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 * Our connection to the service for normal requests.
97 struct GNUNET_CLIENT_Connection *client_requests;
100 * Handle for our current transmission request.
102 struct GNUNET_CLIENT_TransmitHandle *th;
105 * Head of doubly-linked list of pending requests.
107 struct GNUNET_CORE_TransmitHandle *pending_head;
110 * Tail of doubly-linked list of pending requests.
112 struct GNUNET_CORE_TransmitHandle *pending_tail;
115 * Currently submitted request (or NULL)
117 struct GNUNET_CORE_TransmitHandle *submitted;
120 * Currently submitted request based on solicitation (or NULL)
122 struct GNUNET_CORE_TransmitHandle *solicit_transmit_req;
125 * Buffer where we store a message for transmission in response
126 * to a traffic solicitation (or NULL).
128 char *solicit_buffer;
131 * How long to wait until we time out the connection attempt?
133 struct GNUNET_TIME_Absolute startup_timeout;
136 * ID of reconnect task (if any).
138 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
141 * Number of entries in the handlers array.
146 * For inbound notifications without a specific handler, do
147 * we expect to only receive headers?
149 int inbound_hdr_only;
152 * For outbound notifications without a specific handler, do
153 * we expect to only receive headers?
155 int outbound_hdr_only;
158 * Are we currently disconnected and hence unable to forward
166 * Handle for a transmission request.
168 struct GNUNET_CORE_TransmitHandle
172 * We keep active transmit handles in a doubly-linked list.
174 struct GNUNET_CORE_TransmitHandle *next;
177 * We keep active transmit handles in a doubly-linked list.
179 struct GNUNET_CORE_TransmitHandle *prev;
182 * Corresponding core handle.
184 struct GNUNET_CORE_Handle *ch;
187 * Function that will be called to get the actual request
188 * (once we are ready to transmit this request to the core).
189 * The function will be called with a NULL buffer to signal
192 GNUNET_CONNECTION_TransmitReadyNotify get_message;
195 * Closure for get_message.
197 void *get_message_cls;
200 * If this entry is for a configuration request, pointer
201 * to the information callback; otherwise NULL.
203 GNUNET_CORE_PeerConfigurationInfoCallback info;
211 * If this entry is for a transmission request, pointer
212 * to the notify callback; otherwise NULL.
214 GNUNET_CONNECTION_TransmitReadyNotify notify;
217 * Closure for notify.
222 * Peer the request is about.
224 struct GNUNET_PeerIdentity peer;
227 * Timeout for this handle.
229 struct GNUNET_TIME_Absolute timeout;
232 * ID of timeout task.
234 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
237 * How important is this message?
242 * Size of this request.
251 * Function called when we are ready to transmit our
252 * "START" message (or when this operation timed out).
255 * @param size number of bytes available in buf
256 * @param buf where the callee should write the message
257 * @return number of bytes written to buf
259 static size_t transmit_start (void *cls, size_t size, void *buf);
263 * Our current client connection went down. Clean it up
264 * and try to reconnect!
266 * @param h our handle to the core service
269 reconnect (struct GNUNET_CORE_Handle *h)
271 GNUNET_CLIENT_disconnect (h->client_notifications);
272 h->currently_down = GNUNET_YES;
273 h->client_notifications = GNUNET_CLIENT_connect (h->sched, "core", h->cfg);
274 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client_notifications,
275 sizeof (struct InitMessage) +
276 sizeof (uint16_t) * h->hcnt,
277 GNUNET_TIME_UNIT_SECONDS,
284 * The given request hit its timeout. Remove from the
285 * doubly-linked list and call the respective continuation.
287 * @param cls the transmit handle of the request that timed out
288 * @param tc context, can be NULL (!)
291 timeout_request (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
293 struct GNUNET_CORE_TransmitHandle *th = cls;
295 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
296 "Transmission request timed out.\n");
297 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
298 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
303 * Function called when we are ready to transmit a request from our
304 * request list (or when this operation timed out).
