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.
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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);
423 * Add neighbour to our list
425 * @return NULL if this API is currently disconnecting from the service
427 static struct Neighbour *
428 neighbour_add (struct GNUNET_TRANSPORT_Handle *h,
429 const struct GNUNET_PeerIdentity *pid)
433 LOG (GNUNET_ERROR_TYPE_DEBUG,
434 "Creating entry for neighbour `%4s'.\n",
436 n = GNUNET_new (struct Neighbour);
439 n->is_ready = GNUNET_YES;
440 n->traffic_overhead = 0;
441 GNUNET_BANDWIDTH_tracker_init (&n->out_tracker,
442 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
443 MAX_BANDWIDTH_CARRY_S);
444 GNUNET_assert (GNUNET_OK ==
445 GNUNET_CONTAINER_multipeermap_put (h->neighbours,
447 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
453 * Iterator over hash map entries, for deleting state of a neighbour.
455 * @param cls the `struct GNUNET_TRANSPORT_Handle *`
456 * @param key peer identity
457 * @param value value in the hash map, the neighbour entry to delete
458 * @return #GNUNET_YES if we should continue to
463 neighbour_delete (void *cls,
464 const struct GNUNET_PeerIdentity *key, void *value)
466 struct GNUNET_TRANSPORT_Handle *handle = cls;
467 struct Neighbour *n = value;
469 if (NULL != handle->nd_cb)
470 handle->nd_cb (handle->cls, &n->id);
471 GNUNET_assert (NULL == n->th);
472 GNUNET_assert (NULL == n->hn);
473 GNUNET_assert (GNUNET_YES ==
474 GNUNET_CONTAINER_multipeermap_remove (handle->neighbours, key,
480 static int reconnecting;
483 * Function we use for handling incoming messages.
485 * @param cls closure, a `struct GNUNET_TRANSPORT_Handle *`
486 * @param msg message received, NULL on timeout or fatal error
489 demultiplexer (void *cls, const struct GNUNET_MessageHeader *msg)
491 struct GNUNET_TRANSPORT_Handle *h = cls;
492 const struct DisconnectInfoMessage *dim;
493 const struct ConnectInfoMessage *cim;
494 const struct InboundMessage *im;
495 const struct GNUNET_MessageHeader *imm;
496 const struct SendOkMessage *okm;
497 const struct QuotaSetMessage *qm;
498 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
499 struct GNUNET_TRANSPORT_GetHelloHandle *next_hwl;
501 struct GNUNET_PeerIdentity me;
504 uint32_t bytes_physical;
506 GNUNET_assert (NULL != h->client);
507 if (GNUNET_YES == reconnecting)
513 LOG (GNUNET_ERROR_TYPE_DEBUG,
514 "Error receiving from transport service, disconnecting temporarily.\n");
515 reconnecting = GNUNET_YES;
516 disconnect_and_schedule_reconnect (h);
519 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
520 GNUNET_TIME_UNIT_FOREVER_REL);
521 size = ntohs (msg->size);
522 switch (ntohs (msg->type))
524 case GNUNET_MESSAGE_TYPE_HELLO:
526 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) msg, &me))
531 LOG (GNUNET_ERROR_TYPE_DEBUG,
532 "Receiving (my own) `%s' message, I am `%4s'.\n", "HELLO",
534 GNUNET_free_non_null (h->my_hello);
536 if (size < sizeof (struct GNUNET_MessageHeader))
541 h->my_hello = GNUNET_malloc (size);
542 memcpy (h->my_hello, msg, size);
546 next_hwl = hwl->next;
547 hwl->rec (hwl->rec_cls,
548 (const struct GNUNET_MessageHeader *) h->my_hello);
552 case GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT:
553 if (size < sizeof (struct ConnectInfoMessage))
558 cim = (const struct ConnectInfoMessage *) msg;
560 sizeof (struct ConnectInfoMessage))
565 LOG (GNUNET_ERROR_TYPE_DEBUG,
566 "Receiving `%s' message for `%4s'.\n",
567 "CONNECT", GNUNET_i2s (&cim->id));
568 n = neighbour_find (h, &cim->id);
574 n = neighbour_add (h, &cim->id);
575 LOG (GNUNET_ERROR_TYPE_DEBUG,
