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, GNUNET_NO);
650 GNUNET_break (GNUNET_OK ==
651 GNUNET_CONTAINER_multipeermap_put (cp_map,
652 GSF_connected_peer_get_identity2_ (cp),
654 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
655 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
656 GNUNET_CONTAINER_multipeermap_size (cp_map),
658 cp->creation_cb = creation_cb;
659 cp->creation_cb_cls = creation_cb_cls;
660 cp->respect_iterate_req =
661 GNUNET_PEERSTORE_iterate (peerstore, "fs", peer, "respect",
662 GNUNET_TIME_UNIT_FOREVER_REL, &peer_respect_cb,
668 * It may be time to re-start migrating content to this
669 * peer. Check, and if so, restart migration.
671 * @param cls the `struct GSF_ConnectedPeer`
672 * @param tc scheduler context
675 revive_migration (void *cls,
676 const struct GNUNET_SCHEDULER_TaskContext *tc)
678 struct GSF_ConnectedPeer *cp = cls;
679 struct GNUNET_TIME_Relative bt;
681 cp->mig_revive_task = NULL;
682 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
683 if (0 != bt.rel_value_us)
685 /* still time left... */
686 cp->mig_revive_task =
687 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
690 GSF_push_start_ (cp);
695 * Get a handle for a connected peer.
697 * @param peer peer's identity
698 * @return NULL if the peer is not currently connected
700 struct GSF_ConnectedPeer *
701 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
705 return GNUNET_CONTAINER_multipeermap_get (cp_map, peer);
710 * Handle P2P "MIGRATION_STOP" message.
712 * @param cls closure, always NULL
713 * @param other the other peer involved (sender or receiver, NULL
714 * for loopback messages where we are both sender and receiver)
715 * @param message the actual message
716 * @return #GNUNET_OK to keep the connection open,
717 * #GNUNET_SYSERR to close it (signal serious error)
720 GSF_handle_p2p_migration_stop_ (void *cls,
721 const struct GNUNET_PeerIdentity *other,
722 const struct GNUNET_MessageHeader *message)
724 struct GSF_ConnectedPeer *cp;
725 const struct MigrationStopMessage *msm;
726 struct GNUNET_TIME_Relative bt;
728 msm = (const struct MigrationStopMessage *) message;
729 cp = GSF_peer_get_ (other);
735 GNUNET_STATISTICS_update (GSF_stats,
736 gettext_noop ("# migration stop messages received"),
738 bt = GNUNET_TIME_relative_ntoh (msm->duration);
739 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
740 _("Migration of content to peer `%s' blocked for %s\n"),
742 GNUNET_STRINGS_relative_time_to_string (bt, GNUNET_YES));
743 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
744 if ( (NULL == cp->mig_revive_task) &&
745 (NULL == cp->respect_iterate_req) )
748 cp->mig_revive_task =
749 GNUNET_SCHEDULER_add_delayed (bt,
750 &revive_migration, cp);
757 * Copy reply and free put message.
759 * @param cls the `struct PutMessage`
760 * @param buf_size number of bytes available in @a buf
761 * @param buf where to copy the message, NULL on error (peer disconnect)
762 * @return number of bytes copied to @a buf, can be 0 (without indicating an error)
765 copy_reply (void *cls,
769 struct PutMessage *pm = cls;
774 GNUNET_assert (buf_size >= ntohs (pm->header.size));
775 size = ntohs (pm->header.size);
776 memcpy (buf, pm, size);
777 GNUNET_STATISTICS_update (GSF_stats,
778 gettext_noop ("# replies transmitted to other peers"),
785 GNUNET_STATISTICS_update (GSF_stats,
786 gettext_noop ("# replies dropped"),
796 * Free resources associated with the given peer request.
798 * @param peerreq request to free
799 * @param query associated key for the request
802 free_pending_request (struct PeerRequest *peerreq,
803 const struct GNUNET_HashCode *query)
805 struct GSF_ConnectedPeer *cp = peerreq->cp;
807 if (NULL != peerreq->kill_task)
809 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
810 peerreq->kill_task = NULL;
812 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
814 GNUNET_break (GNUNET_YES ==
815 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
817 GNUNET_free (peerreq);
822 * Cancel all requests associated with the peer.
