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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 if ((NULL != record) && (sizeof (cp->disk_respect) == record->value_size))
618 cp->disk_respect = cp->ppd.respect = *((uint32_t *)record->value);
619 GSF_push_start_ (cp);
620 if (NULL != cp->creation_cb)
621 cp->creation_cb (cp->creation_cb_cls, cp);
624 GNUNET_PEERSTORE_iterate_cancel (cp->respect_iterate_req);
625 cp->respect_iterate_req = NULL;
631 * A peer connected to us. Setup the connected peer
634 * @param peer identity of peer that connected
635 * @param creation_cb callback function when the record is created.
636 * @param creation_cb_cls closure for @creation_cb
639 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
640 GSF_ConnectedPeerCreationCallback creation_cb,
641 void *creation_cb_cls)
643 struct GSF_ConnectedPeer *cp;
645 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
646 "Connected to peer %s\n",
648 cp = GNUNET_new (struct GSF_ConnectedPeer);
649 cp->ppd.pid = GNUNET_PEER_intern (peer);
650 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
652 GNUNET_ATS_reserve_bandwidth (GSF_ats,
655 &ats_reserve_callback, cp);
656 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128,
658 GNUNET_break (GNUNET_OK ==
659 GNUNET_CONTAINER_multipeermap_put (cp_map,
660 GSF_connected_peer_get_identity2_ (cp),
662 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
663 GNUNET_STATISTICS_set (GSF_stats,
664 gettext_noop ("# peers connected"),
665 GNUNET_CONTAINER_multipeermap_size (cp_map),
667 cp->creation_cb = creation_cb;
668 cp->creation_cb_cls = creation_cb_cls;
669 cp->respect_iterate_req =
670 GNUNET_PEERSTORE_iterate (peerstore, "fs",
672 GNUNET_TIME_UNIT_FOREVER_REL,
679 * It may be time to re-start migrating content to this
680 * peer. Check, and if so, restart migration.
682 * @param cls the `struct GSF_ConnectedPeer`
685 revive_migration (void *cls)
687 struct GSF_ConnectedPeer *cp = cls;
688 struct GNUNET_TIME_Relative bt;
690 cp->mig_revive_task = NULL;
691 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
692 if (0 != bt.rel_value_us)
694 /* still time left... */
695 cp->mig_revive_task =
696 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
699 GSF_push_start_ (cp);
704 * Get a handle for a connected peer.
706 * @param peer peer's identity
707 * @return NULL if the peer is not currently connected
709 struct GSF_ConnectedPeer *
710 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
714 return GNUNET_CONTAINER_multipeermap_get (cp_map, peer);
719 * Handle P2P "MIGRATION_STOP" message.
721 * @param cls closure, always NULL
722 * @param other the other peer involved (sender or receiver, NULL
723 * for loopback messages where we are both sender and receiver)
724 * @param message the actual message
725 * @return #GNUNET_OK to keep the connection open,
726 * #GNUNET_SYSERR to close it (signal serious error)
729 GSF_handle_p2p_migration_stop_ (void *cls,
730 const struct GNUNET_PeerIdentity *other,
731 const struct GNUNET_MessageHeader *message)
733 struct GSF_ConnectedPeer *cp;
734 const struct MigrationStopMessage *msm;
735 struct GNUNET_TIME_Relative bt;
737 msm = (const struct MigrationStopMessage *) message;
738 cp = GSF_peer_get_ (other);
744 GNUNET_STATISTICS_update (GSF_stats,
745 gettext_noop ("# migration stop messages received"),
747 bt = GNUNET_TIME_relative_ntoh (msm->duration);
748 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
749 _("Migration of content to peer `%s' blocked for %s\n"),
751 GNUNET_STRINGS_relative_time_to_string (bt, GNUNET_YES));
752 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
753 if ( (NULL == cp->mig_revive_task) &&
754 (NULL == cp->respect_iterate_req) )
757 cp->mig_revive_task =
758 GNUNET_SCHEDULER_add_delayed (bt,
759 &revive_migration, cp);
766 * Copy reply and free put message.
