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.
22 * @file fs/gnunet-service-fs_cp.c
23 * @brief API to handle 'connected peers'
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_load_lib.h"
29 #include "gnunet-service-fs.h"
30 #include "gnunet-service-fs_cp.h"
31 #include "gnunet-service-fs_pe.h"
32 #include "gnunet-service-fs_pr.h"
33 #include "gnunet-service-fs_push.h"
34 #include "gnunet_peerstore_service.h"
38 * Ratio for moving average delay calculation. The previous
39 * average goes in with a factor of (n-1) into the calculation.
42 #define RUNAVG_DELAY_N 16
45 * How often do we flush respect values to disk?
47 #define RESPECT_FLUSH_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
50 * After how long do we discard a reply?
52 #define REPLY_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
55 * Collect an instane number of statistics? May cause excessive IPC.
57 #define INSANE_STATISTICS GNUNET_NO
61 * Handle to cancel a transmission request.
63 struct GSF_PeerTransmitHandle
67 * Kept in a doubly-linked list.
69 struct GSF_PeerTransmitHandle *next;
72 * Kept in a doubly-linked list.
74 struct GSF_PeerTransmitHandle *prev;
77 * Time when this transmission request was issued.
79 struct GNUNET_TIME_Absolute transmission_request_start_time;
82 * Timeout for this request.
84 struct GNUNET_TIME_Absolute timeout;
87 * Task called on timeout, or 0 for none.
89 struct GNUNET_SCHEDULER_Task *timeout_task;
92 * Function to call to get the actual message.
94 GSF_GetMessageCallback gmc;
97 * Peer this request targets.
99 struct GSF_ConnectedPeer *cp;
102 * Closure for @e gmc.
107 * Size of the message to be transmitted.
112 * #GNUNET_YES if this is a query, #GNUNET_NO for content.
117 * Did we get a reservation already?
122 * Priority of this request.
130 * Handle for an entry in our delay list.
132 struct GSF_DelayedHandle
136 * Kept in a doubly-linked list.
138 struct GSF_DelayedHandle *next;
141 * Kept in a doubly-linked list.
143 struct GSF_DelayedHandle *prev;
146 * Peer this transmission belongs to.
148 struct GSF_ConnectedPeer *cp;
151 * The PUT that was delayed.
153 struct PutMessage *pm;
156 * Task for the delay.
158 struct GNUNET_SCHEDULER_Task *delay_task;
161 * Size of the message.
169 * Information per peer and request.
175 * Handle to generic request.
177 struct GSF_PendingRequest *pr;
180 * Handle to specific peer.
182 struct GSF_ConnectedPeer *cp;
185 * Task for asynchronous stopping of this request.
187 struct GNUNET_SCHEDULER_Task *kill_task;
195 struct GSF_ConnectedPeer
199 * Performance data for this peer.
201 struct GSF_PeerPerformanceData ppd;
204 * Time until when we blocked this peer from migrating
207 struct GNUNET_TIME_Absolute last_migration_block;
210 * Task scheduled to revive migration to this peer.
212 struct GNUNET_SCHEDULER_Task *mig_revive_task;
215 * Messages (replies, queries, content migration) we would like to
216 * send to this peer in the near future. Sorted by priority, head.
218 struct GSF_PeerTransmitHandle *pth_head;
221 * Messages (replies, queries, content migration) we would like to
222 * send to this peer in the near future. Sorted by priority, tail.
224 struct GSF_PeerTransmitHandle *pth_tail;
227 * Messages (replies, queries, content migration) we would like to
228 * send to this peer in the near future. Sorted by priority, head.
230 struct GSF_DelayedHandle *delayed_head;
233 * Messages (replies, queries, content migration) we would like to
234 * send to this peer in the near future. Sorted by priority, tail.
236 struct GSF_DelayedHandle *delayed_tail;
239 * Migration stop message in our queue, or NULL if we have none pending.
241 struct GSF_PeerTransmitHandle *migration_pth;
244 * Context of our GNUNET_ATS_reserve_bandwidth call (or NULL).
246 struct GNUNET_ATS_ReservationContext *rc;
249 * Task scheduled if we need to retry bandwidth reservation later.
251 struct GNUNET_SCHEDULER_Task *rc_delay_task;
254 * Active requests from this neighbour, map of query to 'struct PeerRequest'.
256 struct GNUNET_CONTAINER_MultiHashMap *request_map;
259 * Handle for an active request for transmission to this
260 * peer, or NULL (if core queue was full).
262 struct GNUNET_CORE_TransmitHandle *cth;
265 * Increase in traffic preference still to be submitted
266 * to the core service for this peer.
268 uint64_t inc_preference;
271 * Set to 1 if we're currently in the process of calling
272 * #GNUNET_CORE_notify_transmit_ready() (so while @e cth is
273 * NULL, we should not call notify_transmit_ready for this
276 unsigned int cth_in_progress;
279 * Number of entries in @e delayed_head DLL.
281 unsigned int delay_queue_size;
284 * Respect rating for this peer on disk.
286 uint32_t disk_respect;
289 * Which offset in "last_p2p_replies" will be updated next?
290 * (we go round-robin).
292 unsigned int last_p2p_replies_woff;
295 * Which offset in "last_client_replies" will be updated next?
296 * (we go round-robin).
298 unsigned int last_client_replies_woff;
301 * Current offset into 'last_request_times' ring buffer.
303 unsigned int last_request_times_off;
306 * #GNUNET_YES if we did successfully reserve 32k bandwidth,
312 * Function called when the creation of this record is complete.
