2 This file is part of GNUnet.
3 (C) 2009, 2010, 2011 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.
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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
27 * - adjust testcases to use new 'try connect' style (should be easy, breaks API compatibility!)
28 * - adjust core service to use new 'try connect' style (should be MUCH nicer there as well!)
32 #include "gnunet_constants.h"
33 #include "gnunet_bandwidth_lib.h"
34 #include "gnunet_client_lib.h"
35 #include "gnunet_constants.h"
36 #include "gnunet_container_lib.h"
37 #include "gnunet_arm_service.h"
38 #include "gnunet_hello_lib.h"
39 #include "gnunet_protocols.h"
40 #include "gnunet_server_lib.h"
41 #include "gnunet_time_lib.h"
42 #include "gnunet_transport_service.h"
43 #include "transport.h"
45 #define LOG(kind,...) GNUNET_log_from (kind, "transport-api",__VA_ARGS__)
48 * How large to start with for the hashmap of neighbours.
50 #define STARTING_NEIGHBOURS_SIZE 16
53 * Handle for a message that should be transmitted to the service.
54 * Used for both control messages and normal messages.
56 struct GNUNET_TRANSPORT_TransmitHandle
60 * We keep all requests in a DLL.
62 struct GNUNET_TRANSPORT_TransmitHandle *next;
65 * We keep all requests in a DLL.
67 struct GNUNET_TRANSPORT_TransmitHandle *prev;
70 * Neighbour for this handle, NULL for control messages.
72 struct Neighbour *neighbour;
75 * Function to call when notify_size bytes are available
78 GNUNET_CONNECTION_TransmitReadyNotify notify;
86 * Timeout for this request, 0 for control messages.
88 struct GNUNET_TIME_Absolute timeout;
91 * Task to trigger request timeout if the request is stalled due to
94 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
97 * How many bytes is our notify callback waiting for?
102 * How important is this message? Not used for control messages.
110 * Entry in hash table of all of our current neighbours.
115 * Overall transport handle.
117 struct GNUNET_TRANSPORT_Handle *h;
120 * Active transmit handle or NULL.
122 struct GNUNET_TRANSPORT_TransmitHandle *th;
125 * Identity of this neighbour.
127 struct GNUNET_PeerIdentity id;
130 * Outbound bandwidh tracker.
132 struct GNUNET_BANDWIDTH_Tracker out_tracker;
135 * Entry in our readyness heap (which is sorted by 'next_ready'
136 * value). NULL if there is no pending transmission request for
137 * this neighbour or if we're waiting for 'is_ready' to become
138 * true AFTER the 'out_tracker' suggested that this peer's quota
139 * has been satisfied (so once 'is_ready' goes to GNUNET_YES,
140 * we should immediately go back into the heap).
142 struct GNUNET_CONTAINER_HeapNode *hn;
145 * Is this peer currently ready to receive a message?
150 * Sending consumed more bytes on wire than payload was announced
151 * This overhead is added to the delay of next sending operation
153 size_t traffic_overhead;
158 * Linked list of functions to call whenever our HELLO is updated.
160 struct GNUNET_TRANSPORT_GetHelloHandle
164 * This is a doubly linked list.
166 struct GNUNET_TRANSPORT_GetHelloHandle *next;
169 * This is a doubly linked list.
171 struct GNUNET_TRANSPORT_GetHelloHandle *prev;
176 struct GNUNET_TRANSPORT_Handle *handle;
179 * Callback to call once we got our HELLO.
181 GNUNET_TRANSPORT_HelloUpdateCallback rec;
184 * Task for calling the HelloUpdateCallback when we already have a HELLO
186 GNUNET_SCHEDULER_TaskIdentifier notify_task;
196 * Linked list for all try-connect requests
198 struct GNUNET_TRANSPORT_TryConnectHandle
200 struct GNUNET_TRANSPORT_TryConnectHandle *prev;
201 struct GNUNET_TRANSPORT_TryConnectHandle *next;
203 struct GNUNET_PeerIdentity pid;
205 struct GNUNET_TRANSPORT_Handle *th;
206 struct GNUNET_TRANSPORT_TransmitHandle *tth;
207 GNUNET_TRANSPORT_TryConnectCallback cb;
213 * Linked list for all try-connect requests
215 struct GNUNET_TRANSPORT_OfferHelloHandle
217 struct GNUNET_TRANSPORT_OfferHelloHandle *prev;
218 struct GNUNET_TRANSPORT_OfferHelloHandle *next;
220 struct GNUNET_TRANSPORT_Handle *th;
222 struct GNUNET_TRANSPORT_TransmitHandle *tth;
223 GNUNET_SCHEDULER_Task cont;
227 struct GNUNET_MessageHeader *msg;
232 * Handle for the transport service (includes all of the
233 * state for the transport service).
235 struct GNUNET_TRANSPORT_Handle
239 * Closure for the callbacks.
244 * Function to call for received data.
246 GNUNET_TRANSPORT_ReceiveCallback rec;
249 * function to call on connect events
251 GNUNET_TRANSPORT_NotifyConnect nc_cb;
254 * function to call on disconnect events
256 GNUNET_TRANSPORT_NotifyDisconnect nd_cb;
259 * Head of DLL of control messages.
261 struct GNUNET_TRANSPORT_TransmitHandle *control_head;
264 * Tail of DLL of control messages.
266 struct GNUNET_TRANSPORT_TransmitHandle *control_tail;
269 * The current HELLO message for this peer. Updated
270 * whenever transports change their addresses.
