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22 * @file rps/gnunet-service-rps_sampler.c
23 * @brief sampler implementation
24 * @author Julius Bünger
27 #include "gnunet_util_lib.h"
30 #include "gnunet-service-rps_sampler.h"
35 #define LOG(kind, ...) GNUNET_log(kind, __VA_ARGS__)
37 // multiple 'clients'?
39 // TODO check for overflows
41 // TODO align message structs
43 // hist_size_init, hist_size_max
45 /***********************************************************************
46 * WARNING: This section needs to be reviewed regarding the use of
47 * functions providing (pseudo)randomness!
48 ***********************************************************************/
50 // TODO care about invalid input of the caller (size 0 or less...)
59 * A sampler element sampling one PeerID at a time.
61 struct RPS_SamplerElement
64 * Min-wise linear permutation used by this sampler.
66 * This is an key later used by a hmac.
68 struct GNUNET_CRYPTO_AuthKey auth_key;
71 * The PeerID this sampler currently samples.
73 struct GNUNET_PeerIdentity peer_id;
76 * The according hash value of this PeerID.
78 struct GNUNET_HashCode peer_id_hash;
82 * Time of last request.
84 struct GNUNET_TIME_Absolute last_client_request;
87 * Flag that indicates that we are not holding a valid PeerID right now.
89 enum RPS_SamplerEmpty is_empty;
94 struct GNUNET_TIME_Absolute birth;
97 * How many times a PeerID was put in this sampler.
102 * How many times this sampler changed the peer_id.
108 * Sampler with its own array of SamplerElements
113 * Number of sampler elements we hold.
115 unsigned int sampler_size;
119 * All Samplers in one array.
121 struct RPS_SamplerElement **sampler_elements;
124 * Max time a round takes
126 * Used in the context of RPS
128 struct GNUNET_TIME_Relative max_round_interval;
131 * Callback to be called when a peer gets inserted into a sampler.
133 RPS_sampler_insert_cb insert_cb;
136 * Closure to the insert_cb.
141 * Callback to be called when a peer gets inserted into a sampler.
143 RPS_sampler_remove_cb remove_cb;
146 * Closure to the remove_cb.
152 * Closure to _get_n_rand_peers_ready_cb()
154 struct RPS_GetNRandPeersReadyCls
157 * Number of peers we are waiting for.
162 * Number of peers we currently have.
164 uint32_t cur_num_peers;
167 * Pointer to the array holding the ids.
169 struct GNUNET_PeerIdentity *ids;
172 * Callback to be called when all ids are available.
174 RPS_sampler_n_rand_peers_ready_cb callback;
177 * Closure given to the callback
183 * Callback that is called from _get_rand_peer() when the PeerID is ready.
185 * @param cls the closure given alongside this function.
186 * @param id the PeerID that was returned
189 (*RPS_sampler_rand_peer_ready_cb) (void *cls,
190 const struct GNUNET_PeerIdentity *id);
193 * Closure to #RPS_sampler_get_rand_peer()
198 * The task for this function.
200 struct GNUNET_SCHEDULER_Task *get_peer_task;
205 RPS_sampler_rand_peer_ready_cb cb;
208 * The closure to the callback
213 * The address of the id to be stored at
215 struct GNUNET_PeerIdentity *id;
219 * Multihashmap that keeps track of all get_peer_tasks that are still scheduled.
221 struct GNUNET_CONTAINER_MultiHashMap *get_peer_tasks;
225 * Global sampler variable.
227 struct RPS_Sampler *sampler;
231 * The minimal size for the extended sampler elements.
233 static size_t min_size;
236 * The maximal size the extended sampler elements should grow to.
238 static size_t max_size;
241 * The size the extended sampler elements currently have.
243 //static size_t extra_size;
246 * Inedex to the sampler element that is the next to be returned
248 static uint32_t client_get_index;
252 * Callback to _get_rand_peer() used by _get_n_rand_peers().
