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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;
340 * Update the latency information kept for the given peer.
342 * @param id peer record to update
343 * @param latency current latency value
346 GSF_update_peer_latency_ (const struct GNUNET_PeerIdentity *id,
347 struct GNUNET_TIME_Relative latency)
349 struct GSF_ConnectedPeer *cp;
351 cp = GSF_peer_get_ (id);
353 return; /* we're not yet connected at the core level, ignore */
354 GNUNET_LOAD_value_set_decline (cp->ppd.transmission_delay,
360 * Return the performance data record for the given peer
362 * @param cp peer to query
363 * @return performance data record for the peer
365 struct GSF_PeerPerformanceData *
366 GSF_get_peer_performance_data_ (struct GSF_ConnectedPeer *cp)
373 * Core is ready to transmit to a peer, get the message.
375 * @param cls the `struct GSF_PeerTransmitHandle` of the message
376 * @param size number of bytes core is willing to take
377 * @param buf where to copy the message
378 * @return number of bytes copied to @a buf
381 peer_transmit_ready_cb (void *cls,
387 * Function called by core upon success or failure of our bandwidth reservation request.
389 * @param cls the `struct GSF_ConnectedPeer` of the peer for which we made the request
390 * @param peer identifies the peer
391 * @param amount set to the amount that was actually reserved or unreserved;
392 * either the full requested amount or zero (no partial reservations)
393 * @param res_delay if the reservation could not be satisfied (amount was 0), how
394 * long should the client wait until re-trying?
397 ats_reserve_callback (void *cls,
398 const struct GNUNET_PeerIdentity *peer,
400 struct GNUNET_TIME_Relative res_delay);
404 * If ready (bandwidth reserved), try to schedule transmission via
405 * core for the given handle.
407 * @param pth transmission handle to schedule
410 schedule_transmission (struct GSF_PeerTransmitHandle *pth)
412 struct GSF_ConnectedPeer *cp;
413 struct GNUNET_PeerIdentity target;
416 if ((NULL != cp->cth) || (0 != cp->cth_in_progress))
417 return; /* already done */
418 GNUNET_assert (0 != cp->ppd.pid);
419 GNUNET_PEER_resolve (cp->ppd.pid, &target);
421 if (0 != cp->inc_preference)
423 GNUNET_ATS_performance_change_preference (GSF_ats,
425 GNUNET_ATS_PREFERENCE_BANDWIDTH,
426 (double) cp->inc_preference,
427 GNUNET_ATS_PREFERENCE_END);
428 cp->inc_preference = 0;
431 if ( (GNUNET_YES == pth->is_query) &&
432 (GNUNET_YES != pth->was_reserved) )
434 /* query, need reservation */
435 if (GNUNET_YES != cp->did_reserve)
436 return; /* not ready */
437 cp->did_reserve = GNUNET_NO;
438 /* reservation already done! */
439 pth->was_reserved = GNUNET_YES;
440 cp->rc = GNUNET_ATS_reserve_bandwidth (GSF_ats,
443 &ats_reserve_callback,
447 GNUNET_assert (NULL == cp->cth);
448 cp->cth_in_progress++;
450 GNUNET_CORE_notify_transmit_ready (GSF_core,
452 GNUNET_CORE_PRIO_BACKGROUND,
453 GNUNET_TIME_absolute_get_remaining (pth->timeout),
456 &peer_transmit_ready_cb, cp);
457 GNUNET_assert (NULL != cp->cth);
458 GNUNET_assert (0 < cp->cth_in_progress--);
463 * Core is ready to transmit to a peer, get the message.
465 * @param cls the `struct GSF_PeerTransmitHandle` of the message
466 * @param size number of bytes core is willing to take
467 * @param buf where to copy the message
468 * @return number of bytes copied to @a buf
471 peer_transmit_ready_cb (void *cls,
475 struct GSF_ConnectedPeer *cp = cls;
476 struct GSF_PeerTransmitHandle *pth = cp->pth_head;
477 struct GSF_PeerTransmitHandle *pos;
483 if (pth->size > size)
485 schedule_transmission (pth);
488 if (NULL != pth->timeout_task)
490 GNUNET_SCHEDULER_cancel (pth->timeout_task);
491 pth->timeout_task = NULL;
493 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
496 if (GNUNET_YES == pth->is_query)
498 cp->ppd.last_request_times[(cp->last_request_times_off++) %
499 MAX_QUEUE_PER_PEER] =
500 GNUNET_TIME_absolute_get ();
501 GNUNET_assert (0 < cp->ppd.pending_queries--);
503 else if (GNUNET_NO == pth->is_query)
505 GNUNET_assert (0 < cp->ppd.pending_replies--);
507 GNUNET_LOAD_update (cp->ppd.transmission_delay,
508 GNUNET_TIME_absolute_get_duration
509 (pth->transmission_request_start_time).rel_value_us);
510 ret = pth->gmc (pth->gmc_cls, size, buf);
511 if (NULL != (pos = cp->pth_head))
513 GNUNET_assert (pos != pth);
514 schedule_transmission (pos);
522 * (re)try to reserve bandwidth from the given peer.
