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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 NRandPeersReadyCls
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 check_n_peers_ready (void *cls,
259 const struct GNUNET_PeerIdentity *id)
261 struct NRandPeersReadyCls *n_peers_cls;
263 n_peers_cls = (struct NRandPeersReadyCls *) cls;
265 LOG (GNUNET_ERROR_TYPE_DEBUG,
266 "SAMPLER: Got %" PRIX32 ". 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 sampler_el->birth = GNUNET_TIME_absolute_get ();
301 sampler_el->num_peers = 0;
302 sampler_el->num_change = 0;
307 * (Re)Initialise given Sampler with random min-wise independent function.
309 * In this implementation this means choosing an auth_key for later use in
312 * @return a newly created RPS_SamplerElement which currently holds no id.
314 struct RPS_SamplerElement *
315 RPS_sampler_elem_create (void)
317 struct RPS_SamplerElement *s;
319 s = GNUNET_new (struct RPS_SamplerElement);
321 RPS_sampler_elem_reinit (s);
322 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: initialised with empty PeerID\n");
329 * Input an PeerID into the given sampler.
332 RPS_sampler_elem_next (struct RPS_SamplerElement *s_elem, const struct GNUNET_PeerIdentity *other,
333 RPS_sampler_insert_cb insert_cb, void *insert_cls,
334 RPS_sampler_remove_cb remove_cb, void *remove_cls)
336 struct GNUNET_HashCode other_hash;
340 if ( 0 == GNUNET_CRYPTO_cmp_peer_identity (other, &(s_elem->peer_id)) )
342 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Got PeerID %s\n",
344 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Have already PeerID %s\n",
345 GNUNET_i2s (&(s_elem->peer_id)));
349 GNUNET_CRYPTO_hmac(&s_elem->auth_key,
351 sizeof(struct GNUNET_PeerIdentity),
354 if ( EMPTY == s_elem->is_empty )
356 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Got PeerID %s; Simply accepting (was empty previously).\n",
358 s_elem->peer_id = *other;
359 s_elem->peer_id_hash = other_hash;
361 if (NULL != sampler->insert_cb)
362 sampler->insert_cb (sampler->insert_cls, &(s_elem->peer_id));
364 s_elem->num_change++;
366 else if ( 0 > GNUNET_CRYPTO_hash_cmp (&other_hash, &s_elem->peer_id_hash) )
368 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Got PeerID %s\n",
370 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Discarding old PeerID %s\n",
371 GNUNET_i2s (&s_elem->peer_id));
373 if ( NULL != sampler->remove_cb )
375 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Removing old PeerID %s with the remove callback.\n",
376 GNUNET_i2s (&s_elem->peer_id));
377 sampler->remove_cb (sampler->remove_cls, &s_elem->peer_id);
380 s_elem->peer_id = *other;
381 s_elem->peer_id_hash = other_hash;
383 if ( NULL != sampler->insert_cb )
385 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Inserting new PeerID %s with the insert callback.\n",
386 GNUNET_i2s (&s_elem->peer_id));
387 sampler->insert_cb(sampler->insert_cls, &s_elem->peer_id);
390 s_elem->num_change++;
394 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Got PeerID %s\n",
396 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Keeping old PeerID %s\n",
397 GNUNET_i2s(&s_elem->peer_id));
400 s_elem->is_empty = NOT_EMPTY;
405 * Grow or shrink the size of the sampler.