254 * Checks whether all n peers are available. If they are,
258 RPS_sampler_get_n_rand_peers_ready_cb (void *cls,
259 const struct GNUNET_PeerIdentity *id)
261 struct RPS_GetNRandPeersReadyCls *n_peers_cls;
263 n_peers_cls = (struct RPS_GetNRandPeersReadyCls *) cls;
265 LOG (GNUNET_ERROR_TYPE_DEBUG,
266 "SAMPLER: Got %" PRIX32 "th of %" PRIX32 " peers\n",
267 n_peers_cls->cur_num_peers, n_peers_cls->num_peers);
269 if (n_peers_cls->num_peers - 1 == n_peers_cls->cur_num_peers)
270 { /* All peers are ready -- return those to the client */
271 GNUNET_assert (NULL != n_peers_cls->callback);
273 LOG (GNUNET_ERROR_TYPE_DEBUG,
274 "SAMPLER: returning %" PRIX32 " peers to the client\n",
275 n_peers_cls->num_peers);
276 n_peers_cls->callback (n_peers_cls->cls, n_peers_cls->ids, n_peers_cls->num_peers);
278 GNUNET_free (n_peers_cls);
284 * Reinitialise a previously initialised sampler element.
286 * @param sampler pointer to the memory that keeps the value.
289 RPS_sampler_elem_reinit (struct RPS_SamplerElement *sampler_el)
291 sampler_el->is_empty = EMPTY;
293 // I guess I don't need to call GNUNET_CRYPTO_hmac_derive_key()...
294 GNUNET_CRYPTO_random_block(GNUNET_CRYPTO_QUALITY_STRONG,
295 &(sampler_el->auth_key.key),
296 GNUNET_CRYPTO_HASH_LENGTH);
298 sampler_el->last_client_request = GNUNET_TIME_UNIT_FOREVER_ABS;
300 /* We might want to keep the previous peer */
302 //GNUNET_CRYPTO_hmac(&sampler_el->auth_key, sampler_el->peer_id,
303 // sizeof(struct GNUNET_PeerIdentity),
304 // &sampler_el->peer_id_hash);
306 sampler_el->birth = GNUNET_TIME_absolute_get ();
307 sampler_el->num_peers = 0;
308 sampler_el->num_change = 0;
313 * (Re)Initialise given Sampler with random min-wise independent function.
315 * In this implementation this means choosing an auth_key for later use in
318 * @return a newly created RPS_SamplerElement which currently holds no id.
320 struct RPS_SamplerElement *
321 RPS_sampler_elem_create (void)
323 struct RPS_SamplerElement *s;
325 s = GNUNET_new (struct RPS_SamplerElement);
327 RPS_sampler_elem_reinit (s);
328 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: initialised with empty PeerID\n");
335 * Input an PeerID into the given sampler.
338 RPS_sampler_elem_next (struct RPS_SamplerElement *s_elem, const struct GNUNET_PeerIdentity *other,
339 RPS_sampler_insert_cb insert_cb, void *insert_cls,
340 RPS_sampler_remove_cb remove_cb, void *remove_cls)
342 struct GNUNET_HashCode other_hash;
346 if ( 0 == GNUNET_CRYPTO_cmp_peer_identity (other, &(s_elem->peer_id)) )
348 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Got PeerID %s\n",
350 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Have already PeerID %s\n",
351 GNUNET_i2s (&(s_elem->peer_id)));
355 GNUNET_CRYPTO_hmac(&s_elem->auth_key,
357 sizeof(struct GNUNET_PeerIdentity),
360 if ( EMPTY == s_elem->is_empty )
362 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Got PeerID %s; Simply accepting (was empty previously).\n",
364 s_elem->peer_id = *other;
365 s_elem->peer_id_hash = other_hash;
367 if (NULL != sampler->insert_cb)
368 sampler->insert_cb (sampler->insert_cls, &(s_elem->peer_id));
370 s_elem->num_change++;
372 else if ( 0 > GNUNET_CRYPTO_hash_cmp (&other_hash, &s_elem->peer_id_hash) )
374 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Got PeerID %s\n",
376 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Discarding old PeerID %s\n",
377 GNUNET_i2s (&s_elem->peer_id));
379 if ( NULL != sampler->remove_cb )
381 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Removing old PeerID %s with the remove callback.\n",
382 GNUNET_i2s (&s_elem->peer_id));
383 sampler->remove_cb (sampler->remove_cls, &s_elem->peer_id);
386 s_elem->peer_id = *other;
387 s_elem->peer_id_hash = other_hash;
389 if ( NULL != sampler->insert_cb )
391 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Inserting new PeerID %s with the insert callback.\n",
392 GNUNET_i2s (&s_elem->peer_id));
393 sampler->insert_cb(sampler->insert_cls, &s_elem->peer_id);
396 s_elem->num_change++;
400 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Got PeerID %s\n",
402 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Keeping old PeerID %s\n",
403 GNUNET_i2s(&s_elem->peer_id));
406 s_elem->is_empty = NOT_EMPTY;
411 * Grow or shrink the size of the sampler.
