2 This file is part of GNUnet.
3 (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 * @file statistics/statistics_api.c
23 * @brief API of the statistics service
24 * @author Christian Grothoff
27 #include "gnunet_client_lib.h"
28 #include "gnunet_constants.h"
29 #include "gnunet_container_lib.h"
30 #include "gnunet_protocols.h"
31 #include "gnunet_server_lib.h"
32 #include "gnunet_statistics_service.h"
33 #include "gnunet_strings_lib.h"
34 #include "statistics.h"
37 * How long do we wait until a statistics request for setting
38 * a value times out? (The update will be lost if the
39 * service does not react within this timeframe).
41 #define SET_TRANSMIT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 2)
43 #define LOG(kind,...) GNUNET_log_from (kind, "statistics-api",__VA_ARGS__)
73 * Entry kept for each value we are watching.
75 struct GNUNET_STATISTICS_WatchEntry
79 * What subsystem is this action about? (never NULL)
84 * What value is this action about? (never NULL)
91 GNUNET_STATISTICS_Iterator proc;
102 * Linked list of things we still need to do.
104 struct GNUNET_STATISTICS_GetHandle
108 * This is a doubly linked list.
110 struct GNUNET_STATISTICS_GetHandle *next;
113 * This is a doubly linked list.
115 struct GNUNET_STATISTICS_GetHandle *prev;
118 * Main statistics handle.
120 struct GNUNET_STATISTICS_Handle *sh;
123 * What subsystem is this action about? (can be NULL)
128 * What value is this action about? (can be NULL)
133 * Continuation to call once action is complete.
135 GNUNET_STATISTICS_Callback cont;
138 * Function to call (for GET actions only).
140 GNUNET_STATISTICS_Iterator proc;
143 * Closure for proc and cont.
148 * Timeout for this action.
150 struct GNUNET_TIME_Absolute timeout;
158 * Flag for SET/UPDATE actions.
163 * Has the current iteration been aborted; for GET actions.
168 * Is this a GET, SET, UPDATE or WATCH?
170 enum ActionType type;
173 * Size of the message that we will be transmitting.
181 * Handle for the service.
183 struct GNUNET_STATISTICS_Handle
186 * Name of our subsystem.
191 * Configuration to use.
193 const struct GNUNET_CONFIGURATION_Handle *cfg;
196 * Socket (if available).
198 struct GNUNET_CLIENT_Connection *client;
201 * Currently pending transmission request.
203 struct GNUNET_CLIENT_TransmitHandle *th;
206 * Head of the linked list of pending actions (first action
209 struct GNUNET_STATISTICS_GetHandle *action_head;
212 * Tail of the linked list of actions (for fast append).
214 struct GNUNET_STATISTICS_GetHandle *action_tail;
217 * Action we are currently busy with (action request has been
218 * transmitted, we're now receiving the response from the
221 struct GNUNET_STATISTICS_GetHandle *current;
224 * Array of watch entries.
226 struct GNUNET_STATISTICS_WatchEntry **watches;
229 * Task doing exponential back-off trying to reconnect.
231 GNUNET_SCHEDULER_TaskIdentifier backoff_task;
234 * Time for next connect retry.
236 struct GNUNET_TIME_Relative backoff;
239 * Size of the 'watches' array.
241 unsigned int watches_size;
244 * Should this handle auto-destruct once all actions have
250 * Are we currently receiving from the service?
258 * Schedule the next action to be performed.
260 * @param h statistics handle to reconnect
263 schedule_action (struct GNUNET_STATISTICS_Handle *h);
267 * Transmit request to service that we want to watch
268 * the development of a particular value.
270 * @param h statistics handle
271 * @param watch watch entry of the value to watch
274 schedule_watch_request (struct GNUNET_STATISTICS_Handle *h,
275 struct GNUNET_STATISTICS_WatchEntry *watch)
278 struct GNUNET_STATISTICS_GetHandle *ai;
283 GNUNET_assert (h != NULL);
284 GNUNET_assert (watch != NULL);
286 slen = strlen (watch->subsystem) + 1;
287 nlen = strlen (watch->name) + 1;
288 nsize = sizeof (struct GNUNET_MessageHeader) + slen + nlen;
289 if (nsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
294 ai = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_GetHandle));
296 ai->subsystem = GNUNET_strdup (watch->subsystem);
297 ai->name = GNUNET_strdup (watch->name);
298 ai->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
300 ai->type = ACTION_WATCH;
301 ai->proc = watch->proc;
302 ai->cls = watch->proc_cls;
303 GNUNET_CONTAINER_DLL_insert_tail (h->action_head, h->action_tail,
310 * Free memory associated with the given action item.
