><br>
|
||||
client:<b>getfd()</b><br>
|
||||
server:<b>getfd()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns the underling socket descriptor or handle associated to the object.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The descriptor or handle. In case the object has been closed, the return value
|
||||
will be -1. For an invalid socket it will be <a href="socket.html#socketinvalid">
|
||||
<tt>_SOCKETINVALID</tt></a>.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: <b>This is an internal method. Unlikely to be
|
||||
portable. Use at your own risk. </b>
|
||||
</p>
|
||||
|
||||
|
||||
<!-- getoption ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="getoption">
|
||||
client:<b>getoption(option)</b><br>
|
||||
server:<b>getoption(option)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Gets options for the TCP object.
|
||||
See <a href="#setoption"><tt>setoption</tt></a> for description of the
|
||||
option names and values.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Option</tt> is a string with the option name.</p>
|
||||
<ul>
|
||||
<li> '<tt>keepalive</tt>'</li>
|
||||
<li> '<tt>linger</tt>'</li>
|
||||
<li> '<tt>reuseaddr</tt>'</li>
|
||||
<li> '<tt>tcp-nodelay</tt>'</li>
|
||||
</ul>
|
||||
|
||||
<p class="return">
|
||||
The method returns the option <tt>value</tt> in case of success, or
|
||||
<b><tt>nil</tt></b> followed by an error message otherwise.
|
||||
</p>
|
||||
|
||||
|
||||
<!-- getpeername ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="getpeername">
|
||||
client:<b>getpeername()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns information about the remote side of a connected client object.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
Returns a string with the IP address of the peer, the
|
||||
port number that peer is using for the connection,
|
||||
and a string with the family ("<tt>inet</tt>" or "<tt>inet6</tt>").
|
||||
In case of error, the method returns <b><tt>nil</tt></b>.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: It makes no sense to call this method on server objects.
|
||||
</p>
|
||||
|
||||
<!-- getsockname ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="getsockname">
|
||||
master:<b>getsockname()</b><br>
|
||||
client:<b>getsockname()</b><br>
|
||||
server:<b>getsockname()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns the local address information associated to the object.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The method returns a string with local IP address, a number with
|
||||
the local port,
|
||||
and a string with the family ("<tt>inet</tt>" or "<tt>inet6</tt>").
|
||||
In case of error, the method returns <b><tt>nil</tt></b>.
|
||||
</p>
|
||||
|
||||
<!-- getstats +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="getstats">
|
||||
master:<b>getstats()</b><br>
|
||||
client:<b>getstats()</b><br>
|
||||
server:<b>getstats()</b><br>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns accounting information on the socket, useful for throttling
|
||||
of bandwidth.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The method returns the number of bytes received, the number of bytes sent,
|
||||
and the age of the socket object in seconds.
|
||||
</p>
|
||||
|
||||
<!-- gettimeout +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="gettimeout">
|
||||
master:<b>gettimeout()</b><br>
|
||||
client:<b>gettimeout()</b><br>
|
||||
server:<b>gettimeout()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns the current block timeout followed by the curent
|
||||
total timeout.
|
||||
</p>
|
||||
|
||||
|
||||
<!-- listen ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="listen">
|
||||
master:<b>listen(</b>backlog<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Specifies the socket is willing to receive connections, transforming the
|
||||
object into a server object. Server objects support the
|
||||
<a href="#accept"><tt>accept</tt></a>,
|
||||
<a href="#getsockname"><tt>getsockname</tt></a>,
|
||||
<a href="#setoption"><tt>setoption</tt></a>,
|
||||
<a href="#settimeout"><tt>settimeout</tt></a>,
|
||||
and <a href="#close"><tt>close</tt></a> methods.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
The parameter <tt>backlog</tt> specifies the number of client
|
||||
connections that can
|
||||
be queued waiting for service. If the queue is full and another client
|
||||
attempts connection, the connection is refused.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
In case of success, the method returns 1. In case of error, the
|
||||
method returns <b><tt>nil</tt></b> followed by an error message.
|
||||
</p>
|
||||
|
||||
<!-- receive ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="receive">
|
||||
client:<b>receive(</b>[pattern [, prefix]]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Reads data from a client object, according to the specified <em>read
|
||||
pattern</em>. Patterns follow the Lua file I/O format, and the difference in performance between all patterns is negligible.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Pattern</tt> can be any of the following:
|
||||
</p>
|
||||
|
||||
<ul>
|
||||
<li> '<tt>*a</tt>': reads from the socket until the connection is
|
||||
closed. No end-of-line translation is performed;</li>
|
||||
<li> '<tt>*l</tt>': reads a line of text from the socket. The line is
|
||||
terminated by a LF character (ASCII 10), optionally preceded by a
|
||||
CR character (ASCII 13). The CR and LF characters are not included in
|
||||
the returned line. In fact, <em>all</em> CR characters are
|
||||
ignored by the pattern. This is the default pattern;</li>
|
||||
<li> <tt>number</tt>: causes the method to read a specified <tt>number</tt>
|
||||
of bytes from the socket.</li>
|
||||
</ul>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Prefix</tt> is an optional string to be concatenated to the beginning
|
||||
of any received data before return.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
If successful, the method returns the received pattern. In case of error,
|
||||
the method returns <tt><b>nil</b></tt> followed by an error
|
||||
message, followed by a (possibly empty) string containing
|
||||
the partial that was received. The error message can be
|
||||
the string '<tt>closed</tt>' in case the connection was
|
||||
closed before the transmission was completed or the string
|
||||
'<tt>timeout</tt>' in case there was a timeout during the operation.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
<b>Important note</b>: This function was changed <em>severely</em>. It used
|
||||
to support multiple patterns (but I have never seen this feature used) and
|
||||
now it doesn't anymore. Partial results used to be returned in the same
|
||||
way as successful results. This last feature violated the idea that all
|
||||
functions should return <tt><b>nil</b></tt> on error. Thus it was changed
|
||||
too.
|
||||
</p>
|
||||
|
||||
<!-- send +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="send">
|
||||
client:<b>send(</b>data [, i [, j]]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Sends <tt>data</tt> through client object.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Data</tt> is the string to be sent. The optional arguments
|
||||
<tt>i</tt> and <tt>j</tt> work exactly like the standard
|
||||
<tt>string.sub</tt> Lua function to allow the selection of a
|
||||
substring to be sent.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
If successful, the method returns the index of the last byte
|
||||
within <tt>[i, j]</tt> that has been sent. Notice that, if
|
||||
<tt>i</tt> is 1 or absent, this is effectively the total
|
||||
number of bytes sent. In case of error, the method returns
|
||||
<b><tt>nil</tt></b>, followed by an error message, followed
|
||||
by the index of the last byte within <tt>[i, j]</tt> that
|
||||
has been sent. You might want to try again from the byte
|
||||
following that. The error message can be '<tt>closed</tt>'
|
||||
in case the connection was closed before the transmission
|
||||
was completed or the string '<tt>timeout</tt>' in case
|
||||
there was a timeout during the operation.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: Output is <em>not</em> buffered. For small strings,
|
||||
it is always better to concatenate them in Lua
|
||||
(with the '<tt>..</tt>' operator) and send the result in one call
|
||||
instead of calling the method several times.
|
||||
</p>
|
||||
|
||||
<!-- setoption ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="setoption">
|
||||
client:<b>setoption(</b>option [, value]<b>)</b><br>
|
||||
server:<b>setoption(</b>option [, value]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Sets options for the TCP object. Options are only needed by low-level or
|
||||
time-critical applications. You should only modify an option if you
|
||||
are sure you need it.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Option</tt> is a string with the option name, and <tt>value</tt>
|
||||
depends on the option being set:</p>
|
||||
|
||||
<ul>
|
||||
|
||||
<li> '<tt>keepalive</tt>': Setting this option to <tt>true</tt> enables
|
||||
the periodic transmission of messages on a connected socket. Should the
|
||||
connected party fail to respond to these messages, the connection is
|
||||
considered broken and processes using the socket are notified;</li>
|
||||
|
||||
<li> '<tt>linger</tt>': Controls the action taken when unsent data are
|
||||
queued on a socket and a close is performed. The value is a table with a
|
||||
boolean entry '<tt>on</tt>' and a numeric entry for the time interval
|
||||
'<tt>timeout</tt>' in seconds. If the '<tt>on</tt>' field is set to
|
||||
<tt>true</tt>, the system will block the process on the close attempt until
|
||||
it is able to transmit the data or until '<tt>timeout</tt>' has passed. If
|
||||
'<tt>on</tt>' is <tt>false</tt> and a close is issued, the system will
|
||||
process the close in a manner that allows the process to continue as
|
||||
quickly as possible. I do not advise you to set this to anything other than
|
||||
zero;</li>
|
||||
|
||||
<li> '<tt>reuseaddr</tt>': Setting this option indicates that the rules
|
||||
used in validating addresses supplied in a call to
|
||||
<a href="#bind"><tt>bind</tt></a> should allow reuse of local addresses;</li>
|
||||
|
||||
<li> '<tt>tcp-nodelay</tt>': Setting this option to <tt>true</tt>
|
||||
disables the Nagle's algorithm for the connection;</li>
|
||||
|
||||
<li> '<tt>tcp-keepidle</tt>': value in seconds for <tt>TCP_KEEPIDLE</tt> Linux only!!</li>
|
||||
|
||||
<li> '<tt>tcp-keepcnt</tt>': value for <tt>TCP_KEEPCNT</tt> Linux only!!</li>
|
||||
|
||||
<li> '<tt>tcp-keepintvl</tt>': value for <tt>TCP_KEEPINTVL</tt> Linux only!!</li>
|
||||
|
||||
<li> '<tt>tcp-defer-accept</tt>': value for <tt>TCP_DEFER_ACCEPT</tt> Linux only!!</li>
|
||||
|
||||
<li> '<tt>tcp-fastopen</tt>': value for <tt>TCP_FASTOPEN</tt> Linux only!!</li>
|
||||
|
||||
<li> '<tt>tcp-fastopen-connect</tt>': value for <tt>TCP_FASTOPEN_CONNECT</tt> Linux only!!</li>
|
||||
|
||||
<li> '<tt>ipv6-v6only</tt>':
|
||||
Setting this option to <tt>true</tt> restricts an <tt>inet6</tt> socket to
|
||||
sending and receiving only IPv6 packets.</li>
|
||||
</ul>
|
||||
|
||||
<p class="return">
|
||||
The method returns 1 in case of success, or <b><tt>nil</tt></b>
|
||||
followed by an error message otherwise.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The descriptions above come from the man pages.
|
||||
</p>
|
||||
|
||||
<!-- setstats +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="setstats">
|
||||
master:<b>setstats(</b>received, sent, age<b>)</b><br>
|
||||
client:<b>setstats(</b>received, sent, age<b>)</b><br>
|
||||
server:<b>setstats(</b>received, sent, age<b>)</b><br>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Resets accounting information on the socket, useful for throttling
|
||||
of bandwidth.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Received</tt> is a number with the new number of bytes received.
|
||||
<tt>Sent</tt> is a number with the new number of bytes sent.
|
||||
<tt>Age</tt> is the new age in seconds.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The method returns 1 in case of success and <tt><b>nil</b></tt> otherwise.
|
||||
</p>
|
||||
|
||||
<!-- settimeout +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="settimeout">
|
||||
master:<b>settimeout(</b>value [, mode]<b>)</b><br>
|
||||
client:<b>settimeout(</b>value [, mode]<b>)</b><br>
|
||||
server:<b>settimeout(</b>value [, mode]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Changes the timeout values for the object. By default,
|
||||
all I/O operations are blocking. That is, any call to the methods
|
||||
<a href="#send"><tt>send</tt></a>,
|
||||
<a href="#receive"><tt>receive</tt></a>, and
|
||||
<a href="#accept"><tt>accept</tt></a>
|
||||
will block indefinitely, until the operation completes. The
|
||||
<tt>settimeout</tt> method defines a limit on the amount of time the
|
||||
I/O methods can block. When a timeout is set and the specified amount of
|
||||
time has elapsed, the affected methods give up and fail with an error code.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
The amount of time to wait is specified as the
|
||||
<tt>value</tt> parameter, in seconds. There are two timeout modes and
|
||||
both can be used together for fine tuning:
|
||||
</p>
|
||||
|
||||
<ul>
|
||||
<li> '<tt>b</tt>': <em>block</em> timeout. Specifies the upper limit on
|
||||
the amount of time LuaSocket can be blocked by the operating system
|
||||
while waiting for completion of any single I/O operation. This is the
|
||||
default mode;</li>
|
||||
|
||||
<li> '<tt>t</tt>': <em>total</em> timeout. Specifies the upper limit on
|
||||
the amount of time LuaSocket can block a Lua script before returning from
|
||||
a call.</li>
|
||||
</ul>
|
||||
|
||||
<p class="parameters">
|
||||
The <b><tt>nil</tt></b> timeout <tt>value</tt> allows operations to block
|
||||
indefinitely. Negative timeout values have the same effect.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: although timeout values have millisecond precision in LuaSocket,
|
||||
large blocks can cause I/O functions not to respect timeout values due
|
||||
to the time the library takes to transfer blocks to and from the OS
|
||||
and to and from the Lua interpreter. Also, function that accept host names
|
||||
and perform automatic name resolution might be blocked by the resolver for
|
||||
longer than the specified timeout value.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The old <tt>timeout</tt> method is deprecated. The name has been
|
||||
changed for sake of uniformity, since all other method names already
|
||||
contained verbs making their imperative nature obvious.
|
||||
</p>
|
||||
|
||||
<!-- shutdown +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="shutdown">
|
||||
client:<b>shutdown(</b>mode<b>)</b><br>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Shuts down part of a full-duplex connection.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
Mode tells which way of the connection should be shut down and can
|
||||
take the value:
|
||||
<ul>
|
||||
<li>"<tt>both</tt>": disallow further sends and receives on the object.
|
||||
This is the default mode;</li>
|
||||
<li>"<tt>send</tt>": disallow further sends on the object;</li>
|
||||
<li>"<tt>receive</tt>": disallow further receives on the object.</li>
|
||||
</ul>
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
This function returns 1.
|
||||
</p>
|
||||
|
||||
<!-- setfd +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="setfd">
|
||||
master:<b>setfd(</b>fd<b>)</b><br>
|
||||
client:<b>setfd(</b>fd<b>)</b><br>
|
||||
server:<b>setfd(</b>fd<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Sets the underling socket descriptor or handle associated to the object. The current one
|
||||
is simply replaced, not closed, and no other change to the object state is made.
|
||||
To set it as invalid use <a href="socket.html#socketinvalid"><tt>_SOCKETINVALID</tt></a>.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
No return value.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: <b>This is an internal method. Unlikely to be
|
||||
portable. Use at your own risk. </b>
|
||||
</p>
|
||||
|
||||
<!-- socket.tcp +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="socket.tcp">
|
||||
socket.<b>tcp()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns an TCP master object. A master object can
|
||||
be transformed into a server object with the method
|
||||
<a href="#listen"><tt>listen</tt></a> (after a call to <a
|
||||
href="#bind"><tt>bind</tt></a>) or into a client object with
|
||||
the method <a href="#connect"><tt>connect</tt></a>. The only other
|
||||
method supported by a master object is the
|
||||
<a href="#close"><tt>close</tt></a> method.</p>
|
||||
|
||||
<p class="return">
|
||||
In case of success, a new master object is returned. In case of error,
|
||||
<b><tt>nil</tt></b> is returned, followed by an error message.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The choice between IPv4 and IPv6 happens during a call to
|
||||
<a href="#bind"><tt>bind</tt></a> or <a
|
||||
href="#bind"><tt>connect</tt></a>, depending on the address
|
||||
family obtained from the resolver.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: Before the choice between IPv4 and IPv6 happens,
|
||||
the internal socket object is invalid and therefore <a
|
||||
href="#setoption"><tt>setoption</tt></a> will fail.
|
||||
</p>
|
||||
|
||||
<!-- socket.tcp +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="socket.tcp4">
|
||||
socket.<b>tcp4()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns an IPv4 TCP master object. A master object can
|
||||
be transformed into a server object with the method
|
||||
<a href="#listen"><tt>listen</tt></a> (after a call to <a
|
||||
href="#bind"><tt>bind</tt></a>) or into a client object with
|
||||
the method <a href="#connect"><tt>connect</tt></a>. The only other
|
||||
method supported by a master object is the
|
||||
<a href="#close"><tt>close</tt></a> method.</p>
|
||||
|
||||
<p class="return">
|
||||
In case of success, a new master object is returned. In case of error,
|
||||
<b><tt>nil</tt></b> is returned, followed by an error message.
|
||||
</p>
|
||||
|
||||
<!-- socket.tcp6 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="socket.tcp6">
|
||||
socket.<b>tcp6()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns an IPv6 TCP master object. A master object can
|
||||
be transformed into a server object with the method
|
||||
<a href="#listen"><tt>listen</tt></a> (after a call to <a
|
||||
href="#bind"><tt>bind</tt></a>) or into a client object with
|
||||
the method <a href="#connect"><tt>connect</tt></a>. The only other
|
||||
method supported by a master object is the
|
||||
<a href="#close"><tt>close</tt></a> method.</p>
|
||||
|
||||
<p class="return">
|
||||
In case of success, a new master object is returned. In case of error,
|
||||
<b><tt>nil</tt></b> is returned, followed by an error message.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The TCP object returned will have the option
|
||||
"<tt>ipv6-v6only</tt>" set to <tt><b>true</b></tt>.
|
||||
</p>
|
||||
|
||||
|
||||
|
||||
<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="footer">
|
||||
<hr>
|
||||
<center>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#down">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
<p>
|
||||
<small>
|
||||
Last modified by Diego Nehab on <br>
|
||||
Thu Apr 20 00:25:57 EDT 2006
|
||||
</small>
|
||||
</p>
|
||||
</center>
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,596 @@
|
|||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
||||
"http://www.w3.org/TR/html4/strict.dtd">
|
||||
<html>
|
||||
|
||||
<head>
|
||||
<meta name="description" content="LuaSocket: The UDP support">
|
||||
<meta name="keywords" content="Lua, LuaSocket, Socket, UDP, Library, Network, Support">
|
||||
<title>LuaSocket: UDP support</title>
|
||||
<link rel="stylesheet" href="reference.css" type="text/css">
|
||||
</head>
|
||||
|
||||
<body>
|
||||
|
||||
<!-- header ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="header">
|
||||
<hr>
|
||||
<center>
|
||||
<table summary="LuaSocket logo">
|
||||
<tr><td align="center"><a href="http://www.lua.org">
|
||||
<img width="128" height="128" border="0" alt="LuaSocket" src="luasocket.png">
|
||||
</a></td></tr>
|
||||
<tr><td align="center" valign="top">Network support for the Lua language
|
||||
</td></tr>
|
||||
</table>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
</center>
|
||||
<hr>
|
||||
</div>
|
||||
|
||||
|
||||
<!-- udp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2 id="udp">UDP</h2>
|
||||
|
||||
<!-- close +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="close">
|
||||
connected:<b>close()</b><br>
|
||||
unconnected:<b>close()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Closes a UDP object. The internal socket
|
||||
used by the object is closed and the local address to which the
|
||||
object was bound is made available to other applications. No
|
||||
further operations (except for further calls to the <tt>close</tt>
|
||||
method) are allowed on a closed socket.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: It is important to close all used sockets
|
||||
once they are not needed, since, in many systems, each socket uses
|
||||
a file descriptor, which are limited system resources.
|
||||
Garbage-collected objects are automatically closed before
|
||||
destruction, though.
|
||||
</p>
|
||||
|
||||
<!-- getoption +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="getoption">
|
||||
connected:<b>getoption()</b><br>
|
||||
unconnected:<b>getoption()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Gets an option value from the UDP object.
|
||||
See <a href="#setoption"><tt>setoption</tt></a> for
|
||||
description of the option names and values.
|
||||
</p>
|
||||
|
||||
<p class="parameters"><tt>Option</tt> is a string with the option name.
|
||||
<ul>
|
||||
<li> '<tt>dontroute</tt>'</li>
|
||||
<li> '<tt>broadcast</tt>'</li>
|
||||
<li> '<tt>reuseaddr</tt>'</li>
|
||||
<li> '<tt>reuseport</tt>'</li>
|
||||
<li> '<tt>ip-multicast-loop</tt>'</li>
|
||||
<li> '<tt>ipv6-v6only</tt>'</li>
|
||||
<li> '<tt>ip-multicast-if</tt>'</li>
|
||||
<li> '<tt>ip-multicast-ttl</tt>'</li>
|
||||
<li> '<tt>ip-add-membership</tt>'</li>
|
||||
<li> '<tt>ip-drop-membership</tt>'</li>
|
||||
</ul>
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
The method returns the option <tt>value</tt> in case of
|
||||
success, or
|
||||
<b><tt>nil</tt></b> followed by an error message otherwise.
|
||||
</p>
|
||||
|
||||
<!-- getpeername +++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="getpeername">
|
||||
connected:<b>getpeername()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Retrieves information about the peer
|
||||
associated with a connected UDP object.
|
||||
</p>
|
||||
|
||||
|
||||
<p class="return">
|
||||
Returns a string with the IP address of the peer, the
|
||||
port number that peer is using for the connection,
|
||||
and a string with the family ("<tt>inet</tt>" or "<tt>inet6</tt>").
|
||||
In case of error, the method returns <b><tt>nil</tt></b>.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: It makes no sense to call this method on unconnected objects.
|
||||
</p>
|
||||
|
||||
<!-- getsockname +++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="getsockname">
|
||||
connected:<b>getsockname()</b><br>
|
||||
unconnected:<b>getsockname()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns the local address information associated to the object.
|
||||
</p>
|
||||
|
||||
|
||||
<p class="return">
|
||||
The method returns a string with local IP address, a number with
|
||||
the local port,
|
||||
and a string with the family ("<tt>inet</tt>" or "<tt>inet6</tt>").
|
||||
In case of error, the method returns <b><tt>nil</tt></b>.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: UDP sockets are not bound to any address
|
||||
until the <a href="#setsockname"><tt>setsockname</tt></a> or the
|
||||
<a href="#sendto"><tt>sendto</tt></a> method is called for the
|
||||
first time (in which case it is bound to an ephemeral port and the
|
||||
wild-card address).
|
||||
</p>
|
||||
|
||||
<!-- gettimeout +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="gettimeout">
|
||||
connected:<b>settimeout(</b>value<b>)</b><br>
|
||||
unconnected:<b>settimeout(</b>value<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Returns the current timeout value.
|
||||
</p>
|
||||
|
||||
|
||||
<!-- receive +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="receive">
|
||||
connected:<b>receive(</b>[size]<b>)</b><br>
|
||||
unconnected:<b>receive(</b>[size]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Receives a datagram from the UDP object. If
|
||||
the UDP object is connected, only datagrams coming from the peer
|
||||
are accepted. Otherwise, the returned datagram can come from any
|
||||
host.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
The optional <tt>size</tt> parameter
|
||||
specifies the maximum size of the datagram to be retrieved. If
|
||||
there are more than <tt>size</tt> bytes available in the datagram,
|
||||
the excess bytes are discarded. If there are less then
|
||||
<tt>size</tt> bytes available in the current datagram, the
|
||||
available bytes are returned.
|
||||
If <tt>size</tt> is omitted, the
|
||||
compile-time constant <a href="socket.html#datagramsize">
|
||||
<tt>socket._DATAGRAMSIZE</tt></a> is used
|
||||
(it defaults to 8192 bytes). Larger sizes will cause a
|
||||
temporary buffer to be allocated for the operation.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
In case of success, the method returns the
|
||||
received datagram. In case of timeout, the method returns
|
||||
<b><tt>nil</tt></b> followed by the string '<tt>timeout</tt>'.
|
||||
</p>
|
||||
|
||||
<!-- receivefrom +++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="receivefrom">
|
||||
unconnected:<b>receivefrom(</b>[size]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Works exactly as the <a href="#receive"><tt>receive</tt></a>
|
||||
method, except it returns the IP
|
||||
address and port as extra return values (and is therefore slightly less
|
||||
efficient).
|
||||
</p>
|
||||
|
||||
<!-- send ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="send">
|
||||
connected:<b>send(</b>datagram<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Sends a datagram to the UDP peer of a connected object.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Datagram</tt> is a string with the datagram contents.
|
||||
The maximum datagram size for UDP is 64K minus IP layer overhead.
|
||||
However datagrams larger than the link layer packet size will be
|
||||
fragmented, which may deteriorate performance and/or reliability.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
If successful, the method returns 1. In case of
|
||||
error, the method returns <b><tt>nil</tt></b> followed by an error message.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: In UDP, the <tt>send</tt> method never blocks
|
||||
and the only way it can fail is if the underlying transport layer
|
||||
refuses to send a message to the specified address (i.e. no
|
||||
interface accepts the address).
|
||||
</p>
|
||||
|
||||
<!-- sendto ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="sendto">
|
||||
unconnected:<b>sendto(</b>datagram, ip, port<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Sends a datagram to the specified IP address and port number.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Datagram</tt> is a string with the
|
||||
datagram contents.
|
||||
The maximum datagram size for UDP is 64K minus IP layer overhead.
|
||||
However datagrams larger than the link layer packet size will be
|
||||
fragmented, which may deteriorate performance and/or reliability.
|
||||
<tt>Ip</tt> is the IP address of the recipient.
|
||||
Host names are <em>not</em> allowed for performance reasons.
|
||||
|
||||
<tt>Port</tt> is the port number at the recipient.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
If successful, the method returns 1. In case of
|
||||
error, the method returns <b><tt>nil</tt></b> followed by an error message.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: In UDP, the <tt>send</tt> method never blocks
|
||||
and the only way it can fail is if the underlying transport layer
|
||||
refuses to send a message to the specified address (i.e. no
|
||||
interface accepts the address).
|
||||
</p>
|
||||
|
||||
<!-- setoption +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="setoption">
|
||||
connected:<b>setoption(</b>option [, value]<b>)</b><br>
|
||||
unconnected:<b>setoption(</b>option [, value]<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Sets options for the UDP object. Options are
|
||||
only needed by low-level or time-critical applications. You should
|
||||
only modify an option if you are sure you need it.</p>
|
||||
<p class="parameters"><tt>Option</tt> is a string with the option
|
||||
name, and <tt>value</tt> depends on the option being set:
|
||||
</p>
|
||||
|
||||
<ul>
|
||||
<li> '<tt>dontroute</tt>': Indicates that outgoing
|
||||
messages should bypass the standard routing facilities.
|
||||
Receives a boolean value;</li>
|
||||
<li> '<tt>broadcast</tt>': Requests permission to send
|
||||
broadcast datagrams on the socket.
|
||||
Receives a boolean value;</li>
|
||||
<li> '<tt>reuseaddr</tt>': Indicates that the rules used in
|
||||
validating addresses supplied in a <tt>bind()</tt> call
|
||||
should allow reuse of local addresses.
|
||||
Receives a boolean value;</li>
|
||||
<li> '<tt>reuseport</tt>': Allows completely duplicate
|
||||
bindings by multiple processes if they all set
|
||||
'<tt>reuseport</tt>' before binding the port.
|
||||
Receives a boolean value;</li>
|
||||
<li> '<tt>ip-multicast-loop</tt>':
|
||||
Specifies whether or not a copy of an outgoing multicast
|
||||
datagram is delivered to the sending host as long as it is a
|
||||
member of the multicast group.
|
||||
Receives a boolean value;</li>
|
||||
<li> '<tt>ipv6-v6only</tt>':
|
||||
Specifies whether to restrict <tt>inet6</tt> sockets to
|
||||
sending and receiving only IPv6 packets.
|
||||
Receive a boolean value;</li>
|
||||
<li> '<tt>ip-multicast-if</tt>':
|
||||
Sets the interface over which outgoing multicast datagrams
|
||||
are sent.
|
||||
Receives an IP address;</li>
|
||||
<li> '<tt>ip-multicast-ttl</tt>':
|
||||
Sets the Time To Live in the IP header for outgoing
|
||||
multicast datagrams.
|
||||
Receives a number;</li>
|
||||
<li> '<tt>ip-add-membership</tt>':
|
||||
Joins the multicast group specified.
|
||||
Receives a table with fields
|
||||
<tt>multiaddr</tt> and <tt>interface</tt>, each containing an
|
||||
IP address;</li>
|
||||
<li> '<tt>ip-drop-membership</tt>': Leaves the multicast
|
||||
group specified.
|
||||
Receives a table with fields
|
||||
<tt>multiaddr</tt> and <tt>interface</tt>, each containing an
|
||||
IP address.</li>
|
||||
</ul>
|
||||
|
||||
<p class="return">
|
||||
The method returns 1 in case of success, or
|
||||
<b><tt>nil</tt></b> followed by an error message otherwise.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The descriptions above come from the man pages.
|
||||
</p>
|
||||
|
||||
|
||||
<!-- setpeername +++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="setpeername">
|
||||
connected:<b>setpeername(</b>'*'<b>)</b><br>
|
||||
unconnected:<b>setpeername(</b>address, port<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Changes the peer of a UDP object. This
|
||||
method turns an unconnected UDP object into a connected UDP
|
||||
object or vice versa.
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
For connected objects, outgoing datagrams
|
||||
will be sent to the specified peer, and datagrams received from
|
||||
other peers will be discarded by the OS. Connected UDP objects must
|
||||
use the <a href="#send"><tt>send</tt></a> and
|
||||
<a href="#receive"><tt>receive</tt></a> methods instead of
|
||||
<a href="#sendto"><tt>sendto</tt></a> and
|
||||
<a href="#receivefrom"><tt>receivefrom</tt></a>.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Address</tt> can be an IP address or a
|
||||
host name. <tt>Port</tt> is the port number. If <tt>address</tt> is
|
||||
'<tt>*</tt>' and the object is connected, the peer association is
|
||||
removed and the object becomes an unconnected object again. In that
|
||||
case, the <tt>port</tt> argument is ignored.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
In case of error the method returns
|
||||
<b><tt>nil</tt></b> followed by an error message. In case of success, the
|
||||
method returns 1.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: Since the address of the peer does not have
|
||||
to be passed to and from the OS, the use of connected UDP objects
|
||||
is recommended when the same peer is used for several transmissions
|
||||
and can result in up to 30% performance gains.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: Starting with LuaSocket 3.0, the host name resolution
|
||||
depends on whether the socket was created by <a
|
||||
href="#socket.udp"><tt>socket.udp</tt></a> or <a
|
||||
href="#socket.udp6"><tt>socket.udp6</tt></a>. Addresses from
|
||||
the appropriate family are tried in succession until the
|
||||
first success or until the last failure.
|
||||
</p>
|
||||
|
||||
<!-- setsockname +++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="setsockname">
|
||||
unconnected:<b>setsockname(</b>address, port<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Binds the UDP object to a local address.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
<tt>Address</tt> can be an IP address or a
|
||||
host name. If <tt>address</tt> is '<tt>*</tt>' the system binds to
|
||||
all local interfaces using the constant <tt>INADDR_ANY</tt>. If
|
||||
<tt>port</tt> is 0, the system chooses an ephemeral port.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
If successful, the method returns 1. In case of
|
||||
error, the method returns <b><tt>nil</tt></b> followed by an error
|
||||
message.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: This method can only be called before any
|
||||
datagram is sent through the UDP object, and only once. Otherwise,
|
||||
the system automatically binds the object to all local interfaces
|
||||
and chooses an ephemeral port as soon as the first datagram is
|
||||
sent. After the local address is set, either automatically by the
|
||||
system or explicitly by <tt>setsockname</tt>, it cannot be
|
||||
changed.
|
||||
</p>
|
||||
|
||||
<!-- settimeout +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="settimeout">
|
||||
connected:<b>settimeout(</b>value<b>)</b><br>
|
||||
unconnected:<b>settimeout(</b>value<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Changes the timeout values for the object. By default, the
|
||||
<a href="#receive"><tt>receive</tt></a> and
|
||||
<a href="#receivefrom"><tt>receivefrom</tt></a>
|
||||
operations are blocking. That is, any call to the methods will block
|
||||
indefinitely, until data arrives. The <tt>settimeout</tt> function defines
|
||||
a limit on the amount of time the functions can block. When a timeout is
|
||||
set and the specified amount of time has elapsed, the affected methods
|
||||
give up and fail with an error code.
|
||||
</p>
|
||||
|
||||
<p class="parameters">
|
||||
The amount of time to wait is specified as
|
||||
the <tt>value</tt> parameter, in seconds. The <b><tt>nil</tt></b> timeout
|
||||
<tt>value</tt> allows operations to block indefinitely. Negative
|
||||
timeout values have the same effect.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: In UDP, the <a href="#send"><tt>send</tt></a>
|
||||
and <a href="#sentdo"><tt>sendto</tt></a> methods never block (the
|
||||
datagram is just passed to the OS and the call returns
|
||||
immediately). Therefore, the <tt>settimeout</tt> method has no
|
||||
effect on them.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The old <tt>timeout</tt> method is
|
||||
deprecated. The name has been changed for sake of uniformity, since
|
||||
all other method names already contained verbs making their
|
||||
imperative nature obvious.
|
||||
</p>
|
||||
|
||||
<!-- socket.udp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="socket.udp">
|
||||
socket.<b>udp()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns an unconnected UDP object.
|
||||
Unconnected objects support the
|
||||
<a href="#sendto"><tt>sendto</tt></a>,
|
||||
<a href="#receive"><tt>receive</tt></a>,
|
||||
<a href="#receivefrom"><tt>receivefrom</tt></a>,
|
||||
<a href="#getoption"><tt>getoption</tt></a>,
|
||||
<a href="#getsockname"><tt>getsockname</tt></a>,
|
||||
<a href="#setoption"><tt>setoption</tt></a>,
|
||||
<a href="#settimeout"><tt>settimeout</tt></a>,
|
||||
<a href="#setpeername"><tt>setpeername</tt></a>,
|
||||
<a href="#setsockname"><tt>setsockname</tt></a>, and
|
||||
<a href="#close"><tt>close</tt></a>.
|
||||
The <a href="#setpeername"><tt>setpeername</tt></a>
|
||||
is used to connect the object.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
In case of success, a new unconnected UDP object
|
||||
returned. In case of error, <b><tt>nil</tt></b> is returned, followed by
|
||||
an error message.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The choice between IPv4 and IPv6 happens during a call to
|
||||
<a href="#sendto"><tt>sendto</tt></a>, <a
|
||||
href="#setpeername"><tt>setpeername</tt></a>, or <a
|
||||
href="#setsockname"><tt>sockname</tt></a>, depending on the address
|
||||
family obtained from the resolver.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: Before the choice between IPv4 and IPv6 happens,
|
||||
the internal socket object is invalid and therefore <a
|
||||
href="#setoption"><tt>setoption</tt></a> will fail.
|
||||
</p>
|
||||
|
||||
<!-- socket.udp4 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="socket.udp4">
|
||||
socket.<b>udp4()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns an unconnected IPv4 UDP object.
|
||||
Unconnected objects support the
|
||||
<a href="#sendto"><tt>sendto</tt></a>,
|
||||
<a href="#receive"><tt>receive</tt></a>,
|
||||
<a href="#receivefrom"><tt>receivefrom</tt></a>,
|
||||
<a href="#getoption"><tt>getoption</tt></a>,
|
||||
<a href="#getsockname"><tt>getsockname</tt></a>,
|
||||
<a href="#setoption"><tt>setoption</tt></a>,
|
||||
<a href="#settimeout"><tt>settimeout</tt></a>,
|
||||
<a href="#setpeername"><tt>setpeername</tt></a>,
|
||||
<a href="#setsockname"><tt>setsockname</tt></a>, and
|
||||
<a href="#close"><tt>close</tt></a>.
