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18a33f72db
If we have an input parameter (or return value) we need to use (nullable). However, if it is an (inout) or (out) parameter, (optional) is sufficient. It looks like (nullable) could be used for everything according to the Annotation documentation, but (optional) is more specific.
423 lines
12 KiB
C
423 lines
12 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright © 2009 Codethink Limited
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* Copyright © 2009 Red Hat, Inc
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2 of the licence or (at
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* your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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* Authors: Ryan Lortie <desrt@desrt.ca>
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* Alexander Larsson <alexl@redhat.com>
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*/
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/**
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* SECTION:gsocketservice
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* @title: GSocketService
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* @short_description: Make it easy to implement a network service
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* @include: gio/gio.h
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* @see_also: #GThreadedSocketService, #GSocketListener.
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*
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* A #GSocketService is an object that represents a service that
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* is provided to the network or over local sockets. When a new
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* connection is made to the service the #GSocketService::incoming
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* signal is emitted.
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*
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* A #GSocketService is a subclass of #GSocketListener and you need
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* to add the addresses you want to accept connections on with the
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* #GSocketListener APIs.
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*
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* There are two options for implementing a network service based on
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* #GSocketService. The first is to create the service using
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* g_socket_service_new() and to connect to the #GSocketService::incoming
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* signal. The second is to subclass #GSocketService and override the
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* default signal handler implementation.
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*
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* In either case, the handler must immediately return, or else it
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* will block additional incoming connections from being serviced.
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* If you are interested in writing connection handlers that contain
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* blocking code then see #GThreadedSocketService.
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*
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* The socket service runs on the main loop of the
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* [thread-default context][g-main-context-push-thread-default-context]
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* of the thread it is created in, and is not
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* threadsafe in general. However, the calls to start and stop the
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* service are thread-safe so these can be used from threads that
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* handle incoming clients.
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*
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* Since: 2.22
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*/
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#include "config.h"
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#include "gsocketservice.h"
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#include <gio/gio.h>
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#include "gsocketlistener.h"
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#include "gsocketconnection.h"
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#include "glibintl.h"
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struct _GSocketServicePrivate
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{
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GCancellable *cancellable;
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guint active : 1;
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guint outstanding_accept : 1;
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};
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static guint g_socket_service_incoming_signal;
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G_LOCK_DEFINE_STATIC(active);
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G_DEFINE_TYPE_WITH_PRIVATE (GSocketService, g_socket_service, G_TYPE_SOCKET_LISTENER)
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enum
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{
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PROP_0,
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PROP_ACTIVE
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};
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static void g_socket_service_ready (GObject *object,
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GAsyncResult *result,
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gpointer user_data);
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static gboolean
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g_socket_service_real_incoming (GSocketService *service,
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GSocketConnection *connection,
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GObject *source_object)
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{
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return FALSE;
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}
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static void
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g_socket_service_init (GSocketService *service)
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{
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service->priv = g_socket_service_get_instance_private (service);
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service->priv->cancellable = g_cancellable_new ();
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service->priv->active = TRUE;
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}
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static void
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g_socket_service_finalize (GObject *object)
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{
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GSocketService *service = G_SOCKET_SERVICE (object);
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g_object_unref (service->priv->cancellable);
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G_OBJECT_CLASS (g_socket_service_parent_class)
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->finalize (object);
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}
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static void
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do_accept (GSocketService *service)
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{
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g_socket_listener_accept_async (G_SOCKET_LISTENER (service),
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service->priv->cancellable,
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g_socket_service_ready, NULL);
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service->priv->outstanding_accept = TRUE;
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}
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static gboolean
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get_active (GSocketService *service)
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{
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gboolean active;
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G_LOCK (active);
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active = service->priv->active;
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G_UNLOCK (active);
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return active;
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}
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static void
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set_active (GSocketService *service, gboolean active)
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{
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gboolean notify = FALSE;
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active = !!active;
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G_LOCK (active);
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if (active != service->priv->active)
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{
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service->priv->active = active;
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notify = TRUE;
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if (active)
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{
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if (service->priv->outstanding_accept)
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g_cancellable_cancel (service->priv->cancellable);
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else
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do_accept (service);
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}
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else
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{
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if (service->priv->outstanding_accept)
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g_cancellable_cancel (service->priv->cancellable);
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}
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}
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G_UNLOCK (active);
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if (notify)
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g_object_notify (G_OBJECT (service), "active");
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}
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static void
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g_socket_service_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GSocketService *service = G_SOCKET_SERVICE (object);
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switch (prop_id)
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{
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case PROP_ACTIVE:
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g_value_set_boolean (value, get_active (service));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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g_socket_service_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GSocketService *service = G_SOCKET_SERVICE (object);
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switch (prop_id)
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{
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case PROP_ACTIVE:
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set_active (service, g_value_get_boolean (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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g_socket_service_changed (GSocketListener *listener)
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{
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GSocketService *service = G_SOCKET_SERVICE (listener);
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G_LOCK (active);
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if (service->priv->active)
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{
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if (service->priv->outstanding_accept)
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g_cancellable_cancel (service->priv->cancellable);
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else
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do_accept (service);
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}
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G_UNLOCK (active);
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}
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/**
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* g_socket_service_is_active:
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* @service: a #GSocketService
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*
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* Check whether the service is active or not. An active
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* service will accept new clients that connect, while
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* a non-active service will let connecting clients queue
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* up until the service is started.
