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_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 * Cancel all requests associated with the peer.
784 * @param query hash code of the request
785 * @param value the 'struct GSF_PendingRequest'
786 * @return GNUNET_YES (continue to iterate)
789 cancel_pending_request (void *cls,
790 const GNUNET_HashCode *query,
793 struct PeerRequest *peerreq = value;
794 struct GSF_PendingRequest *pr = peerreq->pr;
795 struct GSF_ConnectedPeer *cp = peerreq->cp;
796 struct GSF_PendingRequestData *prd;
798 if (peerreq->kill_task != GNUNET_SCHEDULER_NO_TASK)
800 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
801 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
803 GNUNET_STATISTICS_update (GSF_stats,
804 gettext_noop ("# P2P searches active"),
807 prd = GSF_pending_request_get_data_ (pr);
808 GNUNET_break (GNUNET_OK ==
809 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
812 GSF_pending_request_cancel_ (pr);
813 GNUNET_free (peerreq);
819 * Free the given request.
821 * @param cls the request to free
822 * @param tc task context
825 peer_request_destroy (void *cls,
826 const struct GNUNET_SCHEDULER_TaskContext *tc)
828 struct PeerRequest *peerreq = cls;
829 struct GSF_PendingRequest *pr = peerreq->pr;
830 struct GSF_PendingRequestData *prd;
832 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
833 prd = GSF_pending_request_get_data_ (pr);
834 cancel_pending_request (NULL,
841 * The artificial delay is over, transmit the message now.
843 * @param cls the 'struct GSF_DelayedHandle' with the message
844 * @param tc scheduler context
847 transmit_delayed_now (void *cls,
848 const struct GNUNET_SCHEDULER_TaskContext *tc)
850 struct GSF_DelayedHandle *dh = cls;
851 struct GSF_ConnectedPeer *cp = dh->cp;
853 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
856 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
858 GNUNET_free (dh->pm);
862 (void) GSF_peer_transmit_ (cp, GNUNET_NO,
873 * Get the randomized delay a response should be subjected to.
875 * @return desired delay
877 static struct GNUNET_TIME_Relative
878 get_randomized_delay ()
880 struct GNUNET_TIME_Relative ret;
882 /* FIXME: replace 5000 with something relating to current observed P2P message latency */
883 ret = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
884 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
886 GNUNET_STATISTICS_update (GSF_stats,
887 gettext_noop ("# artificial delays introduced (ms)"),
896 * Handle a reply to a pending request. Also called if a request
897 * expires (then with data == NULL). The handler may be called
898 * many times (depending on the request type), but will not be
899 * called during or after a call to GSF_pending_request_cancel
900 * and will also not be called anymore after a call signalling
903 * @param cls 'struct PeerRequest' this is an answer for
904 * @param eval evaluation of the result
905 * @param pr handle to the original pending request
906 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
907 * @param expiration when does 'data' expire?
908 * @param type type of the block
909 * @param data response data, NULL on request expiration
910 * @param data_len number of bytes in data
913 handle_p2p_reply (void *cls,
914 enum GNUNET_BLOCK_EvaluationResult eval,
915 struct GSF_PendingRequest *pr,
916 uint32_t reply_anonymity_level,
917 struct GNUNET_TIME_Absolute expiration,
918 enum GNUNET_BLOCK_Type type,
922 struct PeerRequest *peerreq = cls;
923 struct GSF_ConnectedPeer *cp = peerreq->cp;
924 struct GSF_PendingRequestData *prd;
925 struct PutMessage *pm;
928 GNUNET_assert (data_len + sizeof (struct PutMessage) < GNUNET_SERVER_MAX_MESSAGE_SIZE);
929 GNUNET_assert (peerreq->pr == pr);
930 prd = GSF_pending_request_get_data_ (pr);
933 GNUNET_STATISTICS_update (GSF_stats,
934 gettext_noop ("# P2P searches active"),
937 GNUNET_break (GNUNET_OK ==
938 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
941 GNUNET_free (peerreq);
944 GNUNET_break (type != GNUNET_BLOCK_TYPE_ANY);
945 if ( (prd->type != type) &&
946 (prd->type != GNUNET_BLOCK_TYPE_ANY) )
952 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
