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;
320 * Map from peer identities to 'struct GSF_ConnectPeer' entries.
322 static struct GNUNET_CONTAINER_MultiPeerMap *cp_map;
325 * Handle to peerstore service.
327 static struct GNUNET_PEERSTORE_Handle *peerstore;
331 * Update the latency information kept for the given peer.
333 * @param id peer record to update
334 * @param latency current latency value
337 GSF_update_peer_latency_ (const struct GNUNET_PeerIdentity *id,
338 struct GNUNET_TIME_Relative latency)
340 struct GSF_ConnectedPeer *cp;
342 cp = GSF_peer_get_ (id);
344 return; /* we're not yet connected at the core level, ignore */
345 GNUNET_LOAD_value_set_decline (cp->ppd.transmission_delay, latency);
346 /* LATER: merge atsi into cp's performance data (if we ever care...) */
351 * Return the performance data record for the given peer
353 * @param cp peer to query
354 * @return performance data record for the peer
356 struct GSF_PeerPerformanceData *
357 GSF_get_peer_performance_data_ (struct GSF_ConnectedPeer *cp)
364 * Core is ready to transmit to a peer, get the message.
366 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
367 * @param size number of bytes core is willing to take
368 * @param buf where to copy the message
369 * @return number of bytes copied to buf
372 peer_transmit_ready_cb (void *cls, size_t size, void *buf);
376 * Function called by core upon success or failure of our bandwidth reservation request.
378 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
379 * @param peer identifies the peer
380 * @param amount set to the amount that was actually reserved or unreserved;
381 * either the full requested amount or zero (no partial reservations)
382 * @param res_delay if the reservation could not be satisfied (amount was 0), how
383 * long should the client wait until re-trying?
386 ats_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
387 int32_t amount, struct GNUNET_TIME_Relative res_delay);
391 * If ready (bandwidth reserved), try to schedule transmission via
392 * core for the given handle.
394 * @param pth transmission handle to schedule
397 schedule_transmission (struct GSF_PeerTransmitHandle *pth)
399 struct GSF_ConnectedPeer *cp;
400 struct GNUNET_PeerIdentity target;
403 if ((NULL != cp->cth) || (0 != cp->cth_in_progress))
404 return; /* already done */
405 GNUNET_assert (0 != cp->ppd.pid);
406 GNUNET_PEER_resolve (cp->ppd.pid, &target);
408 if (0 != cp->inc_preference)
410 GNUNET_ATS_performance_change_preference (GSF_ats, &target, GNUNET_ATS_PREFERENCE_BANDWIDTH,
411 (double) cp->inc_preference,
412 GNUNET_ATS_PREFERENCE_END);
413 cp->inc_preference = 0;
416 if ((GNUNET_YES == pth->is_query) && (GNUNET_YES != pth->was_reserved))
418 /* query, need reservation */
419 if (GNUNET_YES != cp->did_reserve)
420 return; /* not ready */
421 cp->did_reserve = GNUNET_NO;
422 /* reservation already done! */
423 pth->was_reserved = GNUNET_YES;
425 GNUNET_ATS_reserve_bandwidth (GSF_ats, &target, DBLOCK_SIZE,
426 &ats_reserve_callback, cp);
429 GNUNET_assert (NULL == cp->cth);
430 cp->cth_in_progress++;
432 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES,
433 GNUNET_CORE_PRIO_BACKGROUND,
434 GNUNET_TIME_absolute_get_remaining
435 (pth->timeout), &target, pth->size,
436 &peer_transmit_ready_cb, cp);
437 GNUNET_assert (NULL != cp->cth);
438 GNUNET_assert (0 < cp->cth_in_progress--);
443 * Core is ready to transmit to a peer, get the message.
445 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
446 * @param size number of bytes core is willing to take
447 * @param buf where to copy the message
448 * @return number of bytes copied to buf
451 peer_transmit_ready_cb (void *cls, size_t size, void *buf)
453 struct GSF_ConnectedPeer *cp = cls;
454 struct GSF_PeerTransmitHandle *pth = cp->pth_head;
455 struct GSF_PeerTransmitHandle *pos;
461 if (pth->size > size)
463 schedule_transmission (pth);
466 if (GNUNET_SCHEDULER_NO_TASK != pth->timeout_task)
468 GNUNET_SCHEDULER_cancel (pth->timeout_task);
469 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
471 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
472 if (GNUNET_YES == pth->is_query)
474 cp->ppd.last_request_times[(cp->last_request_times_off++) %
475 MAX_QUEUE_PER_PEER] =
476 GNUNET_TIME_absolute_get ();
477 GNUNET_assert (0 < cp->ppd.pending_queries--);
479 else if (GNUNET_NO == pth->is_query)
481 GNUNET_assert (0 < cp->ppd.pending_replies--);
483 GNUNET_LOAD_update (cp->ppd.transmission_delay,
484 GNUNET_TIME_absolute_get_duration
485 (pth->transmission_request_start_time).rel_value_us);
486 ret = pth->gmc (pth->gmc_cls, size, buf);
487 if (NULL != (pos = cp->pth_head))
489 GNUNET_assert (pos != pth);
490 schedule_transmission (pos);
498 * (re)try to reserve bandwidth from the given peer.
