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-service-fs.h"
29 #include "gnunet-service-fs_cp.h"
30 #include "gnunet-service-fs_pe.h"
31 #include "gnunet-service-fs_pr.h"
32 #include "gnunet-service-fs_push.h"
35 * How often do we flush trust values to disk?
37 #define TRUST_FLUSH_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
40 * After how long do we discard a reply?
42 #define REPLY_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
46 * Handle to cancel a transmission request.
48 struct GSF_PeerTransmitHandle
52 * Kept in a doubly-linked list.
54 struct GSF_PeerTransmitHandle *next;
57 * Kept in a doubly-linked list.
59 struct GSF_PeerTransmitHandle *prev;
62 * Handle for an active request for transmission to this
63 * peer, or NULL (if core queue was full).
65 struct GNUNET_CORE_TransmitHandle *cth;
68 * Time when this transmission request was issued.
70 struct GNUNET_TIME_Absolute transmission_request_start_time;
73 * Timeout for this request.
75 struct GNUNET_TIME_Absolute timeout;
78 * Task called on timeout, or 0 for none.
80 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
83 * Function to call to get the actual message.
85 GSF_GetMessageCallback gmc;
88 * Peer this request targets.
90 struct GSF_ConnectedPeer *cp;
98 * Size of the message to be transmitted.
103 * Set to 1 if we're currently in the process of calling
104 * 'GNUNET_CORE_notify_transmit_ready' (so while cth is
105 * NULL, we should not call notify_transmit_ready for this
108 unsigned int cth_in_progress;
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_CORE_peer_change_preference call (or NULL).
245 struct GNUNET_CORE_InformationRequestContext *irc;
248 * Task scheduled if we need to retry bandwidth reservation later.
250 GNUNET_SCHEDULER_TaskIdentifier irc_delay_task;
253 * Active requests from this neighbour, map of query to 'struct PeerRequest'.
255 struct GNUNET_CONTAINER_MultiHashMap *request_map;
258 * Increase in traffic preference still to be submitted
259 * to the core service for this peer.
261 uint64_t inc_preference;
264 * Trust rating for this peer on disk.
269 * Which offset in "last_p2p_replies" will be updated next?
270 * (we go round-robin).
272 unsigned int last_p2p_replies_woff;
275 * Which offset in "last_client_replies" will be updated next?
276 * (we go round-robin).
278 unsigned int last_client_replies_woff;
281 * Current offset into 'last_request_times' ring buffer.
283 unsigned int last_request_times_off;
286 * GNUNET_YES if we did successfully reserve 32k bandwidth,
295 * Map from peer identities to 'struct GSF_ConnectPeer' entries.
297 static struct GNUNET_CONTAINER_MultiHashMap *cp_map;
300 * Where do we store trust information?
302 static char *trustDirectory;
306 * Get the filename under which we would store the GNUNET_HELLO_Message
307 * for the given host and protocol.
308 * @return filename of the form DIRECTORY/HOSTID
311 get_trust_filename (const struct GNUNET_PeerIdentity *id)
313 struct GNUNET_CRYPTO_HashAsciiEncoded fil;
316 GNUNET_CRYPTO_hash_to_enc (&id->hashPubKey, &fil);
317 GNUNET_asprintf (&fn, "%s%s%s", trustDirectory, DIR_SEPARATOR_STR, &fil);
323 * Find latency information in 'atsi'.
325 * @param atsi performance data
326 * @return connection latency
328 static struct GNUNET_TIME_Relative
329 get_latency (const struct GNUNET_TRANSPORT_ATS_Information *atsi)
332 return GNUNET_TIME_UNIT_SECONDS;
333 while ((ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR) &&
334 (ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY))
336 if (ntohl (atsi->type) == GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR)
338 /* We sometime have no latency data, i.e. if the address came from
339 peerinfo and we never had a chance to play transport-level
340 PING/PONG yet. Assume 1s in that case. */
341 return GNUNET_TIME_UNIT_SECONDS;
343 return GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
344 ntohl (atsi->value));
349 * Update the performance information kept for the given peer.
351 * @param cp peer record to update
352 * @param atsi transport performance data
355 update_atsi (struct GSF_ConnectedPeer *cp,
356 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
358 struct GNUNET_TIME_Relative latency;
360 latency = get_latency (atsi);
361 GNUNET_LOAD_value_set_decline (cp->ppd.transmission_delay, latency);
362 /* LATER: merge atsi into cp's performance data (if we ever care...) */
367 * Return the performance data record for the given peer
369 * @param cp peer to query
370 * @return performance data record for the peer
372 struct GSF_PeerPerformanceData *
373 GSF_get_peer_performance_data_ (struct GSF_ConnectedPeer *cp)
380 * Core is ready to transmit to a peer, get the message.
382 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
383 * @param size number of bytes core is willing to take
384 * @param buf where to copy the message
385 * @return number of bytes copied to buf
388 peer_transmit_ready_cb (void *cls, size_t size, void *buf);
392 * Function called by core upon success or failure of our bandwidth reservation request.
394 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
395 * @param peer identifies the peer
396 * @param amount set to the amount that was actually reserved or unreserved;
397 * either the full requested amount or zero (no partial reservations)
398 * @param res_delay if the reservation could not be satisfied (amount was 0), how
399 * long should the client wait until re-trying?
402 core_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
403 int32_t amount, struct GNUNET_TIME_Relative res_delay);
407 * If ready (bandwidth reserved), try to schedule transmission via
408 * core for the given handle.
