2 This file is part of GNUnet.
3 Copyright (C) 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.
21 * @file fs/gnunet-service-fs_cp.c
22 * @brief API to handle 'connected peers'
23 * @author Christian Grothoff
26 #include "gnunet_util_lib.h"
27 #include "gnunet_load_lib.h"
28 #include "gnunet-service-fs.h"
29 #include "gnunet-service-fs_cp.h"
30 #include "gnunet-service-fs_pe.h"
31 #include "gnunet-service-fs_pr.h"
32 #include "gnunet-service-fs_push.h"
33 #include "gnunet_peerstore_service.h"
37 * Ratio for moving average delay calculation. The previous
38 * average goes in with a factor of (n-1) into the calculation.
41 #define RUNAVG_DELAY_N 16
44 * How often do we flush respect values to disk?
46 #define RESPECT_FLUSH_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
49 * After how long do we discard a reply?
51 #define REPLY_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
54 * Collect an instane number of statistics? May cause excessive IPC.
56 #define INSANE_STATISTICS GNUNET_NO
60 * Handle to cancel a transmission request.
62 struct GSF_PeerTransmitHandle
66 * Kept in a doubly-linked list.
68 struct GSF_PeerTransmitHandle *next;
71 * Kept in a doubly-linked list.
73 struct GSF_PeerTransmitHandle *prev;
76 * Time when this transmission request was issued.
78 struct GNUNET_TIME_Absolute transmission_request_start_time;
81 * Timeout for this request.
83 struct GNUNET_TIME_Absolute timeout;
86 * Task called on timeout, or 0 for none.
88 struct GNUNET_SCHEDULER_Task *timeout_task;
91 * Function to call to get the actual message.
93 GSF_GetMessageCallback gmc;
96 * Peer this request targets.
98 struct GSF_ConnectedPeer *cp;
101 * Closure for @e gmc.
106 * Size of the message to be transmitted.
111 * #GNUNET_YES if this is a query, #GNUNET_NO for content.
116 * Did we get a reservation already?
121 * Priority of this request.
129 * Handle for an entry in our delay list.
131 struct GSF_DelayedHandle
135 * Kept in a doubly-linked list.
137 struct GSF_DelayedHandle *next;
140 * Kept in a doubly-linked list.
142 struct GSF_DelayedHandle *prev;
145 * Peer this transmission belongs to.
147 struct GSF_ConnectedPeer *cp;
150 * The PUT that was delayed.
152 struct PutMessage *pm;
155 * Task for the delay.
157 struct GNUNET_SCHEDULER_Task *delay_task;
160 * Size of the message.
168 * Information per peer and request.
174 * Handle to generic request.
176 struct GSF_PendingRequest *pr;
179 * Handle to specific peer.
181 struct GSF_ConnectedPeer *cp;
184 * Task for asynchronous stopping of this request.
186 struct GNUNET_SCHEDULER_Task *kill_task;
194 struct GSF_ConnectedPeer
198 * Performance data for this peer.
200 struct GSF_PeerPerformanceData ppd;
203 * Time until when we blocked this peer from migrating
206 struct GNUNET_TIME_Absolute last_migration_block;
209 * Task scheduled to revive migration to this peer.
211 struct GNUNET_SCHEDULER_Task *mig_revive_task;
214 * Messages (replies, queries, content migration) we would like to
215 * send to this peer in the near future. Sorted by priority, head.
217 struct GSF_PeerTransmitHandle *pth_head;
220 * Messages (replies, queries, content migration) we would like to
221 * send to this peer in the near future. Sorted by priority, tail.
223 struct GSF_PeerTransmitHandle *pth_tail;
226 * Messages (replies, queries, content migration) we would like to
227 * send to this peer in the near future. Sorted by priority, head.
229 struct GSF_DelayedHandle *delayed_head;
232 * Messages (replies, queries, content migration) we would like to
233 * send to this peer in the near future. Sorted by priority, tail.
235 struct GSF_DelayedHandle *delayed_tail;
238 * Migration stop message in our queue, or NULL if we have none pending.
240 struct GSF_PeerTransmitHandle *migration_pth;
243 * Context of our GNUNET_ATS_reserve_bandwidth call (or NULL).
245 struct GNUNET_ATS_ReservationContext *rc;
248 * Task scheduled if we need to retry bandwidth reservation later.
250 struct GNUNET_SCHEDULER_Task *rc_delay_task;
253 * Active requests from this neighbour, map of query to 'struct PeerRequest'.
255 struct GNUNET_CONTAINER_MultiHashMap *request_map;
258 * Handle for an active request for transmission to this
259 * peer, or NULL (if core queue was full).
261 struct GNUNET_CORE_TransmitHandle *cth;
264 * Increase in traffic preference still to be submitted
265 * to the core service for this peer.
267 uint64_t inc_preference;
270 * Set to 1 if we're currently in the process of calling
271 * #GNUNET_CORE_notify_transmit_ready() (so while @e cth is
272 * NULL, we should not call notify_transmit_ready for this
275 unsigned int cth_in_progress;
278 * Number of entries in @e delayed_head DLL.
280 unsigned int delay_queue_size;
283 * Respect rating for this peer on disk.
285 uint32_t disk_respect;
288 * Which offset in @e last_p2p_replies will be updated next?
289 * (we go round-robin).
291 unsigned int last_p2p_replies_woff;
294 * Which offset in @e last_client_replies will be updated next?
295 * (we go round-robin).
297 unsigned int last_client_replies_woff;
300 * Current offset into @e last_request_times ring buffer.
302 unsigned int last_request_times_off;
305 * #GNUNET_YES if we did successfully reserve 32k bandwidth,
311 * Function called when the creation of this record is complete.
313 GSF_ConnectedPeerCreationCallback creation_cb;
316 * Closure for @e creation_cb
318 void *creation_cb_cls;
321 * Handle to the PEERSTORE iterate request for peer respect value
323 struct GNUNET_PEERSTORE_IterateContext *respect_iterate_req;
329 * Map from peer identities to `struct GSF_ConnectPeer` entries.