768 * @param cls the `struct PutMessage`
769 * @param buf_size number of bytes available in @a buf
770 * @param buf where to copy the message, NULL on error (peer disconnect)
771 * @return number of bytes copied to @a buf, can be 0 (without indicating an error)
774 copy_reply (void *cls,
778 struct PutMessage *pm = cls;
783 GNUNET_assert (buf_size >= ntohs (pm->header.size));
784 size = ntohs (pm->header.size);
785 memcpy (buf, pm, size);
786 GNUNET_STATISTICS_update (GSF_stats,
787 gettext_noop ("# replies transmitted to other peers"),
794 GNUNET_STATISTICS_update (GSF_stats,
795 gettext_noop ("# replies dropped"),
805 * Free resources associated with the given peer request.
807 * @param peerreq request to free
810 free_pending_request (struct PeerRequest *peerreq)
812 struct GSF_ConnectedPeer *cp = peerreq->cp;
813 struct GSF_PendingRequestData *prd;
815 prd = GSF_pending_request_get_data_ (peerreq->pr);
816 if (NULL != peerreq->kill_task)
818 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
819 peerreq->kill_task = NULL;
821 GNUNET_STATISTICS_update (GSF_stats,
822 gettext_noop ("# P2P searches active"),
825 GNUNET_break (GNUNET_YES ==
826 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
829 GNUNET_free (peerreq);
834 * Cancel all requests associated with the peer.
837 * @param query hash code of the request
838 * @param value the `struct GSF_PendingRequest`
839 * @return #GNUNET_YES (continue to iterate)
842 cancel_pending_request (void *cls,
843 const struct GNUNET_HashCode *query,
846 struct PeerRequest *peerreq = value;
847 struct GSF_PendingRequest *pr = peerreq->pr;
849 free_pending_request (peerreq);
850 GSF_pending_request_cancel_ (pr,
857 * Free the given request.
859 * @param cls the request to free
862 peer_request_destroy (void *cls)
864 struct PeerRequest *peerreq = cls;
865 struct GSF_PendingRequest *pr = peerreq->pr;
866 struct GSF_PendingRequestData *prd;
868 peerreq->kill_task = NULL;
869 prd = GSF_pending_request_get_data_ (pr);
870 cancel_pending_request (NULL,
877 * The artificial delay is over, transmit the message now.
879 * @param cls the `struct GSF_DelayedHandle` with the message
882 transmit_delayed_now (void *cls)
884 struct GSF_DelayedHandle *dh = cls;
885 struct GSF_ConnectedPeer *cp = dh->cp;
887 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
890 cp->delay_queue_size--;
891 (void) GSF_peer_transmit_ (cp,
903 * Get the randomized delay a response should be subjected to.
905 * @return desired delay
907 static struct GNUNET_TIME_Relative
908 get_randomized_delay ()
910 struct GNUNET_TIME_Relative ret;
913 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
914 GNUNET_CRYPTO_random_u32
915 (GNUNET_CRYPTO_QUALITY_WEAK,
916 2 * GSF_avg_latency.rel_value_us + 1));
917 #if INSANE_STATISTICS
918 GNUNET_STATISTICS_update (GSF_stats,
920 ("# artificial delays introduced (ms)"),
921 ret.rel_value_us / 1000LL, GNUNET_NO);
928 * Handle a reply to a pending request. Also called if a request
929 * expires (then with data == NULL). The handler may be called
930 * many times (depending on the request type), but will not be
931 * called during or after a call to GSF_pending_request_cancel
932 * and will also not be called anymore after a call signalling
935 * @param cls `struct PeerRequest` this is an answer for
936 * @param eval evaluation of the result
937 * @param pr handle to the original pending request
938 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
939 * @param expiration when does @a data expire?
