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_load_lib.h"
28 #include "gnunet_ats_service.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"
37 * Ratio for moving average delay calculation. The previous
38 * average goes in with a factor of (n-1) into the calculation.
41 #define RUNAVG_DELAY_N 16
44 * How often do we flush respect values to disk?
46 #define RESPECT_FLUSH_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
49 * After how long do we discard a reply?
51 #define REPLY_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
54 * Collect an instane number of statistics? May cause excessive IPC.
56 #define INSANE_STATISTICS GNUNET_NO
60 * Handle to cancel a transmission request.
62 struct GSF_PeerTransmitHandle
66 * Kept in a doubly-linked list.
68 struct GSF_PeerTransmitHandle *next;
71 * Kept in a doubly-linked list.
73 struct GSF_PeerTransmitHandle *prev;
76 * Time when this transmission request was issued.
78 struct GNUNET_TIME_Absolute transmission_request_start_time;
81 * Timeout for this request.
83 struct GNUNET_TIME_Absolute timeout;
86 * Task called on timeout, or 0 for none.
88 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
91 * Function to call to get the actual message.
93 GSF_GetMessageCallback gmc;
96 * Peer this request targets.
98 struct GSF_ConnectedPeer *cp;
106 * Size of the message to be transmitted.
111 * GNUNET_YES if this is a query, GNUNET_NO for content.
116 * Did we get a reservation already?
121 * Priority of this request.
129 * Handle for an entry in our delay list.
131 struct GSF_DelayedHandle
135 * Kept in a doubly-linked list.
137 struct GSF_DelayedHandle *next;
140 * Kept in a doubly-linked list.
142 struct GSF_DelayedHandle *prev;
145 * Peer this transmission belongs to.
147 struct GSF_ConnectedPeer *cp;
150 * The PUT that was delayed.
152 struct PutMessage *pm;
155 * Task for the delay.
157 GNUNET_SCHEDULER_TaskIdentifier delay_task;
160 * Size of the message.
168 * Information per peer and request.
174 * Handle to generic request.
176 struct GSF_PendingRequest *pr;
179 * Handle to specific peer.
181 struct GSF_ConnectedPeer *cp;
184 * Task for asynchronous stopping of this request.
186 GNUNET_SCHEDULER_TaskIdentifier kill_task;
194 struct GSF_ConnectedPeer
198 * Performance data for this peer.
200 struct GSF_PeerPerformanceData ppd;
203 * Time until when we blocked this peer from migrating
206 struct GNUNET_TIME_Absolute last_migration_block;
209 * Task scheduled to revive migration to this peer.
211 GNUNET_SCHEDULER_TaskIdentifier mig_revive_task;
214 * Messages (replies, queries, content migration) we would like to
215 * send to this peer in the near future. Sorted by priority, head.
217 struct GSF_PeerTransmitHandle *pth_head;
220 * Messages (replies, queries, content migration) we would like to
221 * send to this peer in the near future. Sorted by priority, tail.
223 struct GSF_PeerTransmitHandle *pth_tail;
226 * Messages (replies, queries, content migration) we would like to
227 * send to this peer in the near future. Sorted by priority, head.
229 struct GSF_DelayedHandle *delayed_head;
232 * Messages (replies, queries, content migration) we would like to
233 * send to this peer in the near future. Sorted by priority, tail.
235 struct GSF_DelayedHandle *delayed_tail;
238 * Migration stop message in our queue, or NULL if we have none pending.
240 struct GSF_PeerTransmitHandle *migration_pth;
243 * Context of our GNUNET_ATS_reserve_bandwidth call (or NULL).
245 struct GNUNET_ATS_ReservationContext *rc;
248 * Task scheduled if we need to retry bandwidth reservation later.
250 GNUNET_SCHEDULER_TaskIdentifier rc_delay_task;
253 * Active requests from this neighbour, map of query to 'struct PeerRequest'.
255 struct GNUNET_CONTAINER_MultiHashMap *request_map;
258 * Handle for an active request for transmission to this
259 * peer, or NULL (if core queue was full).
261 struct GNUNET_CORE_TransmitHandle *cth;
264 * Increase in traffic preference still to be submitted
265 * to the core service for this peer.
267 uint64_t inc_preference;
270 * Set to 1 if we're currently in the process of calling
271 * 'GNUNET_CORE_notify_transmit_ready' (so while cth is
272 * NULL, we should not call notify_transmit_ready for this
275 unsigned int cth_in_progress;
278 * Respect rating for this peer on disk.
280 uint32_t disk_respect;
283 * Which offset in "last_p2p_replies" will be updated next?
284 * (we go round-robin).
286 unsigned int last_p2p_replies_woff;
289 * Which offset in "last_client_replies" will be updated next?
290 * (we go round-robin).
292 unsigned int last_client_replies_woff;
295 * Current offset into 'last_request_times' ring buffer.
297 unsigned int last_request_times_off;
300 * GNUNET_YES if we did successfully reserve 32k bandwidth,
309 * Map from peer identities to 'struct GSF_ConnectPeer' entries.
311 static struct GNUNET_CONTAINER_MultiHashMap *cp_map;
314 * Where do we store respect information?
316 static char *respectDirectory;
319 * Handle to ATS service.
321 static struct GNUNET_ATS_PerformanceHandle *ats;
325 * Get the filename under which we would store respect
326 * for the given peer.
328 * @param id peer to get the filename for
329 * @return filename of the form DIRECTORY/PEERID
332 get_respect_filename (const struct GNUNET_PeerIdentity *id)
334 struct GNUNET_CRYPTO_HashAsciiEncoded fil;
337 GNUNET_CRYPTO_hash_to_enc (&id->hashPubKey, &fil);
338 GNUNET_asprintf (&fn, "%s%s%s", respectDirectory, DIR_SEPARATOR_STR, &fil);
344 * Find latency information in 'atsi'.
