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",
663 GNUNET_TIME_UNIT_FOREVER_REL,
670 * It may be time to re-start migrating content to this
671 * peer. Check, and if so, restart migration.
673 * @param cls the `struct GSF_ConnectedPeer`
674 * @param tc scheduler context
677 revive_migration (void *cls,
678 const struct GNUNET_SCHEDULER_TaskContext *tc)
680 struct GSF_ConnectedPeer *cp = cls;
681 struct GNUNET_TIME_Relative bt;
683 cp->mig_revive_task = NULL;
684 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
685 if (0 != bt.rel_value_us)
687 /* still time left... */
688 cp->mig_revive_task =
689 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
692 GSF_push_start_ (cp);
697 * Get a handle for a connected peer.
699 * @param peer peer's identity
700 * @return NULL if the peer is not currently connected
702 struct GSF_ConnectedPeer *
703 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
707 return GNUNET_CONTAINER_multipeermap_get (cp_map, peer);
712 * Handle P2P "MIGRATION_STOP" message.
714 * @param cls closure, always NULL
715 * @param other the other peer involved (sender or receiver, NULL
716 * for loopback messages where we are both sender and receiver)
717 * @param message the actual message
718 * @return #GNUNET_OK to keep the connection open,
719 * #GNUNET_SYSERR to close it (signal serious error)
722 GSF_handle_p2p_migration_stop_ (void *cls,
723 const struct GNUNET_PeerIdentity *other,
724 const struct GNUNET_MessageHeader *message)
726 struct GSF_ConnectedPeer *cp;
727 const struct MigrationStopMessage *msm;
728 struct GNUNET_TIME_Relative bt;
730 msm = (const struct MigrationStopMessage *) message;
731 cp = GSF_peer_get_ (other);
737 GNUNET_STATISTICS_update (GSF_stats,
738 gettext_noop ("# migration stop messages received"),
740 bt = GNUNET_TIME_relative_ntoh (msm->duration);
741 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
742 _("Migration of content to peer `%s' blocked for %s\n"),
744 GNUNET_STRINGS_relative_time_to_string (bt, GNUNET_YES));
745 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
746 if ( (NULL == cp->mig_revive_task) &&
747 (NULL == cp->respect_iterate_req) )
750 cp->mig_revive_task =
751 GNUNET_SCHEDULER_add_delayed (bt,
752 &revive_migration, cp);
759 * Copy reply and free put message.
761 * @param cls the `struct PutMessage`
762 * @param buf_size number of bytes available in @a buf
763 * @param buf where to copy the message, NULL on error (peer disconnect)
764 * @return number of bytes copied to @a buf, can be 0 (without indicating an error)
767 copy_reply (void *cls,
771 struct PutMessage *pm = cls;
776 GNUNET_assert (buf_size >= ntohs (pm->header.size));
777 size = ntohs (pm->header.size);
778 memcpy (buf, pm, size);
779 GNUNET_STATISTICS_update (GSF_stats,
780 gettext_noop ("# replies transmitted to other peers"),
787 GNUNET_STATISTICS_update (GSF_stats,
788 gettext_noop ("# replies dropped"),
798 * Free resources associated with the given peer request.
800 * @param peerreq request to free
801 * @param query associated key for the request
804 free_pending_request (struct PeerRequest *peerreq,
805 const struct GNUNET_HashCode *query)
807 struct GSF_ConnectedPeer *cp = peerreq->cp;
809 if (NULL != peerreq->kill_task)
811 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
812 peerreq->kill_task = NULL;
814 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
816 GNUNET_break (GNUNET_YES ==
817 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
819 GNUNET_free (peerreq);
824 * Cancel all requests associated with the peer.
827 * @param query hash code of the request
828 * @param value the `struct GSF_PendingRequest`
829 * @return #GNUNET_YES (continue to iterate)
832 cancel_pending_request (void *cls,
833 const struct GNUNET_HashCode *query,
836 struct PeerRequest *peerreq = value;
837 struct GSF_PendingRequest *pr = peerreq->pr;
838 struct GSF_PendingRequestData *prd;
840 prd = GSF_pending_request_get_data_ (pr);
841 GSF_pending_request_cancel_ (pr, GNUNET_NO);
842 free_pending_request (peerreq, &prd->query);
848 * Free the given request.
