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;;;;
;;;; Copyright (C) 2012 Neil Jerram.
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU General Public License as
;;;; published by the Free Software Foundation; either version 3 of
;;;; the License, or (at your option) any later version.
;;;;
;;;; This library is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;;; General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU General Public License
;;;; along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
;;;; 02110-1301 USA
(define-module (glib dbus)
#:use-module (system foreign)
#:use-module (glib variant)
#:use-module (glib object)
#:use-module (rnrs bytevectors)
#:use-module (ice-9 format)
#:use-module (ossau trc)
#:use-module (oop goops)
#:export (dbus-interface
dbus-call
dbus-call-async
dbus-connect
dbus-interface-release))
(define gio (dynamic-link "libgio-2.0"))
(define g_dbus_proxy_new_for_bus_sync
(pointer->procedure '*
(dynamic-func "g_dbus_proxy_new_for_bus_sync" gio)
(list int ; bus type
int ; flags
'* ; interface info
'* ; bus name
'* ; object path
'* ; interface name
'* ; cancellable
'* ; error
)))
;; bus type
(define G_BUS_TYPE_SYSTEM 1)
(define G_BUS_TYPE_SESSION 2)
;; flags
(define G_DBUS_PROXY_FLAGS_NONE 0)
(define (dbus-interface bus-type service object-path interface-name)
(g_dbus_proxy_new_for_bus_sync (assq-ref `((system . ,G_BUS_TYPE_SYSTEM)
(session . ,G_BUS_TYPE_SESSION))
bus-type)
G_DBUS_PROXY_FLAGS_NONE
%null-pointer
(string->pointer service)
(string->pointer object-path)
(string->pointer interface-name)
%null-pointer
%null-pointer))
(define (dbus-interface-release interface)
(trc 'dbus-interface-release interface)
(let ((id (interface-signal-id interface)))
(trc 'id id)
(if id
(gobject-disconnect interface id)))
(set! (interface-signal-id interface) #f)
(set! (interface-signal-alist interface) #f)
(gobject-unref interface))
(define g_dbus_proxy_call_sync
(pointer->procedure '*
(dynamic-func "g_dbus_proxy_call_sync" gio)
(list '* ; proxy
'* ; method_name
'* ; parameters
int ; flags
int ; timeout_msec
'* ; cancellable
'* ; error
)))
(define g_dbus_proxy_call
(pointer->procedure void
(dynamic-func "g_dbus_proxy_call" gio)
(list '* ; proxy
'* ; method_name
'* ; parameters
int ; flags
int ; timeout_msec
'* ; cancellable
'* ; callback
'* ; user_data
)))
(define g_dbus_proxy_call_finish
(pointer->procedure '*
(dynamic-func "g_dbus_proxy_call_finish" gio)
(list '* ; proxy
'* ; res
'* ; error
)))
(define (dbus-call interface method . parameters)
(trc 'dbus-call interface method parameters)
(let ((timeout 10000))
(if (and (pair? parameters)
(eq? (car parameters) #:timeout))
(begin
(set! timeout (cadr parameters))
(set! parameters (cddr parameters))))
(let ((parms (scheme->variant parameters))
(errloc (uint-list->bytevector '(0)
(native-endianness)
(sizeof '*))))
(trc 'dbus-call-parms (variant->string parms) parms)
(let* ((result (g_dbus_proxy_call_sync interface
(string->pointer method)
parms
0
timeout
%null-pointer
(bytevector->pointer errloc)))
(gerror (make-pointer (car (bytevector->uint-list errloc
(native-endianness)
(sizeof '*))))))
(trc 'dbus-call-result (variant->string result) result)
(trc 'dbus-call-error gerror)
(or (null-pointer? gerror)
(let ((parsed-error (parse-c-struct gerror (list int32 int '*))))
(trc 'dbus-error-code (cadr parsed-error))
(trc 'dbus-error-msg (pointer->string (caddr parsed-error)))
(throw 'dbus-error
(cadr parsed-error)
(pointer->string (caddr parsed-error)))))
(variant->scheme result)))))
(define interface-callbacks (make-object-property))
(define (dbus-call-async completion-proc interface method . parameters)
(trc 'dbus-call-async interface method parameters)
(let* ((timeout 10000)
(callback (lambda (source_object res user_data)
(let* ((errloc (uint-list->bytevector '(0)
(native-endianness)
(sizeof '*)))
(result (g_dbus_proxy_call_finish interface
res
(bytevector->pointer errloc)))
(gerror (make-pointer (car (bytevector->uint-list errloc
(native-endianness)
(sizeof '*))))))
(trc 'dbus-call-async-result (variant->string result) result)
(trc 'dbus-call-async-error gerror)
(completion-proc (if (null-pointer? gerror)
(variant->scheme result)
#f)
(if (null-pointer? gerror)
#f
(let ((parsed-error (parse-c-struct gerror (list int32 int '*))))
(trc 'dbus-call-async-error-code (cadr parsed-error))
(trc 'dbus-call-async-error-msg (pointer->string (caddr parsed-error)))
(cons (cadr parsed-error)
(pointer->string (caddr parsed-error)))))))))
(ptr (procedure->pointer void
callback
(list '* '* '*))))
(set! (interface-callbacks interface)
(acons callback
ptr
(or (interface-callbacks interface)
'())))
(if (and (pair? parameters)
(eq? (car parameters) #:timeout))
(begin
(set! timeout (cadr parameters))
(set! parameters (cddr parameters))))
(let ((parms (scheme->variant parameters)))
(trc 'dbus-call-async-parms (variant->string parms) parms)
(g_dbus_proxy_call interface
(string->pointer method)
parms
0
timeout
%null-pointer
ptr
%null-pointer))))
(define interface-signal-id (make-object-property))
(define interface-signal-alist (make-object-property))
(define (dbus-connect interface dbus-signal proc)
(trc 'dbus-connect interface dbus-signal proc)
(or (interface-signal-id interface)
(let* ((g-signal-handler (lambda (signal parameters)
(trc 'dbus-signal interface signal parameters)
(let ((handler
(assoc-ref (interface-signal-alist interface)
signal)))
(if handler
(apply handler parameters)))))
(id (gobject-connect interface
"g-signal"
g-signal-handler)))
(trc "Set up g-signal handler" 'id id)
(set! (interface-signal-id interface) id)))
(set! (interface-signal-alist interface)
(assoc-set! (or (interface-signal-alist interface) '())
dbus-signal
proc)))
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