2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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22 * @file ats/gnunet-service-ats_addresses_simplistic.h
23 * @brief ats simplistic ressource assignment
24 * @author Matthias Wachs
25 * @author Christian Grothoff
28 #include "gnunet_util_lib.h"
29 #include "gnunet-service-ats_addresses.h"
30 #include "gnunet_statistics_service.h"
32 #define LOG(kind,...) GNUNET_log_from (kind, "ats-simplistic",__VA_ARGS__)
35 * ATS simplistic solver
37 * Assigns in and outbound bandwidth equally for all addresses in specific
38 * network type (WAN, LAN) based on configured in and outbound quota for this
41 * For each peer only a single is selected and marked as "active" in the address
46 * You have the networks WAN and LAN and quotas
47 * WAN_TOTAL_IN, WAN_TOTAL_OUT
48 * LAN_TOTAL_IN, LAN_TOTAL_OUT
50 * If you have x addresses in the network segment LAN, the quotas are
51 * QUOTA_PER_ADDRESS = LAN_TOTAL_OUT / x
53 * Quotas are automatically recalculated and reported back when addresses are
58 #define DEFAULT_PREFERENCE 1.0
59 #define MIN_UPDATE_INTERVAL GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
62 * A handle for the simplistic solver
64 struct GAS_SIMPLISTIC_Handle
70 struct GNUNET_STATISTICS_Handle *stats;
73 * Total number of addresses for solver
75 unsigned int total_addresses;
78 * Number of active addresses for solver
80 unsigned int active_addresses;
85 struct Network *network_entries;
90 unsigned int networks;
95 GAS_bandwidth_changed_cb bw_changed;
100 void *bw_changed_cls;
102 struct GNUNET_CONTAINER_MultiHashMap *prefs;
104 struct PreferenceClient *pc_head;
105 struct PreferenceClient *pc_tail;
116 * Network description
121 * Total inbound quota
124 unsigned long long total_quota_in;
127 * Total outbound quota
130 unsigned long long total_quota_out;
133 * Number of active addresses for this network
135 unsigned int active_addresses;
138 * Number of total addresses for this network
140 unsigned int total_addresses;
143 * String for statistics total addresses
148 * String for statistics active addresses
152 struct AddressWrapper *head;
153 struct AddressWrapper *tail;
156 struct AddressWrapper
158 struct AddressWrapper *next;
159 struct AddressWrapper *prev;
161 struct ATS_Address *addr;
165 struct PreferencePeer
167 struct PreferencePeer *next;
168 struct PreferencePeer *prev;
169 struct GNUNET_PeerIdentity id;
171 float f[GNUNET_ATS_PreferenceCount];
172 float f_rel[GNUNET_ATS_PreferenceCount];
176 struct PreferenceClient
178 struct PreferenceClient *prev;
179 struct PreferenceClient *next;
182 float f_total[GNUNET_ATS_PreferenceCount];
184 struct PreferencePeer *p_head;
185 struct PreferencePeer *p_tail;
190 * Get the prefered address for a specific peer
192 * @param solver the solver handle
193 * @param addresses the address hashmap containing all addresses
194 * @param peer the identity of the peer
196 const struct ATS_Address *
197 GAS_simplistic_get_preferred_address (void *solver,
198 struct GNUNET_CONTAINER_MultiHashMap * addresses,
199 const struct GNUNET_PeerIdentity *peer);
202 * Init the simplistic problem solving component
205 * network[i] contains the network type as type GNUNET_ATS_NetworkType[i]
206 * out_quota[i] contains outbound quota for network type i
207 * in_quota[i] contains inbound quota for network type i
210 * network = {GNUNET_ATS_NET_UNSPECIFIED, GNUNET_ATS_NET_LOOPBACK, GNUNET_ATS_NET_LAN, GNUNET_ATS_NET_WAN, GNUNET_ATS_NET_WLAN}
211 * network[2] == GNUNET_ATS_NET_LAN
212 * out_quota[2] == 65353
213 * in_quota[2] == 65353
