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
8 option) any later version.
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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,
18 Boston, MA 02111-1307, USA.
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 slen = strlen (watch->subsystem) + 1;
285 nlen = strlen (watch->name) + 1;
286 nsize = sizeof (struct GNUNET_MessageHeader) + slen + nlen;
287 if (nsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
292 ai = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_GetHandle));
294 ai->subsystem = GNUNET_strdup (watch->subsystem);
295 ai->name = GNUNET_strdup (watch->name);
296 ai->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
298 ai->type = ACTION_WATCH;
299 ai->proc = watch->proc;
300 ai->cls = watch->proc_cls;
301 GNUNET_CONTAINER_DLL_insert_tail (h->action_head, h->action_tail,
308 * Free memory associated with the given action item.
310 * @param gh action item to free
313 free_action_item (struct GNUNET_STATISTICS_GetHandle *gh)
315 GNUNET_free_non_null (gh->subsystem);
316 GNUNET_free_non_null (gh->name);
322 * Disconnect from the statistics service.
324 * @param h statistics handle to disconnect from
327 do_disconnect (struct GNUNET_STATISTICS_Handle *h)
329 struct GNUNET_STATISTICS_GetHandle *c;
333 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
336 if (NULL != h->client)
338 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
341 h->receiving = GNUNET_NO;
342 if (NULL != (c = h->current))
346 c->cont (c->cls, GNUNET_SYSERR);
347 free_action_item (c);
353 * Try to (re)connect to the statistics service.
355 * @param h statistics handle to reconnect
356 * @return GNUNET_YES on success, GNUNET_NO on failure.
359 try_connect (struct GNUNET_STATISTICS_Handle *h)
361 struct GNUNET_STATISTICS_GetHandle *gh;
362 struct GNUNET_STATISTICS_GetHandle *gn;
365 if (h->backoff_task != GNUNET_SCHEDULER_NO_TASK)
367 if (h->client != NULL)
369 h->client = GNUNET_CLIENT_connect ("statistics", h->cfg);
370 if (h->client != NULL)
373 while (NULL != (gh = gn))
376 if (gh->type == ACTION_WATCH)
378 GNUNET_CONTAINER_DLL_remove (h->action_head,
381 free_action_item (gh);
384 for (i = 0; i < h->watches_size; i++)
385 schedule_watch_request (h, h->watches[i]);
389 LOG (GNUNET_ERROR_TYPE_DEBUG,
390 _("Failed to connect to statistics service!\n"));
397 * We've waited long enough, reconnect now.
399 * @param cls the 'struct GNUNET_STATISTICS_Handle' to reconnect
400 * @param tc scheduler context (unused)
403 reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
405 struct GNUNET_STATISTICS_Handle *h = cls;
407 h->backoff_task = GNUNET_SCHEDULER_NO_TASK;
413 * Reconnect at a later time, respecting back-off.
415 * @param h statistics handle
418 reconnect_later (struct GNUNET_STATISTICS_Handle *h)
420 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == h->backoff_task);
422 GNUNET_SCHEDULER_add_delayed (h->backoff, &reconnect_task, h);
423 h->backoff = GNUNET_TIME_relative_multiply (h->backoff, 2);
425 GNUNET_TIME_relative_min (h->backoff, GNUNET_CONSTANTS_SERVICE_TIMEOUT);
430 * Process a 'GNUNET_MESSAGE_TYPE_STATISTICS_VALUE' message.
432 * @param h statistics handle
433 * @param msg message received from the service, never NULL
434 * @return GNUNET_OK if the message was well-formed
437 process_statistics_value_message (struct GNUNET_STATISTICS_Handle *h,
438 const struct GNUNET_MessageHeader *msg)
442 const struct GNUNET_STATISTICS_ReplyMessage *smsg;
445 if (h->current->aborted)
448 LOG (GNUNET_ERROR_TYPE_DEBUG, "Iteration was aborted, ignoring VALUE\n");
450 return GNUNET_OK; /* don't bother */
452 size = ntohs (msg->size);
453 if (size < sizeof (struct GNUNET_STATISTICS_ReplyMessage))
456 return GNUNET_SYSERR;
458 smsg = (const struct GNUNET_STATISTICS_ReplyMessage *) msg;
459 size -= sizeof (struct GNUNET_STATISTICS_ReplyMessage);
461 GNUNET_STRINGS_buffer_tokenize ((const char *) &smsg[1], size, 2,
465 return GNUNET_SYSERR;
468 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received valid statistic on `%s:%s': %llu\n",
469 service, name, GNUNET_ntohll (smsg->value));
472 h->current->proc (h->current->cls, service, name,
473 GNUNET_ntohll (smsg->value),
475 (ntohl (smsg->uid) & GNUNET_STATISTICS_PERSIST_BIT)))
478 LOG (GNUNET_ERROR_TYPE_DEBUG,
479 "Processing of remaining statistics aborted by client.\n");
481 h->current->aborted = GNUNET_YES;
484 LOG (GNUNET_ERROR_TYPE_DEBUG, "VALUE processed successfully\n");
491 * We have received a watch value from the service. Process it.
