2 This file is part of GNUnet.
3 (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.
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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 GNUNET_SCHEDULER_TaskIdentifier 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 GNUNET_SCHEDULER_TaskIdentifier 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 GNUNET_SCHEDULER_TaskIdentifier 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 GNUNET_SCHEDULER_TaskIdentifier 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 GNUNET_SCHEDULER_TaskIdentifier 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 * Respect rating for this peer on disk.
281 uint32_t disk_respect;
284 * Which offset in "last_p2p_replies" will be updated next?
285 * (we go round-robin).
287 unsigned int last_p2p_replies_woff;
290 * Which offset in "last_client_replies" will be updated next?
291 * (we go round-robin).
293 unsigned int last_client_replies_woff;
296 * Current offset into 'last_request_times' ring buffer.
298 unsigned int last_request_times_off;
301 * GNUNET_YES if we did successfully reserve 32k bandwidth,
307 * Function called when the creation of this record is complete.
309 GSF_ConnectedPeerCreationCallback creation_cb;
312 * Closure for @e creation_cb
314 void *creation_cb_cls;
317 * Handle to the PEERSTORE iterate request for peer respect value
319 struct GNUNET_PEERSTORE_IterateContext *respect_iterate_req;
325 * Map from peer identities to 'struct GSF_ConnectPeer' entries.
327 static struct GNUNET_CONTAINER_MultiPeerMap *cp_map;
330 * Handle to peerstore service.
332 static struct GNUNET_PEERSTORE_Handle *peerstore;
336 * Update the latency information kept for the given peer.
338 * @param id peer record to update
339 * @param latency current latency value
342 GSF_update_peer_latency_ (const struct GNUNET_PeerIdentity *id,
343 struct GNUNET_TIME_Relative latency)
345 struct GSF_ConnectedPeer *cp;
347 cp = GSF_peer_get_ (id);
349 return; /* we're not yet connected at the core level, ignore */
350 GNUNET_LOAD_value_set_decline (cp->ppd.transmission_delay, latency);
351 /* LATER: merge atsi into cp's performance data (if we ever care...) */
356 * Return the performance data record for the given peer
358 * @param cp peer to query
359 * @return performance data record for the peer
361 struct GSF_PeerPerformanceData *
362 GSF_get_peer_performance_data_ (struct GSF_ConnectedPeer *cp)
369 * Core is ready to transmit to a peer, get the message.
371 * @param cls the `struct GSF_PeerTransmitHandle` of the message
372 * @param size number of bytes core is willing to take
373 * @param buf where to copy the message
374 * @return number of bytes copied to @a buf
377 peer_transmit_ready_cb (void *cls,
383 * Function called by core upon success or failure of our bandwidth reservation request.
385 * @param cls the `struct GSF_ConnectedPeer` of the peer for which we made the request
386 * @param peer identifies the peer
387 * @param amount set to the amount that was actually reserved or unreserved;
388 * either the full requested amount or zero (no partial reservations)
389 * @param res_delay if the reservation could not be satisfied (amount was 0), how
390 * long should the client wait until re-trying?
393 ats_reserve_callback (void *cls,
394 const struct GNUNET_PeerIdentity *peer,
396 struct GNUNET_TIME_Relative res_delay);
400 * If ready (bandwidth reserved), try to schedule transmission via
401 * core for the given handle.
403 * @param pth transmission handle to schedule
406 schedule_transmission (struct GSF_PeerTransmitHandle *pth)
408 struct GSF_ConnectedPeer *cp;
409 struct GNUNET_PeerIdentity target;
412 if ((NULL != cp->cth) || (0 != cp->cth_in_progress))
413 return; /* already done */
414 GNUNET_assert (0 != cp->ppd.pid);
415 GNUNET_PEER_resolve (cp->ppd.pid, &target);
417 if (0 != cp->inc_preference)
419 GNUNET_ATS_performance_change_preference (GSF_ats, &target, GNUNET_ATS_PREFERENCE_BANDWIDTH,
420 (double) cp->inc_preference,
421 GNUNET_ATS_PREFERENCE_END);
422 cp->inc_preference = 0;
425 if ((GNUNET_YES == pth->is_query) && (GNUNET_YES != pth->was_reserved))
427 /* query, need reservation */
428 if (GNUNET_YES != cp->did_reserve)
429 return; /* not ready */
430 cp->did_reserve = GNUNET_NO;
431 /* reservation already done! */
432 pth->was_reserved = GNUNET_YES;
434 GNUNET_ATS_reserve_bandwidth (GSF_ats, &target, DBLOCK_SIZE,
435 &ats_reserve_callback, cp);
438 GNUNET_assert (NULL == cp->cth);
439 cp->cth_in_progress++;
441 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES,
442 GNUNET_CORE_PRIO_BACKGROUND,
443 GNUNET_TIME_absolute_get_remaining
444 (pth->timeout), &target, pth->size,
445 &peer_transmit_ready_cb, cp);
446 GNUNET_assert (NULL != cp->cth);
447 GNUNET_assert (0 < cp->cth_in_progress--);
452 * Core is ready to transmit to a peer, get the message.