346 * @param atsi performance data
347 * @param atsi_count number of records in 'atsi'
348 * @return connection latency
350 static struct GNUNET_TIME_Relative
351 get_latency (const struct GNUNET_ATS_Information *atsi, unsigned int atsi_count)
355 for (i = 0; i < atsi_count; i++)
356 if (ntohl (atsi->type) == GNUNET_ATS_QUALITY_NET_DELAY)
357 return GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
358 ntohl (atsi->value));
359 return GNUNET_TIME_UNIT_SECONDS;
364 * Update the performance information kept for the given peer.
366 * @param cp peer record to update
367 * @param atsi transport performance data
368 * @param atsi_count number of records in 'atsi'
371 update_atsi (struct GSF_ConnectedPeer *cp,
372 const struct GNUNET_ATS_Information *atsi, unsigned int atsi_count)
374 struct GNUNET_TIME_Relative latency;
376 latency = get_latency (atsi, atsi_count);
377 GNUNET_LOAD_value_set_decline (cp->ppd.transmission_delay, latency);
378 /* LATER: merge atsi into cp's performance data (if we ever care...) */
383 * Return the performance data record for the given peer
385 * @param cp peer to query
386 * @return performance data record for the peer
388 struct GSF_PeerPerformanceData *
389 GSF_get_peer_performance_data_ (struct GSF_ConnectedPeer *cp)
396 * Core is ready to transmit to a peer, get the message.
398 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
399 * @param size number of bytes core is willing to take
400 * @param buf where to copy the message
401 * @return number of bytes copied to buf
404 peer_transmit_ready_cb (void *cls, size_t size, void *buf);
408 * Function called by core upon success or failure of our bandwidth reservation request.
410 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
411 * @param peer identifies the peer
412 * @param amount set to the amount that was actually reserved or unreserved;
413 * either the full requested amount or zero (no partial reservations)
414 * @param res_delay if the reservation could not be satisfied (amount was 0), how
415 * long should the client wait until re-trying?
418 ats_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
419 int32_t amount, struct GNUNET_TIME_Relative res_delay);
423 * If ready (bandwidth reserved), try to schedule transmission via
424 * core for the given handle.
426 * @param pth transmission handle to schedule
429 schedule_transmission (struct GSF_PeerTransmitHandle *pth)
431 struct GSF_ConnectedPeer *cp;
432 struct GNUNET_PeerIdentity target;
435 if ((NULL != cp->cth) || (0 != cp->cth_in_progress))
436 return; /* already done */
437 GNUNET_assert (0 != cp->ppd.pid);
438 GNUNET_PEER_resolve (cp->ppd.pid, &target);
440 if (0 != cp->inc_preference)
442 GNUNET_ATS_change_preference (ats, &target, GNUNET_ATS_PREFERENCE_BANDWIDTH,
443 (double) cp->inc_preference,
444 GNUNET_ATS_PREFERENCE_END);
445 cp->inc_preference = 0;
448 if ((GNUNET_YES == pth->is_query) && (GNUNET_YES != pth->was_reserved))
450 /* query, need reservation */
451 if (GNUNET_YES != cp->did_reserve)
452 return; /* not ready */
453 cp->did_reserve = GNUNET_NO;
454 /* reservation already done! */
455 pth->was_reserved = GNUNET_YES;
457 GNUNET_ATS_reserve_bandwidth (ats, &target, DBLOCK_SIZE,
458 &ats_reserve_callback, cp);
461 GNUNET_assert (NULL == cp->cth);
462 cp->cth_in_progress++;
464 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES, pth->priority,
465 GNUNET_TIME_absolute_get_remaining
466 (pth->timeout), &target, pth->size,
467 &peer_transmit_ready_cb, cp);
468 GNUNET_assert (NULL != cp->cth);
469 GNUNET_assert (0 < cp->cth_in_progress--);
474 * Core is ready to transmit to a peer, get the message.
476 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
477 * @param size number of bytes core is willing to take
478 * @param buf where to copy the message
479 * @return number of bytes copied to buf
482 peer_transmit_ready_cb (void *cls, size_t size, void *buf)
484 struct GSF_ConnectedPeer *cp = cls;
485 struct GSF_PeerTransmitHandle *pth = cp->pth_head;
486 struct GSF_PeerTransmitHandle *pos;
492 if (pth->size > size)
494 schedule_transmission (pth);
497 if (GNUNET_SCHEDULER_NO_TASK != pth->timeout_task)
499 GNUNET_SCHEDULER_cancel (pth->timeout_task);
500 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
502 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
503 if (GNUNET_YES == pth->is_query)
505 cp->ppd.last_request_times[(cp->last_request_times_off++) %
506 MAX_QUEUE_PER_PEER] =
507 GNUNET_TIME_absolute_get ();
508 GNUNET_assert (0 < cp->ppd.pending_queries--);
510 else if (GNUNET_NO == pth->is_query)
512 GNUNET_assert (0 < cp->ppd.pending_replies--);
514 GNUNET_LOAD_update (cp->ppd.transmission_delay,
515 GNUNET_TIME_absolute_get_duration
516 (pth->transmission_request_start_time).rel_value);
517 ret = pth->gmc (pth->gmc_cls, size, buf);
518 if (NULL != (pos = cp->pth_head))
520 GNUNET_assert (pos != pth);
521 schedule_transmission (pos);
529 * (re)try to reserve bandwidth from the given peer.
531 * @param cls the 'struct GSF_ConnectedPeer' to reserve from
532 * @param tc scheduler context
535 retry_reservation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
537 struct GSF_ConnectedPeer *cp = cls;
538 struct GNUNET_PeerIdentity target;
540 GNUNET_PEER_resolve (cp->ppd.pid, &target);
541 cp->rc_delay_task = GNUNET_SCHEDULER_NO_TASK;
543 GNUNET_ATS_reserve_bandwidth (ats, &target, DBLOCK_SIZE,
544 &ats_reserve_callback, cp);
549 * Function called by core upon success or failure of our bandwidth reservation request.
