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.
10 GNUnet is distributed in the hope that it will be useful, but
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_assert (0 != cp->ppd.pid);
434 GNUNET_PEER_resolve (cp->ppd.pid,
436 if ( (GNUNET_YES == pth->is_query) &&
437 (GNUNET_YES != pth->was_reserved) )
439 /* query, need reservation */
440 if (GNUNET_YES != cp->did_reserve)
441 return; /* not ready */
442 cp->did_reserve = GNUNET_NO;
443 /* reservation already done! */
444 pth->was_reserved = GNUNET_YES;
445 ip = cp->inc_preference;
446 cp->inc_preference = 0;
447 cp->irc = GNUNET_CORE_peer_change_preference (GSF_core,
449 GNUNET_TIME_UNIT_FOREVER_REL,
450 GNUNET_BANDWIDTH_VALUE_MAX,
453 &core_reserve_callback,
456 GNUNET_assert (pth->cth == NULL);
457 pth->cth_in_progress++;
458 pth->cth = GNUNET_CORE_notify_transmit_ready (GSF_core,
461 GNUNET_TIME_absolute_get_remaining (pth->timeout),
464 &peer_transmit_ready_cb,
466 GNUNET_assert (0 < pth->cth_in_progress--);
471 * Core is ready to transmit to a peer, get the message.
473 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
474 * @param size number of bytes core is willing to take
475 * @param buf where to copy the message
476 * @return number of bytes copied to buf
479 peer_transmit_ready_cb (void *cls,
483 struct GSF_PeerTransmitHandle *pth = cls;
484 struct GSF_PeerTransmitHandle *pos;
485 struct GSF_ConnectedPeer *cp;
488 GNUNET_assert ( (NULL == buf) ||
489 (pth->size <= size) );
491 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
493 GNUNET_SCHEDULER_cancel (pth->timeout_task);
494 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
497 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
500 if (GNUNET_YES == pth->is_query)
502 cp->ppd.last_request_times[(cp->last_request_times_off++) % MAX_QUEUE_PER_PEER] = GNUNET_TIME_absolute_get ();
503 GNUNET_assert (0 < cp->ppd.pending_queries--);
505 else if (GNUNET_NO == pth->is_query)
507 GNUNET_assert (0 < cp->ppd.pending_replies--);
509 GNUNET_LOAD_update (cp->ppd.transmission_delay,
510 GNUNET_TIME_absolute_get_duration (pth->transmission_request_start_time).rel_value);
511 ret = pth->gmc (pth->gmc_cls,
513 GNUNET_assert (NULL == pth->cth);
514 for (pos = cp->pth_head; pos != NULL; pos = pos->next)
516 GNUNET_assert (pos != pth);
517 schedule_transmission (pos);
519 GNUNET_assert (pth->cth == NULL);
520 GNUNET_assert (pth->cth_in_progress == 0);
527 * (re)try to reserve bandwidth from the given peer.
529 * @param cls the 'struct GSF_ConnectedPeer' to reserve from
530 * @param tc scheduler context
533 retry_reservation (void *cls,
534 const struct GNUNET_SCHEDULER_TaskContext *tc)
536 struct GSF_ConnectedPeer *cp = cls;
538 struct GNUNET_PeerIdentity target;
540 GNUNET_PEER_resolve (cp->ppd.pid,
542 cp->irc_delay_task = GNUNET_SCHEDULER_NO_TASK;
543 ip = cp->inc_preference;
544 cp->inc_preference = 0;
545 cp->irc = GNUNET_CORE_peer_change_preference (GSF_core,
547 GNUNET_TIME_UNIT_FOREVER_REL,
548 GNUNET_BANDWIDTH_VALUE_MAX,
551 &core_reserve_callback,
557 * Function called by core upon success or failure of our bandwidth reservation request.
559 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
560 * @param peer identifies the peer
561 * @param bandwidth_out available amount of outbound bandwidth
562 * @param amount set to the amount that was actually reserved or unreserved;
563 * either the full requested amount or zero (no partial reservations)
564 * @param res_delay if the reservation could not be satisfied (amount was 0), how
565 * long should the client wait until re-trying?