454 * @param cls the `struct GSF_PeerTransmitHandle` of the message
455 * @param size number of bytes core is willing to take
456 * @param buf where to copy the message
457 * @return number of bytes copied to @a buf
460 peer_transmit_ready_cb (void *cls, size_t size, void *buf)
462 struct GSF_ConnectedPeer *cp = cls;
463 struct GSF_PeerTransmitHandle *pth = cp->pth_head;
464 struct GSF_PeerTransmitHandle *pos;
470 if (pth->size > size)
472 schedule_transmission (pth);
475 if (GNUNET_SCHEDULER_NO_TASK != pth->timeout_task)
477 GNUNET_SCHEDULER_cancel (pth->timeout_task);
478 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
480 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
481 if (GNUNET_YES == pth->is_query)
483 cp->ppd.last_request_times[(cp->last_request_times_off++) %
484 MAX_QUEUE_PER_PEER] =
485 GNUNET_TIME_absolute_get ();
486 GNUNET_assert (0 < cp->ppd.pending_queries--);
488 else if (GNUNET_NO == pth->is_query)
490 GNUNET_assert (0 < cp->ppd.pending_replies--);
492 GNUNET_LOAD_update (cp->ppd.transmission_delay,
493 GNUNET_TIME_absolute_get_duration
494 (pth->transmission_request_start_time).rel_value_us);
495 ret = pth->gmc (pth->gmc_cls, size, buf);
496 if (NULL != (pos = cp->pth_head))
498 GNUNET_assert (pos != pth);
499 schedule_transmission (pos);
507 * (re)try to reserve bandwidth from the given peer.
509 * @param cls the `struct GSF_ConnectedPeer` to reserve from
510 * @param tc scheduler context
513 retry_reservation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
515 struct GSF_ConnectedPeer *cp = cls;
516 struct GNUNET_PeerIdentity target;
518 GNUNET_PEER_resolve (cp->ppd.pid, &target);
519 cp->rc_delay_task = GNUNET_SCHEDULER_NO_TASK;
521 GNUNET_ATS_reserve_bandwidth (GSF_ats, &target, DBLOCK_SIZE,
522 &ats_reserve_callback, cp);
527 * Function called by core upon success or failure of our bandwidth reservation request.
529 * @param cls the `struct GSF_ConnectedPeer` of the peer for which we made the request
530 * @param peer identifies the peer
531 * @param amount set to the amount that was actually reserved or unreserved;
532 * either the full requested amount or zero (no partial reservations)
533 * @param res_delay if the reservation could not be satisfied (amount was 0), how
534 * long should the client wait until re-trying?
537 ats_reserve_callback (void *cls,
538 const struct GNUNET_PeerIdentity *peer,
540 struct GNUNET_TIME_Relative res_delay)
542 struct GSF_ConnectedPeer *cp = cls;
543 struct GSF_PeerTransmitHandle *pth;
545 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
546 "Reserved %d bytes / need to wait %s for reservation\n",
548 GNUNET_STRINGS_relative_time_to_string (res_delay, GNUNET_YES));
553 GNUNET_SCHEDULER_add_delayed (res_delay, &retry_reservation, cp);
556 cp->did_reserve = GNUNET_YES;
558 if ((NULL != pth) && (NULL == cp->cth) && (0 == cp->cth_in_progress))
560 /* reservation success, try transmission now! */
561 cp->cth_in_progress++;
563 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES,
564 GNUNET_CORE_PRIO_BACKGROUND,
565 GNUNET_TIME_absolute_get_remaining
566 (pth->timeout), peer, pth->size,
567 &peer_transmit_ready_cb, cp);
568 GNUNET_assert (NULL != cp->cth);
569 GNUNET_assert (0 < cp->cth_in_progress--);
575 * Function called by PEERSTORE with peer respect record
577 * @param cls handle to connected peer entry
578 * @param record peerstore record information
579 * @param emsg error message, or NULL if no errors
580 * @return #GNUNET_NO to stop iterating since we only expect 0 or 1 records
583 peer_respect_cb (void *cls,
584 const struct GNUNET_PEERSTORE_Record *record,
587 struct GSF_ConnectedPeer *cp = cls;
589 cp->respect_iterate_req = NULL;
590 if ((NULL != record) && (sizeof (cp->disk_respect) == record->value_size))
591 cp->disk_respect = cp->ppd.respect = *((uint32_t *)record->value);
592 GSF_push_start_ (cp);
593 if (NULL != cp->creation_cb)
594 cp->creation_cb (cp->creation_cb_cls, cp);
600 * A peer connected to us. Setup the connected peer
603 * @param peer identity of peer that connected
604 * @param creation_cb callback function when the record is created.
605 * @param creation_cb_cls closure for @creation_cb
608 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
609 GSF_ConnectedPeerCreationCallback creation_cb,
610 void *creation_cb_cls)
612 struct GSF_ConnectedPeer *cp;
614 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
615 "Connected to peer %s\n",
617 cp = GNUNET_new (struct GSF_ConnectedPeer);
618 cp->ppd.pid = GNUNET_PEER_intern (peer);
619 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
621 GNUNET_ATS_reserve_bandwidth (GSF_ats, peer, DBLOCK_SIZE,
622 &ats_reserve_callback, cp);
623 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128, GNUNET_NO);
624 GNUNET_break (GNUNET_OK ==
625 GNUNET_CONTAINER_multipeermap_put (cp_map,
626 GSF_connected_peer_get_identity2_ (cp),
628 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
629 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
630 GNUNET_CONTAINER_multipeermap_size (cp_map),
632 cp->creation_cb = creation_cb;
633 cp->creation_cb_cls = creation_cb_cls;
634 cp->respect_iterate_req =
635 GNUNET_PEERSTORE_iterate (peerstore, "fs", peer, "respect",
636 GNUNET_TIME_UNIT_FOREVER_REL, &peer_respect_cb,
642 * It may be time to re-start migrating content to this
643 * peer. Check, and if so, restart migration.
