2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file fs/gnunet-service-fs_cp.c
23 * @brief API to handle 'connected peers'
24 * @author Christian Grothoff
27 #include "gnunet_load_lib.h"
28 #include "gnunet_ats_service.h"
29 #include "gnunet-service-fs.h"
30 #include "gnunet-service-fs_cp.h"
31 #include "gnunet-service-fs_pe.h"
32 #include "gnunet-service-fs_pr.h"
33 #include "gnunet-service-fs_push.h"
36 * How often do we flush trust values to disk?
38 #define TRUST_FLUSH_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
41 * After how long do we discard a reply?
43 #define REPLY_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
47 * Handle to cancel a transmission request.
49 struct GSF_PeerTransmitHandle
53 * Kept in a doubly-linked list.
55 struct GSF_PeerTransmitHandle *next;
58 * Kept in a doubly-linked list.
60 struct GSF_PeerTransmitHandle *prev;
63 * Handle for an active request for transmission to this
64 * peer, or NULL (if core queue was full).
66 struct GNUNET_CORE_TransmitHandle *cth;
69 * Time when this transmission request was issued.
71 struct GNUNET_TIME_Absolute transmission_request_start_time;
74 * Timeout for this request.
76 struct GNUNET_TIME_Absolute timeout;
79 * Task called on timeout, or 0 for none.
81 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
84 * Function to call to get the actual message.
86 GSF_GetMessageCallback gmc;
89 * Peer this request targets.
91 struct GSF_ConnectedPeer *cp;
99 * Size of the message to be transmitted.
104 * Set to 1 if we're currently in the process of calling
105 * 'GNUNET_CORE_notify_transmit_ready' (so while cth is
106 * NULL, we should not call notify_transmit_ready for this
109 unsigned int cth_in_progress;
112 * GNUNET_YES if this is a query, GNUNET_NO for content.
117 * Did we get a reservation already?
122 * Priority of this request.
130 * Handle for an entry in our delay list.
132 struct GSF_DelayedHandle
136 * Kept in a doubly-linked list.
138 struct GSF_DelayedHandle *next;
141 * Kept in a doubly-linked list.
143 struct GSF_DelayedHandle *prev;
146 * Peer this transmission belongs to.
148 struct GSF_ConnectedPeer *cp;
151 * The PUT that was delayed.
153 struct PutMessage *pm;
156 * Task for the delay.
158 GNUNET_SCHEDULER_TaskIdentifier delay_task;
161 * Size of the message.
169 * Information per peer and request.
175 * Handle to generic request.
177 struct GSF_PendingRequest *pr;
180 * Handle to specific peer.
182 struct GSF_ConnectedPeer *cp;
185 * Task for asynchronous stopping of this request.
187 GNUNET_SCHEDULER_TaskIdentifier kill_task;
195 struct GSF_ConnectedPeer
199 * Performance data for this peer.
201 struct GSF_PeerPerformanceData ppd;
204 * Time until when we blocked this peer from migrating
207 struct GNUNET_TIME_Absolute last_migration_block;
210 * Task scheduled to revive migration to this peer.
212 GNUNET_SCHEDULER_TaskIdentifier mig_revive_task;
215 * Messages (replies, queries, content migration) we would like to
216 * send to this peer in the near future. Sorted by priority, head.
218 struct GSF_PeerTransmitHandle *pth_head;
221 * Messages (replies, queries, content migration) we would like to
222 * send to this peer in the near future. Sorted by priority, tail.
224 struct GSF_PeerTransmitHandle *pth_tail;
227 * Messages (replies, queries, content migration) we would like to
228 * send to this peer in the near future. Sorted by priority, head.
230 struct GSF_DelayedHandle *delayed_head;
233 * Messages (replies, queries, content migration) we would like to
234 * send to this peer in the near future. Sorted by priority, tail.
236 struct GSF_DelayedHandle *delayed_tail;
239 * Migration stop message in our queue, or NULL if we have none pending.
241 struct GSF_PeerTransmitHandle *migration_pth;
244 * Context of our GNUNET_ATS_reserve_bandwidth call (or NULL).
246 struct GNUNET_ATS_ReservationContext *rc;
249 * Task scheduled if we need to retry bandwidth reservation later.
251 GNUNET_SCHEDULER_TaskIdentifier rc_delay_task;
254 * Active requests from this neighbour, map of query to 'struct PeerRequest'.
256 struct GNUNET_CONTAINER_MultiHashMap *request_map;
259 * Increase in traffic preference still to be submitted
260 * to the core service for this peer.
262 uint64_t inc_preference;
265 * Trust rating for this peer on disk.
270 * Which offset in "last_p2p_replies" will be updated next?
271 * (we go round-robin).
273 unsigned int last_p2p_replies_woff;
276 * Which offset in "last_client_replies" will be updated next?
277 * (we go round-robin).
279 unsigned int last_client_replies_woff;
282 * Current offset into 'last_request_times' ring buffer.
284 unsigned int last_request_times_off;
287 * GNUNET_YES if we did successfully reserve 32k bandwidth,
296 * Map from peer identities to 'struct GSF_ConnectPeer' entries.
298 static struct GNUNET_CONTAINER_MultiHashMap *cp_map;
301 * Where do we store trust information?
303 static char *trustDirectory;
306 * Handle to ATS service.
308 static struct GNUNET_ATS_PerformanceHandle *ats;
311 * Get the filename under which we would store the GNUNET_HELLO_Message
312 * for the given host and protocol.
