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21 * @file fs/gnunet-service-fs_cp.c
22 * @brief API to handle 'connected peers'
23 * @author Christian Grothoff
26 #include "gnunet_util_lib.h"
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"
33 #include "gnunet_peerstore_service.h"
37 * Ratio for moving average delay calculation. The previous
38 * average goes in with a factor of (n-1) into the calculation.
41 #define RUNAVG_DELAY_N 16
44 * How often do we flush respect values to disk?
46 #define RESPECT_FLUSH_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
49 * After how long do we discard a reply?
51 #define REPLY_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
54 * Collect an instane number of statistics? May cause excessive IPC.
56 #define INSANE_STATISTICS GNUNET_NO
60 * Handle to cancel a transmission request.
62 struct GSF_PeerTransmitHandle
66 * Kept in a doubly-linked list.
68 struct GSF_PeerTransmitHandle *next;
71 * Kept in a doubly-linked list.
73 struct GSF_PeerTransmitHandle *prev;
76 * Time when this transmission request was issued.
78 struct GNUNET_TIME_Absolute transmission_request_start_time;
81 * Timeout for this request.
83 struct GNUNET_TIME_Absolute timeout;
86 * Task called on timeout, or 0 for none.
88 struct GNUNET_SCHEDULER_Task *timeout_task;
91 * Function to call to get the actual message.
93 GSF_GetMessageCallback gmc;
96 * Peer this request targets.
98 struct GSF_ConnectedPeer *cp;
101 * Closure for @e gmc.
106 * Size of the message to be transmitted.
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 struct GNUNET_SCHEDULER_Task *delay_task;
160 * Size of the message.
168 * Information per peer and request.
174 * Handle to generic request (generic: from peer or local client).
176 struct GSF_PendingRequest *pr;
179 * Which specific peer issued this request?
181 struct GSF_ConnectedPeer *cp;
184 * Task for asynchronous stopping of this request.
186 struct GNUNET_SCHEDULER_Task *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 struct GNUNET_SCHEDULER_Task *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_ATS_reserve_bandwidth call (or NULL).
245 struct GNUNET_ATS_ReservationContext *rc;
248 * Task scheduled if we need to retry bandwidth reservation later.
250 struct GNUNET_SCHEDULER_Task *rc_delay_task;
253 * Active requests from this neighbour, map of query to `struct PeerRequest`.
255 struct GNUNET_CONTAINER_MultiHashMap *request_map;
258 * Handle for an active request for transmission to this
259 * peer, or NULL (if core queue was full).
261 struct GNUNET_CORE_TransmitHandle *cth;
264 * Increase in traffic preference still to be submitted
265 * to the core service for this peer.
267 uint64_t inc_preference;
270 * Set to 1 if we're currently in the process of calling
271 * #GNUNET_CORE_notify_transmit_ready() (so while @e cth is
272 * NULL, we should not call notify_transmit_ready for this
275 unsigned int cth_in_progress;
278 * Number of entries in @e delayed_head DLL.
280 unsigned int delay_queue_size;
283 * Respect rating for this peer on disk.
285 uint32_t disk_respect;
288 * Which offset in @e last_p2p_replies will be updated next?
289 * (we go round-robin).
291 unsigned int last_p2p_replies_woff;
294 * Which offset in @e last_client_replies will be updated next?
295 * (we go round-robin).
297 unsigned int last_client_replies_woff;
300 * Current offset into @e last_request_times ring buffer.
302 unsigned int last_request_times_off;
305 * #GNUNET_YES if we did successfully reserve 32k bandwidth,
311 * Function called when the creation of this record is complete.
313 GSF_ConnectedPeerCreationCallback creation_cb;
316 * Closure for @e creation_cb
318 void *creation_cb_cls;
321 * Handle to the PEERSTORE iterate request for peer respect value
323 struct GNUNET_PEERSTORE_IterateContext *respect_iterate_req;
329 * Map from peer identities to `struct GSF_ConnectPeer` entries.
331 static struct GNUNET_CONTAINER_MultiPeerMap *cp_map;
334 * Handle to peerstore service.
336 static struct GNUNET_PEERSTORE_Handle *peerstore;
339 * Task used to flush respect values to disk.
341 static struct GNUNET_SCHEDULER_Task *fr_task;
345 * Update the latency information kept for the given peer.
347 * @param id peer record to update
348 * @param latency current latency value
351 GSF_update_peer_latency_ (const struct GNUNET_PeerIdentity *id,
352 struct GNUNET_TIME_Relative latency)
354 struct GSF_ConnectedPeer *cp;
356 cp = GSF_peer_get_ (id);
358 return; /* we're not yet connected at the core level, ignore */
359 GNUNET_LOAD_value_set_decline (cp->ppd.transmission_delay,
365 * Return the performance data record for the given peer
367 * @param cp peer to query
368 * @return performance data record for the peer
370 struct GSF_PeerPerformanceData *
371 GSF_get_peer_performance_data_ (struct GSF_ConnectedPeer *cp)
378 * Core is ready to transmit to a peer, get the message.
380 * @param cls the `struct GSF_PeerTransmitHandle` of the message
381 * @param size number of bytes core is willing to take
382 * @param buf where to copy the message
383 * @return number of bytes copied to @a buf
386 peer_transmit_ready_cb (void *cls,
392 * Function called by core upon success or failure of our bandwidth reservation request.
394 * @param cls the `struct GSF_ConnectedPeer` of the peer for which we made the request
395 * @param peer identifies the peer
396 * @param amount set to the amount that was actually reserved or unreserved;
397 * either the full requested amount or zero (no partial reservations)
398 * @param res_delay if the reservation could not be satisfied (amount was 0), how
399 * long should the client wait until re-trying?
402 ats_reserve_callback (void *cls,
403 const struct GNUNET_PeerIdentity *peer,
405 struct GNUNET_TIME_Relative res_delay);
409 * If ready (bandwidth reserved), try to schedule transmission via
410 * core for the given handle.