940 * @param last_transmission when did we last transmit a request for this block
941 * @param type type of the block
942 * @param data response data, NULL on request expiration
943 * @param data_len number of bytes in @a data
946 handle_p2p_reply (void *cls,
947 enum GNUNET_BLOCK_EvaluationResult eval,
948 struct GSF_PendingRequest *pr,
949 uint32_t reply_anonymity_level,
950 struct GNUNET_TIME_Absolute expiration,
951 struct GNUNET_TIME_Absolute last_transmission,
952 enum GNUNET_BLOCK_Type type,
956 struct PeerRequest *peerreq = cls;
957 struct GSF_ConnectedPeer *cp = peerreq->cp;
958 struct GSF_PendingRequestData *prd;
959 struct PutMessage *pm;
962 GNUNET_assert (data_len + sizeof (struct PutMessage) <
963 GNUNET_SERVER_MAX_MESSAGE_SIZE);
964 GNUNET_assert (peerreq->pr == pr);
965 prd = GSF_pending_request_get_data_ (pr);
968 free_pending_request (peerreq);
971 GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
972 if ((prd->type != type) && (GNUNET_BLOCK_TYPE_ANY != prd->type))
974 GNUNET_STATISTICS_update (GSF_stats,
976 ("# replies dropped due to type mismatch"),
980 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
981 "Transmitting result for query `%s' to peer\n",
982 GNUNET_h2s (&prd->query));
983 GNUNET_STATISTICS_update (GSF_stats,
984 gettext_noop ("# replies received for other peers"),
986 msize = sizeof (struct PutMessage) + data_len;
987 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
992 if ((UINT32_MAX != reply_anonymity_level) && (reply_anonymity_level > 1))
994 if (reply_anonymity_level - 1 > GSF_cover_content_count)
996 GNUNET_STATISTICS_update (GSF_stats,
998 ("# replies dropped due to insufficient cover traffic"),
1002 GSF_cover_content_count -= (reply_anonymity_level - 1);
1005 pm = GNUNET_malloc (msize);
1006 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
1007 pm->header.size = htons (msize);
1008 pm->type = htonl (type);
1009 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
1010 memcpy (&pm[1], data, data_len);
1011 if ( (UINT32_MAX != reply_anonymity_level) &&
1012 (0 != reply_anonymity_level) &&
1013 (GNUNET_YES == GSF_enable_randomized_delays) )
1015 struct GSF_DelayedHandle *dh;
1017 dh = GNUNET_new (struct GSF_DelayedHandle);
1021 GNUNET_CONTAINER_DLL_insert (cp->delayed_head,
1024 cp->delay_queue_size++;
1026 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
1027 &transmit_delayed_now,
1032 (void) GSF_peer_transmit_ (cp,
1040 if (GNUNET_BLOCK_EVALUATION_OK_LAST != eval)
1042 if (NULL == peerreq->kill_task)
1044 GNUNET_STATISTICS_update (GSF_stats,
1046 ("# P2P searches destroyed due to ultimate reply"),
1049 peerreq->kill_task =
1050 GNUNET_SCHEDULER_add_now (&peer_request_destroy,
1057 * Increase the peer's respect by a value.
1059 * @param cp which peer to change the respect value on
1060 * @param value is the int value by which the
1061 * peer's credit is to be increased or decreased
1062 * @returns the actual change in respect (positive or negative)
1065 change_peer_respect (struct GSF_ConnectedPeer *cp, int value)
1069 GNUNET_assert (NULL != cp);
1072 if (cp->ppd.respect + value < cp->ppd.respect)
1074 value = UINT32_MAX - cp->ppd.respect;
1075 cp->ppd.respect = UINT32_MAX;
1078 cp->ppd.respect += value;
1082 if (cp->ppd.respect < -value)
1084 value = -cp->ppd.respect;
1085 cp->ppd.respect = 0;
1088 cp->ppd.respect += value;
1095 * We've received a request with the specified priority. Bound it
1096 * according to how much we respect the given peer.
1098 * @param prio_in requested priority
1099 * @param cp the peer making the request
1100 * @return effective priority
1103 bound_priority (uint32_t prio_in,
1104 struct GSF_ConnectedPeer *cp)
1106 #define N ((double)128.0)
1111 ld = GSF_test_get_load_too_high_ (0);
1112 if (GNUNET_SYSERR == ld)
1114 #if INSANE_STATISTICS
1115 GNUNET_STATISTICS_update (GSF_stats,
1117 ("# requests done for free (low load)"), 1,
1120 return 0; /* excess resources */
1122 if (prio_in > INT32_MAX)
1123 prio_in = INT32_MAX;
1124 ret = -change_peer_respect (cp, -(int) prio_in);
1127 if (ret > GSF_current_priorities + N)
1128 rret = GSF_current_priorities + N;
1131 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1133 if ((GNUNET_YES == ld) && (ret > 0))
1135 /* try with charging */
1136 ld = GSF_test_get_load_too_high_ (ret);
1138 if (GNUNET_YES == ld)
1140 GNUNET_STATISTICS_update (GSF_stats,
1142 ("# request dropped, priority insufficient"), 1,
1145 change_peer_respect (cp, (int) ret);
1146 return -1; /* not enough resources */
1150 GNUNET_STATISTICS_update (GSF_stats,
1152 ("# requests done for a price (normal load)"), 1,
1161 * The priority level imposes a bound on the maximum
1162 * value for the ttl that can be requested.