313 * @return filename of the form DIRECTORY/HOSTID
316 get_trust_filename (const struct GNUNET_PeerIdentity *id)
318 struct GNUNET_CRYPTO_HashAsciiEncoded fil;
321 GNUNET_CRYPTO_hash_to_enc (&id->hashPubKey, &fil);
322 GNUNET_asprintf (&fn, "%s%s%s", trustDirectory, DIR_SEPARATOR_STR, &fil);
328 * Find latency information in 'atsi'.
330 * @param atsi performance data
331 * @return connection latency
333 static struct GNUNET_TIME_Relative
334 get_latency (const struct GNUNET_TRANSPORT_ATS_Information *atsi)
337 return GNUNET_TIME_UNIT_SECONDS;
338 while ((ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR) &&
339 (ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY))
341 if (ntohl (atsi->type) == GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR)
343 /* We sometime have no latency data, i.e. if the address came from
344 peerinfo and we never had a chance to play transport-level
345 PING/PONG yet. Assume 1s in that case. */
346 return GNUNET_TIME_UNIT_SECONDS;
348 return GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
349 ntohl (atsi->value));
354 * Update the performance information kept for the given peer.
356 * @param cp peer record to update
357 * @param atsi transport performance data
360 update_atsi (struct GSF_ConnectedPeer *cp,
361 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
363 struct GNUNET_TIME_Relative latency;
365 latency = get_latency (atsi);
366 GNUNET_LOAD_value_set_decline (cp->ppd.transmission_delay, latency);
367 /* LATER: merge atsi into cp's performance data (if we ever care...) */
372 * Return the performance data record for the given peer
374 * @param cp peer to query
375 * @return performance data record for the peer
377 struct GSF_PeerPerformanceData *
378 GSF_get_peer_performance_data_ (struct GSF_ConnectedPeer *cp)
385 * Core is ready to transmit to a peer, get the message.
387 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
388 * @param size number of bytes core is willing to take
389 * @param buf where to copy the message
390 * @return number of bytes copied to buf
393 peer_transmit_ready_cb (void *cls, size_t size, void *buf);
397 * Function called by core upon success or failure of our bandwidth reservation request.
399 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
400 * @param peer identifies the peer
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?
407 ats_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
408 int32_t amount, struct GNUNET_TIME_Relative res_delay);
412 * If ready (bandwidth reserved), try to schedule transmission via
413 * core for the given handle.
415 * @param pth transmission handle to schedule
418 schedule_transmission (struct GSF_PeerTransmitHandle *pth)
420 struct GSF_ConnectedPeer *cp;
421 struct GNUNET_PeerIdentity target;
423 if ((NULL != pth->cth) || (0 != pth->cth_in_progress))
424 return; /* already done */
426 GNUNET_assert (0 != cp->ppd.pid);
427 GNUNET_PEER_resolve (cp->ppd.pid, &target);
429 if (0 != cp->inc_preference)
431 GNUNET_ATS_change_preference (ats,
433 GNUNET_ATS_PREFERENCE_BANDWIDTH,
434 (double) cp->inc_preference,
435 GNUNET_ATS_PREFERENCE_END);
436 cp->inc_preference = 0;
439 if ((GNUNET_YES == pth->is_query) && (GNUNET_YES != pth->was_reserved))
441 /* query, need reservation */
442 if (GNUNET_YES != cp->did_reserve)
443 return; /* not ready */
444 cp->did_reserve = GNUNET_NO;
445 /* reservation already done! */
446 pth->was_reserved = GNUNET_YES;
448 GNUNET_ATS_reserve_bandwidth (ats, &target,
450 &ats_reserve_callback, cp);
452 GNUNET_assert (pth->cth == NULL);
453 pth->cth_in_progress++;
455 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES, pth->priority,
456 GNUNET_TIME_absolute_get_remaining
457 (pth->timeout), &target, pth->size,
458 &peer_transmit_ready_cb, pth);
459 GNUNET_assert (0 < pth->cth_in_progress--);
464 * Core is ready to transmit to a peer, get the message.
466 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
467 * @param size number of bytes core is willing to take
468 * @param buf where to copy the message
469 * @return number of bytes copied to buf
472 peer_transmit_ready_cb (void *cls, size_t size, void *buf)
474 struct GSF_PeerTransmitHandle *pth = cls;
475 struct GSF_PeerTransmitHandle *pos;
476 struct GSF_ConnectedPeer *cp;
479 GNUNET_assert ((NULL == buf) || (pth->size <= size));
481 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
483 GNUNET_SCHEDULER_cancel (pth->timeout_task);
484 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
487 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
488 if (GNUNET_YES == pth->is_query)
490 cp->ppd.last_request_times[(cp->last_request_times_off++) %
491 MAX_QUEUE_PER_PEER] =
492 GNUNET_TIME_absolute_get ();
493 GNUNET_assert (0 < cp->ppd.pending_queries--);
495 else if (GNUNET_NO == pth->is_query)
497 GNUNET_assert (0 < cp->ppd.pending_replies--);
499 GNUNET_LOAD_update (cp->ppd.transmission_delay,
500 GNUNET_TIME_absolute_get_duration
501 (pth->transmission_request_start_time).rel_value);
502 ret = pth->gmc (pth->gmc_cls, size, buf);
503 GNUNET_assert (NULL == pth->cth);
504 for (pos = cp->pth_head; pos != NULL; pos = pos->next)
506 GNUNET_assert (pos != pth);
507 schedule_transmission (pos);
509 GNUNET_assert (pth->cth == NULL);
510 GNUNET_assert (pth->cth_in_progress == 0);
517 * (re)try to reserve bandwidth from the given peer.