825 * @param query hash code of the request
826 * @param value the `struct GSF_PendingRequest`
827 * @return #GNUNET_YES (continue to iterate)
830 cancel_pending_request (void *cls,
831 const struct GNUNET_HashCode *query,
834 struct PeerRequest *peerreq = value;
835 struct GSF_PendingRequest *pr = peerreq->pr;
836 struct GSF_PendingRequestData *prd;
838 prd = GSF_pending_request_get_data_ (pr);
839 GSF_pending_request_cancel_ (pr, GNUNET_NO);
840 free_pending_request (peerreq, &prd->query);
846 * Free the given request.
848 * @param cls the request to free
849 * @param tc task context
852 peer_request_destroy (void *cls,
853 const struct GNUNET_SCHEDULER_TaskContext *tc)
855 struct PeerRequest *peerreq = cls;
856 struct GSF_PendingRequest *pr = peerreq->pr;
857 struct GSF_PendingRequestData *prd;
859 peerreq->kill_task = NULL;
860 prd = GSF_pending_request_get_data_ (pr);
861 cancel_pending_request (NULL, &prd->query, peerreq);
866 * The artificial delay is over, transmit the message now.
868 * @param cls the `struct GSF_DelayedHandle` with the message
869 * @param tc scheduler context
872 transmit_delayed_now (void *cls,
873 const struct GNUNET_SCHEDULER_TaskContext *tc)
875 struct GSF_DelayedHandle *dh = cls;
876 struct GSF_ConnectedPeer *cp = dh->cp;
878 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
881 cp->delay_queue_size--;
882 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
884 GNUNET_free (dh->pm);
888 (void) GSF_peer_transmit_ (cp,
900 * Get the randomized delay a response should be subjected to.
902 * @return desired delay
904 static struct GNUNET_TIME_Relative
905 get_randomized_delay ()
907 struct GNUNET_TIME_Relative ret;
910 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
911 GNUNET_CRYPTO_random_u32
912 (GNUNET_CRYPTO_QUALITY_WEAK,
913 2 * GSF_avg_latency.rel_value_us + 1));
914 #if INSANE_STATISTICS
915 GNUNET_STATISTICS_update (GSF_stats,
917 ("# artificial delays introduced (ms)"),
918 ret.rel_value_us / 1000LL, GNUNET_NO);
925 * Handle a reply to a pending request. Also called if a request
926 * expires (then with data == NULL). The handler may be called
927 * many times (depending on the request type), but will not be
928 * called during or after a call to GSF_pending_request_cancel
929 * and will also not be called anymore after a call signalling
932 * @param cls `struct PeerRequest` this is an answer for
933 * @param eval evaluation of the result
934 * @param pr handle to the original pending request
935 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
936 * @param expiration when does @a data expire?