272 struct GNUNET_HELLO_Message *my_hello;
275 * My client connection to the transport service.
277 struct GNUNET_CLIENT_Connection *client;
280 * Handle to our registration with the client for notification.
282 struct GNUNET_CLIENT_TransmitHandle *cth;
285 * Linked list of pending requests for our HELLO.
287 struct GNUNET_TRANSPORT_GetHelloHandle *hwl_head;
290 * Linked list of pending requests for our HELLO.
292 struct GNUNET_TRANSPORT_GetHelloHandle *hwl_tail;
295 * Linked list of pending try connect requests head
297 struct GNUNET_TRANSPORT_TryConnectHandle *tc_head;
300 * Linked list of pending try connect requests tail
302 struct GNUNET_TRANSPORT_TryConnectHandle *tc_tail;
305 * Linked list of pending offer HELLO requests head
307 struct GNUNET_TRANSPORT_OfferHelloHandle *oh_head;
310 * Linked list of pending offer HELLO requests tail
312 struct GNUNET_TRANSPORT_OfferHelloHandle *oh_tail;
317 const struct GNUNET_CONFIGURATION_Handle *cfg;
320 * Hash map of the current connected neighbours of this peer.
321 * Maps peer identities to 'struct Neighbour' entries.
323 struct GNUNET_CONTAINER_MultiHashMap *neighbours;
326 * Heap sorting peers with pending messages by the timestamps that
327 * specify when we could next send a message to the respective peer.
328 * Excludes control messages (which can always go out immediately).
329 * Maps time stamps to 'struct Neighbour' entries.
331 struct GNUNET_CONTAINER_Heap *ready_heap;
334 * Peer identity as assumed by this process, or all zeros.
336 struct GNUNET_PeerIdentity self;
339 * ID of the task trying to reconnect to the service.
341 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
344 * ID of the task trying to trigger transmission for a peer while
345 * maintaining bandwidth quotas. In use if there are no control
346 * messages and the smallest entry in the 'ready_heap' has a time
347 * stamp in the future.
349 GNUNET_SCHEDULER_TaskIdentifier quota_task;
352 * Delay until we try to reconnect.
354 struct GNUNET_TIME_Relative reconnect_delay;
357 * Should we check that 'self' matches what the service thinks?
358 * (if GNUNET_NO, then 'self' is all zeros!).
363 * Reconnect in progress
371 * Schedule the task to send one message, either from the control
372 * list or the peer message queues to the service.
374 * @param h transport service to schedule a transmission for
377 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h);
381 * Function that will schedule the job that will try
382 * to connect us again to the client.
384 * @param h transport service to reconnect
387 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h);
391 * Get the neighbour list entry for the given peer
393 * @param h our context
394 * @param peer peer to look up
395 * @return NULL if no such peer entry exists
397 static struct Neighbour *
398 neighbour_find (struct GNUNET_TRANSPORT_Handle *h,
399 const struct GNUNET_PeerIdentity *peer)
401 return GNUNET_CONTAINER_multihashmap_get (h->neighbours, &peer->hashPubKey);
406 * Add neighbour to our list
408 * @return NULL if this API is currently disconnecting from the service
410 static struct Neighbour *
411 neighbour_add (struct GNUNET_TRANSPORT_Handle *h,
412 const struct GNUNET_PeerIdentity *pid)
416 LOG (GNUNET_ERROR_TYPE_DEBUG, "Creating entry for neighbour `%4s'.\n",
418 n = GNUNET_malloc (sizeof (struct Neighbour));
421 n->is_ready = GNUNET_YES;
422 n->traffic_overhead = 0;
423 GNUNET_BANDWIDTH_tracker_init (&n->out_tracker,
424 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
425 MAX_BANDWIDTH_CARRY_S);
426 GNUNET_assert (GNUNET_OK ==
427 GNUNET_CONTAINER_multihashmap_put (h->neighbours,
428 &n->id.hashPubKey, n,
429 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
435 * Iterator over hash map entries, for deleting state of a neighbour.
437 * @param cls the 'struct GNUNET_TRANSPORT_Handle*'
438 * @param key peer identity
439 * @param value value in the hash map, the neighbour entry to delete
440 * @return GNUNET_YES if we should continue to
445 neighbour_delete (void *cls, const struct GNUNET_HashCode * key, void *value)
447 struct GNUNET_TRANSPORT_Handle *handle = cls;
448 struct Neighbour *n = value;
450 if (NULL != handle->nd_cb)
451 handle->nd_cb (handle->cls, &n->id);
452 GNUNET_assert (NULL == n->th);
453 GNUNET_assert (NULL == n->hn);
454 GNUNET_assert (GNUNET_YES ==
455 GNUNET_CONTAINER_multihashmap_remove (handle->neighbours, key,
463 * Function we use for handling incoming messages.
