2 This file is part of GNUnet.
3 (C) 2009-2013 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 3, 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 transport/transport_api.c
23 * @brief library to access the low-level P2P IO service
24 * @author Christian Grothoff
30 #include "gnunet_util_lib.h"
31 #include "gnunet_constants.h"
32 #include "gnunet_arm_service.h"
33 #include "gnunet_hello_lib.h"
34 #include "gnunet_protocols.h"
35 #include "gnunet_transport_service.h"
36 #include "transport.h"
38 #define LOG(kind,...) GNUNET_log_from (kind, "transport-api",__VA_ARGS__)
41 * How large to start with for the hashmap of neighbours.
43 #define STARTING_NEIGHBOURS_SIZE 16
46 * Handle for a message that should be transmitted to the service.
47 * Used for both control messages and normal messages.
49 struct GNUNET_TRANSPORT_TransmitHandle
53 * We keep all requests in a DLL.
55 struct GNUNET_TRANSPORT_TransmitHandle *next;
58 * We keep all requests in a DLL.
60 struct GNUNET_TRANSPORT_TransmitHandle *prev;
63 * Neighbour for this handle, NULL for control messages.
65 struct Neighbour *neighbour;
68 * Function to call when notify_size bytes are available
71 GNUNET_CONNECTION_TransmitReadyNotify notify;
79 * Timeout for this request, 0 for control messages.
81 struct GNUNET_TIME_Absolute timeout;
84 * Task to trigger request timeout if the request is stalled due to
87 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
90 * How many bytes is our notify callback waiting for?
95 * How important is this message? Not used for control messages.
103 * Entry in hash table of all of our current neighbours.
108 * Overall transport handle.
110 struct GNUNET_TRANSPORT_Handle *h;
113 * Active transmit handle or NULL.
115 struct GNUNET_TRANSPORT_TransmitHandle *th;
118 * Identity of this neighbour.
120 struct GNUNET_PeerIdentity id;
123 * Outbound bandwidh tracker.
125 struct GNUNET_BANDWIDTH_Tracker out_tracker;
128 * Entry in our readyness heap (which is sorted by 'next_ready'
129 * value). NULL if there is no pending transmission request for
130 * this neighbour or if we're waiting for 'is_ready' to become
131 * true AFTER the 'out_tracker' suggested that this peer's quota
132 * has been satisfied (so once 'is_ready' goes to GNUNET_YES,
133 * we should immediately go back into the heap).
135 struct GNUNET_CONTAINER_HeapNode *hn;
138 * Is this peer currently ready to receive a message?
143 * Sending consumed more bytes on wire than payload was announced
144 * This overhead is added to the delay of next sending operation
146 size_t traffic_overhead;
151 * Linked list of functions to call whenever our HELLO is updated.
153 struct GNUNET_TRANSPORT_GetHelloHandle
157 * This is a doubly linked list.
159 struct GNUNET_TRANSPORT_GetHelloHandle *next;
162 * This is a doubly linked list.
164 struct GNUNET_TRANSPORT_GetHelloHandle *prev;
169 struct GNUNET_TRANSPORT_Handle *handle;
172 * Callback to call once we got our HELLO.
174 GNUNET_TRANSPORT_HelloUpdateCallback rec;
177 * Task for calling the HelloUpdateCallback when we already have a HELLO
179 GNUNET_SCHEDULER_TaskIdentifier notify_task;
182 * Closure for @e rec.
189 * Linked list for all try-connect requests
191 struct GNUNET_TRANSPORT_TryConnectHandle
196 struct GNUNET_TRANSPORT_TryConnectHandle *prev;
201 struct GNUNET_TRANSPORT_TryConnectHandle *next;
203 struct GNUNET_PeerIdentity pid;
205 struct GNUNET_TRANSPORT_Handle *th;
207 struct GNUNET_TRANSPORT_TransmitHandle *tth;
209 GNUNET_TRANSPORT_TryConnectCallback cb;
219 * Linked list for all try-connect requests
221 struct GNUNET_TRANSPORT_OfferHelloHandle
226 struct GNUNET_TRANSPORT_OfferHelloHandle *prev;
231 struct GNUNET_TRANSPORT_OfferHelloHandle *next;
233 struct GNUNET_TRANSPORT_Handle *th;
235 struct GNUNET_TRANSPORT_TransmitHandle *tth;
237 GNUNET_SCHEDULER_Task cont;
240 * Closure for @e cont
244 struct GNUNET_MessageHeader *msg;
249 * Handle for the transport service (includes all of the
250 * state for the transport service).
252 struct GNUNET_TRANSPORT_Handle
256 * Closure for the callbacks.
261 * Function to call for received data.
263 GNUNET_TRANSPORT_ReceiveCallback rec;
266 * function to call on connect events
268 GNUNET_TRANSPORT_NotifyConnect nc_cb;
271 * function to call on disconnect events
273 GNUNET_TRANSPORT_NotifyDisconnect nd_cb;
276 * Head of DLL of control messages.
278 struct GNUNET_TRANSPORT_TransmitHandle *control_head;
281 * Tail of DLL of control messages.
283 struct GNUNET_TRANSPORT_TransmitHandle *control_tail;
286 * The current HELLO message for this peer. Updated
287 * whenever transports change their addresses.
289 struct GNUNET_HELLO_Message *my_hello;
292 * My client connection to the transport service.
294 struct GNUNET_CLIENT_Connection *client;
297 * Handle to our registration with the client for notification.
299 struct GNUNET_CLIENT_TransmitHandle *cth;
302 * Linked list of pending requests for our HELLO.
304 struct GNUNET_TRANSPORT_GetHelloHandle *hwl_head;
307 * Linked list of pending requests for our HELLO.
