2 This file is part of GNUnet.
3 (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file fs/gnunet-service-fs_pr.c
23 * @brief API to handle pending requests
24 * @author Christian Grothoff
27 #include "gnunet_load_lib.h"
28 #include "gnunet-service-fs.h"
29 #include "gnunet-service-fs_cp.h"
30 #include "gnunet-service-fs_indexing.h"
31 #include "gnunet-service-fs_pe.h"
32 #include "gnunet-service-fs_pr.h"
35 * Hard limit on the number of results we may get from the datastore per query.
37 #define MAX_RESULTS (100 * 1024)
42 struct GSF_PendingRequest
45 * Public data for the request.
47 struct GSF_PendingRequestData public_data;
50 * Function to call if we encounter a reply.
52 GSF_PendingRequestReplyHandler rh;
60 * Array of hash codes of replies we've already seen.
62 GNUNET_HashCode *replies_seen;
65 * Bloomfilter masking replies we've already seen.
67 struct GNUNET_CONTAINER_BloomFilter *bf;
70 * Entry for this pending request in the expiration heap, or NULL.
72 struct GNUNET_CONTAINER_HeapNode *hnode;
75 * Datastore queue entry for this request (or NULL for none).
77 struct GNUNET_DATASTORE_QueueEntry *qe;
80 * DHT request handle for this request (or NULL for none).
82 struct GNUNET_DHT_GetHandle *gh;
85 * Function to call upon completion of the local get
86 * request, or NULL for none.
88 GSF_LocalLookupContinuation llc_cont;
91 * Closure for llc_cont.
96 * Last result from the local datastore lookup evaluation.
98 enum GNUNET_BLOCK_EvaluationResult local_result;
101 * Identity of the peer that we should use for the 'sender'
102 * (recipient of the response) when forwarding (0 for none).
104 GNUNET_PEER_Id sender_pid;
107 * Time we started the last datastore lookup.
109 struct GNUNET_TIME_Absolute qe_start;
112 * Task that warns us if the local datastore lookup takes too long.
114 GNUNET_SCHEDULER_TaskIdentifier warn_task;
117 * Current offset for querying our local datastore for results.
118 * Starts at a random value, incremented until we get the same
119 * UID again (detected using 'first_uid'), which is then used
120 * to termiante the iteration.
122 uint64_t local_result_offset;
125 * Unique ID of the first result from the local datastore;
126 * used to detect wrap-around of the offset.
131 * Number of valid entries in the 'replies_seen' array.
133 unsigned int replies_seen_count;
136 * Length of the 'replies_seen' array.
138 unsigned int replies_seen_size;
141 * Mingle value we currently use for the bf.
146 * Do we have a first UID yet?
148 unsigned int have_first_uid;
154 * All pending requests, ordered by the query. Entries
155 * are of type 'struct GSF_PendingRequest*'.
157 static struct GNUNET_CONTAINER_MultiHashMap *pr_map;
161 * Datastore 'PUT' load tracking.
163 static struct GNUNET_LOAD_Value *datastore_put_load;
167 * Are we allowed to migrate content to this peer.
169 static int active_to_migration;
173 * Heap with the request that will expire next at the top. Contains
174 * pointers of type "struct PendingRequest*"; these will *also* be
175 * aliased from the "requests_by_peer" data structures and the
176 * "requests_by_query" table. Note that requests from our clients
177 * don't expire and are thus NOT in the "requests_by_expiration"
178 * (or the "requests_by_peer" tables).
180 static struct GNUNET_CONTAINER_Heap *requests_by_expiration_heap;
184 * Maximum number of requests (from other peers, overall) that we're
185 * willing to have pending at any given point in time. Can be changed
186 * via the configuration file (32k is just the default).
188 static unsigned long long max_pending_requests = (32 * 1024);
192 * How many bytes should a bloomfilter be if we have already seen
193 * entry_count responses? Note that BLOOMFILTER_K gives us the number
194 * of bits set per entry. Furthermore, we should not re-size the
195 * filter too often (to keep it cheap).
197 * Since other peers will also add entries but not resize the filter,
198 * we should generally pick a slightly larger size than what the
199 * strict math would suggest.
201 * @return must be a power of two and smaller or equal to 2^15.
204 compute_bloomfilter_size (unsigned int entry_count)
207 unsigned int ideal = (entry_count * BLOOMFILTER_K) / 4;
208 uint16_t max = 1 << 15;
210 if (entry_count > max)
213 while ((size < max) && (size < ideal))
222 * Recalculate our bloom filter for filtering replies. This function
223 * will create a new bloom filter from scratch, so it should only be
224 * called if we have no bloomfilter at all (and hence can create a
225 * fresh one of minimal size without problems) OR if our peer is the
226 * initiator (in which case we may resize to larger than mimimum size).
228 * @param pr request for which the BF is to be recomputed
229 * @return GNUNET_YES if a refresh actually happened
232 refresh_bloomfilter (struct GSF_PendingRequest *pr)
236 GNUNET_HashCode mhash;
238 nsize = compute_bloomfilter_size (pr->replies_seen_count);
239 if ( (pr->bf != NULL) &&
240 (nsize == GNUNET_CONTAINER_bloomfilter_get_size (pr->bf)) )
241 return GNUNET_NO; /* size not changed */
243 GNUNET_CONTAINER_bloomfilter_free (pr->bf);
244 pr->mingle = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
246 pr->bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
249 for (i=0;i<pr->replies_seen_count;i++)
251 GNUNET_BLOCK_mingle_hash (&pr->replies_seen[i],
254 GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
261 * Create a new pending request.