566 * @param preference current traffic preference for the given peer
569 core_reserve_callback (void *cls,
570 const struct GNUNET_PeerIdentity *peer,
571 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
573 struct GNUNET_TIME_Relative res_delay,
576 struct GSF_ConnectedPeer *cp = cls;
577 struct GSF_PeerTransmitHandle *pth;
582 cp->irc_delay_task = GNUNET_SCHEDULER_add_delayed (res_delay,
587 cp->did_reserve = GNUNET_YES;
589 if ( (NULL != pth) &&
592 /* reservation success, try transmission now! */
593 pth->cth_in_progress++;
594 pth->cth = GNUNET_CORE_notify_transmit_ready (GSF_core,
597 GNUNET_TIME_absolute_get_remaining (pth->timeout),
600 &peer_transmit_ready_cb,
602 GNUNET_assert (0 < pth->cth_in_progress--);
608 * A peer connected to us. Setup the connected peer
611 * @param peer identity of peer that connected
612 * @param atsi performance data for the connection
613 * @return handle to connected peer entry
615 struct GSF_ConnectedPeer *
616 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
617 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
619 struct GSF_ConnectedPeer *cp;
623 cp = GNUNET_malloc (sizeof (struct GSF_ConnectedPeer));
624 cp->ppd.pid = GNUNET_PEER_intern (peer);
625 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
626 cp->irc = GNUNET_CORE_peer_change_preference (GSF_core,
628 GNUNET_TIME_UNIT_FOREVER_REL,
629 GNUNET_BANDWIDTH_VALUE_MAX,
632 &core_reserve_callback,
634 fn = get_trust_filename (peer);
635 if ((GNUNET_DISK_file_test (fn) == GNUNET_YES) &&
636 (sizeof (trust) == GNUNET_DISK_fn_read (fn, &trust, sizeof (trust))))
637 cp->disk_trust = cp->ppd.trust = ntohl (trust);
639 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128);
640 GNUNET_break (GNUNET_OK ==
641 GNUNET_CONTAINER_multihashmap_put (cp_map,
644 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
645 update_atsi (cp, atsi);
646 GSF_push_start_ (cp);
652 * It may be time to re-start migrating content to this
653 * peer. Check, and if so, restart migration.
655 * @param cls the 'struct GSF_ConnectedPeer'
656 * @param tc scheduler context
659 revive_migration (void *cls,
660 const struct GNUNET_SCHEDULER_TaskContext *tc)
662 struct GSF_ConnectedPeer *cp = cls;
663 struct GNUNET_TIME_Relative bt;
665 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
666 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
667 if (0 != bt.rel_value)
669 /* still time left... */
671 = GNUNET_SCHEDULER_add_delayed (bt,
676 GSF_push_start_ (cp);
681 * Get a handle for a connected peer.
683 * @param peer peer's identity
684 * @return NULL if the peer is not currently connected
686 struct GSF_ConnectedPeer *
687 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
689 if (NULL == cp_map) return NULL;
690 return GNUNET_CONTAINER_multihashmap_get (cp_map,
696 * Handle P2P "MIGRATION_STOP" message.
698 * @param cls closure, always NULL
699 * @param other the other peer involved (sender or receiver, NULL
700 * for loopback messages where we are both sender and receiver)
701 * @param message the actual message
702 * @param atsi performance information
703 * @return GNUNET_OK to keep the connection open,
704 * GNUNET_SYSERR to close it (signal serious error)
707 GSF_handle_p2p_migration_stop_ (void *cls,
708 const struct GNUNET_PeerIdentity *other,
709 const struct GNUNET_MessageHeader *message,
710 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
712 struct GSF_ConnectedPeer *cp;
713 const struct MigrationStopMessage *msm;
714 struct GNUNET_TIME_Relative bt;
716 msm = (const struct MigrationStopMessage*) message;
717 cp = GNUNET_CONTAINER_multihashmap_get (cp_map,
724 bt = GNUNET_TIME_relative_ntoh (msm->duration);
725 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
726 _("Migration of content to peer `%s' blocked for %llu ms\n"),
728 (unsigned long long) bt.rel_value);
729 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
730 if (cp->mig_revive_task == GNUNET_SCHEDULER_NO_TASK)
734 = GNUNET_SCHEDULER_add_delayed (bt,
738 update_atsi (cp, atsi);
744 * Copy reply and free put message.
746 * @param cls the 'struct PutMessage'
747 * @param buf_size number of bytes available in buf
748 * @param buf where to copy the message, NULL on error (peer disconnect)
749 * @return number of bytes copied to 'buf', can be 0 (without indicating an error)
752 copy_reply (void *cls,
756 struct PutMessage *pm = cls;
761 GNUNET_assert (buf_size >= ntohs (pm->header.size));
762 size = ntohs (pm->header.size);
763 memcpy (buf, pm, size);
764 GNUNET_STATISTICS_update (GSF_stats,
765 gettext_noop ("# replies transmitted to other peers"),
772 GNUNET_STATISTICS_update (GSF_stats,
773 gettext_noop ("# replies dropped"),
783 * Cancel all requests associated with the peer.
786 * @param query hash code of the request
787 * @param value the 'struct GSF_PendingRequest'
788 * @return GNUNET_YES (continue to iterate)
791 cancel_pending_request (void *cls,
792 const GNUNET_HashCode *query,
795 struct PeerRequest *peerreq = value;
796 struct GSF_PendingRequest *pr = peerreq->pr;
797 struct GSF_ConnectedPeer *cp = peerreq->cp;
798 struct GSF_PendingRequestData *prd;
800 if (peerreq->kill_task != GNUNET_SCHEDULER_NO_TASK)
802 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
803 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
805 GNUNET_STATISTICS_update (GSF_stats,
806 gettext_noop ("# P2P searches active"),
809 prd = GSF_pending_request_get_data_ (pr);
810 GNUNET_break (GNUNET_OK ==
811 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
814 GSF_pending_request_cancel_ (pr);
815 GNUNET_free (peerreq);
821 * Free the given request.