500 * @param cls the 'struct GSF_ConnectedPeer' to reserve from
501 * @param tc scheduler context
504 retry_reservation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
506 struct GSF_ConnectedPeer *cp = cls;
507 struct GNUNET_PeerIdentity target;
509 GNUNET_PEER_resolve (cp->ppd.pid, &target);
510 cp->rc_delay_task = GNUNET_SCHEDULER_NO_TASK;
512 GNUNET_ATS_reserve_bandwidth (GSF_ats, &target, DBLOCK_SIZE,
513 &ats_reserve_callback, cp);
518 * Function called by core upon success or failure of our bandwidth reservation request.
520 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
521 * @param peer identifies the peer
522 * @param amount set to the amount that was actually reserved or unreserved;
523 * either the full requested amount or zero (no partial reservations)
524 * @param res_delay if the reservation could not be satisfied (amount was 0), how
525 * long should the client wait until re-trying?
528 ats_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
529 int32_t amount, struct GNUNET_TIME_Relative res_delay)
531 struct GSF_ConnectedPeer *cp = cls;
532 struct GSF_PeerTransmitHandle *pth;
534 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
535 "Reserved %d bytes / need to wait %s for reservation\n",
537 GNUNET_STRINGS_relative_time_to_string (res_delay, GNUNET_YES));
542 GNUNET_SCHEDULER_add_delayed (res_delay, &retry_reservation, cp);
545 cp->did_reserve = GNUNET_YES;
547 if ((NULL != pth) && (NULL == cp->cth) && (0 == cp->cth_in_progress))
549 /* reservation success, try transmission now! */
550 cp->cth_in_progress++;
552 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES,
553 GNUNET_CORE_PRIO_BACKGROUND,
554 GNUNET_TIME_absolute_get_remaining
555 (pth->timeout), peer, pth->size,
556 &peer_transmit_ready_cb, cp);
557 GNUNET_assert (NULL != cp->cth);
558 GNUNET_assert (0 < cp->cth_in_progress--);
563 * Function called by PEERSTORE with peer respect record
565 * @param cls handle to connected peer entry
566 * @param record peerstore record information
567 * @param emsg error message, or NULL if no errors
568 * @return #GNUNET_NO to stop iterating since we only expect 0 or 1 records
571 peer_respect_cb (void *cls, struct GNUNET_PEERSTORE_Record *record, char *emsg)
573 struct GSF_ConnectedPeer *cp = cls;
575 if ((NULL != record) && (sizeof (cp->disk_respect) == record->value_size))
576 cp->disk_respect = cp->ppd.respect = *((uint32_t *)record->value);
577 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128, GNUNET_NO);
578 GNUNET_break (GNUNET_OK ==
579 GNUNET_CONTAINER_multipeermap_put (cp_map,
580 GSF_connected_peer_get_identity2_ (cp),
582 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
583 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
584 GNUNET_CONTAINER_multipeermap_size (cp_map),
586 GSF_push_start_ (cp);
587 if (NULL != cp->creation_cb)
588 cp->creation_cb (cp->creation_cb_cls, cp);
593 * A peer connected to us. Setup the connected peer
596 * @param peer identity of peer that connected
597 * @param creation_cb callback function when the record is created.
598 * @param creation_cb_cls closure for @creation_cb
601 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
602 GSF_ConnectedPeerCreationCallback creation_cb,
603 void *creation_cb_cls)
605 struct GSF_ConnectedPeer *cp;
607 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connected to peer %s\n",
609 cp = GNUNET_new (struct GSF_ConnectedPeer);
610 cp->ppd.pid = GNUNET_PEER_intern (peer);
611 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
613 GNUNET_ATS_reserve_bandwidth (GSF_ats, peer, DBLOCK_SIZE,
614 &ats_reserve_callback, cp);
615 cp->creation_cb = creation_cb;
616 cp->creation_cb_cls = creation_cb_cls;
617 GNUNET_PEERSTORE_iterate (peerstore, "fs", peer, "respect",
618 GNUNET_TIME_UNIT_FOREVER_REL, &peer_respect_cb, cp);
623 * It may be time to re-start migrating content to this
624 * peer. Check, and if so, restart migration.
626 * @param cls the 'struct GSF_ConnectedPeer'
627 * @param tc scheduler context
630 revive_migration (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
632 struct GSF_ConnectedPeer *cp = cls;
633 struct GNUNET_TIME_Relative bt;
635 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
636 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
637 if (0 != bt.rel_value_us)
639 /* still time left... */
640 cp->mig_revive_task =
641 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
644 GSF_push_start_ (cp);
649 * Get a handle for a connected peer.