|
||||
The <a href="#setpeername"><tt>setpeername</tt></a>
|
||||
is used to connect the object.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
In case of success, a new unconnected UDP object
|
||||
returned. In case of error, <b><tt>nil</tt></b> is returned, followed by
|
||||
an error message.
|
||||
</p>
|
||||
|
||||
<!-- socket.udp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class="name" id="socket.udp6">
|
||||
socket.<b>udp6()</b>
|
||||
</p>
|
||||
|
||||
<p class="description">
|
||||
Creates and returns an unconnected IPv6 UDP object.
|
||||
Unconnected objects support the
|
||||
<a href="#sendto"><tt>sendto</tt></a>,
|
||||
<a href="#receive"><tt>receive</tt></a>,
|
||||
<a href="#receivefrom"><tt>receivefrom</tt></a>,
|
||||
<a href="#getoption"><tt>getoption</tt></a>,
|
||||
<a href="#getsockname"><tt>getsockname</tt></a>,
|
||||
<a href="#setoption"><tt>setoption</tt></a>,
|
||||
<a href="#settimeout"><tt>settimeout</tt></a>,
|
||||
<a href="#setpeername"><tt>setpeername</tt></a>,
|
||||
<a href="#setsockname"><tt>setsockname</tt></a>, and
|
||||
<a href="#close"><tt>close</tt></a>.
|
||||
The <a href="#setpeername"><tt>setpeername</tt></a>
|
||||
is used to connect the object.
|
||||
</p>
|
||||
|
||||
<p class="return">
|
||||
In case of success, a new unconnected UDP object
|
||||
returned. In case of error, <b><tt>nil</tt></b> is returned, followed by
|
||||
an error message.
|
||||
</p>
|
||||
|
||||
<p class="note">
|
||||
Note: The TCP object returned will have the option
|
||||
"<tt>ipv6-v6only</tt>" set to <tt><b>true</b></tt>.
|
||||
</p>
|
||||
|
||||
|
||||
|
||||
<!-- footer ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class="footer">
|
||||
<hr>
|
||||
<center>
|
||||
<p class="bar">
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
<p>
|
||||
<small>
|
||||
Last modified by Diego Nehab on <br>
|
||||
Thu Apr 20 00:26:01 EDT 2006
|
||||
</small>
|
||||
</p>
|
||||
</center>
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,328 @@
|
|||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
||||
"http://www.w3.org/TR/html4/strict.dtd">
|
||||
<html>
|
||||
|
||||
<head>
|
||||
<meta name="description" content="LuaSocket: URL manipulation">
|
||||
<meta name="keywords" content="Lua, LuaSocket, URL, Library, Link, Network, Support">
|
||||
<title>LuaSocket: URL support</title>
|
||||
<link rel="stylesheet" href="reference.css" type="text/css">
|
||||
</head>
|
||||
|
||||
<body>
|
||||
|
||||
<!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class=header>
|
||||
<hr>
|
||||
<center>
|
||||
<table summary="LuaSocket logo">
|
||||
<tr><td align=center><a href="http://www.lua.org">
|
||||
<img width=128 height=128 border=0 alt="LuaSocket" src="luasocket.png">
|
||||
</a></td></tr>
|
||||
<tr><td align=center valign=top>Network support for the Lua language
|
||||
</td></tr>
|
||||
</table>
|
||||
<p class=bar>
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#download">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
</center>
|
||||
<hr>
|
||||
</div>
|
||||
|
||||
<!-- url ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<h2 id="url">URL</h2>
|
||||
|
||||
<p>
|
||||
The <tt>url</tt> namespace provides functions to parse, protect,
|
||||
and build URLs, as well as functions to compose absolute URLs
|
||||
from base and relative URLs, according to
|
||||
<a href="http://www.ietf.org/rfc/rfc2396.txt">RFC 2396</a>.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
To obtain the <tt>url</tt> namespace, run:
|
||||
</p>
|
||||
|
||||
<pre class=example>
|
||||
-- loads the URL module
|
||||
local url = require("socket.url")
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
An URL is defined by the following grammar:
|
||||
</p>
|
||||
|
||||
<blockquote>
|
||||
<tt>
|
||||
<url> ::= [<scheme>:][//<authority>][/<path>][;<params>][?<query>][#<fragment>]<br>
|
||||
<authority> ::= [<userinfo>@]<host>[:<port>]<br>
|
||||
<userinfo> ::= <user>[:<password>]<br>
|
||||
<path> ::= {<segment>/}<segment><br>
|
||||
</tt>
|
||||
</blockquote>
|
||||
|
||||
<!-- absolute +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class=name id="absolute">
|
||||
url.<b>absolute(</b>base, relative<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class=description>
|
||||
Builds an absolute URL from a base URL and a relative URL.
|
||||
</p>
|
||||
|
||||
<p class=parameters>
|
||||
<tt>Base</tt> is a string with the base URL or
|
||||
a parsed URL table. <tt>Relative</tt> is a
|
||||
string with the relative URL.
|
||||
</p>
|
||||
|
||||
<p class=return>
|
||||
The function returns a string with the absolute URL.
|
||||
</p>
|
||||
|
||||
<p class=note>
|
||||
Note: The rules that
|
||||
govern the composition are fairly complex, and are described in detail in
|
||||
<a href="http://www.ietf.org/rfc/rfc2396.txt">RFC 2396</a>.
|
||||
The example bellow should give an idea of what the rules are.
|
||||
</p>
|
||||
|
||||
<pre class=example>
|
||||
http://a/b/c/d;p?q
|
||||
|
||||
+
|
||||
|
||||
g:h = g:h
|
||||
g = http://a/b/c/g
|
||||
./g = http://a/b/c/g
|
||||
g/ = http://a/b/c/g/
|
||||
/g = http://a/g
|
||||
//g = http://g
|
||||
?y = http://a/b/c/?y
|
||||
g?y = http://a/b/c/g?y
|
||||
#s = http://a/b/c/d;p?q#s
|
||||
g#s = http://a/b/c/g#s
|
||||
g?y#s = http://a/b/c/g?y#s
|
||||
;x = http://a/b/c/;x
|
||||
g;x = http://a/b/c/g;x
|
||||
g;x?y#s = http://a/b/c/g;x?y#s
|
||||
. = http://a/b/c/
|
||||
./ = http://a/b/c/
|
||||
.. = http://a/b/
|
||||
../ = http://a/b/
|
||||
../g = http://a/b/g
|
||||
../.. = http://a/
|
||||
../../ = http://a/
|
||||
../../g = http://a/g
|
||||
</pre>
|
||||
|
||||
<!-- build ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class=name id="build">
|
||||
url.<b>build(</b>parsed_url<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class=description>
|
||||
Rebuilds an URL from its parts.
|
||||
</p>
|
||||
|
||||
<p class=parameters>
|
||||
<tt>Parsed_url</tt> is a table with same components returned by
|
||||
<a href="#parse"><tt>parse</tt></a>.
|
||||
Lower level components, if specified,
|
||||
take precedence over high level components of the URL grammar.
|
||||
</p>
|
||||
|
||||
<p class=return>
|
||||
The function returns a string with the built URL.
|
||||
</p>
|
||||
|
||||
<!-- build_path +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class=name id="build_path">
|
||||
url.<b>build_path(</b>segments, unsafe<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class=description>
|
||||
Builds a <tt><path></tt> component from a list of
|
||||
<tt><segment></tt> parts.
|
||||
Before composition, any reserved characters found in a segment are escaped into
|
||||
their protected form, so that the resulting path is a valid URL path
|
||||
component.
|
||||
</p>
|
||||
|
||||
<p class=parameters>
|
||||
<tt>Segments</tt> is a list of strings with the <tt><segment></tt>
|
||||
parts. If <tt>unsafe</tt> is anything but <b><tt>nil</tt></b>, reserved
|
||||
characters are left untouched.
|
||||
</p>
|
||||
|
||||
<p class=return>
|
||||
The function returns a string with the
|
||||
built <tt><path></tt> component.
|
||||
</p>
|
||||
|
||||
<!-- escape +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class=name id="escape">
|
||||
url.<b>escape(</b>content<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class=description>
|
||||
Applies the URL escaping content coding to a string
|
||||
Each byte is encoded as a percent character followed
|
||||
by the two byte hexadecimal representation of its integer
|
||||
value.
|
||||
</p>
|
||||
|
||||
<p class=parameters>
|
||||
<tt>Content</tt> is the string to be encoded.
|
||||
</p>
|
||||
|
||||
<p class=result>
|
||||
The function returns the encoded string.
|
||||
</p>
|
||||
|
||||
<pre class=example>
|
||||
-- load url module
|
||||
url = require("socket.url")
|
||||
|
||||
code = url.escape("/#?;")
|
||||
-- code = "%2f%23%3f%3b"
|
||||
</pre>
|
||||
|
||||
<!-- parse ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class=name id="parse">
|
||||
url.<b>parse(</b>url, default<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class=description>
|
||||
Parses an URL given as a string into a Lua table with its components.
|
||||
</p>
|
||||
|
||||
<p class=parameters>
|
||||
<tt>Url</tt> is the URL to be parsed. If the <tt>default</tt> table is
|
||||
present, it is used to store the parsed fields. Only fields present in the
|
||||
URL are overwritten. Therefore, this table can be used to pass default
|
||||
values for each field.
|
||||
</p>
|
||||
|
||||
<p class=return>
|
||||
The function returns a table with all the URL components:
|
||||
</p>
|
||||
|
||||
<blockquote><tt>
|
||||
parsed_url = {<br>
|
||||
url = <i>string</i>,<br>
|
||||
scheme = <i>string</i>,<br>
|
||||
authority = <i>string</i>,<br>
|
||||
path = <i>string</i>,<br>
|
||||
params = <i>string</i>,<br>
|
||||
query = <i>string</i>,<br>
|
||||
fragment = <i>string</i>,<br>
|
||||
userinfo = <i>string</i>,<br>
|
||||
host = <i>string</i>,<br>
|
||||
port = <i>string</i>,<br>
|
||||
user = <i>string</i>,<br>
|
||||
password = <i>string</i><br>
|
||||
}
|
||||
</tt></blockquote>
|
||||
|
||||
<pre class=example>
|
||||
-- load url module
|
||||
url = require("socket.url")
|
||||
|
||||
parsed_url = url.parse("http://www.example.com/cgilua/index.lua?a=2#there")
|
||||
-- parsed_url = {
|
||||
-- scheme = "http",
|
||||
-- authority = "www.example.com",
|
||||
-- path = "/cgilua/index.lua"
|
||||
-- query = "a=2",
|
||||
-- fragment = "there",
|
||||
-- host = "www.puc-rio.br",
|
||||
-- }
|
||||
|
||||
parsed_url = url.parse("ftp://root:passwd@unsafe.org/pub/virus.exe;type=i")
|
||||
-- parsed_url = {
|
||||
-- scheme = "ftp",
|
||||
-- authority = "root:passwd@unsafe.org",
|
||||
-- path = "/pub/virus.exe",
|
||||
-- params = "type=i",
|
||||
-- userinfo = "root:passwd",
|
||||
-- host = "unsafe.org",
|
||||
-- user = "root",
|
||||
-- password = "passwd",
|
||||
-- }
|
||||
</pre>
|
||||
|
||||
<!-- parse_path +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class=name id="parse_path">
|
||||
url.<b>parse_path(</b>path<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class=description>
|
||||
Breaks a <tt><path></tt> URL component into all its
|
||||
<tt><segment></tt> parts.
|
||||
</p>
|
||||
|
||||
<p class=description>
|
||||
<tt>Path</tt> is a string with the path to be parsed.
|
||||
</p>
|
||||
|
||||
<p class=return>
|
||||
Since some characters are reserved in URLs, they must be escaped
|
||||
whenever present in a <tt><path></tt> component. Therefore, before
|
||||
returning a list with all the parsed segments, the function removes
|
||||
escaping from all of them.
|
||||
</p>
|
||||
|
||||
<!-- unescape +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<p class=name id="unescape">
|
||||
url.<b>unescape(</b>content<b>)</b>
|
||||
</p>
|
||||
|
||||
<p class=description>
|
||||
Removes the URL escaping content coding from a string.
|
||||
</p>
|
||||
|
||||
<p class=parameters>
|
||||
<tt>Content</tt> is the string to be decoded.
|
||||
</p>
|
||||
|
||||
<p class=return>
|
||||
The function returns the decoded string.
|
||||
</p>
|
||||
|
||||
<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
||||
|
||||
<div class=footer>
|
||||
<hr>
|
||||
<center>
|
||||
<p class=bar>
|
||||
<a href="index.html">home</a> ·
|
||||
<a href="index.html#down">download</a> ·
|
||||
<a href="installation.html">installation</a> ·
|
||||
<a href="introduction.html">introduction</a> ·
|
||||
<a href="reference.html">reference</a>
|
||||
</p>
|
||||
<p>
|
||||
<small>
|
||||
Last modified by Diego Nehab on <br>
|
||||
Thu Apr 20 00:26:05 EDT 2006
|
||||
</small>
|
||||
</p>
|
||||
</center>
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,89 @@
|
|||
This directory contains code that is more useful than the
|
||||
samples. This code *is* supported.
|
||||
|
||||
tftp.lua -- Trivial FTP client
|
||||
|
||||
This module implements file retrieval by the TFTP protocol.
|
||||
Its main use was to test the UDP code, but since someone
|
||||
found it usefull, I turned it into a module that is almost
|
||||
official (no uploads, yet).
|
||||
|
||||
dict.lua -- Dict client
|
||||
|
||||
The dict.lua module started with a cool simple client
|
||||
for the DICT protocol, written by Luiz Henrique Figueiredo.
|
||||
This new version has been converted into a library, similar
|
||||
to the HTTP and FTP libraries, that can be used from within
|
||||
any luasocket application. Take a look on the source code
|
||||
and you will be able to figure out how to use it.
|
||||
|
||||
lp.lua -- LPD client library
|
||||
|
||||
The lp.lua module implements the client part of the Line
|
||||
Printer Daemon protocol, used to print files on Unix
|
||||
machines. It is courtesy of David Burgess! See the source
|
||||
code and the lpr.lua in the examples directory.
|
||||
|
||||
b64.lua
|
||||
qp.lua
|
||||
eol.lua
|
||||
|
||||
These are tiny programs that perform Base64,
|
||||
Quoted-Printable and end-of-line marker conversions.
|
||||
|
||||
get.lua -- file retriever
|
||||
|
||||
This little program is a client that uses the FTP and
|
||||
HTTP code to implement a command line file graber. Just
|
||||
run
|
||||
|
||||
lua get.lua <remote-file> [<local-file>]
|
||||
|
||||
to download a remote file (either ftp:// or http://) to
|
||||
the specified local file. The program also prints the
|
||||
download throughput, elapsed time, bytes already downloaded
|
||||
etc during download.
|
||||
|
||||
check-memory.lua -- checks memory consumption
|
||||
|
||||
This is just to see how much memory each module uses.
|
||||
|
||||
dispatch.lua -- coroutine based dispatcher
|
||||
|
||||
This is a first try at a coroutine based non-blocking
|
||||
dispatcher for LuaSocket. Take a look at 'check-links.lua'
|
||||
and at 'forward.lua' to see how to use it.
|
||||
|
||||
check-links.lua -- HTML link checker program
|
||||
|
||||
This little program scans a HTML file and checks for broken
|
||||
links. It is similar to check-links.pl by Jamie Zawinski,
|
||||
but uses all facilities of the LuaSocket library and the Lua
|
||||
language. It has not been thoroughly tested, but it should
|
||||
work. Just run
|
||||
|
||||
lua check-links.lua [-n] {<url>} > output
|
||||
|
||||
and open the result to see a list of broken links. Make sure
|
||||
you check the '-n' switch. It runs in non-blocking mode,
|
||||
using coroutines, and is MUCH faster!
|
||||
|
||||
forward.lua -- coroutine based forward server
|
||||
|
||||
This is a forward server that can accept several connections
|
||||
and transfers simultaneously using non-blocking I/O and the
|
||||
coroutine-based dispatcher. You can run, for example
|
||||
|
||||
lua forward.lua 8080:proxy.com:3128
|
||||
|
||||
to redirect all local conections to port 8080 to the host
|
||||
'proxy.com' at port 3128.
|
||||
|
||||
unix.c and unix.h
|
||||
|
||||
This is an implementation of Unix local domain sockets and
|
||||
demonstrates how to extend LuaSocket with a new type of
|
||||
transport. It has been tested on Linux and on Mac OS X.
|
||||
|
||||
Good luck,
|
||||
Diego.
|
||||
|
|
@ -0,0 +1,19 @@
|
|||
-----------------------------------------------------------------------------
|
||||
-- Little program to convert to and from Base64
|
||||
-- LuaSocket sample files
|
||||
-- Author: Diego Nehab
|
||||
-----------------------------------------------------------------------------
|
||||
local ltn12 = require("ltn12")
|
||||
local mime = require("mime")
|
||||
local source = ltn12.source.file(io.stdin)
|
||||
local sink = ltn12.sink.file(io.stdout)
|
||||
local convert
|
||||
if arg and arg[1] == '-d' then
|
||||
convert = mime.decode("base64")
|
||||
else
|
||||
local base64 = mime.encode("base64")
|
||||
local wrap = mime.wrap()
|
||||
convert = ltn12.filter.chain(base64, wrap)
|
||||
end
|
||||
sink = ltn12.sink.chain(convert, sink)
|
||||
ltn12.pump.all(source, sink)
|
||||
|
|
@ -0,0 +1,111 @@
|
|||
-----------------------------------------------------------------------------
|
||||
-- Little program that checks links in HTML files, using coroutines and
|
||||
-- non-blocking I/O via the dispatcher module.
|
||||
-- LuaSocket sample files
|
||||
-- Author: Diego Nehab
|
||||
-----------------------------------------------------------------------------
|
||||
local url = require("socket.url")
|
||||
local dispatch = require("dispatch")
|
||||
local http = require("socket.http")
|
||||
dispatch.TIMEOUT = 10
|
||||
|
||||
-- make sure the user knows how to invoke us
|
||||
arg = arg or {}
|
||||
if #arg < 1 then
|
||||
print("Usage:\n luasocket check-links.lua [-n] {<url>}")
|
||||
exit()
|
||||
end
|
||||
|
||||
-- '-n' means we are running in non-blocking mode
|
||||
if arg[1] == "-n" then
|
||||
-- if non-blocking I/O was requested, use real dispatcher interface
|
||||
table.remove(arg, 1)
|
||||
handler = dispatch.newhandler("coroutine")
|
||||
else
|
||||
-- if using blocking I/O, use fake dispatcher interface
|
||||
handler = dispatch.newhandler("sequential")
|
||||
end
|
||||
|
||||
local nthreads = 0
|
||||
|
||||
-- get the status of a URL using the dispatcher
|
||||
function getstatus(link)
|
||||
local parsed = url.parse(link, {scheme = "file"})
|
||||
if parsed.scheme == "http" then
|
||||
nthreads = nthreads + 1
|
||||
handler:start(function()
|
||||
local r, c, h, s = http.request{
|
||||
method = "HEAD",
|
||||
url = link,
|
||||
create = handler.tcp
|
||||
}
|
||||
if r and c == 200 then io.write('\t', link, '\n')
|
||||
else io.write('\t', link, ': ', tostring(c), '\n') end
|
||||
nthreads = nthreads - 1
|
||||
end)
|
||||
end
|
||||
end
|
||||
|
||||
function readfile(path)
|
||||
path = url.unescape(path)
|
||||
local file, error = io.open(path, "r")
|
||||
if file then
|
||||
local body = file:read("*a")
|
||||
file:close()
|
||||
return body
|
||||
else return nil, error end
|
||||
end
|
||||
|
||||
function load(u)
|
||||
local parsed = url.parse(u, { scheme = "file" })
|
||||
local body, headers, code, error
|
||||
local base = u
|
||||
if parsed.scheme == "http" then
|
||||
body, code, headers = http.request(u)
|
||||
if code == 200 then
|
||||
-- if there was a redirect, update base to reflect it
|
||||
base = headers.location or base
|
||||
end
|
||||
if not body then
|
||||
error = code
|
||||
end
|
||||
elseif parsed.scheme == "file" then
|
||||
body, error = readfile(parsed.path)
|
||||
else error = string.format("unhandled scheme '%s'", parsed.scheme) end
|
||||
return base, body, error
|
||||
end
|
||||
|
||||
function getlinks(body, base)
|
||||
-- get rid of comments
|
||||
body = string.gsub(body, "%<%!%-%-.-%-%-%>", "")
|
||||
local links = {}
|
||||
-- extract links
|
||||
body = string.gsub(body, '[Hh][Rr][Ee][Ff]%s*=%s*"([^"]*)"', function(href)
|
||||
table.insert(links, url.absolute(base, href))
|
||||
end)
|
||||
body = string.gsub(body, "[Hh][Rr][Ee][Ff]%s*=%s*'([^']*)'", function(href)
|
||||
table.insert(links, url.absolute(base, href))
|
||||
end)
|
||||
string.gsub(body, "[Hh][Rr][Ee][Ff]%s*=%s*(.-)>", function(href)
|
||||
table.insert(links, url.absolute(base, href))
|
||||
end)
|
||||
return links
|
||||
end
|
||||
|
||||
function checklinks(address)
|
||||
local base, body, error = load(address)
|
||||
if not body then print(error) return end
|
||||
print("Checking ", base)
|
||||
local links = getlinks(body, base)
|
||||
for _, link in ipairs(links) do
|
||||
getstatus(link)
|
||||
end
|
||||
end
|
||||
|
||||
for _, address in ipairs(arg) do
|
||||
checklinks(url.absolute("file:", address))
|
||||
end
|
||||
|
||||
while nthreads > 0 do
|
||||
handler:step()
|
||||
end
|
||||
|
|
@ -0,0 +1,17 @@
|
|||
function load(s)
|
||||
collectgarbage()
|
||||
local a = gcinfo()
|
||||
_G[s] = require(s)
|
||||
collectgarbage()
|
||||
local b = gcinfo()
|
||||
print(s .. ":\t " .. (b-a) .. "k")
|
||||
end
|
||||
|
||||
load("socket.url")
|
||||
load("ltn12")
|
||||
load("socket")
|
||||
load("mime")
|
||||
load("socket.tp")
|
||||
load("socket.smtp")
|
||||
load("socket.http")
|
||||
load("socket.ftp")
|
||||
|
|
@ -0,0 +1,88 @@
|
|||
local socket = require"socket"
|
||||
local http = require"socket.http"
|
||||
local url = require"socket.url"
|
||||
local ltn12 = require"ltn12"
|
||||
|
||||
local token_class = '[^%c%s%(%)%<%>%@%,%;%:%\\%"%/%[%]%?%=%{%}]'
|
||||
|
||||
local function unquote(t, quoted)
|
||||
local n = string.match(t, "%$(%d+)$")
|
||||
if n then n = tonumber(n) end
|
||||
if quoted[n] then return quoted[n]
|
||||
else return t end
|
||||
end
|
||||
|
||||
local function parse_set_cookie(c, quoted, cookie_table)
|
||||
c = c .. ";$last=last;"
|
||||
local _, _, n, v, i = string.find(c, "(" .. token_class ..
|
||||
"+)%s*=%s*(.-)%s*;%s*()")
|
||||
local cookie = {
|
||||
name = n,
|
||||
value = unquote(v, quoted),
|
||||
attributes = {}
|
||||
}
|
||||
while 1 do
|
||||
_, _, n, v, i = string.find(c, "(" .. token_class ..
|
||||
"+)%s*=?%s*(.-)%s*;%s*()", i)
|
||||
if not n or n == "$last" then break end
|
||||
cookie.attributes[#cookie.attributes+1] = {
|
||||
name = n,
|
||||
value = unquote(v, quoted)
|
||||
}
|
||||
end
|
||||
cookie_table[#cookie_table+1] = cookie
|
||||
end
|
||||
|
||||
local function split_set_cookie(s, cookie_table)
|
||||
cookie_table = cookie_table or {}
|
||||
-- remove quoted strings from cookie list
|
||||
local quoted = {}
|
||||
s = string.gsub(s, '"(.-)"', function(q)
|
||||
quoted[#quoted+1] = q
|
||||
return "$" .. #quoted
|
||||
end)
|
||||
-- add sentinel
|
||||
s = s .. ",$last="
|
||||
-- split into individual cookies
|
||||
i = 1
|
||||
while 1 do
|
||||
local _, _, cookie, next_token
|
||||
_, _, cookie, i, next_token = string.find(s, "(.-)%s*%,%s*()(" ..
|
||||
token_class .. "+)%s*=", i)
|
||||
if not next_token then break end
|
||||
parse_set_cookie(cookie, quoted, cookie_table)
|
||||
if next_token == "$last" then break end
|
||||
end
|
||||
return cookie_table
|
||||
end
|
||||
|
||||
local function quote(s)
|
||||
if string.find(s, "[ %,%;]") then return '"' .. s .. '"'
|
||||
else return s end
|
||||
end
|
||||
|
||||
local _empty = {}
|
||||
local function build_cookies(cookies)
|
||||
s = ""
|
||||
for i,v in ipairs(cookies or _empty) do
|
||||
if v.name then
|
||||
s = s .. v.name
|
||||
if v.value and v.value ~= "" then
|
||||
s = s .. '=' .. quote(v.value)
|
||||
end
|
||||
end
|
||||
if v.name and #(v.attributes or _empty) > 0 then s = s .. "; " end
|
||||
for j,u in ipairs(v.attributes or _empty) do
|
||||
if u.name then
|
||||
s = s .. u.name
|
||||
if u.value and u.value ~= "" then
|
||||
s = s .. '=' .. quote(u.value)
|
||||
end
|
||||
end
|
||||
if j < #v.attributes then s = s .. "; " end
|
||||
end
|
||||
if i < #cookies then s = s .. ", " end
|
||||
end
|
||||
return s
|
||||
end
|
||||
|
||||
|
|
@ -0,0 +1,151 @@
|
|||
-----------------------------------------------------------------------------
|
||||
-- Little program to download DICT word definitions
|
||||
-- LuaSocket sample files
|
||||
-- Author: Diego Nehab
|
||||
-----------------------------------------------------------------------------
|
||||
|
||||
-----------------------------------------------------------------------------
|
||||
-- Load required modules
|
||||
-----------------------------------------------------------------------------
|
||||
local base = _G
|
||||
local string = require("string")
|
||||
local table = require("table")
|
||||
local socket = require("socket")
|
||||
local url = require("socket.url")
|
||||
local tp = require("socket.tp")
|
||||
module("socket.dict")
|
||||
|
||||
-----------------------------------------------------------------------------
|
||||
-- Globals
|
||||
-----------------------------------------------------------------------------
|
||||
HOST = "dict.org"
|
||||
PORT = 2628
|
||||
TIMEOUT = 10
|
||||
|
||||
-----------------------------------------------------------------------------
|
||||
-- Low-level dict API
|
||||
-----------------------------------------------------------------------------
|
||||
local metat = { __index = {} }
|
||||
|
||||
function open(host, port)
|
||||
local tp = socket.try(tp.connect(host or HOST, port or PORT, TIMEOUT))
|
||||
return base.setmetatable({tp = tp}, metat)
|
||||
end
|
||||
|
||||
function metat.__index:greet()
|
||||
return socket.try(self.tp:check(220))
|
||||
end
|
||||
|
||||
function metat.__index:check(ok)
|
||||
local code, status = socket.try(self.tp:check(ok))
|
||||
return code,
|
||||
base.tonumber(socket.skip(2, string.find(status, "^%d%d%d (%d*)")))
|
||||
end
|
||||
|
||||
function metat.__index:getdef()
|
||||
local line = socket.try(self.tp:receive())
|
||||
local def = {}
|
||||
while line ~= "." do
|
||||
table.insert(def, line)
|
||||
line = socket.try(self.tp:receive())
|
||||
end
|
||||
return table.concat(def, "\n")
|
||||
end
|
||||
|
||||
function metat.__index:define(database, word)
|
||||
database = database or "!"
|
||||
socket.try(self.tp:command("DEFINE", database .. " " .. word))
|
||||
local code, count = self:check(150)
|
||||
local defs = {}
|
||||
for i = 1, count do
|
||||
self:check(151)
|
||||
table.insert(defs, self:getdef())
|
||||
end
|
||||
self:check(250)
|
||||
return defs
|
||||
end
|
||||
|
||||
function metat.__index:match(database, strat, word)
|
||||
database = database or "!"
|
||||
strat = strat or "."
|
||||
socket.try(self.tp:command("MATCH", database .." ".. strat .." ".. word))
|
||||
self:check(152)
|
||||
local mat = {}
|
||||
local line = socket.try(self.tp:receive())
|
||||
while line ~= '.' do
|
||||
database, word = socket.skip(2, string.find(line, "(%S+) (.*)"))
|
||||
if not mat[database] then mat[database] = {} end
|
||||
table.insert(mat[database], word)
|
||||
line = socket.try(self.tp:receive())
|
||||
end
|
||||
self:check(250)
|
||||
return mat
|
||||
end
|
||||
|
||||
function metat.__index:quit()
|
||||
self.tp:command("QUIT")
|
||||
return self:check(221)
|
||||
end
|
||||
|
||||
function metat.__index:close()
|
||||
return self.tp:close()
|
||||
end
|
||||
|
||||
-----------------------------------------------------------------------------
|
||||
-- High-level dict API
|
||||
-----------------------------------------------------------------------------
|
||||
local default = {
|
||||
scheme = "dict",
|
||||
host = "dict.org"
|
||||
}
|
||||
|
||||
local function there(f)
|
||||
if f == "" then return nil
|
||||
else return f end
|
||||
end
|
||||
|
||||
local function parse(u)
|
||||
local t = socket.try(url.parse(u, default))
|
||||
socket.try(t.scheme == "dict", "invalid scheme '" .. t.scheme .. "'")
|
||||
socket.try(t.path, "invalid path in url")
|
||||
local cmd, arg = socket.skip(2, string.find(t.path, "^/(.)(.*)$"))
|
||||
socket.try(cmd == "d" or cmd == "m", "<command> should be 'm' or 'd'")
|
||||
socket.try(arg and arg ~= "", "need at least <word> in URL")
|
||||
t.command, t.argument = cmd, arg
|
||||
arg = string.gsub(arg, "^:([^:]+)", function(f) t.word = f end)
|
||||
socket.try(t.word, "need at least <word> in URL")
|
||||
arg = string.gsub(arg, "^:([^:]*)", function(f) t.database = there(f) end)
|
||||
if cmd == "m" then
|
||||
arg = string.gsub(arg, "^:([^:]*)", function(f) t.strat = there(f) end)
|
||||
end
|
||||
string.gsub(arg, ":([^:]*)$", function(f) t.n = base.tonumber(f) end)
|
||||
return t
|
||||
end
|
||||
|
||||
local function tget(gett)
|
||||
local con = open(gett.host, gett.port)
|
||||
con:greet()
|
||||
if gett.command == "d" then
|
||||
local def = con:define(gett.database, gett.word)
|
||||
con:quit()
|
||||
con:close()
|
||||
if gett.n then return def[gett.n]
|
||||
else return def end
|
||||
elseif gett.command == "m" then
|
||||
local mat = con:match(gett.database, gett.strat, gett.word)
|
||||
con:quit()
|
||||
con:close()
|
||||
return mat
|
||||
else return nil, "invalid command" end
|
||||
end
|
||||
|
||||
local function sget(u)
|
||||
local gett = parse(u)
|
||||
return tget(gett)
|
||||
end
|
||||
|
||||
get = socket.protect(function(gett)
|
||||
if base.type(gett) == "string" then return sget(gett)
|
||||
else return tget(gett) end
|
||||
end)
|
||||
|
||||
|
|
@ -0,0 +1,307 @@
|
|||
-----------------------------------------------------------------------------
|
||||
-- A hacked dispatcher module
|
||||
-- LuaSocket sample files
|
||||
-- Author: Diego Nehab
|
||||
-----------------------------------------------------------------------------
|
||||
local base = _G
|
||||
local table = require("table")
|
||||
local string = require("string")
|
||||
local socket = require("socket")
|
||||
local coroutine = require("coroutine")
|
||||
module("dispatch")
|
||||
|
||||
-- if too much time goes by without any activity in one of our sockets, we
|
||||
-- just kill it
|
||||
TIMEOUT = 60
|
||||
|
||||
-----------------------------------------------------------------------------
|
||||
-- We implement 3 types of dispatchers:
|
||||
-- sequential
|
||||
-- coroutine
|
||||
-- threaded
|
||||
-- The user can choose whatever one is needed
|
||||
-----------------------------------------------------------------------------
|
||||
local handlert = {}
|
||||
|
||||
-- default handler is coroutine
|
||||
function newhandler(mode)
|
||||
mode = mode or "coroutine"
|
||||
return handlert[mode]()
|
||||
end
|
||||
|
||||
local function seqstart(self, func)
|
||||
return func()
|
||||
end
|
||||
|
||||
-- sequential handler simply calls the functions and doesn't wrap I/O
|
||||
function handlert.sequential()
|
||||
return {
|
||||
tcp = socket.tcp,
|
||||
start = seqstart
|
||||
}
|
||||
end
|
||||
|
||||
-----------------------------------------------------------------------------
|
||||
-- Mega hack. Don't try to do this at home.
|
||||
-----------------------------------------------------------------------------
|
||||
-- we can't yield across calls to protect on Lua 5.1, so we rewrite it with
|
||||
-- coroutines
|
||||
-- make sure you don't require any module that uses socket.protect before
|
||||
-- loading our hack
|
||||
if string.sub(base._VERSION, -3) == "5.1" then
|
||||
local function _protect(co, status, ...)
|
||||
if not status then
|
||||
local msg = ...
|
||||
if base.type(msg) == 'table' then
|
||||
return nil, msg[1]
|
||||
else
|
||||
base.error(msg, 0)
|
||||
end
|
||||
end
|
||||
if coroutine.status(co) == "suspended" then
|
||||
return _protect(co, coroutine.resume(co, coroutine.yield(...)))
|
||||
else
|
||||
return ...
|
||||
end
|
||||
end
|
||||
|
||||
function socket.protect(f)
|
||||
return function(...)
|
||||
local co = coroutine.create(f)
|
||||
return _protect(co, coroutine.resume(co, ...))
