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.
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
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 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
479 struct GNUNET_TRANSPORT_GetHelloHandle *next_hwl;
481 struct GNUNET_PeerIdentity me;
484 uint32_t bytes_physical;
486 GNUNET_assert (h->client != NULL);
489 LOG (GNUNET_ERROR_TYPE_DEBUG,
490 "Error receiving from transport service, disconnecting temporarily.\n");
491 disconnect_and_schedule_reconnect (h);
494 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
495 GNUNET_TIME_UNIT_FOREVER_REL);
496 size = ntohs (msg->size);
497 switch (ntohs (msg->type))
499 case GNUNET_MESSAGE_TYPE_HELLO:
500 case GNUNET_MESSAGE_TYPE_FRIEND_HELLO:
502 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) msg, &me))
507 LOG (GNUNET_ERROR_TYPE_DEBUG,
508 "Receiving (my own) `%s' message, I am `%4s'.\n", "HELLO",
510 GNUNET_free_non_null (h->my_hello);
512 if (size < sizeof (struct GNUNET_MessageHeader))
517 h->my_hello = GNUNET_malloc (size);
518 memcpy (h->my_hello, msg, size);
522 next_hwl = hwl->next;
523 hwl->rec (hwl->rec_cls,
524 (const struct GNUNET_MessageHeader *) h->my_hello);
528 case GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT:
529 if (size < sizeof (struct ConnectInfoMessage))
534 cim = (const struct ConnectInfoMessage *) msg;
536 sizeof (struct ConnectInfoMessage))
541 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s'.\n",
542 "CONNECT", GNUNET_i2s (&cim->id));
543 n = neighbour_find (h, &cim->id);
549 n = neighbour_add (h, &cim->id);
550 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s' with quota %u\n",
551 "CONNECT", GNUNET_i2s (&cim->id), ntohl (cim->quota_out.value__));
552 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, cim->quota_out);
553 if (h->nc_cb != NULL)
554 h->nc_cb (h->cls, &n->id);
556 case GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT:
557 if (size != sizeof (struct DisconnectInfoMessage))
562 dim = (const struct DisconnectInfoMessage *) msg;
563 GNUNET_break (ntohl (dim->reserved) == 0);
564 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s'.\n",
565 "DISCONNECT", GNUNET_i2s (&dim->peer));
566 n = neighbour_find (h, &dim->peer);
572 neighbour_delete (h, &dim->peer.hashPubKey, n);
574 case GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK:
575 if (size != sizeof (struct SendOkMessage))
580 okm = (const struct SendOkMessage *) msg;
581 bytes_msg = ntohl (okm->bytes_msg);
582 bytes_physical = ntohl (okm->bytes_physical);
583 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message, transmission %s.\n",
584 "SEND_OK", ntohl (okm->success) == GNUNET_OK ? "succeeded" : "failed");
586 n = neighbour_find (h, &okm->peer);
590 if (bytes_physical >= bytes_msg)
592 LOG (GNUNET_ERROR_TYPE_DEBUG, "Overhead for %u byte message: %u \n",
593 bytes_msg, bytes_physical - bytes_msg);
594 n->traffic_overhead += bytes_physical - bytes_msg;
596 GNUNET_break (GNUNET_NO == n->is_ready);
597 n->is_ready = GNUNET_YES;
598 if ((n->th != NULL) && (n->hn == NULL))
600 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->th->timeout_task);
601 GNUNET_SCHEDULER_cancel (n->th->timeout_task);
602 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
603 /* we've been waiting for this (congestion, not quota,
604 * caused delayed transmission) */
605 n->hn = GNUNET_CONTAINER_heap_insert (h->ready_heap, n, 0);
606 schedule_transmission (h);
609 case GNUNET_MESSAGE_TYPE_TRANSPORT_RECV:
610 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message.\n", "RECV");
612 sizeof (struct InboundMessage) + sizeof (struct GNUNET_MessageHeader))
617 im = (const struct InboundMessage *) msg;
618 imm = (const struct GNUNET_MessageHeader *) &im[1];
619 if (ntohs (imm->size) + sizeof (struct InboundMessage) != size)
624 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received message of type %u from `%4s'.\n",
625 ntohs (imm->type), GNUNET_i2s (&im->peer));
626 n = neighbour_find (h, &im->peer);
633 h->rec (h->cls, &im->peer, imm);
635 case GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA:
636 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message.\n", "SET_QUOTA");
637 if (size != sizeof (struct QuotaSetMessage))
642 qm = (const struct QuotaSetMessage *) msg;
643 n = neighbour_find (h, &qm->peer);
646 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s' with quota %u\n",
647 "SET_QUOTA", GNUNET_i2s (&qm->peer), ntohl (qm->quota.value__));
648 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, qm->quota);
651 LOG (GNUNET_ERROR_TYPE_ERROR,
652 _("Received unexpected message of type %u in %s:%u\n"),
653 ntohs (msg->type), __FILE__, __LINE__);
661 * A transmission request could not be satisfied because of
662 * network congestion. Notify the initiator and clean up.
