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., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, 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 GNUNET_assert (NULL != cp->respect_iterate_req);
615 cp->respect_iterate_req = NULL;
616 if ((NULL != record) && (sizeof (cp->disk_respect) == record->value_size))
617 cp->disk_respect = cp->ppd.respect = *((uint32_t *)record->value);
618 GSF_push_start_ (cp);
619 if (NULL != cp->creation_cb)
620 cp->creation_cb (cp->creation_cb_cls, cp);
626 * A peer connected to us. Setup the connected peer
629 * @param peer identity of peer that connected
630 * @param creation_cb callback function when the record is created.
631 * @param creation_cb_cls closure for @creation_cb
634 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
635 GSF_ConnectedPeerCreationCallback creation_cb,
636 void *creation_cb_cls)
638 struct GSF_ConnectedPeer *cp;
640 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
641 "Connected to peer %s\n",
643 cp = GNUNET_new (struct GSF_ConnectedPeer);
644 cp->ppd.pid = GNUNET_PEER_intern (peer);
645 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
647 GNUNET_ATS_reserve_bandwidth (GSF_ats, peer, DBLOCK_SIZE,
648 &ats_reserve_callback, cp);
649 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128,
651 GNUNET_break (GNUNET_OK ==
652 GNUNET_CONTAINER_multipeermap_put (cp_map,
653 GSF_connected_peer_get_identity2_ (cp),
655 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
656 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
657 GNUNET_CONTAINER_multipeermap_size (cp_map),
659 cp->creation_cb = creation_cb;
660 cp->creation_cb_cls = creation_cb_cls;
661 cp->respect_iterate_req =
662 GNUNET_PEERSTORE_iterate (peerstore, "fs",
664 GNUNET_TIME_UNIT_FOREVER_REL,
671 * It may be time to re-start migrating content to this
672 * peer. Check, and if so, restart migration.
674 * @param cls the `struct GSF_ConnectedPeer`
675 * @param tc scheduler context
678 revive_migration (void *cls,
679 const struct GNUNET_SCHEDULER_TaskContext *tc)
681 struct GSF_ConnectedPeer *cp = cls;
682 struct GNUNET_TIME_Relative bt;
684 cp->mig_revive_task = NULL;
685 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
686 if (0 != bt.rel_value_us)
688 /* still time left... */
689 cp->mig_revive_task =
690 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
693 GSF_push_start_ (cp);
698 * Get a handle for a connected peer.
700 * @param peer peer's identity
701 * @return NULL if the peer is not currently connected
703 struct GSF_ConnectedPeer *
704 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
708 return GNUNET_CONTAINER_multipeermap_get (cp_map, peer);
713 * Handle P2P "MIGRATION_STOP" message.
715 * @param cls closure, always NULL
716 * @param other the other peer involved (sender or receiver, NULL
717 * for loopback messages where we are both sender and receiver)
718 * @param message the actual message
719 * @return #GNUNET_OK to keep the connection open,
720 * #GNUNET_SYSERR to close it (signal serious error)
723 GSF_handle_p2p_migration_stop_ (void *cls,
724 const struct GNUNET_PeerIdentity *other,
725 const struct GNUNET_MessageHeader *message)
727 struct GSF_ConnectedPeer *cp;
728 const struct MigrationStopMessage *msm;
729 struct GNUNET_TIME_Relative bt;
731 msm = (const struct MigrationStopMessage *) message;
732 cp = GSF_peer_get_ (other);
738 GNUNET_STATISTICS_update (GSF_stats,
739 gettext_noop ("# migration stop messages received"),
741 bt = GNUNET_TIME_relative_ntoh (msm->duration);
742 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
743 _("Migration of content to peer `%s' blocked for %s\n"),
745 GNUNET_STRINGS_relative_time_to_string (bt, GNUNET_YES));
746 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
747 if ( (NULL == cp->mig_revive_task) &&
748 (NULL == cp->respect_iterate_req) )
751 cp->mig_revive_task =
752 GNUNET_SCHEDULER_add_delayed (bt,
753 &revive_migration, cp);
760 * Copy reply and free put message.