850 * @param cls the request to free
851 * @param tc task context
854 peer_request_destroy (void *cls,
855 const struct GNUNET_SCHEDULER_TaskContext *tc)
857 struct PeerRequest *peerreq = cls;
858 struct GSF_PendingRequest *pr = peerreq->pr;
859 struct GSF_PendingRequestData *prd;
861 peerreq->kill_task = NULL;
862 prd = GSF_pending_request_get_data_ (pr);
863 cancel_pending_request (NULL, &prd->query, peerreq);
868 * The artificial delay is over, transmit the message now.
870 * @param cls the `struct GSF_DelayedHandle` with the message
871 * @param tc scheduler context
874 transmit_delayed_now (void *cls,
875 const struct GNUNET_SCHEDULER_TaskContext *tc)
877 struct GSF_DelayedHandle *dh = cls;
878 struct GSF_ConnectedPeer *cp = dh->cp;
880 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
883 cp->delay_queue_size--;
884 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
886 GNUNET_free (dh->pm);
890 (void) GSF_peer_transmit_ (cp,
902 * Get the randomized delay a response should be subjected to.
904 * @return desired delay
906 static struct GNUNET_TIME_Relative
907 get_randomized_delay ()
909 struct GNUNET_TIME_Relative ret;
912 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
913 GNUNET_CRYPTO_random_u32
914 (GNUNET_CRYPTO_QUALITY_WEAK,
915 2 * GSF_avg_latency.rel_value_us + 1));
916 #if INSANE_STATISTICS
917 GNUNET_STATISTICS_update (GSF_stats,
919 ("# artificial delays introduced (ms)"),
920 ret.rel_value_us / 1000LL, GNUNET_NO);
927 * Handle a reply to a pending request. Also called if a request
928 * expires (then with data == NULL). The handler may be called
929 * many times (depending on the request type), but will not be
930 * called during or after a call to GSF_pending_request_cancel
931 * and will also not be called anymore after a call signalling
934 * @param cls `struct PeerRequest` this is an answer for
935 * @param eval evaluation of the result
936 * @param pr handle to the original pending request
937 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
938 * @param expiration when does @a data expire?
939 * @param last_transmission when did we last transmit a request for this block
940 * @param type type of the block
941 * @param data response data, NULL on request expiration
942 * @param data_len number of bytes in @a data
945 handle_p2p_reply (void *cls,
946 enum GNUNET_BLOCK_EvaluationResult eval,
947 struct GSF_PendingRequest *pr,
948 uint32_t reply_anonymity_level,
949 struct GNUNET_TIME_Absolute expiration,
950 struct GNUNET_TIME_Absolute last_transmission,
951 enum GNUNET_BLOCK_Type type,
955 struct PeerRequest *peerreq = cls;
956 struct GSF_ConnectedPeer *cp = peerreq->cp;
957 struct GSF_PendingRequestData *prd;
958 struct PutMessage *pm;
961 GNUNET_assert (data_len + sizeof (struct PutMessage) <
962 GNUNET_SERVER_MAX_MESSAGE_SIZE);
963 GNUNET_assert (peerreq->pr == pr);
964 prd = GSF_pending_request_get_data_ (pr);
967 free_pending_request (peerreq, &prd->query);
970 GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
971 if ((prd->type != type) && (GNUNET_BLOCK_TYPE_ANY != prd->type))
973 GNUNET_STATISTICS_update (GSF_stats,
975 ("# replies dropped due to type mismatch"),
979 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
980 "Transmitting result for query `%s' to peer\n",
981 GNUNET_h2s (&prd->query));
982 GNUNET_STATISTICS_update (GSF_stats,
983 gettext_noop ("# replies received for other peers"),
985 msize = sizeof (struct PutMessage) + data_len;
986 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
991 if ((UINT32_MAX != reply_anonymity_level) && (reply_anonymity_level > 1))
993 if (reply_anonymity_level - 1 > GSF_cover_content_count)
995 GNUNET_STATISTICS_update (GSF_stats,