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
-----------------------------------------------------------------------------
|
||||
-- Simple set data structure. O(1) everything.
|
||||
-----------------------------------------------------------------------------
|
||||
local function newset()
|
||||
local reverse = {}
|
||||
local set = {}
|
||||
return base.setmetatable(set, {__index = {
|
||||
insert = function(set, value)
|
||||
if not reverse[value] then
|
||||
table.insert(set, value)
|
||||
reverse[value] = #set
|
||||
end
|
||||
end,
|
||||
remove = function(set, value)
|
||||
local index = reverse[value]
|
||||
if index then
|
||||
reverse[value] = nil
|
||||
local top = table.remove(set)
|
||||
if top ~= value then
|
||||
reverse[top] = index
|
||||
set[index] = top
|
||||
end
|
||||
end
|
||||
end
|
||||
}})
|
||||
end
|
||||
|
||||
-----------------------------------------------------------------------------
|
||||
-- socket.tcp() wrapper for the coroutine dispatcher
|
||||
-----------------------------------------------------------------------------
|
||||
local function cowrap(dispatcher, tcp, error)
|
||||
if not tcp then return nil, error end
|
||||
-- put it in non-blocking mode right away
|
||||
tcp:settimeout(0)
|
||||
-- metatable for wrap produces new methods on demand for those that we
|
||||
-- don't override explicitly.
|
||||
local metat = { __index = function(table, key)
|
||||
table[key] = function(...)
|
||||
return tcp[key](tcp,select(2,...))
|
||||
end
|
||||
return table[key]
|
||||
end}
|
||||
-- does our user want to do his own non-blocking I/O?
|
||||
local zero = false
|
||||
-- create a wrap object that will behave just like a real socket object
|
||||
local wrap = { }
|
||||
-- we ignore settimeout to preserve our 0 timeout, but record whether
|
||||
-- the user wants to do his own non-blocking I/O
|
||||
function wrap:settimeout(value, mode)
|
||||
if value == 0 then zero = true
|
||||
else zero = false end
|
||||
return 1
|
||||
end
|
||||
-- send in non-blocking mode and yield on timeout
|
||||
function wrap:send(data, first, last)
|
||||
first = (first or 1) - 1
|
||||
local result, error
|
||||
while true do
|
||||
-- return control to dispatcher and tell it we want to send
|
||||
-- if upon return the dispatcher tells us we timed out,
|
||||
-- return an error to whoever called us
|
||||
if coroutine.yield(dispatcher.sending, tcp) == "timeout" then
|
||||
return nil, "timeout"
|
||||
end
|
||||
-- try sending
|
||||
result, error, first = tcp:send(data, first+1, last)
|
||||
-- if we are done, or there was an unexpected error,
|
||||
-- break away from loop
|
||||
if error ~= "timeout" then return result, error, first end
|
||||
end
|
||||
end
|
||||
-- receive in non-blocking mode and yield on timeout
|
||||
-- or simply return partial read, if user requested timeout = 0
|
||||
function wrap:receive(pattern, partial)
|
||||
local error = "timeout"
|
||||
local value
|
||||
while true do
|
||||
-- return control to dispatcher and tell it we want to receive
|
||||
-- if upon return the dispatcher tells us we timed out,
|
||||
-- return an error to whoever called us
|
||||
if coroutine.yield(dispatcher.receiving, tcp) == "timeout" then
|
||||
return nil, "timeout"
|
||||
end
|
||||
-- try receiving
|
||||
value, error, partial = tcp:receive(pattern, partial)
|
||||
-- if we are done, or there was an unexpected error,
|
||||
-- break away from loop. also, if the user requested
|
||||
-- zero timeout, return all we got
|
||||
if (error ~= "timeout") or zero then
|
||||
return value, error, partial
|
||||
end
|
||||
end
|
||||
end
|
||||
-- connect in non-blocking mode and yield on timeout
|
||||
function wrap:connect(host, port)
|
||||
local result, error = tcp:connect(host, port)
|
||||
if error == "timeout" then
|
||||
-- return control to dispatcher. we will be writable when
|
||||
-- connection succeeds.
|
||||
-- if upon return the dispatcher tells us we have a
|
||||
-- timeout, just abort
|
||||
if coroutine.yield(dispatcher.sending, tcp) == "timeout" then
|
||||
return nil, "timeout"
|
||||
end
|
||||
-- when we come back, check if connection was successful
|
||||
result, error = tcp:connect(host, port)
|
||||
if result or error == "already connected" then return 1
|
||||
else return nil, "non-blocking connect failed" end
|
||||
else return result, error end
|
||||
end
|
||||
-- accept in non-blocking mode and yield on timeout
|
||||
function wrap:accept()
|
||||
while 1 do
|
||||
-- return control to dispatcher. we will be readable when a
|
||||
-- connection arrives.
|
||||
-- if upon return the dispatcher tells us we have a
|
||||
-- timeout, just abort
|
||||
if coroutine.yield(dispatcher.receiving, tcp) == "timeout" then
|
||||
return nil, "timeout"
|
||||
end
|
||||
local client, error = tcp:accept()
|
||||
if error ~= "timeout" then
|
||||
return cowrap(dispatcher, client, error)
|
||||
end
|
||||
end
|
||||
end
|
||||
-- remove cortn from context
|
||||
function wrap:close()
|
||||
dispatcher.stamp[tcp] = nil
|
||||
dispatcher.sending.set:remove(tcp)
|
||||
dispatcher.sending.cortn[tcp] = nil
|
||||
dispatcher.receiving.set:remove(tcp)
|
||||
dispatcher.receiving.cortn[tcp] = nil
|
||||
return tcp:close()
|
||||
end
|
||||
return base.setmetatable(wrap, metat)
|
||||
end
|
||||
|
||||
|
||||
-----------------------------------------------------------------------------
|
||||
-- Our coroutine dispatcher
|
||||
-----------------------------------------------------------------------------
|
||||
local cometat = { __index = {} }
|
||||
|
||||
function schedule(cortn, status, operation, tcp)
|
||||
if status then
|
||||
if cortn and operation then
|
||||
operation.set:insert(tcp)
|
||||
operation.cortn[tcp] = cortn
|
||||
operation.stamp[tcp] = socket.gettime()
|
||||
end
|
||||
else base.error(operation) end
|
||||
end
|
||||
|
||||
function kick(operation, tcp)
|
||||
operation.cortn[tcp] = nil
|
||||
operation.set:remove(tcp)
|
||||
end
|
||||
|
||||
function wakeup(operation, tcp)
|
||||
local cortn = operation.cortn[tcp]
|
||||
-- if cortn is still valid, wake it up
|
||||
if cortn then
|
||||
kick(operation, tcp)
|
||||
return cortn, coroutine.resume(cortn)
|
||||
-- othrewise, just get scheduler not to do anything
|
||||
else
|
||||
return nil, true
|
||||
end
|
||||
end
|
||||
|
||||
function abort(operation, tcp)
|
||||
local cortn = operation.cortn[tcp]
|
||||
if cortn then
|
||||
kick(operation, tcp)
|
||||
coroutine.resume(cortn, "timeout")
|
||||
end
|
||||
end
|
||||
|
||||
-- step through all active cortns
|
||||
function cometat.__index:step()
|
||||
-- check which sockets are interesting and act on them
|
||||
local readable, writable = socket.select(self.receiving.set,
|
||||
self.sending.set, 1)
|
||||
-- for all readable connections, resume their cortns and reschedule
|
||||
-- when they yield back to us
|
||||
for _, tcp in base.ipairs(readable) do
|
||||
schedule(wakeup(self.receiving, tcp))
|
||||
end
|
||||
-- for all writable connections, do the same
|
||||
for _, tcp in base.ipairs(writable) do
|
||||
schedule(wakeup(self.sending, tcp))
|
||||
end
|
||||
-- politely ask replacement I/O functions in idle cortns to
|
||||
-- return reporting a timeout
|
||||
local now = socket.gettime()
|
||||
for tcp, stamp in base.pairs(self.stamp) do
|
||||
if tcp.class == "tcp{client}" and now - stamp > TIMEOUT then
|
||||
abort(self.sending, tcp)
|
||||
abort(self.receiving, tcp)
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
function cometat.__index:start(func)
|
||||
local cortn = coroutine.create(func)
|
||||
schedule(cortn, coroutine.resume(cortn))
|
||||
end
|
||||
|
||||
function handlert.coroutine()
|
||||
local stamp = {}
|
||||
local dispatcher = {
|
||||
stamp = stamp,
|
||||
sending = {
|
||||
name = "sending",
|
||||
set = newset(),
|
||||
cortn = {},
|
||||
stamp = stamp
|
||||
},
|
||||
receiving = {
|
||||
name = "receiving",
|
||||
set = newset(),
|
||||
cortn = {},
|
||||
stamp = stamp
|
||||
},
|
||||
}
|
||||
function dispatcher.tcp()
|
||||
return cowrap(dispatcher, socket.tcp())
|
||||
end
|
||||
return base.setmetatable(dispatcher, cometat)
|
||||
end
|
||||
|
||||
|
|
@ -0,0 +1,13 @@
|
|||
-----------------------------------------------------------------------------
|
||||
-- Little program to adjust end of line markers.
|
||||
-- LuaSocket sample files
|
||||
-- Author: Diego Nehab
|
||||
-----------------------------------------------------------------------------
|
||||
local mime = require("mime")
|
||||
local ltn12 = require("ltn12")
|
||||
local marker = '\n'
|
||||
if arg and arg[1] == '-d' then marker = '\r\n' end
|
||||
local filter = mime.normalize(marker)
|
||||
local source = ltn12.source.chain(ltn12.source.file(io.stdin), filter)
|
||||
local sink = ltn12.sink.file(io.stdout)
|
||||
ltn12.pump.all(source, sink)
|
||||
|
|
@ -0,0 +1,65 @@
|
|||
-- load our favourite library
|
||||
local dispatch = require("dispatch")
|
||||
local handler = dispatch.newhandler()
|
||||
|
||||
-- make sure the user knows how to invoke us
|
||||
if #arg < 1 then
|
||||
print("Usage")
|
||||
print(" lua forward.lua <iport:ohost:oport> ...")
|
||||
os.exit(1)
|
||||
end
|
||||
|
||||
-- function to move data from one socket to the other
|
||||
local function move(foo, bar)
|
||||
local live
|
||||
while 1 do
|
||||
local data, error, partial = foo:receive(2048)
|
||||
live = data or error == "timeout"
|
||||
data = data or partial
|
||||
local result, error = bar:send(data)
|
||||
if not live or not result then
|
||||
foo:close()
|
||||
bar:close()
|
||||
break
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
-- for each tunnel, start a new server
|
||||
for i, v in ipairs(arg) do
|
||||
-- capture forwarding parameters
|
||||
local _, _, iport, ohost, oport = string.find(v, "([^:]+):([^:]+):([^:]+)")
|
||||
assert(iport, "invalid arguments")
|
||||
-- create our server socket
|
||||
local server = assert(handler.tcp())
|
||||
assert(server:setoption("reuseaddr", true))
|
||||
assert(server:bind("*", iport))
|
||||
assert(server:listen(32))
|
||||
-- handler for the server object loops accepting new connections
|
||||
handler:start(function()
|
||||
while 1 do
|
||||
local client = assert(server:accept())
|
||||
assert(client:settimeout(0))
|
||||
-- for each new connection, start a new client handler
|
||||
handler:start(function()
|
||||
-- handler tries to connect to peer
|
||||
local peer = assert(handler.tcp())
|
||||
assert(peer:settimeout(0))
|
||||
assert(peer:connect(ohost, oport))
|
||||
-- if sucessful, starts a new handler to send data from
|
||||
-- client to peer
|
||||
handler:start(function()
|
||||
move(client, peer)
|
||||
end)
|
||||
-- afte starting new handler, enter in loop sending data from
|
||||
-- peer to client
|
||||
move(peer, client)
|
||||
end)
|
||||
end
|
||||
end)
|
||||
end
|
||||
|
||||
-- simply loop stepping the server
|
||||
while 1 do
|
||||
handler:step()
|
||||
end
|
||||
|
|
@ -0,0 +1,141 @@
|
|||
-----------------------------------------------------------------------------
|
||||
-- Little program to download files from URLs
|
||||
-- LuaSocket sample files
|
||||
-- Author: Diego Nehab
|
||||
-----------------------------------------------------------------------------
|
||||
local socket = require("socket")
|
||||
local http = require("socket.http")
|
||||
local ftp = require("socket.ftp")
|
||||
local url = require("socket.url")
|
||||
local ltn12 = require("ltn12")
|
||||
|
||||
-- formats a number of seconds into human readable form
|
||||
function nicetime(s)
|
||||
local l = "s"
|
||||
if s > 60 then
|
||||
s = s / 60
|
||||
l = "m"
|
||||
if s > 60 then
|
||||
s = s / 60
|
||||
l = "h"
|
||||
if s > 24 then
|
||||
s = s / 24
|
||||
l = "d" -- hmmm
|
||||
end
|
||||
end
|
||||
end
|
||||
if l == "s" then return string.format("%5.0f%s", s, l)
|
||||
else return string.format("%5.2f%s", s, l) end
|
||||
end
|
||||
|
||||
-- formats a number of bytes into human readable form
|
||||
function nicesize(b)
|
||||
local l = "B"
|
||||
if b > 1024 then
|
||||
b = b / 1024
|
||||
l = "KB"
|
||||
if b > 1024 then
|
||||
b = b / 1024
|
||||
l = "MB"
|
||||
if b > 1024 then
|
||||
b = b / 1024
|
||||
l = "GB" -- hmmm
|
||||
end
|
||||
end
|
||||
end
|
||||
return string.format("%7.2f%2s", b, l)
|
||||
end
|
||||
|
||||
-- returns a string with the current state of the download
|
||||
local remaining_s = "%s received, %s/s throughput, %2.0f%% done, %s remaining"
|
||||
local elapsed_s = "%s received, %s/s throughput, %s elapsed "
|
||||
function gauge(got, delta, size)
|
||||
local rate = got / delta
|
||||
if size and size >= 1 then
|
||||
return string.format(remaining_s, nicesize(got), nicesize(rate),
|
||||
100*got/size, nicetime((size-got)/rate))
|
||||
else
|
||||
return string.format(elapsed_s, nicesize(got),
|
||||
nicesize(rate), nicetime(delta))
|
||||
end
|
||||
end
|
||||
|
||||
-- creates a new instance of a receive_cb that saves to disk
|
||||
-- kind of copied from luasocket's manual callback examples
|
||||
function stats(size)
|
||||
local start = socket.gettime()
|
||||
local last = start
|
||||
local got = 0
|
||||
return function(chunk)
|
||||
-- elapsed time since start
|
||||
local current = socket.gettime()
|
||||
if chunk then
|
||||
-- total bytes received
|
||||
got = got + string.len(chunk)
|
||||
-- not enough time for estimate
|
||||
if current - last > 1 then
|
||||
io.stderr:write("\r", gauge(got, current - start, size))
|
||||
io.stderr:flush()
|
||||
last = current
|
||||
end
|
||||
else
|
||||
-- close up
|
||||
io.stderr:write("\r", gauge(got, current - start), "\n")
|
||||
end
|
||||
return chunk
|
||||
end
|
||||
end
|
||||
|
||||
-- determines the size of a http file
|
||||
function gethttpsize(u)
|
||||
local r, c, h = http.request {method = "HEAD", url = u}
|
||||
if c == 200 then
|
||||
return tonumber(h["content-length"])
|
||||
end
|
||||
end
|
||||
|
||||
-- downloads a file using the http protocol
|
||||
function getbyhttp(u, file)
|
||||
local save = ltn12.sink.file(file or io.stdout)
|
||||
-- only print feedback if output is not stdout
|
||||
if file then save = ltn12.sink.chain(stats(gethttpsize(u)), save) end
|
||||
local r, c, h, s = http.request {url = u, sink = save }
|
||||
if c ~= 200 then io.stderr:write(s or c, "\n") end
|
||||
end
|
||||
|
||||
-- downloads a file using the ftp protocol
|
||||
function getbyftp(u, file)
|
||||
local save = ltn12.sink.file(file or io.stdout)
|
||||
-- only print feedback if output is not stdout
|
||||
-- and we don't know how big the file is
|
||||
if file then save = ltn12.sink.chain(stats(), save) end
|
||||
local gett = url.parse(u)
|
||||
gett.sink = save
|
||||
gett.type = "i"
|
||||
local ret, err = ftp.get(gett)
|
||||
if err then print(err) end
|
||||
end
|
||||
|
||||
-- determines the scheme
|
||||
function getscheme(u)
|
||||
-- this is an heuristic to solve a common invalid url poblem
|
||||
if not string.find(u, "//") then u = "//" .. u end
|
||||
local parsed = url.parse(u, {scheme = "http"})
|
||||
return parsed.scheme
|
||||
end
|
||||
|
||||
-- gets a file either by http or ftp, saving as <name>
|
||||
function get(u, name)
|
||||
local fout = name and io.open(name, "wb")
|
||||
local scheme = getscheme(u)
|
||||
if scheme == "ftp" then getbyftp(u, fout)
|
||||
elseif scheme == "http" then getbyhttp(u, fout)
|
||||
else print("unknown scheme" .. scheme) end
|
||||
end
|
||||
|
||||
-- main program
|
||||
arg = arg or {}
|
||||
if #arg < 1 then
|
||||
io.write("Usage:\n lua get.lua <remote-url> [<local-file>]\n")
|
||||
os.exit(1)
|
||||
else get(arg[1], arg[2]) end
|
||||
|
|
@ -0,0 +1,17 @@
|
|||
<a href="http://www.cs.princeton.edu"> bla </a>
|
||||
<a href="http://www.princeton.edu"> bla </a>
|
||||
<a href="http://www.tecgraf.puc-rio.br"> bla </a>
|
||||
<a href="http://www.inf.puc-rio.br"> bla </a>
|
||||
<a href="http://www.puc-rio.br"> bla </a>
|
||||
<a href="http://www.impa.br"> bla </a>
|
||||
<a href="http://www.lua.org"> bla </a>
|
||||
<a href="http://www.lua-users.org"> bla </a>
|
||||
<a href="http://www.amazon.com"> bla </a>
|
||||
<a href="http://www.google.com"> bla </a>
|
||||
<a href="http://www.nytimes.com"> bla </a>
|
||||
<a href="http://www.bbc.co.uk"> bla </a>
|
||||
<a href="http://oglobo.globo.com"> bla </a>
|
||||
<a href="http://slate.msn.com"> bla </a>
|
||||
<a href="http://www.apple.com"> bla </a>
|
||||
<a href="http://www.microsoft.com"> bla </a>
|
||||
<a href="http://www.nasa.gov"> bla </a>
|
||||
|
|
@ -0,0 +1,323 @@
|
|||
-----------------------------------------------------------------------------
|
||||
-- LPD support for the Lua language
|
||||
-- LuaSocket toolkit.
|
||||
-- Author: David Burgess
|
||||
-- Modified by Diego Nehab, but David is in charge
|
||||
-----------------------------------------------------------------------------
|
||||
--[[
|
||||
if you have any questions: RFC 1179
|
||||
]]
|
||||
-- make sure LuaSocket is loaded
|
||||
local io = require("io")
|
||||
local base = _G
|
||||
local os = require("os")
|
||||
local math = require("math")
|
||||
local string = require("string")
|
||||
local socket = require("socket")
|
||||
local ltn12 = require("ltn12")
|
||||
module("socket.lp")
|
||||
|
||||
-- default port
|
||||
PORT = 515
|
||||
SERVER = os.getenv("SERVER_NAME") or os.getenv("COMPUTERNAME") or "localhost"
|
||||
PRINTER = os.getenv("PRINTER") or "printer"
|
||||
|
||||
local function connect(localhost, option)
|
||||
local host = option.host or SERVER
|
||||
local port = option.port or PORT
|
||||
local skt
|
||||
local try = socket.newtry(function() if skt then skt:close() end end)
|
||||
if option.localbind then
|
||||
-- bind to a local port (if we can)
|
||||
local localport = 721
|
||||
local done, err
|
||||
repeat
|
||||
skt = socket.try(socket.tcp())
|
||||
try(skt:settimeout(30))
|
||||
done, err = skt:bind(localhost, localport)
|
||||
if not done then
|
||||
localport = localport + 1
|
||||
skt:close()
|
||||
skt = nil
|
||||
else break end
|
||||
until localport > 731
|
||||
socket.try(skt, err)
|
||||
else skt = socket.try(socket.tcp()) end
|
||||
try(skt:connect(host, port))
|
||||
return { skt = skt, try = try }
|
||||
end
|
||||
|
||||
--[[
|
||||
RFC 1179
|
||||
5.3 03 - Send queue state (short)
|
||||
|
||||
+----+-------+----+------+----+
|
||||
| 03 | Queue | SP | List | LF |
|
||||
+----+-------+----+------+----+
|
||||
Command code - 3
|
||||
Operand 1 - Printer queue name
|
||||
Other operands - User names or job numbers
|
||||
|
||||
If the user names or job numbers or both are supplied then only those
|
||||
jobs for those users or with those numbers will be sent.
|
||||
|
||||
The response is an ASCII stream which describes the printer queue.
|
||||
The stream continues until the connection closes. Ends of lines are
|
||||
indicated with ASCII LF control characters. The lines may also
|
||||
contain ASCII HT control characters.
|
||||
|
||||
5.4 04 - Send queue state (long)
|
||||
|
||||
+----+-------+----+------+----+
|
||||
| 04 | Queue | SP | List | LF |
|
||||
+----+-------+----+------+----+
|
||||
Command code - 4
|
||||
Operand 1 - Printer queue name
|
||||
Other operands - User names or job numbers
|
||||
|
||||
If the user names or job numbers or both are supplied then only those
|
||||
jobs for those users or with those numbers will be sent.
|
||||
|
||||
The response is an ASCII stream which describes the printer queue.
|
||||
The stream continues until the connection closes. Ends of lines are
|
||||
indicated with ASCII LF control characters. The lines may also
|
||||
contain ASCII HT control characters.
|
||||
]]
|
||||
|
||||
-- gets server acknowledement
|
||||
local function recv_ack(con)
|
||||
local ack = con.skt:receive(1)
|
||||
con.try(string.char(0) == ack, "failed to receive server acknowledgement")
|
||||
end
|
||||
|
||||
-- sends client acknowledement
|
||||
local function send_ack(con)
|
||||
local sent = con.skt:send(string.char(0))
|
||||
con.try(sent == 1, "failed to send acknowledgement")
|
||||
end
|
||||
|
||||
-- sends queue request
|
||||
-- 5.2 02 - Receive a printer job
|
||||
--
|
||||
-- +----+-------+----+
|
||||
-- | 02 | Queue | LF |
|
||||
-- +----+-------+----+
|
||||
-- Command code - 2
|
||||
-- Operand - Printer queue name
|
||||
--
|
||||
-- Receiving a job is controlled by a second level of commands. The
|
||||
-- daemon is given commands by sending them over the same connection.
|
||||
-- The commands are described in the next section (6).
|
||||
--
|
||||
-- After this command is sent, the client must read an acknowledgement
|
||||
-- octet from the daemon. A positive acknowledgement is an octet of
|
||||
-- zero bits. A negative acknowledgement is an octet of any other
|
||||
-- pattern.
|
||||
local function send_queue(con, queue)
|
||||
queue = queue or PRINTER
|
||||
local str = string.format("\2%s\10", queue)
|
||||
local sent = con.skt:send(str)
|
||||
con.try(sent == string.len(str), "failed to send print request")
|
||||
recv_ack(con)
|
||||
end
|
||||
|
||||
-- sends control file
|
||||
-- 6.2 02 - Receive control file
|
||||
--
|
||||
-- +----+-------+----+------+----+
|
||||
-- | 02 | Count | SP | Name | LF |
|
||||
-- +----+-------+----+------+----+
|
||||
-- Command code - 2
|
||||
-- Operand 1 - Number of bytes in control file
|
||||
-- Operand 2 - Name of control file
|
||||
--
|
||||
-- The control file must be an ASCII stream with the ends of lines
|
||||
-- indicated by ASCII LF. The total number of bytes in the stream is
|
||||
-- sent as the first operand. The name of the control file is sent as
|
||||
-- the second. It should start with ASCII "cfA", followed by a three
|
||||
-- digit job number, followed by the host name which has constructed the
|
||||
-- control file. Acknowledgement processing must occur as usual after
|
||||
-- the command is sent.
|
||||
--
|
||||
-- The next "Operand 1" octets over the same TCP connection are the
|
||||
-- intended contents of the control file. Once all of the contents have
|
||||
-- been delivered, an octet of zero bits is sent as an indication that
|
||||
-- the file being sent is complete. A second level of acknowledgement
|
||||
-- processing must occur at this point.
|
||||
|
||||
-- sends data file
|
||||
-- 6.3 03 - Receive data file
|
||||
--
|
||||
-- +----+-------+----+------+----+
|
||||
-- | 03 | Count | SP | Name | LF |
|
||||
-- +----+-------+----+------+----+
|
||||
-- Command code - 3
|
||||
-- Operand 1 - Number of bytes in data file
|
||||
-- Operand 2 - Name of data file
|
||||
--
|
||||
-- The data file may contain any 8 bit values at all. The total number
|
||||
-- of bytes in the stream may be sent as the first operand, otherwise
|
||||
-- the field should be cleared to 0. The name of the data file should
|
||||
-- start with ASCII "dfA". This should be followed by a three digit job
|
||||
-- number. The job number should be followed by the host name which has
|
||||
-- constructed the data file. Interpretation of the contents of the
|
||||
-- data file is determined by the contents of the corresponding control
|
||||
-- file. If a data file length has been specified, the next "Operand 1"
|
||||
-- octets over the same TCP connection are the intended contents of the
|
||||
-- data file. In this case, once all of the contents have been
|
||||
-- delivered, an octet of zero bits is sent as an indication that the
|
||||
-- file being sent is complete. A second level of acknowledgement
|
||||
-- processing must occur at this point.
|
||||
|
||||
|
||||
local function send_hdr(con, control)
|
||||
local sent = con.skt:send(control)
|
||||
con.try(sent and sent >= 1 , "failed to send header file")
|
||||
recv_ack(con)
|
||||
end
|
||||
|
||||
local function send_control(con, control)
|
||||
local sent = con.skt:send(control)
|
||||
con.try(sent and sent >= 1, "failed to send control file")
|
||||
send_ack(con)
|
||||
end
|
||||
|
||||
local function send_data(con,fh,size)
|
||||
local buf
|
||||
while size > 0 do
|
||||
buf,message = fh:read(8192)
|
||||
if buf then
|
||||
st = con.try(con.skt:send(buf))
|
||||
size = size - st
|
||||
else
|
||||
con.try(size == 0, "file size mismatch")
|
||||
end
|
||||
end
|
||||
recv_ack(con) -- note the double acknowledgement
|
||||
send_ack(con)
|
||||
recv_ack(con)
|
||||
return size
|
||||
end
|
||||
|
||||
|
||||
--[[
|
||||
local control_dflt = {
|
||||
"H"..string.sub(socket.hostname,1,31).."\10", -- host
|
||||
"C"..string.sub(socket.hostname,1,31).."\10", -- class
|
||||
"J"..string.sub(filename,1,99).."\10", -- jobname
|
||||
"L"..string.sub(user,1,31).."\10", -- print banner page
|
||||
"I"..tonumber(indent).."\10", -- indent column count ('f' only)
|
||||
"M"..string.sub(mail,1,128).."\10", -- mail when printed user@host
|
||||
"N"..string.sub(filename,1,131).."\10", -- name of source file
|
||||
"P"..string.sub(user,1,31).."\10", -- user name
|
||||
"T"..string.sub(title,1,79).."\10", -- title for banner ('p' only)
|
||||
"W"..tonumber(width or 132).."\10", -- width of print f,l,p only
|
||||
|
||||
"f"..file.."\10", -- formatted print (remove control chars)
|
||||
"l"..file.."\10", -- print
|
||||
"o"..file.."\10", -- postscript
|
||||
"p"..file.."\10", -- pr format - requires T, L
|
||||
"r"..file.."\10", -- fortran format
|
||||
"U"..file.."\10", -- Unlink (data file only)
|
||||
}
|
||||
]]
|
||||
|
||||
-- generate a varying job number
|
||||
local seq = 0
|
||||
local function newjob(connection)
|
||||
seq = seq + 1
|
||||
return math.floor(socket.gettime() * 1000 + seq)%1000
|
||||
end
|
||||
|
||||
|
||||
local format_codes = {
|
||||
binary = 'l',
|
||||
text = 'f',
|
||||
ps = 'o',
|
||||
pr = 'p',
|
||||
fortran = 'r',
|
||||
l = 'l',
|
||||
r = 'r',
|
||||
o = 'o',
|
||||
p = 'p',
|
||||
f = 'f'
|
||||
}
|
||||
|
||||
-- lp.send{option}
|
||||
-- requires option.file
|
||||
|
||||
send = socket.protect(function(option)
|
||||
socket.try(option and base.type(option) == "table", "invalid options")
|
||||
local file = option.file
|
||||
socket.try(file, "invalid file name")
|
||||
local fh = socket.try(io.open(file,"rb"))
|
||||
local datafile_size = fh:seek("end") -- get total size
|
||||
fh:seek("set") -- go back to start of file
|
||||
local localhost = socket.dns.gethostname() or os.getenv("COMPUTERNAME")
|
||||
or "localhost"
|
||||
local con = connect(localhost, option)
|
||||
-- format the control file
|
||||
local jobno = newjob()
|
||||
local localip = socket.dns.toip(localhost)
|
||||
localhost = string.sub(localhost,1,31)
|
||||
local user = string.sub(option.user or os.getenv("LPRUSER") or
|
||||
os.getenv("USERNAME") or os.getenv("USER") or "anonymous", 1,31)
|
||||
local lpfile = string.format("dfA%3.3d%-s", jobno, localhost);
|
||||
local fmt = format_codes[option.format] or 'l'
|
||||
local class = string.sub(option.class or localip or localhost,1,31)
|
||||
local _,_,ctlfn = string.find(file,".*[%/%\\](.*)")
|
||||
ctlfn = string.sub(ctlfn or file,1,131)
|
||||
local cfile =
|
||||
string.format("H%-s\nC%-s\nJ%-s\nP%-s\n%.1s%-s\nU%-s\nN%-s\n",
|
||||
localhost,
|
||||
class,
|
||||
option.job or "LuaSocket",
|
||||
user,
|
||||
fmt, lpfile,
|
||||
lpfile,
|
||||
ctlfn); -- mandatory part of ctl file
|
||||
if (option.banner) then cfile = cfile .. 'L'..user..'\10' end
|
||||
if (option.indent) then cfile = cfile .. 'I'..base.tonumber(option.indent)..'\10' end
|
||||
if (option.mail) then cfile = cfile .. 'M'..string.sub((option.mail),1,128)..'\10' end
|
||||
if (fmt == 'p' and option.title) then cfile = cfile .. 'T'..string.sub((option.title),1,79)..'\10' end
|
||||
if ((fmt == 'p' or fmt == 'l' or fmt == 'f') and option.width) then
|
||||
cfile = cfile .. 'W'..base.tonumber(option,width)..'\10'
|
||||
end
|
||||
|
||||
con.skt:settimeout(option.timeout or 65)
|
||||
-- send the queue header
|
||||
send_queue(con, option.queue)
|
||||
-- send the control file header
|
||||
local cfilecmd = string.format("\2%d cfA%3.3d%-s\n",string.len(cfile), jobno, localhost);
|
||||
send_hdr(con,cfilecmd)
|
||||
|
||||
-- send the control file
|
||||
send_control(con,cfile)
|
||||
|
||||
-- send the data file header
|
||||
local dfilecmd = string.format("\3%d dfA%3.3d%-s\n",datafile_size, jobno, localhost);
|
||||
send_hdr(con,dfilecmd)
|
||||
|
||||
-- send the data file
|
||||
send_data(con,fh,datafile_size)
|
||||
fh:close()
|
||||
con.skt:close();
|
||||
return jobno, datafile_size
|
||||
end)
|
||||
|
||||
--
|
||||
-- lp.query({host=,queue=printer|'*', format='l'|'s', list=})
|
||||
--
|
||||
query = socket.protect(function(p)
|
||||
p = p or {}
|
||||
local localhost = socket.dns.gethostname() or os.getenv("COMPUTERNAME")
|
||||
or "localhost"
|
||||
local con = connect(localhost,p)
|
||||
local fmt
|
||||
if string.sub(p.format or 's',1,1) == 's' then fmt = 3 else fmt = 4 end
|
||||
con.try(con.skt:send(string.format("%c%s %s\n", fmt, p.queue or "*",
|
||||
p.list or "")))
|
||||
local data = con.try(con.skt:receive("*a"))
|
||||
con.skt:close()
|
||||
return data
|
||||
end)
|
||||
|
|
@ -0,0 +1,23 @@
|
|||
-----------------------------------------------------------------------------
|
||||
-- Little program to convert to and from Quoted-Printable
|
||||
-- LuaSocket sample files
|
||||
-- Author: Diego Nehab
|
||||
-----------------------------------------------------------------------------
|
||||
local ltn12 = require("ltn12")
|
||||
local mime = require("mime")
|
||||
local convert
|
||||
arg = arg or {}
|
||||
local mode = arg and arg[1] or "-et"
|
||||
if mode == "-et" then
|
||||
local normalize = mime.normalize()
|
||||
local qp = mime.encode("quoted-printable")
|
||||
local wrap = mime.wrap("quoted-printable")
|
||||
convert = ltn12.filter.chain(normalize, qp, wrap)
|
||||
elseif mode == "-eb" then
|
||||
local qp = mime.encode("quoted-printable", "binary")
|
||||
local wrap = mime.wrap("quoted-printable")
|
||||
convert = ltn12.filter.chain(qp, wrap)
|
||||
else convert = mime.decode("quoted-printable") end
|
||||
local source = ltn12.source.chain(ltn12.source.file(io.stdin), convert)
|
||||
local sink = ltn12.sink.file(io.stdout)
|
||||
ltn12.pump.all(source, sink)
|
||||
|
|
@ -0,0 +1,154 @@
|
|||
-----------------------------------------------------------------------------
|
||||
-- TFTP support for the Lua language
|
||||
-- LuaSocket toolkit.