412 * @param pth transmission handle to schedule
415 schedule_transmission (struct GSF_PeerTransmitHandle *pth)
417 struct GSF_ConnectedPeer *cp;
418 struct GNUNET_PeerIdentity target;
421 if ((NULL != cp->cth) || (0 != cp->cth_in_progress))
422 return; /* already done */
423 GNUNET_assert (0 != cp->ppd.pid);
424 GNUNET_PEER_resolve (cp->ppd.pid, &target);
426 if (0 != cp->inc_preference)
428 GNUNET_ATS_performance_change_preference (GSF_ats,
430 GNUNET_ATS_PREFERENCE_BANDWIDTH,
431 (double) cp->inc_preference,
432 GNUNET_ATS_PREFERENCE_END);
433 cp->inc_preference = 0;
436 if ( (GNUNET_YES == pth->is_query) &&
437 (GNUNET_YES != pth->was_reserved) )
439 /* query, need reservation */
440 if (GNUNET_YES != cp->did_reserve)
441 return; /* not ready */
442 cp->did_reserve = GNUNET_NO;
443 /* reservation already done! */
444 pth->was_reserved = GNUNET_YES;
445 cp->rc = GNUNET_ATS_reserve_bandwidth (GSF_ats,
448 &ats_reserve_callback,
452 GNUNET_assert (NULL == cp->cth);
453 cp->cth_in_progress++;
455 GNUNET_CORE_notify_transmit_ready (GSF_core,
457 GNUNET_CORE_PRIO_BACKGROUND,
458 GNUNET_TIME_absolute_get_remaining (pth->timeout),
461 &peer_transmit_ready_cb, cp);
462 GNUNET_assert (NULL != cp->cth);
463 GNUNET_assert (0 < cp->cth_in_progress--);
468 * Core is ready to transmit to a peer, get the message.
470 * @param cls the `struct GSF_PeerTransmitHandle` of the message
471 * @param size number of bytes core is willing to take
472 * @param buf where to copy the message
473 * @return number of bytes copied to @a buf
476 peer_transmit_ready_cb (void *cls,
480 struct GSF_ConnectedPeer *cp = cls;
481 struct GSF_PeerTransmitHandle *pth = cp->pth_head;
482 struct GSF_PeerTransmitHandle *pos;
488 if (pth->size > size)
490 schedule_transmission (pth);
493 if (NULL != pth->timeout_task)
495 GNUNET_SCHEDULER_cancel (pth->timeout_task);
496 pth->timeout_task = NULL;
498 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
501 if (GNUNET_YES == pth->is_query)
503 cp->ppd.last_request_times[(cp->last_request_times_off++) %
504 MAX_QUEUE_PER_PEER] =
505 GNUNET_TIME_absolute_get ();
506 GNUNET_assert (0 < cp->ppd.pending_queries--);
508 else if (GNUNET_NO == pth->is_query)
510 GNUNET_assert (0 < cp->ppd.pending_replies--);
512 GNUNET_LOAD_update (cp->ppd.transmission_delay,
513 GNUNET_TIME_absolute_get_duration
514 (pth->transmission_request_start_time).rel_value_us);
515 ret = pth->gmc (pth->gmc_cls, size, buf);
516 if (NULL != (pos = cp->pth_head))
518 GNUNET_assert (pos != pth);
519 schedule_transmission (pos);
527 * (re)try to reserve bandwidth from the given peer.
529 * @param cls the `struct GSF_ConnectedPeer` to reserve from
532 retry_reservation (void *cls)
534 struct GSF_ConnectedPeer *cp = cls;
535 struct GNUNET_PeerIdentity target;
537 GNUNET_PEER_resolve (cp->ppd.pid, &target);
538 cp->rc_delay_task = NULL;
540 GNUNET_ATS_reserve_bandwidth (GSF_ats,
543 &ats_reserve_callback, cp);
548 * Function called by core upon success or failure of our bandwidth reservation request.
550 * @param cls the `struct GSF_ConnectedPeer` of the peer for which we made the request
551 * @param peer identifies the peer
552 * @param amount set to the amount that was actually reserved or unreserved;
553 * either the full requested amount or zero (no partial reservations)
554 * @param res_delay if the reservation could not be satisfied (amount was 0), how
555 * long should the client wait until re-trying?
558 ats_reserve_callback (void *cls,
559 const struct GNUNET_PeerIdentity *peer,
561 struct GNUNET_TIME_Relative res_delay)
563 struct GSF_ConnectedPeer *cp = cls;
564 struct GSF_PeerTransmitHandle *pth;
566 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
567 "Reserved %d bytes / need to wait %s for reservation\n",
569 GNUNET_STRINGS_relative_time_to_string (res_delay, GNUNET_YES));
574 GNUNET_SCHEDULER_add_delayed (res_delay,
579 cp->did_reserve = GNUNET_YES;
581 if ( (NULL != pth) &&
583 (0 == cp->cth_in_progress) )
585 /* reservation success, try transmission now! */
586 cp->cth_in_progress++;
588 GNUNET_CORE_notify_transmit_ready (GSF_core,
590 GNUNET_CORE_PRIO_BACKGROUND,
591 GNUNET_TIME_absolute_get_remaining (pth->timeout),
594 &peer_transmit_ready_cb,
596 GNUNET_assert (NULL != cp->cth);
597 GNUNET_assert (0 < cp->cth_in_progress--);
603 * Function called by PEERSTORE with peer respect record
605 * @param cls handle to connected peer entry
606 * @param record peerstore record information
607 * @param emsg error message, or NULL if no errors
610 peer_respect_cb (void *cls,
611 const struct GNUNET_PEERSTORE_Record *record,
614 struct GSF_ConnectedPeer *cp = cls;
616 GNUNET_assert (NULL != cp->respect_iterate_req);
617 printf("Got a record!\n");
618 if ((NULL != record) && (sizeof (cp->disk_respect) == record->value_size))
619 cp->disk_respect = cp->ppd.respect = *((uint32_t *)record->value);
620 GSF_push_start_ (cp);
621 if (NULL != cp->creation_cb)
622 cp->creation_cb (cp->creation_cb_cls, cp);
625 printf("Cancelling!\n");
626 GNUNET_PEERSTORE_iterate_cancel (cp->respect_iterate_req);
627 cp->respect_iterate_req = NULL;
633 * A peer connected to us. Setup the connected peer
636 * @param peer identity of peer that connected
637 * @param creation_cb callback function when the record is created.
