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egg-dbus-monitor.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
 *
 * Copyright (C) 2006-2008 Richard Hughes <richard@hughsie.com>
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 (monitor->priv->connection,
                                                DBUS_SERVICE_DBUS,
                                                DBUS_PATH_DBUS,
                                                DBUS_INTERFACE_DBUS);
      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);
}


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