2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
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22 * @file mesh/mesh_api_new.c
23 * @brief mesh api: client implementation of mesh service
24 * @author Bartlomiej Polot
29 * - AUXILIARY FUNCTIONS
32 * - API CALL DEFINITIONS
39 #if 0 /* keep Emacsens' auto-indent happy */
46 #include "gnunet_common.h"
47 #include "gnunet_client_lib.h"
48 #include "gnunet_util_lib.h"
49 #include "gnunet_peer_lib.h"
50 #include "gnunet_mesh_service_new.h"
52 #include "mesh_protocol.h"
54 #define MESH_API_MAX_QUEUE 10
56 /******************************************************************************/
57 /************************ DATA STRUCTURES ****************************/
58 /******************************************************************************/
61 * Transmission queue to the service
63 struct GNUNET_MESH_queue
68 struct GNUNET_MESH_queue *next;
69 struct GNUNET_MESH_queue *prev;
72 * Size of the data to follow
84 * Opaque handle to the service.
86 struct GNUNET_MESH_Handle
89 * Handle to the server connection, to send messages later
91 struct GNUNET_CLIENT_Connection *client;
94 * Set of handlers used for processing incoming messages in the tunnels
96 const struct GNUNET_MESH_MessageHandler *message_handlers;
100 * Set of applications that should be claimed to be offered at this node.
101 * Note that this is just informative, the appropiate handlers must be
102 * registered independently and the mapping is up to the developer of the
103 * client application.
105 const GNUNET_MESH_ApplicationType *applications;
109 * Double linked list of the tunnels this client is connected to.
111 struct GNUNET_MESH_Tunnel *tunnels_head;
112 struct GNUNET_MESH_Tunnel *tunnels_tail;
115 * tid of the next tunnel to create (to avoid reusing IDs often)
117 MESH_TunnelNumber next_tid;
120 * Callback for tunnel disconnection
122 GNUNET_MESH_TunnelEndHandler *cleaner;
125 * Handle to cancel pending transmissions in case of disconnection
127 struct GNUNET_CLIENT_TransmitHandle *th;
130 * Closure for all the handlers given by the client
135 * Messages to send to the service
137 struct GNUNET_MESH_queue *queue_head;
138 struct GNUNET_MESH_queue *queue_tail;
142 * Opaque handle to a tunnel.
144 struct GNUNET_MESH_Tunnel
150 struct GNUNET_MESH_Tunnel *next;
151 struct GNUNET_MESH_Tunnel *prev;
154 * Local ID of the tunnel
156 MESH_TunnelNumber tid;
159 * Owner of the tunnel
161 GNUNET_PEER_Id owner;
164 * Callback to execute when peers connect to the tunnel
166 GNUNET_MESH_TunnelConnectHandler connect_handler;
169 * Callback to execute when peers disconnect to the tunnel
171 GNUNET_MESH_TunnelDisconnectHandler disconnect_handler;
174 * All peers added to the tunnel
176 GNUNET_PEER_Id *peers;
179 * Number of peer added to the tunnel
184 * Closure for the connect/disconnect handlers
189 * Handle to the mesh this tunnel belongs to
191 struct GNUNET_MESH_Handle *mesh;
194 struct GNUNET_MESH_TransmitHandle
196 struct GNUNET_MESH_Tunnel *t;
197 struct GNUNET_MESH_queue *q;
200 /******************************************************************************/
201 /*********************** AUXILIARY FUNCTIONS *************************/
202 /******************************************************************************/
205 * Get the tunnel handler for the tunnel specified by id from the given handle
206 * @param h Mesh handle
207 * @param tid ID of the wanted tunnel
208 * @return handle to the required tunnel or NULL if not found
210 static struct GNUNET_MESH_Tunnel *
211 retrieve_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
213 struct GNUNET_MESH_Tunnel *t;
226 * Get the length of the transmission queue
227 * @param h mesh handle whose queue is to be measured
230 get_queue_length (struct GNUNET_MESH_Handle *h)
232 struct GNUNET_MESH_queue *q;
236 for (q = h->queue_head, i = 0; NULL != q; q = q->next, i++);
242 /******************************************************************************/
243 /*********************** RECEIVE HANDLERS ****************************/
244 /******************************************************************************/
247 * Process the new tunnel notification and add it to the tunnels in the handle
249 * @param h The mesh handle
250 * @param msg A message with the details of the new incoming tunnel
253 process_tunnel_create (struct GNUNET_MESH_Handle *h,
254 const struct GNUNET_MESH_TunnelMessage *msg)
256 struct GNUNET_MESH_Tunnel *t;
257 MESH_TunnelNumber tid;
259 tid = ntohl (msg->tunnel_id);
260 if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_MARK)
262 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
263 "MESH: received an incoming tunnel with tid in local range (%X)\n",
266 return; //FIXME abort? reconnect?
