2 This file is part of GNUnet.
3 Copyright (C) 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
21 * @file fs/gnunet-service-fs_cp.c
22 * @brief API to handle 'connected peers'
23 * @author Christian Grothoff
26 #include "gnunet_util_lib.h"
27 #include "gnunet_load_lib.h"
28 #include "gnunet-service-fs.h"
29 #include "gnunet-service-fs_cp.h"
30 #include "gnunet-service-fs_pe.h"
31 #include "gnunet-service-fs_pr.h"
32 #include "gnunet-service-fs_push.h"
33 #include "gnunet_peerstore_service.h"
37 * Ratio for moving average delay calculation. The previous
38 * average goes in with a factor of (n-1) into the calculation.
41 #define RUNAVG_DELAY_N 16
44 * How often do we flush respect values to disk?
46 #define RESPECT_FLUSH_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
49 * After how long do we discard a reply?
51 #define REPLY_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
54 * Collect an instane number of statistics? May cause excessive IPC.
56 #define INSANE_STATISTICS GNUNET_NO
60 * Handle to cancel a transmission request.
62 struct GSF_PeerTransmitHandle
66 * Kept in a doubly-linked list.
68 struct GSF_PeerTransmitHandle *next;
71 * Kept in a doubly-linked list.
73 struct GSF_PeerTransmitHandle *prev;
76 * Time when this transmission request was issued.
78 struct GNUNET_TIME_Absolute transmission_request_start_time;
81 * Timeout for this request.
83 struct GNUNET_TIME_Absolute timeout;
86 * Task called on timeout, or 0 for none.
88 struct GNUNET_SCHEDULER_Task *timeout_task;
91 * Function to call to get the actual message.
93 GSF_GetMessageCallback gmc;
96 * Peer this request targets.
98 struct GSF_ConnectedPeer *cp;
101 * Closure for @e gmc.
106 * Size of the message to be transmitted.
111 * #GNUNET_YES if this is a query, #GNUNET_NO for content.
116 * Did we get a reservation already?
121 * Priority of this request.
129 * Handle for an entry in our delay list.
131 struct GSF_DelayedHandle
135 * Kept in a doubly-linked list.
137 struct GSF_DelayedHandle *next;
140 * Kept in a doubly-linked list.
142 struct GSF_DelayedHandle *prev;
145 * Peer this transmission belongs to.
147 struct GSF_ConnectedPeer *cp;
150 * The PUT that was delayed.
152 struct PutMessage *pm;
155 * Task for the delay.
157 struct GNUNET_SCHEDULER_Task *delay_task;
160 * Size of the message.
168 * Information per peer and request.
174 * Handle to generic request.
176 struct GSF_PendingRequest *pr;
179 * Handle to specific peer.
181 struct GSF_ConnectedPeer *cp;
184 * Task for asynchronous stopping of this request.
186 struct GNUNET_SCHEDULER_Task *kill_task;
194 struct GSF_ConnectedPeer
198 * Performance data for this peer.
200 struct GSF_PeerPerformanceData ppd;
203 * Time until when we blocked this peer from migrating
206 struct GNUNET_TIME_Absolute last_migration_block;
209 * Task scheduled to revive migration to this peer.
211 struct GNUNET_SCHEDULER_Task *mig_revive_task;
214 * Messages (replies, queries, content migration) we would like to
215 * send to this peer in the near future. Sorted by priority, head.
217 struct GSF_PeerTransmitHandle *pth_head;
220 * Messages (replies, queries, content migration) we would like to
221 * send to this peer in the near future. Sorted by priority, tail.
223 struct GSF_PeerTransmitHandle *pth_tail;
226 * Messages (replies, queries, content migration) we would like to
227 * send to this peer in the near future. Sorted by priority, head.
229 struct GSF_DelayedHandle *delayed_head;
232 * Messages (replies, queries, content migration) we would like to
233 * send to this peer in the near future. Sorted by priority, tail.
235 struct GSF_DelayedHandle *delayed_tail;
238 * Migration stop message in our queue, or NULL if we have none pending.
240 struct GSF_PeerTransmitHandle *migration_pth;
243 * Context of our GNUNET_ATS_reserve_bandwidth call (or NULL).
245 struct GNUNET_ATS_ReservationContext *rc;
248 * Task scheduled if we need to retry bandwidth reservation later.
250 struct GNUNET_SCHEDULER_Task *rc_delay_task;
253 * Active requests from this neighbour, map of query to 'struct PeerRequest'.
255 struct GNUNET_CONTAINER_MultiHashMap *request_map;
258 * Handle for an active request for transmission to this
259 * peer, or NULL (if core queue was full).
261 struct GNUNET_CORE_TransmitHandle *cth;
264 * Increase in traffic preference still to be submitted
265 * to the core service for this peer.
267 uint64_t inc_preference;
270 * Set to 1 if we're currently in the process of calling
271 * #GNUNET_CORE_notify_transmit_ready() (so while @e cth is
272 * NULL, we should not call notify_transmit_ready for this
275 unsigned int cth_in_progress;
278 * Number of entries in @e delayed_head DLL.
280 unsigned int delay_queue_size;
283 * Respect rating for this peer on disk.
285 uint32_t disk_respect;
288 * Which offset in @e last_p2p_replies will be updated next?
289 * (we go round-robin).
291 unsigned int last_p2p_replies_woff;
294 * Which offset in @e last_client_replies will be updated next?
295 * (we go round-robin).
