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1/*
2 This file is part of GNUnet.
3 Copyright (C) 2009-2013 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
9
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 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20
21/**
22 * @file fs/gnunet-service-fs_pr.c
23 * @brief API to handle pending requests
24 * @author Christian Grothoff
25 */
26#include "platform.h"
27#include "gnunet_util_lib.h"
28#include "gnunet_load_lib.h"
29#include "gnunet-service-fs.h"
30#include "gnunet-service-fs_cp.h"
31#include "gnunet-service-fs_indexing.h"
32#include "gnunet-service-fs_pe.h"
33#include "gnunet-service-fs_pr.h"
34#include "gnunet-service-fs_cadet.h"
35
36
37/**
38 * Desired replication level for GETs.
39 */
40#define DHT_GET_REPLICATION 5
41
42/**
43 * Maximum size of the datastore queue for P2P operations. Needs to
44 * be large enough to queue #MAX_QUEUE_PER_PEER operations for roughly
45 * the number of active (connected) peers.
46 */
47#define MAX_DATASTORE_QUEUE (16 * MAX_QUEUE_PER_PEER)
48
49/**
50 * Bandwidth value of a 0-priority content (must be fairly high
51 * compared to query since content is typically significantly larger
52 * -- and more valuable since it can take many queries to get one
53 * piece of content).
54 */
55#define CONTENT_BANDWIDTH_VALUE 800
56
57/**
58 * Hard limit on the number of results we may get from the datastore per query.
59 */
60#define MAX_RESULTS (100 * 1024)
61
62/**
63 * Collect an instance number of statistics? May cause excessive IPC.
64 */
65#define INSANE_STATISTICS GNUNET_NO
66
67/**
68 * If obtaining a block via cadet fails, how often do we retry it before
69 * giving up for good (and sticking to non-anonymous transfer)?
70 */
71#define CADET_RETRY_MAX 3
72
73
74/**
75 * An active request.
76 */
77struct GSF_PendingRequest
78{
79 /**
80 * Public data for the request.
81 */
82 struct GSF_PendingRequestData public_data;
83
84 /**
85 * Function to call if we encounter a reply.
86 */
87 GSF_PendingRequestReplyHandler rh;
88
89 /**
90 * Closure for @e rh
91 */
92 void *rh_cls;
93
94 /**
95 * Array of hash codes of replies we've already seen.
96 */
97 struct GNUNET_HashCode *replies_seen;
98
99 /**
100 * Block group for filtering replies we've already seen.
101 */
102 struct GNUNET_BLOCK_Group *bg;
103
104 /**
105 * Entry for this pending request in the expiration heap, or NULL.
106 */
107 struct GNUNET_CONTAINER_HeapNode *hnode;
108
109 /**
110 * Datastore queue entry for this request (or NULL for none).
111 */
112 struct GNUNET_DATASTORE_QueueEntry *qe;
113
114 /**
115 * DHT request handle for this request (or NULL for none).
116 */
117 struct GNUNET_DHT_GetHandle *gh;
118
119 /**
120 * Cadet request handle for this request (or NULL for none).
121 */
122 struct GSF_CadetRequest *cadet_request;
123
124 /**
125 * Function to call upon completion of the local get
126 * request, or NULL for none.
127 */
128 GSF_LocalLookupContinuation llc_cont;
129
130 /**
131 * Closure for @e llc_cont.
132 */
133 void *llc_cont_cls;
134
135 /**
136 * Last result from the local datastore lookup evaluation.
137 */
138 enum GNUNET_BLOCK_EvaluationResult local_result;
139
140 /**
141 * Identity of the peer that we should use for the 'sender'
142 * (recipient of the response) when forwarding (0 for none).
143 */
144 GNUNET_PEER_Id sender_pid;
145
146 /**
147 * Identity of the peer that we should never forward this query
148 * to since it originated this query (0 for none).
149 */
150 GNUNET_PEER_Id origin_pid;
151
152 /**
153 * Time we started the last datastore lookup.
154 */
155 struct GNUNET_TIME_Absolute qe_start;
156
157 /**
158 * Task that warns us if the local datastore lookup takes too long.
159 */
160 struct GNUNET_SCHEDULER_Task *warn_task;
161
162 /**
163 * Do we have a first UID yet?
164 */
165 bool have_first_uid;
166
167 /**
168 * Have we seen a NULL result yet?
169 */
170 bool seen_null;
171
172 /**
173 * Unique ID of the first result from the local datastore;
174 * used to terminate the loop.
175 */
176 uint64_t first_uid;
177
178 /**
179 * Result count.
180 */
181 size_t result_count;
182
183 /**
184 * How often have we retried this request via 'cadet'?
185 * (used to bound overall retries).
186 */
187 unsigned int cadet_retry_count;
188
189 /**
190 * Number of valid entries in the 'replies_seen' array.
191 */
192 unsigned int replies_seen_count;
193
194 /**
195 * Length of the 'replies_seen' array.
196 */
197 unsigned int replies_seen_size;
198};
199
200
201/**
202 * All pending requests, ordered by the query. Entries
203 * are of type 'struct GSF_PendingRequest*'.
204 */
205static struct GNUNET_CONTAINER_MultiHashMap *pr_map;
206
207
208/**
209 * Datastore 'PUT' load tracking.
210 */
211static struct GNUNET_LOAD_Value *datastore_put_load;
212
213
214/**
215 * Are we allowed to migrate content to this peer.
216 */
217static int active_to_migration;
218
219
220/**
221 * Heap with the request that will expire next at the top. Contains
222 * pointers of type "struct PendingRequest*"; these will *also* be
223 * aliased from the "requests_by_peer" data structures and the
224 * "requests_by_query" table. Note that requests from our clients
225 * don't expire and are thus NOT in the "requests_by_expiration"
226 * (or the "requests_by_peer" tables).
227 */
228static struct GNUNET_CONTAINER_Heap *requests_by_expiration_heap;
229
230
231/**
232 * Maximum number of requests (from other peers, overall) that we're
233 * willing to have pending at any given point in time. Can be changed
234 * via the configuration file (32k is just the default).
235 */
236static unsigned long long max_pending_requests = (32 * 1024);
237
238
239/**
240 * Recalculate our bloom filter for filtering replies. This function
241 * will create a new bloom filter from scratch, so it should only be
242 * called if we have no bloomfilter at all (and hence can create a
243 * fresh one of minimal size without problems) OR if our peer is the
244 * initiator (in which case we may resize to larger than minimum size).
245 *
246 * @param type type of the request
247 * @param pr request for which the BF is to be recomputed
248 */
249static void
250refresh_bloomfilter (enum GNUNET_BLOCK_Type type, struct GSF_PendingRequest *pr)
251{
252 if (NULL != pr->bg)
253 {
254 GNUNET_BLOCK_group_destroy (pr->bg);
255 pr->bg = NULL;
256 }
257 if (GNUNET_BLOCK_TYPE_FS_UBLOCK != type)
258 return; /* no need */
259 pr->bg =
260 GNUNET_BLOCK_group_create (GSF_block_ctx,
261 type,
262 GNUNET_CRYPTO_random_u32 (
263 GNUNET_CRYPTO_QUALITY_WEAK,
264 UINT32_MAX),
265 NULL,
266 0,
267 "seen-set-size",
268 pr->replies_seen_count,
269 NULL);
270 if (NULL == pr->bg)
271 return;
272 GNUNET_break (GNUNET_OK ==
273 GNUNET_BLOCK_group_set_seen (pr->bg,
274 pr->replies_seen,
275 pr->replies_seen_count));
276}
277
278
279/**
280 * Create a new pending request.