|
||||
-- Author: Diego Nehab
|
||||
-----------------------------------------------------------------------------
|
||||
|
||||
-----------------------------------------------------------------------------
|
||||
-- Load required files
|
||||
-----------------------------------------------------------------------------
|
||||
local base = _G
|
||||
local table = require("table")
|
||||
local math = require("math")
|
||||
local string = require("string")
|
||||
local socket = require("socket")
|
||||
local ltn12 = require("ltn12")
|
||||
local url = require("socket.url")
|
||||
module("socket.tftp")
|
||||
|
||||
-----------------------------------------------------------------------------
|
||||
-- Program constants
|
||||
-----------------------------------------------------------------------------
|
||||
local char = string.char
|
||||
local byte = string.byte
|
||||
|
||||
PORT = 69
|
||||
local OP_RRQ = 1
|
||||
local OP_WRQ = 2
|
||||
local OP_DATA = 3
|
||||
local OP_ACK = 4
|
||||
local OP_ERROR = 5
|
||||
local OP_INV = {"RRQ", "WRQ", "DATA", "ACK", "ERROR"}
|
||||
|
||||
-----------------------------------------------------------------------------
|
||||
-- Packet creation functions
|
||||
-----------------------------------------------------------------------------
|
||||
local function RRQ(source, mode)
|
||||
return char(0, OP_RRQ) .. source .. char(0) .. mode .. char(0)
|
||||
end
|
||||
|
||||
local function WRQ(source, mode)
|
||||
return char(0, OP_RRQ) .. source .. char(0) .. mode .. char(0)
|
||||
end
|
||||
|
||||
local function ACK(block)
|
||||
local low, high
|
||||
low = math.mod(block, 256)
|
||||
high = (block - low)/256
|
||||
return char(0, OP_ACK, high, low)
|
||||
end
|
||||
|
||||
local function get_OP(dgram)
|
||||
local op = byte(dgram, 1)*256 + byte(dgram, 2)
|
||||
return op
|
||||
end
|
||||
|
||||
-----------------------------------------------------------------------------
|
||||
-- Packet analysis functions
|
||||
-----------------------------------------------------------------------------
|
||||
local function split_DATA(dgram)
|
||||
local block = byte(dgram, 3)*256 + byte(dgram, 4)
|
||||
local data = string.sub(dgram, 5)
|
||||
return block, data
|
||||
end
|
||||
|
||||
local function get_ERROR(dgram)
|
||||
local code = byte(dgram, 3)*256 + byte(dgram, 4)
|
||||
local msg
|
||||
_,_, msg = string.find(dgram, "(.*)\000", 5)
|
||||
return string.format("error code %d: %s", code, msg)
|
||||
end
|
||||
|
||||
-----------------------------------------------------------------------------
|
||||
-- The real work
|
||||
-----------------------------------------------------------------------------
|
||||
local function tget(gett)
|
||||
local retries, dgram, sent, datahost, dataport, code
|
||||
local last = 0
|
||||
socket.try(gett.host, "missing host")
|
||||
local con = socket.try(socket.udp())
|
||||
local try = socket.newtry(function() con:close() end)
|
||||
-- convert from name to ip if needed
|
||||
gett.host = try(socket.dns.toip(gett.host))
|
||||
con:settimeout(1)
|
||||
-- first packet gives data host/port to be used for data transfers
|
||||
local path = string.gsub(gett.path or "", "^/", "")
|
||||
path = url.unescape(path)
|
||||
retries = 0
|
||||
repeat
|
||||
sent = try(con:sendto(RRQ(path, "octet"), gett.host, gett.port))
|
||||
dgram, datahost, dataport = con:receivefrom()
|
||||
retries = retries + 1
|
||||
until dgram or datahost ~= "timeout" or retries > 5
|
||||
try(dgram, datahost)
|
||||
-- associate socket with data host/port
|
||||
try(con:setpeername(datahost, dataport))
|
||||
-- default sink
|
||||
local sink = gett.sink or ltn12.sink.null()
|
||||
-- process all data packets
|
||||
while 1 do
|
||||
-- decode packet
|
||||
code = get_OP(dgram)
|
||||
try(code ~= OP_ERROR, get_ERROR(dgram))
|
||||
try(code == OP_DATA, "unhandled opcode " .. code)
|
||||
-- get data packet parts
|
||||
local block, data = split_DATA(dgram)
|
||||
-- if not repeated, write
|
||||
if block == last+1 then
|
||||
try(sink(data))
|
||||
last = block
|
||||
end
|
||||
-- last packet brings less than 512 bytes of data
|
||||
if string.len(data) < 512 then
|
||||
try(con:send(ACK(block)))
|
||||
try(con:close())
|
||||
try(sink(nil))
|
||||
return 1
|
||||
end
|
||||
-- get the next packet
|
||||
retries = 0
|
||||
repeat
|
||||
sent = try(con:send(ACK(last)))
|
||||
dgram, err = con:receive()
|
||||
retries = retries + 1
|
||||
until dgram or err ~= "timeout" or retries > 5
|
||||
try(dgram, err)
|
||||
end
|
||||
end
|
||||
|
||||
local default = {
|
||||
port = PORT,
|
||||
path ="/",
|
||||
scheme = "tftp"
|
||||
}
|
||||
|
||||
local function parse(u)
|
||||
local t = socket.try(url.parse(u, default))
|
||||
socket.try(t.scheme == "tftp", "invalid scheme '" .. t.scheme .. "'")
|
||||
socket.try(t.host, "invalid host")
|
||||
return t
|
||||
end
|
||||
|
||||
local function sget(u)
|
||||
local gett = parse(u)
|
||||
local t = {}
|
||||
gett.sink = ltn12.sink.table(t)
|
||||
tget(gett)
|
||||
return table.concat(t)
|
||||
end
|
||||
|
||||
get = socket.protect(function(gett)
|
||||
if base.type(gett) == "string" then return sget(gett)
|
||||
else return tget(gett) end
|
||||
end)
|
||||
|
||||
|
|
@ -0,0 +1,4 @@
|
|||
local CRLF = "\013\010"
|
||||
local input = source.chain(source.file(io.stdin), normalize(CRLF))
|
||||
local output = sink.file(io.stdout)
|
||||
pump.all(input, output)
|
||||
|
|
@ -0,0 +1,17 @@
|
|||
function pump.step(src, snk)
|
||||
local chunk, src_err = src()
|
||||
local ret, snk_err = snk(chunk, src_err)
|
||||
if chunk and ret then return 1
|
||||
else return nil, src_err or snk_err end
|
||||
end
|
||||
|
||||
function pump.all(src, snk, step)
|
||||
step = step or pump.step
|
||||
while true do
|
||||
local ret, err = step(src, snk)
|
||||
if not ret then
|
||||
if err then return nil, err
|
||||
else return 1 end
|
||||
end
|
||||
end
|
||||
end
|
||||
|
|
@ -0,0 +1,7 @@
|
|||
local input = source.chain(
|
||||
source.file(io.open("input.bin", "rb")),
|
||||
encode("base64"))
|
||||
local output = sink.chain(
|
||||
wrap(76),
|
||||
sink.file(io.open("output.b64", "w")))
|
||||
pump.all(input, output)
|
||||
|
|
@ -0,0 +1,34 @@
|
|||
local smtp = require"socket.smtp"
|
||||
local mime = require"mime"
|
||||
local ltn12 = require"ltn12"
|
||||
|
||||
CRLF = "\013\010"
|
||||
|
||||
local message = smtp.message{
|
||||
headers = {
|
||||
from = "Sicrano <sicrano@example.com>",
|
||||
to = "Fulano <fulano@example.com>",
|
||||
subject = "A message with an attachment"},
|
||||
body = {
|
||||
preamble = "Hope you can see the attachment" .. CRLF,
|
||||
[1] = {
|
||||
body = "Here is our logo" .. CRLF},
|
||||
[2] = {
|
||||
headers = {
|
||||
["content-type"] = 'image/png; name="luasocket.png"',
|
||||
["content-disposition"] =
|
||||
'attachment; filename="luasocket.png"',
|
||||
["content-description"] = 'LuaSocket logo',
|
||||
["content-transfer-encoding"] = "BASE64"},
|
||||
body = ltn12.source.chain(
|
||||
ltn12.source.file(io.open("luasocket.png", "rb")),
|
||||
ltn12.filter.chain(
|
||||
mime.encode("base64"),
|
||||
mime.wrap()))}}}
|
||||
|
||||
assert(smtp.send{
|
||||
rcpt = "<diego@cs.princeton.edu>",
|
||||
from = "<diego@cs.princeton.edu>",
|
||||
server = "localhost",
|
||||
port = 2525,
|
||||
source = message})
|
||||
|
|
@ -0,0 +1,11 @@
|
|||
function filter.cycle(lowlevel, context, extra)
|
||||
return function(chunk)
|
||||
local ret
|
||||
ret, context = lowlevel(context, chunk, extra)
|
||||
return ret
|
||||
end
|
||||
end
|
||||
|
||||
function normalize(marker)
|
||||
return filter.cycle(eol, 0, marker)
|
||||
end
|
||||
|
|
@ -0,0 +1,15 @@
|
|||
local function chainpair(f1, f2)
|
||||
return function(chunk)
|
||||
local ret = f2(f1(chunk))
|
||||
if chunk then return ret
|
||||
else return (ret or "") .. (f2() or "") end
|
||||
end
|
||||
end
|
||||
|
||||
function filter.chain(...)
|
||||
local f = select(1, ...)
|
||||
for i = 2, select('#', ...) do
|
||||
f = chainpair(f, select(i, ...))
|
||||
end
|
||||
return f
|
||||
end
|
||||
|
|
@ -0,0 +1,5 @@
|
|||
local qp = filter.chain(normalize(CRLF), encode("quoted-printable"),
|
||||
wrap("quoted-printable"))
|
||||
local input = source.chain(source.file(io.stdin), qp)
|
||||
local output = sink.file(io.stdout)
|
||||
pump.all(input, output)
|
||||
|
|
@ -0,0 +1,15 @@
|
|||
function source.empty(err)
|
||||
return function()
|
||||
return nil, err
|
||||
end
|
||||
end
|
||||
|
||||
function source.file(handle, io_err)
|
||||
if handle then
|
||||
return function()
|
||||
local chunk = handle:read(20)
|
||||
if not chunk then handle:close() end
|
||||
return chunk
|
||||
end
|
||||
else return source.empty(io_err or "unable to open file") end
|
||||
end
|
||||
|
|
@ -0,0 +1,14 @@
|
|||
function source.chain(src, f)
|
||||
return function()
|
||||
if not src then
|
||||
return nil
|
||||
end
|
||||
local chunk, err = src()
|
||||
if not chunk then
|
||||
src = nil
|
||||
return f(nil)
|
||||
else
|
||||
return f(chunk)
|
||||
end
|
||||
end
|
||||
end
|
||||
|
|
@ -0,0 +1,16 @@
|
|||
function sink.table(t)
|
||||
t = t or {}
|
||||
local f = function(chunk, err)
|
||||
if chunk then table.insert(t, chunk) end
|
||||
return 1
|
||||
end
|
||||
return f, t
|
||||
end
|
||||
|
||||
local function null()
|
||||
return 1
|
||||
end
|
||||
|
||||
function sink.null()
|
||||
return null
|
||||
end
|
||||
|
|
@ -0,0 +1,5 @@
|
|||
local input = source.file(io.stdin)
|
||||
local output, t = sink.table()
|
||||
output = sink.chain(normalize(CRLF), output)
|
||||
pump.all(input, output)
|
||||
io.write(table.concat(t))
|
||||
|
|
@ -0,0 +1,3 @@
|
|||
for chunk in source.file(io.stdin) do
|
||||
io.write(chunk)
|
||||
end
|
||||
|
|
@ -0,0 +1,54 @@
|
|||
#include "lua.h"
|
||||
#include "lauxlib.h"
|
||||
|
||||
#define CR '\xD'
|
||||
#define LF '\xA'
|
||||
#define CRLF "\xD\xA"
|
||||
|
||||
#define candidate(c) (c == CR || c == LF)
|
||||
static int pushchar(int c, int last, const char *marker,
|
||||
luaL_Buffer *buffer) {
|
||||
if (candidate(c)) {
|
||||
if (candidate(last)) {
|
||||
if (c == last)
|
||||
luaL_addstring(buffer, marker);
|
||||
return 0;
|
||||
} else {
|
||||
luaL_addstring(buffer, marker);
|
||||
return c;
|
||||
}
|
||||
} else {
|
||||
luaL_putchar(buffer, c);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
static int eol(lua_State *L) {
|
||||
int context = luaL_checkint(L, 1);
|
||||
size_t isize = 0;
|
||||
const char *input = luaL_optlstring(L, 2, NULL, &isize);
|
||||
const char *last = input + isize;
|
||||
const char *marker = luaL_optstring(L, 3, CRLF);
|
||||
luaL_Buffer buffer;
|
||||
luaL_buffinit(L, &buffer);
|
||||
if (!input) {
|
||||
lua_pushnil(L);
|
||||
lua_pushnumber(L, 0);
|
||||
return 2;
|
||||
}
|
||||
while (input < last)
|
||||
context = pushchar(*input++, context, marker, &buffer);
|
||||
luaL_pushresult(&buffer);
|
||||
lua_pushnumber(L, context);
|
||||
return 2;
|
||||
}
|
||||
|
||||
static luaL_reg func[] = {
|
||||
{ "eol", eol },
|
||||
{ NULL, NULL }
|
||||
};
|
||||
|
||||
int luaopen_gem(lua_State *L) {
|
||||
luaL_openlib(L, "gem", func, 0);
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -0,0 +1,206 @@
|
|||
iVBORw0KGgoAAAANSUhEUgAAAIAAAACACAIAAABMXPacAAAtU0lEQVR42u19eXRURdb4rarXa5LO
|
||||
RshKEshC2MLOBIjsCoMLGJhRPnUEcUGZEX7j4Iw6zqd+zjkzzowL6gzKMOoBRHAAPyQKUZQlxLAk
|
||||
EIEkQkhCyEoISegs3f1eVf3+qPTj0Z3udEJImN/Pe/rkdF6/V6/q3qp7b92tEOccfoT+A9zfHfj/
|
||||
HX4kQD/DjwToZ/iRAP0MPxKgn+FHAvQz/EiAfgapvzvQQ3DfviCE+rtTPYH/AAKouEYIcc4ForUX
|
||||
tXeKexhj6k8IIe2DvdUl0SYAcN7RGYQ63oAQ4hx8fBu6BXfC6vBcsHyDeNRi7cYboZQjBIRgl/lB
|
||||
KQcAQnyl+q1IAC9YU7/s2bOnsrKSUupwOHQ63cMPP2wymRhjGOOrV6/m5ORYLJbg4OABAwZYLBaD
|
||||
waBtQUsD34mqRT0hHc/abEpNjbWlxYEQCgw0RET463QEABjjjHFfyND/LEg737XsQpblhoaGioqK
|
||||
CxcunD9/fv78+ampqepgZFk2mUwBAQEYY6PRSAhRG7Tb7cXFxXa73W63W63Wn/zkJ4sXL1YfVHGB
|
||||
EFI5VZc0EDcwxjnnkoRbWhw7dxZt316Yn19TW9siyxQADAZddHRAWlrMffeNnDcvUa8nlDKEAGNv
|
||||
7ffbClCnoYoFFRFiIufn53/88cfBwcERERERERHjxo2LjIz0ZbaqFLXb7ZcuXZIkKSoqShAYY7xn
|
||||
z576+vpJkybFxcUZjUZfOJKKfQBACP75z/yXXtpfXX0JAAFIAAQAAXAADsAAZAA0dGjMa6/Nueee
|
||||
FEoZQsgLDfqTAFqWIstyRUVFXFycJEniJ6vV2tTUFBUVRQhxkb0q2TTS7xr9tNxG/bdjtAjl5eXl
|
||||
5ubW1dUhhJKTkzMyMkwmk0p4AMAYq91Tv1DKCMENDW0PPLBj797vEdJjrAfgjF2HP+d8B8YcAMry
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||||
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||||
Binary file not shown.
|
After Width: | Height: | Size: 12 KiB |
|
|
@ -0,0 +1,695 @@
|
|||
\documentclass[10pt]{article}
|
||||
\usepackage{fancyvrb}
|
||||
\usepackage{url}
|
||||
\DefineVerbatimEnvironment{lua}{Verbatim}{fontsize=\small,commandchars=\@\#\%}
|
||||
\DefineVerbatimEnvironment{C}{Verbatim}{fontsize=\small,commandchars=\@\#\%}
|
||||
\DefineVerbatimEnvironment{mime}{Verbatim}{fontsize=\small,commandchars=\$\#\%}
|
||||
\newcommand{\stick}[1]{\vbox{\setlength{\parskip}{0pt}#1}}
|
||||
\newcommand{\bl}{\ensuremath{\mathtt{\backslash}}}
|
||||
\newcommand{\CR}{\texttt{CR}}
|
||||
\newcommand{\LF}{\texttt{LF}}
|
||||
\newcommand{\CRLF}{\texttt{CR~LF}}
|
||||
\newcommand{\nil}{\texttt{nil}}
|
||||
|
||||
\title{Filters, sources, sinks, and pumps\\
|
||||
{\large or Functional programming for the rest of us}}
|
||||
\author{Diego Nehab}
|
||||
|
||||
\begin{document}
|
||||
|
||||
\maketitle
|
||||
|
||||
\begin{abstract}
|
||||
Certain data processing operations can be implemented in the
|
||||
form of filters. A filter is a function that can process
|
||||
data received in consecutive invocations, returning partial
|
||||
results each time it is called. Examples of operations that
|
||||
can be implemented as filters include the end-of-line
|
||||
normalization for text, Base64 and Quoted-Printable transfer
|
||||
content encodings, the breaking of text into lines, SMTP
|
||||
dot-stuffing, and there are many others. Filters become
|
||||
even more powerful when we allow them to be chained together
|
||||
to create composite filters. In this context, filters can be
|
||||
seen as the internal links in a chain of data transformations.
|
||||
Sources and sinks are the corresponding end points in these
|
||||
chains. A source is a function that produces data, chunk by
|
||||
chunk, and a sink is a function that takes data, chunk by
|
||||
chunk. Finally, pumps are procedures that actively drive
|
||||
data from a source to a sink, and indirectly through all
|
||||
intervening filters. In this article, we describe the design of an
|
||||
elegant interface for filters, sources, sinks, chains, and
|
||||
pumps, and we illustrate each step with concrete examples.
|
||||
\end{abstract}
|
||||
|
||||
\section{Introduction}
|
||||
|
||||
Within the realm of networking applications, we are often
|
||||
required to apply transformations to streams of data. Examples
|
||||
include the end-of-line normalization for text, Base64 and
|
||||
Quoted-Printable transfer content encodings, breaking text
|
||||
into lines with a maximum number of columns, SMTP
|
||||
dot-stuffing, \texttt{gzip} compression, HTTP chunked
|
||||
transfer coding, and the list goes on.
|
||||
|
||||
Many complex tasks require a combination of two or more such
|
||||
transformations, and therefore a general mechanism for
|
||||
promoting reuse is desirable. In the process of designing
|
||||
\texttt{LuaSocket~2.0}, we repeatedly faced this problem.
|
||||
The solution we reached proved to be very general and
|
||||
convenient. It is based on the concepts of filters, sources,
|
||||
sinks, and pumps, which we introduce below.
|
||||
|
||||
\emph{Filters} are functions that can be repeatedly invoked
|
||||
with chunks of input, successively returning processed
|
||||
chunks of output. Naturally, the result of
|
||||
concatenating all the output chunks must be the same as the
|
||||
result of applying the filter to the concatenation of all
|
||||
input chunks. In fancier language, filters \emph{commute}
|
||||
with the concatenation operator. More importantly, filters
|
||||
must handle input data correctly no matter how the stream
|
||||
has been split into chunks.
|
||||
|
||||
A \emph{chain} is a function that transparently combines the
|
||||
effect of one or more filters. The interface of a chain is
|
||||
indistinguishable from the interface of its component
|
||||
filters. This allows a chained filter to be used wherever
|
||||
an atomic filter is accepted. In particular, chains can be
|
||||
themselves chained to create arbitrarily complex operations.
|
||||
|
||||
Filters can be seen as internal nodes in a network through
|
||||
which data will flow, potentially being transformed many
|
||||
times along the way. Chains connect these nodes together.
|
||||
The initial and final nodes of the network are
|
||||
\emph{sources} and \emph{sinks}, respectively. Less
|
||||
abstractly, a source is a function that produces new chunks
|
||||
of data every time it is invoked. Conversely, sinks are
|
||||
functions that give a final destination to the chunks of
|
||||
data they receive in sucessive calls. Naturally, sources
|
||||
and sinks can also be chained with filters to produce
|
||||
filtered sources and sinks.
|
||||
|
||||
Finally, filters, chains, sources, and sinks are all passive
|
||||
entities: they must be repeatedly invoked in order for
|
||||
anything to happen. \emph{Pumps} provide the driving force
|
||||
that pushes data through the network, from a source to a
|
||||
sink, and indirectly through all intervening filters.
|
||||
|
||||
In the following sections, we start with a simplified
|
||||
interface, which we later refine. The evolution we present
|
||||
is not contrived: it recreates the steps we ourselves
|
||||
followed as we consolidated our understanding of these
|
||||
concepts within our application domain.
|
||||
|
||||
\subsection{A simple example}
|
||||
|
||||
The end-of-line normalization of text is a good
|
||||
example to motivate our initial filter interface.
|
||||
Assume we are given text in an unknown end-of-line
|
||||
convention (including possibly mixed conventions) out of the
|
||||
commonly found Unix (\LF), Mac OS (\CR), and
|
||||
DOS (\CRLF) conventions. We would like to be able to
|
||||
use the folowing code to normalize the end-of-line markers:
|
||||
\begin{quote}
|
||||
\begin{lua}
|
||||
@stick#
|
||||
local CRLF = "\013\010"
|
||||
local input = source.chain(source.file(io.stdin), normalize(CRLF))
|
||||
local output = sink.file(io.stdout)
|
||||
pump.all(input, output)
|
||||
%
|
||||
\end{lua}
|
||||
\end{quote}
|
||||
|
||||
This program should read data from the standard input stream
|
||||
and normalize the end-of-line markers to the canonic
|
||||
\CRLF\ marker, as defined by the MIME standard.
|
||||
Finally, the normalized text should be sent to the standard output
|
||||
stream. We use a \emph{file source} that produces data from
|
||||
standard input, and chain it with a filter that normalizes
|
||||
the data. The pump then repeatedly obtains data from the
|
||||
source, and passes it to the \emph{file sink}, which sends
|
||||
it to the standard output.
|
||||
|
||||
In the code above, the \texttt{normalize} \emph{factory} is a
|
||||
function that creates our normalization filter, which
|
||||
replaces any end-of-line marker with the canonic marker.
|
||||
The initial filter interface is
|
||||
trivial: a filter function receives a chunk of input data,
|
||||
and returns a chunk of processed data. When there are no
|
||||
more input data left, the caller notifies the filter by invoking
|
||||
it with a \nil\ chunk. The filter responds by returning
|
||||
the final chunk of processed data (which could of course be
|
||||
the empty string).
|
||||
|
||||
Although the interface is extremely simple, the
|
||||
implementation is not so obvious. A normalization filter
|
||||
respecting this interface needs to keep some kind of context
|
||||
between calls. This is because a chunk boundary may lie between
|
||||
the \CR\ and \LF\ characters marking the end of a single line. This
|
||||
need for contextual storage motivates the use of
|
||||
factories: each time the factory is invoked, it returns a
|
||||
filter with its own context so that we can have several
|
||||
independent filters being used at the same time. For
|
||||
efficiency reasons, we must avoid the obvious solution of
|
||||
concatenating all the input into the context before
|
||||
producing any output chunks.
|
||||
|
||||
To that end, we break the implementation into two parts:
|
||||
a low-level filter, and a factory of high-level filters. The
|
||||
low-level filter is implemented in C and does not maintain
|
||||
any context between function calls. The high-level filter
|
||||
factory, implemented in Lua, creates and returns a
|
||||
high-level filter that maintains whatever context the low-level
|
||||
filter needs, but isolates the user from its internal
|
||||
details. That way, we take advantage of C's efficiency to
|
||||
perform the hard work, and take advantage of Lua's
|
||||
simplicity for the bookkeeping.
|
||||
|
||||
\subsection{The Lua part of the filter}
|
||||
|
||||
Below is the complete implementation of the factory of high-level
|
||||
end-of-line normalization filters:
|
||||
\begin{quote}
|
||||
\begin{lua}
|
||||
@stick#
|
||||
function filter.cycle(lowlevel, context, extra)
|
||||
return function(chunk)
|
||||
local ret
|
||||
ret, context = lowlevel(context, chunk, extra)
|
||||
return ret
|
||||
end
|
||||
end
|
||||
%
|
||||
|
||||
@stick#
|
||||
function normalize(marker)
|
||||
return filter.cycle(eol, 0, marker)
|
||||
end
|
||||
%
|
||||
\end{lua}
|
||||
\end{quote}
|
||||
|
||||
The \texttt{normalize} factory simply calls a more generic
|
||||
factory, the \texttt{cycle}~factory, passing the low-level
|
||||
filter~\texttt{eol}. The \texttt{cycle}~factory receives a
|
||||
low-level filter, an initial context, and an extra
|
||||
parameter, and returns a new high-level filter. Each time
|
||||
the high-level filer is passed a new chunk, it invokes the
|
||||
low-level filter with the previous context, the new chunk,
|
||||
and the extra argument. It is the low-level filter that
|
||||
does all the work, producing the chunk of processed data and
|
||||
a new context. The high-level filter then replaces its
|
||||
internal context, and returns the processed chunk of data to
|
||||
the user. Notice that we take advantage of Lua's lexical
|
||||
scoping to store the context in a closure between function
|
||||
calls.
|
||||
|
||||
\subsection{The C part of the filter}
|
||||
|
||||
As for the low-level filter, we must first accept
|
||||
that there is no perfect solution to the end-of-line marker
|
||||
normalization problem. The difficulty comes from an
|
||||
inherent ambiguity in the definition of empty lines within
|
||||
mixed input. However, the following solution works well for
|
||||
any consistent input, as well as for non-empty lines in
|
||||
mixed input. It also does a reasonable job with empty lines
|
||||
and serves as a good example of how to implement a low-level
|
||||
filter.
|
||||
|
||||
The idea is to consider both \CR\ and~\LF\ as end-of-line
|
||||
\emph{candidates}. We issue a single break if any candidate
|
||||
is seen alone, or if it is followed by a different
|
||||
candidate. In other words, \CR~\CR~and \LF~\LF\ each issue
|
||||
two end-of-line markers, whereas \CR~\LF~and \LF~\CR\ issue
|
||||
only one marker each. It is easy to see that this method
|
||||
correctly handles the most common end-of-line conventions.
|
||||
|
||||
With this in mind, we divide the low-level filter into two
|
||||
simple functions. The inner function~\texttt{pushchar} performs the
|
||||
normalization itself. It takes each input character in turn,
|
||||
deciding what to output and how to modify the context. The
|
||||
context tells if the last processed character was an
|
||||
end-of-line candidate, and if so, which candidate it was.
|
||||
For efficiency, we use Lua's auxiliary library's buffer
|
||||
interface:
|
||||
\begin{quote}
|
||||
\begin{C}
|
||||
@stick#
|
||||
@#define candidate(c) (c == CR || c == LF)
|
||||
static int pushchar(int c, int last, const char *marker,
|
||||
luaL_Buffer *buffer) {
|
||||
if (candidate(c)) {
|
||||
if (candidate(last)) {
|
||||
if (c == last)
|
||||
luaL_addstring(buffer, marker);
|
||||
return 0;
|
||||
} else {
|
||||
luaL_addstring(buffer, marker);
|
||||
return c;
|
||||
}
|
||||
} else {
|
||||
luaL_pushchar(buffer, c);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
%
|
||||
\end{C}
|
||||
\end{quote}
|
||||
|
||||
The outer function~\texttt{eol} simply interfaces with Lua.
|
||||
It receives the context and input chunk (as well as an
|
||||
optional custom end-of-line marker), and returns the
|
||||
transformed output chunk and the new context.
|
||||
Notice that if the input chunk is \nil, the operation
|
||||
is considered to be finished. In that case, the loop will
|
||||
not execute a single time and the context is reset to the
|
||||
initial state. This allows the filter to be reused many
|
||||
times:
|
||||
\begin{quote}
|
||||
\begin{C}
|
||||
@stick#
|
||||
static int eol(lua_State *L) {
|
||||
int context = luaL_checkint(L, 1);
|
||||
size_t isize = 0;
|
||||
const char *input = luaL_optlstring(L, 2, NULL, &isize);
|
||||
const char *last = input + isize;
|
||||
const char *marker = luaL_optstring(L, 3, CRLF);
|
||||
luaL_Buffer buffer;
|
||||
luaL_buffinit(L, &buffer);
|
||||
if (!input) {
|
||||
lua_pushnil(L);
|
||||
lua_pushnumber(L, 0);
|
||||
return 2;
|
||||
}
|
||||
while (input < last)
|
||||
context = pushchar(*input++, context, marker, &buffer);
|
||||
luaL_pushresult(&buffer);
|
||||
lua_pushnumber(L, context);
|
||||
return 2;
|
||||
}
|
||||
%
|
||||
\end{C}
|
||||
\end{quote}
|
||||
|
||||
When designing filters, the challenging part is usually
|
||||
deciding what to store in the context. For line breaking, for
|
||||
instance, it could be the number of bytes that still fit in the
|
||||
current line. For Base64 encoding, it could be a string
|
||||
with the bytes that remain after the division of the input
|
||||
into 3-byte atoms. The MIME module in the \texttt{LuaSocket}
|
||||
distribution has many other examples.
|
||||
|
||||
\section{Filter chains}
|
||||
|
||||
Chains greatly increase the power of filters. For example,
|
||||
according to the standard for Quoted-Printable encoding,
|
||||
text should be normalized to a canonic end-of-line marker
|
||||
prior to encoding. After encoding, the resulting text must
|
||||
be broken into lines of no more than 76 characters, with the
|
||||
use of soft line breaks (a line terminated by the \texttt{=}
|
||||
sign). To help specifying complex transformations like
|
||||
this, we define a chain factory that creates a composite
|
||||
filter from one or more filters. A chained filter passes
|
||||
data through all its components, and can be used wherever a
|
||||
primitive filter is accepted.
|
||||
|
||||
The chaining factory is very simple. The auxiliary
|
||||
function~\texttt{chainpair} chains two filters together,
|
||||
taking special care if the chunk is the last. This is
|
||||
because the final \nil\ chunk notification has to be
|
||||
pushed through both filters in turn:
|
||||
\begin{quote}
|
||||
\begin{lua}
|
||||
@stick#
|
||||
local function chainpair(f1, f2)
|
||||
return function(chunk)
|
||||
local ret = f2(f1(chunk))
|
||||
if chunk then return ret
|
||||
else return ret .. f2() end
|
||||
end
|
||||
end
|
||||
%
|
||||
|
||||
@stick#
|
||||
function filter.chain(...)
|
||||
local f = select(1, ...)
|
||||
for i = 2, select('@#', ...) do
|
||||
f = chainpair(f, select(i, ...))
|
||||
end
|
||||
return f
|
||||
end
|
||||
%
|
||||
\end{lua}
|
||||
\end{quote}
|
||||
|
||||
Thanks to the chain factory, we can
|
||||
define the Quoted-Printable conversion as such:
|
||||
\begin{quote}
|
||||
\begin{lua}
|
||||
@stick#
|
||||
local qp = filter.chain(normalize(CRLF), encode("quoted-printable"),
|
||||
wrap("quoted-printable"))
|
||||
local input = source.chain(source.file(io.stdin), qp)
|
||||
local output = sink.file(io.stdout)
|
||||
pump.all(input, output)
|
||||
%
|
||||
\end{lua}
|
||||
\end{quote}
|
||||
|
||||
\section{Sources, sinks, and pumps}
|
||||
|
||||
The filters we introduced so far act as the internal nodes
|
||||
in a network of transformations. Information flows from node
|
||||
to node (or rather from one filter to the next) and is
|
||||
transformed along the way. Chaining filters together is our
|
||||
way to connect nodes in this network. As the starting point
|
||||
for the network, we need a source node that produces the
|
||||
data. In the end of the network, we need a sink node that
|
||||
gives a final destination to the data.
|
||||
|
||||
\subsection{Sources}
|
||||
|
||||
A source returns the next chunk of data each time it is
|
||||
invoked. When there is no more data, it simply returns~\nil.
|
||||
In the event of an error, the source can inform the
|
||||
caller by returning \nil\ followed by the error message.
|
||||
|
||||
Below are two simple source factories. The \texttt{empty} source
|
||||
returns no data, possibly returning an associated error
|
||||
message. The \texttt{file} source yields the contents of a file
|
||||
in a chunk by chunk fashion:
|
||||
\begin{quote}
|
||||
\begin{lua}
|
||||
@stick#
|
||||
function source.empty(err)
|
||||
return function()
|
||||
return nil, err
|
||||
end
|
||||
end
|
||||
%
|
||||
|
||||
@stick#
|
||||
function source.file(handle, io_err)
|
||||
if handle then
|
||||
return function()
|
||||
local chunk = handle:read(2048)
|
||||
if not chunk then handle:close() end
|
||||
return chunk
|
||||
end
|
||||
else return source.empty(io_err or "unable to open file") end
|
||||
end
|
||||
%
|
||||
\end{lua}
|
||||
\end{quote}
|
||||
|
||||
\subsection{Filtered sources}
|
||||
|
||||
A filtered source passes its data through the
|
||||
associated filter before returning it to the caller.
|
||||
Filtered sources are useful when working with
|
||||
functions that get their input data from a source (such as
|
||||
the pumps in our examples). By chaining a source with one or
|
||||
more filters, such functions can be transparently provided
|
||||
with filtered data, with no need to change their interfaces.
|
||||
Here is a factory that does the job:
|
||||
\begin{quote}
|
||||
\begin{lua}
|
||||
@stick#
|
||||
function source.chain(src, f)
|
||||
return function()
|
||||
if not src then
|
||||
return nil
|
||||
end
|
||||
local chunk, err = src()
|
||||
if not chunk then
|
||||
src = nil
|
||||
return f(nil)
|
||||
else
|
||||
return f(chunk)
|
||||
end
|
||||
end
|
||||
end
|
||||
%
|
||||
\end{lua}
|
||||
\end{quote}
|
||||
|
||||
\subsection{Sinks}
|
||||
|
||||
Just as we defined an interface for a source of data, we can
|
||||
also define an interface for a data destination. We call
|
||||
any function respecting this interface a sink. In our first
|
||||
example, we used a file sink connected to the standard
|
||||
output.
|
||||
|
||||
Sinks receive consecutive chunks of data, until the end of
|
||||
data is signaled by a \nil\ input chunk. A sink can be
|
||||
notified of an error with an optional extra argument that
|
||||
contains the error message, following a \nil\ chunk.
|
||||
If a sink detects an error itself, and
|
||||
wishes not to be called again, it can return \nil,
|
||||
followed by an error message. A return value that
|
||||
is not \nil\ means the sink will accept more data.
|
||||
|
||||
Below are two useful sink factories.
|
||||
The table factory creates a sink that stores
|
||||
individual chunks into an array. The data can later be
|
||||
efficiently concatenated into a single string with Lua's
|
||||
\texttt{table.concat} library function. The \texttt{null} sink
|
||||
simply discards the chunks it receives:
|
||||
\begin{quote}
|
||||
\begin{lua}
|
||||
@stick#
|
||||
function sink.table(t)
|
||||
t = t or {}
|
||||
local f = function(chunk, err)
|
||||
if chunk then table.insert(t, chunk) end
|
||||
return 1
|
||||
end
|
||||
return f, t
|
||||
end
|
||||
%
|
||||
|
||||
@stick#
|
||||
local function null()
|
||||
return 1
|
||||
end
|
||||
|
||||
function sink.null()
|
||||
return null
|
||||
end
|
||||
%
|
||||
\end{lua}
|
||||
\end{quote}
|
||||
|
||||
Naturally, filtered sinks are just as useful as filtered
|
||||
sources. A filtered sink passes each chunk it receives
|
||||
through the associated filter before handing it down to the
|
||||
original sink. In the following example, we use a source
|
||||
that reads from the standard input. The input chunks are
|
||||
sent to a table sink, which has been coupled with a
|
||||
normalization filter. The filtered chunks are then
|
||||
concatenated from the output array, and finally sent to
|
||||
standard out:
|
||||
\begin{quote}
|
||||
\begin{lua}
|
||||
@stick#
|
||||
local input = source.file(io.stdin)
|
||||
local output, t = sink.table()
|
||||
output = sink.chain(normalize(CRLF), output)
|
||||
pump.all(input, output)
|
||||
io.write(table.concat(t))
|
||||
%
|
||||
\end{lua}
|
||||
\end{quote}
|
||||
|
||||
\subsection{Pumps}
|
||||
|
||||
Although not on purpose, our interface for sources is
|
||||
compatible with Lua iterators. That is, a source can be
|
||||
neatly used in conjunction with \texttt{for} loops. Using
|
||||
our file source as an iterator, we can write the following
|
||||
code:
|
||||
\begin{quote}
|
||||
\begin{lua}
|
||||
@stick#
|
||||
for chunk in source.file(io.stdin) do
|
||||
io.write(chunk)
|
||||
end
|
||||
%
|
||||
\end{lua}
|
||||
\end{quote}
|
||||
|
||||
Loops like this will always be present because everything
|
||||
we designed so far is passive. Sources, sinks, filters: none
|
||||
of them can do anything on their own. The operation of
|
||||
pumping all data a source can provide into a sink is so
|
||||
common that it deserves its own function:
|
||||
\begin{quote}
|
||||
\begin{lua}
|
||||
@stick#
|
||||
function pump.step(src, snk)
|
||||
local chunk, src_err = src()
|
||||
local ret, snk_err = snk(chunk, src_err)
|
||||
if chunk and ret then return 1
|
||||
else return nil, src_err or snk_err end
|
||||
end
|
||||
%
|
||||
|
||||
@stick#
|
||||
function pump.all(src, snk, step)
|
||||
step = step or pump.step
|
||||
while true do
|
||||
local ret, err = step(src, snk)
|
||||
if not ret then
|
||||
if err then return nil, err
|
||||
else return 1 end
|
||||
end
|
||||
end
|
||||
end
|
||||
%
|
||||
\end{lua}
|
||||
\end{quote}
|
||||
|
||||
The \texttt{pump.step} function moves one chunk of data from
|
||||
the source to the sink. The \texttt{pump.all} function takes
|
||||
an optional \texttt{step} function and uses it to pump all the
|
||||
data from the source to the sink.
