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1 : : /* GIO - GLib Input, Output and Streaming Library
2 : : *
3 : : * Copyright © 2009 Codethink Limited
4 : : * Copyright © 2009 Red Hat, Inc
5 : : *
6 : : * SPDX-License-Identifier: LGPL-2.1-or-later
7 : : *
8 : : * This library is free software; you can redistribute it and/or
9 : : * modify it under the terms of the GNU Lesser General Public
10 : : * License as published by the Free Software Foundation; either
11 : : * version 2.1 of the License, or (at your option) any later version.
12 : : *
13 : : * This library is distributed in the hope that it will be useful,
14 : : * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 : : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 : : * Lesser General Public License for more details.
17 : : *
18 : : * You should have received a copy of the GNU Lesser General
19 : : * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
20 : : *
21 : : * Authors: Ryan Lortie <desrt@desrt.ca>
22 : : * Alexander Larsson <alexl@redhat.com>
23 : : */
24 : :
25 : : /**
26 : : * GThreadedSocketService:
27 : : *
28 : : * A `GThreadedSocketService` is a simple subclass of [class@Gio.SocketService]
29 : : * that handles incoming connections by creating a worker thread and
30 : : * dispatching the connection to it by emitting the
31 : : * [signal@Gio.ThreadedSocketService::run signal] in the new thread.
32 : : *
33 : : * The signal handler may perform blocking I/O and need not return
34 : : * until the connection is closed.
35 : : *
36 : : * The service is implemented using a thread pool, so there is a
37 : : * limited amount of threads available to serve incoming requests.
38 : : * The service automatically stops the [class@Gio.SocketService] from accepting
39 : : * new connections when all threads are busy.
40 : : *
41 : : * As with [class@Gio.SocketService], you may connect to
42 : : * [signal@Gio.ThreadedSocketService::run], or subclass and override the default
43 : : * handler.
44 : : *
45 : : * Since: 2.22
46 : : */
47 : :
48 : : #include "config.h"
49 : : #include "gsocketconnection.h"
50 : : #include "gthreadedsocketservice.h"
51 : : #include "glibintl.h"
52 : : #include "gmarshal-internal.h"
53 : :
54 : : struct _GThreadedSocketServicePrivate
55 : : {
56 : : GThreadPool *thread_pool;
57 : : int max_threads;
58 : : gint job_count;
59 : : };
60 : :
61 : : static guint g_threaded_socket_service_run_signal;
62 : :
63 [ + + + - : 367 : G_DEFINE_TYPE_WITH_PRIVATE (GThreadedSocketService,
+ + ]
64 : : g_threaded_socket_service,
65 : : G_TYPE_SOCKET_SERVICE)
66 : :
67 : : typedef enum
68 : : {
69 : : PROP_MAX_THREADS = 1,
70 : : } GThreadedSocketServiceProperty;
71 : :
72 : : G_LOCK_DEFINE_STATIC(job_count);
73 : :
74 : : typedef struct
75 : : {
76 : : GThreadedSocketService *service; /* (owned) */
77 : : GSocketConnection *connection; /* (owned) */
78 : : GObject *source_object; /* (owned) (nullable) */
79 : : } GThreadedSocketServiceData;
80 : :
81 : : static void
82 : 222 : g_threaded_socket_service_data_free (GThreadedSocketServiceData *data)
83 : : {
84 : 222 : g_clear_object (&data->service);
85 : 222 : g_clear_object (&data->connection);
86 : 222 : g_clear_object (&data->source_object);
87 : 222 : g_slice_free (GThreadedSocketServiceData, data);
88 : 222 : }
89 : :
90 : : static void
91 : 222 : g_threaded_socket_service_func (gpointer job_data,
92 : : gpointer user_data)
93 : : {
94 : 222 : GThreadedSocketServiceData *data = job_data;
95 : : gboolean result;