281 *
282 * @param options request options
283 * @param type type of the block that is being requested
284 * @param query key for the lookup
285 * @param target preferred target for the request, NULL for none
286 * @param bf_data raw data for bloom filter for known replies, can be NULL
287 * @param bf_size number of bytes in @a bf_data
288 * @param mingle mingle value for bf
289 * @param anonymity_level desired anonymity level
290 * @param priority maximum outgoing cumulative request priority to use
291 * @param ttl current time-to-live for the request
292 * @param sender_pid peer ID to use for the sender when forwarding, 0 for none
293 * @param origin_pid peer ID of origin of query (do not loop back)
294 * @param replies_seen hash codes of known local replies
295 * @param replies_seen_count size of the @a replies_seen array
296 * @param rh handle to call when we get a reply
297 * @param rh_cls closure for @a rh
298 * @return handle for the new pending request
299 */
300struct GSF_PendingRequest *
301GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
302 enum GNUNET_BLOCK_Type type,
303 const struct GNUNET_HashCode *query,
304 const struct GNUNET_PeerIdentity *target,
305 const char *bf_data,
306 size_t bf_size,
307 uint32_t mingle,
308 uint32_t anonymity_level,
309 uint32_t priority,
310 int32_t ttl,
311 GNUNET_PEER_Id sender_pid,
312 GNUNET_PEER_Id origin_pid,
313 const struct GNUNET_HashCode *replies_seen,
314 unsigned int replies_seen_count,
315 GSF_PendingRequestReplyHandler rh,
316 void *rh_cls)
317{
318 struct GSF_PendingRequest *pr;
319 struct GSF_PendingRequest *dpr;
320 size_t extra;
321 struct GNUNET_HashCode *eptr;
322
323 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
324 "Creating request handle for `%s' of type %d\n",
325 GNUNET_h2s (query),
326 type);
327#if INSANE_STATISTICS
328 GNUNET_STATISTICS_update (GSF_stats,
329 gettext_noop ("# Pending requests created"),
330 1,
331 GNUNET_NO);
332#endif
333 extra = 0;
334 if (NULL != target)
335 extra += sizeof(struct GNUNET_PeerIdentity);
336 pr = GNUNET_malloc (sizeof(struct GSF_PendingRequest) + extra);
337 pr->public_data.query = *query;
338 eptr = (struct GNUNET_HashCode *) &pr[1];
339 if (NULL != target)
340 {
341 pr->public_data.target = (struct GNUNET_PeerIdentity *) eptr;
342 GNUNET_memcpy (eptr, target, sizeof(struct GNUNET_PeerIdentity));
343 }
344 pr->public_data.anonymity_level = anonymity_level;
345 pr->public_data.priority = priority;
346 pr->public_data.original_priority = priority;
347 pr->public_data.options = options;
348 pr->public_data.type = type;
349 pr->public_data.start_time = GNUNET_TIME_absolute_get ();
350 pr->sender_pid = sender_pid;
351 pr->origin_pid = origin_pid;
352 pr->rh = rh;
353 pr->rh_cls = rh_cls;
354 GNUNET_assert ((sender_pid != 0) || (0 == (options & GSF_PRO_FORWARD_ONLY)));
355 if (ttl >= 0)
356 pr->public_data.ttl = GNUNET_TIME_relative_to_absolute (
357 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, (uint32_t) ttl));
358 else
359 pr->public_data.ttl = GNUNET_TIME_absolute_subtract (
360 pr->public_data.start_time,
361 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
362 (uint32_t) (-ttl)));
363 if (replies_seen_count > 0)
364 {
365 pr->replies_seen_size = replies_seen_count;
366 pr->replies_seen =
367 GNUNET_new_array (pr->replies_seen_size, struct GNUNET_HashCode);
368 GNUNET_memcpy (pr->replies_seen,
369 replies_seen,
370 replies_seen_count * sizeof(struct GNUNET_HashCode));
371 pr->replies_seen_count = replies_seen_count;
372 }
373 if ((NULL != bf_data) &&
374 (GNUNET_BLOCK_TYPE_FS_UBLOCK == pr->public_data.type))
375 {
376 pr->bg = GNUNET_BLOCK_group_create (GSF_block_ctx,
377 pr->public_data.type,
378 mingle,
379 bf_data,
380 bf_size,
381 "seen-set-size",
382 0,
383 NULL);
384 }
385 else if ((replies_seen_count > 0) &&
386 (0 != (options & GSF_PRO_BLOOMFILTER_FULL_REFRESH)))
387 {
388 refresh_bloomfilter (pr->public_data.type, pr);
389 }
390 GNUNET_CONTAINER_multihashmap_put (pr_map,
391 &pr->public_data.query,
392 pr,
393 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
394 if (0 == (options & GSF_PRO_REQUEST_NEVER_EXPIRES))
395 {
396 pr->hnode = GNUNET_CONTAINER_heap_insert (requests_by_expiration_heap,
397 pr,
398 pr->public_data.ttl.abs_value_us);
399 /* make sure we don't track too many requests */
400 while (GNUNET_CONTAINER_heap_get_size (requests_by_expiration_heap) >
401 max_pending_requests)
402 {
403 dpr = GNUNET_CONTAINER_heap_peek (requests_by_expiration_heap);
404 GNUNET_assert (NULL != dpr);
405 if (pr == dpr)
406 break; /* let the request live briefly... */
407 if (NULL != dpr->rh)
408 dpr->rh (dpr->rh_cls,
409 GNUNET_BLOCK_EVALUATION_REQUEST_VALID,
410 dpr,
411 UINT32_MAX,
412 GNUNET_TIME_UNIT_FOREVER_ABS,
413 GNUNET_TIME_UNIT_FOREVER_ABS,
414 GNUNET_BLOCK_TYPE_ANY,
415 NULL,
416 0);
417 GSF_pending_request_cancel_ (dpr, GNUNET_YES);
418 }
419 }
420 GNUNET_STATISTICS_update (GSF_stats,
421 gettext_noop ("# Pending requests active"),
422 1,
423 GNUNET_NO);
424 return pr;
425}
426
427
428/**
429 * Obtain the public data associated with a pending request
430 *
431 * @param pr pending request
432 * @return associated public data
433 */
434struct GSF_PendingRequestData *
435GSF_pending_request_get_data_ (struct GSF_PendingRequest *pr)
436{
437 return &pr->public_data;
438}
439
440
441/**
442 * Test if two pending requests are compatible (would generate
443 * the same query modulo filters and should thus be processed
444 * jointly).
445 *
446 * @param pra a pending request
447 * @param prb another pending request
448 * @return #GNUNET_OK if the requests are compatible
449 */
450int
451GSF_pending_request_is_compatible_ (struct GSF_PendingRequest *pra,
452 struct GSF_PendingRequest *prb)
453{
454 if ((pra->public_data.type != prb->public_data.type) ||
455 (0 != memcmp (&pra->public_data.query,
456 &prb->public_data.query,
457 sizeof(struct GNUNET_HashCode))))
458 return GNUNET_NO;
459 return GNUNET_OK;
460}
461
462
463/**
464 * Update a given pending request with additional replies
465 * that have been seen.
466 *
467 * @param pr request to update
468 * @param replies_seen hash codes of replies that we've seen
469 * @param replies_seen_count size of the replies_seen array
470 */
471void
472GSF_pending_request_update_ (struct GSF_PendingRequest *pr,
473 const struct GNUNET_HashCode *replies_seen,
474 unsigned int replies_seen_count)
475{
476 if (replies_seen_count + pr->replies_seen_count < pr->replies_seen_count)
477 return; /* integer overflow */
478 if (0 != (pr->public_data.options & GSF_PRO_BLOOMFILTER_FULL_REFRESH))
479 {
480 /* we're responsible for the BF, full refresh */
481 if (replies_seen_count + pr->replies_seen_count > pr->replies_seen_size)
482 GNUNET_array_grow (pr->replies_seen,
483 pr->replies_seen_size,
484 replies_seen_count + pr->replies_seen_count);
485 GNUNET_memcpy (&pr->replies_seen[pr->replies_seen_count],
486 replies_seen,
487 sizeof(struct GNUNET_HashCode) * replies_seen_count);
488 pr->replies_seen_count += replies_seen_count;
489 refresh_bloomfilter (pr->public_data.type, pr);
490 }
491 else
492 {
493 if (NULL == pr->bg)
494 {
495 /* we're not the initiator, but the initiator did not give us
496 * any bloom-filter, so we need to create one on-the-fly */
497 refresh_bloomfilter (pr->public_data.type, pr);
498 }
499 else
500 {
501 GNUNET_break (GNUNET_OK ==
502 GNUNET_BLOCK_group_set_seen (pr->bg,
503 replies_seen,
504 pr->replies_seen_count));
505 }
506 }
507 if (NULL != pr->gh)
508 GNUNET_DHT_get_filter_known_results (pr->gh,
509 replies_seen_count,
510 replies_seen);
511}
512
513
514/**
515 * Generate the message corresponding to the given pending request for
516 * transmission to other peers.