576 "Receiving `%s' message for `%4s' with quota %u\n",
578 GNUNET_i2s (&cim->id),
579 ntohl (cim->quota_out.value__));
580 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, cim->quota_out);
581 if (h->nc_cb != NULL)
582 h->nc_cb (h->cls, &n->id);
584 case GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT:
585 if (size != sizeof (struct DisconnectInfoMessage))
590 dim = (const struct DisconnectInfoMessage *) msg;
591 GNUNET_break (ntohl (dim->reserved) == 0);
592 LOG (GNUNET_ERROR_TYPE_DEBUG,
593 "Receiving `%s' message for `%4s'.\n",
594 "DISCONNECT", GNUNET_i2s (&dim->peer));
595 n = neighbour_find (h, &dim->peer);
601 neighbour_delete (h, &dim->peer, n);
603 case GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK:
604 if (size != sizeof (struct SendOkMessage))
609 okm = (const struct SendOkMessage *) msg;
610 bytes_msg = ntohl (okm->bytes_msg);
611 bytes_physical = ntohl (okm->bytes_physical);
612 LOG (GNUNET_ERROR_TYPE_DEBUG,
613 "Receiving SEND_OK message, transmission %s.\n",
614 ntohl (okm->success) == GNUNET_OK ? "succeeded" : "failed");
616 n = neighbour_find (h, &okm->peer);
620 if (bytes_physical >= bytes_msg)
622 LOG (GNUNET_ERROR_TYPE_DEBUG,
623 "Overhead for %u byte message: %u\n",
624 bytes_msg, bytes_physical - bytes_msg);
625 n->traffic_overhead += bytes_physical - bytes_msg;
627 GNUNET_break (GNUNET_NO == n->is_ready);
628 n->is_ready = GNUNET_YES;
629 if ((NULL != n->th) && (NULL == n->hn))
631 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->th->timeout_task);
632 GNUNET_SCHEDULER_cancel (n->th->timeout_task);
633 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
634 /* we've been waiting for this (congestion, not quota,
635 * caused delayed transmission) */
636 n->hn = GNUNET_CONTAINER_heap_insert (h->ready_heap, n, 0);
637 schedule_transmission (h);
640 case GNUNET_MESSAGE_TYPE_TRANSPORT_RECV:
641 LOG (GNUNET_ERROR_TYPE_DEBUG,
642 "Receiving `%s' message.\n",
645 sizeof (struct InboundMessage) + sizeof (struct GNUNET_MessageHeader))
650 im = (const struct InboundMessage *) msg;
651 imm = (const struct GNUNET_MessageHeader *) &im[1];
652 if (ntohs (imm->size) + sizeof (struct InboundMessage) != size)
657 LOG (GNUNET_ERROR_TYPE_DEBUG,
658 "Received message of type %u from `%4s'.\n",
659 ntohs (imm->type), GNUNET_i2s (&im->peer));
660 n = neighbour_find (h, &im->peer);
667 h->rec (h->cls, &im->peer, imm);
669 case GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA:
670 LOG (GNUNET_ERROR_TYPE_DEBUG,
671 "Receiving `%s' message.\n", "SET_QUOTA");
672 if (size != sizeof (struct QuotaSetMessage))
677 qm = (const struct QuotaSetMessage *) msg;
678 n = neighbour_find (h, &qm->peer);
681 LOG (GNUNET_ERROR_TYPE_DEBUG,
682 "Receiving `%s' message for `%4s' with quota %u\n",
684 GNUNET_i2s (&qm->peer),
685 ntohl (qm->quota.value__));
686 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, qm->quota);
689 LOG (GNUNET_ERROR_TYPE_ERROR,
690 _("Received unexpected message of type %u in %s:%u\n"),
691 ntohs (msg->type), __FILE__, __LINE__);
699 * A transmission request could not be satisfied because of
700 * network congestion. Notify the initiator and clean up.
702 * @param cls the `struct GNUNET_TRANSPORT_TransmitHandle`
703 * @param tc scheduler context
706 timeout_request_due_to_congestion (void *cls,
707 const struct GNUNET_SCHEDULER_TaskContext *tc)
709 struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
710 struct Neighbour *n = th->neighbour;
712 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
713 GNUNET_assert (th == n->th);
714 GNUNET_assert (NULL == n->hn);
716 th->notify (th->notify_cls, 0, NULL);
722 * Transmit message(s) to service.