953 "Transmitting result for query `%s' to peer\n",
954 GNUNET_h2s (&prd->query));
956 GNUNET_STATISTICS_update (GSF_stats,
957 gettext_noop ("# replies received for other peers"),
960 msize = sizeof (struct PutMessage) + data_len;
961 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
966 if ( (reply_anonymity_level != UINT32_MAX) &&
967 (reply_anonymity_level > 1) )
969 if (reply_anonymity_level - 1 > GSF_cover_content_count)
971 GNUNET_STATISTICS_update (GSF_stats,
972 gettext_noop ("# replies dropped due to insufficient cover traffic"),
977 GSF_cover_content_count -= (reply_anonymity_level - 1);
980 pm = GNUNET_malloc (msize);
981 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
982 pm->header.size = htons (msize);
983 pm->type = htonl (type);
984 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
985 memcpy (&pm[1], data, data_len);
986 if ( (reply_anonymity_level != UINT32_MAX) &&
987 (reply_anonymity_level != 0) &&
988 (GSF_enable_randomized_delays == GNUNET_YES) )
990 struct GSF_DelayedHandle *dh;
992 dh = GNUNET_malloc (sizeof (struct GSF_DelayedHandle));
996 GNUNET_CONTAINER_DLL_insert (cp->delayed_head,
999 dh->delay_task = GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
1000 &transmit_delayed_now,
1005 (void) GSF_peer_transmit_ (cp, GNUNET_NO,
1012 if (eval != GNUNET_BLOCK_EVALUATION_OK_LAST)
1014 if (GNUNET_SCHEDULER_NO_TASK == peerreq->kill_task)
1016 GNUNET_STATISTICS_update (GSF_stats,
1017 gettext_noop ("# P2P searches destroyed due to ultimate reply"),
1020 peerreq->kill_task = GNUNET_SCHEDULER_add_now (&peer_request_destroy,
1027 * Increase the host credit by a value.
1029 * @param cp which peer to change the trust value on
1030 * @param value is the int value by which the
1031 * host credit is to be increased or decreased
1032 * @returns the actual change in trust (positive or negative)
1035 change_host_trust (struct GSF_ConnectedPeer *cp, int value)
1039 GNUNET_assert (cp != NULL);
1042 if (cp->ppd.trust + value < cp->ppd.trust)
1044 value = UINT32_MAX - cp->ppd.trust;
1045 cp->ppd.trust = UINT32_MAX;
1048 cp->ppd.trust += value;
1052 if (cp->ppd.trust < -value)
1054 value = -cp->ppd.trust;
1058 cp->ppd.trust += value;
1065 * We've received a request with the specified priority. Bound it
1066 * according to how much we trust the given peer.
1068 * @param prio_in requested priority
1069 * @param cp the peer making the request
1070 * @return effective priority
1073 bound_priority (uint32_t prio_in,
1074 struct GSF_ConnectedPeer *cp)
1076 #define N ((double)128.0)
1081 ld = GSF_test_get_load_too_high_ (0);
1082 if (ld == GNUNET_SYSERR)
1084 GNUNET_STATISTICS_update (GSF_stats,
1085 gettext_noop ("# requests done for free (low load)"),
1088 return 0; /* excess resources */
1090 if (prio_in > INT32_MAX)
1091 prio_in = INT32_MAX;
1092 ret = - change_host_trust (cp, - (int) prio_in);
1095 if (ret > GSF_current_priorities + N)
1096 rret = GSF_current_priorities + N;
1099 GSF_current_priorities
1100 = (GSF_current_priorities * (N-1) + rret)/N;
1102 if ( (ld == GNUNET_YES) && (ret > 0) )
1104 /* try with charging */
1105 ld = GSF_test_get_load_too_high_ (ret);
1107 if (ld == GNUNET_YES)
1109 GNUNET_STATISTICS_update (GSF_stats,
1110 gettext_noop ("# request dropped, priority insufficient"),
1114 change_host_trust (cp, (int) ret);
1115 return -1; /* not enough resources */
1119 GNUNET_STATISTICS_update (GSF_stats,
1120 gettext_noop ("# requests done for a price (normal load)"),
1130 * The priority level imposes a bound on the maximum
1131 * value for the ttl that can be requested.
1133 * @param ttl_in requested ttl
1134 * @param prio given priority
1135 * @return ttl_in if ttl_in is below the limit,
1136 * otherwise the ttl-limit for the given priority
1139 bound_ttl (int32_t ttl_in, uint32_t prio)
1141 unsigned long long allowed;
1145 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1146 if (ttl_in > allowed)
1148 if (allowed >= (1 << 30))
1157 * Handle P2P "QUERY" message. Creates the pending request entry
1158 * and sets up all of the data structures to that we will
1159 * process replies properly. Does not initiate forwarding or
1160 * local database lookups.
