gio/gdbusactiongroup.c

   1 /*
   2  * Copyright © 2010 Codethink Limited
   3  * Copyright © 2011 Canonical Limited
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License as published
   7  * by the Free Software Foundation; either version 2 of the licence or (at
   8  * your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Authors: Ryan Lortie <desrt@desrt.ca>
  21  */
  22
  23 #include "config.h"
  24
  25 #include "gdbusactiongroup.h"
  26
  27 #include "gremoteactiongroup.h"
  28 #include "gdbusconnection.h"
  29 #include "gactiongroup.h"
  30
  31 /**
  32  * SECTION:gdbusactiongroup
  33  * @title: GDBusActionGroup
  34  * @short_description: A D-Bus GActionGroup implementation
  35  * @see_also: <link linkend="gio-GActionGroup-exporter">GActionGroup exporter</link>
  36  *
  37  * #GDBusActionGroup is an implementation of the #GActionGroup
  38  * interface that can be used as a proxy for an action group
  39  * that is exported over D-Bus with g_dbus_connection_export_action_group().
  40  */
  41
  42 struct _GDBusActionGroup
  43 {
  44   GObject parent_instance;
  45
  46   GDBusConnection *connection;
  47   gchar           *bus_name;
  48   gchar           *object_path;
  49   guint            subscription_id;
  50   GHashTable      *actions;
  51
  52   /* The 'strict' flag indicates that the non-existence of at least one
  53    * action has potentially been observed through the API.  This means
  54    * that we should always emit 'action-added' signals for all new
  55    * actions.
  56    *
  57    * The user can observe the non-existence of an action by listing the
  58    * actions or by performing a query (such as parameter type) on a
  59    * non-existent action.
  60    *
  61    * If the user has no way of knowing that a given action didn't
  62    * already exist then we can skip emitting 'action-added' signals
  63    * since they have no way of knowing that it wasn't there from the
  64    * start.
  65    */
  66   gboolean         strict;
  67 };
  68
  69 typedef GObjectClass GDBusActionGroupClass;
  70
  71 typedef struct
  72 {
  73   gchar        *name;
  74   GVariantType *parameter_type;
  75   gboolean      enabled;
  76   GVariant     *state;
  77 } ActionInfo;
  78
  79 static void
  80 action_info_free (gpointer user_data)
  81 {
  82   ActionInfo *info = user_data;
  83
  84   g_free (info->name);
  85
  86   if (info->state)
  87     g_variant_unref (info->state);
  88
  89   if (info->parameter_type)
  90     g_variant_type_free (info->parameter_type);
  91
  92   g_slice_free (ActionInfo, info);
  93 }
  94
  95 ActionInfo *
  96 action_info_new_from_iter (GVariantIter *iter)
  97 {
  98   const gchar *param_str;
  99   ActionInfo *info;
 100   gboolean enabled;
 101   GVariant *state;
 102   gchar *name;
 103
 104   if (!g_variant_iter_next (iter, "{s(b&g@av)}", &name,
 105                             &enabled, &param_str, &state))
 106     return NULL;
 107
 108   info = g_slice_new (ActionInfo);
 109   info->name = name;
 110   info->enabled = enabled;
 111
 112   if (g_variant_n_children (state))
 113     g_variant_get_child (state, 0, "v", &info->state);
 114   else
 115     info->state = NULL;
 116   g_variant_unref (state);
 117
 118   if (param_str[0])
 119     info->parameter_type = g_variant_type_copy ((GVariantType *) param_str);
 120   else
 121     info->parameter_type = NULL;
 122
 123   return info;
 124 }
 125
 126 static void g_dbus_action_group_remote_iface_init (GRemoteActionGroupInterface *iface);
 127 static void g_dbus_action_group_iface_init        (GActionGroupInterface       *iface);
 128 G_DEFINE_TYPE_WITH_CODE (GDBusActionGroup, g_dbus_action_group, G_TYPE_OBJECT,
 129   G_IMPLEMENT_INTERFACE (G_TYPE_ACTION_GROUP, g_dbus_action_group_iface_init)
 130   G_IMPLEMENT_INTERFACE (G_TYPE_REMOTE_ACTION_GROUP, g_dbus_action_group_remote_iface_init))
 131
 132 static void
 133 g_dbus_action_group_changed (GDBusConnection *connection,
 134                              const gchar     *sender,
 135                              const gchar     *object_path,
 136                              const gchar     *interface_name,
 137                              const gchar     *signal_name,
 138                              GVariant        *parameters,
 139                              gpointer         user_data)
 140 {
 141   GDBusActionGroup *group = user_data;
 142   GActionGroup *g_group = user_data;
 143
 144   /* make sure that we've been fully initialised */
 145   if (group->actions == NULL)
 146     return;
 147
 148   if (g_str_equal (signal_name, "Changed") &&
 149       g_variant_is_of_type (parameters, G_VARIANT_TYPE ("(asa{sb}a{sv}a{s(bgav)})")))
 150     {
 151       /* Removes */
