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)
339 /* how can we not have latency data? */
340 return GNUNET_TIME_UNIT_SECONDS;
342 return GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
343 ntohl (atsi->value));
348 * Update the performance information kept for the given peer.
350 * @param cp peer record to update
351 * @param atsi transport performance data
354 update_atsi (struct GSF_ConnectedPeer *cp,
355 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
357 struct GNUNET_TIME_Relative latency;
359 latency = get_latency (atsi);
360 GNUNET_LOAD_value_set_decline (cp->ppd.transmission_delay,
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,
396 * Function called by core upon success or failure of our bandwidth reservation request.
398 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
399 * @param peer identifies the peer
400 * @param bandwidth_out available amount of outbound bandwidth
401 * @param amount set to the amount that was actually reserved or unreserved;
402 * either the full requested amount or zero (no partial reservations)
403 * @param res_delay if the reservation could not be satisfied (amount was 0), how
404 * long should the client wait until re-trying?
405 * @param preference current traffic preference for the given peer
408 core_reserve_callback (void *cls,
409 const struct GNUNET_PeerIdentity *peer,
410 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
412 struct GNUNET_TIME_Relative res_delay,
413 uint64_t preference);
417 * If ready (bandwidth reserved), try to schedule transmission via
418 * core for the given handle.
420 * @param pth transmission handle to schedule
423 schedule_transmission (struct GSF_PeerTransmitHandle *pth)
425 struct GSF_ConnectedPeer *cp;
426 struct GNUNET_PeerIdentity target;
429 if ( (NULL != pth->cth) ||
430 (0 != pth->cth_in_progress) )
431 return; /* already done */
433 GNUNET_PEER_resolve (cp->ppd.pid,
435 if ( (GNUNET_YES == pth->is_query) &&
436 (GNUNET_YES != pth->was_reserved) )
438 /* query, need reservation */
439 if (GNUNET_YES != cp->did_reserve)
440 return; /* not ready */
441 cp->did_reserve = GNUNET_NO;
442 /* reservation already done! */
443 pth->was_reserved = GNUNET_YES;
444 ip = cp->inc_preference;
445 cp->inc_preference = 0;
446 cp->irc = GNUNET_CORE_peer_change_preference (GSF_core,
448 GNUNET_TIME_UNIT_FOREVER_REL,
449 GNUNET_BANDWIDTH_VALUE_MAX,
452 &core_reserve_callback,
455 GNUNET_assert (pth->cth == NULL);
456 pth->cth_in_progress++;
457 pth->cth = GNUNET_CORE_notify_transmit_ready (GSF_core,
460 GNUNET_TIME_absolute_get_remaining (pth->timeout),
463 &peer_transmit_ready_cb,
465 GNUNET_assert (0 < pth->cth_in_progress--);
470 * Core is ready to transmit to a peer, get the message.
472 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
473 * @param size number of bytes core is willing to take
474 * @param buf where to copy the message
475 * @return number of bytes copied to buf
478 peer_transmit_ready_cb (void *cls,
482 struct GSF_PeerTransmitHandle *pth = cls;
483 struct GSF_PeerTransmitHandle *pos;
484 struct GSF_ConnectedPeer *cp;
487 GNUNET_assert ( (NULL == buf) ||
488 (pth->size <= size) );
490 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
492 GNUNET_SCHEDULER_cancel (pth->timeout_task);
493 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
496 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
499 if (GNUNET_YES == pth->is_query)
501 cp->ppd.last_request_times[(cp->last_request_times_off++) % MAX_QUEUE_PER_PEER] = GNUNET_TIME_absolute_get ();
502 GNUNET_assert (0 < cp->ppd.pending_queries--);
504 else if (GNUNET_NO == pth->is_query)
506 GNUNET_assert (0 < cp->ppd.pending_replies--);
508 GNUNET_LOAD_update (cp->ppd.transmission_delay,
509 GNUNET_TIME_absolute_get_duration (pth->transmission_request_start_time).rel_value);
510 ret = pth->gmc (pth->gmc_cls,
512 GNUNET_assert (NULL == pth->cth);
513 for (pos = cp->pth_head; pos != NULL; pos = pos->next)
515 GNUNET_assert (pos != pth);
516 schedule_transmission (pos);
518 GNUNET_assert (pth->cth == NULL);
519 GNUNET_assert (pth->cth_in_progress == 0);
526 * (re)try to reserve bandwidth from the given peer.
528 * @param cls the 'struct GSF_ConnectedPeer' to reserve from
529 * @param tc scheduler context
532 retry_reservation (void *cls,
533 const struct GNUNET_SCHEDULER_TaskContext *tc)
535 struct GSF_ConnectedPeer *cp = cls;
537 struct GNUNET_PeerIdentity target;
539 GNUNET_PEER_resolve (cp->ppd.pid,
541 cp->irc_delay_task = GNUNET_SCHEDULER_NO_TASK;
542 ip = cp->inc_preference;
543 cp->inc_preference = 0;
544 cp->irc = GNUNET_CORE_peer_change_preference (GSF_core,
546 GNUNET_TIME_UNIT_FOREVER_REL,
547 GNUNET_BANDWIDTH_VALUE_MAX,
550 &core_reserve_callback,
556 * Function called by core upon success or failure of our bandwidth reservation request.