263 * @param options request options
264 * @param type type of the block that is being requested
265 * @param query key for the lookup
266 * @param namespace namespace to lookup, NULL for no namespace
267 * @param target preferred target for the request, NULL for none
268 * @param bf_data raw data for bloom filter for known replies, can be NULL
269 * @param bf_size number of bytes in bf_data
270 * @param mingle mingle value for bf
271 * @param anonymity_level desired anonymity level
272 * @param priority maximum outgoing cummulative request priority to use
273 * @param ttl current time-to-live for the request
274 * @param sender_pid peer ID to use for the sender when forwarding, 0 for none
275 * @param replies_seen hash codes of known local replies
276 * @param replies_seen_count size of the 'replies_seen' array
277 * @param rh handle to call when we get a reply
278 * @param rh_cls closure for rh
279 * @return handle for the new pending request
281 struct GSF_PendingRequest *
282 GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
283 enum GNUNET_BLOCK_Type type,
284 const GNUNET_HashCode *query,
285 const GNUNET_HashCode *namespace,
286 const struct GNUNET_PeerIdentity *target,
290 uint32_t anonymity_level,
293 GNUNET_PEER_Id sender_pid,
294 const GNUNET_HashCode *replies_seen,
295 unsigned int replies_seen_count,
296 GSF_PendingRequestReplyHandler rh,
299 struct GSF_PendingRequest *pr;
300 struct GSF_PendingRequest *dpr;
303 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
304 "Creating request handle for `%s' of type %d\n",
308 pr = GNUNET_malloc (sizeof (struct GSF_PendingRequest));
309 pr->local_result_offset = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
311 pr->public_data.query = *query;
312 if (GNUNET_BLOCK_TYPE_FS_SBLOCK == type)
314 GNUNET_assert (NULL != namespace);
315 pr->public_data.namespace = *namespace;
319 pr->public_data.target = *target;
320 pr->public_data.has_target = GNUNET_YES;
322 pr->public_data.anonymity_level = anonymity_level;
323 pr->public_data.priority = priority;
324 pr->public_data.original_priority = priority;
325 pr->public_data.options = options;
326 pr->public_data.type = type;
327 pr->public_data.start_time = GNUNET_TIME_absolute_get ();
328 pr->sender_pid = sender_pid;
332 pr->public_data.ttl = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
335 pr->public_data.ttl = GNUNET_TIME_absolute_subtract (pr->public_data.start_time,
336 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
337 (uint32_t) (- ttl)));
338 if (replies_seen_count > 0)
340 pr->replies_seen_size = replies_seen_count;
341 pr->replies_seen = GNUNET_malloc (sizeof (GNUNET_HashCode) * pr->replies_seen_size);
342 memcpy (pr->replies_seen,
344 replies_seen_count * sizeof (GNUNET_HashCode));
345 pr->replies_seen_count = replies_seen_count;
349 pr->bf = GNUNET_CONTAINER_bloomfilter_init (bf_data,
354 else if ( (replies_seen_count > 0) &&
355 (0 != (options & GSF_PRO_BLOOMFILTER_FULL_REFRESH)) )
357 GNUNET_assert (GNUNET_YES == refresh_bloomfilter (pr));
359 GNUNET_CONTAINER_multihashmap_put (pr_map,
362 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
363 if (0 != (options & GSF_PRO_REQUEST_EXPIRES))
365 pr->hnode = GNUNET_CONTAINER_heap_insert (requests_by_expiration_heap,
367 pr->public_data.ttl.abs_value);
368 /* make sure we don't track too many requests */
369 while (GNUNET_CONTAINER_heap_get_size (requests_by_expiration_heap) > max_pending_requests)
371 dpr = GNUNET_CONTAINER_heap_peek (requests_by_expiration_heap);
372 GNUNET_assert (dpr != NULL);
374 break; /* let the request live briefly... */
375 dpr->rh (dpr->rh_cls,
376 GNUNET_BLOCK_EVALUATION_REQUEST_VALID,
379 GNUNET_TIME_UNIT_FOREVER_ABS,
380 GNUNET_BLOCK_TYPE_ANY,
382 GSF_pending_request_cancel_ (dpr);
385 GNUNET_STATISTICS_update (GSF_stats,
386 gettext_noop ("# Pending requests active"),
394 * Obtain the public data associated with a pending request
396 * @param pr pending request
397 * @return associated public data
399 struct GSF_PendingRequestData *
400 GSF_pending_request_get_data_ (struct GSF_PendingRequest *pr)
402 return &pr->public_data;
407 * Update a given pending request with additional replies
408 * that have been seen.