314 GSF_ConnectedPeerCreationCallback creation_cb;
317 * Closure for @e creation_cb
319 void *creation_cb_cls;
322 * Handle to the PEERSTORE iterate request for peer respect value
324 struct GNUNET_PEERSTORE_IterateContext *respect_iterate_req;
330 * Map from peer identities to 'struct GSF_ConnectPeer' entries.
332 static struct GNUNET_CONTAINER_MultiPeerMap *cp_map;
335 * Handle to peerstore service.
337 static struct GNUNET_PEERSTORE_Handle *peerstore;
341 * Update the latency information kept for the given peer.
343 * @param id peer record to update
344 * @param latency current latency value
347 GSF_update_peer_latency_ (const struct GNUNET_PeerIdentity *id,
348 struct GNUNET_TIME_Relative latency)
350 struct GSF_ConnectedPeer *cp;
352 cp = GSF_peer_get_ (id);
354 return; /* we're not yet connected at the core level, ignore */
355 GNUNET_LOAD_value_set_decline (cp->ppd.transmission_delay, latency);
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) && (GNUNET_YES != pth->was_reserved))
433 /* query, need reservation */
434 if (GNUNET_YES != cp->did_reserve)
435 return; /* not ready */
436 cp->did_reserve = GNUNET_NO;
437 /* reservation already done! */
438 pth->was_reserved = GNUNET_YES;
440 GNUNET_ATS_reserve_bandwidth (GSF_ats, &target, DBLOCK_SIZE,
441 &ats_reserve_callback, cp);
444 GNUNET_assert (NULL == cp->cth);
445 cp->cth_in_progress++;
447 GNUNET_CORE_notify_transmit_ready (GSF_core,
449 GNUNET_CORE_PRIO_BACKGROUND,
450 GNUNET_TIME_absolute_get_remaining
454 &peer_transmit_ready_cb, cp);
455 GNUNET_assert (NULL != cp->cth);
456 GNUNET_assert (0 < cp->cth_in_progress--);
461 * Core is ready to transmit to a peer, get the message.
463 * @param cls the `struct GSF_PeerTransmitHandle` of the message
464 * @param size number of bytes core is willing to take
465 * @param buf where to copy the message
466 * @return number of bytes copied to @a buf
469 peer_transmit_ready_cb (void *cls,
473 struct GSF_ConnectedPeer *cp = cls;
474 struct GSF_PeerTransmitHandle *pth = cp->pth_head;
475 struct GSF_PeerTransmitHandle *pos;
481 if (pth->size > size)
483 schedule_transmission (pth);
486 if (NULL != pth->timeout_task)
488 GNUNET_SCHEDULER_cancel (pth->timeout_task);
489 pth->timeout_task = NULL;
491 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
494 if (GNUNET_YES == pth->is_query)
496 cp->ppd.last_request_times[(cp->last_request_times_off++) %
497 MAX_QUEUE_PER_PEER] =
498 GNUNET_TIME_absolute_get ();
499 GNUNET_assert (0 < cp->ppd.pending_queries--);
501 else if (GNUNET_NO == pth->is_query)
503 GNUNET_assert (0 < cp->ppd.pending_replies--);
505 GNUNET_LOAD_update (cp->ppd.transmission_delay,
506 GNUNET_TIME_absolute_get_duration
507 (pth->transmission_request_start_time).rel_value_us);
508 ret = pth->gmc (pth->gmc_cls, size, buf);
509 if (NULL != (pos = cp->pth_head))
511 GNUNET_assert (pos != pth);
512 schedule_transmission (pos);
520 * (re)try to reserve bandwidth from the given peer.
522 * @param cls the `struct GSF_ConnectedPeer` to reserve from
523 * @param tc scheduler context
526 retry_reservation (void *cls,
527 const struct GNUNET_SCHEDULER_TaskContext *tc)
529 struct GSF_ConnectedPeer *cp = cls;
530 struct GNUNET_PeerIdentity target;
532 GNUNET_PEER_resolve (cp->ppd.pid, &target);
533 cp->rc_delay_task = NULL;
535 GNUNET_ATS_reserve_bandwidth (GSF_ats,
538 &ats_reserve_callback, cp);
543 * Function called by core upon success or failure of our bandwidth reservation request.
545 * @param cls the `struct GSF_ConnectedPeer` of the peer for which we made the request
546 * @param peer identifies the peer
547 * @param amount set to the amount that was actually reserved or unreserved;
548 * either the full requested amount or zero (no partial reservations)
549 * @param res_delay if the reservation could not be satisfied (amount was 0), how
550 * long should the client wait until re-trying?
553 ats_reserve_callback (void *cls,
554 const struct GNUNET_PeerIdentity *peer,
556 struct GNUNET_TIME_Relative res_delay)
558 struct GSF_ConnectedPeer *cp = cls;
559 struct GSF_PeerTransmitHandle *pth;
561 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
562 "Reserved %d bytes / need to wait %s for reservation\n",
564 GNUNET_STRINGS_relative_time_to_string (res_delay, GNUNET_YES));
569 GNUNET_SCHEDULER_add_delayed (res_delay, &retry_reservation, cp);
572 cp->did_reserve = GNUNET_YES;
574 if ((NULL != pth) && (NULL == cp->cth) && (0 == cp->cth_in_progress))
576 /* reservation success, try transmission now! */
577 cp->cth_in_progress++;
579 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES,
580 GNUNET_CORE_PRIO_BACKGROUND,
581 GNUNET_TIME_absolute_get_remaining
582 (pth->timeout), peer, pth->size,
583 &peer_transmit_ready_cb, cp);
584 GNUNET_assert (NULL != cp->cth);
585 GNUNET_assert (0 < cp->cth_in_progress--);
591 * Function called by PEERSTORE with peer respect record
593 * @param cls handle to connected peer entry
594 * @param record peerstore record information
595 * @param emsg error message, or NULL if no errors
596 * @return #GNUNET_NO to stop iterating since we only expect 0 or 1 records
599 peer_respect_cb (void *cls,
600 const struct GNUNET_PEERSTORE_Record *record,
603 struct GSF_ConnectedPeer *cp = cls;
605 cp->respect_iterate_req = NULL;
606 if ((NULL != record) && (sizeof (cp->disk_respect) == record->value_size))
607 cp->disk_respect = cp->ppd.respect = *((uint32_t *)record->value);
608 GSF_push_start_ (cp);
609 if (NULL != cp->creation_cb)
610 cp->creation_cb (cp->creation_cb_cls, cp);
616 * A peer connected to us. Setup the connected peer
619 * @param peer identity of peer that connected
620 * @param creation_cb callback function when the record is created.