823 * @param cls the request to free
824 * @param tc task context
827 peer_request_destroy (void *cls,
828 const struct GNUNET_SCHEDULER_TaskContext *tc)
830 struct PeerRequest *peerreq = cls;
831 struct GSF_PendingRequest *pr = peerreq->pr;
832 struct GSF_PendingRequestData *prd;
834 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
835 prd = GSF_pending_request_get_data_ (pr);
836 cancel_pending_request (NULL,
843 * The artificial delay is over, transmit the message now.
845 * @param cls the 'struct GSF_DelayedHandle' with the message
846 * @param tc scheduler context
849 transmit_delayed_now (void *cls,
850 const struct GNUNET_SCHEDULER_TaskContext *tc)
852 struct GSF_DelayedHandle *dh = cls;
853 struct GSF_ConnectedPeer *cp = dh->cp;
855 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
858 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
860 GNUNET_free (dh->pm);
864 (void) GSF_peer_transmit_ (cp, GNUNET_NO,
875 * Get the randomized delay a response should be subjected to.
877 * @return desired delay
879 static struct GNUNET_TIME_Relative
880 get_randomized_delay ()
882 struct GNUNET_TIME_Relative ret;
884 /* FIXME: replace 5000 with something relating to current observed P2P message latency */
885 ret = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
886 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
888 GNUNET_STATISTICS_update (GSF_stats,
889 gettext_noop ("# artificial delays introduced (ms)"),
898 * Handle a reply to a pending request. Also called if a request
899 * expires (then with data == NULL). The handler may be called
900 * many times (depending on the request type), but will not be
901 * called during or after a call to GSF_pending_request_cancel
902 * and will also not be called anymore after a call signalling
905 * @param cls 'struct PeerRequest' this is an answer for
906 * @param eval evaluation of the result
907 * @param pr handle to the original pending request
908 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
909 * @param expiration when does 'data' expire?
910 * @param type type of the block
911 * @param data response data, NULL on request expiration
912 * @param data_len number of bytes in data
915 handle_p2p_reply (void *cls,
916 enum GNUNET_BLOCK_EvaluationResult eval,
917 struct GSF_PendingRequest *pr,
918 uint32_t reply_anonymity_level,
919 struct GNUNET_TIME_Absolute expiration,
920 enum GNUNET_BLOCK_Type type,
924 struct PeerRequest *peerreq = cls;
925 struct GSF_ConnectedPeer *cp = peerreq->cp;
926 struct GSF_PendingRequestData *prd;
927 struct PutMessage *pm;
930 GNUNET_assert (data_len + sizeof (struct PutMessage) < GNUNET_SERVER_MAX_MESSAGE_SIZE);
931 GNUNET_assert (peerreq->pr == pr);
932 prd = GSF_pending_request_get_data_ (pr);
935 GNUNET_STATISTICS_update (GSF_stats,
936 gettext_noop ("# P2P searches active"),
939 GNUNET_break (GNUNET_OK ==
940 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
943 GNUNET_free (peerreq);
946 GNUNET_break (type != GNUNET_BLOCK_TYPE_ANY);
947 if ( (prd->type != type) &&
948 (prd->type != GNUNET_BLOCK_TYPE_ANY) )
954 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
955 "Transmitting result for query `%s' to peer\n",
956 GNUNET_h2s (&prd->query));
958 GNUNET_STATISTICS_update (GSF_stats,
959 gettext_noop ("# replies received for other peers"),
962 msize = sizeof (struct PutMessage) + data_len;
963 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
968 if ( (reply_anonymity_level != UINT32_MAX) &&
969 (reply_anonymity_level > 1) )
971 if (reply_anonymity_level - 1 > GSF_cover_content_count)
973 GNUNET_STATISTICS_update (GSF_stats,
974 gettext_noop ("# replies dropped due to insufficient cover traffic"),
979 GSF_cover_content_count -= (reply_anonymity_level - 1);
982 pm = GNUNET_malloc (msize);
983 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
984 pm->header.size = htons (msize);
985 pm->type = htonl (type);
986 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
987 memcpy (&pm[1], data, data_len);
988 if ( (reply_anonymity_level != UINT32_MAX) &&
989 (reply_anonymity_level != 0) &&
990 (GSF_enable_randomized_delays == GNUNET_YES) )
992 struct GSF_DelayedHandle *dh;
994 dh = GNUNET_malloc (sizeof (struct GSF_DelayedHandle));
998 GNUNET_CONTAINER_DLL_insert (cp->delayed_head,
1001 dh->delay_task = GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
1002 &transmit_delayed_now,
1007 (void) GSF_peer_transmit_ (cp, GNUNET_NO,
1014 if (eval != GNUNET_BLOCK_EVALUATION_OK_LAST)
1016 if (GNUNET_SCHEDULER_NO_TASK == peerreq->kill_task)
1018 GNUNET_STATISTICS_update (GSF_stats,
1019 gettext_noop ("# P2P searches destroyed due to ultimate reply"),
1022 peerreq->kill_task = GNUNET_SCHEDULER_add_now (&peer_request_destroy,
1029 * Increase the host credit by a value.
