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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
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)
70 typedef int (*GNUNET_MESH_MessageCallback) (void *cls,
71 struct GNUNET_MESH_Tunnel * tunnel,
73 const struct GNUNET_PeerIdentity *
75 const struct GNUNET_MessageHeader *
78 GNUNET_ATS_Information *
83 * Message handler. Each struct specifies how to handle on particular
84 * type of message received.
86 struct GNUNET_MESH_MessageHandler
89 * Function to call for messages of "type".
91 GNUNET_MESH_MessageCallback callback;
94 * Type of the message this handler covers.
99 * Expected size of messages of this type. Use 0 for variable-size.
100 * If non-zero, messages of the given type will be discarded if they
101 * do not have the right size.
103 uint16_t expected_size;
109 * Method called whenever another peer has added us to a tunnel
110 * the other peer initiated.
113 * @param tunnel new handle to the tunnel
114 * @param initiator peer that started the tunnel
115 * @param atsi performance information for the tunnel
116 * @return initial tunnel context for the tunnel
117 * (can be NULL -- that's not an error)
119 typedef void *(GNUNET_MESH_InboundTunnelNotificationHandler) (void *cls,
127 GNUNET_ATS_Information
132 * Function called whenever an inbound tunnel is destroyed. Should clean up
133 * any associated state.
135 * @param cls closure (set from GNUNET_MESH_connect)
136 * @param tunnel connection to the other end (henceforth invalid)
137 * @param tunnel_ctx place where local state associated
138 * with the tunnel is stored
140 typedef void (GNUNET_MESH_TunnelEndHandler) (void *cls,
141 const struct GNUNET_MESH_Tunnel *
142 tunnel, void *tunnel_ctx);
146 * Type for an application. Values defined in gnunet_applications.h
148 typedef uint32_t GNUNET_MESH_ApplicationType;
152 * Connect to the mesh service.
154 * @param cfg configuration to use
155 * @param queue_size size of the data message queue, shared among all tunnels
156 * (each tunnel is guaranteed to accept at least one message,
157 * no matter what is the status of other tunnels)
158 * @param cls closure for the various callbacks that follow
159 * (including handlers in the handlers array)
160 * @param new_tunnel function called when an *inbound* tunnel is created
161 * @param cleaner function called when an *inbound* tunnel is destroyed
162 * @param handlers callbacks for messages we care about, NULL-terminated
163 * note that the mesh is allowed to drop notifications about
164 * inbound messages if the client does not process them fast
165 * enough (for this notification type, a bounded queue is used)
166 * @param stypes list of the applications that this client claims to provide
167 * @return handle to the mesh service NULL on error
168 * (in this case, init is never called)
170 struct GNUNET_MESH_Handle *
171 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
172 unsigned int queue_size, void *cls,
173 GNUNET_MESH_InboundTunnelNotificationHandler new_tunnel,
174 GNUNET_MESH_TunnelEndHandler cleaner,
175 const struct GNUNET_MESH_MessageHandler *handlers,
176 const GNUNET_MESH_ApplicationType *stypes);
180 * Disconnect from the mesh service.
182 * @param handle connection to mesh to disconnect
185 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle);
189 * Method called whenever a peer has disconnected from the tunnel.
192 * @param peer peer identity the tunnel stopped working with
194 typedef void (*GNUNET_MESH_PeerDisconnectHandler) (void *cls,
196 GNUNET_PeerIdentity * peer);
200 * Method called whenever a peer has connected to the tunnel.
201 * TODO: change to typedef int? to let client allow the new peer or not
204 * @param peer peer identity the tunnel was created to, NULL on timeout
205 * @param atsi performance data for the connection
207 typedef void (*GNUNET_MESH_PeerConnectHandler) (void *cls,
208 const struct GNUNET_PeerIdentity
211 GNUNET_ATS_Information
217 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
220 * @param h mesh handle
221 * @param tunnel_ctx client's tunnel context to associate with the tunnel
222 * @param connect_handler function to call when peers are actually connected
223 * @param disconnect_handler function to call when peers are disconnected
224 * @param handler_cls closure for connect/disconnect handlers
226 struct GNUNET_MESH_Tunnel *
227 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h, void *tunnel_ctx,
228 GNUNET_MESH_PeerConnectHandler connect_handler,
229 GNUNET_MESH_PeerDisconnectHandler disconnect_handler,
233 * Destroy an existing tunnel.
235 * @param tunnel tunnel handle
238 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tunnel);
242 * Request that a peer should be added to the tunnel. The connect handler
243 * will be called when the peer connects
245 * @param tunnel handle to existing tunnel
246 * @param peer peer to add
249 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
250 const struct GNUNET_PeerIdentity *peer);
254 * Request that a peer should be removed from the tunnel. The existing
255 * disconnect handler will be called ONCE if we were connected.
257 * @param tunnel handle to existing tunnel
258 * @param peer peer to remove
261 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
262 const struct GNUNET_PeerIdentity *peer);
266 * Request that the mesh should try to connect to a peer supporting the given
269 * @param tunnel handle to existing tunnel
270 * @param app_type application type that must be supported by the peer
271 * (MESH should discover peer in proximity handling this type)
274 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
275 GNUNET_MESH_ApplicationType app_type);
279 * Handle for a transmission request.
281 struct GNUNET_MESH_TransmitHandle;
285 * Ask the mesh to call "notify" once it is ready to transmit the
286 * given number of bytes to the specified tunnel or target.
288 * @param tunnel tunnel to use for transmission
289 * @param cork is corking allowed for this transmission?
290 * @param priority how important is the message?
291 * @param maxdelay how long can the message wait?
292 * @param target destination for the message
293 * NULL for multicast to all tunnel targets
294 * @param notify_size how many bytes of buffer space does notify want?
295 * @param notify function to call when buffer space is available;
296 * will be called with NULL on timeout or if the overall queue
297 * for this peer is larger than queue_size and this is currently
298 * the message with the lowest priority
299 * @param notify_cls closure for notify
300 * @return non-NULL if the notify callback was queued,
301 * NULL if we can not even queue the request (insufficient
302 * memory); if NULL is returned, "notify" will NOT be called.
304 struct GNUNET_MESH_TransmitHandle *
305 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
307 struct GNUNET_TIME_Relative maxdelay,
308 const struct GNUNET_PeerIdentity *target,
310 GNUNET_CONNECTION_TransmitReadyNotify notify,
315 * Cancel the specified transmission-ready notification.
317 * @param th handle that was returned by "notify_transmit_ready".
320 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle
324 #if 0 /* keep Emacsens' auto-indent happy */
331 /* ifndef GNUNET_MESH_SERVICE_H */
333 /* end of gnunet_mesh_service.h */