997 ("# replies dropped due to insufficient cover traffic"),
1001 GSF_cover_content_count -= (reply_anonymity_level - 1);
1004 pm = GNUNET_malloc (msize);
1005 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
1006 pm->header.size = htons (msize);
1007 pm->type = htonl (type);
1008 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
1009 memcpy (&pm[1], data, data_len);
1010 if ( (UINT32_MAX != reply_anonymity_level) &&
1011 (0 != reply_anonymity_level) &&
1012 (GNUNET_YES == GSF_enable_randomized_delays) )
1014 struct GSF_DelayedHandle *dh;
1016 dh = GNUNET_new (struct GSF_DelayedHandle);
1020 GNUNET_CONTAINER_DLL_insert (cp->delayed_head,
1023 cp->delay_queue_size++;
1025 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
1026 &transmit_delayed_now,
1031 (void) GSF_peer_transmit_ (cp,
1039 if (GNUNET_BLOCK_EVALUATION_OK_LAST != eval)
1041 if (NULL == peerreq->kill_task)
1043 GNUNET_STATISTICS_update (GSF_stats,
1045 ("# P2P searches destroyed due to ultimate reply"),
1047 peerreq->kill_task =
1048 GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
1054 * Increase the peer's respect by a value.
1056 * @param cp which peer to change the respect value on
1057 * @param value is the int value by which the
1058 * peer's credit is to be increased or decreased
1059 * @returns the actual change in respect (positive or negative)
1062 change_peer_respect (struct GSF_ConnectedPeer *cp, int value)
1066 GNUNET_assert (NULL != cp);
1069 if (cp->ppd.respect + value < cp->ppd.respect)
1071 value = UINT32_MAX - cp->ppd.respect;
1072 cp->ppd.respect = UINT32_MAX;
1075 cp->ppd.respect += value;
1079 if (cp->ppd.respect < -value)
1081 value = -cp->ppd.respect;
1082 cp->ppd.respect = 0;
1085 cp->ppd.respect += value;
1092 * We've received a request with the specified priority. Bound it
1093 * according to how much we respect the given peer.
1095 * @param prio_in requested priority
1096 * @param cp the peer making the request
1097 * @return effective priority
1100 bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
1102 #define N ((double)128.0)
1107 ld = GSF_test_get_load_too_high_ (0);
1108 if (GNUNET_SYSERR == ld)
1110 #if INSANE_STATISTICS
1111 GNUNET_STATISTICS_update (GSF_stats,
1113 ("# requests done for free (low load)"), 1,
1116 return 0; /* excess resources */
1118 if (prio_in > INT32_MAX)
1119 prio_in = INT32_MAX;
1120 ret = -change_peer_respect (cp, -(int) prio_in);
1123 if (ret > GSF_current_priorities + N)
1124 rret = GSF_current_priorities + N;
1127 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1129 if ((GNUNET_YES == ld) && (ret > 0))
1131 /* try with charging */
1132 ld = GSF_test_get_load_too_high_ (ret);
1134 if (GNUNET_YES == ld)
1136 GNUNET_STATISTICS_update (GSF_stats,
1138 ("# request dropped, priority insufficient"), 1,
1141 change_peer_respect (cp, (int) ret);
1142 return -1; /* not enough resources */
1146 GNUNET_STATISTICS_update (GSF_stats,
1148 ("# requests done for a price (normal load)"), 1,
1157 * The priority level imposes a bound on the maximum
1158 * value for the ttl that can be requested.
1160 * @param ttl_in requested ttl
1161 * @param prio given priority
1162 * @return ttl_in if ttl_in is below the limit,
1163 * otherwise the ttl-limit for the given priority
1166 bound_ttl (int32_t ttl_in, uint32_t prio)
1168 unsigned long long allowed;
1172 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1173 if (ttl_in > allowed)
1175 if (allowed >= (1 << 30))
1184 * Handle P2P "QUERY" message. Creates the pending request entry
1185 * and sets up all of the data structures to that we will
1186 * process replies properly. Does not initiate forwarding or
1187 * local database lookups.