558 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
559 * @param peer identifies the peer
560 * @param bandwidth_out available amount of outbound bandwidth
561 * @param amount set to the amount that was actually reserved or unreserved;
562 * either the full requested amount or zero (no partial reservations)
563 * @param res_delay if the reservation could not be satisfied (amount was 0), how
564 * long should the client wait until re-trying?
565 * @param preference current traffic preference for the given peer
568 core_reserve_callback (void *cls,
569 const struct GNUNET_PeerIdentity *peer,
570 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
572 struct GNUNET_TIME_Relative res_delay,
575 struct GSF_ConnectedPeer *cp = cls;
576 struct GSF_PeerTransmitHandle *pth;
581 cp->irc_delay_task = GNUNET_SCHEDULER_add_delayed (res_delay,
586 cp->did_reserve = GNUNET_YES;
588 if ( (NULL != pth) &&
591 /* reservation success, try transmission now! */
592 pth->cth_in_progress++;
593 pth->cth = GNUNET_CORE_notify_transmit_ready (GSF_core,
596 GNUNET_TIME_absolute_get_remaining (pth->timeout),
599 &peer_transmit_ready_cb,
601 GNUNET_assert (0 < pth->cth_in_progress--);
607 * A peer connected to us. Setup the connected peer
610 * @param peer identity of peer that connected
611 * @param atsi performance data for the connection
612 * @return handle to connected peer entry
614 struct GSF_ConnectedPeer *
615 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
616 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
618 struct GSF_ConnectedPeer *cp;
622 cp = GNUNET_malloc (sizeof (struct GSF_ConnectedPeer));
623 cp->ppd.pid = GNUNET_PEER_intern (peer);
624 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
625 cp->irc = GNUNET_CORE_peer_change_preference (GSF_core,
627 GNUNET_TIME_UNIT_FOREVER_REL,
628 GNUNET_BANDWIDTH_VALUE_MAX,
631 &core_reserve_callback,
633 fn = get_trust_filename (peer);
634 if ((GNUNET_DISK_file_test (fn) == GNUNET_YES) &&
635 (sizeof (trust) == GNUNET_DISK_fn_read (fn, &trust, sizeof (trust))))
636 cp->disk_trust = cp->ppd.trust = ntohl (trust);
638 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128);
639 GNUNET_break (GNUNET_OK ==
640 GNUNET_CONTAINER_multihashmap_put (cp_map,
643 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
644 update_atsi (cp, atsi);
645 GSF_push_start_ (cp);
651 * It may be time to re-start migrating content to this
652 * peer. Check, and if so, restart migration.
654 * @param cls the 'struct GSF_ConnectedPeer'
655 * @param tc scheduler context
658 revive_migration (void *cls,
659 const struct GNUNET_SCHEDULER_TaskContext *tc)
661 struct GSF_ConnectedPeer *cp = cls;
662 struct GNUNET_TIME_Relative bt;
664 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
665 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
666 if (0 != bt.rel_value)
668 /* still time left... */
670 = GNUNET_SCHEDULER_add_delayed (bt,
675 GSF_push_start_ (cp);
680 * Get a handle for a connected peer.
682 * @param peer peer's identity
683 * @return NULL if the peer is not currently connected
685 struct GSF_ConnectedPeer *
686 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
688 return GNUNET_CONTAINER_multihashmap_get (cp_map,
694 * Handle P2P "MIGRATION_STOP" message.
696 * @param cls closure, always NULL
697 * @param other the other peer involved (sender or receiver, NULL
698 * for loopback messages where we are both sender and receiver)
699 * @param message the actual message
700 * @param atsi performance information
701 * @return GNUNET_OK to keep the connection open,
702 * GNUNET_SYSERR to close it (signal serious error)
705 GSF_handle_p2p_migration_stop_ (void *cls,
706 const struct GNUNET_PeerIdentity *other,
707 const struct GNUNET_MessageHeader *message,
708 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
710 struct GSF_ConnectedPeer *cp;
711 const struct MigrationStopMessage *msm;
712 struct GNUNET_TIME_Relative bt;
714 msm = (const struct MigrationStopMessage*) message;
715 cp = GNUNET_CONTAINER_multihashmap_get (cp_map,
722 bt = GNUNET_TIME_relative_ntoh (msm->duration);
723 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
724 _("Migration of content to peer `%s' blocked for %llu ms\n"),
726 (unsigned long long) bt.rel_value);
727 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
728 if (cp->mig_revive_task == GNUNET_SCHEDULER_NO_TASK)
732 = GNUNET_SCHEDULER_add_delayed (bt,
736 update_atsi (cp, atsi);
742 * Copy reply and free put message.