621 * @param creation_cb_cls closure for @creation_cb
624 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
625 GSF_ConnectedPeerCreationCallback creation_cb,
626 void *creation_cb_cls)
628 struct GSF_ConnectedPeer *cp;
630 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
631 "Connected to peer %s\n",
633 cp = GNUNET_new (struct GSF_ConnectedPeer);
634 cp->ppd.pid = GNUNET_PEER_intern (peer);
635 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
637 GNUNET_ATS_reserve_bandwidth (GSF_ats, peer, DBLOCK_SIZE,
638 &ats_reserve_callback, cp);
639 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128, GNUNET_NO);
640 GNUNET_break (GNUNET_OK ==
641 GNUNET_CONTAINER_multipeermap_put (cp_map,
642 GSF_connected_peer_get_identity2_ (cp),
644 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
645 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
646 GNUNET_CONTAINER_multipeermap_size (cp_map),
648 cp->creation_cb = creation_cb;
649 cp->creation_cb_cls = creation_cb_cls;
650 cp->respect_iterate_req =
651 GNUNET_PEERSTORE_iterate (peerstore, "fs", peer, "respect",
652 GNUNET_TIME_UNIT_FOREVER_REL, &peer_respect_cb,
658 * It may be time to re-start migrating content to this
659 * peer. Check, and if so, restart migration.
661 * @param cls the `struct GSF_ConnectedPeer`
662 * @param tc scheduler context
665 revive_migration (void *cls,
666 const struct GNUNET_SCHEDULER_TaskContext *tc)
668 struct GSF_ConnectedPeer *cp = cls;
669 struct GNUNET_TIME_Relative bt;
671 cp->mig_revive_task = NULL;
672 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
673 if (0 != bt.rel_value_us)
675 /* still time left... */
676 cp->mig_revive_task =
677 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
680 GSF_push_start_ (cp);
685 * Get a handle for a connected peer.
687 * @param peer peer's identity
688 * @return NULL if the peer is not currently connected
690 struct GSF_ConnectedPeer *
691 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
695 return GNUNET_CONTAINER_multipeermap_get (cp_map, peer);
700 * Handle P2P "MIGRATION_STOP" message.
702 * @param cls closure, always NULL
703 * @param other the other peer involved (sender or receiver, NULL
704 * for loopback messages where we are both sender and receiver)
705 * @param message the actual message
706 * @return #GNUNET_OK to keep the connection open,
707 * #GNUNET_SYSERR to close it (signal serious error)
710 GSF_handle_p2p_migration_stop_ (void *cls,
711 const struct GNUNET_PeerIdentity *other,
712 const struct GNUNET_MessageHeader *message)
714 struct GSF_ConnectedPeer *cp;
715 const struct MigrationStopMessage *msm;
716 struct GNUNET_TIME_Relative bt;
718 msm = (const struct MigrationStopMessage *) message;
719 cp = GSF_peer_get_ (other);
725 GNUNET_STATISTICS_update (GSF_stats,
726 gettext_noop ("# migration stop messages received"),
728 bt = GNUNET_TIME_relative_ntoh (msm->duration);
729 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
730 _("Migration of content to peer `%s' blocked for %s\n"),
732 GNUNET_STRINGS_relative_time_to_string (bt, GNUNET_YES));
733 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
734 if (NULL == cp->mig_revive_task)
737 cp->mig_revive_task =
738 GNUNET_SCHEDULER_add_delayed (bt,
739 &revive_migration, cp);
746 * Copy reply and free put message.
748 * @param cls the `struct PutMessage`
749 * @param buf_size number of bytes available in @a buf
750 * @param buf where to copy the message, NULL on error (peer disconnect)
751 * @return number of bytes copied to @a buf, can be 0 (without indicating an error)
754 copy_reply (void *cls,
758 struct PutMessage *pm = cls;
763 GNUNET_assert (buf_size >= ntohs (pm->header.size));
764 size = ntohs (pm->header.size);
765 memcpy (buf, pm, size);
766 GNUNET_STATISTICS_update (GSF_stats,
768 ("# replies transmitted to other peers"), 1,
774 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# replies dropped"), 1,
783 * Free resources associated with the given peer request.
785 * @param peerreq request to free
786 * @param query associated key for the request
789 free_pending_request (struct PeerRequest *peerreq,
790 const struct GNUNET_HashCode *query)
792 struct GSF_ConnectedPeer *cp = peerreq->cp;
794 if (NULL != peerreq->kill_task)
796 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
797 peerreq->kill_task = NULL;
799 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
801 GNUNET_break (GNUNET_YES ==
802 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
804 GNUNET_free (peerreq);
809 * Cancel all requests associated with the peer.
