2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
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
60 * (pre-connects, no session key exchange yet).
62 GNUNET_CORE_ConnectEventHandler pre_connects;
65 * Function to call whenever we're notified about a peer connecting.
67 GNUNET_CORE_ConnectEventHandler connects;
70 * Function to call whenever we're notified about a peer disconnecting.
72 GNUNET_CORE_DisconnectEventHandler disconnects;
75 * Function to call whenever we receive an inbound message.
77 GNUNET_CORE_MessageCallback inbound_notify;
80 * Function to call whenever we receive an outbound message.
82 GNUNET_CORE_MessageCallback outbound_notify;
85 * Function handlers for messages of particular type.
87 const struct GNUNET_CORE_MessageHandler *handlers;
90 * Our connection to the service for notifications.
92 struct GNUNET_CLIENT_Connection *client_notifications;
95 * Handle for our current transmission request.
97 struct GNUNET_CLIENT_TransmitHandle *th;
100 * Head of doubly-linked list of pending requests.
102 struct GNUNET_CORE_TransmitHandle *pending_head;
105 * Tail of doubly-linked list of pending requests.
107 struct GNUNET_CORE_TransmitHandle *pending_tail;
110 * Currently submitted request (or NULL)
112 struct GNUNET_CORE_TransmitHandle *submitted;
115 * Currently submitted request based on solicitation (or NULL)
117 struct GNUNET_CORE_TransmitHandle *solicit_transmit_req;
120 * Buffer where we store a message for transmission in response
121 * to a traffic solicitation (or NULL).
123 char *solicit_buffer;
126 * How long to wait until we time out the connection attempt?
128 struct GNUNET_TIME_Absolute startup_timeout;
131 * ID of reconnect task (if any).
133 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
136 * Number of entries in the handlers array.
141 * For inbound notifications without a specific handler, do
142 * we expect to only receive headers?
144 int inbound_hdr_only;
147 * For outbound notifications without a specific handler, do
148 * we expect to only receive headers?
150 int outbound_hdr_only;
153 * Are we currently disconnected and hence unable to forward
161 * Handle for a transmission request.
163 struct GNUNET_CORE_TransmitHandle
167 * We keep active transmit handles in a doubly-linked list.
169 struct GNUNET_CORE_TransmitHandle *next;
172 * We keep active transmit handles in a doubly-linked list.
174 struct GNUNET_CORE_TransmitHandle *prev;
177 * Corresponding core handle.
179 struct GNUNET_CORE_Handle *ch;
182 * Function that will be called to get the actual request
183 * (once we are ready to transmit this request to the core).
184 * The function will be called with a NULL buffer to signal
187 GNUNET_CONNECTION_TransmitReadyNotify get_message;
190 * Closure for get_message.
192 void *get_message_cls;
195 * If this entry is for a transmission request, pointer
196 * to the notify callback; otherwise NULL.
198 GNUNET_CONNECTION_TransmitReadyNotify notify;
201 * Closure for notify.
206 * Peer the request is about.
208 struct GNUNET_PeerIdentity peer;
211 * Timeout for this handle.
213 struct GNUNET_TIME_Absolute timeout;
216 * ID of timeout task.
218 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
221 * How important is this message?
226 * Size of this request.
235 * Function called when we are ready to transmit our
236 * "START" message (or when this operation timed out).
239 * @param size number of bytes available in buf
240 * @param buf where the callee should write the message
241 * @return number of bytes written to buf
243 static size_t transmit_start (void *cls, size_t size, void *buf);
247 * Our current client connection went down. Clean it up
248 * and try to reconnect!
250 * @param h our handle to the core service
253 reconnect (struct GNUNET_CORE_Handle *h)
255 GNUNET_CLIENT_disconnect (h->client_notifications);
256 h->currently_down = GNUNET_YES;
257 h->client_notifications = GNUNET_CLIENT_connect (h->sched, "core", h->cfg);
258 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client_notifications,
259 sizeof (struct InitMessage) +
260 sizeof (uint16_t) * h->hcnt,
261 GNUNET_TIME_UNIT_SECONDS,
268 * The given request hit its timeout. Remove from the
269 * doubly-linked list and call the respective continuation.
271 * @param cls the transmit handle of the request that timed out
272 * @param tc context, can be NULL (!)