410 * @param pr request to update
411 * @param replies_seen hash codes of replies that we've seen
412 * @param replies_seen_count size of the replies_seen array
415 GSF_pending_request_update_ (struct GSF_PendingRequest *pr,
416 const GNUNET_HashCode *replies_seen,
417 unsigned int replies_seen_count)
420 GNUNET_HashCode mhash;
422 if (replies_seen_count + pr->replies_seen_count < pr->replies_seen_count)
423 return; /* integer overflow */
424 if (0 != (pr->public_data.options & GSF_PRO_BLOOMFILTER_FULL_REFRESH))
426 /* we're responsible for the BF, full refresh */
427 if (replies_seen_count + pr->replies_seen_count > pr->replies_seen_size)
428 GNUNET_array_grow (pr->replies_seen,
429 pr->replies_seen_size,
430 replies_seen_count + pr->replies_seen_count);
431 memcpy (&pr->replies_seen[pr->replies_seen_count],
433 sizeof (GNUNET_HashCode) * replies_seen_count);
434 pr->replies_seen_count += replies_seen_count;
435 if (GNUNET_NO == refresh_bloomfilter (pr))
437 /* bf not recalculated, simply extend it with new bits */
438 for (i=0;i<replies_seen_count;i++)
440 GNUNET_BLOCK_mingle_hash (&replies_seen[i],
443 GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
451 /* we're not the initiator, but the initiator did not give us
452 any bloom-filter, so we need to create one on-the-fly */
453 pr->mingle = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
455 pr->bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
456 compute_bloomfilter_size (replies_seen_count),
459 for (i=0;i<pr->replies_seen_count;i++)
461 GNUNET_BLOCK_mingle_hash (&replies_seen[i],
464 GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
471 * Generate the message corresponding to the given pending request for
472 * transmission to other peers (or at least determine its size).
474 * @param pr request to generate the message for
475 * @param buf_size number of bytes available in buf
476 * @param buf where to copy the message (can be NULL)
477 * @return number of bytes needed (if > buf_size) or used
480 GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
484 char lbuf[GNUNET_SERVER_MAX_MESSAGE_SIZE];
485 struct GetMessage *gm;
486 GNUNET_HashCode *ext;
492 struct GNUNET_TIME_Absolute now;
498 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
499 "Building request message for `%s' of type %d\n",
500 GNUNET_h2s (&pr->public_data.query),
501 pr->public_data.type);
505 do_route = (0 == (pr->public_data.options & GSF_PRO_FORWARD_ONLY));
506 if ( (do_route) && (pr->sender_pid == 0))
509 do_route = GNUNET_NO;
513 bm |= GET_MESSAGE_BIT_RETURN_TO;
516 if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
518 bm |= GET_MESSAGE_BIT_SKS_NAMESPACE;
521 if (GNUNET_YES == pr->public_data.has_target)
523 bm |= GET_MESSAGE_BIT_TRANSMIT_TO;
526 bf_size = GNUNET_CONTAINER_bloomfilter_get_size (pr->bf);
527 msize = sizeof (struct GetMessage) + bf_size + k * sizeof(GNUNET_HashCode);
528 GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
529 if (buf_size < msize)
531 gm = (struct GetMessage*) lbuf;
532 gm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_GET);
533 gm->header.size = htons (msize);
534 gm->type = htonl (pr->public_data.type);
536 prio = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
537 pr->public_data.priority + 1);
540 pr->public_data.priority -= prio;
541 gm->priority = htonl (prio);
542 now = GNUNET_TIME_absolute_get ();
543 ttl = (int64_t) (pr->public_data.ttl.abs_value - now.abs_value);
544 gm->ttl = htonl (ttl / 1000);
545 gm->filter_mutator = htonl(pr->mingle);
546 gm->hash_bitmap = htonl (bm);
547 gm->query = pr->public_data.query;
548 ext = (GNUNET_HashCode*) &gm[1];
551 GNUNET_PEER_resolve (pr->sender_pid,
552 (struct GNUNET_PeerIdentity*) &ext[k++]);
553 if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
555 &pr->public_data.namespace,
556 sizeof (GNUNET_HashCode));
557 if (GNUNET_YES == pr->public_data.has_target)
558 ext[k++] = pr->public_data.target.hashPubKey;
560 GNUNET_CONTAINER_bloomfilter_get_raw_data (pr->bf,
563 memcpy (buf, gm, msize);
569 * Iterator to free pending requests.
571 * @param cls closure, unused
572 * @param key current key code
573 * @param value value in the hash map (pending request)
574 * @return GNUNET_YES (we should continue to iterate)
577 clean_request (void *cls,
578 const GNUNET_HashCode * key,
581 struct GSF_PendingRequest *pr = value;
582 GSF_LocalLookupContinuation cont;
585 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
586 "Cleaning up pending request for `%s'.\n",
589 if (NULL != (cont = pr->llc_cont))
592 cont (pr->llc_cont_cls,
596 GSF_plan_notify_request_done_ (pr);
597 GNUNET_free_non_null (pr->replies_seen);
600 GNUNET_CONTAINER_bloomfilter_free (pr->bf);
603 GNUNET_PEER_change_rc (pr->sender_pid, -1);
604 if (NULL != pr->hnode)
606 GNUNET_CONTAINER_heap_remove_node (pr->hnode);
611 GNUNET_DATASTORE_cancel (pr->qe);
616 GNUNET_DHT_get_stop (pr->gh);
619 if (GNUNET_SCHEDULER_NO_TASK != pr->warn_task)
621 GNUNET_SCHEDULER_cancel (pr->warn_task);
622 pr->warn_task = GNUNET_SCHEDULER_NO_TASK;
624 GNUNET_assert (GNUNET_OK ==
625 GNUNET_CONTAINER_multihashmap_remove (pr_map,
626 &pr->public_data.query,
628 GNUNET_STATISTICS_update (GSF_stats,
629 gettext_noop ("# Pending requests active"),
638 * Explicitly cancel a pending request.