551 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
552 * @param peer identifies the peer
553 * @param amount set to the amount that was actually reserved or unreserved;
554 * either the full requested amount or zero (no partial reservations)
555 * @param res_delay if the reservation could not be satisfied (amount was 0), how
556 * long should the client wait until re-trying?
559 ats_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
560 int32_t amount, struct GNUNET_TIME_Relative res_delay)
562 struct GSF_ConnectedPeer *cp = cls;
563 struct GSF_PeerTransmitHandle *pth;
565 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
566 "Reserved %d bytes / need to wait %s for reservation\n",
568 GNUNET_STRINGS_relative_time_to_string (res_delay, GNUNET_YES));
573 GNUNET_SCHEDULER_add_delayed (res_delay, &retry_reservation, cp);
576 cp->did_reserve = GNUNET_YES;
578 if ((NULL != pth) && (NULL == cp->cth) && (0 == cp->cth_in_progress))
580 /* reservation success, try transmission now! */
581 cp->cth_in_progress++;
583 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES, pth->priority,
584 GNUNET_TIME_absolute_get_remaining
585 (pth->timeout), peer, pth->size,
586 &peer_transmit_ready_cb, cp);
587 GNUNET_assert (NULL != cp->cth);
588 GNUNET_assert (0 < cp->cth_in_progress--);
594 * A peer connected to us. Setup the connected peer
597 * @param peer identity of peer that connected
598 * @param atsi performance data for the connection
599 * @param atsi_count number of records in 'atsi'
600 * @return handle to connected peer entry
602 struct GSF_ConnectedPeer *
603 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
604 const struct GNUNET_ATS_Information *atsi,
605 unsigned int atsi_count)
607 struct GSF_ConnectedPeer *cp;
611 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connected to peer %s\n",
613 cp = GNUNET_malloc (sizeof (struct GSF_ConnectedPeer));
614 cp->ppd.pid = GNUNET_PEER_intern (peer);
615 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
617 GNUNET_ATS_reserve_bandwidth (ats, peer, DBLOCK_SIZE,
618 &ats_reserve_callback, cp);
619 fn = get_respect_filename (peer);
620 if ((GNUNET_YES == GNUNET_DISK_file_test (fn)) &&
621 (sizeof (respect) == GNUNET_DISK_fn_read (fn, &respect, sizeof (respect))))
622 cp->disk_respect = cp->ppd.respect = ntohl (respect);
624 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128, GNUNET_NO);
625 GNUNET_break (GNUNET_OK ==
626 GNUNET_CONTAINER_multihashmap_put (cp_map,
627 &GSF_connected_peer_get_identity2_ (cp)->hashPubKey,
629 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
630 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
631 GNUNET_CONTAINER_multihashmap_size (cp_map),
633 update_atsi (cp, atsi, atsi_count);
634 GSF_push_start_ (cp);
640 * It may be time to re-start migrating content to this
641 * peer. Check, and if so, restart migration.
643 * @param cls the 'struct GSF_ConnectedPeer'
644 * @param tc scheduler context
647 revive_migration (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
649 struct GSF_ConnectedPeer *cp = cls;
650 struct GNUNET_TIME_Relative bt;
652 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
653 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
654 if (0 != bt.rel_value)
656 /* still time left... */
657 cp->mig_revive_task =
658 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
661 GSF_push_start_ (cp);
666 * Get a handle for a connected peer.
668 * @param peer peer's identity
669 * @return NULL if the peer is not currently connected
671 struct GSF_ConnectedPeer *
672 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
676 return GNUNET_CONTAINER_multihashmap_get (cp_map, &peer->hashPubKey);
681 * Handle P2P "MIGRATION_STOP" message.
683 * @param cls closure, always NULL
684 * @param other the other peer involved (sender or receiver, NULL
685 * for loopback messages where we are both sender and receiver)
686 * @param message the actual message
687 * @return GNUNET_OK to keep the connection open,
688 * GNUNET_SYSERR to close it (signal serious error)
691 GSF_handle_p2p_migration_stop_ (void *cls,
692 const struct GNUNET_PeerIdentity *other,
693 const struct GNUNET_MessageHeader *message)
695 struct GSF_ConnectedPeer *cp;
696 const struct MigrationStopMessage *msm;
697 struct GNUNET_TIME_Relative bt;
699 msm = (const struct MigrationStopMessage *) message;
700 cp = GSF_peer_get_ (other);
706 GNUNET_STATISTICS_update (GSF_stats,
707 gettext_noop ("# migration stop messages received"),
709 bt = GNUNET_TIME_relative_ntoh (msm->duration);
710 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
711 _("Migration of content to peer `%s' blocked for %s\n"),
713 GNUNET_STRINGS_relative_time_to_string (bt, GNUNET_YES));
714 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
715 if (GNUNET_SCHEDULER_NO_TASK == cp->mig_revive_task)
718 cp->mig_revive_task =
719 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
721 fprintf (stderr, "FIX ATS DATA: %s:%u!\n", __FILE__, __LINE__);
722 update_atsi (cp, NULL, 0);
728 * Copy reply and free put message.
730 * @param cls the 'struct PutMessage'
731 * @param buf_size number of bytes available in buf
732 * @param buf where to copy the message, NULL on error (peer disconnect)
733 * @return number of bytes copied to 'buf', can be 0 (without indicating an error)
736 copy_reply (void *cls, size_t buf_size, void *buf)
738 struct PutMessage *pm = cls;
743 GNUNET_assert (buf_size >= ntohs (pm->header.size));
744 size = ntohs (pm->header.size);
745 memcpy (buf, pm, size);
746 GNUNET_STATISTICS_update (GSF_stats,
748 ("# replies transmitted to other peers"), 1,
754 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# replies dropped"), 1,
763 * Free resources associated with the given peer request.