331 static struct GNUNET_CONTAINER_MultiPeerMap *cp_map;
334 * Handle to peerstore service.
336 static struct GNUNET_PEERSTORE_Handle *peerstore;
340 * Update the latency information kept for the given peer.
342 * @param id peer record to update
343 * @param latency current latency value
346 GSF_update_peer_latency_ (const struct GNUNET_PeerIdentity *id,
347 struct GNUNET_TIME_Relative latency)
349 struct GSF_ConnectedPeer *cp;
351 cp = GSF_peer_get_ (id);
353 return; /* we're not yet connected at the core level, ignore */
354 GNUNET_LOAD_value_set_decline (cp->ppd.transmission_delay,
360 * Return the performance data record for the given peer
362 * @param cp peer to query
363 * @return performance data record for the peer
365 struct GSF_PeerPerformanceData *
366 GSF_get_peer_performance_data_ (struct GSF_ConnectedPeer *cp)
373 * Core is ready to transmit to a peer, get the message.
375 * @param cls the `struct GSF_PeerTransmitHandle` of the message
376 * @param size number of bytes core is willing to take
377 * @param buf where to copy the message
378 * @return number of bytes copied to @a buf
381 peer_transmit_ready_cb (void *cls,
387 * Function called by core upon success or failure of our bandwidth reservation request.
389 * @param cls the `struct GSF_ConnectedPeer` of the peer for which we made the request
390 * @param peer identifies the peer
391 * @param amount set to the amount that was actually reserved or unreserved;
392 * either the full requested amount or zero (no partial reservations)
393 * @param res_delay if the reservation could not be satisfied (amount was 0), how
394 * long should the client wait until re-trying?
397 ats_reserve_callback (void *cls,
398 const struct GNUNET_PeerIdentity *peer,
400 struct GNUNET_TIME_Relative res_delay);
404 * If ready (bandwidth reserved), try to schedule transmission via
405 * core for the given handle.
407 * @param pth transmission handle to schedule
410 schedule_transmission (struct GSF_PeerTransmitHandle *pth)
412 struct GSF_ConnectedPeer *cp;
413 struct GNUNET_PeerIdentity target;
416 if ((NULL != cp->cth) || (0 != cp->cth_in_progress))
417 return; /* already done */
418 GNUNET_assert (0 != cp->ppd.pid);
419 GNUNET_PEER_resolve (cp->ppd.pid, &target);
421 if (0 != cp->inc_preference)
423 GNUNET_ATS_performance_change_preference (GSF_ats,
425 GNUNET_ATS_PREFERENCE_BANDWIDTH,
426 (double) cp->inc_preference,
427 GNUNET_ATS_PREFERENCE_END);
428 cp->inc_preference = 0;
431 if ( (GNUNET_YES == pth->is_query) &&
432 (GNUNET_YES != pth->was_reserved) )
434 /* query, need reservation */
435 if (GNUNET_YES != cp->did_reserve)
436 return; /* not ready */
437 cp->did_reserve = GNUNET_NO;
438 /* reservation already done! */
439 pth->was_reserved = GNUNET_YES;
440 cp->rc = GNUNET_ATS_reserve_bandwidth (GSF_ats,
443 &ats_reserve_callback,
447 GNUNET_assert (NULL == cp->cth);
448 cp->cth_in_progress++;
450 GNUNET_CORE_notify_transmit_ready (GSF_core,
452 GNUNET_CORE_PRIO_BACKGROUND,
453 GNUNET_TIME_absolute_get_remaining (pth->timeout),
456 &peer_transmit_ready_cb, cp);
457 GNUNET_assert (NULL != cp->cth);
458 GNUNET_assert (0 < cp->cth_in_progress--);
463 * Core is ready to transmit to a peer, get the message.
465 * @param cls the `struct GSF_PeerTransmitHandle` of the message
466 * @param size number of bytes core is willing to take
467 * @param buf where to copy the message
468 * @return number of bytes copied to @a buf
471 peer_transmit_ready_cb (void *cls,
475 struct GSF_ConnectedPeer *cp = cls;
476 struct GSF_PeerTransmitHandle *pth = cp->pth_head;
477 struct GSF_PeerTransmitHandle *pos;
483 if (pth->size > size)
485 schedule_transmission (pth);
488 if (NULL != pth->timeout_task)
490 GNUNET_SCHEDULER_cancel (pth->timeout_task);
491 pth->timeout_task = NULL;
493 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
496 if (GNUNET_YES == pth->is_query)
498 cp->ppd.last_request_times[(cp->last_request_times_off++) %
499 MAX_QUEUE_PER_PEER] =
500 GNUNET_TIME_absolute_get ();
501 GNUNET_assert (0 < cp->ppd.pending_queries--);
503 else if (GNUNET_NO == pth->is_query)
505 GNUNET_assert (0 < cp->ppd.pending_replies--);
507 GNUNET_LOAD_update (cp->ppd.transmission_delay,
508 GNUNET_TIME_absolute_get_duration
509 (pth->transmission_request_start_time).rel_value_us);
510 ret = pth->gmc (pth->gmc_cls, size, buf);
511 if (NULL != (pos = cp->pth_head))
513 GNUNET_assert (pos != pth);
514 schedule_transmission (pos);
522 * (re)try to reserve bandwidth from the given peer.
524 * @param cls the `struct GSF_ConnectedPeer` to reserve from
525 * @param tc scheduler context
528 retry_reservation (void *cls,
529 const struct GNUNET_SCHEDULER_TaskContext *tc)
531 struct GSF_ConnectedPeer *cp = cls;
532 struct GNUNET_PeerIdentity target;
534 GNUNET_PEER_resolve (cp->ppd.pid, &target);
535 cp->rc_delay_task = NULL;
537 GNUNET_ATS_reserve_bandwidth (GSF_ats,
540 &ats_reserve_callback, cp);
545 * Function called by core upon success or failure of our bandwidth reservation request.
