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 trust values to disk?
46 #define TRUST_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 * Trust rating for this peer on disk.
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 trust information?
311 static char *trustDirectory;
314 * Handle to ATS service.
316 static struct GNUNET_ATS_PerformanceHandle *ats;
319 * Get the filename under which we would store the GNUNET_HELLO_Message
320 * for the given host and protocol.
321 * @return filename of the form DIRECTORY/HOSTID
324 get_trust_filename (const struct GNUNET_PeerIdentity *id)
326 struct GNUNET_CRYPTO_HashAsciiEncoded fil;
329 GNUNET_CRYPTO_hash_to_enc (&id->hashPubKey, &fil);
330 GNUNET_asprintf (&fn, "%s%s%s", trustDirectory, DIR_SEPARATOR_STR, &fil);
336 * Find latency information in 'atsi'.
338 * @param atsi performance data
339 * @param atsi_count number of records in 'atsi'
340 * @return connection latency
342 static struct GNUNET_TIME_Relative
343 get_latency (const struct GNUNET_ATS_Information *atsi, unsigned int atsi_count)
347 for (i = 0; i < atsi_count; i++)
348 if (ntohl (atsi->type) == GNUNET_ATS_QUALITY_NET_DELAY)
349 return GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
350 ntohl (atsi->value));
351 return GNUNET_TIME_UNIT_SECONDS;
356 * Update the performance information kept for the given peer.
358 * @param cp peer record to update
359 * @param atsi transport performance data
360 * @param atsi_count number of records in 'atsi'
363 update_atsi (struct GSF_ConnectedPeer *cp,
364 const struct GNUNET_ATS_Information *atsi, unsigned int atsi_count)
366 struct GNUNET_TIME_Relative latency;
368 latency = get_latency (atsi, atsi_count);
369 GNUNET_LOAD_value_set_decline (cp->ppd.transmission_delay, latency);
370 /* LATER: merge atsi into cp's performance data (if we ever care...) */
375 * Return the performance data record for the given peer
377 * @param cp peer to query
378 * @return performance data record for the peer
380 struct GSF_PeerPerformanceData *
381 GSF_get_peer_performance_data_ (struct GSF_ConnectedPeer *cp)
388 * Core is ready to transmit to a peer, get the message.
390 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
391 * @param size number of bytes core is willing to take
392 * @param buf where to copy the message
393 * @return number of bytes copied to buf
396 peer_transmit_ready_cb (void *cls, size_t size, void *buf);
400 * Function called by core upon success or failure of our bandwidth reservation request.
402 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
403 * @param peer identifies the peer
404 * @param amount set to the amount that was actually reserved or unreserved;
405 * either the full requested amount or zero (no partial reservations)
406 * @param res_delay if the reservation could not be satisfied (amount was 0), how
407 * long should the client wait until re-trying?
410 ats_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
411 int32_t amount, struct GNUNET_TIME_Relative res_delay);
415 * If ready (bandwidth reserved), try to schedule transmission via
416 * core for the given handle.
418 * @param pth transmission handle to schedule
421 schedule_transmission (struct GSF_PeerTransmitHandle *pth)
423 struct GSF_ConnectedPeer *cp;
424 struct GNUNET_PeerIdentity target;
427 if ((NULL != cp->cth) || (0 != cp->cth_in_progress))
428 return; /* already done */
429 GNUNET_assert (0 != cp->ppd.pid);
430 GNUNET_PEER_resolve (cp->ppd.pid, &target);
432 if (0 != cp->inc_preference)
434 GNUNET_ATS_change_preference (ats, &target, GNUNET_ATS_PREFERENCE_BANDWIDTH,
435 (double) cp->inc_preference,
436 GNUNET_ATS_PREFERENCE_END);
437 cp->inc_preference = 0;
440 if ((GNUNET_YES == pth->is_query) && (GNUNET_YES != pth->was_reserved))
442 /* query, need reservation */
443 if (GNUNET_YES != cp->did_reserve)
444 return; /* not ready */
445 cp->did_reserve = GNUNET_NO;
446 /* reservation already done! */
447 pth->was_reserved = GNUNET_YES;
449 GNUNET_ATS_reserve_bandwidth (ats, &target, DBLOCK_SIZE,
450 &ats_reserve_callback, cp);
453 GNUNET_assert (cp->cth == NULL);
454 cp->cth_in_progress++;
456 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES, pth->priority,
457 GNUNET_TIME_absolute_get_remaining
458 (pth->timeout), &target, pth->size,
459 &peer_transmit_ready_cb, cp);
460 GNUNET_assert (NULL != cp->cth);
461 GNUNET_assert (0 < cp->cth_in_progress--);
466 * Core is ready to transmit to a peer, get the message.