1189 * @param other the other peer involved (sender or receiver, NULL
1190 * for loopback messages where we are both sender and receiver)
1191 * @param message the actual message
1192 * @return pending request handle, NULL on error
1194 struct GSF_PendingRequest *
1195 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1196 const struct GNUNET_MessageHeader *message)
1198 struct PeerRequest *peerreq;
1199 struct GSF_PendingRequest *pr;
1200 struct GSF_PendingRequestData *prd;
1201 struct GSF_ConnectedPeer *cp;
1202 struct GSF_ConnectedPeer *cps;
1203 const struct GNUNET_PeerIdentity *target;
1204 enum GSF_PendingRequestOptions options;
1206 const struct GetMessage *gm;
1208 const struct GNUNET_PeerIdentity *opt;
1211 uint32_t ttl_decrement;
1214 enum GNUNET_BLOCK_Type type;
1215 GNUNET_PEER_Id spid;
1217 msize = ntohs (message->size);
1218 if (msize < sizeof (struct GetMessage))
1220 GNUNET_break_op (0);
1223 GNUNET_STATISTICS_update (GSF_stats,
1225 ("# GET requests received (from other peers)"),
1228 gm = (const struct GetMessage *) message;
1229 type = ntohl (gm->type);
1230 bm = ntohl (gm->hash_bitmap);
1238 if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_PeerIdentity))
1240 GNUNET_break_op (0);
1243 opt = (const struct GNUNET_PeerIdentity *) &gm[1];
1244 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_PeerIdentity);
1245 /* bfsize must be power of 2, check! */
1246 if (0 != ((bfsize - 1) & bfsize))
1248 GNUNET_break_op (0);
1251 GSF_cover_query_count++;
1252 bm = ntohl (gm->hash_bitmap);
1254 cps = GSF_peer_get_ (other);
1257 /* peer must have just disconnected */
1258 GNUNET_STATISTICS_update (GSF_stats,
1260 ("# requests dropped due to initiator not being connected"),
1264 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1265 cp = GSF_peer_get_ (&opt[bits++]);
1270 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1271 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1272 "Failed to find RETURN-TO peer `%s' in connection set. Dropping query.\n",
1273 GNUNET_i2s (&opt[bits - 1]));
1276 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1277 "Failed to find peer `%s' in connection set. Dropping query.\n",
1278 GNUNET_i2s (other));
1279 GNUNET_STATISTICS_update (GSF_stats,
1281 ("# requests dropped due to missing reverse route"),
1286 if (cp->ppd.pending_replies + cp->delay_queue_size > MAX_QUEUE_PER_PEER)
1288 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1289 "Peer `%s' has too many replies queued already. Dropping query.\n",
1290 GNUNET_i2s (other));
1291 GNUNET_STATISTICS_update (GSF_stats,
1292 gettext_noop ("# requests dropped due to full reply queue"),
1297 /* note that we can really only check load here since otherwise
1298 * peers could find out that we are overloaded by not being
1299 * disconnected after sending us a malformed query... */
1300 priority = bound_priority (ntohl (gm->priority),
1304 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1305 "Dropping query from `%s', this peer is too busy.\n",
1306 GNUNET_i2s (other));
1309 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1310 "Received request for `%s' of type %u from peer `%s' with flags %u\n",
1311 GNUNET_h2s (&gm->query),
1312 (unsigned int) type,
1317 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? (&opt[bits++]) : NULL;
1318 options = GSF_PRO_DEFAULTS;
1320 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
1321 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1322 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value_us * 2 +