1164 * @param ttl_in requested ttl
1165 * @param prio given priority
1166 * @return @a ttl_in if @a ttl_in is below the limit,
1167 * otherwise the ttl-limit for the given @a prio
1170 bound_ttl (int32_t ttl_in,
1173 unsigned long long allowed;
1177 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1178 if (ttl_in > allowed)
1180 if (allowed >= (1 << 30))
1189 * Closure for #test_exist_cb().
1191 struct TestExistClosure
1195 * Priority of the incoming request.
1200 * Relative TTL of the incoming request.
1205 * Type of the incoming request.
1207 enum GNUNET_BLOCK_Type type;
1210 * Set to #GNUNET_YES if we are done handling the query.
1218 * Test if the query already exists. If so, merge it, otherwise
1219 * keep `finished` at #GNUNET_NO.
1221 * @param cls our `struct TestExistClosure`
1222 * @param hc the key of the query
1223 * @param value the existing `struct PeerRequest`.
1224 * @return #GNUNET_YES to continue to iterate,
1225 * #GNUNET_NO if we successfully merged
1228 test_exist_cb (void *cls,
1229 const struct GNUNET_HashCode *hc,
1232 struct TestExistClosure *tec = cls;
1233 struct PeerRequest *peerreq = value;
1234 struct GSF_PendingRequest *pr;
1235 struct GSF_PendingRequestData *prd;
1238 prd = GSF_pending_request_get_data_ (pr);
1239 if (prd->type != tec->type)
1241 if (prd->ttl.abs_value_us >=
1242 GNUNET_TIME_absolute_get ().abs_value_us + tec->ttl * 1000LL)
1244 /* existing request has higher TTL, drop new one! */
1245 prd->priority += tec->priority;
1246 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1247 "Have existing request with higher TTL, dropping new request.\n");
1248 GNUNET_STATISTICS_update (GSF_stats,
1250 ("# requests dropped due to higher-TTL request"),
1252 tec->finished = GNUNET_YES;
1255 /* existing request has lower TTL, drop old one! */
1256 tec->priority += prd->priority;
1257 free_pending_request (peerreq);
1258 GSF_pending_request_cancel_ (pr,
1265 * Handle P2P "QUERY" message. Creates the pending request entry
1266 * and sets up all of the data structures to that we will
1267 * process replies properly. Does not initiate forwarding or
1268 * local database lookups.
1270 * @param other the other peer involved (sender or receiver, NULL
1271 * for loopback messages where we are both sender and receiver)
1272 * @param message the actual message
1273 * @return pending request handle, NULL on error
1275 struct GSF_PendingRequest *
1276 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1277 const struct GNUNET_MessageHeader *message)
1279 struct PeerRequest *peerreq;
1280 struct GSF_PendingRequest *pr;
1281 struct GSF_ConnectedPeer *cp;
1282 struct GSF_ConnectedPeer *cps;
1283 const struct GNUNET_PeerIdentity *target;
1284 enum GSF_PendingRequestOptions options;
1286 const struct GetMessage *gm;
1288 const struct GNUNET_PeerIdentity *opt;
1291 uint32_t ttl_decrement;
1292 struct TestExistClosure tec;
1293 GNUNET_PEER_Id spid;
1294 const struct GSF_PendingRequestData *prd;
1296 msize = ntohs (message->size);
1297 if (msize < sizeof (struct GetMessage))
1299 GNUNET_break_op (0);
1302 GNUNET_STATISTICS_update (GSF_stats,
1304 ("# GET requests received (from other peers)"),
1307 gm = (const struct GetMessage *) message;
1308 tec.type = ntohl (gm->type);
1309 bm = ntohl (gm->hash_bitmap);
1317 if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_PeerIdentity))
1319 GNUNET_break_op (0);
1322 opt = (const struct GNUNET_PeerIdentity *) &gm[1];
1323 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_PeerIdentity);
1324 /* bfsize must be power of 2, check! */
1325 if (0 != ((bfsize - 1) & bfsize))
1327 GNUNET_break_op (0);
1330 GSF_cover_query_count++;
1331 bm = ntohl (gm->hash_bitmap);
1333 cps = GSF_peer_get_ (other);
1336 /* peer must have just disconnected */
1337 GNUNET_STATISTICS_update (GSF_stats,
1339 ("# requests dropped due to initiator not being connected"),
1343 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1344 cp = GSF_peer_get_ (&opt[bits++]);
1349 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1350 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1351 "Failed to find RETURN-TO peer `%s' in connection set. Dropping query.\n",
1352 GNUNET_i2s (&opt[bits - 1]));