645 * @param cls the `struct GSF_ConnectedPeer`
646 * @param tc scheduler context
649 revive_migration (void *cls,
650 const struct GNUNET_SCHEDULER_TaskContext *tc)
652 struct GSF_ConnectedPeer *cp = cls;
653 struct GNUNET_TIME_Relative bt;
655 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
656 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
657 if (0 != bt.rel_value_us)
659 /* still time left... */
660 cp->mig_revive_task =
661 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
664 GSF_push_start_ (cp);
669 * Get a handle for a connected peer.
671 * @param peer peer's identity
672 * @return NULL if the peer is not currently connected
674 struct GSF_ConnectedPeer *
675 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
679 return GNUNET_CONTAINER_multipeermap_get (cp_map, peer);
684 * Handle P2P "MIGRATION_STOP" message.
686 * @param cls closure, always NULL
687 * @param other the other peer involved (sender or receiver, NULL
688 * for loopback messages where we are both sender and receiver)
689 * @param message the actual message
690 * @return #GNUNET_OK to keep the connection open,
691 * #GNUNET_SYSERR to close it (signal serious error)
694 GSF_handle_p2p_migration_stop_ (void *cls,
695 const struct GNUNET_PeerIdentity *other,
696 const struct GNUNET_MessageHeader *message)
698 struct GSF_ConnectedPeer *cp;
699 const struct MigrationStopMessage *msm;
700 struct GNUNET_TIME_Relative bt;
702 msm = (const struct MigrationStopMessage *) message;
703 cp = GSF_peer_get_ (other);
709 GNUNET_STATISTICS_update (GSF_stats,
710 gettext_noop ("# migration stop messages received"),
712 bt = GNUNET_TIME_relative_ntoh (msm->duration);
713 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
714 _("Migration of content to peer `%s' blocked for %s\n"),
716 GNUNET_STRINGS_relative_time_to_string (bt, GNUNET_YES));
717 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
718 if (GNUNET_SCHEDULER_NO_TASK == cp->mig_revive_task)
721 cp->mig_revive_task =
722 GNUNET_SCHEDULER_add_delayed (bt,
723 &revive_migration, cp);
730 * Copy reply and free put message.
732 * @param cls the `struct PutMessage`
733 * @param buf_size number of bytes available in @a buf
734 * @param buf where to copy the message, NULL on error (peer disconnect)
735 * @return number of bytes copied to @a buf, can be 0 (without indicating an error)
738 copy_reply (void *cls, size_t buf_size, void *buf)
740 struct PutMessage *pm = cls;
745 GNUNET_assert (buf_size >= ntohs (pm->header.size));
746 size = ntohs (pm->header.size);
747 memcpy (buf, pm, size);
748 GNUNET_STATISTICS_update (GSF_stats,
750 ("# replies transmitted to other peers"), 1,
756 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# replies dropped"), 1,
765 * Free resources associated with the given peer request.
767 * @param peerreq request to free
768 * @param query associated key for the request
771 free_pending_request (struct PeerRequest *peerreq,
772 const struct GNUNET_HashCode *query)
774 struct GSF_ConnectedPeer *cp = peerreq->cp;
776 if (GNUNET_SCHEDULER_NO_TASK != peerreq->kill_task)
778 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
779 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
781 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
783 GNUNET_break (GNUNET_YES ==
784 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
786 GNUNET_free (peerreq);
791 * Cancel all requests associated with the peer.
794 * @param query hash code of the request
795 * @param value the `struct GSF_PendingRequest`
796 * @return #GNUNET_YES (continue to iterate)
799 cancel_pending_request (void *cls,
800 const struct GNUNET_HashCode *query,
803 struct PeerRequest *peerreq = value;
804 struct GSF_PendingRequest *pr = peerreq->pr;
805 struct GSF_PendingRequestData *prd;
807 prd = GSF_pending_request_get_data_ (pr);
808 GSF_pending_request_cancel_ (pr, GNUNET_NO);
809 free_pending_request (peerreq, &prd->query);
815 * Free the given request.
817 * @param cls the request to free
818 * @param tc task context
821 peer_request_destroy (void *cls,
822 const struct GNUNET_SCHEDULER_TaskContext *tc)
824 struct PeerRequest *peerreq = cls;
825 struct GSF_PendingRequest *pr = peerreq->pr;
826 struct GSF_PendingRequestData *prd;
828 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
829 prd = GSF_pending_request_get_data_ (pr);
830 cancel_pending_request (NULL, &prd->query, peerreq);
835 * The artificial delay is over, transmit the message now.
