2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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22 * @file include/gnunet_mesh_service.h
23 * @brief mesh service; establish tunnels to distant peers
24 * @author Christian Grothoff
27 #ifndef GNUNET_MESH_SERVICE_H
28 #define GNUNET_MESH_SERVICE_H
33 #if 0 /* keep Emacsens' auto-indent happy */
38 #include "gnunet_util_lib.h"
39 #include "gnunet_transport_service.h"
42 * Version number of GNUnet-mesh API.
44 #define GNUNET_MESH_VERSION 0x00000000
48 * Opaque handle to the service.
50 struct GNUNET_MESH_Handle;
53 * Opaque handle to a tunnel.
55 struct GNUNET_MESH_Tunnel;
58 * Functions with this signature are called whenever a message is
59 * received or transmitted.
61 * @param cls closure (set from GNUNET_MESH_connect)
62 * @param tunnel connection to the other end
63 * @param tunnel_ctx place to store local state associated with the tunnel
64 * @param message the actual message
65 * @param atsi performance data for the connection
66 * @return GNUNET_OK to keep the connection open,
67 * GNUNET_SYSERR to close it (signal serious error)
70 (*GNUNET_MESH_MessageCallback) (void *cls,
71 const struct GNUNET_MESH_Tunnel *tunnel,
73 const struct GNUNET_MessageHeader *message,
74 const struct GNUNET_TRANSPORT_ATS_Information *atsi);
78 * Message handler. Each struct specifies how to handle on particular
79 * type of message received.
81 struct GNUNET_MESH_MessageHandler
84 * Function to call for messages of "type".
86 GNUNET_MESH_MessageCallback callback;
89 * Type of the message this handler covers.
94 * Expected size of messages of this type. Use 0 for variable-size.
95 * If non-zero, messages of the given type will be discarded if they
96 * do not have the right size.
98 uint16_t expected_size;
104 * Function called whenever an inbound tunnel is destroyed. Should clean up
105 * any associated state.
107 * @param cls closure (set from GNUNET_MESH_connect)
108 * @param tunnel connection to the other end (henceforth invalid)
109 * @param tunnel_ctx place where local state associated with the tunnel is stored
111 typedef void (GNUNET_MESH_TunnelEndHandler)(void *cls,
112 const struct GNUNET_MESH_Tunnel *tunnel,
117 * Connect to the mesh service.
119 * @param cfg configuration to use
120 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
121 * @param cleaner function called when an *inbound* tunnel is destroyed
122 * @param handlers callbacks for messages we care about, NULL-terminated
123 * note that the mesh is allowed to drop notifications about inbound
124 * messages if the client does not process them fast enough (for this
125 * notification type, a bounded queue is used)
126 * @return handle to the mesh service
127 * NULL on error (in this case, init is never called)
129 struct GNUNET_MESH_Handle *
130 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
132 GNUNET_MESH_TunnelEndHandler cleaner,
133 const struct GNUNET_MESH_MessageHandler *handlers);
137 * Disconnect from the mesh service.
139 * @param handle connection to mesh to disconnect
141 void GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle);
148 * Method called whenever a tunnel falls apart.
151 * @param peer peer identity the tunnel stopped working with
153 typedef void (*GNUNET_MESH_TunnelDisconnectHandler) (void *cls,
154 const struct GNUNET_PeerIdentity *peer);
158 * Method called whenever a tunnel is established.
161 * @param peer peer identity the tunnel was created to, NULL on timeout
162 * @param atsi performance data for the connection
164 typedef void (*GNUNET_MESH_TunnelConnectHandler) (void *cls,
165 const struct GNUNET_PeerIdentity *peer,
166 const struct GNUNET_TRANSPORT_ATS_Information *atsi);
171 * Handle for a request to the mesh to connect or disconnect
172 * from a particular peer. Can be used to cancel the request
173 * (before the 'cont'inuation is called).
175 struct GNUNET_MESH_PeerRequestHandle;
179 * Request that the mesh should try to connect to any of the given peers.
181 * @param h mesh handle
182 * @param timeout how long to try to establish a connection
183 * @param num_peers length of the peers arrray
184 * @param peers list of candidates to connect to
185 * @param connect_handler function to call on successful connect (or timeout)
186 * @param disconnect_handler function to call on disconnect
187 * @param handler_cls closure for handler
188 * @return NULL on error (handler will not be called), otherwise handle for cancellation
190 struct GNUNET_MESH_Tunnel *
191 GNUNET_MESH_peer_request_connect_any (struct GNUNET_MESH_Handle *h,
192 struct GNUNET_TIME_Relative timeout,
193 unsigned int num_peers,
194 const struct GNUNET_PeerIdentity *peers,
195 GNUNET_MESH_TunnelConnectHandler connect_handler,
196 GNUNET_MESH_TunnelDisconnectHandler disconnect_handler,
201 * Request that the mesh should try to connect to all of the given peers.