765 * @param peerreq request to free
766 * @param query associated key for the request
769 free_pending_request (struct PeerRequest *peerreq,
770 const struct GNUNET_HashCode *query)
772 struct GSF_ConnectedPeer *cp = peerreq->cp;
774 if (GNUNET_SCHEDULER_NO_TASK != peerreq->kill_task)
776 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
777 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
779 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
781 GNUNET_break (GNUNET_YES ==
782 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
784 GNUNET_free (peerreq);
789 * Cancel all requests associated with the peer.
792 * @param query hash code of the request
793 * @param value the 'struct GSF_PendingRequest'
794 * @return GNUNET_YES (continue to iterate)
797 cancel_pending_request (void *cls, const struct GNUNET_HashCode * query, void *value)
799 struct PeerRequest *peerreq = value;
800 struct GSF_PendingRequest *pr = peerreq->pr;
801 struct GSF_PendingRequestData *prd;
803 prd = GSF_pending_request_get_data_ (pr);
804 GSF_pending_request_cancel_ (pr, GNUNET_NO);
805 free_pending_request (peerreq, &prd->query);
811 * Free the given request.
813 * @param cls the request to free
814 * @param tc task context
817 peer_request_destroy (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
819 struct PeerRequest *peerreq = cls;
820 struct GSF_PendingRequest *pr = peerreq->pr;
821 struct GSF_PendingRequestData *prd;
823 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
824 prd = GSF_pending_request_get_data_ (pr);
825 cancel_pending_request (NULL, &prd->query, peerreq);
830 * The artificial delay is over, transmit the message now.
832 * @param cls the 'struct GSF_DelayedHandle' with the message
833 * @param tc scheduler context
836 transmit_delayed_now (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
838 struct GSF_DelayedHandle *dh = cls;
839 struct GSF_ConnectedPeer *cp = dh->cp;
841 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
842 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
844 GNUNET_free (dh->pm);
848 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT,
849 dh->msize, ©_reply, dh->pm);
855 * Get the randomized delay a response should be subjected to.
857 * @return desired delay
859 static struct GNUNET_TIME_Relative
860 get_randomized_delay ()
862 struct GNUNET_TIME_Relative ret;
865 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
866 GNUNET_CRYPTO_random_u32
867 (GNUNET_CRYPTO_QUALITY_WEAK,
868 2 * GSF_avg_latency.rel_value + 1));
869 #if INSANE_STATISTICS
870 GNUNET_STATISTICS_update (GSF_stats,
872 ("# artificial delays introduced (ms)"),
873 ret.rel_value, GNUNET_NO);
880 * Handle a reply to a pending request. Also called if a request
881 * expires (then with data == NULL). The handler may be called
882 * many times (depending on the request type), but will not be
883 * called during or after a call to GSF_pending_request_cancel
884 * and will also not be called anymore after a call signalling
887 * @param cls 'struct PeerRequest' this is an answer for
888 * @param eval evaluation of the result
889 * @param pr handle to the original pending request
890 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
891 * @param expiration when does 'data' expire?
892 * @param last_transmission when did we last transmit a request for this block
893 * @param type type of the block
894 * @param data response data, NULL on request expiration
895 * @param data_len number of bytes in data
898 handle_p2p_reply (void *cls, enum GNUNET_BLOCK_EvaluationResult eval,
899 struct GSF_PendingRequest *pr, uint32_t reply_anonymity_level,
900 struct GNUNET_TIME_Absolute expiration,
901 struct GNUNET_TIME_Absolute last_transmission,
902 enum GNUNET_BLOCK_Type type, const void *data,
905 struct PeerRequest *peerreq = cls;
906 struct GSF_ConnectedPeer *cp = peerreq->cp;
907 struct GSF_PendingRequestData *prd;
908 struct PutMessage *pm;
911 GNUNET_assert (data_len + sizeof (struct PutMessage) <
912 GNUNET_SERVER_MAX_MESSAGE_SIZE);
913 GNUNET_assert (peerreq->pr == pr);
914 prd = GSF_pending_request_get_data_ (pr);
917 free_pending_request (peerreq, &prd->query);
920 GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
921 if ((prd->type != type) && (GNUNET_BLOCK_TYPE_ANY != prd->type))
923 GNUNET_STATISTICS_update (GSF_stats,
925 ("# replies dropped due to type mismatch"),
929 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
930 "Transmitting result for query `%s' to peer\n",
931 GNUNET_h2s (&prd->query));
932 GNUNET_STATISTICS_update (GSF_stats,
933 gettext_noop ("# replies received for other peers"),
935 msize = sizeof (struct PutMessage) + data_len;
936 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
941 if ((UINT32_MAX != reply_anonymity_level) && (reply_anonymity_level > 1))
943 if (reply_anonymity_level - 1 > GSF_cover_content_count)
945 GNUNET_STATISTICS_update (GSF_stats,
947 ("# replies dropped due to insufficient cover traffic"),
951 GSF_cover_content_count -= (reply_anonymity_level - 1);
954 pm = GNUNET_malloc (msize);
955 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
956 pm->header.size = htons (msize);
957 pm->type = htonl (type);
958 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
959 memcpy (&pm[1], data, data_len);
960 if ((UINT32_MAX != reply_anonymity_level) && (0 != reply_anonymity_level) &&
961 (GNUNET_YES == GSF_enable_randomized_delays))
963 struct GSF_DelayedHandle *dh;
965 dh = GNUNET_malloc (sizeof (struct GSF_DelayedHandle));
969 GNUNET_CONTAINER_DLL_insert (cp->delayed_head, cp->delayed_tail, dh);
971 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
972 &transmit_delayed_now, dh);
976 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT, msize,
979 if (GNUNET_BLOCK_EVALUATION_OK_LAST != eval)
981 if (GNUNET_SCHEDULER_NO_TASK == peerreq->kill_task)
983 GNUNET_STATISTICS_update (GSF_stats,
985 ("# P2P searches destroyed due to ultimate reply"),
988 GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
994 * Increase the peer's respect by a value.
