[gdm/wip/slave-connection: 23/29] daemon: Port GdmManager to GDBus



commit 2f0087f3f8a8adba3d4802c9efd9556cb8aed306
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Tue May 15 18:16:19 2012 +0200

    daemon: Port GdmManager to GDBus
    
    The GdmManager object controls the GdmLocalDisplayFactory and
    GdmXdmcpDisplayFactory singleton objects, which manage displays on local
    VTs and displays on remote machines respectively.
    
    Another role of the GdmManager object is to aggregate and export the
    displays currently being managed by those display factories over the
    system bus.
    
    This commit moves GdmManager over to using GDBus and the
    GDBusObjectManager interface for display enumeration.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=622888

 daemon/Makefile.am     |    5 -
 daemon/gdm-display.c   |    4 +-
 daemon/gdm-manager.c   |   34 ++++---
 daemon/gdm-manager.xml |   14 ---
 daemon/main.c          |  258 +++++++++++++++---------------------------------
 daemon/test-session.c  |    3 +-
 6 files changed, 103 insertions(+), 215 deletions(-)
---
diff --git a/daemon/Makefile.am b/daemon/Makefile.am
index a9205c6..0fe2f1f 100644
--- a/daemon/Makefile.am
+++ b/daemon/Makefile.am
@@ -31,7 +31,6 @@ AM_CPPFLAGS = \
 BUILT_SOURCES =					\
 	gdm-slave-glue.h			\
 	gdm-xdmcp-chooser-slave-glue.h		\
-	gdm-manager-glue.h			\
 	gdm-display-glue.h			\
 	gdm-xdmcp-display-glue.h		\
 	gdm-static-display-glue.h		\
@@ -41,9 +40,6 @@ BUILT_SOURCES =					\
 	gdm-session-glue.h			\
 	$(NULL)
 
-gdm-manager-glue.h: gdm-manager.xml Makefile.am
-	dbus-binding-tool --prefix=gdm_manager --mode=glib-server --output=gdm-manager-glue.h $(srcdir)/gdm-manager.xml
-
 gdm-display-glue.c gdm-display-glue.h: gdm-display.xml Makefile.am
 	$(AM_V_GEN)gdbus-codegen 					\
 		--c-namespace=GdmDBus					\
@@ -392,7 +388,6 @@ EXTRA_DIST = 				\
 	gdm-slave.xml			\
 	gdm-simple-slave.xml		\
 	gdm-xdmcp-chooser-slave.xml	\
-	gdm-manager.xml			\
 	gdm-display.xml			\
 	gdm-xdmcp-display.xml		\
 	gdm-static-display.xml		\
diff --git a/daemon/gdm-display.c b/daemon/gdm-display.c
index 017347d..f51819d 100644
--- a/daemon/gdm-display.c
+++ b/daemon/gdm-display.c
@@ -1207,7 +1207,7 @@ register_display (GdmDisplay *display)
 }
 
 /*
-  dbus-send --system --print-reply --dest=org.gnome.DisplayManager /org/gnome/DisplayManager/Display1 org.freedesktop.DBus.Introspectable.Introspect
+  dbus-send --system --print-reply --dest=org.gnome.DisplayManager /org/gnome/DisplayManager/Displays/1 org.freedesktop.DBus.Introspectable.Introspect
 */
 
 static GObject *
@@ -1223,7 +1223,7 @@ gdm_display_constructor (GType                  type,
                                                                                        construct_properties));
 
         g_free (display->priv->id);
-        display->priv->id = g_strdup_printf ("/org/gnome/DisplayManager/Display%u", get_next_display_serial ());
+        display->priv->id = g_strdup_printf ("/org/gnome/DisplayManager/Displays/%u", get_next_display_serial ());
 
         res = register_display (display);
         if (! res) {
diff --git a/daemon/gdm-manager.c b/daemon/gdm-manager.c
index 6cc38e4..c0bdc5c 100644
--- a/daemon/gdm-manager.c
+++ b/daemon/gdm-manager.c
@@ -33,14 +33,10 @@
 #include <glib/gi18n.h>
 #include <glib/gstdio.h>
 #include <glib-object.h>
-#define DBUS_API_SUBJECT_TO_CHANGE
-#include <dbus/dbus-glib.h>
-#include <dbus/dbus-glib-lowlevel.h>
 