762 * @param cls the `struct PutMessage`
763 * @param buf_size number of bytes available in @a buf
764 * @param buf where to copy the message, NULL on error (peer disconnect)
765 * @return number of bytes copied to @a buf, can be 0 (without indicating an error)
768 copy_reply (void *cls,
772 struct PutMessage *pm = cls;
777 GNUNET_assert (buf_size >= ntohs (pm->header.size));
778 size = ntohs (pm->header.size);
779 memcpy (buf, pm, size);
780 GNUNET_STATISTICS_update (GSF_stats,
781 gettext_noop ("# replies transmitted to other peers"),
788 GNUNET_STATISTICS_update (GSF_stats,
789 gettext_noop ("# replies dropped"),
799 * Free resources associated with the given peer request.
801 * @param peerreq request to free
802 * @param query associated key for the request
805 free_pending_request (struct PeerRequest *peerreq,
806 const struct GNUNET_HashCode *query)
808 struct GSF_ConnectedPeer *cp = peerreq->cp;
810 if (NULL != peerreq->kill_task)
812 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
813 peerreq->kill_task = NULL;
815 GNUNET_STATISTICS_update (GSF_stats,
816 gettext_noop ("# P2P searches active"),
819 GNUNET_break (GNUNET_YES ==
820 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
823 GNUNET_free (peerreq);
828 * Cancel all requests associated with the peer.
831 * @param query hash code of the request
832 * @param value the `struct GSF_PendingRequest`
833 * @return #GNUNET_YES (continue to iterate)
836 cancel_pending_request (void *cls,
837 const struct GNUNET_HashCode *query,
840 struct PeerRequest *peerreq = value;
841 struct GSF_PendingRequest *pr = peerreq->pr;
842 struct GSF_PendingRequestData *prd;
844 prd = GSF_pending_request_get_data_ (pr);
845 GSF_pending_request_cancel_ (pr, GNUNET_NO);
846 free_pending_request (peerreq, &prd->query);
852 * Free the given request.
854 * @param cls the request to free
855 * @param tc task context
858 peer_request_destroy (void *cls,
859 const struct GNUNET_SCHEDULER_TaskContext *tc)
861 struct PeerRequest *peerreq = cls;
862 struct GSF_PendingRequest *pr = peerreq->pr;
863 struct GSF_PendingRequestData *prd;
865 peerreq->kill_task = NULL;
866 prd = GSF_pending_request_get_data_ (pr);
867 cancel_pending_request (NULL, &prd->query, peerreq);
872 * The artificial delay is over, transmit the message now.
874 * @param cls the `struct GSF_DelayedHandle` with the message
875 * @param tc scheduler context
878 transmit_delayed_now (void *cls,
879 const struct GNUNET_SCHEDULER_TaskContext *tc)
881 struct GSF_DelayedHandle *dh = cls;
882 struct GSF_ConnectedPeer *cp = dh->cp;
884 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
887 cp->delay_queue_size--;
888 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
890 GNUNET_free (dh->pm);
894 (void) GSF_peer_transmit_ (cp,
906 * Get the randomized delay a response should be subjected to.
908 * @return desired delay
910 static struct GNUNET_TIME_Relative
911 get_randomized_delay ()
913 struct GNUNET_TIME_Relative ret;
916 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
917 GNUNET_CRYPTO_random_u32
918 (GNUNET_CRYPTO_QUALITY_WEAK,
919 2 * GSF_avg_latency.rel_value_us + 1));
920 #if INSANE_STATISTICS
921 GNUNET_STATISTICS_update (GSF_stats,
923 ("# artificial delays introduced (ms)"),
924 ret.rel_value_us / 1000LL, GNUNET_NO);
931 * Handle a reply to a pending request. Also called if a request
932 * expires (then with data == NULL). The handler may be called
933 * many times (depending on the request type), but will not be
934 * called during or after a call to GSF_pending_request_cancel
935 * and will also not be called anymore after a call signalling
938 * @param cls `struct PeerRequest` this is an answer for
939 * @param eval evaluation of the result
940 * @param pr handle to the original pending request
941 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
942 * @param expiration when does @a data expire?