547 * @param cls the `struct GSF_ConnectedPeer` of the peer for which we made the request
548 * @param peer identifies the peer
549 * @param amount set to the amount that was actually reserved or unreserved;
550 * either the full requested amount or zero (no partial reservations)
551 * @param res_delay if the reservation could not be satisfied (amount was 0), how
552 * long should the client wait until re-trying?
555 ats_reserve_callback (void *cls,
556 const struct GNUNET_PeerIdentity *peer,
558 struct GNUNET_TIME_Relative res_delay)
560 struct GSF_ConnectedPeer *cp = cls;
561 struct GSF_PeerTransmitHandle *pth;
563 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
564 "Reserved %d bytes / need to wait %s for reservation\n",
566 GNUNET_STRINGS_relative_time_to_string (res_delay, GNUNET_YES));
571 GNUNET_SCHEDULER_add_delayed (res_delay,
576 cp->did_reserve = GNUNET_YES;
578 if ( (NULL != pth) &&
580 (0 == cp->cth_in_progress) )
582 /* reservation success, try transmission now! */
583 cp->cth_in_progress++;
585 GNUNET_CORE_notify_transmit_ready (GSF_core,
587 GNUNET_CORE_PRIO_BACKGROUND,
588 GNUNET_TIME_absolute_get_remaining (pth->timeout),
591 &peer_transmit_ready_cb,
593 GNUNET_assert (NULL != cp->cth);
594 GNUNET_assert (0 < cp->cth_in_progress--);
600 * Function called by PEERSTORE with peer respect record
602 * @param cls handle to connected peer entry
603 * @param record peerstore record information
604 * @param emsg error message, or NULL if no errors
605 * @return #GNUNET_NO to stop iterating since we only expect 0 or 1 records
608 peer_respect_cb (void *cls,
609 const struct GNUNET_PEERSTORE_Record *record,
612 struct GSF_ConnectedPeer *cp = cls;
614 cp->respect_iterate_req = NULL;
615 if ((NULL != record) && (sizeof (cp->disk_respect) == record->value_size))
616 cp->disk_respect = cp->ppd.respect = *((uint32_t *)record->value);
617 GSF_push_start_ (cp);
618 if (NULL != cp->creation_cb)
619 cp->creation_cb (cp->creation_cb_cls, cp);
625 * A peer connected to us. Setup the connected peer
628 * @param peer identity of peer that connected
629 * @param creation_cb callback function when the record is created.
630 * @param creation_cb_cls closure for @creation_cb
633 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
634 GSF_ConnectedPeerCreationCallback creation_cb,
635 void *creation_cb_cls)
637 struct GSF_ConnectedPeer *cp;
639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
640 "Connected to peer %s\n",
642 cp = GNUNET_new (struct GSF_ConnectedPeer);
643 cp->ppd.pid = GNUNET_PEER_intern (peer);
644 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
646 GNUNET_ATS_reserve_bandwidth (GSF_ats, peer, DBLOCK_SIZE,
647 &ats_reserve_callback, cp);
648 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128, GNUNET_NO);
649 GNUNET_break (GNUNET_OK ==
650 GNUNET_CONTAINER_multipeermap_put (cp_map,
651 GSF_connected_peer_get_identity2_ (cp),
653 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
654 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
655 GNUNET_CONTAINER_multipeermap_size (cp_map),
657 cp->creation_cb = creation_cb;
658 cp->creation_cb_cls = creation_cb_cls;
659 cp->respect_iterate_req =
660 GNUNET_PEERSTORE_iterate (peerstore, "fs", peer, "respect",
661 GNUNET_TIME_UNIT_FOREVER_REL, &peer_respect_cb,
667 * It may be time to re-start migrating content to this
668 * peer. Check, and if so, restart migration.
670 * @param cls the `struct GSF_ConnectedPeer`
671 * @param tc scheduler context
674 revive_migration (void *cls,
675 const struct GNUNET_SCHEDULER_TaskContext *tc)
677 struct GSF_ConnectedPeer *cp = cls;
678 struct GNUNET_TIME_Relative bt;
680 cp->mig_revive_task = NULL;
681 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
682 if (0 != bt.rel_value_us)
684 /* still time left... */
685 cp->mig_revive_task =
686 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
689 GSF_push_start_ (cp);
694 * Get a handle for a connected peer.
696 * @param peer peer's identity
697 * @return NULL if the peer is not currently connected
699 struct GSF_ConnectedPeer *
700 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
704 return GNUNET_CONTAINER_multipeermap_get (cp_map, peer);
709 * Handle P2P "MIGRATION_STOP" message.
711 * @param cls closure, always NULL
712 * @param other the other peer involved (sender or receiver, NULL
713 * for loopback messages where we are both sender and receiver)
714 * @param message the actual message
715 * @return #GNUNET_OK to keep the connection open,
716 * #GNUNET_SYSERR to close it (signal serious error)
719 GSF_handle_p2p_migration_stop_ (void *cls,
720 const struct GNUNET_PeerIdentity *other,
721 const struct GNUNET_MessageHeader *message)
723 struct GSF_ConnectedPeer *cp;
724 const struct MigrationStopMessage *msm;
725 struct GNUNET_TIME_Relative bt;
727 msm = (const struct MigrationStopMessage *) message;
728 cp = GSF_peer_get_ (other);
734 GNUNET_STATISTICS_update (GSF_stats,
735 gettext_noop ("# migration stop messages received"),
737 bt = GNUNET_TIME_relative_ntoh (msm->duration);
738 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
739 _("Migration of content to peer `%s' blocked for %s\n"),
741 GNUNET_STRINGS_relative_time_to_string (bt, GNUNET_YES));
742 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
743 if (NULL == cp->mig_revive_task)
746 cp->mig_revive_task =
747 GNUNET_SCHEDULER_add_delayed (bt,
748 &revive_migration, cp);
755 * Copy reply and free put message.
