+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-

+ *

+ * Copyright (C) 2006-2008 Richard Hughes <[email protected]>

+ *

+ * Licensed under the GNU General Public License Version 2

+ *

+ * This program is free software; you can redistribute it and/or modify

+ * it under the terms of the GNU General Public License as published by

+ * the Free Software Foundation; either version 2 of the License, or

+ * (at your option) any later version.

+ *

+ * This program is distributed in the hope that it will be useful,

+ * but WITHOUT ANY WARRANTY; without even the implied warranty of

+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

+ * GNU General Public License for more details.

+ *

+ * You should have received a copy of the GNU General Public License

+ * along with this program; if not, write to the Free Software

+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

+ */

+

+#include "config.h"

+

+#include <string.h>

+#include <stdlib.h>

+#include <stdio.h>

+#include <glib.h>

+#include <dbus/dbus-glib.h>

+#include <dbus/dbus-glib-lowlevel.h>

+#include <dbus/dbus.h>

+

+#include "egg-debug.h"

+#include "egg-dbus-monitor.h"

+

+static void egg_dbus_monitor_finalize (GObject *object);

+

+#define EGG_DBUS_MONITOR_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), EGG_TYPE_DBUS_MONITOR, EggDbusMonitorPrivate))

+

+struct EggDbusMonitorPrivate

+{

+ gchar *service;

+ DBusGProxy *proxy;

+ DBusGConnection *connection;

+ const gchar *unique_name;

+};

+

+enum {

+ EGG_DBUS_MONITOR_CONNECTION_CHANGED,

+ EGG_DBUS_MONITOR_CONNECTION_REPLACED,

+ EGG_DBUS_MONITOR_LAST_SIGNAL

+};

+

+static guint signals [EGG_DBUS_MONITOR_LAST_SIGNAL] = { 0 };

+

+G_DEFINE_TYPE (EggDbusMonitor, egg_dbus_monitor, G_TYPE_OBJECT)

+

+/**

+ * egg_dbus_monitor_name_owner_changed_cb:

+ **/

+static void

+egg_dbus_monitor_name_owner_changed_cb (DBusGProxy *proxy, const gchar *name,

+ const gchar *prev, const gchar *new,

+ EggDbusMonitor *monitor)

+{

+ guint new_len;

+ guint prev_len;

+

+ g_return_if_fail (EGG_IS_DBUS_MONITOR (monitor));

+ if (monitor->priv->proxy == NULL)

+ return;

+

+ /* not us */

+ if (strcmp (name, monitor->priv->service) != 0)

+ return;

+

+ /* ITS4: ignore, not used for allocation */

+ new_len = strlen (new);

+ /* ITS4: ignore, not used for allocation */

+ prev_len = strlen (prev);

+

+ /* something --> nothing */

+ if (prev_len != 0 && new_len == 0) {

+ g_signal_emit (monitor, signals [EGG_DBUS_MONITOR_CONNECTION_CHANGED], 0, FALSE);

+ return;

+ }

+

+ /* nothing --> something */

+ if (prev_len == 0 && new_len != 0) {

+ g_signal_emit (monitor, signals [EGG_DBUS_MONITOR_CONNECTION_CHANGED], 0, TRUE);

+ return;

+ }

+

+ /* something --> something (we've replaced the old process) */

+ if (prev_len != 0 && new_len != 0) {

+ /* only send this to the prev client */

+ if (strcmp (monitor->priv->unique_name, prev) == 0)

+ g_signal_emit (monitor, signals [EGG_DBUS_MONITOR_CONNECTION_REPLACED], 0);

+ return;

+ }

+}

+

+/**

+ * egg_dbus_monitor_assign:

+ * @monitor: This class instance

+ * @connection: The bus connection

+ * @service: The EGG_DBUS_MONITOR service name

+ * Return value: success

+ *

+ * Emits connection-changed(TRUE) if connection is alive - this means you

+ * have to connect up the callback before this function is called.

+ **/

+gboolean

+egg_dbus_monitor_assign (EggDbusMonitor *monitor, DBusGConnection *connection, const gchar *service)

+{

+ GError *error = NULL;

+ gboolean connected;

+ DBusConnection *conn;

+

+ g_return_val_if_fail (EGG_IS_DBUS_MONITOR (monitor), FALSE);

+ g_return_val_if_fail (service != NULL, FALSE);

+ g_return_val_if_fail (connection != NULL, FALSE);

+

+ if (monitor->priv->proxy != NULL) {

+ egg_warning ("already assigned!");

+ return FALSE;

+ }

+

+ monitor->priv->service = g_strdup (service);

+ monitor->priv->connection = connection;

+ monitor->priv->proxy = dbus_g_proxy_new_for_name_owner (monitor->priv->connection,

