2 This file is part of GNUnet.
3 (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
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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_cp.h"
29 #include "gnunet-service-fs_pr.h"
35 struct GSF_PendingRequest
38 * Public data for the request.
40 struct GSF_PendingRequestData public_data;
43 * Function to call if we encounter a reply.
45 GSF_PendingRequestReplyHandler rh;
53 * Array of hash codes of replies we've already seen.
55 GNUNET_HashCode *replies_seen;
58 * Bloomfilter masking replies we've already seen.
60 struct GNUNET_CONTAINER_BloomFilter *bf;
63 * Entry for this pending request in the expiration heap, or NULL.
65 struct GNUNET_CONTAINER_HeapNode *hnode;
68 * Datastore queue entry for this request (or NULL for none).
70 struct GNUNET_DATASTORE_QueueEntry *qe;
73 * DHT request handle for this request (or NULL for none).
75 struct GNUNET_DHT_GetHandle *gh;
78 * Identity of the peer that we should use for the 'sender'
79 * (recipient of the response) when forwarding (0 for none).
81 GNUNET_PEER_Id sender_pid;
84 * Number of valid entries in the 'replies_seen' array.
86 unsigned int replies_seen_count;
89 * Length of the 'replies_seen' array.
91 unsigned int replies_seen_size;
94 * Mingle value we currently use for the bf.
102 * All pending requests, ordered by the query. Entries
103 * are of type 'struct GSF_PendingRequest*'.
105 static struct GNUNET_CONTAINER_MultiHashMap *pr_map;
109 * Datastore 'PUT' load tracking.
111 static struct GNUNET_LOAD_Value *datastore_put_load;
115 * Are we allowed to migrate content to this peer.
117 static int active_to_migration;
121 * Heap with the request that will expire next at the top. Contains
122 * pointers of type "struct PendingRequest*"; these will *also* be
123 * aliased from the "requests_by_peer" data structures and the
124 * "requests_by_query" table. Note that requests from our clients
125 * don't expire and are thus NOT in the "requests_by_expiration"
126 * (or the "requests_by_peer" tables).
128 static struct GNUNET_CONTAINER_Heap *requests_by_expiration_heap;
132 * Maximum number of requests (from other peers, overall) that we're
133 * willing to have pending at any given point in time. Can be changed
134 * via the configuration file (32k is just the default).
136 static unsigned long long max_pending_requests = (32 * 1024);
140 * How many bytes should a bloomfilter be if we have already seen
141 * entry_count responses? Note that BLOOMFILTER_K gives us the number
142 * of bits set per entry. Furthermore, we should not re-size the
143 * filter too often (to keep it cheap).
145 * Since other peers will also add entries but not resize the filter,
146 * we should generally pick a slightly larger size than what the
147 * strict math would suggest.
149 * @return must be a power of two and smaller or equal to 2^15.
152 compute_bloomfilter_size (unsigned int entry_count)
155 unsigned int ideal = (entry_count * BLOOMFILTER_K) / 4;
156 uint16_t max = 1 << 15;
158 if (entry_count > max)
161 while ((size < max) && (size < ideal))
170 * Recalculate our bloom filter for filtering replies. This function
171 * will create a new bloom filter from scratch, so it should only be
172 * called if we have no bloomfilter at all (and hence can create a
173 * fresh one of minimal size without problems) OR if our peer is the
174 * initiator (in which case we may resize to larger than mimimum size).
176 * @param pr request for which the BF is to be recomputed
177 * @return GNUNET_YES if a refresh actually happened
180 refresh_bloomfilter (struct GSF_PendingRequest *pr)
184 GNUNET_HashCode mhash;
186 nsize = compute_bloomfilter_size (pr->replies_seen_count);
187 if ( (pr->bf != NULL) &&
188 (nsize == GNUNET_CONTAINER_bloomfilter_get_size (pr->bf)) )
189 return GNUNET_NO; /* size not changed */
191 GNUNET_CONTAINER_bloomfilter_free (pr->bf);
192 pr->mingle = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
194 pr->bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
197 for (i=0;i<pr->replies_seen_count;i++)
199 GNUNET_BLOCK_mingle_hash (&pr->replies_seen[i],
202 GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
209 * Create a new pending request.