757 * @param cls the `struct PutMessage`
758 * @param buf_size number of bytes available in @a buf
759 * @param buf where to copy the message, NULL on error (peer disconnect)
760 * @return number of bytes copied to @a buf, can be 0 (without indicating an error)
763 copy_reply (void *cls,
767 struct PutMessage *pm = cls;
772 GNUNET_assert (buf_size >= ntohs (pm->header.size));
773 size = ntohs (pm->header.size);
774 memcpy (buf, pm, size);
775 GNUNET_STATISTICS_update (GSF_stats,
776 gettext_noop ("# replies transmitted to other peers"),
783 GNUNET_STATISTICS_update (GSF_stats,
784 gettext_noop ("# replies dropped"),
794 * Free resources associated with the given peer request.
796 * @param peerreq request to free
797 * @param query associated key for the request
800 free_pending_request (struct PeerRequest *peerreq,
801 const struct GNUNET_HashCode *query)
803 struct GSF_ConnectedPeer *cp = peerreq->cp;
805 if (NULL != peerreq->kill_task)
807 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
808 peerreq->kill_task = NULL;
810 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
812 GNUNET_break (GNUNET_YES ==
813 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
815 GNUNET_free (peerreq);
820 * Cancel all requests associated with the peer.
823 * @param query hash code of the request
824 * @param value the `struct GSF_PendingRequest`
825 * @return #GNUNET_YES (continue to iterate)
828 cancel_pending_request (void *cls,
829 const struct GNUNET_HashCode *query,
832 struct PeerRequest *peerreq = value;
833 struct GSF_PendingRequest *pr = peerreq->pr;
834 struct GSF_PendingRequestData *prd;
836 prd = GSF_pending_request_get_data_ (pr);
837 GSF_pending_request_cancel_ (pr, GNUNET_NO);
838 free_pending_request (peerreq, &prd->query);
844 * Free the given request.
846 * @param cls the request to free
847 * @param tc task context
850 peer_request_destroy (void *cls,
851 const struct GNUNET_SCHEDULER_TaskContext *tc)
853 struct PeerRequest *peerreq = cls;
854 struct GSF_PendingRequest *pr = peerreq->pr;
855 struct GSF_PendingRequestData *prd;
857 peerreq->kill_task = NULL;
858 prd = GSF_pending_request_get_data_ (pr);
859 cancel_pending_request (NULL, &prd->query, peerreq);
864 * The artificial delay is over, transmit the message now.
866 * @param cls the `struct GSF_DelayedHandle` with the message
867 * @param tc scheduler context
870 transmit_delayed_now (void *cls,
871 const struct GNUNET_SCHEDULER_TaskContext *tc)
873 struct GSF_DelayedHandle *dh = cls;
874 struct GSF_ConnectedPeer *cp = dh->cp;
876 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
879 cp->delay_queue_size--;
880 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
882 GNUNET_free (dh->pm);
886 (void) GSF_peer_transmit_ (cp,
898 * Get the randomized delay a response should be subjected to.
900 * @return desired delay
902 static struct GNUNET_TIME_Relative
903 get_randomized_delay ()
905 struct GNUNET_TIME_Relative ret;
908 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
909 GNUNET_CRYPTO_random_u32
910 (GNUNET_CRYPTO_QUALITY_WEAK,
911 2 * GSF_avg_latency.rel_value_us + 1));
912 #if INSANE_STATISTICS
913 GNUNET_STATISTICS_update (GSF_stats,
915 ("# artificial delays introduced (ms)"),
916 ret.rel_value_us / 1000LL, GNUNET_NO);
923 * Handle a reply to a pending request. Also called if a request
924 * expires (then with data == NULL). The handler may be called
925 * many times (depending on the request type), but will not be
926 * called during or after a call to GSF_pending_request_cancel
927 * and will also not be called anymore after a call signalling
930 * @param cls `struct PeerRequest` this is an answer for
931 * @param eval evaluation of the result
932 * @param pr handle to the original pending request
933 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
934 * @param expiration when does @a data expire?
935 * @param last_transmission when did we last transmit a request for this block
936 * @param type type of the block
937 * @param data response data, NULL on request expiration
938 * @param data_len number of bytes in @a data
941 handle_p2p_reply (void *cls,
942 enum GNUNET_BLOCK_EvaluationResult eval,
943 struct GSF_PendingRequest *pr,
944 uint32_t reply_anonymity_level,
945 struct GNUNET_TIME_Absolute expiration,
946 struct GNUNET_TIME_Absolute last_transmission,
947 enum GNUNET_BLOCK_Type type,
951 struct PeerRequest *peerreq = cls;
952 struct GSF_ConnectedPeer *cp = peerreq->cp;
953 struct GSF_PendingRequestData *prd;
954 struct PutMessage *pm;
957 GNUNET_assert (data_len + sizeof (struct PutMessage) <
958 GNUNET_SERVER_MAX_MESSAGE_SIZE);
959 GNUNET_assert (peerreq->pr == pr);
960 prd = GSF_pending_request_get_data_ (pr);
963 free_pending_request (peerreq, &prd->query);
966 GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
967 if ((prd->type != type) && (GNUNET_BLOCK_TYPE_ANY != prd->type))
969 GNUNET_STATISTICS_update (GSF_stats,
971 ("# replies dropped due to type mismatch"),
975 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
976 "Transmitting result for query `%s' to peer\n",
977 GNUNET_h2s (&prd->query));
978 GNUNET_STATISTICS_update (GSF_stats,
979 gettext_noop ("# replies received for other peers"),
981 msize = sizeof (struct PutMessage) + data_len;
982 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
987 if ((UINT32_MAX != reply_anonymity_level) && (reply_anonymity_level > 1))
989 if (reply_anonymity_level - 1 > GSF_cover_content_count)
991 GNUNET_STATISTICS_update (GSF_stats,
993 ("# replies dropped due to insufficient cover traffic"),
997 GSF_cover_content_count -= (reply_anonymity_level - 1);
1000 pm = GNUNET_malloc (msize);
1001 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
1002 pm->header.size = htons (msize);
1003 pm->type = htonl (type);
1004 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
1005 memcpy (&pm[1], data, data_len);
1006 if ( (UINT32_MAX != reply_anonymity_level) &&
1007 (0 != reply_anonymity_level) &&
1008 (GNUNET_YES == GSF_enable_randomized_delays) )
1010 struct GSF_DelayedHandle *dh;
1012 dh = GNUNET_new (struct GSF_DelayedHandle);
1016 GNUNET_CONTAINER_DLL_insert (cp->delayed_head,
1019 cp->delay_queue_size++;
1021 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
1022 &transmit_delayed_now,
1027 (void) GSF_peer_transmit_ (cp,
1035 if (GNUNET_BLOCK_EVALUATION_OK_LAST != eval)
1037 if (NULL == peerreq->kill_task)
1039 GNUNET_STATISTICS_update (GSF_stats,
1041 ("# P2P searches destroyed due to ultimate reply"),
1043 peerreq->kill_task =
1044 GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
1050 * Increase the peer's respect by a value.