937 * @param last_transmission when did we last transmit a request for this block
938 * @param type type of the block
939 * @param data response data, NULL on request expiration
940 * @param data_len number of bytes in @a data
943 handle_p2p_reply (void *cls,
944 enum GNUNET_BLOCK_EvaluationResult eval,
945 struct GSF_PendingRequest *pr,
946 uint32_t reply_anonymity_level,
947 struct GNUNET_TIME_Absolute expiration,
948 struct GNUNET_TIME_Absolute last_transmission,
949 enum GNUNET_BLOCK_Type type,
953 struct PeerRequest *peerreq = cls;
954 struct GSF_ConnectedPeer *cp = peerreq->cp;
955 struct GSF_PendingRequestData *prd;
956 struct PutMessage *pm;
959 GNUNET_assert (data_len + sizeof (struct PutMessage) <
960 GNUNET_SERVER_MAX_MESSAGE_SIZE);
961 GNUNET_assert (peerreq->pr == pr);
962 prd = GSF_pending_request_get_data_ (pr);
965 free_pending_request (peerreq, &prd->query);
968 GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
969 if ((prd->type != type) && (GNUNET_BLOCK_TYPE_ANY != prd->type))
971 GNUNET_STATISTICS_update (GSF_stats,
973 ("# replies dropped due to type mismatch"),
977 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
978 "Transmitting result for query `%s' to peer\n",
979 GNUNET_h2s (&prd->query));
980 GNUNET_STATISTICS_update (GSF_stats,
981 gettext_noop ("# replies received for other peers"),
983 msize = sizeof (struct PutMessage) + data_len;
984 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
989 if ((UINT32_MAX != reply_anonymity_level) && (reply_anonymity_level > 1))
991 if (reply_anonymity_level - 1 > GSF_cover_content_count)
993 GNUNET_STATISTICS_update (GSF_stats,
995 ("# replies dropped due to insufficient cover traffic"),
999 GSF_cover_content_count -= (reply_anonymity_level - 1);
1002 pm = GNUNET_malloc (msize);
1003 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
1004 pm->header.size = htons (msize);
1005 pm->type = htonl (type);
1006 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
1007 memcpy (&pm[1], data, data_len);
1008 if ( (UINT32_MAX != reply_anonymity_level) &&
1009 (0 != reply_anonymity_level) &&
1010 (GNUNET_YES == GSF_enable_randomized_delays) )
1012 struct GSF_DelayedHandle *dh;
1014 dh = GNUNET_new (struct GSF_DelayedHandle);
1018 GNUNET_CONTAINER_DLL_insert (cp->delayed_head,
1021 cp->delay_queue_size++;
1023 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
1024 &transmit_delayed_now,
1029 (void) GSF_peer_transmit_ (cp,
1037 if (GNUNET_BLOCK_EVALUATION_OK_LAST != eval)
1039 if (NULL == peerreq->kill_task)
1041 GNUNET_STATISTICS_update (GSF_stats,
1043 ("# P2P searches destroyed due to ultimate reply"),
1045 peerreq->kill_task =
1046 GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
1052 * Increase the peer's respect by a value.
1054 * @param cp which peer to change the respect value on
1055 * @param value is the int value by which the
1056 * peer's credit is to be increased or decreased
1057 * @returns the actual change in respect (positive or negative)
1060 change_peer_respect (struct GSF_ConnectedPeer *cp, int value)
1064 GNUNET_assert (NULL != cp);
1067 if (cp->ppd.respect + value < cp->ppd.respect)
1069 value = UINT32_MAX - cp->ppd.respect;
1070 cp->ppd.respect = UINT32_MAX;
1073 cp->ppd.respect += value;
1077 if (cp->ppd.respect < -value)
1079 value = -cp->ppd.respect;
1080 cp->ppd.respect = 0;
1083 cp->ppd.respect += value;
1090 * We've received a request with the specified priority. Bound it
1091 * according to how much we respect the given peer.
1093 * @param prio_in requested priority
1094 * @param cp the peer making the request
1095 * @return effective priority
1098 bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
1100 #define N ((double)128.0)
1105 ld = GSF_test_get_load_too_high_ (0);
1106 if (GNUNET_SYSERR == ld)
1108 #if INSANE_STATISTICS
1109 GNUNET_STATISTICS_update (GSF_stats,
1111 ("# requests done for free (low load)"), 1,
1114 return 0; /* excess resources */
1116 if (prio_in > INT32_MAX)
1117 prio_in = INT32_MAX;
1118 ret = -change_peer_respect (cp, -(int) prio_in);
1121 if (ret > GSF_current_priorities + N)
1122 rret = GSF_current_priorities + N;
1125 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1127 if ((GNUNET_YES == ld) && (ret > 0))
1129 /* try with charging */
1130 ld = GSF_test_get_load_too_high_ (ret);
1132 if (GNUNET_YES == ld)
1134 GNUNET_STATISTICS_update (GSF_stats,
1136 ("# request dropped, priority insufficient"), 1,
1139 change_peer_respect (cp, (int) ret);
1140 return -1; /* not enough resources */
1144 GNUNET_STATISTICS_update (GSF_stats,
1146 ("# requests done for a price (normal load)"), 1,
1155 * The priority level imposes a bound on the maximum
1156 * value for the ttl that can be requested.