1355 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1356 "Failed to find peer `%s' in connection set. Dropping query.\n",
1357 GNUNET_i2s (other));
1358 GNUNET_STATISTICS_update (GSF_stats,
1360 ("# requests dropped due to missing reverse route"),
1365 if (cp->ppd.pending_replies + cp->delay_queue_size > MAX_QUEUE_PER_PEER)
1367 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1368 "Peer `%s' has too many replies queued already. Dropping query.\n",
1369 GNUNET_i2s (other));
1370 GNUNET_STATISTICS_update (GSF_stats,
1371 gettext_noop ("# requests dropped due to full reply queue"),
1376 /* note that we can really only check load here since otherwise
1377 * peers could find out that we are overloaded by not being
1378 * disconnected after sending us a malformed query... */
1379 tec.priority = bound_priority (ntohl (gm->priority),
1381 if (tec.priority < 0)
1383 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1384 "Dropping query from `%s', this peer is too busy.\n",
1385 GNUNET_i2s (other));
1388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1389 "Received request for `%s' of type %u from peer `%s' with flags %u\n",
1390 GNUNET_h2s (&gm->query),
1391 (unsigned int) tec.type,
1396 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? (&opt[bits++]) : NULL;
1397 options = GSF_PRO_DEFAULTS;
1399 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + tec.priority))
1400 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1401 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value_us * 2 +
1402 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1404 /* don't have BW to send to peer, or would likely take longer than we have for it,
1405 * so at best indirect the query */
1407 options |= GSF_PRO_FORWARD_ONLY;
1408 spid = GNUNET_PEER_intern (other);
1409 GNUNET_assert (0 != spid);
1411 tec.ttl = bound_ttl (ntohl (gm->ttl),
1413 /* decrement ttl (always) */
1415 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1417 if ((tec.ttl < 0) && (((int32_t) (tec.ttl - ttl_decrement)) > 0))
1419 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1420 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1424 GNUNET_STATISTICS_update (GSF_stats,
1426 ("# requests dropped due TTL underflow"), 1,
1428 /* integer underflow => drop (should be very rare)! */
1431 tec.ttl -= ttl_decrement;
1433 /* test if the request already exists */
1434 tec.finished = GNUNET_NO;
1435 GNUNET_CONTAINER_multihashmap_get_multiple (cp->request_map,
1439 if (GNUNET_YES == tec.finished)
1440 return NULL; /* merged into existing request, we're done */
1442 peerreq = GNUNET_new (struct PeerRequest);
1444 pr = GSF_pending_request_create_ (options,
1449 ? (const char *) &opt[bits]
1452 ntohl (gm->filter_mutator),
1454 (uint32_t) tec.priority,
1457 GNUNET_PEER_intern (other),
1458 NULL, 0, /* replies_seen */
1461 GNUNET_assert (NULL != pr);
1462 prd = GSF_pending_request_get_data_ (pr);
1464 GNUNET_break (GNUNET_OK ==
1465 GNUNET_CONTAINER_multihashmap_put (cp->request_map,
1468 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1469 GNUNET_STATISTICS_update (GSF_stats,
1470 gettext_noop ("# P2P query messages received and processed"),
1473 GNUNET_STATISTICS_update (GSF_stats,
1474 gettext_noop ("# P2P searches active"),
1482 * Function called if there has been a timeout trying to satisfy
1483 * a transmission request.
1485 * @param cls the `struct GSF_PeerTransmitHandle` of the request
1488 peer_transmit_timeout (void *cls)
1490 struct GSF_PeerTransmitHandle *pth = cls;
1491 struct GSF_ConnectedPeer *cp;
1493 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1494 "Timeout trying to transmit to other peer\n");
1495 pth->timeout_task = NULL;
1497 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1500 if (GNUNET_YES == pth->is_query)
1501 GNUNET_assert (0 < cp->ppd.pending_queries--);
1502 else if (GNUNET_NO == pth->is_query)
1503 GNUNET_assert (0 < cp->ppd.pending_replies--);
1504 GNUNET_LOAD_update (cp->ppd.transmission_delay,
1506 if (NULL != cp->cth)
1508 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1511 pth->gmc (pth->gmc_cls, 0, NULL);
1512 GNUNET_assert (0 == cp->cth_in_progress);
1518 * Transmit a message to the given peer as soon as possible.