1323 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1325 /* don't have BW to send to peer, or would likely take longer than we have for it,
1326 * so at best indirect the query */
1328 options |= GSF_PRO_FORWARD_ONLY;
1329 spid = GNUNET_PEER_intern (other);
1330 GNUNET_assert (0 != spid);
1332 ttl = bound_ttl (ntohl (gm->ttl), priority);
1333 /* decrement ttl (always) */
1335 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1337 if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
1339 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1340 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1341 GNUNET_i2s (other), ttl, ttl_decrement);
1342 GNUNET_STATISTICS_update (GSF_stats,
1344 ("# requests dropped due TTL underflow"), 1,
1346 /* integer underflow => drop (should be very rare)! */
1349 ttl -= ttl_decrement;
1351 /* test if the request already exists */
1352 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map,
1354 if (NULL != peerreq)
1357 prd = GSF_pending_request_get_data_ (pr);
1358 if (prd->type == type)
1360 if (prd->ttl.abs_value_us >= GNUNET_TIME_absolute_get ().abs_value_us + ttl * 1000LL)
1362 /* existing request has higher TTL, drop new one! */
1363 prd->priority += priority;
1364 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1365 "Have existing request with higher TTL, dropping new request.\n",
1366 GNUNET_i2s (other));
1367 GNUNET_STATISTICS_update (GSF_stats,
1369 ("# requests dropped due to higher-TTL request"),
1373 /* existing request has lower TTL, drop old one! */
1374 priority += prd->priority;
1375 GSF_pending_request_cancel_ (pr, GNUNET_YES);
1376 free_pending_request (peerreq, &gm->query);
1380 peerreq = GNUNET_new (struct PeerRequest);
1382 pr = GSF_pending_request_create_ (options,
1387 ? (const char *) &opt[bits]
1390 ntohl (gm->filter_mutator),
1392 (uint32_t) priority,
1395 GNUNET_PEER_intern (other),
1396 NULL, 0, /* replies_seen */
1397 &handle_p2p_reply, peerreq);
1398 GNUNET_assert (NULL != pr);
1400 GNUNET_break (GNUNET_OK ==
1401 GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
1403 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1404 GNUNET_STATISTICS_update (GSF_stats,
1406 ("# P2P query messages received and processed"), 1,
1408 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
1415 * Function called if there has been a timeout trying to satisfy
1416 * a transmission request.
1418 * @param cls the `struct GSF_PeerTransmitHandle` of the request
1419 * @param tc scheduler context
1422 peer_transmit_timeout (void *cls,
1423 const struct GNUNET_SCHEDULER_TaskContext *tc)
1425 struct GSF_PeerTransmitHandle *pth = cls;
1426 struct GSF_ConnectedPeer *cp;
1428 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1429 "Timeout trying to transmit to other peer\n");
1430 pth->timeout_task = NULL;
1432 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1435 if (GNUNET_YES == pth->is_query)
1436 GNUNET_assert (0 < cp->ppd.pending_queries--);
1437 else if (GNUNET_NO == pth->is_query)
1438 GNUNET_assert (0 < cp->ppd.pending_replies--);
1439 GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
1440 if (NULL != cp->cth)
1442 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1445 pth->gmc (pth->gmc_cls, 0, NULL);
1446 GNUNET_assert (0 == cp->cth_in_progress);
1452 * Transmit a message to the given peer as soon as possible.
1453 * If the peer disconnects before the transmission can happen,
1454 * the callback is invoked with a `NULL` @a buffer.
1456 * @param cp target peer
1457 * @param is_query is this a query (#GNUNET_YES) or content (#GNUNET_NO) or neither (#GNUNET_SYSERR)
1458 * @param priority how important is this request?