812 * @param query hash code of the request
813 * @param value the `struct GSF_PendingRequest`
814 * @return #GNUNET_YES (continue to iterate)
817 cancel_pending_request (void *cls,
818 const struct GNUNET_HashCode *query,
821 struct PeerRequest *peerreq = value;
822 struct GSF_PendingRequest *pr = peerreq->pr;
823 struct GSF_PendingRequestData *prd;
825 prd = GSF_pending_request_get_data_ (pr);
826 GSF_pending_request_cancel_ (pr, GNUNET_NO);
827 free_pending_request (peerreq, &prd->query);
833 * Free the given request.
835 * @param cls the request to free
836 * @param tc task context
839 peer_request_destroy (void *cls,
840 const struct GNUNET_SCHEDULER_TaskContext *tc)
842 struct PeerRequest *peerreq = cls;
843 struct GSF_PendingRequest *pr = peerreq->pr;
844 struct GSF_PendingRequestData *prd;
846 peerreq->kill_task = NULL;
847 prd = GSF_pending_request_get_data_ (pr);
848 cancel_pending_request (NULL, &prd->query, peerreq);
853 * The artificial delay is over, transmit the message now.
855 * @param cls the `struct GSF_DelayedHandle` with the message
856 * @param tc scheduler context
859 transmit_delayed_now (void *cls,
860 const struct GNUNET_SCHEDULER_TaskContext *tc)
862 struct GSF_DelayedHandle *dh = cls;
863 struct GSF_ConnectedPeer *cp = dh->cp;
865 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
868 cp->delay_queue_size--;
869 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
871 GNUNET_free (dh->pm);
875 (void) GSF_peer_transmit_ (cp,
887 * Get the randomized delay a response should be subjected to.
889 * @return desired delay
891 static struct GNUNET_TIME_Relative
892 get_randomized_delay ()
894 struct GNUNET_TIME_Relative ret;
897 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
898 GNUNET_CRYPTO_random_u32
899 (GNUNET_CRYPTO_QUALITY_WEAK,
900 2 * GSF_avg_latency.rel_value_us + 1));
901 #if INSANE_STATISTICS
902 GNUNET_STATISTICS_update (GSF_stats,
904 ("# artificial delays introduced (ms)"),
905 ret.rel_value_us / 1000LL, GNUNET_NO);
912 * Handle a reply to a pending request. Also called if a request
913 * expires (then with data == NULL). The handler may be called
914 * many times (depending on the request type), but will not be
915 * called during or after a call to GSF_pending_request_cancel
916 * and will also not be called anymore after a call signalling
919 * @param cls `struct PeerRequest` this is an answer for
920 * @param eval evaluation of the result
921 * @param pr handle to the original pending request
922 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
923 * @param expiration when does @a data expire?
924 * @param last_transmission when did we last transmit a request for this block
925 * @param type type of the block
926 * @param data response data, NULL on request expiration
927 * @param data_len number of bytes in @a data
930 handle_p2p_reply (void *cls,
931 enum GNUNET_BLOCK_EvaluationResult eval,
932 struct GSF_PendingRequest *pr,
933 uint32_t reply_anonymity_level,
934 struct GNUNET_TIME_Absolute expiration,
935 struct GNUNET_TIME_Absolute last_transmission,
936 enum GNUNET_BLOCK_Type type,
940 struct PeerRequest *peerreq = cls;
941 struct GSF_ConnectedPeer *cp = peerreq->cp;
942 struct GSF_PendingRequestData *prd;
943 struct PutMessage *pm;
946 GNUNET_assert (data_len + sizeof (struct PutMessage) <
947 GNUNET_SERVER_MAX_MESSAGE_SIZE);
948 GNUNET_assert (peerreq->pr == pr);
949 prd = GSF_pending_request_get_data_ (pr);
952 free_pending_request (peerreq, &prd->query);
955 GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
956 if ((prd->type != type) && (GNUNET_BLOCK_TYPE_ANY != prd->type))
958 GNUNET_STATISTICS_update (GSF_stats,
960 ("# replies dropped due to type mismatch"),
964 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
965 "Transmitting result for query `%s' to peer\n",
966 GNUNET_h2s (&prd->query));
967 GNUNET_STATISTICS_update (GSF_stats,
968 gettext_noop ("# replies received for other peers"),
970 msize = sizeof (struct PutMessage) + data_len;
971 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
976 if ((UINT32_MAX != reply_anonymity_level) && (reply_anonymity_level > 1))
978 if (reply_anonymity_level - 1 > GSF_cover_content_count)
980 GNUNET_STATISTICS_update (GSF_stats,
982 ("# replies dropped due to insufficient cover traffic"),
986 GSF_cover_content_count -= (reply_anonymity_level - 1);
989 pm = GNUNET_malloc (msize);
990 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
991 pm->header.size = htons (msize);
992 pm->type = htonl (type);
993 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
994 memcpy (&pm[1], data, data_len);
995 if ( (UINT32_MAX != reply_anonymity_level) &&
996 (0 != reply_anonymity_level) &&
997 (GNUNET_YES == GSF_enable_randomized_delays) )
999 struct GSF_DelayedHandle *dh;
1001 dh = GNUNET_new (struct GSF_DelayedHandle);
1005 GNUNET_CONTAINER_DLL_insert (cp->delayed_head,
1008 cp->delay_queue_size++;
1010 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
1011 &transmit_delayed_now,
1016 (void) GSF_peer_transmit_ (cp,
1024 if (GNUNET_BLOCK_EVALUATION_OK_LAST != eval)
1026 if (NULL == peerreq->kill_task)
1028 GNUNET_STATISTICS_update (GSF_stats,
1030 ("# P2P searches destroyed due to ultimate reply"),
1032 peerreq->kill_task =
1033 GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
1039 * Increase the peer's respect by a value.
