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)
55 * Handle to cancel a transmission request.
57 struct GSF_PeerTransmitHandle
61 * Kept in a doubly-linked list.
63 struct GSF_PeerTransmitHandle *next;
66 * Kept in a doubly-linked list.
68 struct GSF_PeerTransmitHandle *prev;
71 * Time when this transmission request was issued.
73 struct GNUNET_TIME_Absolute transmission_request_start_time;
76 * Timeout for this request.
78 struct GNUNET_TIME_Absolute timeout;
81 * Task called on timeout, or 0 for none.
83 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
86 * Function to call to get the actual message.
88 GSF_GetMessageCallback gmc;
91 * Peer this request targets.
93 struct GSF_ConnectedPeer *cp;
101 * Size of the message to be transmitted.
106 * GNUNET_YES if this is a query, GNUNET_NO for content.
111 * Did we get a reservation already?
116 * Priority of this request.
124 * Handle for an entry in our delay list.
126 struct GSF_DelayedHandle
130 * Kept in a doubly-linked list.
132 struct GSF_DelayedHandle *next;
135 * Kept in a doubly-linked list.
137 struct GSF_DelayedHandle *prev;
140 * Peer this transmission belongs to.
142 struct GSF_ConnectedPeer *cp;
145 * The PUT that was delayed.
147 struct PutMessage *pm;
150 * Task for the delay.
152 GNUNET_SCHEDULER_TaskIdentifier delay_task;
155 * Size of the message.
163 * Information per peer and request.
169 * Handle to generic request.
171 struct GSF_PendingRequest *pr;
174 * Handle to specific peer.
176 struct GSF_ConnectedPeer *cp;
179 * Task for asynchronous stopping of this request.
181 GNUNET_SCHEDULER_TaskIdentifier kill_task;
189 struct GSF_ConnectedPeer
193 * Performance data for this peer.
195 struct GSF_PeerPerformanceData ppd;
198 * Time until when we blocked this peer from migrating
201 struct GNUNET_TIME_Absolute last_migration_block;
204 * Task scheduled to revive migration to this peer.
206 GNUNET_SCHEDULER_TaskIdentifier mig_revive_task;
209 * Messages (replies, queries, content migration) we would like to
210 * send to this peer in the near future. Sorted by priority, head.
212 struct GSF_PeerTransmitHandle *pth_head;
215 * Messages (replies, queries, content migration) we would like to
216 * send to this peer in the near future. Sorted by priority, tail.
218 struct GSF_PeerTransmitHandle *pth_tail;
221 * Messages (replies, queries, content migration) we would like to
222 * send to this peer in the near future. Sorted by priority, head.
224 struct GSF_DelayedHandle *delayed_head;
227 * Messages (replies, queries, content migration) we would like to
228 * send to this peer in the near future. Sorted by priority, tail.
230 struct GSF_DelayedHandle *delayed_tail;
233 * Migration stop message in our queue, or NULL if we have none pending.
235 struct GSF_PeerTransmitHandle *migration_pth;
238 * Context of our GNUNET_ATS_reserve_bandwidth call (or NULL).
240 struct GNUNET_ATS_ReservationContext *rc;
243 * Task scheduled if we need to retry bandwidth reservation later.
245 GNUNET_SCHEDULER_TaskIdentifier rc_delay_task;
248 * Active requests from this neighbour, map of query to 'struct PeerRequest'.
250 struct GNUNET_CONTAINER_MultiHashMap *request_map;
253 * Handle for an active request for transmission to this
254 * peer, or NULL (if core queue was full).
256 struct GNUNET_CORE_TransmitHandle *cth;
259 * Increase in traffic preference still to be submitted
260 * to the core service for this peer.
262 uint64_t inc_preference;
265 * Set to 1 if we're currently in the process of calling
266 * 'GNUNET_CORE_notify_transmit_ready' (so while cth is
267 * NULL, we should not call notify_transmit_ready for this
270 unsigned int cth_in_progress;
273 * Respect rating for this peer on disk.
275 uint32_t disk_respect;
278 * Which offset in "last_p2p_replies" will be updated next?
279 * (we go round-robin).
281 unsigned int last_p2p_replies_woff;
284 * Which offset in "last_client_replies" will be updated next?
285 * (we go round-robin).
287 unsigned int last_client_replies_woff;
290 * Current offset into 'last_request_times' ring buffer.
292 unsigned int last_request_times_off;
295 * GNUNET_YES if we did successfully reserve 32k bandwidth,
304 * Map from peer identities to 'struct GSF_ConnectPeer' entries.
306 static struct GNUNET_CONTAINER_MultiHashMap *cp_map;
309 * Where do we store respect information?
311 static char *respectDirectory;
314 * Handle to ATS service.
316 static struct GNUNET_ATS_PerformanceHandle *ats;
320 * Get the filename under which we would store respect
321 * for the given peer.
323 * @param id peer to get the filename for
324 * @return filename of the form DIRECTORY/PEERID
327 get_respect_filename (const struct GNUNET_PeerIdentity *id)
329 struct GNUNET_CRYPTO_HashAsciiEncoded fil;
332 GNUNET_CRYPTO_hash_to_enc (&id->hashPubKey, &fil);
333 GNUNET_asprintf (&fn, "%s%s%s", respectDirectory, DIR_SEPARATOR_STR, &fil);
339 * Find latency information in 'atsi'.
341 * @param atsi performance data
342 * @param atsi_count number of records in 'atsi'
343 * @return connection latency
345 static struct GNUNET_TIME_Relative
346 get_latency (const struct GNUNET_ATS_Information *atsi, unsigned int atsi_count)
350 for (i = 0; i < atsi_count; i++)
351 if (ntohl (atsi->type) == GNUNET_ATS_QUALITY_NET_DELAY)
352 return GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
353 ntohl (atsi->value));
354 return GNUNET_TIME_UNIT_SECONDS;
359 * Update the performance information kept for the given peer.