468 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
469 * @param size number of bytes core is willing to take
470 * @param buf where to copy the message
471 * @return number of bytes copied to buf
474 peer_transmit_ready_cb (void *cls, size_t size, void *buf)
476 struct GSF_ConnectedPeer *cp = cls;
477 struct GSF_PeerTransmitHandle *pth = cp->pth_head;
478 struct GSF_PeerTransmitHandle *pos;
484 if (pth->size > size)
486 schedule_transmission (pth);
489 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
491 GNUNET_SCHEDULER_cancel (pth->timeout_task);
492 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
494 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
495 if (GNUNET_YES == pth->is_query)
497 cp->ppd.last_request_times[(cp->last_request_times_off++) %
498 MAX_QUEUE_PER_PEER] =
499 GNUNET_TIME_absolute_get ();
500 GNUNET_assert (0 < cp->ppd.pending_queries--);
502 else if (GNUNET_NO == pth->is_query)
504 GNUNET_assert (0 < cp->ppd.pending_replies--);
506 GNUNET_LOAD_update (cp->ppd.transmission_delay,
507 GNUNET_TIME_absolute_get_duration
508 (pth->transmission_request_start_time).rel_value);
509 ret = pth->gmc (pth->gmc_cls, size, buf);
510 if (NULL != (pos = cp->pth_head))
512 GNUNET_assert (pos != pth);
513 schedule_transmission (pos);
521 * (re)try to reserve bandwidth from the given peer.
523 * @param cls the 'struct GSF_ConnectedPeer' to reserve from
524 * @param tc scheduler context
527 retry_reservation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
529 struct GSF_ConnectedPeer *cp = cls;
530 struct GNUNET_PeerIdentity target;
532 GNUNET_PEER_resolve (cp->ppd.pid, &target);
533 cp->rc_delay_task = GNUNET_SCHEDULER_NO_TASK;
535 GNUNET_ATS_reserve_bandwidth (ats, &target, DBLOCK_SIZE,
536 &ats_reserve_callback, cp);
541 * Function called by core upon success or failure of our bandwidth reservation request.
543 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
544 * @param peer identifies the peer
545 * @param amount set to the amount that was actually reserved or unreserved;
546 * either the full requested amount or zero (no partial reservations)
547 * @param res_delay if the reservation could not be satisfied (amount was 0), how
548 * long should the client wait until re-trying?
551 ats_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
552 int32_t amount, struct GNUNET_TIME_Relative res_delay)
554 struct GSF_ConnectedPeer *cp = cls;
555 struct GSF_PeerTransmitHandle *pth;
557 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
558 "Reserved %d bytes / need to wait %llu ms for reservation\n",
559 (int) amount, (unsigned long long) res_delay.rel_value);
564 GNUNET_SCHEDULER_add_delayed (res_delay, &retry_reservation, cp);
567 cp->did_reserve = GNUNET_YES;
569 if ((NULL != pth) && (NULL == cp->cth) && (0 == cp->cth_in_progress))
571 /* reservation success, try transmission now! */
572 cp->cth_in_progress++;
574 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES, pth->priority,
575 GNUNET_TIME_absolute_get_remaining
576 (pth->timeout), peer, pth->size,
577 &peer_transmit_ready_cb, cp);
578 GNUNET_assert (NULL != cp->cth);
579 GNUNET_assert (0 < cp->cth_in_progress--);
585 * A peer connected to us. Setup the connected peer
588 * @param peer identity of peer that connected
589 * @param atsi performance data for the connection
590 * @param atsi_count number of records in 'atsi'
591 * @return handle to connected peer entry
593 struct GSF_ConnectedPeer *
594 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
595 const struct GNUNET_ATS_Information *atsi,
596 unsigned int atsi_count)
598 struct GSF_ConnectedPeer *cp;
602 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connected to peer %s\n",
604 cp = GNUNET_malloc (sizeof (struct GSF_ConnectedPeer));
605 cp->ppd.pid = GNUNET_PEER_intern (peer);
606 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
608 GNUNET_ATS_reserve_bandwidth (ats, peer, DBLOCK_SIZE,
609 &ats_reserve_callback, cp);
610 fn = get_trust_filename (peer);
611 if ((GNUNET_DISK_file_test (fn) == GNUNET_YES) &&
612 (sizeof (trust) == GNUNET_DISK_fn_read (fn, &trust, sizeof (trust))))
613 cp->disk_trust = cp->ppd.trust = ntohl (trust);
615 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128);
616 GNUNET_break (GNUNET_OK ==
617 GNUNET_CONTAINER_multihashmap_put (cp_map, &peer->hashPubKey,
619 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
620 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
621 GNUNET_CONTAINER_multihashmap_size (cp_map),
623 update_atsi (cp, atsi, atsi_count);
624 GSF_push_start_ (cp);
630 * It may be time to re-start migrating content to this
631 * peer. Check, and if so, restart migration.
633 * @param cls the 'struct GSF_ConnectedPeer'
634 * @param tc scheduler context
637 revive_migration (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
639 struct GSF_ConnectedPeer *cp = cls;
640 struct GNUNET_TIME_Relative bt;
642 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
643 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
644 if (0 != bt.rel_value)
646 /* still time left... */
647 cp->mig_revive_task =
648 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
651 GSF_push_start_ (cp);
656 * Get a handle for a connected peer.
658 * @param peer peer's identity
659 * @return NULL if the peer is not currently connected
661 struct GSF_ConnectedPeer *
662 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
666 return GNUNET_CONTAINER_multihashmap_get (cp_map, &peer->hashPubKey);
671 * Handle P2P "MIGRATION_STOP" message.