651 * @param peer peer's identity
652 * @return NULL if the peer is not currently connected
654 struct GSF_ConnectedPeer *
655 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
659 return GNUNET_CONTAINER_multipeermap_get (cp_map, peer);
664 * Handle P2P "MIGRATION_STOP" message.
666 * @param cls closure, always NULL
667 * @param other the other peer involved (sender or receiver, NULL
668 * for loopback messages where we are both sender and receiver)
669 * @param message the actual message
670 * @return GNUNET_OK to keep the connection open,
671 * GNUNET_SYSERR to close it (signal serious error)
674 GSF_handle_p2p_migration_stop_ (void *cls,
675 const struct GNUNET_PeerIdentity *other,
676 const struct GNUNET_MessageHeader *message)
678 struct GSF_ConnectedPeer *cp;
679 const struct MigrationStopMessage *msm;
680 struct GNUNET_TIME_Relative bt;
682 msm = (const struct MigrationStopMessage *) message;
683 cp = GSF_peer_get_ (other);
689 GNUNET_STATISTICS_update (GSF_stats,
690 gettext_noop ("# migration stop messages received"),
692 bt = GNUNET_TIME_relative_ntoh (msm->duration);
693 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
694 _("Migration of content to peer `%s' blocked for %s\n"),
696 GNUNET_STRINGS_relative_time_to_string (bt, GNUNET_YES));
697 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
698 if (GNUNET_SCHEDULER_NO_TASK == cp->mig_revive_task)
701 cp->mig_revive_task =
702 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
709 * Copy reply and free put message.
711 * @param cls the 'struct PutMessage'
712 * @param buf_size number of bytes available in buf
713 * @param buf where to copy the message, NULL on error (peer disconnect)
714 * @return number of bytes copied to 'buf', can be 0 (without indicating an error)
717 copy_reply (void *cls, size_t buf_size, void *buf)
719 struct PutMessage *pm = cls;
724 GNUNET_assert (buf_size >= ntohs (pm->header.size));
725 size = ntohs (pm->header.size);
726 memcpy (buf, pm, size);
727 GNUNET_STATISTICS_update (GSF_stats,
729 ("# replies transmitted to other peers"), 1,
735 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# replies dropped"), 1,
744 * Free resources associated with the given peer request.
746 * @param peerreq request to free
747 * @param query associated key for the request
750 free_pending_request (struct PeerRequest *peerreq,
751 const struct GNUNET_HashCode *query)
753 struct GSF_ConnectedPeer *cp = peerreq->cp;
755 if (GNUNET_SCHEDULER_NO_TASK != peerreq->kill_task)
757 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
758 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
760 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
762 GNUNET_break (GNUNET_YES ==
763 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
765 GNUNET_free (peerreq);
770 * Cancel all requests associated with the peer.
773 * @param query hash code of the request
774 * @param value the 'struct GSF_PendingRequest'
775 * @return GNUNET_YES (continue to iterate)
778 cancel_pending_request (void *cls, const struct GNUNET_HashCode * query, void *value)
780 struct PeerRequest *peerreq = value;
781 struct GSF_PendingRequest *pr = peerreq->pr;
782 struct GSF_PendingRequestData *prd;
784 prd = GSF_pending_request_get_data_ (pr);
785 GSF_pending_request_cancel_ (pr, GNUNET_NO);
786 free_pending_request (peerreq, &prd->query);
792 * Free the given request.
794 * @param cls the request to free
795 * @param tc task context
798 peer_request_destroy (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
800 struct PeerRequest *peerreq = cls;
801 struct GSF_PendingRequest *pr = peerreq->pr;
802 struct GSF_PendingRequestData *prd;
804 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
805 prd = GSF_pending_request_get_data_ (pr);
806 cancel_pending_request (NULL, &prd->query, peerreq);
811 * The artificial delay is over, transmit the message now.
813 * @param cls the 'struct GSF_DelayedHandle' with the message
814 * @param tc scheduler context
817 transmit_delayed_now (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
819 struct GSF_DelayedHandle *dh = cls;
820 struct GSF_ConnectedPeer *cp = dh->cp;
822 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
823 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
825 GNUNET_free (dh->pm);
829 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT,
830 dh->msize, ©_reply, dh->pm);
836 * Get the randomized delay a response should be subjected to.
838 * @return desired delay
840 static struct GNUNET_TIME_Relative
841 get_randomized_delay ()
843 struct GNUNET_TIME_Relative ret;
846 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
847 GNUNET_CRYPTO_random_u32
848 (GNUNET_CRYPTO_QUALITY_WEAK,
849 2 * GSF_avg_latency.rel_value_us + 1));
850 #if INSANE_STATISTICS
851 GNUNET_STATISTICS_update (GSF_stats,
853 ("# artificial delays introduced (ms)"),
854 ret.rel_value_us / 1000LL, GNUNET_NO);
861 * Handle a reply to a pending request. Also called if a request
862 * expires (then with data == NULL). The handler may be called
863 * many times (depending on the request type), but will not be
864 * called during or after a call to GSF_pending_request_cancel
865 * and will also not be called anymore after a call signalling
868 * @param cls 'struct PeerRequest' this is an answer for
869 * @param eval evaluation of the result
870 * @param pr handle to the original pending request
871 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
872 * @param expiration when does 'data' expire?