312 * @param gh action item to free
315 free_action_item (struct GNUNET_STATISTICS_GetHandle *gh)
317 GNUNET_free_non_null (gh->subsystem);
318 GNUNET_free_non_null (gh->name);
324 * Disconnect from the statistics service.
326 * @param h statistics handle to disconnect from
329 do_disconnect (struct GNUNET_STATISTICS_Handle *h)
331 struct GNUNET_STATISTICS_GetHandle *c;
335 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
338 if (NULL != h->client)
340 GNUNET_CLIENT_disconnect (h->client);
343 h->receiving = GNUNET_NO;
344 if (NULL != (c = h->current))
348 c->cont (c->cls, GNUNET_SYSERR);
349 free_action_item (c);
355 * Try to (re)connect to the statistics service.
357 * @param h statistics handle to reconnect
358 * @return GNUNET_YES on success, GNUNET_NO on failure.
361 try_connect (struct GNUNET_STATISTICS_Handle *h)
363 struct GNUNET_STATISTICS_GetHandle *gh;
364 struct GNUNET_STATISTICS_GetHandle *gn;
367 if (h->backoff_task != GNUNET_SCHEDULER_NO_TASK)
369 if (h->client != NULL)
371 h->client = GNUNET_CLIENT_connect ("statistics", h->cfg);
372 if (h->client != NULL)
375 while (NULL != (gh = gn))
378 if (gh->type == ACTION_WATCH)
380 GNUNET_CONTAINER_DLL_remove (h->action_head,
383 free_action_item (gh);
386 for (i = 0; i < h->watches_size; i++)
388 if (NULL != h->watches[i])
389 schedule_watch_request (h, h->watches[i]);
393 LOG (GNUNET_ERROR_TYPE_DEBUG,
394 "Failed to connect to statistics service!\n");
400 * We've waited long enough, reconnect now.
402 * @param cls the 'struct GNUNET_STATISTICS_Handle' to reconnect
403 * @param tc scheduler context (unused)
406 reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
408 struct GNUNET_STATISTICS_Handle *h = cls;
410 h->backoff_task = GNUNET_SCHEDULER_NO_TASK;
416 * Reconnect at a later time, respecting back-off.
418 * @param h statistics handle
421 reconnect_later (struct GNUNET_STATISTICS_Handle *h)
423 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == h->backoff_task);
426 /* So we are shutting down and the service is not reachable.
427 * Chances are that it's down for good and we are not going to connect to
429 * Give up and don't sync the rest of the data.
432 h->do_destroy = GNUNET_NO;
433 GNUNET_STATISTICS_destroy (h, GNUNET_NO);
437 GNUNET_SCHEDULER_add_delayed (h->backoff, &reconnect_task, h);
438 h->backoff = GNUNET_TIME_relative_multiply (h->backoff, 2);
440 GNUNET_TIME_relative_min (h->backoff, GNUNET_CONSTANTS_SERVICE_TIMEOUT);
445 * Process a 'GNUNET_MESSAGE_TYPE_STATISTICS_VALUE' message.
447 * @param h statistics handle
448 * @param msg message received from the service, never NULL
449 * @return GNUNET_OK if the message was well-formed
452 process_statistics_value_message (struct GNUNET_STATISTICS_Handle *h,
453 const struct GNUNET_MessageHeader *msg)
457 const struct GNUNET_STATISTICS_ReplyMessage *smsg;
460 if (h->current->aborted)
462 LOG (GNUNET_ERROR_TYPE_DEBUG, "Iteration was aborted, ignoring VALUE\n");
463 return GNUNET_OK; /* don't bother */
465 size = ntohs (msg->size);
466 if (size < sizeof (struct GNUNET_STATISTICS_ReplyMessage))
469 return GNUNET_SYSERR;
471 smsg = (const struct GNUNET_STATISTICS_ReplyMessage *) msg;
472 size -= sizeof (struct GNUNET_STATISTICS_ReplyMessage);
474 GNUNET_STRINGS_buffer_tokenize ((const char *) &smsg[1], size, 2,
478 return GNUNET_SYSERR;
480 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received valid statistic on `%s:%s': %llu\n",
481 service, name, GNUNET_ntohll (smsg->value));
483 h->current->proc (h->current->cls, service, name,
484 GNUNET_ntohll (smsg->value),
486 (ntohl (smsg->uid) & GNUNET_STATISTICS_PERSIST_BIT)))
488 LOG (GNUNET_ERROR_TYPE_DEBUG,
489 "Processing of remaining statistics aborted by client.\n");
490 h->current->aborted = GNUNET_YES;
492 LOG (GNUNET_ERROR_TYPE_DEBUG, "VALUE processed successfully\n");
498 * We have received a watch value from the service. Process it.