744 * @param cls the 'struct PutMessage'
745 * @param buf_size number of bytes available in buf
746 * @param buf where to copy the message, NULL on error (peer disconnect)
747 * @return number of bytes copied to 'buf', can be 0 (without indicating an error)
750 copy_reply (void *cls,
754 struct PutMessage *pm = cls;
759 GNUNET_assert (buf_size >= ntohs (pm->header.size));
760 size = ntohs (pm->header.size);
761 memcpy (buf, pm, size);
762 GNUNET_STATISTICS_update (GSF_stats,
763 gettext_noop ("# replies transmitted to other peers"),
770 GNUNET_STATISTICS_update (GSF_stats,
771 gettext_noop ("# replies dropped"),
781 * Free the given request.
783 * @param cls the request to free
784 * @param tc task context
787 peer_request_destroy (void *cls,
788 const struct GNUNET_SCHEDULER_TaskContext *tc)
790 struct PeerRequest *peerreq = cls;
791 struct GSF_PendingRequest *pr = peerreq->pr;
792 struct GSF_ConnectedPeer *cp = peerreq->cp;
793 struct GSF_PendingRequestData *prd;
795 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
796 prd = GSF_pending_request_get_data_ (pr);
797 GNUNET_STATISTICS_update (GSF_stats,
798 gettext_noop ("# P2P searches active"),
801 GNUNET_break (GNUNET_OK ==
802 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
805 GSF_pending_request_cancel_ (pr);
806 GNUNET_free (peerreq);
811 * The artificial delay is over, transmit the message now.
813 * @param cls the 'struct GSF_DelayedHandle' with the message
814 * @param tc scheduler context
817 transmit_delayed_now (void *cls,
818 const struct GNUNET_SCHEDULER_TaskContext *tc)
820 struct GSF_DelayedHandle *dh = cls;
821 struct GSF_ConnectedPeer *cp = dh->cp;
823 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
826 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
828 GNUNET_free (dh->pm);
832 (void) GSF_peer_transmit_ (cp, GNUNET_NO,
843 * Get the randomized delay a response should be subjected to.
845 * @return desired delay
847 static struct GNUNET_TIME_Relative
848 get_randomized_delay ()
850 struct GNUNET_TIME_Relative ret;
852 /* FIXME: replace 5000 with something relating to current observed P2P message latency */
853 ret = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
854 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
856 GNUNET_STATISTICS_update (GSF_stats,
857 gettext_noop ("# artificial delays introduced (ms)"),
866 * Handle a reply to a pending request. Also called if a request
867 * expires (then with data == NULL). The handler may be called
868 * many times (depending on the request type), but will not be
869 * called during or after a call to GSF_pending_request_cancel
870 * and will also not be called anymore after a call signalling
873 * @param cls 'struct PeerRequest' this is an answer for
874 * @param eval evaluation of the result
875 * @param pr handle to the original pending request
876 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
877 * @param expiration when does 'data' expire?
878 * @param type type of the block
879 * @param data response data, NULL on request expiration
880 * @param data_len number of bytes in data
883 handle_p2p_reply (void *cls,
884 enum GNUNET_BLOCK_EvaluationResult eval,
885 struct GSF_PendingRequest *pr,
886 uint32_t reply_anonymity_level,
887 struct GNUNET_TIME_Absolute expiration,
888 enum GNUNET_BLOCK_Type type,
892 struct PeerRequest *peerreq = cls;
893 struct GSF_ConnectedPeer *cp = peerreq->cp;
894 struct GSF_PendingRequestData *prd;
895 struct PutMessage *pm;
898 GNUNET_assert (data_len + sizeof (struct PutMessage) < GNUNET_SERVER_MAX_MESSAGE_SIZE);
899 GNUNET_assert (peerreq->pr == pr);
900 prd = GSF_pending_request_get_data_ (pr);
903 GNUNET_STATISTICS_update (GSF_stats,
904 gettext_noop ("# P2P searches active"),
907 GNUNET_break (GNUNET_OK ==
908 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
911 GNUNET_free (peerreq);
914 GNUNET_break (type != GNUNET_BLOCK_TYPE_ANY);
915 if ( (prd->type != type) &&
916 (prd->type != GNUNET_BLOCK_TYPE_ANY) )
922 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
923 "Transmitting result for query `%s' to peer\n",
924 GNUNET_h2s (&prd->query));
926 GNUNET_STATISTICS_update (GSF_stats,
927 gettext_noop ("# replies received for other peers"),
930 msize = sizeof (struct PutMessage) + data_len;
931 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
936 if ( (reply_anonymity_level != UINT32_MAX) &&
937 (reply_anonymity_level > 1) )
939 if (reply_anonymity_level - 1 > GSF_cover_content_count)
941 GNUNET_STATISTICS_update (GSF_stats,
942 gettext_noop ("# replies dropped due to insufficient cover traffic"),
947 GSF_cover_content_count -= (reply_anonymity_level - 1);
950 pm = GNUNET_malloc (msize);
951 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
952 pm->header.size = htons (msize);
953 pm->type = htonl (type);
954 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
955 memcpy (&pm[1], data, data_len);
956 if ( (reply_anonymity_level != UINT32_MAX) &&
957 (reply_anonymity_level != 0) &&
958 (GSF_enable_randomized_delays == GNUNET_YES) )
960 struct GSF_DelayedHandle *dh;
962 dh = GNUNET_malloc (sizeof (struct GSF_DelayedHandle));
966 GNUNET_CONTAINER_DLL_insert (cp->delayed_head,
969 dh->delay_task = GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
970 &transmit_delayed_now,
975 (void) GSF_peer_transmit_ (cp, GNUNET_NO,
982 if (eval != GNUNET_BLOCK_EVALUATION_OK_LAST)
984 if (GNUNET_SCHEDULER_NO_TASK == peerreq->kill_task)
985 peerreq->kill_task = GNUNET_SCHEDULER_add_now (&peer_request_destroy,
991 * Increase the host credit by a value.