|
||||
Here is an example that uses the Base64 and the
|
||||
line wrapping filters from the \texttt{LuaSocket}
|
||||
distribution. The program reads a binary file from
|
||||
disk and stores it in another file, after encoding it to the
|
||||
Base64 transfer content encoding:
|
||||
\begin{quote}
|
||||
\begin{lua}
|
||||
@stick#
|
||||
local input = source.chain(
|
||||
source.file(io.open("input.bin", "rb")),
|
||||
encode("base64"))
|
||||
local output = sink.chain(
|
||||
wrap(76),
|
||||
sink.file(io.open("output.b64", "w")))
|
||||
pump.all(input, output)
|
||||
%
|
||||
\end{lua}
|
||||
\end{quote}
|
||||
|
||||
The way we split the filters here is not intuitive, on
|
||||
purpose. Alternatively, we could have chained the Base64
|
||||
encode filter and the line-wrap filter together, and then
|
||||
chain the resulting filter with either the file source or
|
||||
the file sink. It doesn't really matter.
|
||||
|
||||
\section{Exploding filters}
|
||||
|
||||
Our current filter interface has one serious shortcoming.
|
||||
Consider for example a \texttt{gzip} decompression filter.
|
||||
During decompression, a small input chunk can be exploded
|
||||
into a huge amount of data. To address this problem, we
|
||||
decided to change the filter interface and allow exploding
|
||||
filters to return large quantities of output data in a chunk
|
||||
by chunk manner.
|
||||
|
||||
More specifically, after passing each chunk of input to
|
||||
a filter, and collecting the first chunk of output, the
|
||||
user must now loop to receive other chunks from the filter until no
|
||||
filtered data is left. Within these secondary calls, the
|
||||
caller passes an empty string to the filter. The filter
|
||||
responds with an empty string when it is ready for the next
|
||||
input chunk. In the end, after the user passes a
|
||||
\nil\ chunk notifying the filter that there is no
|
||||
more input data, the filter might still have to produce too
|
||||
much output data to return in a single chunk. The user has
|
||||
to loop again, now passing \nil\ to the filter each time,
|
||||
until the filter itself returns \nil\ to notify the
|
||||
user it is finally done.
|
||||
|
||||
Fortunately, it is very easy to modify a filter to respect
|
||||
the new interface. In fact, the end-of-line translation
|
||||
filter we presented earlier already conforms to it. The
|
||||
complexity is encapsulated within the chaining functions,
|
||||
which must now include a loop. Since these functions only
|
||||
have to be written once, the user is rarely affected.
|
||||
Interestingly, the modifications do not have a measurable
|
||||
negative impact in the performance of filters that do
|
||||
not need the added flexibility. On the other hand, for a
|
||||
small price in complexity, the changes make exploding
|
||||
filters practical.
|
||||
|
||||
\section{A complex example}
|
||||
|
||||
The LTN12 module in the \texttt{LuaSocket} distribution
|
||||
implements all the ideas we have described. The MIME
|
||||
and SMTP modules are tightly integrated with LTN12,
|
||||
and can be used to showcase the expressive power of filters,
|
||||
sources, sinks, and pumps. Below is an example
|
||||
of how a user would proceed to define and send a
|
||||
multipart message, with attachments, using \texttt{LuaSocket}:
|
||||
\begin{quote}
|
||||
\begin{mime}
|
||||
local smtp = require"socket.smtp"
|
||||
local mime = require"mime"
|
||||
local ltn12 = require"ltn12"
|
||||
|
||||
local message = smtp.message{
|
||||
headers = {
|
||||
from = "Sicrano <sicrano@example.com>",
|
||||
to = "Fulano <fulano@example.com>",
|
||||
subject = "A message with an attachment"},
|
||||
body = {
|
||||
preamble = "Hope you can see the attachment" .. CRLF,
|
||||
[1] = {
|
||||
body = "Here is our logo" .. CRLF},
|
||||
[2] = {
|
||||
headers = {
|
||||
["content-type"] = 'image/png; name="luasocket.png"',
|
||||
["content-disposition"] =
|
||||
'attachment; filename="luasocket.png"',
|
||||
["content-description"] = 'LuaSocket logo',
|
||||
["content-transfer-encoding"] = "BASE64"},
|
||||
body = ltn12.source.chain(
|
||||
ltn12.source.file(io.open("luasocket.png", "rb")),
|
||||
ltn12.filter.chain(
|
||||
mime.encode("base64"),
|
||||
mime.wrap()))}}}
|
||||
|
||||
assert(smtp.send{
|
||||
rcpt = "<fulano@example.com>",
|
||||
from = "<sicrano@example.com>",
|
||||
source = message})
|
||||
\end{mime}
|
||||
\end{quote}
|
||||
|
||||
The \texttt{smtp.message} function receives a table
|
||||
describing the message, and returns a source. The
|
||||
\texttt{smtp.send} function takes this source, chains it with the
|
||||
SMTP dot-stuffing filter, connects a socket sink
|
||||
with the server, and simply pumps the data. The message is never
|
||||
assembled in memory. Everything is produced on demand,
|
||||
transformed in small pieces, and sent to the server in chunks,
|
||||
including the file attachment which is loaded from disk and
|
||||
encoded on the fly. It just works.
|
||||
|
||||
\section{Conclusions}
|
||||
|
||||
In this article, we introduced the concepts of filters,
|
||||
sources, sinks, and pumps to the Lua language. These are
|
||||
useful tools for stream processing in general. Sources provide
|
||||
a simple abstraction for data acquisition. Sinks provide an
|
||||
abstraction for final data destinations. Filters define an
|
||||
interface for data transformations. The chaining of
|
||||
filters, sources and sinks provides an elegant way to create
|
||||
arbitrarily complex data transformations from simpler
|
||||
components. Pumps simply push the data through.
|
||||
|
||||
\section{Acknowledgements}
|
||||
|
||||
The concepts described in this text are the result of long
|
||||
discussions with David Burgess. A version of this text has
|
||||
been released on-line as the Lua Technical Note 012, hence
|
||||
the name of the corresponding LuaSocket module, LTN12. Wim
|
||||
Couwenberg contributed to the implementation of the module,
|
||||
and Adrian Sietsma was the first to notice the
|
||||
correspondence between sources and Lua iterators.
|
||||
|
||||
|
||||
\end{document}
|
||||
Binary file not shown.
|
After Width: | Height: | Size: 12 KiB |
|
|
@ -0,0 +1,14 @@
|
|||
ltn012.pdf: ltn012.ps
|
||||
./myps2pdf ltn012.ps
|
||||
|
||||
ltn012.ps: ltn012.dvi
|
||||
dvips -G0 -t letter -o ltn012.ps ltn012.dvi
|
||||
|
||||
ltn012.dvi: ltn012.tex
|
||||
latex ltn012
|
||||
|
||||
clean:
|
||||
rm -f *~ *.log *.aux *.bbl *.blg ltn012.pdf ltn012.ps ltn012.dvi ltn012.lof ltn012.toc ltn012.lot
|
||||
|
||||
pdf: ltn012.pdf
|
||||
open ltn012.pdf
|
||||
|
|
@ -0,0 +1,113 @@
|
|||
#!/bin/sh -
|
||||
do_opt=1
|
||||
best=0
|
||||
rot=0
|
||||
a4=0
|
||||
eps=0
|
||||
usage="Usage: $0 [-no_opt] [-best] [-rot] [-a4] [-eps] in.ps [out.pdf]"
|
||||
|
||||
case "x$1" in
|
||||
"x-no_opt") do_opt=0 ; shift ;;
|
||||
esac
|
||||
|
||||
case "x$1" in
|
||||
"x-best") best=1 ; shift ;;
|
||||
esac
|
||||
|
||||
case "x$1" in
|
||||
"x-rot") rot=1 ; shift ;;
|
||||
esac
|
||||
|
||||
case "x$1" in
|
||||
"x-a4") a4=1 ; shift ;;
|
||||
esac
|
||||
|
||||
case "x$1" in
|
||||
"x-eps") eps=1 ; shift ;;
|
||||
esac
|
||||
|
||||
case $# in
|
||||
2) ifilename=$1 ; ofilename=$2 ;;
|
||||
1) ifilename=$1
|
||||
if `echo $1 | grep -i '\.e*ps$' > /dev/null`
|
||||
then
|
||||
ofilename=`echo $1 | sed 's/\..*$/.pdf/'`
|
||||
else
|
||||
echo "$usage" 1>&2
|
||||
exit 1
|
||||
fi ;;
|
||||
*) echo "$usage" 1>&2 ; exit 1 ;;
|
||||
esac
|
||||
|
||||
if [ $best == 1 ]
|
||||
then
|
||||
options="-dPDFSETTINGS=/prepress \
|
||||
-r1200 \
|
||||
-dMonoImageResolution=1200 \
|
||||
-dGrayImageResolution=1200 \
|
||||
-dColorImageResolution=1200 \
|
||||
-dDownsampleMonoImages=false \
|
||||
-dDownsampleGrayImages=false \
|
||||
-dDownsampleColorImages=false \
|
||||
-dAutoFilterMonoImages=false \
|
||||
-dAutoFilterGrayImages=false \
|
||||
-dAutoFilterColorImages=false \
|
||||
-dMonoImageFilter=/FlateEncode \
|
||||
-dGrayImageFilter=/FlateEncode \
|
||||
-dColorImageFilter=/FlateEncode"
|
||||
else
|
||||
options="-dPDFSETTINGS=/prepress \
|
||||
-r600 \
|
||||
-dDownsampleMonoImages=true \
|
||||
-dDownsampleGrayImages=true \
|
||||
-dDownsampleColorImages=true \
|
||||
-dMonoImageDownsampleThreshold=2.0 \
|
||||
-dGrayImageDownsampleThreshold=1.5 \
|
||||
-dColorImageDownsampleThreshold=1.5 \
|
||||
-dMonoImageResolution=600 \
|
||||
-dGrayImageResolution=600 \
|
||||
-dColorImageResolution=600 \
|
||||
-dAutoFilterMonoImages=false \
|
||||
-dMonoImageFilter=/FlateEncode \
|
||||
-dAutoFilterGrayImages=true \
|
||||
-dAutoFilterColorImages=true"
|
||||
fi
|
||||
|
||||
if [ $rot == 1 ]
|
||||
then
|
||||
options="$options -dAutoRotatePages=/PageByPage"
|
||||
fi
|
||||
|
||||
if [ $eps == 1 ]
|
||||
then
|
||||
options="$options -dEPSCrop"
|
||||
fi
|
||||
|
||||
set -x
|
||||
|
||||
if [ $a4 == 1 ]
|
||||
then
|
||||
# Resize from A4 to letter size
|
||||
psresize -Pa4 -pletter "$ifilename" myps2pdf.temp.ps
|
||||
ifilename=myps2pdf.temp.ps
|
||||
fi
|
||||
|
||||
gs -q -dSAFER -dNOPAUSE -dBATCH \
|
||||
-sDEVICE=pdfwrite -sPAPERSIZE=letter -sOutputFile=myps2pdf.temp.pdf \
|
||||
-dCompatibilityLevel=1.3 \
|
||||
$options \
|
||||
-dMaxSubsetPct=100 \
|
||||
-dSubsetFonts=true \
|
||||
-dEmbedAllFonts=true \
|
||||
-dColorConversionStrategy=/LeaveColorUnchanged \
|
||||
-dDoThumbnails=true \
|
||||
-dPreserveEPSInfo=true \
|
||||
-c .setpdfwrite -f "$ifilename"
|
||||
|
||||
if [ $do_opt == 1 ]
|
||||
then
|
||||
pdfopt myps2pdf.temp.pdf $ofilename
|
||||
else
|
||||
mv myps2pdf.temp.pdf $ofilename
|
||||
fi
|
||||
rm -f myps2pdf.temp.pdf myps2pdf.temp.ps
|
||||
|
|
@ -0,0 +1,25 @@
|
|||
source = {}
|
||||
sink = {}
|
||||
pump = {}
|
||||
filter = {}
|
||||
|
||||
-- source.chain
|
||||
dofile("ex6.lua")
|
||||
|
||||
-- source.file
|
||||
dofile("ex5.lua")
|
||||
|
||||
-- normalize
|
||||
require"gem"
|
||||
eol = gem.eol
|
||||
dofile("ex2.lua")
|
||||
|
||||
-- sink.file
|
||||
require"ltn12"
|
||||
sink.file = ltn12.sink.file
|
||||
|
||||
-- pump.all
|
||||
dofile("ex10.lua")
|
||||
|
||||
-- run test
|
||||
dofile("ex1.lua")
|
||||
|
|
@ -0,0 +1,5 @@
|
|||
this is a test file
|
||||
it should have been saved as lf eol
|
||||
but t1.lua will convert it to crlf eol
|
||||
otherwise it is broken!
|
||||
|
||||
|
|
@ -0,0 +1,36 @@
|
|||
source = {}
|
||||
sink = {}
|
||||
pump = {}
|
||||
filter = {}
|
||||
|
||||
-- filter.chain
|
||||
dofile("ex3.lua")
|
||||
|
||||
-- normalize
|
||||
require"gem"
|
||||
eol = gem.eol
|
||||
dofile("ex2.lua")
|
||||
|
||||
-- encode
|
||||
require"mime"
|
||||
encode = mime.encode
|
||||
|
||||
-- wrap
|
||||
wrap = mime.wrap
|
||||
|
||||
-- source.chain
|
||||
dofile("ex6.lua")
|
||||
|
||||
-- source.file
|
||||
dofile("ex5.lua")
|
||||
|
||||
-- sink.file
|
||||
require"ltn12"
|
||||
sink.file = ltn12.sink.file
|
||||
|
||||
-- pump.all
|
||||
dofile("ex10.lua")
|
||||
|
||||
-- run test
|
||||
CRLF = "\013\010"
|
||||
dofile("ex4.lua")
|
||||
|
|
@ -0,0 +1,4 @@
|
|||
esse é um texto com acentos
|
||||
quoted-printable tem que quebrar linhas longas, com mais que 76 linhas de texto
|
||||
fora que as quebras de linhas têm que ser normalizadas
|
||||
vamos ver o que dá isso aqui
|
||||
|
|
@ -0,0 +1,5 @@
|
|||
esse =E9 um texto com acentos
|
||||
quoted-printable tem que quebrar linhas longas, com mais que 76 linhas de t=
|
||||
exto
|
||||
fora que as quebras de linhas t=EAm que ser normalizadas
|
||||
vamos ver o que d=E1 isso aqui
|
||||
|
|
@ -0,0 +1,25 @@
|
|||
source = {}
|
||||
sink = {}
|
||||
pump = {}
|
||||
filter = {}
|
||||
|
||||
-- source.file
|
||||
dofile("ex5.lua")
|
||||
|
||||
-- sink.table
|
||||
dofile("ex7.lua")
|
||||
|
||||
-- sink.chain
|
||||
require"ltn12"
|
||||
sink.chain = ltn12.sink.chain
|
||||
|
||||
-- normalize
|
||||
require"gem"
|
||||
eol = gem.eol
|
||||
dofile("ex2.lua")
|
||||
|
||||
-- pump.all
|
||||
dofile("ex10.lua")
|
||||
|
||||
-- run test
|
||||
dofile("ex8.lua")
|
||||
|
|
@ -0,0 +1,10 @@
|
|||
source = {}
|
||||
sink = {}
|
||||
pump = {}
|
||||
filter = {}
|
||||
|
||||
-- source.file
|
||||
dofile("ex5.lua")
|
||||
|
||||
-- run test
|
||||
dofile("ex9.lua")
|
||||
|
|
@ -0,0 +1,30 @@
|
|||
source = {}
|
||||
sink = {}
|
||||
pump = {}
|
||||
filter = {}
|
||||
|
||||
-- source.chain
|
||||
dofile("ex6.lua")
|
||||
|
||||
-- source.file
|
||||
dofile("ex5.lua")
|
||||
|
||||
-- encode
|
||||
require"mime"
|
||||
encode = mime.encode
|
||||
|
||||
-- sink.chain
|
||||
require"ltn12"
|
||||
sink.chain = ltn12.sink.chain
|
||||
|
||||
-- wrap
|
||||
wrap = mime.wrap
|
||||
|
||||
-- sink.file
|
||||
sink.file = ltn12.sink.file
|
||||
|
||||
-- pump.all
|
||||
dofile("ex10.lua")
|
||||
|
||||
-- run test
|
||||
dofile("ex11.lua")
|
||||
|
|
@ -0,0 +1,46 @@
|
|||
function readfile(n)
|
||||
local f = io.open(n, "rb")
|
||||
local s = f:read("*a")
|
||||
f:close()
|
||||
return s
|
||||
end
|
||||
|
||||
lf = readfile("t1lf.txt")
|
||||
os.remove("t1crlf.txt")
|
||||
os.execute("lua t1.lua < t1lf.txt > t1crlf.txt")
|
||||
crlf = readfile("t1crlf.txt")
|
||||
assert(crlf == string.gsub(lf, "\010", "\013\010"), "broken")
|
||||
|
||||
gt = readfile("t2gt.qp")
|
||||
os.remove("t2.qp")
|
||||
os.execute("lua t2.lua < t2.txt > t2.qp")
|
||||
t2 = readfile("t2.qp")
|
||||
assert(gt == t2, "broken")
|
||||
|
||||
os.remove("t1crlf.txt")
|
||||
os.execute("lua t3.lua < t1lf.txt > t1crlf.txt")
|
||||
crlf = readfile("t1crlf.txt")
|
||||
assert(crlf == string.gsub(lf, "\010", "\013\010"), "broken")
|
||||
|
||||
t = readfile("test.lua")
|
||||
os.execute("lua t4.lua < test.lua > t")
|
||||
t2 = readfile("t")
|
||||
assert(t == t2, "broken")
|
||||
|
||||
os.remove("output.b64")
|
||||
gt = readfile("gt.b64")
|
||||
os.execute("lua t5.lua")
|
||||
t5 = readfile("output.b64")
|
||||
assert(gt == t5, "failed")
|
||||
|
||||
print("1 2 5 6 10 passed")
|
||||
print("2 3 4 5 6 10 passed")
|
||||
print("2 5 6 7 8 10 passed")
|
||||
print("5 9 passed")
|
||||
print("5 6 10 11 passed")
|
||||
|
||||
os.remove("t")
|
||||
os.remove("t2.qp")
|
||||
os.remove("t1crlf.txt")
|
||||
os.remove("t11.b64")
|
||||
os.remove("output.b64")
|
||||
|
|
@ -0,0 +1 @@
|
|||
make PLAT=linux DEBUG=DEBUG LUAINC_linux_base=/home/diego/build/ubuntu/include LUAPREFIX_linux=/home/diego/build/ubuntu
|
||||
|
|
@ -0,0 +1,210 @@
|
|||
%!PS-Adobe-2.0 EPSF-2.0
|
||||
%%Title: Lua logo
|
||||
%%Creator: lua@tecgraf.puc-rio.br
|
||||
%%CreationDate: Wed Nov 29 19:04:04 EDT 2000
|
||||
%%BoundingBox: -45 0 1035 1080
|
||||
%%Pages: 1
|
||||
%%EndComments
|
||||
%%EndProlog
|
||||
|
||||
%------------------------------------------------------------------------------
|
||||
%
|
||||
% Copyright (C) 1998-2000. All rights reserved.
|
||||
% Graphic design by Alexandre Nakonechny (nako@openlink.com.br).
|
||||
% PostScript programming by the Lua team (lua@tecgraf.puc-rio.br).
|
||||
%
|
||||
% Permission is hereby granted, without written agreement and without license
|
||||
% or royalty fees, to use, copy, and distribute this logo for any purpose,
|
||||
% including commercial applications, subject to the following conditions:
|
||||
%
|
||||
% * The origin of this logo must not be misrepresented; you must not
|
||||
% claim that you drew the original logo. We recommend that you give credit
|
||||
% to the graphics designer in all printed matter that includes the logo.
|
||||
%
|
||||
% * The only modification you can make is to adapt the orbiting text to
|
||||
% your product name.
|
||||
%
|
||||
% * The logo can be used in any scale as long as the relative proportions
|
||||
% of its elements are maintained.
|
||||
%
|
||||
%------------------------------------------------------------------------------
|
||||
|
||||
/LABEL (tekcoS) def
|
||||
|
||||
%-- DO NOT CHANGE ANYTHING BELOW THIS LINE ------------------------------------
|
||||
|
||||
/PLANETCOLOR {0 0 0.5 setrgbcolor} bind def
|
||||
/HOLECOLOR {1.0 setgray} bind def
|
||||
/ORBITCOLOR {0.5 setgray} bind def
|
||||
/LOGOFONT {/Helvetica 0.90} def
|
||||
/LABELFONT {/Helvetica 0.36} def
|
||||
|
||||
%------------------------------------------------------------------------------
|
||||
|
||||
/MOONCOLOR {PLANETCOLOR} bind def
|
||||
/LOGOCOLOR {HOLECOLOR} bind def
|
||||
/LABELCOLOR {ORBITCOLOR} bind def
|
||||
|
||||
/LABELANGLE 325 def
|
||||
/LOGO (Lua) def
|
||||
|
||||
/DASHANGLE 10 def
|
||||
/HALFDASHANGLE DASHANGLE 2 div def
|
||||
|
||||
% moon radius. planet radius is 1.
|
||||
/r 1 2 sqrt 2 div sub def
|
||||
|
||||
/D {0 360 arc fill} bind def
|
||||
/F {exch findfont exch scalefont setfont} bind def
|
||||
|
||||
% place it nicely on the paper
|
||||
/RESOLUTION 1024 def
|
||||
RESOLUTION 2 div dup translate
|
||||
RESOLUTION 2 div 2 sqrt div dup scale
|
||||
|
||||
%-------------------------------------------------------------------- planet --
|
||||
PLANETCOLOR
|
||||
0 0 1 D
|
||||
|
||||
%---------------------------------------------------------------------- hole --
|
||||
HOLECOLOR
|
||||
1 2 r mul sub dup r D
|
||||
|
||||
%---------------------------------------------------------------------- moon --
|
||||
MOONCOLOR
|
||||
1 1 r D
|
||||
|
||||
%---------------------------------------------------------------------- logo --
|
||||
LOGOCOLOR
|
||||
LOGOFONT
|
||||
F
|
||||
LOGO stringwidth pop 2 div neg
|
||||
-0.5 moveto
|
||||
LOGO show
|
||||
|
||||
%------------------------------------------------------------------------------
|
||||
% based on code from Blue Book Program 10, on pages 167--169
|
||||
% available at ftp://ftp.adobe.com/pub/adobe/displaypostscript/bluebook.shar
|
||||
|
||||
% str ptsize centerangle radius outsidecircletext --
|
||||
/outsidecircletext {
|
||||
circtextdict begin
|
||||
/radius exch def
|
||||
/centerangle exch def
|
||||
/ptsize exch def
|
||||
/str exch def
|
||||
|
||||
gsave
|
||||
str radius ptsize findhalfangle
|
||||
centerangle
|
||||
add rotate
|
||||
str
|
||||
{ /charcode exch def
|
||||
( ) dup 0 charcode put outsideplacechar
|
||||
} forall
|
||||
|
||||
grestore
|
||||
end
|
||||
} def
|
||||
|
||||
% string radius ptsize findhalfangle halfangle
|
||||
/findhalfangle {
|
||||
4 div add
|
||||
exch
|
||||
stringwidth pop 2 div
|
||||
exch
|
||||
2 mul 3.1415926535 mul div 360 mul
|
||||
} def
|
||||
|
||||
/circtextdict 16 dict def
|
||||
circtextdict begin
|
||||
|
||||
/outsideplacechar {
|
||||
/char exch def
|
||||
/halfangle char radius ptsize findhalfangle def
|
||||
gsave
|
||||
halfangle neg rotate
|
||||
1.4 0 translate
|
||||
90 rotate
|
||||
char stringwidth pop 2 div neg 0 moveto
|
||||
char show
|
||||
grestore
|
||||
halfangle 2 mul neg rotate
|
||||
} def
|
||||
|
||||
end
|
||||
|
||||
%--------------------------------------------------------------------- label --
|
||||
LABELFONT
|
||||
F
|
||||
|
||||
/LABELSIZE LABELFONT exch pop def
|
||||
/LABELRADIUS LABELSIZE 3 div 1 r add sub neg 1.02 mul def
|
||||
|
||||
|
||||
/HALFANGLE
|
||||
LABEL LABELRADIUS LABELSIZE findhalfangle
|
||||
HALFDASHANGLE div ceiling HALFDASHANGLE mul
|
||||
def
|
||||
|
||||
/LABELANGLE
|
||||
60 LABELANGLE HALFANGLE sub
|
||||
lt
|
||||
{
|
||||
HALFANGLE
|
||||
HALFANGLE DASHANGLE div floor DASHANGLE mul
|
||||
eq
|
||||
{LABELANGLE DASHANGLE div ceiling DASHANGLE mul}
|
||||
{LABELANGLE HALFDASHANGLE sub DASHANGLE div round DASHANGLE mul HALFDASHANGLE add}
|
||||
ifelse
|
||||
}
|
||||
{HALFANGLE 60 add}
|
||||
ifelse
|
||||
def
|
||||
|
||||
LABELCOLOR
|
||||
LABEL
|
||||
LABELSIZE
|
||||
LABELANGLE
|
||||
LABELRADIUS
|
||||
outsidecircletext
|
||||
|
||||
%--------------------------------------------------------------------- orbit --
|
||||
ORBITCOLOR
|
||||
0.03 setlinewidth
|
||||
[1 r add 3.1415926535 180 div HALFDASHANGLE mul mul] 0 setdash
|
||||
newpath
|
||||
0 0
|
||||
1 r add
|
||||
3 copy
|
||||
30
|
||||
LABELANGLE HALFANGLE add
|
||||
arcn
|
||||
stroke
|
||||
60
|
||||
LABELANGLE HALFANGLE sub
|
||||
2 copy
|
||||
lt {arc stroke} {4 {pop} repeat} ifelse
|
||||
|
||||
%------------------------------------------------------------------ copyright --
|
||||
/COPYRIGHT
|
||||
(Graphic design by A. Nakonechny. Copyright (c) 1998, All rights reserved.)
|
||||
def
|
||||
|
||||
LABELCOLOR
|
||||
LOGOFONT
|
||||
32 div
|
||||
F
|
||||
2 sqrt 0.99 mul
|
||||
dup
|
||||
neg
|
||||
moveto
|
||||
COPYRIGHT
|
||||
90 rotate
|
||||
%show
|
||||
|
||||
%---------------------------------------------------------------------- done --
|
||||
showpage
|
||||
|
||||
%%Trailer
|
||||
%%EOF
|
||||
|
|
@ -0,0 +1,393 @@
|
|||
===Filters, sources and sinks: design, motivation and examples===
|
||||
==or Functional programming for the rest of us==
|
||||
by DiegoNehab
|
||||
|
||||
{{{
|
||||
|
||||
}}}
|
||||
|
||||
===Abstract===
|
||||
Certain operations can be implemented in the form of filters. A filter is a function that processes data received in consecutive function calls, returning partial results chunk by chunk. Examples of operations that can be implemented as filters include the end-of-line normalization for text, Base64 and Quoted-Printable transfer content encodings, the breaking of text into lines, SMTP byte stuffing, and there are many others. Filters become even more powerful when we allow them to be chained together to create composite filters. Filters can be seen as middle nodes in a chain of data transformations. Sources an sinks are the corresponding end points of these chains. A source is a function that produces data, chunk by chunk, and a sink is a function that takes data, chunk by chunk. In this technical note, we define an elegant interface for filters, sources, sinks and chaining. We evolve our interface progressively, until we reach a high degree of generality. We discuss difficulties that arise during the implementation of this interface and we provide solutions and examples.
|
||||
|
||||
===Introduction===
|
||||
|
||||
Applications sometimes have too much information to process to fit in memory and are thus forced to process data in smaller parts. Even when there is enough memory, processing all the data atomically may take long enough to frustrate a user that wants to interact with the application. Furthermore, complex transformations can often be defined as series of simpler operations. Several different complex transformations might share the same simpler operations, so that an uniform interface to combine them is desirable. The following concepts constitute our solution to these problems.
|
||||
|
||||
''Filters'' are functions that accept successive chunks of input, and produce successive chunks of output. Furthermore, the result of concatenating all the output data is the same as the result of applying the filter over the concatenation of the input data. As a consequence, boundaries are irrelevant: filters have to handle input data split arbitrarily by the user.
|
||||
|
||||
A ''chain'' is a function that combines the effect of two (or more) other functions, but whose interface is indistinguishable from the interface of one of its components. Thus, a chained filter can be used wherever an atomic filter can be used. However, its effect on data is the combined effect of its component filters. Note that, as a consequence, chains can be chained themselves to create arbitrarily complex operations that can be used just like atomic operations.
|
||||
|
||||
Filters can be seen as internal nodes in a network through which data flows, potentially being transformed along its way. Chains connect these nodes together. To complete the picture, we need ''sources'' and ''sinks'' as initial and final nodes of the network, respectively. Less abstractly, a source is a function that produces new data every time it is called. On the other hand, sinks are functions that give a final destination to the data they receive. Naturally, sources and sinks can be chained with filters.
|
||||
|
||||
Finally, filters, chains, sources, and sinks are all passive entities: they need to be repeatedly called in order for something to happen. ''Pumps'' provide the driving force that pushes data through the network, from a source to a sink.
|
||||
|
||||
Hopefully, these concepts will become clear with examples. In the following sections, we start with simplified interfaces, which we improve several times until we can find no obvious shortcomings. The evolution we present is not contrived: it follows the steps we followed ourselves as we consolidated our understanding of these concepts.
|
||||
|
||||
== A concrete example ==
|
||||
|
||||
Some data transformations are easier to implement as filters than others. Examples of operations that can be implemented as filters include the end-of-line normalization for text, the Base64 and Quoted-Printable transfer content encodings, the breaking of text into lines, SMTP byte stuffing, and many others. Let's use the end-of-line normalization as an example to define our initial filter interface. We later discuss why the implementation might not be trivial.
|
||||
|
||||
Assume we are given text in an unknown end-of-line convention (including possibly mixed conventions) out of the commonly found Unix (LF), Mac OS (CR), and DOS (CRLF) conventions. We would like to be able to write code like the following:
|
||||
{{{
|
||||
input = source.chain(source.file(io.stdin), normalize("\r\n"))
|
||||
output = sink.file(io.stdout)
|
||||
pump(input, output)
|
||||
}}}
|
||||
|
||||
This program should read data from the standard input stream and normalize the end-of-line markers to the canonic CRLF marker defined by the MIME standard, finally sending the results to the standard output stream. For that, we use a ''file source'' to produce data from standard input, and chain it with a filter that normalizes the data. The pump then repeatedly gets data from the source, and moves it to the ''file sink'' that sends it to standard output.
|
||||
|
||||
To make the discussion even more concrete, we start by discussing the implementation of the normalization filter. The {{normalize}} ''factory'' is a function that creates such a filter. Our initial filter interface is as follows: the filter receives a chunk of input data, and returns a chunk of processed data. When there is no more input data, the user notifies the filter by invoking it with a {{nil}} chunk. The filter then returns the final chunk of processed data.
|
||||
|
||||
Although the interface is extremely simple, the implementation doesn't seem so obvious. Any filter respecting this interface needs to keep some kind of context between calls. This is because chunks can be broken between the CR and LF characters marking the end of a line. This need for context storage is what motivates the use of factories: each time the factory is called, it returns a filter with its own context so that we can have several independent filters being used at the same time. For the normalization filter, we know that the obvious solution (i.e. concatenating all the input into the context before producing any output) is not good enough, so we will have to find another way.
|
||||
|
||||
We will break the implementation in two parts: a low-level filter, and a factory of high-level filters. The low-level filter will be implemented in C and will not carry any context between function calls. The high-level filter factory, implemented in Lua, will create and return a high-level filter that keeps whatever context the low-level filter needs, but isolates the user from its internal details. That way, we take advantage of C's efficiency to perform the dirty work, and take advantage of Lua's simplicity for the bookkeeping.
|
||||
|
||||
==The Lua part of the implementation==
|
||||
|
||||
Below is the implementation of the factory of high-level end-of-line normalization filters:
|
||||
{{{
|
||||
function filter.cycle(low, ctx, extra)
|
||||
return function(chunk)
|
||||
local ret
|
||||
ret, ctx = low(ctx, chunk, extra)
|
||||
return ret
|
||||
end
|
||||
end
|
||||
|
||||
function normalize(marker)
|
||||
return cycle(eol, 0, marker)
|
||||
end
|
||||
}}}
|
||||
|
||||
The {{normalize}} factory simply calls a more generic factory, the {{cycle}} factory. This factory receives a low-level filter, an initial context and some extra value and returns the corresponding high-level filter. Each time the high level filer is called with a new chunk, it calls the low-level filter passing the previous context, the new chunk and the extra argument. The low-level filter produces the chunk of processed data and a new context. Finally, the high-level filter updates its internal context and returns the processed chunk of data to the user. It is the low-level filter that does all the work. Notice that this implementation takes advantage of the Lua 5.0 lexical scoping rules to store the context locally, between function calls.
|
||||
|
||||
Moving to the low-level filter, we notice there is no perfect solution to the end-of-line marker normalization problem itself. The difficulty comes from an inherent ambiguity on the definition of empty lines within mixed input. However, the following solution works well for any consistent input, as well as for non-empty lines in mixed input. It also does a reasonable job with empty lines and serves as a good example of how to implement a low-level filter.
|
||||
|
||||
Here is what we do: CR and LF are considered candidates for line break. We issue ''one'' end-of-line line marker if one of the candidates is seen alone, or followed by a ''different'' candidate. That is, CR CR and LF LF issue two end of line markers each, but CR LF and LF CR issue only one marker. This idea takes care of Mac OS, Mac OS X, VMS and Unix, DOS and MIME, as well as probably other more obscure conventions.
|
||||
|
||||
==The C part of the implementation==
|
||||
|
||||
The low-level filter is divided into two simple functions. The inner function actually does the conversion. It takes each input character in turn, deciding what to output and how to modify the context. The context tells if the last character seen was a candidate and, if so, which candidate it was.
