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[gnome-settings-daemon/wip/gnome-session-isactive] [wip] Port to gnome-session's SessionIsActive property

commit c2f2c3ecad0d13bab931fc60e3b84c6bbf0b9187
Author: Colin Walters <walters verbum org>
Date:   Tue Nov 6 17:47:05 2012 -0500

    [wip] Port to gnome-session's SessionIsActive property
    
    Rather than maintaining the systemd code here, monitor gnome-session's
    SessionIsActive property.  This allows us to drop the compile-time
    dependency on systemd.
    
    The power plugin is declared dependent on systemd at runtime, but the
    rest of the code should operate in more "basic functionality" mode.

 configure.ac                                   |    3 +-
 gnome-settings-daemon/gnome-settings-session.c |  233 ------------------------
 gnome-settings-daemon/gnome-settings-session.h |   32 ----
 plugins/automount/gsd-automount-manager.c      |   25 ++--
 plugins/color/gsd-color-manager.c              |   32 ++--
 plugins/power/gsd-power-manager.c              |   23 ++-
 6 files changed, 47 insertions(+), 301 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 7ebefe0..0128a6f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -63,7 +63,6 @@ PKG_CHECK_MODULES(SETTINGS_DAEMON,
         gmodule-2.0
         gthread-2.0
 	gsettings-desktop-schemas >= 3.5.90
-	libsystemd-login
 )
 
 PKG_CHECK_MODULES(SETTINGS_PLUGIN,
@@ -228,7 +227,7 @@ PKG_CHECK_MODULES(SOUND, [libpulse >= $PA_REQUIRED_VERSION $GUDEV_PKG libpulse-m
 # ---------------------------------------------------------------------------
 # Power
 # ---------------------------------------------------------------------------
-PKG_CHECK_MODULES(POWER, upower-glib >= $UPOWER_REQUIRED_VERSION gnome-desktop-3.0 >= $GNOME_DESKTOP_REQUIRED_VERSION libcanberra-gtk3 libnotify x11 xext)
+PKG_CHECK_MODULES(POWER, libsystemd-login upower-glib >= $UPOWER_REQUIRED_VERSION gnome-desktop-3.0 >= $GNOME_DESKTOP_REQUIRED_VERSION libcanberra-gtk3 libnotify x11 xext)
 
 if test x$have_gudev != xno; then
 	PKG_CHECK_MODULES(BACKLIGHT_HELPER,
diff --git a/gnome-settings-daemon/gnome-settings-session.c b/gnome-settings-daemon/gnome-settings-session.c
index e404a34..226c12b 100644
--- a/gnome-settings-daemon/gnome-settings-session.c
+++ b/gnome-settings-daemon/gnome-settings-session.c
@@ -30,239 +30,6 @@
 
 #include "gnome-settings-session.h"
 