493 * @param h statistics handle
494 * @param msg the watch value message
495 * @return GNUNET_OK if the message was well-formed, GNUNET_SYSERR if not,
496 * GNUNET_NO if this watch has been cancelled
499 process_watch_value (struct GNUNET_STATISTICS_Handle *h,
500 const struct GNUNET_MessageHeader *msg)
502 const struct GNUNET_STATISTICS_WatchValueMessage *wvm;
503 struct GNUNET_STATISTICS_WatchEntry *w;
506 if (sizeof (struct GNUNET_STATISTICS_WatchValueMessage) != ntohs (msg->size))
509 return GNUNET_SYSERR;
511 wvm = (const struct GNUNET_STATISTICS_WatchValueMessage *) msg;
512 GNUNET_break (0 == ntohl (wvm->reserved));
513 wid = ntohl (wvm->wid);
514 if (wid >= h->watches_size)
517 return GNUNET_SYSERR;
522 (void) w->proc (w->proc_cls, w->subsystem, w->name,
523 GNUNET_ntohll (wvm->value),
524 0 != (ntohl (wvm->flags) & GNUNET_STATISTICS_PERSIST_BIT));
530 * Function called with messages from stats service.
533 * @param msg message received, NULL on timeout or fatal error
536 receive_stats (void *cls, const struct GNUNET_MessageHeader *msg)
538 struct GNUNET_STATISTICS_Handle *h = cls;
539 struct GNUNET_STATISTICS_GetHandle *c;
545 LOG (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
546 "Error receiving statistics from service, is the service running?\n");
552 switch (ntohs (msg->type))
554 case GNUNET_MESSAGE_TYPE_STATISTICS_END:
556 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received end of statistics marker\n");
558 if (NULL == (c = h->current))
565 h->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
566 if (h->watches_size > 0)
568 GNUNET_CLIENT_receive (h->client, &receive_stats, h,
569 GNUNET_TIME_UNIT_FOREVER_REL);
573 h->receiving = GNUNET_NO;
578 c->cont (c->cls, GNUNET_OK);
579 free_action_item (c);
581 case GNUNET_MESSAGE_TYPE_STATISTICS_VALUE:
582 if (GNUNET_OK != process_statistics_value_message (h, msg))
588 /* finally, look for more! */
590 LOG (GNUNET_ERROR_TYPE_DEBUG,
591 "Processing VALUE done, now reading more\n");
593 GNUNET_CLIENT_receive (h->client, &receive_stats, h,
594 GNUNET_TIME_absolute_get_remaining (h->
596 h->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
598 case GNUNET_MESSAGE_TYPE_STATISTICS_WATCH_VALUE:
600 (ret = process_watch_value (h, msg)))
603 if (GNUNET_NO == ret)
604 h->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
608 h->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
609 GNUNET_assert (h->watches_size > 0);
610 GNUNET_CLIENT_receive (h->client, &receive_stats, h,
611 GNUNET_TIME_UNIT_FOREVER_REL);
623 * Transmit a GET request (and if successful, start to receive
626 * @param handle statistics handle
627 * @param size how many bytes can we write to buf
628 * @param buf where to write requests to the service
629 * @return number of bytes written to buf
632 transmit_get (struct GNUNET_STATISTICS_Handle *handle, size_t size, void *buf)
634 struct GNUNET_STATISTICS_GetHandle *c;
635 struct GNUNET_MessageHeader *hdr;
640 GNUNET_assert (NULL != (c = handle->current));
643 /* timeout / error */
645 LOG (GNUNET_ERROR_TYPE_DEBUG,
646 "Transmission of request for statistics failed!\n");
648 do_disconnect (handle);
649 reconnect_later (handle);
652 slen1 = strlen (c->subsystem) + 1;
653 slen2 = strlen (c->name) + 1;
654 msize = slen1 + slen2 + sizeof (struct GNUNET_MessageHeader);
655 GNUNET_assert (msize <= size);
656 hdr = (struct GNUNET_MessageHeader *) buf;