519 * @param cls the 'struct GSF_ConnectedPeer' to reserve from
520 * @param tc scheduler context
523 retry_reservation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
525 struct GSF_ConnectedPeer *cp = cls;
526 struct GNUNET_PeerIdentity target;
528 GNUNET_PEER_resolve (cp->ppd.pid, &target);
529 cp->rc_delay_task = GNUNET_SCHEDULER_NO_TASK;
531 GNUNET_ATS_reserve_bandwidth (ats, &target,
533 &ats_reserve_callback, cp);
538 * Function called by core upon success or failure of our bandwidth reservation request.
540 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
541 * @param peer identifies the peer
542 * @param amount set to the amount that was actually reserved or unreserved;
543 * either the full requested amount or zero (no partial reservations)
544 * @param res_delay if the reservation could not be satisfied (amount was 0), how
545 * long should the client wait until re-trying?
548 ats_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
549 int32_t amount, struct GNUNET_TIME_Relative res_delay)
551 struct GSF_ConnectedPeer *cp = cls;
552 struct GSF_PeerTransmitHandle *pth;
558 GNUNET_SCHEDULER_add_delayed (res_delay, &retry_reservation, cp);
561 cp->did_reserve = GNUNET_YES;
563 if ((NULL != pth) && (NULL == pth->cth))
565 /* reservation success, try transmission now! */
566 pth->cth_in_progress++;
568 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES, pth->priority,
569 GNUNET_TIME_absolute_get_remaining
570 (pth->timeout), peer, pth->size,
571 &peer_transmit_ready_cb, pth);
572 GNUNET_assert (0 < pth->cth_in_progress--);
578 * A peer connected to us. Setup the connected peer
581 * @param peer identity of peer that connected
582 * @param atsi performance data for the connection
583 * @return handle to connected peer entry
585 struct GSF_ConnectedPeer *
586 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
587 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
589 struct GSF_ConnectedPeer *cp;
593 cp = GNUNET_malloc (sizeof (struct GSF_ConnectedPeer));
594 cp->ppd.pid = GNUNET_PEER_intern (peer);
595 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
597 GNUNET_ATS_reserve_bandwidth (ats, peer,
599 &ats_reserve_callback, cp);
600 fn = get_trust_filename (peer);
601 if ((GNUNET_DISK_file_test (fn) == GNUNET_YES) &&
602 (sizeof (trust) == GNUNET_DISK_fn_read (fn, &trust, sizeof (trust))))
603 cp->disk_trust = cp->ppd.trust = ntohl (trust);
605 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128);
606 GNUNET_break (GNUNET_OK ==
607 GNUNET_CONTAINER_multihashmap_put (cp_map, &peer->hashPubKey,
609 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
610 update_atsi (cp, atsi);
611 GSF_push_start_ (cp);
617 * It may be time to re-start migrating content to this
618 * peer. Check, and if so, restart migration.
620 * @param cls the 'struct GSF_ConnectedPeer'
621 * @param tc scheduler context
624 revive_migration (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
626 struct GSF_ConnectedPeer *cp = cls;
627 struct GNUNET_TIME_Relative bt;
629 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
630 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
631 if (0 != bt.rel_value)
633 /* still time left... */
634 cp->mig_revive_task =
635 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
638 GSF_push_start_ (cp);
643 * Get a handle for a connected peer.
645 * @param peer peer's identity
646 * @return NULL if the peer is not currently connected
648 struct GSF_ConnectedPeer *
649 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
653 return GNUNET_CONTAINER_multihashmap_get (cp_map, &peer->hashPubKey);
658 * Handle P2P "MIGRATION_STOP" message.
660 * @param cls closure, always NULL
661 * @param other the other peer involved (sender or receiver, NULL
662 * for loopback messages where we are both sender and receiver)
663 * @param message the actual message
664 * @param atsi performance information
665 * @return GNUNET_OK to keep the connection open,
666 * GNUNET_SYSERR to close it (signal serious error)
669 GSF_handle_p2p_migration_stop_ (void *cls,
670 const struct GNUNET_PeerIdentity *other,
671 const struct GNUNET_MessageHeader *message,
672 const struct GNUNET_TRANSPORT_ATS_Information
675 struct GSF_ConnectedPeer *cp;
676 const struct MigrationStopMessage *msm;
677 struct GNUNET_TIME_Relative bt;
679 msm = (const struct MigrationStopMessage *) message;
680 cp = GNUNET_CONTAINER_multihashmap_get (cp_map, &other->hashPubKey);
686 bt = GNUNET_TIME_relative_ntoh (msm->duration);
687 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
688 _("Migration of content to peer `%s' blocked for %llu ms\n"),
689 GNUNET_i2s (other), (unsigned long long) bt.rel_value);
690 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
691 if (cp->mig_revive_task == GNUNET_SCHEDULER_NO_TASK)
694 cp->mig_revive_task =
695 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
697 update_atsi (cp, atsi);
703 * Copy reply and free put message.
705 * @param cls the 'struct PutMessage'
706 * @param buf_size number of bytes available in buf
707 * @param buf where to copy the message, NULL on error (peer disconnect)
708 * @return number of bytes copied to 'buf', can be 0 (without indicating an error)
711 copy_reply (void *cls, size_t buf_size, void *buf)
713 struct PutMessage *pm = cls;
718 GNUNET_assert (buf_size >= ntohs (pm->header.size));
719 size = ntohs (pm->header.size);
720 memcpy (buf, pm, size);
721 GNUNET_STATISTICS_update (GSF_stats,
723 ("# replies transmitted to other peers"), 1,
729 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# replies dropped"), 1,
738 * Cancel all requests associated with the peer.