211 * @param options request options
212 * @param type type of the block that is being requested
213 * @param query key for the lookup
214 * @param namespace namespace to lookup, NULL for no namespace
215 * @param target preferred target for the request, NULL for none
216 * @param bf_data raw data for bloom filter for known replies, can be NULL
217 * @param bf_size number of bytes in bf_data
218 * @param mingle mingle value for bf
219 * @param anonymity_level desired anonymity level
220 * @param priority maximum outgoing cummulative request priority to use
221 * @param ttl current time-to-live for the request
222 * @param sender_pid peer ID to use for the sender when forwarding, 0 for none
223 * @param replies_seen hash codes of known local replies
224 * @param replies_seen_count size of the 'replies_seen' array
225 * @param rh handle to call when we get a reply
226 * @param rh_cls closure for rh
227 * @return handle for the new pending request
229 struct GSF_PendingRequest *
230 GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
231 enum GNUNET_BLOCK_Type type,
232 const GNUNET_HashCode *query,
233 const GNUNET_HashCode *namespace,
234 const struct GNUNET_PeerIdentity *target,
238 uint32_t anonymity_level,
241 GNUNET_PEER_Id sender_pid,
242 const GNUNET_HashCode *replies_seen,
243 unsigned int replies_seen_count,
244 GSF_PendingRequestReplyHandler rh,
247 struct GSF_PendingRequest *pr;
248 struct GSF_PendingRequest *dpr;
250 pr = GNUNET_malloc (sizeof (struct GSF_PendingRequest));
251 pr->public_data.query = *query;
252 if (GNUNET_BLOCK_TYPE_FS_SBLOCK == type)
254 GNUNET_assert (NULL != namespace);
255 pr->public_data.namespace = *namespace;
259 pr->public_data.target = *target;
260 pr->public_data.has_target = GNUNET_YES;
262 pr->public_data.anonymity_level = anonymity_level;
263 pr->public_data.priority = priority;
264 pr->public_data.original_priority = priority;
265 pr->public_data.options = options;
266 pr->public_data.type = type;
267 pr->public_data.start_time = GNUNET_TIME_absolute_get ();
268 pr->sender_pid = sender_pid;
272 pr->public_data.ttl = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
275 pr->public_data.ttl = GNUNET_TIME_absolute_subtract (pr->public_data.start_time,
276 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
277 (uint32_t) (- ttl)));
278 if (replies_seen_count > 0)
280 pr->replies_seen_size = replies_seen_count;
281 pr->replies_seen = GNUNET_malloc (sizeof (GNUNET_HashCode) * pr->replies_seen_size);
282 memcpy (pr->replies_seen,
284 replies_seen_count * sizeof (GNUNET_HashCode));
285 pr->replies_seen_count = replies_seen_count;
289 pr->bf = GNUNET_CONTAINER_bloomfilter_init (bf_data,
294 else if ( (replies_seen_count > 0) &&
295 (0 != (options & GSF_PRO_BLOOMFILTER_FULL_REFRESH)) )
297 GNUNET_assert (GNUNET_YES == refresh_bloomfilter (pr));
299 GNUNET_CONTAINER_multihashmap_put (pr_map,
302 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
303 if (0 != (options & GSF_PRO_REQUEST_EXPIRES))
305 pr->hnode = GNUNET_CONTAINER_heap_insert (requests_by_expiration_heap,
307 pr->public_data.ttl.abs_value);
308 /* make sure we don't track too many requests */
309 while (GNUNET_CONTAINER_heap_get_size (requests_by_expiration_heap) > max_pending_requests)
311 dpr = GNUNET_CONTAINER_heap_peek (requests_by_expiration_heap);
312 GNUNET_assert (dpr != NULL);
314 break; /* let the request live briefly... */
315 dpr->rh (dpr->rh_cls,
317 GNUNET_TIME_UNIT_FOREVER_ABS,
320 GSF_pending_request_cancel_ (dpr);
328 * Obtain the public data associated with a pending request
330 * @param pr pending request
331 * @return associated public data
333 struct GSF_PendingRequestData *
334 GSF_pending_request_get_data_ (struct GSF_PendingRequest *pr)
336 return &pr->public_data;
341 * Update a given pending request with additional replies
342 * that have been seen.