1041 * @param cp which peer to change the respect value on
1042 * @param value is the int value by which the
1043 * peer's credit is to be increased or decreased
1044 * @returns the actual change in respect (positive or negative)
1047 change_peer_respect (struct GSF_ConnectedPeer *cp, int value)
1051 GNUNET_assert (NULL != cp);
1054 if (cp->ppd.respect + value < cp->ppd.respect)
1056 value = UINT32_MAX - cp->ppd.respect;
1057 cp->ppd.respect = UINT32_MAX;
1060 cp->ppd.respect += value;
1064 if (cp->ppd.respect < -value)
1066 value = -cp->ppd.respect;
1067 cp->ppd.respect = 0;
1070 cp->ppd.respect += value;
1077 * We've received a request with the specified priority. Bound it
1078 * according to how much we respect the given peer.
1080 * @param prio_in requested priority
1081 * @param cp the peer making the request
1082 * @return effective priority
1085 bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
1087 #define N ((double)128.0)
1092 ld = GSF_test_get_load_too_high_ (0);
1093 if (GNUNET_SYSERR == ld)
1095 #if INSANE_STATISTICS
1096 GNUNET_STATISTICS_update (GSF_stats,
1098 ("# requests done for free (low load)"), 1,
1101 return 0; /* excess resources */
1103 if (prio_in > INT32_MAX)
1104 prio_in = INT32_MAX;
1105 ret = -change_peer_respect (cp, -(int) prio_in);
1108 if (ret > GSF_current_priorities + N)
1109 rret = GSF_current_priorities + N;
1112 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1114 if ((GNUNET_YES == ld) && (ret > 0))
1116 /* try with charging */
1117 ld = GSF_test_get_load_too_high_ (ret);
1119 if (GNUNET_YES == ld)
1121 GNUNET_STATISTICS_update (GSF_stats,
1123 ("# request dropped, priority insufficient"), 1,
1126 change_peer_respect (cp, (int) ret);
1127 return -1; /* not enough resources */
1131 GNUNET_STATISTICS_update (GSF_stats,
1133 ("# requests done for a price (normal load)"), 1,
1142 * The priority level imposes a bound on the maximum
1143 * value for the ttl that can be requested.
1145 * @param ttl_in requested ttl
1146 * @param prio given priority
1147 * @return ttl_in if ttl_in is below the limit,
1148 * otherwise the ttl-limit for the given priority
1151 bound_ttl (int32_t ttl_in, uint32_t prio)
1153 unsigned long long allowed;
1157 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1158 if (ttl_in > allowed)
1160 if (allowed >= (1 << 30))
1169 * Handle P2P "QUERY" message. Creates the pending request entry
1170 * and sets up all of the data structures to that we will
1171 * process replies properly. Does not initiate forwarding or
1172 * local database lookups.
1174 * @param other the other peer involved (sender or receiver, NULL
1175 * for loopback messages where we are both sender and receiver)
1176 * @param message the actual message
1177 * @return pending request handle, NULL on error
1179 struct GSF_PendingRequest *
1180 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1181 const struct GNUNET_MessageHeader *message)
1183 struct PeerRequest *peerreq;
1184 struct GSF_PendingRequest *pr;
1185 struct GSF_PendingRequestData *prd;
1186 struct GSF_ConnectedPeer *cp;
1187 struct GSF_ConnectedPeer *cps;
1188 const struct GNUNET_PeerIdentity *target;
1189 enum GSF_PendingRequestOptions options;
1191 const struct GetMessage *gm;
1193 const struct GNUNET_PeerIdentity *opt;
1196 uint32_t ttl_decrement;
1199 enum GNUNET_BLOCK_Type type;
1200 GNUNET_PEER_Id spid;
1202 msize = ntohs (message->size);
1203 if (msize < sizeof (struct GetMessage))
1205 GNUNET_break_op (0);
1208 GNUNET_STATISTICS_update (GSF_stats,
1210 ("# GET requests received (from other peers)"),
1213 gm = (const struct GetMessage *) message;
1214 type = ntohl (gm->type);
1215 bm = ntohl (gm->hash_bitmap);
1223 if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_PeerIdentity))
1225 GNUNET_break_op (0);
1228 opt = (const struct GNUNET_PeerIdentity *) &gm[1];
1229 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_PeerIdentity);
1230 /* bfsize must be power of 2, check! */
1231 if (0 != ((bfsize - 1) & bfsize))
1233 GNUNET_break_op (0);
1236 GSF_cover_query_count++;
1237 bm = ntohl (gm->hash_bitmap);
1239 cps = GSF_peer_get_ (other);
1242 /* peer must have just disconnected */
1243 GNUNET_STATISTICS_update (GSF_stats,
1245 ("# requests dropped due to initiator not being connected"),
1249 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1250 cp = GSF_peer_get_ (&opt[bits++]);
1255 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1256 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1257 "Failed to find RETURN-TO peer `%s' in connection set. Dropping query.\n",
1258 GNUNET_i2s (&opt[bits - 1]));
1261 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1262 "Failed to find peer `%s' in connection set. Dropping query.\n",
1263 GNUNET_i2s (other));
1264 GNUNET_STATISTICS_update (GSF_stats,
1266 ("# requests dropped due to missing reverse route"),
1271 if (cp->ppd.pending_replies + cp->delay_queue_size > 128)
1273 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1274 "Peer `%s' has too many replies queued already. Dropping query.\n",
1275 GNUNET_i2s (other));
1276 GNUNET_STATISTICS_update (GSF_stats,
1277 gettext_noop ("# requests dropped due to full reply queue"),
1282 /* note that we can really only check load here since otherwise
1283 * peers could find out that we are overloaded by not being
1284 * disconnected after sending us a malformed query... */
1285 priority = bound_priority (ntohl (gm->priority),
1289 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1290 "Dropping query from `%s', this peer is too busy.\n",