943 * @param last_transmission when did we last transmit a request for this block
944 * @param type type of the block
945 * @param data response data, NULL on request expiration
946 * @param data_len number of bytes in @a data
949 handle_p2p_reply (void *cls,
950 enum GNUNET_BLOCK_EvaluationResult eval,
951 struct GSF_PendingRequest *pr,
952 uint32_t reply_anonymity_level,
953 struct GNUNET_TIME_Absolute expiration,
954 struct GNUNET_TIME_Absolute last_transmission,
955 enum GNUNET_BLOCK_Type type,
959 struct PeerRequest *peerreq = cls;
960 struct GSF_ConnectedPeer *cp = peerreq->cp;
961 struct GSF_PendingRequestData *prd;
962 struct PutMessage *pm;
965 GNUNET_assert (data_len + sizeof (struct PutMessage) <
966 GNUNET_SERVER_MAX_MESSAGE_SIZE);
967 GNUNET_assert (peerreq->pr == pr);
968 prd = GSF_pending_request_get_data_ (pr);
971 free_pending_request (peerreq, &prd->query);
974 GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
975 if ((prd->type != type) && (GNUNET_BLOCK_TYPE_ANY != prd->type))
977 GNUNET_STATISTICS_update (GSF_stats,
979 ("# replies dropped due to type mismatch"),
983 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
984 "Transmitting result for query `%s' to peer\n",
985 GNUNET_h2s (&prd->query));
986 GNUNET_STATISTICS_update (GSF_stats,
987 gettext_noop ("# replies received for other peers"),
989 msize = sizeof (struct PutMessage) + data_len;
990 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
995 if ((UINT32_MAX != reply_anonymity_level) && (reply_anonymity_level > 1))
997 if (reply_anonymity_level - 1 > GSF_cover_content_count)
999 GNUNET_STATISTICS_update (GSF_stats,
1001 ("# replies dropped due to insufficient cover traffic"),
1005 GSF_cover_content_count -= (reply_anonymity_level - 1);
1008 pm = GNUNET_malloc (msize);
1009 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
1010 pm->header.size = htons (msize);
1011 pm->type = htonl (type);
1012 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
1013 memcpy (&pm[1], data, data_len);
1014 if ( (UINT32_MAX != reply_anonymity_level) &&
1015 (0 != reply_anonymity_level) &&
1016 (GNUNET_YES == GSF_enable_randomized_delays) )
1018 struct GSF_DelayedHandle *dh;
1020 dh = GNUNET_new (struct GSF_DelayedHandle);
1024 GNUNET_CONTAINER_DLL_insert (cp->delayed_head,
1027 cp->delay_queue_size++;
1029 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
1030 &transmit_delayed_now,
1035 (void) GSF_peer_transmit_ (cp,
1043 if (GNUNET_BLOCK_EVALUATION_OK_LAST != eval)
1045 if (NULL == peerreq->kill_task)
1047 GNUNET_STATISTICS_update (GSF_stats,
1049 ("# P2P searches destroyed due to ultimate reply"),
1051 peerreq->kill_task =
1052 GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
1058 * Increase the peer's respect by a value.
1060 * @param cp which peer to change the respect value on
1061 * @param value is the int value by which the
1062 * peer's credit is to be increased or decreased
1063 * @returns the actual change in respect (positive or negative)
1066 change_peer_respect (struct GSF_ConnectedPeer *cp, int value)
1070 GNUNET_assert (NULL != cp);
1073 if (cp->ppd.respect + value < cp->ppd.respect)
1075 value = UINT32_MAX - cp->ppd.respect;
1076 cp->ppd.respect = UINT32_MAX;
1079 cp->ppd.respect += value;
1083 if (cp->ppd.respect < -value)
1085 value = -cp->ppd.respect;
1086 cp->ppd.respect = 0;
1089 cp->ppd.respect += value;
1096 * We've received a request with the specified priority. Bound it
1097 * according to how much we respect the given peer.
1099 * @param prio_in requested priority
1100 * @param cp the peer making the request
1101 * @return effective priority
1104 bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
1106 #define N ((double)128.0)
1111 ld = GSF_test_get_load_too_high_ (0);
1112 if (GNUNET_SYSERR == ld)
1114 #if INSANE_STATISTICS
1115 GNUNET_STATISTICS_update (GSF_stats,
1117 ("# requests done for free (low load)"), 1,
1120 return 0; /* excess resources */
1122 if (prio_in > INT32_MAX)
1123 prio_in = INT32_MAX;
1124 ret = -change_peer_respect (cp, -(int) prio_in);
1127 if (ret > GSF_current_priorities + N)
1128 rret = GSF_current_priorities + N;
1131 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1133 if ((GNUNET_YES == ld) && (ret > 0))
1135 /* try with charging */
1136 ld = GSF_test_get_load_too_high_ (ret);
1138 if (GNUNET_YES == ld)
1140 GNUNET_STATISTICS_update (GSF_stats,
1142 ("# request dropped, priority insufficient"), 1,
1145 change_peer_respect (cp, (int) ret);
1146 return -1; /* not enough resources */
1150 GNUNET_STATISTICS_update (GSF_stats,
1152 ("# requests done for a price (normal load)"), 1,
1161 * The priority level imposes a bound on the maximum
1162 * value for the ttl that can be requested.