309 struct GNUNET_TRANSPORT_GetHelloHandle *hwl_tail;
312 * Linked list of pending try connect requests head
314 struct GNUNET_TRANSPORT_TryConnectHandle *tc_head;
317 * Linked list of pending try connect requests tail
319 struct GNUNET_TRANSPORT_TryConnectHandle *tc_tail;
322 * Linked list of pending offer HELLO requests head
324 struct GNUNET_TRANSPORT_OfferHelloHandle *oh_head;
327 * Linked list of pending offer HELLO requests tail
329 struct GNUNET_TRANSPORT_OfferHelloHandle *oh_tail;
334 const struct GNUNET_CONFIGURATION_Handle *cfg;
337 * Hash map of the current connected neighbours of this peer.
338 * Maps peer identities to 'struct Neighbour' entries.
340 struct GNUNET_CONTAINER_MultiPeerMap *neighbours;
343 * Heap sorting peers with pending messages by the timestamps that
344 * specify when we could next send a message to the respective peer.
345 * Excludes control messages (which can always go out immediately).
346 * Maps time stamps to 'struct Neighbour' entries.
348 struct GNUNET_CONTAINER_Heap *ready_heap;
351 * Peer identity as assumed by this process, or all zeros.
353 struct GNUNET_PeerIdentity self;
356 * ID of the task trying to reconnect to the service.
358 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
361 * ID of the task trying to trigger transmission for a peer while
362 * maintaining bandwidth quotas. In use if there are no control
363 * messages and the smallest entry in the 'ready_heap' has a time
364 * stamp in the future.
366 GNUNET_SCHEDULER_TaskIdentifier quota_task;
369 * Delay until we try to reconnect.
371 struct GNUNET_TIME_Relative reconnect_delay;
374 * Should we check that @e self matches what the service thinks?
375 * (if #GNUNET_NO, then @e self is all zeros!).
380 * Reconnect in progress
388 * Schedule the task to send one message, either from the control
389 * list or the peer message queues to the service.
391 * @param h transport service to schedule a transmission for
394 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h);
398 * Function that will schedule the job that will try
399 * to connect us again to the client.
401 * @param h transport service to reconnect
404 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h);
408 * Get the neighbour list entry for the given peer
410 * @param h our context
411 * @param peer peer to look up
412 * @return NULL if no such peer entry exists
414 static struct Neighbour *
415 neighbour_find (struct GNUNET_TRANSPORT_Handle *h,
416 const struct GNUNET_PeerIdentity *peer)
418 return GNUNET_CONTAINER_multipeermap_get (h->neighbours, peer);
424 outbound_bw_tracker_update (void *cls)
426 struct Neighbour *n = cls;
427 struct GNUNET_TIME_Relative delay;
431 delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker,
432 n->th->notify_size + n->traffic_overhead);
433 GNUNET_CONTAINER_heap_update_cost (n->h->ready_heap,
434 n->hn, delay.rel_value_us);
435 schedule_transmission (n->h);
440 * Add neighbour to our list
442 * @return NULL if this API is currently disconnecting from the service
444 static struct Neighbour *
445 neighbour_add (struct GNUNET_TRANSPORT_Handle *h,
446 const struct GNUNET_PeerIdentity *pid)
450 LOG (GNUNET_ERROR_TYPE_DEBUG,
451 "Creating entry for neighbour `%4s'.\n",
453 n = GNUNET_new (struct Neighbour);
456 n->is_ready = GNUNET_YES;
457 n->traffic_overhead = 0;
458 GNUNET_BANDWIDTH_tracker_init (&n->out_tracker,
459 outbound_bw_tracker_update, n,
460 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
461 MAX_BANDWIDTH_CARRY_S);
462 GNUNET_assert (GNUNET_OK ==
463 GNUNET_CONTAINER_multipeermap_put (h->neighbours,
465 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
471 * Iterator over hash map entries, for deleting state of a neighbour.
473 * @param cls the `struct GNUNET_TRANSPORT_Handle *`
474 * @param key peer identity
475 * @param value value in the hash map, the neighbour entry to delete
476 * @return #GNUNET_YES if we should continue to
481 neighbour_delete (void *cls,
482 const struct GNUNET_PeerIdentity *key, void *value)
484 struct GNUNET_TRANSPORT_Handle *handle = cls;
485 struct Neighbour *n = value;
487 if (NULL != handle->nd_cb)
488 handle->nd_cb (handle->cls, &n->id);
489 GNUNET_assert (NULL == n->th);
490 GNUNET_assert (NULL == n->hn);
491 GNUNET_assert (GNUNET_YES ==
492 GNUNET_CONTAINER_multipeermap_remove (handle->neighbours, key,
498 static int reconnecting;
501 * Function we use for handling incoming messages.