-typedef struct
-{
-  GSource source;
-  GPollFD pollfd;
-  sd_login_monitor *monitor;
-} SdSource;
-
-static gboolean
-sd_source_prepare (GSource *source,
-                   gint    *timeout)
-{
-  *timeout = -1;
-  return FALSE;
-}
-
-static gboolean
-sd_source_check (GSource *source)
-{
-  SdSource *sd_source = (SdSource *)source;
-
-  return sd_source->pollfd.revents != 0;
-}
-
-static gboolean
-sd_source_dispatch (GSource     *source,
-                    GSourceFunc  callback,
-                    gpointer     user_data)
-
-{
-  SdSource *sd_source = (SdSource *)source;
-  gboolean ret;
-
-  g_warn_if_fail (callback != NULL);
-
-  ret = (*callback) (user_data);
-
-  sd_login_monitor_flush (sd_source->monitor);
-  return ret;
-}
-
-static void
-sd_source_finalize (GSource *source)
-{
-  SdSource *sd_source = (SdSource*)source;
-
-  sd_login_monitor_unref (sd_source->monitor);
-}
-
-static GSourceFuncs sd_source_funcs = {
-  sd_source_prepare,
-  sd_source_check,
-  sd_source_dispatch,
-  sd_source_finalize
-};
-
-static GSource *
-sd_source_new (void)
-{
-  GSource *source;
-  SdSource *sd_source;
-  int ret;
-
-  source = g_source_new (&sd_source_funcs, sizeof (SdSource));
-  sd_source = (SdSource *)source;
-
-  if ((ret = sd_login_monitor_new (NULL, &sd_source->monitor)) < 0)
-    {
-      g_printerr ("Error getting login monitor: %d", ret);
-    }
-  else
-    {
-      sd_source->pollfd.fd = sd_login_monitor_get_fd (sd_source->monitor);
-      sd_source->pollfd.events = G_IO_IN;
-      g_source_add_poll (source, &sd_source->pollfd);
-    }
-
-  return source;
-}
-
-static void gnome_settings_session_finalize (GObject *object);
-
-#define GNOME_SETTINGS_SESSION_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GNOME_TYPE_SETTINGS_SESSION, GnomeSettingsSessionPrivate))
-
-struct GnomeSettingsSessionPrivate
-{
-        GSource                   *sd_source;
-	gchar                     *session_id;
-	GnomeSettingsSessionState  state;
-};
-
-enum {
-	PROP_0,
-	PROP_STATE,
-	PROP_LAST
-};
-
-G_DEFINE_TYPE (GnomeSettingsSession, gnome_settings_session, G_TYPE_OBJECT)
-
-GnomeSettingsSessionState
-gnome_settings_session_get_state (GnomeSettingsSession *session)
-{
-	g_return_val_if_fail (GNOME_IS_SETTINGS_SESSION (session),
-			      GNOME_SETTINGS_SESSION_STATE_UNKNOWN);
-	return session->priv->state;
-}
-
-static void
-gnome_settings_session_set_state (GnomeSettingsSession *session,
-				  gboolean active)
-{
-        GnomeSettingsSessionState  state;
-
-        state = active ? GNOME_SETTINGS_SESSION_STATE_ACTIVE
-                       : GNOME_SETTINGS_SESSION_STATE_INACTIVE;
-        if (session->priv->state != state) {
-                session->priv->state = state;
-                g_object_notify (G_OBJECT (session), "state");
-        }
-}
-
-static void
-gnome_settings_session_get_property (GObject *object,
-				     guint prop_id,
-				     GValue *value,
-				     GParamSpec *pspec)
-{
-	GnomeSettingsSession *session = GNOME_SETTINGS_SESSION (object);
-
-	switch (prop_id) {
-	case PROP_STATE:
-		g_value_set_enum (value, session->priv->state);
-		break;
-	default:
-		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
-		break;
-	}
-}
-
-GType
-gnome_settings_session_state_get_type (void)
-{
-	static GType etype = 0;
-	if (etype == 0) {
-		static const GEnumValue values[] = {
-			{ GNOME_SETTINGS_SESSION_STATE_UNKNOWN,
-			  "unknown", "Unknown" },
-			{ GNOME_SETTINGS_SESSION_STATE_ACTIVE,
-			  "active", "Active" },
-			{ GNOME_SETTINGS_SESSION_STATE_INACTIVE,
-			  "inactive", "Inactive" },
-			{ 0, NULL, NULL }
-			};
-		etype = g_enum_register_static ("GnomeSettingsSessionState", values);
-	}
-	return etype;
-}
-
-static void
-gnome_settings_session_class_init (GnomeSettingsSessionClass *klass)
-{
-	GObjectClass *object_class = G_OBJECT_CLASS (klass);
-	object_class->get_property = gnome_settings_session_get_property;
-	object_class->finalize = gnome_settings_session_finalize;
-	g_type_class_add_private (klass, sizeof (GnomeSettingsSessionPrivate));
-
-	g_object_class_install_property (object_class,
-					 PROP_STATE,
-					 g_param_spec_enum ("state",
-							    "The session state",
-							    NULL,
-							    GNOME_TYPE_SETTINGS_SESSION_STATE,
-							    GNOME_SETTINGS_SESSION_STATE_UNKNOWN,
-							    G_PARAM_READABLE));
-}
-
-static gboolean
-sessions_changed (gpointer user_data)
-{
-        GnomeSettingsSession *session = user_data;
-        gboolean active;
-
-        active = sd_session_is_active (session->priv->session_id);
-        gnome_settings_session_set_state (session, active);
-
-        return TRUE;
-}
-
-static void
-gnome_settings_session_init (GnomeSettingsSession *session)
-{
-	session->priv = GNOME_SETTINGS_SESSION_GET_PRIVATE (session);
-
-        sd_pid_get_session (getpid(), &session->priv->session_id);
-
-        session->priv->sd_source = sd_source_new ();
-        g_source_set_callback (session->priv->sd_source, sessions_changed, session, NULL);
-        g_source_attach (session->priv->sd_source, NULL);
-
-        sessions_changed (session);
-}
-
-static void
-gnome_settings_session_finalize (GObject *object)
-{
-	GnomeSettingsSession *session;
-
-	session = GNOME_SETTINGS_SESSION (object);
-
-        g_free (session->priv->session_id);
-
-        if (session->priv->sd_source != NULL) {
-                g_source_destroy (session->priv->sd_source);
-                g_source_unref (session->priv->sd_source);
-        }
-
-	G_OBJECT_CLASS (gnome_settings_session_parent_class)->finalize (object);
-}
-
-static GnomeSettingsSession *session;
-
-GnomeSettingsSession *
-gnome_settings_session_new (void)
-{
-        if (session != NULL) {
-                g_object_ref (session);
-        } else {
-                session = g_object_new (GNOME_TYPE_SETTINGS_SESSION, NULL);
-                g_object_add_weak_pointer ((GObject*)session, (gpointer*)&session);
-        }
-
-	return session;
-}
-
 #define GNOME_SESSION_DBUS_NAME      "org.gnome.SessionManager"
 #define GNOME_SESSION_DBUS_OBJECT    "/org/gnome/SessionManager"
 #define GNOME_SESSION_DBUS_INTERFACE "org.gnome.SessionManager"
diff --git a/gnome-settings-daemon/gnome-settings-session.h b/gnome-settings-daemon/gnome-settings-session.h
index 1f7580d..0c9a1b7 100644
--- a/gnome-settings-daemon/gnome-settings-session.h
+++ b/gnome-settings-daemon/gnome-settings-session.h
@@ -26,38 +26,6 @@
 