 #include "gdm-common.h"
 
 #include "gdm-manager.h"
-#include "gdm-manager-glue.h"
 #include "gdm-display-store.h"
 #include "gdm-display-factory.h"
 #include "gdm-local-display-factory.h"
@@ -49,7 +45,7 @@
 #define GDM_MANAGER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GDM_TYPE_MANAGER, GdmManagerPrivate))
 
 #define GDM_DBUS_PATH         "/org/gnome/DisplayManager"
-#define GDM_MANAGER_DBUS_PATH GDM_DBUS_PATH "/Manager"
+#define GDM_MANAGER_DBUS_PATH GDM_DBUS_PATH "/Displays"
 #define GDM_MANAGER_DBUS_NAME "org.gnome.DisplayManager.Manager"
 
 struct GdmManagerPrivate
@@ -65,7 +61,9 @@ struct GdmManagerPrivate
         gboolean                wait_for_go;
         gboolean                no_console;
 
-        DBusGConnection        *connection;
+        GDBusProxy               *bus_proxy;
+        GDBusConnection          *connection;
+        GDBusObjectManagerServer *object_manager;
 };
 
 enum {
@@ -99,6 +97,8 @@ on_display_removed (GdmDisplayStore *display_store,
         display = gdm_display_store_lookup (display_store, id);
 
         if (display != NULL) {
+                g_dbus_object_manager_server_unexport (manager->priv->object_manager, id);
+
                 g_signal_emit (manager, signals[DISPLAY_REMOVED], 0, id);
         }
 }
@@ -113,6 +113,8 @@ on_display_added (GdmDisplayStore *display_store,
         display = gdm_display_store_lookup (display_store, id);
 
         if (display != NULL) {
+                g_dbus_object_manager_server_export (manager->priv->object_manager,
+                                                     gdm_display_get_object_skeleton (display));
                 g_signal_emit (manager, signals[DISPLAY_ADDED], 0, id);
         }
 }
@@ -143,8 +145,8 @@ listify_display_ids (const char *id,
   Example:
   dbus-send --system --dest=org.gnome.DisplayManager \
   --type=method_call --print-reply --reply-timeout=2000 \
-  /org/gnome/DisplayManager/Manager \
-  org.gnome.DisplayManager.Manager.GetDisplays
+  /org/gnome/DisplayManager/Displays \
+  org.freedesktop.ObjectManager.GetAll
 */
 gboolean
 gdm_manager_get_displays (GdmManager *manager,
@@ -230,18 +232,19 @@ static gboolean
 register_manager (GdmManager *manager)
 {
         GError *error = NULL;
+        GDBusObjectManagerServer *object_server;
 
         error = NULL;
-        manager->priv->connection = dbus_g_bus_get (DBUS_BUS_SYSTEM, &error);
+        manager->priv->connection = g_bus_get_sync (G_BUS_TYPE_SYSTEM, NULL, &error);
         if (manager->priv->connection == NULL) {
-                if (error != NULL) {
-                        g_critical ("error getting system bus: %s", error->message);
-                        g_error_free (error);
-                }
+                g_critical ("error getting system bus: %s", error->message);
+                g_error_free (error);
                 exit (1);
         }
 