673 * @param cls closure, always NULL
674 * @param other the other peer involved (sender or receiver, NULL
675 * for loopback messages where we are both sender and receiver)
676 * @param message the actual message
677 * @param atsi performance information
678 * @param atsi_count number of records in 'atsi'
679 * @return GNUNET_OK to keep the connection open,
680 * GNUNET_SYSERR to close it (signal serious error)
683 GSF_handle_p2p_migration_stop_ (void *cls,
684 const struct GNUNET_PeerIdentity *other,
685 const struct GNUNET_MessageHeader *message,
686 const struct GNUNET_ATS_Information *atsi,
687 unsigned int atsi_count)
689 struct GSF_ConnectedPeer *cp;
690 const struct MigrationStopMessage *msm;
691 struct GNUNET_TIME_Relative bt;
693 msm = (const struct MigrationStopMessage *) message;
694 cp = GSF_peer_get_ (other);
700 GNUNET_STATISTICS_update (GSF_stats,
701 gettext_noop ("# migration stop messages received"),
703 bt = GNUNET_TIME_relative_ntoh (msm->duration);
704 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
705 _("Migration of content to peer `%s' blocked for %llu ms\n"),
706 GNUNET_i2s (other), (unsigned long long) bt.rel_value);
707 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
708 if (cp->mig_revive_task == GNUNET_SCHEDULER_NO_TASK)
711 cp->mig_revive_task =
712 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
714 update_atsi (cp, atsi, atsi_count);
720 * Copy reply and free put message.
722 * @param cls the 'struct PutMessage'
723 * @param buf_size number of bytes available in buf
724 * @param buf where to copy the message, NULL on error (peer disconnect)
725 * @return number of bytes copied to 'buf', can be 0 (without indicating an error)
728 copy_reply (void *cls, size_t buf_size, void *buf)
730 struct PutMessage *pm = cls;
735 GNUNET_assert (buf_size >= ntohs (pm->header.size));
736 size = ntohs (pm->header.size);
737 memcpy (buf, pm, size);
738 GNUNET_STATISTICS_update (GSF_stats,
740 ("# replies transmitted to other peers"), 1,
746 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# replies dropped"), 1,
755 * Free resources associated with the given peer request.
757 * @param peerreq request to free
758 * @param query associated key for the request
761 free_pending_request (struct PeerRequest *peerreq,
762 const struct GNUNET_HashCode *query)
764 struct GSF_ConnectedPeer *cp = peerreq->cp;
766 if (peerreq->kill_task != GNUNET_SCHEDULER_NO_TASK)
768 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
769 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
771 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
773 GNUNET_break (GNUNET_YES ==
774 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
776 GNUNET_free (peerreq);
781 * Cancel all requests associated with the peer.
784 * @param query hash code of the request
785 * @param value the 'struct GSF_PendingRequest'
786 * @return GNUNET_YES (continue to iterate)
789 cancel_pending_request (void *cls, const struct GNUNET_HashCode * query, void *value)
791 struct PeerRequest *peerreq = value;
792 struct GSF_PendingRequest *pr = peerreq->pr;
793 struct GSF_PendingRequestData *prd;
795 prd = GSF_pending_request_get_data_ (pr);
796 GSF_pending_request_cancel_ (pr, GNUNET_NO);
797 free_pending_request (peerreq, &prd->query);
803 * Free the given request.
805 * @param cls the request to free
806 * @param tc task context
809 peer_request_destroy (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
811 struct PeerRequest *peerreq = cls;
812 struct GSF_PendingRequest *pr = peerreq->pr;
813 struct GSF_PendingRequestData *prd;
815 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
816 prd = GSF_pending_request_get_data_ (pr);
817 cancel_pending_request (NULL, &prd->query, peerreq);
822 * The artificial delay is over, transmit the message now.
824 * @param cls the 'struct GSF_DelayedHandle' with the message
825 * @param tc scheduler context
828 transmit_delayed_now (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
830 struct GSF_DelayedHandle *dh = cls;
831 struct GSF_ConnectedPeer *cp = dh->cp;
833 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
834 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
836 GNUNET_free (dh->pm);
840 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT,
841 dh->msize, ©_reply, dh->pm);
847 * Get the randomized delay a response should be subjected to.
849 * @return desired delay
851 static struct GNUNET_TIME_Relative
852 get_randomized_delay ()
854 struct GNUNET_TIME_Relative ret;
857 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
858 GNUNET_CRYPTO_random_u32
859 (GNUNET_CRYPTO_QUALITY_WEAK,
860 2 * GSF_avg_latency.rel_value + 1));
861 GNUNET_STATISTICS_update (GSF_stats,
863 ("# artificial delays introduced (ms)"),
864 ret.rel_value, GNUNET_NO);
871 * Handle a reply to a pending request. Also called if a request
872 * expires (then with data == NULL). The handler may be called
873 * many times (depending on the request type), but will not be
874 * called during or after a call to GSF_pending_request_cancel
875 * and will also not be called anymore after a call signalling
878 * @param cls 'struct PeerRequest' this is an answer for
879 * @param eval evaluation of the result
880 * @param pr handle to the original pending request
881 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
882 * @param expiration when does 'data' expire?