837 * @param cls the `struct GSF_DelayedHandle` with the message
838 * @param tc scheduler context
841 transmit_delayed_now (void *cls,
842 const struct GNUNET_SCHEDULER_TaskContext *tc)
844 struct GSF_DelayedHandle *dh = cls;
845 struct GSF_ConnectedPeer *cp = dh->cp;
847 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
848 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
850 GNUNET_free (dh->pm);
854 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT,
855 dh->msize, ©_reply, dh->pm);
861 * Get the randomized delay a response should be subjected to.
863 * @return desired delay
865 static struct GNUNET_TIME_Relative
866 get_randomized_delay ()
868 struct GNUNET_TIME_Relative ret;
871 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
872 GNUNET_CRYPTO_random_u32
873 (GNUNET_CRYPTO_QUALITY_WEAK,
874 2 * GSF_avg_latency.rel_value_us + 1));
875 #if INSANE_STATISTICS
876 GNUNET_STATISTICS_update (GSF_stats,
878 ("# artificial delays introduced (ms)"),
879 ret.rel_value_us / 1000LL, GNUNET_NO);
886 * Handle a reply to a pending request. Also called if a request
887 * expires (then with data == NULL). The handler may be called
888 * many times (depending on the request type), but will not be
889 * called during or after a call to GSF_pending_request_cancel
890 * and will also not be called anymore after a call signalling
893 * @param cls `struct PeerRequest` this is an answer for
894 * @param eval evaluation of the result
895 * @param pr handle to the original pending request
896 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
897 * @param expiration when does @a data expire?
898 * @param last_transmission when did we last transmit a request for this block
899 * @param type type of the block
900 * @param data response data, NULL on request expiration
901 * @param data_len number of bytes in @a data
904 handle_p2p_reply (void *cls,
905 enum GNUNET_BLOCK_EvaluationResult eval,
906 struct GSF_PendingRequest *pr,
907 uint32_t reply_anonymity_level,
908 struct GNUNET_TIME_Absolute expiration,
909 struct GNUNET_TIME_Absolute last_transmission,
910 enum GNUNET_BLOCK_Type type,
914 struct PeerRequest *peerreq = cls;
915 struct GSF_ConnectedPeer *cp = peerreq->cp;
916 struct GSF_PendingRequestData *prd;
917 struct PutMessage *pm;
920 GNUNET_assert (data_len + sizeof (struct PutMessage) <
921 GNUNET_SERVER_MAX_MESSAGE_SIZE);
922 GNUNET_assert (peerreq->pr == pr);
923 prd = GSF_pending_request_get_data_ (pr);
926 free_pending_request (peerreq, &prd->query);
929 GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
930 if ((prd->type != type) && (GNUNET_BLOCK_TYPE_ANY != prd->type))
932 GNUNET_STATISTICS_update (GSF_stats,
934 ("# replies dropped due to type mismatch"),
938 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
939 "Transmitting result for query `%s' to peer\n",
940 GNUNET_h2s (&prd->query));
941 GNUNET_STATISTICS_update (GSF_stats,
942 gettext_noop ("# replies received for other peers"),
944 msize = sizeof (struct PutMessage) + data_len;
945 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
950 if ((UINT32_MAX != reply_anonymity_level) && (reply_anonymity_level > 1))
952 if (reply_anonymity_level - 1 > GSF_cover_content_count)
954 GNUNET_STATISTICS_update (GSF_stats,
956 ("# replies dropped due to insufficient cover traffic"),
960 GSF_cover_content_count -= (reply_anonymity_level - 1);
963 pm = GNUNET_malloc (msize);
964 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
965 pm->header.size = htons (msize);
966 pm->type = htonl (type);
967 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
968 memcpy (&pm[1], data, data_len);
969 if ((UINT32_MAX != reply_anonymity_level) && (0 != reply_anonymity_level) &&
970 (GNUNET_YES == GSF_enable_randomized_delays))
972 struct GSF_DelayedHandle *dh;
974 dh = GNUNET_new (struct GSF_DelayedHandle);
978 GNUNET_CONTAINER_DLL_insert (cp->delayed_head, cp->delayed_tail, dh);
980 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
981 &transmit_delayed_now, dh);
985 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT, msize,
988 if (GNUNET_BLOCK_EVALUATION_OK_LAST != eval)
990 if (GNUNET_SCHEDULER_NO_TASK == peerreq->kill_task)
992 GNUNET_STATISTICS_update (GSF_stats,
994 ("# P2P searches destroyed due to ultimate reply"),
997 GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
1003 * Increase the peer's respect by a value.
1005 * @param cp which peer to change the respect value on
1006 * @param value is the int value by which the
1007 * peer's credit is to be increased or decreased
1008 * @returns the actual change in respect (positive or negative)
1011 change_peer_respect (struct GSF_ConnectedPeer *cp, int value)
1015 GNUNET_assert (NULL != cp);
1018 if (cp->ppd.respect + value < cp->ppd.respect)
1020 value = UINT32_MAX - cp->ppd.respect;
1021 cp->ppd.respect = UINT32_MAX;
1024 cp->ppd.respect += value;
1028 if (cp->ppd.respect < -value)
1030 value = -cp->ppd.respect;
1031 cp->ppd.respect = 0;
1034 cp->ppd.respect += value;
1041 * We've received a request with the specified priority. Bound it
1042 * according to how much we respect the given peer.