344 * @param pr request to update
345 * @param replies_seen hash codes of replies that we've seen
346 * @param replies_seen_count size of the replies_seen array
349 GSF_pending_request_update_ (struct GSF_PendingRequest *pr,
350 const GNUNET_HashCode *replies_seen,
351 unsigned int replies_seen_count)
354 GNUNET_HashCode mhash;
356 if (replies_seen_count + pr->replies_seen_count < pr->replies_seen_count)
357 return; /* integer overflow */
358 if (0 != (pr->public_data.options & GSF_PRO_BLOOMFILTER_FULL_REFRESH))
360 /* we're responsible for the BF, full refresh */
361 if (replies_seen_count + pr->replies_seen_count > pr->replies_seen_size)
362 GNUNET_array_grow (pr->replies_seen,
363 pr->replies_seen_size,
364 replies_seen_count + pr->replies_seen_count);
365 memcpy (&pr->replies_seen[pr->replies_seen_count],
367 sizeof (GNUNET_HashCode) * replies_seen_count);
368 pr->replies_seen_count += replies_seen_count;
369 if (GNUNET_NO == refresh_bloomfilter (pr))
371 /* bf not recalculated, simply extend it with new bits */
372 for (i=0;i<pr->replies_seen_count;i++)
374 GNUNET_BLOCK_mingle_hash (&replies_seen[i],
377 GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
385 /* we're not the initiator, but the initiator did not give us
386 any bloom-filter, so we need to create one on-the-fly */
387 pr->mingle = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
389 pr->bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
390 compute_bloomfilter_size (replies_seen_count),
393 for (i=0;i<pr->replies_seen_count;i++)
395 GNUNET_BLOCK_mingle_hash (&replies_seen[i],
398 GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
405 * Generate the message corresponding to the given pending request for
406 * transmission to other peers (or at least determine its size).
408 * @param pr request to generate the message for
409 * @param do_route are we routing the reply
410 * @param buf_size number of bytes available in buf
411 * @param buf where to copy the message (can be NULL)
412 * @return number of bytes needed (if > buf_size) or used
415 GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
420 char lbuf[GNUNET_SERVER_MAX_MESSAGE_SIZE];
421 struct GetMessage *gm;
422 GNUNET_HashCode *ext;
428 struct GNUNET_TIME_Absolute now;
433 if (GNUNET_YES != do_route)
435 bm |= GET_MESSAGE_BIT_RETURN_TO;
438 if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
440 bm |= GET_MESSAGE_BIT_SKS_NAMESPACE;
443 if (GNUNET_YES == pr->public_data.has_target)
445 bm |= GET_MESSAGE_BIT_TRANSMIT_TO;
448 bf_size = GNUNET_CONTAINER_bloomfilter_get_size (pr->bf);
449 msize = sizeof (struct GetMessage) + bf_size + k * sizeof(GNUNET_HashCode);
450 GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
451 if (buf_size < msize)
453 gm = (struct GetMessage*) lbuf;
454 gm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_GET);
455 gm->header.size = htons (msize);
456 gm->type = htonl (pr->public_data.type);
457 if (GNUNET_YES == do_route)
458 prio = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
459 pr->public_data.priority + 1);
462 pr->public_data.priority -= prio;
463 gm->priority = htonl (prio);
464 now = GNUNET_TIME_absolute_get ();
465 ttl = (int64_t) (pr->public_data.ttl.abs_value - now.abs_value);
466 gm->ttl = htonl (ttl / 1000);
467 gm->filter_mutator = htonl(pr->mingle);
468 gm->hash_bitmap = htonl (bm);
469 gm->query = pr->public_data.query;
470 ext = (GNUNET_HashCode*) &gm[1];
472 if (GNUNET_YES != do_route)
473 GNUNET_PEER_resolve (pr->sender_pid,
474 (struct GNUNET_PeerIdentity*) &ext[k++]);
475 if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
477 &pr->public_data.namespace,
478 sizeof (GNUNET_HashCode));
479 if (GNUNET_YES == pr->public_data.has_target)
480 GNUNET_PEER_resolve (pr->sender_pid,
481 (struct GNUNET_PeerIdentity*) &ext[k++]);
483 GNUNET_CONTAINER_bloomfilter_get_raw_data (pr->bf,
486 memcpy (buf, gm, msize);
492 * Iterator to free pending requests.