413 * @param new_size the new size of the sampler
416 RPS_sampler_resize (unsigned int new_size)
418 unsigned int old_size;
420 struct RPS_SamplerElement **rem_list;
422 // TODO check min and max size
424 old_size = sampler->sampler_size;
426 if (old_size > new_size)
428 /* Temporary store those to properly call the removeCB on those later */
429 rem_list = GNUNET_malloc ((old_size - new_size) * sizeof (struct RPS_SamplerElement *));
431 &sampler->sampler_elements[new_size],
432 (old_size - new_size) * sizeof (struct RPS_SamplerElement *));
434 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Shrinking sampler %d -> %d\n", old_size, new_size);
435 GNUNET_array_grow (sampler->sampler_elements, sampler->sampler_size, new_size);
436 LOG (GNUNET_ERROR_TYPE_DEBUG,
437 "SAMPLER: sampler->sampler_elements now points to %p\n",
438 sampler->sampler_elements);
440 for (i = 0 ; i < old_size - new_size ; i++)
441 {/* Remove unneeded rest */
442 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Removing %" PRIX32 ". sampler\n", i);
443 if (NULL != sampler->remove_cb)
444 sampler->remove_cb (sampler->remove_cls, &rem_list[i]->peer_id);
445 GNUNET_free (rem_list[i]);
447 GNUNET_free (rem_list);
449 else if (old_size < new_size)
451 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Growing sampler %d -> %d\n", old_size, new_size);
452 GNUNET_array_grow (sampler->sampler_elements, sampler->sampler_size, new_size);
453 LOG (GNUNET_ERROR_TYPE_DEBUG,
454 "SAMPLER: sampler->sampler_elements now points to %p\n",
455 sampler->sampler_elements);
457 for ( i = old_size ; i < new_size ; i++ )
458 { /* Add new sampler elements */
459 sampler->sampler_elements[i] = RPS_sampler_elem_create ();
460 if (NULL != sampler->insert_cb)
461 sampler->insert_cb (sampler->insert_cls, &sampler->sampler_elements[i]->peer_id);
462 LOG (GNUNET_ERROR_TYPE_DEBUG,
463 "SAMPLER: Added %" PRIX32 ". sampler, now pointing to %p, contains %s\n",
464 i, &sampler->sampler_elements[i], GNUNET_i2s (&sampler->sampler_elements[i]->peer_id));
469 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Size remains the same -- nothing to do\n");
473 GNUNET_assert(sampler->sampler_size == new_size);
474 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Finished growing/shrinking.\n"); // remove
479 * Initialise a tuple of sampler elements.
