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[empathy] Autoreject incoming calls if there are others in progress

commit 19c228d5cd6a1eec12b0d7d015bb0fc49821f1ce
Author: Emilio Pozuelo Monfort <emilio pozuelo collabora co uk>
Date:   Mon Mar 7 11:40:35 2011 +0000

    Autoreject incoming calls if there are others in progress
    
    https://bugzilla.gnome.org/show_bug.cgi?id=643656

 src/Makefile.am             |    1 +
 src/empathy-call-observer.c |  287 +++++++++++++++++++++++++++++++++++++++++++
 src/empathy-call-observer.h |   54 ++++++++
 src/empathy-main-window.c   |    6 +-
 4 files changed, 347 insertions(+), 1 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 5dfa838..cf3efb0 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -154,6 +154,7 @@ empathy_handwritten_source = \
 	empathy-migrate-butterfly-logs.c empathy-migrate-butterfly-logs.h \
 	empathy-new-chatroom-dialog.c empathy-new-chatroom-dialog.h	\
 	empathy-notifications-approver.c empathy-notifications-approver.h \
+	empathy-call-observer.c empathy-call-observer.h			\
 	empathy-preferences.c empathy-preferences.h			\
 	empathy-status-icon.c empathy-status-icon.h			\
 	empathy-chat-manager.c empathy-chat-manager.h			\
diff --git a/src/empathy-call-observer.c b/src/empathy-call-observer.c
new file mode 100644
index 0000000..dcdddb5
--- /dev/null
+++ b/src/empathy-call-observer.c
@@ -0,0 +1,287 @@
+/*
+ * Copyright (C) 2011 Collabora Ltd.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Authors: Emilio Pozuelo Monfort <emilio pozuelo collabora co uk>
+ */
+
+#include <config.h>
+
+#include <telepathy-glib/telepathy-glib.h>
+
+#include <telepathy-yell/telepathy-yell.h>
+
+#include <libempathy/empathy-channel-factory.h>
+#include <libempathy/empathy-utils.h>
+
+#include <extensions/extensions.h>
+
+#include "empathy-call-observer.h"
+
+#define DEBUG_FLAG EMPATHY_DEBUG_DISPATCHER
+#include <libempathy/empathy-debug.h>
+
+struct _EmpathyCallObserverPriv {
+  TpBaseClient *observer;
+
+  /* Ongoing calls, as reffed TpChannels */
+  GList *channels;
+};
+
+/* The Call Observer looks at incoming and outgoing calls, and
+ * autorejects incoming ones if there are ongoing ones, since
+ * we don't cope with simultaneous calls quite well yet.
+ * At some point, we should ask the user if he wants to put the
+ * current call on hold and answer the incoming one instead,
+ * see https://bugzilla.gnome.org/show_bug.cgi?id=623348
+ */
+G_DEFINE_TYPE (EmpathyCallObserver, empathy_call_observer, G_TYPE_OBJECT);
+
+static EmpathyCallObserver * observer_singleton = NULL;
+
+static void
+on_channel_closed (TpProxy *proxy,
+    guint    domain,
+    gint     code,
+    gchar   *message,
+    EmpathyCallObserver *self)
+{
+  self->priv->channels = g_list_remove (self->priv->channels, proxy);
+  g_object_unref (proxy);
+}
+
+static void
+on_cdo_claim_cb (GObject *source_object,
+    GAsyncResult *result,
+    gpointer user_data)
+{
+  TpChannelDispatchOperation *cdo;
+  TpChannel *channel = TP_CHANNEL (user_data);
+  GError *error = NULL;
+
+  cdo = TP_CHANNEL_DISPATCH_OPERATION (source_object);
+
+  tp_channel_dispatch_operation_claim_finish (cdo, result, &error);
+  if (error != NULL)
+    {
+      DEBUG ("Could not claim CDO: %s", error->message);
+      g_error_free (error);
+      return;
+    }
+
+  tp_channel_leave_async (channel,
+      TP_CHANNEL_GROUP_CHANGE_REASON_BUSY, "Already in a call",
+      NULL, NULL);
+}
+
+static TpChannel *
+find_main_channel (GList *channels)
+{
+  GList *l;
+
+  for (l = channels; l != NULL; l = g_list_next (l))
+    {
+      TpChannel *channel = l->data;
+      GQuark channel_type;
+
+      if (tp_proxy_get_invalidated (channel) != NULL)
+        continue;
+
+      channel_type = tp_channel_get_channel_type_id (channel);
+
+      if (channel_type == TP_IFACE_QUARK_CHANNEL_TYPE_STREAMED_MEDIA ||
+          channel_type == TPY_IFACE_QUARK_CHANNEL_TYPE_CALL)
+        return channel;
+    }
+
+  return NULL;
+}
+
+static gboolean
+has_ongoing_calls (EmpathyCallObserver *self)
+{
+  GList *l;
+
+  for (l = self->priv->channels; l != NULL; l = l->next)
+    {
+      TpChannel *channel = TP_CHANNEL (l->data);
+      GQuark type = tp_channel_get_channel_type_id (channel);
+
+      /* Check that Call channels are not ended */
+      if (type == TPY_IFACE_QUARK_CHANNEL_TYPE_CALL &&
+          tpy_call_channel_get_state (TPY_CALL_CHANNEL (channel), NULL, NULL)
+               == TPY_CALL_STATE_ENDED)
+        continue;
+
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
+static void
+observe_channels (TpSimpleObserver *observer,
+    TpAccount *account,
+    TpConnection *connection,
+    GList *channels,
+    TpChannelDispatchOperation *dispatch_operation,
+    GList *requests,
+    TpObserveChannelsContext *context,
+    gpointer user_data)
+{
+  EmpathyCallObserver *self = EMPATHY_CALL_OBSERVER (user_data);
+  TpChannel *channel;
+  const GError *error;
+
+  channel = find_main_channel (channels);
+  if (channel == NULL)
+    {
+      GError err = { TP_ERRORS, TP_ERROR_INVALID_ARGUMENT,
+          "Unknown channel type" };
+
+      DEBUG ("Didn't find any Call or StreamedMedia channel; ignoring");
+
+      tp_observe_channels_context_fail (context, &err);
+      return;
+    }
+
+  /* Autoreject if there are other ongoing calls */
+  if (has_ongoing_calls (self))
+    {
+      DEBUG ("Autorejecting incoming call since there are others in "
+          "progress: %s", tp_proxy_get_object_path (channel));