1044 * @param prio_in requested priority
1045 * @param cp the peer making the request
1046 * @return effective priority
1049 bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
1051 #define N ((double)128.0)
1056 ld = GSF_test_get_load_too_high_ (0);
1057 if (GNUNET_SYSERR == ld)
1059 #if INSANE_STATISTICS
1060 GNUNET_STATISTICS_update (GSF_stats,
1062 ("# requests done for free (low load)"), 1,
1065 return 0; /* excess resources */
1067 if (prio_in > INT32_MAX)
1068 prio_in = INT32_MAX;
1069 ret = -change_peer_respect (cp, -(int) prio_in);
1072 if (ret > GSF_current_priorities + N)
1073 rret = GSF_current_priorities + N;
1076 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1078 if ((GNUNET_YES == ld) && (ret > 0))
1080 /* try with charging */
1081 ld = GSF_test_get_load_too_high_ (ret);
1083 if (GNUNET_YES == ld)
1085 GNUNET_STATISTICS_update (GSF_stats,
1087 ("# request dropped, priority insufficient"), 1,
1090 change_peer_respect (cp, (int) ret);
1091 return -1; /* not enough resources */
1095 GNUNET_STATISTICS_update (GSF_stats,
1097 ("# requests done for a price (normal load)"), 1,
1106 * The priority level imposes a bound on the maximum
1107 * value for the ttl that can be requested.
1109 * @param ttl_in requested ttl
1110 * @param prio given priority
1111 * @return ttl_in if ttl_in is below the limit,
1112 * otherwise the ttl-limit for the given priority
1115 bound_ttl (int32_t ttl_in, uint32_t prio)
1117 unsigned long long allowed;
1121 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1122 if (ttl_in > allowed)
1124 if (allowed >= (1 << 30))
1133 * Handle P2P "QUERY" message. Creates the pending request entry
1134 * and sets up all of the data structures to that we will
1135 * process replies properly. Does not initiate forwarding or
1136 * local database lookups.
1138 * @param other the other peer involved (sender or receiver, NULL
1139 * for loopback messages where we are both sender and receiver)
1140 * @param message the actual message
1141 * @return pending request handle, NULL on error
1143 struct GSF_PendingRequest *
1144 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1145 const struct GNUNET_MessageHeader *message)
1147 struct PeerRequest *peerreq;
1148 struct GSF_PendingRequest *pr;
1149 struct GSF_PendingRequestData *prd;
1150 struct GSF_ConnectedPeer *cp;
1151 struct GSF_ConnectedPeer *cps;
1152 const struct GNUNET_PeerIdentity *target;
1153 enum GSF_PendingRequestOptions options;
1155 const struct GetMessage *gm;
1157 const struct GNUNET_PeerIdentity *opt;
1160 uint32_t ttl_decrement;
1163 enum GNUNET_BLOCK_Type type;
1164 GNUNET_PEER_Id spid;
1166 GNUNET_assert (other != NULL);
1167 msize = ntohs (message->size);
1168 if (msize < sizeof (struct GetMessage))
1170 GNUNET_break_op (0);
1173 GNUNET_STATISTICS_update (GSF_stats,
1175 ("# GET requests received (from other peers)"), 1,
1177 gm = (const struct GetMessage *) message;
1178 type = ntohl (gm->type);
1179 bm = ntohl (gm->hash_bitmap);
1187 if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_PeerIdentity))
1189 GNUNET_break_op (0);
1192 opt = (const struct GNUNET_PeerIdentity *) &gm[1];
1193 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_PeerIdentity);
1194 /* bfsize must be power of 2, check! */
1195 if (0 != ((bfsize - 1) & bfsize))
1197 GNUNET_break_op (0);
1200 GSF_cover_query_count++;
1201 bm = ntohl (gm->hash_bitmap);
1203 cps = GSF_peer_get_ (other);
1206 /* peer must have just disconnected */
1207 GNUNET_STATISTICS_update (GSF_stats,
1209 ("# requests dropped due to initiator not being connected"),
1213 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1214 cp = GSF_peer_get_ (&opt[bits++]);
1219 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1220 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1221 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
1222 GNUNET_i2s (&opt[bits - 1]));
1225 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1226 "Failed to find peer `%4s' in connection set. Dropping query.\n",
1227 GNUNET_i2s (other));
1228 #if INSANE_STATISTICS
1229 GNUNET_STATISTICS_update (GSF_stats,
1231 ("# requests dropped due to missing reverse route"),
1236 /* note that we can really only check load here since otherwise
1237 * peers could find out that we are overloaded by not being
1238 * disconnected after sending us a malformed query... */
1239 priority = bound_priority (ntohl (gm->priority), cps);
1242 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1243 "Dropping query from `%s', this peer is too busy.\n",
1244 GNUNET_i2s (other));
1247 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1248 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
1249 GNUNET_h2s (&gm->query),
1250 (unsigned int) type,
1255 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? (&opt[bits++]) : NULL;
1256 options = GSF_PRO_DEFAULTS;
1258 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
1259 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1260 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value_us * 2 +
1261 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1263 /* don't have BW to send to peer, or would likely take longer than we have for it,
1264 * so at best indirect the query */
1266 options |= GSF_PRO_FORWARD_ONLY;
1267 spid = GNUNET_PEER_intern (other);
1268 GNUNET_assert (0 != spid);
1270 ttl = bound_ttl (ntohl (gm->ttl), priority);