640 * @param pr request to cancel
643 GSF_pending_request_cancel_ (struct GSF_PendingRequest *pr)
646 return; /* already cleaned up! */
647 GNUNET_assert (GNUNET_YES ==
648 clean_request (NULL, &pr->public_data.query, pr));
653 * Iterate over all pending requests.
655 * @param it function to call for each request
656 * @param cls closure for it
659 GSF_iterate_pending_requests_ (GSF_PendingRequestIterator it,
662 GNUNET_CONTAINER_multihashmap_iterate (pr_map,
663 (GNUNET_CONTAINER_HashMapIterator) it,
671 * Closure for "process_reply" function.
673 struct ProcessReplyClosure
676 * The data for the reply.
681 * Who gave us this reply? NULL for local host (or DHT)
683 struct GSF_ConnectedPeer *sender;
686 * When the reply expires.
688 struct GNUNET_TIME_Absolute expiration;
698 enum GNUNET_BLOCK_Type type;
701 * How much was this reply worth to us?
706 * Anonymity requirements for this reply.
708 uint32_t anonymity_level;
711 * Evaluation result (returned).
713 enum GNUNET_BLOCK_EvaluationResult eval;
716 * Did we find a matching request?
723 * Update the performance data for the sender (if any) since
724 * the sender successfully answered one of our queries.
726 * @param prq information about the sender
727 * @param pr request that was satisfied
730 update_request_performance_data (struct ProcessReplyClosure *prq,
731 struct GSF_PendingRequest *pr)
733 if (prq->sender == NULL)
735 GSF_peer_update_performance_ (prq->sender,
736 pr->public_data.start_time,
742 * We have received a reply; handle it!
744 * @param cls response (struct ProcessReplyClosure)
745 * @param key our query
746 * @param value value in the hash map (info about the query)
747 * @return GNUNET_YES (we should continue to iterate)
750 process_reply (void *cls,
751 const GNUNET_HashCode *key,
754 struct ProcessReplyClosure *prq = cls;
755 struct GSF_PendingRequest *pr = value;
756 GNUNET_HashCode chash;
759 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
760 "Matched result (type %u) for query `%s' with pending request\n",
761 (unsigned int) prq->type,
764 GNUNET_STATISTICS_update (GSF_stats,
765 gettext_noop ("# replies received and matched"),
768 prq->eval = GNUNET_BLOCK_evaluate (GSF_block_ctx,
773 &pr->public_data.namespace,
774 (prq->type == GNUNET_BLOCK_TYPE_FS_SBLOCK) ? sizeof (GNUNET_HashCode) : 0,
779 case GNUNET_BLOCK_EVALUATION_OK_MORE:
780 update_request_performance_data (prq, pr);
782 case GNUNET_BLOCK_EVALUATION_OK_LAST:
783 /* short cut: stop processing early, no BF-update, etc. */
784 update_request_performance_data (prq, pr);
785 GNUNET_LOAD_update (GSF_rt_entry_lifetime,
786 GNUNET_TIME_absolute_get_duration (pr->public_data.start_time).rel_value);
787 /* pass on to other peers / local clients */
791 prq->anonymity_level,
794 prq->data, prq->size);
796 case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
797 GNUNET_STATISTICS_update (GSF_stats,
798 gettext_noop ("# duplicate replies discarded (bloomfilter)"),
802 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
803 "Duplicate response `%s', discarding.\n",
804 GNUNET_h2s (&mhash));
806 return GNUNET_YES; /* duplicate */
807 case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
808 return GNUNET_YES; /* wrong namespace */
809 case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
812 case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
815 case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
816 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
817 _("Unsupported block type %u\n"),
821 /* update bloomfilter */
822 GNUNET_CRYPTO_hash (prq->data,
825 GSF_pending_request_update_ (pr, &chash, 1);
826 if (NULL == prq->sender)
829 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
830 "Found result for query `%s' in local datastore\n",
833 GNUNET_STATISTICS_update (GSF_stats,
834 gettext_noop ("# results found locally"),
840 GSF_dht_lookup_ (pr);
842 prq->priority += pr->public_data.original_priority;
843 pr->public_data.priority = 0;
844 pr->public_data.original_priority = 0;
845 pr->public_data.results_found++;
846 prq->request_found = GNUNET_YES;
847 /* finally, pass on to other peer / local client */
851 prq->anonymity_level,
854 prq->data, prq->size);
860 * Context for the 'put_migration_continuation'.
862 struct PutMigrationContext
866 * Start time for the operation.