1031 * @param cp which peer to change the trust value on
1032 * @param value is the int value by which the
1033 * host credit is to be increased or decreased
1034 * @returns the actual change in trust (positive or negative)
1037 change_host_trust (struct GSF_ConnectedPeer *cp, int value)
1041 GNUNET_assert (cp != NULL);
1044 if (cp->ppd.trust + value < cp->ppd.trust)
1046 value = UINT32_MAX - cp->ppd.trust;
1047 cp->ppd.trust = UINT32_MAX;
1050 cp->ppd.trust += value;
1054 if (cp->ppd.trust < -value)
1056 value = -cp->ppd.trust;
1060 cp->ppd.trust += value;
1067 * We've received a request with the specified priority. Bound it
1068 * according to how much we trust the given peer.
1070 * @param prio_in requested priority
1071 * @param cp the peer making the request
1072 * @return effective priority
1075 bound_priority (uint32_t prio_in,
1076 struct GSF_ConnectedPeer *cp)
1078 #define N ((double)128.0)
1083 ld = GSF_test_get_load_too_high_ (0);
1084 if (ld == GNUNET_SYSERR)
1086 GNUNET_STATISTICS_update (GSF_stats,
1087 gettext_noop ("# requests done for free (low load)"),
1090 return 0; /* excess resources */
1092 if (prio_in > INT32_MAX)
1093 prio_in = INT32_MAX;
1094 ret = - change_host_trust (cp, - (int) prio_in);
1097 if (ret > GSF_current_priorities + N)
1098 rret = GSF_current_priorities + N;
1101 GSF_current_priorities
1102 = (GSF_current_priorities * (N-1) + rret)/N;
1104 if ( (ld == GNUNET_YES) && (ret > 0) )
1106 /* try with charging */
1107 ld = GSF_test_get_load_too_high_ (ret);
1109 if (ld == GNUNET_YES)
1111 GNUNET_STATISTICS_update (GSF_stats,
1112 gettext_noop ("# request dropped, priority insufficient"),
1116 change_host_trust (cp, (int) ret);
1117 return -1; /* not enough resources */
1121 GNUNET_STATISTICS_update (GSF_stats,
1122 gettext_noop ("# requests done for a price (normal load)"),
1132 * The priority level imposes a bound on the maximum
1133 * value for the ttl that can be requested.
1135 * @param ttl_in requested ttl
1136 * @param prio given priority
1137 * @return ttl_in if ttl_in is below the limit,
1138 * otherwise the ttl-limit for the given priority
1141 bound_ttl (int32_t ttl_in, uint32_t prio)
1143 unsigned long long allowed;
1147 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1148 if (ttl_in > allowed)
1150 if (allowed >= (1 << 30))
1159 * Handle P2P "QUERY" message. Creates the pending request entry
1160 * and sets up all of the data structures to that we will
1161 * process replies properly. Does not initiate forwarding or
1162 * local database lookups.
1164 * @param other the other peer involved (sender or receiver, NULL
1165 * for loopback messages where we are both sender and receiver)
1166 * @param message the actual message
1167 * @return pending request handle, NULL on error
1169 struct GSF_PendingRequest *
1170 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1171 const struct GNUNET_MessageHeader *message)
1173 struct PeerRequest *peerreq;
1174 struct GSF_PendingRequest *pr;
1175 struct GSF_PendingRequestData *prd;
1176 struct GSF_ConnectedPeer *cp;
1177 struct GSF_ConnectedPeer *cps;
1178 const GNUNET_HashCode *namespace;
1179 const struct GNUNET_PeerIdentity *target;
1180 enum GSF_PendingRequestOptions options;
1182 const struct GetMessage *gm;
1184 const GNUNET_HashCode *opt;
1187 uint32_t ttl_decrement;
1190 enum GNUNET_BLOCK_Type type;
1191 GNUNET_PEER_Id spid;
1193 GNUNET_assert (other != NULL);
1194 msize = ntohs(message->size);
1195 if (msize < sizeof (struct GetMessage))
1197 GNUNET_break_op (0);
1200 GNUNET_STATISTICS_update (GSF_stats,
1201 gettext_noop ("# GET requests received (from other peers)"),
1204 gm = (const struct GetMessage*) message;
1205 type = ntohl (gm->type);
1206 bm = ntohl (gm->hash_bitmap);
1214 if (msize < sizeof (struct GetMessage) + bits * sizeof (GNUNET_HashCode))
1216 GNUNET_break_op (0);
1219 opt = (const GNUNET_HashCode*) &gm[1];
1220 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (GNUNET_HashCode);
1221 /* bfsize must be power of 2, check! */
1222 if (0 != ( (bfsize - 1) & bfsize))
1224 GNUNET_break_op (0);
1227 GSF_cover_query_count++;
1228 bm = ntohl (gm->hash_bitmap);
1230 cps = GNUNET_CONTAINER_multihashmap_get (cp_map,
1231 &other->hashPubKey);
1234 /* peer must have just disconnected */
1235 GNUNET_STATISTICS_update (GSF_stats,
1236 gettext_noop ("# requests dropped due to initiator not being connected"),
1241 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1242 cp = GNUNET_CONTAINER_multihashmap_get (cp_map,