1158 * @param ttl_in requested ttl
1159 * @param prio given priority
1160 * @return ttl_in if ttl_in is below the limit,
1161 * otherwise the ttl-limit for the given priority
1164 bound_ttl (int32_t ttl_in, uint32_t prio)
1166 unsigned long long allowed;
1170 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1171 if (ttl_in > allowed)
1173 if (allowed >= (1 << 30))
1182 * Handle P2P "QUERY" message. Creates the pending request entry
1183 * and sets up all of the data structures to that we will
1184 * process replies properly. Does not initiate forwarding or
1185 * local database lookups.
1187 * @param other the other peer involved (sender or receiver, NULL
1188 * for loopback messages where we are both sender and receiver)
1189 * @param message the actual message
1190 * @return pending request handle, NULL on error
1192 struct GSF_PendingRequest *
1193 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1194 const struct GNUNET_MessageHeader *message)
1196 struct PeerRequest *peerreq;
1197 struct GSF_PendingRequest *pr;
1198 struct GSF_PendingRequestData *prd;
1199 struct GSF_ConnectedPeer *cp;
1200 struct GSF_ConnectedPeer *cps;
1201 const struct GNUNET_PeerIdentity *target;
1202 enum GSF_PendingRequestOptions options;
1204 const struct GetMessage *gm;
1206 const struct GNUNET_PeerIdentity *opt;
1209 uint32_t ttl_decrement;
1212 enum GNUNET_BLOCK_Type type;
1213 GNUNET_PEER_Id spid;
1215 msize = ntohs (message->size);
1216 if (msize < sizeof (struct GetMessage))
1218 GNUNET_break_op (0);
1221 GNUNET_STATISTICS_update (GSF_stats,
1223 ("# GET requests received (from other peers)"),
1226 gm = (const struct GetMessage *) message;
1227 type = ntohl (gm->type);
1228 bm = ntohl (gm->hash_bitmap);
1236 if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_PeerIdentity))
1238 GNUNET_break_op (0);
1241 opt = (const struct GNUNET_PeerIdentity *) &gm[1];
1242 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_PeerIdentity);
1243 /* bfsize must be power of 2, check! */
1244 if (0 != ((bfsize - 1) & bfsize))
1246 GNUNET_break_op (0);
1249 GSF_cover_query_count++;
1250 bm = ntohl (gm->hash_bitmap);
1252 cps = GSF_peer_get_ (other);
1255 /* peer must have just disconnected */
1256 GNUNET_STATISTICS_update (GSF_stats,
1258 ("# requests dropped due to initiator not being connected"),
1262 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1263 cp = GSF_peer_get_ (&opt[bits++]);
1268 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1269 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1270 "Failed to find RETURN-TO peer `%s' in connection set. Dropping query.\n",
1271 GNUNET_i2s (&opt[bits - 1]));
1274 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1275 "Failed to find peer `%s' in connection set. Dropping query.\n",
1276 GNUNET_i2s (other));
1277 GNUNET_STATISTICS_update (GSF_stats,
1279 ("# requests dropped due to missing reverse route"),
1284 if (cp->ppd.pending_replies + cp->delay_queue_size > MAX_QUEUE_PER_PEER)
1286 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1287 "Peer `%s' has too many replies queued already. Dropping query.\n",
1288 GNUNET_i2s (other));
1289 GNUNET_STATISTICS_update (GSF_stats,
1290 gettext_noop ("# requests dropped due to full reply queue"),
1295 /* note that we can really only check load here since otherwise
1296 * peers could find out that we are overloaded by not being
1297 * disconnected after sending us a malformed query... */
1298 priority = bound_priority (ntohl (gm->priority),
1302 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1303 "Dropping query from `%s', this peer is too busy.\n",
1304 GNUNET_i2s (other));
1307 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1308 "Received request for `%s' of type %u from peer `%s' with flags %u\n",
1309 GNUNET_h2s (&gm->query),
1310 (unsigned int) type,
1315 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? (&opt[bits++]) : NULL;