1164 * @param ttl_in requested ttl
1165 * @param prio given priority
1166 * @return @a ttl_in if @a ttl_in is below the limit,
1167 * otherwise the ttl-limit for the given @a prio
1170 bound_ttl (int32_t ttl_in,
1173 unsigned long long allowed;
1177 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1178 if (ttl_in > allowed)
1180 if (allowed >= (1 << 30))
1189 * Closure for #test_exist_cb().
1191 struct TestExistClosure
1195 * Priority of the incoming request.
1200 * Relative TTL of the incoming request.
1205 * Type of the incoming request.
1207 enum GNUNET_BLOCK_Type type;
1210 * Set to #GNUNET_YES if we are done handling the query.
1218 * Test if the query already exists. If so, merge it, otherwise
1219 * keep `finished` at #GNUNET_NO.
1221 * @param cls our `struct TestExistClosure`
1222 * @param hc the key of the query
1223 * @param value the existing `struct PeerRequest`.
1224 * @return #GNUNET_YES to continue to iterate,
1225 * #GNUNET_NO if we successfully merged
1228 test_exist_cb (void *cls,
1229 const struct GNUNET_HashCode *hc,
1232 struct TestExistClosure *tec = cls;
1233 struct PeerRequest *peerreq = value;
1234 struct GSF_PendingRequest *pr;
1235 struct GSF_PendingRequestData *prd;
1238 prd = GSF_pending_request_get_data_ (pr);
1239 if (prd->type != tec->type)
1241 if (prd->ttl.abs_value_us >=
1242 GNUNET_TIME_absolute_get ().abs_value_us + tec->ttl * 1000LL)
1244 /* existing request has higher TTL, drop new one! */
1245 prd->priority += tec->priority;
1246 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1247 "Have existing request with higher TTL, dropping new request.\n");
1248 GNUNET_STATISTICS_update (GSF_stats,
1250 ("# requests dropped due to higher-TTL request"),
1252 tec->finished = GNUNET_YES;
1255 /* existing request has lower TTL, drop old one! */
1256 tec->priority += prd->priority;
1257 GSF_pending_request_cancel_ (pr, GNUNET_YES);
1258 free_pending_request (peerreq,
1265 * Handle P2P "QUERY" message. Creates the pending request entry
1266 * and sets up all of the data structures to that we will
1267 * process replies properly. Does not initiate forwarding or
1268 * local database lookups.
1270 * @param other the other peer involved (sender or receiver, NULL
1271 * for loopback messages where we are both sender and receiver)
1272 * @param message the actual message
1273 * @return pending request handle, NULL on error
1275 struct GSF_PendingRequest *
1276 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1277 const struct GNUNET_MessageHeader *message)
1279 struct PeerRequest *peerreq;
1280 struct GSF_PendingRequest *pr;
1281 struct GSF_ConnectedPeer *cp;
1282 struct GSF_ConnectedPeer *cps;
1283 const struct GNUNET_PeerIdentity *target;
1284 enum GSF_PendingRequestOptions options;
1286 const struct GetMessage *gm;
1288 const struct GNUNET_PeerIdentity *opt;
1291 uint32_t ttl_decrement;
1292 struct TestExistClosure tec;
1293 GNUNET_PEER_Id spid;
1294 const struct GSF_PendingRequestData *prd;
1296 msize = ntohs (message->size);
1297 if (msize < sizeof (struct GetMessage))
1299 GNUNET_break_op (0);
1302 GNUNET_STATISTICS_update (GSF_stats,
1304 ("# GET requests received (from other peers)"),
1307 gm = (const struct GetMessage *) message;
1308 tec.type = ntohl (gm->type);
1309 bm = ntohl (gm->hash_bitmap);
1317 if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_PeerIdentity))
1319 GNUNET_break_op (0);
1322 opt = (const struct GNUNET_PeerIdentity *) &gm[1];
1323 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_PeerIdentity);
1324 /* bfsize must be power of 2, check! */
1325 if (0 != ((bfsize - 1) & bfsize))
1327 GNUNET_break_op (0);
1330 GSF_cover_query_count++;
1331 bm = ntohl (gm->hash_bitmap);
1333 cps = GSF_peer_get_ (other);
1336 /* peer must have just disconnected */
1337 GNUNET_STATISTICS_update (GSF_stats,
1339 ("# requests dropped due to initiator not being connected"),
1343 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1344 cp = GSF_peer_get_ (&opt[bits++]);
1349 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1350 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1351 "Failed to find RETURN-TO peer `%s' in connection set. Dropping query.\n",
1352 GNUNET_i2s (&opt[bits - 1]));