741 * @param query hash code of the request
742 * @param value the 'struct GSF_PendingRequest'
743 * @return GNUNET_YES (continue to iterate)
746 cancel_pending_request (void *cls, const GNUNET_HashCode * query, void *value)
748 struct PeerRequest *peerreq = value;
749 struct GSF_PendingRequest *pr = peerreq->pr;
750 struct GSF_ConnectedPeer *cp = peerreq->cp;
751 struct GSF_PendingRequestData *prd;
753 if (peerreq->kill_task != GNUNET_SCHEDULER_NO_TASK)
755 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
756 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
758 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
760 prd = GSF_pending_request_get_data_ (pr);
761 GNUNET_break (GNUNET_YES ==
762 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
763 &prd->query, peerreq));
764 GSF_pending_request_cancel_ (pr, GNUNET_NO);
765 GNUNET_free (peerreq);
771 * Free the given request.
773 * @param cls the request to free
774 * @param tc task context
777 peer_request_destroy (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
779 struct PeerRequest *peerreq = cls;
780 struct GSF_PendingRequest *pr = peerreq->pr;
781 struct GSF_PendingRequestData *prd;
783 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
784 prd = GSF_pending_request_get_data_ (pr);
785 cancel_pending_request (NULL, &prd->query, peerreq);
790 * The artificial delay is over, transmit the message now.
792 * @param cls the 'struct GSF_DelayedHandle' with the message
793 * @param tc scheduler context
796 transmit_delayed_now (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
798 struct GSF_DelayedHandle *dh = cls;
799 struct GSF_ConnectedPeer *cp = dh->cp;
801 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
802 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
804 GNUNET_free (dh->pm);
808 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT,
809 dh->msize, ©_reply, dh->pm);
815 * Get the randomized delay a response should be subjected to.
817 * @return desired delay
819 static struct GNUNET_TIME_Relative
820 get_randomized_delay ()
822 struct GNUNET_TIME_Relative ret;
824 /* FIXME: replace 5000 with something relating to current observed P2P message latency */
826 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
827 GNUNET_CRYPTO_random_u32
828 (GNUNET_CRYPTO_QUALITY_WEAK, 5000));
829 GNUNET_STATISTICS_update (GSF_stats,
831 ("# artificial delays introduced (ms)"),
832 ret.rel_value, GNUNET_NO);
839 * Handle a reply to a pending request. Also called if a request
840 * expires (then with data == NULL). The handler may be called
841 * many times (depending on the request type), but will not be
842 * called during or after a call to GSF_pending_request_cancel
843 * and will also not be called anymore after a call signalling
846 * @param cls 'struct PeerRequest' this is an answer for
847 * @param eval evaluation of the result
848 * @param pr handle to the original pending request
849 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
850 * @param expiration when does 'data' expire?
851 * @param type type of the block
852 * @param data response data, NULL on request expiration
853 * @param data_len number of bytes in data
856 handle_p2p_reply (void *cls, enum GNUNET_BLOCK_EvaluationResult eval,
857 struct GSF_PendingRequest *pr, uint32_t reply_anonymity_level,
858 struct GNUNET_TIME_Absolute expiration,
859 enum GNUNET_BLOCK_Type type, const void *data,
862 struct PeerRequest *peerreq = cls;
863 struct GSF_ConnectedPeer *cp = peerreq->cp;
864 struct GSF_PendingRequestData *prd;
865 struct PutMessage *pm;
868 GNUNET_assert (data_len + sizeof (struct PutMessage) <
869 GNUNET_SERVER_MAX_MESSAGE_SIZE);
870 GNUNET_assert (peerreq->pr == pr);
871 prd = GSF_pending_request_get_data_ (pr);
874 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
876 GNUNET_break (GNUNET_YES ==
877 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
878 &prd->query, peerreq));
879 GNUNET_free (peerreq);
882 GNUNET_break (type != GNUNET_BLOCK_TYPE_ANY);
883 if ((prd->type != type) && (prd->type != GNUNET_BLOCK_TYPE_ANY))
889 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
890 "Transmitting result for query `%s' to peer\n",
891 GNUNET_h2s (&prd->query));
893 GNUNET_STATISTICS_update (GSF_stats,
894 gettext_noop ("# replies received for other peers"),
896 msize = sizeof (struct PutMessage) + data_len;
897 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
902 if ((reply_anonymity_level != UINT32_MAX) && (reply_anonymity_level > 1))
904 if (reply_anonymity_level - 1 > GSF_cover_content_count)
906 GNUNET_STATISTICS_update (GSF_stats,
908 ("# replies dropped due to insufficient cover traffic"),
912 GSF_cover_content_count -= (reply_anonymity_level - 1);
915 pm = GNUNET_malloc (msize);
916 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
917 pm->header.size = htons (msize);
918 pm->type = htonl (type);
919 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
920 memcpy (&pm[1], data, data_len);
921 if ((reply_anonymity_level != UINT32_MAX) && (reply_anonymity_level != 0) &&
922 (GSF_enable_randomized_delays == GNUNET_YES))
924 struct GSF_DelayedHandle *dh;
926 dh = GNUNET_malloc (sizeof (struct GSF_DelayedHandle));
930 GNUNET_CONTAINER_DLL_insert (cp->delayed_head, cp->delayed_tail, dh);
932 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
933 &transmit_delayed_now, dh);
937 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT, msize,
940 if (eval != GNUNET_BLOCK_EVALUATION_OK_LAST)
942 if (GNUNET_SCHEDULER_NO_TASK == peerreq->kill_task)
944 GNUNET_STATISTICS_update (GSF_stats,
946 ("# P2P searches destroyed due to ultimate reply"),
949 GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
955 * Increase the host credit by a value.