657 hdr->size = htons (msize);
658 hdr->type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_GET);
659 GNUNET_assert (slen1 + slen2 ==
660 GNUNET_STRINGS_buffer_fill ((char *) &hdr[1], slen1 + slen2, 2,
663 if (GNUNET_YES != handle->receiving)
666 LOG (GNUNET_ERROR_TYPE_DEBUG,
667 "Transmission of GET done, now reading response\n");
669 handle->receiving = GNUNET_YES;
670 GNUNET_CLIENT_receive (handle->client, &receive_stats, handle,
671 GNUNET_TIME_absolute_get_remaining (c->timeout));
678 * Transmit a WATCH request (and if successful, start to receive
681 * @param handle statistics handle
682 * @param size how many bytes can we write to buf
683 * @param buf where to write requests to the service
684 * @return number of bytes written to buf
687 transmit_watch (struct GNUNET_STATISTICS_Handle *handle, size_t size, void *buf)
689 struct GNUNET_MessageHeader *hdr;
696 /* timeout / error */
698 LOG (GNUNET_ERROR_TYPE_DEBUG,
699 "Transmission of request for statistics failed!\n");
701 do_disconnect (handle);
702 reconnect_later (handle);
706 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting watch request for `%s'\n",
707 handle->current->name);
709 slen1 = strlen (handle->current->subsystem) + 1;
710 slen2 = strlen (handle->current->name) + 1;
711 msize = slen1 + slen2 + sizeof (struct GNUNET_MessageHeader);
712 GNUNET_assert (msize <= size);
713 hdr = (struct GNUNET_MessageHeader *) buf;
714 hdr->size = htons (msize);
715 hdr->type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_WATCH);
716 GNUNET_assert (slen1 + slen2 ==
717 GNUNET_STRINGS_buffer_fill ((char *) &hdr[1], slen1 + slen2, 2,
718 handle->current->subsystem,
719 handle->current->name));
720 if (GNUNET_YES != handle->receiving)
722 handle->receiving = GNUNET_YES;
723 GNUNET_CLIENT_receive (handle->client, &receive_stats, handle,
724 GNUNET_TIME_UNIT_FOREVER_REL);
726 GNUNET_assert (NULL == handle->current->cont);
727 free_action_item (handle->current);
728 handle->current = NULL;
734 * Transmit a SET/UPDATE request.
736 * @param handle statistics handle
737 * @param size how many bytes can we write to buf
738 * @param buf where to write requests to the service
739 * @return number of bytes written to buf
742 transmit_set (struct GNUNET_STATISTICS_Handle *handle, size_t size, void *buf)
744 struct GNUNET_STATISTICS_SetMessage *r;
751 do_disconnect (handle);
752 reconnect_later (handle);
755 slen = strlen (handle->current->subsystem) + 1;
756 nlen = strlen (handle->current->name) + 1;
757 nsize = sizeof (struct GNUNET_STATISTICS_SetMessage) + slen + nlen;
761 do_disconnect (handle);
762 reconnect_later (handle);
766 r->header.size = htons (nsize);
767 r->header.type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_SET);
769 r->value = GNUNET_htonll (handle->current->value);
770 if (handle->current->make_persistent)
771 r->flags |= htonl (GNUNET_STATISTICS_SETFLAG_PERSISTENT);
772 if (handle->current->type == ACTION_UPDATE)
773 r->flags |= htonl (GNUNET_STATISTICS_SETFLAG_RELATIVE);
774 GNUNET_assert (slen + nlen ==
775 GNUNET_STRINGS_buffer_fill ((char *) &r[1], slen + nlen, 2,
776 handle->current->subsystem,
777 handle->current->name));
778 GNUNET_assert (NULL == handle->current->cont);
779 free_action_item (handle->current);
780 handle->current = NULL;
786 * Function called when we are ready to transmit a request to the service.