275 timeout_request (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
277 struct GNUNET_CORE_TransmitHandle *th = cls;
279 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
280 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
285 * Function called when we are ready to transmit a request from our
286 * request list (or when this operation timed out).
289 * @param size number of bytes available in buf
290 * @param buf where the callee should write the message
291 * @return number of bytes written to buf
294 request_start (void *cls, size_t size, void *buf)
296 struct GNUNET_CORE_Handle *h = cls;
297 struct GNUNET_CORE_TransmitHandle *th;
301 th = h->pending_head;
304 timeout_request (th, NULL);
307 /* create new timeout task (in case core takes too long to respond!) */
308 th->timeout_task = GNUNET_SCHEDULER_add_delayed (h->sched,
309 GNUNET_TIME_absolute_get_remaining
311 &timeout_request, th);
312 /* remove th from doubly-linked pending list, move to submitted */
313 GNUNET_assert (th->prev == NULL);
314 h->pending_head = th->next;
315 if (th->next == NULL)
316 h->pending_tail = NULL;
318 th->next->prev = NULL;
319 GNUNET_assert (h->submitted == NULL);
321 GNUNET_assert (size >= th->msize);
322 ret = th->get_message (th->get_message_cls, size, buf);
323 GNUNET_assert (ret <= size);
329 * Check the list of pending requests, send the next
333 trigger_next_request (struct GNUNET_CORE_Handle *h)
335 struct GNUNET_CORE_TransmitHandle *th;
337 if (h->currently_down)
339 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
340 "\nIn trigger_next_request, connection currently down...\n");
341 return; /* connection temporarily down */
343 if (NULL == (th = h->pending_head))
344 return; /* no requests pending */
345 GNUNET_assert (NULL == h->th);
346 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
348 GNUNET_SCHEDULER_cancel (h->sched, th->timeout_task);
349 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
351 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client_notifications,
353 GNUNET_TIME_absolute_get_remaining
362 * Handler for notification messages received from the core.
364 * @param cls our "struct GNUNET_CORE_Handle"
365 * @param msg the message received from the core service
368 main_notify_handler (void *cls, const struct GNUNET_MessageHeader *msg)
370 struct GNUNET_CORE_Handle *h = cls;
372 const struct ConnectNotifyMessage *cnm;
373 const struct DisconnectNotifyMessage *dnm;
374 const struct NotifyTrafficMessage *ntm;
375 const struct GNUNET_MessageHeader *em;
378 const struct GNUNET_CORE_MessageHandler *mh;
382 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
384 ("Client was disconnected from core service, trying to reconnect.\n"));
388 msize = ntohs (msg->size);
390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
391 "Processing message of type %u and size %u from core service\n",
392 ntohs (msg->type), msize);
394 switch (ntohs (msg->type))
396 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_PRE_CONNECT:
397 if (NULL == h->pre_connects)
402 if (msize != sizeof (struct ConnectNotifyMessage))
407 cnm = (const struct ConnectNotifyMessage *) msg;
408 h->pre_connects (h->cls,
410 GNUNET_TIME_relative_ntoh (cnm->latency),
411 ntohl (cnm->distance));
413 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
414 if (NULL == h->connects)
419 if (msize != sizeof (struct ConnectNotifyMessage))
424 cnm = (const struct ConnectNotifyMessage *) msg;
427 GNUNET_TIME_relative_ntoh (cnm->latency),
428 ntohl (cnm->distance));
430 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
431 if (NULL == h->disconnects)
436 if (msize != sizeof (struct DisconnectNotifyMessage))
441 dnm = (const struct DisconnectNotifyMessage *) msg;
442 h->disconnects (h->cls,
445 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
447 sizeof (struct NotifyTrafficMessage) +
448 sizeof (struct GNUNET_MessageHeader))
453 ntm = (const struct NotifyTrafficMessage *) msg;
454 em = (const struct GNUNET_MessageHeader *) &ntm[1];
456 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
457 "Received message of type %u from peer `%4s'\n",
458 ntohs (em->type), GNUNET_i2s (&ntm->peer));
460 if ((GNUNET_NO == h->inbound_hdr_only) &&
461 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
466 et = ntohs (em->type);
467 for (hpos = 0; hpos < h->hcnt; hpos++)
469 mh = &h->handlers[hpos];
472 if ((mh->expected_size != ntohs (em->size)) &&
473 (mh->expected_size != 0))
479 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
480 GNUNET_TIME_relative_ntoh (ntm->latency),
481 ntohl (ntm->distance)))
483 /* error in processing, disconnect ! */
488 if (NULL != h->inbound_notify)
489 h->inbound_notify (h->cls, &ntm->peer, em,
490 GNUNET_TIME_relative_ntoh (ntm->latency),
491 ntohl (ntm->distance));
493 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
495 sizeof (struct NotifyTrafficMessage) +
496 sizeof (struct GNUNET_MessageHeader))
501 ntm = (const struct NotifyTrafficMessage *) msg;
502 em = (const struct GNUNET_MessageHeader *) &ntm[1];
503 if ((GNUNET_NO == h->outbound_hdr_only) &&
504 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
509 if (NULL == h->outbound_notify)
514 h->outbound_notify (h->cls, &ntm->peer, em,
515 GNUNET_TIME_relative_ntoh (ntm->latency),
516 ntohl (ntm->distance));
522 GNUNET_CLIENT_receive (h->client_notifications,
523 &main_notify_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
528 * Function called when we are ready to transmit our
529 * "START" message (or when this operation timed out).