503 * @param cls closure, a `struct GNUNET_TRANSPORT_Handle *`
504 * @param msg message received, NULL on timeout or fatal error
507 demultiplexer (void *cls, const struct GNUNET_MessageHeader *msg)
509 struct GNUNET_TRANSPORT_Handle *h = cls;
510 const struct DisconnectInfoMessage *dim;
511 const struct ConnectInfoMessage *cim;
512 const struct InboundMessage *im;
513 const struct GNUNET_MessageHeader *imm;
514 const struct SendOkMessage *okm;
515 const struct QuotaSetMessage *qm;
516 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
517 struct GNUNET_TRANSPORT_GetHelloHandle *next_hwl;
519 struct GNUNET_PeerIdentity me;
522 uint32_t bytes_physical;
524 GNUNET_assert (NULL != h->client);
525 if (GNUNET_YES == reconnecting)
531 LOG (GNUNET_ERROR_TYPE_DEBUG,
532 "Error receiving from transport service, disconnecting temporarily.\n");
533 reconnecting = GNUNET_YES;
534 disconnect_and_schedule_reconnect (h);
537 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
538 GNUNET_TIME_UNIT_FOREVER_REL);
539 size = ntohs (msg->size);
540 switch (ntohs (msg->type))
542 case GNUNET_MESSAGE_TYPE_HELLO:
544 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) msg, &me))
549 LOG (GNUNET_ERROR_TYPE_DEBUG,
550 "Receiving (my own) `%s' message, I am `%4s'.\n", "HELLO",
552 GNUNET_free_non_null (h->my_hello);
554 if (size < sizeof (struct GNUNET_MessageHeader))
559 h->my_hello = GNUNET_malloc (size);
560 memcpy (h->my_hello, msg, size);
564 next_hwl = hwl->next;
565 hwl->rec (hwl->rec_cls,
566 (const struct GNUNET_MessageHeader *) h->my_hello);
570 case GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT:
571 if (size < sizeof (struct ConnectInfoMessage))
576 cim = (const struct ConnectInfoMessage *) msg;
578 sizeof (struct ConnectInfoMessage))
583 LOG (GNUNET_ERROR_TYPE_DEBUG,
584 "Receiving `%s' message for `%4s'.\n",
585 "CONNECT", GNUNET_i2s (&cim->id));
586 n = neighbour_find (h, &cim->id);
592 n = neighbour_add (h, &cim->id);
593 LOG (GNUNET_ERROR_TYPE_DEBUG,
594 "Receiving `%s' message for `%4s' with quota %u\n",
596 GNUNET_i2s (&cim->id),
597 ntohl (cim->quota_out.value__));
598 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, cim->quota_out);
599 if (h->nc_cb != NULL)
600 h->nc_cb (h->cls, &n->id);
602 case GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT:
603 if (size != sizeof (struct DisconnectInfoMessage))
608 dim = (const struct DisconnectInfoMessage *) msg;
609 GNUNET_break (ntohl (dim->reserved) == 0);
610 LOG (GNUNET_ERROR_TYPE_DEBUG,
611 "Receiving `%s' message for `%4s'.\n",
612 "DISCONNECT", GNUNET_i2s (&dim->peer));
613 n = neighbour_find (h, &dim->peer);
619 neighbour_delete (h, &dim->peer, n);
621 case GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK:
622 if (size != sizeof (struct SendOkMessage))
627 okm = (const struct SendOkMessage *) msg;
628 bytes_msg = ntohl (okm->bytes_msg);
629 bytes_physical = ntohl (okm->bytes_physical);
630 LOG (GNUNET_ERROR_TYPE_DEBUG,
631 "Receiving SEND_OK message, transmission %s.\n",
632 ntohl (okm->success) == GNUNET_OK ? "succeeded" : "failed");
634 n = neighbour_find (h, &okm->peer);
638 if (bytes_physical >= bytes_msg)
640 LOG (GNUNET_ERROR_TYPE_DEBUG,
641 "Overhead for %u byte message: %u\n",
642 bytes_msg, bytes_physical - bytes_msg);
643 n->traffic_overhead += bytes_physical - bytes_msg;
645 GNUNET_break (GNUNET_NO == n->is_ready);
646 n->is_ready = GNUNET_YES;
647 if ((NULL != n->th) && (NULL == n->hn))
649 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->th->timeout_task);
650 GNUNET_SCHEDULER_cancel (n->th->timeout_task);
651 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
652 /* we've been waiting for this (congestion, not quota,
653 * caused delayed transmission) */
654 n->hn = GNUNET_CONTAINER_heap_insert (h->ready_heap, n, 0);
655 schedule_transmission (h);
658 case GNUNET_MESSAGE_TYPE_TRANSPORT_RECV:
659 LOG (GNUNET_ERROR_TYPE_DEBUG,
660 "Receiving `%s' message.\n",
663 sizeof (struct InboundMessage) + sizeof (struct GNUNET_MessageHeader))
668 im = (const struct InboundMessage *) msg;
669 imm = (const struct GNUNET_MessageHeader *) &im[1];
670 if (ntohs (imm->size) + sizeof (struct InboundMessage) != size)
675 LOG (GNUNET_ERROR_TYPE_DEBUG,
676 "Received message of type %u from `%4s'.\n",
677 ntohs (imm->type), GNUNET_i2s (&im->peer));
678 n = neighbour_find (h, &im->peer);
685 h->rec (h->cls, &im->peer, imm);
687 case GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA:
688 LOG (GNUNET_ERROR_TYPE_DEBUG,
689 "Receiving `%s' message.\n", "SET_QUOTA");
690 if (size != sizeof (struct QuotaSetMessage))
695 qm = (const struct QuotaSetMessage *) msg;
696 n = neighbour_find (h, &qm->peer);
699 LOG (GNUNET_ERROR_TYPE_DEBUG,
700 "Receiving `%s' message for `%4s' with quota %u\n",
702 GNUNET_i2s (&qm->peer),
703 ntohl (qm->quota.value__));
704 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, qm->quota);
707 LOG (GNUNET_ERROR_TYPE_ERROR,
708 _("Received unexpected message of type %u in %s:%u\n"),
709 ntohs (msg->type), __FILE__, __LINE__);
717 * A transmission request could not be satisfied because of
718 * network congestion. Notify the initiator and clean up.
720 * @param cls the `struct GNUNET_TRANSPORT_TransmitHandle`
721 * @param tc scheduler context
724 timeout_request_due_to_congestion (void *cls,
725 const struct GNUNET_SCHEDULER_TaskContext *tc)
727 struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
728 struct Neighbour *n = th->neighbour;
730 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
731 GNUNET_assert (th == n->th);
732 GNUNET_assert (NULL == n->hn);
734 th->notify (th->notify_cls, 0, NULL);
740 * Transmit message(s) to service.
