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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 sender who sent the message
65 * @param message the actual message
66 * @param atsi performance data for the connection
67 * @return GNUNET_OK to keep the connection open,
68 * GNUNET_SYSERR to close it (signal serious error)
71 (*GNUNET_MESH_MessageCallback) (void *cls,
72 struct GNUNET_MESH_Tunnel *tunnel,
74 const struct GNUNET_PeerIdentity *sender,
75 const struct GNUNET_MessageHeader *message,
76 const struct GNUNET_TRANSPORT_ATS_Information *atsi);
80 * Message handler. Each struct specifies how to handle on particular
81 * type of message received.
83 struct GNUNET_MESH_MessageHandler
86 * Function to call for messages of "type".
88 GNUNET_MESH_MessageCallback callback;
91 * Type of the message this handler covers.
96 * Expected size of messages of this type. Use 0 for variable-size.
97 * If non-zero, messages of the given type will be discarded if they
98 * do not have the right size.
100 uint16_t expected_size;
106 * Function called whenever an inbound tunnel is destroyed. Should clean up
107 * any associated state.
109 * @param cls closure (set from GNUNET_MESH_connect)
110 * @param tunnel connection to the other end (henceforth invalid)
111 * @param tunnel_ctx place where local state associated with the tunnel is stored
113 typedef void (GNUNET_MESH_TunnelEndHandler)(void *cls,
114 const struct GNUNET_MESH_Tunnel *tunnel,
119 * Type for an application. Values defined in gnunet_applications.h
121 typedef uint32_t GNUNET_MESH_ApplicationType;
125 * Connect to the mesh service.
127 * @param cfg configuration to use
128 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
129 * @param cleaner function called when an *inbound* tunnel is destroyed
130 * @param handlers callbacks for messages we care about, NULL-terminated
131 * note that the mesh is allowed to drop notifications about inbound
132 * messages if the client does not process them fast enough (for this
133 * notification type, a bounded queue is used)
134 * @return handle to the mesh service
135 * NULL on error (in this case, init is never called)
137 struct GNUNET_MESH_Handle *
138 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
140 GNUNET_MESH_TunnelEndHandler cleaner,
141 const struct GNUNET_MESH_MessageHandler *handlers,
142 const GNUNET_MESH_ApplicationType *stypes);
145 * Get the peer on the other side of this tunnel if it is just one. Return NULL otherwise
148 * @param tunnel the tunnel
149 * @return the peer or NULL
151 const struct GNUNET_PeerIdentity*
152 GNUNET_MESH_get_peer (const struct GNUNET_MESH_Tunnel* tunnel);
156 * Disconnect from the mesh service.
158 * @param handle connection to mesh to disconnect
160 void GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle);
164 * Method called whenever a tunnel falls apart.
167 * @param peer peer identity the tunnel stopped working with
169 typedef void (*GNUNET_MESH_TunnelDisconnectHandler) (void *cls,
170 const struct GNUNET_PeerIdentity *peer);
174 * Method called whenever a tunnel is established.
177 * @param peer peer identity the tunnel was created to, NULL on timeout
178 * @param atsi performance data for the connection
180 typedef void (*GNUNET_MESH_TunnelConnectHandler) (void *cls,
181 const struct GNUNET_PeerIdentity *peer,
182 const struct GNUNET_TRANSPORT_ATS_Information *atsi);
187 * Create a new tunnel (we're initiator and will be allowed to add/remove peers and
190 * @param h mesh handle
191 * @param connect_handler function to call when peers are actually connected
192 * @param disconnect_handler function to call when peers are disconnected
193 * @param handler_cls closure for connect/disconnect handlers
195 struct GNUNET_MESH_Tunnel *
196 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h,
197 GNUNET_MESH_TunnelConnectHandler connect_handler,
198 GNUNET_MESH_TunnelDisconnectHandler disconnect_handler,
202 * Destroy an existing tunnel.
204 * @param tun tunnel handle
207 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tun);
211 * Request that a peer should be added to the tunnel. The existing
212 * connect handler will be called ONCE with either success or failure.
214 * @param tunnel handle to existing tunnel
215 * @param timeout how long to try to establish a connection
216 * @param peer peer to add
219 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
220 struct GNUNET_TIME_Relative timeout,
221 const struct GNUNET_PeerIdentity *peer);
225 * Request that a peer should be removed from the tunnel. The existing
226 * disconnect handler will be called ONCE if we were connected.
228 * @param tunnel handle to existing tunnel
229 * @param peer peer to remove
232 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
233 const struct GNUNET_PeerIdentity *peer);
237 * Request that the mesh should try to connect to a peer supporting the given
240 * @param tunnel handle to existing tunnel
241 * @param timeout how long to try to establish a connection
242 * @param app_type application type that must be supported by the peer (MESH should
243 * discover peer in proximity handling this type)
244 * @return NULL on error (handler will not be called), otherwise handle for cancellation
246 struct GNUNET_MESH_Tunnel *
247 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
248 struct GNUNET_TIME_Relative timeout,
249 GNUNET_MESH_ApplicationType app_type);
253 * Handle for a transmission request.
255 struct GNUNET_MESH_TransmitHandle;
259 * Ask the mesh to call "notify" once it is ready to transmit the
260 * given number of bytes to the specified "target". If we are not yet
261 * connected to the specified peer, a call to this function will cause
262 * us to try to establish a connection.
264 * @param tunnel tunnel to use for transmission
265 * @param cork is corking allowed for this transmission?
266 * @param priority how important is the message?
267 * @param maxdelay how long can the message wait?
268 * @param target destination for the message, NULL for multicast to all tunnel targets
269 * @param notify_size how many bytes of buffer space does notify want?
270 * @param notify function to call when buffer space is available;
271 * will be called with NULL on timeout or if the overall queue
272 * for this peer is larger than queue_size and this is currently
273 * the message with the lowest priority
274 * @param notify_cls closure for notify
275 * @return non-NULL if the notify callback was queued,
276 * NULL if we can not even queue the request (insufficient
277 * memory); if NULL is returned, "notify" will NOT be called.
279 struct GNUNET_MESH_TransmitHandle *
280 GNUNET_MESH_notify_transmit_ready (struct
288 const struct GNUNET_PeerIdentity *target,
291 GNUNET_CONNECTION_TransmitReadyNotify
298 * Cancel the specified transmission-ready notification.
300 * @param th handle that was returned by "notify_transmit_ready".
303 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle
307 #if 0 /* keep Emacsens' auto-indent happy */
314 /* ifndef GNUNET_MESH_SERVICE_H */
316 /* end of gnunet_mesh_service.h */