524 * @param cls the `struct GSF_ConnectedPeer` to reserve from
527 retry_reservation (void *cls)
529 struct GSF_ConnectedPeer *cp = cls;
530 struct GNUNET_PeerIdentity target;
532 GNUNET_PEER_resolve (cp->ppd.pid, &target);
533 cp->rc_delay_task = NULL;
535 GNUNET_ATS_reserve_bandwidth (GSF_ats,
538 &ats_reserve_callback, cp);
543 * Function called by core upon success or failure of our bandwidth reservation request.
545 * @param cls the `struct GSF_ConnectedPeer` of the peer for which we made the request
546 * @param peer identifies the peer
547 * @param amount set to the amount that was actually reserved or unreserved;
548 * either the full requested amount or zero (no partial reservations)
549 * @param res_delay if the reservation could not be satisfied (amount was 0), how
550 * long should the client wait until re-trying?
553 ats_reserve_callback (void *cls,
554 const struct GNUNET_PeerIdentity *peer,
556 struct GNUNET_TIME_Relative res_delay)
558 struct GSF_ConnectedPeer *cp = cls;
559 struct GSF_PeerTransmitHandle *pth;
561 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
562 "Reserved %d bytes / need to wait %s for reservation\n",
564 GNUNET_STRINGS_relative_time_to_string (res_delay, GNUNET_YES));
569 GNUNET_SCHEDULER_add_delayed (res_delay,
574 cp->did_reserve = GNUNET_YES;
576 if ( (NULL != pth) &&
578 (0 == cp->cth_in_progress) )
580 /* reservation success, try transmission now! */
581 cp->cth_in_progress++;
583 GNUNET_CORE_notify_transmit_ready (GSF_core,
585 GNUNET_CORE_PRIO_BACKGROUND,
586 GNUNET_TIME_absolute_get_remaining (pth->timeout),
589 &peer_transmit_ready_cb,
591 GNUNET_assert (NULL != cp->cth);
592 GNUNET_assert (0 < cp->cth_in_progress--);
598 * Function called by PEERSTORE with peer respect record
600 * @param cls handle to connected peer entry
601 * @param record peerstore record information
602 * @param emsg error message, or NULL if no errors
603 * @return #GNUNET_NO to stop iterating since we only expect 0 or 1 records
606 peer_respect_cb (void *cls,
607 const struct GNUNET_PEERSTORE_Record *record,
610 struct GSF_ConnectedPeer *cp = cls;
612 GNUNET_assert (NULL != cp->respect_iterate_req);
613 cp->respect_iterate_req = NULL;
614 if ((NULL != record) && (sizeof (cp->disk_respect) == record->value_size))
615 cp->disk_respect = cp->ppd.respect = *((uint32_t *)record->value);
616 GSF_push_start_ (cp);
617 if (NULL != cp->creation_cb)
618 cp->creation_cb (cp->creation_cb_cls, cp);
624 * A peer connected to us. Setup the connected peer
627 * @param peer identity of peer that connected
628 * @param creation_cb callback function when the record is created.
629 * @param creation_cb_cls closure for @creation_cb
632 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
633 GSF_ConnectedPeerCreationCallback creation_cb,
634 void *creation_cb_cls)
636 struct GSF_ConnectedPeer *cp;
638 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
639 "Connected to peer %s\n",
641 cp = GNUNET_new (struct GSF_ConnectedPeer);
642 cp->ppd.pid = GNUNET_PEER_intern (peer);
643 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
645 GNUNET_ATS_reserve_bandwidth (GSF_ats,
648 &ats_reserve_callback, cp);
649 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128,
651 GNUNET_break (GNUNET_OK ==
652 GNUNET_CONTAINER_multipeermap_put (cp_map,
653 GSF_connected_peer_get_identity2_ (cp),
655 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
656 GNUNET_STATISTICS_set (GSF_stats,
657 gettext_noop ("# peers connected"),
658 GNUNET_CONTAINER_multipeermap_size (cp_map),
660 cp->creation_cb = creation_cb;
661 cp->creation_cb_cls = creation_cb_cls;
662 cp->respect_iterate_req =
663 GNUNET_PEERSTORE_iterate (peerstore, "fs",
665 GNUNET_TIME_UNIT_FOREVER_REL,
672 * It may be time to re-start migrating content to this
673 * peer. Check, and if so, restart migration.
675 * @param cls the `struct GSF_ConnectedPeer`
678 revive_migration (void *cls)
680 struct GSF_ConnectedPeer *cp = cls;
681 struct GNUNET_TIME_Relative bt;
683 cp->mig_revive_task = NULL;
684 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
685 if (0 != bt.rel_value_us)
687 /* still time left... */
688 cp->mig_revive_task =
689 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
692 GSF_push_start_ (cp);
697 * Get a handle for a connected peer.
699 * @param peer peer's identity
700 * @return NULL if the peer is not currently connected
702 struct GSF_ConnectedPeer *
703 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
707 return GNUNET_CONTAINER_multipeermap_get (cp_map, peer);
712 * Handle P2P "MIGRATION_STOP" message.
