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
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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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"
38 struct GSF_PendingRequest
41 * Public data for the request.
43 struct GSF_PendingRequestData public_data;
46 * Function to call if we encounter a reply.
48 GSF_PendingRequestReplyHandler rh;
56 * Array of hash codes of replies we've already seen.
58 GNUNET_HashCode *replies_seen;
61 * Bloomfilter masking replies we've already seen.
63 struct GNUNET_CONTAINER_BloomFilter *bf;
66 * Entry for this pending request in the expiration heap, or NULL.
68 struct GNUNET_CONTAINER_HeapNode *hnode;
71 * Datastore queue entry for this request (or NULL for none).
73 struct GNUNET_DATASTORE_QueueEntry *qe;
76 * DHT request handle for this request (or NULL for none).
78 struct GNUNET_DHT_GetHandle *gh;
81 * Function to call upon completion of the local get
82 * request, or NULL for none.
84 GSF_LocalLookupContinuation llc_cont;
87 * Closure for llc_cont.
92 * Last result from the local datastore lookup evaluation.
94 enum GNUNET_BLOCK_EvaluationResult local_result;
97 * Identity of the peer that we should use for the 'sender'
98 * (recipient of the response) when forwarding (0 for none).
100 GNUNET_PEER_Id sender_pid;
103 * Number of valid entries in the 'replies_seen' array.
105 unsigned int replies_seen_count;
108 * Length of the 'replies_seen' array.
110 unsigned int replies_seen_size;
113 * Mingle value we currently use for the bf.
121 * All pending requests, ordered by the query. Entries
122 * are of type 'struct GSF_PendingRequest*'.
124 static struct GNUNET_CONTAINER_MultiHashMap *pr_map;
128 * Datastore 'PUT' load tracking.
130 static struct GNUNET_LOAD_Value *datastore_put_load;
134 * Are we allowed to migrate content to this peer.
136 static int active_to_migration;
140 * Heap with the request that will expire next at the top. Contains
141 * pointers of type "struct PendingRequest*"; these will *also* be
142 * aliased from the "requests_by_peer" data structures and the
143 * "requests_by_query" table. Note that requests from our clients
144 * don't expire and are thus NOT in the "requests_by_expiration"
145 * (or the "requests_by_peer" tables).
147 static struct GNUNET_CONTAINER_Heap *requests_by_expiration_heap;
151 * Maximum number of requests (from other peers, overall) that we're
152 * willing to have pending at any given point in time. Can be changed
153 * via the configuration file (32k is just the default).
155 static unsigned long long max_pending_requests = (32 * 1024);
159 * How many bytes should a bloomfilter be if we have already seen
160 * entry_count responses? Note that BLOOMFILTER_K gives us the number
161 * of bits set per entry. Furthermore, we should not re-size the
162 * filter too often (to keep it cheap).
164 * Since other peers will also add entries but not resize the filter,
165 * we should generally pick a slightly larger size than what the
166 * strict math would suggest.
168 * @return must be a power of two and smaller or equal to 2^15.
171 compute_bloomfilter_size (unsigned int entry_count)
174 unsigned int ideal = (entry_count * BLOOMFILTER_K) / 4;
175 uint16_t max = 1 << 15;
177 if (entry_count > max)
180 while ((size < max) && (size < ideal))
189 * Recalculate our bloom filter for filtering replies. This function
190 * will create a new bloom filter from scratch, so it should only be
191 * called if we have no bloomfilter at all (and hence can create a
192 * fresh one of minimal size without problems) OR if our peer is the
193 * initiator (in which case we may resize to larger than mimimum size).
195 * @param pr request for which the BF is to be recomputed
196 * @return GNUNET_YES if a refresh actually happened
199 refresh_bloomfilter (struct GSF_PendingRequest *pr)
203 GNUNET_HashCode mhash;
205 nsize = compute_bloomfilter_size (pr->replies_seen_count);
206 if ( (pr->bf != NULL) &&
207 (nsize == GNUNET_CONTAINER_bloomfilter_get_size (pr->bf)) )
208 return GNUNET_NO; /* size not changed */
210 GNUNET_CONTAINER_bloomfilter_free (pr->bf);
211 pr->mingle = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
213 pr->bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
216 for (i=0;i<pr->replies_seen_count;i++)
218 GNUNET_BLOCK_mingle_hash (&pr->replies_seen[i],
221 GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
228 * Create a new pending request.