1162 * @param other the other peer involved (sender or receiver, NULL
1163 * for loopback messages where we are both sender and receiver)
1164 * @param message the actual message
1165 * @return pending request handle, NULL on error
1167 struct GSF_PendingRequest *
1168 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1169 const struct GNUNET_MessageHeader *message)
1171 struct PeerRequest *peerreq;
1172 struct GSF_PendingRequest *pr;
1173 struct GSF_PendingRequestData *prd;
1174 struct GSF_ConnectedPeer *cp;
1175 struct GSF_ConnectedPeer *cps;
1176 const GNUNET_HashCode *namespace;
1177 const struct GNUNET_PeerIdentity *target;
1178 enum GSF_PendingRequestOptions options;
1180 const struct GetMessage *gm;
1182 const GNUNET_HashCode *opt;
1185 uint32_t ttl_decrement;
1188 enum GNUNET_BLOCK_Type type;
1189 GNUNET_PEER_Id spid;
1191 msize = ntohs(message->size);
1192 if (msize < sizeof (struct GetMessage))
1194 GNUNET_break_op (0);
1197 GNUNET_STATISTICS_update (GSF_stats,
1198 gettext_noop ("# GET requests received (from other peers)"),
1201 gm = (const struct GetMessage*) message;
1202 type = ntohl (gm->type);
1203 bm = ntohl (gm->hash_bitmap);
1211 if (msize < sizeof (struct GetMessage) + bits * sizeof (GNUNET_HashCode))
1213 GNUNET_break_op (0);
1216 opt = (const GNUNET_HashCode*) &gm[1];
1217 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (GNUNET_HashCode);
1218 /* bfsize must be power of 2, check! */
1219 if (0 != ( (bfsize - 1) & bfsize))
1221 GNUNET_break_op (0);
1224 GSF_cover_query_count++;
1225 bm = ntohl (gm->hash_bitmap);
1227 cps = GNUNET_CONTAINER_multihashmap_get (cp_map,
1228 &other->hashPubKey);
1231 /* peer must have just disconnected */
1232 GNUNET_STATISTICS_update (GSF_stats,
1233 gettext_noop ("# requests dropped due to initiator not being connected"),
1238 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1239 cp = GNUNET_CONTAINER_multihashmap_get (cp_map,
1246 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1247 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1248 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
1249 GNUNET_i2s ((const struct GNUNET_PeerIdentity*) &opt[bits-1]));
1252 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1253 "Failed to find peer `%4s' in connection set. Dropping query.\n",
1254 GNUNET_i2s (other));
1256 GNUNET_STATISTICS_update (GSF_stats,
1257 gettext_noop ("# requests dropped due to missing reverse route"),
1262 /* note that we can really only check load here since otherwise
1263 peers could find out that we are overloaded by not being
1264 disconnected after sending us a malformed query... */
1265 priority = bound_priority (ntohl (gm->priority), cps);
1269 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1270 "Dropping query from `%s', this peer is too busy.\n",
1271 GNUNET_i2s (other));
1276 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1277 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
1278 GNUNET_h2s (&gm->query),
1279 (unsigned int) type,
1283 namespace = (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE)) ? &opt[bits++] : NULL;
1284 if ( (type == GNUNET_BLOCK_TYPE_FS_SBLOCK) &&
1285 (namespace == NULL) )
1287 GNUNET_break_op (0);
1290 if ( (type != GNUNET_BLOCK_TYPE_FS_SBLOCK) &&
1291 (namespace != NULL) )
1293 GNUNET_break_op (0);
1296 target = (0 != (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? ((const struct GNUNET_PeerIdentity*) &opt[bits++]) : NULL;
1299 if ( (GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority)) ||
1300 (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1301 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value * 2 + GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)) )
1303 /* don't have BW to send to peer, or would likely take longer than we have for it,
1304 so at best indirect the query */
1306 options |= GSF_PRO_FORWARD_ONLY;