215 * @param cfg configuration handle
216 * @param stats the GNUNET_STATISTICS handle
217 * @param network array of GNUNET_ATS_NetworkType with length dest_length
218 * @param out_quota array of outbound quotas
219 * @param in_quota array of outbound quota
220 * @param dest_length array length for quota arrays
221 * @param bw_changed_cb callback for changed bandwidth amounts
222 * @param bw_changed_cb_cls cls for callback
223 * @return handle for the solver on success, NULL on fail
226 GAS_simplistic_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
227 const struct GNUNET_STATISTICS_Handle *stats,
229 unsigned long long *out_quota,
230 unsigned long long *in_quota,
232 GAS_bandwidth_changed_cb bw_changed_cb,
233 void *bw_changed_cb_cls)
236 struct GAS_SIMPLISTIC_Handle *s = GNUNET_malloc (sizeof (struct GAS_SIMPLISTIC_Handle));
237 struct Network * cur;
238 char * net_str[GNUNET_ATS_NetworkTypeCount] = GNUNET_ATS_NetworkTypeString;
241 s->stats = (struct GNUNET_STATISTICS_Handle *) stats;
242 s->bw_changed = bw_changed_cb;
243 s->bw_changed_cls = bw_changed_cb_cls;
244 s->networks = dest_length;
245 s->network_entries = GNUNET_malloc (dest_length * sizeof (struct Network));
246 s->active_addresses = 0;
247 s->total_addresses = 0;
248 s->prefs = GNUNET_CONTAINER_multihashmap_create (10, GNUNET_NO);
250 for (c = 0; c < dest_length; c++)
252 cur = &s->network_entries[c];
253 cur->total_addresses = 0;
254 cur->active_addresses = 0;
255 cur->type = network[c];
256 cur->total_quota_in = in_quota[c];
257 cur->total_quota_out = out_quota[c];
258 cur->desc = net_str[c];
259 GNUNET_asprintf (&cur->stat_total, "# ATS addresses %s total", cur->desc);
260 GNUNET_asprintf (&cur->stat_active, "# ATS active addresses %s total", cur->desc);
266 free_pref (void *cls,
267 const struct GNUNET_HashCode * key,
276 * Shutdown the simplistic problem solving component
278 * @param solver the respective handle to shutdown
281 GAS_simplistic_done (void *solver)
283 struct GAS_SIMPLISTIC_Handle *s = solver;
284 struct PreferenceClient *pc;
285 struct PreferenceClient *next_pc;
286 struct PreferencePeer *p;
287 struct PreferencePeer *next_p;
288 struct AddressWrapper *cur;
289 struct AddressWrapper *next;
291 GNUNET_assert (s != NULL);
293 for (c = 0; c < s->networks; c++)
295 if (s->network_entries[c].total_addresses > 0)
297 LOG (GNUNET_ERROR_TYPE_ERROR,
298 "Had %u addresses for network `%s' not deleted during shutdown\n",
299 s->network_entries[c].total_addresses,
300 s->network_entries[c].desc);
304 if (s->network_entries[c].active_addresses > 0)
306 LOG (GNUNET_ERROR_TYPE_ERROR,
307 "Had %u active addresses for network `%s' not deleted during shutdown\n",
308 s->network_entries[c].active_addresses,
309 s->network_entries[c].desc);
313 next = s->network_entries[c].head;
314 while (NULL != (cur = next))
317 GNUNET_CONTAINER_DLL_remove (s->network_entries[c].head,
318 s->network_entries[c].tail,
322 GNUNET_free (s->network_entries[c].stat_total);
323 GNUNET_free (s->network_entries[c].stat_active);
325 if (s->total_addresses > 0)
327 LOG (GNUNET_ERROR_TYPE_ERROR,
328 "Had %u addresses not deleted during shutdown\n",
332 if (s->active_addresses > 0)
334 LOG (GNUNET_ERROR_TYPE_ERROR,
335 "Had %u active addresses not deleted during shutdown\n",
336 s->active_addresses);
339 GNUNET_free (s->network_entries);
341 next_pc = s->pc_head;
342 while (NULL != (pc = next_pc))
345 GNUNET_CONTAINER_DLL_remove (s->pc_head, s->pc_tail, pc);
347 while (NULL != (p = next_p))
350 GNUNET_CONTAINER_DLL_remove (pc->p_head, pc->p_tail, p);
356 GNUNET_CONTAINER_multihashmap_iterate (s->prefs, &free_pref, NULL);