517 *
518 * @param pr request to generate the message for
519 * @return envelope with the request message
520 */
521struct GNUNET_MQ_Envelope *
522GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr)
523{
524 struct GNUNET_MQ_Envelope *env;
525 struct GetMessage *gm;
526 struct GNUNET_PeerIdentity *ext;
527 unsigned int k;
528 uint32_t bm;
529 uint32_t prio;
530 size_t bf_size;
531 struct GNUNET_TIME_Absolute now;
532 int64_t ttl;
533 int do_route;
534 void *bf_data;
535 uint32_t bf_nonce;
536
537 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
538 "Building request message for `%s' of type %d\n",
539 GNUNET_h2s (&pr->public_data.query),
540 pr->public_data.type);
541 k = 0;
542 bm = 0;
543 do_route = (0 == (pr->public_data.options & GSF_PRO_FORWARD_ONLY));
544 if ((! do_route) && (pr->sender_pid == 0))
545 {
546 GNUNET_break (0);
547 do_route = GNUNET_YES;
548 }
549 if (! do_route)
550 {
551 bm |= GET_MESSAGE_BIT_RETURN_TO;
552 k++;
553 }
554 if (NULL != pr->public_data.target)
555 {
556 bm |= GET_MESSAGE_BIT_TRANSMIT_TO;
557 k++;
558 }
559 if (GNUNET_OK !=
560 GNUNET_BLOCK_group_serialize (pr->bg, &bf_nonce, &bf_data, &bf_size))
561 {
562 bf_size = 0;
563 bf_data = NULL;
564 }
565 env = GNUNET_MQ_msg_extra (gm,
566 bf_size + k * sizeof(struct GNUNET_PeerIdentity),
567 GNUNET_MESSAGE_TYPE_FS_GET);
568 gm->type = htonl (pr->public_data.type);
569 if (do_route)
570 prio = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
571 pr->public_data.priority + 1);
572 else
573 prio = 0;
574 pr->public_data.priority -= prio;
575 pr->public_data.num_transmissions++;
576 pr->public_data.respect_offered += prio;
577 gm->priority = htonl (prio);
578 now = GNUNET_TIME_absolute_get ();
579 ttl = (int64_t) (pr->public_data.ttl.abs_value_us - now.abs_value_us);
580 gm->ttl = htonl (ttl / 1000LL / 1000LL);
581 gm->filter_mutator = htonl (bf_nonce);
582 gm->hash_bitmap = htonl (bm);
583 gm->query = pr->public_data.query;
584 ext = (struct GNUNET_PeerIdentity *) &gm[1];
585 k = 0;
586 if (! do_route)
587 GNUNET_PEER_resolve (pr->sender_pid, &ext[k++]);
588 if (NULL != pr->public_data.target)
589 ext[k++] = *pr->public_data.target;
590 GNUNET_memcpy (&ext[k], bf_data, bf_size);
591 GNUNET_free (bf_data);
592 return env;
593}
594
595
596/**
597 * Iterator to free pending requests.
598 *
599 * @param cls closure, unused
600 * @param key current key code
601 * @param value value in the hash map (pending request)
602 * @return #GNUNET_YES (we should continue to iterate)
603 */
604static int
605clean_request (void *cls, const struct GNUNET_HashCode *key, void *value)
606{
607 struct GSF_PendingRequest *pr = value;
608 GSF_LocalLookupContinuation cont;
609
610 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
611 "Cleaning up pending request for `%s'.\n",
612 GNUNET_h2s (key));
613 if (NULL != pr->cadet_request)
614 {
615 pr->cadet_retry_count = CADET_RETRY_MAX;
616 GSF_cadet_query_cancel (pr->cadet_request);
617 pr->cadet_request = NULL;
618 }
619 if (NULL != (cont = pr->llc_cont))
620 {
621 pr->llc_cont = NULL;
622 cont (pr->llc_cont_cls, pr, pr->local_result);
623 }
624 GSF_plan_notify_request_done_ (pr);
625 GNUNET_free (pr->replies_seen);
626 GNUNET_BLOCK_group_destroy (pr->bg);
627 pr->bg = NULL;
628 GNUNET_PEER_change_rc (pr->sender_pid, -1);
629 pr->sender_pid = 0;
630 GNUNET_PEER_change_rc (pr->origin_pid, -1);
631 pr->origin_pid = 0;
632 if (NULL != pr->hnode)
633 {
634 GNUNET_CONTAINER_heap_remove_node (pr->hnode);
635 pr->hnode = NULL;
636 }
637 if (NULL != pr->qe)
638 {
639 GNUNET_DATASTORE_cancel (pr->qe);
640 pr->qe = NULL;
641 }
642 if (NULL != pr->gh)
643 {
644 GNUNET_DHT_get_stop (pr->gh);
645 pr->gh = NULL;
646 }
647 if (NULL != pr->warn_task)
648 {
649 GNUNET_SCHEDULER_cancel (pr->warn_task);
650 pr->warn_task = NULL;
651 }
652 GNUNET_assert (
653 GNUNET_OK ==
654 GNUNET_CONTAINER_multihashmap_remove (pr_map, &pr->public_data.query, pr));
655 GNUNET_STATISTICS_update (GSF_stats,
656 gettext_noop ("# Pending requests active"),
657 -1,
658 GNUNET_NO);
659 GNUNET_free (pr);
660 return GNUNET_YES;
661}
662
663
664/**
665 * Explicitly cancel a pending request.
666 *
667 * @param pr request to cancel
668 * @param full_cleanup fully purge the request
669 */
670void
671GSF_pending_request_cancel_ (struct GSF_PendingRequest *pr, int full_cleanup)
672{
673 GSF_LocalLookupContinuation cont;
674
675 if (NULL == pr_map)
676 return; /* already cleaned up! */
677 if (GNUNET_NO == full_cleanup)
678 {
679 /* make request inactive (we're no longer interested in more results),
680 * but do NOT remove from our data-structures, we still need it there
681 * to prevent the request from looping */
682 pr->rh = NULL;
683 if (NULL != pr->cadet_request)
684 {
685 pr->cadet_retry_count = CADET_RETRY_MAX;
686 GSF_cadet_query_cancel (pr->cadet_request);
687 pr->cadet_request = NULL;
688 }
689 if (NULL != (cont = pr->llc_cont))
690 {
691 pr->llc_cont = NULL;
692 cont (pr->llc_cont_cls, pr, pr->local_result);
693 }
694 GSF_plan_notify_request_done_ (pr);
695 if (NULL != pr->qe)
696 {
697 GNUNET_DATASTORE_cancel (pr->qe);
698 pr->qe = NULL;
699 }
700 if (NULL != pr->gh)
701 {
702 GNUNET_DHT_get_stop (pr->gh);
703 pr->gh = NULL;
704 }
705 if (NULL != pr->warn_task)
706 {
707 GNUNET_SCHEDULER_cancel (pr->warn_task);
708 pr->warn_task = NULL;
709 }
710 return;
711 }
712 GNUNET_assert (GNUNET_YES ==
713 clean_request (NULL, &pr->public_data.query, pr));
714}
715
716
717/**
718 * Iterate over all pending requests.
719 *
720 * @param it function to call for each request
721 * @param cls closure for @a it
722 */
723void
724GSF_iterate_pending_requests_ (GSF_PendingRequestIterator it, void *cls)
725{
726 GNUNET_CONTAINER_multihashmap_iterate (
727 pr_map,
728 (GNUNET_CONTAINER_MulitHashMapIteratorCallback) it,
729 cls);
730}
731
732
733/**
734 * Closure for process_reply() function.
735 */
736struct ProcessReplyClosure
737{
738 /**
739 * The data for the reply.
740 */
741 const void *data;
742
743 /**
744 * Who gave us this reply? NULL for local host (or DHT)
745 */
746 struct GSF_ConnectedPeer *sender;
747
748 /**
749 * When the reply expires.
750 */
751 struct GNUNET_TIME_Absolute expiration;
752
753 /**
754 * Size of data.