742 * @param cls handle to transport
743 * @param size number of bytes available in @a buf
744 * @param buf where to copy the message
745 * @return number of bytes copied to @a buf
748 transport_notify_ready (void *cls, size_t size, void *buf)
750 struct GNUNET_TRANSPORT_Handle *h = cls;
751 struct GNUNET_TRANSPORT_TransmitHandle *th;
754 struct OutboundMessage obm;
759 GNUNET_assert (NULL != h->client);
763 /* transmission failed */
764 disconnect_and_schedule_reconnect (h);
770 /* first send control messages */
771 while ((NULL != (th = h->control_head)) && (th->notify_size <= size))
773 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
774 nret = th->notify (th->notify_cls, size, &cbuf[ret]);
775 LOG (GNUNET_ERROR_TYPE_DEBUG,
776 "Added %u bytes of control message at %u\n",
783 /* then, if possible and no control messages pending, send data messages */
784 while ((NULL == h->control_head) &&
785 (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))))
787 if (GNUNET_YES != n->is_ready)
789 /* peer not ready, wait for notification! */
790 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
792 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == n->th->timeout_task);
793 n->th->timeout_task =
794 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
796 &timeout_request_due_to_congestion,
801 if (th->notify_size + sizeof (struct OutboundMessage) > size)
802 break; /* does not fit */
803 if (GNUNET_BANDWIDTH_tracker_get_delay
804 (&n->out_tracker, th->notify_size).rel_value_us > 0)
805 break; /* too early */
806 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
809 n->is_ready = GNUNET_NO;
810 GNUNET_assert (size >= sizeof (struct OutboundMessage));
812 th->notify (th->notify_cls, size - sizeof (struct OutboundMessage),
813 &cbuf[ret + sizeof (struct OutboundMessage)]);
814 GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
817 GNUNET_assert (mret + sizeof (struct OutboundMessage) <
818 GNUNET_SERVER_MAX_MESSAGE_SIZE);
819 obm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND);
820 obm.header.size = htons (mret + sizeof (struct OutboundMessage));
821 obm.priority = htonl (th->priority);
823 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
826 memcpy (&cbuf[ret], &obm, sizeof (struct OutboundMessage));
827 ret += (mret + sizeof (struct OutboundMessage));
828 size -= (mret + sizeof (struct OutboundMessage));
829 GNUNET_BANDWIDTH_tracker_consume (&n->out_tracker, mret);
833 /* if there are more pending messages, try to schedule those */
834 schedule_transmission (h);
835 LOG (GNUNET_ERROR_TYPE_DEBUG,
836 "Transmitting %u bytes to transport service\n",
843 * Schedule the task to send one message, either from the control
844 * list or the peer message queues to the service.
846 * @param cls transport service to schedule a transmission for
847 * @param tc scheduler context
850 schedule_transmission_task (void *cls,
851 const struct GNUNET_SCHEDULER_TaskContext *tc)
853 struct GNUNET_TRANSPORT_Handle *h = cls;
855 struct GNUNET_TRANSPORT_TransmitHandle *th;
858 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
859 GNUNET_assert (NULL != h->client);
860 /* destroy all requests that have timed out */
861 while ((NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))) &&
862 (0 == GNUNET_TIME_absolute_get_remaining (n->th->timeout).rel_value_us))
864 /* notify client that the request could not be satisfied within
865 * the given time constraints */
868 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
870 LOG (GNUNET_ERROR_TYPE_DEBUG,
871 "Signalling timeout for transmission to peer %s due to congestion\n",
872 GNUNET_i2s (&n->id));
873 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
878 if (NULL != h->control_head)
880 size = h->control_head->notify_size;
884 n = GNUNET_CONTAINER_heap_peek (h->ready_heap);
886 return; /* no pending messages */
887 size = n->th->notify_size + sizeof (struct OutboundMessage);
889 LOG (GNUNET_ERROR_TYPE_DEBUG, "Calling notify_transmit_ready\n");
891 GNUNET_CLIENT_notify_transmit_ready (h->client, size,
892 GNUNET_TIME_UNIT_FOREVER_REL,
893 GNUNET_NO, &transport_notify_ready,
895 GNUNET_assert (NULL != h->cth);
900 * Schedule the task to send one message, either from the control
901 * list or the peer message queues to the service.
903 * @param h transport service to schedule a transmission for
906 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h)
908 struct GNUNET_TIME_Relative delay;
911 GNUNET_assert (NULL != h->client);
912 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
914 GNUNET_SCHEDULER_cancel (h->quota_task);
915 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
917 if (NULL != h->control_head)
918 delay = GNUNET_TIME_UNIT_ZERO;
919 else if (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap)))
922 GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker,
923 n->th->notify_size + n->traffic_overhead);
924 n->traffic_overhead = 0;
927 return; /* no work to be done */
928 LOG (GNUNET_ERROR_TYPE_DEBUG,
929 "Scheduling next transmission to service in %s\n",
930 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
932 GNUNET_SCHEDULER_add_delayed (delay, &schedule_transmission_task, h);
937 * Queue control request for transmission to the transport
940 * @param h handle to the transport service
941 * @param size number of bytes to be transmitted
942 * @param notify function to call to get the content
943 * @param notify_cls closure for @a notify
944 * @return a `struct GNUNET_TRANSPORT_TransmitHandle`
946 static struct GNUNET_TRANSPORT_TransmitHandle *
947 schedule_control_transmit (struct GNUNET_TRANSPORT_Handle *h, size_t size,
948 GNUNET_CONNECTION_TransmitReadyNotify notify,
951 struct GNUNET_TRANSPORT_TransmitHandle *th;
953 LOG (GNUNET_ERROR_TYPE_DEBUG,
954 "Control transmit of %u bytes requested\n",
956 th = GNUNET_new (struct GNUNET_TRANSPORT_TransmitHandle);
958 th->notify_cls = notify_cls;
959 th->notify_size = size;
960 GNUNET_CONTAINER_DLL_insert_tail (h->control_head, h->control_tail, th);
961 schedule_transmission (h);
967 * Transmit START message to service.