357 GNUNET_CONTAINER_multihashmap_destroy (s->prefs);
363 * Test if bandwidth is available in this network
365 * @param s the solver handle
366 * @param net the network type to update
367 * @return GNUNET_YES or GNUNET_NO
371 bw_available_in_network (struct Network *net)
373 unsigned int na = net->active_addresses + 1;
374 uint32_t min_bw = ntohl (GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT.value__);
375 if (((net->total_quota_in / na) > min_bw) &&
376 ((net->total_quota_out / na) > min_bw))
378 LOG (GNUNET_ERROR_TYPE_DEBUG,
379 "Enough bandwidth available for %u active addresses in network `%s'\n",
385 LOG (GNUNET_ERROR_TYPE_DEBUG,
386 "Not enough bandwidth available for %u active addresses in network `%s'\n",
393 * Update the quotas for a network type
395 * @param s the solver handle
396 * @param net the network type to update
397 * @param address_except address excluded from notifcation, since we suggest
401 update_quota_per_network (struct GAS_SIMPLISTIC_Handle *s,
403 struct ATS_Address *address_except)
405 unsigned long long quota_in = 0;
406 unsigned long long quota_out = 0;
407 struct AddressWrapper *cur;
409 LOG (GNUNET_ERROR_TYPE_DEBUG,
410 "Recalculate quota for network type `%s' for %u addresses (in/out): %llu/%llu \n",
411 net->desc, net->active_addresses, quota_in, quota_out);
413 if (net->active_addresses == 0)
414 return; /* no addresses to update */
418 * Assign every peer in network minimum Bandwidth
419 * Distribute bandwidth left according to preference
421 unsigned long long remaining_quota_in = 0;
422 unsigned long long quota_out_used = 0;
424 unsigned long long remaining_quota_out = 0;
425 unsigned long long quota_in_used = 0;
426 uint32_t min_bw = ntohl (GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT.value__);
428 float cur_pref = 0.0;
431 remaining_quota_in = net->total_quota_in - (net->active_addresses * min_bw);
432 remaining_quota_out = net->total_quota_out - (net->active_addresses * min_bw);
434 LOG (GNUNET_ERROR_TYPE_ERROR, "Remaining bandwidth : (in/out): %llu/%llu \n",
435 remaining_quota_in, remaining_quota_out);
436 for (cur = net->head; NULL != cur; cur = cur->next)
438 t = GNUNET_CONTAINER_multihashmap_get (s->prefs, &cur->addr->peer.hashPubKey);
440 total_prefs += DEFAULT_PREFERENCE;
444 for (cur = net->head; NULL != cur; cur = cur->next)
446 t = GNUNET_CONTAINER_multihashmap_get (s->prefs, &cur->addr->peer.hashPubKey);
448 cur_pref = DEFAULT_PREFERENCE;
451 quota_in = min_bw + (cur_pref / total_prefs) * (float) remaining_quota_in;
452 quota_out = min_bw + (cur_pref / total_prefs) * (float) remaining_quota_out;
453 LOG (GNUNET_ERROR_TYPE_ERROR,
454 "New quota for peer `%s' with preference (cur/total) %.3f/%.3f (in/out): %llu /%llu\n",
455 GNUNET_i2s (&cur->addr->peer),
460 quota_in_used += quota_in;
461 quota_out_used += quota_out;
464 LOG (GNUNET_ERROR_TYPE_ERROR,
465 "Total quota would be: (in/out): %llu /%llu\n",
468 LOG (GNUNET_ERROR_TYPE_ERROR,
469 "New quota would be: (in/out): %llu /%llu\n",
473 LOG (GNUNET_ERROR_TYPE_DEBUG,
474 "New per address quota for network type `%s' for %u addresses (in/out): %llu/%llu \n",
475 net->desc, net->active_addresses, quota_in, quota_out);
480 /* Compare to current bandwidth assigned */
481 if ((quota_in != ntohl(cur->addr->assigned_bw_in.value__)) ||
482 (quota_out != ntohl(cur->addr->assigned_bw_out.value__)))
484 cur->addr->assigned_bw_in.value__ = htonl (quota_in);
485 cur->addr->assigned_bw_out.value__ = htonl (quota_out);
486 /* Notify on change */
487 if ((GNUNET_YES == cur->addr->active) && (cur->addr != address_except))