361 * @param cp peer record to update
362 * @param atsi transport performance data
363 * @param atsi_count number of records in 'atsi'
366 update_atsi (struct GSF_ConnectedPeer *cp,
367 const struct GNUNET_ATS_Information *atsi, unsigned int atsi_count)
369 struct GNUNET_TIME_Relative latency;
371 latency = get_latency (atsi, atsi_count);
372 GNUNET_LOAD_value_set_decline (cp->ppd.transmission_delay, latency);
373 /* LATER: merge atsi into cp's performance data (if we ever care...) */
378 * Return the performance data record for the given peer
380 * @param cp peer to query
381 * @return performance data record for the peer
383 struct GSF_PeerPerformanceData *
384 GSF_get_peer_performance_data_ (struct GSF_ConnectedPeer *cp)
391 * Core is ready to transmit to a peer, get the message.
393 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
394 * @param size number of bytes core is willing to take
395 * @param buf where to copy the message
396 * @return number of bytes copied to buf
399 peer_transmit_ready_cb (void *cls, size_t size, void *buf);
403 * Function called by core upon success or failure of our bandwidth reservation request.
405 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
406 * @param peer identifies the peer
407 * @param amount set to the amount that was actually reserved or unreserved;
408 * either the full requested amount or zero (no partial reservations)
409 * @param res_delay if the reservation could not be satisfied (amount was 0), how
410 * long should the client wait until re-trying?
413 ats_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
414 int32_t amount, struct GNUNET_TIME_Relative res_delay);
418 * If ready (bandwidth reserved), try to schedule transmission via
419 * core for the given handle.
421 * @param pth transmission handle to schedule
424 schedule_transmission (struct GSF_PeerTransmitHandle *pth)
426 struct GSF_ConnectedPeer *cp;
427 struct GNUNET_PeerIdentity target;
430 if ((NULL != cp->cth) || (0 != cp->cth_in_progress))
431 return; /* already done */
432 GNUNET_assert (0 != cp->ppd.pid);
433 GNUNET_PEER_resolve (cp->ppd.pid, &target);
435 if (0 != cp->inc_preference)
437 GNUNET_ATS_change_preference (ats, &target, GNUNET_ATS_PREFERENCE_BANDWIDTH,
438 (double) cp->inc_preference,
439 GNUNET_ATS_PREFERENCE_END);
440 cp->inc_preference = 0;
443 if ((GNUNET_YES == pth->is_query) && (GNUNET_YES != pth->was_reserved))
445 /* query, need reservation */
446 if (GNUNET_YES != cp->did_reserve)
447 return; /* not ready */
448 cp->did_reserve = GNUNET_NO;
449 /* reservation already done! */
450 pth->was_reserved = GNUNET_YES;
452 GNUNET_ATS_reserve_bandwidth (ats, &target, DBLOCK_SIZE,
453 &ats_reserve_callback, cp);
456 GNUNET_assert (NULL == cp->cth);
457 cp->cth_in_progress++;
459 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES, pth->priority,
460 GNUNET_TIME_absolute_get_remaining
461 (pth->timeout), &target, pth->size,
462 &peer_transmit_ready_cb, cp);
463 GNUNET_assert (NULL != cp->cth);
464 GNUNET_assert (0 < cp->cth_in_progress--);
469 * Core is ready to transmit to a peer, get the message.
471 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
472 * @param size number of bytes core is willing to take
473 * @param buf where to copy the message
474 * @return number of bytes copied to buf
477 peer_transmit_ready_cb (void *cls, size_t size, void *buf)
479 struct GSF_ConnectedPeer *cp = cls;
480 struct GSF_PeerTransmitHandle *pth = cp->pth_head;
481 struct GSF_PeerTransmitHandle *pos;
487 if (pth->size > size)
489 schedule_transmission (pth);
492 if (GNUNET_SCHEDULER_NO_TASK != pth->timeout_task)
494 GNUNET_SCHEDULER_cancel (pth->timeout_task);
495 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
497 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
498 if (GNUNET_YES == pth->is_query)
500 cp->ppd.last_request_times[(cp->last_request_times_off++) %
501 MAX_QUEUE_PER_PEER] =
502 GNUNET_TIME_absolute_get ();
503 GNUNET_assert (0 < cp->ppd.pending_queries--);
505 else if (GNUNET_NO == pth->is_query)
507 GNUNET_assert (0 < cp->ppd.pending_replies--);
509 GNUNET_LOAD_update (cp->ppd.transmission_delay,
510 GNUNET_TIME_absolute_get_duration
511 (pth->transmission_request_start_time).rel_value);
512 ret = pth->gmc (pth->gmc_cls, size, buf);
513 if (NULL != (pos = cp->pth_head))
515 GNUNET_assert (pos != pth);
516 schedule_transmission (pos);
524 * (re)try to reserve bandwidth from the given peer.
526 * @param cls the 'struct GSF_ConnectedPeer' to reserve from
527 * @param tc scheduler context
530 retry_reservation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
532 struct GSF_ConnectedPeer *cp = cls;
533 struct GNUNET_PeerIdentity target;
535 GNUNET_PEER_resolve (cp->ppd.pid, &target);
536 cp->rc_delay_task = GNUNET_SCHEDULER_NO_TASK;
538 GNUNET_ATS_reserve_bandwidth (ats, &target, DBLOCK_SIZE,
539 &ats_reserve_callback, cp);
544 * Function called by core upon success or failure of our bandwidth reservation request.
546 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
547 * @param peer identifies the peer
548 * @param amount set to the amount that was actually reserved or unreserved;
549 * either the full requested amount or zero (no partial reservations)
550 * @param res_delay if the reservation could not be satisfied (amount was 0), how
551 * long should the client wait until re-trying?