755 */
756 size_t size;
757
758 /**
759 * Type of the block.
760 */
761 enum GNUNET_BLOCK_Type type;
762
763 /**
764 * Control flags for evaluation.
765 */
766 enum GNUNET_BLOCK_EvaluationOptions eo;
767
768 /**
769 * How much was this reply worth to us?
770 */
771 uint32_t priority;
772
773 /**
774 * Anonymity requirements for this reply.
775 */
776 uint32_t anonymity_level;
777
778 /**
779 * Evaluation result (returned).
780 */
781 enum GNUNET_BLOCK_EvaluationResult eval;
782
783 /**
784 * Did we find a matching request?
785 */
786 int request_found;
787};
788
789
790/**
791 * Update the performance data for the sender (if any) since
792 * the sender successfully answered one of our queries.
793 *
794 * @param prq information about the sender
795 * @param pr request that was satisfied
796 */
797static void
798update_request_performance_data (struct ProcessReplyClosure *prq,
799 struct GSF_PendingRequest *pr)
800{
801 if (prq->sender == NULL)
802 return;
803 GSF_peer_update_performance_ (prq->sender,
804 pr->public_data.start_time,
805 prq->priority);
806}
807
808
809/**
810 * We have received a reply; handle it!
811 *
812 * @param cls response (a `struct ProcessReplyClosure`)
813 * @param key our query
814 * @param value value in the hash map (info about the query)
815 * @return #GNUNET_YES (we should continue to iterate)
816 */
817static int
818process_reply (void *cls, const struct GNUNET_HashCode *key, void *value)
819{
820 struct ProcessReplyClosure *prq = cls;
821 struct GSF_PendingRequest *pr = value;
822 struct GNUNET_HashCode chash;
823 struct GNUNET_TIME_Absolute last_transmission;
824
825 if (NULL == pr->rh)
826 return GNUNET_YES;
827 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
828 "Matched result (type %u) for query `%s' with pending request\n",
829 (unsigned int) prq->type,
830 GNUNET_h2s (key));
831 GNUNET_STATISTICS_update (GSF_stats,
832 gettext_noop ("# replies received and matched"),
833 1,
834 GNUNET_NO);
835 prq->eval = GNUNET_BLOCK_evaluate (GSF_block_ctx,
836 prq->type,
837 pr->bg,
838 prq->eo,
839 key,
840 NULL,
841 0,
842 prq->data,
843 prq->size);
844 switch (prq->eval)
845 {
846 case GNUNET_BLOCK_EVALUATION_OK_MORE:
847 update_request_performance_data (prq, pr);
848 break;
849
850 case GNUNET_BLOCK_EVALUATION_OK_LAST:
851 /* short cut: stop processing early, no BF-update, etc. */
852 update_request_performance_data (prq, pr);
853 GNUNET_LOAD_update (GSF_rt_entry_lifetime,
854 GNUNET_TIME_absolute_get_duration (
855 pr->public_data.start_time)
856 .rel_value_us);
857 if (GNUNET_YES !=
858 GSF_request_plan_reference_get_last_transmission_ (pr->public_data
859 .pr_head,
860 prq->sender,
861 &last_transmission))
862 last_transmission.abs_value_us =
863 GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us;
864 /* pass on to other peers / local clients */
865 pr->rh (pr->rh_cls,
866 prq->eval,
867 pr,
868 prq->anonymity_level,
869 prq->expiration,
870 last_transmission,
871 prq->type,
872 prq->data,
873 prq->size);
874 return GNUNET_YES;
875
876 case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
877#if INSANE_STATISTICS
878 GNUNET_STATISTICS_update (GSF_stats,
879 gettext_noop (
880 "# duplicate replies discarded (bloomfilter)"),
881 1,
882 GNUNET_NO);
883#endif
884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Duplicate response, discarding.\n");
885 return GNUNET_YES; /* duplicate */
886
887 case GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT:
888 GNUNET_STATISTICS_update (GSF_stats,
889 gettext_noop ("# irrelevant replies discarded"),
890 1,
891 GNUNET_NO);
892 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Irrelevant response, ignoring.\n");
893 return GNUNET_YES;
894
895 case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
896 return GNUNET_YES; /* wrong namespace */
897
898 case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
899 GNUNET_break (0);
900 return GNUNET_YES;
901
902 case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
903 GNUNET_break (0);
904 return GNUNET_YES;
905
906 case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
907 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
908 _ ("Unsupported block type %u\n"),
909 prq->type);
910 return GNUNET_NO;
911 }
912 /* update bloomfilter */
913 GNUNET_CRYPTO_hash (prq->data, prq->size, &chash);
914 GSF_pending_request_update_ (pr, &chash, 1);
915 if (NULL == prq->sender)
916 {
917 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
918 "Found result for query `%s' in local datastore\n",
919 GNUNET_h2s (key));
920 GNUNET_STATISTICS_update (GSF_stats,
921 gettext_noop ("# results found locally"),
922 1,
923 GNUNET_NO);
924 }
925 else
926 {
927 GSF_dht_lookup_ (pr);
928 }
929 prq->priority += pr->public_data.original_priority;
930 pr->public_data.priority = 0;
931 pr->public_data.original_priority = 0;
932 pr->public_data.results_found++;
933 prq->request_found = GNUNET_YES;
934 /* finally, pass on to other peer / local client */
935 if (! GSF_request_plan_reference_get_last_transmission_ (pr->public_data
936 .pr_head,
937 prq->sender,
938 &last_transmission))
939 last_transmission.abs_value_us = GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us;
940 pr->rh (pr->rh_cls,
941 prq->eval,
942 pr,
943 prq->anonymity_level,
944 prq->expiration,
945 last_transmission,
946 prq->type,
947 prq->data,
948 prq->size);
949 return GNUNET_YES;
950}
951
952
953/**
954 * Context for put_migration_continuation().
955 */
956struct PutMigrationContext
957{
958 /**
959 * Start time for the operation.
960 */
961 struct GNUNET_TIME_Absolute start;
962
963 /**
964 * Request origin.
965 */
966 struct GNUNET_PeerIdentity origin;
967
968 /**
969 * #GNUNET_YES if we had a matching request for this block,
970 * #GNUNET_NO if not.
971 */
972 int requested;
973};
974
975
976/**
977 * Continuation called to notify client about result of the
978 * operation.
979 *
980 * @param cls closure
981 * @param success #GNUNET_SYSERR on failure
982 * @param min_expiration minimum expiration time required for content to be stored
983 * @param msg NULL on success, otherwise an error message
984 */
985static void
986put_migration_continuation (void *cls,
987 int success,
988 struct GNUNET_TIME_Absolute min_expiration,
989 const char *msg)
990{
991 struct PutMigrationContext *pmc = cls;
992 struct GSF_ConnectedPeer *cp;
993 struct GNUNET_TIME_Relative mig_pause;
994 struct GSF_PeerPerformanceData *ppd;
995
996 if (NULL != datastore_put_load)
997 {
998 if (GNUNET_SYSERR != success)
999 {
1000 GNUNET_LOAD_update (datastore_put_load,
1001 GNUNET_TIME_absolute_get_duration (pmc->start)
1002 .rel_value_us);
1003 }
1004 else
1005 {
1006 /* on queue failure / timeout, increase the put load dramatically */
1007 GNUNET_LOAD_update (datastore_put_load,
1008 GNUNET_TIME_UNIT_MINUTES.rel_value_us);
1009 }
1010 }
1011 cp = GSF_peer_get_ (&pmc->origin);
1012 if (GNUNET_OK == success)
1013 {
1014 if (NULL != cp)
1015 {
1016 ppd = GSF_get_peer_performance_data_ (cp);
1017 ppd->migration_delay.rel_value_us /= 2;
1018 }
1019 GNUNET_free (pmc);
1020 return;
1021 }
1022 if ((GNUNET_NO == success) && (GNUNET_NO == pmc->requested) && (NULL != cp))
1023 {
1024 ppd = GSF_get_peer_performance_data_ (cp);
1025 if (min_expiration.abs_value_us > 0)
1026 {
1027 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1028 "Asking to stop migration for %s because datastore is full\n",
1029 GNUNET_STRINGS_relative_time_to_string (
1030 GNUNET_TIME_absolute_get_remaining (min_expiration),
1031 GNUNET_YES));
1032 GSF_block_peer_migration_ (cp, min_expiration);
1033 }
1034 else
1035 {
1036 ppd->migration_delay = GNUNET_TIME_relative_max (GNUNET_TIME_UNIT_SECONDS,
1037 ppd->migration_delay);
1038 ppd->migration_delay =
1039 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_HOURS, ppd->migration_delay);
1040 mig_pause.rel_value_us =
1041 GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
1042 ppd->migration_delay.rel_value_us);
1043 ppd->migration_delay =
1044 GNUNET_TIME_relative_saturating_multiply (ppd->migration_delay, 2);
1045 GNUNET_log (
1046 GNUNET_ERROR_TYPE_DEBUG,
1047 "Replicated content already exists locally, asking to stop migration for %s\n",
1048 GNUNET_STRINGS_relative_time_to_string (mig_pause, GNUNET_YES));
1049 GSF_block_peer_migration_ (cp,
1050 GNUNET_TIME_relative_to_absolute (mig_pause));
1051 }
1052 }
1053 GNUNET_free (pmc);
1054 GNUNET_STATISTICS_update (GSF_stats,
1055 gettext_noop ("# Datastore `PUT' failures"),
1056 1,
1057 GNUNET_NO);
1058}
1059
1060
1061/**
1062 * Test if the DATABASE (PUT) load on this peer is too high
1063 * to even consider processing the query at
1064 * all.