724 * @param cls handle to transport
725 * @param size number of bytes available in @a buf
726 * @param buf where to copy the message
727 * @return number of bytes copied to @a buf
730 transport_notify_ready (void *cls, size_t size, void *buf)
732 struct GNUNET_TRANSPORT_Handle *h = cls;
733 struct GNUNET_TRANSPORT_TransmitHandle *th;
736 struct OutboundMessage obm;
741 GNUNET_assert (NULL != h->client);
745 /* transmission failed */
746 disconnect_and_schedule_reconnect (h);
752 /* first send control messages */
753 while ((NULL != (th = h->control_head)) && (th->notify_size <= size))
755 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
756 nret = th->notify (th->notify_cls, size, &cbuf[ret]);
757 LOG (GNUNET_ERROR_TYPE_DEBUG,
758 "Added %u bytes of control message at %u\n",
765 /* then, if possible and no control messages pending, send data messages */
766 while ((NULL == h->control_head) &&
767 (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))))
769 if (GNUNET_YES != n->is_ready)
771 /* peer not ready, wait for notification! */
772 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
774 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == n->th->timeout_task);
775 n->th->timeout_task =
776 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
778 &timeout_request_due_to_congestion,
783 if (th->notify_size + sizeof (struct OutboundMessage) > size)
784 break; /* does not fit */
785 if (GNUNET_BANDWIDTH_tracker_get_delay
786 (&n->out_tracker, th->notify_size).rel_value_us > 0)
787 break; /* too early */
788 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
791 n->is_ready = GNUNET_NO;
792 GNUNET_assert (size >= sizeof (struct OutboundMessage));
794 th->notify (th->notify_cls, size - sizeof (struct OutboundMessage),
795 &cbuf[ret + sizeof (struct OutboundMessage)]);
796 GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
799 GNUNET_assert (mret + sizeof (struct OutboundMessage) <
800 GNUNET_SERVER_MAX_MESSAGE_SIZE);
801 obm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND);
802 obm.header.size = htons (mret + sizeof (struct OutboundMessage));
803 obm.priority = htonl (th->priority);
805 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
808 memcpy (&cbuf[ret], &obm, sizeof (struct OutboundMessage));
809 ret += (mret + sizeof (struct OutboundMessage));
810 size -= (mret + sizeof (struct OutboundMessage));
811 GNUNET_BANDWIDTH_tracker_consume (&n->out_tracker, mret);
815 /* if there are more pending messages, try to schedule those */
816 schedule_transmission (h);
817 LOG (GNUNET_ERROR_TYPE_DEBUG,
818 "Transmitting %u bytes to transport service\n",
825 * Schedule the task to send one message, either from the control
826 * list or the peer message queues to the service.
828 * @param cls transport service to schedule a transmission for
829 * @param tc scheduler context
832 schedule_transmission_task (void *cls,
833 const struct GNUNET_SCHEDULER_TaskContext *tc)
835 struct GNUNET_TRANSPORT_Handle *h = cls;
837 struct GNUNET_TRANSPORT_TransmitHandle *th;
840 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
841 GNUNET_assert (NULL != h->client);
842 /* destroy all requests that have timed out */
843 while ((NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))) &&
844 (0 == GNUNET_TIME_absolute_get_remaining (n->th->timeout).rel_value_us))
846 /* notify client that the request could not be satisfied within
847 * the given time constraints */
850 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
852 LOG (GNUNET_ERROR_TYPE_DEBUG,
853 "Signalling timeout for transmission to peer %s due to congestion\n",
854 GNUNET_i2s (&n->id));
855 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
860 if (NULL != h->control_head)
862 size = h->control_head->notify_size;
866 n = GNUNET_CONTAINER_heap_peek (h->ready_heap);
868 return; /* no pending messages */
869 size = n->th->notify_size + sizeof (struct OutboundMessage);
871 LOG (GNUNET_ERROR_TYPE_DEBUG, "Calling notify_transmit_ready\n");
873 GNUNET_CLIENT_notify_transmit_ready (h->client, size,
874 GNUNET_TIME_UNIT_FOREVER_REL,
875 GNUNET_NO, &transport_notify_ready,
877 GNUNET_assert (NULL != h->cth);
882 * Schedule the task to send one message, either from the control
883 * list or the peer message queues to the service.
885 * @param h transport service to schedule a transmission for
888 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h)
890 struct GNUNET_TIME_Relative delay;
893 GNUNET_assert (NULL != h->client);
894 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
896 GNUNET_SCHEDULER_cancel (h->quota_task);
897 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
899 if (NULL != h->control_head)
900 delay = GNUNET_TIME_UNIT_ZERO;
901 else if (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap)))
904 GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker,
905 n->th->notify_size + n->traffic_overhead);
906 n->traffic_overhead = 0;
909 return; /* no work to be done */
910 LOG (GNUNET_ERROR_TYPE_DEBUG,
911 "Scheduling next transmission to service in %s\n",
912 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
914 GNUNET_SCHEDULER_add_delayed (delay, &schedule_transmission_task, h);
919 * Queue control request for transmission to the transport
922 * @param h handle to the transport service
923 * @param size number of bytes to be transmitted
924 * @param notify function to call to get the content
925 * @param notify_cls closure for @a notify
926 * @return a `struct GNUNET_TRANSPORT_TransmitHandle`
928 static struct GNUNET_TRANSPORT_TransmitHandle *
929 schedule_control_transmit (struct GNUNET_TRANSPORT_Handle *h, size_t size,
930 GNUNET_CONNECTION_TransmitReadyNotify notify,
933 struct GNUNET_TRANSPORT_TransmitHandle *th;
935 LOG (GNUNET_ERROR_TYPE_DEBUG,
936 "Control transmit of %u bytes requested\n",
938 th = GNUNET_new (struct GNUNET_TRANSPORT_TransmitHandle);
940 th->notify_cls = notify_cls;
941 th->notify_size = size;
942 GNUNET_CONTAINER_DLL_insert_tail (h->control_head, h->control_tail, th);
943 schedule_transmission (h);
949 * Transmit START message to service.