230 * @param options request options
231 * @param type type of the block that is being requested
232 * @param query key for the lookup
233 * @param namespace namespace to lookup, NULL for no namespace
234 * @param target preferred target for the request, NULL for none
235 * @param bf_data raw data for bloom filter for known replies, can be NULL
236 * @param bf_size number of bytes in bf_data
237 * @param mingle mingle value for bf
238 * @param anonymity_level desired anonymity level
239 * @param priority maximum outgoing cummulative request priority to use
240 * @param ttl current time-to-live for the request
241 * @param sender_pid peer ID to use for the sender when forwarding, 0 for none
242 * @param replies_seen hash codes of known local replies
243 * @param replies_seen_count size of the 'replies_seen' array
244 * @param rh handle to call when we get a reply
245 * @param rh_cls closure for rh
246 * @return handle for the new pending request
248 struct GSF_PendingRequest *
249 GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
250 enum GNUNET_BLOCK_Type type,
251 const GNUNET_HashCode *query,
252 const GNUNET_HashCode *namespace,
253 const struct GNUNET_PeerIdentity *target,
257 uint32_t anonymity_level,
260 GNUNET_PEER_Id sender_pid,
261 const GNUNET_HashCode *replies_seen,
262 unsigned int replies_seen_count,
263 GSF_PendingRequestReplyHandler rh,
266 struct GSF_PendingRequest *pr;
267 struct GSF_PendingRequest *dpr;
270 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
271 "Creating request handle for `%s' of type %d\n",
275 pr = GNUNET_malloc (sizeof (struct GSF_PendingRequest));
276 pr->public_data.query = *query;
277 if (GNUNET_BLOCK_TYPE_FS_SBLOCK == type)
279 GNUNET_assert (NULL != namespace);
280 pr->public_data.namespace = *namespace;
284 pr->public_data.target = *target;
285 pr->public_data.has_target = GNUNET_YES;
287 pr->public_data.anonymity_level = anonymity_level;
288 pr->public_data.priority = priority;
289 pr->public_data.original_priority = priority;
290 pr->public_data.options = options;
291 pr->public_data.type = type;
292 pr->public_data.start_time = GNUNET_TIME_absolute_get ();
293 pr->sender_pid = sender_pid;
297 pr->public_data.ttl = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
300 pr->public_data.ttl = GNUNET_TIME_absolute_subtract (pr->public_data.start_time,
301 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
302 (uint32_t) (- ttl)));
303 if (replies_seen_count > 0)
305 pr->replies_seen_size = replies_seen_count;
306 pr->replies_seen = GNUNET_malloc (sizeof (GNUNET_HashCode) * pr->replies_seen_size);
307 memcpy (pr->replies_seen,
309 replies_seen_count * sizeof (GNUNET_HashCode));
310 pr->replies_seen_count = replies_seen_count;
314 pr->bf = GNUNET_CONTAINER_bloomfilter_init (bf_data,
319 else if ( (replies_seen_count > 0) &&
320 (0 != (options & GSF_PRO_BLOOMFILTER_FULL_REFRESH)) )
322 GNUNET_assert (GNUNET_YES == refresh_bloomfilter (pr));
324 GNUNET_CONTAINER_multihashmap_put (pr_map,
327 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
328 if (0 != (options & GSF_PRO_REQUEST_EXPIRES))
330 pr->hnode = GNUNET_CONTAINER_heap_insert (requests_by_expiration_heap,
332 pr->public_data.ttl.abs_value);
333 /* make sure we don't track too many requests */
334 while (GNUNET_CONTAINER_heap_get_size (requests_by_expiration_heap) > max_pending_requests)
336 dpr = GNUNET_CONTAINER_heap_peek (requests_by_expiration_heap);
337 GNUNET_assert (dpr != NULL);
339 break; /* let the request live briefly... */
340 dpr->rh (dpr->rh_cls,
342 GNUNET_TIME_UNIT_FOREVER_ABS,
343 GNUNET_BLOCK_TYPE_ANY,
345 GSF_pending_request_cancel_ (dpr);
353 * Obtain the public data associated with a pending request
355 * @param pr pending request
356 * @return associated public data
358 struct GSF_PendingRequestData *
359 GSF_pending_request_get_data_ (struct GSF_PendingRequest *pr)
361 return &pr->public_data;
366 * Update a given pending request with additional replies
367 * that have been seen.