1065 *
1066 * @param priority the priority of the item
1067 * @return #GNUNET_YES if the load is too high to do anything (load high)
1068 * #GNUNET_NO to process normally (load normal or low)
1069 */
1070static int
1071test_put_load_too_high (uint32_t priority)
1072{
1073 double ld;
1074
1075 if (NULL == datastore_put_load)
1076 return GNUNET_NO;
1077 if (GNUNET_LOAD_get_average (datastore_put_load) < 50)
1078 return GNUNET_NO; /* very fast */
1079 ld = GNUNET_LOAD_get_load (datastore_put_load);
1080 if (ld < 2.0 * (1 + priority))
1081 return GNUNET_NO;
1082 GNUNET_STATISTICS_update (GSF_stats,
1083 gettext_noop (
1084 "# storage requests dropped due to high load"),
1085 1,
1086 GNUNET_NO);
1087 return GNUNET_YES;
1088}
1089
1090
1091/**
1092 * Iterator called on each result obtained for a DHT
1093 * operation that expects a reply
1094 *
1095 * @param cls closure
1096 * @param exp when will this value expire
1097 * @param key key of the result
1098 * @param get_path peers on reply path (or NULL if not recorded)
1099 * @param get_path_length number of entries in @a get_path
1100 * @param put_path peers on the PUT path (or NULL if not recorded)
1101 * @param put_path_length number of entries in @a get_path
1102 * @param type type of the result
1103 * @param size number of bytes in @a data
1104 * @param data pointer to the result data
1105 */
1106static void
1107handle_dht_reply (void *cls,
1108 struct GNUNET_TIME_Absolute exp,
1109 const struct GNUNET_HashCode *key,
1110 const struct GNUNET_PeerIdentity *get_path,
1111 unsigned int get_path_length,
1112 const struct GNUNET_PeerIdentity *put_path,
1113 unsigned int put_path_length,
1114 enum GNUNET_BLOCK_Type type,
1115 size_t size,
1116 const void *data)
1117{
1118 struct GSF_PendingRequest *pr = cls;
1119 struct ProcessReplyClosure prq;
1120 struct PutMigrationContext *pmc;
1121
1122 GNUNET_STATISTICS_update (GSF_stats,
1123 gettext_noop ("# Replies received from DHT"),
1124 1,
1125 GNUNET_NO);
1126 memset (&prq, 0, sizeof(prq));
1127 prq.data = data;
1128 prq.expiration = exp;
1129 /* do not allow migrated content to live longer than 1 year */
1130 prq.expiration = GNUNET_TIME_absolute_min (GNUNET_TIME_relative_to_absolute (
1131 GNUNET_TIME_UNIT_YEARS),
1132 prq.expiration);
1133 prq.size = size;
1134 prq.type = type;
1135 prq.eo = GNUNET_BLOCK_EO_NONE;
1136 process_reply (&prq, key, pr);
1137 if ((GNUNET_YES == active_to_migration) &&
1138 (GNUNET_NO == test_put_load_too_high (prq.priority)))
1139 {
1140 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1141 "Replicating result for query `%s' with priority %u\n",
1142 GNUNET_h2s (key),
1143 prq.priority);
1144 pmc = GNUNET_new (struct PutMigrationContext);
1145 pmc->start = GNUNET_TIME_absolute_get ();
1146 pmc->requested = GNUNET_YES;
1147 if (NULL == GNUNET_DATASTORE_put (GSF_dsh,
1148 0,
1149 key,
1150 size,
1151 data,
1152 type,
1153 prq.priority,
1154 1 /* anonymity */,
1155 0 /* replication */,
1156 exp,
1157 1 + prq.priority,
1158 MAX_DATASTORE_QUEUE,
1159 &put_migration_continuation,
1160 pmc))
1161 {
1162 put_migration_continuation (pmc,
1163 GNUNET_SYSERR,
1164 GNUNET_TIME_UNIT_ZERO_ABS,
1165 NULL);
1166 }
1167 }
1168}
1169
1170
1171/**
1172 * Consider looking up the data in the DHT (anonymity-level permitting).
1173 *
1174 * @param pr the pending request to process
1175 */
1176void
1177GSF_dht_lookup_ (struct GSF_PendingRequest *pr)
1178{
1179 const void *xquery;
1180 size_t xquery_size;
1181 struct GNUNET_PeerIdentity pi;
1182 char buf[sizeof(struct GNUNET_HashCode) * 2] GNUNET_ALIGN;
1183
1184 if (0 != pr->public_data.anonymity_level)
1185 return;
1186 if (NULL != pr->gh)
1187 {
1188 GNUNET_DHT_get_stop (pr->gh);
1189 pr->gh = NULL;
1190 }
1191 xquery = NULL;
1192 xquery_size = 0;
1193 if (0 != (pr->public_data.options & GSF_PRO_FORWARD_ONLY))
1194 {
1195 GNUNET_assert (0 != pr->sender_pid);
1196 GNUNET_PEER_resolve (pr->sender_pid, &pi);
1197 GNUNET_memcpy (&buf[xquery_size], &pi, sizeof(struct GNUNET_PeerIdentity));
1198 xquery_size += sizeof(struct GNUNET_PeerIdentity);
1199 }
1200 pr->gh = GNUNET_DHT_get_start (GSF_dht,
1201 pr->public_data.type,
1202 &pr->public_data.query,
1203 DHT_GET_REPLICATION,
1204 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
1205 xquery,
1206 xquery_size,
1207 &handle_dht_reply,
1208 pr);
1209 if ((NULL != pr->gh) && (0 != pr->replies_seen_count))
1210 GNUNET_DHT_get_filter_known_results (pr->gh,
1211 pr->replies_seen_count,
1212 pr->replies_seen);
1213}
1214
1215
1216/**
1217 * Function called with a reply from the cadet.