+      tp_channel_dispatch_operation_claim_async (dispatch_operation,
+          on_cdo_claim_cb, g_object_ref (channel));
+      return;
+    }
+
+  if ((error = tp_proxy_get_invalidated (channel)) != NULL)
+    {
+      DEBUG ("The channel has already been invalidated: %s",
+          error->message);
+      return;
+    }
+
+  tp_g_signal_connect_object (channel, "invalidated",
+      G_CALLBACK (on_channel_closed), self, 0);
+  self->priv->channels = g_list_prepend (self->priv->channels,
+      g_object_ref (channel));
+
+  tp_observe_channels_context_accept (context);
+}
+
+static GObject *
+observer_constructor (GType type,
+    guint n_props,
+    GObjectConstructParam *props)
+{
+  GObject *retval;
+
+  if (observer_singleton)
+    {
+      retval = g_object_ref (observer_singleton);
+    }
+  else
+    {
+      retval = G_OBJECT_CLASS (empathy_call_observer_parent_class)->constructor
+          (type, n_props, props);
+
+      observer_singleton = EMPATHY_CALL_OBSERVER (retval);
+      g_object_add_weak_pointer (retval, (gpointer) &observer_singleton);
+    }
+
+  return retval;
+}
+
+static void
+observer_dispose (GObject *object)
+{
+  EmpathyCallObserver *self = EMPATHY_CALL_OBSERVER (object);
+
+  tp_clear_object (&self->priv->observer);
+  g_list_free_full (self->priv->channels, g_object_unref);
+  self->priv->channels = NULL;
+}
+
+static void
+empathy_call_observer_class_init (EmpathyCallObserverClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->dispose = observer_dispose;
+  object_class->constructor = observer_constructor;
+
+  g_type_class_add_private (object_class, sizeof (EmpathyCallObserverPriv));
+}
+
+static void
+empathy_call_observer_init (EmpathyCallObserver *self)
+{
+  EmpathyCallObserverPriv *priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
+    EMPATHY_TYPE_CALL_OBSERVER, EmpathyCallObserverPriv);
+  TpDBusDaemon *dbus;
+  EmpathyChannelFactory *factory;
+  GError *error = NULL;
+
+  self->priv = priv;
+
+  dbus = tp_dbus_daemon_dup (&error);
+  if (dbus == NULL)
+    {
+      DEBUG ("Failed to get TpDBusDaemon: %s", error->message);
+      g_error_free (error);
+      return;
+    }
+
+  self->priv->observer = tp_simple_observer_new (dbus, FALSE,
+      "Empathy.CallObserver", FALSE,
+      observe_channels, self, NULL);
+
+  factory = empathy_channel_factory_dup ();
+  tp_base_client_set_channel_factory (self->priv->observer,
+      TP_CLIENT_CHANNEL_FACTORY (factory));
+  g_object_unref (factory);
+
+  /* Observe Call and StreamedMedia channels */
+  tp_base_client_take_observer_filter (self->priv->observer,
+      tp_asv_new (
+        TP_PROP_CHANNEL_CHANNEL_TYPE, G_TYPE_STRING,
+          TP_IFACE_CHANNEL_TYPE_STREAMED_MEDIA,
+        TP_PROP_CHANNEL_TARGET_HANDLE_TYPE, G_TYPE_UINT,
+          TP_HANDLE_TYPE_CONTACT,
+        NULL));
+  tp_base_client_take_observer_filter (self->priv->observer,
+      tp_asv_new (
+        TP_PROP_CHANNEL_CHANNEL_TYPE, G_TYPE_STRING,
+          TPY_IFACE_CHANNEL_TYPE_CALL,
+        TP_PROP_CHANNEL_TARGET_HANDLE_TYPE, G_TYPE_UINT,
+          TP_HANDLE_TYPE_CONTACT,
+        NULL));
+
+  if (!tp_base_client_register (self->priv->observer, &error))
+    {
+      DEBUG ("Failed to register observer: %s", error->message);
+      g_error_free (error);
+    }
+
+  g_object_unref (dbus);
+}
+
+EmpathyCallObserver *
+empathy_call_observer_dup_singleton (void)
+{
+  return g_object_new (EMPATHY_TYPE_CALL_OBSERVER, NULL);
+}
diff --git a/src/empathy-call-observer.h b/src/empathy-call-observer.h
new file mode 100644
index 0000000..1d5a58b
--- /dev/null
+++ b/src/empathy-call-observer.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2011 Collabora Ltd.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Authors: Emilio Pozuelo Monfort <emilio pozuelo collabora co uk>
+ */
+
+#ifndef __EMPATHY_CALL_OBSERVER_H__
+#define __EMPATHY_CALL_OBSERVER_H__
+
+#include <glib.h>
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define EMPATHY_TYPE_CALL_OBSERVER         (empathy_call_observer_get_type ())
+#define EMPATHY_CALL_OBSERVER(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), EMPATHY_TYPE_CALL_OBSERVER, EmpathyCallObserver))
+#define EMPATHY_CALL_OBSERVER_CLASS(k)     (G_TYPE_CHECK_CLASS_CAST((k), EMPATHY_TYPE_CALL_OBSERVER, EmpathyCallObserverClass))
+#define EMPATHY_IS_CALL_OBSERVER(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), EMPATHY_TYPE_CALL_OBSERVER))
+#define EMPATHY_IS_CALL_OBSERVER_CLASS(k)  (G_TYPE_CHECK_CLASS_TYPE ((k), EMPATHY_TYPE_CALL_OBSERVER))
+#define EMPATHY_CALL_OBSERVER_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), EMPATHY_TYPE_CALL_OBSERVER, EmpathyCallObserverClass))
+
+typedef struct _EmpathyCallObserver      EmpathyCallObserver;
+typedef struct _EmpathyCallObserverPriv  EmpathyCallObserverPriv;
+typedef struct _EmpathyCallObserverClass EmpathyCallObserverClass;
+
+struct _EmpathyCallObserver {
+  GObject parent;
+  EmpathyCallObserverPriv *priv;
+};
+
+struct _EmpathyCallObserverClass {
+  GObjectClass parent_class;
+};
+
+GType empathy_call_observer_get_type (void) G_GNUC_CONST;
+EmpathyCallObserver *empathy_call_observer_dup_singleton (void);
+
+G_END_DECLS
+
+#endif /* __EMPATHY_CALL_OBSERVER_H__ */
diff --git a/src/empathy-main-window.c b/src/empathy-main-window.c
index 8e3f2d8..8f08f74 100644
--- a/src/empathy-main-window.c
+++ b/src/empathy-main-window.c
@@ -64,6 +64,7 @@
 #include <libempathy-gtk/empathy-ui-utils.h>
 