873 * @param last_transmission when did we last transmit a request for this block
874 * @param type type of the block
875 * @param data response data, NULL on request expiration
876 * @param data_len number of bytes in data
879 handle_p2p_reply (void *cls, enum GNUNET_BLOCK_EvaluationResult eval,
880 struct GSF_PendingRequest *pr, uint32_t reply_anonymity_level,
881 struct GNUNET_TIME_Absolute expiration,
882 struct GNUNET_TIME_Absolute last_transmission,
883 enum GNUNET_BLOCK_Type type, const void *data,
886 struct PeerRequest *peerreq = cls;
887 struct GSF_ConnectedPeer *cp = peerreq->cp;
888 struct GSF_PendingRequestData *prd;
889 struct PutMessage *pm;
892 GNUNET_assert (data_len + sizeof (struct PutMessage) <
893 GNUNET_SERVER_MAX_MESSAGE_SIZE);
894 GNUNET_assert (peerreq->pr == pr);
895 prd = GSF_pending_request_get_data_ (pr);
898 free_pending_request (peerreq, &prd->query);
901 GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
902 if ((prd->type != type) && (GNUNET_BLOCK_TYPE_ANY != prd->type))
904 GNUNET_STATISTICS_update (GSF_stats,
906 ("# replies dropped due to type mismatch"),
910 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
911 "Transmitting result for query `%s' to peer\n",
912 GNUNET_h2s (&prd->query));
913 GNUNET_STATISTICS_update (GSF_stats,
914 gettext_noop ("# replies received for other peers"),
916 msize = sizeof (struct PutMessage) + data_len;
917 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
922 if ((UINT32_MAX != reply_anonymity_level) && (reply_anonymity_level > 1))
924 if (reply_anonymity_level - 1 > GSF_cover_content_count)
926 GNUNET_STATISTICS_update (GSF_stats,
928 ("# replies dropped due to insufficient cover traffic"),
932 GSF_cover_content_count -= (reply_anonymity_level - 1);
935 pm = GNUNET_malloc (msize);
936 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
937 pm->header.size = htons (msize);
938 pm->type = htonl (type);
939 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
940 memcpy (&pm[1], data, data_len);
941 if ((UINT32_MAX != reply_anonymity_level) && (0 != reply_anonymity_level) &&
942 (GNUNET_YES == GSF_enable_randomized_delays))
944 struct GSF_DelayedHandle *dh;
946 dh = GNUNET_new (struct GSF_DelayedHandle);
950 GNUNET_CONTAINER_DLL_insert (cp->delayed_head, cp->delayed_tail, dh);
952 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
953 &transmit_delayed_now, dh);
957 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT, msize,
960 if (GNUNET_BLOCK_EVALUATION_OK_LAST != eval)
962 if (GNUNET_SCHEDULER_NO_TASK == peerreq->kill_task)
964 GNUNET_STATISTICS_update (GSF_stats,
966 ("# P2P searches destroyed due to ultimate reply"),
969 GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
975 * Increase the peer's respect by a value.
977 * @param cp which peer to change the respect value on
978 * @param value is the int value by which the
979 * peer's credit is to be increased or decreased
980 * @returns the actual change in respect (positive or negative)
983 change_peer_respect (struct GSF_ConnectedPeer *cp, int value)
987 GNUNET_assert (NULL != cp);
990 if (cp->ppd.respect + value < cp->ppd.respect)
992 value = UINT32_MAX - cp->ppd.respect;
993 cp->ppd.respect = UINT32_MAX;
996 cp->ppd.respect += value;
1000 if (cp->ppd.respect < -value)
1002 value = -cp->ppd.respect;
1003 cp->ppd.respect = 0;
1006 cp->ppd.respect += value;
1013 * We've received a request with the specified priority. Bound it
1014 * according to how much we respect the given peer.
1016 * @param prio_in requested priority
1017 * @param cp the peer making the request
1018 * @return effective priority
1021 bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
1023 #define N ((double)128.0)
1028 ld = GSF_test_get_load_too_high_ (0);
1029 if (GNUNET_SYSERR == ld)
1031 #if INSANE_STATISTICS
1032 GNUNET_STATISTICS_update (GSF_stats,
1034 ("# requests done for free (low load)"), 1,
1037 return 0; /* excess resources */
1039 if (prio_in > INT32_MAX)
1040 prio_in = INT32_MAX;
1041 ret = -change_peer_respect (cp, -(int) prio_in);
1044 if (ret > GSF_current_priorities + N)
1045 rret = GSF_current_priorities + N;
1048 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1050 if ((GNUNET_YES == ld) && (ret > 0))
1052 /* try with charging */
1053 ld = GSF_test_get_load_too_high_ (ret);
1055 if (GNUNET_YES == ld)
1057 GNUNET_STATISTICS_update (GSF_stats,
1059 ("# request dropped, priority insufficient"), 1,
1062 change_peer_respect (cp, (int) ret);
1063 return -1; /* not enough resources */
1067 GNUNET_STATISTICS_update (GSF_stats,
1069 ("# requests done for a price (normal load)"), 1,
1078 * The priority level imposes a bound on the maximum
1079 * value for the ttl that can be requested.
