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