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22 * @file zonemaster/gnunet-service-zonemaster.c
23 * @brief publish records from namestore to GNUnet name system
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_dnsparser_lib.h"
29 #include "gnunet_dht_service.h"
30 #include "gnunet_namestore_service.h"
31 #include "gnunet_statistics_service.h"
34 #define LOG_STRERROR_FILE(kind,syscall,filename) GNUNET_log_from_strerror_file (kind, "util", syscall, filename)
38 * How often should we (re)publish each record before
41 #define PUBLISH_OPS_PER_EXPIRATION 4
44 * How often do we measure the delta between desired zone
45 * iteration speed and actual speed, and tell statistics
48 #define DELTA_INTERVAL 100
51 * How many records do we fetch in one shot from the namestore?
53 #define NS_BLOCK_SIZE 1000
56 * How many pending DHT operations do we allow at most?
58 #define DHT_QUEUE_LIMIT 2000
61 * How many events may the namestore give us before it has to wait
64 #define NAMESTORE_QUEUE_LIMIT 50
67 * The initial interval in milliseconds btween puts in
70 #define INITIAL_ZONE_ITERATION_INTERVAL GNUNET_TIME_UNIT_MILLISECONDS
73 * The upper bound for the zone iteration interval
76 #define MAXIMUM_ZONE_ITERATION_INTERVAL GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
79 * The default put interval for the zone iteration. In case
82 #define DEFAULT_ZONE_PUBLISH_TIME_WINDOW GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 4)
85 * The factor the current zone iteration interval is divided by for each
86 * additional new record
88 #define LATE_ITERATION_SPEEDUP_FACTOR 2
91 * What replication level do we use for DHT PUT operations?
93 #define DHT_GNS_REPLICATION_LEVEL 5
97 * Handle for DHT PUT activity triggered from the namestore monitor.
104 struct DhtPutActivity *next;
109 struct DhtPutActivity *prev;
112 * Handle for the DHT PUT operation.
114 struct GNUNET_DHT_PutHandle *ph;
117 * When was this PUT initiated?
119 struct GNUNET_TIME_Absolute start_date;
124 * Handle to the statistics service
126 static struct GNUNET_STATISTICS_Handle *statistics;
129 * Our handle to the DHT
131 static struct GNUNET_DHT_Handle *dht_handle;
134 * Our handle to the namestore service
136 static struct GNUNET_NAMESTORE_Handle *namestore_handle;
139 * Handle to iterate over our authoritative zone in namestore
141 static struct GNUNET_NAMESTORE_ZoneIterator *namestore_iter;
144 * Head of iteration put activities; kept in a DLL.
146 static struct DhtPutActivity *it_head;
149 * Tail of iteration put activities; kept in a DLL.
151 static struct DhtPutActivity *it_tail;
154 * Number of entries in the DHT queue #it_head.
156 static unsigned int dht_queue_length;
159 * Number of entries in the DHT queue #ma_head.
161 static unsigned int ma_queue_length;
164 * Useful for zone update for DHT put
166 static unsigned long long num_public_records;
169 * Last seen record count
171 static unsigned long long last_num_public_records;
174 * Number of successful put operations performed in the current
175 * measurement cycle (as measured in #check_zone_namestore_next()).
177 static unsigned long long put_cnt;
180 * What is the frequency at which we currently would like
181 * to perform DHT puts (per record)? Calculated in
182 * update_velocity() from the #zone_publish_time_window()
183 * and the total number of record sets we have (so far)
184 * observed in the zone.
186 static struct GNUNET_TIME_Relative target_iteration_velocity_per_record;
189 * Minimum relative expiration time of records seem during the current
192 static struct GNUNET_TIME_Relative min_relative_record_time;
195 * Minimum relative expiration time of records seem during the last
198 static struct GNUNET_TIME_Relative last_min_relative_record_time;
201 * Default time window for zone iteration
203 static struct GNUNET_TIME_Relative zone_publish_time_window_default;
206 * Time window for zone iteration, adjusted based on relative record
207 * expiration times in our zone.
209 static struct GNUNET_TIME_Relative zone_publish_time_window;
212 * When did we last start measuring the #DELTA_INTERVAL successful
213 * DHT puts? Used for velocity calculations.
215 static struct GNUNET_TIME_Absolute last_put_100;
218 * By how much should we try to increase our per-record iteration speed
219 * (over the desired speed calculated directly from the #put_interval)?
220 * Basically this value corresponds to the per-record CPU time overhead
223 static struct GNUNET_TIME_Relative sub_delta;
228 static struct GNUNET_SCHEDULER_Task *zone_publish_task;
231 * How many more values are left for the current query before we need
232 * to explicitly ask the namestore for more?