1249 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1250 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1251 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
1252 GNUNET_i2s ((const struct GNUNET_PeerIdentity*) &opt[bits-1]));
1255 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1256 "Failed to find peer `%4s' in connection set. Dropping query.\n",
1257 GNUNET_i2s (other));
1259 GNUNET_STATISTICS_update (GSF_stats,
1260 gettext_noop ("# requests dropped due to missing reverse route"),
1265 /* note that we can really only check load here since otherwise
1266 peers could find out that we are overloaded by not being
1267 disconnected after sending us a malformed query... */
1268 priority = bound_priority (ntohl (gm->priority), cps);
1272 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1273 "Dropping query from `%s', this peer is too busy.\n",
1274 GNUNET_i2s (other));
1279 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1280 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
1281 GNUNET_h2s (&gm->query),
1282 (unsigned int) type,
1286 namespace = (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE)) ? &opt[bits++] : NULL;
1287 if ( (type == GNUNET_BLOCK_TYPE_FS_SBLOCK) &&
1288 (namespace == NULL) )
1290 GNUNET_break_op (0);
1293 if ( (type != GNUNET_BLOCK_TYPE_FS_SBLOCK) &&
1294 (namespace != NULL) )
1296 GNUNET_break_op (0);
1299 target = (0 != (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? ((const struct GNUNET_PeerIdentity*) &opt[bits++]) : NULL;
1302 if ( (GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority)) ||
1303 (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1304 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value * 2 + GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)) )
1306 /* don't have BW to send to peer, or would likely take longer than we have for it,
1307 so at best indirect the query */
1309 options |= GSF_PRO_FORWARD_ONLY;
1310 spid = GNUNET_PEER_intern (other);
1311 GNUNET_assert (0 != spid);
1313 ttl = bound_ttl (ntohl (gm->ttl), priority);
1314 /* decrement ttl (always) */
1315 ttl_decrement = 2 * TTL_DECREMENT +
1316 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1319 (((int32_t)(ttl - ttl_decrement)) > 0) )
1322 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1323 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1328 GNUNET_STATISTICS_update (GSF_stats,
1329 gettext_noop ("# requests dropped due TTL underflow"),
1332 /* integer underflow => drop (should be very rare)! */
1335 ttl -= ttl_decrement;
1337 /* test if the request already exists */
1338 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map,
1340 if (peerreq != NULL)
1343 prd = GSF_pending_request_get_data_ (pr);
1344 if ( (prd->type == type) &&
1345 ( (type != GNUNET_BLOCK_TYPE_FS_SBLOCK) ||
1346 (0 == memcmp (&prd->namespace,
1348 sizeof (GNUNET_HashCode))) ) )
1350 if (prd->ttl.abs_value >= GNUNET_TIME_absolute_get().abs_value + ttl)
1352 /* existing request has higher TTL, drop new one! */
1353 prd->priority += priority;
1355 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1356 "Have existing request with higher TTL, dropping new request.\n",
1357 GNUNET_i2s (other));
1359 GNUNET_STATISTICS_update (GSF_stats,
1360 gettext_noop ("# requests dropped due to higher-TTL request"),
1365 /* existing request has lower TTL, drop old one! */
1366 GNUNET_STATISTICS_update (GSF_stats,
1367 gettext_noop ("# P2P searches active"),
1370 priority += prd->priority;
1371 GSF_pending_request_cancel_ (pr);
1372 GNUNET_assert (GNUNET_YES ==
1373 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
1376 if (peerreq->kill_task != GNUNET_SCHEDULER_NO_TASK)
1378 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
1379 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
1381 GNUNET_free (peerreq);
1385 peerreq = GNUNET_malloc (sizeof (struct PeerRequest));
1387 pr = GSF_pending_request_create_ (options,
1392 (bfsize > 0) ? (const char*)&opt[bits] : NULL,
1394 ntohl (gm->filter_mutator),
1396 (uint32_t) priority,
1399 NULL, 0, /* replies_seen */
1402 GNUNET_assert (NULL != pr);
1404 GNUNET_break (GNUNET_OK ==
1405 GNUNET_CONTAINER_multihashmap_put (cp->request_map,
1408 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1409 GNUNET_STATISTICS_update (GSF_stats,
1410 gettext_noop ("# P2P query messages received and processed"),
1413 GNUNET_STATISTICS_update (GSF_stats,
1414 gettext_noop ("# P2P searches active"),
1422 * Function called if there has been a timeout trying to satisfy
1423 * a transmission request.