307 * @param size number of bytes available in buf
308 * @param buf where the callee should write the message
309 * @return number of bytes written to buf
312 request_start (void *cls, size_t size, void *buf)
314 struct GNUNET_CORE_Handle *h = cls;
315 struct GNUNET_CORE_TransmitHandle *th;
319 th = h->pending_head;
322 timeout_request (th, NULL);
325 /* create new timeout task (in case core takes too long to respond!) */
326 th->timeout_task = GNUNET_SCHEDULER_add_delayed (h->sched,
327 GNUNET_TIME_absolute_get_remaining
329 &timeout_request, th);
330 /* remove th from doubly-linked pending list, move to submitted */
331 GNUNET_assert (th->prev == NULL);
332 h->pending_head = th->next;
333 if (th->next == NULL)
334 h->pending_tail = NULL;
336 th->next->prev = NULL;
337 GNUNET_assert (h->submitted == NULL);
339 GNUNET_assert (size >= th->msize);
340 ret = th->get_message (th->get_message_cls, size, buf);
341 GNUNET_assert (ret <= size);
347 * Check the list of pending requests, send the next
351 trigger_next_request (struct GNUNET_CORE_Handle *h)
353 struct GNUNET_CORE_TransmitHandle *th;
355 if (h->currently_down)
356 return; /* connection temporarily down */
357 if (NULL == (th = h->pending_head))
358 return; /* no requests pending */
359 GNUNET_assert (NULL == h->th);
360 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
362 GNUNET_SCHEDULER_cancel (h->sched, th->timeout_task);
363 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
365 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client_requests,
367 GNUNET_TIME_absolute_get_remaining
376 * Handler for notification messages received from the core.
378 * @param cls our "struct GNUNET_CORE_Handle"
379 * @param msg the message received from the core service
382 main_notify_handler (void *cls, const struct GNUNET_MessageHeader *msg)
384 struct GNUNET_CORE_Handle *h = cls;
386 const struct ConnectNotifyMessage *cnm;
387 const struct DisconnectNotifyMessage *dnm;
388 const struct NotifyTrafficMessage *ntm;
389 const struct GNUNET_MessageHeader *em;
392 const struct GNUNET_CORE_MessageHandler *mh;
396 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
398 ("Client was disconnected from core service, trying to reconnect.\n"));
402 msize = ntohs (msg->size);
404 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
405 "Processing message of type %u and size %u from core service\n",
406 ntohs (msg->type), msize);
408 switch (ntohs (msg->type))
410 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_PRE_CONNECT:
411 if (NULL == h->pre_connects)
416 if (msize != sizeof (struct ConnectNotifyMessage))
421 cnm = (const struct ConnectNotifyMessage *) msg;
422 h->pre_connects (h->cls,
424 GNUNET_TIME_relative_ntoh (cnm->latency),
425 ntohl (cnm->distance));
427 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
428 if (NULL == h->connects)
433 if (msize != sizeof (struct ConnectNotifyMessage))
438 cnm = (const struct ConnectNotifyMessage *) msg;
441 GNUNET_TIME_relative_ntoh (cnm->latency),
442 ntohl (cnm->distance));
444 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
445 if (NULL == h->disconnects)
450 if (msize != sizeof (struct DisconnectNotifyMessage))
455 dnm = (const struct DisconnectNotifyMessage *) msg;
456 h->disconnects (h->cls,
459 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
461 sizeof (struct NotifyTrafficMessage) +
462 sizeof (struct GNUNET_MessageHeader))
467 ntm = (const struct NotifyTrafficMessage *) msg;
468 em = (const struct GNUNET_MessageHeader *) &ntm[1];
470 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
471 "Received message of type %u from peer `%4s'\n",
472 ntohs (em->type), GNUNET_i2s (&ntm->peer));
474 if ((GNUNET_NO == h->inbound_hdr_only) &&
475 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
480 et = ntohs (em->type);
481 for (hpos = 0; hpos < h->hcnt; hpos++)
483 mh = &h->handlers[hpos];
486 if ((mh->expected_size != ntohs (em->size)) &&
487 (mh->expected_size != 0))
493 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
494 GNUNET_TIME_relative_ntoh (ntm->latency),
495 ntohl (ntm->distance)))
497 /* error in processing, disconnect ! */
502 if (NULL != h->inbound_notify)
503 h->inbound_notify (h->cls, &ntm->peer, em,
504 GNUNET_TIME_relative_ntoh (ntm->latency),
505 ntohl (ntm->distance));
507 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
509 sizeof (struct NotifyTrafficMessage) +
510 sizeof (struct GNUNET_MessageHeader))
515 ntm = (const struct NotifyTrafficMessage *) msg;
516 em = (const struct GNUNET_MessageHeader *) &ntm[1];
517 if ((GNUNET_NO == h->outbound_hdr_only) &&
518 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
523 if (NULL == h->outbound_notify)
528 h->outbound_notify (h->cls, &ntm->peer, em,
529 GNUNET_TIME_relative_ntoh (ntm->latency),
530 ntohl (ntm->distance));
536 GNUNET_CLIENT_receive (h->client_notifications,
537 &main_notify_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
542 * Function called when we are ready to transmit our
543 * "START" message (or when this operation timed out).