1271 /* decrement ttl (always) */
1273 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1275 if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
1277 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1278 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1279 GNUNET_i2s (other), ttl, ttl_decrement);
1280 GNUNET_STATISTICS_update (GSF_stats,
1282 ("# requests dropped due TTL underflow"), 1,
1284 /* integer underflow => drop (should be very rare)! */
1287 ttl -= ttl_decrement;
1289 /* test if the request already exists */
1290 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map, &gm->query);
1291 if (peerreq != NULL)
1294 prd = GSF_pending_request_get_data_ (pr);
1295 if (prd->type == type)
1297 if (prd->ttl.abs_value_us >= GNUNET_TIME_absolute_get ().abs_value_us + ttl * 1000LL)
1299 /* existing request has higher TTL, drop new one! */
1300 prd->priority += priority;
1301 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1302 "Have existing request with higher TTL, dropping new request.\n",
1303 GNUNET_i2s (other));
1304 GNUNET_STATISTICS_update (GSF_stats,
1306 ("# requests dropped due to higher-TTL request"),
1310 /* existing request has lower TTL, drop old one! */
1311 priority += prd->priority;
1312 GSF_pending_request_cancel_ (pr, GNUNET_YES);
1313 free_pending_request (peerreq, &gm->query);
1317 peerreq = GNUNET_new (struct PeerRequest);
1319 pr = GSF_pending_request_create_ (options, type, &gm->query,
1322 0) ? (const char *) &opt[bits] : NULL,
1323 bfsize, ntohl (gm->filter_mutator),
1325 (uint32_t) priority, ttl, spid, GNUNET_PEER_intern (other), NULL, 0, /* replies_seen */
1326 &handle_p2p_reply, peerreq);
1327 GNUNET_assert (NULL != pr);
1329 GNUNET_break (GNUNET_OK ==
1330 GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
1332 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1333 GNUNET_STATISTICS_update (GSF_stats,
1335 ("# P2P query messages received and processed"), 1,
1337 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
1344 * Function called if there has been a timeout trying to satisfy
1345 * a transmission request.
1347 * @param cls the `struct GSF_PeerTransmitHandle` of the request
1348 * @param tc scheduler context
1351 peer_transmit_timeout (void *cls,
1352 const struct GNUNET_SCHEDULER_TaskContext *tc)
1354 struct GSF_PeerTransmitHandle *pth = cls;
1355 struct GSF_ConnectedPeer *cp;
1357 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1358 "Timeout trying to transmit to other peer\n");
1359 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1361 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1362 if (GNUNET_YES == pth->is_query)
1363 GNUNET_assert (0 < cp->ppd.pending_queries--);
1364 else if (GNUNET_NO == pth->is_query)
1365 GNUNET_assert (0 < cp->ppd.pending_replies--);
1366 GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
1367 if (NULL != cp->cth)
1369 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1372 pth->gmc (pth->gmc_cls, 0, NULL);
1373 GNUNET_assert (0 == cp->cth_in_progress);
1379 * Transmit a message to the given peer as soon as possible.
1380 * If the peer disconnects before the transmission can happen,
1381 * the callback is invoked with a `NULL` @a buffer.
1383 * @param cp target peer
1384 * @param is_query is this a query (#GNUNET_YES) or content (#GNUNET_NO) or neither (#GNUNET_SYSERR)
1385 * @param priority how important is this request?
1386 * @param timeout when does this request timeout (call gmc with error)
1387 * @param size number of bytes we would like to send to the peer
1388 * @param gmc function to call to get the message
1389 * @param gmc_cls closure for @a gmc
1390 * @return handle to cancel request
1392 struct GSF_PeerTransmitHandle *
1393 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
1396 struct GNUNET_TIME_Relative timeout,
1398 GSF_GetMessageCallback gmc, void *gmc_cls)
1400 struct GSF_PeerTransmitHandle *pth;
1401 struct GSF_PeerTransmitHandle *pos;
1402 struct GSF_PeerTransmitHandle *prev;
1404 pth = GNUNET_new (struct GSF_PeerTransmitHandle);
1405 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1406 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1408 pth->gmc_cls = gmc_cls;
1410 pth->is_query = is_query;
1411 pth->priority = priority;
1413 /* insertion sort (by priority, descending) */
1416 while ((NULL != pos) && (pos->priority > priority))
1421 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head, cp->pth_tail, prev, pth);
1422 if (GNUNET_YES == is_query)
1423 cp->ppd.pending_queries++;
1424 else if (GNUNET_NO == is_query)
1425 cp->ppd.pending_replies++;
1427 GNUNET_SCHEDULER_add_delayed (timeout, &peer_transmit_timeout, pth);
1428 schedule_transmission (pth);
1434 * Cancel an earlier request for transmission.
1436 * @param pth request to cancel
1439 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1441 struct GSF_ConnectedPeer *cp;
1443 if (GNUNET_SCHEDULER_NO_TASK != pth->timeout_task)
1445 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1446 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1449 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1450 if (GNUNET_YES == pth->is_query)
1451 GNUNET_assert (0 < cp->ppd.pending_queries--);
1452 else if (GNUNET_NO == pth->is_query)
1453 GNUNET_assert (0 < cp->ppd.pending_replies--);
1459 * Report on receiving a reply; update the performance record of the given peer.