532 * @param size number of bytes available in buf
533 * @param buf where the callee should write the message
534 * @return number of bytes written to buf
536 static size_t transmit_start (void *cls, size_t size, void *buf);
540 * Function called on the first message received from
541 * the service (contains our public key, etc.).
542 * Should trigger calling the init callback
543 * and then start our regular message processing.
546 * @param msg message received, NULL on timeout or fatal error
549 init_reply_handler (void *cls, const struct GNUNET_MessageHeader *msg)
551 struct GNUNET_CORE_Handle *h = cls;
552 const struct InitReplyMessage *m;
553 GNUNET_CORE_StartupCallback init;
554 struct GNUNET_PeerIdentity my_identity;
557 (ntohs (msg->size) != sizeof (struct InitReplyMessage)) ||
558 (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY))
560 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
562 ("Error connecting to core service (failed to receive `%s' message).\n"),
564 GNUNET_break (msg == NULL);
565 transmit_start (h, 0, NULL);
568 m = (const struct InitReplyMessage *) msg;
569 /* start our message processing loop */
571 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
573 ("Successfully connected to core service, starting processing loop.\n"));
575 h->currently_down = GNUNET_NO;
576 trigger_next_request (h);
577 GNUNET_CLIENT_receive (h->client_notifications,
578 &main_notify_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
579 if (NULL != (init = h->init))
581 /* mark so we don't call init on reconnect */
584 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
585 _("Successfully connected to core service.\n"));
587 GNUNET_CRYPTO_hash (&m->publicKey,
589 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
590 &my_identity.hashPubKey);
591 init (h->cls, h, &my_identity, &m->publicKey);
597 reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
599 struct GNUNET_CORE_Handle *h = cls;
600 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
606 * Function called when we are ready to transmit our
607 * "START" message (or when this operation timed out).
610 * @param size number of bytes available in buf
611 * @param buf where the callee should write the message
612 * @return number of bytes written to buf
615 transmit_start (void *cls, size_t size, void *buf)
617 struct GNUNET_CORE_Handle *h = cls;
618 struct InitMessage *init;
623 struct GNUNET_TIME_Relative delay;
628 if ((h->init == NULL) ||
629 (GNUNET_TIME_absolute_get ().value < h->startup_timeout.value))
631 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
632 _("Failed to connect to core service, retrying.\n"));
633 delay = GNUNET_TIME_absolute_get_remaining (h->startup_timeout);
634 if ((h->init == NULL) || (delay.value > 1000))
635 delay = GNUNET_TIME_UNIT_SECONDS;
638 GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_MINUTES);
640 GNUNET_SCHEDULER_add_delayed (h->sched,
641 delay, &reconnect_task, h);
644 /* timeout on initial connect */
645 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
646 _("Failed to connect to core service, giving up.\n"));
647 h->init (h->cls, NULL, NULL, NULL);
648 GNUNET_CORE_disconnect (h);
651 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
652 GNUNET_assert (size >= msize);
654 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
655 init->header.size = htons (msize);
656 opt = GNUNET_CORE_OPTION_NOTHING;
657 if (h->pre_connects != NULL)
658 opt |= GNUNET_CORE_OPTION_SEND_PRE_CONNECT;
659 if (h->connects != NULL)
660 opt |= GNUNET_CORE_OPTION_SEND_CONNECT;
661 if (h->disconnects != NULL)
662 opt |= GNUNET_CORE_OPTION_SEND_DISCONNECT;
663 if (h->inbound_notify != NULL)
665 if (h->inbound_hdr_only)
666 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
668 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
670 if (h->outbound_notify != NULL)
672 if (h->outbound_hdr_only)
673 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
675 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
677 init->options = htonl (opt);
678 ts = (uint16_t *) & init[1];
679 for (hpos = 0; hpos < h->hcnt; hpos++)
680 ts[hpos] = htons (h->handlers[hpos].type);
681 GNUNET_CLIENT_receive (h->client_notifications,
684 GNUNET_TIME_absolute_get_remaining
685 (h->startup_timeout));
686 return sizeof (struct InitMessage) + h->hcnt * sizeof (uint16_t);
691 * Connect to the core service. Note that the connection may
692 * complete (or fail) asynchronously.