546 * @param size number of bytes available in buf
547 * @param buf where the callee should write the message
548 * @return number of bytes written to buf
550 static size_t transmit_start (void *cls, size_t size, void *buf);
554 * Function called on the first message received from
555 * the service (contains our public key, etc.).
556 * Should trigger calling the init callback
557 * and then start our regular message processing.
560 * @param msg message received, NULL on timeout or fatal error
563 init_reply_handler (void *cls, const struct GNUNET_MessageHeader *msg)
565 struct GNUNET_CORE_Handle *h = cls;
566 const struct InitReplyMessage *m;
567 GNUNET_CORE_StartupCallback init;
568 struct GNUNET_PeerIdentity my_identity;
571 (ntohs (msg->size) != sizeof (struct InitReplyMessage)) ||
572 (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY))
574 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
576 ("Error connecting to core service (failed to receive `%s' message).\n"),
578 GNUNET_break (msg == NULL);
579 transmit_start (h, 0, NULL);
582 m = (const struct InitReplyMessage *) msg;
583 /* start our message processing loop */
585 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
587 ("Successfully connected to core service, starting processing loop.\n"));
589 h->currently_down = GNUNET_NO;
590 trigger_next_request (h);
591 GNUNET_CLIENT_receive (h->client_notifications,
592 &main_notify_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
593 if (NULL != (init = h->init))
595 /* mark so we don't call init on reconnect */
598 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
599 _("Successfully connected to core service.\n"));
601 GNUNET_CRYPTO_hash (&m->publicKey,
603 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
604 &my_identity.hashPubKey);
605 init (h->cls, h, &my_identity, &m->publicKey);
611 reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
613 struct GNUNET_CORE_Handle *h = cls;
614 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
620 * Function called when we are ready to transmit our
621 * "START" message (or when this operation timed out).
624 * @param size number of bytes available in buf
625 * @param buf where the callee should write the message
626 * @return number of bytes written to buf
629 transmit_start (void *cls, size_t size, void *buf)
631 struct GNUNET_CORE_Handle *h = cls;
632 struct InitMessage *init;
637 struct GNUNET_TIME_Relative delay;
642 if ((h->init == NULL) ||
643 (GNUNET_TIME_absolute_get ().value < h->startup_timeout.value))
645 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
646 _("Failed to connect to core service, retrying.\n"));
647 delay = GNUNET_TIME_absolute_get_remaining (h->startup_timeout);
648 if ((h->init == NULL) || (delay.value > 1000))
649 delay = GNUNET_TIME_UNIT_SECONDS;
652 GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_MINUTES);
654 GNUNET_SCHEDULER_add_delayed (h->sched,
655 delay, &reconnect_task, h);
658 /* timeout on initial connect */
659 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
660 _("Failed to connect to core service, giving up.\n"));
661 h->init (h->cls, NULL, NULL, NULL);
662 GNUNET_CORE_disconnect (h);
665 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
666 GNUNET_assert (size >= msize);
668 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
669 init->header.size = htons (msize);
670 opt = GNUNET_CORE_OPTION_NOTHING;
671 if (h->pre_connects != NULL)
672 opt |= GNUNET_CORE_OPTION_SEND_PRE_CONNECT;
673 if (h->connects != NULL)
674 opt |= GNUNET_CORE_OPTION_SEND_CONNECT;
675 if (h->disconnects != NULL)
676 opt |= GNUNET_CORE_OPTION_SEND_DISCONNECT;
677 if (h->inbound_notify != NULL)
679 if (h->inbound_hdr_only)
680 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
682 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
684 if (h->outbound_notify != NULL)
686 if (h->outbound_hdr_only)
687 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
689 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
691 init->options = htonl (opt);
692 ts = (uint16_t *) & init[1];
693 for (hpos = 0; hpos < h->hcnt; hpos++)
694 ts[hpos] = htons (h->handlers[hpos].type);
695 GNUNET_CLIENT_receive (h->client_notifications,
698 GNUNET_TIME_absolute_get_remaining
699 (h->startup_timeout));
700 return sizeof (struct InitMessage) + h->hcnt * sizeof (uint16_t);
705 * Connect to the core service. Note that the connection may
706 * complete (or fail) asynchronously.