+ DBUS_SERVICE_DBUS,

+ DBUS_PATH_DBUS,

+ DBUS_INTERFACE_DBUS,

+ &error);

+ if (error != NULL) {

+ egg_warning ("Cannot connect to DBUS: %s", error->message);

+ g_error_free (error);

+ return FALSE;

+ }

+ dbus_g_proxy_add_signal (monitor->priv->proxy, "NameOwnerChanged",

+ G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_INVALID);

+ dbus_g_proxy_connect_signal (monitor->priv->proxy, "NameOwnerChanged",

+ G_CALLBACK (egg_dbus_monitor_name_owner_changed_cb),

+ monitor, NULL);

+

+ /* coldplug */

+ connected = egg_dbus_monitor_is_connected (monitor);

+ if (connected)

+ g_signal_emit (monitor, signals [EGG_DBUS_MONITOR_CONNECTION_CHANGED], 0, TRUE);

+

+ /* save this for the replaced check */

+ conn = dbus_g_connection_get_connection (monitor->priv->connection);

+ monitor->priv->unique_name = dbus_bus_get_unique_name (conn);

+ return TRUE;

+}

+

+/**

+ * egg_dbus_monitor_is_connected:

+ * @monitor: This class instance

+ * Return value: if we are connected to a valid watch

+ **/

+gboolean

+egg_dbus_monitor_is_connected (EggDbusMonitor *monitor)

+{

+ DBusError error;

+ DBusConnection *conn;

+ gboolean ret;

+ g_return_val_if_fail (EGG_IS_DBUS_MONITOR (monitor), FALSE);

+

+ /* get raw connection */

+ conn = dbus_g_connection_get_connection (monitor->priv->connection);

+ dbus_error_init (&error);

+ ret = dbus_bus_name_has_owner (conn, monitor->priv->service, &error);

+ if (dbus_error_is_set (&error)) {

+ egg_debug ("error: %s", error.message);

+ dbus_error_free (&error);

+ }

+

+ return ret;

+}

+

+/**

+ * egg_dbus_monitor_class_init:

+ * @klass: The EggDbusMonitorClass

+ **/

+static void

+egg_dbus_monitor_class_init (EggDbusMonitorClass *klass)

+{

+ GObjectClass *object_class = G_OBJECT_CLASS (klass);

+ object_class->finalize = egg_dbus_monitor_finalize;

+ g_type_class_add_private (klass, sizeof (EggDbusMonitorPrivate));

+ signals [EGG_DBUS_MONITOR_CONNECTION_CHANGED] =

+ g_signal_new ("connection-changed",

+ G_TYPE_FROM_CLASS (object_class), G_SIGNAL_RUN_LAST,

+ G_STRUCT_OFFSET (EggDbusMonitorClass, connection_changed),

+ NULL, NULL, g_cclosure_marshal_VOID__BOOLEAN,

+ G_TYPE_NONE, 1, G_TYPE_BOOLEAN);

+ signals [EGG_DBUS_MONITOR_CONNECTION_REPLACED] =

+ g_signal_new ("connection-replaced",

+ G_TYPE_FROM_CLASS (object_class), G_SIGNAL_RUN_LAST,

+ G_STRUCT_OFFSET (EggDbusMonitorClass, connection_replaced),

+ NULL, NULL, g_cclosure_marshal_VOID__VOID,

+ G_TYPE_NONE, 0);

+}

+

+/**

+ * egg_dbus_monitor_init:

+ * @monitor: This class instance

+ **/

+static void

+egg_dbus_monitor_init (EggDbusMonitor *monitor)

+{

+ monitor->priv = EGG_DBUS_MONITOR_GET_PRIVATE (monitor);

+ monitor->priv->service = NULL;

+ monitor->priv->connection = NULL;

+ monitor->priv->proxy = NULL;

+}

+

+/**

+ * egg_dbus_monitor_finalize:

+ * @object: The object to finalize

+ **/

+static void

+egg_dbus_monitor_finalize (GObject *object)

+{

+ EggDbusMonitor *monitor;

+

+ g_return_if_fail (EGG_IS_DBUS_MONITOR (object));

+

+ monitor = EGG_DBUS_MONITOR (object);

+

+ g_return_if_fail (monitor->priv != NULL);

+ if (monitor->priv->proxy != NULL)

+ g_object_unref (monitor->priv->proxy);

+

+ G_OBJECT_CLASS (egg_dbus_monitor_parent_class)->finalize (object);

+}

+

+/**

+ * egg_dbus_monitor_new:

+ *

+ * Return value: a new EggDbusMonitor object.

+ **/

+EggDbusMonitor *

+egg_dbus_monitor_new (void)

+{

+ EggDbusMonitor *monitor;

+ monitor = g_object_new (EGG_TYPE_DBUS_MONITOR, NULL);

+ return EGG_DBUS_MONITOR (monitor);

+}

+