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3 (C) 2009 Christian Grothoff (and other contributing authors)
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13 General Public License for more details.
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22 * @file core/core_api.c
23 * @brief core service; this is the main API for encrypted P2P
25 * @author Christian Grothoff
28 #include "gnunet_core_service.h"
33 * Context for the core service connection.
35 struct GNUNET_CORE_Handle
41 struct GNUNET_SCHEDULER_Handle *sched;
44 * Configuration we're using.
46 const struct GNUNET_CONFIGURATION_Handle *cfg;
49 * Closure for the various callbacks.
54 * Function to call once we've handshaked with the core service.
56 GNUNET_CORE_StartupCallback init;
59 * Function to call whenever we're notified about a peer connecting.
61 GNUNET_CORE_ConnectEventHandler connects;
64 * Function to call whenever we're notified about a peer disconnecting.
66 GNUNET_CORE_DisconnectEventHandler disconnects;
69 * Function to call whenever we receive an inbound message.
71 GNUNET_CORE_MessageCallback inbound_notify;
74 * Function to call whenever we receive an outbound message.
76 GNUNET_CORE_MessageCallback outbound_notify;
79 * Function handlers for messages of particular type.
81 const struct GNUNET_CORE_MessageHandler *handlers;
84 * Our connection to the service for notifications.
86 struct GNUNET_CLIENT_Connection *client_notifications;
89 * Handle for our current transmission request.
91 struct GNUNET_CLIENT_TransmitHandle *th;
94 * Head of doubly-linked list of pending requests.
96 struct GNUNET_CORE_TransmitHandle *pending_head;
99 * Tail of doubly-linked list of pending requests.
101 struct GNUNET_CORE_TransmitHandle *pending_tail;
104 * Currently submitted request (or NULL)
106 struct GNUNET_CORE_TransmitHandle *submitted;
109 * Currently submitted request based on solicitation (or NULL)
111 struct GNUNET_CORE_TransmitHandle *solicit_transmit_req;
114 * Buffer where we store a message for transmission in response
115 * to a traffic solicitation (or NULL).
117 char *solicit_buffer;
120 * How long to wait until we time out the connection attempt?
122 struct GNUNET_TIME_Absolute startup_timeout;
125 * ID of reconnect task (if any).
127 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
130 * Number of entries in the handlers array.
135 * For inbound notifications without a specific handler, do
136 * we expect to only receive headers?
138 int inbound_hdr_only;
141 * For outbound notifications without a specific handler, do
142 * we expect to only receive headers?
144 int outbound_hdr_only;
147 * Are we currently disconnected and hence unable to forward
155 * Handle for a transmission request.
157 struct GNUNET_CORE_TransmitHandle
161 * We keep active transmit handles in a doubly-linked list.
163 struct GNUNET_CORE_TransmitHandle *next;
166 * We keep active transmit handles in a doubly-linked list.
168 struct GNUNET_CORE_TransmitHandle *prev;
171 * Corresponding core handle.
173 struct GNUNET_CORE_Handle *ch;
176 * Function that will be called to get the actual request
177 * (once we are ready to transmit this request to the core).
178 * The function will be called with a NULL buffer to signal
181 GNUNET_CONNECTION_TransmitReadyNotify get_message;
184 * Closure for get_message.
186 void *get_message_cls;
189 * If this entry is for a transmission request, pointer
190 * to the notify callback; otherwise NULL.
192 GNUNET_CONNECTION_TransmitReadyNotify notify;
195 * Closure for notify.
200 * Peer the request is about.
202 struct GNUNET_PeerIdentity peer;
205 * Timeout for this handle.
207 struct GNUNET_TIME_Absolute timeout;
210 * ID of timeout task.
212 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
215 * How important is this message?
220 * Size of this request.
229 reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
233 * Function called when we are ready to transmit our
234 * "START" message (or when this operation timed out).
237 * @param size number of bytes available in buf
238 * @param buf where the callee should write the message
239 * @return number of bytes written to buf
241 static size_t transmit_start (void *cls, size_t size, void *buf);
245 * Our current client connection went down. Clean it up
246 * and try to reconnect!
