1 /* GIO - GLib Input, Output and Streaming Library
3 * Copyright © 2009 Codethink Limited
4 * Copyright © 2009 Red Hat, Inc
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General
17 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
19 * Authors: Ryan Lortie <desrt@desrt.ca>
20 * Alexander Larsson <alexl@redhat.com>
24 * SECTION:gsocketservice
25 * @title: GSocketService
26 * @short_description: Make it easy to implement a network service
28 * @see_also: #GThreadedSocketService, #GSocketListener.
30 * A #GSocketService is an object that represents a service that
31 * is provided to the network or over local sockets. When a new
32 * connection is made to the service the #GSocketService::incoming
35 * A #GSocketService is a subclass of #GSocketListener and you need
36 * to add the addresses you want to accept connections on with the
37 * #GSocketListener APIs.
39 * There are two options for implementing a network service based on
40 * #GSocketService. The first is to create the service using
41 * g_socket_service_new() and to connect to the #GSocketService::incoming
42 * signal. The second is to subclass #GSocketService and override the
43 * default signal handler implementation.
45 * In either case, the handler must immediately return, or else it
46 * will block additional incoming connections from being serviced.
47 * If you are interested in writing connection handlers that contain
48 * blocking code then see #GThreadedSocketService.
50 * The socket service runs on the main loop of the
51 * [thread-default context][g-main-context-push-thread-default-context]
52 * of the thread it is created in, and is not
53 * threadsafe in general. However, the calls to start and stop the
54 * service are thread-safe so these can be used from threads that
55 * handle incoming clients.
61 #include "gsocketservice.h"
64 #include "gsocketlistener.h"
65 #include "gsocketconnection.h"
67 #include "gmarshal-internal.h"
69 struct _GSocketServicePrivate
71 GCancellable *cancellable;
73 guint outstanding_accept : 1;
76 static guint g_socket_service_incoming_signal;
78 G_LOCK_DEFINE_STATIC(active);
80 G_DEFINE_TYPE_WITH_PRIVATE (GSocketService, g_socket_service, G_TYPE_SOCKET_LISTENER)
88 static void g_socket_service_ready (GObject *object,
93 g_socket_service_real_incoming (GSocketService *service,
94 GSocketConnection *connection,
95 GObject *source_object)
101 g_socket_service_init (GSocketService *service)
103 service->priv = g_socket_service_get_instance_private (service);
104 service->priv->cancellable = g_cancellable_new ();
105 service->priv->active = TRUE;
109 g_socket_service_finalize (GObject *object)
111 GSocketService *service = G_SOCKET_SERVICE (object);
113 g_object_unref (service->priv->cancellable);
115 G_OBJECT_CLASS (g_socket_service_parent_class)
120 do_accept (GSocketService *service)
122 g_socket_listener_accept_async (G_SOCKET_LISTENER (service),
123 service->priv->cancellable,
124 g_socket_service_ready, NULL);
125 service->priv->outstanding_accept = TRUE;
129 get_active (GSocketService *service)
134 active = service->priv->active;
141 set_active (GSocketService *service, gboolean active)
143 gboolean notify = FALSE;
149 if (active != service->priv->active)
151 service->priv->active = active;
156 if (service->priv->outstanding_accept)
157 g_cancellable_cancel (service->priv->cancellable);
163 if (service->priv->outstanding_accept)
164 g_cancellable_cancel (service->priv->cancellable);
171 g_object_notify (G_OBJECT (service), "active");
175 g_socket_service_get_property (GObject *object,
180 GSocketService *service = G_SOCKET_SERVICE (object);
185 g_value_set_boolean (value, get_active (service));
188 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
194 g_socket_service_set_property (GObject *object,
199 GSocketService *service = G_SOCKET_SERVICE (object);
204 set_active (service, g_value_get_boolean (value));
207 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
213 g_socket_service_changed (GSocketListener *listener)
215 GSocketService *service = G_SOCKET_SERVICE (listener);
219 if (service->priv->active)
221 if (service->priv->outstanding_accept)
222 g_cancellable_cancel (service->priv->cancellable);
231 * g_socket_service_is_active:
232 * @service: a #GSocketService
234 * Check whether the service is active or not. An active
235 * service will accept new clients that connect, while
236 * a non-active service will let connecting clients queue
237 * up until the service is started.
239 * Returns: %TRUE if the service is active, %FALSE otherwise
244 g_socket_service_is_active (GSocketService *service)
246 g_return_val_if_fail (G_IS_SOCKET_SERVICE (service), FALSE);
248 return get_active (service);
252 * g_socket_service_start:
253 * @service: a #GSocketService
255 * Restarts the service, i.e. start accepting connections
256 * from the added sockets when the mainloop runs. This only needs
257 * to be called after the service has been stopped from
258 * g_socket_service_stop().