1307 spid = GNUNET_PEER_intern (other);
1309 ttl = bound_ttl (ntohl (gm->ttl), priority);
1310 /* decrement ttl (always) */
1311 ttl_decrement = 2 * TTL_DECREMENT +
1312 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1315 (((int32_t)(ttl - ttl_decrement)) > 0) )
1318 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1319 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1324 GNUNET_STATISTICS_update (GSF_stats,
1325 gettext_noop ("# requests dropped due TTL underflow"),
1328 /* integer underflow => drop (should be very rare)! */
1331 ttl -= ttl_decrement;
1333 /* test if the request already exists */
1334 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map,
1336 if (peerreq != NULL)
1339 prd = GSF_pending_request_get_data_ (pr);
1340 if ( (prd->type == type) &&
1341 ( (type != GNUNET_BLOCK_TYPE_FS_SBLOCK) ||
1342 (0 == memcmp (&prd->namespace,
1344 sizeof (GNUNET_HashCode))) ) )
1346 if (prd->ttl.abs_value >= GNUNET_TIME_absolute_get().abs_value + ttl)
1348 /* existing request has higher TTL, drop new one! */
1349 prd->priority += priority;
1351 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1352 "Have existing request with higher TTL, dropping new request.\n",
1353 GNUNET_i2s (other));
1355 GNUNET_STATISTICS_update (GSF_stats,
1356 gettext_noop ("# requests dropped due to higher-TTL request"),
1361 /* existing request has lower TTL, drop old one! */
1362 GNUNET_STATISTICS_update (GSF_stats,
1363 gettext_noop ("# P2P searches active"),
1366 priority += prd->priority;
1367 GSF_pending_request_cancel_ (pr);
1368 GNUNET_assert (GNUNET_YES ==
1369 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
1372 if (peerreq->kill_task != GNUNET_SCHEDULER_NO_TASK)
1374 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
1375 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
1377 GNUNET_free (peerreq);
1381 peerreq = GNUNET_malloc (sizeof (struct PeerRequest));
1383 pr = GSF_pending_request_create_ (options,
1388 (bfsize > 0) ? (const char*)&opt[bits] : NULL,
1390 ntohl (gm->filter_mutator),
1392 (uint32_t) priority,
1395 NULL, 0, /* replies_seen */
1398 GNUNET_assert (NULL != pr);
1400 GNUNET_break (GNUNET_OK ==
1401 GNUNET_CONTAINER_multihashmap_put (cp->request_map,
1404 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1405 GNUNET_STATISTICS_update (GSF_stats,
1406 gettext_noop ("# P2P query messages received and processed"),
1409 GNUNET_STATISTICS_update (GSF_stats,
1410 gettext_noop ("# P2P searches active"),
1418 * Function called if there has been a timeout trying to satisfy
1419 * a transmission request.
1421 * @param cls the 'struct GSF_PeerTransmitHandle' of the request
1422 * @param tc scheduler context
1425 peer_transmit_timeout (void *cls,
1426 const struct GNUNET_SCHEDULER_TaskContext *tc)
1428 struct GSF_PeerTransmitHandle *pth = cls;
1429 struct GSF_ConnectedPeer *cp;
1432 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1433 "Timeout trying to transmit to other peer\n");
1435 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1437 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1440 if (GNUNET_YES == pth->is_query)
1441 GNUNET_assert (0 < cp->ppd.pending_queries--);
1442 else if (GNUNET_NO == pth->is_query)
1443 GNUNET_assert (0 < cp->ppd.pending_replies--);
1444 GNUNET_LOAD_update (cp->ppd.transmission_delay,
1446 if (NULL != pth->cth)
1448 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1451 pth->gmc (pth->gmc_cls,
1453 GNUNET_assert (0 == pth->cth_in_progress);
1459 * Transmit a message to the given peer as soon as possible.
1460 * If the peer disconnects before the transmission can happen,
1461 * the callback is invoked with a 'NULL' buffer.
1463 * @param cp target peer
1464 * @param is_query is this a query (GNUNET_YES) or content (GNUNET_NO) or neither (GNUNET_SYSERR)
1465 * @param priority how important is this request?