970 * @param size number of bytes available in @a buf
971 * @param buf where to copy the message
972 * @return number of bytes copied to @a buf
975 send_start (void *cls, size_t size, void *buf)
977 struct GNUNET_TRANSPORT_Handle *h = cls;
978 struct StartMessage s;
983 /* Can only be shutdown, just give up */
984 LOG (GNUNET_ERROR_TYPE_DEBUG,
985 "Shutdown while trying to transmit `%s' request.\n",
989 LOG (GNUNET_ERROR_TYPE_DEBUG,
990 "Transmitting `%s' request.\n",
992 GNUNET_assert (size >= sizeof (struct StartMessage));
993 s.header.size = htons (sizeof (struct StartMessage));
994 s.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
1000 s.options = htonl (options);
1002 memcpy (buf, &s, sizeof (struct StartMessage));
1003 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
1004 GNUNET_TIME_UNIT_FOREVER_REL);
1005 return sizeof (struct StartMessage);
1010 * Try again to connect to transport service.
1012 * @param cls the handle to the transport service
1013 * @param tc scheduler context
1016 reconnect (void *cls,
1017 const struct GNUNET_SCHEDULER_TaskContext *tc)
1019 struct GNUNET_TRANSPORT_Handle *h = cls;
1021 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1022 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1024 /* shutdown, just give up */
1027 LOG (GNUNET_ERROR_TYPE_DEBUG,
1028 "Connecting to transport service.\n");
1029 GNUNET_assert (NULL == h->client);
1030 GNUNET_assert (NULL == h->control_head);
1031 GNUNET_assert (NULL == h->control_tail);
1032 reconnecting = GNUNET_NO;
1033 h->client = GNUNET_CLIENT_connect ("transport", h->cfg);
1035 GNUNET_assert (NULL != h->client);
1036 schedule_control_transmit (h, sizeof (struct StartMessage), &send_start, h);
1041 * Function that will schedule the job that will try
1042 * to connect us again to the client.
1044 * @param h transport service to reconnect
1047 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
1049 struct GNUNET_TRANSPORT_TransmitHandle *th;
1051 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
1054 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
1057 if (NULL != h->client)
1059 GNUNET_CLIENT_disconnect (h->client);
1061 /* LOG (GNUNET_ERROR_TYPE_ERROR,
1062 "Client disconnect done \n");*/
1064 /* Forget about all neighbours that we used to be connected to */
1065 GNUNET_CONTAINER_multipeermap_iterate (h->neighbours,
1066 &neighbour_delete, h);
1067 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
1069 GNUNET_SCHEDULER_cancel (h->quota_task);
1070 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
1072 while ((NULL != (th = h->control_head)))
1074 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
1075 th->notify (th->notify_cls, 0, NULL);
1078 LOG (GNUNET_ERROR_TYPE_DEBUG,
1079 "Scheduling task to reconnect to transport service in %s.\n",
1080 GNUNET_STRINGS_relative_time_to_string(h->reconnect_delay, GNUNET_YES));
1082 GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
1083 h->reconnect_delay = GNUNET_TIME_STD_BACKOFF (h->reconnect_delay);
1088 * Cancel control request for transmission to the transport service.
1090 * @param th handle to the transport service
1091 * @param tth transmit handle to cancel
1094 cancel_control_transmit (struct GNUNET_TRANSPORT_Handle *th,
1095 struct GNUNET_TRANSPORT_TransmitHandle *tth)
1097 LOG (GNUNET_ERROR_TYPE_DEBUG,
1098 "Canceling transmit of contral transmission requested\n");
1099 GNUNET_CONTAINER_DLL_remove (th->control_head, th->control_tail, tth);
1106 * Send REQUEST_CONNECT message to the service.
1108 * @param cls the `struct GNUNET_PeerIdentity`
1109 * @param size number of bytes available in @a buf
1110 * @param buf where to copy the message
1111 * @return number of bytes copied to @a buf
1114 send_try_connect (void *cls, size_t size, void *buf)
1116 struct GNUNET_TRANSPORT_TryConnectHandle *tch = cls;
1117 struct TransportRequestConnectMessage msg;
1121 if (NULL != tch->cb)
1122 tch->cb (tch->cb_cls, GNUNET_SYSERR);
1123 GNUNET_CONTAINER_DLL_remove (tch->th->tc_head, tch->th->tc_tail, tch);
1124 LOG (GNUNET_ERROR_TYPE_DEBUG,
1125 "Discarding `%s' request to `%4s' due to error in transport service connection.\n",
1127 GNUNET_i2s (&tch->pid));
1131 LOG (GNUNET_ERROR_TYPE_DEBUG,
1132 "Transmitting `%s' request with respect to `%4s'.\n",
1134 GNUNET_i2s (&tch->pid));
1135 GNUNET_assert (size >= sizeof (struct TransportRequestConnectMessage));
1136 msg.header.size = htons (sizeof (struct TransportRequestConnectMessage));
1137 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT);
1138 msg.reserved = htonl (0);
1139 msg.peer = tch->pid;
1140 memcpy (buf, &msg, sizeof (msg));
1141 if (NULL != tch->cb)
1142 tch->cb (tch->cb_cls, GNUNET_OK);
1143 GNUNET_CONTAINER_DLL_remove (tch->th->tc_head, tch->th->tc_tail, tch);
1145 return sizeof (struct TransportRequestConnectMessage);
1149 * Ask the transport service to establish a connection to
1152 * @param handle connection to transport service
1153 * @param target who we should try to connect to
1154 * @param cb callback to be called when request was transmitted to transport
1156 * @param cb_cls closure for the callback
1157 * @return a `struct GNUNET_TRANSPORT_TryConnectHandle` handle or
1158 * NULL on failure (cb will not be called)
1160 struct GNUNET_TRANSPORT_TryConnectHandle *
1161 GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
1162 const struct GNUNET_PeerIdentity *target,
1163 GNUNET_TRANSPORT_TryConnectCallback cb,
1166 struct GNUNET_TRANSPORT_TryConnectHandle *tch = NULL;
1168 if (NULL == handle->client)
1170 tch = GNUNET_new (struct GNUNET_TRANSPORT_TryConnectHandle);
1172 tch->pid = *(target);
1174 tch->cb_cls = cb_cls;
1175 tch->tth = schedule_control_transmit (handle,
1176 sizeof (struct TransportRequestConnectMessage),
1177 &send_try_connect, tch);
1178 GNUNET_CONTAINER_DLL_insert(handle->tc_head, handle->tc_tail, tch);
1184 * Cancel the request to transport to try a connect
1185 * Callback will not be called
1187 * @param tch the handle to cancel
1190 GNUNET_TRANSPORT_try_connect_cancel (struct GNUNET_TRANSPORT_TryConnectHandle *tch)
1192 struct GNUNET_TRANSPORT_Handle *th;
1195 cancel_control_transmit (th, tch->tth);
1196 GNUNET_CONTAINER_DLL_remove (th->tc_head, th->tc_tail, tch);
1201 * Send HELLO message to the service.