1218 *
1219 * @param cls the pending request struct
1220 * @param type type of the block, ANY on error
1221 * @param expiration expiration time for the block
1222 * @param data_size number of bytes in @a data, 0 on error
1223 * @param data reply block data, NULL on error
1224 */
1225static void
1226cadet_reply_proc (void *cls,
1227 enum GNUNET_BLOCK_Type type,
1228 struct GNUNET_TIME_Absolute expiration,
1229 size_t data_size,
1230 const void *data)
1231{
1232 struct GSF_PendingRequest *pr = cls;
1233 struct ProcessReplyClosure prq;
1234 struct GNUNET_HashCode query;
1235
1236 pr->cadet_request = NULL;
1237 if (GNUNET_BLOCK_TYPE_ANY == type)
1238 {
1239 GNUNET_break (NULL == data);
1240 GNUNET_break (0 == data_size);
1241 pr->cadet_retry_count++;
1242 if (pr->cadet_retry_count >= CADET_RETRY_MAX)
1243 return; /* give up on cadet */
1244 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Error retrieiving block via cadet\n");
1245 /* retry -- without delay, as this is non-anonymous
1246 and cadet/cadet connect will take some time anyway */
1247 pr->cadet_request = GSF_cadet_query (pr->public_data.target,
1248 &pr->public_data.query,
1249 pr->public_data.type,
1250 &cadet_reply_proc,
1251 pr);
1252 return;
1253 }
1254 if (GNUNET_YES !=
1255 GNUNET_BLOCK_get_key (GSF_block_ctx, type, data, data_size, &query))
1256 {
1257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1258 "Failed to derive key for block of type %d\n",
1259 (int) type);
1260 GNUNET_break_op (0);
1261 return;
1262 }
1263 GNUNET_STATISTICS_update (GSF_stats,
1264 gettext_noop ("# Replies received from CADET"),
1265 1,
1266 GNUNET_NO);
1267 memset (&prq, 0, sizeof(prq));
1268 prq.data = data;
1269 prq.expiration = expiration;
1270 /* do not allow migrated content to live longer than 1 year */
1271 prq.expiration = GNUNET_TIME_absolute_min (GNUNET_TIME_relative_to_absolute (
1272 GNUNET_TIME_UNIT_YEARS),
1273 prq.expiration);
1274 prq.size = data_size;
1275 prq.type = type;
1276 prq.eo = GNUNET_BLOCK_EO_NONE;
1277 process_reply (&prq, &query, pr);
1278}
1279
1280
1281/**
1282 * Consider downloading via cadet (if possible)
1283 *
1284 * @param pr the pending request to process
1285 */
1286void
1287GSF_cadet_lookup_ (struct GSF_PendingRequest *pr)
1288{
1289 if (0 != pr->public_data.anonymity_level)
1290 return;
1291 if (0 == pr->public_data.target)
1292 {
1293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1294 "Cannot do cadet-based download, target peer not known\n");
1295 return;
1296 }
1297 if (NULL != pr->cadet_request)
1298 return;
1299 pr->cadet_request = GSF_cadet_query (pr->public_data.target,
1300 &pr->public_data.query,
1301 pr->public_data.type,
1302 &cadet_reply_proc,
1303 pr);
1304}
1305
1306
1307/**
1308 * Task that issues a warning if the datastore lookup takes too long.
1309 *
1310 * @param cls the `struct GSF_PendingRequest`
1311 */
1312static void
1313warn_delay_task (void *cls)
1314{
1315 struct GSF_PendingRequest *pr = cls;
1316
1317 GNUNET_log (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
1318 _ ("Datastore lookup already took %s!\n"),
1319 GNUNET_STRINGS_relative_time_to_string (
1320 GNUNET_TIME_absolute_get_duration (pr->qe_start),
1321 GNUNET_YES));
1322 pr->warn_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
1323 &warn_delay_task,
1324 pr);
1325}
1326
1327
1328/**
1329 * Task that issues a warning if the datastore lookup takes too long.
1330 *
1331 * @param cls the `struct GSF_PendingRequest`
1332 */
1333static void
1334odc_warn_delay_task (void *cls)
1335{
1336 struct GSF_PendingRequest *pr = cls;
1337
1338 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1339 _ ("On-demand lookup already took %s!\n"),
1340 GNUNET_STRINGS_relative_time_to_string (
1341 GNUNET_TIME_absolute_get_duration (pr->qe_start),
1342 GNUNET_YES));
1343 pr->warn_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
1344 &odc_warn_delay_task,
1345 pr);
1346}
1347
1348
1349/* Call our continuation (if we have any) */
1350static void
1351call_continuation (struct GSF_PendingRequest *pr)
1352{
1353 GSF_LocalLookupContinuation cont = pr->llc_cont;
1354
1355 GNUNET_assert (NULL == pr->qe);
1356 if (NULL != pr->warn_task)
1357 {
1358 GNUNET_SCHEDULER_cancel (pr->warn_task);
1359 pr->warn_task = NULL;
1360 }
1361 if (NULL == cont)
1362 return; /* no continuation */
1363 pr->llc_cont = NULL;
1364 if (0 != (GSF_PRO_LOCAL_ONLY & pr->public_data.options))
1365 {
1366 if (GNUNET_BLOCK_EVALUATION_OK_LAST != pr->local_result)
1367 {
1368 /* Signal that we are done and that there won't be any
1369 additional results to allow client to clean up state. */
1370 pr->rh (pr->rh_cls,
1371 GNUNET_BLOCK_EVALUATION_OK_LAST,
1372 pr,
1373 UINT32_MAX,
1374 GNUNET_TIME_UNIT_ZERO_ABS,
1375 GNUNET_TIME_UNIT_FOREVER_ABS,
1376 GNUNET_BLOCK_TYPE_ANY,
1377 NULL,
1378 0);
1379 }
1380 /* Finally, call our continuation to signal that we are
1381 done with local processing of this request; i.e. to
1382 start reading again from the client. */
1383 cont (pr->llc_cont_cls, NULL, GNUNET_BLOCK_EVALUATION_OK_LAST);
1384 return;
1385 }
1386
1387 cont (pr->llc_cont_cls, pr, pr->local_result);
1388}
1389
1390
1391/* Update stats and call continuation */
1392static void
1393no_more_local_results (struct GSF_PendingRequest *pr)
1394{
1395 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1396 "No further local responses available.\n");
1397#if INSANE_STATISTICS
1398 if ((GNUNET_BLOCK_TYPE_FS_DBLOCK == pr->public_data.type) ||
1399 (GNUNET_BLOCK_TYPE_FS_IBLOCK == pr->public_data.type))
1400 GNUNET_STATISTICS_update (GSF_stats,
1401 gettext_noop (
1402 "# requested DBLOCK or IBLOCK not found"),
1403 1,
1404 GNUNET_NO);
1405#endif
1406 call_continuation (pr);
1407}
1408
1409
1410/* forward declaration */
1411static void
1412process_local_reply (void *cls,
1413 const struct GNUNET_HashCode *key,
1414 size_t size,
1415 const void *data,
1416 enum GNUNET_BLOCK_Type type,
1417 uint32_t priority,
1418 uint32_t anonymity,
1419 uint32_t replication,
1420 struct GNUNET_TIME_Absolute expiration,
1421 uint64_t uid);
1422
1423
1424/* Start a local query */
1425static void
1426start_local_query (struct GSF_PendingRequest *pr,
1427 uint64_t next_uid,
1428 bool random)
1429{
1430 pr->qe_start = GNUNET_TIME_absolute_get ();
1431 pr->warn_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
1432 &warn_delay_task,
1433 pr);
1434 pr->qe = GNUNET_DATASTORE_get_key (GSF_dsh,
1435 next_uid,
1436 random,
1437 &pr->public_data.query,
1438 pr->public_data.type ==
1439 GNUNET_BLOCK_TYPE_FS_DBLOCK
1440 ? GNUNET_BLOCK_TYPE_ANY
1441 : pr->public_data.type,
1442 (0 != (GSF_PRO_PRIORITY_UNLIMITED
1443 & pr->public_data.options))
1444 ? UINT_MAX
1445 : 1
1446 /* queue priority */,
1447 (0 != (GSF_PRO_PRIORITY_UNLIMITED
1448 & pr->public_data.options))
1449 ? UINT_MAX
1450 : GSF_datastore_queue_size
1451 /* max queue size */,
1452 &process_local_reply,
1453 pr);
1454 if (NULL != pr->qe)
1455 return;
1456 GNUNET_log (
1457 GNUNET_ERROR_TYPE_DEBUG,
1458 "ERROR Requesting `%s' of type %d with next_uid %llu from datastore.\n",
1459 GNUNET_h2s (&pr->public_data.query),
1460 pr->public_data.type,
1461 (unsigned long long) next_uid);
1462 GNUNET_STATISTICS_update (GSF_stats,
1463 gettext_noop (
1464 "# Datastore lookups concluded (error queueing)"),
1465 1,
1466 GNUNET_NO);
1467 call_continuation (pr);
1468}
1469
1470
1471/**
1472 * We're processing (local) results for a search request
1473 * from another peer. Pass applicable results to the
1474 * peer and if we are done either clean up (operation
1475 * complete) or forward to other peers (more results possible).