|
||||
{{{
|
||||
#define candidate(c) (c == CR || c == LF)
|
||||
static int process(int c, int last, const char *marker, luaL_Buffer *buffer) {
|
||||
if (candidate(c)) {
|
||||
if (candidate(last)) {
|
||||
if (c == last) luaL_addstring(buffer, marker);
|
||||
return 0;
|
||||
} else {
|
||||
luaL_addstring(buffer, marker);
|
||||
return c;
|
||||
}
|
||||
} else {
|
||||
luaL_putchar(buffer, c);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
}}}
|
||||
|
||||
The inner function makes use of Lua's auxiliary library's buffer interface for its efficiency and ease of use. The outer function simply interfaces with Lua. It receives the context and the input chunk (as well as an optional end-of-line marker), and returns the transformed output and the new context.
|
||||
{{{
|
||||
static int eol(lua_State *L) {
|
||||
int ctx = luaL_checkint(L, 1);
|
||||
size_t isize = 0;
|
||||
const char *input = luaL_optlstring(L, 2, NULL, &isize);
|
||||
const char *last = input + isize;
|
||||
const char *marker = luaL_optstring(L, 3, CRLF);
|
||||
luaL_Buffer buffer;
|
||||
luaL_buffinit(L, &buffer);
|
||||
if (!input) {
|
||||
lua_pushnil(L);
|
||||
lua_pushnumber(L, 0);
|
||||
return 2;
|
||||
}
|
||||
while (input < last)
|
||||
ctx = process(*input++, ctx, marker, &buffer);
|
||||
luaL_pushresult(&buffer);
|
||||
lua_pushnumber(L, ctx);
|
||||
return 2;
|
||||
}
|
||||
}}}
|
||||
|
||||
Notice that if the input chunk is {{nil}}, the operation is considered to be finished. In that case, the loop will not execute a single time and the context is reset to the initial state. This allows the filter to be reused indefinitely. It is a good idea to write filters like this, when possible.
|
||||
|
||||
Besides the end-of-line normalization filter shown above, many other filters can be implemented with the same ideas. Examples include Base64 and Quoted-Printable transfer content encodings, the breaking of text into lines, SMTP byte stuffing etc. The challenging part is to decide what will be the context. For line breaking, for instance, it could be the number of bytes left in the current line. For Base64 encoding, it could be the bytes that remain in the division of the input into 3-byte atoms.
|
||||
|
||||
===Chaining===
|
||||
|
||||
Filters become more powerful when the concept of chaining is introduced. Suppose you have a filter for Quoted-Printable encoding and you want to encode some text. According to the standard, the text has to be normalized into its canonic form prior to encoding. A nice interface that simplifies this task is a factory that creates a composite filter that passes data through multiple filters, but that can be used wherever a primitive filter is used.
|
||||
{{{
|
||||
local function chain2(f1, f2)
|
||||
return function(chunk)
|
||||
local ret = f2(f1(chunk))
|
||||
if chunk then return ret
|
||||
else return ret .. f2() end
|
||||
end
|
||||
end
|
||||
|
||||
function filter.chain(...)
|
||||
local arg = {...}
|
||||
local f = arg[1]
|
||||
for i = 2, #arg do
|
||||
f = chain2(f, arg[i])
|
||||
end
|
||||
return f
|
||||
end
|
||||
|
||||
local chain = filter.chain(normalize("\r\n"), encode("quoted-printable"))
|
||||
while 1 do
|
||||
local chunk = io.read(2048)
|
||||
io.write(chain(chunk))
|
||||
if not chunk then break end
|
||||
end
|
||||
}}}
|
||||
|
||||
The chaining factory is very simple. All it does is return a function that passes data through all filters and returns the result to the user. It uses the simpler auxiliary function that knows how to chain two filters together. In the auxiliary function, special care must be taken if the chunk is final. This is because the final chunk notification has to be pushed through both filters in turn. Thanks to the chain factory, it is easy to perform the Quoted-Printable conversion, as the above example shows.
|
||||
|
||||
===Sources, sinks, and pumps===
|
||||
|
||||
As we noted in the introduction, the filters we introduced so far act as the internal nodes in a network of transformations. Information flows from node to node (or rather from one filter to the next) and is transformed on its way out. Chaining filters together is the way we found to connect nodes in the network. But what about the end nodes? In the beginning of the network, we need a node that provides the data, a source. In the end of the network, we need a node that takes in the data, a sink.
|
||||
|
||||
==Sources==
|
||||
|
||||
We start with two simple sources. The first is the {{empty}} source: It simply returns no data, possibly returning an error message. The second is the {{file}} source, which produces the contents of a file in a chunk by chunk fashion, closing the file handle when done.
|
||||
{{{
|
||||
function source.empty(err)
|
||||
return function()
|
||||
return nil, err
|
||||
end
|
||||
end
|
||||
|
||||
function source.file(handle, io_err)
|
||||
if handle then
|
||||
return function()
|
||||
local chunk = handle:read(2048)
|
||||
if not chunk then handle:close() end
|
||||
return chunk
|
||||
end
|
||||
else return source.empty(io_err or "unable to open file") end
|
||||
end
|
||||
}}}
|
||||
|
||||
A source returns the next chunk of data each time it is called. When there is no more data, it just returns {{nil}}. If there is an error, the source can inform the caller by returning {{nil}} followed by an error message. Adrian Sietsma noticed that, although not on purpose, the interface for sources is compatible with the idea of iterators in Lua 5.0. That is, a data source can be nicely used in conjunction with {{for}} loops. Using our file source as an iterator, we can rewrite our first example:
|
||||
{{{
|
||||
local process = normalize("\r\n")
|
||||
for chunk in source.file(io.stdin) do
|
||||
io.write(process(chunk))
|
||||
end
|
||||
io.write(process(nil))
|
||||
}}}
|
||||
|
||||
Notice that the last call to the filter obtains the last chunk of processed data. The loop terminates when the source returns {{nil}} and therefore we need that final call outside of the loop.
|
||||
|
||||
==Maintaining state between calls==
|
||||
|
||||
It is often the case that a source needs to change its behavior after some event. One simple example would be a file source that wants to make sure it returns {{nil}} regardless of how many times it is called after the end of file, avoiding attempts to read past the end of the file. Another example would be a source that returns the contents of several files, as if they were concatenated, moving from one file to the next until the end of the last file is reached.
|
||||
|
||||
One way to implement this kind of source is to have the factory declare extra state variables that the source can use via lexical scoping. Our file source could set the file handle itself to {{nil}} when it detects the end-of-file. Then, every time the source is called, it could check if the handle is still valid and act accordingly:
|
||||
{{{
|
||||
function source.file(handle, io_err)
|
||||
if handle then
|
||||
return function()
|
||||
if not handle then return nil end
|
||||
local chunk = handle:read(2048)
|
||||
if not chunk then
|
||||
handle:close()
|
||||
handle = nil
|
||||
end
|
||||
return chunk
|
||||
end
|
||||
else return source.empty(io_err or "unable to open file") end
|
||||
end
|
||||
}}}
|
||||
|
||||
Another way to implement this behavior involves a change in the source interface to makes it more flexible. Let's allow a source to return a second value, besides the next chunk of data. If the returned chunk is {{nil}}, the extra return value tells us what happened. A second {{nil}} means that there is just no more data and the source is empty. Any other value is considered to be an error message. On the other hand, if the chunk was ''not'' {{nil}}, the second return value tells us whether the source wants to be replaced. If it is {{nil}}, we should proceed using the same source. Otherwise it has to be another source, which we have to use from then on, to get the remaining data.
|
||||
|
||||
This extra freedom is good for someone writing a source function, but it is a pain for those that have to use it. Fortunately, given one of these ''fancy'' sources, we can transform it into a simple source that never needs to be replaced, using the following factory.
|
||||
{{{
|
||||
function source.simplify(src)
|
||||
return function()
|
||||
local chunk, err_or_new = src()
|
||||
src = err_or_new or src
|
||||
if not chunk then return nil, err_or_new
|
||||
else return chunk end
|
||||
end
|
||||
end
|
||||
}}}
|
||||
|
||||
The simplification factory allows us to write fancy sources and use them as if they were simple. Therefore, our next functions will only produce simple sources, and functions that take sources will assume they are simple.
|
||||
|
||||
Going back to our file source, the extended interface allows for a more elegant implementation. The new source just asks to be replaced by an empty source as soon as there is no more data. There is no repeated checking of the handle. To make things simpler to the user, the factory itself simplifies the the fancy file source before returning it to the user:
|
||||
{{{
|
||||
function source.file(handle, io_err)
|
||||
if handle then
|
||||
return source.simplify(function()
|
||||
local chunk = handle:read(2048)
|
||||
if not chunk then
|
||||
handle:close()
|
||||
return "", source.empty()
|
||||
end
|
||||
return chunk
|
||||
end)
|
||||
else return source.empty(io_err or "unable to open file") end
|
||||
end
|
||||
}}}
|
||||
|
||||
We can make these ideas even more powerful if we use a new feature of Lua 5.0: coroutines. Coroutines suffer from a great lack of advertisement, and I am going to play my part here. Just like lexical scoping, coroutines taste odd at first, but once you get used with the concept, it can save your day. I have to admit that using coroutines to implement our file source would be overkill, so let's implement a concatenated source factory instead.
|
||||
{{{
|
||||
function source.cat(...)
|
||||
local arg = {...}
|
||||
local co = coroutine.create(function()
|
||||
local i = 1
|
||||
while i <= #arg do
|
||||
local chunk, err = arg[i]()
|
||||
if chunk then coroutine.yield(chunk)
|
||||
elseif err then return nil, err
|
||||
else i = i + 1 end
|
||||
end
|
||||
end)
|
||||
return function()
|
||||
return shift(coroutine.resume(co))
|
||||
end
|
||||
end
|
||||
}}}
|
||||
|
||||
The factory creates two functions. The first is an auxiliary that does all the work, in the form of a coroutine. It reads a chunk from one of the sources. If the chunk is {{nil}}, it moves to the next source, otherwise it just yields returning the chunk. When it is resumed, it continues from where it stopped and tries to read the next chunk. The second function is the source itself, and just resumes the execution of the auxiliary coroutine, returning to the user whatever chunks it returns (skipping the first result that tells us if the coroutine terminated). Imagine writing the same function without coroutines and you will notice the simplicity of this implementation. We will use coroutines again when we make the filter interface more powerful.
|
||||
|
||||
==Chaining Sources==
|
||||
|
||||
What does it mean to chain a source with a filter? The most useful interpretation is that the combined source-filter is a new source that produces data and passes it through the filter before returning it. Here is a factory that does it:
|
||||
{{{
|
||||
function source.chain(src, f)
|
||||
return source.simplify(function()
|
||||
local chunk, err = src()
|
||||
if not chunk then return f(nil), source.empty(err)
|
||||
else return f(chunk) end
|
||||
end)
|
||||
end
|
||||
}}}
|
||||
|
||||
Our motivating example in the introduction chains a source with a filter. The idea of chaining a source with a filter is useful when one thinks about functions that might get their input data from a source. By chaining a simple source with one or more filters, the same function can be provided with filtered data even though it is unaware of the filtering that is happening behind its back.
|
||||
|
||||
==Sinks==
|
||||
|
||||
Just as we defined an interface for an initial source of data, we can also define an interface for a final destination of data. We call any function respecting that interface a ''sink''. Below are two simple factories that return sinks. The table factory creates a sink that stores all obtained data into a table. The data can later be efficiently concatenated into a single string with the {{table.concat}} library function. As another example, we introduce the {{null}} sink: A sink that simply discards the data it receives.
|
||||
{{{
|
||||
function sink.table(t)
|
||||
t = t or {}
|
||||
local f = function(chunk, err)
|
||||
if chunk then table.insert(t, chunk) end
|
||||
return 1
|
||||
end
|
||||
return f, t
|
||||
end
|
||||
|
||||
local function null()
|
||||
return 1
|
||||
end
|
||||
|
||||
function sink.null()
|
||||
return null
|
||||
end
|
||||
}}}
|
||||
|
||||
Sinks receive consecutive chunks of data, until the end of data is notified with a {{nil}} chunk. An error is notified by an extra argument giving an error message after the {{nil}} chunk. If a sink detects an error itself and wishes not to be called again, it should return {{nil}}, optionally followed by an error message. A return value that is not {{nil}} means the source will accept more data. Finally, just as sources can choose to be replaced, so can sinks, following the same interface. Once again, it is easy to implement a {{sink.simplify}} factory that transforms a fancy sink into a simple sink.
|
||||
|
||||
As an example, let's create a source that reads from the standard input, then chain it with a filter that normalizes the end-of-line convention and let's use a sink to place all data into a table, printing the result in the end.
|
||||
{{{
|
||||
local load = source.chain(source.file(io.stdin), normalize("\r\n"))
|
||||
local store, t = sink.table()
|
||||
while 1 do
|
||||
local chunk = load()
|
||||
store(chunk)
|
||||
if not chunk then break end
|
||||
end
|
||||
print(table.concat(t))
|
||||
}}}
|
||||
|
||||
Again, just as we created a factory that produces a chained source-filter from a source and a filter, it is easy to create a factory that produces a new sink given a sink and a filter. The new sink passes all data it receives through the filter before handing it in to the original sink. Here is the implementation:
|
||||
{{{
|
||||
function sink.chain(f, snk)
|
||||
return function(chunk, err)
|
||||
local r, e = snk(f(chunk))
|
||||
if not r then return nil, e end
|
||||
if not chunk then return snk(nil, err) end
|
||||
return 1
|
||||
end
|
||||
end
|
||||
}}}
|
||||
|
||||
==Pumps==
|
||||
|
||||
There is a while loop that has been around for too long in our examples. It's always there because everything that we designed so far is passive. Sources, sinks, filters: None of them will do anything on their own. The operation of pumping all data a source can provide into a sink is so common that we will provide a couple helper functions to do that for us.
|
||||
{{{
|
||||
function pump.step(src, snk)
|
||||
local chunk, src_err = src()
|
||||
local ret, snk_err = snk(chunk, src_err)
|
||||
return chunk and ret and not src_err and not snk_err, src_err or snk_err
|
||||
end
|
||||
|
||||
function pump.all(src, snk, step)
|
||||
step = step or pump.step
|
||||
while true do
|
||||
local ret, err = step(src, snk)
|
||||
if not ret then return not err, err end
|
||||
end
|
||||
end
|
||||
}}}
|
||||
|
||||
The {{pump.step}} function moves one chunk of data from the source to the sink. The {{pump.all}} function takes an optional {{step}} function and uses it to pump all the data from the source to the sink. We can now use everything we have to write a program that reads a binary file from disk and stores it in another file, after encoding it to the Base64 transfer content encoding:
|
||||
{{{
|
||||
local load = source.chain(
|
||||
source.file(io.open("input.bin", "rb")),
|
||||
encode("base64")
|
||||
)
|
||||
local store = sink.chain(
|
||||
wrap(76),
|
||||
sink.file(io.open("output.b64", "w")),
|
||||
)
|
||||
pump.all(load, store)
|
||||
}}}
|
||||
|
||||
The way we split the filters here is not intuitive, on purpose. Alternatively, we could have chained the Base64 encode filter and the line-wrap filter together, and then chain the resulting filter with either the file source or the file sink. It doesn't really matter.
|
||||
|
||||
===One last important change===
|
||||
|
||||
Turns out we still have a problem. When David Burgess was writing his gzip filter, he noticed that the decompression filter can explode a small input chunk into a huge amount of data. Although we wished we could ignore this problem, we soon agreed we couldn't. The only solution is to allow filters to return partial results, and that is what we chose to do. After invoking the filter to pass input data, the user now has to loop invoking the filter to find out if it has more output data to return. Note that these extra calls can't pass more data to the filter.
|
||||
|
||||
More specifically, after passing a chunk of input data to a filter and collecting the first chunk of output data, the user invokes the filter repeatedly, passing the empty string, to get extra output chunks. When the filter itself returns an empty string, the user knows there is no more output data, and can proceed to pass the next input chunk. In the end, after the user passes a {{nil}} notifying the filter that there is no more input data, the filter might still have produced too much output data to return in a single chunk. The user has to loop again, this time passing {{nil}} each time, until the filter itself returns {{nil}} to notify the user it is finally done.
|
||||
|
||||
Most filters won't need this extra freedom. Fortunately, the new filter interface is easy to implement. In fact, the end-of-line translation filter we created in the introduction already conforms to it. On the other hand, the chaining function becomes much more complicated. If it wasn't for coroutines, I wouldn't be happy to implement it. Let me know if you can find a simpler implementation that does not use coroutines!
|
||||
{{{
|
||||
local function chain2(f1, f2)
|
||||
local co = coroutine.create(function(chunk)
|
||||
while true do
|
||||
local filtered1 = f1(chunk)
|
||||
local filtered2 = f2(filtered1)
|
||||
local done2 = filtered1 and ""
|
||||
while true do
|
||||
if filtered2 == "" or filtered2 == nil then break end
|
||||
coroutine.yield(filtered2)
|
||||
filtered2 = f2(done2)
|
||||
end
|
||||
if filtered1 == "" then chunk = coroutine.yield(filtered1)
|
||||
elseif filtered1 == nil then return nil
|
||||
else chunk = chunk and "" end
|
||||
end
|
||||
end)
|
||||
return function(chunk)
|
||||
local _, res = coroutine.resume(co, chunk)
|
||||
return res
|
||||
end
|
||||
end
|
||||
}}}
|
||||
|
||||
Chaining sources also becomes more complicated, but a similar solution is possible with coroutines. Chaining sinks is just as simple as it has always been. Interestingly, these modifications do not have a measurable negative impact in the the performance of filters that didn't need the added flexibility. They do severely improve the efficiency of filters like the gzip filter, though, and that is why we are keeping them.
|
||||
|
||||
===Final considerations===
|
||||
|
||||
These ideas were created during the development of {{LuaSocket}}[http://www.tecgraf.puc-rio.br/luasocket] 2.0, and are available as the LTN12 module. As a result, {{LuaSocket}}[http://www.tecgraf.puc-rio.br/luasocket] implementation was greatly simplified and became much more powerful. The MIME module is especially integrated to LTN12 and provides many other filters. We felt these concepts deserved to be made public even to those that don't care about {{LuaSocket}}[http://www.tecgraf.puc-rio.br/luasocket], hence the LTN.
|
||||
|
||||
One extra application that deserves mentioning makes use of an identity filter. Suppose you want to provide some feedback to the user while a file is being downloaded into a sink. Chaining the sink with an identity filter (a filter that simply returns the received data unaltered), you can update a progress counter on the fly. The original sink doesn't have to be modified. Another interesting idea is that of a T sink: A sink that sends data to two other sinks. In summary, there appears to be enough room for many other interesting ideas.
|
||||
|
||||
In this technical note we introduced filters, sources, sinks, and pumps. These are useful tools for data processing in general. Sources provide a simple abstraction for data acquisition. Sinks provide an abstraction for final data destinations. Filters define an interface for data transformations. The chaining of filters, sources and sinks provides an elegant way to create arbitrarily complex data transformation from simpler transformations. Pumps just put the machinery to work.
|
||||
|
|
@ -0,0 +1,194 @@
|
|||
===Using finalized exceptions===
|
||||
==or How to get rid of all those if statements==
|
||||
by DiegoNehab
|
||||
|
||||
{{{
|
||||
|
||||
}}}
|
||||
|
||||
===Abstract===
|
||||
This little LTN describes a simple exception scheme that greatly simplifies error checking in Lua programs. All the needed functionality ships standard with Lua, but is hidden between the {{assert}} and {{pcall}} functions. To make it more evident, we stick to a convenient standard (you probably already use anyways) for Lua function return values, and define two very simple helper functions (either in C or in Lua itself).
|
||||
|
||||
===Introduction===
|
||||
|
||||
Most Lua functions return {{nil}} in case of error, followed by a message describing the error. If you don't use this convention, you probably have good reasons. Hopefully, after reading on, you will realize your reasons are not good enough.
|
||||
|
||||
If you are like me, you hate error checking. Most nice little code snippets that look beautiful when you first write them lose some of their charm when you add all that error checking code. Yet, error checking is as important as the rest of the code. How sad.
|
||||
|
||||
Even if you stick to a return convention, any complex task involving several function calls makes error checking both boring and error-prone (do you see the ''error'' below?)
|
||||
{{{
|
||||
function task(arg1, arg2, ...)
|
||||
local ret1, err = task1(arg1)
|
||||
if not ret1 then
|
||||
cleanup1()
|
||||
return nil, error
|
||||
end
|
||||
local ret2, err = task2(arg2)
|
||||
if not ret then
|
||||
cleanup2()
|
||||
return nil, error
|
||||
end
|
||||
...
|
||||
end
|
||||
}}}
|
||||
|
||||
The standard {{assert}} function provides an interesting alternative. To use it, simply nest every function call to be error checked with a call to {{assert}}. The {{assert}} function checks the value of its first argument. If it is {{nil}}, {{assert}} throws the second argument as an error message. Otherwise, {{assert}} lets all arguments through as if had not been there. The idea greatly simplifies error checking:
|
||||
{{{
|
||||
function task(arg1, arg2, ...)
|
||||
local ret1 = assert(task1(arg1))
|
||||
local ret2 = assert(task2(arg2))
|
||||
...
|
||||
end
|
||||
}}}
|
||||
|
||||
If any task fails, the execution is aborted by {{assert}} and the error message is displayed to the user as the cause of the problem. If no error happens, the task completes as before. There isn't a single {{if}} statement and this is great. However, there are some problems with the idea.
|
||||
|
||||
First, the topmost {{task}} function doesn't respect the protocol followed by the lower-level tasks: It raises an error instead of returning {{nil}} followed by the error messages. Here is where the standard {{pcall}} comes in handy.
|
||||
{{{
|
||||
function xtask(arg1, arg2, ...)
|
||||
local ret1 = assert(task1(arg1))
|
||||
local ret2 = assert(task2(arg2))
|
||||
...
|
||||
end
|
||||
|
||||
function task(arg1, arg2, ...)
|
||||
local ok, ret_or_err = pcall(xtask, arg1, arg2, ...)
|
||||
if ok then return ret_or_err
|
||||
else return nil, ret_or_err end
|
||||
end
|
||||
}}}
|
||||
|
||||
Our new {{task}} function is well behaved. {{Pcall}} catches any error raised by the calls to {{assert}} and returns it after the status code. That way, errors don't get propagated to the user of the high level {{task}} function.
|
||||
|
||||
These are the main ideas for our exception scheme, but there are still a few glitches to fix:
|
||||
|
||||
* Directly using {{pcall}} ruined the simplicity of the code;
|
||||
* What happened to the cleanup function calls? What if we have to, say, close a file?
|
||||
* {{Assert}} messes with the error message before raising the error (it adds line number information).
|
||||
|
||||
Fortunately, all these problems are very easy to solve and that's what we do in the following sections.
|
||||
|
||||
== Introducing the {{protect}} factory ==
|
||||
|
||||
We used the {{pcall}} function to shield the user from errors that could be raised by the underlying implementation. Instead of directly using {{pcall}} (and thus duplicating code) every time we prefer a factory that does the same job:
|
||||
{{{
|
||||
local function pack(ok, ...)
|
||||
return ok, {...}
|
||||
end
|
||||
|
||||
function protect(f)
|
||||
return function(...)
|
||||
local ok, ret = pack(pcall(f, ...))
|
||||
if ok then return unpack(ret)
|
||||
else return nil, ret[1] end
|
||||
end
|
||||
end
|
||||
}}}
|
||||
|
||||
The {{protect}} factory receives a function that might raise exceptions and returns a function that respects our return value convention. Now we can rewrite the top-level {{task}} function in a much cleaner way:
|
||||
{{{
|
||||
task = protect(function(arg1, arg2, ...)
|
||||
local ret1 = assert(task1(arg1))
|
||||
local ret2 = assert(task2(arg2))
|
||||
...
|
||||
end)
|
||||
}}}
|
||||
|
||||
The Lua implementation of the {{protect}} factory suffers with the creation of tables to hold multiple arguments and return values. It is possible (and easy) to implement the same function in C, without any table creation.
|
||||
{{{
|
||||
static int safecall(lua_State *L) {
|
||||
lua_pushvalue(L, lua_upvalueindex(1));
|
||||
lua_insert(L, 1);
|
||||
if (lua_pcall(L, lua_gettop(L) - 1, LUA_MULTRET, 0) != 0) {
|
||||
lua_pushnil(L);
|
||||
lua_insert(L, 1);
|
||||
return 2;
|
||||
} else return lua_gettop(L);
|
||||
}
|
||||
|
||||
static int protect(lua_State *L) {
|
||||
lua_pushcclosure(L, safecall, 1);
|
||||
return 1;
|
||||
}
|
||||
}}}
|
||||
|
||||
===The {{newtry}} factory===
|
||||
|
||||
Let's solve the two remaining issues with a single shot and use a concrete example to illustrate the proposed solution. Suppose you want to write a function to download an HTTP document. You have to connect, send the request and read the reply. Each of these tasks can fail, but if something goes wrong after you connected, you have to close the connection before returning the error message.
|
||||
{{{
|
||||
get = protect(function(host, path)
|
||||
local c
|
||||
-- create a try function with a finalizer to close the socket
|
||||
local try = newtry(function()
|
||||
if c then c:close() end
|
||||
end)
|
||||
-- connect and send request
|
||||
c = try(connect(host, 80))
|
||||
try(c:send("GET " .. path .. " HTTP/1.0\r\n\r\n"))
|
||||
-- get headers
|
||||
local h = {}
|
||||
while 1 do
|
||||
l = try(c:receive())
|
||||
if l == "" then break end
|
||||
table.insert(h, l)
|
||||
end
|
||||
-- get body
|
||||
local b = try(c:receive("*a"))
|
||||
c:close()
|
||||
return b, h
|
||||
end)
|
||||
}}}
|
||||
|
||||
The {{newtry}} factory returns a function that works just like {{assert}}. The differences are that the {{try}} function doesn't mess with the error message and it calls an optional ''finalizer'' before raising the error. In our example, the finalizer simply closes the socket.
|
||||
|
||||
Even with a simple example like this, we see that the finalized exceptions simplified our life. Let's see what we gain in general, not just in this example:
|
||||
|
||||
* We don't need to declare dummy variables to hold error messages in case any ever shows up;
|
||||
* We avoid using a variable to hold something that could either be a return value or an error message;
|
||||
* We didn't have to use several ''if'' statements to check for errors;
|
||||
* If an error happens, we know our finalizer is going to be invoked automatically;
|
||||
* Exceptions get propagated, so we don't repeat these ''if'' statements until the error reaches the user.
|
||||
|
||||
Try writing the same function without the tricks we used above and you will see that the code gets ugly. Longer sequences of operations with error checking would get even uglier. So let's implement the {{newtry}} function in Lua:
|
||||
{{{
|
||||
function newtry(f)
|
||||
return function(...)
|
||||
if not arg[1] then
|
||||
if f then f() end
|
||||
error(arg[2], 0)
|
||||
else
|
||||
return ...
|
||||
end
|
||||
end
|
||||
end
|
||||
}}}
|
||||
|
||||
Again, the implementation suffers from the creation of tables at each function call, so we prefer the C version:
|
||||
{{{
|
||||
static int finalize(lua_State *L) {
|
||||
if (!lua_toboolean(L, 1)) {
|
||||
lua_pushvalue(L, lua_upvalueindex(1));
|
||||
lua_pcall(L, 0, 0, 0);
|
||||
lua_settop(L, 2);
|
||||
lua_error(L);
|
||||
return 0;
|
||||
} else return lua_gettop(L);
|
||||
}
|
||||
|
||||
static int do_nothing(lua_State *L) {
|
||||
(void) L;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int newtry(lua_State *L) {
|
||||
lua_settop(L, 1);
|
||||
if (lua_isnil(L, 1))
|
||||
lua_pushcfunction(L, do_nothing);
|
||||
lua_pushcclosure(L, finalize, 1);
|
||||
return 1;
|
||||
}
|
||||
}}}
|
||||
|
||||
===Final considerations===
|
||||
|
||||
The {{protect}} and {{newtry}} functions saved a ''lot'' of work in the implementation of {{LuaSocket}}[http://www.tecgraf.puc-rio.br/luasocket]. The size of some modules was cut in half by the these ideas. It's true the scheme is not as generic as the exception mechanism of programming languages like C++ or Java, but the power/simplicity ratio is favorable and I hope it serves you as well as it served {{LuaSocket}}.
|
||||
|
|
@ -0,0 +1,135 @@
|
|||
package = "LuaSocket"
|
||||
version = "scm-3"
|
||||
source = {
|
||||
url = "git+https://github.com/lunarmodules/luasocket.git",
|
||||
branch = "master"
|
||||
}
|
||||
description = {
|
||||
summary = "Network support for the Lua language",
|
||||
detailed = [[
|
||||
LuaSocket is a Lua extension library composed of two parts: a set of C
|
||||
modules that provide support for the TCP and UDP transport layers, and a
|
||||
set of Lua modules that provide functions commonly needed by applications
|
||||
that deal with the Internet.