297 unsigned int last_client_replies_woff;
300 * Current offset into @e last_request_times ring buffer.
302 unsigned int last_request_times_off;
305 * #GNUNET_YES if we did successfully reserve 32k bandwidth,
311 * Function called when the creation of this record is complete.
313 GSF_ConnectedPeerCreationCallback creation_cb;
316 * Closure for @e creation_cb
318 void *creation_cb_cls;
321 * Handle to the PEERSTORE iterate request for peer respect value
323 struct GNUNET_PEERSTORE_IterateContext *respect_iterate_req;
329 * Map from peer identities to `struct GSF_ConnectPeer` entries.
331 static struct GNUNET_CONTAINER_MultiPeerMap *cp_map;
334 * Handle to peerstore service.
336 static struct GNUNET_PEERSTORE_Handle *peerstore;
340 * Update the latency information kept for the given peer.
342 * @param id peer record to update
343 * @param latency current latency value
346 GSF_update_peer_latency_ (const struct GNUNET_PeerIdentity *id,
347 struct GNUNET_TIME_Relative latency)
349 struct GSF_ConnectedPeer *cp;
351 cp = GSF_peer_get_ (id);
353 return; /* we're not yet connected at the core level, ignore */
354 GNUNET_LOAD_value_set_decline (cp->ppd.transmission_delay,
360 * Return the performance data record for the given peer
362 * @param cp peer to query
363 * @return performance data record for the peer
365 struct GSF_PeerPerformanceData *
366 GSF_get_peer_performance_data_ (struct GSF_ConnectedPeer *cp)
373 * Core is ready to transmit to a peer, get the message.
375 * @param cls the `struct GSF_PeerTransmitHandle` of the message
376 * @param size number of bytes core is willing to take
377 * @param buf where to copy the message
378 * @return number of bytes copied to @a buf
381 peer_transmit_ready_cb (void *cls,
387 * Function called by core upon success or failure of our bandwidth reservation request.
389 * @param cls the `struct GSF_ConnectedPeer` of the peer for which we made the request
390 * @param peer identifies the peer
391 * @param amount set to the amount that was actually reserved or unreserved;
392 * either the full requested amount or zero (no partial reservations)
393 * @param res_delay if the reservation could not be satisfied (amount was 0), how
394 * long should the client wait until re-trying?
397 ats_reserve_callback (void *cls,
398 const struct GNUNET_PeerIdentity *peer,
400 struct GNUNET_TIME_Relative res_delay);
404 * If ready (bandwidth reserved), try to schedule transmission via
405 * core for the given handle.
407 * @param pth transmission handle to schedule
410 schedule_transmission (struct GSF_PeerTransmitHandle *pth)
412 struct GSF_ConnectedPeer *cp;
413 struct GNUNET_PeerIdentity target;
416 if ((NULL != cp->cth) || (0 != cp->cth_in_progress))
417 return; /* already done */
418 GNUNET_assert (0 != cp->ppd.pid);
419 GNUNET_PEER_resolve (cp->ppd.pid, &target);
421 if (0 != cp->inc_preference)
423 GNUNET_ATS_performance_change_preference (GSF_ats,
425 GNUNET_ATS_PREFERENCE_BANDWIDTH,
426 (double) cp->inc_preference,
427 GNUNET_ATS_PREFERENCE_END);
428 cp->inc_preference = 0;
431 if ( (GNUNET_YES == pth->is_query) &&
432 (GNUNET_YES != pth->was_reserved) )
434 /* query, need reservation */
435 if (GNUNET_YES != cp->did_reserve)
436 return; /* not ready */
437 cp->did_reserve = GNUNET_NO;
438 /* reservation already done! */
439 pth->was_reserved = GNUNET_YES;
440 cp->rc = GNUNET_ATS_reserve_bandwidth (GSF_ats,
443 &ats_reserve_callback,
447 GNUNET_assert (NULL == cp->cth);
448 cp->cth_in_progress++;
450 GNUNET_CORE_notify_transmit_ready (GSF_core,
452 GNUNET_CORE_PRIO_BACKGROUND,
453 GNUNET_TIME_absolute_get_remaining (pth->timeout),
456 &peer_transmit_ready_cb, cp);
457 GNUNET_assert (NULL != cp->cth);
458 GNUNET_assert (0 < cp->cth_in_progress--);
463 * Core is ready to transmit to a peer, get the message.
465 * @param cls the `struct GSF_PeerTransmitHandle` of the message
466 * @param size number of bytes core is willing to take
467 * @param buf where to copy the message
468 * @return number of bytes copied to @a buf
471 peer_transmit_ready_cb (void *cls,
475 struct GSF_ConnectedPeer *cp = cls;
476 struct GSF_PeerTransmitHandle *pth = cp->pth_head;
477 struct GSF_PeerTransmitHandle *pos;
483 if (pth->size > size)
485 schedule_transmission (pth);
488 if (NULL != pth->timeout_task)
490 GNUNET_SCHEDULER_cancel (pth->timeout_task);
491 pth->timeout_task = NULL;
493 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
496 if (GNUNET_YES == pth->is_query)
498 cp->ppd.last_request_times[(cp->last_request_times_off++) %
499 MAX_QUEUE_PER_PEER] =
500 GNUNET_TIME_absolute_get ();
501 GNUNET_assert (0 < cp->ppd.pending_queries--);
503 else if (GNUNET_NO == pth->is_query)
505 GNUNET_assert (0 < cp->ppd.pending_replies--);
507 GNUNET_LOAD_update (cp->ppd.transmission_delay,
508 GNUNET_TIME_absolute_get_duration
509 (pth->transmission_request_start_time).rel_value_us);
510 ret = pth->gmc (pth->gmc_cls, size, buf);
511 if (NULL != (pos = cp->pth_head))
513 GNUNET_assert (pos != pth);
514 schedule_transmission (pos);
522 * (re)try to reserve bandwidth from the given peer.
