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45e604d029
accept more than one callback. g_bus_own_name_with_closures g_bus_own_name_on_connection_with_closures g_bus_watch_name_with_closures g_bus_watch_name_on_connection_with_closures g_bus_watch_proxy_with_closures g_bus_watch_proxy_on_connection_with_closures https://bugzilla.gnome.org/show_bug.cgi?id=621092
667 lines
24 KiB
C
667 lines
24 KiB
C
/* GDBus - GLib D-Bus Library
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*
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* Copyright (C) 2008-2010 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Author: David Zeuthen <davidz@redhat.com>
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*/
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#include "config.h"
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#include <stdlib.h>
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#include "gdbusutils.h"
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#include "gdbusconnection.h"
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#include "gdbusnamewatching.h"
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#include "gdbusproxywatching.h"
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#include "gdbuserror.h"
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#include "gdbusprivate.h"
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#include "gdbusproxy.h"
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#include "gcancellable.h"
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#include "glibintl.h"
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#include "gioalias.h"
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/**
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* SECTION:gdbusproxywatching
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* @title: Watching Proxies
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* @short_description: Simple API for watching proxies
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* @include: gio/gio.h
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*
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* Convenience API for watching bus proxies.
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*
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* <example id="gdbus-watching-proxy"><title>Simple application watching a proxy</title><programlisting><xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gdbus-example-watch-proxy.c"><xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback></xi:include></programlisting></example>
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*/
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/* ---------------------------------------------------------------------------------------------------- */
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G_LOCK_DEFINE_STATIC (lock);
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static guint next_global_id = 1;
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static GHashTable *map_id_to_client = NULL;
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/* ---------------------------------------------------------------------------------------------------- */
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typedef struct
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{
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guint id;
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GBusProxyAppearedCallback proxy_appeared_handler;
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GBusProxyVanishedCallback proxy_vanished_handler;
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gpointer user_data;
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GDestroyNotify user_data_free_func;
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GMainContext *main_context;
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gchar *name;
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gchar *name_owner;
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GDBusConnection *connection;
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guint name_watcher_id;
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GCancellable *cancellable;
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gchar *object_path;
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gchar *interface_name;
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GType interface_type;
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GDBusProxyFlags proxy_flags;
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GDBusProxy *proxy;
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gboolean initial_construction;
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} Client;
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static void
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client_unref (Client *client)
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{
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/* ensure we're only called from g_bus_unwatch_proxy */
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g_assert (client->name_watcher_id == 0);
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g_free (client->name_owner);
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if (client->connection != NULL)
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g_object_unref (client->connection);
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if (client->proxy != NULL)
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g_object_unref (client->proxy);
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g_free (client->name);
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g_free (client->object_path);
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g_free (client->interface_name);
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if (client->main_context != NULL)
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g_main_context_unref (client->main_context);
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if (client->user_data_free_func != NULL)
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client->user_data_free_func (client->user_data);
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g_free (client);
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}
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/* ---------------------------------------------------------------------------------------------------- */
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static void
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proxy_constructed_cb (GObject *source_object,
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GAsyncResult *res,
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gpointer user_data)
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{
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Client *client = user_data;
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GDBusProxy *proxy;
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GError *error;
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error = NULL;
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proxy = g_dbus_proxy_new_finish (res, &error);
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if (proxy == NULL)
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{
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/* g_warning ("error while constructing proxy: %s", error->message); */
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g_error_free (error);
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/* handle initial construction, send out vanished if the name
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* is there but we constructing a proxy fails
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*/
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if (client->initial_construction)
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{
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if (client->proxy_vanished_handler != NULL)
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{
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client->proxy_vanished_handler (client->connection,
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client->name,
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client->user_data);
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}
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client->initial_construction = FALSE;
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}
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}
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else
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{
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g_assert (client->proxy == NULL);
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g_assert (client->cancellable != NULL);
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client->proxy = G_DBUS_PROXY (proxy);
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g_object_unref (client->cancellable);
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client->cancellable = NULL;
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/* perform callback */
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if (client->proxy_appeared_handler != NULL)
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{
