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3 (C) 2010,2011 Christian Grothoff (and other contributing authors)
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22 * @brief automatic transport selection API
23 * @author Christian Grothoff
24 * @author Matthias Wachs
28 * - extend API to get performance data
29 * - implement simplistic strategy based on say 'lowest latency' or strict ordering
30 * - extend API to get peer preferences, implement proportional bandwidth assignment
31 * - re-implement API against a real ATS service (!)
34 #include "gnunet_ats_service.h"
36 #define DEBUG_ATS GNUNET_EXTRA_LOGGING
38 // NOTE: this implementation is simply supposed
39 // to implement a simplistic strategy in-process;
40 // in the future, we plan to replace it with a real
41 // service implementation
44 * Allocation record for a peer's address.
46 struct AllocationRecord
50 * Performance information associated with this address (array).
52 struct GNUNET_TRANSPORT_ATS_Information *ats;
60 * Address this record represents, allocated at the end of this struct.
62 const void *plugin_addr;
65 * Session associated with this record.
67 struct Session *session;
70 * Number of bytes in plugin_addr.
72 size_t plugin_addr_len;
75 * Number of entries in 'ats'.
80 * Bandwidth assigned to this address right now, 0 for none.
82 struct GNUNET_BANDWIDTH_Value32NBO bandwidth;
85 * Set to GNUNET_YES if this is the connected address of a connected peer.
93 * Opaque handle to obtain address suggestions.
95 struct GNUNET_ATS_SuggestionContext
99 * Function to call with our final suggestion.
101 GNUNET_ATS_AddressSuggestionCallback cb;
111 struct GNUNET_ATS_Handle *atc;
114 * Which peer are we monitoring?
116 struct GNUNET_PeerIdentity target;
122 * Handle to the ATS subsystem.
124 struct GNUNET_ATS_Handle
129 const struct GNUNET_CONFIGURATION_Handle *cfg;
132 * Function to call when the allocation changes.
134 GNUNET_TRANSPORT_ATS_AllocationNotification alloc_cb;
137 * Closure for 'alloc_cb'.
142 * Information about all connected peers. Maps peer identities
143 * to one or more 'struct AllocationRecord' values.
145 struct GNUNET_CONTAINER_MultiHashMap *peers;
148 * Map of PeerIdentities to 'struct GNUNET_ATS_SuggestionContext's.
150 struct GNUNET_CONTAINER_MultiHashMap *notify_map;
154 * Task scheduled to update our bandwidth assignment.
156 GNUNET_SCHEDULER_TaskIdentifier ba_task;
159 * Total bandwidth per configuration.
161 unsigned long long total_bps;
166 * Count number of connected records.
168 * @param cls pointer to counter
169 * @param key identity of the peer associated with the records
170 * @param value a 'struct AllocationRecord'
171 * @return GNUNET_YES (continue iteration)
174 count_connections (void *cls, const GNUNET_HashCode * key, void *value)
176 unsigned int *ac = cls;
177 struct AllocationRecord *ar = value;
179 if (GNUNET_YES == ar->connected)
186 * Closure for 'set_bw_connections'.
188 struct SetBandwidthContext
193 struct GNUNET_ATS_Handle *atc;
196 * Bandwidth to assign.
198 struct GNUNET_BANDWIDTH_Value32NBO bw;
203 * Set bandwidth based on record.
205 * @param cls 'struct SetBandwidthContext'
206 * @param key identity of the peer associated with the records
207 * @param value a 'struct AllocationRecord'
208 * @return GNUNET_YES (continue iteration)
211 set_bw_connections (void *cls, const GNUNET_HashCode * key, void *value)
213 struct SetBandwidthContext *sbc = cls;
214 struct AllocationRecord *ar = value;
216 if (GNUNET_YES == ar->connected)
218 ar->bandwidth = sbc->bw;
219 sbc->atc->alloc_cb (sbc->atc->alloc_cb_cls,
220 (const struct GNUNET_PeerIdentity *) key,
221 ar->plugin_name, ar->session, ar->plugin_addr,
222 ar->plugin_addr_len, ar->bandwidth);
224 else if (ntohl (ar->bandwidth.value__) > 0)
226 ar->bandwidth = GNUNET_BANDWIDTH_value_init (0);
227 sbc->atc->alloc_cb (sbc->atc->alloc_cb_cls,
228 (const struct GNUNET_PeerIdentity *) key,
229 ar->plugin_name, ar->session, ar->plugin_addr,
230 ar->plugin_addr_len, ar->bandwidth);
237 * Task run to update bandwidth assignments.