 G_BEGIN_DECLS
 
-#define GNOME_TYPE_SETTINGS_SESSION		(gnome_settings_session_get_type ())
-#define GNOME_SETTINGS_SESSION(o)		(G_TYPE_CHECK_INSTANCE_CAST ((o), GNOME_TYPE_SETTINGS_SESSION, GnomeSettingsSession))
-#define GNOME_SETTINGS_SESSION_CLASS(k)	(G_TYPE_CHECK_CLASS_CAST((k), GNOME_TYPE_SETTINGS_SESSION, GnomeSettingsSessionClass))
-#define GNOME_IS_SETTINGS_SESSION(o)		(G_TYPE_CHECK_INSTANCE_TYPE ((o), GNOME_TYPE_SETTINGS_SESSION))
-#define GNOME_IS_SETTINGS_SESSION_CLASS(k)	(G_TYPE_CHECK_CLASS_TYPE ((k), GNOME_TYPE_SETTINGS_SESSION))
-#define GNOME_SETTINGS_SESSION_GET_CLASS(o)	(G_TYPE_INSTANCE_GET_CLASS ((o), GNOME_TYPE_SETTINGS_SESSION, GnomeSettingsSessionClass))
-#define GNOME_TYPE_SETTINGS_SESSION_STATE	(gnome_settings_session_state_get_type())
-
-typedef struct GnomeSettingsSessionPrivate GnomeSettingsSessionPrivate;
-
-typedef struct
-{
-	 GObject			 parent;
-	 GnomeSettingsSessionPrivate	*priv;
-} GnomeSettingsSession;
-
-typedef struct
-{
-	GObjectClass	parent_class;
-} GnomeSettingsSessionClass;
-
-typedef enum {
-	GNOME_SETTINGS_SESSION_STATE_UNKNOWN,
-	GNOME_SETTINGS_SESSION_STATE_ACTIVE,
-	GNOME_SETTINGS_SESSION_STATE_INACTIVE,
-} GnomeSettingsSessionState;
-
-GType			 gnome_settings_session_get_type	(void);
-GType			 gnome_settings_session_state_get_type	(void);
-GnomeSettingsSession	*gnome_settings_session_new		(void);
-GnomeSettingsSessionState gnome_settings_session_get_state	(GnomeSettingsSession	*session);
-
 GDBusProxy              *gnome_settings_session_get_session_proxy  (void);
 