993 * @param cp which peer to change the trust value on
994 * @param value is the int value by which the
995 * host credit is to be increased or decreased
996 * @returns the actual change in trust (positive or negative)
999 change_host_trust (struct GSF_ConnectedPeer *cp, int value)
1003 GNUNET_assert (cp != NULL);
1006 if (cp->ppd.trust + value < cp->ppd.trust)
1008 value = UINT32_MAX - cp->ppd.trust;
1009 cp->ppd.trust = UINT32_MAX;
1012 cp->ppd.trust += value;
1016 if (cp->ppd.trust < -value)
1018 value = -cp->ppd.trust;
1022 cp->ppd.trust += value;
1029 * We've received a request with the specified priority. Bound it
1030 * according to how much we trust the given peer.
1032 * @param prio_in requested priority
1033 * @param cp the peer making the request
1034 * @return effective priority
1037 bound_priority (uint32_t prio_in,
1038 struct GSF_ConnectedPeer *cp)
1040 #define N ((double)128.0)
1045 ld = GSF_test_get_load_too_high_ (0);
1046 if (ld == GNUNET_SYSERR)
1048 GNUNET_STATISTICS_update (GSF_stats,
1049 gettext_noop ("# requests done for free (low load)"),
1052 return 0; /* excess resources */
1054 if (prio_in > INT32_MAX)
1055 prio_in = INT32_MAX;
1056 ret = - change_host_trust (cp, - (int) prio_in);
1059 if (ret > GSF_current_priorities + N)
1060 rret = GSF_current_priorities + N;
1063 GSF_current_priorities
1064 = (GSF_current_priorities * (N-1) + rret)/N;
1066 if ( (ld == GNUNET_YES) && (ret > 0) )
1068 /* try with charging */
1069 ld = GSF_test_get_load_too_high_ (ret);
1071 if (ld == GNUNET_YES)
1073 GNUNET_STATISTICS_update (GSF_stats,
1074 gettext_noop ("# request dropped, priority insufficient"),
1078 change_host_trust (cp, (int) ret);
1079 return -1; /* not enough resources */
1083 GNUNET_STATISTICS_update (GSF_stats,
1084 gettext_noop ("# requests done for a price (normal load)"),
1094 * The priority level imposes a bound on the maximum
1095 * value for the ttl that can be requested.
1097 * @param ttl_in requested ttl
1098 * @param prio given priority
1099 * @return ttl_in if ttl_in is below the limit,
1100 * otherwise the ttl-limit for the given priority
1103 bound_ttl (int32_t ttl_in, uint32_t prio)
1105 unsigned long long allowed;
1109 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1110 if (ttl_in > allowed)
1112 if (allowed >= (1 << 30))
1121 * Handle P2P "QUERY" message. Creates the pending request entry
1122 * and sets up all of the data structures to that we will
1123 * process replies properly. Does not initiate forwarding or
1124 * local database lookups.
1126 * @param other the other peer involved (sender or receiver, NULL
1127 * for loopback messages where we are both sender and receiver)
1128 * @param message the actual message
1129 * @return pending request handle, NULL on error
1131 struct GSF_PendingRequest *
1132 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1133 const struct GNUNET_MessageHeader *message)
1135 struct PeerRequest *peerreq;
1136 struct GSF_PendingRequest *pr;
1137 struct GSF_PendingRequestData *prd;
1138 struct GSF_ConnectedPeer *cp;
1139 struct GSF_ConnectedPeer *cps;
1140 const GNUNET_HashCode *namespace;
1141 const struct GNUNET_PeerIdentity *target;
1142 enum GSF_PendingRequestOptions options;
1144 const struct GetMessage *gm;
1146 const GNUNET_HashCode *opt;
1149 uint32_t ttl_decrement;
1152 enum GNUNET_BLOCK_Type type;
1153 GNUNET_PEER_Id spid;
1155 msize = ntohs(message->size);
1156 if (msize < sizeof (struct GetMessage))
1158 GNUNET_break_op (0);
1161 gm = (const struct GetMessage*) message;
1162 type = ntohl (gm->type);
1163 bm = ntohl (gm->hash_bitmap);
1171 if (msize < sizeof (struct GetMessage) + bits * sizeof (GNUNET_HashCode))
1173 GNUNET_break_op (0);
1176 opt = (const GNUNET_HashCode*) &gm[1];
1177 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (GNUNET_HashCode);
1178 /* bfsize must be power of 2, check! */
1179 if (0 != ( (bfsize - 1) & bfsize))
1181 GNUNET_break_op (0);
1184 GSF_cover_query_count++;
1185 bm = ntohl (gm->hash_bitmap);
1187 cps = GNUNET_CONTAINER_multihashmap_get (cp_map,
1188 &other->hashPubKey);
1191 /* peer must have just disconnected */
1192 GNUNET_STATISTICS_update (GSF_stats,
1193 gettext_noop ("# requests dropped due to initiator not being connected"),
1198 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1199 cp = GNUNET_CONTAINER_multihashmap_get (cp_map,