202 * Messages send to the tunnel will be broadcast.
204 * @param h mesh handle
205 * @param timeout how long to try to establish a connection
206 * @param num_peers length of the peers arrray
207 * @param peers list of candidates to connect to
208 * @param connect_handler function to call on successful connect (or timeout);
209 * will be called for EACH of the peers in the list and
210 * once at the end with 'NULL' on timeout or once we've connected
211 * to each of the peers in the list
212 * @param disconnect_handler function called if a peer drops out of the tunnel;
213 * the mesh will NOT try to add it back automatically
214 * @param handler_cls closure for handler
215 * @return NULL on error (handler will not be called), otherwise handle for cancellation
217 struct GNUNET_MESH_Tunnel *
218 GNUNET_MESH_peer_request_connect_all (struct GNUNET_MESH_Handle *h,
219 struct GNUNET_TIME_Relative timeout,
220 unsigned int num_peers,
221 const struct GNUNET_PeerIdentity *peers,
222 GNUNET_MESH_TunnelConnectHandler connect_handler,
223 GNUNET_MESH_TunnelDisconnectHandler disconnect_handler,
228 * Request that a peer should be added to the tunnel. The existing
229 * connect handler will be called ONCE with either success or failure.
231 * @param tunnel handle to existing tunnel
232 * @param timeout how long to try to establish a connection
233 * @param peer peer to add
236 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
237 struct GNUNET_TIME_Relative timeout,
238 const struct GNUNET_PeerIdentity *peer);
242 * Request that the mesh should try to connect to a peer supporting the given
245 * @param h mesh handle
246 * @param timeout how long to try to establish a connection
247 * @param message_type message type that must be supported by the peer (MESH should
248 * discover peer in proximity handling this type)
249 * @param connect_handler function to call on successful connect (or timeout);
250 * will be called for EACH of the peers in the list and
251 * once at the end with 'NULL' on timeout or once we've connected
252 * to each of the peers in the list
253 * @param disconnect_handler function called if a peer drops out of the tunnel;
254 * the mesh will NOT try to add it back automatically
255 * @param handler_cls closure for handler
256 * @return NULL on error (handler will not be called), otherwise handle for cancellation
258 struct GNUNET_MESH_Tunnel *
259 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Handle *h,
260 struct GNUNET_TIME_Relative timeout,
261 uint16_t message_type,
262 GNUNET_MESH_TunnelConnectHandler connect_handler,
263 GNUNET_MESH_TunnelDisconnectHandler disconnect_handler,
268 * Cancel a pending request to connect to a particular peer. Destroys the
271 * @param req request handle that was returned for the original request
274 GNUNET_MESH_peer_request_connect_cancel (struct GNUNET_MESH_Tunnel *req);
278 * Handle for a transmission request.
280 struct GNUNET_MESH_TransmitHandle;
284 * Ask the mesh to call "notify" once it is ready to transmit the
285 * given number of bytes to the specified "target". If we are not yet
286 * connected to the specified peer, a call to this function will cause
287 * us to try to establish a connection.
289 * @param tunnel tunnel to use for transmission
290 * @param cork is corking allowed for this transmission?
291 * @param priority how important is the message?
292 * @param maxdelay how long can the message wait?
293 * @param notify_size how many bytes of buffer space does notify want?
294 * @param notify function to call when buffer space is available;
295 * will be called with NULL on timeout or if the overall queue
296 * for this peer is larger than queue_size and this is currently
297 * the message with the lowest priority
298 * @param notify_cls closure for notify
299 * @return non-NULL if the notify callback was queued,
300 * NULL if we can not even queue the request (insufficient
301 * memory); if NULL is returned, "notify" will NOT be called.
303 struct GNUNET_MESH_TransmitHandle *
304 GNUNET_MESH_notify_transmit_ready (struct
314 GNUNET_CONNECTION_TransmitReadyNotify
321 * Cancel the specified transmission-ready notification.
323 * @param th handle that was returned by "notify_transmit_ready".
326 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle
330 #if 0 /* keep Emacsens' auto-indent happy */
337 /* ifndef GNUNET_MESH_SERVICE_H */
339 /* end of gnunet_mesh_service.h */