996 * @param cp which peer to change the respect value on
997 * @param value is the int value by which the
998 * peer's credit is to be increased or decreased
999 * @returns the actual change in respect (positive or negative)
1002 change_peer_respect (struct GSF_ConnectedPeer *cp, int value)
1006 GNUNET_assert (NULL != cp);
1009 if (cp->ppd.respect + value < cp->ppd.respect)
1011 value = UINT32_MAX - cp->ppd.respect;
1012 cp->ppd.respect = UINT32_MAX;
1015 cp->ppd.respect += value;
1019 if (cp->ppd.respect < -value)
1021 value = -cp->ppd.respect;
1022 cp->ppd.respect = 0;
1025 cp->ppd.respect += value;
1032 * We've received a request with the specified priority. Bound it
1033 * according to how much we respect the given peer.
1035 * @param prio_in requested priority
1036 * @param cp the peer making the request
1037 * @return effective priority
1040 bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
1042 #define N ((double)128.0)
1047 ld = GSF_test_get_load_too_high_ (0);
1048 if (GNUNET_SYSERR == ld)
1050 #if INSANE_STATISTICS
1051 GNUNET_STATISTICS_update (GSF_stats,
1053 ("# requests done for free (low load)"), 1,
1056 return 0; /* excess resources */
1058 if (prio_in > INT32_MAX)
1059 prio_in = INT32_MAX;
1060 ret = -change_peer_respect (cp, -(int) prio_in);
1063 if (ret > GSF_current_priorities + N)
1064 rret = GSF_current_priorities + N;
1067 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1069 if ((GNUNET_YES == ld) && (ret > 0))
1071 /* try with charging */
1072 ld = GSF_test_get_load_too_high_ (ret);
1074 if (GNUNET_YES == ld)
1076 GNUNET_STATISTICS_update (GSF_stats,
1078 ("# request dropped, priority insufficient"), 1,
1081 change_peer_respect (cp, (int) ret);
1082 return -1; /* not enough resources */
1086 GNUNET_STATISTICS_update (GSF_stats,
1088 ("# requests done for a price (normal load)"), 1,
1097 * The priority level imposes a bound on the maximum
1098 * value for the ttl that can be requested.
1100 * @param ttl_in requested ttl
1101 * @param prio given priority
1102 * @return ttl_in if ttl_in is below the limit,
1103 * otherwise the ttl-limit for the given priority
1106 bound_ttl (int32_t ttl_in, uint32_t prio)
1108 unsigned long long allowed;
1112 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1113 if (ttl_in > allowed)
1115 if (allowed >= (1 << 30))
1124 * Handle P2P "QUERY" message. Creates the pending request entry
1125 * and sets up all of the data structures to that we will
1126 * process replies properly. Does not initiate forwarding or
1127 * local database lookups.
1129 * @param other the other peer involved (sender or receiver, NULL
1130 * for loopback messages where we are both sender and receiver)
1131 * @param message the actual message
1132 * @return pending request handle, NULL on error
1134 struct GSF_PendingRequest *
1135 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1136 const struct GNUNET_MessageHeader *message)
1138 struct PeerRequest *peerreq;
1139 struct GSF_PendingRequest *pr;
1140 struct GSF_PendingRequestData *prd;
1141 struct GSF_ConnectedPeer *cp;
1142 struct GSF_ConnectedPeer *cps;
1143 const struct GNUNET_PeerIdentity *target;
1144 enum GSF_PendingRequestOptions options;
1146 const struct GetMessage *gm;
1148 const struct GNUNET_HashCode *opt;
1151 uint32_t ttl_decrement;
1154 enum GNUNET_BLOCK_Type type;
1155 GNUNET_PEER_Id spid;
1157 GNUNET_assert (other != NULL);
1158 msize = ntohs (message->size);
1159 if (msize < sizeof (struct GetMessage))
1161 GNUNET_break_op (0);
1164 GNUNET_STATISTICS_update (GSF_stats,
1166 ("# GET requests received (from other peers)"), 1,
1168 gm = (const struct GetMessage *) message;
1169 type = ntohl (gm->type);
1170 bm = ntohl (gm->hash_bitmap);
1178 if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_HashCode))
1180 GNUNET_break_op (0);
1183 opt = (const struct GNUNET_HashCode *) &gm[1];
1184 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_HashCode);
1185 /* bfsize must be power of 2, check! */
1186 if (0 != ((bfsize - 1) & bfsize))
1188 GNUNET_break_op (0);
1191 GSF_cover_query_count++;
1192 bm = ntohl (gm->hash_bitmap);
1194 cps = GSF_peer_get_ (other);
1197 /* peer must have just disconnected */
1198 GNUNET_STATISTICS_update (GSF_stats,
1200 ("# requests dropped due to initiator not being connected"),
1204 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1205 cp = GSF_peer_get_ ((const struct GNUNET_PeerIdentity *) &opt[bits++]);
1210 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1211 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1212 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
1213 GNUNET_i2s ((const struct GNUNET_PeerIdentity *)
1217 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1218 "Failed to find peer `%4s' in connection set. Dropping query.\n",
1219 GNUNET_i2s (other));
1220 #if INSANE_STATISTICS
1221 GNUNET_STATISTICS_update (GSF_stats,
1223 ("# requests dropped due to missing reverse route"),
1228 /* note that we can really only check load here since otherwise
1229 * peers could find out that we are overloaded by not being
1230 * disconnected after sending us a malformed query... */
1231 priority = bound_priority (ntohl (gm->priority), cps);
1234 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1235 "Dropping query from `%s', this peer is too busy.\n",
1236 GNUNET_i2s (other));
1239 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1240 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
1241 GNUNET_h2s (&gm->query), (unsigned int) type, GNUNET_i2s (other),