868 struct GNUNET_TIME_Absolute start;
873 struct GNUNET_PeerIdentity origin;
876 * GNUNET_YES if we had a matching request for this block,
884 * Continuation called to notify client about result of the
888 * @param success GNUNET_SYSERR on failure
889 * @param msg NULL on success, otherwise an error message
892 put_migration_continuation (void *cls,
896 struct PutMigrationContext *pmc = cls;
897 struct GNUNET_TIME_Relative delay;
898 struct GNUNET_TIME_Relative block_time;
899 struct GSF_ConnectedPeer *cp;
900 struct GSF_PeerPerformanceData *ppd;
902 delay = GNUNET_TIME_absolute_get_duration (pmc->start);
903 cp = GSF_peer_get_ (&pmc->origin);
904 if ( (GNUNET_OK != success) &&
905 (GNUNET_NO == pmc->requested) )
907 /* block migration for a bit... */
910 ppd = GSF_get_peer_performance_data_ (cp);
911 ppd->migration_duplication++;
912 block_time = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
913 5 * ppd->migration_duplication +
914 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 5));
915 GSF_block_peer_migration_ (cp, block_time);
922 ppd = GSF_get_peer_performance_data_ (cp);
923 ppd->migration_duplication = 0; /* reset counter */
927 /* FIXME: should we really update the load value on failure? */
928 GNUNET_LOAD_update (datastore_put_load,
930 if (GNUNET_OK == success)
932 GNUNET_STATISTICS_update (GSF_stats,
933 gettext_noop ("# Datastore `PUT' failures"),
940 * Test if the DATABASE (PUT) load on this peer is too high
941 * to even consider processing the query at
944 * @return GNUNET_YES if the load is too high to do anything (load high)
945 * GNUNET_NO to process normally (load normal or low)
948 test_put_load_too_high (uint32_t priority)
952 if (GNUNET_LOAD_get_average (datastore_put_load) < 50)
953 return GNUNET_NO; /* very fast */
954 ld = GNUNET_LOAD_get_load (datastore_put_load);
955 if (ld < 2.0 * (1 + priority))
957 GNUNET_STATISTICS_update (GSF_stats,
958 gettext_noop ("# storage requests dropped due to high load"),
966 * Iterator called on each result obtained for a DHT
967 * operation that expects a reply
970 * @param exp when will this value expire
971 * @param key key of the result
972 * @param get_path NULL-terminated array of pointers
973 * to the peers on reverse GET path (or NULL if not recorded)
974 * @param put_path NULL-terminated array of pointers
975 * to the peers on the PUT path (or NULL if not recorded)
976 * @param type type of the result
977 * @param size number of bytes in data
978 * @param data pointer to the result data
981 handle_dht_reply (void *cls,
982 struct GNUNET_TIME_Absolute exp,
983 const GNUNET_HashCode *key,
984 const struct GNUNET_PeerIdentity * const *get_path,
985 const struct GNUNET_PeerIdentity * const *put_path,
986 enum GNUNET_BLOCK_Type type,
990 struct GSF_PendingRequest *pr = cls;
991 struct ProcessReplyClosure prq;
992 struct PutMigrationContext *pmc;
994 GNUNET_STATISTICS_update (GSF_stats,
995 gettext_noop ("# Replies received from DHT"),
998 memset (&prq, 0, sizeof (prq));
1000 prq.expiration = exp;
1003 process_reply (&prq, key, pr);
1004 if ( (GNUNET_YES == active_to_migration) &&
1005 (GNUNET_NO == test_put_load_too_high (prq.priority)) )
1008 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1009 "Replicating result for query `%s' with priority %u\n",
1013 pmc = GNUNET_malloc (sizeof (struct PutMigrationContext));
1014 pmc->start = GNUNET_TIME_absolute_get ();
1015 pmc->requested = GNUNET_YES;
1017 GNUNET_DATASTORE_put (GSF_dsh,
1019 type, prq.priority, 1 /* anonymity */,
1020 0 /* replication */,
1022 1 + prq.priority, MAX_DATASTORE_QUEUE,
1023 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1024 &put_migration_continuation,
1027 put_migration_continuation (pmc, GNUNET_NO, NULL);
1034 * Consider looking up the data in the DHT (anonymity-level permitting).
1036 * @param pr the pending request to process
1039 GSF_dht_lookup_ (struct GSF_PendingRequest *pr)
1043 struct GNUNET_PeerIdentity pi;
1044 char buf[sizeof (GNUNET_HashCode) * 2];
1046 if (0 != pr->public_data.anonymity_level)
1050 GNUNET_DHT_get_stop (pr->gh);
1055 if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
1058 memcpy (buf, &pr->public_data.namespace, sizeof (GNUNET_HashCode));
1059 xquery_size = sizeof (GNUNET_HashCode);
1061 if (0 != (pr->public_data.options & GSF_PRO_FORWARD_ONLY))
1063 GNUNET_assert (0 != pr->sender_pid);
1064 GNUNET_PEER_resolve (pr->sender_pid,
1066 memcpy (&buf[xquery_size], &pi, sizeof (struct GNUNET_PeerIdentity));
1067 xquery_size += sizeof (struct GNUNET_PeerIdentity);
1069 pr->gh = GNUNET_DHT_get_start (GSF_dht,
1070 GNUNET_TIME_UNIT_FOREVER_REL,
1071 pr->public_data.type,
1072 &pr->public_data.query,
1073 DEFAULT_GET_REPLICATION,
1074 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
1085 * Task that issues a warning if the datastore lookup takes too long.
1087 * @param cls the 'struct GSF_PendingRequest'
1088 * @param tc task context
1091 warn_delay_task (void *cls,
1092 const struct GNUNET_SCHEDULER_TaskContext *tc)
1094 struct GSF_PendingRequest *pr = cls;
1096 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1097 _("Datastore lookup already took %llu ms!\n"),
1098 (unsigned long long) GNUNET_TIME_absolute_get_duration (pr->qe_start).rel_value);
1099 pr->warn_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
1106 * Task that issues a warning if the datastore lookup takes too long.
