aboutsummaryrefslogtreecommitdiff
path: root/libdbusmenu-glib/client.c
blob: b0b1157fefbe59fa7957bde2d05faa316ace2570 (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
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
/*
A library to communicate a menu object set accross DBus and
track updates and maintain consistency.

Copyright 2009 Canonical Ltd.

Authors:
    Ted Gould <ted@canonical.com>

This program is free software: you can redistribute it and/or modify it 
under the terms of either or both of the following licenses:

1) the GNU Lesser General Public License version 3, as published by the 
Free Software Foundation; and/or
2) the GNU Lesser General Public License version 2.1, as published by 
the Free Software Foundation.

This program is distributed in the hope that it will be useful, but 
WITHOUT ANY WARRANTY; without even the implied warranties of 
MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR 
PURPOSE.  See the applicable version of the GNU Lesser General Public 
License for more details.

You should have received a copy of both the GNU Lesser General Public 
License version 3 and version 2.1 along with this program.  If not, see 
<http://www.gnu.org/licenses/>
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <libxml/parser.h>
#include <libxml/tree.h>

#include "client.h"
#include "dbusmenu-client.h"

/* Properties */
enum {
	PROP_0,
	PROP_DBUSOBJECT,
	PROP_DBUSNAME
};

/* Signals */
enum {
	LAYOUT_UPDATED,
	LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };

typedef struct _DbusmenuClientPrivate DbusmenuClientPrivate;
struct _DbusmenuClientPrivate
{
	DbusmenuMenuitem * root;
	
	gchar * dbus_object;
	gchar * dbus_name;

	DBusGConnection * session_bus;
	DBusGProxy * menuproxy;
	DBusGProxy * propproxy;
	DBusGProxyCall * layoutcall;
};

#define DBUSMENU_CLIENT_GET_PRIVATE(o) \
(G_TYPE_INSTANCE_GET_PRIVATE ((o), DBUSMENU_TYPE_CLIENT, DbusmenuClientPrivate))

/* GObject Stuff */
static void dbusmenu_client_class_init (DbusmenuClientClass *klass);
static void dbusmenu_client_init       (DbusmenuClient *self);
static void dbusmenu_client_dispose    (GObject *object);
static void dbusmenu_client_finalize   (GObject *object);
static void set_property (GObject * obj, guint id, const GValue * value, GParamSpec * pspec);
static void get_property (GObject * obj, guint id, GValue * value, GParamSpec * pspec);
/* Private Funcs */
static void layout_update (DBusGProxy * proxy, DbusmenuClient * client);
static void build_proxies (DbusmenuClient * client);
static guint parse_node_get_id (xmlNodePtr node);
static DbusmenuMenuitem * parse_layout_xml(xmlNodePtr node, DbusmenuMenuitem * item, DbusmenuMenuitem * parent);
static void parse_layout (DbusmenuClient * client, const gchar * layout);
static void update_layout_cb (DBusGProxy * proxy, DBusGProxyCall * call, void * data);
static void update_layout (DbusmenuClient * client);

/* Build a type */
G_DEFINE_TYPE (DbusmenuClient, dbusmenu_client, G_TYPE_OBJECT);

static void
dbusmenu_client_class_init (DbusmenuClientClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);

	g_type_class_add_private (klass, sizeof (DbusmenuClientPrivate));

	object_class->dispose = dbusmenu_client_dispose;
	object_class->finalize = dbusmenu_client_finalize;
	object_class->set_property = set_property;
	object_class->get_property = get_property;

	/**
		DbusmenuClient::layout-update:
		@arg0: The #DbusmenuClient object

		Tells that the layout has been updated and parsed by
		this object and is ready for grabbing by the calling
		application.
	*/
	signals[LAYOUT_UPDATED]  = g_signal_new(DBUSMENU_CLIENT_SIGNAL_LAYOUT_UPDATED,
	                                        G_TYPE_FROM_CLASS (klass),
	                                        G_SIGNAL_RUN_LAST,
	                                        G_STRUCT_OFFSET (DbusmenuClientClass, layout_updated),
	                                        NULL, NULL,
	                                        g_cclosure_marshal_VOID__VOID,
	                                        G_TYPE_NONE, 0, G_TYPE_NONE);