1291 GNUNET_i2s (other));
1294 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1295 "Received request for `%s' of type %u from peer `%s' with flags %u\n",
1296 GNUNET_h2s (&gm->query),
1297 (unsigned int) type,
1302 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? (&opt[bits++]) : NULL;
1303 options = GSF_PRO_DEFAULTS;
1305 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
1306 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1307 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value_us * 2 +
1308 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1310 /* don't have BW to send to peer, or would likely take longer than we have for it,
1311 * so at best indirect the query */
1313 options |= GSF_PRO_FORWARD_ONLY;
1314 spid = GNUNET_PEER_intern (other);
1315 GNUNET_assert (0 != spid);
1317 ttl = bound_ttl (ntohl (gm->ttl), priority);
1318 /* decrement ttl (always) */
1320 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1322 if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
1324 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1325 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1326 GNUNET_i2s (other), ttl, ttl_decrement);
1327 GNUNET_STATISTICS_update (GSF_stats,
1329 ("# requests dropped due TTL underflow"), 1,
1331 /* integer underflow => drop (should be very rare)! */
1334 ttl -= ttl_decrement;
1336 /* test if the request already exists */
1337 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map, &gm->query);
1338 if (peerreq != NULL)
1341 prd = GSF_pending_request_get_data_ (pr);
1342 if (prd->type == type)
1344 if (prd->ttl.abs_value_us >= GNUNET_TIME_absolute_get ().abs_value_us + ttl * 1000LL)
1346 /* existing request has higher TTL, drop new one! */
1347 prd->priority += priority;
1348 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1349 "Have existing request with higher TTL, dropping new request.\n",
1350 GNUNET_i2s (other));
1351 GNUNET_STATISTICS_update (GSF_stats,
1353 ("# requests dropped due to higher-TTL request"),
1357 /* existing request has lower TTL, drop old one! */
1358 priority += prd->priority;
1359 GSF_pending_request_cancel_ (pr, GNUNET_YES);
1360 free_pending_request (peerreq, &gm->query);
1364 peerreq = GNUNET_new (struct PeerRequest);
1366 pr = GSF_pending_request_create_ (options, type, &gm->query,
1369 0) ? (const char *) &opt[bits] : NULL,
1370 bfsize, ntohl (gm->filter_mutator),
1372 (uint32_t) priority, ttl, spid, GNUNET_PEER_intern (other), NULL, 0, /* replies_seen */
1373 &handle_p2p_reply, peerreq);
1374 GNUNET_assert (NULL != pr);
1376 GNUNET_break (GNUNET_OK ==
1377 GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
1379 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1380 GNUNET_STATISTICS_update (GSF_stats,
1382 ("# P2P query messages received and processed"), 1,
1384 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
1391 * Function called if there has been a timeout trying to satisfy
1392 * a transmission request.
1394 * @param cls the `struct GSF_PeerTransmitHandle` of the request
1395 * @param tc scheduler context
1398 peer_transmit_timeout (void *cls,
1399 const struct GNUNET_SCHEDULER_TaskContext *tc)
1401 struct GSF_PeerTransmitHandle *pth = cls;
1402 struct GSF_ConnectedPeer *cp;
1404 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1405 "Timeout trying to transmit to other peer\n");
1406 pth->timeout_task = NULL;
1408 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1411 if (GNUNET_YES == pth->is_query)
1412 GNUNET_assert (0 < cp->ppd.pending_queries--);
1413 else if (GNUNET_NO == pth->is_query)
1414 GNUNET_assert (0 < cp->ppd.pending_replies--);
1415 GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
1416 if (NULL != cp->cth)
1418 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1421 pth->gmc (pth->gmc_cls, 0, NULL);
1422 GNUNET_assert (0 == cp->cth_in_progress);
1428 * Transmit a message to the given peer as soon as possible.
1429 * If the peer disconnects before the transmission can happen,
1430 * the callback is invoked with a `NULL` @a buffer.
1432 * @param cp target peer
1433 * @param is_query is this a query (#GNUNET_YES) or content (#GNUNET_NO) or neither (#GNUNET_SYSERR)
1434 * @param priority how important is this request?
1435 * @param timeout when does this request timeout (call gmc with error)
1436 * @param size number of bytes we would like to send to the peer
1437 * @param gmc function to call to get the message
1438 * @param gmc_cls closure for @a gmc
1439 * @return handle to cancel request
1441 struct GSF_PeerTransmitHandle *
1442 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
1445 struct GNUNET_TIME_Relative timeout,
1447 GSF_GetMessageCallback gmc, void *gmc_cls)
1449 struct GSF_PeerTransmitHandle *pth;
1450 struct GSF_PeerTransmitHandle *pos;
1451 struct GSF_PeerTransmitHandle *prev;
1453 pth = GNUNET_new (struct GSF_PeerTransmitHandle);
1454 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1455 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1457 pth->gmc_cls = gmc_cls;
1459 pth->is_query = is_query;
1460 pth->priority = priority;
1462 /* insertion sort (by priority, descending) */
1465 while ((NULL != pos) && (pos->priority > priority))
1470 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head,
1474 if (GNUNET_YES == is_query)
1475 cp->ppd.pending_queries++;
1476 else if (GNUNET_NO == is_query)
1477 cp->ppd.pending_replies++;
1479 = GNUNET_SCHEDULER_add_delayed (timeout,
1480 &peer_transmit_timeout,
1482 schedule_transmission (pth);
1488 * Cancel an earlier request for transmission.