248 * @param h our handle to the core service
251 reconnect (struct GNUNET_CORE_Handle *h)
253 if (h->client_notifications != NULL)
254 GNUNET_CLIENT_disconnect (h->client_notifications, GNUNET_NO);
255 h->currently_down = GNUNET_YES;
256 h->client_notifications = GNUNET_CLIENT_connect (h->sched, "core", h->cfg);
257 if (h->client_notifications == NULL)
258 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->sched,
259 GNUNET_TIME_UNIT_SECONDS,
263 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client_notifications,
264 sizeof (struct InitMessage) +
265 sizeof (uint16_t) * h->hcnt,
266 GNUNET_TIME_UNIT_SECONDS,
273 * The given request hit its timeout. Remove from the
274 * doubly-linked list and call the respective continuation.
276 * @param cls the transmit handle of the request that timed out
277 * @param tc context, can be NULL (!)
280 timeout_request (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
282 struct GNUNET_CORE_TransmitHandle *th = cls;
284 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
285 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
290 * Function called when we are ready to transmit a request from our
291 * request list (or when this operation timed out).
294 * @param size number of bytes available in buf
295 * @param buf where the callee should write the message
296 * @return number of bytes written to buf
299 request_start (void *cls, size_t size, void *buf)
301 struct GNUNET_CORE_Handle *h = cls;
302 struct GNUNET_CORE_TransmitHandle *th;
306 th = h->pending_head;
309 timeout_request (th, NULL);
312 /* create new timeout task (in case core takes too long to respond!) */
313 th->timeout_task = GNUNET_SCHEDULER_add_delayed (h->sched,
314 GNUNET_TIME_absolute_get_remaining
316 &timeout_request, th);
317 /* remove th from doubly-linked pending list, move to submitted */
318 GNUNET_assert (th->prev == NULL);
319 h->pending_head = th->next;
320 if (th->next == NULL)
321 h->pending_tail = NULL;
323 th->next->prev = NULL;
324 GNUNET_assert (h->submitted == NULL);
326 GNUNET_assert (size >= th->msize);
327 ret = th->get_message (th->get_message_cls, size, buf);
328 GNUNET_assert (ret <= size);
334 * Check the list of pending requests, send the next
338 trigger_next_request (struct GNUNET_CORE_Handle *h)
340 struct GNUNET_CORE_TransmitHandle *th;
342 if (h->currently_down)
345 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
346 "In trigger_next_request, connection currently down...\n");
348 return; /* connection temporarily down */
350 if (NULL == (th = h->pending_head))
351 return; /* no requests pending */
352 GNUNET_assert (NULL == h->th);
353 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
355 GNUNET_SCHEDULER_cancel (h->sched, th->timeout_task);
356 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
358 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client_notifications,
360 GNUNET_TIME_absolute_get_remaining
369 * Handler for notification messages received from the core.
371 * @param cls our "struct GNUNET_CORE_Handle"
372 * @param msg the message received from the core service
375 main_notify_handler (void *cls, const struct GNUNET_MessageHeader *msg)
377 struct GNUNET_CORE_Handle *h = cls;
379 const struct ConnectNotifyMessage *cnm;
380 const struct DisconnectNotifyMessage *dnm;
381 const struct NotifyTrafficMessage *ntm;
382 const struct GNUNET_MessageHeader *em;
385 const struct GNUNET_CORE_MessageHandler *mh;
389 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
391 ("Client was disconnected from core service, trying to reconnect.\n"));
395 msize = ntohs (msg->size);
397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
398 "Processing message of type %u and size %u from core service\n",
399 ntohs (msg->type), msize);
401 switch (ntohs (msg->type))
403 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
404 if (NULL == h->connects)
409 if (msize != sizeof (struct ConnectNotifyMessage))
414 cnm = (const struct ConnectNotifyMessage *) msg;
417 GNUNET_TIME_relative_ntoh (cnm->latency),
418 ntohl (cnm->distance));
420 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
421 if (NULL == h->disconnects)
426 if (msize != sizeof (struct DisconnectNotifyMessage))
431 dnm = (const struct DisconnectNotifyMessage *) msg;
432 h->disconnects (h->cls,
435 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
437 sizeof (struct NotifyTrafficMessage) +
438 sizeof (struct GNUNET_MessageHeader))
443 ntm = (const struct NotifyTrafficMessage *) msg;
444 em = (const struct GNUNET_MessageHeader *) &ntm[1];
446 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
447 "Received message of type %u from peer `%4s'\n",
448 ntohs (em->type), GNUNET_i2s (&ntm->peer));
450 if ((GNUNET_NO == h->inbound_hdr_only) &&
451 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
456 et = ntohs (em->type);
457 for (hpos = 0; hpos < h->hcnt; hpos++)
459 mh = &h->handlers[hpos];
462 if ((mh->expected_size != ntohs (em->size)) &&
463 (mh->expected_size != 0))
469 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
470 GNUNET_TIME_relative_ntoh (ntm->latency),
471 ntohl (ntm->distance)))
473 /* error in processing, disconnect ! */