957 * @param cp which peer to change the trust value on
958 * @param value is the int value by which the
959 * host credit is to be increased or decreased
960 * @returns the actual change in trust (positive or negative)
963 change_host_trust (struct GSF_ConnectedPeer *cp, int value)
967 GNUNET_assert (cp != NULL);
970 if (cp->ppd.trust + value < cp->ppd.trust)
972 value = UINT32_MAX - cp->ppd.trust;
973 cp->ppd.trust = UINT32_MAX;
976 cp->ppd.trust += value;
980 if (cp->ppd.trust < -value)
982 value = -cp->ppd.trust;
986 cp->ppd.trust += value;
993 * We've received a request with the specified priority. Bound it
994 * according to how much we trust the given peer.
996 * @param prio_in requested priority
997 * @param cp the peer making the request
998 * @return effective priority
1001 bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
1003 #define N ((double)128.0)
1008 ld = GSF_test_get_load_too_high_ (0);
1009 if (ld == GNUNET_SYSERR)
1011 GNUNET_STATISTICS_update (GSF_stats,
1013 ("# requests done for free (low load)"), 1,
1015 return 0; /* excess resources */
1017 if (prio_in > INT32_MAX)
1018 prio_in = INT32_MAX;
1019 ret = -change_host_trust (cp, -(int) prio_in);
1022 if (ret > GSF_current_priorities + N)
1023 rret = GSF_current_priorities + N;
1026 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1028 if ((ld == GNUNET_YES) && (ret > 0))
1030 /* try with charging */
1031 ld = GSF_test_get_load_too_high_ (ret);
1033 if (ld == GNUNET_YES)
1035 GNUNET_STATISTICS_update (GSF_stats,
1037 ("# request dropped, priority insufficient"), 1,
1040 change_host_trust (cp, (int) ret);
1041 return -1; /* not enough resources */
1045 GNUNET_STATISTICS_update (GSF_stats,
1047 ("# requests done for a price (normal load)"), 1,
1056 * The priority level imposes a bound on the maximum
1057 * value for the ttl that can be requested.
1059 * @param ttl_in requested ttl
1060 * @param prio given priority
1061 * @return ttl_in if ttl_in is below the limit,
1062 * otherwise the ttl-limit for the given priority
1065 bound_ttl (int32_t ttl_in, uint32_t prio)
1067 unsigned long long allowed;
1071 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1072 if (ttl_in > allowed)
1074 if (allowed >= (1 << 30))
1083 * Handle P2P "QUERY" message. Creates the pending request entry
1084 * and sets up all of the data structures to that we will
1085 * process replies properly. Does not initiate forwarding or
1086 * local database lookups.
1088 * @param other the other peer involved (sender or receiver, NULL
1089 * for loopback messages where we are both sender and receiver)
1090 * @param message the actual message
1091 * @return pending request handle, NULL on error
1093 struct GSF_PendingRequest *
1094 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1095 const struct GNUNET_MessageHeader *message)
1097 struct PeerRequest *peerreq;
1098 struct GSF_PendingRequest *pr;
1099 struct GSF_PendingRequestData *prd;
1100 struct GSF_ConnectedPeer *cp;
1101 struct GSF_ConnectedPeer *cps;
1102 const GNUNET_HashCode *namespace;
1103 const struct GNUNET_PeerIdentity *target;
1104 enum GSF_PendingRequestOptions options;
1106 const struct GetMessage *gm;
1108 const GNUNET_HashCode *opt;
1111 uint32_t ttl_decrement;
1114 enum GNUNET_BLOCK_Type type;
1115 GNUNET_PEER_Id spid;
1117 GNUNET_assert (other != NULL);
1118 msize = ntohs (message->size);
1119 if (msize < sizeof (struct GetMessage))
1121 GNUNET_break_op (0);
1124 GNUNET_STATISTICS_update (GSF_stats,
1126 ("# GET requests received (from other peers)"), 1,
1128 gm = (const struct GetMessage *) message;
1129 type = ntohl (gm->type);
1130 bm = ntohl (gm->hash_bitmap);
1138 if (msize < sizeof (struct GetMessage) + bits * sizeof (GNUNET_HashCode))
1140 GNUNET_break_op (0);
1143 opt = (const GNUNET_HashCode *) &gm[1];
1144 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (GNUNET_HashCode);
1145 /* bfsize must be power of 2, check! */
1146 if (0 != ((bfsize - 1) & bfsize))
1148 GNUNET_break_op (0);
1151 GSF_cover_query_count++;
1152 bm = ntohl (gm->hash_bitmap);
1154 cps = GNUNET_CONTAINER_multihashmap_get (cp_map, &other->hashPubKey);
1157 /* peer must have just disconnected */
1158 GNUNET_STATISTICS_update (GSF_stats,
1160 ("# requests dropped due to initiator not being connected"),
1164 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1165 cp = GNUNET_CONTAINER_multihashmap_get (cp_map, &opt[bits++]);
1171 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1173 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
1174 GNUNET_i2s ((const struct GNUNET_PeerIdentity *)
1178 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1179 "Failed to find peer `%4s' in connection set. Dropping query.\n",
1180 GNUNET_i2s (other));
1182 GNUNET_STATISTICS_update (GSF_stats,
1184 ("# requests dropped due to missing reverse route"),
1188 /* note that we can really only check load here since otherwise
1189 * peers could find out that we are overloaded by not being
1190 * disconnected after sending us a malformed query... */
1191 priority = bound_priority (ntohl (gm->priority), cps);
1195 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1196 "Dropping query from `%s', this peer is too busy.\n",
1197 GNUNET_i2s (other));
1202 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1203 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
1204 GNUNET_h2s (&gm->query), (unsigned int) type, GNUNET_i2s (other),
1207 namespace = (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE)) ? &opt[bits++] : NULL;
1208 if ((type == GNUNET_BLOCK_TYPE_FS_SBLOCK) && (namespace == NULL))
1210 GNUNET_break_op (0);
1213 if ((type != GNUNET_BLOCK_TYPE_FS_SBLOCK) && (namespace != NULL))
1215 GNUNET_break_op (0);
1220 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? ((const struct GNUNET_PeerIdentity
1221 *) &opt[bits++]) : NULL;