1052 * @param cp which peer to change the respect value on
1053 * @param value is the int value by which the
1054 * peer's credit is to be increased or decreased
1055 * @returns the actual change in respect (positive or negative)
1058 change_peer_respect (struct GSF_ConnectedPeer *cp, int value)
1062 GNUNET_assert (NULL != cp);
1065 if (cp->ppd.respect + value < cp->ppd.respect)
1067 value = UINT32_MAX - cp->ppd.respect;
1068 cp->ppd.respect = UINT32_MAX;
1071 cp->ppd.respect += value;
1075 if (cp->ppd.respect < -value)
1077 value = -cp->ppd.respect;
1078 cp->ppd.respect = 0;
1081 cp->ppd.respect += value;
1088 * We've received a request with the specified priority. Bound it
1089 * according to how much we respect the given peer.
1091 * @param prio_in requested priority
1092 * @param cp the peer making the request
1093 * @return effective priority
1096 bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
1098 #define N ((double)128.0)
1103 ld = GSF_test_get_load_too_high_ (0);
1104 if (GNUNET_SYSERR == ld)
1106 #if INSANE_STATISTICS
1107 GNUNET_STATISTICS_update (GSF_stats,
1109 ("# requests done for free (low load)"), 1,
1112 return 0; /* excess resources */
1114 if (prio_in > INT32_MAX)
1115 prio_in = INT32_MAX;
1116 ret = -change_peer_respect (cp, -(int) prio_in);
1119 if (ret > GSF_current_priorities + N)
1120 rret = GSF_current_priorities + N;
1123 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1125 if ((GNUNET_YES == ld) && (ret > 0))
1127 /* try with charging */
1128 ld = GSF_test_get_load_too_high_ (ret);
1130 if (GNUNET_YES == ld)
1132 GNUNET_STATISTICS_update (GSF_stats,
1134 ("# request dropped, priority insufficient"), 1,
1137 change_peer_respect (cp, (int) ret);
1138 return -1; /* not enough resources */
1142 GNUNET_STATISTICS_update (GSF_stats,
1144 ("# requests done for a price (normal load)"), 1,
1153 * The priority level imposes a bound on the maximum
1154 * value for the ttl that can be requested.
1156 * @param ttl_in requested ttl
1157 * @param prio given priority
1158 * @return ttl_in if ttl_in is below the limit,
1159 * otherwise the ttl-limit for the given priority
1162 bound_ttl (int32_t ttl_in, uint32_t prio)
1164 unsigned long long allowed;
1168 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1169 if (ttl_in > allowed)
1171 if (allowed >= (1 << 30))
1180 * Handle P2P "QUERY" message. Creates the pending request entry
1181 * and sets up all of the data structures to that we will
1182 * process replies properly. Does not initiate forwarding or
1183 * local database lookups.
1185 * @param other the other peer involved (sender or receiver, NULL
1186 * for loopback messages where we are both sender and receiver)
1187 * @param message the actual message
1188 * @return pending request handle, NULL on error
1190 struct GSF_PendingRequest *
1191 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1192 const struct GNUNET_MessageHeader *message)
1194 struct PeerRequest *peerreq;
1195 struct GSF_PendingRequest *pr;
1196 struct GSF_PendingRequestData *prd;
1197 struct GSF_ConnectedPeer *cp;
1198 struct GSF_ConnectedPeer *cps;
1199 const struct GNUNET_PeerIdentity *target;
1200 enum GSF_PendingRequestOptions options;
1202 const struct GetMessage *gm;
1204 const struct GNUNET_PeerIdentity *opt;
1207 uint32_t ttl_decrement;
1210 enum GNUNET_BLOCK_Type type;
1211 GNUNET_PEER_Id spid;
1213 msize = ntohs (message->size);
1214 if (msize < sizeof (struct GetMessage))
1216 GNUNET_break_op (0);
1219 GNUNET_STATISTICS_update (GSF_stats,
1221 ("# GET requests received (from other peers)"),
1224 gm = (const struct GetMessage *) message;
1225 type = ntohl (gm->type);
1226 bm = ntohl (gm->hash_bitmap);
1234 if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_PeerIdentity))
1236 GNUNET_break_op (0);
1239 opt = (const struct GNUNET_PeerIdentity *) &gm[1];
1240 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_PeerIdentity);
1241 /* bfsize must be power of 2, check! */
1242 if (0 != ((bfsize - 1) & bfsize))
1244 GNUNET_break_op (0);
1247 GSF_cover_query_count++;
1248 bm = ntohl (gm->hash_bitmap);
1250 cps = GSF_peer_get_ (other);
1253 /* peer must have just disconnected */
1254 GNUNET_STATISTICS_update (GSF_stats,
1256 ("# requests dropped due to initiator not being connected"),
1260 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1261 cp = GSF_peer_get_ (&opt[bits++]);
1266 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1267 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1268 "Failed to find RETURN-TO peer `%s' in connection set. Dropping query.\n",
1269 GNUNET_i2s (&opt[bits - 1]));
1272 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1273 "Failed to find peer `%s' in connection set. Dropping query.\n",
1274 GNUNET_i2s (other));
1275 GNUNET_STATISTICS_update (GSF_stats,
1277 ("# requests dropped due to missing reverse route"),
1282 if (cp->ppd.pending_replies + cp->delay_queue_size > MAX_QUEUE_PER_PEER)
1284 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1285 "Peer `%s' has too many replies queued already. Dropping query.\n",
1286 GNUNET_i2s (other));
1287 GNUNET_STATISTICS_update (GSF_stats,
1288 gettext_noop ("# requests dropped due to full reply queue"),
1293 /* note that we can really only check load here since otherwise
1294 * peers could find out that we are overloaded by not being
1295 * disconnected after sending us a malformed query... */
1296 priority = bound_priority (ntohl (gm->priority),
1300 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1301 "Dropping query from `%s', this peer is too busy.\n",