465 * @param cls closure (struct GNUNET_TRANSPORT_Handle *)
466 * @param msg message received, NULL on timeout or fatal error
469 demultiplexer (void *cls, const struct GNUNET_MessageHeader *msg)
471 struct GNUNET_TRANSPORT_Handle *h = cls;
472 const struct DisconnectInfoMessage *dim;
473 const struct ConnectInfoMessage *cim;
474 const struct InboundMessage *im;
475 const struct GNUNET_MessageHeader *imm;
476 const struct SendOkMessage *okm;
477 const struct QuotaSetMessage *qm;
478 const struct GNUNET_ATS_Information *ats;
479 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
480 struct GNUNET_TRANSPORT_GetHelloHandle *next_hwl;
482 struct GNUNET_PeerIdentity me;
486 uint32_t bytes_physical;
488 GNUNET_assert (h->client != NULL);
491 LOG (GNUNET_ERROR_TYPE_DEBUG,
492 "Error receiving from transport service, disconnecting temporarily.\n");
493 disconnect_and_schedule_reconnect (h);
496 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
497 GNUNET_TIME_UNIT_FOREVER_REL);
498 size = ntohs (msg->size);
499 switch (ntohs (msg->type))
501 case GNUNET_MESSAGE_TYPE_HELLO:
503 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) msg, &me))
508 LOG (GNUNET_ERROR_TYPE_DEBUG,
509 "Receiving (my own) `%s' message, I am `%4s'.\n", "HELLO",
511 GNUNET_free_non_null (h->my_hello);
513 if (size < sizeof (struct GNUNET_MessageHeader))
518 h->my_hello = GNUNET_malloc (size);
519 memcpy (h->my_hello, msg, size);
523 next_hwl = hwl->next;
524 hwl->rec (hwl->rec_cls,
525 (const struct GNUNET_MessageHeader *) h->my_hello);
529 case GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT:
530 if (size < sizeof (struct ConnectInfoMessage))
535 cim = (const struct ConnectInfoMessage *) msg;
536 ats_count = ntohl (cim->ats_count);
538 sizeof (struct ConnectInfoMessage) +
539 ats_count * sizeof (struct GNUNET_ATS_Information))
544 ats = (const struct GNUNET_ATS_Information *) &cim[1];
545 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s'.\n",
546 "CONNECT", GNUNET_i2s (&cim->id));
547 n = neighbour_find (h, &cim->id);
553 n = neighbour_add (h, &cim->id);
554 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s' with quota %u\n",
555 "CONNECT", GNUNET_i2s (&cim->id), ntohl (cim->quota_out.value__));
556 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, cim->quota_out);
557 if (h->nc_cb != NULL)
558 h->nc_cb (h->cls, &n->id, ats, ats_count);
560 case GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT:
561 if (size != sizeof (struct DisconnectInfoMessage))
566 dim = (const struct DisconnectInfoMessage *) msg;
567 GNUNET_break (ntohl (dim->reserved) == 0);
568 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s'.\n",
569 "DISCONNECT", GNUNET_i2s (&dim->peer));
570 n = neighbour_find (h, &dim->peer);
576 neighbour_delete (h, &dim->peer.hashPubKey, n);
578 case GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK:
579 if (size != sizeof (struct SendOkMessage))
584 okm = (const struct SendOkMessage *) msg;
585 bytes_msg = ntohl (okm->bytes_msg);
586 bytes_physical = ntohl (okm->bytes_physical);
587 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message, transmission %s.\n",
588 "SEND_OK", ntohl (okm->success) == GNUNET_OK ? "succeeded" : "failed");
590 n = neighbour_find (h, &okm->peer);
594 if (bytes_physical >= bytes_msg)
596 LOG (GNUNET_ERROR_TYPE_DEBUG, "Overhead for %u byte message: %u \n",
597 bytes_msg, bytes_physical - bytes_msg);
598 n->traffic_overhead += bytes_physical - bytes_msg;
600 GNUNET_break (GNUNET_NO == n->is_ready);
601 n->is_ready = GNUNET_YES;
602 if ((n->th != NULL) && (n->hn == NULL))
604 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->th->timeout_task);
605 GNUNET_SCHEDULER_cancel (n->th->timeout_task);
606 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
607 /* we've been waiting for this (congestion, not quota,
608 * caused delayed transmission) */
609 n->hn = GNUNET_CONTAINER_heap_insert (h->ready_heap, n, 0);
610 schedule_transmission (h);
613 case GNUNET_MESSAGE_TYPE_TRANSPORT_RECV:
614 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message.\n", "RECV");
616 sizeof (struct InboundMessage) + sizeof (struct GNUNET_MessageHeader))
621 im = (const struct InboundMessage *) msg;
622 ats_count = ntohl (im->ats_count);
623 ats = (const struct GNUNET_ATS_Information *) &im[1];
624 imm = (const struct GNUNET_MessageHeader *) &ats[ats_count];
625 if (ntohs (imm->size) + sizeof (struct InboundMessage) +
626 ats_count * sizeof (struct GNUNET_ATS_Information) != size)
631 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received message of type %u from `%4s'.\n",
632 ntohs (imm->type), GNUNET_i2s (&im->peer));
633 n = neighbour_find (h, &im->peer);
640 h->rec (h->cls, &im->peer, imm, ats, ats_count);
642 case GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA:
643 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message.\n", "SET_QUOTA");
644 if (size != sizeof (struct QuotaSetMessage))
649 qm = (const struct QuotaSetMessage *) msg;
650 n = neighbour_find (h, &qm->peer);
653 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s' with quota %u\n",
654 "SET_QUOTA", GNUNET_i2s (&qm->peer), ntohl (qm->quota.value__));
655 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, qm->quota);
658 LOG (GNUNET_ERROR_TYPE_ERROR,
659 _("Received unexpected message of type %u in %s:%u\n"),
660 ntohs (msg->type), __FILE__, __LINE__);
668 * A transmission request could not be satisfied because of
669 * network congestion. Notify the initiator and clean up.
671 * @param cls the 'struct GNUNET_TRANSPORT_TransmitHandle'
672 * @param tc scheduler context
675 timeout_request_due_to_congestion (void *cls,
676 const struct GNUNET_SCHEDULER_TaskContext
679 struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
680 struct Neighbour *n = th->neighbour;
682 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
683 GNUNET_assert (th == n->th);
684 GNUNET_assert (NULL == n->hn);
686 th->notify (th->notify_cls, 0, NULL);
692 * Transmit message(s) to service.