410 * @param pth transmission handle to schedule
413 schedule_transmission (struct GSF_PeerTransmitHandle *pth)
415 struct GSF_ConnectedPeer *cp;
416 struct GNUNET_PeerIdentity target;
419 if ((NULL != pth->cth) || (0 != pth->cth_in_progress))
420 return; /* already done */
422 GNUNET_assert (0 != cp->ppd.pid);
423 GNUNET_PEER_resolve (cp->ppd.pid, &target);
424 if ((GNUNET_YES == pth->is_query) && (GNUNET_YES != pth->was_reserved))
426 /* query, need reservation */
427 if (GNUNET_YES != cp->did_reserve)
428 return; /* not ready */
429 cp->did_reserve = GNUNET_NO;
430 /* reservation already done! */
431 pth->was_reserved = GNUNET_YES;
432 ip = cp->inc_preference;
433 cp->inc_preference = 0;
435 GNUNET_CORE_peer_change_preference (GSF_core, &target,
437 &core_reserve_callback, cp);
439 GNUNET_assert (pth->cth == NULL);
440 pth->cth_in_progress++;
442 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES, pth->priority,
443 GNUNET_TIME_absolute_get_remaining
444 (pth->timeout), &target, pth->size,
445 &peer_transmit_ready_cb, pth);
446 GNUNET_assert (0 < pth->cth_in_progress--);
451 * Core is ready to transmit to a peer, get the message.
453 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
454 * @param size number of bytes core is willing to take
455 * @param buf where to copy the message
456 * @return number of bytes copied to buf
459 peer_transmit_ready_cb (void *cls, size_t size, void *buf)
461 struct GSF_PeerTransmitHandle *pth = cls;
462 struct GSF_PeerTransmitHandle *pos;
463 struct GSF_ConnectedPeer *cp;
466 GNUNET_assert ((NULL == buf) || (pth->size <= size));
468 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
470 GNUNET_SCHEDULER_cancel (pth->timeout_task);
471 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
474 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
475 if (GNUNET_YES == pth->is_query)
477 cp->ppd.last_request_times[(cp->last_request_times_off++) %
478 MAX_QUEUE_PER_PEER] =
479 GNUNET_TIME_absolute_get ();
480 GNUNET_assert (0 < cp->ppd.pending_queries--);
482 else if (GNUNET_NO == pth->is_query)
484 GNUNET_assert (0 < cp->ppd.pending_replies--);
486 GNUNET_LOAD_update (cp->ppd.transmission_delay,
487 GNUNET_TIME_absolute_get_duration
488 (pth->transmission_request_start_time).rel_value);
489 ret = pth->gmc (pth->gmc_cls, size, buf);
490 GNUNET_assert (NULL == pth->cth);
491 for (pos = cp->pth_head; pos != NULL; pos = pos->next)
493 GNUNET_assert (pos != pth);
494 schedule_transmission (pos);
496 GNUNET_assert (pth->cth == NULL);
497 GNUNET_assert (pth->cth_in_progress == 0);
504 * (re)try to reserve bandwidth from the given peer.
506 * @param cls the 'struct GSF_ConnectedPeer' to reserve from
507 * @param tc scheduler context
510 retry_reservation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
512 struct GSF_ConnectedPeer *cp = cls;
514 struct GNUNET_PeerIdentity target;
516 GNUNET_PEER_resolve (cp->ppd.pid, &target);
517 cp->irc_delay_task = GNUNET_SCHEDULER_NO_TASK;
518 ip = cp->inc_preference;
519 cp->inc_preference = 0;
521 GNUNET_CORE_peer_change_preference (GSF_core, &target,
523 &core_reserve_callback, cp);
528 * Function called by core upon success or failure of our bandwidth reservation request.
530 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
531 * @param peer identifies the peer
532 * @param amount set to the amount that was actually reserved or unreserved;
533 * either the full requested amount or zero (no partial reservations)
534 * @param res_delay if the reservation could not be satisfied (amount was 0), how
535 * long should the client wait until re-trying?
538 core_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
539 int32_t amount, struct GNUNET_TIME_Relative res_delay)
541 struct GSF_ConnectedPeer *cp = cls;
542 struct GSF_PeerTransmitHandle *pth;
548 GNUNET_SCHEDULER_add_delayed (res_delay, &retry_reservation, cp);
551 cp->did_reserve = GNUNET_YES;
553 if ((NULL != pth) && (NULL == pth->cth))
555 /* reservation success, try transmission now! */
556 pth->cth_in_progress++;
558 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES, pth->priority,
559 GNUNET_TIME_absolute_get_remaining
560 (pth->timeout), peer, pth->size,
561 &peer_transmit_ready_cb, pth);
562 GNUNET_assert (0 < pth->cth_in_progress--);
568 * A peer connected to us. Setup the connected peer
571 * @param peer identity of peer that connected
572 * @param atsi performance data for the connection
573 * @return handle to connected peer entry
575 struct GSF_ConnectedPeer *
576 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
577 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
579 struct GSF_ConnectedPeer *cp;
583 cp = GNUNET_malloc (sizeof (struct GSF_ConnectedPeer));
584 cp->ppd.pid = GNUNET_PEER_intern (peer);
585 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
587 GNUNET_CORE_peer_change_preference (GSF_core, peer,
589 &core_reserve_callback, cp);
590 fn = get_trust_filename (peer);
591 if ((GNUNET_DISK_file_test (fn) == GNUNET_YES) &&
592 (sizeof (trust) == GNUNET_DISK_fn_read (fn, &trust, sizeof (trust))))
593 cp->disk_trust = cp->ppd.trust = ntohl (trust);
595 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128);
596 GNUNET_break (GNUNET_OK ==
597 GNUNET_CONTAINER_multihashmap_put (cp_map, &peer->hashPubKey,
599 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
600 update_atsi (cp, atsi);
601 GSF_push_start_ (cp);
607 * It may be time to re-start migrating content to this
608 * peer. Check, and if so, restart migration.