694 * @param sched scheduler to use
695 * @param cfg configuration to use
696 * @param timeout after how long should we give up trying to connect to the core service?
697 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
698 * @param init callback to call on timeout or once we have successfully
699 * connected to the core service; note that timeout is only meaningful if init is not NULL
700 * @param pre_connects function to call on peer pre-connect (no session key yet), can be NULL
701 * @param connects function to call on peer connect, can be NULL
702 * @param disconnects function to call on peer disconnect / timeout, can be NULL
703 * @param inbound_notify function to call for all inbound messages, can be NULL
704 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
705 * GNUNET_MessageHeader and hence we do not need to give it the full message;
706 * can be used to improve efficiency, ignored if inbound_notify is NULLL
707 * @param outbound_notify function to call for all outbound messages, can be NULL
708 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
709 * GNUNET_MessageHeader and hence we do not need to give it the full message
710 * can be used to improve efficiency, ignored if outbound_notify is NULLL
711 * @param handlers callbacks for messages we care about, NULL-terminated
712 * @return handle to the core service (only useful for disconnect until 'init' is called);
713 * NULL on error (in this case, init is never called)
715 struct GNUNET_CORE_Handle *
716 GNUNET_CORE_connect (struct GNUNET_SCHEDULER_Handle *sched,
717 const struct GNUNET_CONFIGURATION_Handle *cfg,
718 struct GNUNET_TIME_Relative timeout,
720 GNUNET_CORE_StartupCallback init,
721 GNUNET_CORE_ConnectEventHandler pre_connects,
722 GNUNET_CORE_ConnectEventHandler connects,
723 GNUNET_CORE_DisconnectEventHandler disconnects,
724 GNUNET_CORE_MessageCallback inbound_notify,
725 int inbound_hdr_only,
726 GNUNET_CORE_MessageCallback outbound_notify,
727 int outbound_hdr_only,
728 const struct GNUNET_CORE_MessageHandler *handlers)
730 struct GNUNET_CORE_Handle *h;
732 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
737 h->pre_connects = pre_connects;
738 h->connects = connects;
739 h->disconnects = disconnects;
740 h->inbound_notify = inbound_notify;
741 h->outbound_notify = outbound_notify;
742 h->inbound_hdr_only = inbound_hdr_only;
743 h->outbound_hdr_only = outbound_hdr_only;
744 h->handlers = handlers;
745 h->client_notifications = GNUNET_CLIENT_connect (sched, "core", cfg);
746 if (h->client_notifications == NULL)
751 h->startup_timeout = GNUNET_TIME_relative_to_absolute (timeout);
753 while (handlers[h->hcnt].callback != NULL)
755 GNUNET_assert (h->hcnt <
756 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
757 sizeof (struct InitMessage)) / sizeof (uint16_t));
759 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
760 "Trying to connect to core service in next %llu ms.\n",
764 GNUNET_CLIENT_notify_transmit_ready (h->client_notifications,
765 sizeof (struct InitMessage) +
766 sizeof (uint16_t) * h->hcnt, timeout,
774 * Disconnect from the core service.
776 * @param handle connection to core to disconnect
779 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
781 if (handle->th != NULL)
782 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
783 if (handle->solicit_transmit_req != NULL)
784 GNUNET_CORE_notify_transmit_ready_cancel (handle->solicit_transmit_req);
785 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
786 GNUNET_SCHEDULER_cancel (handle->sched, handle->reconnect_task);
787 GNUNET_CLIENT_disconnect (handle->client_notifications);
788 GNUNET_free_non_null (handle->solicit_buffer);
789 GNUNET_free (handle);
794 * Build the message requesting data transmission.