883 * @param last_transmission when did we last transmit a request for this block
884 * @param type type of the block
885 * @param data response data, NULL on request expiration
886 * @param data_len number of bytes in data
889 handle_p2p_reply (void *cls, enum GNUNET_BLOCK_EvaluationResult eval,
890 struct GSF_PendingRequest *pr, uint32_t reply_anonymity_level,
891 struct GNUNET_TIME_Absolute expiration,
892 struct GNUNET_TIME_Absolute last_transmission,
893 enum GNUNET_BLOCK_Type type, const void *data,
896 struct PeerRequest *peerreq = cls;
897 struct GSF_ConnectedPeer *cp = peerreq->cp;
898 struct GSF_PendingRequestData *prd;
899 struct PutMessage *pm;
902 GNUNET_assert (data_len + sizeof (struct PutMessage) <
903 GNUNET_SERVER_MAX_MESSAGE_SIZE);
904 GNUNET_assert (peerreq->pr == pr);
905 prd = GSF_pending_request_get_data_ (pr);
908 free_pending_request (peerreq, &prd->query);
911 GNUNET_break (type != GNUNET_BLOCK_TYPE_ANY);
912 if ((prd->type != type) && (prd->type != GNUNET_BLOCK_TYPE_ANY))
914 GNUNET_STATISTICS_update (GSF_stats,
916 ("# replies dropped due to type mismatch"),
920 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
921 "Transmitting result for query `%s' to peer\n",
922 GNUNET_h2s (&prd->query));
923 GNUNET_STATISTICS_update (GSF_stats,
924 gettext_noop ("# replies received for other peers"),
926 msize = sizeof (struct PutMessage) + data_len;
927 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
932 if ((reply_anonymity_level != UINT32_MAX) && (reply_anonymity_level > 1))
934 if (reply_anonymity_level - 1 > GSF_cover_content_count)
936 GNUNET_STATISTICS_update (GSF_stats,
938 ("# replies dropped due to insufficient cover traffic"),
942 GSF_cover_content_count -= (reply_anonymity_level - 1);
945 pm = GNUNET_malloc (msize);
946 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
947 pm->header.size = htons (msize);
948 pm->type = htonl (type);
949 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
950 memcpy (&pm[1], data, data_len);
951 if ((reply_anonymity_level != UINT32_MAX) && (reply_anonymity_level != 0) &&
952 (GSF_enable_randomized_delays == GNUNET_YES))
954 struct GSF_DelayedHandle *dh;
956 dh = GNUNET_malloc (sizeof (struct GSF_DelayedHandle));
960 GNUNET_CONTAINER_DLL_insert (cp->delayed_head, cp->delayed_tail, dh);
962 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
963 &transmit_delayed_now, dh);
967 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT, msize,
970 if (eval != GNUNET_BLOCK_EVALUATION_OK_LAST)
972 if (GNUNET_SCHEDULER_NO_TASK == peerreq->kill_task)
974 GNUNET_STATISTICS_update (GSF_stats,
976 ("# P2P searches destroyed due to ultimate reply"),
979 GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
985 * Increase the host credit by a value.
987 * @param cp which peer to change the trust value on
988 * @param value is the int value by which the
989 * host credit is to be increased or decreased
990 * @returns the actual change in trust (positive or negative)
993 change_host_trust (struct GSF_ConnectedPeer *cp, int value)
997 GNUNET_assert (cp != NULL);
1000 if (cp->ppd.trust + value < cp->ppd.trust)
1002 value = UINT32_MAX - cp->ppd.trust;
1003 cp->ppd.trust = UINT32_MAX;
1006 cp->ppd.trust += value;
1010 if (cp->ppd.trust < -value)
1012 value = -cp->ppd.trust;
1016 cp->ppd.trust += value;
1023 * We've received a request with the specified priority. Bound it
1024 * according to how much we trust the given peer.
1026 * @param prio_in requested priority
1027 * @param cp the peer making the request
1028 * @return effective priority
1031 bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
1033 #define N ((double)128.0)
1038 ld = GSF_test_get_load_too_high_ (0);
1039 if (ld == GNUNET_SYSERR)
1041 GNUNET_STATISTICS_update (GSF_stats,
1043 ("# requests done for free (low load)"), 1,
1045 return 0; /* excess resources */
1047 if (prio_in > INT32_MAX)
1048 prio_in = INT32_MAX;
1049 ret = -change_host_trust (cp, -(int) prio_in);
1052 if (ret > GSF_current_priorities + N)
1053 rret = GSF_current_priorities + N;
1056 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1058 if ((ld == GNUNET_YES) && (ret > 0))
1060 /* try with charging */
1061 ld = GSF_test_get_load_too_high_ (ret);
1063 if (ld == GNUNET_YES)
1065 GNUNET_STATISTICS_update (GSF_stats,
1067 ("# request dropped, priority insufficient"), 1,
1070 change_host_trust (cp, (int) ret);
1071 return -1; /* not enough resources */
1075 GNUNET_STATISTICS_update (GSF_stats,
1077 ("# requests done for a price (normal load)"), 1,
1086 * The priority level imposes a bound on the maximum
1087 * value for the ttl that can be requested.