638 * @param creation_cb_cls closure for @creation_cb
641 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
642 GSF_ConnectedPeerCreationCallback creation_cb,
643 void *creation_cb_cls)
645 struct GSF_ConnectedPeer *cp;
647 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
648 "Connected to peer %s\n",
650 cp = GNUNET_new (struct GSF_ConnectedPeer);
651 cp->ppd.pid = GNUNET_PEER_intern (peer);
652 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
654 GNUNET_ATS_reserve_bandwidth (GSF_ats,
657 &ats_reserve_callback, cp);
658 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128,
660 GNUNET_break (GNUNET_OK ==
661 GNUNET_CONTAINER_multipeermap_put (cp_map,
662 GSF_connected_peer_get_identity2_ (cp),
664 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
665 GNUNET_STATISTICS_set (GSF_stats,
666 gettext_noop ("# peers connected"),
667 GNUNET_CONTAINER_multipeermap_size (cp_map),
669 cp->creation_cb = creation_cb;
670 cp->creation_cb_cls = creation_cb_cls;
671 cp->respect_iterate_req =
672 GNUNET_PEERSTORE_iterate (peerstore, "fs",
674 GNUNET_TIME_UNIT_FOREVER_REL,
681 * It may be time to re-start migrating content to this
682 * peer. Check, and if so, restart migration.
684 * @param cls the `struct GSF_ConnectedPeer`
687 revive_migration (void *cls)
689 struct GSF_ConnectedPeer *cp = cls;
690 struct GNUNET_TIME_Relative bt;
692 cp->mig_revive_task = NULL;
693 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
694 if (0 != bt.rel_value_us)
696 /* still time left... */
697 cp->mig_revive_task =
698 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
701 GSF_push_start_ (cp);
706 * Get a handle for a connected peer.
708 * @param peer peer's identity
709 * @return NULL if the peer is not currently connected
711 struct GSF_ConnectedPeer *
712 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
716 return GNUNET_CONTAINER_multipeermap_get (cp_map, peer);
721 * Handle P2P "MIGRATION_STOP" message.
723 * @param cls closure, always NULL
724 * @param other the other peer involved (sender or receiver, NULL
725 * for loopback messages where we are both sender and receiver)
726 * @param message the actual message
727 * @return #GNUNET_OK to keep the connection open,
728 * #GNUNET_SYSERR to close it (signal serious error)
731 GSF_handle_p2p_migration_stop_ (void *cls,
732 const struct GNUNET_PeerIdentity *other,
733 const struct GNUNET_MessageHeader *message)
735 struct GSF_ConnectedPeer *cp;
736 const struct MigrationStopMessage *msm;
737 struct GNUNET_TIME_Relative bt;
739 msm = (const struct MigrationStopMessage *) message;
740 cp = GSF_peer_get_ (other);
746 GNUNET_STATISTICS_update (GSF_stats,
747 gettext_noop ("# migration stop messages received"),
749 bt = GNUNET_TIME_relative_ntoh (msm->duration);
750 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
751 _("Migration of content to peer `%s' blocked for %s\n"),
753 GNUNET_STRINGS_relative_time_to_string (bt, GNUNET_YES));
754 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
755 if ( (NULL == cp->mig_revive_task) &&
756 (NULL == cp->respect_iterate_req) )
759 cp->mig_revive_task =
760 GNUNET_SCHEDULER_add_delayed (bt,
761 &revive_migration, cp);
768 * Copy reply and free put message.
770 * @param cls the `struct PutMessage`
771 * @param buf_size number of bytes available in @a buf
772 * @param buf where to copy the message, NULL on error (peer disconnect)
773 * @return number of bytes copied to @a buf, can be 0 (without indicating an error)
776 copy_reply (void *cls,
780 struct PutMessage *pm = cls;
785 GNUNET_assert (buf_size >= ntohs (pm->header.size));
786 size = ntohs (pm->header.size);
787 memcpy (buf, pm, size);
788 GNUNET_STATISTICS_update (GSF_stats,
789 gettext_noop ("# replies transmitted to other peers"),
796 GNUNET_STATISTICS_update (GSF_stats,
797 gettext_noop ("# replies dropped"),
807 * Free resources associated with the given peer request.
809 * @param peerreq request to free
812 free_pending_request (struct PeerRequest *peerreq)
814 struct GSF_ConnectedPeer *cp = peerreq->cp;
815 struct GSF_PendingRequestData *prd;
817 prd = GSF_pending_request_get_data_ (peerreq->pr);
818 if (NULL != peerreq->kill_task)
820 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
821 peerreq->kill_task = NULL;
823 GNUNET_STATISTICS_update (GSF_stats,
824 gettext_noop ("# P2P searches active"),
827 GNUNET_break (GNUNET_YES ==
828 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
831 GNUNET_free (peerreq);
836 * Cancel all requests associated with the peer.
839 * @param query hash code of the request
840 * @param value the `struct GSF_PendingRequest`
841 * @return #GNUNET_YES (continue to iterate)
844 cancel_pending_request (void *cls,
845 const struct GNUNET_HashCode *query,
848 struct PeerRequest *peerreq = value;
849 struct GSF_PendingRequest *pr = peerreq->pr;
851 free_pending_request (peerreq);
852 GSF_pending_request_cancel_ (pr,
859 * Free the given request.