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client->proxy_appeared_handler (client->connection,
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client->name,
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client->name_owner,
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client->proxy,
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client->user_data);
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}
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client->initial_construction = FALSE;
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}
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}
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static void
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on_name_appeared (GDBusConnection *connection,
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const gchar *name,
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const gchar *name_owner,
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gpointer user_data)
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{
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Client *client = user_data;
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//g_debug ("\n\nname appeared (owner `%s')", name_owner);
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/* invariants */
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g_assert (client->name_owner == NULL);
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g_assert (client->connection == NULL);
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g_assert (client->cancellable == NULL);
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client->name_owner = g_strdup (name_owner);
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client->connection = g_object_ref (connection);
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client->cancellable = g_cancellable_new ();
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g_dbus_proxy_new (client->connection,
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client->interface_type,
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client->proxy_flags,
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NULL, /* GDBusInterfaceInfo */
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client->name_owner,
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client->object_path,
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client->interface_name,
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client->cancellable,
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proxy_constructed_cb,
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client);
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}
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static void
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on_name_vanished (GDBusConnection *connection,
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const gchar *name,
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gpointer user_data)
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{
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Client *client = user_data;
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/*g_debug ("\n\nname vanished");*/
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g_free (client->name_owner);
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if (client->connection != NULL)
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g_object_unref (client->connection);
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client->name_owner = NULL;
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client->connection = NULL;
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/* free the proxy if we have it */
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if (client->proxy != NULL)
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{
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g_assert (client->cancellable == NULL);
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g_object_unref (client->proxy);
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client->proxy = NULL;
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/* if we have the proxy, it means we last sent out a 'appeared'
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* callback - so send out a 'vanished' callback
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*/
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if (client->proxy_vanished_handler != NULL)
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{
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client->proxy_vanished_handler (client->connection,
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client->name,
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client->user_data);
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}
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client->initial_construction = FALSE;
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}
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else
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{
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/* otherwise cancel construction of the proxy if applicable */
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if (client->cancellable != NULL)
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{
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g_cancellable_cancel (client->cancellable);
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g_object_unref (client->cancellable);
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client->cancellable = NULL;
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}
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else
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{
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/* handle initial construction, send out vanished if
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* the name isn't there
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*/
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if (client->initial_construction)
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{
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if (client->proxy_vanished_handler != NULL)
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{
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client->proxy_vanished_handler (client->connection,
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client->name,
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client->user_data);
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}
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client->initial_construction = FALSE;
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}
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}
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}
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}
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/**
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* g_bus_watch_proxy:
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* @bus_type: The type of bus to watch a name on.
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* @name: The name (well-known or unique) to watch.
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* @flags: Flags from the #GBusNameWatcherFlags enumeration.
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* @object_path: The object path of the remote object to watch.
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* @interface_name: The D-Bus interface name for the proxy.
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* @interface_type: The #GType for the kind of proxy to create. This must be a #GDBusProxy derived type.
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* @proxy_flags: Flags from #GDBusProxyFlags to use when constructing the proxy.
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* @proxy_appeared_handler: Handler to invoke when @name is known to exist and the
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* requested proxy is available.
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* @proxy_vanished_handler: Handler to invoke when @name is known to not exist
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* and the previously created proxy is no longer available.
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* @user_data: User data to pass to handlers.
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* @user_data_free_func: Function for freeing @user_data or %NULL.
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*
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* Starts watching a remote object at @object_path owned by @name on
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* the bus specified by @bus_type. When the object is available, a
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* #GDBusProxy (or derived class cf. @interface_type) instance is
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* constructed for the @interface_name D-Bus interface and then
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* @proxy_appeared_handler will be called when the proxy is ready and
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* all properties have been loaded. When @name vanishes,
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* @proxy_vanished_handler is called.