500 * @param h statistics handle
501 * @param msg the watch value message
502 * @return GNUNET_OK if the message was well-formed, GNUNET_SYSERR if not,
503 * GNUNET_NO if this watch has been cancelled
506 process_watch_value (struct GNUNET_STATISTICS_Handle *h,
507 const struct GNUNET_MessageHeader *msg)
509 const struct GNUNET_STATISTICS_WatchValueMessage *wvm;
510 struct GNUNET_STATISTICS_WatchEntry *w;
513 if (sizeof (struct GNUNET_STATISTICS_WatchValueMessage) != ntohs (msg->size))
516 return GNUNET_SYSERR;
518 wvm = (const struct GNUNET_STATISTICS_WatchValueMessage *) msg;
519 GNUNET_break (0 == ntohl (wvm->reserved));
520 wid = ntohl (wvm->wid);
521 if (wid >= h->watches_size)
524 return GNUNET_SYSERR;
529 (void) w->proc (w->proc_cls, w->subsystem, w->name,
530 GNUNET_ntohll (wvm->value),
531 0 != (ntohl (wvm->flags) & GNUNET_STATISTICS_PERSIST_BIT));
537 * Function called with messages from stats service.
540 * @param msg message received, NULL on timeout or fatal error
543 receive_stats (void *cls, const struct GNUNET_MessageHeader *msg)
545 struct GNUNET_STATISTICS_Handle *h = cls;
546 struct GNUNET_STATISTICS_GetHandle *c;
551 LOG (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
552 "Error receiving statistics from service, is the service running?\n");
557 switch (ntohs (msg->type))
559 case GNUNET_MESSAGE_TYPE_STATISTICS_END:
560 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received end of statistics marker\n");
561 if (NULL == (c = h->current))
568 h->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
569 if (h->watches_size > 0)
571 GNUNET_CLIENT_receive (h->client, &receive_stats, h,
572 GNUNET_TIME_UNIT_FOREVER_REL);
576 h->receiving = GNUNET_NO;
581 c->cont (c->cls, GNUNET_OK);
582 free_action_item (c);
584 case GNUNET_MESSAGE_TYPE_STATISTICS_VALUE:
585 if (GNUNET_OK != process_statistics_value_message (h, msg))
591 /* finally, look for more! */
592 LOG (GNUNET_ERROR_TYPE_DEBUG,
593 "Processing VALUE done, now reading more\n");
594 GNUNET_CLIENT_receive (h->client, &receive_stats, h,
595 GNUNET_TIME_absolute_get_remaining (h->
597 h->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
599 case GNUNET_MESSAGE_TYPE_STATISTICS_WATCH_VALUE:
601 (ret = process_watch_value (h, msg)))
604 if (GNUNET_NO == ret)
605 h->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
609 h->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
610 GNUNET_assert (h->watches_size > 0);
611 GNUNET_CLIENT_receive (h->client, &receive_stats, h,
612 GNUNET_TIME_UNIT_FOREVER_REL);
624 * Transmit a GET request (and if successful, start to receive
627 * @param handle statistics handle
628 * @param size how many bytes can we write to buf
629 * @param buf where to write requests to the service
630 * @return number of bytes written to buf
633 transmit_get (struct GNUNET_STATISTICS_Handle *handle, size_t size, void *buf)
635 struct GNUNET_STATISTICS_GetHandle *c;
636 struct GNUNET_MessageHeader *hdr;
641 GNUNET_assert (NULL != (c = handle->current));
644 /* timeout / error */
645 LOG (GNUNET_ERROR_TYPE_DEBUG,
646 "Transmission of request for statistics failed!\n");
647 do_disconnect (handle);
648 reconnect_later (handle);
651 slen1 = strlen (c->subsystem) + 1;
652 slen2 = strlen (c->name) + 1;
653 msize = slen1 + slen2 + sizeof (struct GNUNET_MessageHeader);
654 GNUNET_assert (msize <= size);
655 hdr = (struct GNUNET_MessageHeader *) buf;
