213 lines
7.3 KiB
Scheme
213 lines
7.3 KiB
Scheme
;;;; -*- mode: Scheme; indent-tabs-mode: nil; fill-column: 80; -*-
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;;;;
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;;;; Copyright © 2015 Rémi Delrue <asgeir@free.fr>
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;;;;
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;;;; This program is free software: you can redistribute it and/or modify
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;;;; it under the terms of the GNU General Public License as published by
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;;;; the Free Software Foundation, either version 3 of the License, or
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;;;; (at your option) any later version.
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;;;;
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;;;; This program is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;;; GNU General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU General Public License
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;;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu gnunet common)
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#:use-module (system foreign)
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#:use-module (rnrs base)
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#:use-module (rnrs bytevectors)
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#:use-module (ice-9 match)
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#:use-module (gnu gnunet binding-utils)
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#:use-module (gnu gnunet config)
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#:export (gnunet-ok
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gnunet-system-error
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gnunet-yes
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gnunet-no
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bool->int
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int->bool
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time-relative
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time-absolute
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time-rel
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current-time
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time-absolute->string
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time-relative->absolute
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ecdsa-public-key
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ecdsa-public-key?
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eddsa-public-key
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eddsa-signature
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hashcode
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define-foreign-definer
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gnunet-util-ffi
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gnunet-fs-ffi
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define-gnunet
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define-gnunet-fs
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define-gnunet-id
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setup-log
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%make-blob-pointer
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%malloc
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%free
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string->data-pointer))
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(define (generate n x)
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"Generates a list of length N which elements are X."
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(if (zero? n)
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'()
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(cons x (generate (1- n) x))))
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(define time-relative uint64)
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(define time-absolute uint64)
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(define %time-relative-forever #xffffffffffffffff) ; UINT64_MAX
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(define ecdsa-public-key (generate (/ 256 8 4) uint32))
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(define eddsa-public-key ecdsa-public-key)
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(define eddsa-signature (list eddsa-public-key
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eddsa-public-key))
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(define hashcode (list (generate 16 uint32)))
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(define (ecdsa-public-key? key)
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(and (string? key)
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(= (/ 258 8) (string-length key))))
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(define gnunet-ok 1)
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(define gnunet-system-error -1)
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(define gnunet-yes 1)
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(define gnunet-no 0)
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(define gnunet-util-ffi (dynamic-link %libgnunet-util))
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(define gnunet-fs-ffi (dynamic-link %libgnunet-fs))
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(define gnunet-identity-ffi (dynamic-link %libgnunet-identity))
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(define-syntax define-foreign-definer
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(syntax-rules ()
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((_ definer-name ffi-var)
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(define-syntax definer-name
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(syntax-rules (: ->)
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((_ func name : in -> out)
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(define func
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(pointer->procedure out (dynamic-func name ffi-var) in))))))))
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(define-foreign-definer define-gnunet gnunet-util-ffi)
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(define-foreign-definer define-gnunet-fs gnunet-fs-ffi)
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(define-foreign-definer define-gnunet-id gnunet-identity-ffi)
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(define-gnunet %time-absolute-get
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"GNUNET_TIME_absolute_get" : '() -> time-absolute)
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(define-gnunet %time-absolute->string
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"GNUNET_STRINGS_absolute_time_to_string" : (list time-absolute) -> '*)
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(define-gnunet %time-relative->absolute
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"GNUNET_TIME_relative_to_absolute" : (list time-relative) -> time-absolute)
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(define-gnunet %log-setup "GNUNET_log_setup" : '(* * *) -> int)
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(define-gnunet %xfree "GNUNET_xfree_" : (list '* '* int) -> void)
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(define-gnunet %xmalloc "GNUNET_xmalloc_" : (list size_t '* int) -> '*)
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;; this function is needed to convert ASCII public keys to a format GNUnet can
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;; understand.