494 * @param cls closure, unused
495 * @param key current key code
496 * @param value value in the hash map (pending request)
497 * @return GNUNET_YES (we should continue to iterate)
500 clean_request (void *cls,
501 const GNUNET_HashCode * key,
504 struct GSF_PendingRequest *pr = value;
506 GNUNET_free_non_null (pr->replies_seen);
508 GNUNET_CONTAINER_bloomfilter_free (pr->bf);
509 GNUNET_PEER_change_rc (pr->sender_pid, -1);
510 if (NULL != pr->hnode)
511 GNUNET_CONTAINER_heap_remove_node (requests_by_expiration_heap,
514 GNUNET_DATASTORE_cancel (pr->qe);
516 GNUNET_DHT_get_stop (pr->gh);
523 * Explicitly cancel a pending request.
525 * @param pr request to cancel
528 GSF_pending_request_cancel_ (struct GSF_PendingRequest *pr)
530 GNUNET_assert (GNUNET_OK ==
531 GNUNET_CONTAINER_multihashmap_remove (pr_map,
532 &pr->public_data.query,
534 GNUNET_assert (GNUNET_YES ==
535 clean_request (NULL, &pr->public_data.query, pr));
540 * Iterate over all pending requests.
542 * @param it function to call for each request
543 * @param cls closure for it
546 GSF_iterate_pending_requests_ (GSF_PendingRequestIterator it,
549 GNUNET_CONTAINER_multihashmap_iterate (pr_map,
550 (GNUNET_CONTAINER_HashMapIterator) it,
558 * Closure for "process_reply" function.
560 struct ProcessReplyClosure
563 * The data for the reply.
568 * Who gave us this reply? NULL for local host (or DHT)
570 struct GSF_ConnectedPeer *sender;
573 * When the reply expires.
575 struct GNUNET_TIME_Absolute expiration;
585 enum GNUNET_BLOCK_Type type;
588 * How much was this reply worth to us?
593 * Anonymity requirements for this reply.
595 uint32_t anonymity_level;
598 * Evaluation result (returned).
600 enum GNUNET_BLOCK_EvaluationResult eval;
603 * Did we finish processing the associated request?
608 * Did we find a matching request?
615 * Update the performance data for the sender (if any) since
616 * the sender successfully answered one of our queries.
618 * @param prq information about the sender
619 * @param pr request that was satisfied
622 update_request_performance_data (struct ProcessReplyClosure *prq,
623 struct GSF_PendingRequest *pr)
625 if (prq->sender == NULL)
627 GSF_peer_update_performance_ (prq->sender,
628 pr->public_data.start_time,
634 * We have received a reply; handle it!