656 hdr->size = htons (msize);
657 hdr->type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_GET);
658 GNUNET_assert (slen1 + slen2 ==
659 GNUNET_STRINGS_buffer_fill ((char *) &hdr[1], slen1 + slen2, 2,
662 if (GNUNET_YES != handle->receiving)
664 LOG (GNUNET_ERROR_TYPE_DEBUG,
665 "Transmission of GET done, now reading response\n");
666 handle->receiving = GNUNET_YES;
667 GNUNET_CLIENT_receive (handle->client, &receive_stats, handle,
668 GNUNET_TIME_absolute_get_remaining (c->timeout));
675 * Transmit a WATCH request (and if successful, start to receive
678 * @param handle statistics handle
679 * @param size how many bytes can we write to buf
680 * @param buf where to write requests to the service
681 * @return number of bytes written to buf
684 transmit_watch (struct GNUNET_STATISTICS_Handle *handle, size_t size, void *buf)
686 struct GNUNET_MessageHeader *hdr;
693 /* timeout / error */
694 LOG (GNUNET_ERROR_TYPE_DEBUG,
695 "Transmission of request for statistics failed!\n");
696 do_disconnect (handle);
697 reconnect_later (handle);
700 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting watch request for `%s'\n",
701 handle->current->name);
702 slen1 = strlen (handle->current->subsystem) + 1;
703 slen2 = strlen (handle->current->name) + 1;
704 msize = slen1 + slen2 + sizeof (struct GNUNET_MessageHeader);
705 GNUNET_assert (msize <= size);
706 hdr = (struct GNUNET_MessageHeader *) buf;
707 hdr->size = htons (msize);
708 hdr->type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_WATCH);
709 GNUNET_assert (slen1 + slen2 ==
710 GNUNET_STRINGS_buffer_fill ((char *) &hdr[1], slen1 + slen2, 2,
711 handle->current->subsystem,
712 handle->current->name));
713 if (GNUNET_YES != handle->receiving)
715 handle->receiving = GNUNET_YES;
716 GNUNET_CLIENT_receive (handle->client, &receive_stats, handle,
717 GNUNET_TIME_UNIT_FOREVER_REL);
719 GNUNET_assert (NULL == handle->current->cont);
720 free_action_item (handle->current);
721 handle->current = NULL;
727 * Transmit a SET/UPDATE request.
729 * @param handle statistics handle
730 * @param size how many bytes can we write to buf
731 * @param buf where to write requests to the service
732 * @return number of bytes written to buf
735 transmit_set (struct GNUNET_STATISTICS_Handle *handle, size_t size, void *buf)
737 struct GNUNET_STATISTICS_SetMessage *r;
744 do_disconnect (handle);
745 reconnect_later (handle);
748 slen = strlen (handle->current->subsystem) + 1;
749 nlen = strlen (handle->current->name) + 1;
750 nsize = sizeof (struct GNUNET_STATISTICS_SetMessage) + slen + nlen;
754 do_disconnect (handle);
755 reconnect_later (handle);
759 r->header.size = htons (nsize);
760 r->header.type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_SET);
762 r->value = GNUNET_htonll (handle->current->value);
763 if (handle->current->make_persistent)
764 r->flags |= htonl (GNUNET_STATISTICS_SETFLAG_PERSISTENT);
765 if (handle->current->type == ACTION_UPDATE)
766 r->flags |= htonl (GNUNET_STATISTICS_SETFLAG_RELATIVE);
767 GNUNET_assert (slen + nlen ==
768 GNUNET_STRINGS_buffer_fill ((char *) &r[1], slen + nlen, 2,
769 handle->current->subsystem,
770 handle->current->name));
771 GNUNET_assert (NULL == handle->current->cont);
772 free_action_item (handle->current);
773 handle->current = NULL;
779 * Function called when we are ready to transmit a request to the service.