1089 * @param ttl_in requested ttl
1090 * @param prio given priority
1091 * @return ttl_in if ttl_in is below the limit,
1092 * otherwise the ttl-limit for the given priority
1095 bound_ttl (int32_t ttl_in, uint32_t prio)
1097 unsigned long long allowed;
1101 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1102 if (ttl_in > allowed)
1104 if (allowed >= (1 << 30))
1113 * Handle P2P "QUERY" message. Creates the pending request entry
1114 * and sets up all of the data structures to that we will
1115 * process replies properly. Does not initiate forwarding or
1116 * local database lookups.
1118 * @param other the other peer involved (sender or receiver, NULL
1119 * for loopback messages where we are both sender and receiver)
1120 * @param message the actual message
1121 * @return pending request handle, NULL on error
1123 struct GSF_PendingRequest *
1124 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1125 const struct GNUNET_MessageHeader *message)
1127 struct PeerRequest *peerreq;
1128 struct GSF_PendingRequest *pr;
1129 struct GSF_PendingRequestData *prd;
1130 struct GSF_ConnectedPeer *cp;
1131 struct GSF_ConnectedPeer *cps;
1132 const struct GNUNET_HashCode *namespace;
1133 const struct GNUNET_PeerIdentity *target;
1134 enum GSF_PendingRequestOptions options;
1136 const struct GetMessage *gm;
1138 const struct GNUNET_HashCode *opt;
1141 uint32_t ttl_decrement;
1144 enum GNUNET_BLOCK_Type type;
1145 GNUNET_PEER_Id spid;
1147 GNUNET_assert (other != NULL);
1148 msize = ntohs (message->size);
1149 if (msize < sizeof (struct GetMessage))
1151 GNUNET_break_op (0);
1154 GNUNET_STATISTICS_update (GSF_stats,
1156 ("# GET requests received (from other peers)"), 1,
1158 gm = (const struct GetMessage *) message;
1159 type = ntohl (gm->type);
1160 bm = ntohl (gm->hash_bitmap);
1168 if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_HashCode))
1170 GNUNET_break_op (0);
1173 opt = (const struct GNUNET_HashCode *) &gm[1];
1174 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_HashCode);
1175 /* bfsize must be power of 2, check! */
1176 if (0 != ((bfsize - 1) & bfsize))
1178 GNUNET_break_op (0);
1181 GSF_cover_query_count++;
1182 bm = ntohl (gm->hash_bitmap);
1184 cps = GSF_peer_get_ (other);
1187 /* peer must have just disconnected */
1188 GNUNET_STATISTICS_update (GSF_stats,
1190 ("# requests dropped due to initiator not being connected"),
1194 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1195 cp = GSF_peer_get_ ((const struct GNUNET_PeerIdentity *) &opt[bits++]);
1200 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1201 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1202 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
1203 GNUNET_i2s ((const struct GNUNET_PeerIdentity *)
1207 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1208 "Failed to find peer `%4s' in connection set. Dropping query.\n",
1209 GNUNET_i2s (other));
1210 GNUNET_STATISTICS_update (GSF_stats,
1212 ("# requests dropped due to missing reverse route"),
1216 /* note that we can really only check load here since otherwise
1217 * peers could find out that we are overloaded by not being
1218 * disconnected after sending us a malformed query... */
1219 priority = bound_priority (ntohl (gm->priority), cps);
1222 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1223 "Dropping query from `%s', this peer is too busy.\n",
1224 GNUNET_i2s (other));
1227 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1228 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
1229 GNUNET_h2s (&gm->query), (unsigned int) type, GNUNET_i2s (other),
1231 namespace = (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE)) ? &opt[bits++] : NULL;
1232 if ((type == GNUNET_BLOCK_TYPE_FS_SBLOCK) && (namespace == NULL))
1234 GNUNET_break_op (0);
1237 if ((type != GNUNET_BLOCK_TYPE_FS_SBLOCK) && (namespace != NULL))
1239 GNUNET_break_op (0);
1244 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? ((const struct GNUNET_PeerIdentity
1245 *) &opt[bits++]) : NULL;
1246 options = GSF_PRO_DEFAULTS;
1248 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
1249 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1250 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value * 2 +
1251 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1253 /* don't have BW to send to peer, or would likely take longer than we have for it,
1254 * so at best indirect the query */
1256 options |= GSF_PRO_FORWARD_ONLY;
1257 spid = GNUNET_PEER_intern (other);
1258 GNUNET_assert (0 != spid);
1260 ttl = bound_ttl (ntohl (gm->ttl), priority);
1261 /* decrement ttl (always) */
1263 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1265 if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
1267 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1268 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1269 GNUNET_i2s (other), ttl, ttl_decrement);
1270 GNUNET_STATISTICS_update (GSF_stats,
1272 ("# requests dropped due TTL underflow"), 1,
1274 /* integer underflow => drop (should be very rare)! */
1277 ttl -= ttl_decrement;
1279 /* test if the request already exists */
1280 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map, &gm->query);
1281 if (peerreq != NULL)
1284 prd = GSF_pending_request_get_data_ (pr);
1285 if ((prd->type == type) &&
1286 ((type != GNUNET_BLOCK_TYPE_FS_SBLOCK) ||
1287 (0 == memcmp (&prd->namespace, namespace, sizeof (struct GNUNET_HashCode)))))
1289 if (prd->ttl.abs_value >= GNUNET_TIME_absolute_get ().abs_value + ttl)
1291 /* existing request has higher TTL, drop new one! */
1292 prd->priority += priority;
1293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1294 "Have existing request with higher TTL, dropping new request.\n",
1295 GNUNET_i2s (other));
1296 GNUNET_STATISTICS_update (GSF_stats,
1298 ("# requests dropped due to higher-TTL request"),
1302 /* existing request has lower TTL, drop old one! */
1303 priority += prd->priority;
1304 GSF_pending_request_cancel_ (pr, GNUNET_YES);
1305 free_pending_request (peerreq, &gm->query);
1309 peerreq = GNUNET_malloc (sizeof (struct PeerRequest));
1311 pr = GSF_pending_request_create_ (options, type, &gm->query, namespace,
1314 0) ? (const char *) &opt[bits] : NULL,
1315 bfsize, ntohl (gm->filter_mutator),
1317 (uint32_t) priority, ttl, spid, GNUNET_PEER_intern (other), NULL, 0, /* replies_seen */
1318 &handle_p2p_reply, peerreq);
1319 GNUNET_assert (NULL != pr);
1321 GNUNET_break (GNUNET_OK ==
1322 GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
1324 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1325 GNUNET_STATISTICS_update (GSF_stats,
1327 ("# P2P query messages received and processed"), 1,
1329 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
1336 * Function called if there has been a timeout trying to satisfy
1337 * a transmission request.