478 if (NULL != h->inbound_notify)
479 h->inbound_notify (h->cls, &ntm->peer, em,
480 GNUNET_TIME_relative_ntoh (ntm->latency),
481 ntohl (ntm->distance));
483 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
485 sizeof (struct NotifyTrafficMessage) +
486 sizeof (struct GNUNET_MessageHeader))
491 ntm = (const struct NotifyTrafficMessage *) msg;
492 em = (const struct GNUNET_MessageHeader *) &ntm[1];
493 if ((GNUNET_NO == h->outbound_hdr_only) &&
494 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
499 if (NULL == h->outbound_notify)
504 h->outbound_notify (h->cls, &ntm->peer, em,
505 GNUNET_TIME_relative_ntoh (ntm->latency),
506 ntohl (ntm->distance));
512 GNUNET_CLIENT_receive (h->client_notifications,
513 &main_notify_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
518 * Function called when we are ready to transmit our
519 * "START" message (or when this operation timed out).
522 * @param size number of bytes available in buf
523 * @param buf where the callee should write the message
524 * @return number of bytes written to buf
526 static size_t transmit_start (void *cls, size_t size, void *buf);
530 * Function called on the first message received from
531 * the service (contains our public key, etc.).
532 * Should trigger calling the init callback
533 * and then start our regular message processing.
536 * @param msg message received, NULL on timeout or fatal error
539 init_reply_handler (void *cls, const struct GNUNET_MessageHeader *msg)
541 struct GNUNET_CORE_Handle *h = cls;
542 const struct InitReplyMessage *m;
543 GNUNET_CORE_StartupCallback init;
544 struct GNUNET_PeerIdentity my_identity;
547 (ntohs (msg->size) != sizeof (struct InitReplyMessage)) ||
548 (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY))
550 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
552 ("Error connecting to core service (failed to receive `%s' message, got message of type %u).\n"),
555 GNUNET_break (msg == NULL);
556 transmit_start (h, 0, NULL);
559 m = (const struct InitReplyMessage *) msg;
560 /* start our message processing loop */
562 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
563 "Successfully connected to core service, starting processing loop.\n");
565 h->currently_down = GNUNET_NO;
566 trigger_next_request (h);
567 GNUNET_CLIENT_receive (h->client_notifications,
568 &main_notify_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
569 if (NULL != (init = h->init))
571 /* mark so we don't call init on reconnect */
573 GNUNET_CRYPTO_hash (&m->publicKey,
575 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
576 &my_identity.hashPubKey);
577 init (h->cls, h, &my_identity, &m->publicKey);
583 reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
585 struct GNUNET_CORE_Handle *h = cls;
586 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
592 * Function called when we are ready to transmit our
593 * "START" message (or when this operation timed out).
596 * @param size number of bytes available in buf
597 * @param buf where the callee should write the message
598 * @return number of bytes written to buf
601 transmit_start (void *cls, size_t size, void *buf)
603 struct GNUNET_CORE_Handle *h = cls;
604 struct InitMessage *init;
609 struct GNUNET_TIME_Relative delay;
614 if ((h->init == NULL) ||
615 (GNUNET_TIME_absolute_get ().value < h->startup_timeout.value))
617 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
618 _("Failed to connect to core service, retrying.\n"));
619 delay = GNUNET_TIME_absolute_get_remaining (h->startup_timeout);
620 if ((h->init == NULL) || (delay.value > 1000))
621 delay = GNUNET_TIME_UNIT_SECONDS;
624 GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_MINUTES);
626 GNUNET_SCHEDULER_add_delayed (h->sched,
627 delay, &reconnect_task, h);
630 /* timeout on initial connect */
631 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
632 _("Failed to connect to core service, giving up.\n"));
633 h->init (h->cls, NULL, NULL, NULL);
634 GNUNET_CORE_disconnect (h);
637 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
638 GNUNET_assert (size >= msize);
640 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
641 init->header.size = htons (msize);
642 opt = GNUNET_CORE_OPTION_NOTHING;
643 if (h->connects != NULL)
644 opt |= GNUNET_CORE_OPTION_SEND_CONNECT;
645 if (h->disconnects != NULL)
646 opt |= GNUNET_CORE_OPTION_SEND_DISCONNECT;
647 if (h->inbound_notify != NULL)
649 if (h->inbound_hdr_only)
650 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
652 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
654 if (h->outbound_notify != NULL)
656 if (h->outbound_hdr_only)
657 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
659 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
661 init->options = htonl (opt);
662 ts = (uint16_t *) & init[1];
663 for (hpos = 0; hpos < h->hcnt; hpos++)
664 ts[hpos] = htons (h->handlers[hpos].type);
665 GNUNET_CLIENT_receive (h->client_notifications,
668 GNUNET_TIME_absolute_get_remaining
669 (h->startup_timeout));
670 return sizeof (struct InitMessage) + h->hcnt * sizeof (uint16_t);
675 * Connect to the core service. Note that the connection may
676 * complete (or fail) asynchronously.