714 * @param cls closure, always NULL
715 * @param other the other peer involved (sender or receiver, NULL
716 * for loopback messages where we are both sender and receiver)
717 * @param message the actual message
718 * @return #GNUNET_OK to keep the connection open,
719 * #GNUNET_SYSERR to close it (signal serious error)
722 GSF_handle_p2p_migration_stop_ (void *cls,
723 const struct GNUNET_PeerIdentity *other,
724 const struct GNUNET_MessageHeader *message)
726 struct GSF_ConnectedPeer *cp;
727 const struct MigrationStopMessage *msm;
728 struct GNUNET_TIME_Relative bt;
730 msm = (const struct MigrationStopMessage *) message;
731 cp = GSF_peer_get_ (other);
737 GNUNET_STATISTICS_update (GSF_stats,
738 gettext_noop ("# migration stop messages received"),
740 bt = GNUNET_TIME_relative_ntoh (msm->duration);
741 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
742 _("Migration of content to peer `%s' blocked for %s\n"),
744 GNUNET_STRINGS_relative_time_to_string (bt, GNUNET_YES));
745 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
746 if ( (NULL == cp->mig_revive_task) &&
747 (NULL == cp->respect_iterate_req) )
750 cp->mig_revive_task =
751 GNUNET_SCHEDULER_add_delayed (bt,
752 &revive_migration, cp);
759 * Copy reply and free put message.
761 * @param cls the `struct PutMessage`
762 * @param buf_size number of bytes available in @a buf
763 * @param buf where to copy the message, NULL on error (peer disconnect)
764 * @return number of bytes copied to @a buf, can be 0 (without indicating an error)
767 copy_reply (void *cls,
771 struct PutMessage *pm = cls;
776 GNUNET_assert (buf_size >= ntohs (pm->header.size));
777 size = ntohs (pm->header.size);
778 memcpy (buf, pm, size);
779 GNUNET_STATISTICS_update (GSF_stats,
780 gettext_noop ("# replies transmitted to other peers"),
787 GNUNET_STATISTICS_update (GSF_stats,
788 gettext_noop ("# replies dropped"),
798 * Free resources associated with the given peer request.
800 * @param peerreq request to free
803 free_pending_request (struct PeerRequest *peerreq)
805 struct GSF_ConnectedPeer *cp = peerreq->cp;
806 struct GSF_PendingRequestData *prd;
808 prd = GSF_pending_request_get_data_ (peerreq->pr);
809 if (NULL != peerreq->kill_task)
811 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
812 peerreq->kill_task = NULL;
814 GNUNET_STATISTICS_update (GSF_stats,
815 gettext_noop ("# P2P searches active"),
818 GNUNET_break (GNUNET_YES ==
819 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
822 GNUNET_free (peerreq);
827 * Cancel all requests associated with the peer.
830 * @param query hash code of the request
831 * @param value the `struct GSF_PendingRequest`
832 * @return #GNUNET_YES (continue to iterate)
835 cancel_pending_request (void *cls,
836 const struct GNUNET_HashCode *query,
839 struct PeerRequest *peerreq = value;
840 struct GSF_PendingRequest *pr = peerreq->pr;
842 free_pending_request (peerreq);
843 GSF_pending_request_cancel_ (pr,
850 * Free the given request.
852 * @param cls the request to free
855 peer_request_destroy (void *cls)
857 struct PeerRequest *peerreq = cls;
858 struct GSF_PendingRequest *pr = peerreq->pr;
859 struct GSF_PendingRequestData *prd;
861 peerreq->kill_task = NULL;
862 prd = GSF_pending_request_get_data_ (pr);
863 cancel_pending_request (NULL,
870 * The artificial delay is over, transmit the message now.
872 * @param cls the `struct GSF_DelayedHandle` with the message
875 transmit_delayed_now (void *cls)
877 struct GSF_DelayedHandle *dh = cls;
878 struct GSF_ConnectedPeer *cp = dh->cp;
879 const struct GNUNET_SCHEDULER_TaskContext *tc;
881 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
884 cp->delay_queue_size--;
885 tc = GNUNET_SCHEDULER_get_task_context ();
886 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
888 GNUNET_free (dh->pm);
892 (void) GSF_peer_transmit_ (cp,
904 * Get the randomized delay a response should be subjected to.
906 * @return desired delay
908 static struct GNUNET_TIME_Relative
909 get_randomized_delay ()
911 struct GNUNET_TIME_Relative ret;
914 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
915 GNUNET_CRYPTO_random_u32
916 (GNUNET_CRYPTO_QUALITY_WEAK,
917 2 * GSF_avg_latency.rel_value_us + 1));
918 #if INSANE_STATISTICS
919 GNUNET_STATISTICS_update (GSF_stats,
921 ("# artificial delays introduced (ms)"),
922 ret.rel_value_us / 1000LL, GNUNET_NO);
929 * Handle a reply to a pending request. Also called if a request
930 * expires (then with data == NULL). The handler may be called
931 * many times (depending on the request type), but will not be
932 * called during or after a call to GSF_pending_request_cancel
933 * and will also not be called anymore after a call signalling
936 * @param cls `struct PeerRequest` this is an answer for
937 * @param eval evaluation of the result
938 * @param pr handle to the original pending request
939 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
940 * @param expiration when does @a data expire?