1466 * @param timeout when does this request timeout (call gmc with error)
1467 * @param size number of bytes we would like to send to the peer
1468 * @param gmc function to call to get the message
1469 * @param gmc_cls closure for gmc
1470 * @return handle to cancel request
1472 struct GSF_PeerTransmitHandle *
1473 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
1476 struct GNUNET_TIME_Relative timeout,
1478 GSF_GetMessageCallback gmc,
1481 struct GSF_PeerTransmitHandle *pth;
1482 struct GSF_PeerTransmitHandle *pos;
1483 struct GSF_PeerTransmitHandle *prev;
1485 pth = GNUNET_malloc (sizeof (struct GSF_PeerTransmitHandle));
1486 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1487 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1489 pth->gmc_cls = gmc_cls;
1491 pth->is_query = is_query;
1492 pth->priority = priority;
1494 /* insertion sort (by priority, descending) */
1497 while ( (pos != NULL) &&
1498 (pos->priority > priority) )
1504 GNUNET_CONTAINER_DLL_insert (cp->pth_head,
1508 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head,
1512 if (GNUNET_YES == is_query)
1513 cp->ppd.pending_queries++;
1514 else if (GNUNET_NO == is_query)
1515 cp->ppd.pending_replies++;
1516 pth->timeout_task = GNUNET_SCHEDULER_add_delayed (timeout,
1517 &peer_transmit_timeout,
1519 schedule_transmission (pth);
1525 * Cancel an earlier request for transmission.
1527 * @param pth request to cancel
1530 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1532 struct GSF_ConnectedPeer *cp;
1534 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1536 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1537 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1539 if (NULL != pth->cth)
1541 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1545 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1548 if (GNUNET_YES == pth->is_query)
1549 GNUNET_assert (0 < cp->ppd.pending_queries--);
1550 else if (GNUNET_NO == pth->is_query)
1551 GNUNET_assert (0 < cp->ppd.pending_replies--);
1552 GNUNET_assert (0 == pth->cth_in_progress);
1558 * Report on receiving a reply; update the performance record of the given peer.
1560 * @param cp responding peer (will be updated)
1561 * @param request_time time at which the original query was transmitted
1562 * @param request_priority priority of the original request
1565 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1566 struct GNUNET_TIME_Absolute request_time,
1567 uint32_t request_priority)
1569 struct GNUNET_TIME_Relative delay;
1571 delay = GNUNET_TIME_absolute_get_duration (request_time);
1572 cp->ppd.avg_reply_delay.rel_value = (cp->ppd.avg_reply_delay.rel_value * (RUNAVG_DELAY_N-1) + delay.rel_value) / RUNAVG_DELAY_N;
1573 cp->ppd.avg_priority = (cp->ppd.avg_priority * (RUNAVG_DELAY_N-1) + request_priority) / RUNAVG_DELAY_N;
1578 * Report on receiving a reply in response to an initiating client.
1579 * Remember that this peer is good for this client.
1581 * @param cp responding peer (will be updated)
1582 * @param initiator_client local client on responsible for query
1585 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1586 struct GSF_LocalClient *initiator_client)
1588 cp->ppd.last_client_replies[cp->last_client_replies_woff++ % CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1593 * Report on receiving a reply in response to an initiating peer.
1594 * Remember that this peer is good for this initiating peer.
1596 * @param cp responding peer (will be updated)
1597 * @param initiator_peer other peer responsible for query
1600 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1601 const struct GSF_ConnectedPeer *initiator_peer)
1603 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE], -1);
1604 cp->ppd.last_p2p_replies[cp->last_p2p_replies_woff++ % P2P_SUCCESS_LIST_SIZE] = initiator_peer->ppd.pid;
1605 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1610 * Method called whenever a given peer has a status change.