788 * @param cls the 'struct GNUNET_STATISTICS_Handle'
789 * @param size how many bytes can we write to buf
790 * @param buf where to write requests to the service
791 * @return number of bytes written to buf
794 transmit_action (void *cls, size_t size, void *buf)
796 struct GNUNET_STATISTICS_Handle *h = cls;
801 if (NULL != h->current)
802 switch (h->current->type)
805 ret = transmit_get (h, size, buf);
809 ret = transmit_set (h, size, buf);
812 ret = transmit_watch (h, size, buf);
824 * Get handle for the statistics service.
826 * @param subsystem name of subsystem using the service
827 * @param cfg services configuration in use
828 * @return handle to use
830 struct GNUNET_STATISTICS_Handle *
831 GNUNET_STATISTICS_create (const char *subsystem,
832 const struct GNUNET_CONFIGURATION_Handle *cfg)
834 struct GNUNET_STATISTICS_Handle *ret;
836 GNUNET_assert (subsystem != NULL);
837 GNUNET_assert (cfg != NULL);
838 ret = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_Handle));
840 ret->subsystem = GNUNET_strdup (subsystem);
841 ret->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
847 * Destroy a handle (free all state associated with
850 * @param h statistics handle to destroy
851 * @param sync_first set to GNUNET_YES if pending SET requests should
855 GNUNET_STATISTICS_destroy (struct GNUNET_STATISTICS_Handle *h, int sync_first)
857 struct GNUNET_STATISTICS_GetHandle *pos;
858 struct GNUNET_STATISTICS_GetHandle *next;
859 struct GNUNET_TIME_Relative timeout;
864 if (GNUNET_SCHEDULER_NO_TASK != h->backoff_task)
866 GNUNET_SCHEDULER_cancel (h->backoff_task);
867 h->backoff_task = GNUNET_SCHEDULER_NO_TASK;
871 if (h->current != NULL)
873 if (h->current->type == ACTION_GET)
875 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
877 free_action_item (h->current);
881 next = h->action_head;
882 while (NULL != (pos = next))
885 if (pos->type == ACTION_GET)
887 GNUNET_CONTAINER_DLL_remove (h->action_head,
890 free_action_item (pos);
893 if ( (NULL == h->current) &&
894 (NULL != (h->current = h->action_head)) )
895 GNUNET_CONTAINER_DLL_remove (h->action_head,
898 h->do_destroy = GNUNET_YES;
899 if ((h->current != NULL) && (h->th == NULL))
901 if (NULL == h->client)
903 /* instant-connect (regardless of back-off) to submit final value */
904 h->client = GNUNET_CLIENT_connect ("statistics", h->cfg);
906 if (NULL != h->client)
908 timeout = GNUNET_TIME_absolute_get_remaining (h->current->timeout);
910 GNUNET_CLIENT_notify_transmit_ready (h->client, h->current->msize,
912 &transmit_action, h);
913 GNUNET_assert (NULL != h->th);
917 return; /* do not finish destruction just yet */
919 while (NULL != (pos = h->action_head))
921 GNUNET_CONTAINER_DLL_remove (h->action_head,
924 free_action_item (pos);
927 for (i = 0; i < h->watches_size; i++)
929 if (NULL == h->watches[i])
931 GNUNET_free (h->watches[i]->subsystem);
932 GNUNET_free (h->watches[i]->name);
933 GNUNET_free (h->watches[i]);
935 GNUNET_array_grow (h->watches, h->watches_size, 0);
936 GNUNET_free (h->subsystem);
942 * Schedule the next action to be performed.
944 * @param h statistics handle
947 schedule_action (struct GNUNET_STATISTICS_Handle *h)
949 struct GNUNET_TIME_Relative timeout;
951 if ( (h->th != NULL) ||
952 (h->backoff_task != GNUNET_SCHEDULER_NO_TASK) )
953 return; /* action already pending */
954 if (GNUNET_YES != try_connect (h))
959 if (NULL != h->current)
960 return; /* action already pending */
961 /* schedule next action */
962 h->current = h->action_head;
963 if (NULL == h->current)
967 h->do_destroy = GNUNET_NO;
968 GNUNET_STATISTICS_destroy (h, GNUNET_YES);
972 GNUNET_CONTAINER_DLL_remove (h->action_head, h->action_tail, h->current);
973 timeout = GNUNET_TIME_absolute_get_remaining (h->current->timeout);
976 GNUNET_CLIENT_notify_transmit_ready (h->client, h->current->msize,
978 &transmit_action, h)))
981 LOG (GNUNET_ERROR_TYPE_DEBUG,
982 "Failed to transmit request to statistics service.\n");
991 * Get statistic from the peer.