941 * @param last_transmission when did we last transmit a request for this block
942 * @param type type of the block
943 * @param data response data, NULL on request expiration
944 * @param data_len number of bytes in @a data
947 handle_p2p_reply (void *cls,
948 enum GNUNET_BLOCK_EvaluationResult eval,
949 struct GSF_PendingRequest *pr,
950 uint32_t reply_anonymity_level,
951 struct GNUNET_TIME_Absolute expiration,
952 struct GNUNET_TIME_Absolute last_transmission,
953 enum GNUNET_BLOCK_Type type,
957 struct PeerRequest *peerreq = cls;
958 struct GSF_ConnectedPeer *cp = peerreq->cp;
959 struct GSF_PendingRequestData *prd;
960 struct PutMessage *pm;
963 GNUNET_assert (data_len + sizeof (struct PutMessage) <
964 GNUNET_SERVER_MAX_MESSAGE_SIZE);
965 GNUNET_assert (peerreq->pr == pr);
966 prd = GSF_pending_request_get_data_ (pr);
969 free_pending_request (peerreq);
972 GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
973 if ((prd->type != type) && (GNUNET_BLOCK_TYPE_ANY != prd->type))
975 GNUNET_STATISTICS_update (GSF_stats,
977 ("# replies dropped due to type mismatch"),
981 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
982 "Transmitting result for query `%s' to peer\n",
983 GNUNET_h2s (&prd->query));
984 GNUNET_STATISTICS_update (GSF_stats,
985 gettext_noop ("# replies received for other peers"),
987 msize = sizeof (struct PutMessage) + data_len;
988 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
993 if ((UINT32_MAX != reply_anonymity_level) && (reply_anonymity_level > 1))
995 if (reply_anonymity_level - 1 > GSF_cover_content_count)
997 GNUNET_STATISTICS_update (GSF_stats,
999 ("# replies dropped due to insufficient cover traffic"),
1003 GSF_cover_content_count -= (reply_anonymity_level - 1);
1006 pm = GNUNET_malloc (msize);
1007 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
1008 pm->header.size = htons (msize);
1009 pm->type = htonl (type);
1010 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
1011 memcpy (&pm[1], data, data_len);
1012 if ( (UINT32_MAX != reply_anonymity_level) &&
1013 (0 != reply_anonymity_level) &&
1014 (GNUNET_YES == GSF_enable_randomized_delays) )
1016 struct GSF_DelayedHandle *dh;
1018 dh = GNUNET_new (struct GSF_DelayedHandle);
1022 GNUNET_CONTAINER_DLL_insert (cp->delayed_head,
1025 cp->delay_queue_size++;
1027 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
1028 &transmit_delayed_now,
1033 (void) GSF_peer_transmit_ (cp,
1041 if (GNUNET_BLOCK_EVALUATION_OK_LAST != eval)
1043 if (NULL == peerreq->kill_task)
1045 GNUNET_STATISTICS_update (GSF_stats,
1047 ("# P2P searches destroyed due to ultimate reply"),
1050 peerreq->kill_task =
1051 GNUNET_SCHEDULER_add_now (&peer_request_destroy,
1058 * Increase the peer's respect by a value.
1060 * @param cp which peer to change the respect value on
1061 * @param value is the int value by which the
1062 * peer's credit is to be increased or decreased
1063 * @returns the actual change in respect (positive or negative)
1066 change_peer_respect (struct GSF_ConnectedPeer *cp, int value)
1070 GNUNET_assert (NULL != cp);
1073 if (cp->ppd.respect + value < cp->ppd.respect)
1075 value = UINT32_MAX - cp->ppd.respect;
1076 cp->ppd.respect = UINT32_MAX;
1079 cp->ppd.respect += value;
1083 if (cp->ppd.respect < -value)
1085 value = -cp->ppd.respect;
1086 cp->ppd.respect = 0;
1089 cp->ppd.respect += value;
1096 * We've received a request with the specified priority. Bound it
1097 * according to how much we respect the given peer.
1099 * @param prio_in requested priority
1100 * @param cp the peer making the request
1101 * @return effective priority
1104 bound_priority (uint32_t prio_in,
1105 struct GSF_ConnectedPeer *cp)
1107 #define N ((double)128.0)
1112 ld = GSF_test_get_load_too_high_ (0);
1113 if (GNUNET_SYSERR == ld)
1115 #if INSANE_STATISTICS
1116 GNUNET_STATISTICS_update (GSF_stats,
1118 ("# requests done for free (low load)"), 1,
1121 return 0; /* excess resources */
1123 if (prio_in > INT32_MAX)
1124 prio_in = INT32_MAX;
1125 ret = -change_peer_respect (cp, -(int) prio_in);
1128 if (ret > GSF_current_priorities + N)
1129 rret = GSF_current_priorities + N;
1132 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1134 if ((GNUNET_YES == ld) && (ret > 0))
1136 /* try with charging */
1137 ld = GSF_test_get_load_too_high_ (ret);
1139 if (GNUNET_YES == ld)
1141 GNUNET_STATISTICS_update (GSF_stats,
1143 ("# request dropped, priority insufficient"), 1,
1146 change_peer_respect (cp, (int) ret);
1147 return -1; /* not enough resources */
1151 GNUNET_STATISTICS_update (GSF_stats,
1153 ("# requests done for a price (normal load)"), 1,
1162 * The priority level imposes a bound on the maximum
1163 * value for the ttl that can be requested.
1165 * @param ttl_in requested ttl
1166 * @param prio given priority
1167 * @return @a ttl_in if @a ttl_in is below the limit,
1168 * otherwise the ttl-limit for the given @a prio
1171 bound_ttl (int32_t ttl_in,
1174 unsigned long long allowed;
1178 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1179 if (ttl_in > allowed)
1181 if (allowed >= (1 << 30))
1190 * Closure for #test_exist_cb().
1192 struct TestExistClosure
1196 * Priority of the incoming request.
1201 * Relative TTL of the incoming request.