1203 * @param cls the HELLO message to send
1204 * @param size number of bytes available in @a buf
1205 * @param buf where to copy the message
1206 * @return number of bytes copied to @a buf
1209 send_hello (void *cls, size_t size, void *buf)
1211 struct GNUNET_TRANSPORT_OfferHelloHandle *ohh = cls;
1212 struct GNUNET_MessageHeader *msg = ohh->msg;
1214 struct GNUNET_SCHEDULER_TaskContext tc;
1216 tc.read_ready = NULL;
1217 tc.write_ready = NULL;
1218 tc.reason = GNUNET_SCHEDULER_REASON_TIMEOUT;
1221 LOG (GNUNET_ERROR_TYPE_DEBUG,
1222 "Timeout while trying to transmit `%s' request.\n",
1224 if (NULL != ohh->cont)
1225 ohh->cont (ohh->cls, &tc);
1227 GNUNET_CONTAINER_DLL_remove (ohh->th->oh_head, ohh->th->oh_tail, ohh);
1231 LOG (GNUNET_ERROR_TYPE_DEBUG,
1232 "Transmitting `%s' request.\n",
1234 ssize = ntohs (msg->size);
1235 GNUNET_assert (size >= ssize);
1236 memcpy (buf, msg, ssize);
1238 tc.reason = GNUNET_SCHEDULER_REASON_READ_READY;
1239 if (NULL != ohh->cont)
1240 ohh->cont (ohh->cls, &tc);
1241 GNUNET_CONTAINER_DLL_remove (ohh->th->oh_head, ohh->th->oh_tail, ohh);
1248 * Send traffic metric message to the service.
1250 * @param cls the message to send
1251 * @param size number of bytes available in @a buf
1252 * @param buf where to copy the message
1253 * @return number of bytes copied to @a buf
1256 send_metric (void *cls, size_t size, void *buf)
1258 struct TrafficMetricMessage *msg = cls;
1263 LOG (GNUNET_ERROR_TYPE_DEBUG,
1264 "Timeout while trying to transmit `%s' request.\n",
1269 LOG (GNUNET_ERROR_TYPE_DEBUG,
1270 "Transmitting `%s' request.\n",
1272 ssize = ntohs (msg->header.size);
1273 GNUNET_assert (size >= ssize);
1274 memcpy (buf, msg, ssize);
1281 * Set transport metrics for a peer and a direction
1283 * @param handle transport handle
1284 * @param peer the peer to set the metric for
1285 * @param inbound set inbound direction (#GNUNET_YES or #GNUNET_NO)
1286 * @param outbound set outbound direction (#GNUNET_YES or #GNUNET_NO)
1287 * @param ats the metric as ATS information
1288 * @param ats_count the number of metrics
1290 * Supported ATS values:
1291 * #GNUNET_ATS_QUALITY_NET_DELAY (value in ms)
1292 * #GNUNET_ATS_QUALITY_NET_DISTANCE (value in count(hops))
1295 * To enforce a delay of 10 ms for peer p1 in sending direction use:
1297 * struct GNUNET_ATS_Information ats;
1298 * ats.type = ntohl (GNUNET_ATS_QUALITY_NET_DELAY);
1299 * ats.value = ntohl (10);
1300 * GNUNET_TRANSPORT_set_traffic_metric (th, p1, TM_SEND, &ats, 1);
1303 * Delay restrictions in receiving direction will be enforced with
1307 GNUNET_TRANSPORT_set_traffic_metric (struct GNUNET_TRANSPORT_Handle *handle,
1308 const struct GNUNET_PeerIdentity *peer,
1311 const struct GNUNET_ATS_Information *ats,
1314 struct TrafficMetricMessage *msg;
1316 GNUNET_assert ((outbound == GNUNET_YES) || (outbound == GNUNET_NO));
1317 GNUNET_assert ((inbound == GNUNET_YES) || (inbound == GNUNET_NO));
1318 if ((GNUNET_NO == inbound) && (GNUNET_NO == outbound))
1323 size_t len = sizeof (struct TrafficMetricMessage) +
1324 ats_count * sizeof (struct GNUNET_ATS_Information);
1326 msg = GNUNET_malloc (len);
1327 msg->header.size = htons (len);
1328 msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TRAFFIC_METRIC);
1329 msg->direction = htons (0 + outbound + 2 * inbound);
1330 msg->ats_count = htons (ats_count);
1331 msg->peer = (*peer);
1332 memcpy (&msg[1], ats, ats_count * sizeof (struct GNUNET_ATS_Information));
1333 schedule_control_transmit (handle, len, &send_metric, msg);
1339 * Offer the transport service the HELLO of another peer. Note that
1340 * the transport service may just ignore this message if the HELLO is
1341 * malformed or useless due to our local configuration.