369 * @param pr request to update
370 * @param replies_seen hash codes of replies that we've seen
371 * @param replies_seen_count size of the replies_seen array
374 GSF_pending_request_update_ (struct GSF_PendingRequest *pr,
375 const GNUNET_HashCode *replies_seen,
376 unsigned int replies_seen_count)
379 GNUNET_HashCode mhash;
381 if (replies_seen_count + pr->replies_seen_count < pr->replies_seen_count)
382 return; /* integer overflow */
383 if (0 != (pr->public_data.options & GSF_PRO_BLOOMFILTER_FULL_REFRESH))
385 /* we're responsible for the BF, full refresh */
386 if (replies_seen_count + pr->replies_seen_count > pr->replies_seen_size)
387 GNUNET_array_grow (pr->replies_seen,
388 pr->replies_seen_size,
389 replies_seen_count + pr->replies_seen_count);
390 memcpy (&pr->replies_seen[pr->replies_seen_count],
392 sizeof (GNUNET_HashCode) * replies_seen_count);
393 pr->replies_seen_count += replies_seen_count;
394 if (GNUNET_NO == refresh_bloomfilter (pr))
396 /* bf not recalculated, simply extend it with new bits */
397 for (i=0;i<pr->replies_seen_count;i++)
399 GNUNET_BLOCK_mingle_hash (&replies_seen[i],
402 GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
410 /* we're not the initiator, but the initiator did not give us
411 any bloom-filter, so we need to create one on-the-fly */
412 pr->mingle = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
414 pr->bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
415 compute_bloomfilter_size (replies_seen_count),
418 for (i=0;i<pr->replies_seen_count;i++)
420 GNUNET_BLOCK_mingle_hash (&replies_seen[i],
423 GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
430 * Generate the message corresponding to the given pending request for
431 * transmission to other peers (or at least determine its size).
433 * @param pr request to generate the message for
434 * @param buf_size number of bytes available in buf
435 * @param buf where to copy the message (can be NULL)
436 * @return number of bytes needed (if > buf_size) or used
439 GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
443 char lbuf[GNUNET_SERVER_MAX_MESSAGE_SIZE];
444 struct GetMessage *gm;
445 GNUNET_HashCode *ext;
451 struct GNUNET_TIME_Absolute now;
457 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
458 "Building request message for `%s' of type %d\n",
459 GNUNET_h2s (&pr->public_data.query),
460 pr->public_data.type);
464 do_route = (0 == (pr->public_data.options & GSF_PRO_FORWARD_ONLY));
467 bm |= GET_MESSAGE_BIT_RETURN_TO;
470 if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
472 bm |= GET_MESSAGE_BIT_SKS_NAMESPACE;
475 if (GNUNET_YES == pr->public_data.has_target)
477 bm |= GET_MESSAGE_BIT_TRANSMIT_TO;
480 bf_size = GNUNET_CONTAINER_bloomfilter_get_size (pr->bf);
481 msize = sizeof (struct GetMessage) + bf_size + k * sizeof(GNUNET_HashCode);
482 GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
483 if (buf_size < msize)
485 gm = (struct GetMessage*) lbuf;
486 gm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_GET);
487 gm->header.size = htons (msize);
488 gm->type = htonl (pr->public_data.type);
490 prio = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
491 pr->public_data.priority + 1);
494 pr->public_data.priority -= prio;
495 gm->priority = htonl (prio);
496 now = GNUNET_TIME_absolute_get ();
497 ttl = (int64_t) (pr->public_data.ttl.abs_value - now.abs_value);
498 gm->ttl = htonl (ttl / 1000);
499 gm->filter_mutator = htonl(pr->mingle);
500 gm->hash_bitmap = htonl (bm);
501 gm->query = pr->public_data.query;
502 ext = (GNUNET_HashCode*) &gm[1];
505 GNUNET_PEER_resolve (pr->sender_pid,
506 (struct GNUNET_PeerIdentity*) &ext[k++]);
507 if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
509 &pr->public_data.namespace,
510 sizeof (GNUNET_HashCode));
511 if (GNUNET_YES == pr->public_data.has_target)
512 GNUNET_PEER_resolve (pr->sender_pid,
513 (struct GNUNET_PeerIdentity*) &ext[k++]);
515 GNUNET_CONTAINER_bloomfilter_get_raw_data (pr->bf,
518 memcpy (buf, gm, msize);
524 * Iterator to free pending requests.