664 * @param cls the 'struct GNUNET_TRANSPORT_TransmitHandle'
665 * @param tc scheduler context
668 timeout_request_due_to_congestion (void *cls,
669 const struct GNUNET_SCHEDULER_TaskContext
672 struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
673 struct Neighbour *n = th->neighbour;
675 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
676 GNUNET_assert (th == n->th);
677 GNUNET_assert (NULL == n->hn);
679 th->notify (th->notify_cls, 0, NULL);
685 * Transmit message(s) to service.
687 * @param cls handle to transport
688 * @param size number of bytes available in buf
689 * @param buf where to copy the message
690 * @return number of bytes copied to buf
693 transport_notify_ready (void *cls, size_t size, void *buf)
695 struct GNUNET_TRANSPORT_Handle *h = cls;
696 struct GNUNET_TRANSPORT_TransmitHandle *th;
699 struct OutboundMessage obm;
704 GNUNET_assert (NULL != h->client);
708 /* transmission failed */
709 disconnect_and_schedule_reconnect (h);
715 /* first send control messages */
716 while ((NULL != (th = h->control_head)) && (th->notify_size <= size))
718 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
719 nret = th->notify (th->notify_cls, size, &cbuf[ret]);
720 LOG (GNUNET_ERROR_TYPE_DEBUG, "Added %u bytes of control message at %u\n",
727 /* then, if possible and no control messages pending, send data messages */
728 while ((NULL == h->control_head) &&
729 (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))))
731 if (GNUNET_YES != n->is_ready)
733 /* peer not ready, wait for notification! */
734 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
736 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == n->th->timeout_task);
737 n->th->timeout_task =
738 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
740 &timeout_request_due_to_congestion,
745 if (th->notify_size + sizeof (struct OutboundMessage) > size)
746 break; /* does not fit */
747 if (GNUNET_BANDWIDTH_tracker_get_delay
748 (&n->out_tracker, th->notify_size).rel_value > 0)
749 break; /* too early */
750 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
753 n->is_ready = GNUNET_NO;
754 GNUNET_assert (size >= sizeof (struct OutboundMessage));
756 th->notify (th->notify_cls, size - sizeof (struct OutboundMessage),
757 &cbuf[ret + sizeof (struct OutboundMessage)]);
758 GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
761 GNUNET_assert (mret + sizeof (struct OutboundMessage) <
762 GNUNET_SERVER_MAX_MESSAGE_SIZE);
763 obm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND);
764 obm.header.size = htons (mret + sizeof (struct OutboundMessage));
765 obm.priority = htonl (th->priority);
767 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
770 memcpy (&cbuf[ret], &obm, sizeof (struct OutboundMessage));
771 ret += (mret + sizeof (struct OutboundMessage));
772 size -= (mret + sizeof (struct OutboundMessage));
773 GNUNET_BANDWIDTH_tracker_consume (&n->out_tracker, mret);
777 /* if there are more pending messages, try to schedule those */
778 schedule_transmission (h);
779 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting %u bytes to transport service\n",
786 * Schedule the task to send one message, either from the control
787 * list or the peer message queues to the service.