708 * @param sched scheduler to use
709 * @param cfg configuration to use
710 * @param timeout after how long should we give up trying to connect to the core service?
711 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
712 * @param init callback to call on timeout or once we have successfully
713 * connected to the core service; note that timeout is only meaningful if init is not NULL
714 * @param pre_connects function to call on peer pre-connect (no session key yet), can be NULL
715 * @param connects function to call on peer connect, can be NULL
716 * @param disconnects function to call on peer disconnect / timeout, can be NULL
717 * @param inbound_notify function to call for all inbound messages, can be NULL
718 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
719 * GNUNET_MessageHeader and hence we do not need to give it the full message;
720 * can be used to improve efficiency, ignored if inbound_notify is NULLL
721 * @param outbound_notify function to call for all outbound messages, can be NULL
722 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
723 * GNUNET_MessageHeader and hence we do not need to give it the full message
724 * can be used to improve efficiency, ignored if outbound_notify is NULLL
725 * @param handlers callbacks for messages we care about, NULL-terminated
726 * @return handle to the core service (only useful for disconnect until 'init' is called);
727 * NULL on error (in this case, init is never called)
729 struct GNUNET_CORE_Handle *
730 GNUNET_CORE_connect (struct GNUNET_SCHEDULER_Handle *sched,
731 const struct GNUNET_CONFIGURATION_Handle *cfg,
732 struct GNUNET_TIME_Relative timeout,
734 GNUNET_CORE_StartupCallback init,
735 GNUNET_CORE_ConnectEventHandler pre_connects,
736 GNUNET_CORE_ConnectEventHandler connects,
737 GNUNET_CORE_DisconnectEventHandler disconnects,
738 GNUNET_CORE_MessageCallback inbound_notify,
739 int inbound_hdr_only,
740 GNUNET_CORE_MessageCallback outbound_notify,
741 int outbound_hdr_only,
742 const struct GNUNET_CORE_MessageHandler *handlers)
744 struct GNUNET_CORE_Handle *h;
746 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
751 h->pre_connects = pre_connects;
752 h->connects = connects;
753 h->disconnects = disconnects;
754 h->inbound_notify = inbound_notify;
755 h->outbound_notify = outbound_notify;
756 h->inbound_hdr_only = inbound_hdr_only;
757 h->outbound_hdr_only = outbound_hdr_only;
758 h->handlers = handlers;
759 h->client_notifications = GNUNET_CLIENT_connect (sched, "core", cfg);
760 if (h->client_notifications == NULL)
765 h->startup_timeout = GNUNET_TIME_relative_to_absolute (timeout);
767 while (handlers[h->hcnt].callback != NULL)
769 GNUNET_assert (h->hcnt <
770 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
771 sizeof (struct InitMessage)) / sizeof (uint16_t));
773 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
774 "Trying to connect to core service in next %llu ms.\n",
778 GNUNET_CLIENT_notify_transmit_ready (h->client_notifications,
779 sizeof (struct InitMessage) +
780 sizeof (uint16_t) * h->hcnt, timeout,
788 * Disconnect from the core service.
790 * @param handle connection to core to disconnect
793 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
795 if (handle->th != NULL)
796 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
797 if (handle->solicit_transmit_req != NULL)
798 GNUNET_CORE_notify_transmit_ready_cancel (handle->solicit_transmit_req);
799 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
800 GNUNET_SCHEDULER_cancel (handle->sched, handle->reconnect_task);
801 GNUNET_CLIENT_disconnect (handle->client_notifications);
802 if (handle->client_requests != NULL)
803 GNUNET_CLIENT_disconnect (handle->client_requests);
804 GNUNET_free_non_null (handle->solicit_buffer);
805 GNUNET_free (handle);
810 * Build the message requesting data transmission.