526 * @param cls closure, unused
527 * @param key current key code
528 * @param value value in the hash map (pending request)
529 * @return GNUNET_YES (we should continue to iterate)
532 clean_request (void *cls,
533 const GNUNET_HashCode * key,
536 struct GSF_PendingRequest *pr = value;
538 GSF_plan_notify_request_done_ (pr);
539 GNUNET_free_non_null (pr->replies_seen);
541 GNUNET_CONTAINER_bloomfilter_free (pr->bf);
542 GNUNET_PEER_change_rc (pr->sender_pid, -1);
543 if (NULL != pr->hnode)
544 GNUNET_CONTAINER_heap_remove_node (pr->hnode);
546 GNUNET_DATASTORE_cancel (pr->qe);
548 GNUNET_DHT_get_stop (pr->gh);
555 * Explicitly cancel a pending request.
557 * @param pr request to cancel
560 GSF_pending_request_cancel_ (struct GSF_PendingRequest *pr)
562 GNUNET_assert (GNUNET_OK ==
563 GNUNET_CONTAINER_multihashmap_remove (pr_map,
564 &pr->public_data.query,
566 GNUNET_assert (GNUNET_YES ==
567 clean_request (NULL, &pr->public_data.query, pr));
572 * Iterate over all pending requests.
574 * @param it function to call for each request
575 * @param cls closure for it
578 GSF_iterate_pending_requests_ (GSF_PendingRequestIterator it,
581 GNUNET_CONTAINER_multihashmap_iterate (pr_map,
582 (GNUNET_CONTAINER_HashMapIterator) it,
590 * Closure for "process_reply" function.
592 struct ProcessReplyClosure
595 * The data for the reply.
600 * Who gave us this reply? NULL for local host (or DHT)
602 struct GSF_ConnectedPeer *sender;
605 * When the reply expires.
607 struct GNUNET_TIME_Absolute expiration;
617 enum GNUNET_BLOCK_Type type;
620 * How much was this reply worth to us?
625 * Anonymity requirements for this reply.
627 uint32_t anonymity_level;
630 * Evaluation result (returned).
632 enum GNUNET_BLOCK_EvaluationResult eval;
635 * Did we find a matching request?
642 * Update the performance data for the sender (if any) since
643 * the sender successfully answered one of our queries.
645 * @param prq information about the sender
646 * @param pr request that was satisfied
649 update_request_performance_data (struct ProcessReplyClosure *prq,
650 struct GSF_PendingRequest *pr)
652 if (prq->sender == NULL)
654 GSF_peer_update_performance_ (prq->sender,
655 pr->public_data.start_time,
661 * We have received a reply; handle it!