96 : :
97 : 222 : g_signal_emit (data->service, g_threaded_socket_service_run_signal,
98 : : 0, data->connection, data->source_object, &result);
99 : :
100 : 222 : G_LOCK (job_count);
101 [ - + ]: 222 : if (data->service->priv->job_count-- == data->service->priv->max_threads)
102 : 0 : g_socket_service_start (G_SOCKET_SERVICE (data->service));
103 : 222 : G_UNLOCK (job_count);
104 : :
105 : 222 : g_threaded_socket_service_data_free (data);
106 : 222 : }
107 : :
108 : : static gboolean
109 : 222 : g_threaded_socket_service_incoming (GSocketService *service,
110 : : GSocketConnection *connection,
111 : : GObject *source_object)
112 : : {
113 : : GThreadedSocketService *threaded;
114 : : GThreadedSocketServiceData *data;
115 : 222 : GError *local_error = NULL;
116 : :
117 : 222 : threaded = G_THREADED_SOCKET_SERVICE (service);
118 : :
119 : 222 : data = g_slice_new0 (GThreadedSocketServiceData);
120 : 222 : data->service = g_object_ref (threaded);
121 : 222 : data->connection = g_object_ref (connection);
122 [ - + ]: 222 : data->source_object = (source_object != NULL) ? g_object_ref (source_object) : NULL;
123 : :
124 : 222 : G_LOCK (job_count);
125 [ - + ]: 222 : if (++threaded->priv->job_count == threaded->priv->max_threads)
126 : 0 : g_socket_service_stop (service);
127 : 222 : G_UNLOCK (job_count);
128 : :
129 [ - + ]: 222 : if (!g_thread_pool_push (threaded->priv->thread_pool, data, &local_error))
130 : : {
131 : 0 : g_warning ("Error handling incoming socket: %s", local_error->message);
132 : 0 : g_threaded_socket_service_data_free (data);
133 : : }
134 : :
135 : 222 : g_clear_error (&local_error);
136 : :
137 : 222 : return FALSE;
138 : : }
139 : :
140 : : static void
141 : 27 : g_threaded_socket_service_init (GThreadedSocketService *service)
142 : : {
143 : 27 : service->priv = g_threaded_socket_service_get_instance_private (service);
144 : 27 : service->priv->max_threads = 10;
145 : 27 : }
146 : :
147 : : static void
148 : 27 : g_threaded_socket_service_constructed (GObject *object)
149 : : {
150 : 27 : GThreadedSocketService *service = G_THREADED_SOCKET_SERVICE (object);
151 : :
152 : 54 : service->priv->thread_pool =
153 : 27 : g_thread_pool_new (g_threaded_socket_service_func,
154 : : NULL,
155 : 27 : service->priv->max_threads,
156 : : FALSE,
157 : : NULL);
158 : 27 : }
159 : :
160 : :
161 : : static void
162 : 19 : g_threaded_socket_service_finalize (GObject *object)
163 : : {
164 : 19 : GThreadedSocketService *service = G_THREADED_SOCKET_SERVICE (object);
165 : :
166 : : /* All jobs in the pool hold a reference to this #GThreadedSocketService, so
167 : : * this should only be called once the pool is empty: */
168 : 19 : g_thread_pool_free (service->priv->thread_pool, FALSE, FALSE);
169 : :
170 : 19 : G_OBJECT_CLASS (g_threaded_socket_service_parent_class)
171 : 19 : ->finalize (object);
172 : 19 : }
173 : :
174 : : static void
175 : 1 : g_threaded_socket_service_get_property (GObject *object,
176 : : guint prop_id,
177 : : GValue *value,
178 : : GParamSpec *pspec)
179 : : {
180 : 1 : GThreadedSocketService *service = G_THREADED_SOCKET_SERVICE (object);
181 : :
182 [ + - ]: 1 : switch ((GThreadedSocketServiceProperty) prop_id)
183 : : {
184 : 1 : case PROP_MAX_THREADS:
185 : 1 : g_value_set_int (value, service->priv->max_threads);
186 : 1 : break;
187 : :
188 : 0 : default:
189 : 0 : G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
190 : : }
191 : 1 : }
192 : :
193 : : static void
194 : 27 : g_threaded_socket_service_set_property (GObject *object,