1519 * If the peer disconnects before the transmission can happen,
1520 * the callback is invoked with a `NULL` @a buffer.
1522 * @param cp target peer
1523 * @param is_query is this a query (#GNUNET_YES) or content (#GNUNET_NO) or neither (#GNUNET_SYSERR)
1524 * @param priority how important is this request?
1525 * @param timeout when does this request timeout (call gmc with error)
1526 * @param size number of bytes we would like to send to the peer
1527 * @param gmc function to call to get the message
1528 * @param gmc_cls closure for @a gmc
1529 * @return handle to cancel request
1531 struct GSF_PeerTransmitHandle *
1532 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
1535 struct GNUNET_TIME_Relative timeout,
1537 GSF_GetMessageCallback gmc, void *gmc_cls)
1539 struct GSF_PeerTransmitHandle *pth;
1540 struct GSF_PeerTransmitHandle *pos;
1541 struct GSF_PeerTransmitHandle *prev;
1543 pth = GNUNET_new (struct GSF_PeerTransmitHandle);
1544 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1545 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1547 pth->gmc_cls = gmc_cls;
1549 pth->is_query = is_query;
1550 pth->priority = priority;
1552 /* insertion sort (by priority, descending) */
1555 while ((NULL != pos) && (pos->priority > priority))
1560 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head,
1564 if (GNUNET_YES == is_query)
1565 cp->ppd.pending_queries++;
1566 else if (GNUNET_NO == is_query)
1567 cp->ppd.pending_replies++;
1569 = GNUNET_SCHEDULER_add_delayed (timeout,
1570 &peer_transmit_timeout,
1572 schedule_transmission (pth);
1578 * Cancel an earlier request for transmission.
1580 * @param pth request to cancel
1583 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1585 struct GSF_ConnectedPeer *cp;
1587 if (NULL != pth->timeout_task)
1589 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1590 pth->timeout_task = NULL;
1593 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1596 if (GNUNET_YES == pth->is_query)
1597 GNUNET_assert (0 < cp->ppd.pending_queries--);
1598 else if (GNUNET_NO == pth->is_query)
1599 GNUNET_assert (0 < cp->ppd.pending_replies--);
1605 * Report on receiving a reply; update the performance record of the given peer.
1607 * @param cp responding peer (will be updated)
1608 * @param request_time time at which the original query was transmitted
1609 * @param request_priority priority of the original request
1612 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1613 struct GNUNET_TIME_Absolute request_time,
1614 uint32_t request_priority)
1616 struct GNUNET_TIME_Relative delay;
1618 delay = GNUNET_TIME_absolute_get_duration (request_time);
1619 cp->ppd.avg_reply_delay.rel_value_us =
1620 (cp->ppd.avg_reply_delay.rel_value_us * (RUNAVG_DELAY_N - 1) +
1621 delay.rel_value_us) / RUNAVG_DELAY_N;
1622 cp->ppd.avg_priority =
1623 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1624 request_priority) / RUNAVG_DELAY_N;
1629 * Report on receiving a reply in response to an initiating client.
1630 * Remember that this peer is good for this client.
1632 * @param cp responding peer (will be updated)
1633 * @param initiator_client local client on responsible for query
1636 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1637 struct GSF_LocalClient *initiator_client)
1639 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1640 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1645 * Report on receiving a reply in response to an initiating peer.
1646 * Remember that this peer is good for this initiating peer.
1648 * @param cp responding peer (will be updated)
1649 * @param initiator_peer other peer responsible for query
1652 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1653 const struct GSF_ConnectedPeer *initiator_peer)
1657 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1658 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1659 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1660 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1661 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1666 * Write peer-respect information to a file - flush the buffer entry!