268 t = GNUNET_malloc (sizeof (struct GNUNET_MESH_Tunnel));
278 * Process the new peer event and notify the upper level of it
280 * @param h The mesh handle
281 * @param msg A message with the details of the peer event
284 process_peer_event (struct GNUNET_MESH_Handle *h,
285 const struct GNUNET_MESH_PeerControl *msg)
287 struct GNUNET_MESH_Tunnel *t;
290 size = ntohs (msg->header.size);
291 if (size != sizeof (struct GNUNET_MESH_PeerControl))
296 t = retrieve_tunnel (h, ntohl (msg->tunnel_id));
302 if (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_CONNECTED == msg->header.type)
304 if (NULL != t->connect_handler)
306 t->connect_handler (t->cls, &msg->peer, NULL); /* FIXME atsi */
311 if (NULL != t->disconnect_handler)
313 t->disconnect_handler (t->cls, &msg->peer);
320 * Process the incoming data packets
322 * @param h The mesh handle
323 * @param msh A message encapsulating the data
326 process_incoming_data (struct GNUNET_MESH_Handle *h,
327 const struct GNUNET_MessageHeader *message)
329 const struct GNUNET_MessageHeader *payload;
330 const struct GNUNET_MESH_MessageHandler *handler;
331 const struct GNUNET_PeerIdentity *peer;
332 struct GNUNET_MESH_Unicast *ucast;
333 struct GNUNET_MESH_Multicast *mcast;
334 struct GNUNET_MESH_ToOrigin *to_orig;
335 struct GNUNET_MESH_Tunnel *t;
339 type = ntohs (message->type);
342 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
343 ucast = (struct GNUNET_MESH_Unicast *) message;
344 t = retrieve_tunnel (h, ntohl (ucast->tid));
345 payload = (struct GNUNET_MessageHeader *) &ucast[1];
348 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
349 mcast = (struct GNUNET_MESH_Multicast *) message;
350 t = retrieve_tunnel (h, ntohl (mcast->tid));
351 payload = (struct GNUNET_MessageHeader *) &mcast[1];
354 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
355 to_orig = (struct GNUNET_MESH_ToOrigin *) message;
356 t = retrieve_tunnel (h, ntohl (to_orig->tid));
357 payload = (struct GNUNET_MessageHeader *) &to_orig[1];
358 peer = &to_orig->sender;
369 for (i = 0; i < h->n_handlers; i++)
371 handler = &h->message_handlers[i];
372 if (handler->type == type)
374 if (GNUNET_OK == handler->callback (h->cls, t, NULL, /* FIXME ctx */
375 peer, payload, NULL)) /* FIXME atsi */
377 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
378 "MESH: callback completed successfully\n");
382 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
383 "MESH: callback caused disconnection\n");
384 GNUNET_MESH_disconnect (h);
393 * Function to process all messages received from the service
396 * @param msg message received, NULL on timeout or fatal error
399 msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
401 struct GNUNET_MESH_Handle *h = cls;
403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: received a message from MESH\n");
410 switch (ntohs (msg->type))
412 /* Notify of a new incoming tunnel */
413 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE:
414 process_tunnel_create (h, (struct GNUNET_MESH_TunnelMessage *) msg);
416 /* Notify of a new peer or a peer disconnect in the tunnel */
417 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_CONNECTED:
418 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED:
419 process_peer_event (h, (struct GNUNET_MESH_PeerControl *) msg);
421 /* Notify of a new data packet in the tunnel */
422 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
423 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
424 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
425 process_incoming_data (h, msg);
427 /* We shouldn't get any other packages, log and ignore */
429 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
430 "MESH: unsolicited message form service (type %d)\n",
434 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: message processed\n");
435 GNUNET_CLIENT_receive (h->client, &msg_received, h,
436 GNUNET_TIME_UNIT_FOREVER_REL);
441 /******************************************************************************/
442 /************************ SEND FUNCTIONS ****************************/
443 /******************************************************************************/
446 * Function called to send a message to the service.