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*
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* This function makes it very simple to write applications that wants
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* to watch a well-known remote object on a well-known name, see <xref
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* linkend="gdbus-watching-proxy"/>. Basically, the application simply
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* starts using the proxy when @proxy_appeared_handler is called and
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* stops using it when @proxy_vanished_handler is called. Callbacks
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* will be invoked in the <link
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* linkend="g-main-context-push-thread-default">thread-default main
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* loop</link> of the thread you are calling this function from.
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*
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* Applications typically use this function to watch the
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* <quote>manager</quote> object of a well-known name. Upon acquiring
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* a proxy for the manager object, applications typically construct
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* additional proxies in response to the result of enumeration methods
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* on the manager object.
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*
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* Many of the comments that apply to g_bus_watch_name() also apply
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* here. For example, you are guaranteed that one of the handlers will
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* be invoked (on the main thread) after calling this function and
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* also that the two handlers alternate. When you are done watching the
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* proxy, just call g_bus_unwatch_proxy().
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*
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* Returns: An identifier (never 0) that can be used with
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* g_bus_unwatch_proxy() to stop watching the remote object.
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*
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* Since: 2.26
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*/
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guint
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g_bus_watch_proxy (GBusType bus_type,
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const gchar *name,
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GBusNameWatcherFlags flags,
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const gchar *object_path,
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const gchar *interface_name,
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GType interface_type,
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GDBusProxyFlags proxy_flags,
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GBusProxyAppearedCallback proxy_appeared_handler,
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GBusProxyVanishedCallback proxy_vanished_handler,
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gpointer user_data,
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GDestroyNotify user_data_free_func)
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{
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Client *client;
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g_return_val_if_fail (g_dbus_is_name (name), 0);
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g_return_val_if_fail (g_variant_is_object_path (object_path), 0);
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g_return_val_if_fail (g_dbus_is_interface_name (interface_name), 0);
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g_return_val_if_fail (g_type_is_a (interface_type, G_TYPE_DBUS_PROXY), 0);
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G_LOCK (lock);
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client = g_new0 (Client, 1);
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client->id = next_global_id++; /* TODO: uh oh, handle overflow */
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client->name = g_strdup (name);
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client->proxy_appeared_handler = proxy_appeared_handler;
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client->proxy_vanished_handler = proxy_vanished_handler;
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client->user_data = user_data;
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client->user_data_free_func = user_data_free_func;
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client->main_context = g_main_context_get_thread_default ();
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if (client->main_context != NULL)
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g_main_context_ref (client->main_context);
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client->name_watcher_id = g_bus_watch_name (bus_type,
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name,
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flags,
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on_name_appeared,
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on_name_vanished,
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client,
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NULL);
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client->object_path = g_strdup (object_path);
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client->interface_name = g_strdup (interface_name);
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client->interface_type = interface_type;
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client->proxy_flags = proxy_flags;
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client->initial_construction = TRUE;
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if (map_id_to_client == NULL)
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{
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map_id_to_client = g_hash_table_new (g_direct_hash, g_direct_equal);
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}
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g_hash_table_insert (map_id_to_client,
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GUINT_TO_POINTER (client->id),
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client);
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G_UNLOCK (lock);
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return client->id;
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}
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/**
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* g_bus_watch_proxy_on_connection:
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* @connection: A #GDBusConnection that is not closed.
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* @name: The name (well-known or unique) to watch.
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* @flags: Flags from the #GBusNameWatcherFlags enumeration.
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* @object_path: The object path of the remote object to watch.
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* @interface_name: The D-Bus interface name for the proxy.
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* @interface_type: The #GType for the kind of proxy to create. This must be a #GDBusProxy derived type.
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* @proxy_flags: Flags from #GDBusProxyFlags to use when constructing the proxy.
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* @proxy_appeared_handler: Handler to invoke when @name is known to exist and the
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* requested proxy is available.