952 * @param size number of bytes available in @a buf
953 * @param buf where to copy the message
954 * @return number of bytes copied to @a buf
957 send_start (void *cls, size_t size, void *buf)
959 struct GNUNET_TRANSPORT_Handle *h = cls;
960 struct StartMessage s;
965 /* Can only be shutdown, just give up */
966 LOG (GNUNET_ERROR_TYPE_DEBUG,
967 "Shutdown while trying to transmit `%s' request.\n",
971 LOG (GNUNET_ERROR_TYPE_DEBUG,
972 "Transmitting `%s' request.\n",
974 GNUNET_assert (size >= sizeof (struct StartMessage));
975 s.header.size = htons (sizeof (struct StartMessage));
976 s.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
982 s.options = htonl (options);
984 memcpy (buf, &s, sizeof (struct StartMessage));
985 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
986 GNUNET_TIME_UNIT_FOREVER_REL);
987 return sizeof (struct StartMessage);
992 * Try again to connect to transport service.
994 * @param cls the handle to the transport service
995 * @param tc scheduler context
998 reconnect (void *cls,
999 const struct GNUNET_SCHEDULER_TaskContext *tc)
1001 struct GNUNET_TRANSPORT_Handle *h = cls;
1003 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1004 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1006 /* shutdown, just give up */
1009 LOG (GNUNET_ERROR_TYPE_DEBUG,
1010 "Connecting to transport service.\n");
1011 GNUNET_assert (NULL == h->client);
1012 GNUNET_assert (NULL == h->control_head);
1013 GNUNET_assert (NULL == h->control_tail);
1014 reconnecting = GNUNET_NO;
1015 h->client = GNUNET_CLIENT_connect ("transport", h->cfg);
1017 GNUNET_assert (NULL != h->client);
1018 schedule_control_transmit (h, sizeof (struct StartMessage), &send_start, h);
1023 * Function that will schedule the job that will try
1024 * to connect us again to the client.
1026 * @param h transport service to reconnect
1029 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
1031 struct GNUNET_TRANSPORT_TransmitHandle *th;
1033 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
1036 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
1039 if (NULL != h->client)
1041 GNUNET_CLIENT_disconnect (h->client);
1043 /* LOG (GNUNET_ERROR_TYPE_ERROR,
1044 "Client disconnect done \n");*/
1046 /* Forget about all neighbours that we used to be connected to */
1047 GNUNET_CONTAINER_multipeermap_iterate (h->neighbours,
1048 &neighbour_delete, h);
1049 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
1051 GNUNET_SCHEDULER_cancel (h->quota_task);
1052 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
1054 while ((NULL != (th = h->control_head)))
1056 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
1057 th->notify (th->notify_cls, 0, NULL);
1060 LOG (GNUNET_ERROR_TYPE_DEBUG,
1061 "Scheduling task to reconnect to transport service in %s.\n",
1062 GNUNET_STRINGS_relative_time_to_string(h->reconnect_delay, GNUNET_YES));
1064 GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
1065 h->reconnect_delay = GNUNET_TIME_STD_BACKOFF (h->reconnect_delay);
1070 * Cancel control request for transmission to the transport service.
1072 * @param th handle to the transport service
1073 * @param tth transmit handle to cancel
1076 cancel_control_transmit (struct GNUNET_TRANSPORT_Handle *th,
1077 struct GNUNET_TRANSPORT_TransmitHandle *tth)
1079 LOG (GNUNET_ERROR_TYPE_DEBUG,
1080 "Canceling transmit of contral transmission requested\n");
1081 GNUNET_CONTAINER_DLL_remove (th->control_head, th->control_tail, tth);
1088 * Send REQUEST_CONNECT message to the service.
