libgdb: Try to reuse connections from the available proxies

Instead of using the hard-to-maintain shared pointer to the dbus connection
to the manager and reset it when the proxies that use it are deleted, just
look which proxy is currently available and try to reuse the connection
from it.

Fixes #386

1 files changed, 39 insertions, 31 deletions

diff --git a/libgdm/gdm-client.c b/libgdm/gdm-client.c
index 7b42b6c9..acf016a4 100644
--- a/libgdm/gdm-client.c
+++ b/libgdm/gdm-client.c
@@ -46,7 +46,6 @@ struct GdmClientPrivate
         GdmGreeter         *greeter;
         GdmRemoteGreeter   *remote_greeter;
         GdmChooser         *chooser;
-        GDBusConnection    *connection;
         char               *address;
 
         char              **enabled_extensions;
@@ -71,6 +70,28 @@ gdm_client_error_quark (void)
         return error_quark;
 }
 
+static GDBusConnection *
+gdm_client_get_open_connection (GdmClient *client)
+{
+        GDBusProxy *proxy = NULL;
+
+        if (client->priv->user_verifier != NULL) {
+                proxy = G_DBUS_PROXY (client->priv->user_verifier);
+        } else if (client->priv->greeter != NULL) {
+                proxy = G_DBUS_PROXY (client->priv->greeter);
+        } else if (client->priv->remote_greeter != NULL) {
+                proxy = G_DBUS_PROXY (client->priv->remote_greeter);
+        } else if (client->priv->chooser != NULL) {
+                proxy = G_DBUS_PROXY (client->priv->chooser);
+        }
+
+        if (proxy != NULL) {
+                return g_dbus_proxy_get_connection (proxy);
+        }
+
+        return NULL;
+}
+
 static void
 on_got_manager (GObject             *object,
                 GAsyncResult        *result,
@@ -399,12 +420,15 @@ gdm_client_get_connection_sync (GdmClient      *client,
                                 GError        **error)
 {
         g_autoptr(GdmManager) manager = NULL;
+        GDBusConnection *connection;
         gboolean ret;
 
         g_return_val_if_fail (GDM_IS_CLIENT (client), FALSE);
 
-        if (client->priv->connection != NULL) {
-                return g_object_ref (client->priv->connection);
+        connection = gdm_client_get_open_connection (client);
+
+        if (connection != NULL) {
+                return g_object_ref (connection);
         }
 
         manager = gdm_manager_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
@@ -429,23 +453,19 @@ gdm_client_get_connection_sync (GdmClient      *client,
 
         g_debug ("GdmClient: connecting to address: %s", client->priv->address);
 
-        client->priv->connection = g_dbus_connection_new_for_address_sync (client->priv->address,
-                                                                           G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT,
-                                                                           NULL,
-                                                                           cancellable,
-                                                                           error);
+        connection = g_dbus_connection_new_for_address_sync (client->priv->address,
+                                                             G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT,
+                                                             NULL,
+                                                             cancellable,
+                                                             error);
 
-        if (client->priv->connection == NULL) {
+        if (connection == NULL) {
                 g_clear_pointer (&client->priv->address, g_free);
                 goto out;
         }
 
-        g_object_add_weak_pointer (G_OBJECT (client->priv->connection),
-                                   (gpointer *)
-                                   &client->priv->connection);
-
  out:
-        return client->priv->connection;
+        return connection;
 }
 
 static void
@@ -545,12 +565,6 @@ gdm_client_get_connection_finish (GdmClient      *client,
                 return NULL;
         }
 
-        if (client->priv->connection == NULL) {
-                client->priv->connection = connection;
-                g_object_add_weak_pointer (G_OBJECT (client->priv->connection),
-                                           (gpointer *) &client->priv->connection);
-        }
-
         return connection;
 }
 
@@ -561,6 +575,7 @@ gdm_client_get_connection (GdmClient           *client,
                             gpointer             user_data)
 {
         GTask *task;
+        GDBusConnection *connection;
 
         g_return_if_fail (GDM_IS_CLIENT (client));
 
@@ -569,9 +584,10 @@ gdm_client_get_connection (GdmClient           *client,
                            callback,
                            user_data);
 
-        if (client->priv->connection != NULL) {
+        connection = gdm_client_get_open_connection (client);
+        if (connection != NULL) {
             g_task_return_pointer (task,
-                                   g_object_ref (client->priv->connection),
+                                   g_object_ref (connection),
                                    (GDestroyNotify) g_object_unref);
             g_object_unref (task);
             return;
@@ -775,7 +791,7 @@ gdm_client_get_user_verifier_sync (GdmClient     *client,
                                             if (strcmp (client->priv->enabled_extensions[i],
                                                         gdm_user_verifier_choice_list_interface_info ()->name) == 0) {
                                                         GdmUserVerifierChoiceList *choice_list_interface;
-                                                        choice_list_interface = gdm_user_verifier_choice_list_proxy_new_sync (client->priv->connection,
+                                                        choice_list_interface = gdm_user_verifier_choice_list_proxy_new_sync (connection,
                                                                                                                               G_DBUS_PROXY_FLAGS_NONE,
                                                                                                                               NULL,
                                                                                                                               SESSION_DBUS_PATH,
@@ -1509,14 +1525,6 @@ gdm_client_finalize (GObject *object)
                                               &client->priv->chooser);
         }
 
-        if (client->priv->connection != NULL) {
-                g_object_remove_weak_pointer (G_OBJECT (client->priv->connection),
-                                              (gpointer *)
-                                              &client->priv->connection);
-        }
-
-        g_clear_object (&client->priv->connection);
-
         g_strfreev (client->priv->enabled_extensions);
         g_free (client->priv->address);