summaryrefslogtreecommitdiffstats
path: root/glib/dbus-gproxy.c
blob: 36f9724c748f908f1c543fc7f5706c8e60e1137c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
/* -*- mode: C; c-file-style: "gnu" -*- */
/* dbus-gcall.c convenience routines for calling methods, etc.
 *
 * Copyright (C) 2003  Red Hat, Inc.
 *
 * Licensed under the Academic Free License version 1.2
 * 
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
#include "dbus-gproxy.h"

/**
 * @addtogroup DBusGLibInternals
 *
 * @{
 */

struct DBusGProxy
{
  GStaticMutex lock;
  int refcount;
  DBusConnection *connection;
  char *service;
  char *interface;
  DBusObjectID object_id;
};

#define LOCK_PROXY(proxy)   (g_static_mutex_lock (&(proxy)->lock))
#define UNLOCK_PROXY(proxy) (g_static_mutex_unlock (&(proxy)->lock))

static DBusGProxy*
_dbus_gproxy_new (DBusConnection *connection)
{
  DBusGProxy *proxy;

  proxy = g_new0 (DBusGProxy, 1);
  
  proxy->refcount = 1;
  proxy->connection = connection;
  dbus_connection_ref (connection);

  g_static_mutex_init (&proxy->lock);
  
  return proxy;
}

/** @} End of DBusGLibInternals */

/** @addtogroup DBusGLib
 * @{
 */

/**
 * Creates a new proxy for a remote interface. Method calls and signal
 * connections over this proxy will go to the service owner; the
 * service owner is expected to support the given interface name. THE
 * SERVICE OWNER MAY CHANGE OVER TIME, for example between two
 * different method calls. If you need a fixed owner, you need to
 * request the current owner and bind a proxy to that rather than to
 * the generic service name; see dbus_gproxy_new_for_service_owner().
 *
 * A service-associated proxy only makes sense with a message bus,
 * not for app-to-app direct dbus connections.
 *
 * @param connection the connection to the remote bus or app
 * @param service_name name of the service on the message bus
 * @param interface_name name of the interface to call methods on
 * @returns new proxy object
 */
DBusGProxy*
dbus_gproxy_new_for_service (DBusConnection *connection,
                             const char     *service_name,
                             const char     *interface_name)
{
  DBusGProxy *proxy;

  g_return_val_if_fail (connection != NULL, NULL);
  g_return_val_if_fail (service_name != NULL, NULL);
  g_return_val_if_fail (interface_name != NULL, NULL);
  
  proxy = _dbus_gproxy_new (connection);

  proxy->service = g_strdup (service_name);
  proxy->interface = g_strdup (interface_name);

  return proxy;
}

/**
 * Increment reference count on proxy object.
 *
 * @todo use GAtomic to avoid locking
 * 
 * @param proxy the proxy
 */
void
dbus_gproxy_ref (DBusGProxy *proxy)
{
  g_return_if_fail (proxy != NULL);

  LOCK_PROXY (proxy);
  
  proxy->refcount += 1;

  UNLOCK_PROXY (proxy);
}

/**
 * Decrement reference count on proxy object.
 * 
 * @todo use GAtomic to avoid locking
 *
 * @param proxy the proxy
 */
void
dbus_gproxy_unref (DBusGProxy *proxy)
{
  g_return_if_fail (proxy != NULL);

  LOCK_PROXY (proxy);
  
  proxy->refcount -= 1;  
  
  if (proxy->refcount == 0)
    {
      UNLOCK_PROXY (proxy);
      
      dbus_connection_unref (proxy->connection);
      g_free (proxy->interface);
      g_free (proxy->service);
      g_static_mutex_free (&proxy->lock);
      g_free (proxy);
    }
  else
    {
      UNLOCK_PROXY (proxy);
    }
}

/**
 * Invokes a method on a remote interface. This function does not
 * block; instead it returns an opaque #DBusPendingCall object that
 * tracks the pending call.  The method call will not be sent over the
 * wire until the application returns to the main loop, or blocks in
 * dbus_connection_flush() to write out pending data.  The call will
 * be completed after a timeout, or when a reply is received.
 * To collect the results of the call (which may be an error,
 * or a reply), use dbus_gproxy_end_call().
 *
 * @param proxy a proxy for a remote interface
 * @param method the name of the method to invoke
 * @param first_arg_type type of the first argument
 *
 * @returns opaque pending call object
 * 
 */
DBusPendingCall*
dbus_gproxy_begin_call (DBusGProxy *proxy,
                        const char *method,
                        int         first_arg_type,
                        ...)
{
  g_return_val_if_fail (proxy != NULL, NULL);
  LOCK_PROXY (proxy);

  UNLOCK_PROXY (proxy);
}

/**
 * Collects the results of a method call. The method call was normally
 * initiated with dbus_gproxy_end_call(). This function will block if
 * the results haven't yet been received; use
 * dbus_pending_call_set_notify() to be notified asynchronously that a
 * pending call has been completed.
 *
 * If the call results in an error, the error is set as normal for
 * GError and the function returns #FALSE.
 *
 * Otherwise, the "out" parameters and return value of the
 * method are stored in the provided varargs list.
 * The list should be terminated with DBUS_TYPE_INVALID.
 *
 * @param proxy a proxy for a remote interface
 * @param pending the pending call from dbus_gproxy_begin_call()
 * @param error return location for an error
 * @param first_arg_type type of first "out" argument
 * @returns #FALSE if an error is set
 */
gboolean
dbus_gproxy_end_call (DBusGProxy          *proxy,
                      DBusPendingCall     *pending,
                      GError             **error,
                      int                  first_arg_type,
                      ...)
{
  g_return_val_if_fail (proxy != NULL, FALSE);
  LOCK_PROXY (proxy);

  UNLOCK_PROXY (proxy);
}

/**
 * Sends a message to the interface we're proxying for.  Does not
 * block or wait for a reply. The message is only actually written out
 * when you return to the main loop or block in
 * dbus_connection_flush().
 *
 * The message is modified to be addressed to the target interface.
 * That is, a destination service field or whatever is needed
 * will be added to the message.
 *
 * This function adds a reference to the message, so the caller
 * still owns its original reference.
 *
 * @todo fix for sending to interfaces and object IDs
 * 
 * @param proxy a proxy for a remote interface
 * @param message the message to address and send
 * @param client_serial return location for message's serial, or #NULL
 */
void
dbus_gproxy_send (DBusGProxy          *proxy,
                  DBusMessage         *message,
                  dbus_uint32_t       *client_serial)
{
  g_return_if_fail (proxy != NULL);
  LOCK_PROXY (proxy);
  
  if (proxy->service)
    {
      if (!dbus_message_set_destination (message, proxy->service))
        g_error ("Out of memory\n");
    }
  if (proxy->interface)
    {
      /* FIXME */
    }
  if (!dbus_object_id_is_null (&proxy->object_id))
    {
      /* FIXME */
    }

  if (!dbus_connection_send (proxy->connection, message, client_serial))
    g_error ("Out of memory\n");

  UNLOCK_PROXY (proxy);
}

/** @} End of DBusGLib public */

#ifdef DBUS_BUILD_TESTS

/**
 * @ingroup DBusGLibInternals
 * Unit test for GLib proxy functions
 * @returns #TRUE on success.
 */
dbus_bool_t
_dbus_gproxy_test (void)
{

  return TRUE;
}

#endif /* DBUS_BUILD_TESTS */