524 * @param cls the `struct GSF_ConnectedPeer` to reserve from
525 * @param tc scheduler context
528 retry_reservation (void *cls,
529 const struct GNUNET_SCHEDULER_TaskContext *tc)
531 struct GSF_ConnectedPeer *cp = cls;
532 struct GNUNET_PeerIdentity target;
534 GNUNET_PEER_resolve (cp->ppd.pid, &target);
535 cp->rc_delay_task = NULL;
537 GNUNET_ATS_reserve_bandwidth (GSF_ats,
540 &ats_reserve_callback, cp);
545 * Function called by core upon success or failure of our bandwidth reservation request.
547 * @param cls the `struct GSF_ConnectedPeer` of the peer for which we made the request
548 * @param peer identifies the peer
549 * @param amount set to the amount that was actually reserved or unreserved;
550 * either the full requested amount or zero (no partial reservations)
551 * @param res_delay if the reservation could not be satisfied (amount was 0), how
552 * long should the client wait until re-trying?
555 ats_reserve_callback (void *cls,
556 const struct GNUNET_PeerIdentity *peer,
558 struct GNUNET_TIME_Relative res_delay)
560 struct GSF_ConnectedPeer *cp = cls;
561 struct GSF_PeerTransmitHandle *pth;
563 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
564 "Reserved %d bytes / need to wait %s for reservation\n",
566 GNUNET_STRINGS_relative_time_to_string (res_delay, GNUNET_YES));
571 GNUNET_SCHEDULER_add_delayed (res_delay,
576 cp->did_reserve = GNUNET_YES;
578 if ( (NULL != pth) &&
580 (0 == cp->cth_in_progress) )
582 /* reservation success, try transmission now! */
583 cp->cth_in_progress++;
585 GNUNET_CORE_notify_transmit_ready (GSF_core,
587 GNUNET_CORE_PRIO_BACKGROUND,
588 GNUNET_TIME_absolute_get_remaining (pth->timeout),
591 &peer_transmit_ready_cb,
593 GNUNET_assert (NULL != cp->cth);
594 GNUNET_assert (0 < cp->cth_in_progress--);
600 * Function called by PEERSTORE with peer respect record
602 * @param cls handle to connected peer entry
603 * @param record peerstore record information
604 * @param emsg error message, or NULL if no errors
605 * @return #GNUNET_NO to stop iterating since we only expect 0 or 1 records
608 peer_respect_cb (void *cls,
609 const struct GNUNET_PEERSTORE_Record *record,
612 struct GSF_ConnectedPeer *cp = cls;
614 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)
747 cp->mig_revive_task =
748 GNUNET_SCHEDULER_add_delayed (bt,
749 &revive_migration, cp);
756 * Copy reply and free put message.
758 * @param cls the `struct PutMessage`
759 * @param buf_size number of bytes available in @a buf
760 * @param buf where to copy the message, NULL on error (peer disconnect)
761 * @return number of bytes copied to @a buf, can be 0 (without indicating an error)
764 copy_reply (void *cls,
768 struct PutMessage *pm = cls;
773 GNUNET_assert (buf_size >= ntohs (pm->header.size));
774 size = ntohs (pm->header.size);
775 memcpy (buf, pm, size);
776 GNUNET_STATISTICS_update (GSF_stats,
777 gettext_noop ("# replies transmitted to other peers"),
784 GNUNET_STATISTICS_update (GSF_stats,
785 gettext_noop ("# replies dropped"),
795 * Free resources associated with the given peer request.
797 * @param peerreq request to free
798 * @param query associated key for the request
801 free_pending_request (struct PeerRequest *peerreq,
802 const struct GNUNET_HashCode *query)
804 struct GSF_ConnectedPeer *cp = peerreq->cp;
806 if (NULL != peerreq->kill_task)
808 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
809 peerreq->kill_task = NULL;
811 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
813 GNUNET_break (GNUNET_YES ==
814 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
816 GNUNET_free (peerreq);
821 * Cancel all requests associated with the peer.
824 * @param query hash code of the request
825 * @param value the `struct GSF_PendingRequest`
826 * @return #GNUNET_YES (continue to iterate)
829 cancel_pending_request (void *cls,
830 const struct GNUNET_HashCode *query,
833 struct PeerRequest *peerreq = value;
834 struct GSF_PendingRequest *pr = peerreq->pr;
835 struct GSF_PendingRequestData *prd;
837 prd = GSF_pending_request_get_data_ (pr);
838 GSF_pending_request_cancel_ (pr, GNUNET_NO);
839 free_pending_request (peerreq, &prd->query);
845 * Free the given request.
847 * @param cls the request to free
848 * @param tc task context
851 peer_request_destroy (void *cls,
852 const struct GNUNET_SCHEDULER_TaskContext *tc)
854 struct PeerRequest *peerreq = cls;
855 struct GSF_PendingRequest *pr = peerreq->pr;
856 struct GSF_PendingRequestData *prd;
858 peerreq->kill_task = NULL;
859 prd = GSF_pending_request_get_data_ (pr);
860 cancel_pending_request (NULL, &prd->query, peerreq);
865 * The artificial delay is over, transmit the message now.