1343 * @param handle connection to transport service
1344 * @param hello the hello message
1345 * @param cont continuation to call when HELLO has been sent,
1346 * tc reason #GNUNET_SCHEDULER_REASON_TIMEOUT for fail
1347 * tc reasong #GNUNET_SCHEDULER_REASON_READ_READY for success
1348 * @param cls closure for continuation
1349 * @return a `struct GNUNET_TRANSPORT_OfferHelloHandle` handle or NULL on failure,
1350 * in case of failure cont will not be called
1353 struct GNUNET_TRANSPORT_OfferHelloHandle *
1354 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
1355 const struct GNUNET_MessageHeader *hello,
1356 GNUNET_SCHEDULER_Task cont, void *cls)
1358 struct GNUNET_TRANSPORT_OfferHelloHandle *ohh;
1359 struct GNUNET_MessageHeader *msg;
1360 struct GNUNET_PeerIdentity peer;
1363 if (NULL == handle->client)
1365 GNUNET_break (ntohs (hello->type) == GNUNET_MESSAGE_TYPE_HELLO);
1366 size = ntohs (hello->size);
1367 GNUNET_break (size >= sizeof (struct GNUNET_MessageHeader));
1369 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hello, &peer))
1375 msg = GNUNET_malloc (size);
1376 memcpy (msg, hello, size);
1377 LOG (GNUNET_ERROR_TYPE_DEBUG,
1378 "Offering `%s' message of `%4s' to transport for validation.\n", "HELLO",
1379 GNUNET_i2s (&peer));
1381 ohh = GNUNET_new (struct GNUNET_TRANSPORT_OfferHelloHandle);
1386 ohh->tth = schedule_control_transmit (handle, size, &send_hello, ohh);
1387 GNUNET_CONTAINER_DLL_insert (handle->oh_head, handle->oh_tail, ohh);
1393 * Cancel the request to transport to offer the HELLO message
1395 * @param ohh the GNUNET_TRANSPORT_OfferHelloHandle to cancel
1398 GNUNET_TRANSPORT_offer_hello_cancel (struct GNUNET_TRANSPORT_OfferHelloHandle *ohh)
1400 struct GNUNET_TRANSPORT_Handle *th = ohh->th;
1402 cancel_control_transmit (ohh->th, ohh->tth);
1403 GNUNET_CONTAINER_DLL_remove (th->oh_head, th->oh_tail, ohh);
1404 GNUNET_free (ohh->msg);
1410 * Checks if a given peer is connected to us
1412 * @param handle connection to transport service
1413 * @param peer the peer to check
1414 * @return #GNUNET_YES (connected) or #GNUNET_NO (disconnected)
1417 GNUNET_TRANSPORT_check_peer_connected (struct GNUNET_TRANSPORT_Handle *handle,
1418 const struct GNUNET_PeerIdentity *peer)
1421 GNUNET_CONTAINER_multipeermap_contains (handle->neighbours,
1429 * Task to call the HelloUpdateCallback of the GetHelloHandle
1431 * @param cls the `struct GNUNET_TRANSPORT_GetHelloHandle`
1432 * @param tc the scheduler task context
1435 call_hello_update_cb_async (void *cls,
1436 const struct GNUNET_SCHEDULER_TaskContext *tc)
1438 struct GNUNET_TRANSPORT_GetHelloHandle *ghh = cls;
1440 GNUNET_assert (NULL != ghh->handle->my_hello);
1441 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != ghh->notify_task);
1442 ghh->notify_task = GNUNET_SCHEDULER_NO_TASK;
1443 ghh->rec (ghh->rec_cls,
1444 (const struct GNUNET_MessageHeader *) ghh->handle->my_hello);
1449 * Obtain the HELLO message for this peer. The callback given in this function
1450 * is never called synchronously.
1452 * @param handle connection to transport service
1453 * @param rec function to call with the HELLO, sender will be our peer
1454 * identity; message and sender will be NULL on timeout
1455 * (handshake with transport service pending/failed).
1456 * cost estimate will be 0.
1457 * @param rec_cls closure for @a rec
1458 * @return handle to cancel the operation
1460 struct GNUNET_TRANSPORT_GetHelloHandle *
1461 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
1462 GNUNET_TRANSPORT_HelloUpdateCallback rec,
1465 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
1467 hwl = GNUNET_new (struct GNUNET_TRANSPORT_GetHelloHandle);
1469 hwl->rec_cls = rec_cls;
1470 hwl->handle = handle;
1471 GNUNET_CONTAINER_DLL_insert (handle->hwl_head, handle->hwl_tail, hwl);
1472 if (handle->my_hello != NULL)
1473 hwl->notify_task = GNUNET_SCHEDULER_add_now (&call_hello_update_cb_async,
1480 * Stop receiving updates about changes to our HELLO message.
1482 * @param ghh handle to cancel
1485 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_GetHelloHandle *ghh)
1487 struct GNUNET_TRANSPORT_Handle *handle = ghh->handle;
1489 if (GNUNET_SCHEDULER_NO_TASK != ghh->notify_task)
1490 GNUNET_SCHEDULER_cancel (ghh->notify_task);
1491 GNUNET_CONTAINER_DLL_remove (handle->hwl_head, handle->hwl_tail, ghh);
1497 * Connect to the transport service. Note that the connection may
1498 * complete (or fail) asynchronously.