1206 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1207 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1208 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
1209 GNUNET_i2s ((const struct GNUNET_PeerIdentity*) &opt[bits-1]));
1212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1213 "Failed to find peer `%4s' in connection set. Dropping query.\n",
1214 GNUNET_i2s (other));
1216 GNUNET_STATISTICS_update (GSF_stats,
1217 gettext_noop ("# requests dropped due to missing reverse route"),
1222 /* note that we can really only check load here since otherwise
1223 peers could find out that we are overloaded by not being
1224 disconnected after sending us a malformed query... */
1225 priority = bound_priority (ntohl (gm->priority), cps);
1229 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1230 "Dropping query from `%s', this peer is too busy.\n",
1231 GNUNET_i2s (other));
1236 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1237 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
1238 GNUNET_h2s (&gm->query),
1239 (unsigned int) type,
1243 namespace = (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE)) ? &opt[bits++] : NULL;
1244 if ( (type == GNUNET_BLOCK_TYPE_FS_SBLOCK) &&
1245 (namespace == NULL) )
1247 GNUNET_break_op (0);
1250 if ( (type != GNUNET_BLOCK_TYPE_FS_SBLOCK) &&
1251 (namespace != NULL) )
1253 GNUNET_break_op (0);
1256 target = (0 != (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? ((const struct GNUNET_PeerIdentity*) &opt[bits++]) : NULL;
1259 if ( (GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority)) ||
1260 (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1261 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value * 2 + GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)) )
1263 /* don't have BW to send to peer, or would likely take longer than we have for it,
1264 so at best indirect the query */
1266 options |= GSF_PRO_FORWARD_ONLY;
1267 spid = GNUNET_PEER_intern (other);
1269 ttl = bound_ttl (ntohl (gm->ttl), priority);
1270 /* decrement ttl (always) */
1271 ttl_decrement = 2 * TTL_DECREMENT +
1272 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1275 (((int32_t)(ttl - ttl_decrement)) > 0) )
1278 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1279 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1284 GNUNET_STATISTICS_update (GSF_stats,
1285 gettext_noop ("# requests dropped due TTL underflow"),
1288 /* integer underflow => drop (should be very rare)! */
1291 ttl -= ttl_decrement;
1293 /* test if the request already exists */
1294 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map,
1296 if (peerreq != NULL)
1299 prd = GSF_pending_request_get_data_ (pr);
1300 if ( (prd->type == type) &&
1301 ( (type != GNUNET_BLOCK_TYPE_FS_SBLOCK) ||
1302 (0 == memcmp (&prd->namespace,
1304 sizeof (GNUNET_HashCode))) ) )
1306 if (prd->ttl.abs_value >= GNUNET_TIME_absolute_get().abs_value + ttl)
1308 /* existing request has higher TTL, drop new one! */
1309 prd->priority += priority;
1311 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1312 "Have existing request with higher TTL, dropping new request.\n",
1313 GNUNET_i2s (other));
1315 GNUNET_STATISTICS_update (GSF_stats,
1316 gettext_noop ("# requests dropped due to higher-TTL request"),
1321 /* existing request has lower TTL, drop old one! */
1322 GNUNET_STATISTICS_update (GSF_stats,
1323 gettext_noop ("# P2P searches active"),
1326 priority += prd->priority;
1327 GSF_pending_request_cancel_ (pr);
1328 GNUNET_assert (GNUNET_YES ==
1329 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
1332 if (peerreq->kill_task != GNUNET_SCHEDULER_NO_TASK)
1334 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
1335 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
1337 GNUNET_free (peerreq);
1341 peerreq = GNUNET_malloc (sizeof (struct PeerRequest));
1343 pr = GSF_pending_request_create_ (options,
1348 (bfsize > 0) ? (const char*)&opt[bits] : NULL,
1350 ntohl (gm->filter_mutator),
1352 (uint32_t) priority,
1355 NULL, 0, /* replies_seen */
1358 GNUNET_assert (NULL != pr);
1360 GNUNET_break (GNUNET_OK ==
1361 GNUNET_CONTAINER_multihashmap_put (cp->request_map,
1364 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1365 GNUNET_STATISTICS_update (GSF_stats,
1366 gettext_noop ("# P2P query messages received and processed"),
1369 GNUNET_STATISTICS_update (GSF_stats,
1370 gettext_noop ("# P2P searches active"),
1378 * Function called if there has been a timeout trying to satisfy
1379 * a transmission request.