781 * @param cls the 'struct GNUNET_STATISTICS_Handle'
782 * @param size how many bytes can we write to buf
783 * @param buf where to write requests to the service
784 * @return number of bytes written to buf
787 transmit_action (void *cls, size_t size, void *buf)
789 struct GNUNET_STATISTICS_Handle *h = cls;
794 if (NULL != h->current)
795 switch (h->current->type)
798 ret = transmit_get (h, size, buf);
802 ret = transmit_set (h, size, buf);
805 ret = transmit_watch (h, size, buf);
817 * Get handle for the statistics service.
819 * @param subsystem name of subsystem using the service
820 * @param cfg services configuration in use
821 * @return handle to use
823 struct GNUNET_STATISTICS_Handle *
824 GNUNET_STATISTICS_create (const char *subsystem,
825 const struct GNUNET_CONFIGURATION_Handle *cfg)
827 struct GNUNET_STATISTICS_Handle *ret;
829 GNUNET_assert (subsystem != NULL);
830 GNUNET_assert (cfg != NULL);
831 ret = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_Handle));
833 ret->subsystem = GNUNET_strdup (subsystem);
834 ret->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
840 * Destroy a handle (free all state associated with
843 * @param h statistics handle to destroy
844 * @param sync_first set to GNUNET_YES if pending SET requests should
848 GNUNET_STATISTICS_destroy (struct GNUNET_STATISTICS_Handle *h, int sync_first)
850 struct GNUNET_STATISTICS_GetHandle *pos;
851 struct GNUNET_STATISTICS_GetHandle *next;
852 struct GNUNET_TIME_Relative timeout;
857 GNUNET_assert (GNUNET_NO == h->do_destroy); // Don't call twice.
858 if (GNUNET_SCHEDULER_NO_TASK != h->backoff_task)
860 GNUNET_SCHEDULER_cancel (h->backoff_task);
861 h->backoff_task = GNUNET_SCHEDULER_NO_TASK;
865 if (h->current != NULL)
867 if (h->current->type == ACTION_GET)
869 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
871 free_action_item (h->current);
875 next = h->action_head;
876 while (NULL != (pos = next))
879 if (pos->type == ACTION_GET)
881 GNUNET_CONTAINER_DLL_remove (h->action_head,
884 free_action_item (pos);
887 if ( (NULL == h->current) &&
888 (NULL != (h->current = h->action_head)) )
889 GNUNET_CONTAINER_DLL_remove (h->action_head,
892 h->do_destroy = GNUNET_YES;
893 if ((h->current != NULL) && (h->th == NULL))
895 if (NULL == h->client)
897 /* instant-connect (regardless of back-off) to submit final value */
898 h->client = GNUNET_CLIENT_connect ("statistics", h->cfg);
900 if (NULL != h->client)
902 timeout = GNUNET_TIME_absolute_get_remaining (h->current->timeout);
904 GNUNET_CLIENT_notify_transmit_ready (h->client, h->current->msize,
906 &transmit_action, h);
907 GNUNET_assert (NULL != h->th);
911 return; /* do not finish destruction just yet */
913 while (NULL != (pos = h->action_head))
915 GNUNET_CONTAINER_DLL_remove (h->action_head,
918 free_action_item (pos);
921 for (i = 0; i < h->watches_size; i++)
923 if (NULL == h->watches[i])
925 GNUNET_free (h->watches[i]->subsystem);
926 GNUNET_free (h->watches[i]->name);
927 GNUNET_free (h->watches[i]);
929 GNUNET_array_grow (h->watches, h->watches_size, 0);
930 GNUNET_free (h->subsystem);
936 * Schedule the next action to be performed.
938 * @param h statistics handle
941 schedule_action (struct GNUNET_STATISTICS_Handle *h)
943 struct GNUNET_TIME_Relative timeout;
945 if ( (h->th != NULL) ||
946 (h->backoff_task != GNUNET_SCHEDULER_NO_TASK) )
947 return; /* action already pending */
948 if (GNUNET_YES != try_connect (h))
953 if (NULL != h->current)
954 return; /* action already pending */
955 /* schedule next action */
956 h->current = h->action_head;
957 if (NULL == h->current)
961 h->do_destroy = GNUNET_NO;
962 GNUNET_STATISTICS_destroy (h, GNUNET_YES);
966 GNUNET_CONTAINER_DLL_remove (h->action_head, h->action_tail, h->current);
967 timeout = GNUNET_TIME_absolute_get_remaining (h->current->timeout);
970 GNUNET_CLIENT_notify_transmit_ready (h->client, h->current->msize,
972 &transmit_action, h)))
974 LOG (GNUNET_ERROR_TYPE_DEBUG,
975 "Failed to transmit request to statistics service.\n");
983 * Get statistic from the peer.