1490 * @param pth request to cancel
1493 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1495 struct GSF_ConnectedPeer *cp;
1497 if (NULL != pth->timeout_task)
1499 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1500 pth->timeout_task = NULL;
1503 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1506 if (GNUNET_YES == pth->is_query)
1507 GNUNET_assert (0 < cp->ppd.pending_queries--);
1508 else if (GNUNET_NO == pth->is_query)
1509 GNUNET_assert (0 < cp->ppd.pending_replies--);
1515 * Report on receiving a reply; update the performance record of the given peer.
1517 * @param cp responding peer (will be updated)
1518 * @param request_time time at which the original query was transmitted
1519 * @param request_priority priority of the original request
1522 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1523 struct GNUNET_TIME_Absolute request_time,
1524 uint32_t request_priority)
1526 struct GNUNET_TIME_Relative delay;
1528 delay = GNUNET_TIME_absolute_get_duration (request_time);
1529 cp->ppd.avg_reply_delay.rel_value_us =
1530 (cp->ppd.avg_reply_delay.rel_value_us * (RUNAVG_DELAY_N - 1) +
1531 delay.rel_value_us) / RUNAVG_DELAY_N;
1532 cp->ppd.avg_priority =
1533 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1534 request_priority) / RUNAVG_DELAY_N;
1539 * Report on receiving a reply in response to an initiating client.
1540 * Remember that this peer is good for this client.
1542 * @param cp responding peer (will be updated)
1543 * @param initiator_client local client on responsible for query
1546 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1547 struct GSF_LocalClient *initiator_client)
1549 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1550 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1555 * Report on receiving a reply in response to an initiating peer.
1556 * Remember that this peer is good for this initiating peer.
1558 * @param cp responding peer (will be updated)
1559 * @param initiator_peer other peer responsible for query
1562 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1563 const struct GSF_ConnectedPeer *initiator_peer)
1567 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1568 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1569 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1570 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1571 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1576 * Write peer-respect information to a file - flush the buffer entry!
1579 * @param key peer identity
1580 * @param value the `struct GSF_ConnectedPeer` to flush
1581 * @return #GNUNET_OK to continue iteration
1584 flush_respect (void *cls,
1585 const struct GNUNET_PeerIdentity *key,
1588 struct GSF_ConnectedPeer *cp = value;
1589 struct GNUNET_PeerIdentity pid;
1591 if (cp->ppd.respect == cp->disk_respect)
1592 return GNUNET_OK; /* unchanged */
1593 GNUNET_assert (0 != cp->ppd.pid);
1594 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1595 GNUNET_PEERSTORE_store (peerstore, "fs", &pid, "respect", &cp->ppd.respect,
1596 sizeof (cp->ppd.respect),
1597 GNUNET_TIME_UNIT_FOREVER_ABS,
1598 GNUNET_PEERSTORE_STOREOPTION_REPLACE, NULL, NULL);
1604 * A peer disconnected from us. Tear down the connected peer
1608 * @param peer identity of peer that connected
1611 GSF_peer_disconnect_handler_ (void *cls,
1612 const struct GNUNET_PeerIdentity *peer)
1614 struct GSF_ConnectedPeer *cp;
1615 struct GSF_PeerTransmitHandle *pth;
1616 struct GSF_DelayedHandle *dh;
1618 cp = GSF_peer_get_ (peer);
1620 return; /* must have been disconnect from core with
1621 * 'peer' == my_id, ignore */
1622 flush_respect (NULL, peer, cp);
1623 GNUNET_assert (GNUNET_YES ==
1624 GNUNET_CONTAINER_multipeermap_remove (cp_map,
1627 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
1628 GNUNET_CONTAINER_multipeermap_size (cp_map),
1630 if (NULL != cp->respect_iterate_req)
1632 GNUNET_PEERSTORE_iterate_cancel (cp->respect_iterate_req);
1633 cp->respect_iterate_req = NULL;
1635 if (NULL != cp->migration_pth)
1637 GSF_peer_transmit_cancel_ (cp->migration_pth);
1638 cp->migration_pth = NULL;
1642 GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
1645 if (NULL != cp->rc_delay_task)
1647 GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
1648 cp->rc_delay_task = NULL;
1650 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1651 &cancel_pending_request, cp);
1652 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1653 cp->request_map = NULL;
1654 GSF_plan_notify_peer_disconnect_ (cp);
1655 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1656 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1657 memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
1658 GSF_push_stop_ (cp);
1659 if (NULL != cp->cth)
1661 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1664 GNUNET_assert (0 == cp->cth_in_progress);
1665 while (NULL != (pth = cp->pth_head))
1667 if (pth->timeout_task != NULL)
1669 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1670 pth->timeout_task = NULL;
1672 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1675 if (GNUNET_YES == pth->is_query)
1676 GNUNET_assert (0 < cp->ppd.pending_queries--);
1677 else if (GNUNET_NO == pth->is_query)
1678 GNUNET_assert (0 < cp->ppd.pending_replies--);
1679 pth->gmc (pth->gmc_cls, 0, NULL);
1682 while (NULL != (dh = cp->delayed_head))
1684 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
1687 cp->delay_queue_size--;
1688 GNUNET_SCHEDULER_cancel (dh->delay_task);
1689 GNUNET_free (dh->pm);
1692 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1693 if (NULL != cp->mig_revive_task)
1695 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1696 cp->mig_revive_task = NULL;
1698 GNUNET_break (0 == cp->ppd.pending_queries);
1699 GNUNET_break (0 == cp->ppd.pending_replies);
1705 * Closure for #call_iterator().