1081 * @param ttl_in requested ttl
1082 * @param prio given priority
1083 * @return ttl_in if ttl_in is below the limit,
1084 * otherwise the ttl-limit for the given priority
1087 bound_ttl (int32_t ttl_in, uint32_t prio)
1089 unsigned long long allowed;
1093 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1094 if (ttl_in > allowed)
1096 if (allowed >= (1 << 30))
1105 * Handle P2P "QUERY" message. Creates the pending request entry
1106 * and sets up all of the data structures to that we will
1107 * process replies properly. Does not initiate forwarding or
1108 * local database lookups.
1110 * @param other the other peer involved (sender or receiver, NULL
1111 * for loopback messages where we are both sender and receiver)
1112 * @param message the actual message
1113 * @return pending request handle, NULL on error
1115 struct GSF_PendingRequest *
1116 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1117 const struct GNUNET_MessageHeader *message)
1119 struct PeerRequest *peerreq;
1120 struct GSF_PendingRequest *pr;
1121 struct GSF_PendingRequestData *prd;
1122 struct GSF_ConnectedPeer *cp;
1123 struct GSF_ConnectedPeer *cps;
1124 const struct GNUNET_PeerIdentity *target;
1125 enum GSF_PendingRequestOptions options;
1127 const struct GetMessage *gm;
1129 const struct GNUNET_PeerIdentity *opt;
1132 uint32_t ttl_decrement;
1135 enum GNUNET_BLOCK_Type type;
1136 GNUNET_PEER_Id spid;
1138 GNUNET_assert (other != NULL);
1139 msize = ntohs (message->size);
1140 if (msize < sizeof (struct GetMessage))
1142 GNUNET_break_op (0);
1145 GNUNET_STATISTICS_update (GSF_stats,
1147 ("# GET requests received (from other peers)"), 1,
1149 gm = (const struct GetMessage *) message;
1150 type = ntohl (gm->type);
1151 bm = ntohl (gm->hash_bitmap);
1159 if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_PeerIdentity))
1161 GNUNET_break_op (0);
1164 opt = (const struct GNUNET_PeerIdentity *) &gm[1];
1165 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_PeerIdentity);
1166 /* bfsize must be power of 2, check! */
1167 if (0 != ((bfsize - 1) & bfsize))
1169 GNUNET_break_op (0);
1172 GSF_cover_query_count++;
1173 bm = ntohl (gm->hash_bitmap);
1175 cps = GSF_peer_get_ (other);
1178 /* peer must have just disconnected */
1179 GNUNET_STATISTICS_update (GSF_stats,
1181 ("# requests dropped due to initiator not being connected"),
1185 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1186 cp = GSF_peer_get_ (&opt[bits++]);
1191 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1192 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1193 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
1194 GNUNET_i2s (&opt[bits - 1]));
1197 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1198 "Failed to find peer `%4s' in connection set. Dropping query.\n",
1199 GNUNET_i2s (other));
1200 #if INSANE_STATISTICS
1201 GNUNET_STATISTICS_update (GSF_stats,
1203 ("# requests dropped due to missing reverse route"),
1208 /* note that we can really only check load here since otherwise
1209 * peers could find out that we are overloaded by not being
1210 * disconnected after sending us a malformed query... */
1211 priority = bound_priority (ntohl (gm->priority), cps);
1214 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1215 "Dropping query from `%s', this peer is too busy.\n",
1216 GNUNET_i2s (other));
1219 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1220 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
1221 GNUNET_h2s (&gm->query),
1222 (unsigned int) type,
1227 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? (&opt[bits++]) : NULL;
1228 options = GSF_PRO_DEFAULTS;
1230 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
1231 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1232 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value_us * 2 +
1233 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1235 /* don't have BW to send to peer, or would likely take longer than we have for it,
1236 * so at best indirect the query */
1238 options |= GSF_PRO_FORWARD_ONLY;
1239 spid = GNUNET_PEER_intern (other);
1240 GNUNET_assert (0 != spid);
1242 ttl = bound_ttl (ntohl (gm->ttl), priority);
1243 /* decrement ttl (always) */
1245 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1247 if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
1249 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1250 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1251 GNUNET_i2s (other), ttl, ttl_decrement);
1252 GNUNET_STATISTICS_update (GSF_stats,
1254 ("# requests dropped due TTL underflow"), 1,
1256 /* integer underflow => drop (should be very rare)! */
1259 ttl -= ttl_decrement;
1261 /* test if the request already exists */
1262 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map, &gm->query);