	g_object_class_install_property (object_class, PROP_DBUSOBJECT,
	                                 g_param_spec_string(DBUSMENU_CLIENT_PROP_DBUS_OBJECT, "DBus Object we represent",
	                                              "The Object on the client that we're getting our data from.",
	                                              NULL,
	                                              G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
	g_object_class_install_property (object_class, PROP_DBUSNAME,
	                                 g_param_spec_string(DBUSMENU_CLIENT_PROP_DBUS_NAME, "DBus Client we connect to",
	                                              "Name of the DBus client we're connecting to.",
	                                              NULL,
	                                              G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));

	return;
}

static void
dbusmenu_client_init (DbusmenuClient *self)
{
	DbusmenuClientPrivate * priv = DBUSMENU_CLIENT_GET_PRIVATE(self);

	priv->root = NULL;

	priv->dbus_object = NULL;
	priv->dbus_name = NULL;

	priv->session_bus = NULL;
	priv->menuproxy = NULL;
	priv->propproxy = NULL;
	priv->layoutcall = NULL;

	return;
}

static void
dbusmenu_client_dispose (GObject *object)
{
	DbusmenuClientPrivate * priv = DBUSMENU_CLIENT_GET_PRIVATE(object);

	if (priv->layoutcall != NULL) {
		dbus_g_proxy_cancel_call(priv->propproxy, priv->layoutcall);
		priv->layoutcall = NULL;
	}
	if (priv->menuproxy != NULL) {
		g_object_unref(G_OBJECT(priv->menuproxy));
		priv->menuproxy = NULL;
	}
	if (priv->propproxy != NULL) {
		g_object_unref(G_OBJECT(priv->propproxy));
		priv->propproxy = NULL;
	}
	priv->session_bus = NULL;

	G_OBJECT_CLASS (dbusmenu_client_parent_class)->dispose (object);
	return;
}

static void
dbusmenu_client_finalize (GObject *object)
{
	DbusmenuClientPrivate * priv = DBUSMENU_CLIENT_GET_PRIVATE(object);

	g_free(priv->dbus_name);
	g_free(priv->dbus_object);

	G_OBJECT_CLASS (dbusmenu_client_parent_class)->finalize (object);
	return;
}

static void
set_property (GObject * obj, guint id, const GValue * value, GParamSpec * pspec)
{
	DbusmenuClientPrivate * priv = DBUSMENU_CLIENT_GET_PRIVATE(obj);

	switch (id) {
	case PROP_DBUSNAME:
		priv->dbus_name = g_value_dup_string(value);
		if (priv->dbus_name != NULL && priv->dbus_object != NULL) {
			build_proxies(DBUSMENU_CLIENT(obj));
		}
		break;
	case PROP_DBUSOBJECT:
		priv->dbus_object = g_value_dup_string(value);
		if (priv->dbus_name != NULL && priv->dbus_object != NULL) {
			build_proxies(DBUSMENU_CLIENT(obj));
		}
		break;
	default:
		g_warning("Unknown property %d.", id);
		return;
	}

	return;
}

static void
get_property (GObject * obj, guint id, GValue * value, GParamSpec * pspec)
{
	DbusmenuClientPrivate * priv = DBUSMENU_CLIENT_GET_PRIVATE(obj);

	switch (id) {
	case PROP_DBUSNAME:
		g_value_set_string(value, priv->dbus_name);
		break;
	case PROP_DBUSOBJECT:
		g_value_set_string(value, priv->dbus_object);
		break;
	default:
		g_warning("Unknown property %d.", id);
		return;
	}

	return;
}

/* Internal funcs */

/* Annoying little wrapper to make the right function update */
static void
layout_update (DBusGProxy * proxy, DbusmenuClient * client)
{
	update_layout(client);
	return;
}