554 ats_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
555 int32_t amount, struct GNUNET_TIME_Relative res_delay)
557 struct GSF_ConnectedPeer *cp = cls;
558 struct GSF_PeerTransmitHandle *pth;
560 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
561 "Reserved %d bytes / need to wait %s for reservation\n",
563 GNUNET_STRINGS_relative_time_to_string (res_delay, GNUNET_YES));
568 GNUNET_SCHEDULER_add_delayed (res_delay, &retry_reservation, cp);
571 cp->did_reserve = GNUNET_YES;
573 if ((NULL != pth) && (NULL == cp->cth) && (0 == cp->cth_in_progress))
575 /* reservation success, try transmission now! */
576 cp->cth_in_progress++;
578 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES, pth->priority,
579 GNUNET_TIME_absolute_get_remaining
580 (pth->timeout), peer, pth->size,
581 &peer_transmit_ready_cb, cp);
582 GNUNET_assert (NULL != cp->cth);
583 GNUNET_assert (0 < cp->cth_in_progress--);
589 * A peer connected to us. Setup the connected peer
592 * @param peer identity of peer that connected
593 * @param atsi performance data for the connection
594 * @param atsi_count number of records in 'atsi'
595 * @return handle to connected peer entry
597 struct GSF_ConnectedPeer *
598 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
599 const struct GNUNET_ATS_Information *atsi,
600 unsigned int atsi_count)
602 struct GSF_ConnectedPeer *cp;
606 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connected to peer %s\n",
608 cp = GNUNET_malloc (sizeof (struct GSF_ConnectedPeer));
609 cp->ppd.pid = GNUNET_PEER_intern (peer);
610 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
612 GNUNET_ATS_reserve_bandwidth (ats, peer, DBLOCK_SIZE,
613 &ats_reserve_callback, cp);
614 fn = get_respect_filename (peer);
615 if ((GNUNET_YES == GNUNET_DISK_file_test (fn)) &&
616 (sizeof (respect) == GNUNET_DISK_fn_read (fn, &respect, sizeof (respect))))
617 cp->disk_respect = cp->ppd.respect = ntohl (respect);
619 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128, GNUNET_NO);
620 GNUNET_break (GNUNET_OK ==
621 GNUNET_CONTAINER_multihashmap_put (cp_map,
622 &GSF_connected_peer_get_identity2_ (cp)->hashPubKey,
624 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
625 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
626 GNUNET_CONTAINER_multihashmap_size (cp_map),
628 update_atsi (cp, atsi, atsi_count);
629 GSF_push_start_ (cp);
635 * It may be time to re-start migrating content to this
636 * peer. Check, and if so, restart migration.
638 * @param cls the 'struct GSF_ConnectedPeer'
639 * @param tc scheduler context
642 revive_migration (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
644 struct GSF_ConnectedPeer *cp = cls;
645 struct GNUNET_TIME_Relative bt;
647 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
648 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
649 if (0 != bt.rel_value)
651 /* still time left... */
652 cp->mig_revive_task =
653 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
656 GSF_push_start_ (cp);
661 * Get a handle for a connected peer.
663 * @param peer peer's identity
664 * @return NULL if the peer is not currently connected
666 struct GSF_ConnectedPeer *
667 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
671 return GNUNET_CONTAINER_multihashmap_get (cp_map, &peer->hashPubKey);
676 * Handle P2P "MIGRATION_STOP" message.
678 * @param cls closure, always NULL
679 * @param other the other peer involved (sender or receiver, NULL
680 * for loopback messages where we are both sender and receiver)
681 * @param message the actual message
682 * @param atsi performance information
683 * @param atsi_count number of records in 'atsi'
684 * @return GNUNET_OK to keep the connection open,
685 * GNUNET_SYSERR to close it (signal serious error)
688 GSF_handle_p2p_migration_stop_ (void *cls,
689 const struct GNUNET_PeerIdentity *other,
690 const struct GNUNET_MessageHeader *message,
691 const struct GNUNET_ATS_Information *atsi,
692 unsigned int atsi_count)
694 struct GSF_ConnectedPeer *cp;
695 const struct MigrationStopMessage *msm;
696 struct GNUNET_TIME_Relative bt;
698 msm = (const struct MigrationStopMessage *) message;
699 cp = GSF_peer_get_ (other);
705 GNUNET_STATISTICS_update (GSF_stats,
706 gettext_noop ("# migration stop messages received"),
708 bt = GNUNET_TIME_relative_ntoh (msm->duration);
709 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
710 _("Migration of content to peer `%s' blocked for %s\n"),
712 GNUNET_STRINGS_relative_time_to_string (bt, GNUNET_YES));
713 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
714 if (GNUNET_SCHEDULER_NO_TASK == cp->mig_revive_task)
717 cp->mig_revive_task =
718 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
720 update_atsi (cp, atsi, atsi_count);
726 * Copy reply and free put message.
728 * @param cls the 'struct PutMessage'
729 * @param buf_size number of bytes available in buf
730 * @param buf where to copy the message, NULL on error (peer disconnect)
731 * @return number of bytes copied to 'buf', can be 0 (without indicating an error)
734 copy_reply (void *cls, size_t buf_size, void *buf)
736 struct PutMessage *pm = cls;
741 GNUNET_assert (buf_size >= ntohs (pm->header.size));
742 size = ntohs (pm->header.size);
743 memcpy (buf, pm, size);
744 GNUNET_STATISTICS_update (GSF_stats,
746 ("# replies transmitted to other peers"), 1,
752 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# replies dropped"), 1,
761 * Free resources associated with the given peer request.