1355 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1356 "Failed to find peer `%s' in connection set. Dropping query.\n",
1357 GNUNET_i2s (other));
1358 GNUNET_STATISTICS_update (GSF_stats,
1360 ("# requests dropped due to missing reverse route"),
1365 if (cp->ppd.pending_replies + cp->delay_queue_size > MAX_QUEUE_PER_PEER)
1367 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1368 "Peer `%s' has too many replies queued already. Dropping query.\n",
1369 GNUNET_i2s (other));
1370 GNUNET_STATISTICS_update (GSF_stats,
1371 gettext_noop ("# requests dropped due to full reply queue"),
1376 /* note that we can really only check load here since otherwise
1377 * peers could find out that we are overloaded by not being
1378 * disconnected after sending us a malformed query... */
1379 tec.priority = bound_priority (ntohl (gm->priority),
1381 if (tec.priority < 0)
1383 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1384 "Dropping query from `%s', this peer is too busy.\n",
1385 GNUNET_i2s (other));
1388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1389 "Received request for `%s' of type %u from peer `%s' with flags %u\n",
1390 GNUNET_h2s (&gm->query),
1391 (unsigned int) tec.type,
1396 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? (&opt[bits++]) : NULL;
1397 options = GSF_PRO_DEFAULTS;
1399 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + tec.priority))
1400 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1401 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value_us * 2 +
1402 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1404 /* don't have BW to send to peer, or would likely take longer than we have for it,
1405 * so at best indirect the query */
1407 options |= GSF_PRO_FORWARD_ONLY;
1408 spid = GNUNET_PEER_intern (other);
1409 GNUNET_assert (0 != spid);
1411 tec.ttl = bound_ttl (ntohl (gm->ttl),
1413 /* decrement ttl (always) */
1415 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1417 if ((tec.ttl < 0) && (((int32_t) (tec.ttl - ttl_decrement)) > 0))
1419 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1420 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1424 GNUNET_STATISTICS_update (GSF_stats,
1426 ("# requests dropped due TTL underflow"), 1,
1428 /* integer underflow => drop (should be very rare)! */
1431 tec.ttl -= ttl_decrement;
1433 /* test if the request already exists */
1434 tec.finished = GNUNET_NO;
1435 GNUNET_CONTAINER_multihashmap_get_multiple (cp->request_map,
1439 if (GNUNET_YES == tec.finished)
1440 return NULL; /* merged into existing request, we're done */
1442 peerreq = GNUNET_new (struct PeerRequest);
1444 pr = GSF_pending_request_create_ (options,
1449 ? (const char *) &opt[bits]
1452 ntohl (gm->filter_mutator),
1454 (uint32_t) tec.priority,
1457 GNUNET_PEER_intern (other),
1458 NULL, 0, /* replies_seen */
1461 GNUNET_assert (NULL != pr);
1462 prd = GSF_pending_request_get_data_ (pr);
1464 GNUNET_break (GNUNET_OK ==
1465 GNUNET_CONTAINER_multihashmap_put (cp->request_map,
1468 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1469 GNUNET_STATISTICS_update (GSF_stats,
1471 ("# P2P query messages received and processed"),
1474 GNUNET_STATISTICS_update (GSF_stats,
1475 gettext_noop ("# P2P searches active"),
1483 * Function called if there has been a timeout trying to satisfy
1484 * a transmission request.
1486 * @param cls the `struct GSF_PeerTransmitHandle` of the request
1487 * @param tc scheduler context
1490 peer_transmit_timeout (void *cls,
1491 const struct GNUNET_SCHEDULER_TaskContext *tc)
1493 struct GSF_PeerTransmitHandle *pth = cls;
1494 struct GSF_ConnectedPeer *cp;
1496 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1497 "Timeout trying to transmit to other peer\n");
1498 pth->timeout_task = NULL;
1500 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1503 if (GNUNET_YES == pth->is_query)
1504 GNUNET_assert (0 < cp->ppd.pending_queries--);
1505 else if (GNUNET_NO == pth->is_query)
1506 GNUNET_assert (0 < cp->ppd.pending_replies--);
1507 GNUNET_LOAD_update (cp->ppd.transmission_delay,
1509 if (NULL != cp->cth)
1511 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1514 pth->gmc (pth->gmc_cls, 0, NULL);
1515 GNUNET_assert (0 == cp->cth_in_progress);
1521 * Transmit a message to the given peer as soon as possible.