1381 * @param cls the 'struct GSF_PeerTransmitHandle' of the request
1382 * @param tc scheduler context
1385 peer_transmit_timeout (void *cls,
1386 const struct GNUNET_SCHEDULER_TaskContext *tc)
1388 struct GSF_PeerTransmitHandle *pth = cls;
1389 struct GSF_ConnectedPeer *cp;
1392 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1393 "Timeout trying to transmit to other peer\n");
1395 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1397 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1400 if (GNUNET_YES == pth->is_query)
1401 GNUNET_assert (0 < cp->ppd.pending_queries--);
1402 else if (GNUNET_NO == pth->is_query)
1403 GNUNET_assert (0 < cp->ppd.pending_replies--);
1404 GNUNET_LOAD_update (cp->ppd.transmission_delay,
1406 if (NULL != pth->cth)
1408 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1411 pth->gmc (pth->gmc_cls,
1413 GNUNET_assert (0 == pth->cth_in_progress);
1419 * Transmit a message to the given peer as soon as possible.
1420 * If the peer disconnects before the transmission can happen,
1421 * the callback is invoked with a 'NULL' buffer.
1423 * @param cp target peer
1424 * @param is_query is this a query (GNUNET_YES) or content (GNUNET_NO) or neither (GNUNET_SYSERR)
1425 * @param priority how important is this request?
1426 * @param timeout when does this request timeout (call gmc with error)
1427 * @param size number of bytes we would like to send to the peer
1428 * @param gmc function to call to get the message
1429 * @param gmc_cls closure for gmc
1430 * @return handle to cancel request
1432 struct GSF_PeerTransmitHandle *
1433 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
1436 struct GNUNET_TIME_Relative timeout,
1438 GSF_GetMessageCallback gmc,
1441 struct GSF_PeerTransmitHandle *pth;
1442 struct GSF_PeerTransmitHandle *pos;
1443 struct GSF_PeerTransmitHandle *prev;
1445 pth = GNUNET_malloc (sizeof (struct GSF_PeerTransmitHandle));
1446 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1447 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1449 pth->gmc_cls = gmc_cls;
1451 pth->is_query = is_query;
1452 pth->priority = priority;
1454 /* insertion sort (by priority, descending) */
1457 while ( (pos != NULL) &&
1458 (pos->priority > priority) )
1464 GNUNET_CONTAINER_DLL_insert (cp->pth_head,
1468 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head,
1472 if (GNUNET_YES == is_query)
1473 cp->ppd.pending_queries++;
1474 else if (GNUNET_NO == is_query)
1475 cp->ppd.pending_replies++;
1476 pth->timeout_task = GNUNET_SCHEDULER_add_delayed (timeout,
1477 &peer_transmit_timeout,
1479 schedule_transmission (pth);
1485 * Cancel an earlier request for transmission.
1487 * @param pth request to cancel
1490 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1492 struct GSF_ConnectedPeer *cp;
1494 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1496 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1497 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1499 if (NULL != pth->cth)
1501 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1505 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1508 if (GNUNET_YES == pth->is_query)
1509 GNUNET_assert (0 < cp->ppd.pending_queries--);
1510 else if (GNUNET_NO == pth->is_query)
1511 GNUNET_assert (0 < cp->ppd.pending_replies--);
1512 GNUNET_assert (0 == pth->cth_in_progress);
1518 * Report on receiving a reply; update the performance record of the given peer.
1520 * @param cp responding peer (will be updated)
1521 * @param request_time time at which the original query was transmitted
1522 * @param request_priority priority of the original request
1525 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1526 struct GNUNET_TIME_Absolute request_time,
1527 uint32_t request_priority)
1529 struct GNUNET_TIME_Relative delay;
1531 delay = GNUNET_TIME_absolute_get_duration (request_time);
1532 cp->ppd.avg_reply_delay.rel_value = (cp->ppd.avg_reply_delay.rel_value * (RUNAVG_DELAY_N-1) + delay.rel_value) / RUNAVG_DELAY_N;
1533 cp->ppd.avg_priority = (cp->ppd.avg_priority * (RUNAVG_DELAY_N-1) + request_priority) / RUNAVG_DELAY_N;
1538 * Report on receiving a reply in response to an initiating client.
1539 * Remember that this peer is good for this client.
1541 * @param cp responding peer (will be updated)
1542 * @param initiator_client local client on responsible for query
1545 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1546 struct GSF_LocalClient *initiator_client)
1548 cp->ppd.last_client_replies[cp->last_client_replies_woff++ % CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1553 * Report on receiving a reply in response to an initiating peer.
1554 * Remember that this peer is good for this initiating peer.
1556 * @param cp responding peer (will be updated)
1557 * @param initiator_peer other peer responsible for query
1560 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1561 const struct GSF_ConnectedPeer *initiator_peer)
1563 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE], -1);
1564 cp->ppd.last_p2p_replies[cp->last_p2p_replies_woff++ % P2P_SUCCESS_LIST_SIZE] = initiator_peer->ppd.pid;
1565 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1570 * Method called whenever a given peer has a status change.
