2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
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22 * @file ats/gnunet-service-ats_normalization.c
23 * @brief ats service address: management of ATS properties and preferences normalization
24 * @author Matthias Wachs
25 * @author Christian Grothoff
28 #include "gnunet_ats_service.h"
29 #include "gnunet-service-ats_addresses.h"
30 #include "gnunet-service-ats_normalization.h"
32 #define LOG(kind,...) GNUNET_log_from (kind, "ats-normalization",__VA_ARGS__)
37 struct PreferenceClient
42 struct PreferenceClient *prev;
48 struct PreferenceClient *next;
56 * Total preference for this peer
58 double f_abs_sum[GNUNET_ATS_PreferenceCount];
61 * List of peer preferences for this client
67 struct PreferencePeer *p_head;
72 struct PreferencePeer *p_tail;
83 struct PreferencePeer *next;
88 struct PreferencePeer *prev;
93 struct PreferenceClient *client;
98 struct GNUNET_PeerIdentity id;
101 * Absolute preference values
103 double f_abs[GNUNET_ATS_PreferenceCount];
106 * Relative preference values
108 double f_rel[GNUNET_ATS_PreferenceCount];
110 struct GNUNET_TIME_Absolute next_aging[GNUNET_ATS_PreferenceCount];
114 * Relative preferences for a peer
119 * Relative preference values
121 double f_rel[GNUNET_ATS_PreferenceCount];
126 struct GNUNET_PeerIdentity id;
130 * Callback to call on changing preference values
132 static GAS_Normalization_preference_changed_cb pref_changed_cb;
135 * Closure for callback to call on changing preference values
137 static void *pref_changed_cb_cls;
140 * Callback to call on changing property values
142 GAS_Normalization_property_changed_cb prop_ch_cb;
145 * Closure for callback to call on changing property values
147 void *prop_ch_cb_cls;
150 * Hashmap to store peer information for preference normalization
152 static struct GNUNET_CONTAINER_MultiPeerMap *preference_peers;
155 * Hashmap to store peer information for property normalization
156 * FIXME: this map is not used!
158 static struct GNUNET_CONTAINER_MultiPeerMap *property_peers;
161 * Clients in DLL: head
163 static struct PreferenceClient *pc_head;
166 * Clients in DLL: tail
168 static struct PreferenceClient *pc_tail;
173 static struct PeerRelative defvalues;
175 static GNUNET_SCHEDULER_TaskIdentifier aging_task;
178 * Application Preference Normalization
184 * @param kind the kind
185 * @return the new relative preference
188 update_peers (struct GNUNET_PeerIdentity *id,
189 enum GNUNET_ATS_PreferenceKind kind)
191 struct PreferenceClient *c_cur;
192 struct PreferencePeer *p_cur;
193 struct PeerRelative *rp;
201 /* For all clients */
202 for (c_cur = pc_head; NULL != c_cur; c_cur = c_cur->next)
204 /* Find peer with id */
205 for (p_cur = c_cur->p_head; NULL != p_cur; p_cur = p_cur->next)
207 if (0 == memcmp (id, &p_cur->id, sizeof(struct GNUNET_PeerIdentity)))
212 /* Found peer with id */
213 f_rel_total += p_cur->f_rel[kind];
219 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
220 "%u clients have a total relative preference for peer `%s''s `%s' of %.3f\n",
221 count, GNUNET_i2s (id), GNUNET_ATS_print_preference_type (kind),
224 != (rp = GNUNET_CONTAINER_multipeermap_get (preference_peers,
227 backup = rp->f_rel[kind];
230 rp->f_rel[kind] = f_rel_total / count;
234 rp->f_rel[kind] = DEFAULT_REL_PREFERENCE;
239 return DEFAULT_REL_PREFERENCE;
242 if ((backup != rp->f_rel[kind]) && (NULL != pref_changed_cb))
244 pref_changed_cb (pref_changed_cb_cls, &rp->id, kind, rp->f_rel[kind]);
247 return rp->f_rel[kind];
251 * Recalculate preference for a specific ATS property
253 * @param c the preference client
255 * @param kind the preference kind
259 recalculate_rel_preferences (struct PreferenceClient *c,
260 struct PreferencePeer *p, enum GNUNET_ATS_PreferenceKind kind)
262 struct PreferencePeer *p_cur;
263 struct PeerRelative *rp;