1522 * If the peer disconnects before the transmission can happen,
1523 * the callback is invoked with a `NULL` @a buffer.
1525 * @param cp target peer
1526 * @param is_query is this a query (#GNUNET_YES) or content (#GNUNET_NO) or neither (#GNUNET_SYSERR)
1527 * @param priority how important is this request?
1528 * @param timeout when does this request timeout (call gmc with error)
1529 * @param size number of bytes we would like to send to the peer
1530 * @param gmc function to call to get the message
1531 * @param gmc_cls closure for @a gmc
1532 * @return handle to cancel request
1534 struct GSF_PeerTransmitHandle *
1535 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
1538 struct GNUNET_TIME_Relative timeout,
1540 GSF_GetMessageCallback gmc, void *gmc_cls)
1542 struct GSF_PeerTransmitHandle *pth;
1543 struct GSF_PeerTransmitHandle *pos;
1544 struct GSF_PeerTransmitHandle *prev;
1546 pth = GNUNET_new (struct GSF_PeerTransmitHandle);
1547 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1548 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1550 pth->gmc_cls = gmc_cls;
1552 pth->is_query = is_query;
1553 pth->priority = priority;
1555 /* insertion sort (by priority, descending) */
1558 while ((NULL != pos) && (pos->priority > priority))
1563 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head,
1567 if (GNUNET_YES == is_query)
1568 cp->ppd.pending_queries++;
1569 else if (GNUNET_NO == is_query)
1570 cp->ppd.pending_replies++;
1572 = GNUNET_SCHEDULER_add_delayed (timeout,
1573 &peer_transmit_timeout,
1575 schedule_transmission (pth);
1581 * Cancel an earlier request for transmission.
1583 * @param pth request to cancel
1586 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1588 struct GSF_ConnectedPeer *cp;
1590 if (NULL != pth->timeout_task)
1592 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1593 pth->timeout_task = NULL;
1596 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1599 if (GNUNET_YES == pth->is_query)
1600 GNUNET_assert (0 < cp->ppd.pending_queries--);
1601 else if (GNUNET_NO == pth->is_query)
1602 GNUNET_assert (0 < cp->ppd.pending_replies--);
1608 * Report on receiving a reply; update the performance record of the given peer.
1610 * @param cp responding peer (will be updated)
1611 * @param request_time time at which the original query was transmitted
1612 * @param request_priority priority of the original request
1615 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1616 struct GNUNET_TIME_Absolute request_time,
1617 uint32_t request_priority)
1619 struct GNUNET_TIME_Relative delay;
1621 delay = GNUNET_TIME_absolute_get_duration (request_time);
1622 cp->ppd.avg_reply_delay.rel_value_us =
1623 (cp->ppd.avg_reply_delay.rel_value_us * (RUNAVG_DELAY_N - 1) +
1624 delay.rel_value_us) / RUNAVG_DELAY_N;
1625 cp->ppd.avg_priority =
1626 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1627 request_priority) / RUNAVG_DELAY_N;
1632 * Report on receiving a reply in response to an initiating client.
1633 * Remember that this peer is good for this client.
1635 * @param cp responding peer (will be updated)
1636 * @param initiator_client local client on responsible for query
1639 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1640 struct GSF_LocalClient *initiator_client)
1642 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1643 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1648 * Report on receiving a reply in response to an initiating peer.
1649 * Remember that this peer is good for this initiating peer.
1651 * @param cp responding peer (will be updated)
1652 * @param initiator_peer other peer responsible for query
1655 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1656 const struct GSF_ConnectedPeer *initiator_peer)
1660 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1661 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1662 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1663 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1664 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1669 * Write peer-respect information to a file - flush the buffer entry!