610 * @param cls the 'struct GSF_ConnectedPeer'
611 * @param tc scheduler context
614 revive_migration (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
616 struct GSF_ConnectedPeer *cp = cls;
617 struct GNUNET_TIME_Relative bt;
619 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
620 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
621 if (0 != bt.rel_value)
623 /* still time left... */
624 cp->mig_revive_task =
625 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
628 GSF_push_start_ (cp);
633 * Get a handle for a connected peer.
635 * @param peer peer's identity
636 * @return NULL if the peer is not currently connected
638 struct GSF_ConnectedPeer *
639 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
643 return GNUNET_CONTAINER_multihashmap_get (cp_map, &peer->hashPubKey);
648 * Handle P2P "MIGRATION_STOP" message.
650 * @param cls closure, always NULL
651 * @param other the other peer involved (sender or receiver, NULL
652 * for loopback messages where we are both sender and receiver)
653 * @param message the actual message
654 * @param atsi performance information
655 * @return GNUNET_OK to keep the connection open,
656 * GNUNET_SYSERR to close it (signal serious error)
659 GSF_handle_p2p_migration_stop_ (void *cls,
660 const struct GNUNET_PeerIdentity *other,
661 const struct GNUNET_MessageHeader *message,
662 const struct GNUNET_TRANSPORT_ATS_Information
665 struct GSF_ConnectedPeer *cp;
666 const struct MigrationStopMessage *msm;
667 struct GNUNET_TIME_Relative bt;
669 msm = (const struct MigrationStopMessage *) message;
670 cp = GNUNET_CONTAINER_multihashmap_get (cp_map, &other->hashPubKey);
676 bt = GNUNET_TIME_relative_ntoh (msm->duration);
677 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
678 _("Migration of content to peer `%s' blocked for %llu ms\n"),
679 GNUNET_i2s (other), (unsigned long long) bt.rel_value);
680 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
681 if (cp->mig_revive_task == GNUNET_SCHEDULER_NO_TASK)
684 cp->mig_revive_task =
685 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
687 update_atsi (cp, atsi);
693 * Copy reply and free put message.
695 * @param cls the 'struct PutMessage'
696 * @param buf_size number of bytes available in buf
697 * @param buf where to copy the message, NULL on error (peer disconnect)
698 * @return number of bytes copied to 'buf', can be 0 (without indicating an error)
701 copy_reply (void *cls, size_t buf_size, void *buf)
703 struct PutMessage *pm = cls;
708 GNUNET_assert (buf_size >= ntohs (pm->header.size));
709 size = ntohs (pm->header.size);
710 memcpy (buf, pm, size);
711 GNUNET_STATISTICS_update (GSF_stats,
713 ("# replies transmitted to other peers"), 1,
719 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# replies dropped"), 1,
728 * Cancel all requests associated with the peer.
731 * @param query hash code of the request
732 * @param value the 'struct GSF_PendingRequest'
733 * @return GNUNET_YES (continue to iterate)
736 cancel_pending_request (void *cls, const GNUNET_HashCode * query, void *value)
738 struct PeerRequest *peerreq = value;
739 struct GSF_PendingRequest *pr = peerreq->pr;
740 struct GSF_ConnectedPeer *cp = peerreq->cp;
741 struct GSF_PendingRequestData *prd;
743 if (peerreq->kill_task != GNUNET_SCHEDULER_NO_TASK)
745 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
746 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
748 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
750 prd = GSF_pending_request_get_data_ (pr);
751 GNUNET_break (GNUNET_YES ==
752 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
753 &prd->query, peerreq));
754 GSF_pending_request_cancel_ (pr, GNUNET_NO);
755 GNUNET_free (peerreq);
761 * Free the given request.
763 * @param cls the request to free
764 * @param tc task context
767 peer_request_destroy (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
769 struct PeerRequest *peerreq = cls;
770 struct GSF_PendingRequest *pr = peerreq->pr;
771 struct GSF_PendingRequestData *prd;
773 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
774 prd = GSF_pending_request_get_data_ (pr);
775 cancel_pending_request (NULL, &prd->query, peerreq);
780 * The artificial delay is over, transmit the message now.
782 * @param cls the 'struct GSF_DelayedHandle' with the message
783 * @param tc scheduler context
786 transmit_delayed_now (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
788 struct GSF_DelayedHandle *dh = cls;
789 struct GSF_ConnectedPeer *cp = dh->cp;
791 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
792 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
794 GNUNET_free (dh->pm);
798 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT,
799 dh->msize, ©_reply, dh->pm);
805 * Get the randomized delay a response should be subjected to.