1339 * @param cls the 'struct GSF_PeerTransmitHandle' of the request
1340 * @param tc scheduler context
1343 peer_transmit_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1345 struct GSF_PeerTransmitHandle *pth = cls;
1346 struct GSF_ConnectedPeer *cp;
1348 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1349 "Timeout trying to transmit to other peer\n");
1350 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1352 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1353 if (GNUNET_YES == pth->is_query)
1354 GNUNET_assert (0 < cp->ppd.pending_queries--);
1355 else if (GNUNET_NO == pth->is_query)
1356 GNUNET_assert (0 < cp->ppd.pending_replies--);
1357 GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
1358 if (NULL != cp->cth)
1360 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1363 pth->gmc (pth->gmc_cls, 0, NULL);
1364 GNUNET_assert (0 == cp->cth_in_progress);
1370 * Transmit a message to the given peer as soon as possible.
1371 * If the peer disconnects before the transmission can happen,
1372 * the callback is invoked with a 'NULL' buffer.
1374 * @param cp target peer
1375 * @param is_query is this a query (GNUNET_YES) or content (GNUNET_NO) or neither (GNUNET_SYSERR)
1376 * @param priority how important is this request?
1377 * @param timeout when does this request timeout (call gmc with error)
1378 * @param size number of bytes we would like to send to the peer
1379 * @param gmc function to call to get the message
1380 * @param gmc_cls closure for gmc
1381 * @return handle to cancel request
1383 struct GSF_PeerTransmitHandle *
1384 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp, int is_query,
1385 uint32_t priority, struct GNUNET_TIME_Relative timeout,
1386 size_t size, GSF_GetMessageCallback gmc, void *gmc_cls)
1388 struct GSF_PeerTransmitHandle *pth;
1389 struct GSF_PeerTransmitHandle *pos;
1390 struct GSF_PeerTransmitHandle *prev;
1392 pth = GNUNET_malloc (sizeof (struct GSF_PeerTransmitHandle));
1393 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1394 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1396 pth->gmc_cls = gmc_cls;
1398 pth->is_query = is_query;
1399 pth->priority = priority;
1401 /* insertion sort (by priority, descending) */
1404 while ((pos != NULL) && (pos->priority > priority))
1409 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head, cp->pth_tail, prev, pth);
1410 if (GNUNET_YES == is_query)
1411 cp->ppd.pending_queries++;
1412 else if (GNUNET_NO == is_query)
1413 cp->ppd.pending_replies++;
1415 GNUNET_SCHEDULER_add_delayed (timeout, &peer_transmit_timeout, pth);
1416 schedule_transmission (pth);
1422 * Cancel an earlier request for transmission.
1424 * @param pth request to cancel
1427 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1429 struct GSF_ConnectedPeer *cp;
1431 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1433 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1434 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1437 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1438 if (GNUNET_YES == pth->is_query)
1439 GNUNET_assert (0 < cp->ppd.pending_queries--);
1440 else if (GNUNET_NO == pth->is_query)
1441 GNUNET_assert (0 < cp->ppd.pending_replies--);
1447 * Report on receiving a reply; update the performance record of the given peer.
1449 * @param cp responding peer (will be updated)
1450 * @param request_time time at which the original query was transmitted
1451 * @param request_priority priority of the original request
1454 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1455 struct GNUNET_TIME_Absolute request_time,
1456 uint32_t request_priority)
1458 struct GNUNET_TIME_Relative delay;
1460 delay = GNUNET_TIME_absolute_get_duration (request_time);
1461 cp->ppd.avg_reply_delay.rel_value =
1462 (cp->ppd.avg_reply_delay.rel_value * (RUNAVG_DELAY_N - 1) +
1463 delay.rel_value) / RUNAVG_DELAY_N;
1464 cp->ppd.avg_priority =
1465 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1466 request_priority) / RUNAVG_DELAY_N;
1471 * Report on receiving a reply in response to an initiating client.