1245 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? ((const struct GNUNET_PeerIdentity
1246 *) &opt[bits++]) : NULL;
1247 options = GSF_PRO_DEFAULTS;
1249 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
1250 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1251 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value * 2 +
1252 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1254 /* don't have BW to send to peer, or would likely take longer than we have for it,
1255 * so at best indirect the query */
1257 options |= GSF_PRO_FORWARD_ONLY;
1258 spid = GNUNET_PEER_intern (other);
1259 GNUNET_assert (0 != spid);
1261 ttl = bound_ttl (ntohl (gm->ttl), priority);
1262 /* decrement ttl (always) */
1264 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1266 if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
1268 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1269 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1270 GNUNET_i2s (other), ttl, ttl_decrement);
1271 GNUNET_STATISTICS_update (GSF_stats,
1273 ("# requests dropped due TTL underflow"), 1,
1275 /* integer underflow => drop (should be very rare)! */
1278 ttl -= ttl_decrement;
1280 /* test if the request already exists */
1281 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map, &gm->query);
1282 if (peerreq != NULL)
1285 prd = GSF_pending_request_get_data_ (pr);
1286 if (prd->type == type)
1288 if (prd->ttl.abs_value >= GNUNET_TIME_absolute_get ().abs_value + ttl)
1290 /* existing request has higher TTL, drop new one! */
1291 prd->priority += priority;
1292 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1293 "Have existing request with higher TTL, dropping new request.\n",
1294 GNUNET_i2s (other));
1295 GNUNET_STATISTICS_update (GSF_stats,
1297 ("# requests dropped due to higher-TTL request"),
1301 /* existing request has lower TTL, drop old one! */
1302 priority += prd->priority;
1303 GSF_pending_request_cancel_ (pr, GNUNET_YES);
1304 free_pending_request (peerreq, &gm->query);
1308 peerreq = GNUNET_malloc (sizeof (struct PeerRequest));
1310 pr = GSF_pending_request_create_ (options, type, &gm->query,
1313 0) ? (const char *) &opt[bits] : NULL,
1314 bfsize, ntohl (gm->filter_mutator),
1316 (uint32_t) priority, ttl, spid, GNUNET_PEER_intern (other), NULL, 0, /* replies_seen */
1317 &handle_p2p_reply, peerreq);
1318 GNUNET_assert (NULL != pr);
1320 GNUNET_break (GNUNET_OK ==
1321 GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
1323 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1324 GNUNET_STATISTICS_update (GSF_stats,
1326 ("# P2P query messages received and processed"), 1,
1328 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
1335 * Function called if there has been a timeout trying to satisfy
1336 * a transmission request.
1338 * @param cls the 'struct GSF_PeerTransmitHandle' of the request
1339 * @param tc scheduler context
1342 peer_transmit_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1344 struct GSF_PeerTransmitHandle *pth = cls;
1345 struct GSF_ConnectedPeer *cp;
1347 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1348 "Timeout trying to transmit to other peer\n");
1349 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1351 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1352 if (GNUNET_YES == pth->is_query)
1353 GNUNET_assert (0 < cp->ppd.pending_queries--);
1354 else if (GNUNET_NO == pth->is_query)
1355 GNUNET_assert (0 < cp->ppd.pending_replies--);
1356 GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
1357 if (NULL != cp->cth)
1359 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1362 pth->gmc (pth->gmc_cls, 0, NULL);
1363 GNUNET_assert (0 == cp->cth_in_progress);
1369 * Transmit a message to the given peer as soon as possible.
1370 * If the peer disconnects before the transmission can happen,
1371 * the callback is invoked with a 'NULL' buffer.
1373 * @param cp target peer
1374 * @param is_query is this a query (GNUNET_YES) or content (GNUNET_NO) or neither (GNUNET_SYSERR)
1375 * @param priority how important is this request?
1376 * @param timeout when does this request timeout (call gmc with error)
1377 * @param size number of bytes we would like to send to the peer
1378 * @param gmc function to call to get the message
1379 * @param gmc_cls closure for gmc
1380 * @return handle to cancel request
1382 struct GSF_PeerTransmitHandle *
1383 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp, int is_query,
1384 uint32_t priority, struct GNUNET_TIME_Relative timeout,
1385 size_t size, GSF_GetMessageCallback gmc, void *gmc_cls)
1387 struct GSF_PeerTransmitHandle *pth;
1388 struct GSF_PeerTransmitHandle *pos;
1389 struct GSF_PeerTransmitHandle *prev;
1391 pth = GNUNET_malloc (sizeof (struct GSF_PeerTransmitHandle));
1392 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1393 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1395 pth->gmc_cls = gmc_cls;
1397 pth->is_query = is_query;
1398 pth->priority = priority;
1400 /* insertion sort (by priority, descending) */
1403 while ((NULL != pos) && (pos->priority > priority))
1408 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head, cp->pth_tail, prev, pth);
1409 if (GNUNET_YES == is_query)
1410 cp->ppd.pending_queries++;
1411 else if (GNUNET_NO == is_query)
1412 cp->ppd.pending_replies++;
1414 GNUNET_SCHEDULER_add_delayed (timeout, &peer_transmit_timeout, pth);
1415 schedule_transmission (pth);
1421 * Cancel an earlier request for transmission.