1612 * @param cls closure
1613 * @param peer peer identity this notification is about
1614 * @param bandwidth_in available amount of inbound bandwidth
1615 * @param bandwidth_out available amount of outbound bandwidth
1616 * @param timeout absolute time when this peer will time out
1617 * unless we see some further activity from it
1618 * @param atsi status information
1621 GSF_peer_status_handler_ (void *cls,
1622 const struct GNUNET_PeerIdentity *peer,
1623 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
1624 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
1625 struct GNUNET_TIME_Absolute timeout,
1626 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1628 struct GSF_ConnectedPeer *cp;
1630 cp = GNUNET_CONTAINER_multihashmap_get (cp_map,
1632 GNUNET_assert (NULL != cp);
1633 update_atsi (cp, atsi);
1638 * A peer disconnected from us. Tear down the connected peer
1642 * @param peer identity of peer that connected
1645 GSF_peer_disconnect_handler_ (void *cls,
1646 const struct GNUNET_PeerIdentity *peer)
1648 struct GSF_ConnectedPeer *cp;
1649 struct GSF_PeerTransmitHandle *pth;
1650 struct GSF_DelayedHandle *dh;
1652 cp = GNUNET_CONTAINER_multihashmap_get (cp_map,
1655 return; /* must have been disconnect from core with
1656 'peer' == my_id, ignore */
1657 GNUNET_CONTAINER_multihashmap_remove (cp_map,
1660 if (NULL != cp->migration_pth)
1662 GSF_peer_transmit_cancel_ (cp->migration_pth);
1663 cp->migration_pth = NULL;
1665 if (NULL != cp->irc)
1667 GNUNET_CORE_peer_change_preference_cancel (cp->irc);
1670 if (GNUNET_SCHEDULER_NO_TASK != cp->irc_delay_task)
1672 GNUNET_SCHEDULER_cancel (cp->irc_delay_task);
1673 cp->irc_delay_task = GNUNET_SCHEDULER_NO_TASK;
1675 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1676 &cancel_pending_request,
1678 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1679 cp->request_map = NULL;
1680 GSF_plan_notify_peer_disconnect_ (cp);
1681 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1682 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1683 GSF_push_stop_ (cp);
1684 while (NULL != (pth = cp->pth_head))
1686 if (NULL != pth->cth)
1688 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1691 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1693 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1694 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1696 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1699 GNUNET_assert (0 == pth->cth_in_progress);
1702 while (NULL != (dh = cp->delayed_head))
1704 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
1707 GNUNET_SCHEDULER_cancel (dh->delay_task);
1708 GNUNET_free (dh->pm);
1711 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1712 if (GNUNET_SCHEDULER_NO_TASK != cp->mig_revive_task)
1714 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1715 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
1722 * Closure for 'call_iterator'.
1724 struct IterationContext
1727 * Function to call on each entry.
1729 GSF_ConnectedPeerIterator it;
1739 * Function that calls the callback for each peer.
1741 * @param cls the 'struct IterationContext*'
1742 * @param key identity of the peer
1743 * @param value the 'struct GSF_ConnectedPeer*'
1744 * @return GNUNET_YES to continue iteration
1747 call_iterator (void *cls,
1748 const GNUNET_HashCode *key,
1751 struct IterationContext *ic = cls;
1752 struct GSF_ConnectedPeer *cp = value;
1755 (const struct GNUNET_PeerIdentity*) key,
1763 * Iterate over all connected peers.
1765 * @param it function to call for each peer
1766 * @param it_cls closure for it
1769 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it,
1772 struct IterationContext ic;
1776 GNUNET_CONTAINER_multihashmap_iterate (cp_map,
1783 * Obtain the identity of a connected peer.
1785 * @param cp peer to reserve bandwidth from
1786 * @param id identity to set (written to)
1789 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1790 struct GNUNET_PeerIdentity *id)
1792 GNUNET_PEER_resolve (cp->ppd.pid,
1798 * Assemble a migration stop message for transmission.
1800 * @param cls the 'struct GSF_ConnectedPeer' to use
1801 * @param size number of bytes we're allowed to write to buf
1802 * @param buf where to copy the message
1803 * @return number of bytes copied to buf
1806 create_migration_stop_message (void *cls,
1810 struct GSF_ConnectedPeer *cp = cls;
1811 struct MigrationStopMessage msm;
1813 cp->migration_pth = NULL;
1816 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1817 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1818 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1819 msm.reserved = htonl (0);
1820 msm.duration = GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining (cp->last_migration_block));
1821 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1822 return sizeof (struct MigrationStopMessage);
1827 * Ask a peer to stop migrating data to us until the given point
1830 * @param cp peer to ask
1831 * @param block_time until when to block
1834 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1835 struct GNUNET_TIME_Relative block_time)
1837 if (GNUNET_TIME_absolute_get_remaining (cp->last_migration_block).rel_value > block_time.rel_value)
1840 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1841 "Migration already blocked for another %llu ms\n",
1842 (unsigned long long) GNUNET_TIME_absolute_get_remaining (cp->last_migration_block).rel_value);
1844 return; /* already blocked */
1847 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1848 "Asking to stop migration for %llu ms\n",
1849 (unsigned long long) block_time.rel_value);
1851 cp->last_migration_block = GNUNET_TIME_relative_to_absolute (block_time);
1852 if (cp->migration_pth != NULL)
1853 GSF_peer_transmit_cancel_ (cp->migration_pth);
1855 = GSF_peer_transmit_ (cp,
1858 GNUNET_TIME_UNIT_FOREVER_REL,
1859 sizeof (struct MigrationStopMessage),
1860 &create_migration_stop_message,
1866 * Write host-trust information to a file - flush the buffer entry!