867 * @param cls the `struct GSF_DelayedHandle` with the message
868 * @param tc scheduler context
871 transmit_delayed_now (void *cls,
872 const struct GNUNET_SCHEDULER_TaskContext *tc)
874 struct GSF_DelayedHandle *dh = cls;
875 struct GSF_ConnectedPeer *cp = dh->cp;
877 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
880 cp->delay_queue_size--;
881 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
883 GNUNET_free (dh->pm);
887 (void) GSF_peer_transmit_ (cp,
899 * Get the randomized delay a response should be subjected to.
901 * @return desired delay
903 static struct GNUNET_TIME_Relative
904 get_randomized_delay ()
906 struct GNUNET_TIME_Relative ret;
909 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
910 GNUNET_CRYPTO_random_u32
911 (GNUNET_CRYPTO_QUALITY_WEAK,
912 2 * GSF_avg_latency.rel_value_us + 1));
913 #if INSANE_STATISTICS
914 GNUNET_STATISTICS_update (GSF_stats,
916 ("# artificial delays introduced (ms)"),
917 ret.rel_value_us / 1000LL, GNUNET_NO);
924 * Handle a reply to a pending request. Also called if a request
925 * expires (then with data == NULL). The handler may be called
926 * many times (depending on the request type), but will not be
927 * called during or after a call to GSF_pending_request_cancel
928 * and will also not be called anymore after a call signalling
931 * @param cls `struct PeerRequest` this is an answer for
932 * @param eval evaluation of the result
933 * @param pr handle to the original pending request
934 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
935 * @param expiration when does @a data expire?
936 * @param last_transmission when did we last transmit a request for this block
937 * @param type type of the block
938 * @param data response data, NULL on request expiration
939 * @param data_len number of bytes in @a data
942 handle_p2p_reply (void *cls,
943 enum GNUNET_BLOCK_EvaluationResult eval,
944 struct GSF_PendingRequest *pr,
945 uint32_t reply_anonymity_level,
946 struct GNUNET_TIME_Absolute expiration,
947 struct GNUNET_TIME_Absolute last_transmission,
948 enum GNUNET_BLOCK_Type type,
952 struct PeerRequest *peerreq = cls;
953 struct GSF_ConnectedPeer *cp = peerreq->cp;
954 struct GSF_PendingRequestData *prd;
955 struct PutMessage *pm;
958 GNUNET_assert (data_len + sizeof (struct PutMessage) <
959 GNUNET_SERVER_MAX_MESSAGE_SIZE);
960 GNUNET_assert (peerreq->pr == pr);
961 prd = GSF_pending_request_get_data_ (pr);
964 free_pending_request (peerreq, &prd->query);
967 GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
968 if ((prd->type != type) && (GNUNET_BLOCK_TYPE_ANY != prd->type))
970 GNUNET_STATISTICS_update (GSF_stats,
972 ("# replies dropped due to type mismatch"),
976 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
977 "Transmitting result for query `%s' to peer\n",
978 GNUNET_h2s (&prd->query));
979 GNUNET_STATISTICS_update (GSF_stats,
980 gettext_noop ("# replies received for other peers"),
982 msize = sizeof (struct PutMessage) + data_len;
983 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
988 if ((UINT32_MAX != reply_anonymity_level) && (reply_anonymity_level > 1))
990 if (reply_anonymity_level - 1 > GSF_cover_content_count)
992 GNUNET_STATISTICS_update (GSF_stats,
994 ("# replies dropped due to insufficient cover traffic"),
998 GSF_cover_content_count -= (reply_anonymity_level - 1);
1001 pm = GNUNET_malloc (msize);
1002 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
1003 pm->header.size = htons (msize);
1004 pm->type = htonl (type);
1005 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
1006 memcpy (&pm[1], data, data_len);
1007 if ( (UINT32_MAX != reply_anonymity_level) &&
1008 (0 != reply_anonymity_level) &&
1009 (GNUNET_YES == GSF_enable_randomized_delays) )
1011 struct GSF_DelayedHandle *dh;
1013 dh = GNUNET_new (struct GSF_DelayedHandle);
1017 GNUNET_CONTAINER_DLL_insert (cp->delayed_head,
1020 cp->delay_queue_size++;
1022 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
1023 &transmit_delayed_now,
1028 (void) GSF_peer_transmit_ (cp,
1036 if (GNUNET_BLOCK_EVALUATION_OK_LAST != eval)
1038 if (NULL == peerreq->kill_task)
1040 GNUNET_STATISTICS_update (GSF_stats,
1042 ("# P2P searches destroyed due to ultimate reply"),
1044 peerreq->kill_task =
1045 GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
1051 * Increase the peer's respect by a value.
1053 * @param cp which peer to change the respect value on
1054 * @param value is the int value by which the
1055 * peer's credit is to be increased or decreased
1056 * @returns the actual change in respect (positive or negative)
1059 change_peer_respect (struct GSF_ConnectedPeer *cp, int value)
1063 GNUNET_assert (NULL != cp);
1066 if (cp->ppd.respect + value < cp->ppd.respect)
1068 value = UINT32_MAX - cp->ppd.respect;
1069 cp->ppd.respect = UINT32_MAX;
1072 cp->ppd.respect += value;
1076 if (cp->ppd.respect < -value)
1078 value = -cp->ppd.respect;
1079 cp->ppd.respect = 0;
1082 cp->ppd.respect += value;
1089 * We've received a request with the specified priority. Bound it
1090 * according to how much we respect the given peer.