1472 * Remember that this peer is good for this client.
1474 * @param cp responding peer (will be updated)
1475 * @param initiator_client local client on responsible for query
1478 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1479 struct GSF_LocalClient *initiator_client)
1481 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1482 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1487 * Report on receiving a reply in response to an initiating peer.
1488 * Remember that this peer is good for this initiating peer.
1490 * @param cp responding peer (will be updated)
1491 * @param initiator_peer other peer responsible for query
1494 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1495 const struct GSF_ConnectedPeer *initiator_peer)
1499 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1500 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1501 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1502 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1503 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1508 * A peer disconnected from us. Tear down the connected peer
1512 * @param peer identity of peer that connected
1515 GSF_peer_disconnect_handler_ (void *cls, const struct GNUNET_PeerIdentity *peer)
1517 struct GSF_ConnectedPeer *cp;
1518 struct GSF_PeerTransmitHandle *pth;
1519 struct GSF_DelayedHandle *dh;
1521 cp = GSF_peer_get_ (peer);
1523 return; /* must have been disconnect from core with
1524 * 'peer' == my_id, ignore */
1525 GNUNET_assert (GNUNET_YES ==
1526 GNUNET_CONTAINER_multihashmap_remove (cp_map,
1527 &peer->hashPubKey, cp));
1528 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
1529 GNUNET_CONTAINER_multihashmap_size (cp_map),
1531 if (NULL != cp->migration_pth)
1533 GSF_peer_transmit_cancel_ (cp->migration_pth);
1534 cp->migration_pth = NULL;
1538 GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
1541 if (GNUNET_SCHEDULER_NO_TASK != cp->rc_delay_task)
1543 GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
1544 cp->rc_delay_task = GNUNET_SCHEDULER_NO_TASK;
1546 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1547 &cancel_pending_request, cp);
1548 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1549 cp->request_map = NULL;
1550 GSF_plan_notify_peer_disconnect_ (cp);
1551 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1552 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1553 memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
1554 GSF_push_stop_ (cp);
1555 if (NULL != cp->cth)
1557 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1560 GNUNET_assert (0 == cp->cth_in_progress);
1561 while (NULL != (pth = cp->pth_head))
1563 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1565 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1566 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1568 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1569 pth->gmc (pth->gmc_cls, 0, NULL);
1572 while (NULL != (dh = cp->delayed_head))
1574 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
1575 GNUNET_SCHEDULER_cancel (dh->delay_task);
1576 GNUNET_free (dh->pm);
1579 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1580 if (GNUNET_SCHEDULER_NO_TASK != cp->mig_revive_task)
1582 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1583 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
1590 * Closure for 'call_iterator'.
1592 struct IterationContext
1595 * Function to call on each entry.
1597 GSF_ConnectedPeerIterator it;
1607 * Function that calls the callback for each peer.
1609 * @param cls the 'struct IterationContext*'
1610 * @param key identity of the peer
1611 * @param value the 'struct GSF_ConnectedPeer*'
1612 * @return GNUNET_YES to continue iteration
1615 call_iterator (void *cls, const struct GNUNET_HashCode * key, void *value)
1617 struct IterationContext *ic = cls;
1618 struct GSF_ConnectedPeer *cp = value;
1620 ic->it (ic->it_cls, (const struct GNUNET_PeerIdentity *) key, cp, &cp->ppd);
1626 * Iterate over all connected peers.
1628 * @param it function to call for each peer
1629 * @param it_cls closure for it
1632 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it, void *it_cls)
1634 struct IterationContext ic;
1638 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &call_iterator, &ic);
1643 * Obtain the identity of a connected peer.
1645 * @param cp peer to reserve bandwidth from
1646 * @param id identity to set (written to)
1649 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1650 struct GNUNET_PeerIdentity *id)
1652 GNUNET_assert (0 != cp->ppd.pid);
1653 GNUNET_PEER_resolve (cp->ppd.pid, id);
1658 * Assemble a migration stop message for transmission.
1660 * @param cls the 'struct GSF_ConnectedPeer' to use
1661 * @param size number of bytes we're allowed to write to buf
1662 * @param buf where to copy the message
1663 * @return number of bytes copied to buf
1666 create_migration_stop_message (void *cls, size_t size, void *buf)
1668 struct GSF_ConnectedPeer *cp = cls;
1669 struct MigrationStopMessage msm;
1671 cp->migration_pth = NULL;
1674 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1675 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1676 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1677 msm.reserved = htonl (0);
1679 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1680 (cp->last_migration_block));
1681 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1682 GNUNET_STATISTICS_update (GSF_stats,
1683 gettext_noop ("# migration stop messages sent"),
1685 return sizeof (struct MigrationStopMessage);
1690 * Ask a peer to stop migrating data to us until the given point
1693 * @param cp peer to ask
1694 * @param block_time until when to block
1697 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1698 struct GNUNET_TIME_Absolute block_time)
1700 if (cp->last_migration_block.abs_value > block_time.abs_value)
1702 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1703 "Migration already blocked for another %llu ms\n",
1704 (unsigned long long)
1705 GNUNET_TIME_absolute_get_remaining
1706 (cp->last_migration_block).rel_value);
1707 return; /* already blocked */
1709 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %llu ms\n",
1710 (unsigned long long) GNUNET_TIME_absolute_get_remaining (block_time).rel_value);
1711 cp->last_migration_block = block_time;
1712 if (cp->migration_pth != NULL)
1713 GSF_peer_transmit_cancel_ (cp->migration_pth);
1715 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1716 GNUNET_TIME_UNIT_FOREVER_REL,
1717 sizeof (struct MigrationStopMessage),
1718 &create_migration_stop_message, cp);
1723 * Write host-trust information to a file - flush the buffer entry!