 152       {
 153         GVariantIter *iter;
 154         const gchar *name;
 155
 156         g_variant_get_child (parameters, 0, "as", &iter);
 157         while (g_variant_iter_next (iter, "&s", &name))
 158           {
 159             if (g_hash_table_lookup (group->actions, name))
 160               {
 161                 g_hash_table_remove (group->actions, name);
 162                 g_action_group_action_removed (g_group, name);
 163               }
 164           }
 165         g_variant_iter_free (iter);
 166       }
 167
 168       /* Enable changes */
 169       {
 170         GVariantIter *iter;
 171         const gchar *name;
 172         gboolean enabled;
 173
 174         g_variant_get_child (parameters, 1, "a{sb}", &iter);
 175         while (g_variant_iter_next (iter, "{&sb}", &name, &enabled))
 176           {
 177             ActionInfo *info;
 178
 179             info = g_hash_table_lookup (group->actions, name);
 180
 181             if (info && info->enabled != enabled)
 182               {
 183                 info->enabled = enabled;
 184                 g_action_group_action_enabled_changed (g_group, name, enabled);
 185               }
 186           }
 187         g_variant_iter_free (iter);
 188       }
 189
 190       /* State changes */
 191       {
 192         GVariantIter *iter;
 193         const gchar *name;
 194         GVariant *state;
 195
 196         g_variant_get_child (parameters, 2, "a{sv}", &iter);
 197         while (g_variant_iter_next (iter, "{&sv}", &name, &state))
 198           {
 199             ActionInfo *info;
 200
 201             info = g_hash_table_lookup (group->actions, name);
 202
 203             if (info && info->state && !g_variant_equal (state, info->state) &&
 204                 g_variant_is_of_type (state, g_variant_get_type (info->state)))
 205               {
 206                 g_variant_unref (info->state);
 207                 info->state = g_variant_ref (state);
 208
 209                 g_action_group_action_state_changed (g_group, name, state);
 210               }
 211
 212             g_variant_unref (state);
 213           }
 214         g_variant_iter_free (iter);
 215       }
 216
 217       /* Additions */
 218       {
 219         GVariantIter *iter;
 220         ActionInfo *info;
 221
 222         g_variant_get_child (parameters, 3, "a{s(bgav)}", &iter);
 223         while ((info = action_info_new_from_iter (iter)))
 224           {
 225             if (!g_hash_table_lookup (group->actions, info->name))
 226               {
 227                 g_hash_table_insert (group->actions, info->name, info);
 228
 229                 if (group->strict)
 230                   g_action_group_action_added (g_group, info->name);
 231               }
 232             else
 233               action_info_free (info);
 234           }
 235         g_variant_iter_free (iter);
 236       }
 237     }
 238 }
 239
 240
 241 static void
 242 g_dbus_action_group_describe_all_done (GObject      *source,
 243                                        GAsyncResult *result,
 244                                        gpointer      user_data)
 245 {
 246   GDBusActionGroup *group= user_data;
 247   GVariant *reply;
 248
 249   g_assert (group->actions == NULL);
 250   group->actions = g_hash_table_new_full (g_str_hash, g_str_equal, NULL, action_info_free);
 251
 252   g_assert (group->connection == (gpointer) source);
 253   reply = g_dbus_connection_call_finish (group->connection, result, NULL);
 254
 255   if (reply != NULL)
 256     {
 257       GVariantIter *iter;
 258       ActionInfo *action;
 259
 260       g_variant_get (reply, "(a{s(bgav)})", &iter);
 261       while ((action = action_info_new_from_iter (iter)))
 262         {
 263           g_hash_table_insert (group->actions, action->name, action);
 264
 265           if (group->strict)
 266             g_action_group_action_added (G_ACTION_GROUP (group), action->name);
 267         }
 268       g_variant_iter_free (iter);
 269       g_variant_unref (reply);
 270     }
 271 }
 272
 273
 274 static void
 275 g_dbus_action_group_async_init (GDBusActionGroup *group)
 276 {
 277   if (group->subscription_id != 0)
 278     return;
 279
 280   group->subscription_id =
 281     g_dbus_connection_signal_subscribe (group->connection, group->bus_name, "org.gtk.Actions", "Changed", group->object_path,
 282                                         NULL, G_DBUS_SIGNAL_FLAGS_NONE, g_dbus_action_group_changed, group, NULL);
 283
 284   g_dbus_connection_call (group->connection, group->bus_name, group->object_path, "org.gtk.Actions", "DescribeAll", NULL,
 285                           G_VARIANT_TYPE ("(a{s(bgav)})"), G_DBUS_CALL_FLAGS_NONE, -1, NULL,