1206 * Type of the incoming request.
1208 enum GNUNET_BLOCK_Type type;
1211 * Set to #GNUNET_YES if we are done handling the query.
1219 * Test if the query already exists. If so, merge it, otherwise
1220 * keep `finished` at #GNUNET_NO.
1222 * @param cls our `struct TestExistClosure`
1223 * @param hc the key of the query
1224 * @param value the existing `struct PeerRequest`.
1225 * @return #GNUNET_YES to continue to iterate,
1226 * #GNUNET_NO if we successfully merged
1229 test_exist_cb (void *cls,
1230 const struct GNUNET_HashCode *hc,
1233 struct TestExistClosure *tec = cls;
1234 struct PeerRequest *peerreq = value;
1235 struct GSF_PendingRequest *pr;
1236 struct GSF_PendingRequestData *prd;
1239 prd = GSF_pending_request_get_data_ (pr);
1240 if (prd->type != tec->type)
1242 if (prd->ttl.abs_value_us >=
1243 GNUNET_TIME_absolute_get ().abs_value_us + tec->ttl * 1000LL)
1245 /* existing request has higher TTL, drop new one! */
1246 prd->priority += tec->priority;
1247 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1248 "Have existing request with higher TTL, dropping new request.\n");
1249 GNUNET_STATISTICS_update (GSF_stats,
1251 ("# requests dropped due to higher-TTL request"),
1253 tec->finished = GNUNET_YES;
1256 /* existing request has lower TTL, drop old one! */
1257 tec->priority += prd->priority;
1258 free_pending_request (peerreq);
1259 GSF_pending_request_cancel_ (pr,
1266 * Handle P2P "QUERY" message. Creates the pending request entry
1267 * and sets up all of the data structures to that we will
1268 * process replies properly. Does not initiate forwarding or
1269 * local database lookups.
1271 * @param other the other peer involved (sender or receiver, NULL
1272 * for loopback messages where we are both sender and receiver)
1273 * @param message the actual message
1274 * @return pending request handle, NULL on error
1276 struct GSF_PendingRequest *
1277 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1278 const struct GNUNET_MessageHeader *message)
1280 struct PeerRequest *peerreq;
1281 struct GSF_PendingRequest *pr;
1282 struct GSF_ConnectedPeer *cp;
1283 struct GSF_ConnectedPeer *cps;
1284 const struct GNUNET_PeerIdentity *target;
1285 enum GSF_PendingRequestOptions options;
1287 const struct GetMessage *gm;
1289 const struct GNUNET_PeerIdentity *opt;
1292 uint32_t ttl_decrement;
1293 struct TestExistClosure tec;
1294 GNUNET_PEER_Id spid;
1295 const struct GSF_PendingRequestData *prd;
1297 msize = ntohs (message->size);
1298 if (msize < sizeof (struct GetMessage))
1300 GNUNET_break_op (0);
1303 GNUNET_STATISTICS_update (GSF_stats,
1305 ("# GET requests received (from other peers)"),
1308 gm = (const struct GetMessage *) message;
1309 tec.type = ntohl (gm->type);
1310 bm = ntohl (gm->hash_bitmap);
1318 if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_PeerIdentity))
1320 GNUNET_break_op (0);
1323 opt = (const struct GNUNET_PeerIdentity *) &gm[1];
1324 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_PeerIdentity);
1325 /* bfsize must be power of 2, check! */
1326 if (0 != ((bfsize - 1) & bfsize))
1328 GNUNET_break_op (0);
1331 GSF_cover_query_count++;
1332 bm = ntohl (gm->hash_bitmap);
1334 cps = GSF_peer_get_ (other);
1337 /* peer must have just disconnected */
1338 GNUNET_STATISTICS_update (GSF_stats,
1340 ("# requests dropped due to initiator not being connected"),
1344 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1345 cp = GSF_peer_get_ (&opt[bits++]);
1350 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1351 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1352 "Failed to find RETURN-TO peer `%s' in connection set. Dropping query.\n",
1353 GNUNET_i2s (&opt[bits - 1]));
1356 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1357 "Failed to find peer `%s' in connection set. Dropping query.\n",
1358 GNUNET_i2s (other));
1359 GNUNET_STATISTICS_update (GSF_stats,
1361 ("# requests dropped due to missing reverse route"),
1366 if (cp->ppd.pending_replies + cp->delay_queue_size > MAX_QUEUE_PER_PEER)
1368 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1369 "Peer `%s' has too many replies queued already. Dropping query.\n",
1370 GNUNET_i2s (other));
1371 GNUNET_STATISTICS_update (GSF_stats,
1372 gettext_noop ("# requests dropped due to full reply queue"),
1377 /* note that we can really only check load here since otherwise
1378 * peers could find out that we are overloaded by not being
1379 * disconnected after sending us a malformed query... */
1380 tec.priority = bound_priority (ntohl (gm->priority),
1382 if (tec.priority < 0)
1384 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1385 "Dropping query from `%s', this peer is too busy.\n",
1386 GNUNET_i2s (other));
1389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1390 "Received request for `%s' of type %u from peer `%s' with flags %u\n",
1391 GNUNET_h2s (&gm->query),
1392 (unsigned int) tec.type,
1397 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? (&opt[bits++]) : NULL;
1398 options = GSF_PRO_DEFAULTS;
1400 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + tec.priority))