694 * @param cls handle to transport
695 * @param size number of bytes available in buf
696 * @param buf where to copy the message
697 * @return number of bytes copied to buf
700 transport_notify_ready (void *cls, size_t size, void *buf)
702 struct GNUNET_TRANSPORT_Handle *h = cls;
703 struct GNUNET_TRANSPORT_TransmitHandle *th;
706 struct OutboundMessage obm;
711 GNUNET_assert (NULL != h->client);
715 /* transmission failed */
716 disconnect_and_schedule_reconnect (h);
722 /* first send control messages */
723 while ((NULL != (th = h->control_head)) && (th->notify_size <= size))
725 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
726 nret = th->notify (th->notify_cls, size, &cbuf[ret]);
727 LOG (GNUNET_ERROR_TYPE_DEBUG, "Added %u bytes of control message at %u\n",
734 /* then, if possible and no control messages pending, send data messages */
735 while ((NULL == h->control_head) &&
736 (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))))
738 if (GNUNET_YES != n->is_ready)
740 /* peer not ready, wait for notification! */
741 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
743 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == n->th->timeout_task);
744 n->th->timeout_task =
745 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
747 &timeout_request_due_to_congestion,
752 if (th->notify_size + sizeof (struct OutboundMessage) > size)
753 break; /* does not fit */
754 if (GNUNET_BANDWIDTH_tracker_get_delay
755 (&n->out_tracker, th->notify_size).rel_value > 0)
756 break; /* too early */
757 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
760 n->is_ready = GNUNET_NO;
761 GNUNET_assert (size >= sizeof (struct OutboundMessage));
763 th->notify (th->notify_cls, size - sizeof (struct OutboundMessage),
764 &cbuf[ret + sizeof (struct OutboundMessage)]);
765 GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
768 GNUNET_assert (mret + sizeof (struct OutboundMessage) <
769 GNUNET_SERVER_MAX_MESSAGE_SIZE);
770 obm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND);
771 obm.header.size = htons (mret + sizeof (struct OutboundMessage));
772 obm.priority = htonl (th->priority);
774 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
777 memcpy (&cbuf[ret], &obm, sizeof (struct OutboundMessage));
778 ret += (mret + sizeof (struct OutboundMessage));
779 size -= (mret + sizeof (struct OutboundMessage));
780 GNUNET_BANDWIDTH_tracker_consume (&n->out_tracker, mret);
784 /* if there are more pending messages, try to schedule those */
785 schedule_transmission (h);
786 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting %u bytes to transport service\n",
793 * Schedule the task to send one message, either from the control
794 * list or the peer message queues to the service.
796 * @param cls transport service to schedule a transmission for
797 * @param tc scheduler context
800 schedule_transmission_task (void *cls,
801 const struct GNUNET_SCHEDULER_TaskContext *tc)
803 struct GNUNET_TRANSPORT_Handle *h = cls;
805 struct GNUNET_TRANSPORT_TransmitHandle *th;
808 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
809 GNUNET_assert (NULL != h->client);
810 /* destroy all requests that have timed out */
811 while ((NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))) &&
812 (GNUNET_TIME_absolute_get_remaining (n->th->timeout).rel_value == 0))
814 /* notify client that the request could not be satisfied within
815 * the given time constraints */
818 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
820 LOG (GNUNET_ERROR_TYPE_DEBUG,
821 "Signalling timeout for transmission to peer %s due to congestion\n",
822 GNUNET_i2s (&n->id));
823 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
828 if (NULL != h->control_head)
830 size = h->control_head->notify_size;
834 n = GNUNET_CONTAINER_heap_peek (h->ready_heap);
836 return; /* no pending messages */
837 size = n->th->notify_size + sizeof (struct OutboundMessage);
839 LOG (GNUNET_ERROR_TYPE_DEBUG, "Calling notify_transmit_ready\n");
841 GNUNET_CLIENT_notify_transmit_ready (h->client, size,
842 GNUNET_TIME_UNIT_FOREVER_REL,
843 GNUNET_NO, &transport_notify_ready,
845 GNUNET_assert (NULL != h->cth);
850 * Schedule the task to send one message, either from the control
851 * list or the peer message queues to the service.
853 * @param h transport service to schedule a transmission for
856 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h)
858 struct GNUNET_TIME_Relative delay;
861 GNUNET_assert (NULL != h->client);
862 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
864 GNUNET_SCHEDULER_cancel (h->quota_task);
865 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
867 if (NULL != h->control_head)
868 delay = GNUNET_TIME_UNIT_ZERO;
869 else if (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap)))
872 GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker,
873 n->th->notify_size + n->traffic_overhead);
874 n->traffic_overhead = 0;
877 return; /* no work to be done */
878 LOG (GNUNET_ERROR_TYPE_DEBUG,
879 "Scheduling next transmission to service in %llu ms\n",
880 (unsigned long long) delay.rel_value);
882 GNUNET_SCHEDULER_add_delayed (delay, &schedule_transmission_task, h);
887 * Queue control request for transmission to the transport
890 * @param h handle to the transport service
891 * @param size number of bytes to be transmitted
892 * @param notify function to call to get the content
893 * @param notify_cls closure for notify
894 * @return a GNUNET_TRANSPORT_TransmitHandle
896 static struct GNUNET_TRANSPORT_TransmitHandle *
897 schedule_control_transmit (struct GNUNET_TRANSPORT_Handle *h, size_t size,
898 GNUNET_CONNECTION_TransmitReadyNotify notify,
901 struct GNUNET_TRANSPORT_TransmitHandle *th;
903 LOG (GNUNET_ERROR_TYPE_DEBUG, "Control transmit of %u bytes requested\n",
905 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
907 th->notify_cls = notify_cls;
908 th->notify_size = size;
909 GNUNET_CONTAINER_DLL_insert_tail (h->control_head, h->control_tail, th);
910 schedule_transmission (h);
916 * Transmit START message to service.