807 * @return desired delay
809 static struct GNUNET_TIME_Relative
810 get_randomized_delay ()
812 struct GNUNET_TIME_Relative ret;
814 /* FIXME: replace 5000 with something relating to current observed P2P message latency */
816 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
817 GNUNET_CRYPTO_random_u32
818 (GNUNET_CRYPTO_QUALITY_WEAK, 5000));
819 GNUNET_STATISTICS_update (GSF_stats,
821 ("# artificial delays introduced (ms)"),
822 ret.rel_value, GNUNET_NO);
829 * Handle a reply to a pending request. Also called if a request
830 * expires (then with data == NULL). The handler may be called
831 * many times (depending on the request type), but will not be
832 * called during or after a call to GSF_pending_request_cancel
833 * and will also not be called anymore after a call signalling
836 * @param cls 'struct PeerRequest' this is an answer for
837 * @param eval evaluation of the result
838 * @param pr handle to the original pending request
839 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
840 * @param expiration when does 'data' expire?
841 * @param type type of the block
842 * @param data response data, NULL on request expiration
843 * @param data_len number of bytes in data
846 handle_p2p_reply (void *cls, enum GNUNET_BLOCK_EvaluationResult eval,
847 struct GSF_PendingRequest *pr, uint32_t reply_anonymity_level,
848 struct GNUNET_TIME_Absolute expiration,
849 enum GNUNET_BLOCK_Type type, const void *data,
852 struct PeerRequest *peerreq = cls;
853 struct GSF_ConnectedPeer *cp = peerreq->cp;
854 struct GSF_PendingRequestData *prd;
855 struct PutMessage *pm;
858 GNUNET_assert (data_len + sizeof (struct PutMessage) <
859 GNUNET_SERVER_MAX_MESSAGE_SIZE);
860 GNUNET_assert (peerreq->pr == pr);
861 prd = GSF_pending_request_get_data_ (pr);
864 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
866 GNUNET_break (GNUNET_YES ==
867 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
868 &prd->query, peerreq));
869 GNUNET_free (peerreq);
872 GNUNET_break (type != GNUNET_BLOCK_TYPE_ANY);
873 if ((prd->type != type) && (prd->type != GNUNET_BLOCK_TYPE_ANY))
879 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
880 "Transmitting result for query `%s' to peer\n",
881 GNUNET_h2s (&prd->query));
883 GNUNET_STATISTICS_update (GSF_stats,
884 gettext_noop ("# replies received for other peers"),
886 msize = sizeof (struct PutMessage) + data_len;
887 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
892 if ((reply_anonymity_level != UINT32_MAX) && (reply_anonymity_level > 1))
894 if (reply_anonymity_level - 1 > GSF_cover_content_count)
896 GNUNET_STATISTICS_update (GSF_stats,
898 ("# replies dropped due to insufficient cover traffic"),
902 GSF_cover_content_count -= (reply_anonymity_level - 1);
905 pm = GNUNET_malloc (msize);
906 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
907 pm->header.size = htons (msize);
908 pm->type = htonl (type);
909 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
910 memcpy (&pm[1], data, data_len);
911 if ((reply_anonymity_level != UINT32_MAX) && (reply_anonymity_level != 0) &&
912 (GSF_enable_randomized_delays == GNUNET_YES))
914 struct GSF_DelayedHandle *dh;
916 dh = GNUNET_malloc (sizeof (struct GSF_DelayedHandle));
920 GNUNET_CONTAINER_DLL_insert (cp->delayed_head, cp->delayed_tail, dh);
922 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
923 &transmit_delayed_now, dh);
927 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT, msize,
930 if (eval != GNUNET_BLOCK_EVALUATION_OK_LAST)
932 if (GNUNET_SCHEDULER_NO_TASK == peerreq->kill_task)
934 GNUNET_STATISTICS_update (GSF_stats,
936 ("# P2P searches destroyed due to ultimate reply"),
939 GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
945 * Increase the host credit by a value.
947 * @param cp which peer to change the trust value on
948 * @param value is the int value by which the
949 * host credit is to be increased or decreased
950 * @returns the actual change in trust (positive or negative)
953 change_host_trust (struct GSF_ConnectedPeer *cp, int value)
957 GNUNET_assert (cp != NULL);
960 if (cp->ppd.trust + value < cp->ppd.trust)
962 value = UINT32_MAX - cp->ppd.trust;
963 cp->ppd.trust = UINT32_MAX;
966 cp->ppd.trust += value;
970 if (cp->ppd.trust < -value)
972 value = -cp->ppd.trust;
976 cp->ppd.trust += value;
983 * We've received a request with the specified priority. Bound it
984 * according to how much we trust the given peer.
986 * @param prio_in requested priority
987 * @param cp the peer making the request
988 * @return effective priority
991 bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
993 #define N ((double)128.0)
998 ld = GSF_test_get_load_too_high_ (0);
999 if (ld == GNUNET_SYSERR)
1001 GNUNET_STATISTICS_update (GSF_stats,
1003 ("# requests done for free (low load)"), 1,
1005 return 0; /* excess resources */
1007 if (prio_in > INT32_MAX)
1008 prio_in = INT32_MAX;
1009 ret = -change_host_trust (cp, -(int) prio_in);
1012 if (ret > GSF_current_priorities + N)
1013 rret = GSF_current_priorities + N;
1016 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1018 if ((ld == GNUNET_YES) && (ret > 0))
1020 /* try with charging */
1021 ld = GSF_test_get_load_too_high_ (ret);
1023 if (ld == GNUNET_YES)
1025 GNUNET_STATISTICS_update (GSF_stats,
1027 ("# request dropped, priority insufficient"), 1,
1030 change_host_trust (cp, (int) ret);
1031 return -1; /* not enough resources */
1035 GNUNET_STATISTICS_update (GSF_stats,
1037 ("# requests done for a price (normal load)"), 1,
1046 * The priority level imposes a bound on the maximum
1047 * value for the ttl that can be requested.