1090 * @param cls the `struct GNUNET_PeerIdentity`
1091 * @param size number of bytes available in @a buf
1092 * @param buf where to copy the message
1093 * @return number of bytes copied to @a buf
1096 send_try_connect (void *cls, size_t size, void *buf)
1098 struct GNUNET_TRANSPORT_TryConnectHandle *tch = cls;
1099 struct TransportRequestConnectMessage msg;
1103 if (NULL != tch->cb)
1104 tch->cb (tch->cb_cls, GNUNET_SYSERR);
1105 GNUNET_CONTAINER_DLL_remove (tch->th->tc_head, tch->th->tc_tail, tch);
1106 LOG (GNUNET_ERROR_TYPE_DEBUG,
1107 "Discarding `%s' request to `%4s' due to error in transport service connection.\n",
1109 GNUNET_i2s (&tch->pid));
1113 LOG (GNUNET_ERROR_TYPE_DEBUG,
1114 "Transmitting `%s' request with respect to `%4s'.\n",
1116 GNUNET_i2s (&tch->pid));
1117 GNUNET_assert (size >= sizeof (struct TransportRequestConnectMessage));
1118 msg.header.size = htons (sizeof (struct TransportRequestConnectMessage));
1119 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT);
1120 msg.reserved = htonl (0);
1121 msg.peer = tch->pid;
1122 memcpy (buf, &msg, sizeof (msg));
1123 if (NULL != tch->cb)
1124 tch->cb (tch->cb_cls, GNUNET_OK);
1125 GNUNET_CONTAINER_DLL_remove (tch->th->tc_head, tch->th->tc_tail, tch);
1127 return sizeof (struct TransportRequestConnectMessage);
1131 * Ask the transport service to establish a connection to
1134 * @param handle connection to transport service
1135 * @param target who we should try to connect to
1136 * @param cb callback to be called when request was transmitted to transport
1138 * @param cb_cls closure for the callback
1139 * @return a `struct GNUNET_TRANSPORT_TryConnectHandle` handle or
1140 * NULL on failure (cb will not be called)
1142 struct GNUNET_TRANSPORT_TryConnectHandle *
1143 GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
1144 const struct GNUNET_PeerIdentity *target,
1145 GNUNET_TRANSPORT_TryConnectCallback cb,
1148 struct GNUNET_TRANSPORT_TryConnectHandle *tch = NULL;
1150 if (NULL == handle->client)
1152 tch = GNUNET_new (struct GNUNET_TRANSPORT_TryConnectHandle);
1154 tch->pid = *(target);
1156 tch->cb_cls = cb_cls;
1157 tch->tth = schedule_control_transmit (handle,
1158 sizeof (struct TransportRequestConnectMessage),
1159 &send_try_connect, tch);
1160 GNUNET_CONTAINER_DLL_insert(handle->tc_head, handle->tc_tail, tch);
1166 * Cancel the request to transport to try a connect
1167 * Callback will not be called
1169 * @param tch the handle to cancel
1172 GNUNET_TRANSPORT_try_connect_cancel (struct GNUNET_TRANSPORT_TryConnectHandle *tch)
1174 struct GNUNET_TRANSPORT_Handle *th;
1177 cancel_control_transmit (th, tch->tth);
1178 GNUNET_CONTAINER_DLL_remove (th->tc_head, th->tc_tail, tch);
1183 * Send HELLO message to the service.
1185 * @param cls the HELLO message to send
1186 * @param size number of bytes available in @a buf
1187 * @param buf where to copy the message
1188 * @return number of bytes copied to @a buf
1191 send_hello (void *cls, size_t size, void *buf)
1193 struct GNUNET_TRANSPORT_OfferHelloHandle *ohh = cls;
1194 struct GNUNET_MessageHeader *msg = ohh->msg;
1196 struct GNUNET_SCHEDULER_TaskContext tc;
1198 tc.read_ready = NULL;
1199 tc.write_ready = NULL;
1200 tc.reason = GNUNET_SCHEDULER_REASON_TIMEOUT;
1203 LOG (GNUNET_ERROR_TYPE_DEBUG,
1204 "Timeout while trying to transmit `%s' request.\n",
1206 if (NULL != ohh->cont)
1207 ohh->cont (ohh->cls, &tc);
1209 GNUNET_CONTAINER_DLL_remove (ohh->th->oh_head, ohh->th->oh_tail, ohh);
1213 LOG (GNUNET_ERROR_TYPE_DEBUG,
1214 "Transmitting `%s' request.\n",
1216 ssize = ntohs (msg->size);
1217 GNUNET_assert (size >= ssize);
1218 memcpy (buf, msg, ssize);
1220 tc.reason = GNUNET_SCHEDULER_REASON_READ_READY;
1221 if (NULL != ohh->cont)
1222 ohh->cont (ohh->cls, &tc);
1223 GNUNET_CONTAINER_DLL_remove (ohh->th->oh_head, ohh->th->oh_tail, ohh);
1230 * Send traffic metric message to the service.