481 * @param init_size the size the sampler is initialised with
482 * @param id with which all newly created sampler elements are initialised
483 * @param ins_cb the callback that will be called on every PeerID that is
484 * newly inserted into a sampler element
485 * @param ins_cls the closure given to #ins_cb
486 * @param rem_cb the callback that will be called on every PeerID that is
487 * removed from a sampler element
488 * @param rem_cls the closure given to #rem_cb
491 RPS_sampler_init (size_t init_size,
492 const struct GNUNET_PeerIdentity *id,
493 struct GNUNET_TIME_Relative max_round_interval,
494 RPS_sampler_insert_cb ins_cb, void *ins_cls,
495 RPS_sampler_remove_cb rem_cb, void *rem_cls)
497 //struct RPS_Sampler *sampler;
500 /* Initialise context around extended sampler */
501 min_size = 10; // TODO make input to _samplers_init()
502 max_size = 1000; // TODO make input to _samplers_init()
504 sampler = GNUNET_new (struct RPS_Sampler);
505 sampler->sampler_size = 0;
506 sampler->sampler_elements = NULL;
507 sampler->max_round_interval = max_round_interval;
508 sampler->insert_cb = ins_cb;
509 sampler->insert_cls = ins_cls;
510 sampler->remove_cb = rem_cb;
511 sampler->remove_cls = rem_cls;
512 get_peer_tasks = GNUNET_CONTAINER_multihashmap_create (4, GNUNET_NO);
513 //sampler->sampler_elements = GNUNET_new_array(init_size, struct GNUNET_PeerIdentity);
514 //GNUNET_array_grow (sampler->sampler_elements, sampler->sampler_size, min_size);
515 RPS_sampler_resize (init_size);
516 RPS_sampler_update_list (id); // no super nice desing but ok for the moment
518 client_get_index = 0;
520 //GNUNET_assert (init_size == sampler->sampler_size);
525 * A fuction to update every sampler in the given list
527 * @param id the PeerID that is put in the sampler
530 RPS_sampler_update_list (const struct GNUNET_PeerIdentity *id)
534 for ( i = 0 ; i < sampler->sampler_size ; i++ )
535 RPS_sampler_elem_next (sampler->sampler_elements[i], id,
536 sampler->insert_cb, sampler->insert_cls,
537 sampler->remove_cb, sampler->remove_cls);
542 * Reinitialise all previously initialised sampler elements with the given value.
544 * Used to get rid of a PeerID.
546 * @param id the id of the sampler elements to update.
549 RPS_sampler_reinitialise_by_value (const struct GNUNET_PeerIdentity *id)
553 for ( i = 0 ; i < sampler->sampler_size ; i++ )
555 if ( 0 == GNUNET_CRYPTO_cmp_peer_identity(id, &(sampler->sampler_elements[i]->peer_id)) )
557 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Reinitialising sampler\n");
558 RPS_sampler_elem_reinit (sampler->sampler_elements[i]);
565 * Get one random peer out of the sampled peers.
567 * We might want to reinitialise this sampler after giving the
568 * corrsponding peer to the client.
569 * Only used internally
571 const struct GNUNET_PeerIdentity *
572 RPS_sampler_get_rand_peer_ ()
575 const struct GNUNET_PeerIdentity *peer; // do we have to malloc that?
577 // TODO implement extra logic
580 * Choose the r_index of the peer we want to return
581 * at random from the interval of the gossip list
583 r_index = GNUNET_CRYPTO_random_u64(GNUNET_CRYPTO_QUALITY_STRONG,
584 sampler->sampler_size);
586 //if ( EMPTY == sampler->sampler_elements[r_index]->is_empty )
587 // // TODO schedule for later
590 peer = &(sampler->sampler_elements[r_index]->peer_id);
591 //sampler->sampler_elements[r_index]->last_client_request = GNUNET_TIME_absolute_get();
592 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sgrp: Returning PeerID %s\n", GNUNET_i2s(peer));
599 * Get n random peers out of the sampled peers.
601 * We might want to reinitialise this sampler after giving the
602 * corrsponding peer to the client.
603 * Random with or without consumption?
604 * Only used internally
606 const struct GNUNET_PeerIdentity *
607 RPS_sampler_get_n_rand_peers_ (uint32_t n)
609 if ( 0 == sampler->sampler_size )
611 LOG (GNUNET_ERROR_TYPE_DEBUG,
612 "Sgrp: List empty - Returning NULL\n");
617 // TODO check if we have too much (distinct) sampled peers
618 // If we are not ready yet maybe schedule for later
619 struct GNUNET_PeerIdentity *peers;
622 peers = GNUNET_malloc (n * sizeof(struct GNUNET_PeerIdentity));
624 for ( i = 0 ; i < n ; i++ ) {
625 //peers[i] = RPS_sampler_get_rand_peer_(sampler->sampler_elements);
626 memcpy (&peers[i], RPS_sampler_get_rand_peer_ (), sizeof (struct GNUNET_PeerIdentity));
634 * Get one random peer out of the sampled peers.