488 s->bw_changed (s->bw_changed_cls, cur->addr);
495 addresse_increment (struct GAS_SIMPLISTIC_Handle *s,
500 if (GNUNET_YES == total)
502 s->total_addresses ++;
503 net->total_addresses ++;
504 GNUNET_STATISTICS_update (s->stats, "# ATS addresses total", 1, GNUNET_NO);
505 GNUNET_STATISTICS_update (s->stats, net->stat_total, 1, GNUNET_NO);
507 if (GNUNET_YES == active)
509 net->active_addresses ++;
510 s->active_addresses ++;
511 GNUNET_STATISTICS_update (s->stats, "# ATS active addresses total", 1, GNUNET_NO);
512 GNUNET_STATISTICS_update (s->stats, net->stat_active, 1, GNUNET_NO);
518 addresse_decrement (struct GAS_SIMPLISTIC_Handle *s,
524 if (GNUNET_YES == total)
526 if (s->total_addresses < 1)
533 s->total_addresses --;
534 GNUNET_STATISTICS_update (s->stats, "# ATS addresses total", -1, GNUNET_NO);
536 if (net->total_addresses < 1)
543 net->total_addresses --;
544 GNUNET_STATISTICS_update (s->stats, net->stat_total, -1, GNUNET_NO);
548 if (GNUNET_YES == active)
550 if (net->active_addresses < 1)
557 net->active_addresses --;
558 GNUNET_STATISTICS_update (s->stats, net->stat_active, -1, GNUNET_NO);
560 if (s->active_addresses < 1)
567 s->active_addresses --;
568 GNUNET_STATISTICS_update (s->stats, "# ATS addresses total", -1, GNUNET_NO);
576 * Add a single address to the solve
578 * @param solver the solver Handle
579 * @param addresses the address hashmap containing all addresses
580 * @param address the address to add
583 GAS_simplistic_address_add (void *solver, struct GNUNET_CONTAINER_MultiHashMap * addresses, struct ATS_Address *address)
585 struct GAS_SIMPLISTIC_Handle *s = solver;
586 struct Network *net = NULL;
587 struct AddressWrapper *aw = NULL;
589 GNUNET_assert (NULL != s);
591 for (c = 0; c < s->networks; c++)
593 net = &s->network_entries[c];
594 if (address->atsp_network_type == net->type)
603 aw = GNUNET_malloc (sizeof (struct AddressWrapper));
605 GNUNET_CONTAINER_DLL_insert (net->head, net->tail, aw);
606 addresse_increment (s, net, GNUNET_YES, GNUNET_NO);
607 aw->addr->solver_information = net;
610 LOG (GNUNET_ERROR_TYPE_DEBUG, "After adding address now total %u and active %u addresses in network `%s'\n",
611 net->total_addresses,
612 net->active_addresses,
617 * Remove an address from the solver
619 * @param solver the solver handle
620 * @param addresses the address hashmap containing all addresses
621 * @param address the address to remove
622 * @param session_only delete only session not whole address
625 GAS_simplistic_address_delete (void *solver,
626 struct GNUNET_CONTAINER_MultiHashMap * addresses,
627 struct ATS_Address *address, int session_only)
629 struct GAS_SIMPLISTIC_Handle *s = solver;
631 struct AddressWrapper *aw;
633 /* Remove an adress completely, we have to:
634 * - Remove from specific network
635 * - Decrease number of total addresses
637 * - decrease number of active addreses
641 net = (struct Network *) address->solver_information;
643 if (GNUNET_NO == session_only)
645 LOG (GNUNET_ERROR_TYPE_DEBUG, "Deleting %s address %p for peer `%s' from network `%s' (total: %u/ active: %u)\n",
646 (GNUNET_NO == address->active) ? "inactive" : "active",
647 address, GNUNET_i2s (&address->peer),
648 net->desc, net->total_addresses, net->active_addresses);
651 addresse_decrement (s, net, GNUNET_YES, GNUNET_NO);
652 for (aw = net->head; NULL != aw; aw = aw->next)
654 if (aw->addr == address)
662 GNUNET_CONTAINER_DLL_remove (net->head, net->tail, aw);
667 /* Remove session only: remove if active and update */