1868 * @param cls closure, not used
1869 * @param key host identity
1870 * @param value the 'struct GSF_ConnectedPeer' to flush
1871 * @return GNUNET_OK to continue iteration
1874 flush_trust (void *cls,
1875 const GNUNET_HashCode *key,
1878 struct GSF_ConnectedPeer *cp = value;
1881 struct GNUNET_PeerIdentity pid;
1883 if (cp->ppd.trust == cp->disk_trust)
1884 return GNUNET_OK; /* unchanged */
1885 GNUNET_PEER_resolve (cp->ppd.pid,
1887 fn = get_trust_filename (&pid);
1888 if (cp->ppd.trust == 0)
1890 if ((0 != UNLINK (fn)) && (errno != ENOENT))
1891 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING |
1892 GNUNET_ERROR_TYPE_BULK, "unlink", fn);
1896 trust = htonl (cp->ppd.trust);
1897 if (sizeof(uint32_t) == GNUNET_DISK_fn_write (fn, &trust,
1899 GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE
1900 | GNUNET_DISK_PERM_GROUP_READ | GNUNET_DISK_PERM_OTHER_READ))
1901 cp->disk_trust = cp->ppd.trust;
1909 * Notify core about a preference we have for the given peer
1910 * (to allocate more resources towards it). The change will
1911 * be communicated the next time we reserve bandwidth with
1912 * core (not instantly).
1914 * @param cp peer to reserve bandwidth from
1915 * @param pref preference change
1918 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1921 cp->inc_preference += pref;
1926 * Call this method periodically to flush trust information to disk.
1928 * @param cls closure, not used
1929 * @param tc task context, not used
1932 cron_flush_trust (void *cls,
1933 const struct GNUNET_SCHEDULER_TaskContext *tc)
1938 GNUNET_CONTAINER_multihashmap_iterate (cp_map,
1943 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1945 GNUNET_SCHEDULER_add_delayed (TRUST_FLUSH_FREQ,
1952 * Initialize peer management subsystem.
1955 GSF_connected_peer_init_ ()
1957 cp_map = GNUNET_CONTAINER_multihashmap_create (128);
1958 GNUNET_assert (GNUNET_OK ==
1959 GNUNET_CONFIGURATION_get_value_filename (GSF_cfg,
1963 GNUNET_DISK_directory_create (trustDirectory);
1964 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1965 &cron_flush_trust, NULL);
1970 * Iterator to free peer entries.
1972 * @param cls closure, unused
1973 * @param key current key code
1974 * @param value value in the hash map (peer entry)
1975 * @return GNUNET_YES (we should continue to iterate)
1978 clean_peer (void *cls,
1979 const GNUNET_HashCode * key,
1982 GSF_peer_disconnect_handler_ (NULL,
1983 (const struct GNUNET_PeerIdentity*) key);
1989 * Shutdown peer management subsystem.
1992 GSF_connected_peer_done_ ()
1994 cron_flush_trust (NULL, NULL);
1995 GNUNET_CONTAINER_multihashmap_iterate (cp_map,
1998 GNUNET_CONTAINER_multihashmap_destroy (cp_map);
2000 GNUNET_free (trustDirectory);
2001 trustDirectory = NULL;
2006 * Iterator to remove references to LC entry.
2008 * @param cls the 'struct GSF_LocalClient*' to look for
2009 * @param key current key code
2010 * @param value value in the hash map (peer entry)
2011 * @return GNUNET_YES (we should continue to iterate)
2014 clean_local_client (void *cls,
2015 const GNUNET_HashCode * key,
2018 const struct GSF_LocalClient *lc = cls;
2019 struct GSF_ConnectedPeer *cp = value;
2022 for (i=0;i<CS2P_SUCCESS_LIST_SIZE;i++)
2023 if (cp->ppd.last_client_replies[i] == lc)
2024 cp->ppd.last_client_replies[i] = NULL;
2030 * Notification that a local client disconnected. Clean up all of our
2031 * references to the given handle.
2033 * @param lc handle to the local client (henceforth invalid)
2036 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
2039 return; /* already cleaned up */
2040 GNUNET_CONTAINER_multihashmap_iterate (cp_map,
2041 &clean_local_client,
2046 /* end of gnunet-service-fs_cp.c */