663 * @param cls response (struct ProcessReplyClosure)
664 * @param key our query
665 * @param value value in the hash map (info about the query)
666 * @return GNUNET_YES (we should continue to iterate)
669 process_reply (void *cls,
670 const GNUNET_HashCode * key,
673 struct ProcessReplyClosure *prq = cls;
674 struct GSF_PendingRequest *pr = value;
675 GNUNET_HashCode chash;
678 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
679 "Matched result (type %u) for query `%s' with pending request\n",
680 (unsigned int) prq->type,
683 GNUNET_STATISTICS_update (GSF_stats,
684 gettext_noop ("# replies received and matched"),
687 prq->eval = GNUNET_BLOCK_evaluate (GSF_block_ctx,
692 &pr->public_data.namespace,
693 (prq->type == GNUNET_BLOCK_TYPE_FS_SBLOCK) ? sizeof (GNUNET_HashCode) : 0,
698 case GNUNET_BLOCK_EVALUATION_OK_MORE:
699 update_request_performance_data (prq, pr);
701 case GNUNET_BLOCK_EVALUATION_OK_LAST:
702 /* short cut: stop processing early, no BF-update, etc. */
703 update_request_performance_data (prq, pr);
704 GNUNET_LOAD_update (GSF_rt_entry_lifetime,
705 GNUNET_TIME_absolute_get_duration (pr->public_data.start_time).rel_value);
706 /* pass on to other peers / local clients */
711 prq->data, prq->size);
712 GSF_pending_request_cancel_ (pr);
714 case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
715 GNUNET_STATISTICS_update (GSF_stats,
716 gettext_noop ("# duplicate replies discarded (bloomfilter)"),
720 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
721 "Duplicate response `%s', discarding.\n",
722 GNUNET_h2s (&mhash));
724 return GNUNET_YES; /* duplicate */
725 case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
726 return GNUNET_YES; /* wrong namespace */
727 case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
730 case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
733 case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
734 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
735 _("Unsupported block type %u\n"),
739 /* update bloomfilter */
740 GNUNET_CRYPTO_hash (prq->data,
743 GSF_pending_request_update_ (pr, &chash, 1);
744 if (NULL == prq->sender)
747 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
748 "Found result for query `%s' in local datastore\n",
751 GNUNET_STATISTICS_update (GSF_stats,
752 gettext_noop ("# results found locally"),
758 GSF_dht_lookup_ (pr);
760 prq->priority += pr->public_data.original_priority;
761 pr->public_data.priority = 0;
762 pr->public_data.original_priority = 0;
763 pr->public_data.results_found++;
764 prq->request_found = GNUNET_YES;
765 /* finally, pass on to other peer / local client */
770 prq->data, prq->size);
776 * Context for the 'put_migration_continuation'.
778 struct PutMigrationContext
782 * Start time for the operation.
784 struct GNUNET_TIME_Absolute start;
789 struct GNUNET_PeerIdentity origin;
792 * GNUNET_YES if we had a matching request for this block,
800 * Continuation called to notify client about result of the
804 * @param success GNUNET_SYSERR on failure
805 * @param msg NULL on success, otherwise an error message
808 put_migration_continuation (void *cls,
812 struct PutMigrationContext *pmc = cls;
813 struct GNUNET_TIME_Relative delay;
814 struct GNUNET_TIME_Relative block_time;
815 struct GSF_ConnectedPeer *cp;
816 struct GSF_PeerPerformanceData *ppd;
818 delay = GNUNET_TIME_absolute_get_duration (pmc->start);
819 cp = GSF_peer_get_ (&pmc->origin);
820 if ( (GNUNET_OK != success) &&
821 (GNUNET_NO == pmc->requested) )
823 /* block migration for a bit... */
826 ppd = GSF_get_peer_performance_data_ (cp);
827 ppd->migration_duplication++;
828 block_time = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
829 5 * ppd->migration_duplication +
830 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 5));