268 /* For this client: sum preferences to total preference */
269 c->f_abs_sum[kind] = 0;
270 for (p_cur = c->p_head; NULL != p_cur; p_cur = p_cur->next)
271 c->f_abs_sum[kind] += p_cur->f_abs[kind];
272 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
273 "Client %p has total preference for %s of %.3f\n", c->client,
274 GNUNET_ATS_print_preference_type (kind), c->f_abs_sum[kind]);
276 ret = DEFAULT_REL_PREFERENCE;
277 /* For all peers: calculate relative preference */
278 for (p_cur = c->p_head; NULL != p_cur; p_cur = p_cur->next)
280 /* Calculate relative preference for specific kind */
281 backup = p_cur->f_rel[kind];
282 if (DEFAULT_ABS_PREFERENCE == c->f_abs_sum[kind])
283 /* No peer has a preference for this property,
284 * so set default preference */
285 p_cur->f_rel[kind] = DEFAULT_REL_PREFERENCE;
287 p_cur->f_rel[kind] = (c->f_abs_sum[kind] + p_cur->f_abs[kind])
288 / c->f_abs_sum[kind];
290 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
291 "Client %p: peer `%s' has relative preference for %s of %.3f\n",
292 c->client, GNUNET_i2s (&p_cur->id),
293 GNUNET_ATS_print_preference_type (kind), p_cur->f_rel[kind]);
295 if (p_cur->f_rel[kind] != backup)
297 /* Value changed, recalculate */
298 res = update_peers (&p_cur->id, kind);
299 if (0 == memcmp (&p->id, &p_cur->id, sizeof(struct GNUNET_PeerIdentity)))
304 /* Value did not chang, return old value*/
306 NULL != (rp = GNUNET_CONTAINER_multipeermap_get (preference_peers, &p->id)));
307 ret = rp->f_rel[kind];
314 * Update the absolute preference value for a peer
315 * @param c the client
317 * @param kind the preference kind
318 * @param score_abs the absolute value
319 * @return the new relative preference value
322 update_preference (struct PreferenceClient *c, struct PreferencePeer *p,
323 enum GNUNET_ATS_PreferenceKind kind, float score_abs)
325 double score = score_abs;
327 /* Update preference value according to type */
330 case GNUNET_ATS_PREFERENCE_BANDWIDTH:
331 case GNUNET_ATS_PREFERENCE_LATENCY:
332 p->f_abs[kind] = (p->f_abs[kind] + score) / 2;
333 p->next_aging[kind] = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get(),
334 PREF_AGING_INTERVAL);
336 case GNUNET_ATS_PREFERENCE_END:
341 return recalculate_rel_preferences (c, p, kind);
345 * Reduce absolute preferences since they got old
347 * @param cls the PreferencePeer
351 preference_aging (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
353 struct PreferencePeer *p;
354 struct PreferenceClient *cur_client;
356 int values_to_update;
359 aging_task = GNUNET_SCHEDULER_NO_TASK;
360 values_to_update = 0;
363 for (cur_client = pc_head; NULL != cur_client; cur_client = cur_client->next)
365 for (p = cur_client->p_head; NULL != p; p = p->next)
367 /* Aging absolute values: */
368 for (i = 0; i < GNUNET_ATS_PreferenceCount; i++)
370 if (0 == GNUNET_TIME_absolute_get_remaining(p->next_aging[i]).rel_value_us)
372 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Aging preference for peer `%s'\n",
373 GNUNET_i2s (&p->id));
374 backup = p->f_abs[i];
375 if (p->f_abs[i] > DEFAULT_ABS_PREFERENCE)
376 p->f_abs[i] *= PREF_AGING_FACTOR;
377 if (p->f_abs[i] <= DEFAULT_ABS_PREFERENCE + PREF_EPSILON)
378 p->f_abs[i] = DEFAULT_ABS_PREFERENCE;
379 if ((p->f_abs[i] != DEFAULT_ABS_PREFERENCE) && (backup != p->f_abs[i]))
381 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
382 "Aged preference for peer `%s' from %.3f to %.3f\n",
383 GNUNET_i2s (&p->id), backup, p->f_abs[i]);
384 recalculate_rel_preferences (p->client, p, i);
385 p->next_aging[i] = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(),
386 PREF_AGING_INTERVAL);
394 if (values_to_update > 0)
396 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
397 "Rescheduling aging task due to %u elements to age\n", values_to_update);
398 aging_task = GNUNET_SCHEDULER_add_delayed (PREF_AGING_INTERVAL,