 G_END_DECLS
diff --git a/plugins/automount/gsd-automount-manager.c b/plugins/automount/gsd-automount-manager.c
index 7912f19..d1e0dd8 100644
--- a/plugins/automount/gsd-automount-manager.c
+++ b/plugins/automount/gsd-automount-manager.c
@@ -42,7 +42,7 @@ struct GsdAutomountManagerPrivate
 	GVolumeMonitor *volume_monitor;
 	unsigned int automount_idle_id;
 
-        GnomeSettingsSession *session;
+        GDBusProxy *session;
         gboolean session_is_active;
         gboolean screensaver_active;
         guint ss_watch_id;
@@ -288,17 +288,18 @@ mount_added_callback (GVolumeMonitor *monitor,
 
 
 static void
-session_state_changed (GnomeSettingsSession *session, GParamSpec *pspec, gpointer user_data)
+session_props_changed (GDBusProxy *session, char **props, gpointer user_data)
 {
         GsdAutomountManager *manager = user_data;
         GsdAutomountManagerPrivate *p = manager->priv;
+        GVariant *active_v = NULL;
 
-        if (gnome_settings_session_get_state (session) == GNOME_SETTINGS_SESSION_STATE_ACTIVE) {
-                p->session_is_active = TRUE;
-        }
-        else {
-                p->session_is_active = FALSE;
-        }
+        active_v = g_dbus_proxy_get_cached_property (session, "SessionIsActive");
+        if (!active_v)
+                return;
+
+        g_variant_get (active_v, "(b)", &p->session_is_active);
+        g_variant_unref (active_v);
 
         if (!p->session_is_active) {
                 if (p->volume_queue != NULL) {
@@ -311,10 +312,10 @@ session_state_changed (GnomeSettingsSession *session, GParamSpec *pspec, gpointe
 static void
 do_initialize_session (GsdAutomountManager *manager)
 {
-        manager->priv->session = gnome_settings_session_new ();
-        g_signal_connect (manager->priv->session, "notify::state",
-                          G_CALLBACK (session_state_changed), manager);
-        session_state_changed (manager->priv->session, NULL, manager);
+        manager->priv->session = gnome_settings_session_get_session_proxy ();
+        g_signal_connect (manager->priv->session, "g-properties-changed",
+                          G_CALLBACK (session_props_changed), manager);
+        session_props_changed (manager->priv->session, NULL, manager);
 }
 
 #define SCREENSAVER_NAME "org.gnome.ScreenSaver"
diff --git a/plugins/color/gsd-color-manager.c b/plugins/color/gsd-color-manager.c
index 999b88c..3586cf9 100644
--- a/plugins/color/gsd-color-manager.c
+++ b/plugins/color/gsd-color-manager.c
@@ -47,7 +47,7 @@
 
 struct GsdColorManagerPrivate
 {
-        GnomeSettingsSession *session;
+        GDBusProxy      *session;
         CdClient        *client;
         GSettings       *settings;
         GcmProfileStore *profile_store;
@@ -55,7 +55,7 @@ struct GsdColorManagerPrivate
         GnomeRRScreen   *x11_screen;
         GHashTable      *edid_cache;
         GdkWindow       *gdk_window;
-        GnomeSettingsSessionState session_state;
+        gboolean         session_is_active;
         GHashTable      *device_assign_hash;
 };
 
@@ -2213,17 +2213,25 @@ gcm_session_sensor_removed_cb (CdClient *client,
 }
 
 static void
-gcm_session_active_changed_cb (GnomeSettingsSession *session,
-                               GParamSpec *pspec,
+gcm_session_active_changed_cb (GDBusProxy      *session,
+                               char           **props,
                                GsdColorManager *manager)
 {
-        GnomeSettingsSessionState state_new;
         GsdColorManagerPrivate *priv = manager->priv;
+        GVariant *active_v = NULL;
+        gboolean is_active;
 
         /* not yet connected to the daemon */
         if (!cd_client_get_connected (priv->client))
                 return;
 