1425 * @param cls the 'struct GSF_PeerTransmitHandle' of the request
1426 * @param tc scheduler context
1429 peer_transmit_timeout (void *cls,
1430 const struct GNUNET_SCHEDULER_TaskContext *tc)
1432 struct GSF_PeerTransmitHandle *pth = cls;
1433 struct GSF_ConnectedPeer *cp;
1436 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1437 "Timeout trying to transmit to other peer\n");
1439 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1441 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1444 if (GNUNET_YES == pth->is_query)
1445 GNUNET_assert (0 < cp->ppd.pending_queries--);
1446 else if (GNUNET_NO == pth->is_query)
1447 GNUNET_assert (0 < cp->ppd.pending_replies--);
1448 GNUNET_LOAD_update (cp->ppd.transmission_delay,
1450 if (NULL != pth->cth)
1452 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1455 pth->gmc (pth->gmc_cls,
1457 GNUNET_assert (0 == pth->cth_in_progress);
1463 * Transmit a message to the given peer as soon as possible.
1464 * If the peer disconnects before the transmission can happen,
1465 * the callback is invoked with a 'NULL' buffer.
1467 * @param cp target peer
1468 * @param is_query is this a query (GNUNET_YES) or content (GNUNET_NO) or neither (GNUNET_SYSERR)
1469 * @param priority how important is this request?
1470 * @param timeout when does this request timeout (call gmc with error)
1471 * @param size number of bytes we would like to send to the peer
1472 * @param gmc function to call to get the message
1473 * @param gmc_cls closure for gmc
1474 * @return handle to cancel request
1476 struct GSF_PeerTransmitHandle *
1477 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
1480 struct GNUNET_TIME_Relative timeout,
1482 GSF_GetMessageCallback gmc,
1485 struct GSF_PeerTransmitHandle *pth;
1486 struct GSF_PeerTransmitHandle *pos;
1487 struct GSF_PeerTransmitHandle *prev;
1489 pth = GNUNET_malloc (sizeof (struct GSF_PeerTransmitHandle));
1490 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1491 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1493 pth->gmc_cls = gmc_cls;
1495 pth->is_query = is_query;
1496 pth->priority = priority;
1498 /* insertion sort (by priority, descending) */
1501 while ( (pos != NULL) &&
1502 (pos->priority > priority) )
1508 GNUNET_CONTAINER_DLL_insert (cp->pth_head,
1512 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head,
1516 if (GNUNET_YES == is_query)
1517 cp->ppd.pending_queries++;
1518 else if (GNUNET_NO == is_query)
1519 cp->ppd.pending_replies++;
1520 pth->timeout_task = GNUNET_SCHEDULER_add_delayed (timeout,
1521 &peer_transmit_timeout,
1523 schedule_transmission (pth);
1529 * Cancel an earlier request for transmission.
1531 * @param pth request to cancel
1534 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1536 struct GSF_ConnectedPeer *cp;
1538 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1540 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1541 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1543 if (NULL != pth->cth)
1545 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1549 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1552 if (GNUNET_YES == pth->is_query)
1553 GNUNET_assert (0 < cp->ppd.pending_queries--);
1554 else if (GNUNET_NO == pth->is_query)
1555 GNUNET_assert (0 < cp->ppd.pending_replies--);
1556 GNUNET_assert (0 == pth->cth_in_progress);
1562 * Report on receiving a reply; update the performance record of the given peer.
1564 * @param cp responding peer (will be updated)
1565 * @param request_time time at which the original query was transmitted
1566 * @param request_priority priority of the original request
1569 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1570 struct GNUNET_TIME_Absolute request_time,
1571 uint32_t request_priority)
1573 struct GNUNET_TIME_Relative delay;
1575 delay = GNUNET_TIME_absolute_get_duration (request_time);
1576 cp->ppd.avg_reply_delay.rel_value = (cp->ppd.avg_reply_delay.rel_value * (RUNAVG_DELAY_N-1) + delay.rel_value) / RUNAVG_DELAY_N;
1577 cp->ppd.avg_priority = (cp->ppd.avg_priority * (RUNAVG_DELAY_N-1) + request_priority) / RUNAVG_DELAY_N;
1582 * Report on receiving a reply in response to an initiating client.
1583 * Remember that this peer is good for this client.
1585 * @param cp responding peer (will be updated)
1586 * @param initiator_client local client on responsible for query
1589 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1590 struct GSF_LocalClient *initiator_client)
1592 cp->ppd.last_client_replies[cp->last_client_replies_woff++ % CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1597 * Report on receiving a reply in response to an initiating peer.
1598 * Remember that this peer is good for this initiating peer.
1600 * @param cp responding peer (will be updated)
1601 * @param initiator_peer other peer responsible for query
1604 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1605 const struct GSF_ConnectedPeer *initiator_peer)
1607 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE], -1);
1608 cp->ppd.last_p2p_replies[cp->last_p2p_replies_woff++ % P2P_SUCCESS_LIST_SIZE] = initiator_peer->ppd.pid;
1609 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1614 * Method called whenever a given peer has a status change.