/* When we have a name and an object, build the two proxies and get the
   first version of the layout */
static void
build_proxies (DbusmenuClient * client)
{
	DbusmenuClientPrivate * priv = DBUSMENU_CLIENT_GET_PRIVATE(client);
	GError * error = NULL;

	g_return_if_fail(priv->dbus_object != NULL);
	g_return_if_fail(priv->dbus_name != NULL);

	priv->session_bus = dbus_g_bus_get(DBUS_BUS_SESSION, &error);
	if (error != NULL) {
		g_error("Unable to get session bus: %s", error->message);
		g_error_free(error);
		return;
	}

	priv->propproxy = dbus_g_proxy_new_for_name_owner(priv->session_bus,
	                                                  priv->dbus_name,
	                                                  priv->dbus_object,
	                                                  DBUS_INTERFACE_PROPERTIES,
	                                                  &error);
	if (error != NULL) {
		g_error("Unable to get property proxy for %s on %s: %s", priv->dbus_name, priv->dbus_object, error->message);
		g_error_free(error);
		return;
	}

	priv->menuproxy = dbus_g_proxy_new_for_name_owner(priv->session_bus,
	                                                  priv->dbus_name,
	                                                  priv->dbus_object,
	                                                  "org.freedesktop.dbusmenu",
	                                                  &error);
	if (error != NULL) {
		g_error("Unable to get dbusmenu proxy for %s on %s: %s", priv->dbus_name, priv->dbus_object, error->message);
		g_error_free(error);
		return;
	}

	dbus_g_proxy_add_signal(priv->menuproxy, "LayoutUpdate", G_TYPE_INVALID);
	dbus_g_proxy_connect_signal(priv->menuproxy, "LayoutUpdate", G_CALLBACK(layout_update), client, NULL);

	return;
}

/* Get the ID attribute of the node, parse it and
   return it.  Also we're checking to ensure the node
   is a 'menu' here. */
static guint
parse_node_get_id (xmlNodePtr node)
{
	if (g_strcmp0((gchar *)node->name, "menu") != 0) {
		/* This kills some nodes early */
		g_warning("XML Node is not 'menu' it is '%s'", node->name);
		return 0;
	}

	xmlAttrPtr attrib;
	for (attrib = node->properties; attrib != NULL; attrib = attrib->next) {
		if (g_strcmp0((gchar *)attrib->name, "id") == 0) {
			if (attrib->children != NULL) {
				guint id = (guint)g_ascii_strtoull((gchar *)attrib->children->content, NULL, 10);
				g_debug ("Found ID: %d", id);
				return id;
			}
			break;
		}
	}

	g_warning("Unable to find an ID on the node");
	return 0;
}

/* Parse recursively through the XML and make it into
   objects as need be */
static DbusmenuMenuitem *
parse_layout_xml(xmlNodePtr node, DbusmenuMenuitem * item, DbusmenuMenuitem * parent)
{
	guint id = parse_node_get_id(node);
	g_debug("Looking at node with id: %d", id);
	if (item == NULL || dbusmenu_menuitem_get_id(item) != id || id == 0) {
		if (item != NULL) {
			if (parent != NULL) {
				dbusmenu_menuitem_child_delete(parent, item);
			}
			g_object_unref(G_OBJECT(item));
		}

		if (id == 0) {
			g_warning("ID from XML file is zero");
			return NULL;
		}

		/* Build a new item */
		item = dbusmenu_menuitem_new_with_id(id);
	} 

	xmlNodePtr children;
	guint position;
	GList * oldchildren = dbusmenu_menuitem_take_children(item);

	for (children = node->children, position = 0; children != NULL; children = children->next, position++) {
		g_debug("Looking at child: %d", position);
		guint childid = parse_node_get_id(children);
		DbusmenuMenuitem * childmi = NULL;

		GList * childsearch = NULL;
		for (childsearch = oldchildren; childsearch != NULL; childsearch = g_list_next(childsearch)) {
			DbusmenuMenuitem * cs_mi = DBUSMENU_MENUITEM(childsearch->data);
			if (childid == dbusmenu_menuitem_get_id(cs_mi)) {
				oldchildren = g_list_remove(oldchildren, cs_mi);
				childmi = cs_mi;
				break;
			}
		}

		childmi = parse_layout_xml(children, childmi, item);
		dbusmenu_menuitem_child_add_position(item, childmi, position);
	}