763 * @param peerreq request to free
764 * @param query associated key for the request
767 free_pending_request (struct PeerRequest *peerreq,
768 const struct GNUNET_HashCode *query)
770 struct GSF_ConnectedPeer *cp = peerreq->cp;
772 if (GNUNET_SCHEDULER_NO_TASK != peerreq->kill_task)
774 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
775 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
777 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
779 GNUNET_break (GNUNET_YES ==
780 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
782 GNUNET_free (peerreq);
787 * Cancel all requests associated with the peer.
790 * @param query hash code of the request
791 * @param value the 'struct GSF_PendingRequest'
792 * @return GNUNET_YES (continue to iterate)
795 cancel_pending_request (void *cls, const struct GNUNET_HashCode * query, void *value)
797 struct PeerRequest *peerreq = value;
798 struct GSF_PendingRequest *pr = peerreq->pr;
799 struct GSF_PendingRequestData *prd;
801 prd = GSF_pending_request_get_data_ (pr);
802 GSF_pending_request_cancel_ (pr, GNUNET_NO);
803 free_pending_request (peerreq, &prd->query);
809 * Free the given request.
811 * @param cls the request to free
812 * @param tc task context
815 peer_request_destroy (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
817 struct PeerRequest *peerreq = cls;
818 struct GSF_PendingRequest *pr = peerreq->pr;
819 struct GSF_PendingRequestData *prd;
821 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
822 prd = GSF_pending_request_get_data_ (pr);
823 cancel_pending_request (NULL, &prd->query, peerreq);
828 * The artificial delay is over, transmit the message now.
830 * @param cls the 'struct GSF_DelayedHandle' with the message
831 * @param tc scheduler context
834 transmit_delayed_now (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
836 struct GSF_DelayedHandle *dh = cls;
837 struct GSF_ConnectedPeer *cp = dh->cp;
839 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
840 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
842 GNUNET_free (dh->pm);
846 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT,
847 dh->msize, ©_reply, dh->pm);
853 * Get the randomized delay a response should be subjected to.
855 * @return desired delay
857 static struct GNUNET_TIME_Relative
858 get_randomized_delay ()
860 struct GNUNET_TIME_Relative ret;
863 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
864 GNUNET_CRYPTO_random_u32
865 (GNUNET_CRYPTO_QUALITY_WEAK,
866 2 * GSF_avg_latency.rel_value + 1));
867 GNUNET_STATISTICS_update (GSF_stats,
869 ("# artificial delays introduced (ms)"),
870 ret.rel_value, GNUNET_NO);
877 * Handle a reply to a pending request. Also called if a request
878 * expires (then with data == NULL). The handler may be called
879 * many times (depending on the request type), but will not be
880 * called during or after a call to GSF_pending_request_cancel
881 * and will also not be called anymore after a call signalling
884 * @param cls 'struct PeerRequest' this is an answer for
885 * @param eval evaluation of the result
886 * @param pr handle to the original pending request
887 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
888 * @param expiration when does 'data' expire?
889 * @param last_transmission when did we last transmit a request for this block
890 * @param type type of the block
891 * @param data response data, NULL on request expiration
892 * @param data_len number of bytes in data
895 handle_p2p_reply (void *cls, enum GNUNET_BLOCK_EvaluationResult eval,
896 struct GSF_PendingRequest *pr, uint32_t reply_anonymity_level,
897 struct GNUNET_TIME_Absolute expiration,
898 struct GNUNET_TIME_Absolute last_transmission,
899 enum GNUNET_BLOCK_Type type, const void *data,
902 struct PeerRequest *peerreq = cls;
903 struct GSF_ConnectedPeer *cp = peerreq->cp;
904 struct GSF_PendingRequestData *prd;
905 struct PutMessage *pm;
908 GNUNET_assert (data_len + sizeof (struct PutMessage) <
909 GNUNET_SERVER_MAX_MESSAGE_SIZE);
910 GNUNET_assert (peerreq->pr == pr);
911 prd = GSF_pending_request_get_data_ (pr);
914 free_pending_request (peerreq, &prd->query);
917 GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
918 if ((prd->type != type) && (GNUNET_BLOCK_TYPE_ANY != prd->type))
920 GNUNET_STATISTICS_update (GSF_stats,
922 ("# replies dropped due to type mismatch"),
926 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
927 "Transmitting result for query `%s' to peer\n",
928 GNUNET_h2s (&prd->query));
929 GNUNET_STATISTICS_update (GSF_stats,
930 gettext_noop ("# replies received for other peers"),
932 msize = sizeof (struct PutMessage) + data_len;
933 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
938 if ((UINT32_MAX != reply_anonymity_level) && (reply_anonymity_level > 1))
940 if (reply_anonymity_level - 1 > GSF_cover_content_count)
942 GNUNET_STATISTICS_update (GSF_stats,
944 ("# replies dropped due to insufficient cover traffic"),
948 GSF_cover_content_count -= (reply_anonymity_level - 1);
951 pm = GNUNET_malloc (msize);
952 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
953 pm->header.size = htons (msize);
954 pm->type = htonl (type);
955 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
956 memcpy (&pm[1], data, data_len);
957 if ((UINT32_MAX != reply_anonymity_level) && (0 != reply_anonymity_level) &&
958 (GNUNET_YES == GSF_enable_randomized_delays))
960 struct GSF_DelayedHandle *dh;
962 dh = GNUNET_malloc (sizeof (struct GSF_DelayedHandle));
966 GNUNET_CONTAINER_DLL_insert (cp->delayed_head, cp->delayed_tail, dh);
968 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
969 &transmit_delayed_now, dh);
973 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT, msize,
976 if (GNUNET_BLOCK_EVALUATION_OK_LAST != eval)
978 if (GNUNET_SCHEDULER_NO_TASK == peerreq->kill_task)
980 GNUNET_STATISTICS_update (GSF_stats,
982 ("# P2P searches destroyed due to ultimate reply"),
985 GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
991 * Increase the peer's respect by a value.