668 LOG (GNUNET_ERROR_TYPE_DEBUG, "Deleting %s session %p for peer `%s' from network `%s' (total: %u/ active: %u)\n",
669 (GNUNET_NO == address->active) ? "inactive" : "active",
670 address, GNUNET_i2s (&address->peer),
671 net->desc, net->total_addresses, net->active_addresses);
674 if (GNUNET_YES == address->active)
676 /* Address was active, remove from network and update quotas*/
677 address->active = GNUNET_NO;
678 if (GNUNET_SYSERR == addresse_decrement (s, net, GNUNET_NO, GNUNET_YES))
680 update_quota_per_network (s, net, NULL);
682 LOG (GNUNET_ERROR_TYPE_DEBUG, "After deleting address now total %u and active %u addresses in network `%s'\n",
683 net->total_addresses,
684 net->active_addresses,
689 static struct Network *
690 find_network (struct GAS_SIMPLISTIC_Handle *s, uint32_t type)
693 for (c = 0 ; c < s->networks; c++)
695 if (s->network_entries[c].type == type)
696 return &s->network_entries[c];
702 * Updates a single address in the solve
704 * @param solver the solver Handle
705 * @param addresses the address hashmap containing all addresses
706 * @param address the update address
707 * @param session the new session (if changed otherwise current)
708 * @param in_use the new address in use state (if changed otherwise current)
709 * @param atsi the latest ATS information
710 * @param atsi_count the atsi count
713 GAS_simplistic_address_update (void *solver,
714 struct GNUNET_CONTAINER_MultiHashMap *addresses,
715 struct ATS_Address *address,
718 const struct GNUNET_ATS_Information *atsi,
721 struct ATS_Address *new;
722 struct GAS_SIMPLISTIC_Handle *s = (struct GAS_SIMPLISTIC_Handle *) solver;
726 int save_active = GNUNET_NO;
727 struct Network *new_net = NULL;
728 for (i = 0; i < atsi_count; i++)
730 type = ntohl (atsi[i].type);
731 value = ntohl (atsi[i].value);
734 case GNUNET_ATS_UTILIZATION_UP:
735 //if (address->atsp_utilization_out.value__ != atsi[i].value)
738 case GNUNET_ATS_UTILIZATION_DOWN:
739 //if (address->atsp_utilization_in.value__ != atsi[i].value)
742 case GNUNET_ATS_QUALITY_NET_DELAY:
743 //if (address->atsp_latency.rel_value != value)
746 case GNUNET_ATS_QUALITY_NET_DISTANCE:
747 //if (address->atsp_distance != value)
750 case GNUNET_ATS_COST_WAN:
751 //if (address->atsp_cost_wan != value)
754 case GNUNET_ATS_COST_LAN:
755 //if (address->atsp_cost_lan != value)
758 case GNUNET_ATS_COST_WLAN:
759 //if (address->atsp_cost_wlan != value)
762 case GNUNET_ATS_NETWORK_TYPE:
763 if (address->atsp_network_type != value)
766 LOG (GNUNET_ERROR_TYPE_DEBUG, "Network type changed, moving %s address from `%s' to `%s'\n",
767 (GNUNET_YES == address->active) ? "active" : "inactive",
768 GNUNET_ATS_print_network_type(address->atsp_network_type),
769 GNUNET_ATS_print_network_type(value));
771 save_active = address->active;
772 /* remove from old network */
773 GAS_simplistic_address_delete (solver, addresses, address, GNUNET_NO);
775 /* set new network type */
776 address->atsp_network_type = value;
777 new_net = find_network (solver, value);
778 address->solver_information = new_net;
779 if (address->solver_information == NULL)
782 address->atsp_network_type = GNUNET_ATS_NET_UNSPECIFIED;
786 /* Add to new network and update*/
787 GAS_simplistic_address_add (solver, addresses, address);
788 if (GNUNET_YES == save_active)
790 /* check if bandwidth available in new network */
791 if (GNUNET_YES == (bw_available_in_network (new_net)))
793 /* Suggest updated address */
794 address->active = GNUNET_YES;
795 addresse_increment (s, new_net, GNUNET_NO, GNUNET_YES);
796 update_quota_per_network (solver, new_net, NULL);