789 * @param cls transport service to schedule a transmission for
790 * @param tc scheduler context
793 schedule_transmission_task (void *cls,
794 const struct GNUNET_SCHEDULER_TaskContext *tc)
796 struct GNUNET_TRANSPORT_Handle *h = cls;
798 struct GNUNET_TRANSPORT_TransmitHandle *th;
801 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
802 GNUNET_assert (NULL != h->client);
803 /* destroy all requests that have timed out */
804 while ((NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))) &&
805 (GNUNET_TIME_absolute_get_remaining (n->th->timeout).rel_value == 0))
807 /* notify client that the request could not be satisfied within
808 * the given time constraints */
811 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
813 LOG (GNUNET_ERROR_TYPE_DEBUG,
814 "Signalling timeout for transmission to peer %s due to congestion\n",
815 GNUNET_i2s (&n->id));
816 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
821 if (NULL != h->control_head)
823 size = h->control_head->notify_size;
827 n = GNUNET_CONTAINER_heap_peek (h->ready_heap);
829 return; /* no pending messages */
830 size = n->th->notify_size + sizeof (struct OutboundMessage);
832 LOG (GNUNET_ERROR_TYPE_DEBUG, "Calling notify_transmit_ready\n");
834 GNUNET_CLIENT_notify_transmit_ready (h->client, size,
835 GNUNET_TIME_UNIT_FOREVER_REL,
836 GNUNET_NO, &transport_notify_ready,
838 GNUNET_assert (NULL != h->cth);
843 * Schedule the task to send one message, either from the control
844 * list or the peer message queues to the service.
846 * @param h transport service to schedule a transmission for
849 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h)
851 struct GNUNET_TIME_Relative delay;
854 GNUNET_assert (NULL != h->client);
855 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
857 GNUNET_SCHEDULER_cancel (h->quota_task);
858 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
860 if (NULL != h->control_head)
861 delay = GNUNET_TIME_UNIT_ZERO;
862 else if (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap)))
865 GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker,
866 n->th->notify_size + n->traffic_overhead);
867 n->traffic_overhead = 0;
870 return; /* no work to be done */
871 LOG (GNUNET_ERROR_TYPE_DEBUG,
872 "Scheduling next transmission to service in %llu ms\n",
873 (unsigned long long) delay.rel_value);
875 GNUNET_SCHEDULER_add_delayed (delay, &schedule_transmission_task, h);
880 * Queue control request for transmission to the transport
883 * @param h handle to the transport service
884 * @param size number of bytes to be transmitted
885 * @param notify function to call to get the content
886 * @param notify_cls closure for notify
887 * @return a GNUNET_TRANSPORT_TransmitHandle
889 static struct GNUNET_TRANSPORT_TransmitHandle *
890 schedule_control_transmit (struct GNUNET_TRANSPORT_Handle *h, size_t size,
891 GNUNET_CONNECTION_TransmitReadyNotify notify,
894 struct GNUNET_TRANSPORT_TransmitHandle *th;
896 LOG (GNUNET_ERROR_TYPE_DEBUG, "Control transmit of %u bytes requested\n",
898 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
900 th->notify_cls = notify_cls;
901 th->notify_size = size;
902 GNUNET_CONTAINER_DLL_insert_tail (h->control_head, h->control_tail, th);
903 schedule_transmission (h);
909 * Transmit START message to service.
912 * @param size number of bytes available in buf
913 * @param buf where to copy the message
914 * @return number of bytes copied to buf
917 send_start (void *cls, size_t size, void *buf)
919 struct GNUNET_TRANSPORT_Handle *h = cls;
920 struct StartMessage s;
925 /* Can only be shutdown, just give up */
926 LOG (GNUNET_ERROR_TYPE_DEBUG,
927 "Shutdown while trying to transmit `%s' request.\n", "START");
930 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "START");
931 GNUNET_assert (size >= sizeof (struct StartMessage));
932 s.header.size = htons (sizeof (struct StartMessage));
933 s.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
939 s.options = htonl (options);
941 memcpy (buf, &s, sizeof (struct StartMessage));
942 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
943 GNUNET_TIME_UNIT_FOREVER_REL);
944 return sizeof (struct StartMessage);
949 * Try again to connect to transport service.