1707 struct IterationContext
1710 * Function to call on each entry.
1712 GSF_ConnectedPeerIterator it;
1715 * Closure for @e it.
1722 * Function that calls the callback for each peer.
1724 * @param cls the `struct IterationContext *`
1725 * @param key identity of the peer
1726 * @param value the `struct GSF_ConnectedPeer *`
1727 * @return #GNUNET_YES to continue iteration
1730 call_iterator (void *cls,
1731 const struct GNUNET_PeerIdentity *key,
1734 struct IterationContext *ic = cls;
1735 struct GSF_ConnectedPeer *cp = value;
1745 * Iterate over all connected peers.
1747 * @param it function to call for each peer
1748 * @param it_cls closure for @a it
1751 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it,
1754 struct IterationContext ic;
1758 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1765 * Obtain the identity of a connected peer.
1767 * @param cp peer to get identity of
1768 * @param id identity to set (written to)
1771 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1772 struct GNUNET_PeerIdentity *id)
1774 GNUNET_assert (0 != cp->ppd.pid);
1775 GNUNET_PEER_resolve (cp->ppd.pid, id);
1780 * Obtain the identity of a connected peer.
1782 * @param cp peer to get identity of
1783 * @return reference to peer identity, valid until peer disconnects (!)
1785 const struct GNUNET_PeerIdentity *
1786 GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp)
1788 GNUNET_assert (0 != cp->ppd.pid);
1789 return GNUNET_PEER_resolve2 (cp->ppd.pid);
1794 * Assemble a migration stop message for transmission.
1796 * @param cls the `struct GSF_ConnectedPeer` to use
1797 * @param size number of bytes we're allowed to write to @a buf
1798 * @param buf where to copy the message
1799 * @return number of bytes copied to @a buf
1802 create_migration_stop_message (void *cls,
1806 struct GSF_ConnectedPeer *cp = cls;
1807 struct MigrationStopMessage msm;
1809 cp->migration_pth = NULL;
1812 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1813 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1814 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1815 msm.reserved = htonl (0);
1817 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1818 (cp->last_migration_block));
1819 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1820 GNUNET_STATISTICS_update (GSF_stats,
1821 gettext_noop ("# migration stop messages sent"),
1823 return sizeof (struct MigrationStopMessage);
1828 * Ask a peer to stop migrating data to us until the given point
1831 * @param cp peer to ask
1832 * @param block_time until when to block
1835 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1836 struct GNUNET_TIME_Absolute block_time)
1838 if (cp->last_migration_block.abs_value_us > block_time.abs_value_us)
1840 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1841 "Migration already blocked for another %s\n",
1842 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining
1843 (cp->last_migration_block), GNUNET_YES));
1844 return; /* already blocked */
1846 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %s\n",
1847 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (block_time),
1849 cp->last_migration_block = block_time;
1850 if (NULL != cp->migration_pth)
1851 GSF_peer_transmit_cancel_ (cp->migration_pth);
1853 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1854 GNUNET_TIME_UNIT_FOREVER_REL,
1855 sizeof (struct MigrationStopMessage),
1856 &create_migration_stop_message, cp);
1861 * Notify core about a preference we have for the given peer
1862 * (to allocate more resources towards it). The change will
1863 * be communicated the next time we reserve bandwidth with
1864 * core (not instantly).
1866 * @param cp peer to reserve bandwidth from
1867 * @param pref preference change
1870 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1873 cp->inc_preference += pref;
1878 * Call this method periodically to flush respect information to disk.
1880 * @param cls closure, not used
1881 * @param tc task context, not used
1884 cron_flush_respect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1889 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &flush_respect, NULL);
1892 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1894 GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
1895 GNUNET_SCHEDULER_PRIORITY_HIGH,
1896 &cron_flush_respect, NULL);
1901 * Initialize peer management subsystem.
1904 GSF_connected_peer_init_ ()
1906 cp_map = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
1907 peerstore = GNUNET_PEERSTORE_connect (GSF_cfg);
1908 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1909 &cron_flush_respect, NULL);
1914 * Iterator to free peer entries.
1916 * @param cls closure, unused
1917 * @param key current key code
1918 * @param value value in the hash map (peer entry)
1919 * @return #GNUNET_YES (we should continue to iterate)
1922 clean_peer (void *cls,
1923 const struct GNUNET_PeerIdentity *key,
1926 GSF_peer_disconnect_handler_ (NULL, key);
1932 * Shutdown peer management subsystem.
1935 GSF_connected_peer_done_ ()
1937 cron_flush_respect (NULL, NULL);
1938 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_peer, NULL);
1939 GNUNET_CONTAINER_multipeermap_destroy (cp_map);
1941 GNUNET_PEERSTORE_disconnect (peerstore, GNUNET_YES);
1946 * Iterator to remove references to LC entry.
1948 * @param cls the `struct GSF_LocalClient *` to look for
1949 * @param key current key code
1950 * @param value value in the hash map (peer entry)
1951 * @return #GNUNET_YES (we should continue to iterate)
1954 clean_local_client (void *cls,
1955 const struct GNUNET_PeerIdentity *key,
1958 const struct GSF_LocalClient *lc = cls;
1959 struct GSF_ConnectedPeer *cp = value;
1962 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
1963 if (cp->ppd.last_client_replies[i] == lc)
1964 cp->ppd.last_client_replies[i] = NULL;
1970 * Notification that a local client disconnected. Clean up all of our
1971 * references to the given handle.
1973 * @param lc handle to the local client (henceforth invalid)
1976 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
1979 return; /* already cleaned up */
1980 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_local_client,
1985 /* end of gnunet-service-fs_cp.c */