678 * @param sched scheduler to use
679 * @param cfg configuration to use
680 * @param timeout after how long should we give up trying to connect to the core service?
681 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
682 * @param init callback to call on timeout or once we have successfully
683 * connected to the core service; note that timeout is only meaningful if init is not NULL
684 * @param connects function to call on peer connect, can be NULL
685 * @param disconnects function to call on peer disconnect / timeout, can be NULL
686 * @param inbound_notify function to call for all inbound messages, can be NULL
687 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
688 * GNUNET_MessageHeader and hence we do not need to give it the full message;
689 * can be used to improve efficiency, ignored if inbound_notify is NULLL
690 * @param outbound_notify function to call for all outbound messages, can be NULL
691 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
692 * GNUNET_MessageHeader and hence we do not need to give it the full message
693 * can be used to improve efficiency, ignored if outbound_notify is NULLL
694 * @param handlers callbacks for messages we care about, NULL-terminated
695 * @return handle to the core service (only useful for disconnect until 'init' is called);
696 * NULL on error (in this case, init is never called)
698 struct GNUNET_CORE_Handle *
699 GNUNET_CORE_connect (struct GNUNET_SCHEDULER_Handle *sched,
700 const struct GNUNET_CONFIGURATION_Handle *cfg,
701 struct GNUNET_TIME_Relative timeout,
703 GNUNET_CORE_StartupCallback init,
704 GNUNET_CORE_ConnectEventHandler connects,
705 GNUNET_CORE_DisconnectEventHandler disconnects,
706 GNUNET_CORE_MessageCallback inbound_notify,
707 int inbound_hdr_only,
708 GNUNET_CORE_MessageCallback outbound_notify,
709 int outbound_hdr_only,
710 const struct GNUNET_CORE_MessageHandler *handlers)
712 struct GNUNET_CORE_Handle *h;
714 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
719 h->connects = connects;
720 h->disconnects = disconnects;
721 h->inbound_notify = inbound_notify;
722 h->outbound_notify = outbound_notify;
723 h->inbound_hdr_only = inbound_hdr_only;
724 h->outbound_hdr_only = outbound_hdr_only;
725 h->handlers = handlers;
726 h->client_notifications = GNUNET_CLIENT_connect (sched, "core", cfg);
727 if (h->client_notifications == NULL)
732 h->startup_timeout = GNUNET_TIME_relative_to_absolute (timeout);
734 while (handlers[h->hcnt].callback != NULL)
736 GNUNET_assert (h->hcnt <
737 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
738 sizeof (struct InitMessage)) / sizeof (uint16_t));
740 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
741 "Trying to connect to core service in next %llu ms.\n",
745 GNUNET_CLIENT_notify_transmit_ready (h->client_notifications,
746 sizeof (struct InitMessage) +
747 sizeof (uint16_t) * h->hcnt, timeout,
755 * Disconnect from the core service.
757 * @param handle connection to core to disconnect
760 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
762 if (handle->th != NULL)
763 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
764 if (handle->solicit_transmit_req != NULL)
765 GNUNET_CORE_notify_transmit_ready_cancel (handle->solicit_transmit_req);
766 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
767 GNUNET_SCHEDULER_cancel (handle->sched, handle->reconnect_task);
768 if (handle->client_notifications != NULL)
769 GNUNET_CLIENT_disconnect (handle->client_notifications, GNUNET_NO);
770 GNUNET_free_non_null (handle->solicit_buffer);
771 GNUNET_free (handle);
776 * Build the message requesting data transmission.