 #include "empathy-accounts-dialog.h"
+#include "empathy-call-observer.h"
 #include "empathy-chat-manager.h"
 #include "empathy-main-window.h"
 #include "empathy-preferences.h"
@@ -107,7 +108,8 @@ struct _EmpathyMainWindowPriv {
 	TpAccountManager        *account_manager;
 	EmpathyChatroomManager  *chatroom_manager;
 	EmpathyEventManager     *event_manager;
-	EmpathySoundManager     *sound_mgr;;
+	EmpathySoundManager     *sound_mgr;
+	EmpathyCallObserver     *call_observer;
 	guint                    flash_timeout_id;
 	gboolean                 flash_on;
 	gboolean                 empty;
@@ -873,6 +875,7 @@ empathy_main_window_finalize (GObject *window)
 	g_signal_handlers_disconnect_by_func (priv->event_manager,
 			  		      main_window_event_removed_cb,
 			  		      window);
+	g_object_unref (priv->call_observer);
 	g_object_unref (priv->event_manager);
 	g_object_unref (priv->ui_manager);
 	g_object_unref (priv->chatroom_manager);
@@ -1930,6 +1933,7 @@ empathy_main_window_init (EmpathyMainWindow *window)
 	empathy_geometry_bind (GTK_WINDOW (window), GEOMETRY_NAME);
 
 	/* Enable event handling */
+	priv->call_observer = empathy_call_observer_dup_singleton ();
 	priv->event_manager = empathy_event_manager_dup_singleton ();
 
 	g_signal_connect (priv->event_manager, "event-added",
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