1616 * @param cls closure
1617 * @param peer peer identity this notification is about
1618 * @param bandwidth_in available amount of inbound bandwidth
1619 * @param bandwidth_out available amount of outbound bandwidth
1620 * @param timeout absolute time when this peer will time out
1621 * unless we see some further activity from it
1622 * @param atsi status information
1625 GSF_peer_status_handler_ (void *cls,
1626 const struct GNUNET_PeerIdentity *peer,
1627 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
1628 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
1629 struct GNUNET_TIME_Absolute timeout,
1630 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1632 struct GSF_ConnectedPeer *cp;
1634 cp = GNUNET_CONTAINER_multihashmap_get (cp_map,
1636 GNUNET_assert (NULL != cp);
1637 update_atsi (cp, atsi);
1642 * A peer disconnected from us. Tear down the connected peer
1646 * @param peer identity of peer that connected
1649 GSF_peer_disconnect_handler_ (void *cls,
1650 const struct GNUNET_PeerIdentity *peer)
1652 struct GSF_ConnectedPeer *cp;
1653 struct GSF_PeerTransmitHandle *pth;
1654 struct GSF_DelayedHandle *dh;
1656 cp = GNUNET_CONTAINER_multihashmap_get (cp_map,
1659 return; /* must have been disconnect from core with
1660 'peer' == my_id, ignore */
1661 GNUNET_CONTAINER_multihashmap_remove (cp_map,
1664 if (NULL != cp->migration_pth)
1666 GSF_peer_transmit_cancel_ (cp->migration_pth);
1667 cp->migration_pth = NULL;
1669 if (NULL != cp->irc)
1671 GNUNET_CORE_peer_change_preference_cancel (cp->irc);
1674 if (GNUNET_SCHEDULER_NO_TASK != cp->irc_delay_task)
1676 GNUNET_SCHEDULER_cancel (cp->irc_delay_task);
1677 cp->irc_delay_task = GNUNET_SCHEDULER_NO_TASK;
1679 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1680 &cancel_pending_request,
1682 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1683 cp->request_map = NULL;
1684 GSF_plan_notify_peer_disconnect_ (cp);
1685 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1686 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1687 GSF_push_stop_ (cp);
1688 while (NULL != (pth = cp->pth_head))
1690 if (NULL != pth->cth)
1692 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1695 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1697 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1698 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1700 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1703 GNUNET_assert (0 == pth->cth_in_progress);
1704 pth->gmc (pth->gmc_cls,
1708 while (NULL != (dh = cp->delayed_head))
1710 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
1713 GNUNET_SCHEDULER_cancel (dh->delay_task);
1714 GNUNET_free (dh->pm);
1717 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1718 if (GNUNET_SCHEDULER_NO_TASK != cp->mig_revive_task)
1720 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1721 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
1728 * Closure for 'call_iterator'.
1730 struct IterationContext
1733 * Function to call on each entry.
1735 GSF_ConnectedPeerIterator it;
1745 * Function that calls the callback for each peer.
1747 * @param cls the 'struct IterationContext*'
1748 * @param key identity of the peer
1749 * @param value the 'struct GSF_ConnectedPeer*'
1750 * @return GNUNET_YES to continue iteration
1753 call_iterator (void *cls,
1754 const GNUNET_HashCode *key,
1757 struct IterationContext *ic = cls;
1758 struct GSF_ConnectedPeer *cp = value;
1761 (const struct GNUNET_PeerIdentity*) key,
1769 * Iterate over all connected peers.
1771 * @param it function to call for each peer
1772 * @param it_cls closure for it
1775 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it,
1778 struct IterationContext ic;
1782 GNUNET_CONTAINER_multihashmap_iterate (cp_map,
1789 * Obtain the identity of a connected peer.
1791 * @param cp peer to reserve bandwidth from
1792 * @param id identity to set (written to)
1795 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1796 struct GNUNET_PeerIdentity *id)
1798 GNUNET_assert (0 != cp->ppd.pid);
1799 GNUNET_PEER_resolve (cp->ppd.pid,
1805 * Assemble a migration stop message for transmission.
1807 * @param cls the 'struct GSF_ConnectedPeer' to use
1808 * @param size number of bytes we're allowed to write to buf
1809 * @param buf where to copy the message
1810 * @return number of bytes copied to buf
1813 create_migration_stop_message (void *cls,
1817 struct GSF_ConnectedPeer *cp = cls;
1818 struct MigrationStopMessage msm;
1820 cp->migration_pth = NULL;
1823 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1824 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1825 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1826 msm.reserved = htonl (0);
1827 msm.duration = GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining (cp->last_migration_block));
1828 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1829 return sizeof (struct MigrationStopMessage);
1834 * Ask a peer to stop migrating data to us until the given point
1837 * @param cp peer to ask
1838 * @param block_time until when to block
1841 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1842 struct GNUNET_TIME_Relative block_time)
1844 if (GNUNET_TIME_absolute_get_remaining (cp->last_migration_block).rel_value > block_time.rel_value)
1847 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1848 "Migration already blocked for another %llu ms\n",
1849 (unsigned long long) GNUNET_TIME_absolute_get_remaining (cp->last_migration_block).rel_value);
1851 return; /* already blocked */
1854 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1855 "Asking to stop migration for %llu ms\n",
1856 (unsigned long long) block_time.rel_value);
1858 cp->last_migration_block = GNUNET_TIME_relative_to_absolute (block_time);
1859 if (cp->migration_pth != NULL)
1860 GSF_peer_transmit_cancel_ (cp->migration_pth);
1862 = GSF_peer_transmit_ (cp,
1865 GNUNET_TIME_UNIT_FOREVER_REL,
1866 sizeof (struct MigrationStopMessage),
1867 &create_migration_stop_message,
1873 * Write host-trust information to a file - flush the buffer entry!