1224 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
1225 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1226 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value * 2 +
1227 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1229 /* don't have BW to send to peer, or would likely take longer than we have for it,
1230 * so at best indirect the query */
1232 options |= GSF_PRO_FORWARD_ONLY;
1233 spid = GNUNET_PEER_intern (other);
1234 GNUNET_assert (0 != spid);
1236 ttl = bound_ttl (ntohl (gm->ttl), priority);
1237 /* decrement ttl (always) */
1239 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1241 if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
1244 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1245 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1246 GNUNET_i2s (other), ttl, ttl_decrement);
1248 GNUNET_STATISTICS_update (GSF_stats,
1250 ("# requests dropped due TTL underflow"), 1,
1252 /* integer underflow => drop (should be very rare)! */
1255 ttl -= ttl_decrement;
1257 /* test if the request already exists */
1258 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map, &gm->query);
1259 if (peerreq != NULL)
1262 prd = GSF_pending_request_get_data_ (pr);
1263 if ((prd->type == type) &&
1264 ((type != GNUNET_BLOCK_TYPE_FS_SBLOCK) ||
1265 (0 == memcmp (&prd->namespace, namespace, sizeof (GNUNET_HashCode)))))
1267 if (prd->ttl.abs_value >= GNUNET_TIME_absolute_get ().abs_value + ttl)
1269 /* existing request has higher TTL, drop new one! */
1270 prd->priority += priority;
1272 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1273 "Have existing request with higher TTL, dropping new request.\n",
1274 GNUNET_i2s (other));
1276 GNUNET_STATISTICS_update (GSF_stats,
1278 ("# requests dropped due to higher-TTL request"),
1282 /* existing request has lower TTL, drop old one! */
1283 GNUNET_STATISTICS_update (GSF_stats,
1284 gettext_noop ("# P2P searches active"), -1,
1286 priority += prd->priority;
1287 GSF_pending_request_cancel_ (pr, GNUNET_YES);
1288 GNUNET_assert (GNUNET_YES ==
1289 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
1292 if (peerreq->kill_task != GNUNET_SCHEDULER_NO_TASK)
1294 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
1295 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
1297 GNUNET_free (peerreq);
1301 peerreq = GNUNET_malloc (sizeof (struct PeerRequest));
1303 pr = GSF_pending_request_create_ (options, type, &gm->query, namespace,
1306 0) ? (const char *) &opt[bits] : NULL,
1307 bfsize, ntohl (gm->filter_mutator),
1309 (uint32_t) priority, ttl, spid, NULL, 0, /* replies_seen */
1310 &handle_p2p_reply, peerreq);
1311 GNUNET_assert (NULL != pr);
1313 GNUNET_break (GNUNET_OK ==
1314 GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
1316 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1317 GNUNET_STATISTICS_update (GSF_stats,
1319 ("# P2P query messages received and processed"), 1,
1321 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
1328 * Function called if there has been a timeout trying to satisfy
1329 * a transmission request.
1331 * @param cls the 'struct GSF_PeerTransmitHandle' of the request
1332 * @param tc scheduler context
1335 peer_transmit_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1337 struct GSF_PeerTransmitHandle *pth = cls;
1338 struct GSF_ConnectedPeer *cp;
1341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1342 "Timeout trying to transmit to other peer\n");
1344 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1346 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1347 if (GNUNET_YES == pth->is_query)
1348 GNUNET_assert (0 < cp->ppd.pending_queries--);
1349 else if (GNUNET_NO == pth->is_query)
1350 GNUNET_assert (0 < cp->ppd.pending_replies--);
1351 GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
1352 if (NULL != pth->cth)
1354 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1357 pth->gmc (pth->gmc_cls, 0, NULL);
1358 GNUNET_assert (0 == pth->cth_in_progress);
1364 * Transmit a message to the given peer as soon as possible.
1365 * If the peer disconnects before the transmission can happen,
1366 * the callback is invoked with a 'NULL' buffer.
1368 * @param cp target peer
1369 * @param is_query is this a query (GNUNET_YES) or content (GNUNET_NO) or neither (GNUNET_SYSERR)
1370 * @param priority how important is this request?
1371 * @param timeout when does this request timeout (call gmc with error)
1372 * @param size number of bytes we would like to send to the peer
1373 * @param gmc function to call to get the message
1374 * @param gmc_cls closure for gmc
1375 * @return handle to cancel request
1377 struct GSF_PeerTransmitHandle *
1378 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp, int is_query,
1379 uint32_t priority, struct GNUNET_TIME_Relative timeout,
1380 size_t size, GSF_GetMessageCallback gmc, void *gmc_cls)
1382 struct GSF_PeerTransmitHandle *pth;
1383 struct GSF_PeerTransmitHandle *pos;
1384 struct GSF_PeerTransmitHandle *prev;
1386 pth = GNUNET_malloc (sizeof (struct GSF_PeerTransmitHandle));
1387 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1388 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1390 pth->gmc_cls = gmc_cls;
1392 pth->is_query = is_query;
1393 pth->priority = priority;
1395 /* insertion sort (by priority, descending) */
1398 while ((pos != NULL) && (pos->priority > priority))
1404 GNUNET_CONTAINER_DLL_insert (cp->pth_head, cp->pth_tail, pth);
1406 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head, cp->pth_tail, prev, pth);
1407 if (GNUNET_YES == is_query)
1408 cp->ppd.pending_queries++;
1409 else if (GNUNET_NO == is_query)
1410 cp->ppd.pending_replies++;
1412 GNUNET_SCHEDULER_add_delayed (timeout, &peer_transmit_timeout, pth);
1413 schedule_transmission (pth);
1419 * Cancel an earlier request for transmission.