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* @proxy_vanished_handler: Handler to invoke when @name is known to not exist
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* and the previously created proxy is no longer available.
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* @user_data: User data to pass to handlers.
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* @user_data_free_func: Function for freeing @user_data or %NULL.
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*
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* Like g_bus_watch_proxy() but takes a #GDBusConnection instead of a
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* #GBusType.
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*
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* Returns: An identifier (never 0) that can be used with
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* g_bus_unwatch_proxy() to stop watching the remote object.
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*
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* Since: 2.26
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*/
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guint
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g_bus_watch_proxy_on_connection (GDBusConnection *connection,
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const gchar *name,
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GBusNameWatcherFlags flags,
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const gchar *object_path,
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const gchar *interface_name,
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GType interface_type,
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GDBusProxyFlags proxy_flags,
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GBusProxyAppearedCallback proxy_appeared_handler,
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GBusProxyVanishedCallback proxy_vanished_handler,
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gpointer user_data,
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GDestroyNotify user_data_free_func)
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{
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Client *client;
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g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
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g_return_val_if_fail (g_dbus_is_name (name), 0);
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g_return_val_if_fail (g_variant_is_object_path (object_path), 0);
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g_return_val_if_fail (g_dbus_is_interface_name (interface_name), 0);
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g_return_val_if_fail (g_type_is_a (interface_type, G_TYPE_DBUS_PROXY), 0);
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G_LOCK (lock);
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client = g_new0 (Client, 1);
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client->id = next_global_id++; /* TODO: uh oh, handle overflow */
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client->name = g_strdup (name);
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client->proxy_appeared_handler = proxy_appeared_handler;
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client->proxy_vanished_handler = proxy_vanished_handler;
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client->user_data = user_data;
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client->user_data_free_func = user_data_free_func;
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client->main_context = g_main_context_get_thread_default ();
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if (client->main_context != NULL)
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g_main_context_ref (client->main_context);
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client->name_watcher_id = g_bus_watch_name_on_connection (connection,
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name,
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flags,
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on_name_appeared,
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on_name_vanished,
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client,
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NULL);
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client->object_path = g_strdup (object_path);
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client->interface_name = g_strdup (interface_name);
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client->interface_type = interface_type;
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client->proxy_flags = proxy_flags;
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client->initial_construction = TRUE;
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if (map_id_to_client == NULL)
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{
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map_id_to_client = g_hash_table_new (g_direct_hash, g_direct_equal);
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}
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g_hash_table_insert (map_id_to_client,
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GUINT_TO_POINTER (client->id),
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client);
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G_UNLOCK (lock);
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return client->id;
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}
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typedef struct {
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GClosure *proxy_appeared_closure;
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GClosure *proxy_vanished_closure;
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} WatchProxyData;
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static void
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watch_with_closures_on_proxy_appeared (GDBusConnection *connection,
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const gchar *name,
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const gchar *name_owner,
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GDBusProxy *proxy,
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gpointer user_data)
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{
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WatchProxyData *data = user_data;
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GValue params[4] = { { 0, }, { 0, }, { 0, }, { 0, } };
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g_value_init (¶ms[0], G_TYPE_DBUS_CONNECTION);
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g_value_set_object (¶ms[0], connection);
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g_value_init (¶ms[1], G_TYPE_STRING);
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g_value_set_string (¶ms[1], name);
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g_value_init (¶ms[2], G_TYPE_STRING);
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g_value_set_string (¶ms[2], name_owner);
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g_value_init (¶ms[3], G_TYPE_DBUS_PROXY);
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g_value_set_object (¶ms[3], proxy);
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g_closure_invoke (data->proxy_appeared_closure, NULL, 4, params, NULL);
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}
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static void
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watch_with_closures_on_proxy_vanished (GDBusConnection *connection,
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const gchar *name,
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gpointer user_data)
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{
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WatchProxyData *data = user_data;
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GValue params[2] = { { 0, }, { 0, } };
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g_value_init (¶ms[0], G_TYPE_DBUS_CONNECTION);
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g_value_set_object (¶ms[0], connection);
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g_value_init (¶ms[1], G_TYPE_STRING);
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g_value_set_string (¶ms[1], name);
|
|
|
|
g_closure_invoke (data->proxy_vanished_closure, NULL, 2, params, NULL);
|
|
}
|
|
|
|
static void
|
|
bus_watch_proxy_free_func (gpointer user_data)
|
|
{
|
|
WatchProxyData *data = user_data;
|
|
|
|
if (data->proxy_appeared_closure != NULL)
|
|
g_closure_unref (data->proxy_appeared_closure);
|
|
|
|
if (data->proxy_vanished_closure != NULL)
|
|
g_closure_unref (data->proxy_vanished_closure);
|
|
|
|
g_free (data);
|
|
}
|
|
|
|
/**
|
|
* g_bus_watch_proxy_with_closures:
|
|
* @bus_type: The type of bus to watch a name on.