1302 GNUNET_i2s (other));
1305 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1306 "Received request for `%s' of type %u from peer `%s' with flags %u\n",
1307 GNUNET_h2s (&gm->query),
1308 (unsigned int) type,
1313 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? (&opt[bits++]) : NULL;
1314 options = GSF_PRO_DEFAULTS;
1316 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
1317 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1318 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value_us * 2 +
1319 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1321 /* don't have BW to send to peer, or would likely take longer than we have for it,
1322 * so at best indirect the query */
1324 options |= GSF_PRO_FORWARD_ONLY;
1325 spid = GNUNET_PEER_intern (other);
1326 GNUNET_assert (0 != spid);
1328 ttl = bound_ttl (ntohl (gm->ttl), priority);
1329 /* decrement ttl (always) */
1331 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1333 if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
1335 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1336 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1337 GNUNET_i2s (other), ttl, ttl_decrement);
1338 GNUNET_STATISTICS_update (GSF_stats,
1340 ("# requests dropped due TTL underflow"), 1,
1342 /* integer underflow => drop (should be very rare)! */
1345 ttl -= ttl_decrement;
1347 /* test if the request already exists */
1348 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map,
1350 if (NULL != peerreq)
1353 prd = GSF_pending_request_get_data_ (pr);
1354 if (prd->type == type)
1356 if (prd->ttl.abs_value_us >= GNUNET_TIME_absolute_get ().abs_value_us + ttl * 1000LL)
1358 /* existing request has higher TTL, drop new one! */
1359 prd->priority += priority;
1360 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1361 "Have existing request with higher TTL, dropping new request.\n",
1362 GNUNET_i2s (other));
1363 GNUNET_STATISTICS_update (GSF_stats,
1365 ("# requests dropped due to higher-TTL request"),
1369 /* existing request has lower TTL, drop old one! */
1370 priority += prd->priority;
1371 GSF_pending_request_cancel_ (pr, GNUNET_YES);
1372 free_pending_request (peerreq, &gm->query);
1376 peerreq = GNUNET_new (struct PeerRequest);
1378 pr = GSF_pending_request_create_ (options,
1383 ? (const char *) &opt[bits]
1386 ntohl (gm->filter_mutator),
1388 (uint32_t) priority,
1391 GNUNET_PEER_intern (other),
1392 NULL, 0, /* replies_seen */
1393 &handle_p2p_reply, peerreq);
1394 GNUNET_assert (NULL != pr);
1396 GNUNET_break (GNUNET_OK ==
1397 GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
1399 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1400 GNUNET_STATISTICS_update (GSF_stats,
1402 ("# P2P query messages received and processed"), 1,
1404 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
1411 * Function called if there has been a timeout trying to satisfy
1412 * a transmission request.
1414 * @param cls the `struct GSF_PeerTransmitHandle` of the request
1415 * @param tc scheduler context
1418 peer_transmit_timeout (void *cls,
1419 const struct GNUNET_SCHEDULER_TaskContext *tc)
1421 struct GSF_PeerTransmitHandle *pth = cls;
1422 struct GSF_ConnectedPeer *cp;
1424 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1425 "Timeout trying to transmit to other peer\n");
1426 pth->timeout_task = NULL;
1428 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1431 if (GNUNET_YES == pth->is_query)
1432 GNUNET_assert (0 < cp->ppd.pending_queries--);
1433 else if (GNUNET_NO == pth->is_query)
1434 GNUNET_assert (0 < cp->ppd.pending_replies--);
1435 GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
1436 if (NULL != cp->cth)
1438 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1441 pth->gmc (pth->gmc_cls, 0, NULL);
1442 GNUNET_assert (0 == cp->cth_in_progress);
1448 * Transmit a message to the given peer as soon as possible.
1449 * If the peer disconnects before the transmission can happen,
1450 * the callback is invoked with a `NULL` @a buffer.
1452 * @param cp target peer
1453 * @param is_query is this a query (#GNUNET_YES) or content (#GNUNET_NO) or neither (#GNUNET_SYSERR)
1454 * @param priority how important is this request?
1455 * @param timeout when does this request timeout (call gmc with error)
1456 * @param size number of bytes we would like to send to the peer
1457 * @param gmc function to call to get the message
1458 * @param gmc_cls closure for @a gmc
1459 * @return handle to cancel request
1461 struct GSF_PeerTransmitHandle *
1462 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
1465 struct GNUNET_TIME_Relative timeout,
1467 GSF_GetMessageCallback gmc, void *gmc_cls)
1469 struct GSF_PeerTransmitHandle *pth;
1470 struct GSF_PeerTransmitHandle *pos;
1471 struct GSF_PeerTransmitHandle *prev;
1473 pth = GNUNET_new (struct GSF_PeerTransmitHandle);
1474 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1475 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1477 pth->gmc_cls = gmc_cls;
1479 pth->is_query = is_query;
1480 pth->priority = priority;
1482 /* insertion sort (by priority, descending) */
1485 while ((NULL != pos) && (pos->priority > priority))
1490 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head,
1494 if (GNUNET_YES == is_query)
1495 cp->ppd.pending_queries++;
1496 else if (GNUNET_NO == is_query)
1497 cp->ppd.pending_replies++;
1499 = GNUNET_SCHEDULER_add_delayed (timeout,
1500 &peer_transmit_timeout,
1502 schedule_transmission (pth);
1508 * Cancel an earlier request for transmission.