239 * @param cls the 'struct GNUNET_ATS_Handle'
240 * @param tc scheduler context
243 update_bandwidth_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
245 struct GNUNET_ATS_Handle *atc = cls;
247 struct SetBandwidthContext bwc;
249 atc->ba_task = GNUNET_SCHEDULER_NO_TASK;
250 /* FIXME: update calculations NICELY; what follows is a naive version */
251 GNUNET_CONTAINER_multihashmap_iterate (atc->peers, &count_connections, &ac);
255 GNUNET_assert (ac > 0);
256 bwc.bw = GNUNET_BANDWIDTH_value_init (atc->total_bps / ac);
257 GNUNET_CONTAINER_multihashmap_iterate (atc->peers, &set_bw_connections, &bwc);
262 * Calculate an updated bandwidth assignment and notify.
265 * @param change which allocation record changed?
268 update_bandwidth_assignment (struct GNUNET_ATS_Handle *atc,
269 struct AllocationRecord *change)
271 /* FIXME: based on the 'change', update the LP-problem... */
272 if (atc->ba_task == GNUNET_SCHEDULER_NO_TASK)
273 atc->ba_task = GNUNET_SCHEDULER_add_now (&update_bandwidth_task, atc);
278 * Function called with feasbile addresses we might want to suggest.
280 * @param cls the 'struct GNUNET_ATS_SuggestionContext'
281 * @param key identity of the peer
282 * @param value a 'struct AllocationRecord' for the peer
283 * @return GNUNET_NO if we're done, GNUNET_YES if we did not suggest an address yet
286 suggest_address (void *cls, const GNUNET_HashCode * key, void *value)
288 struct GNUNET_ATS_SuggestionContext *asc = cls;
289 struct AllocationRecord *ar = value;
292 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "ats-api",
293 "Suggesting address for peer `%s'\n", GNUNET_h2s (key));
296 /* trivial strategy: pick first available address... */
297 asc->cb (asc->cb_cls, &asc->target, ar->plugin_name, ar->plugin_addr,
298 ar->plugin_addr_len, ar->session,
299 GNUNET_BANDWIDTH_value_init (asc->atc->total_bps / 32), ar->ats,
306 map_it (void *cls, const GNUNET_HashCode * key, void *value)
308 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "ats-api", "Found entry for %s\n",
314 * We would like to establish a new connection with a peer.
315 * ATS should suggest a good address to begin with.
318 * @param peer identity of the new peer
319 * @param cb function to call with the address
320 * @param cb_cls closure for cb
322 struct GNUNET_ATS_SuggestionContext *
323 GNUNET_ATS_suggest_address (struct GNUNET_ATS_Handle *atc,
324 const struct GNUNET_PeerIdentity *peer,
325 GNUNET_ATS_AddressSuggestionCallback cb,
328 struct GNUNET_ATS_SuggestionContext *asc;
331 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "ats-api",
332 "Looking up suggested address for peer `%s'\n",
335 asc = GNUNET_malloc (sizeof (struct GNUNET_ATS_SuggestionContext));
337 asc->cb_cls = cb_cls;
340 (void) GNUNET_CONTAINER_multihashmap_get_multiple (atc->peers, &peer->hashPubKey,
341 &suggest_address, asc);
348 GNUNET_CONTAINER_multihashmap_put (atc->notify_map, &peer->hashPubKey, asc,
349 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
355 * Cancel suggestion request.
357 * @param asc handle of the request to cancel
360 GNUNET_ATS_suggest_address_cancel (struct GNUNET_ATS_SuggestionContext *asc)
362 GNUNET_assert (GNUNET_OK ==
363 GNUNET_CONTAINER_multihashmap_remove (asc->atc->notify_map,
364 &asc->target.hashPubKey,
371 * Initialize the ATS subsystem.