1725 * @param cls closure, not used
1726 * @param key host identity
1727 * @param value the 'struct GSF_ConnectedPeer' to flush
1728 * @return GNUNET_OK to continue iteration
1731 flush_trust (void *cls, const struct GNUNET_HashCode * key, void *value)
1733 struct GSF_ConnectedPeer *cp = value;
1736 struct GNUNET_PeerIdentity pid;
1738 if (cp->ppd.trust == cp->disk_trust)
1739 return GNUNET_OK; /* unchanged */
1740 GNUNET_assert (0 != cp->ppd.pid);
1741 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1742 fn = get_trust_filename (&pid);
1743 if (cp->ppd.trust == 0)
1745 if ((0 != UNLINK (fn)) && (errno != ENOENT))
1746 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING |
1747 GNUNET_ERROR_TYPE_BULK, "unlink", fn);
1751 trust = htonl (cp->ppd.trust);
1752 if (sizeof (uint32_t) ==
1753 GNUNET_DISK_fn_write (fn, &trust, sizeof (uint32_t),
1754 GNUNET_DISK_PERM_USER_READ |
1755 GNUNET_DISK_PERM_USER_WRITE |
1756 GNUNET_DISK_PERM_GROUP_READ |
1757 GNUNET_DISK_PERM_OTHER_READ))
1758 cp->disk_trust = cp->ppd.trust;
1766 * Notify core about a preference we have for the given peer
1767 * (to allocate more resources towards it). The change will
1768 * be communicated the next time we reserve bandwidth with
1769 * core (not instantly).
1771 * @param cp peer to reserve bandwidth from
1772 * @param pref preference change
1775 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1778 cp->inc_preference += pref;
1783 * Call this method periodically to flush trust information to disk.
1785 * @param cls closure, not used
1786 * @param tc task context, not used
1789 cron_flush_trust (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1794 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &flush_trust, NULL);
1797 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1799 GNUNET_SCHEDULER_add_delayed_with_priority (TRUST_FLUSH_FREQ,
1800 GNUNET_SCHEDULER_PRIORITY_HIGH,
1801 &cron_flush_trust, NULL);
1806 * Initialize peer management subsystem.
1809 GSF_connected_peer_init_ ()
1811 cp_map = GNUNET_CONTAINER_multihashmap_create (128);
1812 ats = GNUNET_ATS_performance_init (GSF_cfg, NULL, NULL);
1813 GNUNET_assert (GNUNET_OK ==
1814 GNUNET_CONFIGURATION_get_value_filename (GSF_cfg, "fs",
1817 GNUNET_DISK_directory_create (trustDirectory);
1818 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1819 &cron_flush_trust, NULL);
1824 * Iterator to free peer entries.
1826 * @param cls closure, unused
1827 * @param key current key code
1828 * @param value value in the hash map (peer entry)
1829 * @return GNUNET_YES (we should continue to iterate)
1832 clean_peer (void *cls, const struct GNUNET_HashCode * key, void *value)
1834 GSF_peer_disconnect_handler_ (NULL, (const struct GNUNET_PeerIdentity *) key);
1840 * Shutdown peer management subsystem.
1843 GSF_connected_peer_done_ ()
1845 cron_flush_trust (NULL, NULL);
1846 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &clean_peer, NULL);
1847 GNUNET_CONTAINER_multihashmap_destroy (cp_map);
1849 GNUNET_free (trustDirectory);
1850 trustDirectory = NULL;
1851 GNUNET_ATS_performance_done (ats);
1857 * Iterator to remove references to LC entry.
1859 * @param cls the 'struct GSF_LocalClient*' to look for
1860 * @param key current key code
1861 * @param value value in the hash map (peer entry)
1862 * @return GNUNET_YES (we should continue to iterate)
1865 clean_local_client (void *cls, const struct GNUNET_HashCode * key, void *value)
1867 const struct GSF_LocalClient *lc = cls;
1868 struct GSF_ConnectedPeer *cp = value;
1871 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
1872 if (cp->ppd.last_client_replies[i] == lc)
1873 cp->ppd.last_client_replies[i] = NULL;
1879 * Notification that a local client disconnected. Clean up all of our
1880 * references to the given handle.
1882 * @param lc handle to the local client (henceforth invalid)
1885 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
1888 return; /* already cleaned up */
1889 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &clean_local_client,
1894 /* end of gnunet-service-fs_cp.c */