1500 * @param cfg configuration to use
1501 * @param self our own identity (API should check that it matches
1502 * the identity found by transport), or NULL (no check)
1503 * @param cls closure for the callbacks
1504 * @param rec receive function to call
1505 * @param nc function to call on connect events
1506 * @param nd function to call on disconnect events
1508 struct GNUNET_TRANSPORT_Handle *
1509 GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1510 const struct GNUNET_PeerIdentity *self, void *cls,
1511 GNUNET_TRANSPORT_ReceiveCallback rec,
1512 GNUNET_TRANSPORT_NotifyConnect nc,
1513 GNUNET_TRANSPORT_NotifyDisconnect nd)
1515 struct GNUNET_TRANSPORT_Handle *ret;
1517 ret = GNUNET_new (struct GNUNET_TRANSPORT_Handle);
1521 ret->check_self = GNUNET_YES;
1528 ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
1529 LOG (GNUNET_ERROR_TYPE_DEBUG,
1530 "Connecting to transport service.\n");
1531 ret->client = GNUNET_CLIENT_connect ("transport", cfg);
1532 if (NULL == ret->client)
1538 GNUNET_CONTAINER_multipeermap_create (STARTING_NEIGHBOURS_SIZE,
1541 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1542 schedule_control_transmit (ret, sizeof (struct StartMessage),
1549 * Disconnect from the transport service.
1551 * @param handle handle to the service as returned from #GNUNET_TRANSPORT_connect()
1554 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
1556 LOG (GNUNET_ERROR_TYPE_DEBUG,
1557 "Transport disconnect called!\n");
1558 /* this disconnects all neighbours... */
1559 if (handle->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1560 disconnect_and_schedule_reconnect (handle);
1561 /* and now we stop trying to connect again... */
1562 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1564 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1565 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1567 GNUNET_CONTAINER_multipeermap_destroy (handle->neighbours);
1568 handle->neighbours = NULL;
1569 if (handle->quota_task != GNUNET_SCHEDULER_NO_TASK)
1571 GNUNET_SCHEDULER_cancel (handle->quota_task);
1572 handle->quota_task = GNUNET_SCHEDULER_NO_TASK;
1574 GNUNET_free_non_null (handle->my_hello);
1575 handle->my_hello = NULL;
1576 GNUNET_assert (handle->tc_head == NULL);
1577 GNUNET_assert (handle->tc_tail == NULL);
1578 GNUNET_assert (handle->hwl_head == NULL);
1579 GNUNET_assert (handle->hwl_tail == NULL);
1580 GNUNET_CONTAINER_heap_destroy (handle->ready_heap);
1581 handle->ready_heap = NULL;
1582 GNUNET_free (handle);
1587 * Check if we could queue a message of the given size for
1588 * transmission. The transport service will take both its
1589 * internal buffers and bandwidth limits imposed by the
1590 * other peer into consideration when answering this query.
1592 * @param handle connection to transport service
1593 * @param target who should receive the message
1594 * @param size how big is the message we want to transmit?
1595 * @param priority how important is the message?
1596 * @param timeout after how long should we give up (and call
1597 * notify with buf NULL and size 0)?
1598 * @param notify function to call when we are ready to
1599 * send such a message
1600 * @param notify_cls closure for @a notify
1601 * @return NULL if someone else is already waiting to be notified
1602 * non-NULL if the notify callback was queued (can be used to cancel
1603 * using #GNUNET_TRANSPORT_notify_transmit_ready_cancel)
1605 struct GNUNET_TRANSPORT_TransmitHandle *
1606 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
1607 const struct GNUNET_PeerIdentity *target,
1608 size_t size, uint32_t priority,
1609 struct GNUNET_TIME_Relative timeout,
1610 GNUNET_CONNECTION_TransmitReadyNotify notify,
1613 struct Neighbour *n;
1614 struct GNUNET_TRANSPORT_TransmitHandle *th;
1615 struct GNUNET_TIME_Relative delay;
1617 n = neighbour_find (handle, target);
1620 /* use GNUNET_TRANSPORT_try_connect first, only use this function
1621 * once a connection has been established */
1627 /* attempt to send two messages at the same time to the same peer */
1631 GNUNET_assert (NULL == n->hn);
1632 th = GNUNET_new (struct GNUNET_TRANSPORT_TransmitHandle);
1634 th->notify = notify;
1635 th->notify_cls = notify_cls;
1636 th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1637 th->notify_size = size;
1638 th->priority = priority;
1640 /* calculate when our transmission should be ready */
1641 delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, size + n->traffic_overhead);
1642 n->traffic_overhead = 0;
1643 if (delay.rel_value_us > timeout.rel_value_us)
1644 delay.rel_value_us = 0; /* notify immediately (with failure) */
1645 LOG (GNUNET_ERROR_TYPE_DEBUG,
1646 "Bandwidth tracker allows next transmission to peer %s in %s\n",
1647 GNUNET_i2s (target),
1648 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
1649 n->hn = GNUNET_CONTAINER_heap_insert (handle->ready_heap, n, delay.rel_value_us);
1650 schedule_transmission (handle);
1656 * Cancel the specified transmission-ready notification.
1658 * @param th handle returned from #GNUNET_TRANSPORT_notify_transmit_ready()
1661 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct GNUNET_TRANSPORT_TransmitHandle *th)
1663 struct Neighbour *n;
1665 GNUNET_assert (NULL == th->next);
1666 GNUNET_assert (NULL == th->prev);
1668 GNUNET_assert (th == n->th);
1672 GNUNET_CONTAINER_heap_remove_node (n->hn);
1677 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != th->timeout_task);
1678 GNUNET_SCHEDULER_cancel (th->timeout_task);
1679 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1685 /* end of transport_api.c */