1423 * @param pth request to cancel
1426 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1428 struct GSF_ConnectedPeer *cp;
1430 if (GNUNET_SCHEDULER_NO_TASK != pth->timeout_task)
1432 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1433 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1436 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1437 if (GNUNET_YES == pth->is_query)
1438 GNUNET_assert (0 < cp->ppd.pending_queries--);
1439 else if (GNUNET_NO == pth->is_query)
1440 GNUNET_assert (0 < cp->ppd.pending_replies--);
1446 * Report on receiving a reply; update the performance record of the given peer.
1448 * @param cp responding peer (will be updated)
1449 * @param request_time time at which the original query was transmitted
1450 * @param request_priority priority of the original request
1453 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1454 struct GNUNET_TIME_Absolute request_time,
1455 uint32_t request_priority)
1457 struct GNUNET_TIME_Relative delay;
1459 delay = GNUNET_TIME_absolute_get_duration (request_time);
1460 cp->ppd.avg_reply_delay.rel_value =
1461 (cp->ppd.avg_reply_delay.rel_value * (RUNAVG_DELAY_N - 1) +
1462 delay.rel_value) / RUNAVG_DELAY_N;
1463 cp->ppd.avg_priority =
1464 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1465 request_priority) / RUNAVG_DELAY_N;
1470 * Report on receiving a reply in response to an initiating client.
1471 * Remember that this peer is good for this client.
1473 * @param cp responding peer (will be updated)
1474 * @param initiator_client local client on responsible for query
1477 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1478 struct GSF_LocalClient *initiator_client)
1480 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1481 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1486 * Report on receiving a reply in response to an initiating peer.
1487 * Remember that this peer is good for this initiating peer.
1489 * @param cp responding peer (will be updated)
1490 * @param initiator_peer other peer responsible for query
1493 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1494 const struct GSF_ConnectedPeer *initiator_peer)
1498 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1499 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1500 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1501 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1502 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1507 * A peer disconnected from us. Tear down the connected peer
1511 * @param peer identity of peer that connected
1514 GSF_peer_disconnect_handler_ (void *cls, const struct GNUNET_PeerIdentity *peer)
1516 struct GSF_ConnectedPeer *cp;
1517 struct GSF_PeerTransmitHandle *pth;
1518 struct GSF_DelayedHandle *dh;
1520 cp = GSF_peer_get_ (peer);
1522 return; /* must have been disconnect from core with
1523 * 'peer' == my_id, ignore */
1524 GNUNET_assert (GNUNET_YES ==
1525 GNUNET_CONTAINER_multihashmap_remove (cp_map,
1526 &peer->hashPubKey, cp));
1527 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
1528 GNUNET_CONTAINER_multihashmap_size (cp_map),
1530 if (NULL != cp->migration_pth)
1532 GSF_peer_transmit_cancel_ (cp->migration_pth);
1533 cp->migration_pth = NULL;
1537 GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
1540 if (GNUNET_SCHEDULER_NO_TASK != cp->rc_delay_task)
1542 GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
1543 cp->rc_delay_task = GNUNET_SCHEDULER_NO_TASK;
1545 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1546 &cancel_pending_request, cp);
1547 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1548 cp->request_map = NULL;
1549 GSF_plan_notify_peer_disconnect_ (cp);
1550 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1551 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1552 memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
1553 GSF_push_stop_ (cp);
1554 if (NULL != cp->cth)
1556 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1559 GNUNET_assert (0 == cp->cth_in_progress);
1560 while (NULL != (pth = cp->pth_head))
1562 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1564 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1565 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1567 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1568 pth->gmc (pth->gmc_cls, 0, NULL);
1571 while (NULL != (dh = cp->delayed_head))
1573 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
1574 GNUNET_SCHEDULER_cancel (dh->delay_task);
1575 GNUNET_free (dh->pm);
1578 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1579 if (GNUNET_SCHEDULER_NO_TASK != cp->mig_revive_task)
1581 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1582 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
1589 * Closure for 'call_iterator'.
1591 struct IterationContext
1594 * Function to call on each entry.
1596 GSF_ConnectedPeerIterator it;
1606 * Function that calls the callback for each peer.
1608 * @param cls the 'struct IterationContext*'
1609 * @param key identity of the peer
1610 * @param value the 'struct GSF_ConnectedPeer*'
1611 * @return GNUNET_YES to continue iteration
1614 call_iterator (void *cls, const struct GNUNET_HashCode * key, void *value)
1616 struct IterationContext *ic = cls;
1617 struct GSF_ConnectedPeer *cp = value;
1619 ic->it (ic->it_cls, (const struct GNUNET_PeerIdentity *) key, cp, &cp->ppd);
1625 * Iterate over all connected peers.
1627 * @param it function to call for each peer
1628 * @param it_cls closure for it
1631 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it, void *it_cls)
1633 struct IterationContext ic;
1637 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &call_iterator, &ic);
1642 * Obtain the identity of a connected peer.
1644 * @param cp peer to get identity of
1645 * @param id identity to set (written to)
1648 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1649 struct GNUNET_PeerIdentity *id)
1651 GNUNET_assert (0 != cp->ppd.pid);
1652 GNUNET_PEER_resolve (cp->ppd.pid, id);
1657 * Obtain the identity of a connected peer.
1659 * @param cp peer to get identity of
1660 * @return reference to peer identity, valid until peer disconnects (!)
1662 const struct GNUNET_PeerIdentity *
1663 GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp)
1665 GNUNET_assert (0 != cp->ppd.pid);
1666 return GNUNET_PEER_resolve2 (cp->ppd.pid);
1671 * Assemble a migration stop message for transmission.