1263 if (peerreq != NULL)
1266 prd = GSF_pending_request_get_data_ (pr);
1267 if (prd->type == type)
1269 if (prd->ttl.abs_value_us >= GNUNET_TIME_absolute_get ().abs_value_us + ttl * 1000LL)
1271 /* existing request has higher TTL, drop new one! */
1272 prd->priority += priority;
1273 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1274 "Have existing request with higher TTL, dropping new request.\n",
1275 GNUNET_i2s (other));
1276 GNUNET_STATISTICS_update (GSF_stats,
1278 ("# requests dropped due to higher-TTL request"),
1282 /* existing request has lower TTL, drop old one! */
1283 priority += prd->priority;
1284 GSF_pending_request_cancel_ (pr, GNUNET_YES);
1285 free_pending_request (peerreq, &gm->query);
1289 peerreq = GNUNET_new (struct PeerRequest);
1291 pr = GSF_pending_request_create_ (options, type, &gm->query,
1294 0) ? (const char *) &opt[bits] : NULL,
1295 bfsize, ntohl (gm->filter_mutator),
1297 (uint32_t) priority, ttl, spid, GNUNET_PEER_intern (other), NULL, 0, /* replies_seen */
1298 &handle_p2p_reply, peerreq);
1299 GNUNET_assert (NULL != pr);
1301 GNUNET_break (GNUNET_OK ==
1302 GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
1304 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1305 GNUNET_STATISTICS_update (GSF_stats,
1307 ("# P2P query messages received and processed"), 1,
1309 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
1316 * Function called if there has been a timeout trying to satisfy
1317 * a transmission request.
1319 * @param cls the 'struct GSF_PeerTransmitHandle' of the request
1320 * @param tc scheduler context
1323 peer_transmit_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1325 struct GSF_PeerTransmitHandle *pth = cls;
1326 struct GSF_ConnectedPeer *cp;
1328 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1329 "Timeout trying to transmit to other peer\n");
1330 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1332 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1333 if (GNUNET_YES == pth->is_query)
1334 GNUNET_assert (0 < cp->ppd.pending_queries--);
1335 else if (GNUNET_NO == pth->is_query)
1336 GNUNET_assert (0 < cp->ppd.pending_replies--);
1337 GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
1338 if (NULL != cp->cth)
1340 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1343 pth->gmc (pth->gmc_cls, 0, NULL);
1344 GNUNET_assert (0 == cp->cth_in_progress);
1350 * Transmit a message to the given peer as soon as possible.
1351 * If the peer disconnects before the transmission can happen,
1352 * the callback is invoked with a `NULL` @a buffer.
1354 * @param cp target peer
1355 * @param is_query is this a query (#GNUNET_YES) or content (#GNUNET_NO) or neither (#GNUNET_SYSERR)
1356 * @param priority how important is this request?
1357 * @param timeout when does this request timeout (call gmc with error)
1358 * @param size number of bytes we would like to send to the peer
1359 * @param gmc function to call to get the message
1360 * @param gmc_cls closure for @a gmc
1361 * @return handle to cancel request
1363 struct GSF_PeerTransmitHandle *
1364 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp, int is_query,
1365 uint32_t priority, struct GNUNET_TIME_Relative timeout,
1366 size_t size, GSF_GetMessageCallback gmc, void *gmc_cls)
1368 struct GSF_PeerTransmitHandle *pth;
1369 struct GSF_PeerTransmitHandle *pos;
1370 struct GSF_PeerTransmitHandle *prev;
1372 pth = GNUNET_new (struct GSF_PeerTransmitHandle);
1373 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1374 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1376 pth->gmc_cls = gmc_cls;
1378 pth->is_query = is_query;
1379 pth->priority = priority;
1381 /* insertion sort (by priority, descending) */
1384 while ((NULL != pos) && (pos->priority > priority))
1389 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head, cp->pth_tail, prev, pth);
1390 if (GNUNET_YES == is_query)
1391 cp->ppd.pending_queries++;
1392 else if (GNUNET_NO == is_query)
1393 cp->ppd.pending_replies++;
1395 GNUNET_SCHEDULER_add_delayed (timeout, &peer_transmit_timeout, pth);
1396 schedule_transmission (pth);
1402 * Cancel an earlier request for transmission.
1404 * @param pth request to cancel
1407 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1409 struct GSF_ConnectedPeer *cp;
1411 if (GNUNET_SCHEDULER_NO_TASK != pth->timeout_task)
1413 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1414 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1417 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1418 if (GNUNET_YES == pth->is_query)
1419 GNUNET_assert (0 < cp->ppd.pending_queries--);
1420 else if (GNUNET_NO == pth->is_query)
1421 GNUNET_assert (0 < cp->ppd.pending_replies--);
1427 * Report on receiving a reply; update the performance record of the given peer.