+        active_v = g_dbus_proxy_get_cached_property (session, "SessionIsActive");
+        if (!active_v)
+                return;
+
+        g_variant_get (active_v, "(b)", &is_active);
+        g_variant_unref (active_v);
+
         /* When doing the fast-user-switch into a new account, load the
          * new users chosen profiles.
          *
@@ -2231,15 +2239,13 @@ gcm_session_active_changed_cb (GnomeSettingsSession *session,
          * loaded, then we'll get a change from unknown to active
          * and we want to avoid reprobing the devices for that.
          */
-        state_new = gnome_settings_session_get_state (session);
-        if (priv->session_state != GNOME_SETTINGS_SESSION_STATE_UNKNOWN &&
-            state_new == GNOME_SETTINGS_SESSION_STATE_ACTIVE) {
+        if (is_active && !priv->session_is_active) {
                 g_warning ("Done switch to new account, reload devices");
                 cd_client_get_devices (manager->priv->client, NULL,
                                        gcm_session_get_devices_cb,
                                        manager);
         }
-        priv->session_state = state_new;
+        priv->session_is_active = is_active;
 }
 
 static void
@@ -2259,11 +2265,9 @@ gsd_color_manager_init (GsdColorManager *manager)
         priv = manager->priv = GSD_COLOR_MANAGER_GET_PRIVATE (manager);
 
         /* track the active session */
-        priv->session = gnome_settings_session_new ();
-        priv->session_state = gnome_settings_session_get_state (priv->session);
-        g_signal_connect (priv->session, "notify::state",
-                          G_CALLBACK (gcm_session_active_changed_cb),
-                          manager);
+        priv->session = gnome_settings_session_get_session_proxy ();
+        g_signal_connect (priv->session, "g-properties-changed",
+                          G_CALLBACK (gcm_session_active_changed_cb), manager);
 
         /* set the _ICC_PROFILE atoms on the root screen */
         priv->gdk_window = gdk_screen_get_root_window (gdk_screen_get_default ());
diff --git a/plugins/power/gsd-power-manager.c b/plugins/power/gsd-power-manager.c
index bf211f5..c841314 100644
--- a/plugins/power/gsd-power-manager.c
+++ b/plugins/power/gsd-power-manager.c
@@ -162,7 +162,7 @@ typedef enum {
 
 struct GsdPowerManagerPrivate
 {
-        GnomeSettingsSession    *session;
+        GDBusProxy              *session;
         gboolean                 lid_is_closed;
         GSettings               *settings;
         GSettings               *settings_screensaver;
@@ -2895,7 +2895,8 @@ idle_set_mode (GsdPowerManager *manager, GsdPowerIdleMode mode)
         GError *error = NULL;
         gint idle_percentage;
         GsdPowerActionType action_type;
-        GnomeSettingsSessionState state;
+        GVariant *active_v;
+        gboolean is_active = FALSE;
 
         if (mode == manager->priv->current_idle_mode)
                 return;
@@ -2906,8 +2907,14 @@ idle_set_mode (GsdPowerManager *manager, GsdPowerIdleMode mode)
                 return;
 
         /* ensure we're still on an active console */
-        state = gnome_settings_session_get_state (manager->priv->session);
-        if (state == GNOME_SETTINGS_SESSION_STATE_INACTIVE) {
+        active_v = g_dbus_proxy_get_cached_property (manager->priv->session_proxy,
+                                                     "SessionIsActive");
+        if (active_v) {
+                g_variant_get (active_v, "(b)", &is_active);
+                g_variant_unref (active_v);
+        }
+
+        if (!is_active) {
                 g_debug ("ignoring state transition to %s as inactive",
                          idle_mode_to_string (mode));
                 return;
@@ -3513,8 +3520,8 @@ engine_settings_key_changed_cb (GSettings *settings,
 }
 
 static void
-engine_session_active_changed_cb (GnomeSettingsSession *session,
-                                  GParamSpec *pspec,
+engine_session_active_changed_cb (GDBusProxy      *session,
+                                  char           **props,
                                   GsdPowerManager *manager)
 {
         /* when doing the fast-user-switch into a new account,
@@ -3951,8 +3958,8 @@ gsd_power_manager_start (GsdPowerManager *manager,
         inhibit_suspend (manager);
 
         /* track the active session */
-        manager->priv->session = gnome_settings_session_new ();
-        g_signal_connect (manager->priv->session, "notify::state",
+        manager->priv->session = gnome_settings_session_get_session_proxy ();
+        g_signal_connect (manager->priv->session, "g-properties-changed",
                           G_CALLBACK (engine_session_active_changed_cb),
                           manager);
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