1476 *
1477 * @param cls our closure (`struct GSF_PendingRequest *`)
1478 * @param key key for the content
1479 * @param size number of bytes in @a data
1480 * @param data content stored
1481 * @param type type of the content
1482 * @param priority priority of the content
1483 * @param anonymity anonymity-level for the content
1484 * @param replication replication-level for the content
1485 * @param expiration expiration time for the content
1486 * @param uid unique identifier for the datum;
1487 * maybe 0 if no unique identifier is available
1488 */
1489static void
1490process_local_reply (void *cls,
1491 const struct GNUNET_HashCode *key,
1492 size_t size,
1493 const void *data,
1494 enum GNUNET_BLOCK_Type type,
1495 uint32_t priority,
1496 uint32_t anonymity,
1497 uint32_t replication,
1498 struct GNUNET_TIME_Absolute expiration,
1499 uint64_t uid)
1500{
1501 struct GSF_PendingRequest *pr = cls;
1502 struct ProcessReplyClosure prq;
1503 struct GNUNET_HashCode query;
1504 unsigned int old_rf;
1505
1506 GNUNET_SCHEDULER_cancel (pr->warn_task);
1507 pr->warn_task = NULL;
1508 if (NULL == pr->qe)
1509 goto called_from_on_demand;
1510 pr->qe = NULL;
1511 if (
1512 (NULL == key) && pr->seen_null &&
1513 ! pr->have_first_uid) /* We have hit the end for the 2nd time with no results */
1514 {
1515 /* No results */
1516#if INSANE_STATISTICS
1517 GNUNET_STATISTICS_update (GSF_stats,
1518 gettext_noop (
1519 "# Datastore lookups concluded (no results)"),
1520 1,
1521 GNUNET_NO);
1522#endif
1523 no_more_local_results (pr);
1524 return;
1525 }
1526 if (((NULL == key) &&
1527 pr->seen_null) || /* We have hit the end for the 2nd time OR */
1528 (pr->seen_null && pr->have_first_uid &&
1529 (uid >= pr->first_uid))) /* We have hit the end and past first UID */
1530 {
1531 /* Seen all results */
1532 GNUNET_STATISTICS_update (GSF_stats,
1533 gettext_noop (
1534 "# Datastore lookups concluded (seen all)"),
1535 1,
1536 GNUNET_NO);
1537 no_more_local_results (pr);
1538 return;
1539 }
1540 if (NULL == key)
1541 {
1542 GNUNET_assert (! pr->seen_null);
1543 pr->seen_null = true;
1544 start_local_query (pr, 0 /* next_uid */, false /* random */);
1545 return;
1546 }
1547 if (! pr->have_first_uid)
1548 {
1549 pr->first_uid = uid;
1550 pr->have_first_uid = true;
1551 }
1552 pr->result_count++;
1553 if (pr->result_count > MAX_RESULTS)
1554 {
1555 GNUNET_STATISTICS_update (
1556 GSF_stats,
1557 gettext_noop ("# Datastore lookups aborted (more than MAX_RESULTS)"),
1558 1,
1559 GNUNET_NO);
1560 no_more_local_results (pr);
1561 return;
1562 }
1563 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1564 "Received reply for `%s' of type %d with UID %llu from datastore.\n",
1565 GNUNET_h2s (key),
1566 type,
1567 (unsigned long long) uid);
1568 if (GNUNET_BLOCK_TYPE_FS_ONDEMAND == type)
1569 {
1570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1571 "Found ONDEMAND block, performing on-demand encoding\n");
1572 GNUNET_STATISTICS_update (GSF_stats,
1573 gettext_noop (
1574 "# on-demand blocks matched requests"),
1575 1,
1576 GNUNET_NO);
1577 pr->qe_start = GNUNET_TIME_absolute_get ();
1578 pr->warn_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
1579 &odc_warn_delay_task,
1580 pr);
1581 if (GNUNET_OK == GNUNET_FS_handle_on_demand_block (key,
1582 size,
1583 data,
1584 type,
1585 priority,
1586 anonymity,
1587 replication,
1588 expiration,
1589 uid,
1590 &process_local_reply,
1591 pr))
1592 {
1593 GNUNET_STATISTICS_update (GSF_stats,
1594 gettext_noop (
1595 "# on-demand lookups performed successfully"),
1596 1,
1597 GNUNET_NO);
1598 return; /* we're done */
1599 }
1600 GNUNET_STATISTICS_update (GSF_stats,
1601 gettext_noop ("# on-demand lookups failed"),
1602 1,
1603 GNUNET_NO);
1604 GNUNET_SCHEDULER_cancel (pr->warn_task);
1605 start_local_query (pr, uid + 1 /* next_uid */, false /* random */);
1606 return;
1607 }
1608called_from_on_demand:
1609 old_rf = pr->public_data.results_found;
1610 memset (&prq, 0, sizeof(prq));
1611 prq.data = data;
1612 prq.expiration = expiration;
1613 prq.size = size;
1614 if (GNUNET_OK !=
1615 GNUNET_BLOCK_get_key (GSF_block_ctx, type, data, size, &query))
1616 {
1617 GNUNET_break (0);
1618 GNUNET_DATASTORE_remove (GSF_dsh,
1619 key,
1620 size,
1621 data,
1622 UINT_MAX,
1623 UINT_MAX,
1624 NULL,
1625 NULL);
1626 start_local_query (pr, uid + 1 /* next_uid */, false /* random */);
1627 return;
1628 }
1629 prq.type = type;
1630 prq.priority = priority;
1631 prq.request_found = GNUNET_NO;
1632 prq.anonymity_level = anonymity;
1633 if ((0 == old_rf) && (0 == pr->public_data.results_found))
1634 GSF_update_datastore_delay_ (pr->public_data.start_time);
1635 prq.eo = GNUNET_BLOCK_EO_LOCAL_SKIP_CRYPTO;
1636 process_reply (&prq, key, pr);
1637 pr->local_result = prq.eval;
1638 if (GNUNET_BLOCK_EVALUATION_OK_LAST == prq.eval)
1639 {
1640 GNUNET_STATISTICS_update (
1641 GSF_stats,
1642 gettext_noop ("# Datastore lookups concluded (found last result)"),
1643 1,
1644 GNUNET_NO);
1645 call_continuation (pr);
1646 return;
1647 }
1648 if ((0 == (GSF_PRO_PRIORITY_UNLIMITED & pr->public_data.options)) &&
1649 ((GNUNET_YES == GSF_test_get_load_too_high_ (0)) ||
1650 (pr->public_data.results_found > 5 + 2 * pr->public_data.priority)))
1651 {
1652 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Load too high, done with request\n");
1653 GNUNET_STATISTICS_update (GSF_stats,
1654 gettext_noop (
1655 "# Datastore lookups concluded (load too high)"),
1656 1,
1657 GNUNET_NO);
1658 call_continuation (pr);
1659 return;
1660 }
1661 start_local_query (pr, uid + 1 /* next_uid */, false /* random */);
1662}
1663
1664
1665/**
1666 * Is the given target a legitimate peer for forwarding the given request?
1667 *
1668 * @param pr request
1669 * @param target
1670 * @return #GNUNET_YES if this request could be forwarded to the given peer
1671 */
1672int
1673GSF_pending_request_test_target_ (struct GSF_PendingRequest *pr,
1674 const struct GNUNET_PeerIdentity *target)
1675{
1676 struct GNUNET_PeerIdentity pi;
1677
1678 if (0 == pr->origin_pid)
1679 return GNUNET_YES;
1680 GNUNET_PEER_resolve (pr->origin_pid, &pi);
1681 return (0 == memcmp (&pi, target, sizeof(struct GNUNET_PeerIdentity)))
1682 ? GNUNET_NO
1683 : GNUNET_YES;
1684}
1685
1686
1687/**
1688 * Look up the request in the local datastore.