1672 * @param key peer identity
1673 * @param value the `struct GSF_ConnectedPeer` to flush
1674 * @return #GNUNET_OK to continue iteration
1677 flush_respect (void *cls,
1678 const struct GNUNET_PeerIdentity *key,
1681 struct GSF_ConnectedPeer *cp = value;
1682 struct GNUNET_PeerIdentity pid;
1684 if (cp->ppd.respect == cp->disk_respect)
1685 return GNUNET_OK; /* unchanged */
1686 GNUNET_assert (0 != cp->ppd.pid);
1687 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1688 GNUNET_PEERSTORE_store (peerstore, "fs", &pid, "respect", &cp->ppd.respect,
1689 sizeof (cp->ppd.respect),
1690 GNUNET_TIME_UNIT_FOREVER_ABS,
1691 GNUNET_PEERSTORE_STOREOPTION_REPLACE, NULL, NULL);
1697 * A peer disconnected from us. Tear down the connected peer
1701 * @param peer identity of peer that connected
1704 GSF_peer_disconnect_handler_ (void *cls,
1705 const struct GNUNET_PeerIdentity *peer)
1707 struct GSF_ConnectedPeer *cp;
1708 struct GSF_PeerTransmitHandle *pth;
1709 struct GSF_DelayedHandle *dh;
1711 cp = GSF_peer_get_ (peer);
1713 return; /* must have been disconnect from core with
1714 * 'peer' == my_id, ignore */
1715 flush_respect (NULL, peer, cp);
1716 GNUNET_assert (GNUNET_YES ==
1717 GNUNET_CONTAINER_multipeermap_remove (cp_map,
1720 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
1721 GNUNET_CONTAINER_multipeermap_size (cp_map),
1723 if (NULL != cp->respect_iterate_req)
1725 GNUNET_PEERSTORE_iterate_cancel (cp->respect_iterate_req);
1726 cp->respect_iterate_req = NULL;
1728 if (NULL != cp->migration_pth)
1730 GSF_peer_transmit_cancel_ (cp->migration_pth);
1731 cp->migration_pth = NULL;
1735 GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
1738 if (NULL != cp->rc_delay_task)
1740 GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
1741 cp->rc_delay_task = NULL;
1743 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1744 &cancel_pending_request,
1746 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1747 cp->request_map = NULL;
1748 GSF_plan_notify_peer_disconnect_ (cp);
1749 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1750 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1751 memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
1752 GSF_push_stop_ (cp);
1753 if (NULL != cp->cth)
1755 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1758 GNUNET_assert (0 == cp->cth_in_progress);
1759 while (NULL != (pth = cp->pth_head))
1761 if (pth->timeout_task != NULL)
1763 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1764 pth->timeout_task = NULL;
1766 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1769 if (GNUNET_YES == pth->is_query)
1770 GNUNET_assert (0 < cp->ppd.pending_queries--);
1771 else if (GNUNET_NO == pth->is_query)
1772 GNUNET_assert (0 < cp->ppd.pending_replies--);
1773 pth->gmc (pth->gmc_cls, 0, NULL);
1776 while (NULL != (dh = cp->delayed_head))
1778 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
1781 cp->delay_queue_size--;
1782 GNUNET_SCHEDULER_cancel (dh->delay_task);
1783 GNUNET_free (dh->pm);
1786 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1787 if (NULL != cp->mig_revive_task)
1789 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1790 cp->mig_revive_task = NULL;
1792 GNUNET_break (0 == cp->ppd.pending_queries);
1793 GNUNET_break (0 == cp->ppd.pending_replies);
1799 * Closure for #call_iterator().
1801 struct IterationContext
1804 * Function to call on each entry.
1806 GSF_ConnectedPeerIterator it;
1809 * Closure for @e it.
1816 * Function that calls the callback for each peer.
1818 * @param cls the `struct IterationContext *`
1819 * @param key identity of the peer
1820 * @param value the `struct GSF_ConnectedPeer *`
1821 * @return #GNUNET_YES to continue iteration
1824 call_iterator (void *cls,
1825 const struct GNUNET_PeerIdentity *key,
1828 struct IterationContext *ic = cls;
1829 struct GSF_ConnectedPeer *cp = value;
1839 * Iterate over all connected peers.
1841 * @param it function to call for each peer
1842 * @param it_cls closure for @a it
1845 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it,
1848 struct IterationContext ic;
1852 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1859 * Obtain the identity of a connected peer.
1861 * @param cp peer to get identity of
1862 * @param id identity to set (written to)
1865 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1866 struct GNUNET_PeerIdentity *id)
1868 GNUNET_assert (0 != cp->ppd.pid);
1869 GNUNET_PEER_resolve (cp->ppd.pid, id);
1874 * Obtain the identity of a connected peer.
1876 * @param cp peer to get identity of
1877 * @return reference to peer identity, valid until peer disconnects (!)