1459 * @param timeout when does this request timeout (call gmc with error)
1460 * @param size number of bytes we would like to send to the peer
1461 * @param gmc function to call to get the message
1462 * @param gmc_cls closure for @a gmc
1463 * @return handle to cancel request
1465 struct GSF_PeerTransmitHandle *
1466 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
1469 struct GNUNET_TIME_Relative timeout,
1471 GSF_GetMessageCallback gmc, void *gmc_cls)
1473 struct GSF_PeerTransmitHandle *pth;
1474 struct GSF_PeerTransmitHandle *pos;
1475 struct GSF_PeerTransmitHandle *prev;
1477 pth = GNUNET_new (struct GSF_PeerTransmitHandle);
1478 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1479 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1481 pth->gmc_cls = gmc_cls;
1483 pth->is_query = is_query;
1484 pth->priority = priority;
1486 /* insertion sort (by priority, descending) */
1489 while ((NULL != pos) && (pos->priority > priority))
1494 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head,
1498 if (GNUNET_YES == is_query)
1499 cp->ppd.pending_queries++;
1500 else if (GNUNET_NO == is_query)
1501 cp->ppd.pending_replies++;
1503 = GNUNET_SCHEDULER_add_delayed (timeout,
1504 &peer_transmit_timeout,
1506 schedule_transmission (pth);
1512 * Cancel an earlier request for transmission.
1514 * @param pth request to cancel
1517 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1519 struct GSF_ConnectedPeer *cp;
1521 if (NULL != pth->timeout_task)
1523 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1524 pth->timeout_task = NULL;
1527 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1530 if (GNUNET_YES == pth->is_query)
1531 GNUNET_assert (0 < cp->ppd.pending_queries--);
1532 else if (GNUNET_NO == pth->is_query)
1533 GNUNET_assert (0 < cp->ppd.pending_replies--);
1539 * Report on receiving a reply; update the performance record of the given peer.
1541 * @param cp responding peer (will be updated)
1542 * @param request_time time at which the original query was transmitted
1543 * @param request_priority priority of the original request
1546 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1547 struct GNUNET_TIME_Absolute request_time,
1548 uint32_t request_priority)
1550 struct GNUNET_TIME_Relative delay;
1552 delay = GNUNET_TIME_absolute_get_duration (request_time);
1553 cp->ppd.avg_reply_delay.rel_value_us =
1554 (cp->ppd.avg_reply_delay.rel_value_us * (RUNAVG_DELAY_N - 1) +
1555 delay.rel_value_us) / RUNAVG_DELAY_N;
1556 cp->ppd.avg_priority =
1557 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1558 request_priority) / RUNAVG_DELAY_N;
1563 * Report on receiving a reply in response to an initiating client.
1564 * Remember that this peer is good for this client.
1566 * @param cp responding peer (will be updated)
1567 * @param initiator_client local client on responsible for query
1570 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1571 struct GSF_LocalClient *initiator_client)
1573 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1574 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1579 * Report on receiving a reply in response to an initiating peer.
1580 * Remember that this peer is good for this initiating peer.
1582 * @param cp responding peer (will be updated)
1583 * @param initiator_peer other peer responsible for query
1586 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1587 const struct GSF_ConnectedPeer *initiator_peer)
1591 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1592 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1593 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1594 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1595 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1600 * Write peer-respect information to a file - flush the buffer entry!
1603 * @param key peer identity
1604 * @param value the `struct GSF_ConnectedPeer` to flush
1605 * @return #GNUNET_OK to continue iteration
1608 flush_respect (void *cls,
1609 const struct GNUNET_PeerIdentity *key,
1612 struct GSF_ConnectedPeer *cp = value;
1613 struct GNUNET_PeerIdentity pid;
1615 if (cp->ppd.respect == cp->disk_respect)
1616 return GNUNET_OK; /* unchanged */
1617 GNUNET_assert (0 != cp->ppd.pid);
1618 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1619 GNUNET_PEERSTORE_store (peerstore, "fs", &pid, "respect", &cp->ppd.respect,