951 * @param cls the handle to the transport service
952 * @param tc scheduler context
955 reconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
957 struct GNUNET_TRANSPORT_Handle *h = cls;
959 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
960 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
962 /* shutdown, just give up */
965 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service.\n");
966 GNUNET_assert (h->client == NULL);
967 GNUNET_assert (h->control_head == NULL);
968 GNUNET_assert (h->control_tail == NULL);
969 h->client = GNUNET_CLIENT_connect ("transport", h->cfg);
970 GNUNET_assert (h->client != NULL);
971 schedule_control_transmit (h, sizeof (struct StartMessage), &send_start, h);
976 * Function that will schedule the job that will try
977 * to connect us again to the client.
979 * @param h transport service to reconnect
982 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
984 struct GNUNET_TRANSPORT_TransmitHandle *th;
986 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
989 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
992 if (NULL != h->client)
994 GNUNET_CLIENT_disconnect (h->client);
997 /* Forget about all neighbours that we used to be connected to */
998 GNUNET_CONTAINER_multihashmap_iterate (h->neighbours, &neighbour_delete, h);
999 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
1001 GNUNET_SCHEDULER_cancel (h->quota_task);
1002 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
1004 while ((NULL != (th = h->control_head)))
1006 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
1007 th->notify (th->notify_cls, 0, NULL);
1010 LOG (GNUNET_ERROR_TYPE_DEBUG,
1011 "Scheduling task to reconnect to transport service in %llu ms.\n",
1012 h->reconnect_delay.rel_value);
1014 GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
1015 h->reconnect_delay = GNUNET_TIME_STD_BACKOFF (h->reconnect_delay);
1020 * Cancel control request for transmission to the transport service.
1022 * @param th handle to the transport service
1023 * @param tth transmit handle to cancel
1026 cancel_control_transmit (struct GNUNET_TRANSPORT_Handle *th, struct GNUNET_TRANSPORT_TransmitHandle *tth)
1028 GNUNET_assert (NULL != th);
1029 GNUNET_assert (NULL != tth);
1031 LOG (GNUNET_ERROR_TYPE_DEBUG, "Canceling transmit of contral transmission requested\n");
1033 GNUNET_CONTAINER_DLL_remove (th->control_head, th->control_tail, tth);
1040 * Send REQUEST_CONNECT message to the service.
1042 * @param cls the 'struct GNUNET_PeerIdentity'
1043 * @param size number of bytes available in buf
1044 * @param buf where to copy the message
1045 * @return number of bytes copied to buf
1048 send_try_connect (void *cls, size_t size, void *buf)
1050 struct GNUNET_TRANSPORT_TryConnectHandle *tch = cls;
1051 struct TransportRequestConnectMessage msg;
1055 if (NULL != tch->cb)
1056 tch->cb (tch->cb_cls, GNUNET_SYSERR);
1057 GNUNET_CONTAINER_DLL_remove (tch->th->tc_head, tch->th->tc_tail, tch);
1061 LOG (GNUNET_ERROR_TYPE_DEBUG,
1062 "Transmitting `%s' request with respect to `%4s'.\n", "REQUEST_CONNECT",
1063 GNUNET_i2s (&tch->pid));
1064 GNUNET_assert (size >= sizeof (struct TransportRequestConnectMessage));
1065 msg.header.size = htons (sizeof (struct TransportRequestConnectMessage));
1066 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT);
1067 msg.reserved = htonl (0);
1068 msg.peer = tch->pid;
1069 memcpy (buf, &msg, sizeof (msg));
1070 if (NULL != tch->cb)
1071 tch->cb (tch->cb_cls, GNUNET_OK);
1072 GNUNET_CONTAINER_DLL_remove (tch->th->tc_head, tch->th->tc_tail, tch);
1074 return sizeof (struct TransportRequestConnectMessage);
1078 * Ask the transport service to establish a connection to
1081 * @param handle connection to transport service
1082 * @param target who we should try to connect to
1083 * @param cb callback to be called when request was transmitted to transport
1085 * @param cb_cls closure for the callback
1086 * @return a GNUNET_TRANSPORT_TryConnectHandle handle or
1087 * NULL on failure (cb will not be called)
1089 struct GNUNET_TRANSPORT_TryConnectHandle *
1090 GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
1091 const struct GNUNET_PeerIdentity *target,
1092 GNUNET_TRANSPORT_TryConnectCallback cb,
1095 struct GNUNET_TRANSPORT_TryConnectHandle *tch = NULL;
1097 if (NULL == handle->client)
1100 tch = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TryConnectHandle));
1102 tch->pid = *(target);
1104 tch->cb_cls = cb_cls;
1105 tch->tth = schedule_control_transmit (handle,
1106 sizeof (struct TransportRequestConnectMessage),
1107 &send_try_connect, tch);
1108 GNUNET_CONTAINER_DLL_insert(handle->tc_head, handle->tc_tail, tch);
1114 * Cancel the request to transport to try a connect
1115 * Callback will not be called
1117 * @param tch GNUNET_TRANSPORT_TryConnectHandle handle to cancel
1120 GNUNET_TRANSPORT_try_connect_cancel (struct GNUNET_TRANSPORT_TryConnectHandle *tch)
1122 struct GNUNET_TRANSPORT_Handle *th;
1123 GNUNET_assert (NULL != tch);
1126 cancel_control_transmit (th, tch->tth);
1127 GNUNET_CONTAINER_DLL_remove (th->tc_head, th->tc_tail, tch);
1132 * Send HELLO message to the service.