1232 * @param cls the message to send
1233 * @param size number of bytes available in @a buf
1234 * @param buf where to copy the message
1235 * @return number of bytes copied to @a buf
1238 send_metric (void *cls, size_t size, void *buf)
1240 struct TrafficMetricMessage *msg = cls;
1245 LOG (GNUNET_ERROR_TYPE_DEBUG,
1246 "Timeout while trying to transmit `%s' request.\n",
1251 LOG (GNUNET_ERROR_TYPE_DEBUG,
1252 "Transmitting `%s' request.\n",
1254 ssize = ntohs (msg->header.size);
1255 GNUNET_assert (size >= ssize);
1256 memcpy (buf, msg, ssize);
1263 * Set transport metrics for a peer and a direction
1265 * @param handle transport handle
1266 * @param peer the peer to set the metric for
1267 * @param inbound set inbound direction (#GNUNET_YES or #GNUNET_NO)
1268 * @param outbound set outbound direction (#GNUNET_YES or #GNUNET_NO)
1269 * @param ats the metric as ATS information
1270 * @param ats_count the number of metrics
1272 * Supported ATS values:
1273 * #GNUNET_ATS_QUALITY_NET_DELAY (value in ms)
1274 * #GNUNET_ATS_QUALITY_NET_DISTANCE (value in count(hops))
1277 * To enforce a delay of 10 ms for peer p1 in sending direction use:
1279 * struct GNUNET_ATS_Information ats;
1280 * ats.type = ntohl (GNUNET_ATS_QUALITY_NET_DELAY);
1281 * ats.value = ntohl (10);
1282 * GNUNET_TRANSPORT_set_traffic_metric (th, p1, TM_SEND, &ats, 1);
1285 * Delay restrictions in receiving direction will be enforced with
1289 GNUNET_TRANSPORT_set_traffic_metric (struct GNUNET_TRANSPORT_Handle *handle,
1290 const struct GNUNET_PeerIdentity *peer,
1293 const struct GNUNET_ATS_Information *ats,
1296 struct TrafficMetricMessage *msg;
1298 GNUNET_assert ((outbound == GNUNET_YES) || (outbound == GNUNET_NO));
1299 GNUNET_assert ((inbound == GNUNET_YES) || (inbound == GNUNET_NO));
1300 if ((GNUNET_NO == inbound) && (GNUNET_NO == outbound))
1305 size_t len = sizeof (struct TrafficMetricMessage) +
1306 ats_count * sizeof (struct GNUNET_ATS_Information);
1308 msg = GNUNET_malloc (len);
1309 msg->header.size = htons (len);
1310 msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TRAFFIC_METRIC);
1311 msg->direction = htons (0 + outbound + 2 * inbound);
1312 msg->ats_count = htons (ats_count);
1313 msg->peer = (*peer);
1314 memcpy (&msg[1], ats, ats_count * sizeof (struct GNUNET_ATS_Information));
1315 schedule_control_transmit (handle, len, &send_metric, msg);
1321 * Offer the transport service the HELLO of another peer. Note that
1322 * the transport service may just ignore this message if the HELLO is
1323 * malformed or useless due to our local configuration.
1325 * @param handle connection to transport service
1326 * @param hello the hello message
1327 * @param cont continuation to call when HELLO has been sent,
1328 * tc reason #GNUNET_SCHEDULER_REASON_TIMEOUT for fail
1329 * tc reasong #GNUNET_SCHEDULER_REASON_READ_READY for success
1330 * @param cls closure for continuation
1331 * @return a `struct GNUNET_TRANSPORT_OfferHelloHandle` handle or NULL on failure,
1332 * in case of failure cont will not be called
1335 struct GNUNET_TRANSPORT_OfferHelloHandle *
1336 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
1337 const struct GNUNET_MessageHeader *hello,
1338 GNUNET_SCHEDULER_Task cont, void *cls)
1340 struct GNUNET_TRANSPORT_OfferHelloHandle *ohh;
1341 struct GNUNET_MessageHeader *msg;
1342 struct GNUNET_PeerIdentity peer;
1345 if (NULL == handle->client)
1347 GNUNET_break (ntohs (hello->type) == GNUNET_MESSAGE_TYPE_HELLO);
1348 size = ntohs (hello->size);
1349 GNUNET_break (size >= sizeof (struct GNUNET_MessageHeader));
1351 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hello, &peer))
1357 msg = GNUNET_malloc (size);
1358 memcpy (msg, hello, size);
1359 LOG (GNUNET_ERROR_TYPE_DEBUG,
1360 "Offering `%s' message of `%4s' to transport for validation.\n", "HELLO",
1361 GNUNET_i2s (&peer));
1363 ohh = GNUNET_new (struct GNUNET_TRANSPORT_OfferHelloHandle);
1368 ohh->tth = schedule_control_transmit (handle, size, &send_hello, ohh);
1369 GNUNET_CONTAINER_DLL_insert (handle->oh_head, handle->oh_tail, ohh);
1375 * Cancel the request to transport to offer the HELLO message