1572 * @param cls closure
1573 * @param peer peer identity this notification is about
1574 * @param bandwidth_in available amount of inbound bandwidth
1575 * @param bandwidth_out available amount of outbound bandwidth
1576 * @param timeout absolute time when this peer will time out
1577 * unless we see some further activity from it
1578 * @param atsi status information
1581 GSF_peer_status_handler_ (void *cls,
1582 const struct GNUNET_PeerIdentity *peer,
1583 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
1584 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
1585 struct GNUNET_TIME_Absolute timeout,
1586 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1588 struct GSF_ConnectedPeer *cp;
1590 cp = GNUNET_CONTAINER_multihashmap_get (cp_map,
1592 GNUNET_assert (NULL != cp);
1593 update_atsi (cp, atsi);
1598 * Cancel all requests associated with the peer.
1601 * @param query hash code of the request
1602 * @param value the 'struct GSF_PendingRequest'
1603 * @return GNUNET_YES (continue to iterate)
1606 cancel_pending_request (void *cls,
1607 const GNUNET_HashCode *query,
1610 struct PeerRequest *peerreq = value;
1611 struct GSF_PendingRequest *pr = peerreq->pr;
1613 GSF_pending_request_cancel_ (pr);
1614 if (peerreq->kill_task != GNUNET_SCHEDULER_NO_TASK)
1616 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
1617 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
1619 GNUNET_free (peerreq);
1625 * A peer disconnected from us. Tear down the connected peer
1629 * @param peer identity of peer that connected
1632 GSF_peer_disconnect_handler_ (void *cls,
1633 const struct GNUNET_PeerIdentity *peer)
1635 struct GSF_ConnectedPeer *cp;
1636 struct GSF_PeerTransmitHandle *pth;
1637 struct GSF_DelayedHandle *dh;
1639 cp = GNUNET_CONTAINER_multihashmap_get (cp_map,
1642 return; /* must have been disconnect from core with
1643 'peer' == my_id, ignore */
1644 GNUNET_CONTAINER_multihashmap_remove (cp_map,
1647 if (NULL != cp->migration_pth)
1649 GSF_peer_transmit_cancel_ (cp->migration_pth);
1650 cp->migration_pth = NULL;
1652 if (NULL != cp->irc)
1654 GNUNET_CORE_peer_change_preference_cancel (cp->irc);
1657 if (GNUNET_SCHEDULER_NO_TASK != cp->irc_delay_task)
1659 GNUNET_SCHEDULER_cancel (cp->irc_delay_task);
1660 cp->irc_delay_task = GNUNET_SCHEDULER_NO_TASK;
1662 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1663 &cancel_pending_request,
1665 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1666 cp->request_map = NULL;
1667 GSF_plan_notify_peer_disconnect_ (cp);
1668 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1669 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1670 while (NULL != (pth = cp->pth_head))
1672 if (NULL != pth->cth)
1674 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1677 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1679 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1680 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1682 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1685 GNUNET_assert (0 == pth->cth_in_progress);
1688 while (NULL != (dh = cp->delayed_head))
1690 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
1693 GNUNET_SCHEDULER_cancel (dh->delay_task);
1694 GNUNET_free (dh->pm);
1697 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1698 if (GNUNET_SCHEDULER_NO_TASK != cp->mig_revive_task)
1700 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1701 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
1708 * Closure for 'call_iterator'.
1710 struct IterationContext
1713 * Function to call on each entry.
1715 GSF_ConnectedPeerIterator it;
1725 * Function that calls the callback for each peer.
1727 * @param cls the 'struct IterationContext*'
1728 * @param key identity of the peer
1729 * @param value the 'struct GSF_ConnectedPeer*'
1730 * @return GNUNET_YES to continue iteration
1733 call_iterator (void *cls,
1734 const GNUNET_HashCode *key,
1737 struct IterationContext *ic = cls;
1738 struct GSF_ConnectedPeer *cp = value;
1741 (const struct GNUNET_PeerIdentity*) key,
1749 * Iterate over all connected peers.
1751 * @param it function to call for each peer
1752 * @param it_cls closure for it
1755 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it,
1758 struct IterationContext ic;
1762 GNUNET_CONTAINER_multihashmap_iterate (cp_map,
1769 * Obtain the identity of a connected peer.
1771 * @param cp peer to reserve bandwidth from
1772 * @param id identity to set (written to)
1775 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1776 struct GNUNET_PeerIdentity *id)
1778 GNUNET_PEER_resolve (cp->ppd.pid,
1784 * Assemble a migration stop message for transmission.