861 * @param cls the request to free
864 peer_request_destroy (void *cls)
866 struct PeerRequest *peerreq = cls;
867 struct GSF_PendingRequest *pr = peerreq->pr;
868 struct GSF_PendingRequestData *prd;
870 peerreq->kill_task = NULL;
871 prd = GSF_pending_request_get_data_ (pr);
872 cancel_pending_request (NULL,
879 * The artificial delay is over, transmit the message now.
881 * @param cls the `struct GSF_DelayedHandle` with the message
884 transmit_delayed_now (void *cls)
886 struct GSF_DelayedHandle *dh = cls;
887 struct GSF_ConnectedPeer *cp = dh->cp;
889 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
892 cp->delay_queue_size--;
893 (void) GSF_peer_transmit_ (cp,
905 * Get the randomized delay a response should be subjected to.
907 * @return desired delay
909 static struct GNUNET_TIME_Relative
910 get_randomized_delay ()
912 struct GNUNET_TIME_Relative ret;
915 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
916 GNUNET_CRYPTO_random_u32
917 (GNUNET_CRYPTO_QUALITY_WEAK,
918 2 * GSF_avg_latency.rel_value_us + 1));
919 #if INSANE_STATISTICS
920 GNUNET_STATISTICS_update (GSF_stats,
922 ("# artificial delays introduced (ms)"),
923 ret.rel_value_us / 1000LL, GNUNET_NO);
930 * Handle a reply to a pending request. Also called if a request
931 * expires (then with data == NULL). The handler may be called
932 * many times (depending on the request type), but will not be
933 * called during or after a call to GSF_pending_request_cancel
934 * and will also not be called anymore after a call signalling
937 * @param cls `struct PeerRequest` this is an answer for
938 * @param eval evaluation of the result
939 * @param pr handle to the original pending request
940 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
941 * @param expiration when does @a data expire?
942 * @param last_transmission when did we last transmit a request for this block
943 * @param type type of the block
944 * @param data response data, NULL on request expiration
945 * @param data_len number of bytes in @a data
948 handle_p2p_reply (void *cls,
949 enum GNUNET_BLOCK_EvaluationResult eval,
950 struct GSF_PendingRequest *pr,
951 uint32_t reply_anonymity_level,
952 struct GNUNET_TIME_Absolute expiration,
953 struct GNUNET_TIME_Absolute last_transmission,
954 enum GNUNET_BLOCK_Type type,
958 struct PeerRequest *peerreq = cls;
959 struct GSF_ConnectedPeer *cp = peerreq->cp;
960 struct GSF_PendingRequestData *prd;
961 struct PutMessage *pm;
964 GNUNET_assert (data_len + sizeof (struct PutMessage) <
965 GNUNET_SERVER_MAX_MESSAGE_SIZE);
966 GNUNET_assert (peerreq->pr == pr);
967 prd = GSF_pending_request_get_data_ (pr);
970 free_pending_request (peerreq);
973 GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
974 if ((prd->type != type) && (GNUNET_BLOCK_TYPE_ANY != prd->type))
976 GNUNET_STATISTICS_update (GSF_stats,
978 ("# replies dropped due to type mismatch"),
982 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
983 "Transmitting result for query `%s' to peer\n",
984 GNUNET_h2s (&prd->query));
985 GNUNET_STATISTICS_update (GSF_stats,
986 gettext_noop ("# replies received for other peers"),
988 msize = sizeof (struct PutMessage) + data_len;
989 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
994 if ((UINT32_MAX != reply_anonymity_level) && (reply_anonymity_level > 1))
996 if (reply_anonymity_level - 1 > GSF_cover_content_count)
998 GNUNET_STATISTICS_update (GSF_stats,
1000 ("# replies dropped due to insufficient cover traffic"),
1004 GSF_cover_content_count -= (reply_anonymity_level - 1);
1007 pm = GNUNET_malloc (msize);
1008 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
1009 pm->header.size = htons (msize);
1010 pm->type = htonl (type);
1011 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
1012 memcpy (&pm[1], data, data_len);
1013 if ( (UINT32_MAX != reply_anonymity_level) &&
1014 (0 != reply_anonymity_level) &&
1015 (GNUNET_YES == GSF_enable_randomized_delays) )
1017 struct GSF_DelayedHandle *dh;
1019 dh = GNUNET_new (struct GSF_DelayedHandle);
1023 GNUNET_CONTAINER_DLL_insert (cp->delayed_head,
1026 cp->delay_queue_size++;
1028 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
1029 &transmit_delayed_now,
1034 (void) GSF_peer_transmit_ (cp,
1042 if (GNUNET_BLOCK_EVALUATION_OK_LAST != eval)
1044 if (NULL == peerreq->kill_task)
1046 GNUNET_STATISTICS_update (GSF_stats,
1048 ("# P2P searches destroyed due to ultimate reply"),
1051 peerreq->kill_task =
1052 GNUNET_SCHEDULER_add_now (&peer_request_destroy,
1059 * Increase the peer's respect by a value.
1061 * @param cp which peer to change the respect value on
1062 * @param value is the int value by which the
1063 * peer's credit is to be increased or decreased
1064 * @returns the actual change in respect (positive or negative)
1067 change_peer_respect (struct GSF_ConnectedPeer *cp, int value)
1071 GNUNET_assert (NULL != cp);
1074 if (cp->ppd.respect + value < cp->ppd.respect)
1076 value = UINT32_MAX - cp->ppd.respect;
1077 cp->ppd.respect = UINT32_MAX;
1080 cp->ppd.respect += value;
1084 if (cp->ppd.respect < -value)
1086 value = -cp->ppd.respect;
1087 cp->ppd.respect = 0;
1090 cp->ppd.respect += value;
1097 * We've received a request with the specified priority. Bound it
1098 * according to how much we respect the given peer.