|
|
* @name: The name (well-known or unique) to watch.
|
|
* @flags: Flags from the #GBusNameWatcherFlags enumeration.
|
|
* @object_path: The object path of the remote object to watch.
|
|
* @interface_name: The D-Bus interface name for the proxy.
|
|
* @interface_type: The #GType for the kind of proxy to create. This must be a #GDBusProxy derived type.
|
|
* @proxy_flags: Flags from #GDBusProxyFlags to use when constructing the proxy.
|
|
* @proxy_appeared_closure: (allow-none): #GClosure to invoke when @name is
|
|
* known to exist and the requested proxy is available.
|
|
* @proxy_vanished_closure: (allow-none): #GClosure to invoke when @name is
|
|
* known to not exist and the previously created proxy is no longer available.
|
|
*
|
|
* Version of g_bus_watch_proxy() using closures instead of callbacks for
|
|
* easier binding in other languages.
|
|
*
|
|
* Returns: An identifier (never 0) that can be used with
|
|
* g_bus_unwatch_proxy() to stop watching the remote object.
|
|
*
|
|
* Rename to: g_bus_watch_proxy
|
|
*
|
|
* Since: 2.26
|
|
*/
|
|
guint
|
|
g_bus_watch_proxy_with_closures (GBusType bus_type,
|
|
const gchar *name,
|
|
GBusNameWatcherFlags flags,
|
|
const gchar *object_path,
|
|
const gchar *interface_name,
|
|
GType interface_type,
|
|
GDBusProxyFlags proxy_flags,
|
|
GClosure *proxy_appeared_closure,
|
|
GClosure *proxy_vanished_closure)
|
|
{
|
|
WatchProxyData *data;
|
|
|
|
data = g_new0 (WatchProxyData, 1);
|
|
|
|
if (proxy_appeared_closure != NULL)
|
|
data->proxy_appeared_closure = g_closure_ref (proxy_appeared_closure);
|
|
|
|
if (proxy_vanished_closure != NULL)
|
|
data->proxy_vanished_closure = g_closure_ref (proxy_vanished_closure);
|
|
|
|
return g_bus_watch_proxy (bus_type,
|
|
name,
|
|
flags,
|
|
object_path,
|
|
interface_name,
|
|
interface_type,
|
|
proxy_flags,
|
|
proxy_appeared_closure != NULL ? watch_with_closures_on_proxy_appeared : NULL,
|
|
proxy_vanished_closure != NULL ? watch_with_closures_on_proxy_vanished : NULL,
|
|
data,
|
|
bus_watch_proxy_free_func);
|
|
}
|
|
|
|
/**
|
|
* g_bus_watch_proxy_on_connection_with_closures:
|
|
* @connection: A #GDBusConnection that is not closed.
|
|
* @name: The name (well-known or unique) to watch.
|
|
* @flags: Flags from the #GBusNameWatcherFlags enumeration.
|
|
* @object_path: The object path of the remote object to watch.