195 : : guint prop_id,
196 : : const GValue *value,
197 : : GParamSpec *pspec)
198 : : {
199 : 27 : GThreadedSocketService *service = G_THREADED_SOCKET_SERVICE (object);
200 : :
201 [ + - ]: 27 : switch ((GThreadedSocketServiceProperty) prop_id)
202 : : {
203 : 27 : case PROP_MAX_THREADS:
204 : 27 : service->priv->max_threads = g_value_get_int (value);
205 : 27 : break;
206 : :
207 : 0 : default:
208 : 0 : G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
209 : : }
210 : 27 : }
211 : :
212 : :
213 : : static void
214 : 8 : g_threaded_socket_service_class_init (GThreadedSocketServiceClass *class)
215 : : {
216 : 8 : GObjectClass *gobject_class = G_OBJECT_CLASS (class);
217 : 8 : GSocketServiceClass *ss_class = &class->parent_class;
218 : :
219 : 8 : gobject_class->constructed = g_threaded_socket_service_constructed;
220 : 8 : gobject_class->finalize = g_threaded_socket_service_finalize;
221 : 8 : gobject_class->set_property = g_threaded_socket_service_set_property;
222 : 8 : gobject_class->get_property = g_threaded_socket_service_get_property;
223 : :
224 : 8 : ss_class->incoming = g_threaded_socket_service_incoming;
225 : :
226 : : /**
227 : : * GThreadedSocketService::run:
228 : : * @service: the #GThreadedSocketService.
229 : : * @connection: a new #GSocketConnection object.
230 : : * @source_object: (nullable): the source_object passed to g_socket_listener_add_address().
231 : : *
232 : : * The ::run signal is emitted in a worker thread in response to an
233 : : * incoming connection. This thread is dedicated to handling
234 : : * @connection and may perform blocking IO. The signal handler need
235 : : * not return until the connection is closed.
236 : : *
237 : : * Returns: %TRUE to stop further signal handlers from being called
238 : : */
239 : 8 : g_threaded_socket_service_run_signal =
240 : 8 : g_signal_new (I_("run"), G_TYPE_FROM_CLASS (class), G_SIGNAL_RUN_LAST,
241 : : G_STRUCT_OFFSET (GThreadedSocketServiceClass, run),
242 : : g_signal_accumulator_true_handled, NULL,
243 : : _g_cclosure_marshal_BOOLEAN__OBJECT_OBJECT,
244 : : G_TYPE_BOOLEAN,
245 : : 2, G_TYPE_SOCKET_CONNECTION, G_TYPE_OBJECT);
246 : 8 : g_signal_set_va_marshaller (g_threaded_socket_service_run_signal,
247 : : G_TYPE_FROM_CLASS (class),
248 : : _g_cclosure_marshal_BOOLEAN__OBJECT_OBJECTv);
249 : :
250 : : /**
251 : : * GThreadedSocketService:max-threads:
252 : : *
253 : : * The maximum number of threads handling clients for this service.
254 : : *
255 : : * Since: 2.22
256 : : */
257 : 8 : g_object_class_install_property (gobject_class, PROP_MAX_THREADS,
258 : : g_param_spec_int ("max-threads", NULL, NULL,
259 : : -1,
260 : : G_MAXINT,
261 : : 10,
262 : : G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
263 : 8 : }
264 : :
265 : : /**
266 : : * g_threaded_socket_service_new:
267 : : * @max_threads: the maximal number of threads to execute concurrently
268 : : * handling incoming clients, -1 means no limit
269 : : *
270 : : * Creates a new #GThreadedSocketService with no listeners. Listeners
271 : : * must be added with one of the #GSocketListener "add" methods.
272 : : *
273 : : * Returns: a new #GSocketService.
274 : : *
275 : : * Since: 2.22
276 : : */
277 : : GSocketService *
278 : 25 : g_threaded_socket_service_new (int max_threads)
279 : : {
280 : 25 : return g_object_new (G_TYPE_THREADED_SOCKET_SERVICE,
281 : : "max-threads", max_threads,
282 : : NULL);
283 : : }
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