234 static unsigned int ns_iteration_left;
237 * #GNUNET_YES if zone has never been published before
239 static int first_zone_iteration;
242 * Optimize block insertion by caching map of private keys to
243 * public keys in memory?
245 static int cache_keys;
249 * Task run during shutdown.
255 shutdown_task (void *cls)
257 struct DhtPutActivity *ma;
260 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
262 while (NULL != (ma = it_head))
264 GNUNET_DHT_put_cancel (ma->ph);
266 GNUNET_CONTAINER_DLL_remove (it_head,
272 if (NULL != statistics)
274 GNUNET_STATISTICS_destroy (statistics,
278 if (NULL != zone_publish_task)
280 GNUNET_SCHEDULER_cancel (zone_publish_task);
281 zone_publish_task = NULL;
283 if (NULL != namestore_iter)
285 GNUNET_NAMESTORE_zone_iteration_stop (namestore_iter);
286 namestore_iter = NULL;
288 if (NULL != namestore_handle)
290 GNUNET_NAMESTORE_disconnect (namestore_handle);
291 namestore_handle = NULL;
293 if (NULL != dht_handle)
295 GNUNET_DHT_disconnect (dht_handle);
302 * Method called periodically that triggers iteration over authoritative records
307 publish_zone_namestore_next (void *cls)
310 zone_publish_task = NULL;
311 GNUNET_assert (NULL != namestore_iter);
312 GNUNET_assert (0 == ns_iteration_left);
313 ns_iteration_left = NS_BLOCK_SIZE;
314 GNUNET_NAMESTORE_zone_iterator_next (namestore_iter,
320 * Periodically iterate over our zone and store everything in dht
325 publish_zone_dht_start (void *cls);
329 * Calculate #target_iteration_velocity_per_record.
332 calculate_put_interval ()
334 if (0 == num_public_records)
337 * If no records are known (startup) or none present
338 * we can safely set the interval to the value for a single
341 target_iteration_velocity_per_record = zone_publish_time_window;
342 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
343 "No records in namestore database.\n");
347 last_min_relative_record_time
348 = GNUNET_TIME_relative_min (last_min_relative_record_time,
349 min_relative_record_time);
350 zone_publish_time_window
351 = GNUNET_TIME_relative_min (GNUNET_TIME_relative_divide (last_min_relative_record_time,
352 PUBLISH_OPS_PER_EXPIRATION),
353 zone_publish_time_window_default);
354 target_iteration_velocity_per_record
355 = GNUNET_TIME_relative_divide (zone_publish_time_window,
356 last_num_public_records);
358 target_iteration_velocity_per_record
359 = GNUNET_TIME_relative_min (target_iteration_velocity_per_record,
360 MAXIMUM_ZONE_ITERATION_INTERVAL);
361 GNUNET_STATISTICS_set (statistics,
362 "Minimum relative record expiration (in μs)",
363 last_min_relative_record_time.rel_value_us,
365 GNUNET_STATISTICS_set (statistics,
366 "Zone publication time window (in μs)",
367 zone_publish_time_window.rel_value_us,
369 GNUNET_STATISTICS_set (statistics,
370 "Target zone iteration velocity (μs)",
371 target_iteration_velocity_per_record.rel_value_us,
377 * Re-calculate our velocity and the desired velocity.
378 * We have succeeded in making #DELTA_INTERVAL puts, so
379 * now calculate the new desired delay between puts.
381 * @param cnt how many records were processed since the last call?