1316 options = GSF_PRO_DEFAULTS;
1318 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
1319 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1320 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value_us * 2 +
1321 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1323 /* don't have BW to send to peer, or would likely take longer than we have for it,
1324 * so at best indirect the query */
1326 options |= GSF_PRO_FORWARD_ONLY;
1327 spid = GNUNET_PEER_intern (other);
1328 GNUNET_assert (0 != spid);
1330 ttl = bound_ttl (ntohl (gm->ttl), priority);
1331 /* decrement ttl (always) */
1333 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1335 if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
1337 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1338 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1339 GNUNET_i2s (other), ttl, ttl_decrement);
1340 GNUNET_STATISTICS_update (GSF_stats,
1342 ("# requests dropped due TTL underflow"), 1,
1344 /* integer underflow => drop (should be very rare)! */
1347 ttl -= ttl_decrement;
1349 /* test if the request already exists */
1350 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map,
1352 if (NULL != peerreq)
1355 prd = GSF_pending_request_get_data_ (pr);
1356 if (prd->type == type)
1358 if (prd->ttl.abs_value_us >= GNUNET_TIME_absolute_get ().abs_value_us + ttl * 1000LL)
1360 /* existing request has higher TTL, drop new one! */
1361 prd->priority += priority;
1362 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1363 "Have existing request with higher TTL, dropping new request.\n",
1364 GNUNET_i2s (other));
1365 GNUNET_STATISTICS_update (GSF_stats,
1367 ("# requests dropped due to higher-TTL request"),
1371 /* existing request has lower TTL, drop old one! */
1372 priority += prd->priority;
1373 GSF_pending_request_cancel_ (pr, GNUNET_YES);
1374 free_pending_request (peerreq, &gm->query);
1378 peerreq = GNUNET_new (struct PeerRequest);
1380 pr = GSF_pending_request_create_ (options,
1385 ? (const char *) &opt[bits]
1388 ntohl (gm->filter_mutator),
1390 (uint32_t) priority,
1393 GNUNET_PEER_intern (other),
1394 NULL, 0, /* replies_seen */
1395 &handle_p2p_reply, peerreq);
1396 GNUNET_assert (NULL != pr);
1398 GNUNET_break (GNUNET_OK ==
1399 GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
1401 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1402 GNUNET_STATISTICS_update (GSF_stats,
1404 ("# P2P query messages received and processed"), 1,
1406 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
1413 * Function called if there has been a timeout trying to satisfy
1414 * a transmission request.
1416 * @param cls the `struct GSF_PeerTransmitHandle` of the request
1417 * @param tc scheduler context
1420 peer_transmit_timeout (void *cls,
1421 const struct GNUNET_SCHEDULER_TaskContext *tc)
1423 struct GSF_PeerTransmitHandle *pth = cls;
1424 struct GSF_ConnectedPeer *cp;
1426 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1427 "Timeout trying to transmit to other peer\n");
1428 pth->timeout_task = NULL;
1430 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1433 if (GNUNET_YES == pth->is_query)
1434 GNUNET_assert (0 < cp->ppd.pending_queries--);
1435 else if (GNUNET_NO == pth->is_query)
1436 GNUNET_assert (0 < cp->ppd.pending_replies--);
1437 GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
1438 if (NULL != cp->cth)
1440 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1443 pth->gmc (pth->gmc_cls, 0, NULL);
1444 GNUNET_assert (0 == cp->cth_in_progress);
1450 * Transmit a message to the given peer as soon as possible.
1451 * If the peer disconnects before the transmission can happen,
1452 * the callback is invoked with a `NULL` @a buffer.
1454 * @param cp target peer
1455 * @param is_query is this a query (#GNUNET_YES) or content (#GNUNET_NO) or neither (#GNUNET_SYSERR)
1456 * @param priority how important is this request?