993 * @param cp which peer to change the respect value on
994 * @param value is the int value by which the
995 * peer's credit is to be increased or decreased
996 * @returns the actual change in respect (positive or negative)
999 change_peer_respect (struct GSF_ConnectedPeer *cp, int value)
1003 GNUNET_assert (NULL != cp);
1006 if (cp->ppd.respect + value < cp->ppd.respect)
1008 value = UINT32_MAX - cp->ppd.respect;
1009 cp->ppd.respect = UINT32_MAX;
1012 cp->ppd.respect += value;
1016 if (cp->ppd.respect < -value)
1018 value = -cp->ppd.respect;
1019 cp->ppd.respect = 0;
1022 cp->ppd.respect += value;
1029 * We've received a request with the specified priority. Bound it
1030 * according to how much we respect the given peer.
1032 * @param prio_in requested priority
1033 * @param cp the peer making the request
1034 * @return effective priority
1037 bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
1039 #define N ((double)128.0)
1044 ld = GSF_test_get_load_too_high_ (0);
1045 if (GNUNET_SYSERR == ld)
1047 GNUNET_STATISTICS_update (GSF_stats,
1049 ("# requests done for free (low load)"), 1,
1051 return 0; /* excess resources */
1053 if (prio_in > INT32_MAX)
1054 prio_in = INT32_MAX;
1055 ret = -change_peer_respect (cp, -(int) prio_in);
1058 if (ret > GSF_current_priorities + N)
1059 rret = GSF_current_priorities + N;
1062 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1064 if ((GNUNET_YES == ld) && (ret > 0))
1066 /* try with charging */
1067 ld = GSF_test_get_load_too_high_ (ret);
1069 if (GNUNET_YES == ld)
1071 GNUNET_STATISTICS_update (GSF_stats,
1073 ("# request dropped, priority insufficient"), 1,
1076 change_peer_respect (cp, (int) ret);
1077 return -1; /* not enough resources */
1081 GNUNET_STATISTICS_update (GSF_stats,
1083 ("# requests done for a price (normal load)"), 1,
1092 * The priority level imposes a bound on the maximum
1093 * value for the ttl that can be requested.
1095 * @param ttl_in requested ttl
1096 * @param prio given priority
1097 * @return ttl_in if ttl_in is below the limit,
1098 * otherwise the ttl-limit for the given priority
1101 bound_ttl (int32_t ttl_in, uint32_t prio)
1103 unsigned long long allowed;
1107 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1108 if (ttl_in > allowed)
1110 if (allowed >= (1 << 30))
1119 * Handle P2P "QUERY" message. Creates the pending request entry
1120 * and sets up all of the data structures to that we will
1121 * process replies properly. Does not initiate forwarding or
1122 * local database lookups.
1124 * @param other the other peer involved (sender or receiver, NULL
1125 * for loopback messages where we are both sender and receiver)
1126 * @param message the actual message
1127 * @return pending request handle, NULL on error
1129 struct GSF_PendingRequest *
1130 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1131 const struct GNUNET_MessageHeader *message)
1133 struct PeerRequest *peerreq;
1134 struct GSF_PendingRequest *pr;
1135 struct GSF_PendingRequestData *prd;
1136 struct GSF_ConnectedPeer *cp;
1137 struct GSF_ConnectedPeer *cps;
1138 const struct GNUNET_HashCode *namespace;
1139 const struct GNUNET_PeerIdentity *target;
1140 enum GSF_PendingRequestOptions options;
1142 const struct GetMessage *gm;
1144 const struct GNUNET_HashCode *opt;
1147 uint32_t ttl_decrement;
1150 enum GNUNET_BLOCK_Type type;
1151 GNUNET_PEER_Id spid;
1153 GNUNET_assert (other != NULL);
1154 msize = ntohs (message->size);
1155 if (msize < sizeof (struct GetMessage))
1157 GNUNET_break_op (0);
1160 GNUNET_STATISTICS_update (GSF_stats,
1162 ("# GET requests received (from other peers)"), 1,
1164 gm = (const struct GetMessage *) message;
1165 type = ntohl (gm->type);
1166 bm = ntohl (gm->hash_bitmap);
1174 if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_HashCode))
1176 GNUNET_break_op (0);
1179 opt = (const struct GNUNET_HashCode *) &gm[1];
1180 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_HashCode);
1181 /* bfsize must be power of 2, check! */
1182 if (0 != ((bfsize - 1) & bfsize))
1184 GNUNET_break_op (0);
1187 GSF_cover_query_count++;
1188 bm = ntohl (gm->hash_bitmap);
1190 cps = GSF_peer_get_ (other);
1193 /* peer must have just disconnected */
1194 GNUNET_STATISTICS_update (GSF_stats,
1196 ("# requests dropped due to initiator not being connected"),
1200 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1201 cp = GSF_peer_get_ ((const struct GNUNET_PeerIdentity *) &opt[bits++]);
1206 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1207 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1208 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
1209 GNUNET_i2s ((const struct GNUNET_PeerIdentity *)
1213 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1214 "Failed to find peer `%4s' in connection set. Dropping query.\n",
1215 GNUNET_i2s (other));
1216 GNUNET_STATISTICS_update (GSF_stats,
1218 ("# requests dropped due to missing reverse route"),
1222 /* note that we can really only check load here since otherwise
1223 * peers could find out that we are overloaded by not being
1224 * disconnected after sending us a malformed query... */
1225 priority = bound_priority (ntohl (gm->priority), cps);
1228 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1229 "Dropping query from `%s', this peer is too busy.\n",
1230 GNUNET_i2s (other));
1233 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1234 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
1235 GNUNET_h2s (&gm->query), (unsigned int) type, GNUNET_i2s (other),
1237 namespace = (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE)) ? &opt[bits++] : NULL;
1238 if ((GNUNET_BLOCK_TYPE_FS_SBLOCK == type) && (NULL == namespace))
1240 GNUNET_break_op (0);