384 update_velocity (unsigned int cnt)
386 struct GNUNET_TIME_Relative delta;
387 unsigned long long pct = 0;
391 /* How fast were we really? */
392 delta = GNUNET_TIME_absolute_get_duration (last_put_100);
393 delta.rel_value_us /= cnt;
394 last_put_100 = GNUNET_TIME_absolute_get ();
396 /* calculate expected frequency */
397 if ( (num_public_records > last_num_public_records) &&
398 (GNUNET_NO == first_zone_iteration) )
400 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
401 "Last record count was lower than current record count. Reducing interval.\n");
402 last_num_public_records = num_public_records * LATE_ITERATION_SPEEDUP_FACTOR;
403 calculate_put_interval ();
405 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
406 "Desired global zone iteration interval is %s/record!\n",
407 GNUNET_STRINGS_relative_time_to_string (target_iteration_velocity_per_record,
410 /* Tell statistics actual vs. desired speed */
411 GNUNET_STATISTICS_set (statistics,
412 "Current zone iteration velocity (μs/record)",
415 /* update "sub_delta" based on difference, taking
416 previous sub_delta into account! */
417 if (target_iteration_velocity_per_record.rel_value_us > delta.rel_value_us)
419 /* We were too fast, reduce sub_delta! */
420 struct GNUNET_TIME_Relative corr;
422 corr = GNUNET_TIME_relative_subtract (target_iteration_velocity_per_record,
424 if (sub_delta.rel_value_us > delta.rel_value_us)
426 /* Reduce sub_delta by corr */
427 sub_delta = GNUNET_TIME_relative_subtract (sub_delta,
432 /* We're doing fine with waiting the full time, this
433 should theoretically only happen if we run at
435 sub_delta = GNUNET_TIME_UNIT_ZERO;
438 else if (target_iteration_velocity_per_record.rel_value_us < delta.rel_value_us)
440 /* We were too slow, increase sub_delta! */
441 struct GNUNET_TIME_Relative corr;
443 corr = GNUNET_TIME_relative_subtract (delta,
444 target_iteration_velocity_per_record);
445 sub_delta = GNUNET_TIME_relative_add (sub_delta,
447 if (sub_delta.rel_value_us > target_iteration_velocity_per_record.rel_value_us)
449 /* CPU overload detected, we cannot go at desired speed,
450 as this would mean using a negative delay. */
451 /* compute how much faster we would want to be for
452 the desired velocity */
453 if (0 == target_iteration_velocity_per_record.rel_value_us)
454 pct = UINT64_MAX; /* desired speed is infinity ... */
456 pct = (sub_delta.rel_value_us -
457 target_iteration_velocity_per_record.rel_value_us) * 100LLU
458 / target_iteration_velocity_per_record.rel_value_us;
459 sub_delta = target_iteration_velocity_per_record;
462 GNUNET_STATISTICS_set (statistics,
463 "# size of the DHT queue (it)",
466 GNUNET_STATISTICS_set (statistics,
467 "# size of the DHT queue (mon)",
470 GNUNET_STATISTICS_set (statistics,
471 "% speed increase needed for target velocity",
474 GNUNET_STATISTICS_set (statistics,
475 "# records processed in current iteration",
482 * Check if the current zone iteration needs to be continued
483 * by calling #publish_zone_namestore_next(), and if so with what delay.
486 check_zone_namestore_next ()
488 struct GNUNET_TIME_Relative delay;
490 if (0 != ns_iteration_left)
491 return; /* current NAMESTORE iteration not yet done */
492 update_velocity (put_cnt);
494 delay = GNUNET_TIME_relative_subtract (target_iteration_velocity_per_record,
496 /* We delay *once* per #NS_BLOCK_SIZE, so we need to multiply the
497 per-record delay calculated so far with the #NS_BLOCK_SIZE */
498 GNUNET_STATISTICS_set (statistics,
499 "Current artificial NAMESTORE delay (μs/record)",
502 delay = GNUNET_TIME_relative_multiply (delay,
504 GNUNET_assert (NULL == zone_publish_task);
505 zone_publish_task = GNUNET_SCHEDULER_add_delayed (delay,
506 &publish_zone_namestore_next,
512 * Continuation called from DHT once the PUT operation is done.
514 * @param cls a `struct DhtPutActivity`
517 dht_put_continuation (void *cls)
519 struct DhtPutActivity *ma = cls;
521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
524 GNUNET_CONTAINER_DLL_remove (it_head,
532 * Convert namestore records from the internal format to that
533 * suitable for publication (removes private records, converts
534 * to absolute expiration time).
536 * @param rd input records
537 * @param rd_count size of the @a rd and @a rd_public arrays
538 * @param rd_public where to write the converted records
539 * @return number of records written to @a rd_public
542 convert_records_for_export (const struct GNUNET_GNSRECORD_Data *rd,
543 unsigned int rd_count,
544 struct GNUNET_GNSRECORD_Data *rd_public)
546 struct GNUNET_TIME_Absolute now;
547 unsigned int rd_public_count;
550 now = GNUNET_TIME_absolute_get ();
551 for (unsigned int i=0;i<rd_count;i++)
552 if (0 == (rd[i].flags & GNUNET_GNSRECORD_RF_PRIVATE))
554 rd_public[rd_public_count] = rd[i];
555 if (0 != (rd[i].flags & GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION))
557 /* GNUNET_GNSRECORD_block_create will convert to absolute time;
558 we just need to adjust our iteration frequency */
559 min_relative_record_time.rel_value_us =
560 GNUNET_MIN (rd_public[rd_public_count].expiration_time,
561 min_relative_record_time.rel_value_us);
563 else if (rd_public[rd_public_count].expiration_time < now.abs_value_us)
565 /* record already expired, skip it */
570 return rd_public_count;
575 * Store GNS records in the DHT.