-        dbus_g_connection_register_g_object (manager->priv->connection, GDM_MANAGER_DBUS_PATH, G_OBJECT (manager));
+        object_server = g_dbus_object_manager_server_new (GDM_MANAGER_DBUS_PATH);
+        g_dbus_object_manager_server_set_connection (object_server, manager->priv->connection);
+        manager->priv->object_manager = object_server;
 
         return TRUE;
 }
@@ -375,8 +378,6 @@ gdm_manager_class_init (GdmManagerClass *klass)
                                                                G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 
         g_type_class_add_private (klass, sizeof (GdmManagerPrivate));
-
-        dbus_g_object_type_install_info (GDM_TYPE_MANAGER, &dbus_glib_gdm_manager_object_info);
 }
 
 static void
@@ -415,6 +416,7 @@ gdm_manager_finalize (GObject *object)
 #endif
         g_clear_object (&manager->priv->local_factory);
         g_clear_object (&manager->priv->connection);
+        g_clear_object (&manager->priv->object_manager);
 
         gdm_display_store_clear (manager->priv->display_store);
 
diff --git a/daemon/main.c b/daemon/main.c
index ea34533..0255c53 100644
--- a/daemon/main.c
+++ b/daemon/main.c
@@ -38,10 +38,7 @@
 #include <glib/gi18n.h>
 #include <glib/gstdio.h>
 #include <glib-object.h>
-
-#define DBUS_API_SUBJECT_TO_CHANGE
-#include <dbus/dbus-glib.h>
-#include <dbus/dbus-glib-lowlevel.h>
+#include <gio/gio.h>
 
 #include "gdm-manager.h"
 #include "gdm-log.h"
@@ -54,12 +51,13 @@
 
 #define GDM_DBUS_NAME "org.gnome.DisplayManager"
 
-static void bus_proxy_destroyed_cb (DBusGProxy  *bus_proxy,
-                                    GdmManager **managerp);
+static GDBusConnection *get_system_bus (void);
+static gboolean         bus_reconnect (void);
 
 extern char **environ;
 
 static GdmManager      *manager       = NULL;
+static int              name_id       = -1;
 static GdmSettings     *settings      = NULL;
 static uid_t            gdm_uid       = -1;
 static gid_t            gdm_gid       = -1;
@@ -71,76 +69,29 @@ timed_exit_cb (GMainLoop *loop)
         return FALSE;
 }
 
-static DBusGProxy *
-get_bus_proxy (DBusGConnection *connection)
-{
-        DBusGProxy *bus_proxy;
-
-        bus_proxy = dbus_g_proxy_new_for_name (connection,
-                                               DBUS_SERVICE_DBUS,
-                                               DBUS_PATH_DBUS,
-                                               DBUS_INTERFACE_DBUS);
-        return bus_proxy;
-}
-
-static gboolean
-acquire_name_on_proxy (DBusGProxy *bus_proxy)
+static void
+bus_connection_closed (void)
 {
-        GError     *error;
-        guint       result;
-        gboolean    res;
-        gboolean    ret;
-
-        ret = FALSE;
-
-        if (bus_proxy == NULL) {
-                goto out;
-        }
-
-        error = NULL;
-        res = dbus_g_proxy_call (bus_proxy,
-                                 "RequestName",
-                                 &error,
-                                 G_TYPE_STRING, GDM_DBUS_NAME,
-                                 G_TYPE_UINT, 0,
-                                 G_TYPE_INVALID,
-                                 G_TYPE_UINT, &result,
-                                 G_TYPE_INVALID);
-        if (! res) {
-                if (error != NULL) {
-                        g_warning ("Failed to acquire %s: %s", GDM_DBUS_NAME, error->message);
-                        g_error_free (error);
-                } else {
-                        g_warning ("Failed to acquire %s", GDM_DBUS_NAME);
-                }
-                goto out;
-        }
+        g_debug ("Disconnected from D-Bus");
 
-        if (result != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
-                if (error != NULL) {
-                        g_warning ("Failed to acquire %s: %s", GDM_DBUS_NAME, error->message);
-                        g_error_free (error);
-                } else {
-                        g_warning ("Failed to acquire %s", GDM_DBUS_NAME);
-                }
-                goto out;
+        if (manager == NULL) {
+                /* probably shutting down or something */
+                return;
         }
 
-        ret = TRUE;
+        g_clear_object (&manager);
 