1461 * @param cp responding peer (will be updated)
1462 * @param request_time time at which the original query was transmitted
1463 * @param request_priority priority of the original request
1466 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1467 struct GNUNET_TIME_Absolute request_time,
1468 uint32_t request_priority)
1470 struct GNUNET_TIME_Relative delay;
1472 delay = GNUNET_TIME_absolute_get_duration (request_time);
1473 cp->ppd.avg_reply_delay.rel_value_us =
1474 (cp->ppd.avg_reply_delay.rel_value_us * (RUNAVG_DELAY_N - 1) +
1475 delay.rel_value_us) / RUNAVG_DELAY_N;
1476 cp->ppd.avg_priority =
1477 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1478 request_priority) / RUNAVG_DELAY_N;
1483 * Report on receiving a reply in response to an initiating client.
1484 * Remember that this peer is good for this client.
1486 * @param cp responding peer (will be updated)
1487 * @param initiator_client local client on responsible for query
1490 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1491 struct GSF_LocalClient *initiator_client)
1493 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1494 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1499 * Report on receiving a reply in response to an initiating peer.
1500 * Remember that this peer is good for this initiating peer.
1502 * @param cp responding peer (will be updated)
1503 * @param initiator_peer other peer responsible for query
1506 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1507 const struct GSF_ConnectedPeer *initiator_peer)
1511 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1512 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1513 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1514 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1515 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1520 * Write peer-respect information to a file - flush the buffer entry!
1523 * @param key peer identity
1524 * @param value the `struct GSF_ConnectedPeer` to flush
1525 * @return #GNUNET_OK to continue iteration
1528 flush_respect (void *cls,
1529 const struct GNUNET_PeerIdentity *key,
1532 struct GSF_ConnectedPeer *cp = value;
1533 struct GNUNET_PeerIdentity pid;
1535 if (cp->ppd.respect == cp->disk_respect)
1536 return GNUNET_OK; /* unchanged */
1537 GNUNET_assert (0 != cp->ppd.pid);
1538 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1539 GNUNET_PEERSTORE_store (peerstore, "fs", &pid, "respect", &cp->ppd.respect,
1540 sizeof (cp->ppd.respect),
1541 GNUNET_TIME_UNIT_FOREVER_ABS,
1542 GNUNET_PEERSTORE_STOREOPTION_REPLACE, NULL, NULL);
1548 * A peer disconnected from us. Tear down the connected peer
1552 * @param peer identity of peer that connected
1555 GSF_peer_disconnect_handler_ (void *cls,
1556 const struct GNUNET_PeerIdentity *peer)
1558 struct GSF_ConnectedPeer *cp;
1559 struct GSF_PeerTransmitHandle *pth;
1560 struct GSF_DelayedHandle *dh;
1562 cp = GSF_peer_get_ (peer);
1564 return; /* must have been disconnect from core with
1565 * 'peer' == my_id, ignore */
1566 flush_respect (NULL, peer, cp);
1567 GNUNET_assert (GNUNET_YES ==
1568 GNUNET_CONTAINER_multipeermap_remove (cp_map,
1571 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
1572 GNUNET_CONTAINER_multipeermap_size (cp_map),
1574 if (NULL != cp->respect_iterate_req)
1576 GNUNET_PEERSTORE_iterate_cancel (cp->respect_iterate_req);
1577 cp->respect_iterate_req = NULL;
1579 if (NULL != cp->migration_pth)
1581 GSF_peer_transmit_cancel_ (cp->migration_pth);
1582 cp->migration_pth = NULL;
1586 GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
1589 if (GNUNET_SCHEDULER_NO_TASK != cp->rc_delay_task)
1591 GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
1592 cp->rc_delay_task = GNUNET_SCHEDULER_NO_TASK;
1594 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1595 &cancel_pending_request, cp);
1596 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1597 cp->request_map = NULL;
1598 GSF_plan_notify_peer_disconnect_ (cp);
1599 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1600 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1601 memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
1602 GSF_push_stop_ (cp);
1603 if (NULL != cp->cth)
1605 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1608 GNUNET_assert (0 == cp->cth_in_progress);
1609 while (NULL != (pth = cp->pth_head))
1611 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1613 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1614 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1616 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1617 pth->gmc (pth->gmc_cls, 0, NULL);
1620 while (NULL != (dh = cp->delayed_head))
1622 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
1623 GNUNET_SCHEDULER_cancel (dh->delay_task);
1624 GNUNET_free (dh->pm);
1627 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1628 if (GNUNET_SCHEDULER_NO_TASK != cp->mig_revive_task)
1630 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1631 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
1638 * Closure for #call_iterator().
1640 struct IterationContext
1643 * Function to call on each entry.
1645 GSF_ConnectedPeerIterator it;
1648 * Closure for @e it.
1655 * Function that calls the callback for each peer.