1401 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1402 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value_us * 2 +
1403 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1405 /* don't have BW to send to peer, or would likely take longer than we have for it,
1406 * so at best indirect the query */
1408 options |= GSF_PRO_FORWARD_ONLY;
1409 spid = GNUNET_PEER_intern (other);
1410 GNUNET_assert (0 != spid);
1412 tec.ttl = bound_ttl (ntohl (gm->ttl),
1414 /* decrement ttl (always) */
1416 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1418 if ((tec.ttl < 0) && (((int32_t) (tec.ttl - ttl_decrement)) > 0))
1420 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1421 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1425 GNUNET_STATISTICS_update (GSF_stats,
1427 ("# requests dropped due TTL underflow"), 1,
1429 /* integer underflow => drop (should be very rare)! */
1432 tec.ttl -= ttl_decrement;
1434 /* test if the request already exists */
1435 tec.finished = GNUNET_NO;
1436 GNUNET_CONTAINER_multihashmap_get_multiple (cp->request_map,
1440 if (GNUNET_YES == tec.finished)
1441 return NULL; /* merged into existing request, we're done */
1443 peerreq = GNUNET_new (struct PeerRequest);
1445 pr = GSF_pending_request_create_ (options,
1450 ? (const char *) &opt[bits]
1453 ntohl (gm->filter_mutator),
1455 (uint32_t) tec.priority,
1458 GNUNET_PEER_intern (other),
1459 NULL, 0, /* replies_seen */
1462 GNUNET_assert (NULL != pr);
1463 prd = GSF_pending_request_get_data_ (pr);
1465 GNUNET_break (GNUNET_OK ==
1466 GNUNET_CONTAINER_multihashmap_put (cp->request_map,
1469 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1470 GNUNET_STATISTICS_update (GSF_stats,
1471 gettext_noop ("# P2P query messages received and processed"),
1474 GNUNET_STATISTICS_update (GSF_stats,
1475 gettext_noop ("# P2P searches active"),
1483 * Function called if there has been a timeout trying to satisfy
1484 * a transmission request.
1486 * @param cls the `struct GSF_PeerTransmitHandle` of the request
1489 peer_transmit_timeout (void *cls)
1491 struct GSF_PeerTransmitHandle *pth = cls;
1492 struct GSF_ConnectedPeer *cp;
1494 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1495 "Timeout trying to transmit to other peer\n");
1496 pth->timeout_task = NULL;
1498 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1501 if (GNUNET_YES == pth->is_query)
1502 GNUNET_assert (0 < cp->ppd.pending_queries--);
1503 else if (GNUNET_NO == pth->is_query)
1504 GNUNET_assert (0 < cp->ppd.pending_replies--);
1505 GNUNET_LOAD_update (cp->ppd.transmission_delay,
1507 if (NULL != cp->cth)
1509 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1512 pth->gmc (pth->gmc_cls, 0, NULL);
1513 GNUNET_assert (0 == cp->cth_in_progress);
1519 * Transmit a message to the given peer as soon as possible.
1520 * If the peer disconnects before the transmission can happen,
1521 * the callback is invoked with a `NULL` @a buffer.
1523 * @param cp target peer
1524 * @param is_query is this a query (#GNUNET_YES) or content (#GNUNET_NO) or neither (#GNUNET_SYSERR)
1525 * @param priority how important is this request?
1526 * @param timeout when does this request timeout (call gmc with error)
1527 * @param size number of bytes we would like to send to the peer
1528 * @param gmc function to call to get the message
1529 * @param gmc_cls closure for @a gmc
1530 * @return handle to cancel request
1532 struct GSF_PeerTransmitHandle *
1533 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
1536 struct GNUNET_TIME_Relative timeout,
1538 GSF_GetMessageCallback gmc, void *gmc_cls)
1540 struct GSF_PeerTransmitHandle *pth;
1541 struct GSF_PeerTransmitHandle *pos;
1542 struct GSF_PeerTransmitHandle *prev;
1544 pth = GNUNET_new (struct GSF_PeerTransmitHandle);
1545 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1546 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1548 pth->gmc_cls = gmc_cls;
1550 pth->is_query = is_query;
1551 pth->priority = priority;
1553 /* insertion sort (by priority, descending) */
1556 while ((NULL != pos) && (pos->priority > priority))
1561 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head,
1565 if (GNUNET_YES == is_query)
1566 cp->ppd.pending_queries++;
1567 else if (GNUNET_NO == is_query)
1568 cp->ppd.pending_replies++;
1570 = GNUNET_SCHEDULER_add_delayed (timeout,
1571 &peer_transmit_timeout,
1573 schedule_transmission (pth);
1579 * Cancel an earlier request for transmission.
1581 * @param pth request to cancel
1584 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1586 struct GSF_ConnectedPeer *cp;
1588 if (NULL != pth->timeout_task)
1590 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1591 pth->timeout_task = NULL;
1594 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1597 if (GNUNET_YES == pth->is_query)
1598 GNUNET_assert (0 < cp->ppd.pending_queries--);
1599 else if (GNUNET_NO == pth->is_query)
1600 GNUNET_assert (0 < cp->ppd.pending_replies--);
1606 * Report on receiving a reply; update the performance record of the given peer.