636 * We might want to reinitialise this sampler after giving the
637 * corrsponding peer to the client.
639 * @return a random PeerID of the PeerIDs previously put into the sampler.
642 //RPS_sampler_get_rand_peer (RPS_sampler_rand_peer_ready_cb cb,
643 // void *cls, struct GNUNET_PeerIdentity *id)
644 RPS_sampler_get_rand_peer (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
646 struct GetPeerCls *gpc;
647 struct RPS_SamplerElement *s_elem;
648 struct GNUNET_TIME_Relative last_request_diff;
649 struct GNUNET_HashCode *hash;
650 uint32_t tmp_client_get_index;
651 //struct GNUNET_TIME_Relative inv_last_request_diff;
653 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Single peer was requested\n");
655 gpc = (struct GetPeerCls *) cls;
656 hash = GNUNET_new (struct GNUNET_HashCode);
657 if (0 < client_get_index)
658 tmp_client_get_index = client_get_index - 1;
660 tmp_client_get_index = sampler->sampler_size - 1;
662 LOG (GNUNET_ERROR_TYPE_DEBUG,
663 "SAMPLER: scheduling for later if index reaches %" PRIX32 " (sampler size: %" PRIX32 ".\n",
664 tmp_client_get_index, sampler->sampler_size);
667 { /* Get first non empty sampler */
668 if (tmp_client_get_index == client_get_index)
670 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: reached tmp_index %" PRIX32 ".\n", client_get_index);
671 gpc->get_peer_task = GNUNET_SCHEDULER_add_delayed (sampler->max_round_interval,
672 &RPS_sampler_get_rand_peer,
677 *gpc->id = sampler->sampler_elements[client_get_index]->peer_id;
679 RPS_sampler_elem_reinit (sampler->sampler_elements[client_get_index]);
680 if ( client_get_index == sampler->sampler_size - 1 )
681 client_get_index = 0;
684 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: incremented index to %" PRIX32 ".\n", client_get_index);
685 } while (EMPTY == sampler->sampler_elements[client_get_index]->is_empty);
687 s_elem = sampler->sampler_elements[client_get_index];
689 /* Check whether we may use this sampler to give it back to the client */
690 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us != s_elem->last_client_request.abs_value_us)
692 last_request_diff = GNUNET_TIME_absolute_get_difference (s_elem->last_client_request,
693 GNUNET_TIME_absolute_get ());
694 /* We're not going to give it back now if it was already requested by a client this round */
695 if (last_request_diff.rel_value_us < sampler->max_round_interval.rel_value_us)
697 LOG (GNUNET_ERROR_TYPE_DEBUG,
698 "SAMPLER: Last client request on this sampler was less than max round interval ago -- scheduling for later\n");
699 ///* How many time remains untile the next round has started? */
700 //inv_last_request_diff = GNUNET_TIME_absolute_get_difference (last_request_diff,
701 // sampler->max_round_interval);
702 // add a little delay
703 /* Schedule it one round later */
704 gpc->get_peer_task = GNUNET_SCHEDULER_add_delayed (sampler->max_round_interval,
705 &RPS_sampler_get_rand_peer,
709 // TODO add other reasons to wait here
712 GNUNET_CRYPTO_hash (&gpc->get_peer_task, sizeof (struct GNUNET_SCHEDULER_Task *), hash);
713 if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_remove (get_peer_tasks, hash, gpc->get_peer_task))
714 LOG (GNUNET_ERROR_TYPE_WARNING, "SAMPLER: Key to remove is not in the hashmap\n");
715 GNUNET_free (gpc->get_peer_task);
717 s_elem->last_client_request = GNUNET_TIME_absolute_get ();
719 gpc->cb (gpc->cb_cls, gpc->id);
724 * Get n random peers out of the sampled peers.
