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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_core_service.h"
31 * The request handle for obtaining a pooled connection
33 struct GST_ConnectionPool_GetHandle;
39 enum GST_ConnectionPool_Service
44 GST_CONNECTIONPOOL_SERVICE_TRANSPORT = 1,
49 GST_CONNECTIONPOOL_SERVICE_CORE,
54 GST_CONNECTIONPOOL_SERVICE_ATS_CONNECTIVITY
59 * Initialise the connection pool.
61 * @param size the size of the connection pool. Each entry in the connection
62 * pool can handle a connection to each of the services enumerated in
63 * #GST_ConnectionPool_Service
66 GST_connection_pool_init (unsigned int size);
70 * Cleanup the connection pool
73 GST_connection_pool_destroy (void);
76 * Functions of this type are called when the needed handle is available for
77 * usage. These functions are to be registered with the function
78 * GST_connection_pool_get_handle(). The corresponding handles will be set upon
79 * success. If they are not set, then it signals an error while opening the
82 * @param cls the closure passed to GST_connection_pool_get_handle()
83 * @param ch the handle to CORE. Can be NULL if it is not requested
84 * @param th the handle to TRANSPORT. Can be NULL if it is not requested
85 * @param ac the handle to ATS, can be NULL if it is not requested
86 * @param peer_id the identity of the peer. Will be NULL if ch is NULL. In other
87 * cases, its value being NULL means that CORE connection has failed.
88 * @param cfg configuration of the peer
91 (*GST_connection_pool_connection_ready_cb) (void *cls,
92 struct GNUNET_CORE_Handle *ch,
93 struct GNUNET_TRANSPORT_CoreHandle *th,
94 struct GNUNET_ATS_ConnectivityHandle *ac,
95 const struct GNUNET_PeerIdentity *peer_id,
96 const struct GNUNET_CONFIGURATION_Handle *cfg);
100 * Callback to notify when the target peer given to
101 * GST_connection_pool_get_handle() is connected.
103 * @param cls the closure given to GST_connection_pool_get_handle() for this
105 * @param target the peer identity of the target peer
108 (*GST_connection_pool_peer_connect_notify) (void *cls,
109 const struct GNUNET_PeerIdentity *target);
113 * Get a connection handle to @a service. If the connection is opened before
114 * and the connection handle is present in the connection pool, it is returned
115 * through @a cb. @a peer_id is used for the lookup in the connection pool. If
116 * the connection handle is not present in the connection pool, a new connection
117 * handle is opened for the @a service using @a cfg. Additionally, @a target,
118 * @a connect_notify_cb can be specified to get notified when @a target is
119 * connected at @a service.
121 * @note @a connect_notify_cb will not be called if @a target is
122 * already connected @a service level. Use
123 * GNUNET_TRANSPORT_check_peer_connected() or a similar function from the
124 * respective @a service's API to check if the target peer is already connected or
125 * not. @a connect_notify_cb will be called only once or never (in case @a target
126 * cannot be connected or is already connected).
128 * @param peer_id the index of the peer
129 * @param cfg the configuration with which the transport handle has to be
130 * created if it was not present in the cache
131 * @param service the service of interest
132 * @param cb the callback to notify when the transport handle is available
133 * @param cb_cls the closure for @a cb
134 * @param target the peer identify of the peer whose connection to our TRANSPORT
135 * subsystem will be notified through the @a connect_notify_cb. Can be NULL
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 (unsigned int peer_id,
145 const struct GNUNET_CONFIGURATION_Handle *cfg,
146 enum GST_ConnectionPool_Service service,
147 GST_connection_pool_connection_ready_cb cb,
149 const struct GNUNET_PeerIdentity *target,
150 GST_connection_pool_peer_connect_notify connect_notify_cb,
151 void *connect_notify_cb_cls);
155 * Relinquish a #GST_ConnectionPool_GetHandle object. If the connection
156 * associated with the object is currently being used by other
157 * #GST_ConnectionPool_GetHandle objects, it is left in the connection pool. If
158 * no other objects are using the connection and the connection pool is not full
159 * then it is placed in a LRU queue. If the connection pool is full, then
160 * connections from the LRU queue are evicted and closed to create place for this
161 * connection. If the connection pool if full and the LRU queue is empty, then
162 * the connection is closed.
164 * @param gh the handle
167 GST_connection_pool_get_handle_done (struct GST_ConnectionPool_GetHandle *gh);
170 /* End of gnunet-service-testbed_connectionpool.h */