800 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not enough bandwidth in new network, suggesting alternative address ..\n");
802 /* Set old address to zero bw */
803 address->assigned_bw_in = GNUNET_BANDWIDTH_value_init (0);
804 address->assigned_bw_out = GNUNET_BANDWIDTH_value_init (0);
805 s->bw_changed (s->bw_changed_cls, address);
807 /* Find new address to suggest since no bandwidth in network*/
808 new = (struct ATS_Address *) GAS_simplistic_get_preferred_address (s, addresses, &address->peer);
811 /* Have an alternative address to suggest */
812 s->bw_changed (s->bw_changed_cls, new);
819 case GNUNET_ATS_ARRAY_TERMINATOR:
822 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
823 "Received unsupported ATS type %u\n", type);
830 if (address->session_id != session)
832 LOG (GNUNET_ERROR_TYPE_DEBUG,
833 "Session changed from %u to %u\n", address->session_id, session);
834 address->session_id = session;
836 if (address->used != in_use)
838 LOG (GNUNET_ERROR_TYPE_DEBUG,
839 "Usage changed from %u to %u\n", address->used, in_use);
840 address->used = in_use;
848 * Find a "good" address to use for a peer. If we already have an existing
849 * address, we stick to it. Otherwise, we pick by lowest distance and then
852 * @param cls the 'struct ATS_Address**' where we store the result
854 * @param value another 'struct ATS_Address*' to consider using
855 * @return GNUNET_OK (continue to iterate)
858 find_address_it (void *cls, const struct GNUNET_HashCode * key, void *value)
860 struct ATS_Address **previous_p = cls;
861 struct ATS_Address *current = (struct ATS_Address *) value;
862 struct ATS_Address *previous = *previous_p;
863 struct GNUNET_TIME_Absolute now;
864 struct Network *net = (struct Network *) current->solver_information;
866 now = GNUNET_TIME_absolute_get();
868 if (current->blocked_until.abs_value == GNUNET_TIME_absolute_max (now, current->blocked_until).abs_value)
870 /* This address is blocked for suggestion */
871 LOG (GNUNET_ERROR_TYPE_DEBUG,
872 "Address %p blocked for suggestion for %llu ms \n",
874 GNUNET_TIME_absolute_get_difference(now, current->blocked_until).rel_value);
878 if (GNUNET_NO == bw_available_in_network (net))
879 return GNUNET_OK; /* There's no bandwidth available in this network */
881 if (NULL != previous)
883 if ((0 == strcmp (previous->plugin, "tcp")) &&
884 (0 == strcmp (current->plugin, "tcp")))
886 if ((0 != previous->addr_len) &&
887 (0 == current->addr_len))
889 /* saved address was an outbound address, but we have an inbound address */
890 *previous_p = current;
893 if (0 == previous->addr_len)
895 /* saved address was an inbound address, so do not overwrite */
901 if (NULL == previous)
903 *previous_p = current;
906 if ((ntohl (previous->assigned_bw_in.value__) == 0) &&
907 (ntohl (current->assigned_bw_in.value__) > 0))
909 /* stick to existing connection */
910 *previous_p = current;
913 if (previous->atsp_distance > current->atsp_distance)
915 /* user shorter distance */
916 *previous_p = current;
919 if (previous->atsp_latency.rel_value > current->atsp_latency.rel_value)
921 /* user lower latency */
922 *previous_p = current;
930 find_active_address_it (void *cls, const struct GNUNET_HashCode * key, void *value)
932 struct ATS_Address * dest = (struct ATS_Address *) (*(struct ATS_Address **)cls);
933 struct ATS_Address * aa = (struct ATS_Address *) value;
935 if (GNUNET_YES == aa->active)
939 /* should never happen */
940 LOG (GNUNET_ERROR_TYPE_ERROR, "Multiple active addresses for peer `%s'\n", GNUNET_i2s (&aa->peer));
949 static struct ATS_Address *
950 find_active_address (void *solver,