831 GSF_block_peer_migration_ (cp, block_time);
838 ppd = GSF_get_peer_performance_data_ (cp);
839 ppd->migration_duplication = 0; /* reset counter */
843 /* FIXME: should we really update the load value on failure? */
844 GNUNET_LOAD_update (datastore_put_load,
846 if (GNUNET_OK == success)
848 GNUNET_STATISTICS_update (GSF_stats,
849 gettext_noop ("# datastore 'put' failures"),
856 * Test if the DATABASE (PUT) load on this peer is too high
857 * to even consider processing the query at
860 * @return GNUNET_YES if the load is too high to do anything (load high)
861 * GNUNET_NO to process normally (load normal or low)
864 test_put_load_too_high (uint32_t priority)
868 if (GNUNET_LOAD_get_average (datastore_put_load) < 50)
869 return GNUNET_NO; /* very fast */
870 ld = GNUNET_LOAD_get_load (datastore_put_load);
871 if (ld < 2.0 * (1 + priority))
873 GNUNET_STATISTICS_update (GSF_stats,
874 gettext_noop ("# storage requests dropped due to high load"),
882 * Iterator called on each result obtained for a DHT
883 * operation that expects a reply
886 * @param exp when will this value expire
887 * @param key key of the result
888 * @param get_path NULL-terminated array of pointers
889 * to the peers on reverse GET path (or NULL if not recorded)
890 * @param put_path NULL-terminated array of pointers
891 * to the peers on the PUT path (or NULL if not recorded)
892 * @param type type of the result
893 * @param size number of bytes in data
894 * @param data pointer to the result data
897 handle_dht_reply (void *cls,
898 struct GNUNET_TIME_Absolute exp,
899 const GNUNET_HashCode *key,
900 const struct GNUNET_PeerIdentity * const *get_path,
901 const struct GNUNET_PeerIdentity * const *put_path,
902 enum GNUNET_BLOCK_Type type,
906 struct GSF_PendingRequest *pr = cls;
907 struct ProcessReplyClosure prq;
908 struct PutMigrationContext *pmc;
910 memset (&prq, 0, sizeof (prq));
912 prq.expiration = exp;
915 process_reply (&prq, key, pr);
916 if ( (GNUNET_YES == active_to_migration) &&
917 (GNUNET_NO == test_put_load_too_high (prq.priority)) )
920 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
921 "Replicating result for query `%s' with priority %u\n",
925 pmc = GNUNET_malloc (sizeof (struct PutMigrationContext));
926 pmc->start = GNUNET_TIME_absolute_get ();
927 pmc->requested = GNUNET_YES;
928 GNUNET_DATASTORE_put (GSF_dsh,
930 type, prq.priority, 1 /* anonymity */,
933 1 + prq.priority, MAX_DATASTORE_QUEUE,
934 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
935 &put_migration_continuation,
942 * Consider looking up the data in the DHT (anonymity-level permitting).
944 * @param pr the pending request to process
947 GSF_dht_lookup_ (struct GSF_PendingRequest *pr)
951 struct GNUNET_PeerIdentity pi;
952 char buf[sizeof (GNUNET_HashCode) * 2];
954 if (0 != pr->public_data.anonymity_level)
958 GNUNET_DHT_get_stop (pr->gh);
963 if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
966 memcpy (buf, &pr->public_data.namespace, sizeof (GNUNET_HashCode));
967 xquery_size = sizeof (GNUNET_HashCode);
969 if (0 != (pr->public_data.options & GSF_PRO_FORWARD_ONLY))
971 GNUNET_PEER_resolve (pr->sender_pid,
973 memcpy (&buf[xquery_size], &pi, sizeof (struct GNUNET_PeerIdentity));
974 xquery_size += sizeof (struct GNUNET_PeerIdentity);
976 pr->gh = GNUNET_DHT_get_start (GSF_dht,
977 GNUNET_TIME_UNIT_FOREVER_REL,
978 pr->public_data.type,
979 &pr->public_data.query,
980 DEFAULT_GET_REPLICATION,
981 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
991 * We're processing (local) results for a search request
992 * from another peer. Pass applicable results to the
993 * peer and if we are done either clean up (operation
994 * complete) or forward to other peers (more results possible).