1092 * @param prio_in requested priority
1093 * @param cp the peer making the request
1094 * @return effective priority
1097 bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
1099 #define N ((double)128.0)
1104 ld = GSF_test_get_load_too_high_ (0);
1105 if (GNUNET_SYSERR == ld)
1107 #if INSANE_STATISTICS
1108 GNUNET_STATISTICS_update (GSF_stats,
1110 ("# requests done for free (low load)"), 1,
1113 return 0; /* excess resources */
1115 if (prio_in > INT32_MAX)
1116 prio_in = INT32_MAX;
1117 ret = -change_peer_respect (cp, -(int) prio_in);
1120 if (ret > GSF_current_priorities + N)
1121 rret = GSF_current_priorities + N;
1124 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1126 if ((GNUNET_YES == ld) && (ret > 0))
1128 /* try with charging */
1129 ld = GSF_test_get_load_too_high_ (ret);
1131 if (GNUNET_YES == ld)
1133 GNUNET_STATISTICS_update (GSF_stats,
1135 ("# request dropped, priority insufficient"), 1,
1138 change_peer_respect (cp, (int) ret);
1139 return -1; /* not enough resources */
1143 GNUNET_STATISTICS_update (GSF_stats,
1145 ("# requests done for a price (normal load)"), 1,
1154 * The priority level imposes a bound on the maximum
1155 * value for the ttl that can be requested.
1157 * @param ttl_in requested ttl
1158 * @param prio given priority
1159 * @return ttl_in if ttl_in is below the limit,
1160 * otherwise the ttl-limit for the given priority
1163 bound_ttl (int32_t ttl_in, uint32_t prio)
1165 unsigned long long allowed;
1169 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1170 if (ttl_in > allowed)
1172 if (allowed >= (1 << 30))
1181 * Handle P2P "QUERY" message. Creates the pending request entry
1182 * and sets up all of the data structures to that we will
1183 * process replies properly. Does not initiate forwarding or
1184 * local database lookups.
1186 * @param other the other peer involved (sender or receiver, NULL
1187 * for loopback messages where we are both sender and receiver)
1188 * @param message the actual message
1189 * @return pending request handle, NULL on error
1191 struct GSF_PendingRequest *
1192 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1193 const struct GNUNET_MessageHeader *message)
1195 struct PeerRequest *peerreq;
1196 struct GSF_PendingRequest *pr;
1197 struct GSF_PendingRequestData *prd;
1198 struct GSF_ConnectedPeer *cp;
1199 struct GSF_ConnectedPeer *cps;
1200 const struct GNUNET_PeerIdentity *target;
1201 enum GSF_PendingRequestOptions options;
1203 const struct GetMessage *gm;
1205 const struct GNUNET_PeerIdentity *opt;
1208 uint32_t ttl_decrement;
1211 enum GNUNET_BLOCK_Type type;
1212 GNUNET_PEER_Id spid;
1214 msize = ntohs (message->size);
1215 if (msize < sizeof (struct GetMessage))
1217 GNUNET_break_op (0);
1220 GNUNET_STATISTICS_update (GSF_stats,
1222 ("# GET requests received (from other peers)"),
1225 gm = (const struct GetMessage *) message;
1226 type = ntohl (gm->type);
1227 bm = ntohl (gm->hash_bitmap);
1235 if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_PeerIdentity))
1237 GNUNET_break_op (0);
1240 opt = (const struct GNUNET_PeerIdentity *) &gm[1];
1241 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_PeerIdentity);
1242 /* bfsize must be power of 2, check! */
1243 if (0 != ((bfsize - 1) & bfsize))
1245 GNUNET_break_op (0);
1248 GSF_cover_query_count++;
1249 bm = ntohl (gm->hash_bitmap);
1251 cps = GSF_peer_get_ (other);
1254 /* peer must have just disconnected */
1255 GNUNET_STATISTICS_update (GSF_stats,
1257 ("# requests dropped due to initiator not being connected"),
1261 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1262 cp = GSF_peer_get_ (&opt[bits++]);
1267 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1268 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1269 "Failed to find RETURN-TO peer `%s' in connection set. Dropping query.\n",
1270 GNUNET_i2s (&opt[bits - 1]));
1273 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1274 "Failed to find peer `%s' in connection set. Dropping query.\n",
1275 GNUNET_i2s (other));
1276 GNUNET_STATISTICS_update (GSF_stats,
1278 ("# requests dropped due to missing reverse route"),
1283 if (cp->ppd.pending_replies + cp->delay_queue_size > MAX_QUEUE_PER_PEER)
1285 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1286 "Peer `%s' has too many replies queued already. Dropping query.\n",
1287 GNUNET_i2s (other));
1288 GNUNET_STATISTICS_update (GSF_stats,
1289 gettext_noop ("# requests dropped due to full reply queue"),
1294 /* note that we can really only check load here since otherwise
1295 * peers could find out that we are overloaded by not being
1296 * disconnected after sending us a malformed query... */
1297 priority = bound_priority (ntohl (gm->priority),
1301 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1302 "Dropping query from `%s', this peer is too busy.\n",
1303 GNUNET_i2s (other));
1306 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1307 "Received request for `%s' of type %u from peer `%s' with flags %u\n",
1308 GNUNET_h2s (&gm->query),
1309 (unsigned int) type,
1314 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? (&opt[bits++]) : NULL;
1315 options = GSF_PRO_DEFAULTS;
1317 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
1318 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1319 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value_us * 2 +
1320 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1322 /* don't have BW to send to peer, or would likely take longer than we have for it,