- out:
-        return ret;
+        g_timeout_add_seconds (3, (GSourceFunc)bus_reconnect, NULL);
 }
 
-static DBusGConnection *
+static GDBusConnection *
 get_system_bus (void)
 {
         GError          *error;
-        DBusGConnection *bus;
-        DBusConnection  *connection;
+        GDBusConnection *bus;
 
         error = NULL;
-        bus = dbus_g_bus_get (DBUS_BUS_SYSTEM, &error);
+        bus = g_bus_get_sync (G_BUS_TYPE_SYSTEM, NULL, &error);
         if (bus == NULL) {
                 g_warning ("Couldn't connect to system bus: %s",
                            error->message);
@@ -148,76 +99,14 @@ get_system_bus (void)
                 goto out;
         }
 
-        connection = dbus_g_connection_get_connection (bus);
-        dbus_connection_set_exit_on_disconnect (connection, FALSE);
+        g_signal_connect (bus, "closed",
+                          G_CALLBACK (bus_connection_closed), NULL);
+        g_dbus_connection_set_exit_on_close (bus, FALSE);
 
  out:
         return bus;
 }
 
-static gboolean
-bus_reconnect (GdmManager *manager)
-{
-        DBusGConnection *bus;
-        DBusGProxy      *bus_proxy;
-        gboolean         ret;
-
-        ret = TRUE;
-
-        bus = get_system_bus ();
-        if (bus == NULL) {
-                goto out;
-        }
-
-        bus_proxy = get_bus_proxy (bus);
-        if (bus_proxy == NULL) {
-                g_warning ("Could not construct bus_proxy object; will retry");
-                goto out;
-        }
-
-        if (! acquire_name_on_proxy (bus_proxy) ) {
-                g_warning ("Could not acquire name; will retry");
-                goto out;
-        }
-
-        manager = gdm_manager_new ();
-        if (manager == NULL) {
-                g_warning ("Could not construct manager object");
-                exit (1);
-        }
-
-        g_signal_connect (bus_proxy,
-                          "destroy",
-                          G_CALLBACK (bus_proxy_destroyed_cb),
-                          &manager);
-
-        g_debug ("Successfully reconnected to D-Bus");
-
-        gdm_manager_start (manager);
-
-        ret = FALSE;
-
- out:
-        return ret;
-}
-
-static void
-bus_proxy_destroyed_cb (DBusGProxy  *bus_proxy,
-                        GdmManager **managerp)
-{
-        g_debug ("Disconnected from D-Bus");
-
-        if (managerp == NULL || *managerp == NULL) {
-                /* probably shutting down or something */
-                return;
-        }
-
-        g_object_unref (*managerp);
-        *managerp = NULL;
-
-        g_timeout_add_seconds (3, (GSourceFunc)bus_reconnect, managerp);
-}
-
 static void
 delete_pid (void)
 {
@@ -527,12 +416,9 @@ main (int    argc,
 {
         GMainLoop          *main_loop;
         GOptionContext     *context;
-        DBusGProxy         *bus_proxy;
-        DBusGConnection    *connection;
         GError             *error;
         int                 ret;
         gboolean            res;
-        gboolean            xdmcp_enabled;
         GdmSignalHandler   *signal_handler;
         static gboolean     do_timed_exit    = FALSE;
         static gboolean     print_version    = FALSE;
@@ -579,22 +465,6 @@ main (int    argc,
                 g_log_set_always_fatal (fatal_mask);
         }
 
-        connection = get_system_bus ();
-        if (connection == NULL) {
-                goto out;
-        }
-
-        bus_proxy = get_bus_proxy (connection);
-        if (bus_proxy == NULL) {
-                g_warning ("Could not construct bus_proxy object; bailing out");
-                goto out;
-        }
-
-        if (! acquire_name_on_proxy (bus_proxy) ) {
-                g_warning ("Could not acquire name; bailing out");
-                goto out;
-        }
-
         gdm_log_init ();
 
         settings = gdm_settings_new ();
@@ -623,27 +493,15 @@ main (int    argc,
                 exit (-1);
         }
 