636 * @param cls response (struct ProcessReplyClosure)
637 * @param key our query
638 * @param value value in the hash map (info about the query)
639 * @return GNUNET_YES (we should continue to iterate)
642 process_reply (void *cls,
643 const GNUNET_HashCode * key,
646 struct ProcessReplyClosure *prq = cls;
647 struct GSF_PendingRequest *pr = value;
648 GNUNET_HashCode chash;
651 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
652 "Matched result (type %u) for query `%s' with pending request\n",
653 (unsigned int) prq->type,
656 GNUNET_STATISTICS_update (GSF_stats,
657 gettext_noop ("# replies received and matched"),
660 prq->eval = GNUNET_BLOCK_evaluate (GSF_block_ctx,
665 &pr->public_data.namespace,
666 (prq->type == GNUNET_BLOCK_TYPE_FS_SBLOCK) ? sizeof (GNUNET_HashCode) : 0,
671 case GNUNET_BLOCK_EVALUATION_OK_MORE:
672 update_request_performance_data (prq, pr);
674 case GNUNET_BLOCK_EVALUATION_OK_LAST:
675 /* short cut: stop processing early, no BF-update, etc. */
676 update_request_performance_data (prq, pr);
677 GNUNET_LOAD_update (GSF_rt_entry_lifetime,
678 GNUNET_TIME_absolute_get_duration (pr->public_data.start_time).rel_value);
679 /* pass on to other peers / local clients */
683 prq->data, prq->size,
685 /* destroy request, we're done */
686 GSF_pending_request_cancel_ (pr);
688 case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
689 GNUNET_STATISTICS_update (GSF_stats,
690 gettext_noop ("# duplicate replies discarded (bloomfilter)"),
694 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
695 "Duplicate response `%s', discarding.\n",
696 GNUNET_h2s (&mhash));
698 return GNUNET_YES; /* duplicate */
699 case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
700 return GNUNET_YES; /* wrong namespace */
701 case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
704 case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
707 case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
708 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
709 _("Unsupported block type %u\n"),
713 /* update bloomfilter */
714 GNUNET_CRYPTO_hash (prq->data,
717 GSF_pending_request_update_ (pr, &chash, 1);
718 if (NULL == prq->sender)
721 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
722 "Found result for query `%s' in local datastore\n",
725 GNUNET_STATISTICS_update (GSF_stats,
726 gettext_noop ("# results found locally"),
732 GSF_dht_lookup_ (pr);
734 prq->priority += pr->public_data.original_priority;
735 pr->public_data.priority = 0;
736 pr->public_data.original_priority = 0;
737 pr->public_data.results_found++;
738 prq->request_found = GNUNET_YES;
739 /* finally, pass on to other peer / local client */
743 prq->data, prq->size,
750 * Continuation called to notify client about result of the
754 * @param success GNUNET_SYSERR on failure
755 * @param msg NULL on success, otherwise an error message
758 put_migration_continuation (void *cls,
762 struct GNUNET_TIME_Absolute *start = cls;
763 struct GNUNET_TIME_Relative delay;
765 delay = GNUNET_TIME_absolute_get_duration (*start);
767 /* FIXME: should we really update the load value on failure? */
768 GNUNET_LOAD_update (datastore_put_load,
770 if (GNUNET_OK == success)
772 GNUNET_STATISTICS_update (GSF_stats,
773 gettext_noop ("# datastore 'put' failures"),