1429 * @param cp responding peer (will be updated)
1430 * @param request_time time at which the original query was transmitted
1431 * @param request_priority priority of the original request
1434 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1435 struct GNUNET_TIME_Absolute request_time,
1436 uint32_t request_priority)
1438 struct GNUNET_TIME_Relative delay;
1440 delay = GNUNET_TIME_absolute_get_duration (request_time);
1441 cp->ppd.avg_reply_delay.rel_value_us =
1442 (cp->ppd.avg_reply_delay.rel_value_us * (RUNAVG_DELAY_N - 1) +
1443 delay.rel_value_us) / RUNAVG_DELAY_N;
1444 cp->ppd.avg_priority =
1445 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1446 request_priority) / RUNAVG_DELAY_N;
1451 * Report on receiving a reply in response to an initiating client.
1452 * Remember that this peer is good for this client.
1454 * @param cp responding peer (will be updated)
1455 * @param initiator_client local client on responsible for query
1458 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1459 struct GSF_LocalClient *initiator_client)
1461 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1462 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1467 * Report on receiving a reply in response to an initiating peer.
1468 * Remember that this peer is good for this initiating peer.
1470 * @param cp responding peer (will be updated)
1471 * @param initiator_peer other peer responsible for query
1474 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1475 const struct GSF_ConnectedPeer *initiator_peer)
1479 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1480 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1481 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1482 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1483 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1488 * A peer disconnected from us. Tear down the connected peer
1492 * @param peer identity of peer that connected
1495 GSF_peer_disconnect_handler_ (void *cls, const struct GNUNET_PeerIdentity *peer)
1497 struct GSF_ConnectedPeer *cp;
1498 struct GSF_PeerTransmitHandle *pth;
1499 struct GSF_DelayedHandle *dh;
1501 cp = GSF_peer_get_ (peer);
1503 return; /* must have been disconnect from core with
1504 * 'peer' == my_id, ignore */
1505 GNUNET_assert (GNUNET_YES ==
1506 GNUNET_CONTAINER_multipeermap_remove (cp_map,
1509 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
1510 GNUNET_CONTAINER_multipeermap_size (cp_map),
1512 if (NULL != cp->migration_pth)
1514 GSF_peer_transmit_cancel_ (cp->migration_pth);
1515 cp->migration_pth = NULL;
1519 GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
1522 if (GNUNET_SCHEDULER_NO_TASK != cp->rc_delay_task)
1524 GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
1525 cp->rc_delay_task = GNUNET_SCHEDULER_NO_TASK;
1527 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1528 &cancel_pending_request, cp);
1529 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1530 cp->request_map = NULL;
1531 GSF_plan_notify_peer_disconnect_ (cp);
1532 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1533 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1534 memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
1535 GSF_push_stop_ (cp);
1536 if (NULL != cp->cth)
1538 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1541 GNUNET_assert (0 == cp->cth_in_progress);
1542 while (NULL != (pth = cp->pth_head))
1544 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1546 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1547 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1549 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1550 pth->gmc (pth->gmc_cls, 0, NULL);
1553 while (NULL != (dh = cp->delayed_head))
1555 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
1556 GNUNET_SCHEDULER_cancel (dh->delay_task);
1557 GNUNET_free (dh->pm);
1560 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1561 if (GNUNET_SCHEDULER_NO_TASK != cp->mig_revive_task)
1563 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1564 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
1571 * Closure for 'call_iterator'.
1573 struct IterationContext
1576 * Function to call on each entry.
1578 GSF_ConnectedPeerIterator it;
1588 * Function that calls the callback for each peer.
1590 * @param cls the `struct IterationContext *`
1591 * @param key identity of the peer
1592 * @param value the `struct GSF_ConnectedPeer *`
1593 * @return #GNUNET_YES to continue iteration
1596 call_iterator (void *cls, const struct GNUNET_PeerIdentity * key, void *value)
1598 struct IterationContext *ic = cls;
1599 struct GSF_ConnectedPeer *cp = value;
1601 ic->it (ic->it_cls, (const struct GNUNET_PeerIdentity *) key, cp, &cp->ppd);
1607 * Iterate over all connected peers.
1609 * @param it function to call for each peer
1610 * @param it_cls closure for @a it
1613 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it, void *it_cls)
1615 struct IterationContext ic;
1619 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &call_iterator, &ic);
1624 * Obtain the identity of a connected peer.
1626 * @param cp peer to get identity of
1627 * @param id identity to set (written to)
1630 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1631 struct GNUNET_PeerIdentity *id)
1633 GNUNET_assert (0 != cp->ppd.pid);
1634 GNUNET_PEER_resolve (cp->ppd.pid, id);
1639 * Obtain the identity of a connected peer.
1641 * @param cp peer to get identity of
1642 * @return reference to peer identity, valid until peer disconnects (!)
1644 const struct GNUNET_PeerIdentity *
1645 GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp)
1647 GNUNET_assert (0 != cp->ppd.pid);
1648 return GNUNET_PEER_resolve2 (cp->ppd.pid);
1653 * Assemble a migration stop message for transmission.
