2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
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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_protocols.h"
29 #include "gnunet_server_lib.h"
30 #include "gnunet_statistics_service.h"
31 #include "gnunet_strings_lib.h"
32 #include "statistics.h"
34 #define SET_TRANSMIT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
49 * Linked list of things we still need to do.
54 * This is a linked list.
56 struct ActionItem *next;
59 * What subsystem is this action about? (can be NULL)
64 * What value is this action about? (can be NULL)
69 * Continuation to call once action is complete.
71 GNUNET_STATISTICS_Callback cont;
74 * Function to call (for GET actions only).
76 GNUNET_STATISTICS_Iterator proc;
79 * Closure for proc and cont.
84 * Timeout for this action.
86 struct GNUNET_TIME_Absolute timeout;
91 unsigned long long value;
94 * Flag for SET/UPDATE actions.
99 * Has the current iteration been aborted; for GET actions.
104 * Is this a GET, SET or UPDATE?
106 enum ActionType type;
109 * Size of the message that we will be transmitting.
117 * Handle for the service.
119 struct GNUNET_STATISTICS_Handle
124 struct GNUNET_SCHEDULER_Handle *sched;
127 * Name of our subsystem.
132 * Configuration to use.
134 const struct GNUNET_CONFIGURATION_Handle *cfg;
137 * Socket (if available).
139 struct GNUNET_CLIENT_Connection *client;
142 * Head of the linked list of pending actions (first action
145 struct ActionItem *action_head;
148 * Tail of the linked list of actions (for fast append).
150 struct ActionItem *action_tail;
153 * Action we are currently busy with (action request has been
154 * transmitted, we're now receiving the response from the
157 struct ActionItem *current;
160 * Should this handle be destroyed once we've processed
169 * Try to (re)connect to the statistics service.
171 * @return GNUNET_YES on success, GNUNET_NO on failure.
174 try_connect (struct GNUNET_STATISTICS_Handle *ret)
176 if (ret->client != NULL)
178 ret->client = GNUNET_CLIENT_connect (ret->sched, "statistics", ret->cfg);
179 if (ret->client != NULL)
182 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
183 _("Failed to connect to statistics service!\n"));
190 * Free memory associated with the given action item.
193 free_action_item (struct ActionItem *ai)
195 GNUNET_free_non_null (ai->subsystem);
196 GNUNET_free_non_null (ai->name);
202 * Get handle for the statistics service.
204 * @param subsystem name of subsystem using the service
205 * @param cfg services configuration in use
206 * @return handle to use
208 struct GNUNET_STATISTICS_Handle *
209 GNUNET_STATISTICS_create (struct GNUNET_SCHEDULER_Handle *sched,
210 const char *subsystem,
211 const struct GNUNET_CONFIGURATION_Handle *cfg)
213 struct GNUNET_STATISTICS_Handle *ret;
215 GNUNET_assert (subsystem != NULL);
216 GNUNET_assert (sched != NULL);
217 GNUNET_assert (cfg != NULL);
218 ret = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_Handle));
221 ret->subsystem = GNUNET_strdup (subsystem);
228 * Actually free the handle.
231 do_destroy (struct GNUNET_STATISTICS_Handle *h)
233 GNUNET_assert (h->action_head == NULL);
234 GNUNET_assert (h->current == NULL);
235 if (h->client != NULL)
237 GNUNET_CLIENT_disconnect (h->client);
240 GNUNET_free (h->subsystem);
246 * Destroy a handle (free all state associated with
250 GNUNET_STATISTICS_destroy (struct GNUNET_STATISTICS_Handle *handle)
252 GNUNET_assert (handle->do_destroy == GNUNET_NO);
253 if ((handle->action_head != NULL) || (handle->current != NULL))
255 handle->do_destroy = GNUNET_YES;
263 * Process the message.