1421 * @param pth request to cancel
1424 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1426 struct GSF_ConnectedPeer *cp;
1428 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1430 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1431 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1433 if (NULL != pth->cth)
1435 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1439 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
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_assert (0 == pth->cth_in_progress);
1450 * Report on receiving a reply; update the performance record of the given peer.
1452 * @param cp responding peer (will be updated)
1453 * @param request_time time at which the original query was transmitted
1454 * @param request_priority priority of the original request
1457 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1458 struct GNUNET_TIME_Absolute request_time,
1459 uint32_t request_priority)
1461 struct GNUNET_TIME_Relative delay;
1463 delay = GNUNET_TIME_absolute_get_duration (request_time);
1464 cp->ppd.avg_reply_delay.rel_value =
1465 (cp->ppd.avg_reply_delay.rel_value * (RUNAVG_DELAY_N - 1) +
1466 delay.rel_value) / RUNAVG_DELAY_N;
1467 cp->ppd.avg_priority =
1468 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1469 request_priority) / RUNAVG_DELAY_N;
1474 * Report on receiving a reply in response to an initiating client.
1475 * Remember that this peer is good for this client.
1477 * @param cp responding peer (will be updated)
1478 * @param initiator_client local client on responsible for query
1481 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1482 struct GSF_LocalClient *initiator_client)
1484 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1485 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1490 * Report on receiving a reply in response to an initiating peer.
1491 * Remember that this peer is good for this initiating peer.
1493 * @param cp responding peer (will be updated)
1494 * @param initiator_peer other peer responsible for query
1497 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1498 const struct GSF_ConnectedPeer *initiator_peer)
1502 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1503 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1504 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1505 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1506 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1511 * A peer disconnected from us. Tear down the connected peer
1515 * @param peer identity of peer that connected
1518 GSF_peer_disconnect_handler_ (void *cls, const struct GNUNET_PeerIdentity *peer)
1520 struct GSF_ConnectedPeer *cp;
1521 struct GSF_PeerTransmitHandle *pth;
1522 struct GSF_DelayedHandle *dh;
1524 cp = GNUNET_CONTAINER_multihashmap_get (cp_map, &peer->hashPubKey);
1526 return; /* must have been disconnect from core with
1527 * 'peer' == my_id, ignore */
1528 GNUNET_assert (GNUNET_YES ==
1529 GNUNET_CONTAINER_multihashmap_remove (cp_map,
1530 &peer->hashPubKey, cp));
1531 if (NULL != cp->migration_pth)
1533 GSF_peer_transmit_cancel_ (cp->migration_pth);
1534 cp->migration_pth = NULL;
1538 GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
1541 if (GNUNET_SCHEDULER_NO_TASK != cp->rc_delay_task)
1543 GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
1544 cp->rc_delay_task = GNUNET_SCHEDULER_NO_TASK;
1546 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1547 &cancel_pending_request, cp);
1548 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1549 cp->request_map = NULL;
1550 GSF_plan_notify_peer_disconnect_ (cp);
1551 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1552 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1553 memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
1554 GSF_push_stop_ (cp);
1555 while (NULL != (pth = cp->pth_head))
1557 if (NULL != pth->cth)
1559 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1562 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1564 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1565 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1567 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1568 GNUNET_assert (0 == pth->cth_in_progress);
1569 pth->gmc (pth->gmc_cls, 0, NULL);
1572 while (NULL != (dh = cp->delayed_head))
1574 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
1575 GNUNET_SCHEDULER_cancel (dh->delay_task);
1576 GNUNET_free (dh->pm);
1579 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1580 if (GNUNET_SCHEDULER_NO_TASK != cp->mig_revive_task)
1582 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1583 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
1590 * Closure for 'call_iterator'.
1592 struct IterationContext
1595 * Function to call on each entry.
1597 GSF_ConnectedPeerIterator it;
1607 * Function that calls the callback for each peer.
1609 * @param cls the 'struct IterationContext*'
1610 * @param key identity of the peer
1611 * @param value the 'struct GSF_ConnectedPeer*'
1612 * @return GNUNET_YES to continue iteration
1615 call_iterator (void *cls, const GNUNET_HashCode * key, void *value)
1617 struct IterationContext *ic = cls;
1618 struct GSF_ConnectedPeer *cp = value;
1620 ic->it (ic->it_cls, (const struct GNUNET_PeerIdentity *) key, cp, &cp->ppd);
1626 * Iterate over all connected peers.
1628 * @param it function to call for each peer
1629 * @param it_cls closure for it
1632 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it, void *it_cls)
1634 struct IterationContext ic;
1638 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &call_iterator, &ic);
1643 * Obtain the identity of a connected peer.
1645 * @param cp peer to reserve bandwidth from
1646 * @param id identity to set (written to)
1649 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1650 struct GNUNET_PeerIdentity *id)
1652 GNUNET_assert (0 != cp->ppd.pid);
1653 GNUNET_PEER_resolve (cp->ppd.pid, id);
1658 * Assemble a migration stop message for transmission.