919 * @param size number of bytes available in buf
920 * @param buf where to copy the message
921 * @return number of bytes copied to buf
924 send_start (void *cls, size_t size, void *buf)
926 struct GNUNET_TRANSPORT_Handle *h = cls;
927 struct StartMessage s;
932 /* Can only be shutdown, just give up */
933 LOG (GNUNET_ERROR_TYPE_DEBUG,
934 "Shutdown while trying to transmit `%s' request.\n", "START");
937 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "START");
938 GNUNET_assert (size >= sizeof (struct StartMessage));
939 s.header.size = htons (sizeof (struct StartMessage));
940 s.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
946 s.options = htonl (options);
948 memcpy (buf, &s, sizeof (struct StartMessage));
949 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
950 GNUNET_TIME_UNIT_FOREVER_REL);
951 return sizeof (struct StartMessage);
956 * Try again to connect to transport service.
958 * @param cls the handle to the transport service
959 * @param tc scheduler context
962 reconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
964 struct GNUNET_TRANSPORT_Handle *h = cls;
966 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
967 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
969 /* shutdown, just give up */
972 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service.\n");
973 GNUNET_assert (h->client == NULL);
974 GNUNET_assert (h->control_head == NULL);
975 GNUNET_assert (h->control_tail == NULL);
976 h->client = GNUNET_CLIENT_connect ("transport", h->cfg);
977 GNUNET_assert (h->client != NULL);
978 schedule_control_transmit (h, sizeof (struct StartMessage), &send_start, h);
983 * Function that will schedule the job that will try
984 * to connect us again to the client.
986 * @param h transport service to reconnect
989 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
991 struct GNUNET_TRANSPORT_TransmitHandle *th;
993 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
996 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
999 if (NULL != h->client)
1001 GNUNET_CLIENT_disconnect (h->client);
1004 /* Forget about all neighbours that we used to be connected to */
1005 GNUNET_CONTAINER_multihashmap_iterate (h->neighbours, &neighbour_delete, h);
1006 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
1008 GNUNET_SCHEDULER_cancel (h->quota_task);
1009 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
1011 while ((NULL != (th = h->control_head)))
1013 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
1014 th->notify (th->notify_cls, 0, NULL);
1017 LOG (GNUNET_ERROR_TYPE_DEBUG,
1018 "Scheduling task to reconnect to transport service in %llu ms.\n",
1019 h->reconnect_delay.rel_value);
1021 GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
1022 h->reconnect_delay = GNUNET_TIME_STD_BACKOFF (h->reconnect_delay);
1027 * Cancel control request for transmission to the transport service.
1029 * @param th handle to the transport service
1030 * @param tth transmit handle to cancel
1033 cancel_control_transmit (struct GNUNET_TRANSPORT_Handle *th, struct GNUNET_TRANSPORT_TransmitHandle *tth)
1035 GNUNET_assert (NULL != th);
1036 GNUNET_assert (NULL != tth);
1038 LOG (GNUNET_ERROR_TYPE_DEBUG, "Canceling transmit of contral transmission requested\n");
1040 GNUNET_CONTAINER_DLL_remove (th->control_head, th->control_tail, tth);
1047 * Send REQUEST_CONNECT message to the service.
1049 * @param cls the 'struct GNUNET_PeerIdentity'
1050 * @param size number of bytes available in buf
1051 * @param buf where to copy the message
1052 * @return number of bytes copied to buf
1055 send_try_connect (void *cls, size_t size, void *buf)
1057 struct GNUNET_TRANSPORT_TryConnectHandle *tch = cls;
1058 struct TransportRequestConnectMessage msg;
1062 if (NULL != tch->cb)
1063 tch->cb (tch->cb_cls, GNUNET_SYSERR);
1064 GNUNET_CONTAINER_DLL_remove (tch->th->tc_head, tch->th->tc_tail, tch);
1068 LOG (GNUNET_ERROR_TYPE_DEBUG,
1069 "Transmitting `%s' request with respect to `%4s'.\n", "REQUEST_CONNECT",
1070 GNUNET_i2s (&tch->pid));
1071 GNUNET_assert (size >= sizeof (struct TransportRequestConnectMessage));
1072 msg.header.size = htons (sizeof (struct TransportRequestConnectMessage));
1073 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT);
1074 msg.reserved = htonl (0);
1075 msg.peer = tch->pid;
1076 memcpy (buf, &msg, sizeof (msg));
1077 if (NULL != tch->cb)
1078 tch->cb (tch->cb_cls, GNUNET_OK);
1079 GNUNET_CONTAINER_DLL_remove (tch->th->tc_head, tch->th->tc_tail, tch);
1081 return sizeof (struct TransportRequestConnectMessage);
1085 * Ask the transport service to establish a connection to
1088 * @param handle connection to transport service
1089 * @param target who we should try to connect to
1090 * @param cb callback to be called when request was transmitted to transport
1092 * @param cb_cls closure for the callback
1093 * @return a GNUNET_TRANSPORT_TryConnectHandle handle or
1094 * NULL on failure (cb will not be called)
1096 struct GNUNET_TRANSPORT_TryConnectHandle *
1097 GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
1098 const struct GNUNET_PeerIdentity *target,
1099 GNUNET_TRANSPORT_TryConnectCallback cb,
1102 struct GNUNET_TRANSPORT_TryConnectHandle *tch = NULL;
1104 if (NULL == handle->client)
1107 tch = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TryConnectHandle));
1109 tch->pid = *(target);
1111 tch->cb_cls = cb_cls;
1112 tch->tth = schedule_control_transmit (handle,
1113 sizeof (struct TransportRequestConnectMessage),
1114 &send_try_connect, tch);
1115 GNUNET_CONTAINER_DLL_insert(handle->tc_head, handle->tc_tail, tch);
1121 * Cancel the request to transport to try a connect
1122 * Callback will not be called
1124 * @param tch GNUNET_TRANSPORT_TryConnectHandle handle to cancel
1127 GNUNET_TRANSPORT_try_connect_cancel (struct GNUNET_TRANSPORT_TryConnectHandle *tch)
1129 struct GNUNET_TRANSPORT_Handle *th;
1130 GNUNET_assert (NULL != tch);
1133 cancel_control_transmit (th, tch->tth);
1134 GNUNET_CONTAINER_DLL_remove (th->tc_head, th->tc_tail, tch);
1139 * Send HELLO message to the service.