780 * Test if the DATABASE (PUT) load on this peer is too high
781 * to even consider processing the query at
784 * @return GNUNET_YES if the load is too high to do anything (load high)
785 * GNUNET_NO to process normally (load normal or low)
788 test_put_load_too_high (uint32_t priority)
792 if (GNUNET_LOAD_get_average (datastore_put_load) < 50)
793 return GNUNET_NO; /* very fast */
794 ld = GNUNET_LOAD_get_load (datastore_put_load);
795 if (ld < 2.0 * (1 + priority))
797 GNUNET_STATISTICS_update (GSF_stats,
798 gettext_noop ("# storage requests dropped due to high load"),
806 * Iterator called on each result obtained for a DHT
807 * operation that expects a reply
810 * @param exp when will this value expire
811 * @param key key of the result
812 * @param get_path NULL-terminated array of pointers
813 * to the peers on reverse GET path (or NULL if not recorded)
814 * @param put_path NULL-terminated array of pointers
815 * to the peers on the PUT path (or NULL if not recorded)
816 * @param type type of the result
817 * @param size number of bytes in data
818 * @param data pointer to the result data
821 handle_dht_reply (void *cls,
822 struct GNUNET_TIME_Absolute exp,
823 const GNUNET_HashCode *key,
824 const struct GNUNET_PeerIdentity * const *get_path,
825 const struct GNUNET_PeerIdentity * const *put_path,
826 enum GNUNET_BLOCK_Type type,
830 struct GSF_PendingRequest *pr = cls;
831 struct ProcessReplyClosure prq;
832 struct GNUNET_TIME_Absolute *start;
834 memset (&prq, 0, sizeof (prq));
836 prq.expiration = exp;
839 process_reply (&prq, key, pr);
840 if ( (GNUNET_YES == active_to_migration) &&
841 (GNUNET_NO == test_put_load_too_high (prq.priority)) )
844 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
845 "Replicating result for query `%s' with priority %u\n",
849 start = GNUNET_malloc (sizeof (struct GNUNET_TIME_Absolute));
850 *start = GNUNET_TIME_absolute_get ();
851 GNUNET_DATASTORE_put (GSF_dsh,
853 type, prq.priority, 1 /* anonymity */,
855 1 + prq.priority, MAX_DATASTORE_QUEUE,
856 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
857 &put_migration_continuation,
864 * Consider looking up the data in the DHT (anonymity-level permitting).
866 * @param pr the pending request to process
869 GSF_dht_lookup_ (struct GSF_PendingRequest *pr)
873 struct GNUNET_PeerIdentity pi;
874 char buf[sizeof (GNUNET_HashCode) * 2];
876 if (0 != pr->public_data.anonymity_level)
880 GNUNET_DHT_get_stop (pr->gh);
885 if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
888 memcpy (buf, &pr->public_data.namespace, sizeof (GNUNET_HashCode));
889 xquery_size = sizeof (GNUNET_HashCode);
891 if (0 != (pr->public_data.options & GSF_PRO_FORWARD_ONLY))
893 GNUNET_PEER_resolve (pr->sender_pid,
895 memcpy (&buf[xquery_size], &pi, sizeof (struct GNUNET_PeerIdentity));
896 xquery_size += sizeof (struct GNUNET_PeerIdentity);
898 pr->gh = GNUNET_DHT_get_start (GSF_dht,
899 GNUNET_TIME_UNIT_FOREVER_REL,
900 pr->public_data.type,
901 &pr->public_data.query,
902 DEFAULT_GET_REPLICATION,
903 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
914 * We're processing (local) results for a search request
915 * from another peer. Pass applicable results to the
916 * peer and if we are done either clean up (operation
917 * complete) or forward to other peers (more results possible).