447 * "buf" will be NULL and "size" zero if the socket was closed for writing in
450 * @param cls closure, the mesh handle
451 * @param size number of bytes available in buf
452 * @param buf where the callee should write the connect message
453 * @return number of bytes written to buf
456 send_raw (void *cls, size_t size, void *buf)
458 struct GNUNET_MESH_Handle *h = cls;
459 struct GNUNET_MESH_queue *q;
461 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() Buffer %u\n", size);
463 if (0 == size || NULL == buf)
465 // FIXME: disconnect, reconnect, retry?
469 if (sizeof (struct GNUNET_MessageHeader) > size)
472 GNUNET_assert (sizeof (struct GNUNET_MessageHeader) > q->size);
473 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client, q->size,
474 GNUNET_TIME_UNIT_FOREVER_REL,
475 GNUNET_YES, &send_raw, h);
478 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: type: %i\n",
479 ntohs(((struct GNUNET_MessageHeader *)q->data)->type));
480 memcpy(buf, q->data, q->size);
481 GNUNET_free (q->data);
483 GNUNET_CONTAINER_DLL_remove(h->queue_head, h->queue_tail, q);
485 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: size: %u\n", size);
487 if (NULL != h->queue_head)
489 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: next size: %u\n",
490 h->queue_head->size);
491 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client, h->queue_head->size,
492 GNUNET_TIME_UNIT_FOREVER_REL,
493 GNUNET_YES, &send_raw, h);
495 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() END\n");
501 * Auxiliary function to send a packet to the service
502 * Takes care of creating a new queue element and calling the tmt_rdy function
504 * @param h mesh handle
505 * @param size size of the packet to transmit
506 * @param data packet itself
509 send_packet (struct GNUNET_MESH_Handle *h, size_t size, void *data)
511 struct GNUNET_MESH_queue *q;
513 q = GNUNET_malloc (sizeof (struct GNUNET_MESH_queue));
516 GNUNET_CONTAINER_DLL_insert_tail (h->queue_head, h->queue_tail, q);
519 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client, size,
520 GNUNET_TIME_UNIT_FOREVER_REL,
521 GNUNET_YES, &send_raw, h);
525 /******************************************************************************/
526 /********************** API CALL DEFINITIONS *************************/
527 /******************************************************************************/
530 * Connect to the mesh service.
532 * @param cfg configuration to use
533 * @param cls closure for the various callbacks that follow
534 * (including handlers in the handlers array)
535 * @param cleaner function called when an *inbound* tunnel is destroyed
536 * @param handlers callbacks for messages we care about, NULL-terminated
537 * note that the mesh is allowed to drop notifications about
538 * inbound messages if the client does not process them fast
539 * enough (for this notification type, a bounded queue is used)
540 * @param stypes Application Types the client claims to offer
541 * @return handle to the mesh service
542 * NULL on error (in this case, init is never called)
544 struct GNUNET_MESH_Handle *
545 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg, void *cls,
546 GNUNET_MESH_TunnelEndHandler cleaner,
547 const struct GNUNET_MESH_MessageHandler *handlers,
548 const GNUNET_MESH_ApplicationType *stypes)
550 struct GNUNET_MESH_Handle *h;
551 struct GNUNET_MESH_ClientConnect *msg;
552 GNUNET_MESH_ApplicationType *apps;
558 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect()\n");
559 h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
561 h->cleaner = cleaner;
562 h->client = GNUNET_CLIENT_connect ("mesh", cfg);
563 if (h->client == NULL)
571 h->message_handlers = handlers;
572 h->applications = stypes;
573 h->next_tid = 0x80000000;
575 /* count handlers and apps, calculate size */
576 for (h->n_handlers = 0; handlers[h->n_handlers].type; h->n_handlers++) ;
577 for (h->n_applications = 0; stypes[h->n_applications]; h->n_applications++) ;
578 size = sizeof (struct GNUNET_MESH_ClientConnect);
579 size += h->n_handlers * sizeof (uint16_t);
580 size += h->n_applications * sizeof (GNUNET_MESH_ApplicationType);
582 /* build connection packet */
583 msg = GNUNET_malloc(size);
584 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
585 msg->header.size = htons (size);
586 types = (uint16_t *) &msg[1];
587 for (ntypes = 0; ntypes < h->n_handlers; ntypes++)
589 types[ntypes] = h->message_handlers[ntypes].type;
591 apps = (GNUNET_MESH_ApplicationType *) &types[ntypes];
592 for (napps = 0; napps < h->n_applications; napps++)
594 apps[napps] = h->applications[napps];
596 msg->applications = htons (napps);
597 msg->types = htons (ntypes);
599 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
600 "mesh: Sending %lu bytes long message %d types and %d apps\n",
601 ntohs (msg->header.size), ntypes, napps);
603 send_packet(h, size, msg);
605 GNUNET_CLIENT_receive (h->client, &msg_received, h,
606 GNUNET_TIME_UNIT_FOREVER_REL);
608 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect() END\n");
615 * Disconnect from the mesh service.