1457 * @param timeout when does this request timeout (call gmc with error)
1458 * @param size number of bytes we would like to send to the peer
1459 * @param gmc function to call to get the message
1460 * @param gmc_cls closure for @a gmc
1461 * @return handle to cancel request
1463 struct GSF_PeerTransmitHandle *
1464 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
1467 struct GNUNET_TIME_Relative timeout,
1469 GSF_GetMessageCallback gmc, void *gmc_cls)
1471 struct GSF_PeerTransmitHandle *pth;
1472 struct GSF_PeerTransmitHandle *pos;
1473 struct GSF_PeerTransmitHandle *prev;
1475 pth = GNUNET_new (struct GSF_PeerTransmitHandle);
1476 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1477 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1479 pth->gmc_cls = gmc_cls;
1481 pth->is_query = is_query;
1482 pth->priority = priority;
1484 /* insertion sort (by priority, descending) */
1487 while ((NULL != pos) && (pos->priority > priority))
1492 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head,
1496 if (GNUNET_YES == is_query)
1497 cp->ppd.pending_queries++;
1498 else if (GNUNET_NO == is_query)
1499 cp->ppd.pending_replies++;
1501 = GNUNET_SCHEDULER_add_delayed (timeout,
1502 &peer_transmit_timeout,
1504 schedule_transmission (pth);
1510 * Cancel an earlier request for transmission.
1512 * @param pth request to cancel
1515 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1517 struct GSF_ConnectedPeer *cp;
1519 if (NULL != pth->timeout_task)
1521 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1522 pth->timeout_task = NULL;
1525 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1528 if (GNUNET_YES == pth->is_query)
1529 GNUNET_assert (0 < cp->ppd.pending_queries--);
1530 else if (GNUNET_NO == pth->is_query)
1531 GNUNET_assert (0 < cp->ppd.pending_replies--);
1537 * Report on receiving a reply; update the performance record of the given peer.
1539 * @param cp responding peer (will be updated)
1540 * @param request_time time at which the original query was transmitted
1541 * @param request_priority priority of the original request
1544 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1545 struct GNUNET_TIME_Absolute request_time,
1546 uint32_t request_priority)
1548 struct GNUNET_TIME_Relative delay;
1550 delay = GNUNET_TIME_absolute_get_duration (request_time);
1551 cp->ppd.avg_reply_delay.rel_value_us =
1552 (cp->ppd.avg_reply_delay.rel_value_us * (RUNAVG_DELAY_N - 1) +
1553 delay.rel_value_us) / RUNAVG_DELAY_N;
1554 cp->ppd.avg_priority =
1555 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1556 request_priority) / RUNAVG_DELAY_N;
1561 * Report on receiving a reply in response to an initiating client.
1562 * Remember that this peer is good for this client.
1564 * @param cp responding peer (will be updated)
1565 * @param initiator_client local client on responsible for query
1568 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1569 struct GSF_LocalClient *initiator_client)
1571 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1572 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1577 * Report on receiving a reply in response to an initiating peer.
1578 * Remember that this peer is good for this initiating peer.
1580 * @param cp responding peer (will be updated)
1581 * @param initiator_peer other peer responsible for query
1584 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1585 const struct GSF_ConnectedPeer *initiator_peer)
1589 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1590 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1591 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1592 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1593 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1598 * Write peer-respect information to a file - flush the buffer entry!
