Removes lokimq::string_view (the type alias is still provided for
backwards compat, but now is always std::string_view).
Bump version (on dev branch) to 1.2.0
This class extends the basic ZMQ addresses with addresses that handle
parsing and generating of addresses with embedded curve pubkeys of
various forms, along with a QR-friendly address generator.
ConnectionIDs weren't comparing their routes, which meant that if
external code stored one in a map or set *all* incoming connections on
the same listener would be considered the same connection.
This fixes it by considering route for equality/hashing, and strips
route off internally where we need to map it to a socket.
When we hit the limit on the number of workers the proxy thread would
stop processing incoming messages, sending it into an infinite loop of
death. The check was supposed to use `active_workers()` rather than
`workers.size()`, but even that isn't quite right: we want to *always*
pull all incoming messages off and queue them internally since different
categories have their own queue sizes (and so we have to pull it off to
know whether we want to keep it -- if spare category queue room -- or
drop it).
This replaces the recognition of SN status to be checked per-command
invocation rather than on connection. As this breaks the API quite
substantially, though doesn't really affect the functionality, it seems
suitable to bump the minor version.
This requires a fundamental shift in how the calling application tells
LokiMQ about service nodes: rather than using a callback invoked on
connection, the application now has to call set_active_sns() (or the
more efficient update_active_sns(), if changes are readily available) to
update the list whenever it changes. LokiMQ then keeps this list
internally and uses it when determining whether to invoke.
This release also brings better request responses on errors: when a
request fails, the data argument will now be set to the failure reason,
one of:
- TIMEOUT
- UNKNOWNCOMMAND
- NOT_A_SERVICE_NODE (the remote isn't running in SN mode)
- FORBIDDEN (auth level denies the request)
- FORBIDDEN_SN (SN required and the remote doesn't see us as a SN)
Some of these (UNKNOWNCOMMAND, NOT_A_SERVICE_NODE, FORBIDDEN) were
already sent by remotes, but there was no connection to a request and so
they would log a warning, but the request would have to time out.
These errors (minus TIMEOUT, plus NO_REPLY_TAG signalling that a command
is a request but didn't include a reply tag) are also sent in response
to regular commands, but they simply result in a log warning showing the
error type and the command that caused the failure when received.
We really don't *ever* want send to block, no matter how it is called,
since the send is always in the proxy thread. This makes the actual
send call always non-blocking, and adds callbacks that we can invoke on
send failures: either on queue full errors (which might be recoverable),
or both full queue and hard failures (which are generally not
recoverable). These callbacks are both optional: they have to be passed
in using `send_option::queue_full` (if you just want queue full
notifies) or `send_option::queue_failure` (if you want queue full
notifies *and* other send exceptions).
For example:
lmq.request(conn, "some.method", callback, lokimq::request_timeout{5s});
will result in the callback being called with a failure if the response
doesn't arrive within 5s. (If it still arrives, but after the failure
callback, it gets dropped).
This removes two superfluous erases that occur during connection closing
(the proxy_close_connection just above them already removes the element
from `peers`), and also short-circuits the incoming message loop if our
pollitems becomes stale so that we don't try to use a closed connection.
It also fixes a bug in the outgoing connection index that was
decrementing the wrong connection indices, leading to failures when
trying to send on an existing connection after a disconnect.
Also adds a test case (which fails before the changes in this commit) to
test this.
The existing code was largely set up for SN-to-SN or client-to-SN
communications, where messages can always get to the right place because
we can always send by pubkey.
This doesn't work when we want general communications with a random
remote address.
This commit overhauls the way loki-mq handles communication in a few
important ways:
- Listening instances no longer pass bind addresses into the
constructor; instead they call `listen_curve()` or `listen_plain()`
before invoking `start()`.
- `listen_curve()` is equivalent to the existing bind support: it
listens on a socket and accepts encrypted handshaked connections from
anyone who already knows the server's public key.
- `listen_plain()` is all new: it sets up a plain text listening socket
over which random clients can connect and talk. End-points aren't
verified, and it isn't encrypted, but if you don't know who you are
talking to then encryption isn't doing anything anyway.
- Connecting to a remote now connections in CURVE encryption or NULL
(plain-text) encryption based on whether you provide a remote_pubkey.
For CURVE, the connection will fail if the pubkey does not match.
- `ConnectionID` objects are now returned when connecting to a remote
address; this object is then passed in to send/request/etc. to direct
the message. For SN communication, ConnectionID's can be created
implicitly from SN pubkey strings, so the existing interface of
`lmq.send(pubkey, ...)` will still work in most cases.
- A ConnectionID is now passed to the ConnectSuccess and ConnectFailure
callbacks. This can be used to uniquely identify which connection
succeeded or failed, and can determine whether the remote is a service
node (`.sn()`) and/or the pubkey (`.pubkey()`). (Obviously the service
node status is only available when the client can do service node
lookups, and the pubkey() is only non-empty for encrypted connections).
string_view isn't supposed to be implicitly convertible to std::string
and code would break compiling under c++17 (when our local string_view
is simply a std::string_view typedef).
This was meant to be an optimization but doesn't actually work because
we don't do a ZAP request at all when connecting inproc sockets, so the
metadata we need never gets set.
Remove it so a SN can still connect to itself.
Fix bug from quorumnet transition; quorumnet set the user id to
something like "S:abc..." or "C:abc..." to indicate SN or non-SN, but
now that gets carried in a separate message property but the +2 on the
copying position was still erroneously being used.
Batch jobs scheduled by the proxy thread itself were delayed to the next
poll timeout (because nothing ever gets sent on a socket). Add a
variable to bypass the next poll to handle this case.
This allows making RPC requests with a callback that gets called when
the response comes back. The is essentially a wrapper around doing it
yourself (i.e. by setting up a server-side "request" and client-side
"reply" command where "request" responds with a "reply" command), but
abstracted into lokimq itself as it is likely to be very useful when
integrating client/server connections rather than peer-to-peer
connections.
Jason Rhinelander