1323 * so at best indirect the query */
1325 options |= GSF_PRO_FORWARD_ONLY;
1326 spid = GNUNET_PEER_intern (other);
1327 GNUNET_assert (0 != spid);
1329 ttl = bound_ttl (ntohl (gm->ttl), priority);
1330 /* decrement ttl (always) */
1332 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1334 if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
1336 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1337 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1338 GNUNET_i2s (other), ttl, ttl_decrement);
1339 GNUNET_STATISTICS_update (GSF_stats,
1341 ("# requests dropped due TTL underflow"), 1,
1343 /* integer underflow => drop (should be very rare)! */
1346 ttl -= ttl_decrement;
1348 /* test if the request already exists */
1349 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map,
1351 if (NULL != peerreq)
1354 prd = GSF_pending_request_get_data_ (pr);
1355 if (prd->type == type)
1357 if (prd->ttl.abs_value_us >= GNUNET_TIME_absolute_get ().abs_value_us + ttl * 1000LL)
1359 /* existing request has higher TTL, drop new one! */
1360 prd->priority += priority;
1361 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1362 "Have existing request with higher TTL, dropping new request.\n",
1363 GNUNET_i2s (other));
1364 GNUNET_STATISTICS_update (GSF_stats,
1366 ("# requests dropped due to higher-TTL request"),
1370 /* existing request has lower TTL, drop old one! */
1371 priority += prd->priority;
1372 GSF_pending_request_cancel_ (pr, GNUNET_YES);
1373 free_pending_request (peerreq, &gm->query);
1377 peerreq = GNUNET_new (struct PeerRequest);
1379 pr = GSF_pending_request_create_ (options,
1384 ? (const char *) &opt[bits]
1387 ntohl (gm->filter_mutator),
1389 (uint32_t) priority,
1392 GNUNET_PEER_intern (other),
1393 NULL, 0, /* replies_seen */
1394 &handle_p2p_reply, peerreq);
1395 GNUNET_assert (NULL != pr);
1397 GNUNET_break (GNUNET_OK ==
1398 GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
1400 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1401 GNUNET_STATISTICS_update (GSF_stats,
1403 ("# P2P query messages received and processed"), 1,
1405 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
1412 * Function called if there has been a timeout trying to satisfy
1413 * a transmission request.
1415 * @param cls the `struct GSF_PeerTransmitHandle` of the request
1416 * @param tc scheduler context
1419 peer_transmit_timeout (void *cls,
1420 const struct GNUNET_SCHEDULER_TaskContext *tc)
1422 struct GSF_PeerTransmitHandle *pth = cls;
1423 struct GSF_ConnectedPeer *cp;
1425 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1426 "Timeout trying to transmit to other peer\n");
1427 pth->timeout_task = NULL;
1429 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1432 if (GNUNET_YES == pth->is_query)
1433 GNUNET_assert (0 < cp->ppd.pending_queries--);
1434 else if (GNUNET_NO == pth->is_query)
1435 GNUNET_assert (0 < cp->ppd.pending_replies--);
1436 GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
1437 if (NULL != cp->cth)
1439 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1442 pth->gmc (pth->gmc_cls, 0, NULL);
1443 GNUNET_assert (0 == cp->cth_in_progress);
1449 * Transmit a message to the given peer as soon as possible.
1450 * If the peer disconnects before the transmission can happen,
1451 * the callback is invoked with a `NULL` @a buffer.
1453 * @param cp target peer
1454 * @param is_query is this a query (#GNUNET_YES) or content (#GNUNET_NO) or neither (#GNUNET_SYSERR)
1455 * @param priority how important is this request?
1456 * @param timeout when does this request timeout (call gmc with error)
1457 * @param size number of bytes we would like to send to the peer
1458 * @param gmc function to call to get the message
1459 * @param gmc_cls closure for @a gmc
1460 * @return handle to cancel request
1462 struct GSF_PeerTransmitHandle *
1463 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
1466 struct GNUNET_TIME_Relative timeout,
1468 GSF_GetMessageCallback gmc, void *gmc_cls)
1470 struct GSF_PeerTransmitHandle *pth;
1471 struct GSF_PeerTransmitHandle *pos;
1472 struct GSF_PeerTransmitHandle *prev;
1474 pth = GNUNET_new (struct GSF_PeerTransmitHandle);
1475 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1476 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1478 pth->gmc_cls = gmc_cls;
1480 pth->is_query = is_query;
1481 pth->priority = priority;
1483 /* insertion sort (by priority, descending) */
1486 while ((NULL != pos) && (pos->priority > priority))
1491 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head,
1495 if (GNUNET_YES == is_query)
1496 cp->ppd.pending_queries++;
1497 else if (GNUNET_NO == is_query)
1498 cp->ppd.pending_replies++;
1500 = GNUNET_SCHEDULER_add_delayed (timeout,
1501 &peer_transmit_timeout,
1503 schedule_transmission (pth);
1509 * Cancel an earlier request for transmission.
1511 * @param pth request to cancel
1514 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1516 struct GSF_ConnectedPeer *cp;
1518 if (NULL != pth->timeout_task)
1520 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1521 pth->timeout_task = NULL;
1524 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1527 if (GNUNET_YES == pth->is_query)
1528 GNUNET_assert (0 < cp->ppd.pending_queries--);
1529 else if (GNUNET_NO == pth->is_query)
1530 GNUNET_assert (0 < cp->ppd.pending_replies--);
1536 * Report on receiving a reply; update the performance record of the given peer.