1243 if ((GNUNET_BLOCK_TYPE_FS_SBLOCK != type) && (NULL != namespace))
1245 GNUNET_break_op (0);
1250 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? ((const struct GNUNET_PeerIdentity
1251 *) &opt[bits++]) : NULL;
1252 options = GSF_PRO_DEFAULTS;
1254 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
1255 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1256 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value * 2 +
1257 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1259 /* don't have BW to send to peer, or would likely take longer than we have for it,
1260 * so at best indirect the query */
1262 options |= GSF_PRO_FORWARD_ONLY;
1263 spid = GNUNET_PEER_intern (other);
1264 GNUNET_assert (0 != spid);
1266 ttl = bound_ttl (ntohl (gm->ttl), priority);
1267 /* decrement ttl (always) */
1269 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1271 if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
1273 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1274 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1275 GNUNET_i2s (other), ttl, ttl_decrement);
1276 GNUNET_STATISTICS_update (GSF_stats,
1278 ("# requests dropped due TTL underflow"), 1,
1280 /* integer underflow => drop (should be very rare)! */
1283 ttl -= ttl_decrement;
1285 /* test if the request already exists */
1286 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map, &gm->query);
1287 if (peerreq != NULL)
1290 prd = GSF_pending_request_get_data_ (pr);
1291 if ((prd->type == type) &&
1292 ((type != GNUNET_BLOCK_TYPE_FS_SBLOCK) ||
1293 (0 == memcmp (&prd->namespace, namespace, sizeof (struct GNUNET_HashCode)))))
1295 if (prd->ttl.abs_value >= GNUNET_TIME_absolute_get ().abs_value + ttl)
1297 /* existing request has higher TTL, drop new one! */
1298 prd->priority += priority;
1299 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1300 "Have existing request with higher TTL, dropping new request.\n",
1301 GNUNET_i2s (other));
1302 GNUNET_STATISTICS_update (GSF_stats,
1304 ("# requests dropped due to higher-TTL request"),
1308 /* existing request has lower TTL, drop old one! */
1309 priority += prd->priority;
1310 GSF_pending_request_cancel_ (pr, GNUNET_YES);
1311 free_pending_request (peerreq, &gm->query);
1315 peerreq = GNUNET_malloc (sizeof (struct PeerRequest));
1317 pr = GSF_pending_request_create_ (options, type, &gm->query, namespace,
1320 0) ? (const char *) &opt[bits] : NULL,
1321 bfsize, ntohl (gm->filter_mutator),
1323 (uint32_t) priority, ttl, spid, GNUNET_PEER_intern (other), NULL, 0, /* replies_seen */
1324 &handle_p2p_reply, peerreq);
1325 GNUNET_assert (NULL != pr);
1327 GNUNET_break (GNUNET_OK ==
1328 GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
1330 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1331 GNUNET_STATISTICS_update (GSF_stats,
1333 ("# P2P query messages received and processed"), 1,
1335 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
1342 * Function called if there has been a timeout trying to satisfy
1343 * a transmission request.
1345 * @param cls the 'struct GSF_PeerTransmitHandle' of the request
1346 * @param tc scheduler context
1349 peer_transmit_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1351 struct GSF_PeerTransmitHandle *pth = cls;
1352 struct GSF_ConnectedPeer *cp;
1354 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1355 "Timeout trying to transmit to other peer\n");
1356 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1358 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1359 if (GNUNET_YES == pth->is_query)
1360 GNUNET_assert (0 < cp->ppd.pending_queries--);
1361 else if (GNUNET_NO == pth->is_query)
1362 GNUNET_assert (0 < cp->ppd.pending_replies--);
1363 GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
1364 if (NULL != cp->cth)
1366 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1369 pth->gmc (pth->gmc_cls, 0, NULL);
1370 GNUNET_assert (0 == cp->cth_in_progress);
1376 * Transmit a message to the given peer as soon as possible.
1377 * If the peer disconnects before the transmission can happen,
1378 * the callback is invoked with a 'NULL' buffer.
1380 * @param cp target peer
1381 * @param is_query is this a query (GNUNET_YES) or content (GNUNET_NO) or neither (GNUNET_SYSERR)
1382 * @param priority how important is this request?
1383 * @param timeout when does this request timeout (call gmc with error)
1384 * @param size number of bytes we would like to send to the peer
1385 * @param gmc function to call to get the message
1386 * @param gmc_cls closure for gmc
1387 * @return handle to cancel request
1389 struct GSF_PeerTransmitHandle *
1390 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp, int is_query,
1391 uint32_t priority, struct GNUNET_TIME_Relative timeout,
1392 size_t size, GSF_GetMessageCallback gmc, void *gmc_cls)
1394 struct GSF_PeerTransmitHandle *pth;
1395 struct GSF_PeerTransmitHandle *pos;
1396 struct GSF_PeerTransmitHandle *prev;
1398 pth = GNUNET_malloc (sizeof (struct GSF_PeerTransmitHandle));
1399 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1400 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1402 pth->gmc_cls = gmc_cls;
1404 pth->is_query = is_query;
1405 pth->priority = priority;
1407 /* insertion sort (by priority, descending) */
1410 while ((NULL != pos) && (pos->priority > priority))
1415 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head, cp->pth_tail, prev, pth);
1416 if (GNUNET_YES == is_query)
1417 cp->ppd.pending_queries++;
1418 else if (GNUNET_NO == is_query)
1419 cp->ppd.pending_replies++;
1421 GNUNET_SCHEDULER_add_delayed (timeout, &peer_transmit_timeout, pth);
1422 schedule_transmission (pth);
1428 * Cancel an earlier request for transmission.