260 * This call is thread-safe, so it may be called from a thread
261 * handling an incoming client request.
266 g_socket_service_start (GSocketService *service)
268 g_return_if_fail (G_IS_SOCKET_SERVICE (service));
270 set_active (service, TRUE);
274 * g_socket_service_stop:
275 * @service: a #GSocketService
277 * Stops the service, i.e. stops accepting connections
278 * from the added sockets when the mainloop runs.
280 * This call is thread-safe, so it may be called from a thread
281 * handling an incoming client request.
283 * Note that this only stops accepting new connections; it does not
284 * close the listening sockets, and you can call
285 * g_socket_service_start() again later to begin listening again. To
286 * close the listening sockets, call g_socket_listener_close(). (This
287 * will happen automatically when the #GSocketService is finalized.)
289 * This must be called before calling g_socket_listener_close() as
290 * the socket service will start accepting connections immediately
291 * when a new socket is added.
296 g_socket_service_stop (GSocketService *service)
298 g_return_if_fail (G_IS_SOCKET_SERVICE (service));
300 set_active (service, FALSE);
304 g_socket_service_incoming (GSocketService *service,
305 GSocketConnection *connection,
306 GObject *source_object)
310 g_signal_emit (service, g_socket_service_incoming_signal,
311 0, connection, source_object, &result);
316 g_socket_service_class_init (GSocketServiceClass *class)
318 GObjectClass *gobject_class = G_OBJECT_CLASS (class);
319 GSocketListenerClass *listener_class = G_SOCKET_LISTENER_CLASS (class);
321 gobject_class->finalize = g_socket_service_finalize;
322 gobject_class->set_property = g_socket_service_set_property;
323 gobject_class->get_property = g_socket_service_get_property;
324 listener_class->changed = g_socket_service_changed;
325 class->incoming = g_socket_service_real_incoming;
328 * GSocketService::incoming:
329 * @service: the #GSocketService
330 * @connection: a new #GSocketConnection object
331 * @source_object: (nullable): the source_object passed to
332 * g_socket_listener_add_address()
334 * The ::incoming signal is emitted when a new incoming connection
335 * to @service needs to be handled. The handler must initiate the
336 * handling of @connection, but may not block; in essence,
337 * asynchronous operations must be used.
339 * @connection will be unreffed once the signal handler returns,
340 * so you need to ref it yourself if you are planning to use it.
342 * Returns: %TRUE to stop other handlers from being called
346 g_socket_service_incoming_signal =
347 g_signal_new (I_("incoming"), G_TYPE_FROM_CLASS (class), G_SIGNAL_RUN_LAST,
348 G_STRUCT_OFFSET (GSocketServiceClass, incoming),
349 g_signal_accumulator_true_handled, NULL,
350 _g_cclosure_marshal_BOOLEAN__OBJECT_OBJECT,
352 2, G_TYPE_SOCKET_CONNECTION, G_TYPE_OBJECT);
353 g_signal_set_va_marshaller (g_socket_service_incoming_signal,
354 G_TYPE_FROM_CLASS (class),
355 _g_cclosure_marshal_BOOLEAN__OBJECT_OBJECTv);
358 * GSocketService:active:
360 * Whether the service is currently accepting connections.
364 g_object_class_install_property (gobject_class, PROP_ACTIVE,
365 g_param_spec_boolean ("active",
367 P_("Whether the service is currently accepting connections"),
369 G_PARAM_CONSTRUCT | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
373 g_socket_service_ready (GObject *object,
374 GAsyncResult *result,
377 GSocketListener *listener = G_SOCKET_LISTENER (object);
378 GSocketService *service = G_SOCKET_SERVICE (object);
379 GSocketConnection *connection;
380 GObject *source_object;
381 GError *error = NULL;
383 connection = g_socket_listener_accept_finish (listener, result, &source_object, &error);
386 if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
387 g_warning ("fail: %s", error->message);
388 g_error_free (error);
392 g_socket_service_incoming (service, connection, source_object);
393 g_object_unref (connection);
398 g_cancellable_reset (service->priv->cancellable);
401 service->priv->outstanding_accept = FALSE;
402 if (service->priv->active)
409 * g_socket_service_new:
411 * Creates a new #GSocketService with no sockets to listen for.
412 * New listeners can be added with e.g. g_socket_listener_add_address()
413 * or g_socket_listener_add_inet_port().
415 * New services are created active, there is no need to call
416 * g_socket_service_start(), unless g_socket_service_stop() has been
419 * Returns: a new #GSocketService.
424 g_socket_service_new (void)
426 return g_object_new (G_TYPE_SOCKET_SERVICE, NULL);