1538 * @param cp responding peer (will be updated)
1539 * @param request_time time at which the original query was transmitted
1540 * @param request_priority priority of the original request
1543 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1544 struct GNUNET_TIME_Absolute request_time,
1545 uint32_t request_priority)
1547 struct GNUNET_TIME_Relative delay;
1549 delay = GNUNET_TIME_absolute_get_duration (request_time);
1550 cp->ppd.avg_reply_delay.rel_value_us =
1551 (cp->ppd.avg_reply_delay.rel_value_us * (RUNAVG_DELAY_N - 1) +
1552 delay.rel_value_us) / RUNAVG_DELAY_N;
1553 cp->ppd.avg_priority =
1554 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1555 request_priority) / RUNAVG_DELAY_N;
1560 * Report on receiving a reply in response to an initiating client.
1561 * Remember that this peer is good for this client.
1563 * @param cp responding peer (will be updated)
1564 * @param initiator_client local client on responsible for query
1567 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1568 struct GSF_LocalClient *initiator_client)
1570 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1571 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1576 * Report on receiving a reply in response to an initiating peer.
1577 * Remember that this peer is good for this initiating peer.
1579 * @param cp responding peer (will be updated)
1580 * @param initiator_peer other peer responsible for query
1583 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1584 const struct GSF_ConnectedPeer *initiator_peer)
1588 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1589 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1590 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1591 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1592 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1597 * Write peer-respect information to a file - flush the buffer entry!
1600 * @param key peer identity
1601 * @param value the `struct GSF_ConnectedPeer` to flush
1602 * @return #GNUNET_OK to continue iteration
1605 flush_respect (void *cls,
1606 const struct GNUNET_PeerIdentity *key,
1609 struct GSF_ConnectedPeer *cp = value;
1610 struct GNUNET_PeerIdentity pid;
1612 if (cp->ppd.respect == cp->disk_respect)
1613 return GNUNET_OK; /* unchanged */
1614 GNUNET_assert (0 != cp->ppd.pid);
1615 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1616 GNUNET_PEERSTORE_store (peerstore, "fs", &pid, "respect", &cp->ppd.respect,
1617 sizeof (cp->ppd.respect),
1618 GNUNET_TIME_UNIT_FOREVER_ABS,
1619 GNUNET_PEERSTORE_STOREOPTION_REPLACE, NULL, NULL);
1625 * A peer disconnected from us. Tear down the connected peer
1629 * @param peer identity of peer that connected
1632 GSF_peer_disconnect_handler_ (void *cls,
1633 const struct GNUNET_PeerIdentity *peer)
1635 struct GSF_ConnectedPeer *cp;
1636 struct GSF_PeerTransmitHandle *pth;
1637 struct GSF_DelayedHandle *dh;
1639 cp = GSF_peer_get_ (peer);
1641 return; /* must have been disconnect from core with
1642 * 'peer' == my_id, ignore */
1643 flush_respect (NULL, peer, cp);
1644 GNUNET_assert (GNUNET_YES ==
1645 GNUNET_CONTAINER_multipeermap_remove (cp_map,
1648 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
1649 GNUNET_CONTAINER_multipeermap_size (cp_map),
1651 if (NULL != cp->respect_iterate_req)
1653 GNUNET_PEERSTORE_iterate_cancel (cp->respect_iterate_req);
1654 cp->respect_iterate_req = NULL;
1656 if (NULL != cp->migration_pth)
1658 GSF_peer_transmit_cancel_ (cp->migration_pth);
1659 cp->migration_pth = NULL;
1663 GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
1666 if (NULL != cp->rc_delay_task)
1668 GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
1669 cp->rc_delay_task = NULL;
1671 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1672 &cancel_pending_request, cp);
1673 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1674 cp->request_map = NULL;
1675 GSF_plan_notify_peer_disconnect_ (cp);
1676 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1677 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1678 memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
1679 GSF_push_stop_ (cp);
1680 if (NULL != cp->cth)
1682 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1685 GNUNET_assert (0 == cp->cth_in_progress);
1686 while (NULL != (pth = cp->pth_head))
1688 if (pth->timeout_task != NULL)
1690 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1691 pth->timeout_task = NULL;
1693 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1696 if (GNUNET_YES == pth->is_query)
1697 GNUNET_assert (0 < cp->ppd.pending_queries--);
1698 else if (GNUNET_NO == pth->is_query)
1699 GNUNET_assert (0 < cp->ppd.pending_replies--);
1700 pth->gmc (pth->gmc_cls, 0, NULL);
1703 while (NULL != (dh = cp->delayed_head))
1705 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
1708 cp->delay_queue_size--;
1709 GNUNET_SCHEDULER_cancel (dh->delay_task);
1710 GNUNET_free (dh->pm);
1713 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1714 if (NULL != cp->mig_revive_task)
1716 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1717 cp->mig_revive_task = NULL;
1719 GNUNET_break (0 == cp->ppd.pending_queries);
1720 GNUNET_break (0 == cp->ppd.pending_replies);
1726 * Closure for #call_iterator().
1728 struct IterationContext
1731 * Function to call on each entry.
1733 GSF_ConnectedPeerIterator it;
1736 * Closure for @e it.
1743 * Function that calls the callback for each peer.