373 * @param cfg configuration to use
374 * @param alloc_cb notification to call whenever the allocation changed
375 * @param alloc_cb_cls closure for 'alloc_cb'
376 * @return ats context
378 struct GNUNET_ATS_Handle *
379 GNUNET_ATS_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
380 GNUNET_TRANSPORT_ATS_AllocationNotification alloc_cb,
383 struct GNUNET_ATS_Handle *atc;
386 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "ats-api", "ATS init\n");
388 atc = GNUNET_malloc (sizeof (struct GNUNET_ATS_Handle));
390 atc->alloc_cb = alloc_cb;
391 atc->alloc_cb_cls = alloc_cb_cls;
392 atc->peers = GNUNET_CONTAINER_multihashmap_create (256);
393 atc->notify_map = GNUNET_CONTAINER_multihashmap_create (256);
394 GNUNET_CONFIGURATION_get_value_number (cfg, "core", "TOTAL_QUOTA_OUT",
401 * Free an allocation record.
404 * @param key identity of the peer associated with the record
405 * @param value the 'struct AllocationRecord' to free
406 * @return GNUNET_OK (continue to iterate)
409 destroy_allocation_record (void *cls, const GNUNET_HashCode * key, void *value)
411 struct AllocationRecord *ar = value;
413 GNUNET_array_grow (ar->ats, ar->ats_count, 0);
414 GNUNET_free (ar->plugin_name);
421 * Shutdown the ATS subsystem.
426 GNUNET_ATS_shutdown (struct GNUNET_ATS_Handle *atc)
429 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "ats-api", "ATS shutdown\n");
431 if (GNUNET_SCHEDULER_NO_TASK != atc->ba_task)
433 GNUNET_SCHEDULER_cancel (atc->ba_task);
434 atc->ba_task = GNUNET_SCHEDULER_NO_TASK;
436 GNUNET_CONTAINER_multihashmap_iterate (atc->peers, &destroy_allocation_record,
438 GNUNET_CONTAINER_multihashmap_destroy (atc->peers);
439 GNUNET_assert (GNUNET_CONTAINER_multihashmap_size (atc->notify_map) == 0);
440 GNUNET_CONTAINER_multihashmap_destroy (atc->notify_map);
441 atc->notify_map = NULL;
447 * Closure for 'update_session'
449 struct UpdateSessionContext
454 struct GNUNET_ATS_Handle *atc;
457 * Allocation record with new information.
459 struct AllocationRecord *arnew;
464 * Update an allocation record, merging with the new information
466 * @param cls a new 'struct AllocationRecord'
467 * @param key identity of the peer associated with the records
468 * @param value the old 'struct AllocationRecord'
469 * @return GNUNET_YES if the records do not match,
470 * GNUNET_NO if the record do match and 'old' was updated
473 update_session (void *cls, const GNUNET_HashCode * key, void *value)
475 struct UpdateSessionContext *usc = cls;
476 struct AllocationRecord *arnew = usc->arnew;
477 struct AllocationRecord *arold = value;
485 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "ats-api",
486 "Updating session for peer `%s' plugin `%s'\n",
487 GNUNET_h2s (key), arold->plugin_name);
490 if (0 != strcmp (arnew->plugin_name, arold->plugin_name))
492 if (((arnew->session == arold->session) && (arnew->session != NULL)) ||
493 ((arold->session == NULL) &&
494 (arold->plugin_addr_len == arnew->plugin_addr_len) &&
496 memcmp (arold->plugin_addr, arnew->plugin_addr,
497 arnew->plugin_addr_len))))
501 if (arnew->session != arold->session)
503 arold->session = arnew->session;
506 if ((arnew->connected == GNUNET_YES) && (arold->connected == GNUNET_NO))
508 arold->connected = GNUNET_YES;
512 /* Update existing value */
514 while (c_new < arnew->ats_count)
518 while (c_old < arold->ats_count)
520 if (arold->ats[c_old].type == arnew->ats[c_new].type)
523 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
524 "Found type %i, old value=%i new value=%i\n",
525 ntohl (arold->ats[c_old].type),
526 ntohl (arold->ats[c_old].value),
527 ntohl (arnew->ats[c_new].value));
529 arold->ats[c_old].value = arnew->ats[c_new].value;
535 if (found == GNUNET_NO)
538 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Added new type %i new value=%i\n",
539 ntohl (arnew->ats[c_new].type),
540 ntohl (arnew->ats[c_new].value));
541 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Old array size: %u\n",
544 GNUNET_array_grow (arold->ats, arold->ats_count, arold->ats_count + 1);
545 GNUNET_assert (arold->ats_count >= 2);
546 arold->ats[arold->ats_count - 2].type = arnew->ats[c_new].type;
547 arold->ats[arold->ats_count - 2].value = arnew->ats[c_new].value;
548 arold->ats[arold->ats_count - 1].type = htonl (0);
549 arold->ats[arold->ats_count - 1].value = htonl (0);
551 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "New array size: %i\n",
558 if (GNUNET_YES == change)
559 update_bandwidth_assignment (usc->atc, arold);
567 * Create an allocation record with the given properties.