1875 * @param cls closure, not used
1876 * @param key host identity
1877 * @param value the 'struct GSF_ConnectedPeer' to flush
1878 * @return GNUNET_OK to continue iteration
1881 flush_trust (void *cls,
1882 const GNUNET_HashCode *key,
1885 struct GSF_ConnectedPeer *cp = value;
1888 struct GNUNET_PeerIdentity pid;
1890 if (cp->ppd.trust == cp->disk_trust)
1891 return GNUNET_OK; /* unchanged */
1892 GNUNET_assert (0 != cp->ppd.pid);
1893 GNUNET_PEER_resolve (cp->ppd.pid,
1895 fn = get_trust_filename (&pid);
1896 if (cp->ppd.trust == 0)
1898 if ((0 != UNLINK (fn)) && (errno != ENOENT))
1899 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING |
1900 GNUNET_ERROR_TYPE_BULK, "unlink", fn);
1904 trust = htonl (cp->ppd.trust);
1905 if (sizeof(uint32_t) == GNUNET_DISK_fn_write (fn, &trust,
1907 GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE
1908 | GNUNET_DISK_PERM_GROUP_READ | GNUNET_DISK_PERM_OTHER_READ))
1909 cp->disk_trust = cp->ppd.trust;
1917 * Notify core about a preference we have for the given peer
1918 * (to allocate more resources towards it). The change will
1919 * be communicated the next time we reserve bandwidth with
1920 * core (not instantly).
1922 * @param cp peer to reserve bandwidth from
1923 * @param pref preference change
1926 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1929 cp->inc_preference += pref;
1934 * Call this method periodically to flush trust information to disk.
1936 * @param cls closure, not used
1937 * @param tc task context, not used
1940 cron_flush_trust (void *cls,
1941 const struct GNUNET_SCHEDULER_TaskContext *tc)
1946 GNUNET_CONTAINER_multihashmap_iterate (cp_map,
1951 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1953 GNUNET_SCHEDULER_add_delayed (TRUST_FLUSH_FREQ,
1960 * Initialize peer management subsystem.
1963 GSF_connected_peer_init_ ()
1965 cp_map = GNUNET_CONTAINER_multihashmap_create (128);
1966 GNUNET_assert (GNUNET_OK ==
1967 GNUNET_CONFIGURATION_get_value_filename (GSF_cfg,
1971 GNUNET_DISK_directory_create (trustDirectory);
1972 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1973 &cron_flush_trust, NULL);
1978 * Iterator to free peer entries.
1980 * @param cls closure, unused
1981 * @param key current key code
1982 * @param value value in the hash map (peer entry)
1983 * @return GNUNET_YES (we should continue to iterate)
1986 clean_peer (void *cls,
1987 const GNUNET_HashCode * key,
1990 GSF_peer_disconnect_handler_ (NULL,
1991 (const struct GNUNET_PeerIdentity*) key);
1997 * Shutdown peer management subsystem.
2000 GSF_connected_peer_done_ ()
2002 cron_flush_trust (NULL, NULL);
2003 GNUNET_CONTAINER_multihashmap_iterate (cp_map,
2006 GNUNET_CONTAINER_multihashmap_destroy (cp_map);
2008 GNUNET_free (trustDirectory);
2009 trustDirectory = NULL;
2014 * Iterator to remove references to LC entry.
2016 * @param cls the 'struct GSF_LocalClient*' to look for
2017 * @param key current key code
2018 * @param value value in the hash map (peer entry)
2019 * @return GNUNET_YES (we should continue to iterate)
2022 clean_local_client (void *cls,
2023 const GNUNET_HashCode * key,
2026 const struct GSF_LocalClient *lc = cls;
2027 struct GSF_ConnectedPeer *cp = value;
2030 for (i=0;i<CS2P_SUCCESS_LIST_SIZE;i++)
2031 if (cp->ppd.last_client_replies[i] == lc)
2032 cp->ppd.last_client_replies[i] = NULL;
2038 * Notification that a local client disconnected. Clean up all of our
2039 * references to the given handle.
2041 * @param lc handle to the local client (henceforth invalid)
2044 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
2047 return; /* already cleaned up */
2048 GNUNET_CONTAINER_multihashmap_iterate (cp_map,
2049 &clean_local_client,
2054 /* end of gnunet-service-fs_cp.c */