797 produce_send (void *cls, size_t size, void *buf)
799 struct GNUNET_CORE_TransmitHandle *th = cls;
800 struct GNUNET_CORE_Handle *h;
801 struct SendMessage *sm;
803 GNUNET_CONNECTION_TransmitReadyNotify notify;
809 /* timeout or error */
811 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
812 "P2P transmission request for `%4s' timed out.\n",
813 GNUNET_i2s(&th->peer));
815 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
816 GNUNET_CORE_notify_transmit_ready_cancel (th);
817 trigger_next_request (h);
821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
822 "Preparing for P2P transmission to `%4s'.\n",
823 GNUNET_i2s(&th->peer));
825 GNUNET_assert (th->timeout_task != GNUNET_SCHEDULER_NO_TASK);
826 sm = (struct SendMessage *) buf;
827 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
828 sm->priority = htonl (th->priority);
829 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
832 notify_cls = th->notify_cls;
833 GNUNET_CORE_notify_transmit_ready_cancel (th);
834 trigger_next_request (h);
835 GNUNET_assert (size >= sizeof (struct SendMessage));
836 dt = notify (notify_cls, size - sizeof (struct SendMessage), &sm[1]);
840 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
841 "Size of clients message to peer %s is 0!\n",
842 GNUNET_i2s(&th->peer));
844 /* client decided to send nothing! */
847 GNUNET_assert (dt >= sizeof (struct GNUNET_MessageHeader));
848 sm->header.size = htons (dt + sizeof (struct SendMessage));
849 GNUNET_assert (dt + sizeof (struct SendMessage) <= size);
850 return dt + sizeof (struct SendMessage);
855 * Ask the core to call "notify" once it is ready to transmit the
856 * given number of bytes to the specified "target". If we are not yet
857 * connected to the specified peer, a call to this function will cause
858 * us to try to establish a connection.
860 * @param handle connection to core service
861 * @param priority how important is the message?
862 * @param maxdelay how long can the message wait?
863 * @param target who should receive the message,
864 * use NULL for this peer (loopback)
865 * @param notify_size how many bytes of buffer space does notify want?
866 * @param notify function to call when buffer space is available
867 * @param notify_cls closure for notify
868 * @return non-NULL if the notify callback was queued,
869 * NULL if we can not even queue the request (insufficient
870 * memory); if NULL is returned, "notify" will NOT be called.
872 struct GNUNET_CORE_TransmitHandle *
873 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
874 unsigned int priority,
875 struct GNUNET_TIME_Relative maxdelay,
876 const struct GNUNET_PeerIdentity *target,
878 GNUNET_CONNECTION_TransmitReadyNotify notify,
881 struct GNUNET_CORE_TransmitHandle *th;
883 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
884 GNUNET_SERVER_MAX_MESSAGE_SIZE);
885 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
888 th->prev = handle->pending_tail;
889 if (handle->pending_tail == NULL)
890 handle->pending_head = th;
892 handle->pending_tail->next = th;
893 th->get_message = &produce_send;
894 th->get_message_cls = th;
896 th->notify_cls = notify_cls;
898 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
899 th->timeout_task = GNUNET_SCHEDULER_add_delayed (handle->sched,
901 &timeout_request, th);
902 th->priority = priority;
903 th->msize = sizeof (struct SendMessage) + notify_size;
904 /* was the request queue previously empty? */
905 if ( (handle->pending_head == th) &&
906 (handle->th == NULL) )
907 trigger_next_request (handle);
913 * Cancel the specified transmission-ready notification.
915 * @param h handle that was returned by "notify_transmit_ready".
918 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
921 struct GNUNET_CORE_Handle *handle = h->ch;
923 if (handle->submitted == h)
925 handle->submitted = NULL;
930 handle->pending_head = h->next;
932 h->prev->next = h->next;
934 handle->pending_tail = h->prev;
936 h->next->prev = h->prev;
938 if (h->timeout_task != GNUNET_SCHEDULER_NO_TASK)
939 GNUNET_SCHEDULER_cancel (handle->sched, h->timeout_task);
944 /* end of core_api.c */