1049 * @param ttl_in requested ttl
1050 * @param prio given priority
1051 * @return ttl_in if ttl_in is below the limit,
1052 * otherwise the ttl-limit for the given priority
1055 bound_ttl (int32_t ttl_in, uint32_t prio)
1057 unsigned long long allowed;
1061 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1062 if (ttl_in > allowed)
1064 if (allowed >= (1 << 30))
1073 * Handle P2P "QUERY" message. Creates the pending request entry
1074 * and sets up all of the data structures to that we will
1075 * process replies properly. Does not initiate forwarding or
1076 * local database lookups.
1078 * @param other the other peer involved (sender or receiver, NULL
1079 * for loopback messages where we are both sender and receiver)
1080 * @param message the actual message
1081 * @return pending request handle, NULL on error
1083 struct GSF_PendingRequest *
1084 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1085 const struct GNUNET_MessageHeader *message)
1087 struct PeerRequest *peerreq;
1088 struct GSF_PendingRequest *pr;
1089 struct GSF_PendingRequestData *prd;
1090 struct GSF_ConnectedPeer *cp;
1091 struct GSF_ConnectedPeer *cps;
1092 const GNUNET_HashCode *namespace;
1093 const struct GNUNET_PeerIdentity *target;
1094 enum GSF_PendingRequestOptions options;
1096 const struct GetMessage *gm;
1098 const GNUNET_HashCode *opt;
1101 uint32_t ttl_decrement;
1104 enum GNUNET_BLOCK_Type type;
1105 GNUNET_PEER_Id spid;
1107 GNUNET_assert (other != NULL);
1108 msize = ntohs (message->size);
1109 if (msize < sizeof (struct GetMessage))
1111 GNUNET_break_op (0);
1114 GNUNET_STATISTICS_update (GSF_stats,
1116 ("# GET requests received (from other peers)"), 1,
1118 gm = (const struct GetMessage *) message;
1119 type = ntohl (gm->type);
1120 bm = ntohl (gm->hash_bitmap);
1128 if (msize < sizeof (struct GetMessage) + bits * sizeof (GNUNET_HashCode))
1130 GNUNET_break_op (0);
1133 opt = (const GNUNET_HashCode *) &gm[1];
1134 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (GNUNET_HashCode);
1135 /* bfsize must be power of 2, check! */
1136 if (0 != ((bfsize - 1) & bfsize))
1138 GNUNET_break_op (0);
1141 GSF_cover_query_count++;
1142 bm = ntohl (gm->hash_bitmap);
1144 cps = GNUNET_CONTAINER_multihashmap_get (cp_map, &other->hashPubKey);
1147 /* peer must have just disconnected */
1148 GNUNET_STATISTICS_update (GSF_stats,
1150 ("# requests dropped due to initiator not being connected"),
1154 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1155 cp = GNUNET_CONTAINER_multihashmap_get (cp_map, &opt[bits++]);
1161 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1162 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1163 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
1164 GNUNET_i2s ((const struct GNUNET_PeerIdentity *)
1168 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1169 "Failed to find peer `%4s' in connection set. Dropping query.\n",
1170 GNUNET_i2s (other));
1172 GNUNET_STATISTICS_update (GSF_stats,
1174 ("# requests dropped due to missing reverse route"),
1178 /* note that we can really only check load here since otherwise
1179 * peers could find out that we are overloaded by not being
1180 * disconnected after sending us a malformed query... */
1181 priority = bound_priority (ntohl (gm->priority), cps);
1185 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1186 "Dropping query from `%s', this peer is too busy.\n",
1187 GNUNET_i2s (other));
1192 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1193 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
1194 GNUNET_h2s (&gm->query), (unsigned int) type, GNUNET_i2s (other),
1197 namespace = (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE)) ? &opt[bits++] : NULL;
1198 if ((type == GNUNET_BLOCK_TYPE_FS_SBLOCK) && (namespace == NULL))
1200 GNUNET_break_op (0);
1203 if ((type != GNUNET_BLOCK_TYPE_FS_SBLOCK) && (namespace != NULL))
1205 GNUNET_break_op (0);
1210 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? ((const struct GNUNET_PeerIdentity
1211 *) &opt[bits++]) : NULL;
1214 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
1215 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1216 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value * 2 +
1217 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1219 /* don't have BW to send to peer, or would likely take longer than we have for it,
1220 * so at best indirect the query */
1222 options |= GSF_PRO_FORWARD_ONLY;
1223 spid = GNUNET_PEER_intern (other);
1224 GNUNET_assert (0 != spid);
1226 ttl = bound_ttl (ntohl (gm->ttl), priority);
1227 /* decrement ttl (always) */
1229 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1231 if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
1234 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1235 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1236 GNUNET_i2s (other), ttl, ttl_decrement);
1238 GNUNET_STATISTICS_update (GSF_stats,
1240 ("# requests dropped due TTL underflow"), 1,
1242 /* integer underflow => drop (should be very rare)! */
1245 ttl -= ttl_decrement;
1247 /* test if the request already exists */
1248 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map, &gm->query);
1249 if (peerreq != NULL)
1252 prd = GSF_pending_request_get_data_ (pr);
1253 if ((prd->type == type) &&