1377 * @param ohh the GNUNET_TRANSPORT_OfferHelloHandle to cancel
1380 GNUNET_TRANSPORT_offer_hello_cancel (struct GNUNET_TRANSPORT_OfferHelloHandle *ohh)
1382 struct GNUNET_TRANSPORT_Handle *th = ohh->th;
1384 cancel_control_transmit (ohh->th, ohh->tth);
1385 GNUNET_CONTAINER_DLL_remove (th->oh_head, th->oh_tail, ohh);
1386 GNUNET_free (ohh->msg);
1392 * Checks if a given peer is connected to us
1394 * @param handle connection to transport service
1395 * @param peer the peer to check
1396 * @return #GNUNET_YES (connected) or #GNUNET_NO (disconnected)
1399 GNUNET_TRANSPORT_check_peer_connected (struct GNUNET_TRANSPORT_Handle *handle,
1400 const struct GNUNET_PeerIdentity *peer)
1403 GNUNET_CONTAINER_multipeermap_contains (handle->neighbours,
1411 * Task to call the HelloUpdateCallback of the GetHelloHandle
1413 * @param cls the `struct GNUNET_TRANSPORT_GetHelloHandle`
1414 * @param tc the scheduler task context
1417 call_hello_update_cb_async (void *cls,
1418 const struct GNUNET_SCHEDULER_TaskContext *tc)
1420 struct GNUNET_TRANSPORT_GetHelloHandle *ghh = cls;
1422 GNUNET_assert (NULL != ghh->handle->my_hello);
1423 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != ghh->notify_task);
1424 ghh->notify_task = GNUNET_SCHEDULER_NO_TASK;
1425 ghh->rec (ghh->rec_cls,
1426 (const struct GNUNET_MessageHeader *) ghh->handle->my_hello);
1431 * Obtain the HELLO message for this peer. The callback given in this function
1432 * is never called synchronously.
1434 * @param handle connection to transport service
1435 * @param rec function to call with the HELLO, sender will be our peer
1436 * identity; message and sender will be NULL on timeout
1437 * (handshake with transport service pending/failed).
1438 * cost estimate will be 0.
1439 * @param rec_cls closure for @a rec
1440 * @return handle to cancel the operation
1442 struct GNUNET_TRANSPORT_GetHelloHandle *
1443 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
1444 GNUNET_TRANSPORT_HelloUpdateCallback rec,
1447 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
1449 hwl = GNUNET_new (struct GNUNET_TRANSPORT_GetHelloHandle);
1451 hwl->rec_cls = rec_cls;
1452 hwl->handle = handle;
1453 GNUNET_CONTAINER_DLL_insert (handle->hwl_head, handle->hwl_tail, hwl);
1454 if (handle->my_hello != NULL)
1455 hwl->notify_task = GNUNET_SCHEDULER_add_now (&call_hello_update_cb_async,
1462 * Stop receiving updates about changes to our HELLO message.
1464 * @param ghh handle to cancel
1467 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_GetHelloHandle *ghh)
1469 struct GNUNET_TRANSPORT_Handle *handle = ghh->handle;
1471 if (GNUNET_SCHEDULER_NO_TASK != ghh->notify_task)
1472 GNUNET_SCHEDULER_cancel (ghh->notify_task);
1473 GNUNET_CONTAINER_DLL_remove (handle->hwl_head, handle->hwl_tail, ghh);
1479 * Connect to the transport service. Note that the connection may
1480 * complete (or fail) asynchronously.
1482 * @param cfg configuration to use
1483 * @param self our own identity (API should check that it matches
1484 * the identity found by transport), or NULL (no check)
1485 * @param cls closure for the callbacks
1486 * @param rec receive function to call
1487 * @param nc function to call on connect events
1488 * @param nd function to call on disconnect events
1490 struct GNUNET_TRANSPORT_Handle *
1491 GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1492 const struct GNUNET_PeerIdentity *self, void *cls,
1493 GNUNET_TRANSPORT_ReceiveCallback rec,
1494 GNUNET_TRANSPORT_NotifyConnect nc,
1495 GNUNET_TRANSPORT_NotifyDisconnect nd)
1497 struct GNUNET_TRANSPORT_Handle *ret;
1499 ret = GNUNET_new (struct GNUNET_TRANSPORT_Handle);
1503 ret->check_self = GNUNET_YES;
1510 ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
1511 LOG (GNUNET_ERROR_TYPE_DEBUG,
1512 "Connecting to transport service.\n");
1513 ret->client = GNUNET_CLIENT_connect ("transport", cfg);
1514 if (NULL == ret->client)
1520 GNUNET_CONTAINER_multipeermap_create (STARTING_NEIGHBOURS_SIZE,
1523 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1524 schedule_control_transmit (ret, sizeof (struct StartMessage),
1531 * Disconnect from the transport service.