813 produce_send (void *cls, size_t size, void *buf)
815 struct GNUNET_CORE_TransmitHandle *th = cls;
816 struct GNUNET_CORE_Handle *h;
817 struct SendMessage *sm;
819 GNUNET_CONNECTION_TransmitReadyNotify notify;
825 /* timeout or error */
827 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
828 "P2P transmission request for `%4s' timed out.\n",
829 GNUNET_i2s(&th->peer));
831 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
832 GNUNET_CORE_notify_transmit_ready_cancel (th);
833 trigger_next_request (h);
837 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
838 "Preparing for P2P transmission to `%4s'.\n",
839 GNUNET_i2s(&th->peer));
841 GNUNET_assert (th->timeout_task != GNUNET_SCHEDULER_NO_TASK);
842 sm = (struct SendMessage *) buf;
843 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
844 sm->priority = htonl (th->priority);
845 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
848 notify_cls = th->notify_cls;
849 GNUNET_CORE_notify_transmit_ready_cancel (th);
850 trigger_next_request (h);
851 GNUNET_assert (size >= sizeof (struct SendMessage));
852 dt = notify (notify_cls, size - sizeof (struct SendMessage), &sm[1]);
855 /* client decided to send nothing! */
858 GNUNET_assert (dt >= sizeof (struct GNUNET_MessageHeader));
859 sm->header.size = htons (dt + sizeof (struct SendMessage));
860 GNUNET_assert (dt + sizeof (struct SendMessage) < size);
861 return dt + sizeof (struct SendMessage);
866 * Ask the core to call "notify" once it is ready to transmit the
867 * given number of bytes to the specified "target". If we are not yet
868 * connected to the specified peer, a call to this function will cause
869 * us to try to establish a connection.
871 * @param handle connection to core service
872 * @param priority how important is the message?
873 * @param maxdelay how long can the message wait?
874 * @param target who should receive the message,
875 * use NULL for this peer (loopback)
876 * @param notify_size how many bytes of buffer space does notify want?
877 * @param notify function to call when buffer space is available
878 * @param notify_cls closure for notify
879 * @return non-NULL if the notify callback was queued,
880 * NULL if we can not even queue the request (insufficient
881 * memory); if NULL is returned, "notify" will NOT be called.
883 struct GNUNET_CORE_TransmitHandle *
884 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
885 unsigned int priority,
886 struct GNUNET_TIME_Relative maxdelay,
887 const struct GNUNET_PeerIdentity *target,
889 GNUNET_CONNECTION_TransmitReadyNotify notify,
892 struct GNUNET_CORE_TransmitHandle *th;
894 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
895 GNUNET_SERVER_MAX_MESSAGE_SIZE);
896 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
899 th->prev = handle->pending_tail;
900 if (handle->pending_tail == NULL)
901 handle->pending_head = th;
903 handle->pending_tail->next = th;
904 th->get_message = &produce_send;
905 th->get_message_cls = th;
907 th->notify_cls = notify_cls;
909 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
910 th->timeout_task = GNUNET_SCHEDULER_add_delayed (handle->sched,
912 &timeout_request, th);
913 th->priority = priority;
914 th->msize = sizeof (struct SendMessage) + notify_size;
915 /* was the request queue previously empty? */
916 if ( (handle->pending_head == th) &&
917 (handle->th == NULL) )
918 trigger_next_request (handle);
924 * Cancel the specified transmission-ready notification.
926 * @param h handle that was returned by "notify_transmit_ready".
929 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
932 struct GNUNET_CORE_Handle *handle = h->ch;
934 if (handle->submitted == h)
936 handle->submitted = NULL;
941 handle->pending_head = h->next;
943 h->prev->next = h->next;
945 handle->pending_tail = h->prev;
947 h->next->prev = h->prev;
949 if (h->timeout_task != GNUNET_SCHEDULER_NO_TASK)
950 GNUNET_SCHEDULER_cancel (handle->sched, h->timeout_task);
955 /* end of core_api.c */