1669 * @param key peer identity
1670 * @param value the `struct GSF_ConnectedPeer` to flush
1671 * @return #GNUNET_OK to continue iteration
1674 flush_respect (void *cls,
1675 const struct GNUNET_PeerIdentity *key,
1678 struct GSF_ConnectedPeer *cp = value;
1679 struct GNUNET_PeerIdentity pid;
1681 if (cp->ppd.respect == cp->disk_respect)
1682 return GNUNET_OK; /* unchanged */
1683 GNUNET_assert (0 != cp->ppd.pid);
1684 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1685 GNUNET_PEERSTORE_store (peerstore, "fs", &pid, "respect", &cp->ppd.respect,
1686 sizeof (cp->ppd.respect),
1687 GNUNET_TIME_UNIT_FOREVER_ABS,
1688 GNUNET_PEERSTORE_STOREOPTION_REPLACE, NULL, NULL);
1694 * A peer disconnected from us. Tear down the connected peer
1698 * @param peer identity of peer that connected
1701 GSF_peer_disconnect_handler_ (void *cls,
1702 const struct GNUNET_PeerIdentity *peer)
1704 struct GSF_ConnectedPeer *cp;
1705 struct GSF_PeerTransmitHandle *pth;
1706 struct GSF_DelayedHandle *dh;
1708 cp = GSF_peer_get_ (peer);
1710 return; /* must have been disconnect from core with
1711 * 'peer' == my_id, ignore */
1712 flush_respect (NULL, peer, cp);
1713 GNUNET_assert (GNUNET_YES ==
1714 GNUNET_CONTAINER_multipeermap_remove (cp_map,
1717 GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
1718 GNUNET_CONTAINER_multipeermap_size (cp_map),
1720 if (NULL != cp->respect_iterate_req)
1722 GNUNET_PEERSTORE_iterate_cancel (cp->respect_iterate_req);
1723 cp->respect_iterate_req = NULL;
1725 if (NULL != cp->migration_pth)
1727 GSF_peer_transmit_cancel_ (cp->migration_pth);
1728 cp->migration_pth = NULL;
1732 GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
1735 if (NULL != cp->rc_delay_task)
1737 GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
1738 cp->rc_delay_task = NULL;
1740 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1741 &cancel_pending_request,
1743 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1744 cp->request_map = NULL;
1745 GSF_plan_notify_peer_disconnect_ (cp);
1746 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1747 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies,
1748 P2P_SUCCESS_LIST_SIZE);
1749 memset (cp->ppd.last_p2p_replies,
1751 sizeof (cp->ppd.last_p2p_replies));
1752 GSF_push_stop_ (cp);
1753 if (NULL != cp->cth)
1755 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1758 GNUNET_assert (0 == cp->cth_in_progress);
1759 while (NULL != (pth = cp->pth_head))
1761 if (pth->timeout_task != NULL)
1763 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1764 pth->timeout_task = NULL;
1766 GNUNET_CONTAINER_DLL_remove (cp->pth_head,
1769 if (GNUNET_YES == pth->is_query)
1770 GNUNET_assert (0 < cp->ppd.pending_queries--);
1771 else if (GNUNET_NO == pth->is_query)
1772 GNUNET_assert (0 < cp->ppd.pending_replies--);
1773 pth->gmc (pth->gmc_cls, 0, NULL);
1776 while (NULL != (dh = cp->delayed_head))
1778 GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
1781 cp->delay_queue_size--;
1782 GNUNET_SCHEDULER_cancel (dh->delay_task);
1783 GNUNET_free (dh->pm);
1786 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1787 if (NULL != cp->mig_revive_task)
1789 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1790 cp->mig_revive_task = NULL;
1792 GNUNET_break (0 == cp->ppd.pending_queries);
1793 GNUNET_break (0 == cp->ppd.pending_replies);
1799 * Closure for #call_iterator().
1801 struct IterationContext
1804 * Function to call on each entry.
1806 GSF_ConnectedPeerIterator it;
1809 * Closure for @e it.
1816 * Function that calls the callback for each peer.
1818 * @param cls the `struct IterationContext *`
1819 * @param key identity of the peer
1820 * @param value the `struct GSF_ConnectedPeer *`
1821 * @return #GNUNET_YES to continue iteration
1824 call_iterator (void *cls,
1825 const struct GNUNET_PeerIdentity *key,
1828 struct IterationContext *ic = cls;
1829 struct GSF_ConnectedPeer *cp = value;
1839 * Iterate over all connected peers.
1841 * @param it function to call for each peer
1842 * @param it_cls closure for @a it
1845 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it,
1848 struct IterationContext ic;
1852 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1859 * Obtain the identity of a connected peer.
1861 * @param cp peer to get identity of
1862 * @param id identity to set (written to)
1865 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1866 struct GNUNET_PeerIdentity *id)
1868 GNUNET_assert (0 != cp->ppd.pid);
1869 GNUNET_PEER_resolve (cp->ppd.pid, id);
1874 * Obtain the identity of a connected peer.
1876 * @param cp peer to get identity of
1877 * @return reference to peer identity, valid until peer disconnects (!)