1620 sizeof (cp->ppd.respect),
1621 GNUNET_TIME_UNIT_FOREVER_ABS,
1622 GNUNET_PEERSTORE_STOREOPTION_REPLACE, NULL, NULL);
1628 * A peer disconnected from us. Tear down the connected peer
1632 * @param peer identity of peer that connected
1635 GSF_peer_disconnect_handler_ (void *cls,
1636 const struct GNUNET_PeerIdentity *peer)
1638 struct GSF_ConnectedPeer *cp;
1639 struct GSF_PeerTransmitHandle *pth;
1640 struct GSF_DelayedHandle *dh;
1642 cp = GSF_peer_get_ (peer);
1644 return; /* must have been disconnect from core with
1645 * 'peer' == my_id, ignore */
1646 flush_respect (NULL, peer, cp);
1647 GNUNET_assert (GNUNET_YES ==
1648 GNUNET_CONTAINER_multipeermap_remove (cp_map,
1651 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
1652 GNUNET_CONTAINER_multipeermap_size (cp_map),
1654 if (NULL != cp->respect_iterate_req)
1656 GNUNET_PEERSTORE_iterate_cancel (cp->respect_iterate_req);
1657 cp->respect_iterate_req = NULL;
1659 if (NULL != cp->migration_pth)
1661 GSF_peer_transmit_cancel_ (cp->migration_pth);
1662 cp->migration_pth = NULL;
1666 GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
1669 if (NULL != cp->rc_delay_task)
1671 GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
1672 cp->rc_delay_task = NULL;
1674 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1675 &cancel_pending_request, cp);
1676 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1677 cp->request_map = NULL;
1678 GSF_plan_notify_peer_disconnect_ (cp);
1679 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1680 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1681 memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
1682 GSF_push_stop_ (cp);
1683 if (NULL != cp->cth)
1685 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1688 GNUNET_assert (0 == cp->cth_in_progress);
1689 while (NULL != (pth = cp->pth_head))
1691 if (pth->timeout_task != NULL)
1693 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1694 pth->timeout_task = NULL;
1696 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1699 if (GNUNET_YES == pth->is_query)
1700 GNUNET_assert (0 < cp->ppd.pending_queries--);
1701 else if (GNUNET_NO == pth->is_query)
1702 GNUNET_assert (0 < cp->ppd.pending_replies--);
1703 pth->gmc (pth->gmc_cls, 0, NULL);
1706 while (NULL != (dh = cp->delayed_head))
1708 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
1711 cp->delay_queue_size--;
1712 GNUNET_SCHEDULER_cancel (dh->delay_task);
1713 GNUNET_free (dh->pm);
1716 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1717 if (NULL != cp->mig_revive_task)
1719 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1720 cp->mig_revive_task = NULL;
1722 GNUNET_break (0 == cp->ppd.pending_queries);
1723 GNUNET_break (0 == cp->ppd.pending_replies);
1729 * Closure for #call_iterator().
1731 struct IterationContext
1734 * Function to call on each entry.
1736 GSF_ConnectedPeerIterator it;
1739 * Closure for @e it.
1746 * Function that calls the callback for each peer.
1748 * @param cls the `struct IterationContext *`
1749 * @param key identity of the peer
1750 * @param value the `struct GSF_ConnectedPeer *`
1751 * @return #GNUNET_YES to continue iteration
1754 call_iterator (void *cls,
1755 const struct GNUNET_PeerIdentity *key,
1758 struct IterationContext *ic = cls;
1759 struct GSF_ConnectedPeer *cp = value;
1769 * Iterate over all connected peers.
1771 * @param it function to call for each peer
1772 * @param it_cls closure for @a it
1775 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it,
1778 struct IterationContext ic;
1782 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1789 * Obtain the identity of a connected peer.
1791 * @param cp peer to get identity of
1792 * @param id identity to set (written to)
1795 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1796 struct GNUNET_PeerIdentity *id)
1798 GNUNET_assert (0 != cp->ppd.pid);
1799 GNUNET_PEER_resolve (cp->ppd.pid, id);
1804 * Obtain the identity of a connected peer.
1806 * @param cp peer to get identity of
1807 * @return reference to peer identity, valid until peer disconnects (!)
1809 const struct GNUNET_PeerIdentity *
1810 GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp)
1812 GNUNET_assert (0 != cp->ppd.pid);
1813 return GNUNET_PEER_resolve2 (cp->ppd.pid);
1818 * Assemble a migration stop message for transmission.