|
||||
]],
|
||||
homepage = "https://github.com/lunarmodules/luasocket",
|
||||
license = "MIT"
|
||||
}
|
||||
dependencies = {
|
||||
"lua >= 5.1"
|
||||
}
|
||||
|
||||
local function make_plat(plat)
|
||||
local defines = {
|
||||
unix = {
|
||||
"LUASOCKET_DEBUG"
|
||||
},
|
||||
macosx = {
|
||||
"LUASOCKET_DEBUG",
|
||||
"UNIX_HAS_SUN_LEN"
|
||||
},
|
||||
win32 = {
|
||||
"LUASOCKET_DEBUG",
|
||||
"NDEBUG"
|
||||
},
|
||||
mingw32 = {
|
||||
"LUASOCKET_DEBUG",
|
||||
-- "LUASOCKET_INET_PTON",
|
||||
"WINVER=0x0501"
|
||||
}
|
||||
}
|
||||
local modules = {
|
||||
["socket.core"] = {
|
||||
sources = {
|
||||
"src/luasocket.c"
|
||||
, "src/timeout.c"
|
||||
, "src/buffer.c"
|
||||
, "src/io.c"
|
||||
, "src/auxiliar.c"
|
||||
, "src/options.c"
|
||||
, "src/inet.c"
|
||||
, "src/except.c"
|
||||
, "src/select.c"
|
||||
, "src/tcp.c"
|
||||
, "src/udp.c"
|
||||
, "src/compat.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "/src"
|
||||
},
|
||||
["mime.core"] = {
|
||||
sources = { "src/mime.c", "src/compat.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "/src"
|
||||
},
|
||||
["socket.http"] = "src/http.lua",
|
||||
["socket.url"] = "src/url.lua",
|
||||
["socket.tp"] = "src/tp.lua",
|
||||
["socket.ftp"] = "src/ftp.lua",
|
||||
["socket.headers"] = "src/headers.lua",
|
||||
["socket.smtp"] = "src/smtp.lua",
|
||||
ltn12 = "src/ltn12.lua",
|
||||
socket = "src/socket.lua",
|
||||
mime = "src/mime.lua"
|
||||
}
|
||||
if plat == "unix"
|
||||
or plat == "macosx"
|
||||
or plat == "haiku"
|
||||
then
|
||||
modules["socket.core"].sources[#modules["socket.core"].sources+1] = "src/usocket.c"
|
||||
if plat == "haiku" then
|
||||
modules["socket.core"].libraries = {"network"}
|
||||
end
|
||||
modules["socket.unix"] = {
|
||||
sources = {
|
||||
"src/buffer.c"
|
||||
, "src/compat.c"
|
||||
, "src/auxiliar.c"
|
||||
, "src/options.c"
|
||||
, "src/timeout.c"
|
||||
, "src/io.c"
|
||||
, "src/usocket.c"
|
||||
, "src/unix.c"
|
||||
, "src/unixdgram.c"
|
||||
, "src/unixstream.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "/src"
|
||||
}
|
||||
modules["socket.serial"] = {
|
||||
sources = {
|
||||
"src/buffer.c"
|
||||
, "src/compat.c"
|
||||
, "src/auxiliar.c"
|
||||
, "src/options.c"
|
||||
, "src/timeout.c"
|
||||
, "src/io.c"
|
||||
, "src/usocket.c"
|
||||
, "src/serial.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "/src"
|
||||
}
|
||||
end
|
||||
if plat == "win32"
|
||||
or plat == "mingw32"
|
||||
then
|
||||
modules["socket.core"].sources[#modules["socket.core"].sources+1] = "src/wsocket.c"
|
||||
modules["socket.core"].libraries = { "ws2_32" }
|
||||
modules["socket.core"].libdirs = {}
|
||||
end
|
||||
return { modules = modules }
|
||||
end
|
||||
|
||||
build = {
|
||||
type = "builtin",
|
||||
platforms = {
|
||||
unix = make_plat("unix"),
|
||||
macosx = make_plat("macosx"),
|
||||
haiku = make_plat("haiku"),
|
||||
win32 = make_plat("win32"),
|
||||
mingw32 = make_plat("mingw32")
|
||||
},
|
||||
copy_directories = {
|
||||
"docs"
|
||||
, "samples"
|
||||
, "etc"
|
||||
, "test" }
|
||||
}
|
||||
|
|
@ -0,0 +1,35 @@
|
|||
Microsoft Visual Studio Solution File, Format Version 12.00
|
||||
# Visual Studio 2012
|
||||
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "socket", "socket.vcxproj", "{66E3CE14-884D-4AEA-9F20-15A0BEAF8C5A}"
|
||||
EndProject
|
||||
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "mime", "mime.vcxproj", "{128E8BD0-174A-48F0-8771-92B1E8D18713}"
|
||||
EndProject
|
||||
Global
|
||||
GlobalSection(SolutionConfigurationPlatforms) = preSolution
|
||||
Debug|Win32 = Debug|Win32
|
||||
Debug|x64 = Debug|x64
|
||||
Release|Win32 = Release|Win32
|
||||
Release|x64 = Release|x64
|
||||
EndGlobalSection
|
||||
GlobalSection(ProjectConfigurationPlatforms) = postSolution
|
||||
{66E3CE14-884D-4AEA-9F20-15A0BEAF8C5A}.Debug|Win32.ActiveCfg = Debug|Win32
|
||||
{66E3CE14-884D-4AEA-9F20-15A0BEAF8C5A}.Debug|Win32.Build.0 = Debug|Win32
|
||||
{66E3CE14-884D-4AEA-9F20-15A0BEAF8C5A}.Debug|x64.ActiveCfg = Debug|x64
|
||||
{66E3CE14-884D-4AEA-9F20-15A0BEAF8C5A}.Debug|x64.Build.0 = Debug|x64
|
||||
{66E3CE14-884D-4AEA-9F20-15A0BEAF8C5A}.Release|Win32.ActiveCfg = Release|Win32
|
||||
{66E3CE14-884D-4AEA-9F20-15A0BEAF8C5A}.Release|Win32.Build.0 = Release|Win32
|
||||
{66E3CE14-884D-4AEA-9F20-15A0BEAF8C5A}.Release|x64.ActiveCfg = Release|x64
|
||||
{66E3CE14-884D-4AEA-9F20-15A0BEAF8C5A}.Release|x64.Build.0 = Release|x64
|
||||
{128E8BD0-174A-48F0-8771-92B1E8D18713}.Debug|Win32.ActiveCfg = Debug|Win32
|
||||
{128E8BD0-174A-48F0-8771-92B1E8D18713}.Debug|Win32.Build.0 = Debug|Win32
|
||||
{128E8BD0-174A-48F0-8771-92B1E8D18713}.Debug|x64.ActiveCfg = Debug|x64
|
||||
{128E8BD0-174A-48F0-8771-92B1E8D18713}.Debug|x64.Build.0 = Debug|x64
|
||||
{128E8BD0-174A-48F0-8771-92B1E8D18713}.Release|Win32.ActiveCfg = Release|Win32
|
||||
{128E8BD0-174A-48F0-8771-92B1E8D18713}.Release|Win32.Build.0 = Release|Win32
|
||||
{128E8BD0-174A-48F0-8771-92B1E8D18713}.Release|x64.ActiveCfg = Release|x64
|
||||
{128E8BD0-174A-48F0-8771-92B1E8D18713}.Release|x64.Build.0 = Release|x64
|
||||
EndGlobalSection
|
||||
GlobalSection(SolutionProperties) = preSolution
|
||||
HideSolutionNode = FALSE
|
||||
EndGlobalSection
|
||||
EndGlobal
|
||||
|
|
@ -0,0 +1 @@
|
|||
make DEBUG=DEBUG PLAT=macosx LUAINC_macosx_base=/Users/$USER/build/macosx/include LUAPREFIX_macosx=/Users/$USER/build/macosx install-both
|
||||
|
|
@ -0,0 +1,55 @@
|
|||
# luasocket makefile
|
||||
#
|
||||
# see src/makefile for description of how to customize the build
|
||||
#
|
||||
# Targets:
|
||||
# install install system independent support
|
||||
# install-unix also install unix-only support
|
||||
# install-both install for lua51 lua52 lua53
|
||||
# install-both-unix also install unix-only
|
||||
# print print the build settings
|
||||
|
||||
PLAT?= linux
|
||||
PLATS= macosx linux win32 win64 mingw freebsd solaris
|
||||
|
||||
all: $(PLAT)
|
||||
|
||||
$(PLATS) none install install-unix local clean:
|
||||
$(MAKE) -C src $@
|
||||
|
||||
print:
|
||||
$(MAKE) -C src $@
|
||||
|
||||
test:
|
||||
lua test/hello.lua
|
||||
|
||||
install-both:
|
||||
$(MAKE) clean
|
||||
@cd src; $(MAKE) $(PLAT) LUAV=5.1
|
||||
@cd src; $(MAKE) install LUAV=5.1
|
||||
$(MAKE) clean
|
||||
@cd src; $(MAKE) $(PLAT) LUAV=5.2
|
||||
@cd src; $(MAKE) install LUAV=5.2
|
||||
$(MAKE) clean
|
||||
@cd src; $(MAKE) $(PLAT) LUAV=5.3
|
||||
@cd src; $(MAKE) install LUAV=5.3
|
||||
$(MAKE) clean
|
||||
@cd src; $(MAKE) $(PLAT) LUAV=5.4
|
||||
@cd src; $(MAKE) install LUAV=5.4
|
||||
|
||||
install-both-unix:
|
||||
$(MAKE) clean
|
||||
@cd src; $(MAKE) $(PLAT) LUAV=5.1
|
||||
@cd src; $(MAKE) install-unix LUAV=5.1
|
||||
$(MAKE) clean
|
||||
@cd src; $(MAKE) $(PLAT) LUAV=5.2
|
||||
@cd src; $(MAKE) install-unix LUAV=5.2
|
||||
$(MAKE) clean
|
||||
@cd src; $(MAKE) $(PLAT) LUAV=5.3
|
||||
@cd src; $(MAKE) install-unix LUAV=5.3
|
||||
$(MAKE) clean
|
||||
@cd src; $(MAKE) $(PLAT) LUAV=5.4
|
||||
@cd src; $(MAKE) install-unix LUAV=5.4
|
||||
|
||||
.PHONY: test
|
||||
|
||||
|
|
@ -0,0 +1,139 @@
|
|||
#--------------------------------------------------------------------------
|
||||
# Distribution makefile
|
||||
#--------------------------------------------------------------------------
|
||||
DIST = luasocket-3.0.0
|
||||
|
||||
TEST = \
|
||||
test/README \
|
||||
test/hello.lua \
|
||||
test/testclnt.lua \
|
||||
test/testsrvr.lua \
|
||||
test/testsupport.lua
|
||||
|
||||
SAMPLES = \
|
||||
samples/README \
|
||||
samples/cddb.lua \
|
||||
samples/daytimeclnt.lua \
|
||||
samples/echoclnt.lua \
|
||||
samples/echosrvr.lua \
|
||||
samples/mclisten.lua \
|
||||
samples/mcsend.lua \
|
||||
samples/listener.lua \
|
||||
samples/lpr.lua \
|
||||
samples/talker.lua \
|
||||
samples/tinyirc.lua
|
||||
|
||||
ETC = \
|
||||
etc/README \
|
||||
etc/b64.lua \
|
||||
etc/check-links.lua \
|
||||
etc/check-memory.lua \
|
||||
etc/dict.lua \
|
||||
etc/dispatch.lua \
|
||||
etc/eol.lua \
|
||||
etc/forward.lua \
|
||||
etc/get.lua \
|
||||
etc/lp.lua \
|
||||
etc/qp.lua \
|
||||
etc/tftp.lua
|
||||
|
||||
SRC = \
|
||||
src/makefile \
|
||||
src/auxiliar.c \
|
||||
src/auxiliar.h \
|
||||
src/buffer.c \
|
||||
src/buffer.h \
|
||||
src/except.c \
|
||||
src/except.h \
|
||||
src/inet.c \
|
||||
src/inet.h \
|
||||
src/io.c \
|
||||
src/io.h \
|
||||
src/luasocket.c \
|
||||
src/luasocket.h \
|
||||
src/mime.c \
|
||||
src/mime.h \
|
||||
src/options.c \
|
||||
src/options.h \
|
||||
src/select.c \
|
||||
src/select.h \
|
||||
src/socket.h \
|
||||
src/tcp.c \
|
||||
src/tcp.h \
|
||||
src/timeout.c \
|
||||
src/timeout.h \
|
||||
src/udp.c \
|
||||
src/udp.h \
|
||||
src/unix.c \
|
||||
src/serial.c \
|
||||
src/unix.h \
|
||||
src/usocket.c \
|
||||
src/usocket.h \
|
||||
src/wsocket.c \
|
||||
src/wsocket.h \
|
||||
src/ftp.lua \
|
||||
src/http.lua \
|
||||
src/ltn12.lua \
|
||||
src/mime.lua \
|
||||
src/smtp.lua \
|
||||
src/socket.lua \
|
||||
src/headers.lua \
|
||||
src/tp.lua \
|
||||
src/url.lua
|
||||
|
||||
MAKE = \
|
||||
makefile \
|
||||
luasocket.sln \
|
||||
luasocket-scm-0.rockspec \
|
||||
Lua51.props \
|
||||
Lua52.props \
|
||||
socket.vcxproj.filters \
|
||||
mime.vcxproj.filters \
|
||||
socket.vcxproj \
|
||||
mime.vcxproj
|
||||
|
||||
DOCS = \
|
||||
docs/dns.html \
|
||||
docs/ftp.html \
|
||||
docs/index.html \
|
||||
docs/http.html \
|
||||
docs/installation.html \
|
||||
docs/introduction.html \
|
||||
docs/ltn12.html \
|
||||
docs/luasocket.png \
|
||||
docs/mime.html \
|
||||
docs/reference.css \
|
||||
docs/reference.html \
|
||||
docs/smtp.html \
|
||||
docs/socket.html \
|
||||
docs/tcp.html \
|
||||
docs/udp.html \
|
||||
docs/url.html
|
||||
|
||||
dist:
|
||||
mkdir -p $(DIST)
|
||||
cp -vf CHANGELOG.md $(DIST)
|
||||
cp -vf LICENSE $(DIST)
|
||||
cp -vf README.md $(DIST)
|
||||
cp -vf $(MAKE) $(DIST)
|
||||
|
||||
mkdir -p $(DIST)/etc
|
||||
cp -vf $(ETC) $(DIST)/etc
|
||||
|
||||
mkdir -p $(DIST)/src
|
||||
cp -vf $(SRC) $(DIST)/src
|
||||
|
||||
mkdir -p $(DIST)/docs
|
||||
cp -vf $(DOCS) $(DIST)/docs
|
||||
|
||||
mkdir -p $(DIST)/samples
|
||||
cp -vf $(SAMPLES) $(DIST)/samples
|
||||
|
||||
mkdir -p $(DIST)/test
|
||||
cp -vf $(TEST) $(DIST)/test
|
||||
|
||||
tar -zcvf $(DIST).tar.gz $(DIST)
|
||||
zip -r $(DIST).zip $(DIST)
|
||||
|
||||
clean:
|
||||
\rm -rf $(DIST) $(DIST).tar.gz $(DIST).zip
|
||||
|
|
@ -0,0 +1,205 @@
|
|||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
|
||||
<ItemGroup Label="ProjectConfigurations">
|
||||
<ProjectConfiguration Include="Debug|Win32">
|
||||
<Configuration>Debug</Configuration>
|
||||
<Platform>Win32</Platform>
|
||||
</ProjectConfiguration>
|
||||
<ProjectConfiguration Include="Debug|x64">
|
||||
<Configuration>Debug</Configuration>
|
||||
<Platform>x64</Platform>
|
||||
</ProjectConfiguration>
|
||||
<ProjectConfiguration Include="Release|Win32">
|
||||
<Configuration>Release</Configuration>
|
||||
<Platform>Win32</Platform>
|
||||
</ProjectConfiguration>
|
||||
<ProjectConfiguration Include="Release|x64">
|
||||
<Configuration>Release</Configuration>
|
||||
<Platform>x64</Platform>
|
||||
</ProjectConfiguration>
|
||||
</ItemGroup>
|
||||
<ItemGroup>
|
||||
<ClCompile Include="src\mime.c" />
|
||||
<ClCompile Include="src\compat.c" />
|
||||
</ItemGroup>
|
||||
<PropertyGroup Label="Globals">
|
||||
<ProjectGuid>{128E8BD0-174A-48F0-8771-92B1E8D18713}</ProjectGuid>
|
||||
<Keyword>Win32Proj</Keyword>
|
||||
</PropertyGroup>
|
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
|
||||
<ConfigurationType>DynamicLibrary</ConfigurationType>
|
||||
<PlatformToolset>v141</PlatformToolset>
|
||||
<CharacterSet>MultiByte</CharacterSet>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
|
||||
<ConfigurationType>DynamicLibrary</ConfigurationType>
|
||||
<PlatformToolset>v141</PlatformToolset>
|
||||
<CharacterSet>MultiByte</CharacterSet>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
|
||||
<ConfigurationType>DynamicLibrary</ConfigurationType>
|
||||
<PlatformToolset>v141</PlatformToolset>
|
||||
<CharacterSet>MultiByte</CharacterSet>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
|
||||
<ConfigurationType>DynamicLibrary</ConfigurationType>
|
||||
<PlatformToolset>v141</PlatformToolset>
|
||||
<CharacterSet>MultiByte</CharacterSet>
|
||||
</PropertyGroup>
|
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
|
||||
<ImportGroup Label="ExtensionSettings">
|
||||
</ImportGroup>
|
||||
<ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="PropertySheets">
|
||||
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
|
||||
<Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
|
||||
<Import Project="Lua.props" />
|
||||
</ImportGroup>
|
||||
<ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
|
||||
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
|
||||
<Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
|
||||
<Import Project="Lua.props" />
|
||||
</ImportGroup>
|
||||
<ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="PropertySheets">
|
||||
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
|
||||
<Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
|
||||
<Import Project="Lua.props" />
|
||||
</ImportGroup>
|
||||
<ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="PropertySheets">
|
||||
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
|
||||
<Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
|
||||
<Import Project="Lua.props" />
|
||||
</ImportGroup>
|
||||
<PropertyGroup Label="UserMacros" />
|
||||
<PropertyGroup>
|
||||
<_ProjectFileVersion>11.0.50727.1</_ProjectFileVersion>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
|
||||
<OutDir>$(Configuration)\mime\</OutDir>
|
||||
<IntDir>$(Configuration)\</IntDir>
|
||||
<LinkIncremental>true</LinkIncremental>
|
||||
<TargetName>core</TargetName>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
|
||||
<LinkIncremental>true</LinkIncremental>
|
||||
<TargetName>core</TargetName>
|
||||
<OutDir>$(Platform)\$(Configuration)\mime\</OutDir>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
|
||||
<OutDir>$(Configuration)\mime\</OutDir>
|
||||
<IntDir>$(Configuration)\</IntDir>
|
||||
<LinkIncremental>false</LinkIncremental>
|
||||
<TargetName>core</TargetName>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
|
||||
<LinkIncremental>false</LinkIncremental>
|
||||
<OutDir>$(Platform)\$(Configuration)\mime\</OutDir>
|
||||
<TargetName>core</TargetName>
|
||||
</PropertyGroup>
|
||||
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
|
||||
<ClCompile>
|
||||
<Optimization>Disabled</Optimization>
|
||||
<AdditionalIncludeDirectories>$(LUAINC);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
|
||||
<PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;MIME_API=__declspec(dllexport);_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
|
||||
<MinimalRebuild>true</MinimalRebuild>
|
||||
<BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
|
||||
<RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
|
||||
<PrecompiledHeader />
|
||||
<WarningLevel>Level3</WarningLevel>
|
||||
<DebugInformationFormat>EditAndContinue</DebugInformationFormat>
|
||||
<ProgramDataBaseFileName>$(IntDir)$(TargetName)$(PlatformToolsetVersion).pdb</ProgramDataBaseFileName>
|
||||
</ClCompile>
|
||||
<Link>
|
||||
<AdditionalDependencies>$(LUALIBNAME);%(AdditionalDependencies)</AdditionalDependencies>
|
||||
<OutputFile>$(OutDir)$(TargetName).dll</OutputFile>
|
||||
<AdditionalLibraryDirectories>$(LUALIB);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
|
||||
<GenerateDebugInformation>true</GenerateDebugInformation>
|
||||
<ProgramDatabaseFile>$(OutDir)mime.pdb</ProgramDatabaseFile>
|
||||
<SubSystem>Windows</SubSystem>
|
||||
<RandomizedBaseAddress>false</RandomizedBaseAddress>
|
||||
<DataExecutionPrevention />
|
||||
<ImportLibrary>$(OutDir)$(TargetName).lib</ImportLibrary>
|
||||
<TargetMachine>MachineX86</TargetMachine>
|
||||
<ImageHasSafeExceptionHandlers>false</ImageHasSafeExceptionHandlers>
|
||||
</Link>
|
||||
</ItemDefinitionGroup>
|
||||
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
|
||||
<ClCompile>
|
||||
<Optimization>Disabled</Optimization>
|
||||
<AdditionalIncludeDirectories>$(LUAINC);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
|
||||
<PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;MIME_API=__declspec(dllexport);_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
|
||||
<BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
|
||||
<RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
|
||||
<PrecompiledHeader>
|
||||
</PrecompiledHeader>
|
||||
<WarningLevel>Level3</WarningLevel>
|
||||
<DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
|
||||
<ProgramDataBaseFileName>$(IntDir)$(TargetName)$(PlatformToolsetVersion).pdb</ProgramDataBaseFileName>
|
||||
</ClCompile>
|
||||
<Link>
|
||||
<AdditionalDependencies>$(LUALIBNAME);%(AdditionalDependencies)</AdditionalDependencies>
|
||||
<OutputFile>$(OutDir)$(TargetName).dll</OutputFile>
|
||||
<AdditionalLibraryDirectories>$(LUALIB);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
|
||||
<GenerateDebugInformation>true</GenerateDebugInformation>
|
||||
<ProgramDatabaseFile>$(OutDir)mime.pdb</ProgramDatabaseFile>
|
||||
<SubSystem>Windows</SubSystem>
|
||||
<RandomizedBaseAddress>false</RandomizedBaseAddress>
|
||||
<DataExecutionPrevention>
|
||||
</DataExecutionPrevention>
|
||||
<ImportLibrary>$(OutDir)$(TargetName).lib</ImportLibrary>
|
||||
</Link>
|
||||
</ItemDefinitionGroup>
|
||||
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
|
||||
<ClCompile>
|
||||
<AdditionalIncludeDirectories>$(LUAINC);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
|
||||
<PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;MIME_API=__declspec(dllexport);_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
|
||||
<RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
|
||||
<PrecompiledHeader />
|
||||
<WarningLevel>Level4</WarningLevel>
|
||||
<DebugInformationFormat />
|
||||
<ProgramDataBaseFileName>$(IntDir)$(TargetName)$(PlatformToolsetVersion).pdb</ProgramDataBaseFileName>
|
||||
</ClCompile>
|
||||
<Link>
|
||||
<AdditionalDependencies>$(LUALIBNAME);%(AdditionalDependencies)</AdditionalDependencies>
|
||||
<OutputFile>$(OutDir)$(TargetName).dll</OutputFile>
|
||||
<AdditionalLibraryDirectories>$(LUALIB);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
|
||||
<GenerateDebugInformation>true</GenerateDebugInformation>
|
||||
<SubSystem>Windows</SubSystem>
|
||||
<OptimizeReferences>true</OptimizeReferences>
|
||||
<EnableCOMDATFolding>true</EnableCOMDATFolding>
|
||||
<RandomizedBaseAddress>false</RandomizedBaseAddress>
|
||||
<DataExecutionPrevention />
|
||||
<ImportLibrary>$(OutDir)$(TargetName).lib</ImportLibrary>
|
||||
<TargetMachine>MachineX86</TargetMachine>
|
||||
</Link>
|
||||
</ItemDefinitionGroup>
|
||||
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
|
||||
<ClCompile>
|
||||
<AdditionalIncludeDirectories>$(LUAINC);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
|
||||
<PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;MIME_API=__declspec(dllexport);_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
|
||||
<RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
|
||||
<PrecompiledHeader>
|
||||
</PrecompiledHeader>
|
||||
<WarningLevel>Level4</WarningLevel>
|
||||
<DebugInformationFormat>
|
||||
</DebugInformationFormat>
|
||||
<ProgramDataBaseFileName>$(IntDir)$(TargetName)$(PlatformToolsetVersion).pdb</ProgramDataBaseFileName>
|
||||
</ClCompile>
|
||||
<Link>
|
||||
<AdditionalDependencies>$(LUALIBNAME);%(AdditionalDependencies)</AdditionalDependencies>
|
||||
<OutputFile>$(OutDir)$(TargetName).dll</OutputFile>
|
||||
<AdditionalLibraryDirectories>$(LUALIB);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
|
||||
<GenerateDebugInformation>true</GenerateDebugInformation>
|
||||
<SubSystem>Windows</SubSystem>
|
||||
<OptimizeReferences>true</OptimizeReferences>
|
||||
<EnableCOMDATFolding>true</EnableCOMDATFolding>
|
||||
<RandomizedBaseAddress>false</RandomizedBaseAddress>
|
||||
<DataExecutionPrevention>
|
||||
</DataExecutionPrevention>
|
||||
<ImportLibrary>$(OutDir)$(TargetName).lib</ImportLibrary>
|
||||
</Link>
|
||||
</ItemDefinitionGroup>
|
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
|
||||
<ImportGroup Label="ExtensionTargets">
|
||||
</ImportGroup>
|
||||
</Project>
|
||||
|
|
@ -0,0 +1 @@
|
|||
make PLAT=mingw LUAINC_mingw_base=/home/diego/build/mingw/include LUALIB_mingw_base=/home/diego/build/mingw/bin LUAPREFIX_mingw=/home/diego/build/mingw/bin DEBUG=DEBUG install-both
|
||||
|
|
@ -0,0 +1,134 @@
|
|||
package = "LuaSocket"
|
||||
version = "3.0.0-1"
|
||||
source = {
|
||||
url = "git+https://github.com/lunarmodules/luasocket.git",
|
||||
tag = "v3.0.0"
|
||||
}
|
||||
description = {
|
||||
summary = "Network support for the Lua language",
|
||||
detailed = [[
|
||||
LuaSocket is a Lua extension library composed of two parts: a set of C
|
||||
modules that provide support for the TCP and UDP transport layers, and a
|
||||
set of Lua modules that provide functions commonly needed by applications
|
||||
that deal with the Internet.
|
||||
]],
|
||||
homepage = "https://github.com/lunarmodules/luasocket",
|
||||
license = "MIT"
|
||||
}
|
||||
dependencies = {
|
||||
"lua >= 5.1"
|
||||
}
|
||||
|
||||
local function make_plat(plat)
|
||||
local defines = {
|
||||
unix = {
|
||||
"LUASOCKET_DEBUG"
|
||||
},
|
||||
macosx = {
|
||||
"LUASOCKET_DEBUG",
|
||||
"UNIX_HAS_SUN_LEN"
|
||||
},
|
||||
win32 = {
|
||||
"LUASOCKET_DEBUG",
|
||||
"NDEBUG"
|
||||
},
|
||||
mingw32 = {
|
||||
"LUASOCKET_DEBUG",
|
||||
"LUASOCKET_INET_PTON",
|
||||
"WINVER=0x0501"
|
||||
}
|
||||
}
|
||||
local modules = {
|
||||
["socket.core"] = {
|
||||
sources = {
|
||||
"src/luasocket.c"
|
||||
, "src/timeout.c"
|
||||
, "src/buffer.c"
|
||||
, "src/io.c"
|
||||
, "src/auxiliar.c"
|
||||
, "src/options.c"
|
||||
, "src/inet.c"
|
||||
, "src/except.c"
|
||||
, "src/select.c"
|
||||
, "src/tcp.c"
|
||||
, "src/udp.c"
|
||||
, "src/compat.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "/src"
|
||||
},
|
||||
["mime.core"] = {
|
||||
sources = { "src/mime.c", "src/compat.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "/src"
|
||||
},
|
||||
["socket.http"] = "src/http.lua",
|
||||
["socket.url"] = "src/url.lua",
|
||||
["socket.tp"] = "src/tp.lua",
|
||||
["socket.ftp"] = "src/ftp.lua",
|
||||
["socket.headers"] = "src/headers.lua",
|
||||
["socket.smtp"] = "src/smtp.lua",
|
||||
ltn12 = "src/ltn12.lua",
|
||||
socket = "src/socket.lua",
|
||||
mime = "src/mime.lua"
|
||||
}
|
||||
if plat == "unix"
|
||||
or plat == "macosx"
|
||||
or plat == "haiku"
|
||||
then
|
||||
modules["socket.core"].sources[#modules["socket.core"].sources+1] = "src/usocket.c"
|
||||
if plat == "haiku" then
|
||||
modules["socket.core"].libraries = {"network"}
|
||||
end
|
||||
modules["socket.unix"] = {
|
||||
sources = {
|
||||
"src/buffer.c"
|
||||
, "src/compat.c"
|
||||
, "src/auxiliar.c"
|
||||
, "src/options.c"
|
||||
, "src/timeout.c"
|
||||
, "src/io.c"
|
||||
, "src/usocket.c"
|
||||
, "src/unix.c"
|
||||
, "src/unixdgram.c"
|
||||
, "src/unixstream.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "/src"
|
||||
}
|
||||
modules["socket.serial"] = {
|
||||
sources = {
|
||||
"src/buffer.c"
|
||||
, "src/compat.c"
|
||||
, "src/auxiliar.c"
|
||||
, "src/options.c"
|
||||
, "src/timeout.c"
|
||||
, "src/io.c"
|
||||
, "src/usocket.c"
|
||||
, "src/serial.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "/src"
|
||||
}
|
||||
end
|
||||
if plat == "win32"
|
||||
or plat == "mingw32"
|
||||
then
|
||||
modules["socket.core"].sources[#modules["socket.core"].sources+1] = "src/wsocket.c"
|
||||
modules["socket.core"].libraries = { "ws2_32" }
|
||||
end
|
||||
return { modules = modules }
|
||||
end
|
||||
|
||||
build = {
|
||||
type = "builtin",
|
||||
platforms = {
|
||||
unix = make_plat("unix"),
|
||||
macosx = make_plat("macosx"),
|
||||
haiku = make_plat("haiku"),
|
||||
win32 = make_plat("win32"),
|
||||
mingw32 = make_plat("mingw32")
|
||||
},
|
||||
copy_directories = {
|
||||
"docs"
|
||||
, "samples"
|
||||
, "etc"
|
||||
, "test" }
|
||||
}
|
||||
|
|
@ -0,0 +1,108 @@
|
|||
package = "LuaSocket"
|
||||
version = "3.0rc1-2"
|
||||
source = {
|
||||
url = "https://github.com/diegonehab/luasocket/archive/v3.0-rc1.zip",
|
||||
dir = "luasocket-3.0-rc1",
|
||||
}
|
||||
description = {
|
||||
summary = "Network support for the Lua language",
|
||||
detailed = [[
|
||||
LuaSocket is a Lua extension library that is composed by two parts: a C core
|
||||
that provides support for the TCP and UDP transport layers, and a set of Lua
|
||||
modules that add support for functionality commonly needed by applications
|
||||
that deal with the Internet.
|
||||
]],
|
||||
homepage = "http://luaforge.net/projects/luasocket/",
|
||||
license = "MIT"
|
||||
}
|
||||
dependencies = {
|
||||
"lua >= 5.1"
|
||||
}
|
||||
|
||||
local function make_plat(plat)
|
||||
local defines = {
|
||||
unix = {
|
||||
"LUA_COMPAT_APIINTCASTS",
|
||||
"LUASOCKET_DEBUG",
|
||||
"LUASOCKET_API=__attribute__((visibility(\"default\")))",
|
||||
"UNIX_API=__attribute__((visibility(\"default\")))",
|
||||
"MIME_API=__attribute__((visibility(\"default\")))"
|
||||
},
|
||||
macosx = {
|
||||
"LUA_COMPAT_APIINTCASTS",
|
||||
"LUASOCKET_DEBUG",
|
||||
"UNIX_HAS_SUN_LEN",
|
||||
"LUASOCKET_API=__attribute__((visibility(\"default\")))",
|
||||
"UNIX_API=__attribute__((visibility(\"default\")))",
|
||||
"MIME_API=__attribute__((visibility(\"default\")))"
|
||||
},
|
||||
win32 = {
|
||||
"LUA_COMPAT_APIINTCASTS",
|
||||
"LUASOCKET_DEBUG",
|
||||
"NDEBUG",
|
||||
"LUASOCKET_API=__declspec(dllexport)",
|
||||
"MIME_API=__declspec(dllexport)"
|
||||
},
|
||||
mingw32 = {
|
||||
"LUA_COMPAT_APIINTCASTS",
|
||||
"LUASOCKET_DEBUG",
|
||||
"LUASOCKET_INET_PTON",
|
||||
"WINVER=0x0501",
|
||||
"LUASOCKET_API=__declspec(dllexport)",
|
||||
"MIME_API=__declspec(dllexport)"
|
||||
}
|
||||
}
|
||||
local modules = {
|
||||
["socket.core"] = {
|
||||
sources = { "src/luasocket.c", "src/timeout.c", "src/buffer.c", "src/io.c", "src/auxiliar.c",
|
||||
"src/options.c", "src/inet.c", "src/except.c", "src/select.c", "src/tcp.c", "src/udp.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "src"
|
||||
},
|
||||
["mime.core"] = {
|
||||
sources = { "src/mime.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "src"
|
||||
},
|
||||
["socket.http"] = "src/http.lua",
|
||||
["socket.url"] = "src/url.lua",
|
||||
["socket.tp"] = "src/tp.lua",
|
||||
["socket.ftp"] = "src/ftp.lua",
|
||||
["socket.headers"] = "src/headers.lua",
|
||||
["socket.smtp"] = "src/smtp.lua",
|
||||
ltn12 = "src/ltn12.lua",
|
||||
socket = "src/socket.lua",
|
||||
mime = "src/mime.lua"
|
||||
}
|
||||
if plat == "unix" or plat == "macosx" then
|
||||
modules["socket.core"].sources[#modules["socket.core"].sources+1] = "src/usocket.c"
|
||||
modules["socket.unix"] = {
|
||||
sources = { "src/buffer.c", "src/auxiliar.c", "src/options.c", "src/timeout.c", "src/io.c",
|
||||
"src/usocket.c", "src/unix.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "/src"
|
||||
}
|
||||
modules["socket.serial"] = {
|
||||
sources = { "src/buffer.c", "src/auxiliar.c", "src/options.c", "src/timeout.c",
|
||||
"src/io.c", "src/usocket.c", "src/serial.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "/src"
|
||||
}
|
||||
end
|
||||
if plat == "win32" or plat == "mingw32" then
|
||||
modules["socket.core"].sources[#modules["socket.core"].sources+1] = "src/wsocket.c"
|
||||
modules["socket.core"].libraries = { "ws2_32" }
|
||||
end
|
||||
return { modules = modules }
|
||||
end
|
||||
|
||||
build = {
|
||||
type = "builtin",
|
||||
platforms = {
|
||||
unix = make_plat("unix"),
|
||||
macosx = make_plat("macosx"),
|
||||
win32 = make_plat("win32"),
|
||||
mingw32 = make_plat("mingw32")
|
||||
},
|
||||
copy_directories = { "doc", "samples", "etc", "test" }
|
||||
}
|
||||
|
|
@ -0,0 +1,135 @@
|
|||
package = "LuaSocket"
|
||||
version = "3.1.0-1"
|
||||
source = {
|
||||
url = "git+https://github.com/lunarmodules/luasocket.git",
|
||||
tag = "v3.1.0"
|
||||
}
|
||||
description = {
|
||||
summary = "Network support for the Lua language",
|
||||
detailed = [[
|
||||
LuaSocket is a Lua extension library composed of two parts: a set of C
|
||||
modules that provide support for the TCP and UDP transport layers, and a
|
||||
set of Lua modules that provide functions commonly needed by applications
|
||||
that deal with the Internet.
|
||||
]],
|
||||
homepage = "https://github.com/lunarmodules/luasocket",
|
||||
license = "MIT"
|
||||
}
|
||||
dependencies = {
|
||||
"lua >= 5.1"
|
||||
}
|
||||
|
||||
local function make_plat(plat)
|
||||
local defines = {
|
||||
unix = {
|
||||
"LUASOCKET_DEBUG"
|
||||
},
|
||||
macosx = {
|
||||
"LUASOCKET_DEBUG",
|
||||
"UNIX_HAS_SUN_LEN"
|
||||
},
|
||||
win32 = {
|
||||
"LUASOCKET_DEBUG",
|
||||
"NDEBUG"
|
||||
},
|
||||
mingw32 = {
|
||||
"LUASOCKET_DEBUG",
|
||||
-- "LUASOCKET_INET_PTON",
|
||||
"WINVER=0x0501"
|
||||
}
|
||||
}
|
||||
local modules = {
|
||||
["socket.core"] = {
|
||||
sources = {
|
||||
"src/luasocket.c"
|
||||
, "src/timeout.c"
|
||||
, "src/buffer.c"
|
||||
, "src/io.c"
|
||||
, "src/auxiliar.c"
|
||||
, "src/options.c"
|
||||
, "src/inet.c"
|
||||
, "src/except.c"
|
||||
, "src/select.c"
|
||||
, "src/tcp.c"
|
||||
, "src/udp.c"
|
||||
, "src/compat.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "/src"
|
||||
},
|
||||
["mime.core"] = {
|
||||
sources = { "src/mime.c", "src/compat.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "/src"
|
||||
},
|
||||
["socket.http"] = "src/http.lua",
|
||||
["socket.url"] = "src/url.lua",
|
||||
["socket.tp"] = "src/tp.lua",
|
||||
["socket.ftp"] = "src/ftp.lua",
|
||||
["socket.headers"] = "src/headers.lua",
|
||||
["socket.smtp"] = "src/smtp.lua",
|
||||
ltn12 = "src/ltn12.lua",
|
||||
socket = "src/socket.lua",
|
||||
mime = "src/mime.lua"
|
||||
}
|
||||
if plat == "unix"
|
||||
or plat == "macosx"
|
||||
or plat == "haiku"
|
||||
then
|
||||
modules["socket.core"].sources[#modules["socket.core"].sources+1] = "src/usocket.c"
|
||||
if plat == "haiku" then
|
||||
modules["socket.core"].libraries = {"network"}
|
||||
end
|
||||
modules["socket.unix"] = {
|
||||
sources = {
|
||||
"src/buffer.c"
|
||||
, "src/compat.c"
|
||||
, "src/auxiliar.c"
|
||||
, "src/options.c"
|
||||
, "src/timeout.c"
|
||||
, "src/io.c"
|
||||
, "src/usocket.c"
|
||||
, "src/unix.c"
|
||||
, "src/unixdgram.c"
|
||||
, "src/unixstream.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "/src"
|
||||
}
|
||||
modules["socket.serial"] = {
|
||||
sources = {
|
||||
"src/buffer.c"
|
||||
, "src/compat.c"
|
||||
, "src/auxiliar.c"
|
||||
, "src/options.c"
|
||||
, "src/timeout.c"
|
||||
, "src/io.c"
|
||||
, "src/usocket.c"
|
||||
, "src/serial.c" },
|
||||
defines = defines[plat],
|
||||
incdir = "/src"
|
||||
}
|
||||
end
|
||||
if plat == "win32"
|
||||
or plat == "mingw32"
|
||||
then
|
||||
modules["socket.core"].sources[#modules["socket.core"].sources+1] = "src/wsocket.c"
|
||||
modules["socket.core"].libraries = { "ws2_32" }
|
||||
modules["socket.core"].libdirs = {}
|
||||
end
|
||||
return { modules = modules }
|
||||
end
|
||||
|
||||
build = {
|
||||
type = "builtin",
|
||||
platforms = {
|
||||
unix = make_plat("unix"),
|
||||
macosx = make_plat("macosx"),
|
||||
haiku = make_plat("haiku"),
|
||||
win32 = make_plat("win32"),
|
||||
mingw32 = make_plat("mingw32")
|
||||
},
|
||||
copy_directories = {
|
||||
"docs"
|
||||
, "samples"
|
||||
, "etc"
|
||||
, "test" }
|
||||
}
|
||||
|
|
@ -0,0 +1,50 @@
|
|||
This directory contains some sample programs using
|
||||
LuaSocket. This code is not supported.
|
||||
|
||||
listener.lua -- socket to stdout
|
||||
talker.lua -- stdin to socket
|
||||
|
||||
listener.lua and talker.lua are about the simplest
|
||||
applications you can write using LuaSocket. Run
|
||||
|
||||
'lua listener.lua' and 'lua talker.lua'
|
||||
|
||||
on different terminals. Whatever you type on talk.lua will
|
||||
be printed by listen.lua.
|
||||
|
||||
lpr.lua -- lpr client
|
||||
|
||||
This is a cool program written by David Burgess to print
|
||||
files using the Line Printer Daemon protocol, widely used in
|
||||
Unix machines. It uses the lp.lua implementation, in the
|
||||
etc directory. Just run 'lua lpr.lua <filename>
|
||||
queue=<printername>' and the file will print!
|
||||
|
||||
cddb.lua -- CDDB client
|
||||
|
||||
This is the first try on a simple CDDB client. Not really
|
||||
useful, but one day it might become a module.
|
||||
|
||||
daytimeclnt.lua -- day time client
|
||||
|
||||
Just run the program to retrieve the hour and date in
|
||||
readable form from any server running an UDP daytime daemon.
|
||||
|
||||
echoclnt.lua -- UDP echo client
|
||||
echosrvr.lua -- UDP echo server
|
||||
|
||||
These are a UDP echo client/server pair. They work with
|
||||
other client and servers as well.