1134 * @param cls the HELLO message to send
1135 * @param size number of bytes available in buf
1136 * @param buf where to copy the message
1137 * @return number of bytes copied to buf
1140 send_hello (void *cls, size_t size, void *buf)
1142 struct GNUNET_TRANSPORT_OfferHelloHandle *ohh = cls;
1143 struct GNUNET_MessageHeader *msg = ohh->msg;
1145 struct GNUNET_SCHEDULER_TaskContext tc;
1146 tc.read_ready = NULL;
1147 tc.write_ready = NULL;
1148 tc.reason = GNUNET_SCHEDULER_REASON_TIMEOUT;
1152 LOG (GNUNET_ERROR_TYPE_DEBUG,
1153 "Timeout while trying to transmit `%s' request.\n", "HELLO");
1154 if (NULL != ohh->cont)
1155 ohh->cont (ohh->cls, &tc);
1157 GNUNET_CONTAINER_DLL_remove (ohh->th->oh_head, ohh->th->oh_tail, ohh);
1161 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "HELLO");
1162 ssize = ntohs (msg->size);
1163 GNUNET_assert (size >= ssize);
1164 memcpy (buf, msg, ssize);
1166 tc.reason = GNUNET_SCHEDULER_REASON_READ_READY;
1167 if (NULL != ohh->cont)
1168 ohh->cont (ohh->cls, &tc);
1169 GNUNET_CONTAINER_DLL_remove (ohh->th->oh_head, ohh->th->oh_tail, ohh);
1176 * Send traffic metric message to the service.
1178 * @param cls the message to send
1179 * @param size number of bytes available in buf
1180 * @param buf where to copy the message
1181 * @return number of bytes copied to buf
1184 send_metric (void *cls, size_t size, void *buf)
1186 struct TrafficMetricMessage *msg = cls;
1190 LOG (GNUNET_ERROR_TYPE_DEBUG,
1191 "Timeout while trying to transmit `%s' request.\n", "TRAFFIC_METRIC");
1195 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "TRAFFIC_METRIC");
1196 ssize = ntohs (msg->header.size);
1197 GNUNET_assert (size >= ssize);
1198 memcpy (buf, msg, ssize);
1205 * Set transport metrics for a peer and a direction
1207 * @param handle transport handle
1208 * @param peer the peer to set the metric for
1209 * @param inbound set inbound direction (GNUNET_YES or GNUNET_NO)
1210 * @param outbound set outbound direction (GNUNET_YES or GNUNET_NO)
1211 * @param ats the metric as ATS information
1212 * @param ats_count the number of metrics
1214 * Supported ATS values:
1215 * GNUNET_ATS_QUALITY_NET_DELAY (value in ms)
1216 * GNUNET_ATS_QUALITY_NET_DISTANCE (value in count(hops))
1219 * To enforce a delay of 10 ms for peer p1 in sending direction use:
1221 * struct GNUNET_ATS_Information ats;
1222 * ats.type = ntohl (GNUNET_ATS_QUALITY_NET_DELAY);
1223 * ats.value = ntohl (10);
1224 * GNUNET_TRANSPORT_set_traffic_metric (th, p1, TM_SEND, &ats, 1);
1227 * Delay restrictions in receiving direction will be enforced with
1231 GNUNET_TRANSPORT_set_traffic_metric (struct GNUNET_TRANSPORT_Handle *handle,
1232 const struct GNUNET_PeerIdentity *peer,
1235 const struct GNUNET_ATS_Information *ats,
1238 struct TrafficMetricMessage *msg;
1240 GNUNET_assert (NULL != handle);
1241 GNUNET_assert (NULL != peer);
1242 GNUNET_assert ((outbound == GNUNET_YES) || (outbound == GNUNET_NO));
1243 GNUNET_assert ((inbound == GNUNET_YES) || (inbound == GNUNET_NO));
1245 if ((GNUNET_NO == inbound) && (GNUNET_NO == outbound))
1250 size_t len = sizeof (struct TrafficMetricMessage) +
1251 ats_count * sizeof (struct GNUNET_ATS_Information);
1253 msg = GNUNET_malloc (len);