569 * @param plugin_name name of the currently used transport plugin
570 * @param session session in use (if available)
571 * @param plugin_addr address in use (if available)
572 * @param plugin_addr_len number of bytes in plugin_addr
573 * @param ats performance data for the connection
574 * @param ats_count number of performance records in 'ats'
576 static struct AllocationRecord *
577 create_allocation_record (const char *plugin_name, struct Session *session,
578 const void *plugin_addr, size_t plugin_addr_len,
579 const struct GNUNET_TRANSPORT_ATS_Information *ats,
582 struct AllocationRecord *ar;
584 ar = GNUNET_malloc (sizeof (struct AllocationRecord) + plugin_addr_len);
585 ar->plugin_name = GNUNET_strdup (plugin_name);
586 ar->plugin_addr = &ar[1];
587 memcpy (&ar[1], plugin_addr, plugin_addr_len);
588 ar->session = session;
589 ar->plugin_addr_len = plugin_addr_len;
590 GNUNET_assert (ats_count > 0);
591 GNUNET_array_grow (ar->ats, ar->ats_count, ats_count);
592 memcpy (ar->ats, ats,
593 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
599 * Mark all matching allocation records as not connected.
601 * @param cls 'struct GTS_AtsHandle'
602 * @param key identity of the peer associated with the record
603 * @param value the 'struct AllocationRecord' to clear the 'connected' flag
604 * @return GNUNET_OK (continue to iterate)
607 disconnect_peer (void *cls, const GNUNET_HashCode * key, void *value)
609 struct GNUNET_ATS_Handle *atc = cls;
610 struct AllocationRecord *ar = value;
612 if (GNUNET_YES == ar->connected)
614 ar->connected = GNUNET_NO;
615 update_bandwidth_assignment (atc, ar);
622 * We established a new connection with a peer (for example, because
623 * core asked for it or because the other peer connected to us).
624 * Calculate bandwidth assignments including the new peer.
627 * @param peer identity of the new peer
628 * @param plugin_name name of the currently used transport plugin
629 * @param session session in use (if available)
630 * @param plugin_addr address in use (if available)
631 * @param plugin_addr_len number of bytes in plugin_addr
632 * @param ats performance data for the connection
633 * @param ats_count number of performance records in 'ats'
636 GNUNET_ATS_peer_connect (struct GNUNET_ATS_Handle *atc,
637 const struct GNUNET_PeerIdentity *peer,
638 const char *plugin_name, struct Session *session,
639 const void *plugin_addr, size_t plugin_addr_len,
640 const struct GNUNET_TRANSPORT_ATS_Information *ats,
643 struct AllocationRecord *ar;
644 struct UpdateSessionContext usc;
646 (void) GNUNET_CONTAINER_multihashmap_iterate (atc->peers, &disconnect_peer,
648 ar = create_allocation_record (plugin_name, session, plugin_addr,
649 plugin_addr_len, ats, ats_count);
650 ar->connected = GNUNET_YES;
654 GNUNET_CONTAINER_multihashmap_iterate (atc->peers, &update_session, &usc))
656 destroy_allocation_record (NULL, &peer->hashPubKey, ar);
659 GNUNET_assert (GNUNET_OK ==
660 GNUNET_CONTAINER_multihashmap_put (atc->peers,
661 &peer->hashPubKey, ar,
662 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
667 * We disconnected from the given peer (for example, because ats, core
668 * or blacklist asked for it or because the other peer disconnected).
669 * Calculate bandwidth assignments without the peer.
672 * @param peer identity of the new peer
675 GNUNET_ATS_peer_disconnect (struct GNUNET_ATS_Handle *atc,
676 const struct GNUNET_PeerIdentity *peer)
678 (void) GNUNET_CONTAINER_multihashmap_get_multiple (atc->peers,
680 &disconnect_peer, atc);
685 * Closure for 'destroy_allocation_record'
687 struct SessionDestroyContext
692 struct GNUNET_ATS_Handle *atc;
695 * Session being destroyed.