951 struct GNUNET_CONTAINER_MultiHashMap * addresses,
952 const struct GNUNET_PeerIdentity *peer)
954 struct ATS_Address * dest = NULL;
956 GNUNET_CONTAINER_multihashmap_get_multiple(addresses,
958 &find_active_address_it, &dest);
963 * Get the prefered address for a specific peer
965 * @param solver the solver handle
966 * @param addresses the address hashmap containing all addresses
967 * @param peer the identity of the peer
969 const struct ATS_Address *
970 GAS_simplistic_get_preferred_address (void *solver,
971 struct GNUNET_CONTAINER_MultiHashMap * addresses,
972 const struct GNUNET_PeerIdentity *peer)
974 struct GAS_SIMPLISTIC_Handle *s = solver;
975 struct Network *net_prev;
976 struct Network *net_cur;
977 struct ATS_Address *cur;
978 struct ATS_Address *prev;
980 GNUNET_assert (s != NULL);
982 /* Get address with: stick to current address, lower distance, lower latency */
983 GNUNET_CONTAINER_multihashmap_get_multiple (addresses, &peer->hashPubKey,
984 &find_address_it, &cur);
987 LOG (GNUNET_ERROR_TYPE_DEBUG, "Cannot suggest address for peer `%s'\n", GNUNET_i2s (peer));
991 LOG (GNUNET_ERROR_TYPE_DEBUG, "Suggesting %s address %p for peer `%s'\n",
992 (GNUNET_NO == cur->active) ? "inactive" : "active",
993 cur, GNUNET_i2s (peer));
994 net_cur = (struct Network *) cur->solver_information;
995 if (GNUNET_YES == cur->active)
997 /* This address was selected previously, so no need to update quotas */
1001 /* This address was not active, so we have to:
1003 * - mark previous active address as not active
1004 * - update quota for previous address network
1005 * - update quota for this address network
1008 prev = find_active_address (s, addresses, peer);
1011 net_prev = (struct Network *) prev->solver_information;
1012 prev->active = GNUNET_NO; /* No active any longer */
1013 prev->assigned_bw_in = GNUNET_BANDWIDTH_value_init (0); /* no bw assigned */
1014 prev->assigned_bw_out = GNUNET_BANDWIDTH_value_init (0); /* no bw assigned */
1015 s->bw_changed (s->bw_changed_cls, prev); /* notify about bw change, REQUIRED? */
1016 if (GNUNET_SYSERR == addresse_decrement (s, net_prev, GNUNET_NO, GNUNET_YES))
1018 update_quota_per_network (s, net_prev, NULL);
1021 if (GNUNET_NO == (bw_available_in_network (cur->solver_information)))
1023 GNUNET_break (0); /* This should never happen*/
1027 cur->active = GNUNET_YES;
1028 addresse_increment(s, net_cur, GNUNET_NO, GNUNET_YES);
1029 update_quota_per_network (s, net_cur, cur);
1035 * Changes the preferences for a peer in the problem
1037 * @param solver the solver handle
1038 * @param client the client with this preference
1039 * @param peer the peer to change the preference for
1040 * @param kind the kind to change the preference
1041 * @param score the score
1044 GAS_simplistic_address_change_preference (void *solver,
1046 const struct GNUNET_PeerIdentity *peer,
1047 enum GNUNET_ATS_PreferenceKind kind,
1050 struct GAS_SIMPLISTIC_Handle *s = solver;
1051 struct PreferenceClient *cur;
1052 struct PreferencePeer *p;
1059 GNUNET_assert (NULL != solver);
1060 GNUNET_assert (NULL != client);
1061 GNUNET_assert (NULL != peer);
1063 LOG (GNUNET_ERROR_TYPE_DEBUG, "Client %p changes preference for peer `%s' %s %f\n",
1066 GNUNET_ATS_print_preference_type (kind),
1069 if (kind >= GNUNET_ATS_PreferenceCount)
1080 * Set of peers p_i in P
1081 * Set of preference kinds k
1082 * A preference value f_k_p_i with an unknown range
1085 * A client specific relative preference f_p_i_rel [1..2] for all peers
1087 * For every client c
1089 * For every preference kind k:
1091 * We remember for the preference f_p_i for each peer p_i.