+        /* Connect to the bus, own the name and start the manager */
+        bus_reconnect ();
+
         /* pid file */
         delete_pid ();
         write_pid ();
 
         g_chdir (AUTHDIR);
 
-        manager = gdm_manager_new ();
-
-        if (manager == NULL) {
-                goto out;
-        }
-
-        xdmcp_enabled = FALSE;
-        gdm_settings_direct_get_boolean (GDM_KEY_XDMCP_ENABLE, &xdmcp_enabled);
-        gdm_manager_set_xdmcp_enabled (manager, xdmcp_enabled);
-
-        g_signal_connect (bus_proxy,
-                          "destroy",
-                          G_CALLBACK (bus_proxy_destroyed_cb),
-                          &manager);
-
         main_loop = g_main_loop_new (NULL, FALSE);
 
         signal_handler = gdm_signal_handler_new ();
@@ -661,23 +519,13 @@ main (int    argc,
                 g_timeout_add_seconds (30, (GSourceFunc) timed_exit_cb, main_loop);
         }
 
-        gdm_manager_start (manager);
-
         g_main_loop_run (main_loop);
 
         g_debug ("GDM finished, cleaning up...");
 
-        if (manager != NULL) {
-                g_object_unref (manager);
-        }
-
-        if (settings != NULL) {
-                g_object_unref (settings);
-        }
-
-        if (signal_handler != NULL) {
-                g_object_unref (signal_handler);
-        }
+        g_clear_object (&manager);
+        g_clear_object (&settings);
+        g_clear_object (&signal_handler);
 
         gdm_settings_direct_shutdown ();
         gdm_log_shutdown ();
@@ -690,3 +538,61 @@ main (int    argc,
 
         return ret;
 }
+
+static void
+on_name_acquired (GDBusConnection *bus,
+                  const char      *name,
+                  gpointer         user_data)
+{
+        gboolean xdmcp_enabled;
+
+        manager = gdm_manager_new ();
+        if (manager == NULL) {
+                g_warning ("Could not construct manager object");
+                exit (1);
+        }
+
+        g_debug ("Successfully connected to D-Bus");
+
+        gdm_manager_start (manager);
+
+        xdmcp_enabled = FALSE;
+        gdm_settings_direct_get_boolean (GDM_KEY_XDMCP_ENABLE, &xdmcp_enabled);
+        gdm_manager_set_xdmcp_enabled (manager, xdmcp_enabled);
+}
+
+static void
+on_name_lost (GDBusConnection *bus,
+              const char      *name,
+              gpointer         user_data)
+{
+        g_debug ("Lost GDM name on bus");
+
+        bus_connection_closed ();
+}
+
+static gboolean
+bus_reconnect ()
+{
+        GDBusConnection *bus;
+        gboolean         ret;
+
+        ret = TRUE;
+
+        bus = get_system_bus ();
+        if (bus == NULL) {
+                goto out;
+        }
+
+        name_id = g_bus_own_name_on_connection (bus,
+                                                GDM_DBUS_NAME,
+                                                G_BUS_NAME_OWNER_FLAGS_NONE,
+                                                on_name_acquired,
+                                                on_name_lost,
+                                                NULL,
+                                                NULL);
+
+        ret = FALSE;
+ out:
+        return ret;
+}
diff --git a/daemon/test-session.c b/daemon/test-session.c
index 5b838bd..31be1ec 100644
--- a/daemon/test-session.c
+++ b/daemon/test-session.c
@@ -246,8 +246,7 @@ main (int   argc,
         g_type_init ();
 
         do {
-                g_debug ("creating instance of GdmSession object...");
-                session = gdm_session_new ("/org/gnome/DisplayManager/Display1",
+                session = gdm_session_new ("/org/gnome/DisplayManager/Displays/1",
                                            ":0",
                                            g_get_host_name (),
                                            ttyname (STDIN_FILENO),



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