1655 * @param cls the 'struct GSF_ConnectedPeer' to use
1656 * @param size number of bytes we're allowed to write to buf
1657 * @param buf where to copy the message
1658 * @return number of bytes copied to buf
1661 create_migration_stop_message (void *cls, size_t size, void *buf)
1663 struct GSF_ConnectedPeer *cp = cls;
1664 struct MigrationStopMessage msm;
1666 cp->migration_pth = NULL;
1669 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1670 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1671 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1672 msm.reserved = htonl (0);
1674 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1675 (cp->last_migration_block));
1676 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1677 GNUNET_STATISTICS_update (GSF_stats,
1678 gettext_noop ("# migration stop messages sent"),
1680 return sizeof (struct MigrationStopMessage);
1685 * Ask a peer to stop migrating data to us until the given point
1688 * @param cp peer to ask
1689 * @param block_time until when to block
1692 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1693 struct GNUNET_TIME_Absolute block_time)
1695 if (cp->last_migration_block.abs_value_us > block_time.abs_value_us)
1697 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1698 "Migration already blocked for another %s\n",
1699 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining
1700 (cp->last_migration_block), GNUNET_YES));
1701 return; /* already blocked */
1703 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %s\n",
1704 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (block_time),
1706 cp->last_migration_block = block_time;
1707 if (NULL != cp->migration_pth)
1708 GSF_peer_transmit_cancel_ (cp->migration_pth);
1710 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1711 GNUNET_TIME_UNIT_FOREVER_REL,
1712 sizeof (struct MigrationStopMessage),
1713 &create_migration_stop_message, cp);
1718 * Write peer-respect information to a file - flush the buffer entry!
1721 * @param key peer identity
1722 * @param value the 'struct GSF_ConnectedPeer' to flush
1723 * @return GNUNET_OK to continue iteration
1726 flush_respect (void *cls, const struct GNUNET_PeerIdentity * key, void *value)
1728 struct GSF_ConnectedPeer *cp = value;
1729 struct GNUNET_PeerIdentity pid;
1731 if (cp->ppd.respect == cp->disk_respect)
1732 return GNUNET_OK; /* unchanged */
1733 GNUNET_assert (0 != cp->ppd.pid);
1734 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1735 GNUNET_PEERSTORE_store (peerstore, "fs", &pid, "respect", &cp->ppd.respect,
1736 sizeof (cp->ppd.respect),
1737 GNUNET_TIME_UNIT_FOREVER_ABS,
1738 GNUNET_PEERSTORE_STOREOPTION_REPLACE, NULL, NULL);
1744 * Notify core about a preference we have for the given peer
1745 * (to allocate more resources towards it). The change will
1746 * be communicated the next time we reserve bandwidth with
1747 * core (not instantly).
1749 * @param cp peer to reserve bandwidth from
1750 * @param pref preference change
1753 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1756 cp->inc_preference += pref;
1761 * Call this method periodically to flush respect information to disk.
1763 * @param cls closure, not used
1764 * @param tc task context, not used
1767 cron_flush_respect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1772 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &flush_respect, NULL);
1775 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1777 GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
1778 GNUNET_SCHEDULER_PRIORITY_HIGH,
1779 &cron_flush_respect, NULL);
1784 * Initialize peer management subsystem.
1787 GSF_connected_peer_init_ ()
1789 cp_map = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
1790 peerstore = GNUNET_PEERSTORE_connect (GSF_cfg);
1791 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1792 &cron_flush_respect, NULL);
1797 * Iterator to free peer entries.
1799 * @param cls closure, unused
1800 * @param key current key code
1801 * @param value value in the hash map (peer entry)
1802 * @return #GNUNET_YES (we should continue to iterate)
1805 clean_peer (void *cls,
1806 const struct GNUNET_PeerIdentity *key,
1809 GSF_peer_disconnect_handler_ (NULL, key);
1815 * Shutdown peer management subsystem.
1818 GSF_connected_peer_done_ ()
1820 cron_flush_respect (NULL, NULL);
1821 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_peer, NULL);
1822 GNUNET_CONTAINER_multipeermap_destroy (cp_map);
1824 GNUNET_PEERSTORE_disconnect (peerstore, GNUNET_YES);
1829 * Iterator to remove references to LC entry.
1831 * @param cls the 'struct GSF_LocalClient*' to look for
1832 * @param key current key code
1833 * @param value value in the hash map (peer entry)
1834 * @return #GNUNET_YES (we should continue to iterate)
1837 clean_local_client (void *cls,
1838 const struct GNUNET_PeerIdentity *key,
1841 const struct GSF_LocalClient *lc = cls;
1842 struct GSF_ConnectedPeer *cp = value;
1845 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
1846 if (cp->ppd.last_client_replies[i] == lc)
1847 cp->ppd.last_client_replies[i] = NULL;
1853 * Notification that a local client disconnected. Clean up all of our
1854 * references to the given handle.
1856 * @param lc handle to the local client (henceforth invalid)
1859 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
1862 return; /* already cleaned up */
1863 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_local_client,
1868 /* end of gnunet-service-fs_cp.c */