1100 * @param prio_in requested priority
1101 * @param cp the peer making the request
1102 * @return effective priority
1105 bound_priority (uint32_t prio_in,
1106 struct GSF_ConnectedPeer *cp)
1108 #define N ((double)128.0)
1113 ld = GSF_test_get_load_too_high_ (0);
1114 if (GNUNET_SYSERR == ld)
1116 #if INSANE_STATISTICS
1117 GNUNET_STATISTICS_update (GSF_stats,
1119 ("# requests done for free (low load)"), 1,
1122 return 0; /* excess resources */
1124 if (prio_in > INT32_MAX)
1125 prio_in = INT32_MAX;
1126 ret = -change_peer_respect (cp, -(int) prio_in);
1129 if (ret > GSF_current_priorities + N)
1130 rret = GSF_current_priorities + N;
1133 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1135 if ((GNUNET_YES == ld) && (ret > 0))
1137 /* try with charging */
1138 ld = GSF_test_get_load_too_high_ (ret);
1140 if (GNUNET_YES == ld)
1142 GNUNET_STATISTICS_update (GSF_stats,
1144 ("# request dropped, priority insufficient"), 1,
1147 change_peer_respect (cp, (int) ret);
1148 return -1; /* not enough resources */
1152 GNUNET_STATISTICS_update (GSF_stats,
1154 ("# requests done for a price (normal load)"), 1,
1163 * The priority level imposes a bound on the maximum
1164 * value for the ttl that can be requested.
1166 * @param ttl_in requested ttl
1167 * @param prio given priority
1168 * @return @a ttl_in if @a ttl_in is below the limit,
1169 * otherwise the ttl-limit for the given @a prio
1172 bound_ttl (int32_t ttl_in,
1175 unsigned long long allowed;
1179 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1180 if (ttl_in > allowed)
1182 if (allowed >= (1 << 30))
1191 * Closure for #test_exist_cb().
1193 struct TestExistClosure
1197 * Priority of the incoming request.
1202 * Relative TTL of the incoming request.
1207 * Type of the incoming request.
1209 enum GNUNET_BLOCK_Type type;
1212 * Set to #GNUNET_YES if we are done handling the query.
1220 * Test if the query already exists. If so, merge it, otherwise
1221 * keep `finished` at #GNUNET_NO.
1223 * @param cls our `struct TestExistClosure`
1224 * @param hc the key of the query
1225 * @param value the existing `struct PeerRequest`.
1226 * @return #GNUNET_YES to continue to iterate,
1227 * #GNUNET_NO if we successfully merged
1230 test_exist_cb (void *cls,
1231 const struct GNUNET_HashCode *hc,
1234 struct TestExistClosure *tec = cls;
1235 struct PeerRequest *peerreq = value;
1236 struct GSF_PendingRequest *pr;
1237 struct GSF_PendingRequestData *prd;
1240 prd = GSF_pending_request_get_data_ (pr);
1241 if (prd->type != tec->type)
1243 if (prd->ttl.abs_value_us >=
1244 GNUNET_TIME_absolute_get ().abs_value_us + tec->ttl * 1000LL)
1246 /* existing request has higher TTL, drop new one! */
1247 prd->priority += tec->priority;
1248 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1249 "Have existing request with higher TTL, dropping new request.\n");
1250 GNUNET_STATISTICS_update (GSF_stats,
1252 ("# requests dropped due to higher-TTL request"),
1254 tec->finished = GNUNET_YES;
1257 /* existing request has lower TTL, drop old one! */
1258 tec->priority += prd->priority;
1259 free_pending_request (peerreq);
1260 GSF_pending_request_cancel_ (pr,
1267 * Handle P2P "QUERY" message. Creates the pending request entry
1268 * and sets up all of the data structures to that we will
1269 * process replies properly. Does not initiate forwarding or
1270 * local database lookups.
1272 * @param other the other peer involved (sender or receiver, NULL
1273 * for loopback messages where we are both sender and receiver)
1274 * @param message the actual message
1275 * @return pending request handle, NULL on error
1277 struct GSF_PendingRequest *
1278 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1279 const struct GNUNET_MessageHeader *message)
1281 struct PeerRequest *peerreq;
1282 struct GSF_PendingRequest *pr;
1283 struct GSF_ConnectedPeer *cp;
1284 struct GSF_ConnectedPeer *cps;
1285 const struct GNUNET_PeerIdentity *target;
1286 enum GSF_PendingRequestOptions options;
1288 const struct GetMessage *gm;
1290 const struct GNUNET_PeerIdentity *opt;
1293 uint32_t ttl_decrement;
1294 struct TestExistClosure tec;
1295 GNUNET_PEER_Id spid;
1296 const struct GSF_PendingRequestData *prd;
1298 msize = ntohs (message->size);
1299 if (msize < sizeof (struct GetMessage))
1301 GNUNET_break_op (0);
1304 GNUNET_STATISTICS_update (GSF_stats,
1306 ("# GET requests received (from other peers)"),
1309 gm = (const struct GetMessage *) message;
1310 tec.type = ntohl (gm->type);
1311 bm = ntohl (gm->hash_bitmap);
1319 if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_PeerIdentity))
1321 GNUNET_break_op (0);
1324 opt = (const struct GNUNET_PeerIdentity *) &gm[1];
1325 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_PeerIdentity);
1326 /* bfsize must be power of 2, check! */
1327 if (0 != ((bfsize - 1) & bfsize))
1329 GNUNET_break_op (0);
1332 GSF_cover_query_count++;
1333 bm = ntohl (gm->hash_bitmap);
1335 cps = GSF_peer_get_ (other);
1338 /* peer must have just disconnected */
1339 GNUNET_STATISTICS_update (GSF_stats,
1341 ("# requests dropped due to initiator not being connected"),
1345 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1346 cp = GSF_peer_get_ (&opt[bits++]);
1351 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1353 "Failed to find RETURN-TO peer `%s' in connection set. Dropping query.\n",
1354 GNUNET_i2s (&opt[bits - 1]));
1357 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1358 "Failed to find peer `%s' in connection set. Dropping query.\n",
1359 GNUNET_i2s (other));
1360 GNUNET_STATISTICS_update (GSF_stats,
1362 ("# requests dropped due to missing reverse route"),