577 * @param key key of the zone
578 * @param label label to store under
579 * @param rd_public public record data
580 * @param rd_public_count number of records in @a rd_public
581 * @param ma handle for the put operation
582 * @return DHT PUT handle, NULL on error
584 static struct GNUNET_DHT_PutHandle *
585 perform_dht_put (const struct GNUNET_CRYPTO_EcdsaPrivateKey *key,
587 const struct GNUNET_GNSRECORD_Data *rd_public,
588 unsigned int rd_public_count,
589 struct DhtPutActivity *ma)
591 struct GNUNET_GNSRECORD_Block *block;
592 struct GNUNET_HashCode query;
593 struct GNUNET_TIME_Absolute expire;
595 struct GNUNET_DHT_PutHandle *ret;
597 expire = GNUNET_GNSRECORD_record_get_expiration_time (rd_public_count,
600 block = GNUNET_GNSRECORD_block_create2 (key,
606 block = GNUNET_GNSRECORD_block_create (key,
614 return NULL; /* whoops */
616 block_size = ntohl (block->purpose.size)
617 + sizeof (struct GNUNET_CRYPTO_EcdsaSignature)
618 + sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey);
619 GNUNET_GNSRECORD_query_from_private_key (key,
622 GNUNET_STATISTICS_update (statistics,
623 "DHT put operations initiated",
626 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
627 "Storing %u record(s) for label `%s' in DHT with expiration `%s' under key %s\n",
630 GNUNET_STRINGS_absolute_time_to_string (expire),
631 GNUNET_h2s (&query));
632 num_public_records++;
633 ret = GNUNET_DHT_put (dht_handle,
635 DHT_GNS_REPLICATION_LEVEL,
636 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
637 GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
641 &dht_put_continuation,
649 * We encountered an error in our zone iteration.
654 zone_iteration_error (void *cls)
657 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
658 "Got disconnected from namestore database, retrying.\n");
659 namestore_iter = NULL;
660 /* We end up here on error/disconnect/shutdown, so potentially
661 while a zone publish task or a DHT put is still running; hence
662 we need to cancel those. */
663 if (NULL != zone_publish_task)
665 GNUNET_SCHEDULER_cancel (zone_publish_task);
666 zone_publish_task = NULL;
668 zone_publish_task = GNUNET_SCHEDULER_add_now (&publish_zone_dht_start,
674 * Zone iteration is completed.
679 zone_iteration_finished (void *cls)
682 /* we're done with one iteration, calculate when to do the next one */
683 namestore_iter = NULL;
684 last_num_public_records = num_public_records;
685 first_zone_iteration = GNUNET_NO;
686 last_min_relative_record_time = min_relative_record_time;
687 calculate_put_interval ();
688 /* reset for next iteration */
689 min_relative_record_time
690 = GNUNET_TIME_relative_multiply (GNUNET_DHT_DEFAULT_REPUBLISH_FREQUENCY,
691 PUBLISH_OPS_PER_EXPIRATION);
692 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
693 "Zone iteration finished. Adjusted zone iteration interval to %s\n",
694 GNUNET_STRINGS_relative_time_to_string (target_iteration_velocity_per_record,
696 GNUNET_STATISTICS_set (statistics,
697 "Target zone iteration velocity (μs)",
698 target_iteration_velocity_per_record.rel_value_us,
700 GNUNET_STATISTICS_set (statistics,
701 "Number of public records in DHT",
702 last_num_public_records,
704 GNUNET_assert (NULL == zone_publish_task);
705 if (0 == last_num_public_records)
707 zone_publish_task = GNUNET_SCHEDULER_add_delayed (target_iteration_velocity_per_record,
708 &publish_zone_dht_start,
713 zone_publish_task = GNUNET_SCHEDULER_add_now (&publish_zone_dht_start,
720 * Function used to put all records successively into the DHT.