993 * @param handle identification of the statistics service
994 * @param subsystem limit to the specified subsystem, NULL for our subsystem
995 * @param name name of the statistic value, NULL for all values
996 * @param timeout after how long should we give up (and call
997 * cont with an error code)?
998 * @param cont continuation to call when done (can be NULL)
999 * @param proc function to call on each value
1000 * @param cls closure for cont and proc
1001 * @return NULL on error
1003 struct GNUNET_STATISTICS_GetHandle *
1004 GNUNET_STATISTICS_get (struct GNUNET_STATISTICS_Handle *handle,
1005 const char *subsystem, const char *name,
1006 struct GNUNET_TIME_Relative timeout,
1007 GNUNET_STATISTICS_Callback cont,
1008 GNUNET_STATISTICS_Iterator proc, void *cls)
1012 struct GNUNET_STATISTICS_GetHandle *ai;
1016 GNUNET_assert (proc != NULL);
1017 GNUNET_assert (GNUNET_NO == handle->do_destroy);
1018 if (subsystem == NULL)
1022 slen1 = strlen (subsystem) + 1;
1023 slen2 = strlen (name) + 1;
1024 GNUNET_assert (slen1 + slen2 + sizeof (struct GNUNET_MessageHeader) <
1025 GNUNET_SERVER_MAX_MESSAGE_SIZE);
1026 ai = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_GetHandle));
1028 ai->subsystem = GNUNET_strdup (subsystem);
1029 ai->name = GNUNET_strdup (name);
1033 ai->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1034 ai->type = ACTION_GET;
1035 ai->msize = slen1 + slen2 + sizeof (struct GNUNET_MessageHeader);
1036 GNUNET_CONTAINER_DLL_insert_tail (handle->action_head, handle->action_tail,
1038 schedule_action (handle);
1044 * Cancel a 'get' request. Must be called before the 'cont'
1045 * function is called.
1047 * @param gh handle of the request to cancel
1050 GNUNET_STATISTICS_get_cancel (struct GNUNET_STATISTICS_GetHandle *gh)
1054 if (gh->sh->current == gh)
1056 gh->aborted = GNUNET_YES;
1060 GNUNET_CONTAINER_DLL_remove (gh->sh->action_head, gh->sh->action_tail, gh);
1061 GNUNET_free (gh->name);
1062 GNUNET_free (gh->subsystem);
1069 * Watch statistics from the peer (be notified whenever they change).
1071 * @param handle identification of the statistics service
1072 * @param subsystem limit to the specified subsystem, never NULL
1073 * @param name name of the statistic value, never NULL
1074 * @param proc function to call on each value
1075 * @param proc_cls closure for proc
1076 * @return GNUNET_OK on success, GNUNET_SYSERR on error
1079 GNUNET_STATISTICS_watch (struct GNUNET_STATISTICS_Handle *handle,
1080 const char *subsystem, const char *name,
1081 GNUNET_STATISTICS_Iterator proc, void *proc_cls)
1083 struct GNUNET_STATISTICS_WatchEntry *w;
1086 return GNUNET_SYSERR;
1087 w = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_WatchEntry));
1088 w->subsystem = GNUNET_strdup (subsystem);
1089 w->name = GNUNET_strdup (name);
1091 w->proc_cls = proc_cls;
1092 GNUNET_array_append (handle->watches, handle->watches_size, w);
1093 schedule_watch_request (handle, w);
1099 * Stop watching statistics from the peer.