1367 if (cp->ppd.pending_replies + cp->delay_queue_size > MAX_QUEUE_PER_PEER)
1369 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1370 "Peer `%s' has too many replies queued already. Dropping query.\n",
1371 GNUNET_i2s (other));
1372 GNUNET_STATISTICS_update (GSF_stats,
1373 gettext_noop ("# requests dropped due to full reply queue"),
1378 /* note that we can really only check load here since otherwise
1379 * peers could find out that we are overloaded by not being
1380 * disconnected after sending us a malformed query... */
1381 tec.priority = bound_priority (ntohl (gm->priority),
1383 if (tec.priority < 0)
1385 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1386 "Dropping query from `%s', this peer is too busy.\n",
1387 GNUNET_i2s (other));
1390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1391 "Received request for `%s' of type %u from peer `%s' with flags %u\n",
1392 GNUNET_h2s (&gm->query),
1393 (unsigned int) tec.type,
1398 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? (&opt[bits++]) : NULL;
1399 options = GSF_PRO_DEFAULTS;
1401 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + tec.priority))
1402 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1403 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value_us * 2 +
1404 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1406 /* don't have BW to send to peer, or would likely take longer than we have for it,
1407 * so at best indirect the query */
1409 options |= GSF_PRO_FORWARD_ONLY;
1410 spid = GNUNET_PEER_intern (other);
1411 GNUNET_assert (0 != spid);
1413 tec.ttl = bound_ttl (ntohl (gm->ttl),
1415 /* decrement ttl (always) */
1417 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1419 if ((tec.ttl < 0) && (((int32_t) (tec.ttl - ttl_decrement)) > 0))
1421 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1422 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1426 GNUNET_STATISTICS_update (GSF_stats,
1428 ("# requests dropped due TTL underflow"), 1,
1430 /* integer underflow => drop (should be very rare)! */
1433 tec.ttl -= ttl_decrement;
1435 /* test if the request already exists */
1436 tec.finished = GNUNET_NO;
1437 GNUNET_CONTAINER_multihashmap_get_multiple (cp->request_map,
1441 if (GNUNET_YES == tec.finished)
1442 return NULL; /* merged into existing request, we're done */
1444 peerreq = GNUNET_new (struct PeerRequest);
1446 pr = GSF_pending_request_create_ (options,
1451 ? (const char *) &opt[bits]
1454 ntohl (gm->filter_mutator),
1456 (uint32_t) tec.priority,
1459 GNUNET_PEER_intern (other),
1460 NULL, 0, /* replies_seen */
1463 GNUNET_assert (NULL != pr);
1464 prd = GSF_pending_request_get_data_ (pr);
1466 GNUNET_break (GNUNET_OK ==
1467 GNUNET_CONTAINER_multihashmap_put (cp->request_map,
1470 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1471 GNUNET_STATISTICS_update (GSF_stats,
1472 gettext_noop ("# P2P query messages received and processed"),
1475 GNUNET_STATISTICS_update (GSF_stats,
1476 gettext_noop ("# P2P searches active"),
1484 * Function called if there has been a timeout trying to satisfy
1485 * a transmission request.
1487 * @param cls the `struct GSF_PeerTransmitHandle` of the request
1490 peer_transmit_timeout (void *cls)
1492 struct GSF_PeerTransmitHandle *pth = cls;
1493 struct GSF_ConnectedPeer *cp;
1495 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1496 "Timeout trying to transmit to other peer\n");
1497 pth->timeout_task = NULL;
1499 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1502 if (GNUNET_YES == pth->is_query)
1503 GNUNET_assert (0 < cp->ppd.pending_queries--);
1504 else if (GNUNET_NO == pth->is_query)
1505 GNUNET_assert (0 < cp->ppd.pending_replies--);
1506 GNUNET_LOAD_update (cp->ppd.transmission_delay,
1508 if (NULL != cp->cth)
1510 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1513 pth->gmc (pth->gmc_cls, 0, NULL);
1514 GNUNET_assert (0 == cp->cth_in_progress);
1520 * Transmit a message to the given peer as soon as possible.
1521 * If the peer disconnects before the transmission can happen,
1522 * the callback is invoked with a `NULL` @a buffer.
1524 * @param cp target peer
1525 * @param is_query is this a query (#GNUNET_YES) or content (#GNUNET_NO) or neither (#GNUNET_SYSERR)
1526 * @param priority how important is this request?
1527 * @param timeout when does this request timeout (call gmc with error)
1528 * @param size number of bytes we would like to send to the peer
1529 * @param gmc function to call to get the message
1530 * @param gmc_cls closure for @a gmc
1531 * @return handle to cancel request
1533 struct GSF_PeerTransmitHandle *
1534 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
1537 struct GNUNET_TIME_Relative timeout,
1539 GSF_GetMessageCallback gmc, void *gmc_cls)
1541 struct GSF_PeerTransmitHandle *pth;
1542 struct GSF_PeerTransmitHandle *pos;
1543 struct GSF_PeerTransmitHandle *prev;
1545 pth = GNUNET_new (struct GSF_PeerTransmitHandle);
1546 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1547 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1549 pth->gmc_cls = gmc_cls;
1551 pth->is_query = is_query;
1552 pth->priority = priority;
1554 /* insertion sort (by priority, descending) */
1557 while ((NULL != pos) && (pos->priority > priority))
1562 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head,
1566 if (GNUNET_YES == is_query)
1567 cp->ppd.pending_queries++;
1568 else if (GNUNET_NO == is_query)
1569 cp->ppd.pending_replies++;
1571 = GNUNET_SCHEDULER_add_delayed (timeout,
1572 &peer_transmit_timeout,
1574 schedule_transmission (pth);
1580 * Cancel an earlier request for transmission.