722 * @param cls the closure (NULL)
723 * @param key the private key of the authority (ours)
724 * @param label the name of the records, NULL once the iteration is done
725 * @param rd_count the number of records in @a rd
726 * @param rd the record data
729 put_gns_record (void *cls,
730 const struct GNUNET_CRYPTO_EcdsaPrivateKey *key,
732 unsigned int rd_count,
733 const struct GNUNET_GNSRECORD_Data *rd)
735 struct GNUNET_GNSRECORD_Data rd_public[rd_count];
736 unsigned int rd_public_count;
737 struct DhtPutActivity *ma;
741 rd_public_count = convert_records_for_export (rd,
744 if (0 == rd_public_count)
746 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
747 "Record set empty, moving to next record set\n");
748 check_zone_namestore_next ();
751 /* We got a set of records to publish */
752 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
753 "Starting DHT PUT\n");
754 ma = GNUNET_new (struct DhtPutActivity);
755 ma->start_date = GNUNET_TIME_absolute_get ();
756 ma->ph = perform_dht_put (key,
762 if (0 == put_cnt % DELTA_INTERVAL)
763 update_velocity (DELTA_INTERVAL);
764 check_zone_namestore_next ();
767 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
768 "Could not perform DHT PUT, is the DHT running?\n");
773 GNUNET_CONTAINER_DLL_insert_tail (it_head,
776 if (dht_queue_length > DHT_QUEUE_LIMIT)
779 GNUNET_CONTAINER_DLL_remove (it_head,
782 GNUNET_DHT_put_cancel (ma->ph);
784 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
785 "DHT PUT unconfirmed after %s, aborting PUT\n",
786 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_duration (ma->start_date),
794 * Periodically iterate over all zones and store everything in DHT
799 publish_zone_dht_start (void *cls)
802 zone_publish_task = NULL;
803 GNUNET_STATISTICS_update (statistics,
804 "Full zone iterations launched",
807 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
808 "Starting DHT zone update!\n");
809 /* start counting again */
810 num_public_records = 0;
811 GNUNET_assert (NULL == namestore_iter);
812 ns_iteration_left = 1;
814 = GNUNET_NAMESTORE_zone_iteration_start (namestore_handle,
815 NULL, /* All zones */
816 &zone_iteration_error,
820 &zone_iteration_finished,
822 GNUNET_assert (NULL != namestore_iter);
827 * Performe zonemaster duties: watch namestore, publish records.
830 * @param server the initialized server
831 * @param c configuration to use
835 const struct GNUNET_CONFIGURATION_Handle *c,
836 struct GNUNET_SERVICE_Handle *service)
838 unsigned long long max_parallel_bg_queries = 128;
842 last_put_100 = GNUNET_TIME_absolute_get (); /* first time! */
843 min_relative_record_time
844 = GNUNET_TIME_relative_multiply (GNUNET_DHT_DEFAULT_REPUBLISH_FREQUENCY,
845 PUBLISH_OPS_PER_EXPIRATION);
846 target_iteration_velocity_per_record = INITIAL_ZONE_ITERATION_INTERVAL;
847 namestore_handle = GNUNET_NAMESTORE_connect (c);
848 if (NULL == namestore_handle)
850 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
851 _("Failed to connect to the namestore!\n"));
852 GNUNET_SCHEDULER_shutdown ();
855 cache_keys = GNUNET_CONFIGURATION_get_value_yesno (c,
858 zone_publish_time_window_default = DEFAULT_ZONE_PUBLISH_TIME_WINDOW;
860 GNUNET_CONFIGURATION_get_value_time (c,
862 "ZONE_PUBLISH_TIME_WINDOW",
863 &zone_publish_time_window_default))
865 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
866 "Time window for zone iteration: %s\n",
867 GNUNET_STRINGS_relative_time_to_string (zone_publish_time_window,
870 zone_publish_time_window = zone_publish_time_window_default;
872 GNUNET_CONFIGURATION_get_value_number (c,
874 "MAX_PARALLEL_BACKGROUND_QUERIES",
875 &max_parallel_bg_queries))
877 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
878 "Number of allowed parallel background queries: %llu\n",
879 max_parallel_bg_queries);
881 if (0 == max_parallel_bg_queries)
882 max_parallel_bg_queries = 1;
883 dht_handle = GNUNET_DHT_connect (c,
884 (unsigned int) max_parallel_bg_queries);
885 if (NULL == dht_handle)
887 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
888 _("Could not connect to DHT!\n"));
889 GNUNET_SCHEDULER_add_now (&shutdown_task,
894 /* Schedule periodic put for our records. */
895 first_zone_iteration = GNUNET_YES;
896 statistics = GNUNET_STATISTICS_create ("zonemaster",
898 GNUNET_STATISTICS_set (statistics,
899 "Target zone iteration velocity (μs)",
900 target_iteration_velocity_per_record.rel_value_us,
902 zone_publish_task = GNUNET_SCHEDULER_add_now (&publish_zone_dht_start,
904 GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
910 * Define "main" method using service macro.
914 GNUNET_SERVICE_OPTION_NONE,
919 GNUNET_MQ_handler_end());
922 /* end of gnunet-service-zonemaster.c */