1786 * @param cls the 'struct GSF_ConnectedPeer' to use
1787 * @param size number of bytes we're allowed to write to buf
1788 * @param buf where to copy the message
1789 * @return number of bytes copied to buf
1792 create_migration_stop_message (void *cls,
1796 struct GSF_ConnectedPeer *cp = cls;
1797 struct MigrationStopMessage msm;
1799 cp->migration_pth = NULL;
1802 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1803 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1804 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1805 msm.reserved = htonl (0);
1806 msm.duration = GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining (cp->last_migration_block));
1807 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1808 return sizeof (struct MigrationStopMessage);
1813 * Ask a peer to stop migrating data to us until the given point
1816 * @param cp peer to ask
1817 * @param block_time until when to block
1820 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1821 struct GNUNET_TIME_Relative block_time)
1823 if (GNUNET_TIME_absolute_get_remaining (cp->last_migration_block).rel_value > block_time.rel_value)
1826 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1827 "Migration already blocked for another %llu ms\n",
1828 (unsigned long long) GNUNET_TIME_absolute_get_remaining (cp->last_migration_block).rel_value);
1830 return; /* already blocked */
1833 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1834 "Asking to stop migration for %llu ms\n",
1835 (unsigned long long) block_time.rel_value);
1837 cp->last_migration_block = GNUNET_TIME_relative_to_absolute (block_time);
1838 if (cp->migration_pth != NULL)
1839 GSF_peer_transmit_cancel_ (cp->migration_pth);
1841 = GSF_peer_transmit_ (cp,
1844 GNUNET_TIME_UNIT_FOREVER_REL,
1845 sizeof (struct MigrationStopMessage),
1846 &create_migration_stop_message,
1852 * Write host-trust information to a file - flush the buffer entry!
1854 * @param cls closure, not used
1855 * @param key host identity
1856 * @param value the 'struct GSF_ConnectedPeer' to flush
1857 * @return GNUNET_OK to continue iteration
1860 flush_trust (void *cls,
1861 const GNUNET_HashCode *key,
1864 struct GSF_ConnectedPeer *cp = value;
1867 struct GNUNET_PeerIdentity pid;
1869 if (cp->ppd.trust == cp->disk_trust)
1870 return GNUNET_OK; /* unchanged */
1871 GNUNET_PEER_resolve (cp->ppd.pid,
1873 fn = get_trust_filename (&pid);
1874 if (cp->ppd.trust == 0)
1876 if ((0 != UNLINK (fn)) && (errno != ENOENT))
1877 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING |
1878 GNUNET_ERROR_TYPE_BULK, "unlink", fn);
1882 trust = htonl (cp->ppd.trust);
1883 if (sizeof(uint32_t) == GNUNET_DISK_fn_write (fn, &trust,
1885 GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE
1886 | GNUNET_DISK_PERM_GROUP_READ | GNUNET_DISK_PERM_OTHER_READ))
1887 cp->disk_trust = cp->ppd.trust;
1895 * Notify core about a preference we have for the given peer
1896 * (to allocate more resources towards it). The change will
1897 * be communicated the next time we reserve bandwidth with
1898 * core (not instantly).
1900 * @param cp peer to reserve bandwidth from
1901 * @param pref preference change
1904 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1907 cp->inc_preference += pref;
1912 * Call this method periodically to flush trust information to disk.
1914 * @param cls closure, not used
1915 * @param tc task context, not used
1918 cron_flush_trust (void *cls,
1919 const struct GNUNET_SCHEDULER_TaskContext *tc)
1924 GNUNET_CONTAINER_multihashmap_iterate (cp_map,
1929 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1931 GNUNET_SCHEDULER_add_delayed (TRUST_FLUSH_FREQ,
1938 * Initialize peer management subsystem.
1941 GSF_connected_peer_init_ ()
1943 cp_map = GNUNET_CONTAINER_multihashmap_create (128);
1944 GNUNET_assert (GNUNET_OK ==
1945 GNUNET_CONFIGURATION_get_value_filename (GSF_cfg,
1949 GNUNET_DISK_directory_create (trustDirectory);
1950 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1951 &cron_flush_trust, NULL);
1956 * Iterator to free peer entries.
1958 * @param cls closure, unused
1959 * @param key current key code
1960 * @param value value in the hash map (peer entry)
1961 * @return GNUNET_YES (we should continue to iterate)
1964 clean_peer (void *cls,
1965 const GNUNET_HashCode * key,
1968 GSF_peer_disconnect_handler_ (NULL,
1969 (const struct GNUNET_PeerIdentity*) key);
1975 * Shutdown peer management subsystem.
1978 GSF_connected_peer_done_ ()
1980 cron_flush_trust (NULL, NULL);
1981 GNUNET_CONTAINER_multihashmap_iterate (cp_map,
1984 GNUNET_CONTAINER_multihashmap_destroy (cp_map);
1986 GNUNET_free (trustDirectory);
1987 trustDirectory = NULL;
1992 * Iterator to remove references to LC entry.
1994 * @param cls the 'struct GSF_LocalClient*' to look for
1995 * @param key current key code
1996 * @param value value in the hash map (peer entry)
1997 * @return GNUNET_YES (we should continue to iterate)
2000 clean_local_client (void *cls,
2001 const GNUNET_HashCode * key,
2004 const struct GSF_LocalClient *lc = cls;
2005 struct GSF_ConnectedPeer *cp = value;
2008 for (i=0;i<CS2P_SUCCESS_LIST_SIZE;i++)
2009 if (cp->ppd.last_client_replies[i] == lc)
2010 cp->ppd.last_client_replies[i] = NULL;
2016 * Notification that a local client disconnected. Clean up all of our
2017 * references to the given handle.
2019 * @param lc handle to the local client (henceforth invalid)
2022 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
2025 return; /* already cleaned up */
2026 GNUNET_CONTAINER_multihashmap_iterate (cp_map,
2027 &clean_local_client,
2032 /* end of gnunet-service-fs_cp.c */