407 * @param new_size the new size of the sampler
410 RPS_sampler_resize (unsigned int new_size)
412 unsigned int old_size;
414 struct RPS_SamplerElement **rem_list;
416 // TODO check min and max size
418 old_size = sampler->sampler_size;
420 if (old_size > new_size)
422 /* Temporary store those to properly call the removeCB on those later */
423 rem_list = GNUNET_malloc ((old_size - new_size) * sizeof (struct RPS_SamplerElement *));
425 &sampler->sampler_elements[new_size],
426 (old_size - new_size) * sizeof (struct RPS_SamplerElement *));
428 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Shrinking sampler %d -> %d\n", old_size, new_size);
429 GNUNET_array_grow (sampler->sampler_elements, sampler->sampler_size, new_size);
430 LOG (GNUNET_ERROR_TYPE_DEBUG,
431 "SAMPLER: sampler->sampler_elements now points to %p\n",
432 sampler->sampler_elements);
434 for (i = 0 ; i < old_size - new_size ; i++)
435 {/* Remove unneeded rest */
436 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Removing %" PRIX32 ". sampler\n", i);
437 if (NULL != sampler->remove_cb)
438 sampler->remove_cb (sampler->remove_cls, &rem_list[i]->peer_id);
439 GNUNET_free (rem_list[i]);
441 GNUNET_free (rem_list);
443 else if (old_size < new_size)
445 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Growing sampler %d -> %d\n", old_size, new_size);
446 GNUNET_array_grow (sampler->sampler_elements, sampler->sampler_size, new_size);
447 LOG (GNUNET_ERROR_TYPE_DEBUG,
448 "SAMPLER: sampler->sampler_elements now points to %p\n",
449 sampler->sampler_elements);
451 for ( i = old_size ; i < new_size ; i++ )
452 { /* Add new sampler elements */
453 sampler->sampler_elements[i] = RPS_sampler_elem_create ();
454 if (NULL != sampler->insert_cb)
455 sampler->insert_cb (sampler->insert_cls, &sampler->sampler_elements[i]->peer_id);
456 LOG (GNUNET_ERROR_TYPE_DEBUG,
457 "SAMPLER: Added %" PRIX32 ". sampler, now pointing to %p, contains %s\n",
458 i, &sampler->sampler_elements[i], GNUNET_i2s (&sampler->sampler_elements[i]->peer_id));
463 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Size remains the same -- nothing to do\n");
467 GNUNET_assert(sampler->sampler_size == new_size);
468 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Finished growing/shrinking.\n"); // remove
473 * Initialise a tuple of sampler elements.
475 * @param init_size the size the sampler is initialised with
476 * @param ins_cb the callback that will be called on every PeerID that is
477 * newly inserted into a sampler element
478 * @param ins_cls the closure given to #ins_cb
479 * @param rem_cb the callback that will be called on every PeerID that is
480 * removed from a sampler element
481 * @param rem_cls the closure given to #rem_cb
484 RPS_sampler_init (size_t init_size,
485 struct GNUNET_TIME_Relative max_round_interval,
486 RPS_sampler_insert_cb ins_cb, void *ins_cls,
487 RPS_sampler_remove_cb rem_cb, void *rem_cls)
489 //struct RPS_Sampler *sampler;
492 /* Initialise context around extended sampler */
493 min_size = 10; // TODO make input to _samplers_init()
494 max_size = 1000; // TODO make input to _samplers_init()
496 sampler = GNUNET_new (struct RPS_Sampler);
497 sampler->sampler_size = 0;
498 sampler->sampler_elements = NULL;
499 sampler->max_round_interval = max_round_interval;
500 sampler->insert_cb = ins_cb;
501 sampler->insert_cls = ins_cls;
502 sampler->remove_cb = rem_cb;
503 sampler->remove_cls = rem_cls;
504 get_peer_tasks = GNUNET_CONTAINER_multihashmap_create (4, GNUNET_NO);
505 //sampler->sampler_elements = GNUNET_new_array(init_size, struct GNUNET_PeerIdentity);
506 //GNUNET_array_grow (sampler->sampler_elements, sampler->sampler_size, min_size);
507 RPS_sampler_resize (init_size);
509 client_get_index = 0;
511 //GNUNET_assert (init_size == sampler->sampler_size);
516 * A fuction to update every sampler in the given list
518 * @param id the PeerID that is put in the sampler
521 RPS_sampler_update_list (const struct GNUNET_PeerIdentity *id)
525 for ( i = 0 ; i < sampler->sampler_size ; i++ )
526 RPS_sampler_elem_next (sampler->sampler_elements[i], id,
527 sampler->insert_cb, sampler->insert_cls,
528 sampler->remove_cb, sampler->remove_cls);
533 * Reinitialise all previously initialised sampler elements with the given value.
535 * Used to get rid of a PeerID.
537 * @param id the id of the sampler elements to update.
540 RPS_sampler_reinitialise_by_value (const struct GNUNET_PeerIdentity *id)
544 for ( i = 0 ; i < sampler->sampler_size ; i++ )
546 if ( 0 == GNUNET_CRYPTO_cmp_peer_identity(id, &(sampler->sampler_elements[i]->peer_id)) )
548 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Reinitialising sampler\n");
549 RPS_sampler_elem_reinit (sampler->sampler_elements[i]);
556 * Get one random peer out of the sampled peers.
558 * We might want to reinitialise this sampler after giving the
559 * corrsponding peer to the client.