1430 * @param pth request to cancel
1433 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1435 struct GSF_ConnectedPeer *cp;
1437 if (GNUNET_SCHEDULER_NO_TASK != pth->timeout_task)
1439 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1440 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1443 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1444 if (GNUNET_YES == pth->is_query)
1445 GNUNET_assert (0 < cp->ppd.pending_queries--);
1446 else if (GNUNET_NO == pth->is_query)
1447 GNUNET_assert (0 < cp->ppd.pending_replies--);
1453 * Report on receiving a reply; update the performance record of the given peer.
1455 * @param cp responding peer (will be updated)
1456 * @param request_time time at which the original query was transmitted
1457 * @param request_priority priority of the original request
1460 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1461 struct GNUNET_TIME_Absolute request_time,
1462 uint32_t request_priority)
1464 struct GNUNET_TIME_Relative delay;
1466 delay = GNUNET_TIME_absolute_get_duration (request_time);
1467 cp->ppd.avg_reply_delay.rel_value =
1468 (cp->ppd.avg_reply_delay.rel_value * (RUNAVG_DELAY_N - 1) +
1469 delay.rel_value) / RUNAVG_DELAY_N;
1470 cp->ppd.avg_priority =
1471 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1472 request_priority) / RUNAVG_DELAY_N;
1477 * Report on receiving a reply in response to an initiating client.
1478 * Remember that this peer is good for this client.
1480 * @param cp responding peer (will be updated)
1481 * @param initiator_client local client on responsible for query
1484 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1485 struct GSF_LocalClient *initiator_client)
1487 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1488 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1493 * Report on receiving a reply in response to an initiating peer.
1494 * Remember that this peer is good for this initiating peer.
1496 * @param cp responding peer (will be updated)
1497 * @param initiator_peer other peer responsible for query
1500 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1501 const struct GSF_ConnectedPeer *initiator_peer)
1505 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1506 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1507 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1508 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1509 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1514 * A peer disconnected from us. Tear down the connected peer
1518 * @param peer identity of peer that connected
1521 GSF_peer_disconnect_handler_ (void *cls, const struct GNUNET_PeerIdentity *peer)
1523 struct GSF_ConnectedPeer *cp;
1524 struct GSF_PeerTransmitHandle *pth;
1525 struct GSF_DelayedHandle *dh;
1527 cp = GSF_peer_get_ (peer);
1529 return; /* must have been disconnect from core with
1530 * 'peer' == my_id, ignore */
1531 GNUNET_assert (GNUNET_YES ==
1532 GNUNET_CONTAINER_multihashmap_remove (cp_map,
1533 &peer->hashPubKey, cp));
1534 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
1535 GNUNET_CONTAINER_multihashmap_size (cp_map),
1537 if (NULL != cp->migration_pth)
1539 GSF_peer_transmit_cancel_ (cp->migration_pth);
1540 cp->migration_pth = NULL;
1544 GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
1547 if (GNUNET_SCHEDULER_NO_TASK != cp->rc_delay_task)
1549 GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
1550 cp->rc_delay_task = GNUNET_SCHEDULER_NO_TASK;
1552 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1553 &cancel_pending_request, cp);
1554 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1555 cp->request_map = NULL;
1556 GSF_plan_notify_peer_disconnect_ (cp);
1557 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1558 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1559 memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
1560 GSF_push_stop_ (cp);
1561 if (NULL != cp->cth)
1563 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1566 GNUNET_assert (0 == cp->cth_in_progress);
1567 while (NULL != (pth = cp->pth_head))
1569 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1571 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1572 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1574 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1575 pth->gmc (pth->gmc_cls, 0, NULL);
1578 while (NULL != (dh = cp->delayed_head))
1580 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
1581 GNUNET_SCHEDULER_cancel (dh->delay_task);
1582 GNUNET_free (dh->pm);
1585 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1586 if (GNUNET_SCHEDULER_NO_TASK != cp->mig_revive_task)
1588 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1589 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
1596 * Closure for 'call_iterator'.
1598 struct IterationContext
1601 * Function to call on each entry.
1603 GSF_ConnectedPeerIterator it;
1613 * Function that calls the callback for each peer.
1615 * @param cls the 'struct IterationContext*'
1616 * @param key identity of the peer
1617 * @param value the 'struct GSF_ConnectedPeer*'
1618 * @return GNUNET_YES to continue iteration
1621 call_iterator (void *cls, const struct GNUNET_HashCode * key, void *value)
1623 struct IterationContext *ic = cls;
1624 struct GSF_ConnectedPeer *cp = value;
1626 ic->it (ic->it_cls, (const struct GNUNET_PeerIdentity *) key, cp, &cp->ppd);
1632 * Iterate over all connected peers.
1634 * @param it function to call for each peer
1635 * @param it_cls closure for it
1638 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it, void *it_cls)
1640 struct IterationContext ic;
1644 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &call_iterator, &ic);
1649 * Obtain the identity of a connected peer.
1651 * @param cp peer to get identity of
1652 * @param id identity to set (written to)
1655 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1656 struct GNUNET_PeerIdentity *id)
1658 GNUNET_assert (0 != cp->ppd.pid);
1659 GNUNET_PEER_resolve (cp->ppd.pid, id);
1664 * Obtain the identity of a connected peer.
1666 * @param cp peer to get identity of
1667 * @return reference to peer identity, valid until peer disconnects (!)
1669 const struct GNUNET_PeerIdentity *
1670 GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp)
1672 GNUNET_assert (0 != cp->ppd.pid);
1673 return GNUNET_PEER_resolve2 (cp->ppd.pid);
1678 * Assemble a migration stop message for transmission.