726 * We might want to reinitialise this sampler after giving the
727 * corrsponding peer to the client.
728 * Random with or without consumption?
730 * @param cb callback that will be called once the ids are ready.
731 * @param cls closure given to @a cb
732 * @param num_peers the number of peers requested
735 RPS_sampler_get_n_rand_peers (RPS_sampler_n_rand_peers_ready_cb cb,
736 void *cls, uint32_t num_peers)
738 if ( 0 == sampler->sampler_size )
740 LOG (GNUNET_ERROR_TYPE_DEBUG,
741 "Sgrp: List empty - Returning NULL\n");
746 // TODO check if we have too much (distinct) sampled peers
747 // If we are not ready yet maybe schedule for later
749 struct RPS_GetNRandPeersReadyCls *cb_cls;
750 struct GetPeerCls *gpc;
751 struct GNUNET_HashCode *hash;
753 hash = GNUNET_new (struct GNUNET_HashCode);
755 cb_cls = GNUNET_new (struct RPS_GetNRandPeersReadyCls);
756 cb_cls->num_peers = num_peers;
757 cb_cls->cur_num_peers = 0;
758 cb_cls->ids = GNUNET_new_array (num_peers, struct GNUNET_PeerIdentity);
759 cb_cls->callback = cb;
762 LOG (GNUNET_ERROR_TYPE_DEBUG,
763 "SAMPLER: Scheduling requests for %" PRIX32 " peers\n", num_peers);
765 for ( i = 0 ; i < num_peers ; i++ )
767 gpc = GNUNET_new (struct GetPeerCls);
768 gpc->cb = RPS_sampler_get_n_rand_peers_ready_cb;
769 gpc->cb_cls = cb_cls;
770 gpc->id = &cb_cls->ids[i];
772 // maybe add a little delay
773 gpc->get_peer_task = GNUNET_SCHEDULER_add_now (&RPS_sampler_get_rand_peer, gpc);
774 GNUNET_CRYPTO_hash (&gpc->get_peer_task, sizeof (struct GNUNET_SCHEDULER_Task *), hash);
775 (void) GNUNET_CONTAINER_multihashmap_put (get_peer_tasks, hash, gpc->get_peer_task,
776 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
777 //RPS_sampler_get_rand_peer (RPS_sampler_get_n_rand_peers_ready_cb,
778 // cb_cls, &peers[i]);
785 * Counts how many Samplers currently hold a given PeerID.
787 * @param id the PeerID to count.
789 * @return the number of occurrences of id.
792 RPS_sampler_count_id (const struct GNUNET_PeerIdentity *id)
798 for ( i = 0 ; i < sampler->sampler_size ; i++ )
800 if ( 0 == GNUNET_CRYPTO_cmp_peer_identity (&sampler->sampler_elements[i]->peer_id, id)
801 && EMPTY != sampler->sampler_elements[i]->is_empty)
809 * Callback to iterate over the hashmap to cancle the get_peer_tasks.
812 clear_get_peer_tasks (void *cls, const struct GNUNET_HashCode *key, void *value)
814 struct GNUNET_SCHEDULER_Task *task;
816 task = (struct GNUNET_SCHEDULER_Task *) value;
817 GNUNET_SCHEDULER_cancel (task);
819 GNUNET_CONTAINER_multihashmap_remove (get_peer_tasks, key, value);
826 * Cleans the sampler.
829 RPS_sampler_destroy ()
831 if (GNUNET_SYSERR == GNUNET_CONTAINER_multihashmap_iterate (get_peer_tasks,
832 clear_get_peer_tasks,
834 LOG (GNUNET_ERROR_TYPE_WARNING, "SAMPLER: iteration over hashmap was cancelled\n");
835 GNUNET_CONTAINER_multihashmap_destroy (get_peer_tasks);
836 RPS_sampler_resize (0);
837 GNUNET_array_grow (sampler->sampler_elements, sampler->sampler_size, 0);
840 /* end of gnunet-service-rps.c */