1254 ((type != GNUNET_BLOCK_TYPE_FS_SBLOCK) ||
1255 (0 == memcmp (&prd->namespace, namespace, sizeof (GNUNET_HashCode)))))
1257 if (prd->ttl.abs_value >= GNUNET_TIME_absolute_get ().abs_value + ttl)
1259 /* existing request has higher TTL, drop new one! */
1260 prd->priority += priority;
1262 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1263 "Have existing request with higher TTL, dropping new request.\n",
1264 GNUNET_i2s (other));
1266 GNUNET_STATISTICS_update (GSF_stats,
1268 ("# requests dropped due to higher-TTL request"),
1272 /* existing request has lower TTL, drop old one! */
1273 GNUNET_STATISTICS_update (GSF_stats,
1274 gettext_noop ("# P2P searches active"), -1,
1276 priority += prd->priority;
1277 GSF_pending_request_cancel_ (pr, GNUNET_YES);
1278 GNUNET_assert (GNUNET_YES ==
1279 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
1282 if (peerreq->kill_task != GNUNET_SCHEDULER_NO_TASK)
1284 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
1285 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
1287 GNUNET_free (peerreq);
1291 peerreq = GNUNET_malloc (sizeof (struct PeerRequest));
1293 pr = GSF_pending_request_create_ (options, type, &gm->query, namespace,
1296 0) ? (const char *) &opt[bits] : NULL,
1297 bfsize, ntohl (gm->filter_mutator),
1299 (uint32_t) priority, ttl, spid, NULL, 0, /* replies_seen */
1300 &handle_p2p_reply, peerreq);
1301 GNUNET_assert (NULL != pr);
1303 GNUNET_break (GNUNET_OK ==
1304 GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
1306 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1307 GNUNET_STATISTICS_update (GSF_stats,
1309 ("# P2P query messages received and processed"), 1,
1311 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
1318 * Function called if there has been a timeout trying to satisfy
1319 * a transmission request.
1321 * @param cls the 'struct GSF_PeerTransmitHandle' of the request
1322 * @param tc scheduler context
1325 peer_transmit_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1327 struct GSF_PeerTransmitHandle *pth = cls;
1328 struct GSF_ConnectedPeer *cp;
1331 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1332 "Timeout trying to transmit to other peer\n");
1334 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1336 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1337 if (GNUNET_YES == pth->is_query)
1338 GNUNET_assert (0 < cp->ppd.pending_queries--);
1339 else if (GNUNET_NO == pth->is_query)
1340 GNUNET_assert (0 < cp->ppd.pending_replies--);
1341 GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
1342 if (NULL != pth->cth)
1344 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1347 pth->gmc (pth->gmc_cls, 0, NULL);
1348 GNUNET_assert (0 == pth->cth_in_progress);
1354 * Transmit a message to the given peer as soon as possible.
1355 * If the peer disconnects before the transmission can happen,
1356 * the callback is invoked with a 'NULL' buffer.
1358 * @param cp target peer
1359 * @param is_query is this a query (GNUNET_YES) or content (GNUNET_NO) or neither (GNUNET_SYSERR)
1360 * @param priority how important is this request?
1361 * @param timeout when does this request timeout (call gmc with error)
1362 * @param size number of bytes we would like to send to the peer
1363 * @param gmc function to call to get the message
1364 * @param gmc_cls closure for gmc
1365 * @return handle to cancel request
1367 struct GSF_PeerTransmitHandle *
1368 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp, int is_query,
1369 uint32_t priority, struct GNUNET_TIME_Relative timeout,
1370 size_t size, GSF_GetMessageCallback gmc, void *gmc_cls)
1372 struct GSF_PeerTransmitHandle *pth;
1373 struct GSF_PeerTransmitHandle *pos;
1374 struct GSF_PeerTransmitHandle *prev;
1376 pth = GNUNET_malloc (sizeof (struct GSF_PeerTransmitHandle));
1377 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1378 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1380 pth->gmc_cls = gmc_cls;
1382 pth->is_query = is_query;
1383 pth->priority = priority;
1385 /* insertion sort (by priority, descending) */
1388 while ((pos != NULL) && (pos->priority > priority))
1394 GNUNET_CONTAINER_DLL_insert (cp->pth_head, cp->pth_tail, pth);
1396 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head, cp->pth_tail, prev, pth);
1397 if (GNUNET_YES == is_query)
1398 cp->ppd.pending_queries++;
1399 else if (GNUNET_NO == is_query)
1400 cp->ppd.pending_replies++;
1402 GNUNET_SCHEDULER_add_delayed (timeout, &peer_transmit_timeout, pth);
1403 schedule_transmission (pth);
1409 * Cancel an earlier request for transmission.
1411 * @param pth request to cancel
1414 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1416 struct GSF_ConnectedPeer *cp;
1418 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1420 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1421 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1423 if (NULL != pth->cth)
1425 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1429 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1430 if (GNUNET_YES == pth->is_query)
1431 GNUNET_assert (0 < cp->ppd.pending_queries--);
1432 else if (GNUNET_NO == pth->is_query)
1433 GNUNET_assert (0 < cp->ppd.pending_replies--);
1434 GNUNET_assert (0 == pth->cth_in_progress);
1440 * Report on receiving a reply; update the performance record of the given peer.