1660 * @param cls the 'struct GSF_ConnectedPeer' to use
1661 * @param size number of bytes we're allowed to write to buf
1662 * @param buf where to copy the message
1663 * @return number of bytes copied to buf
1666 create_migration_stop_message (void *cls, size_t size, void *buf)
1668 struct GSF_ConnectedPeer *cp = cls;
1669 struct MigrationStopMessage msm;
1671 cp->migration_pth = NULL;
1674 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1675 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1676 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1677 msm.reserved = htonl (0);
1679 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1680 (cp->last_migration_block));
1681 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1682 return sizeof (struct MigrationStopMessage);
1687 * Ask a peer to stop migrating data to us until the given point
1690 * @param cp peer to ask
1691 * @param block_time until when to block
1694 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1695 struct GNUNET_TIME_Relative block_time)
1697 if (GNUNET_TIME_absolute_get_remaining (cp->last_migration_block).rel_value >
1698 block_time.rel_value)
1701 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1702 "Migration already blocked for another %llu ms\n",
1703 (unsigned long long)
1704 GNUNET_TIME_absolute_get_remaining
1705 (cp->last_migration_block).rel_value);
1707 return; /* already blocked */
1710 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %llu ms\n",
1711 (unsigned long long) block_time.rel_value);
1713 cp->last_migration_block = GNUNET_TIME_relative_to_absolute (block_time);
1714 if (cp->migration_pth != NULL)
1715 GSF_peer_transmit_cancel_ (cp->migration_pth);
1717 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1718 GNUNET_TIME_UNIT_FOREVER_REL,
1719 sizeof (struct MigrationStopMessage),
1720 &create_migration_stop_message, cp);
1725 * Write host-trust information to a file - flush the buffer entry!
1727 * @param cls closure, not used
1728 * @param key host identity
1729 * @param value the 'struct GSF_ConnectedPeer' to flush
1730 * @return GNUNET_OK to continue iteration
1733 flush_trust (void *cls, const GNUNET_HashCode * key, void *value)
1735 struct GSF_ConnectedPeer *cp = value;
1738 struct GNUNET_PeerIdentity pid;
1740 if (cp->ppd.trust == cp->disk_trust)
1741 return GNUNET_OK; /* unchanged */
1742 GNUNET_assert (0 != cp->ppd.pid);
1743 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1744 fn = get_trust_filename (&pid);
1745 if (cp->ppd.trust == 0)
1747 if ((0 != UNLINK (fn)) && (errno != ENOENT))
1748 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING |
1749 GNUNET_ERROR_TYPE_BULK, "unlink", fn);
1753 trust = htonl (cp->ppd.trust);
1754 if (sizeof (uint32_t) ==
1755 GNUNET_DISK_fn_write (fn, &trust, sizeof (uint32_t),
1756 GNUNET_DISK_PERM_USER_READ |
1757 GNUNET_DISK_PERM_USER_WRITE |
1758 GNUNET_DISK_PERM_GROUP_READ |
1759 GNUNET_DISK_PERM_OTHER_READ))
1760 cp->disk_trust = cp->ppd.trust;
1768 * Notify core about a preference we have for the given peer
1769 * (to allocate more resources towards it). The change will
1770 * be communicated the next time we reserve bandwidth with
1771 * core (not instantly).
1773 * @param cp peer to reserve bandwidth from
1774 * @param pref preference change
1777 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1780 cp->inc_preference += pref;
1785 * Call this method periodically to flush trust information to disk.
1787 * @param cls closure, not used
1788 * @param tc task context, not used
1791 cron_flush_trust (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1796 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &flush_trust, NULL);
1799 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1801 GNUNET_SCHEDULER_add_delayed (TRUST_FLUSH_FREQ, &cron_flush_trust, NULL);
1806 * Initialize peer management subsystem.
1809 GSF_connected_peer_init_ ()
1811 cp_map = GNUNET_CONTAINER_multihashmap_create (128);
1812 ats = GNUNET_ATS_performance_init (GSF_cfg, NULL, NULL);
1813 GNUNET_assert (GNUNET_OK ==
1814 GNUNET_CONFIGURATION_get_value_filename (GSF_cfg, "fs",
1817 GNUNET_DISK_directory_create (trustDirectory);
1818 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1819 &cron_flush_trust, NULL);
1824 * Iterator to free peer entries.
1826 * @param cls closure, unused
1827 * @param key current key code
1828 * @param value value in the hash map (peer entry)
1829 * @return GNUNET_YES (we should continue to iterate)
1832 clean_peer (void *cls, const GNUNET_HashCode * key, void *value)
1834 GSF_peer_disconnect_handler_ (NULL, (const struct GNUNET_PeerIdentity *) key);
1840 * Shutdown peer management subsystem.
1843 GSF_connected_peer_done_ ()
1845 cron_flush_trust (NULL, NULL);
1846 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &clean_peer, NULL);
1847 GNUNET_CONTAINER_multihashmap_destroy (cp_map);
1849 GNUNET_free (trustDirectory);
1850 trustDirectory = NULL;
1851 GNUNET_ATS_performance_done (ats);
1857 * Iterator to remove references to LC entry.
1859 * @param cls the 'struct GSF_LocalClient*' to look for
1860 * @param key current key code
1861 * @param value value in the hash map (peer entry)
1862 * @return GNUNET_YES (we should continue to iterate)
1865 clean_local_client (void *cls, const GNUNET_HashCode * key, void *value)
1867 const struct GSF_LocalClient *lc = cls;
1868 struct GSF_ConnectedPeer *cp = value;
1871 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
1872 if (cp->ppd.last_client_replies[i] == lc)
1873 cp->ppd.last_client_replies[i] = NULL;
1879 * Notification that a local client disconnected. Clean up all of our
1880 * references to the given handle.
1882 * @param lc handle to the local client (henceforth invalid)
1885 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
1888 return; /* already cleaned up */
1889 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &clean_local_client,
1894 /* end of gnunet-service-fs_cp.c */