779 produce_send (void *cls, size_t size, void *buf)
781 struct GNUNET_CORE_TransmitHandle *th = cls;
782 struct GNUNET_CORE_Handle *h;
783 struct SendMessage *sm;
785 GNUNET_CONNECTION_TransmitReadyNotify notify;
791 /* timeout or error */
793 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
794 "P2P transmission request for `%4s' timed out.\n",
795 GNUNET_i2s(&th->peer));
797 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
798 GNUNET_CORE_notify_transmit_ready_cancel (th);
799 trigger_next_request (h);
803 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
804 "Preparing for P2P transmission to `%4s'.\n",
805 GNUNET_i2s(&th->peer));
807 GNUNET_assert (th->timeout_task != GNUNET_SCHEDULER_NO_TASK);
808 sm = (struct SendMessage *) buf;
809 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
810 sm->priority = htonl (th->priority);
811 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
814 notify_cls = th->notify_cls;
815 GNUNET_CORE_notify_transmit_ready_cancel (th);
816 trigger_next_request (h);
817 GNUNET_assert (size >= sizeof (struct SendMessage));
818 dt = notify (notify_cls, size - sizeof (struct SendMessage), &sm[1]);
822 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
823 "Size of clients message to peer %s is 0!\n",
824 GNUNET_i2s(&th->peer));
826 /* client decided to send nothing! */
829 GNUNET_assert (dt >= sizeof (struct GNUNET_MessageHeader));
830 if (dt + sizeof (struct SendMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
835 sm->header.size = htons (dt + sizeof (struct SendMessage));
836 GNUNET_assert (dt + sizeof (struct SendMessage) <= size);
837 return dt + sizeof (struct SendMessage);
842 * Ask the core to call "notify" once it is ready to transmit the
843 * given number of bytes to the specified "target". If we are not yet
844 * connected to the specified peer, a call to this function will cause
845 * us to try to establish a connection.
847 * @param handle connection to core service
848 * @param priority how important is the message?
849 * @param maxdelay how long can the message wait?
850 * @param target who should receive the message,
851 * use NULL for this peer (loopback)
852 * @param notify_size how many bytes of buffer space does notify want?
853 * @param notify function to call when buffer space is available
854 * @param notify_cls closure for notify
855 * @return non-NULL if the notify callback was queued,
856 * NULL if we can not even queue the request (insufficient
857 * memory); if NULL is returned, "notify" will NOT be called.
859 struct GNUNET_CORE_TransmitHandle *
860 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
861 unsigned int priority,
862 struct GNUNET_TIME_Relative maxdelay,
863 const struct GNUNET_PeerIdentity *target,
865 GNUNET_CONNECTION_TransmitReadyNotify notify,
868 struct GNUNET_CORE_TransmitHandle *th;
870 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
871 GNUNET_SERVER_MAX_MESSAGE_SIZE);
872 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
875 th->prev = handle->pending_tail;
876 if (handle->pending_tail == NULL)
877 handle->pending_head = th;
879 handle->pending_tail->next = th;
880 th->get_message = &produce_send;
881 th->get_message_cls = th;
883 th->notify_cls = notify_cls;
885 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
886 th->timeout_task = GNUNET_SCHEDULER_add_delayed (handle->sched,
888 &timeout_request, th);
889 th->priority = priority;
890 th->msize = sizeof (struct SendMessage) + notify_size;
891 /* was the request queue previously empty? */
892 if ( (handle->pending_head == th) &&
893 (handle->th == NULL) )
894 trigger_next_request (handle);
900 * Cancel the specified transmission-ready notification.
902 * @param h handle that was returned by "notify_transmit_ready".
905 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
908 struct GNUNET_CORE_Handle *handle = h->ch;
910 if (handle->submitted == h)
912 handle->submitted = NULL;
917 handle->pending_head = h->next;
919 h->prev->next = h->next;
921 handle->pending_tail = h->prev;
923 h->next->prev = h->prev;
925 if (h->timeout_task != GNUNET_SCHEDULER_NO_TASK)
926 GNUNET_SCHEDULER_cancel (handle->sched, h->timeout_task);
931 /* end of core_api.c */