1254 msg->header.size = htons (len);
1255 msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TRAFFIC_METRIC);
1256 msg->direction = htons (0 + outbound + 2 * inbound);
1257 msg->ats_count = htons (ats_count);
1258 msg->peer = (*peer);
1259 memcpy (&msg[1], ats, ats_count * sizeof (struct GNUNET_ATS_Information));
1260 schedule_control_transmit (handle, len, &send_metric, msg);
1266 * Offer the transport service the HELLO of another peer. Note that
1267 * the transport service may just ignore this message if the HELLO is
1268 * malformed or useless due to our local configuration.
1270 * @param handle connection to transport service
1271 * @param hello the hello message
1272 * @param cont continuation to call when HELLO has been sent,
1273 * tc reason GNUNET_SCHEDULER_REASON_TIMEOUT for fail
1274 * tc reasong GNUNET_SCHEDULER_REASON_READ_READY for success
1275 * @param cls closure for continuation
1276 * @return a GNUNET_TRANSPORT_OfferHelloHandle handle or NULL on failure,
1277 * in case of failure cont will not be called
1280 struct GNUNET_TRANSPORT_OfferHelloHandle *
1281 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
1282 const struct GNUNET_MessageHeader *hello,
1283 GNUNET_SCHEDULER_Task cont, void *cls)
1285 struct GNUNET_TRANSPORT_OfferHelloHandle *ohh;
1286 struct GNUNET_MessageHeader *msg;
1287 struct GNUNET_PeerIdentity peer;
1290 GNUNET_assert (NULL != handle);
1291 GNUNET_assert (NULL != hello);
1293 if (NULL == handle->client)
1296 GNUNET_break ((ntohs (hello->type) == GNUNET_MESSAGE_TYPE_HELLO) ||
1297 (ntohs (hello->type) == GNUNET_MESSAGE_TYPE_FRIEND_HELLO));
1298 size = ntohs (hello->size);
1299 GNUNET_break (size >= sizeof (struct GNUNET_MessageHeader));
1301 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hello, &peer))
1307 msg = GNUNET_malloc (size);
1308 memcpy (msg, hello, size);
1309 LOG (GNUNET_ERROR_TYPE_DEBUG,
1310 "Offering `%s' message of `%4s' to transport for validation.\n", "HELLO",
1311 GNUNET_i2s (&peer));
1313 ohh = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_OfferHelloHandle));
1318 ohh->tth = schedule_control_transmit (handle, size, &send_hello, ohh);
1319 GNUNET_CONTAINER_DLL_insert (handle->oh_head, handle->oh_tail, ohh);
1325 * Cancel the request to transport to offer the HELLO message
1327 * @param ohh the GNUNET_TRANSPORT_OfferHelloHandle to cancel
1330 GNUNET_TRANSPORT_offer_hello_cancel (struct GNUNET_TRANSPORT_OfferHelloHandle *ohh)
1332 struct GNUNET_TRANSPORT_Handle *th = ohh->th;
1333 GNUNET_assert (NULL != ohh);
1335 cancel_control_transmit (ohh->th, ohh->tth);
1336 GNUNET_CONTAINER_DLL_remove (th->oh_head, th->oh_tail, ohh);
1337 GNUNET_free (ohh->msg);
1342 GNUNET_TRANSPORT_check_neighbour_connected (struct GNUNET_TRANSPORT_Handle *handle,
1343 const struct GNUNET_PeerIdentity *peer)
1345 GNUNET_assert (NULL != handle);
1346 GNUNET_assert (NULL != peer);
1348 if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains(handle->neighbours, &peer->hashPubKey))
1356 * Task to call the HelloUpdateCallback of the GetHelloHandle
1358 * @param cls the GetHelloHandle
1359 * @param tc the scheduler task context
1362 call_hello_update_cb_async (void *cls,