1673 * @param cls the 'struct GSF_ConnectedPeer' to use
1674 * @param size number of bytes we're allowed to write to buf
1675 * @param buf where to copy the message
1676 * @return number of bytes copied to buf
1679 create_migration_stop_message (void *cls, size_t size, void *buf)
1681 struct GSF_ConnectedPeer *cp = cls;
1682 struct MigrationStopMessage msm;
1684 cp->migration_pth = NULL;
1687 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1688 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1689 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1690 msm.reserved = htonl (0);
1692 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1693 (cp->last_migration_block));
1694 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1695 GNUNET_STATISTICS_update (GSF_stats,
1696 gettext_noop ("# migration stop messages sent"),
1698 return sizeof (struct MigrationStopMessage);
1703 * Ask a peer to stop migrating data to us until the given point
1706 * @param cp peer to ask
1707 * @param block_time until when to block
1710 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1711 struct GNUNET_TIME_Absolute block_time)
1713 if (cp->last_migration_block.abs_value > block_time.abs_value)
1715 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1716 "Migration already blocked for another %s\n",
1717 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining
1718 (cp->last_migration_block), GNUNET_YES));
1719 return; /* already blocked */
1721 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %llu ms\n",
1722 (unsigned long long) GNUNET_TIME_absolute_get_remaining (block_time).rel_value);
1723 cp->last_migration_block = block_time;
1724 if (NULL != cp->migration_pth)
1725 GSF_peer_transmit_cancel_ (cp->migration_pth);
1727 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1728 GNUNET_TIME_UNIT_FOREVER_REL,
1729 sizeof (struct MigrationStopMessage),
1730 &create_migration_stop_message, cp);
1735 * Write peer-respect information to a file - flush the buffer entry!
1738 * @param key peer identity
1739 * @param value the 'struct GSF_ConnectedPeer' to flush
1740 * @return GNUNET_OK to continue iteration
1743 flush_respect (void *cls, const struct GNUNET_HashCode * key, void *value)
1745 struct GSF_ConnectedPeer *cp = value;
1748 struct GNUNET_PeerIdentity pid;
1750 if (cp->ppd.respect == cp->disk_respect)
1751 return GNUNET_OK; /* unchanged */
1752 GNUNET_assert (0 != cp->ppd.pid);
1753 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1754 fn = get_respect_filename (&pid);
1755 if (cp->ppd.respect == 0)
1757 if ((0 != UNLINK (fn)) && (errno != ENOENT))
1758 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING |
1759 GNUNET_ERROR_TYPE_BULK, "unlink", fn);
1763 respect = htonl (cp->ppd.respect);
1764 if (sizeof (uint32_t) ==
1765 GNUNET_DISK_fn_write (fn, &respect, sizeof (uint32_t),
1766 GNUNET_DISK_PERM_USER_READ |
1767 GNUNET_DISK_PERM_USER_WRITE |
1768 GNUNET_DISK_PERM_GROUP_READ |
1769 GNUNET_DISK_PERM_OTHER_READ))
1770 cp->disk_respect = cp->ppd.respect;
1778 * Notify core about a preference we have for the given peer
1779 * (to allocate more resources towards it). The change will
1780 * be communicated the next time we reserve bandwidth with
1781 * core (not instantly).
1783 * @param cp peer to reserve bandwidth from
1784 * @param pref preference change
1787 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1790 cp->inc_preference += pref;
1795 * Call this method periodically to flush respect information to disk.
1797 * @param cls closure, not used
1798 * @param tc task context, not used
1801 cron_flush_respect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1806 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &flush_respect, NULL);
1809 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1811 GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
1812 GNUNET_SCHEDULER_PRIORITY_HIGH,
1813 &cron_flush_respect, NULL);
1818 * Initialize peer management subsystem.
1821 GSF_connected_peer_init_ ()
1823 cp_map = GNUNET_CONTAINER_multihashmap_create (128, GNUNET_YES);
1824 ats = GNUNET_ATS_performance_init (GSF_cfg, NULL, NULL);
1825 GNUNET_assert (GNUNET_OK ==
1826 GNUNET_CONFIGURATION_get_value_filename (GSF_cfg, "fs",
1828 &respectDirectory));
1829 GNUNET_DISK_directory_create (respectDirectory);
1830 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1831 &cron_flush_respect, NULL);
1836 * Iterator to free peer entries.
1838 * @param cls closure, unused
1839 * @param key current key code
1840 * @param value value in the hash map (peer entry)
1841 * @return GNUNET_YES (we should continue to iterate)
1844 clean_peer (void *cls, const struct GNUNET_HashCode * key, void *value)
1846 GSF_peer_disconnect_handler_ (NULL, (const struct GNUNET_PeerIdentity *) key);
1852 * Shutdown peer management subsystem.
1855 GSF_connected_peer_done_ ()
1857 cron_flush_respect (NULL, NULL);
1858 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &clean_peer, NULL);
1859 GNUNET_CONTAINER_multihashmap_destroy (cp_map);
1861 GNUNET_free (respectDirectory);
1862 respectDirectory = NULL;
1863 GNUNET_ATS_performance_done (ats);
1869 * Iterator to remove references to LC entry.
1871 * @param cls the 'struct GSF_LocalClient*' to look for
1872 * @param key current key code
1873 * @param value value in the hash map (peer entry)
1874 * @return GNUNET_YES (we should continue to iterate)
1877 clean_local_client (void *cls, const struct GNUNET_HashCode * key, void *value)
1879 const struct GSF_LocalClient *lc = cls;
1880 struct GSF_ConnectedPeer *cp = value;
1883 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
1884 if (cp->ppd.last_client_replies[i] == lc)
1885 cp->ppd.last_client_replies[i] = NULL;
1891 * Notification that a local client disconnected. Clean up all of our
1892 * references to the given handle.
1894 * @param lc handle to the local client (henceforth invalid)
1897 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
1900 return; /* already cleaned up */
1901 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &clean_local_client,
1906 /* end of gnunet-service-fs_cp.c */