1510 * @param pth request to cancel
1513 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1515 struct GSF_ConnectedPeer *cp;
1517 if (NULL != pth->timeout_task)
1519 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1520 pth->timeout_task = NULL;
1523 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1526 if (GNUNET_YES == pth->is_query)
1527 GNUNET_assert (0 < cp->ppd.pending_queries--);
1528 else if (GNUNET_NO == pth->is_query)
1529 GNUNET_assert (0 < cp->ppd.pending_replies--);
1535 * Report on receiving a reply; update the performance record of the given peer.
1537 * @param cp responding peer (will be updated)
1538 * @param request_time time at which the original query was transmitted
1539 * @param request_priority priority of the original request
1542 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1543 struct GNUNET_TIME_Absolute request_time,
1544 uint32_t request_priority)
1546 struct GNUNET_TIME_Relative delay;
1548 delay = GNUNET_TIME_absolute_get_duration (request_time);
1549 cp->ppd.avg_reply_delay.rel_value_us =
1550 (cp->ppd.avg_reply_delay.rel_value_us * (RUNAVG_DELAY_N - 1) +
1551 delay.rel_value_us) / RUNAVG_DELAY_N;
1552 cp->ppd.avg_priority =
1553 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1554 request_priority) / RUNAVG_DELAY_N;
1559 * Report on receiving a reply in response to an initiating client.
1560 * Remember that this peer is good for this client.
1562 * @param cp responding peer (will be updated)
1563 * @param initiator_client local client on responsible for query
1566 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1567 struct GSF_LocalClient *initiator_client)
1569 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1570 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1575 * Report on receiving a reply in response to an initiating peer.
1576 * Remember that this peer is good for this initiating peer.
1578 * @param cp responding peer (will be updated)
1579 * @param initiator_peer other peer responsible for query
1582 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1583 const struct GSF_ConnectedPeer *initiator_peer)
1587 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1588 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1589 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1590 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1591 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1596 * Write peer-respect information to a file - flush the buffer entry!
1599 * @param key peer identity
1600 * @param value the `struct GSF_ConnectedPeer` to flush
1601 * @return #GNUNET_OK to continue iteration
1604 flush_respect (void *cls,
1605 const struct GNUNET_PeerIdentity *key,
1608 struct GSF_ConnectedPeer *cp = value;
1609 struct GNUNET_PeerIdentity pid;
1611 if (cp->ppd.respect == cp->disk_respect)
1612 return GNUNET_OK; /* unchanged */
1613 GNUNET_assert (0 != cp->ppd.pid);
1614 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1615 GNUNET_PEERSTORE_store (peerstore, "fs", &pid, "respect", &cp->ppd.respect,
1616 sizeof (cp->ppd.respect),
1617 GNUNET_TIME_UNIT_FOREVER_ABS,
1618 GNUNET_PEERSTORE_STOREOPTION_REPLACE, NULL, NULL);
1624 * A peer disconnected from us. Tear down the connected peer
1628 * @param peer identity of peer that connected
1631 GSF_peer_disconnect_handler_ (void *cls,
1632 const struct GNUNET_PeerIdentity *peer)
1634 struct GSF_ConnectedPeer *cp;
1635 struct GSF_PeerTransmitHandle *pth;
1636 struct GSF_DelayedHandle *dh;
1638 cp = GSF_peer_get_ (peer);
1640 return; /* must have been disconnect from core with
1641 * 'peer' == my_id, ignore */
1642 flush_respect (NULL, peer, cp);
1643 GNUNET_assert (GNUNET_YES ==
1644 GNUNET_CONTAINER_multipeermap_remove (cp_map,
1647 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
1648 GNUNET_CONTAINER_multipeermap_size (cp_map),
1650 if (NULL != cp->respect_iterate_req)
1652 GNUNET_PEERSTORE_iterate_cancel (cp->respect_iterate_req);
1653 cp->respect_iterate_req = NULL;
1655 if (NULL != cp->migration_pth)
1657 GSF_peer_transmit_cancel_ (cp->migration_pth);
1658 cp->migration_pth = NULL;
1662 GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
1665 if (NULL != cp->rc_delay_task)
1667 GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
1668 cp->rc_delay_task = NULL;
1670 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1671 &cancel_pending_request, cp);
1672 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1673 cp->request_map = NULL;
1674 GSF_plan_notify_peer_disconnect_ (cp);
1675 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1676 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1677 memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
1678 GSF_push_stop_ (cp);
1679 if (NULL != cp->cth)
1681 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1684 GNUNET_assert (0 == cp->cth_in_progress);
1685 while (NULL != (pth = cp->pth_head))
1687 if (pth->timeout_task != NULL)
1689 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1690 pth->timeout_task = NULL;
1692 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1695 if (GNUNET_YES == pth->is_query)
1696 GNUNET_assert (0 < cp->ppd.pending_queries--);
1697 else if (GNUNET_NO == pth->is_query)
1698 GNUNET_assert (0 < cp->ppd.pending_replies--);
1699 pth->gmc (pth->gmc_cls, 0, NULL);
1702 while (NULL != (dh = cp->delayed_head))
1704 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
1707 cp->delay_queue_size--;
1708 GNUNET_SCHEDULER_cancel (dh->delay_task);
1709 GNUNET_free (dh->pm);
1712 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1713 if (NULL != cp->mig_revive_task)
1715 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1716 cp->mig_revive_task = NULL;
1718 GNUNET_break (0 == cp->ppd.pending_queries);
1719 GNUNET_break (0 == cp->ppd.pending_replies);
1725 * Closure for #call_iterator().