919 * @param cls our closure (struct LocalGetContext)
920 * @param key key for the content
921 * @param size number of bytes in data
922 * @param data content stored
923 * @param type type of the content
924 * @param priority priority of the content
925 * @param anonymity anonymity-level for the content
926 * @param expiration expiration time for the content
927 * @param uid unique identifier for the datum;
928 * maybe 0 if no unique identifier is available
931 process_local_reply (void *cls,
932 const GNUNET_HashCode * key,
935 enum GNUNET_BLOCK_Type type,
938 struct GNUNET_TIME_Absolute expiration,
942 struct PendingRequest *pr = cls;
943 struct ProcessReplyClosure prq;
944 struct CheckDuplicateRequestClosure cdrc;
945 GNUNET_HashCode query;
951 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
952 "Done processing local replies, forwarding request to other peers.\n");
955 if (pr->client_request_list != NULL)
957 GNUNET_SERVER_receive_done (pr->client_request_list->client_list->client,
959 /* Figure out if this is a duplicate request and possibly
960 merge 'struct PendingRequest' entries */
963 GNUNET_CONTAINER_multihashmap_get_multiple (query_request_map,
965 &check_duplicate_request_client,
967 if (cdrc.have != NULL)
970 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
971 "Received request for block `%s' twice from client, will only request once.\n",
972 GNUNET_h2s (&pr->query));
975 destroy_pending_request (pr);
979 if (pr->local_only == GNUNET_YES)
981 destroy_pending_request (pr);
984 /* no more results */
985 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
986 pr->task = GNUNET_SCHEDULER_add_now (&forward_request_task,
991 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
992 "New local response to `%s' of type %u.\n",
996 if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
999 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1000 "Found ONDEMAND block, performing on-demand encoding\n");
1002 GNUNET_STATISTICS_update (stats,
1003 gettext_noop ("# on-demand blocks matched requests"),
1007 GNUNET_FS_handle_on_demand_block (key, size, data, type, priority,
1008 anonymity, expiration, uid,
1009 &process_local_reply,
1013 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
1017 old_rf = pr->results_found;
1018 memset (&prq, 0, sizeof (prq));
1020 prq.expiration = expiration;
1023 GNUNET_BLOCK_get_key (block_ctx,
1030 GNUNET_DATASTORE_remove (dsh,
1034 GNUNET_TIME_UNIT_FOREVER_REL,
1036 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
1040 prq.priority = priority;
1041 prq.finished = GNUNET_NO;
1042 prq.request_found = GNUNET_NO;
1043 prq.anonymity_level = anonymity;
1044 if ( (old_rf == 0) &&
1045 (pr->results_found == 0) )
1046 update_datastore_delays (pr->start_time);
1047 process_reply (&prq, key, pr);
1048 if (prq.finished == GNUNET_YES)
1051 return; /* done here */
1052 if (prq.eval == GNUNET_BLOCK_EVALUATION_OK_LAST)
1054 pr->local_only = GNUNET_YES; /* do not forward */
1055 GNUNET_DATASTORE_get_next (dsh, GNUNET_NO);
1058 if ( (pr->client_request_list == NULL) &&
1059 ( (GNUNET_YES == test_get_load_too_high (0)) ||
1060 (pr->results_found > 5 + 2 * pr->priority) ) )
1063 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1064 "Load too high, done with request\n");
1066 GNUNET_STATISTICS_update (stats,
1067 gettext_noop ("# processing result set cut short due to load"),
1070 GNUNET_DATASTORE_get_next (dsh, GNUNET_NO);
1073 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
1079 * Look up the request in the local datastore.
1081 * @param pr the pending request to process
1082 * @param cont function to call at the end
1083 * @param cont_cls closure for cont
1086 GSF_local_lookup_ (struct GSF_PendingRequest *pr,
1087 GSF_LocalLookupContinuation cont,
1090 // FIXME: fix process_local_reply / cont!
1091 GNUNET_assert (NULL == pr->gh);
1092 pr->qe = GNUNET_DATASTORE_get (GSF_dsh,
1093 &pr->public_data.query,
1094 pr->public_data.type,
1095 1 /* queue priority */,
1096 1 /* max queue size */,
1097 GNUNET_TIME_UNIT_FOREVER_REL,
1098 &process_local_reply,
1105 * Handle P2P "CONTENT" message. Checks that the message is
1106 * well-formed and then checks if there are any pending requests for
1107 * this content and possibly passes it on (to local clients or other
1108 * peers). Does NOT perform migration (content caching at this peer).