265 * @return GNUNET_OK if the message was well-formed
268 process_message (struct GNUNET_STATISTICS_Handle *h,
269 const struct GNUNET_MessageHeader *msg)
273 const struct GNUNET_STATISTICS_ReplyMessage *smsg;
276 if (h->current->aborted)
277 return GNUNET_OK; /* don't bother */
278 size = ntohs (msg->size);
279 if (size < sizeof (struct GNUNET_STATISTICS_ReplyMessage))
282 return GNUNET_SYSERR;
284 smsg = (const struct GNUNET_STATISTICS_ReplyMessage *) msg;
285 size -= sizeof (struct GNUNET_STATISTICS_ReplyMessage);
286 if (size != GNUNET_STRINGS_buffer_tokenize ((const char *) &smsg[1],
287 size, 2, &service, &name))
290 return GNUNET_SYSERR;
293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
294 "Received valid statistic on `%s:%s': %llu\n",
295 service, name, GNUNET_ntohll (smsg->value));
298 h->current->proc (h->current->cls,
301 GNUNET_ntohll (smsg->value),
303 (ntohl (smsg->uid) & GNUNET_STATISTICS_PERSIST_BIT)))
306 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
307 "Processing of remaining statistics aborted by client.\n");
309 h->current->aborted = GNUNET_YES;
317 * Schedule the next action to be performed.
319 static void schedule_action (struct GNUNET_STATISTICS_Handle *h);
323 * GET processing is complete, tell client about it.
326 finish (struct GNUNET_STATISTICS_Handle *h, int code)
328 struct ActionItem *pos = h->current;
331 if (pos->cont != NULL)
332 pos->cont (pos->cls, code);
333 free_action_item (pos);
338 * Function called with messages from stats service.
341 * @param msg message received, NULL on timeout or fatal error
344 receive_stats (void *cls, const struct GNUNET_MessageHeader *msg)
346 struct GNUNET_STATISTICS_Handle *h = cls;
350 GNUNET_CLIENT_disconnect (h->client);
353 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
354 "Error receiving statistics from service, is the service running?\n" );
356 finish (h, GNUNET_SYSERR);
359 switch (ntohs (msg->type))
361 case GNUNET_MESSAGE_TYPE_STATISTICS_END:
363 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
364 "Received end of statistics marker\n");
366 finish (h, GNUNET_OK);
368 case GNUNET_MESSAGE_TYPE_STATISTICS_VALUE:
369 if (GNUNET_OK == process_message (h, msg))
371 /* finally, look for more! */
372 GNUNET_CLIENT_receive (h->client,
375 GNUNET_TIME_absolute_get_remaining
376 (h->current->timeout));
385 GNUNET_CLIENT_disconnect (h->client);
387 finish (h, GNUNET_SYSERR);
392 * Transmit a GET request (and if successful, start to receive
396 transmit_get (struct GNUNET_STATISTICS_Handle *handle, size_t size, void *buf)
398 struct GNUNET_MessageHeader *hdr;
405 /* timeout / error */
407 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
408 "Transmission of request for statistics failed!\n");
410 finish (handle, GNUNET_SYSERR);
413 slen1 = strlen (handle->current->subsystem) + 1;
414 slen2 = strlen (handle->current->name) + 1;
415 msize = slen1 + slen2 + sizeof (struct GNUNET_MessageHeader);
416 GNUNET_assert (msize <= size);
417 hdr = (struct GNUNET_MessageHeader *) buf;
418 hdr->size = htons (msize);
419 hdr->type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_GET);
420 GNUNET_assert (slen1 + slen2 ==
421 GNUNET_STRINGS_buffer_fill ((char *) &hdr[1],
424 handle->current->subsystem,
425 handle->current->name));
426 GNUNET_CLIENT_receive (handle->client,
429 GNUNET_TIME_absolute_get_remaining (handle->
437 * Transmit a SET/UPDATE request.