1601 * @param key peer identity
1602 * @param value the `struct GSF_ConnectedPeer` to flush
1603 * @return #GNUNET_OK to continue iteration
1606 flush_respect (void *cls,
1607 const struct GNUNET_PeerIdentity *key,
1610 struct GSF_ConnectedPeer *cp = value;
1611 struct GNUNET_PeerIdentity pid;
1613 if (cp->ppd.respect == cp->disk_respect)
1614 return GNUNET_OK; /* unchanged */
1615 GNUNET_assert (0 != cp->ppd.pid);
1616 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1617 GNUNET_PEERSTORE_store (peerstore, "fs", &pid, "respect", &cp->ppd.respect,
1618 sizeof (cp->ppd.respect),
1619 GNUNET_TIME_UNIT_FOREVER_ABS,
1620 GNUNET_PEERSTORE_STOREOPTION_REPLACE, NULL, NULL);
1626 * A peer disconnected from us. Tear down the connected peer
1630 * @param peer identity of peer that connected
1633 GSF_peer_disconnect_handler_ (void *cls,
1634 const struct GNUNET_PeerIdentity *peer)
1636 struct GSF_ConnectedPeer *cp;
1637 struct GSF_PeerTransmitHandle *pth;
1638 struct GSF_DelayedHandle *dh;
1640 cp = GSF_peer_get_ (peer);
1642 return; /* must have been disconnect from core with
1643 * 'peer' == my_id, ignore */
1644 flush_respect (NULL, peer, cp);
1645 GNUNET_assert (GNUNET_YES ==
1646 GNUNET_CONTAINER_multipeermap_remove (cp_map,
1649 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
1650 GNUNET_CONTAINER_multipeermap_size (cp_map),
1652 if (NULL != cp->respect_iterate_req)
1654 GNUNET_PEERSTORE_iterate_cancel (cp->respect_iterate_req);
1655 cp->respect_iterate_req = NULL;
1657 if (NULL != cp->migration_pth)
1659 GSF_peer_transmit_cancel_ (cp->migration_pth);
1660 cp->migration_pth = NULL;
1664 GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
1667 if (NULL != cp->rc_delay_task)
1669 GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
1670 cp->rc_delay_task = NULL;
1672 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1673 &cancel_pending_request, cp);
1674 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1675 cp->request_map = NULL;
1676 GSF_plan_notify_peer_disconnect_ (cp);
1677 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1678 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1679 memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
1680 GSF_push_stop_ (cp);
1681 if (NULL != cp->cth)
1683 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1686 GNUNET_assert (0 == cp->cth_in_progress);
1687 while (NULL != (pth = cp->pth_head))
1689 if (pth->timeout_task != NULL)
1691 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1692 pth->timeout_task = NULL;
1694 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1697 if (GNUNET_YES == pth->is_query)
1698 GNUNET_assert (0 < cp->ppd.pending_queries--);
1699 else if (GNUNET_NO == pth->is_query)
1700 GNUNET_assert (0 < cp->ppd.pending_replies--);
1701 pth->gmc (pth->gmc_cls, 0, NULL);
1704 while (NULL != (dh = cp->delayed_head))
1706 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
1709 cp->delay_queue_size--;
1710 GNUNET_SCHEDULER_cancel (dh->delay_task);
1711 GNUNET_free (dh->pm);
1714 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1715 if (NULL != cp->mig_revive_task)
1717 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1718 cp->mig_revive_task = NULL;
1720 GNUNET_break (0 == cp->ppd.pending_queries);
1721 GNUNET_break (0 == cp->ppd.pending_replies);
1727 * Closure for #call_iterator().
1729 struct IterationContext
1732 * Function to call on each entry.
1734 GSF_ConnectedPeerIterator it;
1737 * Closure for @e it.
1744 * Function that calls the callback for each peer.
1746 * @param cls the `struct IterationContext *`
1747 * @param key identity of the peer
1748 * @param value the `struct GSF_ConnectedPeer *`
1749 * @return #GNUNET_YES to continue iteration
1752 call_iterator (void *cls,
1753 const struct GNUNET_PeerIdentity *key,
1756 struct IterationContext *ic = cls;
1757 struct GSF_ConnectedPeer *cp = value;
1767 * Iterate over all connected peers.
1769 * @param it function to call for each peer
1770 * @param it_cls closure for @a it
1773 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it,
1776 struct IterationContext ic;
1780 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1787 * Obtain the identity of a connected peer.
1789 * @param cp peer to get identity of
1790 * @param id identity to set (written to)
1793 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1794 struct GNUNET_PeerIdentity *id)
1796 GNUNET_assert (0 != cp->ppd.pid);
1797 GNUNET_PEER_resolve (cp->ppd.pid, id);
1802 * Obtain the identity of a connected peer.
1804 * @param cp peer to get identity of
1805 * @return reference to peer identity, valid until peer disconnects (!)
1807 const struct GNUNET_PeerIdentity *
1808 GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp)
1810 GNUNET_assert (0 != cp->ppd.pid);
1811 return GNUNET_PEER_resolve2 (cp->ppd.pid);
1816 * Assemble a migration stop message for transmission.