	GList * oldchildleft = NULL;
	for (oldchildleft = oldchildren; oldchildleft != NULL; oldchildleft = g_list_next(oldchildleft)) {
		DbusmenuMenuitem * oldmi = DBUSMENU_MENUITEM(oldchildleft->data);
		g_object_unref(G_OBJECT(oldmi));
	}
	g_list_free(oldchildren);

	return item;
}

/* Take the layout passed to us over DBus and turn it into
   a set of beautiful objects */
static void
parse_layout (DbusmenuClient * client, const gchar * layout)
{
	DbusmenuClientPrivate * priv = DBUSMENU_CLIENT_GET_PRIVATE(client);

	xmlDocPtr xmldoc;

	xmldoc = xmlReadMemory(layout, g_utf8_strlen(layout, 16*1024), "dbusmenu.xml", NULL, 0);

	xmlNodePtr root = xmlDocGetRootElement(xmldoc);

	priv->root = parse_layout_xml(root, priv->root, NULL);
	if (priv->root == NULL) {
		g_warning("Unable to parse layout on client %s object %s: %s", priv->dbus_name, priv->dbus_object, layout);
	}

	xmlFreeDoc(xmldoc);
	return;
}

/* When the layout property returns, here's where we take care of that. */
static void
update_layout_cb (DBusGProxy * proxy, DBusGProxyCall * call, void * data)
{
	DbusmenuClient * client = DBUSMENU_CLIENT(data);
	DbusmenuClientPrivate * priv = DBUSMENU_CLIENT_GET_PRIVATE(client);

	GError * error = NULL;
	GValue value = {0};

	if (!dbus_g_proxy_end_call(proxy, call, &error, G_TYPE_VALUE, &value, G_TYPE_INVALID)) {
		g_warning("Getting layout failed on client %s object %s: %s", priv->dbus_name, priv->dbus_object, error->message);
		priv->layoutcall = NULL;
		g_error_free(error);
		return;
	}

	const gchar * xml = g_value_get_string(&value);
	g_debug("Got layout string: %s", xml);
	parse_layout(client, xml);

	priv->layoutcall = NULL;
	g_debug("Root is now: 0x%X", (unsigned int)priv->root);
	g_signal_emit(G_OBJECT(client), signals[LAYOUT_UPDATED], 0, TRUE);

	return;
}

/* Call the property on the server we're connected to and set it up to
   be async back to _update_layout_cb */
static void
update_layout (DbusmenuClient * client)
{
	DbusmenuClientPrivate * priv = DBUSMENU_CLIENT_GET_PRIVATE(client);

	if (priv->layoutcall != NULL) {
		return;
	}

	priv->layoutcall = dbus_g_proxy_begin_call (priv->propproxy,
	                                            "Get",
	                                            update_layout_cb,
	                                            client,
	                                            NULL,
	                                            G_TYPE_STRING, "org.freedesktop.dbusmenu",
	                                            G_TYPE_STRING, "layout",
	                                            G_TYPE_INVALID, G_TYPE_VALUE, G_TYPE_INVALID);

	return;
}

/* Public API */
/**
	dbusmenu_client_new:
	@name: The DBus name for the server to connect to
	@object: The object on the server to monitor

	This function creates a new client that connects to a specific
	server on DBus.  That server is at a specific location sharing
	a known object.  The interface is assumed by the code to be 
	the DBus menu interface.  The newly created client will start
	sending out events as it syncs up with the server.

	Return value: A brand new #DbusmenuClient
*/
DbusmenuClient *
dbusmenu_client_new (const gchar * name, const gchar * object)
{
	DbusmenuClient * self = g_object_new(DBUSMENU_TYPE_CLIENT,
	                                     DBUSMENU_CLIENT_PROP_DBUS_NAME, name,
	                                     DBUSMENU_CLIENT_PROP_DBUS_OBJECT, object,
	                                     NULL);
	update_layout(self);

	return self;
}

/**
	dbusmenu_client_get_root:
	@client: The #DbusmenuClient to get the root node from

	Grabs the root node for the specified client @client.  This
	function may block.  It will block if there is currently a
	call to update the layout, it will block on that layout 
	updated and then return the newly updated layout.  Chances
	are that this update is in the queue for the mainloop as
	it would have been requested some time ago, but in theory
	it could block longer.

	Return value: A #DbusmenuMenuitem representing the root of
		menu on the server.
*/
DbusmenuMenuitem *
dbusmenu_client_get_root (DbusmenuClient * client)
{
	g_return_val_if_fail(DBUSMENU_IS_CLIENT(client), NULL);

	DbusmenuClientPrivate * priv = DBUSMENU_CLIENT_GET_PRIVATE(client);

	if (priv->layoutcall != NULL) {
		/* Will end the current call and block on it's completion */
		update_layout_cb(priv->propproxy, priv->layoutcall, client);
	}

	return priv->root;
}