985 * @param handle identification of the statistics service
986 * @param subsystem limit to the specified subsystem, NULL for our subsystem
987 * @param name name of the statistic value, NULL for all values
988 * @param timeout after how long should we give up (and call
989 * cont with an error code)?
990 * @param cont continuation to call when done (can be NULL)
991 * @param proc function to call on each value
992 * @param cls closure for cont and proc
993 * @return NULL on error
995 struct GNUNET_STATISTICS_GetHandle *
996 GNUNET_STATISTICS_get (struct GNUNET_STATISTICS_Handle *handle,
997 const char *subsystem, const char *name,
998 struct GNUNET_TIME_Relative timeout,
999 GNUNET_STATISTICS_Callback cont,
1000 GNUNET_STATISTICS_Iterator proc, void *cls)
1004 struct GNUNET_STATISTICS_GetHandle *ai;
1008 GNUNET_assert (proc != NULL);
1009 GNUNET_assert (GNUNET_NO == handle->do_destroy);
1010 if (subsystem == NULL)
1014 slen1 = strlen (subsystem) + 1;
1015 slen2 = strlen (name) + 1;
1016 GNUNET_assert (slen1 + slen2 + sizeof (struct GNUNET_MessageHeader) <
1017 GNUNET_SERVER_MAX_MESSAGE_SIZE);
1018 ai = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_GetHandle));
1020 ai->subsystem = GNUNET_strdup (subsystem);
1021 ai->name = GNUNET_strdup (name);
1025 ai->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1026 ai->type = ACTION_GET;
1027 ai->msize = slen1 + slen2 + sizeof (struct GNUNET_MessageHeader);
1028 GNUNET_CONTAINER_DLL_insert_tail (handle->action_head, handle->action_tail,
1030 schedule_action (handle);
1036 * Cancel a 'get' request. Must be called before the 'cont'
1037 * function is called.
1039 * @param gh handle of the request to cancel
1042 GNUNET_STATISTICS_get_cancel (struct GNUNET_STATISTICS_GetHandle *gh)
1046 if (gh->sh->current == gh)
1048 gh->aborted = GNUNET_YES;
1052 GNUNET_CONTAINER_DLL_remove (gh->sh->action_head, gh->sh->action_tail, gh);
1053 GNUNET_free (gh->name);
1054 GNUNET_free (gh->subsystem);
1061 * Watch statistics from the peer (be notified whenever they change).
1063 * @param handle identification of the statistics service
1064 * @param subsystem limit to the specified subsystem, never NULL
1065 * @param name name of the statistic value, never NULL
1066 * @param proc function to call on each value
1067 * @param proc_cls closure for proc
1068 * @return GNUNET_OK on success, GNUNET_SYSERR on error
1071 GNUNET_STATISTICS_watch (struct GNUNET_STATISTICS_Handle *handle,
1072 const char *subsystem, const char *name,
1073 GNUNET_STATISTICS_Iterator proc, void *proc_cls)
1075 struct GNUNET_STATISTICS_WatchEntry *w;
1078 return GNUNET_SYSERR;
1079 w = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_WatchEntry));
1080 w->subsystem = GNUNET_strdup (subsystem);
1081 w->name = GNUNET_strdup (name);
1083 w->proc_cls = proc_cls;
1084 GNUNET_array_append (handle->watches, handle->watches_size, w);
1085 schedule_watch_request (handle, w);
1091 * Stop watching statistics from the peer.