1608 * @param cp responding peer (will be updated)
1609 * @param request_time time at which the original query was transmitted
1610 * @param request_priority priority of the original request
1613 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1614 struct GNUNET_TIME_Absolute request_time,
1615 uint32_t request_priority)
1617 struct GNUNET_TIME_Relative delay;
1619 delay = GNUNET_TIME_absolute_get_duration (request_time);
1620 cp->ppd.avg_reply_delay.rel_value_us =
1621 (cp->ppd.avg_reply_delay.rel_value_us * (RUNAVG_DELAY_N - 1) +
1622 delay.rel_value_us) / RUNAVG_DELAY_N;
1623 cp->ppd.avg_priority =
1624 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1625 request_priority) / RUNAVG_DELAY_N;
1630 * Report on receiving a reply in response to an initiating client.
1631 * Remember that this peer is good for this client.
1633 * @param cp responding peer (will be updated)
1634 * @param initiator_client local client on responsible for query
1637 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1638 struct GSF_LocalClient *initiator_client)
1640 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1641 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1646 * Report on receiving a reply in response to an initiating peer.
1647 * Remember that this peer is good for this initiating peer.
1649 * @param cp responding peer (will be updated)
1650 * @param initiator_peer other peer responsible for query
1653 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1654 const struct GSF_ConnectedPeer *initiator_peer)
1658 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1659 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1660 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1661 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1662 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1667 * Write peer-respect information to a file - flush the buffer entry!
1670 * @param key peer identity
1671 * @param value the `struct GSF_ConnectedPeer` to flush
1672 * @return #GNUNET_OK to continue iteration
1675 flush_respect (void *cls,
1676 const struct GNUNET_PeerIdentity *key,
1679 struct GSF_ConnectedPeer *cp = value;
1680 struct GNUNET_PeerIdentity pid;
1682 if (cp->ppd.respect == cp->disk_respect)
1683 return GNUNET_OK; /* unchanged */
1684 GNUNET_assert (0 != cp->ppd.pid);
1685 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1686 GNUNET_PEERSTORE_store (peerstore, "fs", &pid, "respect", &cp->ppd.respect,
1687 sizeof (cp->ppd.respect),
1688 GNUNET_TIME_UNIT_FOREVER_ABS,
1689 GNUNET_PEERSTORE_STOREOPTION_REPLACE, NULL, NULL);
1695 * A peer disconnected from us. Tear down the connected peer
1699 * @param peer identity of peer that connected
1702 GSF_peer_disconnect_handler_ (void *cls,
1703 const struct GNUNET_PeerIdentity *peer)
1705 struct GSF_ConnectedPeer *cp;
1706 struct GSF_PeerTransmitHandle *pth;
1707 struct GSF_DelayedHandle *dh;
1709 cp = GSF_peer_get_ (peer);
1711 return; /* must have been disconnect from core with
1712 * 'peer' == my_id, ignore */
1713 flush_respect (NULL, peer, cp);
1714 GNUNET_assert (GNUNET_YES ==
1715 GNUNET_CONTAINER_multipeermap_remove (cp_map,
1718 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
1719 GNUNET_CONTAINER_multipeermap_size (cp_map),
1721 if (NULL != cp->respect_iterate_req)
1723 GNUNET_PEERSTORE_iterate_cancel (cp->respect_iterate_req);
1724 cp->respect_iterate_req = NULL;
1726 if (NULL != cp->migration_pth)
1728 GSF_peer_transmit_cancel_ (cp->migration_pth);
1729 cp->migration_pth = NULL;
1733 GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
1736 if (NULL != cp->rc_delay_task)
1738 GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
1739 cp->rc_delay_task = NULL;
1741 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1742 &cancel_pending_request,
1744 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1745 cp->request_map = NULL;
1746 GSF_plan_notify_peer_disconnect_ (cp);
1747 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1748 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies,
1749 P2P_SUCCESS_LIST_SIZE);
1750 memset (cp->ppd.last_p2p_replies,
1752 sizeof (cp->ppd.last_p2p_replies));
1753 GSF_push_stop_ (cp);
1754 if (NULL != cp->cth)
1756 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1759 GNUNET_assert (0 == cp->cth_in_progress);
1760 while (NULL != (pth = cp->pth_head))
1762 if (pth->timeout_task != NULL)
1764 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1765 pth->timeout_task = NULL;
1767 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1770 if (GNUNET_YES == pth->is_query)
1771 GNUNET_assert (0 < cp->ppd.pending_queries--);
1772 else if (GNUNET_NO == pth->is_query)
1773 GNUNET_assert (0 < cp->ppd.pending_replies--);
1774 pth->gmc (pth->gmc_cls, 0, NULL);
1777 while (NULL != (dh = cp->delayed_head))
1779 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
1782 cp->delay_queue_size--;
1783 GNUNET_SCHEDULER_cancel (dh->delay_task);
1784 GNUNET_free (dh->pm);
1787 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1788 if (NULL != cp->mig_revive_task)
1790 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1791 cp->mig_revive_task = NULL;
1793 GNUNET_break (0 == cp->ppd.pending_queries);
1794 GNUNET_break (0 == cp->ppd.pending_replies);
1800 * Closure for #call_iterator().
1802 struct IterationContext
1805 * Function to call on each entry.
1807 GSF_ConnectedPeerIterator it;
1810 * Closure for @e it.
1817 * Function that calls the callback for each peer.