1533 * @param handle handle to the service as returned from #GNUNET_TRANSPORT_connect()
1536 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
1538 LOG (GNUNET_ERROR_TYPE_DEBUG,
1539 "Transport disconnect called!\n");
1540 /* this disconnects all neighbours... */
1541 if (handle->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1542 disconnect_and_schedule_reconnect (handle);
1543 /* and now we stop trying to connect again... */
1544 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1546 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1547 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1549 GNUNET_CONTAINER_multipeermap_destroy (handle->neighbours);
1550 handle->neighbours = NULL;
1551 if (handle->quota_task != GNUNET_SCHEDULER_NO_TASK)
1553 GNUNET_SCHEDULER_cancel (handle->quota_task);
1554 handle->quota_task = GNUNET_SCHEDULER_NO_TASK;
1556 GNUNET_free_non_null (handle->my_hello);
1557 handle->my_hello = NULL;
1558 GNUNET_assert (handle->tc_head == NULL);
1559 GNUNET_assert (handle->tc_tail == NULL);
1560 GNUNET_assert (handle->hwl_head == NULL);
1561 GNUNET_assert (handle->hwl_tail == NULL);
1562 GNUNET_CONTAINER_heap_destroy (handle->ready_heap);
1563 handle->ready_heap = NULL;
1564 GNUNET_free (handle);
1569 * Check if we could queue a message of the given size for
1570 * transmission. The transport service will take both its
1571 * internal buffers and bandwidth limits imposed by the
1572 * other peer into consideration when answering this query.
1574 * @param handle connection to transport service
1575 * @param target who should receive the message
1576 * @param size how big is the message we want to transmit?
1577 * @param priority how important is the message?
1578 * @param timeout after how long should we give up (and call
1579 * notify with buf NULL and size 0)?
1580 * @param notify function to call when we are ready to
1581 * send such a message
1582 * @param notify_cls closure for @a notify
1583 * @return NULL if someone else is already waiting to be notified
1584 * non-NULL if the notify callback was queued (can be used to cancel
1585 * using #GNUNET_TRANSPORT_notify_transmit_ready_cancel)
1587 struct GNUNET_TRANSPORT_TransmitHandle *
1588 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
1589 const struct GNUNET_PeerIdentity *target,
1590 size_t size, uint32_t priority,
1591 struct GNUNET_TIME_Relative timeout,
1592 GNUNET_CONNECTION_TransmitReadyNotify notify,
1595 struct Neighbour *n;
1596 struct GNUNET_TRANSPORT_TransmitHandle *th;
1597 struct GNUNET_TIME_Relative delay;
1599 n = neighbour_find (handle, target);
1602 /* use GNUNET_TRANSPORT_try_connect first, only use this function
1603 * once a connection has been established */
1609 /* attempt to send two messages at the same time to the same peer */
1613 GNUNET_assert (NULL == n->hn);
1614 th = GNUNET_new (struct GNUNET_TRANSPORT_TransmitHandle);
1616 th->notify = notify;
1617 th->notify_cls = notify_cls;
1618 th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1619 th->notify_size = size;
1620 th->priority = priority;
1622 /* calculate when our transmission should be ready */
1623 delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, size + n->traffic_overhead);
1624 n->traffic_overhead = 0;
1625 if (delay.rel_value_us > timeout.rel_value_us)
1626 delay.rel_value_us = 0; /* notify immediately (with failure) */
1627 LOG (GNUNET_ERROR_TYPE_DEBUG,
1628 "Bandwidth tracker allows next transmission to peer %s in %s\n",
1629 GNUNET_i2s (target),
1630 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
1631 n->hn = GNUNET_CONTAINER_heap_insert (handle->ready_heap, n, delay.rel_value_us);
1632 schedule_transmission (handle);
1638 * Cancel the specified transmission-ready notification.
1640 * @param th handle returned from #GNUNET_TRANSPORT_notify_transmit_ready()
1643 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct GNUNET_TRANSPORT_TransmitHandle *th)
1645 struct Neighbour *n;
1647 GNUNET_assert (NULL == th->next);
1648 GNUNET_assert (NULL == th->prev);
1650 GNUNET_assert (th == n->th);
1654 GNUNET_CONTAINER_heap_remove_node (n->hn);
1659 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != th->timeout_task);
1660 GNUNET_SCHEDULER_cancel (th->timeout_task);
1661 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1667 /* end of transport_api.c */