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+/* -*- 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);
+}
+