1093 * @param handle identification of the statistics service
1094 * @param subsystem limit to the specified subsystem, never NULL
1095 * @param name name of the statistic value, never NULL
1096 * @param proc function to call on each value
1097 * @param proc_cls closure for proc
1098 * @return GNUNET_OK on success, GNUNET_SYSERR on error (no such watch)
1101 GNUNET_STATISTICS_watch_cancel (struct GNUNET_STATISTICS_Handle *handle,
1102 const char *subsystem, const char *name,
1103 GNUNET_STATISTICS_Iterator proc, void *proc_cls)
1105 struct GNUNET_STATISTICS_WatchEntry *w;
1109 return GNUNET_SYSERR;
1110 for (i=0;i<handle->watches_size;i++)
1112 w = handle->watches[i];
1113 if ( (w->proc == proc) &&
1114 (w->proc_cls == proc_cls) &&
1115 (0 == strcmp (w->name, name)) &&
1116 (0 == strcmp (w->subsystem, subsystem)) )
1118 GNUNET_free (w->name);
1119 GNUNET_free (w->subsystem);
1121 handle->watches[i] = NULL;
1125 return GNUNET_SYSERR;
1131 * Queue a request to change a statistic.
1133 * @param h statistics handle
1134 * @param name name of the value
1135 * @param make_persistent should the value be kept across restarts?
1136 * @param value new value or change
1137 * @param type type of the action (ACTION_SET or ACTION_UPDATE)
1140 add_setter_action (struct GNUNET_STATISTICS_Handle *h, const char *name,
1141 int make_persistent, uint64_t value, enum ActionType type)
1143 struct GNUNET_STATISTICS_GetHandle *ai;
1149 GNUNET_assert (h != NULL);
1150 GNUNET_assert (name != NULL);
1151 slen = strlen (h->subsystem) + 1;
1152 nlen = strlen (name) + 1;
1153 nsize = sizeof (struct GNUNET_STATISTICS_SetMessage) + slen + nlen;
1154 if (nsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1159 for (ai = h->action_head; ai != NULL; ai = ai->next)
1161 if (! ( (0 == strcmp (ai->subsystem, h->subsystem)) &&
1162 (0 == strcmp (ai->name, name)) &&
1163 ( (ai->type == ACTION_UPDATE) ||
1164 (ai->type == ACTION_SET) ) ) )
1166 if (ai->type == ACTION_SET)
1168 if (type == ACTION_UPDATE)
1170 delta = (int64_t) value;
1173 /* update old set by new delta */
1178 /* update old set by new delta, but never go negative */
1179 if (ai->value < -delta)
1187 /* new set overrides old set */
1193 if (type == ACTION_UPDATE)
1195 /* make delta cummulative */
1196 delta = (int64_t) value;
1201 /* drop old 'update', use new 'set' instead */
1206 ai->timeout = GNUNET_TIME_relative_to_absolute (SET_TRANSMIT_TIMEOUT);
1207 ai->make_persistent = make_persistent;
1210 /* no existing entry matches, create a fresh one */
1211 ai = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_GetHandle));
1213 ai->subsystem = GNUNET_strdup (h->subsystem);
1214 ai->name = GNUNET_strdup (name);
1215 ai->timeout = GNUNET_TIME_relative_to_absolute (SET_TRANSMIT_TIMEOUT);
1216 ai->make_persistent = make_persistent;
1220 GNUNET_CONTAINER_DLL_insert_tail (h->action_head, h->action_tail,
1222 schedule_action (h);
1227 * Set statistic value for the peer. Will always use our
1228 * subsystem (the argument used when "handle" was created).
1230 * @param handle identification of the statistics service
1231 * @param name name of the statistic value
1232 * @param value new value to set
1233 * @param make_persistent should the value be kept across restarts?
1236 GNUNET_STATISTICS_set (struct GNUNET_STATISTICS_Handle *handle,
1237 const char *name, uint64_t value, int make_persistent)
1241 GNUNET_assert (GNUNET_NO == handle->do_destroy);
1242 add_setter_action (handle, name, make_persistent, value, ACTION_SET);
1247 * Set statistic value for the peer. Will always use our
1248 * subsystem (the argument used when "handle" was created).
1250 * @param handle identification of the statistics service
1251 * @param name name of the statistic value
1252 * @param delta change in value (added to existing value)
1253 * @param make_persistent should the value be kept across restarts?
1256 GNUNET_STATISTICS_update (struct GNUNET_STATISTICS_Handle *handle,
1257 const char *name, int64_t delta, int make_persistent)
1263 GNUNET_assert (GNUNET_NO == handle->do_destroy);
1264 add_setter_action (handle, name, make_persistent, (uint64_t) delta,
1269 /* end of statistics_api.c */