1110 * @param cp the other peer involved (sender or receiver, NULL
1111 * for loopback messages where we are both sender and receiver)
1112 * @param message the actual message
1113 * @return GNUNET_OK if the message was well-formed,
1114 * GNUNET_SYSERR if the message was malformed (close connection,
1115 * do not cache under any circumstances)
1118 GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
1119 const struct GNUNET_MessageHeader *message)
1121 const struct PutMessage *put;
1124 enum GNUNET_BLOCK_Type type;
1125 struct GNUNET_TIME_Absolute expiration;
1126 GNUNET_HashCode query;
1127 struct ProcessReplyClosure prq;
1128 struct GNUNET_TIME_Relative block_time;
1130 struct GNUNET_TIME_Absolute *start;
1132 msize = ntohs (message->size);
1133 if (msize < sizeof (struct PutMessage))
1136 return GNUNET_SYSERR;
1138 put = (const struct PutMessage*) message;
1139 dsize = msize - sizeof (struct PutMessage);
1140 type = ntohl (put->type);
1141 expiration = GNUNET_TIME_absolute_ntoh (put->expiration);
1142 if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
1143 return GNUNET_SYSERR;
1145 GNUNET_BLOCK_get_key (GSF_block_ctx,
1151 GNUNET_break_op (0);
1152 return GNUNET_SYSERR;
1154 /* now, lookup 'query' */
1155 prq.data = (const void*) &put[1];
1162 prq.expiration = expiration;
1164 prq.anonymity_level = 1;
1165 prq.finished = GNUNET_NO;
1166 prq.request_found = GNUNET_NO;
1167 GNUNET_CONTAINER_multihashmap_get_multiple (pr_map,
1173 GSF_connected_peer_change_preference_ (cp, CONTENT_BANDWIDTH_VALUE + 1000 * prq.priority);
1174 GSF_get_peer_performance_data_ (cp)->trust += prq.priority;
1176 if ( (GNUNET_YES == active_to_migration) &&
1177 (GNUNET_NO == test_put_load_too_high (prq.priority)) )
1180 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1181 "Replicating result for query `%s' with priority %u\n",
1182 GNUNET_h2s (&query),
1185 start = GNUNET_malloc (sizeof (struct GNUNET_TIME_Absolute));
1186 *start = GNUNET_TIME_absolute_get ();
1187 GNUNET_DATASTORE_put (GSF_dsh,
1188 0, &query, dsize, &put[1],
1189 type, prq.priority, 1 /* anonymity */,
1191 1 + prq.priority, MAX_DATASTORE_QUEUE,
1192 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1193 &put_migration_continuation,
1196 putl = GNUNET_LOAD_get_load (datastore_put_load);
1197 if ( (NULL != (cp = prq.sender)) &&
1198 (GNUNET_NO == prq.request_found) &&
1199 ( (GNUNET_YES != active_to_migration) ||
1200 (putl > 2.5 * (1 + prq.priority)) ) )
1202 if (GNUNET_YES != active_to_migration)
1203 putl = 1.0 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 5);
1204 block_time = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
1205 5000 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1206 (unsigned int) (60000 * putl * putl)));
1207 GSF_block_peer_migration_ (cp, block_time);
1214 * Setup the subsystem.
1217 GSF_pending_request_init_ ()
1220 GNUNET_CONFIGURATION_get_value_number (GSF_cfg,
1222 "MAX_PENDING_REQUESTS",
1223 &max_pending_requests))
1225 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1226 _("Configuration fails to specify `%s', assuming default value."),
1227 "MAX_PENDING_REQUESTS");
1229 pr_map = GNUNET_CONTAINER_multihashmap_create (32 * 1024);
1230 requests_by_expiration_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1235 * Shutdown the subsystem.
1238 GSF_pending_request_done_ ()
1240 GNUNET_CONTAINER_multihashmap_iterate (pr_map,
1243 GNUNET_CONTAINER_multihashmap_destroy (pr_map);
1245 GNUNET_CONTAINER_heap_destroy (requests_by_expiration_heap);
1246 requests_by_expiration_heap = NULL;
1250 /* end of gnunet-service-fs_pr.c */