1101 * @param handle identification of the statistics service
1102 * @param subsystem limit to the specified subsystem, never NULL
1103 * @param name name of the statistic value, never NULL
1104 * @param proc function to call on each value
1105 * @param proc_cls closure for proc
1106 * @return GNUNET_OK on success, GNUNET_SYSERR on error (no such watch)
1109 GNUNET_STATISTICS_watch_cancel (struct GNUNET_STATISTICS_Handle *handle,
1110 const char *subsystem, const char *name,
1111 GNUNET_STATISTICS_Iterator proc, void *proc_cls)
1113 struct GNUNET_STATISTICS_WatchEntry *w;
1117 return GNUNET_SYSERR;
1118 for (i=0;i<handle->watches_size;i++)
1120 w = handle->watches[i];
1121 if ( (w->proc == proc) &&
1122 (w->proc_cls == proc_cls) &&
1123 (0 == strcmp (w->name, name)) &&
1124 (0 == strcmp (w->subsystem, subsystem)) )
1126 GNUNET_free (w->name);
1127 GNUNET_free (w->subsystem);
1129 handle->watches[i] = NULL;
1133 return GNUNET_SYSERR;
1139 * Queue a request to change a statistic.
1141 * @param h statistics handle
1142 * @param name name of the value
1143 * @param make_persistent should the value be kept across restarts?
1144 * @param value new value or change
1145 * @param type type of the action (ACTION_SET or ACTION_UPDATE)
1148 add_setter_action (struct GNUNET_STATISTICS_Handle *h, const char *name,
1149 int make_persistent, uint64_t value, enum ActionType type)
1151 struct GNUNET_STATISTICS_GetHandle *ai;
1157 GNUNET_assert (h != NULL);
1158 GNUNET_assert (name != NULL);
1159 slen = strlen (h->subsystem) + 1;
1160 nlen = strlen (name) + 1;
1161 nsize = sizeof (struct GNUNET_STATISTICS_SetMessage) + slen + nlen;
1162 if (nsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1167 for (ai = h->action_head; ai != NULL; ai = ai->next)
1169 if (! ( (0 == strcmp (ai->subsystem, h->subsystem)) &&
1170 (0 == strcmp (ai->name, name)) &&
1171 ( (ai->type == ACTION_UPDATE) ||
1172 (ai->type == ACTION_SET) ) ) )
1174 if (ai->type == ACTION_SET)
1176 if (type == ACTION_UPDATE)
1178 delta = (int64_t) value;
1181 /* update old set by new delta */
1186 /* update old set by new delta, but never go negative */
1187 if (ai->value < -delta)
1195 /* new set overrides old set */
1201 if (type == ACTION_UPDATE)
1203 /* make delta cummulative */
1204 delta = (int64_t) value;
1209 /* drop old 'update', use new 'set' instead */
1214 ai->timeout = GNUNET_TIME_relative_to_absolute (SET_TRANSMIT_TIMEOUT);
1215 ai->make_persistent = make_persistent;
1218 /* no existing entry matches, create a fresh one */
1219 ai = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_GetHandle));
1221 ai->subsystem = GNUNET_strdup (h->subsystem);
1222 ai->name = GNUNET_strdup (name);
1223 ai->timeout = GNUNET_TIME_relative_to_absolute (SET_TRANSMIT_TIMEOUT);
1224 ai->make_persistent = make_persistent;
1228 GNUNET_CONTAINER_DLL_insert_tail (h->action_head, h->action_tail,
1230 schedule_action (h);
1235 * Set statistic value for the peer. Will always use our
1236 * subsystem (the argument used when "handle" was created).
1238 * @param handle identification of the statistics service
1239 * @param name name of the statistic value
1240 * @param value new value to set
1241 * @param make_persistent should the value be kept across restarts?
1244 GNUNET_STATISTICS_set (struct GNUNET_STATISTICS_Handle *handle,
1245 const char *name, uint64_t value, int make_persistent)
1249 GNUNET_assert (GNUNET_NO == handle->do_destroy);
1250 add_setter_action (handle, name, make_persistent, value, ACTION_SET);
1255 * Set statistic value for the peer. Will always use our
1256 * subsystem (the argument used when "handle" was created).
1258 * @param handle identification of the statistics service
1259 * @param name name of the statistic value
1260 * @param delta change in value (added to existing value)
1261 * @param make_persistent should the value be kept across restarts?
1264 GNUNET_STATISTICS_update (struct GNUNET_STATISTICS_Handle *handle,
1265 const char *name, int64_t delta, int make_persistent)
1271 GNUNET_assert (GNUNET_NO == handle->do_destroy);
1272 add_setter_action (handle, name, make_persistent, (uint64_t) delta,
1277 /* end of statistics_api.c */