399 &preference_aging, NULL);
402 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
403 "No values to age left, not rescheduling aging task\n");
408 * Normalize an updated preference value
410 * @param src the client with this preference
411 * @param peer the peer to change the preference for
412 * @param kind the kind to change the preference
413 * @param score_abs the normalized score
416 GAS_normalization_normalize_preference (void *src,
417 const struct GNUNET_PeerIdentity *peer,
418 enum GNUNET_ATS_PreferenceKind kind,
421 struct PreferenceClient *c_cur;
422 struct PreferencePeer *p_cur;
423 struct PeerRelative *r_cur;
426 GNUNET_assert(NULL != src);
427 GNUNET_assert(NULL != peer);
429 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
430 "Client %p changes preference for peer `%s' for `%s' to %.2f\n", src,
431 GNUNET_i2s (peer), GNUNET_ATS_print_preference_type (kind), score_abs);
433 if (kind >= GNUNET_ATS_PreferenceCount)
439 /* Find preference client */
440 for (c_cur = pc_head; NULL != c_cur; c_cur = c_cur->next)
442 if (src == c_cur->client)
445 /* Not found: create new preference client */
448 c_cur = GNUNET_malloc (sizeof (struct PreferenceClient));
450 GNUNET_CONTAINER_DLL_insert (pc_head, pc_tail, c_cur);
451 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
452 "Adding new client %p \n", c_cur);
455 /* Find entry for peer */
456 for (p_cur = c_cur->p_head; NULL != p_cur; p_cur = p_cur->next)
457 if (0 == memcmp (&p_cur->id, peer, sizeof(p_cur->id)))
460 /* Not found: create new peer entry */
463 p_cur = GNUNET_malloc (sizeof (struct PreferencePeer));
464 p_cur->client = c_cur;
466 for (i = 0; i < GNUNET_ATS_PreferenceCount; i++)
468 /* Default value per peer absolut preference for a quality:
469 * No value set, so absolute preference 0 */
470 p_cur->f_abs[i] = DEFAULT_ABS_PREFERENCE;
471 /* Default value per peer relative preference for a quality: 1.0 */
472 p_cur->f_rel[i] = DEFAULT_REL_PREFERENCE;
473 p_cur->next_aging[i] = GNUNET_TIME_UNIT_FOREVER_ABS;
475 GNUNET_CONTAINER_DLL_insert(c_cur->p_head, c_cur->p_tail, p_cur);
478 if (NULL == GNUNET_CONTAINER_multipeermap_get (preference_peers,
481 r_cur = GNUNET_malloc (sizeof (struct PeerRelative));
483 for (i = 0; i < GNUNET_ATS_PreferenceCount; i++)
484 r_cur->f_rel[i] = DEFAULT_REL_PREFERENCE;
485 GNUNET_CONTAINER_multipeermap_put (preference_peers, &r_cur->id,
486 r_cur, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
489 if (GNUNET_SCHEDULER_NO_TASK == aging_task)
490 aging_task = GNUNET_SCHEDULER_add_delayed (PREF_AGING_INTERVAL,
491 &preference_aging, NULL);
493 update_preference (c_cur, p_cur, kind, score_abs);
497 * Get the normalized preference values for a specific peer or
498 * the default values if
501 * @return pointer to the values, can be indexed with GNUNET_ATS_PreferenceKind,
502 * default preferences if peer does not exist
505 GAS_normalization_get_preferences (const struct GNUNET_PeerIdentity *id)
507 GNUNET_assert(NULL != preference_peers);
508 GNUNET_assert(NULL != id);
510 struct PeerRelative *rp;
512 == (rp = GNUNET_CONTAINER_multipeermap_get (preference_peers,
515 return defvalues.f_rel;
521 * Get the normalized properties values for a specific peer or
522 * the default values if
524 * @param address the address
525 * @return pointer to the values, can be indexed with GNUNET_ATS_PreferenceKind,
526 * default preferences if peer does not exist
529 GAS_normalization_get_properties (struct ATS_Address *address)
531 static double norm_values[GNUNET_ATS_QualityPropertiesCount];
534 GNUNET_assert(NULL != address);
536 for (i = 0; i < GNUNET_ATS_QualityPropertiesCount; i++)
538 if ((address->atsin[i].norm >= 1.0) && (address->atsin[i].norm <= 2.0))
539 norm_values[i] = address->atsin[i].norm;
541 norm_values[i] = DEFAULT_REL_QUALITY;
547 * Quality Normalization