1442 * @param cp responding peer (will be updated)
1443 * @param request_time time at which the original query was transmitted
1444 * @param request_priority priority of the original request
1447 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1448 struct GNUNET_TIME_Absolute request_time,
1449 uint32_t request_priority)
1451 struct GNUNET_TIME_Relative delay;
1453 delay = GNUNET_TIME_absolute_get_duration (request_time);
1454 cp->ppd.avg_reply_delay.rel_value =
1455 (cp->ppd.avg_reply_delay.rel_value * (RUNAVG_DELAY_N - 1) +
1456 delay.rel_value) / RUNAVG_DELAY_N;
1457 cp->ppd.avg_priority =
1458 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1459 request_priority) / RUNAVG_DELAY_N;
1464 * Report on receiving a reply in response to an initiating client.
1465 * Remember that this peer is good for this client.
1467 * @param cp responding peer (will be updated)
1468 * @param initiator_client local client on responsible for query
1471 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1472 struct GSF_LocalClient *initiator_client)
1474 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1475 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1480 * Report on receiving a reply in response to an initiating peer.
1481 * Remember that this peer is good for this initiating peer.
1483 * @param cp responding peer (will be updated)
1484 * @param initiator_peer other peer responsible for query
1487 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1488 const struct GSF_ConnectedPeer *initiator_peer)
1492 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1493 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1494 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1495 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1496 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1501 * Method called whenever a given peer has a status change.
1503 * @param cls closure
1504 * @param peer peer identity this notification is about
1505 * @param bandwidth_in available amount of inbound bandwidth
1506 * @param bandwidth_out available amount of outbound bandwidth
1507 * @param timeout absolute time when this peer will time out
1508 * unless we see some further activity from it
1509 * @param atsi status information
1512 GSF_peer_status_handler_ (void *cls, const struct GNUNET_PeerIdentity *peer,
1513 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
1514 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
1515 struct GNUNET_TIME_Absolute timeout,
1516 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1518 struct GSF_ConnectedPeer *cp;
1520 cp = GNUNET_CONTAINER_multihashmap_get (cp_map, &peer->hashPubKey);
1521 GNUNET_assert (NULL != cp);
1522 update_atsi (cp, atsi);
1527 * A peer disconnected from us. Tear down the connected peer
1531 * @param peer identity of peer that connected
1534 GSF_peer_disconnect_handler_ (void *cls, const struct GNUNET_PeerIdentity *peer)
1536 struct GSF_ConnectedPeer *cp;
1537 struct GSF_PeerTransmitHandle *pth;
1538 struct GSF_DelayedHandle *dh;
1540 cp = GNUNET_CONTAINER_multihashmap_get (cp_map, &peer->hashPubKey);
1542 return; /* must have been disconnect from core with
1543 * 'peer' == my_id, ignore */
1544 GNUNET_assert (GNUNET_YES ==
1545 GNUNET_CONTAINER_multihashmap_remove (cp_map,
1546 &peer->hashPubKey, cp));
1547 if (NULL != cp->migration_pth)
1549 GSF_peer_transmit_cancel_ (cp->migration_pth);
1550 cp->migration_pth = NULL;
1552 if (NULL != cp->irc)
1554 GNUNET_CORE_peer_change_preference_cancel (cp->irc);
1557 if (GNUNET_SCHEDULER_NO_TASK != cp->irc_delay_task)
1559 GNUNET_SCHEDULER_cancel (cp->irc_delay_task);
1560 cp->irc_delay_task = GNUNET_SCHEDULER_NO_TASK;
1562 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1563 &cancel_pending_request, cp);
1564 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1565 cp->request_map = NULL;
1566 GSF_plan_notify_peer_disconnect_ (cp);
1567 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1568 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1569 memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
1570 GSF_push_stop_ (cp);
1571 while (NULL != (pth = cp->pth_head))
1573 if (NULL != pth->cth)
1575 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1578 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1580 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1581 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1583 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1584 GNUNET_assert (0 == pth->cth_in_progress);
1585 pth->gmc (pth->gmc_cls, 0, NULL);
1588 while (NULL != (dh = cp->delayed_head))
1590 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
1591 GNUNET_SCHEDULER_cancel (dh->delay_task);
1592 GNUNET_free (dh->pm);
1595 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1596 if (GNUNET_SCHEDULER_NO_TASK != cp->mig_revive_task)
1598 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1599 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
1606 * Closure for 'call_iterator'.
1608 struct IterationContext
1611 * Function to call on each entry.
1613 GSF_ConnectedPeerIterator it;
1623 * Function that calls the callback for each peer.
1625 * @param cls the 'struct IterationContext*'
1626 * @param key identity of the peer
1627 * @param value the 'struct GSF_ConnectedPeer*'
1628 * @return GNUNET_YES to continue iteration
1631 call_iterator (void *cls, const GNUNET_HashCode * key, void *value)
1633 struct IterationContext *ic = cls;
1634 struct GSF_ConnectedPeer *cp = value;
1636 ic->it (ic->it_cls, (const struct GNUNET_PeerIdentity *) key, cp, &cp->ppd);
1642 * Iterate over all connected peers.
1644 * @param it function to call for each peer
1645 * @param it_cls closure for it
1648 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it, void *it_cls)
1650 struct IterationContext ic;
1654 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &call_iterator, &ic);
1659 * Obtain the identity of a connected peer.
1661 * @param cp peer to reserve bandwidth from
1662 * @param id identity to set (written to)
1665 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1666 struct GNUNET_PeerIdentity *id)
1668 GNUNET_assert (0 != cp->ppd.pid);
1669 GNUNET_PEER_resolve (cp->ppd.pid, id);
1674 * Assemble a migration stop message for transmission.