617 * @param handle connection to mesh to disconnect
620 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
622 if (NULL != handle->th)
624 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
626 if (NULL != handle->client)
628 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
630 GNUNET_free (handle);
635 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
638 * @param h mesh handle
639 * @param connect_handler function to call when peers are actually connected
640 * @param disconnect_handler function to call when peers are disconnected
641 * @param handler_cls closure for connect/disconnect handlers
643 struct GNUNET_MESH_Tunnel *
644 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h,
645 GNUNET_MESH_TunnelConnectHandler connect_handler,
646 GNUNET_MESH_TunnelDisconnectHandler
647 disconnect_handler, void *handler_cls)
649 struct GNUNET_MESH_Tunnel *t;
650 struct GNUNET_MESH_TunnelMessage *msg;
652 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Creating new tunnel\n");
653 t = GNUNET_malloc (sizeof (struct GNUNET_MESH_Tunnel));
655 t->connect_handler = connect_handler;
656 t->disconnect_handler = disconnect_handler;
657 t->cls = handler_cls;
659 t->tid = h->next_tid++;
660 h->next_tid |= GNUNET_MESH_LOCAL_TUNNEL_ID_MARK; // keep in range
662 msg = GNUNET_malloc (sizeof (struct GNUNET_MESH_TunnelMessage));
663 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
664 msg->header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
665 msg->tunnel_id = htonl (t->tid);
667 send_packet(h, sizeof (struct GNUNET_MESH_TunnelMessage), msg);
674 * Destroy an existing tunnel.
676 * @param tun tunnel handle
679 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tun)
681 struct GNUNET_MESH_Handle *h;
682 struct GNUNET_MESH_TunnelMessage *msg;
684 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Destroying tunnel\n");
687 msg = GNUNET_malloc (sizeof (struct GNUNET_MESH_TunnelMessage));
688 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
689 msg->header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
690 msg->tunnel_id = htonl (tun->tid);
694 send_packet(h, sizeof (struct GNUNET_MESH_TunnelMessage), msg);
699 * Request that a peer should be added to the tunnel. The existing
700 * connect handler will be called ONCE with either success or failure.
702 * @param tunnel handle to existing tunnel
703 * @param timeout how long to try to establish a connection
704 * @param peer peer to add
707 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
708 struct GNUNET_TIME_Relative timeout,
709 const struct GNUNET_PeerIdentity *peer)
711 struct GNUNET_MESH_PeerControl *msg;
712 GNUNET_PEER_Id peer_id;
715 peer_id = GNUNET_PEER_intern (peer);
716 for (i = 0; i < tunnel->npeers; i++)
718 if (tunnel->peers[i] == peer_id)
720 GNUNET_PEER_change_rc (peer_id, -1);
725 tunnel->peers = GNUNET_realloc (tunnel->peers,
726 tunnel->npeers * sizeof (GNUNET_PEER_Id));
727 tunnel->peers[tunnel->npeers - 1] = peer_id;
729 msg = GNUNET_malloc (sizeof (struct GNUNET_MESH_PeerControl));
730 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
731 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_ADD);
732 msg->tunnel_id = htonl(tunnel->tid);
733 memcpy (&msg->peer, peer, sizeof (struct GNUNET_PeerIdentity));
735 send_packet(tunnel->mesh, sizeof (struct GNUNET_MESH_PeerControl), msg);
737 // tunnel->connect_handler (tunnel->cls, peer, NULL); FIXME call this later
738 // TODO: remember timeout
744 * Request that a peer should be removed from the tunnel. The existing
745 * disconnect handler will be called ONCE if we were connected.