558 struct Property properties[GNUNET_ATS_QualityPropertiesCount];
561 * Normalize a specific ATS type with the values in queue
562 * @param address the address
563 * @param atsi the ats information
564 * @return the new average or GNUNET_ATS_VALUE_UNDEFINED
568 property_average (struct ATS_Address *address,
569 const struct GNUNET_ATS_Information *atsi)
571 struct GAS_NormalizationInfo *ni;
572 uint32_t current_type;
573 uint32_t current_val;
579 unsigned int props[] = GNUNET_ATS_QualityProperties;
581 /* Average the values of this property */
582 current_type = ntohl (atsi->type);
583 current_val = ntohl (atsi->value);
585 for (c1 = 0; c1 < GNUNET_ATS_QualityPropertiesCount; c1++)
587 if (current_type == props[c1])
590 if (c1 == GNUNET_ATS_QualityPropertiesCount)
593 return GNUNET_ATS_VALUE_UNDEFINED;
597 ni = &address->atsin[index];
598 ni->atsi_abs[ni->avg_queue_index] = current_val;
599 ni->avg_queue_index++;
600 if (GAS_normalization_queue_length == ni->avg_queue_index)
601 ni->avg_queue_index = 0;
605 for (c1 = 0; c1 < GAS_normalization_queue_length; c1++)
607 if (GNUNET_ATS_VALUE_UNDEFINED != ni->atsi_abs[c1])
610 if (GNUNET_ATS_VALUE_UNDEFINED > (sum + ni->atsi_abs[c1]))
611 sum += ni->atsi_abs[c1];
614 sum = GNUNET_ATS_VALUE_UNDEFINED - 1;
619 GNUNET_assert(0 != count);
621 LOG(GNUNET_ERROR_TYPE_DEBUG,
622 "New average of `%s' created by adding %u from %u elements: %u\n",
623 GNUNET_ATS_print_property_type (current_type), current_val, count, res,
639 find_min_max_it (void *cls,
640 const struct GNUNET_PeerIdentity *h,
643 struct FindMinMaxCtx *find_res = cls;
644 struct ATS_Address *a = k;
646 if (a->atsin[find_res->p->prop_type].avg > find_res->max)
647 find_res->max = a->atsin[find_res->p->prop_type].avg;
649 if (a->atsin[find_res->p->prop_type].avg < find_res->min)
650 find_res->min = a->atsin[find_res->p->prop_type].avg;
657 normalize_address (void *cls,
658 const struct GNUNET_PeerIdentity *h,
661 struct Property *p = cls;
662 struct ATS_Address *address = k;
665 uint32_t avg_value = address->atsin[p->prop_type].avg;
667 delta = p->max - p->min;
668 address->atsin[p->prop_type].norm = (delta + (avg_value - p->min)) / (delta);
670 LOG(GNUNET_ERROR_TYPE_DEBUG,
671 "Normalize `%s' address %p's '%s' with value %u to range [%u..%u] = %.3f\n",
672 GNUNET_i2s (&address->peer), address,
673 GNUNET_ATS_print_property_type (p->atsi_type),
674 address->atsin[p->prop_type].avg, p->min, p->max,
675 address->atsin[p->prop_type].norm);
677 if (NULL != prop_ch_cb)
678 prop_ch_cb (prop_ch_cb_cls, address, p->atsi_type,
679 address->atsin[p->prop_type].norm);
686 * Normalize avg_value to a range of values between [1.0, 2.0]
687 * based on min max values currently known.
689 * @param addresses the address hashmap
690 * @param p the property
691 * @param address the address
692 * @param avg_value the value to normalize
695 property_normalize (struct GNUNET_CONTAINER_MultiPeerMap *addresses,
697 struct ATS_Address *address,
700 struct FindMinMaxCtx find_ctx;
706 find_ctx.min = UINT32_MAX;
707 addr_count = GNUNET_CONTAINER_multipeermap_iterate (addresses,
708 &find_min_max_it, &find_ctx);
715 limits_changed = GNUNET_NO;
716 if (find_ctx.max != p->max)
718 LOG(GNUNET_ERROR_TYPE_DEBUG,
719 "Normalizing %s: new maximum %u -> recalculate all values\n",
720 GNUNET_ATS_print_property_type (p->atsi_type), find_ctx.max);
721 p->max = find_ctx.max;
722 limits_changed = GNUNET_YES;
725 if ((find_ctx.min != p->min) && (find_ctx.min < p->max))
727 LOG(GNUNET_ERROR_TYPE_DEBUG,
728 "Normalizing %s: new minimum %u -> recalculate all values\n",
729 GNUNET_ATS_print_property_type (p->atsi_type), find_ctx.min,
731 p->min = find_ctx.min;
732 limits_changed = GNUNET_YES;
734 else if (find_ctx.min == p->max)
736 /* Only one value, so minimum has to be 0 */
740 /* Normalize the values of this property */