1108 * @param cls the 'struct GSF_PendingRequest'
1109 * @param tc task context
1112 odc_warn_delay_task (void *cls,
1113 const struct GNUNET_SCHEDULER_TaskContext *tc)
1115 struct GSF_PendingRequest *pr = cls;
1117 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1118 _("On-demand lookup already took %llu ms!\n"),
1119 (unsigned long long) GNUNET_TIME_absolute_get_duration (pr->qe_start).rel_value);
1120 pr->warn_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
1121 &odc_warn_delay_task,
1127 * We're processing (local) results for a search request
1128 * from another peer. Pass applicable results to the
1129 * peer and if we are done either clean up (operation
1130 * complete) or forward to other peers (more results possible).
1132 * @param cls our closure (struct PendingRequest)
1133 * @param key key for the content
1134 * @param size number of bytes in data
1135 * @param data content stored
1136 * @param type type of the content
1137 * @param priority priority of the content
1138 * @param anonymity anonymity-level for the content
1139 * @param expiration expiration time for the content
1140 * @param uid unique identifier for the datum;
1141 * maybe 0 if no unique identifier is available
1144 process_local_reply (void *cls,
1145 const GNUNET_HashCode *key,
1148 enum GNUNET_BLOCK_Type type,
1151 struct GNUNET_TIME_Absolute expiration,
1154 struct GSF_PendingRequest *pr = cls;
1155 GSF_LocalLookupContinuation cont;
1156 struct ProcessReplyClosure prq;
1157 GNUNET_HashCode query;
1158 unsigned int old_rf;
1160 GNUNET_SCHEDULER_cancel (pr->warn_task);
1161 pr->warn_task = GNUNET_SCHEDULER_NO_TASK;
1167 GNUNET_STATISTICS_update (GSF_stats,
1168 gettext_noop ("# Datastore lookups concluded (no results)"),
1172 if (GNUNET_NO == pr->have_first_uid)
1174 pr->first_uid = uid;
1175 pr->have_first_uid = 1;
1179 if ( (uid == pr->first_uid) && (key != NULL) )
1181 GNUNET_STATISTICS_update (GSF_stats,
1182 gettext_noop ("# Datastore lookups concluded (seen all)"),
1185 key = NULL; /* all replies seen! */
1187 pr->have_first_uid++;
1188 if ( (pr->have_first_uid > MAX_RESULTS) && (key != NULL) )
1190 GNUNET_STATISTICS_update (GSF_stats,
1191 gettext_noop ("# Datastore lookups aborted (more than MAX_RESULTS)"),
1194 key = NULL; /* all replies seen! */
1201 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1202 "No further local responses available.\n");
1204 if ( (pr->public_data.type == GNUNET_BLOCK_TYPE_FS_DBLOCK) ||
1205 (pr->public_data.type == GNUNET_BLOCK_TYPE_FS_IBLOCK) )
1206 GNUNET_STATISTICS_update (GSF_stats,
1207 gettext_noop ("# requested DBLOCK or IBLOCK not found"),
1210 goto check_error_and_continue;
1213 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1214 "Received reply for `%s' of type %d with UID %llu from datastore.\n",
1217 (unsigned long long) uid);
1219 if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
1222 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1223 "Found ONDEMAND block, performing on-demand encoding\n");
1225 GNUNET_STATISTICS_update (GSF_stats,
1226 gettext_noop ("# on-demand blocks matched requests"),
1229 pr->qe_start = GNUNET_TIME_absolute_get ();
1230 pr->warn_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
1231 &odc_warn_delay_task,
1234 GNUNET_FS_handle_on_demand_block (key, size, data, type, priority,
1235 anonymity, expiration, uid,
1236 &process_local_reply,
1239 GNUNET_STATISTICS_update (GSF_stats,
1240 gettext_noop ("# on-demand lookups performed successfully"),
1243 return; /* we're done */
1245 GNUNET_STATISTICS_update (GSF_stats,
1246 gettext_noop ("# on-demand lookups failed"),
1249 GNUNET_SCHEDULER_cancel (pr->warn_task);
1250 pr->warn_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
1253 pr->qe = GNUNET_DATASTORE_get_key (GSF_dsh,
1254 pr->local_result_offset - 1,
1255 &pr->public_data.query,
1256 pr->public_data.type == GNUNET_BLOCK_TYPE_FS_DBLOCK
1257 ? GNUNET_BLOCK_TYPE_ANY
1258 : pr->public_data.type,
1259 (0 != (GSF_PRO_PRIORITY_UNLIMITED & pr->public_data.options))
1261 : 1 /* queue priority */,
1262 (0 != (GSF_PRO_PRIORITY_UNLIMITED & pr->public_data.options))
1264 : 1 /* max queue size */,
1265 GNUNET_TIME_UNIT_FOREVER_REL,
1266 &process_local_reply,
1270 GNUNET_STATISTICS_update (GSF_stats,
1271 gettext_noop ("# Datastore lookups concluded (error queueing)"),
1274 return; /* we're done */
1276 goto check_error_and_continue;
1278 old_rf = pr->public_data.results_found;
1279 memset (&prq, 0, sizeof (prq));
1281 prq.expiration = expiration;
1284 GNUNET_BLOCK_get_key (GSF_block_ctx,