1879 const struct GNUNET_PeerIdentity *
1880 GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp)
1882 GNUNET_assert (0 != cp->ppd.pid);
1883 return GNUNET_PEER_resolve2 (cp->ppd.pid);
1888 * Assemble a migration stop message for transmission.
1890 * @param cls the `struct GSF_ConnectedPeer` to use
1891 * @param size number of bytes we're allowed to write to @a buf
1892 * @param buf where to copy the message
1893 * @return number of bytes copied to @a buf
1896 create_migration_stop_message (void *cls,
1900 struct GSF_ConnectedPeer *cp = cls;
1901 struct MigrationStopMessage msm;
1903 cp->migration_pth = NULL;
1906 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1907 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1908 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1909 msm.reserved = htonl (0);
1911 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1912 (cp->last_migration_block));
1913 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1914 GNUNET_STATISTICS_update (GSF_stats,
1915 gettext_noop ("# migration stop messages sent"),
1917 return sizeof (struct MigrationStopMessage);
1922 * Ask a peer to stop migrating data to us until the given point
1925 * @param cp peer to ask
1926 * @param block_time until when to block
1929 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1930 struct GNUNET_TIME_Absolute block_time)
1932 if (cp->last_migration_block.abs_value_us > block_time.abs_value_us)
1934 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1935 "Migration already blocked for another %s\n",
1936 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining
1937 (cp->last_migration_block), GNUNET_YES));
1938 return; /* already blocked */
1940 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %s\n",
1941 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (block_time),
1943 cp->last_migration_block = block_time;
1944 if (NULL != cp->migration_pth)
1945 GSF_peer_transmit_cancel_ (cp->migration_pth);
1947 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1948 GNUNET_TIME_UNIT_FOREVER_REL,
1949 sizeof (struct MigrationStopMessage),
1950 &create_migration_stop_message, cp);
1955 * Notify core about a preference we have for the given peer
1956 * (to allocate more resources towards it). The change will
1957 * be communicated the next time we reserve bandwidth with
1958 * core (not instantly).
1960 * @param cp peer to reserve bandwidth from
1961 * @param pref preference change
1964 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1967 cp->inc_preference += pref;
1972 * Call this method periodically to flush respect information to disk.
1974 * @param cls closure, not used
1977 cron_flush_respect (void *cls)
1980 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
1983 fr_task = GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
1984 GNUNET_SCHEDULER_PRIORITY_HIGH,
1985 &cron_flush_respect, NULL);
1990 * Initialize peer management subsystem.
1993 GSF_connected_peer_init_ ()
1995 cp_map = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
1996 peerstore = GNUNET_PEERSTORE_connect (GSF_cfg);
1997 fr_task = GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1998 &cron_flush_respect, NULL);
2003 * Iterator to free peer entries.
2005 * @param cls closure, unused
2006 * @param key current key code
2007 * @param value value in the hash map (peer entry)
2008 * @return #GNUNET_YES (we should continue to iterate)
2011 clean_peer (void *cls,
2012 const struct GNUNET_PeerIdentity *key,
2015 GSF_peer_disconnect_handler_ (NULL, key);
2021 * Shutdown peer management subsystem.
2024 GSF_connected_peer_done_ ()
2026 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
2029 GNUNET_CONTAINER_multipeermap_iterate (cp_map,
2032 GNUNET_SCHEDULER_cancel (fr_task);
2034 GNUNET_CONTAINER_multipeermap_destroy (cp_map);
2036 GNUNET_PEERSTORE_disconnect (peerstore,
2043 * Iterator to remove references to LC entry.
2045 * @param cls the `struct GSF_LocalClient *` to look for
2046 * @param key current key code
2047 * @param value value in the hash map (peer entry)
2048 * @return #GNUNET_YES (we should continue to iterate)
2051 clean_local_client (void *cls,
2052 const struct GNUNET_PeerIdentity *key,
2055 const struct GSF_LocalClient *lc = cls;
2056 struct GSF_ConnectedPeer *cp = value;
2059 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
2060 if (cp->ppd.last_client_replies[i] == lc)
2061 cp->ppd.last_client_replies[i] = NULL;
2067 * Notification that a local client disconnected. Clean up all of our
2068 * references to the given handle.
2070 * @param lc handle to the local client (henceforth invalid)
2073 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
2076 return; /* already cleaned up */
2077 GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_local_client,
2082 /* end of gnunet-service-fs_cp.c */