1818 * @param cls the `struct GSF_ConnectedPeer` to use
1819 * @param size number of bytes we're allowed to write to @a buf
1820 * @param buf where to copy the message
1821 * @return number of bytes copied to @a buf
1824 create_migration_stop_message (void *cls,
1828 struct GSF_ConnectedPeer *cp = cls;
1829 struct MigrationStopMessage msm;
1831 cp->migration_pth = NULL;
1834 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1835 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1836 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1837 msm.reserved = htonl (0);
1839 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1840 (cp->last_migration_block));
1841 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1842 GNUNET_STATISTICS_update (GSF_stats,
1843 gettext_noop ("# migration stop messages sent"),
1845 return sizeof (struct MigrationStopMessage);
1850 * Ask a peer to stop migrating data to us until the given point
1853 * @param cp peer to ask
1854 * @param block_time until when to block
1857 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1858 struct GNUNET_TIME_Absolute block_time)
1860 if (cp->last_migration_block.abs_value_us > block_time.abs_value_us)
1862 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1863 "Migration already blocked for another %s\n",
1864 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining
1865 (cp->last_migration_block), GNUNET_YES));
1866 return; /* already blocked */
1868 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %s\n",
1869 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (block_time),
1871 cp->last_migration_block = block_time;
1872 if (NULL != cp->migration_pth)
1873 GSF_peer_transmit_cancel_ (cp->migration_pth);
1875 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1876 GNUNET_TIME_UNIT_FOREVER_REL,
1877 sizeof (struct MigrationStopMessage),
1878 &create_migration_stop_message, cp);
1883 * Notify core about a preference we have for the given peer
1884 * (to allocate more resources towards it). The change will
1885 * be communicated the next time we reserve bandwidth with
1886 * core (not instantly).
1888 * @param cp peer to reserve bandwidth from
1889 * @param pref preference change
1892 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1895 cp->inc_preference += pref;
1900 * Call this method periodically to flush respect information to disk.
1902 * @param cls closure, not used
1903 * @param tc task context, not used
1906 cron_flush_respect (void *cls,
1907 const struct GNUNET_SCHEDULER_TaskContext *tc)
1911 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1912 &flush_respect, NULL);
1915 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1917 GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
1918 GNUNET_SCHEDULER_PRIORITY_HIGH,
1919 &cron_flush_respect, NULL);
1924 * Initialize peer management subsystem.
1927 GSF_connected_peer_init_ ()
1929 cp_map = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
1930 peerstore = GNUNET_PEERSTORE_connect (GSF_cfg);
1931 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1932 &cron_flush_respect, NULL);
1937 * Iterator to free peer entries.
1939 * @param cls closure, unused
1940 * @param key current key code
1941 * @param value value in the hash map (peer entry)
1942 * @return #GNUNET_YES (we should continue to iterate)
1945 clean_peer (void *cls,
1946 const struct GNUNET_PeerIdentity *key,
1949 GSF_peer_disconnect_handler_ (NULL, key);
1955 * Shutdown peer management subsystem.
1958 GSF_connected_peer_done_ ()
1960 cron_flush_respect (NULL, NULL);
1961 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1963 GNUNET_CONTAINER_multipeermap_destroy (cp_map);
1965 GNUNET_PEERSTORE_disconnect (peerstore, GNUNET_YES);
1970 * Iterator to remove references to LC entry.
1972 * @param cls the `struct GSF_LocalClient *` to look for
1973 * @param key current key code
1974 * @param value value in the hash map (peer entry)
1975 * @return #GNUNET_YES (we should continue to iterate)
1978 clean_local_client (void *cls,
1979 const struct GNUNET_PeerIdentity *key,
1982 const struct GSF_LocalClient *lc = cls;
1983 struct GSF_ConnectedPeer *cp = value;
1986 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
1987 if (cp->ppd.last_client_replies[i] == lc)
1988 cp->ppd.last_client_replies[i] = NULL;
1994 * Notification that a local client disconnected. Clean up all of our
1995 * references to the given handle.
1997 * @param lc handle to the local client (henceforth invalid)
2000 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
2003 return; /* already cleaned up */
2004 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_local_client,
2009 /* end of gnunet-service-fs_cp.c */