1680 * @param cls the 'struct GSF_ConnectedPeer' to use
1681 * @param size number of bytes we're allowed to write to buf
1682 * @param buf where to copy the message
1683 * @return number of bytes copied to buf
1686 create_migration_stop_message (void *cls, size_t size, void *buf)
1688 struct GSF_ConnectedPeer *cp = cls;
1689 struct MigrationStopMessage msm;
1691 cp->migration_pth = NULL;
1694 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1695 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1696 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1697 msm.reserved = htonl (0);
1699 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1700 (cp->last_migration_block));
1701 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1702 GNUNET_STATISTICS_update (GSF_stats,
1703 gettext_noop ("# migration stop messages sent"),
1705 return sizeof (struct MigrationStopMessage);
1710 * Ask a peer to stop migrating data to us until the given point
1713 * @param cp peer to ask
1714 * @param block_time until when to block
1717 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1718 struct GNUNET_TIME_Absolute block_time)
1720 if (cp->last_migration_block.abs_value > block_time.abs_value)
1722 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1723 "Migration already blocked for another %s\n",
1724 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining
1725 (cp->last_migration_block), GNUNET_YES));
1726 return; /* already blocked */
1728 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %llu ms\n",
1729 (unsigned long long) GNUNET_TIME_absolute_get_remaining (block_time).rel_value);
1730 cp->last_migration_block = block_time;
1731 if (NULL != cp->migration_pth)
1732 GSF_peer_transmit_cancel_ (cp->migration_pth);
1734 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1735 GNUNET_TIME_UNIT_FOREVER_REL,
1736 sizeof (struct MigrationStopMessage),
1737 &create_migration_stop_message, cp);
1742 * Write peer-respect information to a file - flush the buffer entry!
1745 * @param key peer identity
1746 * @param value the 'struct GSF_ConnectedPeer' to flush
1747 * @return GNUNET_OK to continue iteration
1750 flush_respect (void *cls, const struct GNUNET_HashCode * key, void *value)
1752 struct GSF_ConnectedPeer *cp = value;
1755 struct GNUNET_PeerIdentity pid;
1757 if (cp->ppd.respect == cp->disk_respect)
1758 return GNUNET_OK; /* unchanged */
1759 GNUNET_assert (0 != cp->ppd.pid);
1760 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1761 fn = get_respect_filename (&pid);
1762 if (cp->ppd.respect == 0)
1764 if ((0 != UNLINK (fn)) && (errno != ENOENT))
1765 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING |
1766 GNUNET_ERROR_TYPE_BULK, "unlink", fn);
1770 respect = htonl (cp->ppd.respect);
1771 if (sizeof (uint32_t) ==
1772 GNUNET_DISK_fn_write (fn, &respect, sizeof (uint32_t),
1773 GNUNET_DISK_PERM_USER_READ |
1774 GNUNET_DISK_PERM_USER_WRITE |
1775 GNUNET_DISK_PERM_GROUP_READ |
1776 GNUNET_DISK_PERM_OTHER_READ))
1777 cp->disk_respect = cp->ppd.respect;
1785 * Notify core about a preference we have for the given peer
1786 * (to allocate more resources towards it). The change will
1787 * be communicated the next time we reserve bandwidth with
1788 * core (not instantly).
1790 * @param cp peer to reserve bandwidth from
1791 * @param pref preference change
1794 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1797 cp->inc_preference += pref;
1802 * Call this method periodically to flush respect information to disk.
1804 * @param cls closure, not used
1805 * @param tc task context, not used
1808 cron_flush_respect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1813 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &flush_respect, NULL);
1816 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1818 GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
1819 GNUNET_SCHEDULER_PRIORITY_HIGH,
1820 &cron_flush_respect, NULL);
1825 * Initialize peer management subsystem.
1828 GSF_connected_peer_init_ ()
1830 cp_map = GNUNET_CONTAINER_multihashmap_create (128, GNUNET_YES);
1831 ats = GNUNET_ATS_performance_init (GSF_cfg, NULL, NULL);
1832 GNUNET_assert (GNUNET_OK ==
1833 GNUNET_CONFIGURATION_get_value_filename (GSF_cfg, "fs",
1835 &respectDirectory));
1836 GNUNET_DISK_directory_create (respectDirectory);
1837 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1838 &cron_flush_respect, NULL);
1843 * Iterator to free peer entries.
1845 * @param cls closure, unused
1846 * @param key current key code
1847 * @param value value in the hash map (peer entry)
1848 * @return GNUNET_YES (we should continue to iterate)
1851 clean_peer (void *cls, const struct GNUNET_HashCode * key, void *value)
1853 GSF_peer_disconnect_handler_ (NULL, (const struct GNUNET_PeerIdentity *) key);
1859 * Shutdown peer management subsystem.
1862 GSF_connected_peer_done_ ()
1864 cron_flush_respect (NULL, NULL);
1865 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &clean_peer, NULL);
1866 GNUNET_CONTAINER_multihashmap_destroy (cp_map);
1868 GNUNET_free (respectDirectory);
1869 respectDirectory = NULL;
1870 GNUNET_ATS_performance_done (ats);
1876 * Iterator to remove references to LC entry.
1878 * @param cls the 'struct GSF_LocalClient*' to look for
1879 * @param key current key code
1880 * @param value value in the hash map (peer entry)
1881 * @return GNUNET_YES (we should continue to iterate)
1884 clean_local_client (void *cls, const struct GNUNET_HashCode * key, void *value)
1886 const struct GSF_LocalClient *lc = cls;
1887 struct GSF_ConnectedPeer *cp = value;
1890 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
1891 if (cp->ppd.last_client_replies[i] == lc)
1892 cp->ppd.last_client_replies[i] = NULL;
1898 * Notification that a local client disconnected. Clean up all of our
1899 * references to the given handle.
1901 * @param lc handle to the local client (henceforth invalid)
1904 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
1907 return; /* already cleaned up */
1908 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &clean_local_client,
1913 /* end of gnunet-service-fs_cp.c */