1676 * @param cls the 'struct GSF_ConnectedPeer' to use
1677 * @param size number of bytes we're allowed to write to buf
1678 * @param buf where to copy the message
1679 * @return number of bytes copied to buf
1682 create_migration_stop_message (void *cls, size_t size, void *buf)
1684 struct GSF_ConnectedPeer *cp = cls;
1685 struct MigrationStopMessage msm;
1687 cp->migration_pth = NULL;
1690 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1691 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1692 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1693 msm.reserved = htonl (0);
1695 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1696 (cp->last_migration_block));
1697 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
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_Relative block_time)
1713 if (GNUNET_TIME_absolute_get_remaining (cp->last_migration_block).rel_value >
1714 block_time.rel_value)
1717 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1718 "Migration already blocked for another %llu ms\n",
1719 (unsigned long long)
1720 GNUNET_TIME_absolute_get_remaining
1721 (cp->last_migration_block).rel_value);
1723 return; /* already blocked */
1726 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %llu ms\n",
1727 (unsigned long long) block_time.rel_value);
1729 cp->last_migration_block = GNUNET_TIME_relative_to_absolute (block_time);
1730 if (cp->migration_pth != NULL)
1731 GSF_peer_transmit_cancel_ (cp->migration_pth);
1733 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1734 GNUNET_TIME_UNIT_FOREVER_REL,
1735 sizeof (struct MigrationStopMessage),
1736 &create_migration_stop_message, cp);
1741 * Write host-trust information to a file - flush the buffer entry!
1743 * @param cls closure, not used
1744 * @param key host identity
1745 * @param value the 'struct GSF_ConnectedPeer' to flush
1746 * @return GNUNET_OK to continue iteration
1749 flush_trust (void *cls, const GNUNET_HashCode * key, void *value)
1751 struct GSF_ConnectedPeer *cp = value;
1754 struct GNUNET_PeerIdentity pid;
1756 if (cp->ppd.trust == cp->disk_trust)
1757 return GNUNET_OK; /* unchanged */
1758 GNUNET_assert (0 != cp->ppd.pid);
1759 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1760 fn = get_trust_filename (&pid);
1761 if (cp->ppd.trust == 0)
1763 if ((0 != UNLINK (fn)) && (errno != ENOENT))
1764 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING |
1765 GNUNET_ERROR_TYPE_BULK, "unlink", fn);
1769 trust = htonl (cp->ppd.trust);
1770 if (sizeof (uint32_t) ==
1771 GNUNET_DISK_fn_write (fn, &trust, sizeof (uint32_t),
1772 GNUNET_DISK_PERM_USER_READ |
1773 GNUNET_DISK_PERM_USER_WRITE |
1774 GNUNET_DISK_PERM_GROUP_READ |
1775 GNUNET_DISK_PERM_OTHER_READ))
1776 cp->disk_trust = cp->ppd.trust;
1784 * Notify core about a preference we have for the given peer
1785 * (to allocate more resources towards it). The change will
1786 * be communicated the next time we reserve bandwidth with
1787 * core (not instantly).
1789 * @param cp peer to reserve bandwidth from
1790 * @param pref preference change
1793 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1796 cp->inc_preference += pref;
1801 * Call this method periodically to flush trust information to disk.
1803 * @param cls closure, not used
1804 * @param tc task context, not used
1807 cron_flush_trust (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1812 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &flush_trust, NULL);
1815 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1817 GNUNET_SCHEDULER_add_delayed (TRUST_FLUSH_FREQ, &cron_flush_trust, NULL);
1822 * Initialize peer management subsystem.
1825 GSF_connected_peer_init_ ()
1827 cp_map = GNUNET_CONTAINER_multihashmap_create (128);
1828 GNUNET_assert (GNUNET_OK ==
1829 GNUNET_CONFIGURATION_get_value_filename (GSF_cfg, "fs",
1832 GNUNET_DISK_directory_create (trustDirectory);
1833 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1834 &cron_flush_trust, NULL);
1839 * Iterator to free peer entries.
1841 * @param cls closure, unused
1842 * @param key current key code
1843 * @param value value in the hash map (peer entry)
1844 * @return GNUNET_YES (we should continue to iterate)
1847 clean_peer (void *cls, const GNUNET_HashCode * key, void *value)
1849 GSF_peer_disconnect_handler_ (NULL, (const struct GNUNET_PeerIdentity *) key);
1855 * Shutdown peer management subsystem.
1858 GSF_connected_peer_done_ ()
1860 cron_flush_trust (NULL, NULL);
1861 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &clean_peer, NULL);
1862 GNUNET_CONTAINER_multihashmap_destroy (cp_map);
1864 GNUNET_free (trustDirectory);
1865 trustDirectory = NULL;
1870 * Iterator to remove references to LC entry.
1872 * @param cls the 'struct GSF_LocalClient*' to look for
1873 * @param key current key code
1874 * @param value value in the hash map (peer entry)
1875 * @return GNUNET_YES (we should continue to iterate)
1878 clean_local_client (void *cls, const GNUNET_HashCode * key, void *value)
1880 const struct GSF_LocalClient *lc = cls;
1881 struct GSF_ConnectedPeer *cp = value;
1884 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
1885 if (cp->ppd.last_client_replies[i] == lc)
1886 cp->ppd.last_client_replies[i] = NULL;
1892 * Notification that a local client disconnected. Clean up all of our
1893 * references to the given handle.
1895 * @param lc handle to the local client (henceforth invalid)
1898 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
1901 return; /* already cleaned up */
1902 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &clean_local_client,
1907 /* end of gnunet-service-fs_cp.c */