1689 *
1690 * @param pr the pending request to process
1691 * @param cont function to call at the end
1692 * @param cont_cls closure for @a cont
1693 */
1694void
1695GSF_local_lookup_ (struct GSF_PendingRequest *pr,
1696 GSF_LocalLookupContinuation cont,
1697 void *cont_cls)
1698{
1699 GNUNET_assert (NULL == pr->gh);
1700 GNUNET_assert (NULL == pr->cadet_request);
1701 GNUNET_assert (NULL == pr->llc_cont);
1702 pr->llc_cont = cont;
1703 pr->llc_cont_cls = cont_cls;
1704#if INSANE_STATISTICS
1705 GNUNET_STATISTICS_update (GSF_stats,
1706 gettext_noop ("# Datastore lookups initiated"),
1707 1,
1708 GNUNET_NO);
1709#endif
1710 start_local_query (pr, 0 /* next_uid */, true /* random */);
1711}
1712
1713
1714/**
1715 * Handle P2P "CONTENT" message. Checks that the message is
1716 * well-formed and then checks if there are any pending requests for
1717 * this content and possibly passes it on (to local clients or other
1718 * peers). Does NOT perform migration (content caching at this peer).
1719 *
1720 * @param cls the other peer involved
1721 * @param put the actual message
1722 */
1723void
1724handle_p2p_put (void *cls, const struct PutMessage *put)
1725{
1726 struct GSF_ConnectedPeer *cp = cls;
1727 uint16_t msize;
1728 size_t dsize;
1729 enum GNUNET_BLOCK_Type type;
1730 struct GNUNET_TIME_Absolute expiration;
1731 struct GNUNET_HashCode query;
1732 struct ProcessReplyClosure prq;
1733 struct GNUNET_TIME_Relative block_time;
1734 double putl;
1735 struct PutMigrationContext *pmc;
1736
1737 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1738 "Received P2P PUT from %s\n",
1739 GNUNET_i2s (GSF_get_peer_performance_data_ (cp)->peer));
1740 GSF_cover_content_count++;
1741 msize = ntohs (put->header.size);
1742 dsize = msize - sizeof(struct PutMessage);
1743 type = ntohl (put->type);
1744 expiration = GNUNET_TIME_absolute_ntoh (put->expiration);
1745 /* do not allow migrated content to live longer than 1 year */
1746 expiration = GNUNET_TIME_absolute_min (GNUNET_TIME_relative_to_absolute (
1747 GNUNET_TIME_UNIT_YEARS),
1748 expiration);
1749 if (GNUNET_OK !=
1750 GNUNET_BLOCK_get_key (GSF_block_ctx, type, &put[1], dsize, &query))
1751 {
1752 GNUNET_break_op (0);
1753 return;
1754 }
1755 GNUNET_STATISTICS_update (GSF_stats,
1756 gettext_noop ("# GAP PUT messages received"),
1757 1,
1758 GNUNET_NO);
1759 /* now, lookup 'query' */
1760 prq.data = (const void *) &put[1];
1761 prq.sender = cp;
1762 prq.size = dsize;
1763 prq.type = type;
1764 prq.expiration = expiration;
1765 prq.priority = 0;
1766 prq.anonymity_level = UINT32_MAX;
1767 prq.request_found = GNUNET_NO;
1768 prq.eo = GNUNET_BLOCK_EO_NONE;
1769 GNUNET_CONTAINER_multihashmap_get_multiple (pr_map,
1770 &query,
1771 &process_reply,
1772 &prq);
1773 if (NULL != cp)
1774 {
1775 GSF_connected_peer_change_preference_ (cp,
1776 CONTENT_BANDWIDTH_VALUE
1777 + 1000 * prq.priority);
1778 GSF_get_peer_performance_data_ (cp)->respect += prq.priority;
1779 }
1780 if ((GNUNET_YES == active_to_migration) && (NULL != cp) &&
1781 (GNUNET_NO == test_put_load_too_high (prq.priority)))
1782 {
1783 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1784 "Replicating result for query `%s' with priority %u\n",
1785 GNUNET_h2s (&query),
1786 prq.priority);
1787 pmc = GNUNET_new (struct PutMigrationContext);
1788 pmc->start = GNUNET_TIME_absolute_get ();
1789 pmc->requested = prq.request_found;
1790 GNUNET_assert (0 != GSF_get_peer_performance_data_ (cp)->pid);
1791 GNUNET_PEER_resolve (GSF_get_peer_performance_data_ (cp)->pid,
1792 &pmc->origin);
1793 if (NULL == GNUNET_DATASTORE_put (GSF_dsh,
1794 0,
1795 &query,
1796 dsize,
1797 &put[1],
1798 type,
1799 prq.priority,
1800 1 /* anonymity */,
1801 0 /* replication */,
1802 expiration,
1803 1 + prq.priority,
1804 MAX_DATASTORE_QUEUE,
1805 &put_migration_continuation,
1806 pmc))
1807 {
1808 put_migration_continuation (pmc,
1809 GNUNET_SYSERR,
1810 GNUNET_TIME_UNIT_ZERO_ABS,
1811 NULL);
1812 }
1813 }
1814 else if (NULL != cp)
1815 {
1816 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1817 "Choosing not to keep content `%s' (%d/%d)\n",
1818 GNUNET_h2s (&query),
1819 active_to_migration,
1820 test_put_load_too_high (prq.priority));
1821 }
1822 putl = GNUNET_LOAD_get_load (datastore_put_load);
1823 if ((NULL != cp) && (GNUNET_NO == prq.request_found) &&
1824 ((GNUNET_YES != active_to_migration) ||
1825 (putl > 2.5 * (1 + prq.priority))))
1826 {
1827 if (GNUNET_YES != active_to_migration)
1828 putl = 1.0 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 5);
1829 block_time = GNUNET_TIME_relative_multiply (
1830 GNUNET_TIME_UNIT_MILLISECONDS,
1831 5000 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1832 (unsigned int) (60000 * putl * putl)));
1833 GNUNET_log (
1834 GNUNET_ERROR_TYPE_DEBUG,
1835 "Asking to stop migration for %s because of load %f and events %d/%d\n",
1836 GNUNET_STRINGS_relative_time_to_string (block_time, GNUNET_YES),
1837 putl,
1838 active_to_migration,
1839 (GNUNET_NO == prq.request_found));
1840 GSF_block_peer_migration_ (cp,
1841 GNUNET_TIME_relative_to_absolute (block_time));
1842 }
1843}
1844
1845
1846/**
1847 * Check if the given request is still active.
1848 *
1849 * @param pr pending request
1850 * @return #GNUNET_YES if the request is still active
1851 */
1852int
1853GSF_pending_request_test_active_ (struct GSF_PendingRequest *pr)
1854{
1855 return (NULL != pr->rh) ? GNUNET_YES : GNUNET_NO;
1856}
1857
1858
1859/**
1860 * Setup the subsystem.
1861 */
1862void
1863GSF_pending_request_init_ ()
1864{
1865 if (GNUNET_OK !=
1866 GNUNET_CONFIGURATION_get_value_number (GSF_cfg,
1867 "fs",
1868 "MAX_PENDING_REQUESTS",
1869 &max_pending_requests))
1870 {
1871 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_INFO,
1872 "fs",
1873 "MAX_PENDING_REQUESTS");
1874 }
1875 active_to_migration =
1876 GNUNET_CONFIGURATION_get_value_yesno (GSF_cfg, "FS", "CONTENT_CACHING");
1877 datastore_put_load = GNUNET_LOAD_value_init (DATASTORE_LOAD_AUTODECLINE);
1878 pr_map = GNUNET_CONTAINER_multihashmap_create (32 * 1024, GNUNET_YES);
1879 requests_by_expiration_heap =
1880 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1881}
1882
1883
1884/**
1885 * Shutdown the subsystem.
1886 */
1887void
1888GSF_pending_request_done_ ()
1889{
1890 GNUNET_CONTAINER_multihashmap_iterate (pr_map, &clean_request, NULL);
1891 GNUNET_CONTAINER_multihashmap_destroy (pr_map);
1892 pr_map = NULL;
1893 GNUNET_CONTAINER_heap_destroy (requests_by_expiration_heap);
1894 requests_by_expiration_heap = NULL;
1895 GNUNET_LOAD_value_free (datastore_put_load);
1896 datastore_put_load = NULL;
1897}
1898
1899
1900/* end of gnunet-service-fs_pr.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-26 05:55:36 +0000