1582 * @param pth request to cancel
1585 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1587 struct GSF_ConnectedPeer *cp;
1589 if (NULL != pth->timeout_task)
1591 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1592 pth->timeout_task = NULL;
1595 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1598 if (GNUNET_YES == pth->is_query)
1599 GNUNET_assert (0 < cp->ppd.pending_queries--);
1600 else if (GNUNET_NO == pth->is_query)
1601 GNUNET_assert (0 < cp->ppd.pending_replies--);
1607 * Report on receiving a reply; update the performance record of the given peer.
1609 * @param cp responding peer (will be updated)
1610 * @param request_time time at which the original query was transmitted
1611 * @param request_priority priority of the original request
1614 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1615 struct GNUNET_TIME_Absolute request_time,
1616 uint32_t request_priority)
1618 struct GNUNET_TIME_Relative delay;
1620 delay = GNUNET_TIME_absolute_get_duration (request_time);
1621 cp->ppd.avg_reply_delay.rel_value_us =
1622 (cp->ppd.avg_reply_delay.rel_value_us * (RUNAVG_DELAY_N - 1) +
1623 delay.rel_value_us) / RUNAVG_DELAY_N;
1624 cp->ppd.avg_priority =
1625 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1626 request_priority) / RUNAVG_DELAY_N;
1631 * Report on receiving a reply in response to an initiating client.
1632 * Remember that this peer is good for this client.
1634 * @param cp responding peer (will be updated)
1635 * @param initiator_client local client on responsible for query
1638 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1639 struct GSF_LocalClient *initiator_client)
1641 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1642 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1647 * Report on receiving a reply in response to an initiating peer.
1648 * Remember that this peer is good for this initiating peer.
1650 * @param cp responding peer (will be updated)
1651 * @param initiator_peer other peer responsible for query
1654 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1655 const struct GSF_ConnectedPeer *initiator_peer)
1659 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1660 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1661 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1662 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1663 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1668 * Write peer-respect information to a file - flush the buffer entry!
1671 * @param key peer identity
1672 * @param value the `struct GSF_ConnectedPeer` to flush
1673 * @return #GNUNET_OK to continue iteration
1676 flush_respect (void *cls,
1677 const struct GNUNET_PeerIdentity *key,
1680 struct GSF_ConnectedPeer *cp = value;
1681 struct GNUNET_PeerIdentity pid;
1683 if (cp->ppd.respect == cp->disk_respect)
1684 return GNUNET_OK; /* unchanged */
1685 GNUNET_assert (0 != cp->ppd.pid);
1686 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1687 GNUNET_PEERSTORE_store (peerstore, "fs", &pid, "respect", &cp->ppd.respect,
1688 sizeof (cp->ppd.respect),
1689 GNUNET_TIME_UNIT_FOREVER_ABS,
1690 GNUNET_PEERSTORE_STOREOPTION_REPLACE, NULL, NULL);
1696 * A peer disconnected from us. Tear down the connected peer
1700 * @param peer identity of peer that connected
1703 GSF_peer_disconnect_handler_ (void *cls,
1704 const struct GNUNET_PeerIdentity *peer)
1706 struct GSF_ConnectedPeer *cp;
1707 struct GSF_PeerTransmitHandle *pth;
1708 struct GSF_DelayedHandle *dh;
1710 cp = GSF_peer_get_ (peer);
1712 return; /* must have been disconnect from core with
1713 * 'peer' == my_id, ignore */
1714 flush_respect (NULL, peer, cp);
1715 GNUNET_assert (GNUNET_YES ==
1716 GNUNET_CONTAINER_multipeermap_remove (cp_map,
1719 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
1720 GNUNET_CONTAINER_multipeermap_size (cp_map),
1722 if (NULL != cp->respect_iterate_req)
1724 GNUNET_PEERSTORE_iterate_cancel (cp->respect_iterate_req);
1725 cp->respect_iterate_req = NULL;
1727 if (NULL != cp->migration_pth)
1729 GSF_peer_transmit_cancel_ (cp->migration_pth);
1730 cp->migration_pth = NULL;
1734 GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
1737 if (NULL != cp->rc_delay_task)
1739 GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
1740 cp->rc_delay_task = NULL;
1742 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1743 &cancel_pending_request,
1745 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1746 cp->request_map = NULL;
1747 GSF_plan_notify_peer_disconnect_ (cp);
1748 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1749 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies,
1750 P2P_SUCCESS_LIST_SIZE);
1751 memset (cp->ppd.last_p2p_replies,
1753 sizeof (cp->ppd.last_p2p_replies));
1754 GSF_push_stop_ (cp);
1755 if (NULL != cp->cth)
1757 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1760 GNUNET_assert (0 == cp->cth_in_progress);
1761 while (NULL != (pth = cp->pth_head))
1763 if (pth->timeout_task != NULL)
1765 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1766 pth->timeout_task = NULL;
1768 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1771 if (GNUNET_YES == pth->is_query)
1772 GNUNET_assert (0 < cp->ppd.pending_queries--);
1773 else if (GNUNET_NO == pth->is_query)
1774 GNUNET_assert (0 < cp->ppd.pending_replies--);
1775 pth->gmc (pth->gmc_cls, 0, NULL);
1778 while (NULL != (dh = cp->delayed_head))
1780 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
1783 cp->delay_queue_size--;
1784 GNUNET_SCHEDULER_cancel (dh->delay_task);
1785 GNUNET_free (dh->pm);
1788 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1789 if (NULL != cp->mig_revive_task)
1791 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1792 cp->mig_revive_task = NULL;
1794 GNUNET_break (0 == cp->ppd.pending_queries);
1795 GNUNET_break (0 == cp->ppd.pending_replies);
1801 * Closure for #call_iterator().