|
|
* @interface_name: The D-Bus interface name for the proxy.
|
|
* @interface_type: The #GType for the kind of proxy to create. This must be a #GDBusProxy derived type.
|
|
* @proxy_flags: Flags from #GDBusProxyFlags to use when constructing the proxy.
|
|
* @proxy_appeared_closure: (allow-none): #GClosure to invoke when @name is
|
|
* known to exist and the requested proxy is available.
|
|
* @proxy_vanished_closure: (allow-none): #GClosure to invoke when @name is
|
|
* known to not exist and the previously created proxy is no longer available.
|
|
*
|
|
* Version of g_bus_watch_proxy_on_connection() using closures instead of
|
|
* callbacks for easier binding in other languages.
|
|
*
|
|
* Returns: An identifier (never 0) that can be used with
|
|
* g_bus_unwatch_proxy() to stop watching the remote object.
|
|
*
|
|
* Rename to: g_bus_watch_proxy_on_connection
|
|
*
|
|
* Since: 2.26
|
|
*/
|
|
guint
|
|
g_bus_watch_proxy_on_connection_with_closures (
|
|
GDBusConnection *connection,
|
|
const gchar *name,
|
|
GBusNameWatcherFlags flags,
|
|
const gchar *object_path,
|
|
const gchar *interface_name,
|
|
GType interface_type,
|
|
GDBusProxyFlags proxy_flags,
|
|
GClosure *proxy_appeared_closure,
|
|
GClosure *proxy_vanished_closure)
|
|
{
|
|
WatchProxyData *data;
|
|
|
|
data = g_new0 (WatchProxyData, 1);
|
|
|
|
if (proxy_appeared_closure != NULL)
|
|
data->proxy_appeared_closure = g_closure_ref (proxy_appeared_closure);
|
|
|
|
if (proxy_vanished_closure != NULL)
|
|
data->proxy_vanished_closure = g_closure_ref (proxy_vanished_closure);
|
|
|
|
return g_bus_watch_proxy_on_connection (connection,
|
|
name,
|
|
flags,
|
|
object_path,
|
|
interface_name,
|
|
interface_type,
|
|
proxy_flags,
|
|
proxy_appeared_closure != NULL ? watch_with_closures_on_proxy_appeared : NULL,
|
|
proxy_vanished_closure != NULL ? watch_with_closures_on_proxy_vanished : NULL,
|
|
data,
|
|
bus_watch_proxy_free_func);
|
|
}
|
|
|
|
/**
|
|
* g_bus_unwatch_proxy:
|
|
* @watcher_id: An identifier obtained from g_bus_watch_proxy()
|
|
*
|
|
* Stops watching proxy.
|
|
*
|
|
* Since: 2.26
|
|
*/
|
|
void
|
|
g_bus_unwatch_proxy (guint watcher_id)
|
|
{
|
|
Client *client;
|
|
|
|
g_return_if_fail (watcher_id > 0);
|
|
|
|
client = NULL;
|
|
|
|
G_LOCK (lock);
|
|
if (watcher_id == 0 ||
|
|
map_id_to_client == NULL ||
|
|
(client = g_hash_table_lookup (map_id_to_client, GUINT_TO_POINTER (watcher_id))) == NULL)
|
|
{
|
|
g_warning ("Invalid id %d passed to g_bus_unwatch_proxy()", watcher_id);
|
|
goto out;
|
|
}
|
|
|
|
g_warn_if_fail (g_hash_table_remove (map_id_to_client, GUINT_TO_POINTER (watcher_id)));
|
|
|
|
out:
|
|
G_UNLOCK (lock);
|
|
|
|
if (client != NULL)
|
|
{
|
|
g_bus_unwatch_name (client->name_watcher_id);
|
|
client->name_watcher_id = 0;
|
|
client_unref (client);
|
|
}
|
|
}
|
|
|
|
#define __G_DBUS_PROXY_WATCHING_C__
|
|
#include "gioaliasdef.c"
|