diff options
| -rw-r--r-- | libindicator/indicator-service-manager.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/libindicator/indicator-service-manager.c b/libindicator/indicator-service-manager.c index 69b1343..891f49e 100644 --- a/libindicator/indicator-service-manager.c +++ b/libindicator/indicator-service-manager.c @@ -25,6 +25,8 @@ License along with this library. If not, see #include "config.h" #endif +#include <stdlib.h> + #include <dbus/dbus-glib-bindings.h> #include <dbus/dbus-glib-lowlevel.h> @@ -41,6 +43,7 @@ License along with this library. If not, see @connected: Whether we're connected to the service or not. @this_service_version: The version of the service that we're looking for. @bus: A reference to the bus so we don't have to keep getting it. + @restart_count: The number of times we've restarted this service. */ typedef struct _IndicatorServiceManagerPrivate IndicatorServiceManagerPrivate; struct _IndicatorServiceManagerPrivate { @@ -50,6 +53,7 @@ struct _IndicatorServiceManagerPrivate { gboolean connected; guint this_service_version; DBusGConnection * bus; + guint restart_count; }; /* Signals Stuff */ @@ -60,6 +64,9 @@ enum { static guint signals[LAST_SIGNAL] = { 0 }; +/* If this env variable is set, we don't restart */ +#define TIMEOUT_ENV_NAME "INDICATOR_SERVICE_RESTART_DISABLE" +#define TIMEOUT_MULTIPLIER 100 /* In ms */ /* Properties */ /* Enum for the properties so that they can be quickly @@ -86,7 +93,9 @@ static void indicator_service_manager_finalize (GObject *object); /* Prototypes */ static void set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); +static void service_proxy_destroyed (DBusGProxy * proxy, gpointer user_data); static void start_service (IndicatorServiceManager * service); +static void start_service_again (IndicatorServiceManager * manager); G_DEFINE_TYPE (IndicatorServiceManager, indicator_service_manager, G_TYPE_OBJECT); @@ -154,6 +163,7 @@ indicator_service_manager_init (IndicatorServiceManager *self) priv->connected = FALSE; priv->this_service_version = 0; priv->bus = NULL; + priv->restart_count = 0; /* Start talkin' dbus */ GError * error = NULL; @@ -312,6 +322,12 @@ watch_cb (DBusGProxy * proxy, guint service_api_version, guint this_service_vers return; } + /* We've done it, now let's stop counting. */ + /* Note: we're not checking versions. Because, the hope is that + the guy holding the name we want with the wrong version will + drop and we can start another service quickly. */ + priv->restart_count = 0; + if (service_api_version != INDICATOR_SERVICE_VERSION) { g_warning("Service is using a different version of the service interface. Expecting %d and got %d.", INDICATOR_SERVICE_VERSION, service_api_version); dbus_g_proxy_call_no_reply(priv->service_proxy, "UnWatch", G_TYPE_INVALID); @@ -343,11 +359,13 @@ start_service_cb (DBusGProxy * proxy, guint status, GError * error, gpointer use if (error != NULL) { g_warning("Unable to start service '%s': %s", priv->name, error->message); + start_service_again(INDICATOR_SERVICE_MANAGER(user_data)); return; } if (status != DBUS_START_REPLY_SUCCESS && status != DBUS_START_REPLY_ALREADY_RUNNING) { g_warning("Status of starting the process '%s' was an error: %d", priv->name, status); + start_service_again(INDICATOR_SERVICE_MANAGER(user_data)); return; } @@ -358,6 +376,7 @@ start_service_cb (DBusGProxy * proxy, guint status, GError * error, gpointer use INDICATOR_SERVICE_INTERFACE, &error); g_object_add_weak_pointer(G_OBJECT(priv->service_proxy), (gpointer *)&(priv->service_proxy)); + g_signal_connect(G_OBJECT(priv->service_proxy), "destroy", G_CALLBACK(service_proxy_destroyed), user_data); org_ayatana_indicator_service_watch_async(priv->service_proxy, watch_cb, @@ -396,6 +415,7 @@ start_service (IndicatorServiceManager * service) service); } else { g_object_add_weak_pointer(G_OBJECT(priv->service_proxy), (gpointer *)&(priv->service_proxy)); + g_signal_connect(G_OBJECT(priv->service_proxy), "destroy", G_CALLBACK(service_proxy_destroyed), service); /* If we got a proxy just because we're good people then we need to call watch on it just like 'start_service_cb' @@ -408,6 +428,58 @@ start_service (IndicatorServiceManager * service) return; } +/* Responds to the destory event of the proxy and starts + setting up to restart the service. */ +static void +service_proxy_destroyed (DBusGProxy * proxy, gpointer user_data) +{ + IndicatorServiceManagerPrivate * priv = INDICATOR_SERVICE_MANAGER_GET_PRIVATE(user_data); + if (priv->connected) { + priv->connected = FALSE; + g_signal_emit(G_OBJECT(user_data), signals[CONNECTION_CHANGE], 0, FALSE, TRUE); + } + return start_service_again(INDICATOR_SERVICE_MANAGER(user_data)); +} + +/* The callback that starts the service for real after + the timeout as determined in 'start_service_again'. + This could be in the idle or a timer. */ +static gboolean +start_service_again_cb (gpointer data) +{ + IndicatorServiceManagerPrivate * priv = INDICATOR_SERVICE_MANAGER_GET_PRIVATE(data); + priv->restart_count++; + start_service(INDICATOR_SERVICE_MANAGER(data)); + return FALSE; +} + +/* This function tries to start a new service, perhaps + after a timeout that it determines. The real issue + here is that it throttles restarting if we're not + being successful. */ +static void +start_service_again (IndicatorServiceManager * manager) +{ + IndicatorServiceManagerPrivate * priv = INDICATOR_SERVICE_MANAGER_GET_PRIVATE(manager); + + /* Allow the restarting to be disabled */ + if (g_getenv(TIMEOUT_ENV_NAME)) { + return; + } + + if (priv->restart_count == 0) { + /* First time, do it in idle */ + g_idle_add(start_service_again_cb, manager); + } else { + /* Not our first time 'round the block. Let's slow this down. */ + if (priv->restart_count > 16) + priv->restart_count = 16; /* Not more than 1024x */ + g_timeout_add((1 << priv->restart_count) * TIMEOUT_MULTIPLIER, start_service_again_cb, manager); + } + + return; +} + /* API */ /** |