1092 * We have a default preference value f_p_i = 0
1093 * We have a sum of all preferences f_t = sum (f_p_i)
1094 * So we can calculate a relative preference value fr_p_i:
1096 * f_k_p_i_rel = (f_t + f_p_i) / f_t
1097 * f_k_p_i_rel = [1..2], default 1.0
1099 * f_p_i_rel = sum (f_k_p_i_rel) / #k
1104 /* Find preference client */
1105 for (cur = s->pc_head; NULL != cur; cur = cur->next)
1107 if (client == cur->client)
1110 /* Not found: create new preference client */
1113 cur = GNUNET_malloc (sizeof (struct PreferenceClient));
1114 cur->client = client;
1115 GNUNET_CONTAINER_DLL_insert (s->pc_head, s->pc_tail, cur);
1118 /* Find entry for peer */
1119 for (p = cur->p_head; NULL != p; p = p->next)
1120 if (0 == memcmp (&p->id, peer, sizeof (p->id)))
1123 /* Not found: create new peer entry */
1126 p = GNUNET_malloc (sizeof (struct PreferencePeer));
1128 for (i = 0; i < GNUNET_ATS_PreferenceCount; i++)
1130 /* Default value per peer absolut preference for a quality:
1131 * No value set, so absolute preference 0 */
1133 /* Default value per peer relative preference for a quality: 1.0 */
1134 p->f_rel[i] = DEFAULT_PREFERENCE;
1136 GNUNET_CONTAINER_DLL_insert (cur->p_head, cur->p_tail, p);
1139 /* Update preference value according to type */
1141 case GNUNET_ATS_PREFERENCE_BANDWIDTH:
1142 case GNUNET_ATS_PREFERENCE_LATENCY:
1143 p->f[kind] = (p->f[kind] + score) / 2;
1145 case GNUNET_ATS_PREFERENCE_END:
1151 /* Recalcalculate total preference for this quality kind over all peers*/
1152 cur->f_total[kind] = 0;
1153 for (p = cur->p_head; NULL != p; p = p->next)
1154 cur->f_total[kind] += p->f[kind];
1156 LOG (GNUNET_ERROR_TYPE_DEBUG, "Client %p has total preference for %s of %.3f\n",
1158 GNUNET_ATS_print_preference_type (kind),
1159 cur->f_total[kind]);
1161 /* Recalcalculate relative preference for all peers */
1162 for (p = cur->p_head; NULL != p; p = p->next)
1164 /* Calculate relative preference for specific kind */
1165 p->f_rel[kind] = (cur->f_total[kind] + p->f[kind]) / cur->f_total[kind];
1166 LOG (GNUNET_ERROR_TYPE_DEBUG, "Client %p: peer `%s' has relative preference for %s of %.3f\n",
1168 GNUNET_i2s (&p->id),
1169 GNUNET_ATS_print_preference_type (kind),
1172 /* Calculate peer relative preference
1173 * Start with i = 1 to exclude terminator */
1175 for (i = 1; i < GNUNET_ATS_PreferenceCount; i ++)
1177 p->f_rel_total += p->f_rel[i];
1179 p->f_rel_total /= (GNUNET_ATS_PreferenceCount - 1.0); /* -1 due to terminator */
1180 LOG (GNUNET_ERROR_TYPE_DEBUG, "Client %p: peer `%s' has total relative preference of %.3f\n",
1182 GNUNET_i2s (&p->id),
1186 /* Calculcate global total relative peer preference over all clients */
1189 for (cur = s->pc_head; NULL != cur; cur = cur->next)
1191 for (p = cur->p_head; NULL != p; p = p->next)
1192 if (0 == memcmp (&p->id, peer, sizeof (p->id)))
1197 p_rel_global += p->f_rel_total;
1200 p_rel_global /= clients;
1201 LOG (GNUNET_ERROR_TYPE_DEBUG, "Global preference value for peer `%s': %.3f\n",
1202 GNUNET_i2s (peer), p_rel_global);
1204 /* Update global map */
1205 if (NULL != (dest = GNUNET_CONTAINER_multihashmap_get(s->prefs, &peer->hashPubKey)))
1206 (*dest) = p_rel_global;
1209 dest = GNUNET_malloc (sizeof (float));
1210 (*dest) = p_rel_global;
1211 GNUNET_CONTAINER_multihashmap_put(s->prefs,
1214 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1220 /* end of gnunet-service-ats_addresses_simplistic.c */