741 if (GNUNET_NO == limits_changed)
743 /* normalize just this address */
744 normalize_address (p, &address->peer, address);
749 /* limits changed, normalize all addresses */
750 GNUNET_CONTAINER_multipeermap_iterate (addresses, &normalize_address, p);
756 * Update and normalize atsi performance information
758 * @param addresses hashmap containing all addresses
759 * @param address the address to update
760 * @param atsi the array of performance information
761 * @param atsi_count the number of atsi information in the array
764 GAS_normalization_normalize_property (struct GNUNET_CONTAINER_MultiPeerMap *addresses,
765 struct ATS_Address *address,
766 const struct GNUNET_ATS_Information *atsi,
769 struct Property *cur_prop;
772 uint32_t current_type;
773 uint32_t current_val;
774 unsigned int existing_properties[] = GNUNET_ATS_QualityProperties;
776 GNUNET_assert(NULL != address);
777 GNUNET_assert(NULL != atsi);
779 LOG(GNUNET_ERROR_TYPE_DEBUG, "Updating %u elements for peer `%s'\n",
780 atsi_count, GNUNET_i2s (&address->peer));
782 for (c1 = 0; c1 < atsi_count; c1++)
784 current_type = ntohl (atsi[c1].type);
786 for (c2 = 0; c2 < GNUNET_ATS_QualityPropertiesCount; c2++)
788 /* Check if type is valid */
789 if (current_type == existing_properties[c2])
792 if (GNUNET_ATS_QualityPropertiesCount == c2)
794 /* Invalid property, continue with next element */
798 current_val = property_average (address, &atsi[c1]);
799 if (GNUNET_ATS_VALUE_UNDEFINED == current_val)
807 cur_prop = &properties[c2];
808 property_normalize (addresses, cur_prop, address, current_val);
813 * Start the normalization component
815 * @param pref_ch_cb callback to call on relative preference changing
816 * @param pref_ch_cb_cls cls for the preference callback
817 * @param property_ch_cb callback to call on relative property changing
818 * @param property_ch_cb_cls cls for the property callback
821 GAS_normalization_start (GAS_Normalization_preference_changed_cb pref_ch_cb,
822 void *pref_ch_cb_cls, GAS_Normalization_property_changed_cb property_ch_cb,
823 void *property_ch_cb_cls)
827 preference_peers = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
828 property_peers = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
829 unsigned int existing_properties[] = GNUNET_ATS_QualityProperties;
831 for (c1 = 0; c1 < GNUNET_ATS_QualityPropertiesCount; c1++)
833 properties[c1].prop_type = c1;
834 properties[c1].atsi_type = existing_properties[c1];
835 properties[c1].min = 0;
836 properties[c1].max = 0;
839 pref_changed_cb = pref_ch_cb;
840 pref_changed_cb_cls = pref_ch_cb_cls;
841 prop_ch_cb = property_ch_cb;
842 prop_ch_cb_cls = pref_ch_cb_cls;
847 for (i = 0; i < GNUNET_ATS_PreferenceCount; i++)
848 defvalues.f_rel[i] = DEFAULT_REL_PREFERENCE;
849 aging_task = GNUNET_SCHEDULER_NO_TASK;
859 * @param value RelativePeer
860 * @return #GNUNET_OK to continue
863 free_peer (void *cls, const struct GNUNET_PeerIdentity *key, void *value)
865 struct PeerRelative *rp = value;
867 == GNUNET_CONTAINER_multipeermap_remove (preference_peers, key, value))
875 * Stop the normalization component and free all items
878 GAS_normalization_stop ()
880 struct PreferenceClient *pc;
881 struct PreferenceClient *next_pc;
882 struct PreferencePeer *p;
883 struct PreferencePeer *next_p;
885 if (GNUNET_SCHEDULER_NO_TASK != aging_task)
887 GNUNET_SCHEDULER_cancel (aging_task);
888 aging_task = GNUNET_SCHEDULER_NO_TASK;
892 while (NULL != (pc = next_pc))
895 GNUNET_CONTAINER_DLL_remove(pc_head, pc_tail, pc);
897 while (NULL != (p = next_p))
900 GNUNET_CONTAINER_DLL_remove(pc->p_head, pc->p_tail, p);
906 GNUNET_CONTAINER_multipeermap_iterate (preference_peers, &free_peer, NULL );
907 GNUNET_CONTAINER_multipeermap_destroy (preference_peers);
908 GNUNET_CONTAINER_multipeermap_destroy (property_peers);
912 /* end of gnunet-service-ats_normalization.c */