2 This file is part of GNUnet.
3 Copyright (C) 2008--2015 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
22 * @file testbed/gnunet-service-testbed_connectionpool.h
23 * @brief Interface for connection pooling subroutines
24 * @author Sree Harsha Totakura <sreeharsha@totakura.in>
26 #include "gnunet_ats_service.h"
27 #include "gnunet_core_service.h"
28 #include "gnunet_transport_service.h"
31 * The request handle for obtaining a pooled connection
33 struct GST_ConnectionPool_GetHandle;
39 enum GST_ConnectionPool_Service {
43 GST_CONNECTIONPOOL_SERVICE_TRANSPORT = 1,
48 GST_CONNECTIONPOOL_SERVICE_CORE,
53 GST_CONNECTIONPOOL_SERVICE_ATS_CONNECTIVITY
58 * Initialise the connection pool.
60 * @param size the size of the connection pool. Each entry in the connection
61 * pool can handle a connection to each of the services enumerated in
62 * #GST_ConnectionPool_Service
65 GST_connection_pool_init(unsigned int size);
69 * Cleanup the connection pool
72 GST_connection_pool_destroy(void);
75 * Functions of this type are called when the needed handle is available for
76 * usage. These functions are to be registered with the function
77 * GST_connection_pool_get_handle(). The corresponding handles will be set upon
78 * success. If they are not set, then it signals an error while opening the
81 * @param cls the closure passed to GST_connection_pool_get_handle()
82 * @param ch the handle to CORE. Can be NULL if it is not requested
83 * @param th the handle to TRANSPORT. Can be NULL if it is not requested
84 * @param ac the handle to ATS, can be NULL if it is not requested
85 * @param peer_id the identity of the peer. Will be NULL if ch is NULL. In other
86 * cases, its value being NULL means that CORE connection has failed.
87 * @param cfg configuration of the peer
89 typedef void (*GST_connection_pool_connection_ready_cb) (
91 struct GNUNET_CORE_Handle *ch,
92 struct GNUNET_TRANSPORT_CoreHandle *th,
93 struct GNUNET_ATS_ConnectivityHandle *ac,
94 const struct GNUNET_PeerIdentity *peer_id,
95 const struct GNUNET_CONFIGURATION_Handle *cfg);
99 * Callback to notify when the target peer given to
100 * GST_connection_pool_get_handle() is connected.
102 * @param cls the closure given to GST_connection_pool_get_handle() for this
104 * @param target the peer identity of the target peer
106 typedef void (*GST_connection_pool_peer_connect_notify) (
108 const struct GNUNET_PeerIdentity *target);
112 * Get a connection handle to @a service. If the connection is opened before
113 * and the connection handle is present in the connection pool, it is returned
114 * through @a cb. @a peer_id is used for the lookup in the connection pool. If
115 * the connection handle is not present in the connection pool, a new connection
116 * handle is opened for the @a service using @a cfg. Additionally, @a target,
117 * @a connect_notify_cb can be specified to get notified when @a target is
118 * connected at @a service.
120 * @note @a connect_notify_cb will not be called if @a target is
121 * already connected @a service level. Use
122 * GNUNET_TRANSPORT_check_peer_connected() or a similar function from the
123 * respective @a service's API to check if the target peer is already connected
124 * or not. @a connect_notify_cb will be called only once or never (in case @a
125 * target cannot be connected or is already connected).
127 * @param peer_id the index of the peer
128 * @param cfg the configuration with which the transport handle has to be
129 * created if it was not present in the cache
130 * @param service the service of interest
131 * @param cb the callback to notify when the transport handle is available
132 * @param cb_cls the closure for @a cb
133 * @param target the peer identify of the peer whose connection to our TRANSPORT
134 * subsystem will be notified through the @a connect_notify_cb. Can be
136 * @param connect_notify_cb the callback to call when the @a target peer is
137 * connected. This callback will only be called once or never again (in
138 * case the target peer cannot be connected). Can be NULL
139 * @param connect_notify_cb_cls the closure for @a connect_notify_cb
140 * @return the handle which can be used cancel or mark that the handle is no
143 struct GST_ConnectionPool_GetHandle *
144 GST_connection_pool_get_handle(
145 unsigned int peer_id,
146 const struct GNUNET_CONFIGURATION_Handle *cfg,
147 enum GST_ConnectionPool_Service service,
148 GST_connection_pool_connection_ready_cb cb,
150 const struct GNUNET_PeerIdentity *target,
151 GST_connection_pool_peer_connect_notify connect_notify_cb,
152 void *connect_notify_cb_cls);
156 * Relinquish a #GST_ConnectionPool_GetHandle object. If the connection
157 * associated with the object is currently being used by other
158 * #GST_ConnectionPool_GetHandle objects, it is left in the connection pool. If
159 * no other objects are using the connection and the connection pool is not full
160 * then it is placed in a LRU queue. If the connection pool is full, then
161 * connections from the LRU queue are evicted and closed to create place for
162 * this connection. If the connection pool if full and the LRU queue is empty,
163 * then the connection is closed.
165 * @param gh the handle
168 GST_connection_pool_get_handle_done(struct GST_ConnectionPool_GetHandle *gh);
171 /* End of gnunet-service-testbed_connectionpool.h */