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*
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* Returns: %TRUE if the service is active, %FALSE otherwise
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*
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* Since: 2.22
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*/
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gboolean
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g_socket_service_is_active (GSocketService *service)
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{
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g_return_val_if_fail (G_IS_SOCKET_SERVICE (service), FALSE);
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return get_active (service);
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}
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/**
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* g_socket_service_start:
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* @service: a #GSocketService
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*
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* Restarts the service, i.e. start accepting connections
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* from the added sockets when the mainloop runs. This only needs
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* to be called after the service has been stopped from
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* g_socket_service_stop().
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*
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* This call is thread-safe, so it may be called from a thread
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* handling an incoming client request.
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*
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* Since: 2.22
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*/
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void
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g_socket_service_start (GSocketService *service)
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{
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g_return_if_fail (G_IS_SOCKET_SERVICE (service));
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set_active (service, TRUE);
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}
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/**
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* g_socket_service_stop:
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* @service: a #GSocketService
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*
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* Stops the service, i.e. stops accepting connections
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* from the added sockets when the mainloop runs.
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*
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* This call is thread-safe, so it may be called from a thread
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* handling an incoming client request.
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*
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* Note that this only stops accepting new connections; it does not
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* close the listening sockets, and you can call
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* g_socket_service_start() again later to begin listening again. To
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* close the listening sockets, call g_socket_listener_close(). (This
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* will happen automatically when the #GSocketService is finalized.)
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*
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* This must be called before calling g_socket_listener_close() as
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* the socket service will start accepting connections immediately
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* when a new socket is added.
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*
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* Since: 2.22
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*/
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void
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g_socket_service_stop (GSocketService *service)
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{
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g_return_if_fail (G_IS_SOCKET_SERVICE (service));
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set_active (service, FALSE);
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}
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static gboolean
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g_socket_service_incoming (GSocketService *service,
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GSocketConnection *connection,
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GObject *source_object)
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{
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gboolean result;
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g_signal_emit (service, g_socket_service_incoming_signal,
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0, connection, source_object, &result);
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return result;
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}
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static void
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g_socket_service_class_init (GSocketServiceClass *class)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (class);
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GSocketListenerClass *listener_class = G_SOCKET_LISTENER_CLASS (class);
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gobject_class->finalize = g_socket_service_finalize;
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gobject_class->set_property = g_socket_service_set_property;
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gobject_class->get_property = g_socket_service_get_property;
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listener_class->changed = g_socket_service_changed;
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class->incoming = g_socket_service_real_incoming;
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/**
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* GSocketService::incoming:
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* @service: the #GSocketService
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* @connection: a new #GSocketConnection object
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* @source_object: (nullable): the source_object passed to
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* g_socket_listener_add_address()
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*
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* The ::incoming signal is emitted when a new incoming connection
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* to @service needs to be handled. The handler must initiate the
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* handling of @connection, but may not block; in essence,
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* asynchronous operations must be used.
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*
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* @connection will be unreffed once the signal handler returns,
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* so you need to ref it yourself if you are planning to use it.
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*
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* Returns: %TRUE to stop other handlers from being called
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*
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* Since: 2.22
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*/
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g_socket_service_incoming_signal =
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g_signal_new (I_("incoming"), G_TYPE_FROM_CLASS (class), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GSocketServiceClass, incoming),
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g_signal_accumulator_true_handled, NULL,
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NULL, G_TYPE_BOOLEAN,
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2, G_TYPE_SOCKET_CONNECTION, G_TYPE_OBJECT);
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/**
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* GSocketService:active:
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*
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* Whether the service is currently accepting connections.
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*
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* Since: 2.46
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*/
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g_object_class_install_property (gobject_class, PROP_ACTIVE,
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g_param_spec_boolean ("active",
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P_("Active"),
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P_("Whether the service is currently accepting connections"),
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TRUE,
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G_PARAM_CONSTRUCT | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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}
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static void
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g_socket_service_ready (GObject *object,
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GAsyncResult *result,
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gpointer user_data)
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{
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GSocketListener *listener = G_SOCKET_LISTENER (object);
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GSocketService *service = G_SOCKET_SERVICE (object);
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GSocketConnection *connection;
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GObject *source_object;
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GError *error = NULL;
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connection = g_socket_listener_accept_finish (listener, result, &source_object, &error);
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if (error)
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{
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if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
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g_warning ("fail: %s", error->message);
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g_error_free (error);
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}
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else
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{
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g_socket_service_incoming (service, connection, source_object);
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g_object_unref (connection);
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}
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G_LOCK (active);
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g_cancellable_reset (service->priv->cancellable);
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/* requeue */
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service->priv->outstanding_accept = FALSE;
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if (service->priv->active)
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do_accept (service);
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G_UNLOCK (active);
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}
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/**
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* g_socket_service_new:
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*
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* Creates a new #GSocketService with no sockets to listen for.
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* New listeners can be added with e.g. g_socket_listener_add_address()
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* or g_socket_listener_add_inet_port().
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*
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* New services are created active, there is no need to call
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* g_socket_service_start(), unless g_socket_service_stop() has been
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* called before.
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*
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* Returns: a new #GSocketService.
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*
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* Since: 2.22
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*/
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GSocketService *
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g_socket_service_new (void)
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{
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return g_object_new (G_TYPE_SOCKET_SERVICE, NULL);
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}
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