1141 * @param cls the HELLO message to send
1142 * @param size number of bytes available in buf
1143 * @param buf where to copy the message
1144 * @return number of bytes copied to buf
1147 send_hello (void *cls, size_t size, void *buf)
1149 struct GNUNET_TRANSPORT_OfferHelloHandle *ohh = cls;
1150 struct GNUNET_MessageHeader *msg = ohh->msg;
1152 struct GNUNET_SCHEDULER_TaskContext tc;
1153 tc.read_ready = NULL;
1154 tc.write_ready = NULL;
1155 tc.reason = GNUNET_SCHEDULER_REASON_TIMEOUT;
1159 LOG (GNUNET_ERROR_TYPE_DEBUG,
1160 "Timeout while trying to transmit `%s' request.\n", "HELLO");
1161 if (NULL != ohh->cont)
1162 ohh->cont (ohh->cls, &tc);
1164 GNUNET_CONTAINER_DLL_remove (ohh->th->oh_head, ohh->th->oh_tail, ohh);
1168 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "HELLO");
1169 ssize = ntohs (msg->size);
1170 GNUNET_assert (size >= ssize);
1171 memcpy (buf, msg, ssize);
1173 tc.reason = GNUNET_SCHEDULER_REASON_READ_READY;
1174 if (NULL != ohh->cont)
1175 ohh->cont (ohh->cls, &tc);
1176 GNUNET_CONTAINER_DLL_remove (ohh->th->oh_head, ohh->th->oh_tail, ohh);
1183 * Send traffic metric message to the service.
1185 * @param cls the message to send
1186 * @param size number of bytes available in buf
1187 * @param buf where to copy the message
1188 * @return number of bytes copied to buf
1191 send_metric (void *cls, size_t size, void *buf)
1193 struct TrafficMetricMessage *msg = cls;
1197 LOG (GNUNET_ERROR_TYPE_DEBUG,
1198 "Timeout while trying to transmit `%s' request.\n", "TRAFFIC_METRIC");
1202 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "TRAFFIC_METRIC");
1203 ssize = ntohs (msg->header.size);
1204 GNUNET_assert (size >= ssize);
1205 memcpy (buf, msg, ssize);
1212 * Set transport metrics for a peer and a direction
1214 * @param handle transport handle
1215 * @param peer the peer to set the metric for
1216 * @param direction can be: TM_SEND, TM_RECV, TM_BOTH
1217 * @param ats the metric as ATS information
1218 * @param ats_count the number of metrics
1220 * Supported ATS values:
1221 * GNUNET_ATS_QUALITY_NET_DELAY (value in ms)
1222 * GNUNET_ATS_QUALITY_NET_DISTANCE (value in #hops)
1225 * To enforce a delay of 10 ms for peer p1 in sending direction use:
1227 * struct GNUNET_ATS_Information ats;
1228 * ats.type = ntohl (GNUNET_ATS_QUALITY_NET_DELAY);
1229 * ats.value = ntohl (10);
1230 * GNUNET_TRANSPORT_set_traffic_metric (th, p1, TM_SEND, &ats, 1);
1233 * Delay restrictions in receiving direction will be enforced with
1237 GNUNET_TRANSPORT_set_traffic_metric (struct GNUNET_TRANSPORT_Handle *handle,
1238 const struct GNUNET_PeerIdentity *peer,
1240 const struct GNUNET_ATS_Information *ats,
1243 struct TrafficMetricMessage *msg;
1245 GNUNET_assert (NULL != handle);
1246 GNUNET_assert (NULL != peer);
1247 GNUNET_assert (direction >= TM_SEND);
1248 GNUNET_assert (direction <= TM_BOTH);
1253 size_t len = sizeof (struct TrafficMetricMessage) +
1254 ats_count * sizeof (struct GNUNET_ATS_Information);
1256 msg = GNUNET_malloc (len);
1257 msg->header.size = htons (len);
1258 msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TRAFFIC_METRIC);
1259 msg->direction = htons (direction);
1260 msg->ats_count = htons (ats_count);
1261 msg->peer = (*peer);
1262 memcpy (&msg[1], ats, ats_count * sizeof (struct GNUNET_ATS_Information));
1263 schedule_control_transmit (handle, len, &send_metric, msg);
1269 * Offer the transport service the HELLO of another peer. Note that
1270 * the transport service may just ignore this message if the HELLO is
1271 * malformed or useless due to our local configuration.