1363 const struct GNUNET_SCHEDULER_TaskContext *tc)
1365 struct GNUNET_TRANSPORT_GetHelloHandle *ghh = cls;
1367 GNUNET_assert (NULL != ghh->handle->my_hello);
1368 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != ghh->notify_task);
1369 ghh->notify_task = GNUNET_SCHEDULER_NO_TASK;
1370 ghh->rec (ghh->rec_cls,
1371 (const struct GNUNET_MessageHeader *) ghh->handle->my_hello);
1376 * Obtain the HELLO message for this peer. The callback given in this function
1377 * is never called synchronously.
1379 * @param handle connection to transport service
1380 * @param rec function to call with the HELLO, sender will be our peer
1381 * identity; message and sender will be NULL on timeout
1382 * (handshake with transport service pending/failed).
1383 * cost estimate will be 0.
1384 * @param rec_cls closure for rec
1385 * @return handle to cancel the operation
1387 struct GNUNET_TRANSPORT_GetHelloHandle *
1388 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
1389 GNUNET_TRANSPORT_HelloUpdateCallback rec,
1392 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
1394 hwl = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_GetHelloHandle));
1396 hwl->rec_cls = rec_cls;
1397 hwl->handle = handle;
1398 GNUNET_CONTAINER_DLL_insert (handle->hwl_head, handle->hwl_tail, hwl);
1399 if (handle->my_hello != NULL)
1400 hwl->notify_task = GNUNET_SCHEDULER_add_now (&call_hello_update_cb_async,
1407 * Stop receiving updates about changes to our HELLO message.
1409 * @param ghh handle to cancel
1412 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_GetHelloHandle *ghh)
1414 struct GNUNET_TRANSPORT_Handle *handle = ghh->handle;
1416 if (GNUNET_SCHEDULER_NO_TASK != ghh->notify_task)
1417 GNUNET_SCHEDULER_cancel (ghh->notify_task);
1418 GNUNET_CONTAINER_DLL_remove (handle->hwl_head, handle->hwl_tail, ghh);
1424 * Connect to the transport service. Note that the connection may
1425 * complete (or fail) asynchronously.
1427 * @param cfg configuration to use
1428 * @param self our own identity (API should check that it matches
1429 * the identity found by transport), or NULL (no check)
1430 * @param cls closure for the callbacks
1431 * @param rec receive function to call
1432 * @param nc function to call on connect events
1433 * @param nd function to call on disconnect events
1435 struct GNUNET_TRANSPORT_Handle *
1436 GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1437 const struct GNUNET_PeerIdentity *self, void *cls,
1438 GNUNET_TRANSPORT_ReceiveCallback rec,
1439 GNUNET_TRANSPORT_NotifyConnect nc,
1440 GNUNET_TRANSPORT_NotifyDisconnect nd)
1442 struct GNUNET_TRANSPORT_Handle *ret;
1444 ret = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_Handle));
1448 ret->check_self = GNUNET_YES;
1455 ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
1457 GNUNET_CONTAINER_multihashmap_create (STARTING_NEIGHBOURS_SIZE, GNUNET_YES);
1459 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1460 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service.\n");
1461 ret->client = GNUNET_CLIENT_connect ("transport", cfg);
1462 if (ret->client == NULL)
1467 schedule_control_transmit (ret, sizeof (struct StartMessage), &send_start, ret);
1473 * Disconnect from the transport service.