 286                           g_dbus_action_group_describe_all_done, group);
 287 }
 288
 289 static gchar **
 290 g_dbus_action_group_list_actions (GActionGroup *g_group)
 291 {
 292   GDBusActionGroup *group = G_DBUS_ACTION_GROUP (g_group);
 293   gchar **keys;
 294
 295   if (group->actions != NULL)
 296     {
 297       GHashTableIter iter;
 298       gint n, i = 0;
 299       gpointer key;
 300
 301       n = g_hash_table_size (group->actions);
 302       keys = g_new (gchar *, n + 1);
 303
 304       g_hash_table_iter_init (&iter, group->actions);
 305       while (g_hash_table_iter_next (&iter, &key, NULL))
 306         keys[i++] = g_strdup (key);
 307       g_assert_cmpint (i, ==, n);
 308       keys[n] = NULL;
 309     }
 310   else
 311     {
 312       g_dbus_action_group_async_init (group);
 313       keys = g_new0 (gchar *, 1);
 314     }
 315
 316   group->strict = TRUE;
 317
 318   return keys;
 319 }
 320
 321 static gboolean
 322 g_dbus_action_group_query_action (GActionGroup        *g_group,
 323                                   const gchar         *action_name,
 324                                   gboolean            *enabled,
 325                                   const GVariantType **parameter_type,
 326                                   const GVariantType **state_type,
 327                                   GVariant           **state_hint,
 328                                   GVariant           **state)
 329 {
 330   GDBusActionGroup *group = G_DBUS_ACTION_GROUP (g_group);
 331   ActionInfo *info;
 332
 333   if (group->actions != NULL)
 334     {
 335       info = g_hash_table_lookup (group->actions, action_name);
 336
 337       if (info == NULL)
 338         {
 339           group->strict = TRUE;
 340           return FALSE;
 341         }
 342
 343       if (enabled)
 344         *enabled = info->enabled;
 345
 346       if (parameter_type)
 347         *parameter_type = info->parameter_type;
 348
 349       if (state_type)
 350         *state_type = info->state ? g_variant_get_type (info->state) : NULL;
 351
 352       if (state_hint)
 353         *state_hint = NULL;
 354
 355       if (state)
 356         *state = info->state ? g_variant_ref (info->state) : NULL;
 357
 358       return TRUE;
 359     }
 360   else
 361     {
 362       g_dbus_action_group_async_init (group);
 363
 364       return FALSE;
 365     }
 366 }
 367
 368 static void
 369 g_dbus_action_group_activate_action_full (GRemoteActionGroup *remote,
 370                                           const gchar        *action_name,
 371                                           GVariant           *parameter,
 372                                           GVariant           *platform_data)
 373 {
 374   GDBusActionGroup *group = G_DBUS_ACTION_GROUP (remote);
 375   GVariantBuilder builder;
 376
 377   g_variant_builder_init (&builder, G_VARIANT_TYPE ("av"));
 378
 379   if (parameter)
 380     g_variant_builder_add (&builder, "v", parameter);
 381
 382   g_dbus_connection_call (group->connection, group->bus_name, group->object_path, "org.gtk.Actions", "Activate",
 383                           g_variant_new ("(sav@a{sv})", action_name, &builder, platform_data),
 384                           NULL, G_DBUS_CALL_FLAGS_NONE, -1, NULL, NULL, NULL);
 385 }
 386
 387 static void
 388 g_dbus_action_group_change_action_state_full (GRemoteActionGroup *remote,
 389                                               const gchar        *action_name,
 390                                               GVariant           *value,
 391                                               GVariant           *platform_data)
 392 {
 393   GDBusActionGroup *group = G_DBUS_ACTION_GROUP (remote);
 394
 395   g_dbus_connection_call (group->connection, group->bus_name, group->object_path, "org.gtk.Actions", "SetState",
 396                           g_variant_new ("(sv@a{sv})", action_name, value, platform_data),
 397                           NULL, G_DBUS_CALL_FLAGS_NONE, -1, NULL, NULL, NULL);
 398 }
 399
 400 static void
 401 g_dbus_action_group_change_state (GActionGroup *group,
 402                                   const gchar  *action_name,
 403                                   GVariant     *value)
 404 {
 405   g_dbus_action_group_change_action_state_full (G_REMOTE_ACTION_GROUP (group),
 406                                                 action_name, value, g_variant_new ("a{sv}", NULL));
 407 }
 408
 409 static void
 410 g_dbus_action_group_activate (GActionGroup *group,
 411                               const gchar  *action_name,
 412                               GVariant     *parameter)
 413 {
 414   g_dbus_action_group_activate_action_full (G_REMOTE_ACTION_GROUP (group),