747 * @param tunnel handle to existing tunnel
748 * @param peer peer to remove
751 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
752 const struct GNUNET_PeerIdentity *peer)
754 struct GNUNET_MESH_PeerControl *msg;
755 GNUNET_PEER_Id peer_id;
758 peer_id = GNUNET_PEER_search (peer);
759 if (0 == peer_id) return;
760 for (i = 0; i < tunnel->npeers; i++)
762 if (tunnel->peers[i] == peer_id)
764 GNUNET_PEER_change_rc (peer_id, -1);
766 while (i < tunnel->npeers)
768 tunnel->peers[i] = tunnel->peers[i+1];
771 tunnel->peers = GNUNET_realloc (tunnel->peers,
772 tunnel->npeers * sizeof (GNUNET_PEER_Id));
773 msg = GNUNET_malloc (sizeof (struct GNUNET_MESH_PeerControl));
774 msg->header.size = htons(sizeof (struct GNUNET_MESH_PeerControl));
775 msg->header.type = htons(GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_DEL);
776 msg->tunnel_id = htonl(tunnel->tid);
777 memcpy (&msg->peer, peer, sizeof (struct GNUNET_PeerIdentity));
779 send_packet(tunnel->mesh, sizeof (struct GNUNET_MESH_PeerControl), msg);
784 // TODO: remember timeout
790 * Request that the mesh should try to connect to a peer supporting the given
793 * @param tunnel handle to existing tunnel
794 * @param timeout how long to try to establish a connection
795 * @param app_type application type that must be supported by the peer (MESH
796 * should discover peer in proximity handling this type)
799 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
800 struct GNUNET_TIME_Relative timeout,
801 GNUNET_MESH_ApplicationType app_type)
803 struct GNUNET_MESH_ConnectPeerByType *msg;
804 msg = GNUNET_malloc (sizeof (struct GNUNET_MESH_ConnectPeerByType));
805 msg->header.size = htons(sizeof (struct GNUNET_MESH_ConnectPeerByType));
806 msg->header.type = htons(GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_BY_TYPE);
807 msg->tunnel_id = htonl(tunnel->tid);
808 msg->type = htonl(app_type);
810 send_packet(tunnel->mesh, sizeof (struct GNUNET_MESH_ConnectPeerByType), msg);
811 // TODO: remember timeout
817 * Ask the mesh to call "notify" once it is ready to transmit the
818 * given number of bytes to the specified "target". If we are not yet
819 * connected to the specified peer, a call to this function will cause
820 * us to try to establish a connection.
822 * @param tunnel tunnel to use for transmission
823 * @param cork is corking allowed for this transmission?
824 * @param priority how important is the message?
825 * @param maxdelay how long can the message wait?
826 * @param target destination for the message,
827 * NULL for multicast to all tunnel targets
828 * @param notify_size how many bytes of buffer space does notify want?
829 * @param notify function to call when buffer space is available;
830 * will be called with NULL on timeout or if the overall queue
831 * for this peer is larger than queue_size and this is currently
832 * the message with the lowest priority
833 * @param notify_cls closure for notify
834 * @return non-NULL if the notify callback was queued,
835 * NULL if we can not even queue the request (insufficient
836 * memory); if NULL is returned, "notify" will NOT be called.
838 struct GNUNET_MESH_TransmitHandle *
839 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
841 struct GNUNET_TIME_Relative maxdelay,
842 const struct GNUNET_PeerIdentity *target,
844 GNUNET_CONNECTION_TransmitReadyNotify notify,
847 struct GNUNET_MESH_TransmitHandle *handle;
849 handle = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle));
851 handle->q = GNUNET_malloc (sizeof (struct GNUNET_MESH_queue));
852 handle->q->size = notify_size;
853 handle->q->data = GNUNET_malloc (notify_size);
855 if (get_queue_length(tunnel->mesh) < MESH_API_MAX_QUEUE)
857 notify (notify_cls, notify_size, handle->q->data);
858 GNUNET_CONTAINER_DLL_insert_tail(tunnel->mesh->queue_head,
859 tunnel->mesh->queue_tail,
862 // TODO dataless - queue
870 * Cancel the specified transmission-ready notification.
872 * @param th handle that was returned by "notify_transmit_ready".
875 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th)
877 GNUNET_CONTAINER_DLL_remove(th->t->mesh->queue_head,
878 th->t->mesh->queue_tail,
880 // TODO remove from dataless queue
881 GNUNET_free (th->q->data);
887 #if 0 /* keep Emacsens' auto-indent happy */