996 * @param cls our closure (struct PendingRequest)
997 * @param key key for the content
998 * @param size number of bytes in data
999 * @param data content stored
1000 * @param type type of the content
1001 * @param priority priority of the content
1002 * @param anonymity anonymity-level for the content
1003 * @param expiration expiration time for the content
1004 * @param uid unique identifier for the datum;
1005 * maybe 0 if no unique identifier is available
1008 process_local_reply (void *cls,
1009 const GNUNET_HashCode * key,
1012 enum GNUNET_BLOCK_Type type,
1015 struct GNUNET_TIME_Absolute expiration,
1018 struct GSF_PendingRequest *pr = cls;
1019 GSF_LocalLookupContinuation cont;
1020 struct ProcessReplyClosure prq;
1021 GNUNET_HashCode query;
1022 unsigned int old_rf;
1027 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1028 "No further local responses available.\n");
1031 if (NULL != (cont = pr->llc_cont))
1033 pr->llc_cont = NULL;
1034 cont (pr->llc_cont_cls,
1041 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1042 "New local response to `%s' of type %u.\n",
1046 if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
1049 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1050 "Found ONDEMAND block, performing on-demand encoding\n");
1052 GNUNET_STATISTICS_update (GSF_stats,
1053 gettext_noop ("# on-demand blocks matched requests"),
1057 GNUNET_FS_handle_on_demand_block (key, size, data, type, priority,
1058 anonymity, expiration, uid,
1059 &process_local_reply,
1063 GNUNET_DATASTORE_iterate_get_next (GSF_dsh);
1067 old_rf = pr->public_data.results_found;
1068 memset (&prq, 0, sizeof (prq));
1070 prq.expiration = expiration;
1073 GNUNET_BLOCK_get_key (GSF_block_ctx,
1080 GNUNET_DATASTORE_remove (GSF_dsh,
1084 GNUNET_TIME_UNIT_FOREVER_REL,
1086 GNUNET_DATASTORE_iterate_get_next (GSF_dsh);
1090 prq.priority = priority;
1091 prq.request_found = GNUNET_NO;
1092 prq.anonymity_level = anonymity;
1093 if ( (old_rf == 0) &&
1094 (pr->public_data.results_found == 0) )
1095 GSF_update_datastore_delay_ (pr->public_data.start_time);
1096 process_reply (&prq, key, pr);
1097 pr->local_result = prq.eval;
1101 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1102 "Request cancelled, not asking datastore for more\n");
1105 if ( (0 == (GSF_PRO_PRIORITY_UNLIMITED & pr->public_data.options)) &&
1106 ( (GNUNET_YES == GSF_test_get_load_too_high_ (0)) ||
1107 (pr->public_data.results_found > 5 + 2 * pr->public_data.priority) ) )
1110 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1111 "Load too high, done with request\n");
1113 GNUNET_STATISTICS_update (GSF_stats,
1114 gettext_noop ("# processing result set cut short due to load"),
1117 GNUNET_DATASTORE_cancel (pr->qe);
1119 if (NULL != (cont = pr->llc_cont))
1121 pr->llc_cont = NULL;
1122 cont (pr->llc_cont_cls,
1128 GNUNET_DATASTORE_iterate_get_next (GSF_dsh);
1133 * Look up the request in the local datastore.
1135 * @param pr the pending request to process
1136 * @param cont function to call at the end
1137 * @param cont_cls closure for cont
1140 GSF_local_lookup_ (struct GSF_PendingRequest *pr,
1141 GSF_LocalLookupContinuation cont,
1144 GNUNET_assert (NULL == pr->gh);
1145 GNUNET_assert (NULL == pr->llc_cont);
1146 pr->llc_cont = cont;
1147 pr->llc_cont_cls = cont_cls;
1148 pr->qe = GNUNET_DATASTORE_iterate_key (GSF_dsh,
1149 &pr->public_data.query,
1150 pr->public_data.type == GNUNET_BLOCK_TYPE_FS_DBLOCK
1151 ? GNUNET_BLOCK_TYPE_ANY
1152 : pr->public_data.type,
1153 (0 != (GSF_PRO_PRIORITY_UNLIMITED & pr->public_data.options))
1155 : 1 /* queue priority */,
1156 (0 != (GSF_PRO_PRIORITY_UNLIMITED & pr->public_data.options))
1158 : 1 /* max queue size */,
1159 GNUNET_TIME_UNIT_FOREVER_REL,
1160 &process_local_reply,
1167 * Handle P2P "CONTENT" message. Checks that the message is
1168 * well-formed and then checks if there are any pending requests for
1169 * this content and possibly passes it on (to local clients or other
1170 * peers). Does NOT perform migration (content caching at this peer).