1273 * @param handle connection to transport service
1274 * @param hello the hello message
1275 * @param cont continuation to call when HELLO has been sent,
1276 * tc reason GNUNET_SCHEDULER_REASON_TIMEOUT for fail
1277 * tc reasong GNUNET_SCHEDULER_REASON_READ_READY for success
1278 * @param cls closure for continuation
1279 * @return a GNUNET_TRANSPORT_OfferHelloHandle handle or NULL on failure,
1280 * in case of failure cont will not be called
1283 struct GNUNET_TRANSPORT_OfferHelloHandle *
1284 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
1285 const struct GNUNET_MessageHeader *hello,
1286 GNUNET_SCHEDULER_Task cont, void *cls)
1288 struct GNUNET_TRANSPORT_OfferHelloHandle *ohh;
1289 struct GNUNET_MessageHeader *msg;
1290 struct GNUNET_PeerIdentity peer;
1293 GNUNET_assert (NULL != handle);
1294 GNUNET_assert (NULL != hello);
1296 if (NULL == handle->client)
1299 GNUNET_break (ntohs (hello->type) == GNUNET_MESSAGE_TYPE_HELLO);
1300 size = ntohs (hello->size);
1301 GNUNET_break (size >= sizeof (struct GNUNET_MessageHeader));
1303 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hello, &peer))
1309 msg = GNUNET_malloc (size);
1310 memcpy (msg, hello, size);
1311 LOG (GNUNET_ERROR_TYPE_DEBUG,
1312 "Offering `%s' message of `%4s' to transport for validation.\n", "HELLO",
1313 GNUNET_i2s (&peer));
1315 ohh = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_OfferHelloHandle));
1320 ohh->tth = schedule_control_transmit (handle, size, &send_hello, ohh);
1321 GNUNET_CONTAINER_DLL_insert (handle->oh_head, handle->oh_tail, ohh);
1327 * Cancel the request to transport to offer the HELLO message
1329 * @param ohh the GNUNET_TRANSPORT_OfferHelloHandle to cancel
1332 GNUNET_TRANSPORT_offer_hello_cancel (struct GNUNET_TRANSPORT_OfferHelloHandle *ohh)
1334 struct GNUNET_TRANSPORT_Handle *th = ohh->th;
1335 GNUNET_assert (NULL != ohh);
1337 cancel_control_transmit (ohh->th, ohh->tth);
1338 GNUNET_CONTAINER_DLL_remove (th->oh_head, th->oh_tail, ohh);
1339 GNUNET_free (ohh->msg);
1344 GNUNET_TRANSPORT_check_neighbour_connected (struct GNUNET_TRANSPORT_Handle *handle,
1345 const struct GNUNET_PeerIdentity *peer)
1347 GNUNET_assert (NULL != handle);
1348 GNUNET_assert (NULL != peer);
1350 if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains(handle->neighbours, &peer->hashPubKey))
1358 * Task to call the HelloUpdateCallback of the GetHelloHandle
1360 * @param cls the GetHelloHandle
1361 * @param tc the scheduler task context
1364 call_hello_update_cb_async (void *cls,
1365 const struct GNUNET_SCHEDULER_TaskContext *tc)
1367 struct GNUNET_TRANSPORT_GetHelloHandle *ghh = cls;
1369 GNUNET_assert (NULL != ghh->handle->my_hello);
1370 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != ghh->notify_task);
1371 ghh->notify_task = GNUNET_SCHEDULER_NO_TASK;
1372 ghh->rec (ghh->rec_cls,
1373 (const struct GNUNET_MessageHeader *) ghh->handle->my_hello);
1378 * Obtain the HELLO message for this peer. The callback given in this function
1379 * is never called synchronously.
1381 * @param handle connection to transport service
1382 * @param rec function to call with the HELLO, sender will be our peer
1383 * identity; message and sender will be NULL on timeout
1384 * (handshake with transport service pending/failed).
1385 * cost estimate will be 0.
1386 * @param rec_cls closure for rec
1387 * @return handle to cancel the operation
1389 struct GNUNET_TRANSPORT_GetHelloHandle *
1390 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
1391 GNUNET_TRANSPORT_HelloUpdateCallback rec,
1394 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
1396 hwl = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_GetHelloHandle));
1398 hwl->rec_cls = rec_cls;
1399 hwl->handle = handle;
1400 GNUNET_CONTAINER_DLL_insert (handle->hwl_head, handle->hwl_tail, hwl);
1401 if (handle->my_hello != NULL)
1402 hwl->notify_task = GNUNET_SCHEDULER_add_now (&call_hello_update_cb_async,
1409 * Stop receiving updates about changes to our HELLO message.
1411 * @param ghh handle to cancel
1414 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_GetHelloHandle *ghh)
1416 struct GNUNET_TRANSPORT_Handle *handle = ghh->handle;
1418 if (GNUNET_SCHEDULER_NO_TASK != ghh->notify_task)
1419 GNUNET_SCHEDULER_cancel (ghh->notify_task);
1420 GNUNET_CONTAINER_DLL_remove (handle->hwl_head, handle->hwl_tail, ghh);
1426 * Connect to the transport service. Note that the connection may
1427 * complete (or fail) asynchronously.