1475 * @param handle handle to the service as returned from GNUNET_TRANSPORT_connect
1478 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
1480 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transport disconnect called!\n");
1481 /* this disconnects all neighbours... */
1482 if (handle->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1483 disconnect_and_schedule_reconnect (handle);
1484 /* and now we stop trying to connect again... */
1485 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1487 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1488 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1490 GNUNET_CONTAINER_multihashmap_destroy (handle->neighbours);
1491 handle->neighbours = NULL;
1492 if (handle->quota_task != GNUNET_SCHEDULER_NO_TASK)
1494 GNUNET_SCHEDULER_cancel (handle->quota_task);
1495 handle->quota_task = GNUNET_SCHEDULER_NO_TASK;
1497 GNUNET_free_non_null (handle->my_hello);
1498 handle->my_hello = NULL;
1499 GNUNET_assert (handle->tc_head == NULL);
1500 GNUNET_assert (handle->tc_tail == NULL);
1501 GNUNET_assert (handle->hwl_head == NULL);
1502 GNUNET_assert (handle->hwl_tail == NULL);
1503 GNUNET_CONTAINER_heap_destroy (handle->ready_heap);
1504 handle->ready_heap = NULL;
1505 GNUNET_free (handle);
1510 * Check if we could queue a message of the given size for
1511 * transmission. The transport service will take both its
1512 * internal buffers and bandwidth limits imposed by the
1513 * other peer into consideration when answering this query.
1515 * @param handle connection to transport service
1516 * @param target who should receive the message
1517 * @param size how big is the message we want to transmit?
1518 * @param priority how important is the message?
1519 * @param timeout after how long should we give up (and call
1520 * notify with buf NULL and size 0)?
1521 * @param notify function to call when we are ready to
1522 * send such a message
1523 * @param notify_cls closure for notify
1524 * @return NULL if someone else is already waiting to be notified
1525 * non-NULL if the notify callback was queued (can be used to cancel
1526 * using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
1528 struct GNUNET_TRANSPORT_TransmitHandle *
1529 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
1530 const struct GNUNET_PeerIdentity
1531 *target, size_t size, uint32_t priority,
1532 struct GNUNET_TIME_Relative timeout,
1533 GNUNET_CONNECTION_TransmitReadyNotify
1534 notify, void *notify_cls)
1536 struct Neighbour *n;
1537 struct GNUNET_TRANSPORT_TransmitHandle *th;
1538 struct GNUNET_TIME_Relative delay;
1540 n = neighbour_find (handle, target);
1543 /* use GNUNET_TRANSPORT_try_connect first, only use this function
1544 * once a connection has been established */
1550 /* attempt to send two messages at the same time to the same peer */
1554 GNUNET_assert (NULL == n->hn);
1555 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
1557 th->notify = notify;
1558 th->notify_cls = notify_cls;
1559 th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1560 th->notify_size = size;
1561 th->priority = priority;
1563 /* calculate when our transmission should be ready */
1564 delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, size + n->traffic_overhead);
1565 n->traffic_overhead = 0;
1566 if (delay.rel_value > timeout.rel_value)
1567 delay.rel_value = 0; /* notify immediately (with failure) */
1568 LOG (GNUNET_ERROR_TYPE_DEBUG,
1569 "Bandwidth tracker allows next transmission to peer %s in %llu ms\n",
1570 GNUNET_i2s (target), (unsigned long long) delay.rel_value);
1571 n->hn = GNUNET_CONTAINER_heap_insert (handle->ready_heap, n, delay.rel_value);
1572 schedule_transmission (handle);
1578 * Cancel the specified transmission-ready notification.
1580 * @param th handle returned from GNUNET_TRANSPORT_notify_transmit_ready
1583 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct
1584 GNUNET_TRANSPORT_TransmitHandle
1587 struct Neighbour *n;
1589 GNUNET_assert (NULL == th->next);
1590 GNUNET_assert (NULL == th->prev);
1592 GNUNET_assert (th == n->th);
1596 GNUNET_CONTAINER_heap_remove_node (n->hn);
1601 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != th->timeout_task);
1602 GNUNET_SCHEDULER_cancel (th->timeout_task);
1603 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1609 /* end of transport_api.c */