697 const struct Session *session;
702 * Free an allocation record matching the given session.
704 * @param cls the 'struct SessionDestroyContext'
705 * @param key identity of the peer associated with the record
706 * @param value the 'struct AllocationRecord' to free
707 * @return GNUNET_OK (continue to iterate)
710 destroy_session (void *cls, const GNUNET_HashCode * key, void *value)
712 struct SessionDestroyContext *sdc = cls;
713 struct AllocationRecord *ar = value;
715 if (ar->session != sdc->session)
718 if (ar->plugin_addr != NULL)
720 GNUNET_assert (GNUNET_OK ==
721 GNUNET_CONTAINER_multihashmap_remove (sdc->atc->peers, key,
723 if (GNUNET_YES == ar->connected) ;
725 /* FIXME: is this supposed to be allowed? What to do then? */
728 destroy_allocation_record (NULL, key, ar);
734 * A session got destroyed, stop including it as a valid address.
737 * @param peer identity of the peer
738 * @param session session handle that is no longer valid
741 GNUNET_ATS_session_destroyed (struct GNUNET_ATS_Handle *atc,
742 const struct GNUNET_PeerIdentity *peer,
743 const struct Session *session)
745 struct SessionDestroyContext sdc;
748 sdc.session = session;
749 (void) GNUNET_CONTAINER_multihashmap_iterate (atc->peers, &destroy_session,
755 * Notify validation watcher that an entry is now valid
757 * @param cls 'struct ValidationEntry' that is now valid
758 * @param key peer identity (unused)
759 * @param value a 'GST_ValidationIteratorContext' to notify
760 * @return GNUNET_YES (continue to iterate)
763 notify_valid (void *cls, const GNUNET_HashCode * key, void *value)
765 struct AllocationRecord *ar = cls;
766 struct GNUNET_ATS_SuggestionContext *asc = value;
768 asc->cb (asc->cb_cls, &asc->target, ar->plugin_name, ar->plugin_addr,
769 ar->plugin_addr_len, ar->session,
770 GNUNET_BANDWIDTH_value_init (asc->atc->total_bps / 32), ar->ats,
772 GNUNET_ATS_suggest_address_cancel (asc);
779 * We have updated performance statistics for a given address. Note
780 * that this function can be called for addresses that are currently
781 * in use as well as addresses that are valid but not actively in use.
782 * Furthermore, the peer may not even be connected to us right now (in
783 * which case the call may be ignored or the information may be stored
784 * for later use). Update bandwidth assignments.
787 * @param peer identity of the peer
788 * @param valid_until how long is the address valid?
789 * @param plugin_name name of the transport plugin
790 * @param session session handle (if available)
791 * @param plugin_addr address (if available)
792 * @param plugin_addr_len number of bytes in plugin_addr
793 * @param ats performance data for the address
794 * @param ats_count number of performance records in 'ats'
797 GNUNET_ATS_address_update (struct GNUNET_ATS_Handle *atc,
798 const struct GNUNET_PeerIdentity *peer,
799 struct GNUNET_TIME_Absolute valid_until,
800 const char *plugin_name, struct Session *session,
801 const void *plugin_addr, size_t plugin_addr_len,
802 const struct GNUNET_TRANSPORT_ATS_Information *ats,
805 struct AllocationRecord *ar;
806 struct UpdateSessionContext usc;
809 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "ats-api",
810 "Updating address for peer `%s', plugin `%s'\n",
811 GNUNET_i2s (peer), plugin_name);
813 ar = create_allocation_record (plugin_name, session, plugin_addr,
814 plugin_addr_len, ats, ats_count);
818 GNUNET_CONTAINER_multihashmap_iterate (atc->peers, &update_session, &usc))
820 destroy_allocation_record (NULL, &peer->hashPubKey, ar);
824 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "ats-api",
825 "Adding new address for peer `%s', plugin `%s'\n",
826 GNUNET_i2s (peer), plugin_name);
828 GNUNET_assert (GNUNET_OK ==
829 GNUNET_CONTAINER_multihashmap_put (atc->peers,
830 &peer->hashPubKey, ar,
831 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
832 GNUNET_CONTAINER_multihashmap_get_multiple (atc->notify_map,
833 &peer->hashPubKey, ¬ify_valid,
837 /* end of file gnunet-service-transport_ats.c */