 415                                             action_name, parameter, g_variant_new ("a{sv}", NULL));
 416 }
 417
 418 static void
 419 g_dbus_action_group_finalize (GObject *object)
 420 {
 421   GDBusActionGroup *group = G_DBUS_ACTION_GROUP (object);
 422
 423   if (group->subscription_id)
 424     g_dbus_connection_signal_unsubscribe (group->connection, group->subscription_id);
 425
 426   if (group->actions)
 427     g_hash_table_unref (group->actions);
 428
 429   g_object_unref (group->connection);
 430   g_free (group->object_path);
 431   g_free (group->bus_name);
 432
 433   G_OBJECT_CLASS (g_dbus_action_group_parent_class)
 434     ->finalize (object);
 435 }
 436
 437 static void
 438 g_dbus_action_group_init (GDBusActionGroup *group)
 439 {
 440 }
 441
 442 static void
 443 g_dbus_action_group_class_init (GDBusActionGroupClass *class)
 444 {
 445   GObjectClass *object_class = G_OBJECT_CLASS (class);
 446
 447   object_class->finalize = g_dbus_action_group_finalize;
 448 }
 449
 450 static void
 451 g_dbus_action_group_remote_iface_init (GRemoteActionGroupInterface *iface)
 452 {
 453   iface->activate_action_full = g_dbus_action_group_activate_action_full;
 454   iface->change_action_state_full = g_dbus_action_group_change_action_state_full;
 455 }
 456
 457 static void
 458 g_dbus_action_group_iface_init (GActionGroupInterface *iface)
 459 {
 460   iface->list_actions = g_dbus_action_group_list_actions;
 461   iface->query_action = g_dbus_action_group_query_action;
 462   iface->change_action_state = g_dbus_action_group_change_state;
 463   iface->activate_action = g_dbus_action_group_activate;
 464 }
 465
 466 /**
 467  * g_dbus_action_group_get:
 468  * @connection: A #GDBusConnection
 469  * @bus_name: the bus name which exports the action group
 470  * @object_path: the object path at which the action group is exported
 471  *
 472  * Obtains a #GDBusActionGroup for the action group which is exported at
 473  * the given @bus_name and @object_path.
 474  *
 475  * The thread default main context is taken at the time of this call.
 476  * All signals on the menu model (and any linked models) are reported
 477  * with respect to this context.  All calls on the returned menu model
 478  * (and linked models) must also originate from this same context, with
 479  * the thread default main context unchanged.
 480  *
 481  * This call is non-blocking.  The returned action group may or may not
 482  * already be filled in.  The correct thing to do is connect the signals
 483  * for the action group to monitor for changes and then to call
 484  * g_action_group_list_actions() to get the initial list.
 485  *
 486  * Returns: (transfer full): a #GDBusActionGroup
 487  *
 488  * Since: 2.32
 489  */
 490 GDBusActionGroup *
 491 g_dbus_action_group_get (GDBusConnection *connection,
 492                          const gchar     *bus_name,
 493                          const gchar     *object_path)
 494 {
 495   GDBusActionGroup *group;
 496
 497   group = g_object_new (G_TYPE_DBUS_ACTION_GROUP, NULL);
 498   group->connection = g_object_ref (connection);
 499   group->bus_name = g_strdup (bus_name);
 500   group->object_path = g_strdup (object_path);
 501
 502   return group;
 503 }
 504
 505 G_GNUC_INTERNAL gboolean
 506 g_dbus_action_group_sync (GDBusActionGroup  *group,
 507                           GCancellable      *cancellable,
 508                           GError           **error)
 509 {
 510   GVariant *reply;
 511
 512   g_assert (group->subscription_id == 0);
 513
 514   group->subscription_id =
 515     g_dbus_connection_signal_subscribe (group->connection, group->bus_name, "org.gtk.Actions", "Changed", group->object_path,
 516                                         NULL, G_DBUS_SIGNAL_FLAGS_NONE, g_dbus_action_group_changed, group, NULL);
 517
 518   reply = g_dbus_connection_call_sync (group->connection, group->bus_name, group->object_path, "org.gtk.Actions",
 519                                        "DescribeAll", NULL, G_VARIANT_TYPE ("(a{s(bgav)})"),
 520                                        G_DBUS_CALL_FLAGS_NONE, -1, cancellable, error);
 521
 522   if (reply != NULL)
 523     {
 524       GVariantIter *iter;
 525       ActionInfo *action;
 526
 527       g_assert (group->actions == NULL);
 528       group->actions = g_hash_table_new_full (g_str_hash, g_str_equal, NULL, action_info_free);
 529
 530       g_variant_get (reply, "(a{s(bgav)})", &iter);
 531       while ((action = action_info_new_from_iter (iter)))
 532         g_hash_table_insert (group->actions, action->name, action);
 533       g_variant_iter_free (iter);
 534       g_variant_unref (reply);
 535     }
 536
 537   return reply != NULL;
 538 }