|
||||
|
||||
tinyirc.lua -- irc like broadcast server
|
||||
|
||||
This is a simple server that waits simultaneously on two
|
||||
server sockets for telnet connections. Everything it
|
||||
receives from the telnet clients is broadcasted to every
|
||||
other connected client. It tests the select function and
|
||||
shows how to create a simple server whith LuaSocket. Just
|
||||
run tinyirc.lua and then open as many telnet connections
|
||||
as you want to ports 8080 and 8081.
|
||||
|
||||
Good luck,
|
||||
Diego.
|
||||
|
|
@ -0,0 +1,46 @@
|
|||
local socket = require("socket")
|
||||
local http = require("socket.http")
|
||||
|
||||
if not arg or not arg[1] or not arg[2] then
|
||||
print("luasocket cddb.lua <category> <disc-id> [<server>]")
|
||||
os.exit(1)
|
||||
end
|
||||
|
||||
local server = arg[3] or "http://freedb.freedb.org/~cddb/cddb.cgi"
|
||||
|
||||
function parse(body)
|
||||
local lines = string.gfind(body, "(.-)\r\n")
|
||||
local status = lines()
|
||||
local code, message = socket.skip(2, string.find(status, "(%d%d%d) (.*)"))
|
||||
if tonumber(code) ~= 210 then
|
||||
return nil, code, message
|
||||
end
|
||||
local data = {}
|
||||
for l in lines do
|
||||
local c = string.sub(l, 1, 1)
|
||||
if c ~= '#' and c ~= '.' then
|
||||
local key, value = socket.skip(2, string.find(l, "(.-)=(.*)"))
|
||||
value = string.gsub(value, "\\n", "\n")
|
||||
value = string.gsub(value, "\\\\", "\\")
|
||||
value = string.gsub(value, "\\t", "\t")
|
||||
data[key] = value
|
||||
end
|
||||
end
|
||||
return data, code, message
|
||||
end
|
||||
|
||||
local host = socket.dns.gethostname()
|
||||
local query = "%s?cmd=cddb+read+%s+%s&hello=LuaSocket+%s+LuaSocket+2.0&proto=6"
|
||||
local url = string.format(query, server, arg[1], arg[2], host)
|
||||
local body, headers, code = http.request(url)
|
||||
|
||||
if code == 200 then
|
||||
local data, code, error = parse(body)
|
||||
if not data then
|
||||
print(error or code)
|
||||
else
|
||||
for i,v in pairs(data) do
|
||||
io.write(i, ': ', v, '\n')
|
||||
end
|
||||
end
|
||||
else print(error) end
|
||||
|
|
@ -0,0 +1,22 @@
|
|||
-----------------------------------------------------------------------------
|
||||
-- UDP sample: daytime protocol client
|
||||
-- LuaSocket sample files
|
||||
-- Author: Diego Nehab
|
||||
-----------------------------------------------------------------------------
|
||||
local socket = require"socket"
|
||||
host = host or "127.0.0.1"
|
||||
port = port or 13
|
||||
if arg then
|
||||
host = arg[1] or host
|
||||
port = arg[2] or port
|
||||
end
|
||||
host = socket.dns.toip(host)
|
||||
udp = socket.udp()
|
||||
print("Using host '" ..host.. "' and port " ..port.. "...")
|
||||
udp:setpeername(host, port)
|
||||
udp:settimeout(3)
|
||||
sent, err = udp:send("anything")
|
||||
if err then print(err) os.exit() end
|
||||
dgram, err = udp:receive()
|
||||
if not dgram then print(err) os.exit() end
|
||||
io.write(dgram)
|
||||
|
|
@ -0,0 +1,23 @@
|
|||
-----------------------------------------------------------------------------
|
||||
-- UDP sample: echo protocol client
|
||||
-- LuaSocket sample files
|
||||
-- Author: Diego Nehab
|
||||
-----------------------------------------------------------------------------
|
||||
local socket = require("socket")
|
||||
host = host or "localhost"
|
||||
port = port or 7
|
||||
if arg then
|
||||
host = arg[1] or host
|
||||
port = arg[2] or port
|
||||
end
|
||||
host = socket.dns.toip(host)
|
||||
udp = assert(socket.udp())
|
||||
assert(udp:setpeername(host, port))
|
||||
print("Using remote host '" ..host.. "' and port " .. port .. "...")
|
||||
while 1 do
|
||||
line = io.read()
|
||||
if not line or line == "" then os.exit() end
|
||||
assert(udp:send(line))
|
||||
dgram = assert(udp:receive())
|
||||
print(dgram)
|
||||
end
|
||||
|
|
@ -0,0 +1,28 @@
|
|||
-----------------------------------------------------------------------------
|
||||
-- UDP sample: echo protocol server
|
||||
-- LuaSocket sample files
|
||||
-- Author: Diego Nehab
|
||||
-----------------------------------------------------------------------------
|
||||
local socket = require("socket")
|
||||
host = host or "127.0.0.1"
|
||||
port = port or 7
|
||||
if arg then
|
||||
host = arg[1] or host
|
||||
port = arg[2] or port
|
||||
end
|
||||
print("Binding to host '" ..host.. "' and port " ..port.. "...")
|
||||
udp = assert(socket.udp())
|
||||
assert(udp:setsockname(host, port))
|
||||
assert(udp:settimeout(5))
|
||||
ip, port = udp:getsockname()
|
||||
assert(ip, port)
|
||||
print("Waiting packets on " .. ip .. ":" .. port .. "...")
|
||||
while 1 do
|
||||
dgram, ip, port = udp:receivefrom()
|
||||
if dgram then
|
||||
print("Echoing '" .. dgram .. "' to " .. ip .. ":" .. port)
|
||||
udp:sendto(dgram, ip, port)
|
||||
else
|
||||
print(ip)
|
||||
end
|
||||
end
|
||||
|
|
@ -0,0 +1,25 @@
|
|||
-----------------------------------------------------------------------------
|
||||
-- TCP sample: Little program to dump lines received at a given port
|
||||
-- LuaSocket sample files
|
||||
-- Author: Diego Nehab
|
||||
-----------------------------------------------------------------------------
|
||||
local socket = require("socket")
|
||||
host = host or "*"
|
||||
port = port or 8080
|
||||
if arg then
|
||||
host = arg[1] or host
|
||||
port = arg[2] or port
|
||||
end
|
||||
print("Binding to host '" ..host.. "' and port " ..port.. "...")
|
||||
s = assert(socket.bind(host, port))
|
||||
i, p = s:getsockname()
|
||||
assert(i, p)
|
||||
print("Waiting connection from talker on " .. i .. ":" .. p .. "...")
|
||||
c = assert(s:accept())
|
||||
print("Connected. Here is the stuff:")
|
||||
l, e = c:receive()
|
||||
while not e do
|
||||
print(l)
|
||||
l, e = c:receive()
|
||||
end
|
||||
print(e)
|
||||
|
|
@ -0,0 +1,51 @@
|
|||
local lp = require("socket.lp")
|
||||
|
||||
local function usage()
|
||||
print('\nUsage: lua lpr.lua [filename] [keyword=val...]\n')
|
||||
print('Valid keywords are :')
|
||||
print(
|
||||
' host=remote host or IP address (default "localhost")\n' ..
|
||||
' queue=remote queue or printer name (default "printer")\n' ..
|
||||
' port=remote port number (default 515)\n' ..
|
||||
' user=sending user name\n' ..
|
||||
' format=["binary" | "text" | "ps" | "pr" | "fortran"] (default "binary")\n' ..
|
||||
' banner=true|false\n' ..
|
||||
' indent=number of columns to indent\n' ..
|
||||
' mail=email of address to notify when print is complete\n' ..
|
||||
' title=title to use for "pr" format\n' ..
|
||||
' width=width for "text" or "pr" formats\n' ..
|
||||
' class=\n' ..
|
||||
' job=\n' ..
|
||||
' name=\n' ..
|
||||
' localbind=true|false\n'
|
||||
)
|
||||
return nil
|
||||
end
|
||||
|
||||
if not arg or not arg[1] then
|
||||
return usage()
|
||||
end
|
||||
|
||||
do
|
||||
local opt = {}
|
||||
local pat = "[%s%c%p]*([%w]*)=([\"]?[%w%s_!@#$%%^&*()<>:;]+[\"]?.?)"
|
||||
for i = 2, #arg, 1 do
|
||||
string.gsub(arg[i], pat, function(name, value) opt[name] = value end)
|
||||
end
|
||||
if not arg[2] then
|
||||
return usage()
|
||||
end
|
||||
if arg[1] ~= "query" then
|
||||
opt.file = arg[1]
|
||||
r,e=lp.send(opt)
|
||||
io.stdout:write(tostring(r or e),'\n')
|
||||
else
|
||||
r,e=lp.query(opt)
|
||||
io.stdout:write(tostring(r or e), '\n')
|
||||
end
|
||||
end
|
||||
|
||||
-- trivial tests
|
||||
--lua lp.lua lp.lua queue=default host=localhost
|
||||
--lua lp.lua lp.lua queue=default host=localhost format=binary localbind=1
|
||||
--lua lp.lua query queue=default host=localhost
|
||||
|
|
@ -0,0 +1,18 @@
|
|||
local socket = require"socket"
|
||||
local group = "225.0.0.37"
|
||||
local port = 12345
|
||||
local c = assert(socket.udp())
|
||||
print(assert(c:setoption("reuseport", true)))
|
||||
print(assert(c:setsockname("*", port)))
|
||||
--print("loop:", c:getoption("ip-multicast-loop"))
|
||||
--print(assert(c:setoption("ip-multicast-loop", false)))
|
||||
--print("loop:", c:getoption("ip-multicast-loop"))
|
||||
--print("if:", c:getoption("ip-multicast-if"))
|
||||
--print(assert(c:setoption("ip-multicast-if", "127.0.0.1")))
|
||||
--print("if:", c:getoption("ip-multicast-if"))
|
||||
--print(assert(c:setoption("ip-multicast-if", "10.0.1.4")))
|
||||
--print("if:", c:getoption("ip-multicast-if"))
|
||||
print(assert(c:setoption("ip-add-membership", {multiaddr = group, interface = "*"})))
|
||||
while 1 do
|
||||
print(c:receivefrom())
|
||||
end
|
||||
|
|
@ -0,0 +1,20 @@
|
|||
local socket = require"socket"
|
||||
local group = "225.0.0.37"
|
||||
local port = 12345
|
||||
local c = assert(socket.udp())
|
||||
--print(assert(c:setoption("reuseport", true)))
|
||||
--print(assert(c:setsockname("*", port)))
|
||||
--print(assert(c:setoption("ip-multicast-loop", false)))
|
||||
--print(assert(c:setoption("ip-multicast-ttl", 4)))
|
||||
--print(assert(c:setoption("ip-multicast-if", "10.0.1.3")))
|
||||
--print(assert(c:setoption("ip-add-membership", {multiaddr = group, interface = "*"})))
|
||||
local i = 0
|
||||
while 1 do
|
||||
local message = string.format("hello all %d!", i)
|
||||
assert(c:sendto(message, group, port))
|
||||
print("sent " .. message)
|
||||
socket.sleep(1)
|
||||
c:settimeout(0.5)
|
||||
print(c:receivefrom())
|
||||
i = i + 1
|
||||
end
|
||||
|
|
@ -0,0 +1,20 @@
|
|||
-----------------------------------------------------------------------------
|
||||
-- TCP sample: Little program to send text lines to a given host/port
|
||||
-- LuaSocket sample files
|
||||
-- Author: Diego Nehab
|
||||
-----------------------------------------------------------------------------
|
||||
local socket = require("socket")
|
||||
host = host or "localhost"
|
||||
port = port or 8080
|
||||
if arg then
|
||||
host = arg[1] or host
|
||||
port = arg[2] or port
|
||||
end
|
||||
print("Attempting connection to host '" ..host.. "' and port " ..port.. "...")
|
||||
c = assert(socket.connect(host, port))
|
||||
print("Connected! Please type stuff (empty line to stop):")
|
||||
l = io.read()
|
||||
while l and l ~= "" and not e do
|
||||
assert(c:send(l .. "\n"))
|
||||
l = io.read()
|
||||
end
|
||||
|
|
@ -0,0 +1,89 @@
|
|||
-----------------------------------------------------------------------------
|
||||
-- Select sample: simple text line server
|
||||
-- LuaSocket sample files.
|
||||
-- Author: Diego Nehab
|
||||
-----------------------------------------------------------------------------
|
||||
local socket = require("socket")
|
||||
host = host or "*"
|
||||
port1 = port1 or 8080
|
||||
port2 = port2 or 8181
|
||||
if arg then
|
||||
host = arg[1] or host
|
||||
port1 = arg[2] or port1
|
||||
port2 = arg[3] or port2
|
||||
end
|
||||
|
||||
server1 = assert(socket.bind(host, port1))
|
||||
server2 = assert(socket.bind(host, port2))
|
||||
server1:settimeout(1) -- make sure we don't block in accept
|
||||
server2:settimeout(1)
|
||||
|
||||
io.write("Servers bound\n")
|
||||
|
||||
-- simple set implementation
|
||||
-- the select function doesn't care about what is passed to it as long as
|
||||
-- it behaves like a table
|
||||
-- creates a new set data structure
|
||||
function newset()
|
||||
local reverse = {}
|
||||
local set = {}
|
||||
return setmetatable(set, {__index = {
|
||||
insert = function(set, value)
|
||||
if not reverse[value] then
|
||||
table.insert(set, value)
|
||||
reverse[value] = #set
|
||||
end
|
||||
end,
|
||||
remove = function(set, value)
|
||||
local index = reverse[value]
|
||||
if index then
|
||||
reverse[value] = nil
|
||||
local top = table.remove(set)
|
||||
if top ~= value then
|
||||
reverse[top] = index
|
||||
set[index] = top
|
||||
end
|
||||
end
|
||||
end
|
||||
}})
|
||||
end
|
||||
|
||||
set = newset()
|
||||
|
||||
io.write("Inserting servers in set\n")
|
||||
set:insert(server1)
|
||||
set:insert(server2)
|
||||
|
||||
while 1 do
|
||||
local readable, _, error = socket.select(set, nil)
|
||||
for _, input in ipairs(readable) do
|
||||
-- is it a server socket?
|
||||
if input == server1 or input == server2 then
|
||||
io.write("Waiting for clients\n")
|
||||
local new = input:accept()
|
||||
if new then
|
||||
new:settimeout(1)
|
||||
io.write("Inserting client in set\n")
|
||||
set:insert(new)
|
||||
end
|
||||
-- it is a client socket
|
||||
else
|
||||
local line, error = input:receive()
|
||||
if error then
|
||||
input:close()
|
||||
io.write("Removing client from set\n")
|
||||
set:remove(input)
|
||||
else
|
||||
io.write("Broadcasting line '", line, "'\n")
|
||||
writable, error = socket.skip(1, socket.select(nil, set, 1))
|
||||
if not error then
|
||||
for __, output in ipairs(writable) do
|
||||
if output ~= input then
|
||||
output:send(line .. "\n")
|
||||
end
|
||||
end
|
||||
else io.write("No client ready to receive!!!\n") end
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
|
|
@ -0,0 +1,216 @@
|
|||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
|
||||
<ItemGroup Label="ProjectConfigurations">
|
||||
<ProjectConfiguration Include="Debug|Win32">
|
||||
<Configuration>Debug</Configuration>
|
||||
<Platform>Win32</Platform>
|
||||
</ProjectConfiguration>
|
||||
<ProjectConfiguration Include="Debug|x64">
|
||||
<Configuration>Debug</Configuration>
|
||||
<Platform>x64</Platform>
|
||||
</ProjectConfiguration>
|
||||
<ProjectConfiguration Include="Release|Win32">
|
||||
<Configuration>Release</Configuration>
|
||||
<Platform>Win32</Platform>
|
||||
</ProjectConfiguration>
|
||||
<ProjectConfiguration Include="Release|x64">
|
||||
<Configuration>Release</Configuration>
|
||||
<Platform>x64</Platform>
|
||||
</ProjectConfiguration>
|
||||
</ItemGroup>
|
||||
<ItemGroup>
|
||||
<ClCompile Include="src\auxiliar.c" />
|
||||
<ClCompile Include="src\buffer.c" />
|
||||
<ClCompile Include="src\compat.c" />
|
||||
<ClCompile Include="src\except.c" />
|
||||
<ClCompile Include="src\inet.c" />
|
||||
<ClCompile Include="src\io.c" />
|
||||
<ClCompile Include="src\luasocket.c" />
|
||||
<ClCompile Include="src\options.c" />
|
||||
<ClCompile Include="src\select.c" />
|
||||
<ClCompile Include="src\tcp.c" />
|
||||
<ClCompile Include="src\timeout.c" />
|
||||
<ClCompile Include="src\udp.c" />
|
||||
<ClCompile Include="src\wsocket.c" />
|
||||
</ItemGroup>
|
||||
<PropertyGroup Label="Globals">
|
||||
<ProjectGuid>{66E3CE14-884D-4AEA-9F20-15A0BEAF8C5A}</ProjectGuid>
|
||||
<Keyword>Win32Proj</Keyword>
|
||||
</PropertyGroup>
|
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
|
||||
<ConfigurationType>DynamicLibrary</ConfigurationType>
|
||||
<PlatformToolset>v141</PlatformToolset>
|
||||
<CharacterSet>MultiByte</CharacterSet>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
|
||||
<ConfigurationType>DynamicLibrary</ConfigurationType>
|
||||
<PlatformToolset>v141</PlatformToolset>
|
||||
<CharacterSet>MultiByte</CharacterSet>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
|
||||
<ConfigurationType>DynamicLibrary</ConfigurationType>
|
||||
<PlatformToolset>v141</PlatformToolset>
|
||||
<CharacterSet>MultiByte</CharacterSet>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
|
||||
<ConfigurationType>DynamicLibrary</ConfigurationType>
|
||||
<PlatformToolset>v141</PlatformToolset>
|
||||
<CharacterSet>MultiByte</CharacterSet>
|
||||
</PropertyGroup>
|
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
|
||||
<ImportGroup Label="ExtensionSettings">
|
||||
</ImportGroup>
|
||||
<ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="PropertySheets">
|
||||
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
|
||||
<Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
|
||||
<Import Project="Lua.props" />
|
||||
</ImportGroup>
|
||||
<ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
|
||||
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
|
||||
<Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
|
||||
<Import Project="Lua.props" />
|
||||
</ImportGroup>
|
||||
<ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="PropertySheets">
|
||||
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
|
||||
<Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
|
||||
<Import Project="Lua.props" />
|
||||
</ImportGroup>
|
||||
<ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="PropertySheets">
|
||||
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
|
||||
<Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
|
||||
<Import Project="Lua.props" />
|
||||
</ImportGroup>
|
||||
<PropertyGroup Label="UserMacros" />
|
||||
<PropertyGroup>
|
||||
<_ProjectFileVersion>11.0.50727.1</_ProjectFileVersion>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
|
||||
<OutDir>$(Configuration)\socket\</OutDir>
|
||||
<IntDir>$(Configuration)\</IntDir>
|
||||
<LinkIncremental>true</LinkIncremental>
|
||||
<TargetName>core</TargetName>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
|
||||
<LinkIncremental>true</LinkIncremental>
|
||||
<TargetName>core</TargetName>
|
||||
<OutDir>$(Platform)\$(Configuration)\socket\</OutDir>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
|
||||
<OutDir>$(Configuration)\socket\</OutDir>
|
||||
<IntDir>$(Configuration)\</IntDir>
|
||||
<LinkIncremental>false</LinkIncremental>
|
||||
<TargetName>core</TargetName>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
|
||||
<LinkIncremental>false</LinkIncremental>
|
||||
<OutDir>$(Platform)\$(Configuration)\socket\</OutDir>
|
||||
<TargetName>core</TargetName>
|
||||
</PropertyGroup>
|
||||
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
|
||||
<ClCompile>
|
||||
<Optimization>Disabled</Optimization>
|
||||
<AdditionalIncludeDirectories>$(LUAINC);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
|
||||
<PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;LUASOCKET_API=__declspec(dllexport);_CRT_SECURE_NO_WARNINGS;LUASOCKET_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
|
||||
<MinimalRebuild>true</MinimalRebuild>
|
||||
<BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
|
||||
<RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
|
||||
<PrecompiledHeader />
|
||||
<WarningLevel>Level3</WarningLevel>
|
||||
<DebugInformationFormat>EditAndContinue</DebugInformationFormat>
|
||||
<ProgramDataBaseFileName>$(IntDir)$(TargetName)$(PlatformToolsetVersion).pdb</ProgramDataBaseFileName>
|
||||
</ClCompile>
|
||||
<Link>
|
||||
<AdditionalDependencies>$(LUALIBNAME);ws2_32.lib;%(AdditionalDependencies)</AdditionalDependencies>
|
||||
<OutputFile>$(OutDir)$(TargetName).dll</OutputFile>
|
||||
<AdditionalLibraryDirectories>$(LUALIB);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
|
||||
<GenerateDebugInformation>true</GenerateDebugInformation>
|
||||
<ProgramDatabaseFile>$(OutDir)mime.pdb</ProgramDatabaseFile>
|
||||
<SubSystem>Windows</SubSystem>
|
||||
<RandomizedBaseAddress>false</RandomizedBaseAddress>
|
||||
<DataExecutionPrevention />
|
||||
<ImportLibrary>$(OutDir)$(TargetName).lib</ImportLibrary>
|
||||
<TargetMachine>MachineX86</TargetMachine>
|
||||
<ImageHasSafeExceptionHandlers>false</ImageHasSafeExceptionHandlers>
|
||||
</Link>
|
||||
</ItemDefinitionGroup>
|
||||
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
|
||||
<ClCompile>
|
||||
<Optimization>Disabled</Optimization>
|
||||
<AdditionalIncludeDirectories>$(LUAINC);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
|
||||
<PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;LUASOCKET_API=__declspec(dllexport);_CRT_SECURE_NO_WARNINGS;LUASOCKET_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
|
||||
<BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
|
||||
<RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
|
||||
<PrecompiledHeader>
|
||||
</PrecompiledHeader>
|
||||
<WarningLevel>Level3</WarningLevel>
|
||||
<DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
|
||||
<ProgramDataBaseFileName>$(IntDir)$(TargetName)$(PlatformToolsetVersion).pdb</ProgramDataBaseFileName>
|
||||
</ClCompile>
|
||||
<Link>
|
||||
<AdditionalDependencies>$(LUALIBNAME);ws2_32.lib;%(AdditionalDependencies)</AdditionalDependencies>
|
||||
<OutputFile>$(OutDir)$(TargetName).dll</OutputFile>
|
||||
<AdditionalLibraryDirectories>$(LUALIB);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
|
||||
<GenerateDebugInformation>true</GenerateDebugInformation>
|
||||
<ProgramDatabaseFile>$(OutDir)mime.pdb</ProgramDatabaseFile>
|
||||
<SubSystem>Windows</SubSystem>
|
||||
<RandomizedBaseAddress>false</RandomizedBaseAddress>
|
||||
<DataExecutionPrevention>
|
||||
</DataExecutionPrevention>
|
||||
<ImportLibrary>$(OutDir)$(TargetName).lib</ImportLibrary>
|
||||
</Link>
|
||||
</ItemDefinitionGroup>
|
||||
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
|
||||
<ClCompile>
|
||||
<AdditionalIncludeDirectories>$(LUAINC);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
|
||||
<PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;LUASOCKET_API=__declspec(dllexport);_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
|
||||
<RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
|
||||
<PrecompiledHeader />
|
||||
<WarningLevel>Level4</WarningLevel>
|
||||
<DebugInformationFormat />
|
||||
<ProgramDataBaseFileName>$(IntDir)$(TargetName)$(PlatformToolsetVersion).pdb</ProgramDataBaseFileName>
|
||||
</ClCompile>
|
||||
<Link>
|
||||
<AdditionalDependencies>$(LUALIBNAME);ws2_32.lib;%(AdditionalDependencies)</AdditionalDependencies>
|
||||
<OutputFile>$(OutDir)$(TargetName).dll</OutputFile>
|
||||
<AdditionalLibraryDirectories>$(LUALIB);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
|
||||
<GenerateDebugInformation>true</GenerateDebugInformation>
|
||||
<SubSystem>Windows</SubSystem>
|
||||
<OptimizeReferences>true</OptimizeReferences>
|
||||
<EnableCOMDATFolding>true</EnableCOMDATFolding>
|
||||
<RandomizedBaseAddress>false</RandomizedBaseAddress>
|
||||
<DataExecutionPrevention />
|
||||
<ImportLibrary>$(OutDir)$(TargetName).lib</ImportLibrary>
|
||||
<TargetMachine>MachineX86</TargetMachine>
|
||||
</Link>
|
||||
</ItemDefinitionGroup>
|
||||
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
|
||||
<ClCompile>
|
||||
<AdditionalIncludeDirectories>$(LUAINC);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
|
||||
<PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;LUASOCKET_API=__declspec(dllexport);_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
|
||||
<RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
|
||||
<PrecompiledHeader>
|
||||
</PrecompiledHeader>
|
||||
<WarningLevel>Level4</WarningLevel>
|
||||
<DebugInformationFormat>
|
||||
</DebugInformationFormat>
|
||||
<ProgramDataBaseFileName>$(IntDir)$(TargetName)$(PlatformToolsetVersion).pdb</ProgramDataBaseFileName>
|
||||
</ClCompile>
|
||||
<Link>
|
||||
<AdditionalDependencies>$(LUALIBNAME);ws2_32.lib;%(AdditionalDependencies)</AdditionalDependencies>
|
||||
<OutputFile>$(OutDir)$(TargetName).dll</OutputFile>
|
||||
<AdditionalLibraryDirectories>$(LUALIB);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
|
||||
<GenerateDebugInformation>true</GenerateDebugInformation>
|
||||
<SubSystem>Windows</SubSystem>
|
||||
<OptimizeReferences>true</OptimizeReferences>
|
||||
<EnableCOMDATFolding>true</EnableCOMDATFolding>
|
||||
<RandomizedBaseAddress>false</RandomizedBaseAddress>
|
||||
<DataExecutionPrevention>
|
||||
</DataExecutionPrevention>
|
||||
<ImportLibrary>$(OutDir)$(TargetName).lib</ImportLibrary>
|
||||
</Link>
|
||||
</ItemDefinitionGroup>
|
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
|
||||
<ImportGroup Label="ExtensionTargets">
|
||||
</ImportGroup>
|
||||
</Project>
|
||||
|
|
@ -0,0 +1,154 @@
|
|||
/*=========================================================================*\
|
||||
* Auxiliar routines for class hierarchy manipulation
|
||||
* LuaSocket toolkit
|
||||
\*=========================================================================*/
|
||||
#include "luasocket.h"
|
||||
#include "auxiliar.h"
|
||||
#include <string.h>
|
||||
#include <stdio.h>
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Initializes the module
|
||||
\*-------------------------------------------------------------------------*/
|
||||
int auxiliar_open(lua_State *L) {
|
||||
(void) L;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Creates a new class with given methods
|
||||
* Methods whose names start with __ are passed directly to the metatable.
|
||||
\*-------------------------------------------------------------------------*/
|
||||
void auxiliar_newclass(lua_State *L, const char *classname, luaL_Reg *func) {
|
||||
luaL_newmetatable(L, classname); /* mt */
|
||||
/* create __index table to place methods */
|
||||
lua_pushstring(L, "__index"); /* mt,"__index" */
|
||||
lua_newtable(L); /* mt,"__index",it */
|
||||
/* put class name into class metatable */
|
||||
lua_pushstring(L, "class"); /* mt,"__index",it,"class" */
|
||||
lua_pushstring(L, classname); /* mt,"__index",it,"class",classname */
|
||||
lua_rawset(L, -3); /* mt,"__index",it */
|
||||
/* pass all methods that start with _ to the metatable, and all others
|
||||
* to the index table */
|
||||
for (; func->name; func++) { /* mt,"__index",it */
|
||||
lua_pushstring(L, func->name);
|
||||
lua_pushcfunction(L, func->func);
|
||||
lua_rawset(L, func->name[0] == '_' ? -5: -3);
|
||||
}
|
||||
lua_rawset(L, -3); /* mt */
|
||||
lua_pop(L, 1);
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Prints the value of a class in a nice way
|
||||
\*-------------------------------------------------------------------------*/
|
||||
int auxiliar_tostring(lua_State *L) {
|
||||
char buf[32];
|
||||
if (!lua_getmetatable(L, 1)) goto error;
|
||||
lua_pushstring(L, "__index");
|
||||
lua_gettable(L, -2);
|
||||
if (!lua_istable(L, -1)) goto error;
|
||||
lua_pushstring(L, "class");
|
||||
lua_gettable(L, -2);
|
||||
if (!lua_isstring(L, -1)) goto error;
|
||||
sprintf(buf, "%p", lua_touserdata(L, 1));
|
||||
lua_pushfstring(L, "%s: %s", lua_tostring(L, -1), buf);
|
||||
return 1;
|
||||
error:
|
||||
lua_pushstring(L, "invalid object passed to 'auxiliar.c:__tostring'");
|
||||
lua_error(L);
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Insert class into group
|
||||
\*-------------------------------------------------------------------------*/
|
||||
void auxiliar_add2group(lua_State *L, const char *classname, const char *groupname) {
|
||||
luaL_getmetatable(L, classname);
|
||||
lua_pushstring(L, groupname);
|
||||
lua_pushboolean(L, 1);
|
||||
lua_rawset(L, -3);
|
||||
lua_pop(L, 1);
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Make sure argument is a boolean
|
||||
\*-------------------------------------------------------------------------*/
|
||||
int auxiliar_checkboolean(lua_State *L, int objidx) {
|
||||
if (!lua_isboolean(L, objidx))
|
||||
auxiliar_typeerror(L, objidx, lua_typename(L, LUA_TBOOLEAN));
|
||||
return lua_toboolean(L, objidx);
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Return userdata pointer if object belongs to a given class, abort with
|
||||
* error otherwise
|
||||
\*-------------------------------------------------------------------------*/
|
||||
void *auxiliar_checkclass(lua_State *L, const char *classname, int objidx) {
|
||||
void *data = auxiliar_getclassudata(L, classname, objidx);
|
||||
if (!data) {
|
||||
char msg[45];
|
||||
sprintf(msg, "%.35s expected", classname);
|
||||
luaL_argerror(L, objidx, msg);
|
||||
}
|
||||
return data;
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Return userdata pointer if object belongs to a given group, abort with
|
||||
* error otherwise
|
||||
\*-------------------------------------------------------------------------*/
|
||||
void *auxiliar_checkgroup(lua_State *L, const char *groupname, int objidx) {
|
||||
void *data = auxiliar_getgroupudata(L, groupname, objidx);
|
||||
if (!data) {
|
||||
char msg[45];
|
||||
sprintf(msg, "%.35s expected", groupname);
|
||||
luaL_argerror(L, objidx, msg);
|
||||
}
|
||||
return data;
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Set object class
|
||||
\*-------------------------------------------------------------------------*/
|
||||
void auxiliar_setclass(lua_State *L, const char *classname, int objidx) {
|
||||
luaL_getmetatable(L, classname);
|
||||
if (objidx < 0) objidx--;
|
||||
lua_setmetatable(L, objidx);
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Get a userdata pointer if object belongs to a given group. Return NULL
|
||||
* otherwise
|
||||
\*-------------------------------------------------------------------------*/
|
||||
void *auxiliar_getgroupudata(lua_State *L, const char *groupname, int objidx) {
|
||||
if (!lua_getmetatable(L, objidx))
|
||||
return NULL;
|
||||
lua_pushstring(L, groupname);
|
||||
lua_rawget(L, -2);
|
||||
if (lua_isnil(L, -1)) {
|
||||
lua_pop(L, 2);
|
||||
return NULL;
|
||||
} else {
|
||||
lua_pop(L, 2);
|
||||
return lua_touserdata(L, objidx);
|
||||
}
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Get a userdata pointer if object belongs to a given class. Return NULL
|
||||
* otherwise
|
||||
\*-------------------------------------------------------------------------*/
|
||||
void *auxiliar_getclassudata(lua_State *L, const char *classname, int objidx) {
|
||||
return luaL_testudata(L, objidx, classname);
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*\
|
||||
* Throws error when argument does not have correct type.
|
||||
* Used to be part of lauxlib in Lua 5.1, was dropped from 5.2.
|
||||
\*-------------------------------------------------------------------------*/
|
||||
int auxiliar_typeerror (lua_State *L, int narg, const char *tname) {
|
||||
const char *msg = lua_pushfstring(L, "%s expected, got %s", tname,
|
||||
luaL_typename(L, narg));
|
||||
return luaL_argerror(L, narg, msg);
|
||||
}
|
||||
|
|
@ -0,0 +1,54 @@
|
|||
#ifndef AUXILIAR_H
|
||||
#define AUXILIAR_H
|
||||
/*=========================================================================*\
|
||||
* Auxiliar routines for class hierarchy manipulation
|
||||
* LuaSocket toolkit (but completely independent of other LuaSocket modules)
|
||||
*
|
||||
* A LuaSocket class is a name associated with Lua metatables. A LuaSocket
|
||||
* group is a name associated with a class. A class can belong to any number
|
||||
* of groups. This module provides the functionality to:
|
||||
*
|
||||
* - create new classes
|
||||
* - add classes to groups
|
||||
* - set the class of objects
|
||||
* - check if an object belongs to a given class or group
|
||||
* - get the userdata associated to objects
|
||||
* - print objects in a pretty way
|
||||
*
|
||||
* LuaSocket class names follow the convention <module>{<class>}. Modules
|
||||
* can define any number of classes and groups. The module tcp.c, for
|
||||
* example, defines the classes tcp{master}, tcp{client} and tcp{server} and
|
||||
* the groups tcp{client,server} and tcp{any}. Module functions can then
|
||||
* perform type-checking on their arguments by either class or group.
|
||||
*
|
||||
* LuaSocket metatables define the __index metamethod as being a table. This
|
||||
* table has one field for each method supported by the class, and a field
|
||||
* "class" with the class name.
|
||||
*
|
||||
* The mapping from class name to the corresponding metatable and the
|
||||
* reverse mapping are done using lauxlib.
|
||||
\*=========================================================================*/
|
||||
|
||||
#include "luasocket.h"
|
||||
|
||||
#ifndef _WIN32
|
||||
#pragma GCC visibility push(hidden)
|
||||
#endif
|
||||
|
||||
int auxiliar_open(lua_State *L);
|
||||
void auxiliar_newclass(lua_State *L, const char *classname, luaL_Reg *func);
|
||||
int auxiliar_tostring(lua_State *L);
|
||||
void auxiliar_add2group(lua_State *L, const char *classname, const char *group);
|
||||
int auxiliar_checkboolean(lua_State *L, int objidx);
|
||||
void *auxiliar_checkclass(lua_State *L, const char *classname, int objidx);
|
||||
void *auxiliar_checkgroup(lua_State *L, const char *groupname, int objidx);
|
||||
void auxiliar_setclass(lua_State *L, const char *classname, int objidx);
|
||||
void *auxiliar_getgroupudata(lua_State *L, const char *groupname, int objidx);
|
||||
void *auxiliar_getclassudata(lua_State *L, const char *groupname, int objidx);
|
||||
int auxiliar_typeerror(lua_State *L, int narg, const char *tname);
|
||||
|
||||
#ifndef _WIN32
|
||||
#pragma GCC visibility pop
|
||||
#endif
|
||||
|
||||
#endif /* AUXILIAR_H */
|
||||
Some files were not shown because too many files have changed in this diff Show More
Loading…
Reference in New Issue