1820 * @param cls the `struct GSF_ConnectedPeer` to use
1821 * @param size number of bytes we're allowed to write to @a buf
1822 * @param buf where to copy the message
1823 * @return number of bytes copied to @a buf
1826 create_migration_stop_message (void *cls,
1830 struct GSF_ConnectedPeer *cp = cls;
1831 struct MigrationStopMessage msm;
1833 cp->migration_pth = NULL;
1836 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1837 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1838 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1839 msm.reserved = htonl (0);
1841 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1842 (cp->last_migration_block));
1843 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1844 GNUNET_STATISTICS_update (GSF_stats,
1845 gettext_noop ("# migration stop messages sent"),
1847 return sizeof (struct MigrationStopMessage);
1852 * Ask a peer to stop migrating data to us until the given point
1855 * @param cp peer to ask
1856 * @param block_time until when to block
1859 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1860 struct GNUNET_TIME_Absolute block_time)
1862 if (cp->last_migration_block.abs_value_us > block_time.abs_value_us)
1864 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1865 "Migration already blocked for another %s\n",
1866 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining
1867 (cp->last_migration_block), GNUNET_YES));
1868 return; /* already blocked */
1870 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %s\n",
1871 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (block_time),
1873 cp->last_migration_block = block_time;
1874 if (NULL != cp->migration_pth)
1875 GSF_peer_transmit_cancel_ (cp->migration_pth);
1877 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1878 GNUNET_TIME_UNIT_FOREVER_REL,
1879 sizeof (struct MigrationStopMessage),
1880 &create_migration_stop_message, cp);
1885 * Notify core about a preference we have for the given peer
1886 * (to allocate more resources towards it). The change will
1887 * be communicated the next time we reserve bandwidth with
1888 * core (not instantly).
1890 * @param cp peer to reserve bandwidth from
1891 * @param pref preference change
1894 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1897 cp->inc_preference += pref;
1902 * Call this method periodically to flush respect information to disk.
1904 * @param cls closure, not used
1905 * @param tc task context, not used
1908 cron_flush_respect (void *cls,
1909 const struct GNUNET_SCHEDULER_TaskContext *tc)
1913 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1914 &flush_respect, NULL);
1917 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1919 GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
1920 GNUNET_SCHEDULER_PRIORITY_HIGH,
1921 &cron_flush_respect, NULL);
1926 * Initialize peer management subsystem.
1929 GSF_connected_peer_init_ ()
1931 cp_map = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
1932 peerstore = GNUNET_PEERSTORE_connect (GSF_cfg);
1933 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1934 &cron_flush_respect, NULL);
1939 * Iterator to free peer entries.
1941 * @param cls closure, unused
1942 * @param key current key code
1943 * @param value value in the hash map (peer entry)
1944 * @return #GNUNET_YES (we should continue to iterate)
1947 clean_peer (void *cls,
1948 const struct GNUNET_PeerIdentity *key,
1951 GSF_peer_disconnect_handler_ (NULL, key);
1957 * Shutdown peer management subsystem.
1960 GSF_connected_peer_done_ ()
1962 cron_flush_respect (NULL, NULL);
1963 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1965 GNUNET_CONTAINER_multipeermap_destroy (cp_map);
1967 GNUNET_PEERSTORE_disconnect (peerstore, GNUNET_YES);
1972 * Iterator to remove references to LC entry.
1974 * @param cls the `struct GSF_LocalClient *` to look for
1975 * @param key current key code
1976 * @param value value in the hash map (peer entry)
1977 * @return #GNUNET_YES (we should continue to iterate)
1980 clean_local_client (void *cls,
1981 const struct GNUNET_PeerIdentity *key,
1984 const struct GSF_LocalClient *lc = cls;
1985 struct GSF_ConnectedPeer *cp = value;
1988 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
1989 if (cp->ppd.last_client_replies[i] == lc)
1990 cp->ppd.last_client_replies[i] = NULL;
1996 * Notification that a local client disconnected. Clean up all of our
1997 * references to the given handle.
1999 * @param lc handle to the local client (henceforth invalid)
2002 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
2005 return; /* already cleaned up */
2006 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_local_client,
2011 /* end of gnunet-service-fs_cp.c */