1172 * @param cp the other peer involved (sender or receiver, NULL
1173 * for loopback messages where we are both sender and receiver)
1174 * @param message the actual message
1175 * @return GNUNET_OK if the message was well-formed,
1176 * GNUNET_SYSERR if the message was malformed (close connection,
1177 * do not cache under any circumstances)
1180 GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
1181 const struct GNUNET_MessageHeader *message)
1183 const struct PutMessage *put;
1186 enum GNUNET_BLOCK_Type type;
1187 struct GNUNET_TIME_Absolute expiration;
1188 GNUNET_HashCode query;
1189 struct ProcessReplyClosure prq;
1190 struct GNUNET_TIME_Relative block_time;
1192 struct PutMigrationContext *pmc;
1194 msize = ntohs (message->size);
1195 if (msize < sizeof (struct PutMessage))
1198 return GNUNET_SYSERR;
1200 put = (const struct PutMessage*) message;
1201 dsize = msize - sizeof (struct PutMessage);
1202 type = ntohl (put->type);
1203 expiration = GNUNET_TIME_absolute_ntoh (put->expiration);
1204 if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
1205 return GNUNET_SYSERR;
1207 GNUNET_BLOCK_get_key (GSF_block_ctx,
1213 GNUNET_break_op (0);
1214 return GNUNET_SYSERR;
1216 /* now, lookup 'query' */
1217 prq.data = (const void*) &put[1];
1224 prq.expiration = expiration;
1226 prq.anonymity_level = 1;
1227 prq.request_found = GNUNET_NO;
1228 GNUNET_CONTAINER_multihashmap_get_multiple (pr_map,
1234 GSF_connected_peer_change_preference_ (cp, CONTENT_BANDWIDTH_VALUE + 1000 * prq.priority);
1235 GSF_get_peer_performance_data_ (cp)->trust += prq.priority;
1237 if ( (GNUNET_YES == active_to_migration) &&
1238 (GNUNET_NO == test_put_load_too_high (prq.priority)) )
1241 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1242 "Replicating result for query `%s' with priority %u\n",
1243 GNUNET_h2s (&query),
1246 pmc = GNUNET_malloc (sizeof (struct PutMigrationContext));
1247 pmc->start = GNUNET_TIME_absolute_get ();
1248 pmc->requested = prq.request_found;
1249 GNUNET_PEER_resolve (GSF_get_peer_performance_data_ (cp)->pid,
1251 GNUNET_DATASTORE_put (GSF_dsh,
1252 0, &query, dsize, &put[1],
1253 type, prq.priority, 1 /* anonymity */,
1254 0 /* replication */,
1256 1 + prq.priority, MAX_DATASTORE_QUEUE,
1257 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1258 &put_migration_continuation,
1264 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1265 "Choosing not to keep content `%s' (%d/%d)\n",
1266 GNUNET_h2s (&query),
1267 active_to_migration,
1268 test_put_load_too_high (prq.priority));
1271 putl = GNUNET_LOAD_get_load (datastore_put_load);
1272 if ( (NULL != (cp = prq.sender)) &&
1273 (GNUNET_NO == prq.request_found) &&
1274 ( (GNUNET_YES != active_to_migration) ||
1275 (putl > 2.5 * (1 + prq.priority)) ) )
1277 if (GNUNET_YES != active_to_migration)
1278 putl = 1.0 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 5);
1279 block_time = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
1280 5000 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1281 (unsigned int) (60000 * putl * putl)));
1282 GSF_block_peer_migration_ (cp, block_time);
1289 * Setup the subsystem.
1292 GSF_pending_request_init_ ()
1295 GNUNET_CONFIGURATION_get_value_number (GSF_cfg,
1297 "MAX_PENDING_REQUESTS",
1298 &max_pending_requests))
1300 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1301 _("Configuration fails to specify `%s', assuming default value."),
1302 "MAX_PENDING_REQUESTS");
1304 active_to_migration = GNUNET_CONFIGURATION_get_value_yesno (GSF_cfg,
1307 datastore_put_load = GNUNET_LOAD_value_init (DATASTORE_LOAD_AUTODECLINE);
1308 pr_map = GNUNET_CONTAINER_multihashmap_create (32 * 1024);
1309 requests_by_expiration_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1314 * Shutdown the subsystem.
1317 GSF_pending_request_done_ ()
1319 GNUNET_CONTAINER_multihashmap_iterate (pr_map,
1322 GNUNET_CONTAINER_multihashmap_destroy (pr_map);
1324 GNUNET_CONTAINER_heap_destroy (requests_by_expiration_heap);
1325 requests_by_expiration_heap = NULL;
1326 GNUNET_LOAD_value_free (datastore_put_load);
1327 datastore_put_load = NULL;
1331 /* end of gnunet-service-fs_pr.c */