1429 * @param cfg configuration to use
1430 * @param self our own identity (API should check that it matches
1431 * the identity found by transport), or NULL (no check)
1432 * @param cls closure for the callbacks
1433 * @param rec receive function to call
1434 * @param nc function to call on connect events
1435 * @param nd function to call on disconnect events
1437 struct GNUNET_TRANSPORT_Handle *
1438 GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1439 const struct GNUNET_PeerIdentity *self, void *cls,
1440 GNUNET_TRANSPORT_ReceiveCallback rec,
1441 GNUNET_TRANSPORT_NotifyConnect nc,
1442 GNUNET_TRANSPORT_NotifyDisconnect nd)
1444 struct GNUNET_TRANSPORT_Handle *ret;
1446 ret = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_Handle));
1450 ret->check_self = GNUNET_YES;
1457 ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
1459 GNUNET_CONTAINER_multihashmap_create (STARTING_NEIGHBOURS_SIZE, GNUNET_YES);
1461 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1462 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service.\n");
1463 ret->client = GNUNET_CLIENT_connect ("transport", cfg);
1464 if (ret->client == NULL)
1469 schedule_control_transmit (ret, sizeof (struct StartMessage), &send_start, ret);
1475 * Disconnect from the transport service.
1477 * @param handle handle to the service as returned from GNUNET_TRANSPORT_connect
1480 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
1482 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transport disconnect called!\n");
1483 /* this disconnects all neighbours... */
1484 if (handle->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1485 disconnect_and_schedule_reconnect (handle);
1486 /* and now we stop trying to connect again... */
1487 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1489 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1490 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1492 GNUNET_CONTAINER_multihashmap_destroy (handle->neighbours);
1493 handle->neighbours = NULL;
1494 if (handle->quota_task != GNUNET_SCHEDULER_NO_TASK)
1496 GNUNET_SCHEDULER_cancel (handle->quota_task);
1497 handle->quota_task = GNUNET_SCHEDULER_NO_TASK;
1499 GNUNET_free_non_null (handle->my_hello);
1500 handle->my_hello = NULL;
1501 GNUNET_assert (handle->tc_head == NULL);
1502 GNUNET_assert (handle->tc_tail == NULL);
1503 GNUNET_assert (handle->hwl_head == NULL);
1504 GNUNET_assert (handle->hwl_tail == NULL);
1505 GNUNET_CONTAINER_heap_destroy (handle->ready_heap);
1506 handle->ready_heap = NULL;
1507 GNUNET_free (handle);
1512 * Check if we could queue a message of the given size for
1513 * transmission. The transport service will take both its
1514 * internal buffers and bandwidth limits imposed by the
1515 * other peer into consideration when answering this query.
1517 * @param handle connection to transport service
1518 * @param target who should receive the message
1519 * @param size how big is the message we want to transmit?
1520 * @param priority how important is the message?
1521 * @param timeout after how long should we give up (and call
1522 * notify with buf NULL and size 0)?
1523 * @param notify function to call when we are ready to
1524 * send such a message
1525 * @param notify_cls closure for notify
1526 * @return NULL if someone else is already waiting to be notified
1527 * non-NULL if the notify callback was queued (can be used to cancel
1528 * using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
1530 struct GNUNET_TRANSPORT_TransmitHandle *
1531 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
1532 const struct GNUNET_PeerIdentity
1533 *target, size_t size, uint32_t priority,
1534 struct GNUNET_TIME_Relative timeout,
1535 GNUNET_CONNECTION_TransmitReadyNotify
1536 notify, void *notify_cls)
1538 struct Neighbour *n;
1539 struct GNUNET_TRANSPORT_TransmitHandle *th;
1540 struct GNUNET_TIME_Relative delay;
1542 n = neighbour_find (handle, target);
1545 /* use GNUNET_TRANSPORT_try_connect first, only use this function
1546 * once a connection has been established */
1552 /* attempt to send two messages at the same time to the same peer */
1556 GNUNET_assert (NULL == n->hn);
1557 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
1559 th->notify = notify;
1560 th->notify_cls = notify_cls;
1561 th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1562 th->notify_size = size;
1563 th->priority = priority;
1565 /* calculate when our transmission should be ready */
1566 delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, size + n->traffic_overhead);
1567 n->traffic_overhead = 0;
1568 if (delay.rel_value > timeout.rel_value)
1569 delay.rel_value = 0; /* notify immediately (with failure) */
1570 LOG (GNUNET_ERROR_TYPE_DEBUG,
1571 "Bandwidth tracker allows next transmission to peer %s in %llu ms\n",
1572 GNUNET_i2s (target), (unsigned long long) delay.rel_value);
1573 n->hn = GNUNET_CONTAINER_heap_insert (handle->ready_heap, n, delay.rel_value);
1574 schedule_transmission (handle);
1580 * Cancel the specified transmission-ready notification.
1582 * @param th handle returned from GNUNET_TRANSPORT_notify_transmit_ready
1585 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct
1586 GNUNET_TRANSPORT_TransmitHandle
1589 struct Neighbour *n;
1591 GNUNET_assert (NULL == th->next);
1592 GNUNET_assert (NULL == th->prev);
1594 GNUNET_assert (th == n->th);
1598 GNUNET_CONTAINER_heap_remove_node (n->hn);
1603 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != th->timeout_task);
1604 GNUNET_SCHEDULER_cancel (th->timeout_task);
1605 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1611 /* end of transport_api.c */