560 * Only used internally
563 RPS_sampler_get_rand_peer_ (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
565 struct GetPeerCls *gpc;
567 struct GNUNET_HashCode *hash;
569 gpc = (struct GetPeerCls *) cls;
572 * Choose the r_index of the peer we want to return
573 * at random from the interval of the gossip list
575 r_index = GNUNET_CRYPTO_random_u64(GNUNET_CRYPTO_QUALITY_STRONG,
576 sampler->sampler_size);
578 if ( EMPTY == sampler->sampler_elements[r_index]->is_empty )
580 gpc->get_peer_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply(
581 GNUNET_TIME_UNIT_SECONDS,
583 &RPS_sampler_get_rand_peer_,
588 *gpc->id = sampler->sampler_elements[r_index]->peer_id;
590 hash = GNUNET_new (struct GNUNET_HashCode);
591 GNUNET_CRYPTO_hash (&gpc->get_peer_task, sizeof (struct GNUNET_SCHEDULER_Task *), hash);
592 if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_remove (get_peer_tasks, hash, &gpc->get_peer_task))
593 LOG (GNUNET_ERROR_TYPE_WARNING, "SAMPLER: Key to remove is not in the hashmap\n");
594 GNUNET_free (gpc->get_peer_task);
596 gpc->cb (gpc->cb_cls, gpc->id);
601 * Get one random peer out of the sampled peers.
603 * We might want to reinitialise this sampler after giving the
604 * corrsponding peer to the client.
606 * @return a random PeerID of the PeerIDs previously put into the sampler.
609 RPS_sampler_get_rand_peer (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
611 struct GetPeerCls *gpc;
612 struct GNUNET_PeerIdentity tmp_id;
613 struct RPS_SamplerElement *s_elem;
614 struct GNUNET_TIME_Relative last_request_diff;
615 struct GNUNET_HashCode *hash;
616 uint32_t tmp_client_get_index;
618 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Single peer was requested\n");
620 gpc = (struct GetPeerCls *) cls;
621 hash = GNUNET_new (struct GNUNET_HashCode);
623 /* Store the next #client_get_index to check whether we cycled over the whole list */
624 if (0 < client_get_index)
625 tmp_client_get_index = client_get_index - 1;
627 tmp_client_get_index = sampler->sampler_size - 1;
629 LOG (GNUNET_ERROR_TYPE_DEBUG,
630 "SAMPLER: scheduling for later if index reaches %" PRIX32 " (sampler size: %" PRIX32 ").\n",
631 tmp_client_get_index, sampler->sampler_size);
634 { /* Get first non empty sampler */
635 if (tmp_client_get_index == client_get_index)
637 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: reached tmp_index %" PRIX32 ".\n", client_get_index);
638 gpc->get_peer_task = GNUNET_SCHEDULER_add_delayed (sampler->max_round_interval,
639 &RPS_sampler_get_rand_peer,
644 tmp_id = sampler->sampler_elements[client_get_index]->peer_id;
645 RPS_sampler_elem_reinit (sampler->sampler_elements[client_get_index]);
646 RPS_sampler_elem_next (sampler->sampler_elements[client_get_index], &tmp_id,
647 NULL, NULL, NULL, NULL);
649 /* Cycle the #client_get_index one step further */
650 if ( client_get_index == sampler->sampler_size - 1 )
651 client_get_index = 0;
655 LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: incremented index to %" PRIX32 ".\n", client_get_index);
656 } while (EMPTY == sampler->sampler_elements[client_get_index]->is_empty);
658 s_elem = sampler->sampler_elements[client_get_index];
659 *gpc->id = s_elem->peer_id;
661 /* Check whether we may use this sampler to give it back to the client */
662 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us != s_elem->last_client_request.abs_value_us)
664 last_request_diff = GNUNET_TIME_absolute_get_difference (s_elem->last_client_request,
665 GNUNET_TIME_absolute_get ());
666 /* We're not going to give it back now if it was already requested by a client this round */
667 if (last_request_diff.rel_value_us < sampler->max_round_interval.rel_value_us)
669 LOG (GNUNET_ERROR_TYPE_DEBUG,
670 "SAMPLER: Last client request on this sampler was less than max round interval ago -- scheduling for later\n");
671 ///* How many time remains untile the next round has started? */
672 //inv_last_request_diff = GNUNET_TIME_absolute_get_difference (last_request_diff,
673 // sampler->max_round_interval);
674 // add a little delay
675 /* Schedule it one round later */
676 gpc->get_peer_task = GNUNET_SCHEDULER_add_delayed (sampler->max_round_interval,
677 &RPS_sampler_get_rand_peer,
681 // TODO add other reasons to wait here
684 GNUNET_CRYPTO_hash (&gpc->get_peer_task, sizeof (struct GNUNET_SCHEDULER_Task *), hash);
685 if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_remove (get_peer_tasks, hash, &gpc->get_peer_task))
686 LOG (GNUNET_ERROR_TYPE_WARNING, "SAMPLER: Key to remove is not in the hashmap\n");
687 GNUNET_free (gpc->get_peer_task);
689 s_elem->last_client_request = GNUNET_TIME_absolute_get ();
691 gpc->cb (gpc->cb_cls, gpc->id);
696 * Get n random peers out of the sampled peers.