1745 * @param cls the `struct IterationContext *`
1746 * @param key identity of the peer
1747 * @param value the `struct GSF_ConnectedPeer *`
1748 * @return #GNUNET_YES to continue iteration
1751 call_iterator (void *cls,
1752 const struct GNUNET_PeerIdentity *key,
1755 struct IterationContext *ic = cls;
1756 struct GSF_ConnectedPeer *cp = value;
1766 * Iterate over all connected peers.
1768 * @param it function to call for each peer
1769 * @param it_cls closure for @a it
1772 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it,
1775 struct IterationContext ic;
1779 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1786 * Obtain the identity of a connected peer.
1788 * @param cp peer to get identity of
1789 * @param id identity to set (written to)
1792 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1793 struct GNUNET_PeerIdentity *id)
1795 GNUNET_assert (0 != cp->ppd.pid);
1796 GNUNET_PEER_resolve (cp->ppd.pid, id);
1801 * Obtain the identity of a connected peer.
1803 * @param cp peer to get identity of
1804 * @return reference to peer identity, valid until peer disconnects (!)
1806 const struct GNUNET_PeerIdentity *
1807 GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp)
1809 GNUNET_assert (0 != cp->ppd.pid);
1810 return GNUNET_PEER_resolve2 (cp->ppd.pid);
1815 * Assemble a migration stop message for transmission.
1817 * @param cls the `struct GSF_ConnectedPeer` to use
1818 * @param size number of bytes we're allowed to write to @a buf
1819 * @param buf where to copy the message
1820 * @return number of bytes copied to @a buf
1823 create_migration_stop_message (void *cls,
1827 struct GSF_ConnectedPeer *cp = cls;
1828 struct MigrationStopMessage msm;
1830 cp->migration_pth = NULL;
1833 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1834 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1835 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1836 msm.reserved = htonl (0);
1838 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1839 (cp->last_migration_block));
1840 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1841 GNUNET_STATISTICS_update (GSF_stats,
1842 gettext_noop ("# migration stop messages sent"),
1844 return sizeof (struct MigrationStopMessage);
1849 * Ask a peer to stop migrating data to us until the given point
1852 * @param cp peer to ask
1853 * @param block_time until when to block
1856 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1857 struct GNUNET_TIME_Absolute block_time)
1859 if (cp->last_migration_block.abs_value_us > block_time.abs_value_us)
1861 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1862 "Migration already blocked for another %s\n",
1863 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining
1864 (cp->last_migration_block), GNUNET_YES));
1865 return; /* already blocked */
1867 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %s\n",
1868 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (block_time),
1870 cp->last_migration_block = block_time;
1871 if (NULL != cp->migration_pth)
1872 GSF_peer_transmit_cancel_ (cp->migration_pth);
1874 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1875 GNUNET_TIME_UNIT_FOREVER_REL,
1876 sizeof (struct MigrationStopMessage),
1877 &create_migration_stop_message, cp);
1882 * Notify core about a preference we have for the given peer
1883 * (to allocate more resources towards it). The change will
1884 * be communicated the next time we reserve bandwidth with
1885 * core (not instantly).
1887 * @param cp peer to reserve bandwidth from
1888 * @param pref preference change
1891 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1894 cp->inc_preference += pref;
1899 * Call this method periodically to flush respect information to disk.
1901 * @param cls closure, not used
1902 * @param tc task context, not used
1905 cron_flush_respect (void *cls,
1906 const struct GNUNET_SCHEDULER_TaskContext *tc)
1910 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1911 &flush_respect, NULL);
1914 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1916 GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
1917 GNUNET_SCHEDULER_PRIORITY_HIGH,
1918 &cron_flush_respect, NULL);
1923 * Initialize peer management subsystem.
1926 GSF_connected_peer_init_ ()
1928 cp_map = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
1929 peerstore = GNUNET_PEERSTORE_connect (GSF_cfg);
1930 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1931 &cron_flush_respect, NULL);
1936 * Iterator to free peer entries.
1938 * @param cls closure, unused
1939 * @param key current key code
1940 * @param value value in the hash map (peer entry)
1941 * @return #GNUNET_YES (we should continue to iterate)
1944 clean_peer (void *cls,
1945 const struct GNUNET_PeerIdentity *key,
1948 GSF_peer_disconnect_handler_ (NULL, key);
1954 * Shutdown peer management subsystem.
1957 GSF_connected_peer_done_ ()
1959 cron_flush_respect (NULL, NULL);
1960 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1962 GNUNET_CONTAINER_multipeermap_destroy (cp_map);
1964 GNUNET_PEERSTORE_disconnect (peerstore, GNUNET_YES);
1969 * Iterator to remove references to LC entry.
1971 * @param cls the `struct GSF_LocalClient *` to look for
1972 * @param key current key code
1973 * @param value value in the hash map (peer entry)
1974 * @return #GNUNET_YES (we should continue to iterate)
1977 clean_local_client (void *cls,
1978 const struct GNUNET_PeerIdentity *key,
1981 const struct GSF_LocalClient *lc = cls;
1982 struct GSF_ConnectedPeer *cp = value;
1985 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
1986 if (cp->ppd.last_client_replies[i] == lc)
1987 cp->ppd.last_client_replies[i] = NULL;
1993 * Notification that a local client disconnected. Clean up all of our
1994 * references to the given handle.
1996 * @param lc handle to the local client (henceforth invalid)
1999 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
2002 return; /* already cleaned up */
2003 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_local_client,
2008 /* end of gnunet-service-fs_cp.c */