1291 GNUNET_DATASTORE_remove (GSF_dsh,
1295 GNUNET_TIME_UNIT_FOREVER_REL,
1297 pr->qe_start = GNUNET_TIME_absolute_get ();
1298 pr->warn_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
1301 pr->qe = GNUNET_DATASTORE_get_key (GSF_dsh,
1302 pr->local_result_offset - 1,
1303 &pr->public_data.query,
1304 pr->public_data.type == GNUNET_BLOCK_TYPE_FS_DBLOCK
1305 ? GNUNET_BLOCK_TYPE_ANY
1306 : pr->public_data.type,
1307 (0 != (GSF_PRO_PRIORITY_UNLIMITED & pr->public_data.options))
1309 : 1 /* queue priority */,
1310 (0 != (GSF_PRO_PRIORITY_UNLIMITED & pr->public_data.options))
1312 : 1 /* max queue size */,
1313 GNUNET_TIME_UNIT_FOREVER_REL,
1314 &process_local_reply,
1318 GNUNET_STATISTICS_update (GSF_stats,
1319 gettext_noop ("# Datastore lookups concluded (error queueing)"),
1322 goto check_error_and_continue;
1327 prq.priority = priority;
1328 prq.request_found = GNUNET_NO;
1329 prq.anonymity_level = anonymity;
1330 if ( (old_rf == 0) &&
1331 (pr->public_data.results_found == 0) )
1332 GSF_update_datastore_delay_ (pr->public_data.start_time);
1333 process_reply (&prq, key, pr);
1334 pr->local_result = prq.eval;
1335 if (prq.eval == GNUNET_BLOCK_EVALUATION_OK_LAST)
1337 GNUNET_STATISTICS_update (GSF_stats,
1338 gettext_noop ("# Datastore lookups concluded (found ultimate result)"),
1341 goto check_error_and_continue;
1343 if ( (0 == (GSF_PRO_PRIORITY_UNLIMITED & pr->public_data.options)) &&
1344 ( (GNUNET_YES == GSF_test_get_load_too_high_ (0)) ||
1345 (pr->public_data.results_found > 5 + 2 * pr->public_data.priority) ) )
1348 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1349 "Load too high, done with request\n");
1351 GNUNET_STATISTICS_update (GSF_stats,
1352 gettext_noop ("# Datastore lookups concluded (load too high)"),
1355 goto check_error_and_continue;
1357 pr->qe_start = GNUNET_TIME_absolute_get ();
1358 pr->warn_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
1361 pr->qe = GNUNET_DATASTORE_get_key (GSF_dsh,
1362 pr->local_result_offset++,
1363 &pr->public_data.query,
1364 pr->public_data.type == GNUNET_BLOCK_TYPE_FS_DBLOCK
1365 ? GNUNET_BLOCK_TYPE_ANY
1366 : pr->public_data.type,
1367 (0 != (GSF_PRO_PRIORITY_UNLIMITED & pr->public_data.options))
1369 : 1 /* queue priority */,
1370 (0 != (GSF_PRO_PRIORITY_UNLIMITED & pr->public_data.options))
1372 : 1 /* max queue size */,
1373 GNUNET_TIME_UNIT_FOREVER_REL,
1374 &process_local_reply,
1376 /* check if we successfully queued another datastore request;
1377 if so, return, otherwise call our continuation (if we have
1379 check_error_and_continue:
1382 if (GNUNET_SCHEDULER_NO_TASK != pr->warn_task)
1384 GNUNET_SCHEDULER_cancel (pr->warn_task);
1385 pr->warn_task = GNUNET_SCHEDULER_NO_TASK;
1387 if (NULL == (cont = pr->llc_cont))
1388 return; /* no continuation */
1389 pr->llc_cont = NULL;
1390 cont (pr->llc_cont_cls,
1397 * Look up the request in the local datastore.
1399 * @param pr the pending request to process
1400 * @param cont function to call at the end
1401 * @param cont_cls closure for cont
1404 GSF_local_lookup_ (struct GSF_PendingRequest *pr,
1405 GSF_LocalLookupContinuation cont,
1408 GNUNET_assert (NULL == pr->gh);
1409 GNUNET_assert (NULL == pr->llc_cont);
1410 pr->llc_cont = cont;
1411 pr->llc_cont_cls = cont_cls;
1412 pr->qe_start = GNUNET_TIME_absolute_get ();
1413 pr->warn_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
1416 GNUNET_STATISTICS_update (GSF_stats,
1417 gettext_noop ("# Datastore lookups initiated"),
1420 pr->qe = GNUNET_DATASTORE_get_key (GSF_dsh,
1421 pr->local_result_offset++,
1422 &pr->public_data.query,
1423 pr->public_data.type == GNUNET_BLOCK_TYPE_FS_DBLOCK
1424 ? GNUNET_BLOCK_TYPE_ANY
1425 : pr->public_data.type,
1426 (0 != (GSF_PRO_PRIORITY_UNLIMITED & pr->public_data.options))
1428 : 1 /* queue priority */,
1429 (0 != (GSF_PRO_PRIORITY_UNLIMITED & pr->public_data.options))
1431 : 1 /* max queue size */,
1432 GNUNET_TIME_UNIT_FOREVER_REL,
1433 &process_local_reply,
1437 GNUNET_STATISTICS_update (GSF_stats,
1438 gettext_noop ("# Datastore lookups concluded (error queueing)"),
1444 GNUNET_SCHEDULER_cancel (pr->warn_task);
1445 pr->warn_task = GNUNET_SCHEDULER_NO_TASK;
1446 pr->llc_cont = NULL;
1448 cont (cont_cls, pr, pr->local_result);
1454 * Handle P2P "CONTENT" message. Checks that the message is
1455 * well-formed and then checks if there are any pending requests for
1456 * this content and possibly passes it on (to local clients or other
1457 * peers). Does NOT perform migration (content caching at this peer).