1803 struct IterationContext
1806 * Function to call on each entry.
1808 GSF_ConnectedPeerIterator it;
1811 * Closure for @e it.
1818 * Function that calls the callback for each peer.
1820 * @param cls the `struct IterationContext *`
1821 * @param key identity of the peer
1822 * @param value the `struct GSF_ConnectedPeer *`
1823 * @return #GNUNET_YES to continue iteration
1826 call_iterator (void *cls,
1827 const struct GNUNET_PeerIdentity *key,
1830 struct IterationContext *ic = cls;
1831 struct GSF_ConnectedPeer *cp = value;
1841 * Iterate over all connected peers.
1843 * @param it function to call for each peer
1844 * @param it_cls closure for @a it
1847 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it,
1850 struct IterationContext ic;
1854 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1861 * Obtain the identity of a connected peer.
1863 * @param cp peer to get identity of
1864 * @param id identity to set (written to)
1867 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1868 struct GNUNET_PeerIdentity *id)
1870 GNUNET_assert (0 != cp->ppd.pid);
1871 GNUNET_PEER_resolve (cp->ppd.pid, id);
1876 * Obtain the identity of a connected peer.
1878 * @param cp peer to get identity of
1879 * @return reference to peer identity, valid until peer disconnects (!)
1881 const struct GNUNET_PeerIdentity *
1882 GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp)
1884 GNUNET_assert (0 != cp->ppd.pid);
1885 return GNUNET_PEER_resolve2 (cp->ppd.pid);
1890 * Assemble a migration stop message for transmission.
1892 * @param cls the `struct GSF_ConnectedPeer` to use
1893 * @param size number of bytes we're allowed to write to @a buf
1894 * @param buf where to copy the message
1895 * @return number of bytes copied to @a buf
1898 create_migration_stop_message (void *cls,
1902 struct GSF_ConnectedPeer *cp = cls;
1903 struct MigrationStopMessage msm;
1905 cp->migration_pth = NULL;
1908 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1909 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1910 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1911 msm.reserved = htonl (0);
1913 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1914 (cp->last_migration_block));
1915 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1916 GNUNET_STATISTICS_update (GSF_stats,
1917 gettext_noop ("# migration stop messages sent"),
1919 return sizeof (struct MigrationStopMessage);
1924 * Ask a peer to stop migrating data to us until the given point
1927 * @param cp peer to ask
1928 * @param block_time until when to block
1931 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1932 struct GNUNET_TIME_Absolute block_time)
1934 if (cp->last_migration_block.abs_value_us > block_time.abs_value_us)
1936 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1937 "Migration already blocked for another %s\n",
1938 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining
1939 (cp->last_migration_block), GNUNET_YES));
1940 return; /* already blocked */
1942 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %s\n",
1943 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (block_time),
1945 cp->last_migration_block = block_time;
1946 if (NULL != cp->migration_pth)
1947 GSF_peer_transmit_cancel_ (cp->migration_pth);
1949 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1950 GNUNET_TIME_UNIT_FOREVER_REL,
1951 sizeof (struct MigrationStopMessage),
1952 &create_migration_stop_message, cp);
1957 * Notify core about a preference we have for the given peer
1958 * (to allocate more resources towards it). The change will
1959 * be communicated the next time we reserve bandwidth with
1960 * core (not instantly).
1962 * @param cp peer to reserve bandwidth from
1963 * @param pref preference change
1966 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1969 cp->inc_preference += pref;
1974 * Call this method periodically to flush respect information to disk.
1976 * @param cls closure, not used
1979 cron_flush_respect (void *cls)
1982 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1985 fr_task = GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
1986 GNUNET_SCHEDULER_PRIORITY_HIGH,
1987 &cron_flush_respect, NULL);
1992 * Initialize peer management subsystem.
1995 GSF_connected_peer_init_ ()
1997 cp_map = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
1998 peerstore = GNUNET_PEERSTORE_connect (GSF_cfg);
1999 fr_task = GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
2000 &cron_flush_respect, NULL);
2005 * Iterator to free peer entries.
2007 * @param cls closure, unused
2008 * @param key current key code
2009 * @param value value in the hash map (peer entry)
2010 * @return #GNUNET_YES (we should continue to iterate)
2013 clean_peer (void *cls,
2014 const struct GNUNET_PeerIdentity *key,
2017 GSF_peer_disconnect_handler_ (NULL, key);
2023 * Shutdown peer management subsystem.
2026 GSF_connected_peer_done_ ()
2028 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
2031 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
2034 GNUNET_SCHEDULER_cancel (fr_task);
2036 GNUNET_CONTAINER_multipeermap_destroy (cp_map);
2038 GNUNET_PEERSTORE_disconnect (peerstore,
2045 * Iterator to remove references to LC entry.
2047 * @param cls the `struct GSF_LocalClient *` to look for
2048 * @param key current key code
2049 * @param value value in the hash map (peer entry)
2050 * @return #GNUNET_YES (we should continue to iterate)
2053 clean_local_client (void *cls,
2054 const struct GNUNET_PeerIdentity *key,
2057 const struct GSF_LocalClient *lc = cls;
2058 struct GSF_ConnectedPeer *cp = value;
2061 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
2062 if (cp->ppd.last_client_replies[i] == lc)
2063 cp->ppd.last_client_replies[i] = NULL;
2069 * Notification that a local client disconnected. Clean up all of our
2070 * references to the given handle.
2072 * @param lc handle to the local client (henceforth invalid)
2075 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
2078 return; /* already cleaned up */
2079 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_local_client,
2084 /* end of gnunet-service-fs_cp.c */