698 * We might want to reinitialise this sampler after giving the
699 * corrsponding peer to the client.
700 * Random with or without consumption?
702 * @param cb callback that will be called once the ids are ready.
703 * @param cls closure given to @a cb
704 * @param for_client #GNUNET_YES if result is used for client,
705 * #GNUNET_NO if used internally
706 * @param num_peers the number of peers requested
709 RPS_sampler_get_n_rand_peers (RPS_sampler_n_rand_peers_ready_cb cb,
710 void *cls, uint32_t num_peers, int for_client)
712 GNUNET_assert (GNUNET_YES == for_client ||
713 GNUNET_NO == for_client);
714 GNUNET_assert (0 != sampler->sampler_size);
716 // TODO check if we have too much (distinct) sampled peers
718 struct NRandPeersReadyCls *cb_cls;
719 struct GetPeerCls *gpc;
720 struct GNUNET_HashCode *hash;
722 hash = GNUNET_new (struct GNUNET_HashCode);
724 cb_cls = GNUNET_new (struct NRandPeersReadyCls);
725 cb_cls->num_peers = num_peers;
726 cb_cls->cur_num_peers = 0;
727 cb_cls->ids = GNUNET_new_array (num_peers, struct GNUNET_PeerIdentity);
728 cb_cls->callback = cb;
731 LOG (GNUNET_ERROR_TYPE_DEBUG,
732 "SAMPLER: Scheduling requests for %" PRIX32 " peers\n", num_peers);
734 for ( i = 0 ; i < num_peers ; i++ )
736 gpc = GNUNET_new (struct GetPeerCls);
737 gpc->cb = check_n_peers_ready;
738 gpc->cb_cls = cb_cls;
739 gpc->id = &cb_cls->ids[i];
741 // maybe add a little delay
742 if (GNUNET_YES == for_client)
743 gpc->get_peer_task = GNUNET_SCHEDULER_add_now (&RPS_sampler_get_rand_peer, gpc);
744 else if (GNUNET_NO == for_client)
745 gpc->get_peer_task = GNUNET_SCHEDULER_add_now (&RPS_sampler_get_rand_peer_, gpc);
746 GNUNET_CRYPTO_hash (&gpc->get_peer_task, sizeof (struct GNUNET_SCHEDULER_Task *), hash);
747 (void) GNUNET_CONTAINER_multihashmap_put (get_peer_tasks, hash, &gpc->get_peer_task,
748 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
754 * Counts how many Samplers currently hold a given PeerID.
756 * @param id the PeerID to count.
758 * @return the number of occurrences of id.
761 RPS_sampler_count_id (const struct GNUNET_PeerIdentity *id)
767 for ( i = 0 ; i < sampler->sampler_size ; i++ )
769 if ( 0 == GNUNET_CRYPTO_cmp_peer_identity (&sampler->sampler_elements[i]->peer_id, id)
770 && EMPTY != sampler->sampler_elements[i]->is_empty)
778 * Callback to iterate over the hashmap to cancle the get_peer_tasks.
781 clear_get_peer_tasks (void *cls, const struct GNUNET_HashCode *key, void *value)
783 struct GNUNET_SCHEDULER_Task *task;
785 task = (struct GNUNET_SCHEDULER_Task *) value;
786 GNUNET_SCHEDULER_cancel (task);
788 GNUNET_CONTAINER_multihashmap_remove (get_peer_tasks, key, value);
795 * Cleans the sampler.
798 RPS_sampler_destroy ()
800 if (GNUNET_SYSERR == GNUNET_CONTAINER_multihashmap_iterate (get_peer_tasks,
801 clear_get_peer_tasks,
803 LOG (GNUNET_ERROR_TYPE_WARNING, "SAMPLER: iteration over hashmap was cancelled\n");
804 GNUNET_CONTAINER_multihashmap_destroy (get_peer_tasks);
805 RPS_sampler_resize (0);
806 GNUNET_array_grow (sampler->sampler_elements, sampler->sampler_size, 0);
809 /* end of gnunet-service-rps.c */