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(define-gnunet %string-to-data
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"GNUNET_STRINGS_string_to_data" : (list '* size_t '* size_t) -> int)
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(define (bool->int x) (if x gnunet-yes gnunet-no))
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(define (int->bool x)
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(cond ((= gnunet-yes x) #t)
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((= gnunet-no x) #f)
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((= gnunet-system-error x) #:system-error)
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(else #:unknown)))
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(define log-level-alist
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(list (cons #:none (string->pointer "NONE"))
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(cons #:error (string->pointer "ERROR"))
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(cons #:warning (string->pointer "WARNING"))
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(cons #:info (string->pointer "INFO"))
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(cons #:debug (string->pointer "DEBUG"))
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(cons #:invalid (string->pointer "INVALID"))
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(cons #:bulk (string->pointer "BULK"))
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(cons #:unspecified (string->pointer "UNSPECIFIED"))))
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(define* (setup-log client-name log-level #:optional (log-file ""))
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"Setup GNUnet’s logging. CLIENT-NAME is the name of the program you’re
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writing, LOG-LEVEL is a keyword from (#:none #:error #:warning #:info #:debug
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#:invalid #:bulk), LOG-FILE is either a filename or #f for `stderr'."
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(define (log-level->pointer key)
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(or (assq-ref log-level-alist key)
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(assq-ref log-level-alist #:unspecified)))
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(%log-setup (string->pointer client-name)
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(log-level->pointer log-level)
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(string->pointer* log-file)))
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(define* (time-rel #:key (days 0) (hours 0) (minutes 0)
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(seconds 0) (milli 0) (micro 0) #:rest rest)
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(match rest
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((#:forever) %time-relative-forever)
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(_
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(let* ((hours* (+ (* days 24) hours))
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(minutes* (+ (* hours* 60) minutes))
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(seconds* (+ (* minutes* 60) seconds))
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(milli* (+ (* seconds* 1000) milli))
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(micro* (+ (* milli* 1000) micro)))
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(when (negative? micro*)
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(scm-error 'out-of-range "time-rel"
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"result (~a) is negative" (list micro*)
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(list hours minutes seconds milli micro)))
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(inexact->exact micro*)))))
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(define (current-time)
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"Get the current time as an absolute time."
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(%time-absolute-get))
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(define (time-absolute->string t)
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(pointer->string (%time-absolute->string t)))
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(define (time-relative->absolute t)
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"Convert a relative time to an absolute time in the future."
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(%time-relative->absolute t))
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(define %xfilename (string->pointer "guile"))
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(define (%free pointer)
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(assert (not (eq? %null-pointer pointer)))
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(%xfree pointer %xfilename 0))
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(define (%malloc size)
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"Allocates SIZE bytes on the C heap."
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;; note: if %xmalloc couldn’t do the allocation (out of memory), it calls
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;; abort(), and the whole guile process core dumps; at least, we’re assured
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;; %xmalloc will never return a null pointer…
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(%xmalloc size %xfilename 0))
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(define (%make-blob-pointer)
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(bytevector->pointer (make-bytevector (sizeof ptrdiff_t) 0)))
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;;+TODO: what about (getenv "GNUNET_ARGS") ?
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;;+TODO: skew-offset and skew-variance:
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;; GNUNET_TIME_set_offset(offset - variance)
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;;+TODO: what about defining the configuration entry ("arm" "CONFIG")?
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;; (define-syntax with-gnunet
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;; (syntax-rules ()
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;; ((_ (config-file-name) thunk)
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;; (let ((cfg-handle (load-configuration config-file-name)))
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(define (string->data-pointer str data-len)
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(let* ((%data (bytevector->pointer (make-bytevector data-len 0)))
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(ret (%string-to-data (string->pointer str) (string-length str)
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%data data-len)))
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(when (not (= gnunet-ok ret))
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(throw 'invalid-result "string->data-pointer" "%string-to-data"
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(list str data-len)))
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%data))
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