1727 struct IterationContext
1730 * Function to call on each entry.
1732 GSF_ConnectedPeerIterator it;
1735 * Closure for @e it.
1742 * Function that calls the callback for each peer.
1744 * @param cls the `struct IterationContext *`
1745 * @param key identity of the peer
1746 * @param value the `struct GSF_ConnectedPeer *`
1747 * @return #GNUNET_YES to continue iteration
1750 call_iterator (void *cls,
1751 const struct GNUNET_PeerIdentity *key,
1754 struct IterationContext *ic = cls;
1755 struct GSF_ConnectedPeer *cp = value;
1765 * Iterate over all connected peers.
1767 * @param it function to call for each peer
1768 * @param it_cls closure for @a it
1771 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it,
1774 struct IterationContext ic;
1778 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1785 * Obtain the identity of a connected peer.
1787 * @param cp peer to get identity of
1788 * @param id identity to set (written to)
1791 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1792 struct GNUNET_PeerIdentity *id)
1794 GNUNET_assert (0 != cp->ppd.pid);
1795 GNUNET_PEER_resolve (cp->ppd.pid, id);
1800 * Obtain the identity of a connected peer.
1802 * @param cp peer to get identity of
1803 * @return reference to peer identity, valid until peer disconnects (!)
1805 const struct GNUNET_PeerIdentity *
1806 GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp)
1808 GNUNET_assert (0 != cp->ppd.pid);
1809 return GNUNET_PEER_resolve2 (cp->ppd.pid);
1814 * Assemble a migration stop message for transmission.
1816 * @param cls the `struct GSF_ConnectedPeer` to use
1817 * @param size number of bytes we're allowed to write to @a buf
1818 * @param buf where to copy the message
1819 * @return number of bytes copied to @a buf
1822 create_migration_stop_message (void *cls,
1826 struct GSF_ConnectedPeer *cp = cls;
1827 struct MigrationStopMessage msm;
1829 cp->migration_pth = NULL;
1832 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1833 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1834 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1835 msm.reserved = htonl (0);
1837 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1838 (cp->last_migration_block));
1839 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1840 GNUNET_STATISTICS_update (GSF_stats,
1841 gettext_noop ("# migration stop messages sent"),
1843 return sizeof (struct MigrationStopMessage);
1848 * Ask a peer to stop migrating data to us until the given point
1851 * @param cp peer to ask
1852 * @param block_time until when to block
1855 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1856 struct GNUNET_TIME_Absolute block_time)
1858 if (cp->last_migration_block.abs_value_us > block_time.abs_value_us)
1860 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1861 "Migration already blocked for another %s\n",
1862 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining
1863 (cp->last_migration_block), GNUNET_YES));
1864 return; /* already blocked */
1866 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %s\n",
1867 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (block_time),
1869 cp->last_migration_block = block_time;
1870 if (NULL != cp->migration_pth)
1871 GSF_peer_transmit_cancel_ (cp->migration_pth);
1873 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1874 GNUNET_TIME_UNIT_FOREVER_REL,
1875 sizeof (struct MigrationStopMessage),
1876 &create_migration_stop_message, cp);
1881 * Notify core about a preference we have for the given peer
1882 * (to allocate more resources towards it). The change will
1883 * be communicated the next time we reserve bandwidth with
1884 * core (not instantly).
1886 * @param cp peer to reserve bandwidth from
1887 * @param pref preference change
1890 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1893 cp->inc_preference += pref;
1898 * Call this method periodically to flush respect information to disk.
1900 * @param cls closure, not used
1901 * @param tc task context, not used
1904 cron_flush_respect (void *cls,
1905 const struct GNUNET_SCHEDULER_TaskContext *tc)
1909 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1910 &flush_respect, NULL);
1913 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1915 GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
1916 GNUNET_SCHEDULER_PRIORITY_HIGH,
1917 &cron_flush_respect, NULL);
1922 * Initialize peer management subsystem.
1925 GSF_connected_peer_init_ ()
1927 cp_map = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
1928 peerstore = GNUNET_PEERSTORE_connect (GSF_cfg);
1929 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1930 &cron_flush_respect, NULL);
1935 * Iterator to free peer entries.
1937 * @param cls closure, unused
1938 * @param key current key code
1939 * @param value value in the hash map (peer entry)
1940 * @return #GNUNET_YES (we should continue to iterate)
1943 clean_peer (void *cls,
1944 const struct GNUNET_PeerIdentity *key,
1947 GSF_peer_disconnect_handler_ (NULL, key);
1953 * Shutdown peer management subsystem.
1956 GSF_connected_peer_done_ ()
1958 cron_flush_respect (NULL, NULL);
1959 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1961 GNUNET_CONTAINER_multipeermap_destroy (cp_map);
1963 GNUNET_PEERSTORE_disconnect (peerstore, GNUNET_YES);
1968 * Iterator to remove references to LC entry.
1970 * @param cls the `struct GSF_LocalClient *` to look for
1971 * @param key current key code
1972 * @param value value in the hash map (peer entry)
1973 * @return #GNUNET_YES (we should continue to iterate)
1976 clean_local_client (void *cls,
1977 const struct GNUNET_PeerIdentity *key,
1980 const struct GSF_LocalClient *lc = cls;
1981 struct GSF_ConnectedPeer *cp = value;
1984 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
1985 if (cp->ppd.last_client_replies[i] == lc)
1986 cp->ppd.last_client_replies[i] = NULL;
1992 * Notification that a local client disconnected. Clean up all of our
1993 * references to the given handle.
1995 * @param lc handle to the local client (henceforth invalid)
1998 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
2001 return; /* already cleaned up */
2002 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_local_client,
2007 /* end of gnunet-service-fs_cp.c */