1459 * @param cp the other peer involved (sender or receiver, NULL
1460 * for loopback messages where we are both sender and receiver)
1461 * @param message the actual message
1462 * @return GNUNET_OK if the message was well-formed,
1463 * GNUNET_SYSERR if the message was malformed (close connection,
1464 * do not cache under any circumstances)
1467 GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
1468 const struct GNUNET_MessageHeader *message)
1470 const struct PutMessage *put;
1473 enum GNUNET_BLOCK_Type type;
1474 struct GNUNET_TIME_Absolute expiration;
1475 GNUNET_HashCode query;
1476 struct ProcessReplyClosure prq;
1477 struct GNUNET_TIME_Relative block_time;
1479 struct PutMigrationContext *pmc;
1481 msize = ntohs (message->size);
1482 if (msize < sizeof (struct PutMessage))
1485 return GNUNET_SYSERR;
1487 put = (const struct PutMessage*) message;
1488 dsize = msize - sizeof (struct PutMessage);
1489 type = ntohl (put->type);
1490 expiration = GNUNET_TIME_absolute_ntoh (put->expiration);
1491 if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
1492 return GNUNET_SYSERR;
1494 GNUNET_BLOCK_get_key (GSF_block_ctx,
1500 GNUNET_break_op (0);
1501 return GNUNET_SYSERR;
1503 GNUNET_STATISTICS_update (GSF_stats,
1504 gettext_noop ("# GAP PUT messages received"),
1507 /* now, lookup 'query' */
1508 prq.data = (const void*) &put[1];
1515 prq.expiration = expiration;
1517 prq.anonymity_level = UINT32_MAX;
1518 prq.request_found = GNUNET_NO;
1519 GNUNET_CONTAINER_multihashmap_get_multiple (pr_map,
1525 GSF_connected_peer_change_preference_ (cp, CONTENT_BANDWIDTH_VALUE + 1000 * prq.priority);
1526 GSF_get_peer_performance_data_ (cp)->trust += prq.priority;
1528 if ( (GNUNET_YES == active_to_migration) &&
1529 (GNUNET_NO == test_put_load_too_high (prq.priority)) )
1532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1533 "Replicating result for query `%s' with priority %u\n",
1534 GNUNET_h2s (&query),
1537 pmc = GNUNET_malloc (sizeof (struct PutMigrationContext));
1538 pmc->start = GNUNET_TIME_absolute_get ();
1539 pmc->requested = prq.request_found;
1540 GNUNET_assert (0 != GSF_get_peer_performance_data_ (cp)->pid);
1541 GNUNET_PEER_resolve (GSF_get_peer_performance_data_ (cp)->pid,
1544 GNUNET_DATASTORE_put (GSF_dsh,
1545 0, &query, dsize, &put[1],
1546 type, prq.priority, 1 /* anonymity */,
1547 0 /* replication */,
1549 1 + prq.priority, MAX_DATASTORE_QUEUE,
1550 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1551 &put_migration_continuation,
1554 put_migration_continuation (pmc, GNUNET_NO, NULL);
1560 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1561 "Choosing not to keep content `%s' (%d/%d)\n",
1562 GNUNET_h2s (&query),
1563 active_to_migration,
1564 test_put_load_too_high (prq.priority));
1567 putl = GNUNET_LOAD_get_load (datastore_put_load);
1568 if ( (NULL != (cp = prq.sender)) &&
1569 (GNUNET_NO == prq.request_found) &&
1570 ( (GNUNET_YES != active_to_migration) ||
1571 (putl > 2.5 * (1 + prq.priority)) ) )
1573 if (GNUNET_YES != active_to_migration)
1574 putl = 1.0 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 5);
1575 block_time = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
1576 5000 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1577 (unsigned int) (60000 * putl * putl)));
1578 GSF_block_peer_migration_ (cp, block_time);
1585 * Setup the subsystem.
1588 GSF_pending_request_init_ ()
1591 GNUNET_CONFIGURATION_get_value_number (GSF_cfg,
1593 "MAX_PENDING_REQUESTS",
1594 &max_pending_requests))
1596 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1597 _("Configuration fails to specify `%s', assuming default value."),
1598 "MAX_PENDING_REQUESTS");
1600 active_to_migration = GNUNET_CONFIGURATION_get_value_yesno (GSF_cfg,
1603 datastore_put_load = GNUNET_LOAD_value_init (DATASTORE_LOAD_AUTODECLINE);
1604 pr_map = GNUNET_CONTAINER_multihashmap_create (32 * 1024);
1605 requests_by_expiration_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1610 * Shutdown the subsystem.
1613 GSF_pending_request_done_ ()
1615 GNUNET_CONTAINER_multihashmap_iterate (pr_map,
1618 GNUNET_CONTAINER_multihashmap_destroy (pr_map);
1620 GNUNET_CONTAINER_heap_destroy (requests_by_expiration_heap);
1621 requests_by_expiration_heap = NULL;
1622 GNUNET_LOAD_value_free (datastore_put_load);
1623 datastore_put_load = NULL;
1627 /* end of gnunet-service-fs_pr.c */