1657 * @param cls the `struct IterationContext *`
1658 * @param key identity of the peer
1659 * @param value the `struct GSF_ConnectedPeer *`
1660 * @return #GNUNET_YES to continue iteration
1663 call_iterator (void *cls,
1664 const struct GNUNET_PeerIdentity *key,
1667 struct IterationContext *ic = cls;
1668 struct GSF_ConnectedPeer *cp = value;
1678 * Iterate over all connected peers.
1680 * @param it function to call for each peer
1681 * @param it_cls closure for @a it
1684 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it,
1687 struct IterationContext ic;
1691 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1698 * Obtain the identity of a connected peer.
1700 * @param cp peer to get identity of
1701 * @param id identity to set (written to)
1704 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1705 struct GNUNET_PeerIdentity *id)
1707 GNUNET_assert (0 != cp->ppd.pid);
1708 GNUNET_PEER_resolve (cp->ppd.pid, id);
1713 * Obtain the identity of a connected peer.
1715 * @param cp peer to get identity of
1716 * @return reference to peer identity, valid until peer disconnects (!)
1718 const struct GNUNET_PeerIdentity *
1719 GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp)
1721 GNUNET_assert (0 != cp->ppd.pid);
1722 return GNUNET_PEER_resolve2 (cp->ppd.pid);
1727 * Assemble a migration stop message for transmission.
1729 * @param cls the `struct GSF_ConnectedPeer` to use
1730 * @param size number of bytes we're allowed to write to @a buf
1731 * @param buf where to copy the message
1732 * @return number of bytes copied to @a buf
1735 create_migration_stop_message (void *cls,
1739 struct GSF_ConnectedPeer *cp = cls;
1740 struct MigrationStopMessage msm;
1742 cp->migration_pth = NULL;
1745 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1746 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1747 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1748 msm.reserved = htonl (0);
1750 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1751 (cp->last_migration_block));
1752 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1753 GNUNET_STATISTICS_update (GSF_stats,
1754 gettext_noop ("# migration stop messages sent"),
1756 return sizeof (struct MigrationStopMessage);
1761 * Ask a peer to stop migrating data to us until the given point
1764 * @param cp peer to ask
1765 * @param block_time until when to block
1768 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1769 struct GNUNET_TIME_Absolute block_time)
1771 if (cp->last_migration_block.abs_value_us > block_time.abs_value_us)
1773 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1774 "Migration already blocked for another %s\n",
1775 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining
1776 (cp->last_migration_block), GNUNET_YES));
1777 return; /* already blocked */
1779 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %s\n",
1780 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (block_time),
1782 cp->last_migration_block = block_time;
1783 if (NULL != cp->migration_pth)
1784 GSF_peer_transmit_cancel_ (cp->migration_pth);
1786 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1787 GNUNET_TIME_UNIT_FOREVER_REL,
1788 sizeof (struct MigrationStopMessage),
1789 &create_migration_stop_message, cp);
1794 * Notify core about a preference we have for the given peer
1795 * (to allocate more resources towards it). The change will
1796 * be communicated the next time we reserve bandwidth with
1797 * core (not instantly).
1799 * @param cp peer to reserve bandwidth from
1800 * @param pref preference change
1803 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1806 cp->inc_preference += pref;
1811 * Call this method periodically to flush respect information to disk.
1813 * @param cls closure, not used
1814 * @param tc task context, not used
1817 cron_flush_respect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1822 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &flush_respect, NULL);
1825 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1827 GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
1828 GNUNET_SCHEDULER_PRIORITY_HIGH,
1829 &cron_flush_respect, NULL);
1834 * Initialize peer management subsystem.
1837 GSF_connected_peer_init_ ()
1839 cp_map = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
1840 peerstore = GNUNET_PEERSTORE_connect (GSF_cfg);
1841 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1842 &cron_flush_respect, NULL);
1847 * Iterator to free peer entries.
1849 * @param cls closure, unused
1850 * @param key current key code
1851 * @param value value in the hash map (peer entry)
1852 * @return #GNUNET_YES (we should continue to iterate)
1855 clean_peer (void *cls,
1856 const struct GNUNET_PeerIdentity *key,
1859 GSF_peer_disconnect_handler_ (NULL, key);
1865 * Shutdown peer management subsystem.
1868 GSF_connected_peer_done_ ()
1870 cron_flush_respect (NULL, NULL);
1871 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_peer, NULL);
1872 GNUNET_CONTAINER_multipeermap_destroy (cp_map);
1874 GNUNET_PEERSTORE_disconnect (peerstore, GNUNET_YES);
1879 * Iterator to remove references to LC entry.
1881 * @param cls the `struct GSF_LocalClient *` to look for
1882 * @param key current key code
1883 * @param value value in the hash map (peer entry)
1884 * @return #GNUNET_YES (we should continue to iterate)
1887 clean_local_client (void *cls,
1888 const struct GNUNET_PeerIdentity *key,
1891 const struct GSF_LocalClient *lc = cls;
1892 struct GSF_ConnectedPeer *cp = value;
1895 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
1896 if (cp->ppd.last_client_replies[i] == lc)
1897 cp->ppd.last_client_replies[i] = NULL;
1903 * Notification that a local client disconnected. Clean up all of our
1904 * references to the given handle.
1906 * @param lc handle to the local client (henceforth invalid)
1909 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
1912 return; /* already cleaned up */
1913 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_local_client,
1918 /* end of gnunet-service-fs_cp.c */