1819 * @param cls the `struct IterationContext *`
1820 * @param key identity of the peer
1821 * @param value the `struct GSF_ConnectedPeer *`
1822 * @return #GNUNET_YES to continue iteration
1825 call_iterator (void *cls,
1826 const struct GNUNET_PeerIdentity *key,
1829 struct IterationContext *ic = cls;
1830 struct GSF_ConnectedPeer *cp = value;
1840 * Iterate over all connected peers.
1842 * @param it function to call for each peer
1843 * @param it_cls closure for @a it
1846 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it,
1849 struct IterationContext ic;
1853 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1860 * Obtain the identity of a connected peer.
1862 * @param cp peer to get identity of
1863 * @param id identity to set (written to)
1866 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1867 struct GNUNET_PeerIdentity *id)
1869 GNUNET_assert (0 != cp->ppd.pid);
1870 GNUNET_PEER_resolve (cp->ppd.pid, id);
1875 * Obtain the identity of a connected peer.
1877 * @param cp peer to get identity of
1878 * @return reference to peer identity, valid until peer disconnects (!)
1880 const struct GNUNET_PeerIdentity *
1881 GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp)
1883 GNUNET_assert (0 != cp->ppd.pid);
1884 return GNUNET_PEER_resolve2 (cp->ppd.pid);
1889 * Assemble a migration stop message for transmission.
1891 * @param cls the `struct GSF_ConnectedPeer` to use
1892 * @param size number of bytes we're allowed to write to @a buf
1893 * @param buf where to copy the message
1894 * @return number of bytes copied to @a buf
1897 create_migration_stop_message (void *cls,
1901 struct GSF_ConnectedPeer *cp = cls;
1902 struct MigrationStopMessage msm;
1904 cp->migration_pth = NULL;
1907 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1908 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1909 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1910 msm.reserved = htonl (0);
1912 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1913 (cp->last_migration_block));
1914 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1915 GNUNET_STATISTICS_update (GSF_stats,
1916 gettext_noop ("# migration stop messages sent"),
1918 return sizeof (struct MigrationStopMessage);
1923 * Ask a peer to stop migrating data to us until the given point
1926 * @param cp peer to ask
1927 * @param block_time until when to block
1930 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1931 struct GNUNET_TIME_Absolute block_time)
1933 if (cp->last_migration_block.abs_value_us > block_time.abs_value_us)
1935 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1936 "Migration already blocked for another %s\n",
1937 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining
1938 (cp->last_migration_block), GNUNET_YES));
1939 return; /* already blocked */
1941 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %s\n",
1942 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (block_time),
1944 cp->last_migration_block = block_time;
1945 if (NULL != cp->migration_pth)
1946 GSF_peer_transmit_cancel_ (cp->migration_pth);
1948 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1949 GNUNET_TIME_UNIT_FOREVER_REL,
1950 sizeof (struct MigrationStopMessage),
1951 &create_migration_stop_message, cp);
1956 * Notify core about a preference we have for the given peer
1957 * (to allocate more resources towards it). The change will
1958 * be communicated the next time we reserve bandwidth with
1959 * core (not instantly).
1961 * @param cp peer to reserve bandwidth from
1962 * @param pref preference change
1965 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1968 cp->inc_preference += pref;
1973 * Call this method periodically to flush respect information to disk.
1975 * @param cls closure, not used
1978 cron_flush_respect (void *cls)
1980 const struct GNUNET_SCHEDULER_TaskContext *tc;
1984 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1985 &flush_respect, NULL);
1986 tc = GNUNET_SCHEDULER_get_task_context ();
1987 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1989 GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
1990 GNUNET_SCHEDULER_PRIORITY_HIGH,
1991 &cron_flush_respect, NULL);
1996 * Initialize peer management subsystem.
1999 GSF_connected_peer_init_ ()
2001 cp_map = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
2002 peerstore = GNUNET_PEERSTORE_connect (GSF_cfg);
2003 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
2004 &cron_flush_respect, NULL);
2009 * Iterator to free peer entries.
2011 * @param cls closure, unused
2012 * @param key current key code
2013 * @param value value in the hash map (peer entry)
2014 * @return #GNUNET_YES (we should continue to iterate)
2017 clean_peer (void *cls,
2018 const struct GNUNET_PeerIdentity *key,
2021 GSF_peer_disconnect_handler_ (NULL, key);
2027 * Shutdown peer management subsystem.
2030 GSF_connected_peer_done_ ()
2032 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
2035 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
2037 GNUNET_CONTAINER_multipeermap_destroy (cp_map);
2039 GNUNET_PEERSTORE_disconnect (peerstore, GNUNET_YES);
2044 * Iterator to remove references to LC entry.
2046 * @param cls the `struct GSF_LocalClient *` to look for
2047 * @param key current key code
2048 * @param value value in the hash map (peer entry)
2049 * @return #GNUNET_YES (we should continue to iterate)
2052 clean_local_client (void *cls,
2053 const struct GNUNET_PeerIdentity *key,
2056 const struct GSF_LocalClient *lc = cls;
2057 struct GSF_ConnectedPeer *cp = value;
2060 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
2061 if (cp->ppd.last_client_replies[i] == lc)
2062 cp->ppd.last_client_replies[i] = NULL;
2068 * Notification that a local client disconnected. Clean up all of our
2069 * references to the given handle.
2071 * @param lc handle to the local client (henceforth invalid)
2074 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
2077 return; /* already cleaned up */
2078 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_local_client,
2083 /* end of gnunet-service-fs_cp.c */