1879 const struct GNUNET_PeerIdentity *
1880 GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp)
1882 GNUNET_assert (0 != cp->ppd.pid);
1883 return GNUNET_PEER_resolve2 (cp->ppd.pid);
1888 * Assemble a migration stop message for transmission.
1890 * @param cls the `struct GSF_ConnectedPeer` to use
1891 * @param size number of bytes we're allowed to write to @a buf
1892 * @param buf where to copy the message
1893 * @return number of bytes copied to @a buf
1896 create_migration_stop_message (void *cls,
1900 struct GSF_ConnectedPeer *cp = cls;
1901 struct MigrationStopMessage msm;
1903 cp->migration_pth = NULL;
1906 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1907 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1908 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1909 msm.reserved = htonl (0);
1911 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1912 (cp->last_migration_block));
1913 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1914 GNUNET_STATISTICS_update (GSF_stats,
1915 gettext_noop ("# migration stop messages sent"),
1917 return sizeof (struct MigrationStopMessage);
1922 * Ask a peer to stop migrating data to us until the given point
1925 * @param cp peer to ask
1926 * @param block_time until when to block
1929 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1930 struct GNUNET_TIME_Absolute block_time)
1932 if (cp->last_migration_block.abs_value_us > block_time.abs_value_us)
1934 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1935 "Migration already blocked for another %s\n",
1936 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining
1937 (cp->last_migration_block), GNUNET_YES));
1938 return; /* already blocked */
1940 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %s\n",
1941 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (block_time),
1943 cp->last_migration_block = block_time;
1944 if (NULL != cp->migration_pth)
1945 GSF_peer_transmit_cancel_ (cp->migration_pth);
1947 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1948 GNUNET_TIME_UNIT_FOREVER_REL,
1949 sizeof (struct MigrationStopMessage),
1950 &create_migration_stop_message, cp);
1955 * Notify core about a preference we have for the given peer
1956 * (to allocate more resources towards it). The change will
1957 * be communicated the next time we reserve bandwidth with
1958 * core (not instantly).
1960 * @param cp peer to reserve bandwidth from
1961 * @param pref preference change
1964 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1967 cp->inc_preference += pref;
1972 * Call this method periodically to flush respect information to disk.
1974 * @param cls closure, not used
1975 * @param tc task context, not used
1978 cron_flush_respect (void *cls,
1979 const struct GNUNET_SCHEDULER_TaskContext *tc)
1983 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1984 &flush_respect, NULL);
1987 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1989 GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
1990 GNUNET_SCHEDULER_PRIORITY_HIGH,
1991 &cron_flush_respect, NULL);
1996 * Initialize peer management subsystem.
1999 GSF_connected_peer_init_ ()
2001 cp_map = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
2002 peerstore = GNUNET_PEERSTORE_connect (GSF_cfg);
2003 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
2004 &cron_flush_respect, NULL);
2009 * Iterator to free peer entries.
2011 * @param cls closure, unused
2012 * @param key current key code
2013 * @param value value in the hash map (peer entry)
2014 * @return #GNUNET_YES (we should continue to iterate)
2017 clean_peer (void *cls,
2018 const struct GNUNET_PeerIdentity *key,
2021 GSF_peer_disconnect_handler_ (NULL, key);
2027 * Shutdown peer management subsystem.
2030 GSF_connected_peer_done_ ()
2032 cron_flush_respect (NULL, NULL);
2033 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
2035 GNUNET_CONTAINER_multipeermap_destroy (cp_map);
2037 GNUNET_PEERSTORE_disconnect (peerstore, GNUNET_YES);
2042 * Iterator to remove references to LC entry.
2044 * @param cls the `struct GSF_LocalClient *` to look for
2045 * @param key current key code
2046 * @param value value in the hash map (peer entry)
2047 * @return #GNUNET_YES (we should continue to iterate)
2050 clean_local_client (void *cls,
2051 const struct GNUNET_PeerIdentity *key,
2054 const struct GSF_LocalClient *lc = cls;
2055 struct GSF_ConnectedPeer *cp = value;
2058 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
2059 if (cp->ppd.last_client_replies[i] == lc)
2060 cp->ppd.last_client_replies[i] = NULL;
2066 * Notification that a local client disconnected. Clean up all of our
2067 * references to the given handle.
2069 * @param lc handle to the local client (henceforth invalid)
2072 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
2075 return; /* already cleaned up */
2076 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_local_client,
2081 /* end of gnunet-service-fs_cp.c */