440 transmit_set (struct GNUNET_STATISTICS_Handle *handle, size_t size, void *buf)
442 struct GNUNET_STATISTICS_SetMessage *r;
449 finish (handle, GNUNET_SYSERR);
453 slen = strlen (handle->current->subsystem) + 1;
454 nlen = strlen (handle->current->name) + 1;
455 nsize = sizeof (struct GNUNET_STATISTICS_SetMessage) + slen + nlen;
459 finish (handle, GNUNET_SYSERR);
463 r->header.size = htons (nsize);
464 r->header.type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_SET);
466 r->value = GNUNET_htonll (handle->current->value);
467 if (handle->current->make_persistent)
468 r->flags |= htonl (GNUNET_STATISTICS_SETFLAG_PERSISTENT);
469 if (handle->current->type == ACTION_UPDATE)
470 r->flags |= htonl (GNUNET_STATISTICS_SETFLAG_RELATIVE);
471 GNUNET_assert (slen + nlen ==
472 GNUNET_STRINGS_buffer_fill ((char *) &r[1],
475 handle->current->subsystem,
476 handle->current->name));
477 finish (handle, GNUNET_OK);
483 transmit_action (void *cls, size_t size, void *buf)
485 struct GNUNET_STATISTICS_Handle *handle = cls;
488 switch (handle->current->type)
491 ret = transmit_get (handle, size, buf);
495 ret = transmit_set (handle, size, buf);
507 * Schedule the next action to be performed.
510 schedule_action (struct GNUNET_STATISTICS_Handle *h)
512 struct GNUNET_TIME_Relative timeout;
514 if (h->current != NULL)
515 return; /* action already pending */
516 if (GNUNET_YES != try_connect (h))
518 finish (h, GNUNET_SYSERR);
522 /* schedule next action */
523 h->current = h->action_head;
524 if (NULL == h->current)
526 /* no pending network action, check destroy! */
527 if (h->do_destroy != GNUNET_YES)
532 h->action_head = h->action_head->next;
533 if (NULL == h->action_head)
534 h->action_tail = NULL;
535 h->current->next = NULL;
537 timeout = GNUNET_TIME_absolute_get_remaining (h->current->timeout);
539 GNUNET_CLIENT_notify_transmit_ready (h->client,
541 timeout, &transmit_action, h))
544 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
545 "Failed to transmit request to statistics service.\n");
547 finish (h, GNUNET_SYSERR);
553 insert_ai (struct GNUNET_STATISTICS_Handle *h, struct ActionItem *ai)
555 if (h->action_tail == NULL)
563 h->action_tail->next = ai;
570 * Get statistic from the peer.
572 * @param handle identification of the statistics service
573 * @param subsystem limit to the specified subsystem, NULL for our subsystem
574 * @param name name of the statistic value, NULL for all values
575 * @param timeout after how long should we give up (and call
576 * cont with an error code)?
577 * @param cont continuation to call when done (can be NULL)
578 * @param proc function to call on each value
579 * @param cls closure for cont and proc
582 GNUNET_STATISTICS_get (struct GNUNET_STATISTICS_Handle *handle,
583 const char *subsystem,
585 struct GNUNET_TIME_Relative timeout,
586 GNUNET_STATISTICS_Callback cont,
587 GNUNET_STATISTICS_Iterator proc, void *cls)
591 struct ActionItem *ai;
593 GNUNET_assert (handle != NULL);
594 GNUNET_assert (proc != NULL);
595 if (GNUNET_YES != try_connect (handle))
598 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
599 "Failed to connect to statistics service, can not get value `%s:%s'.\n",
600 strlen (subsystem) ? subsystem : "*",
601 strlen (name) ? name : "*");
604 cont (cls, GNUNET_SYSERR);
607 if (subsystem == NULL)
611 slen1 = strlen (subsystem);
612 slen2 = strlen (name);
613 GNUNET_assert (slen1 + slen2 + sizeof (struct GNUNET_MessageHeader) <
614 GNUNET_SERVER_MAX_MESSAGE_SIZE);
615 ai = GNUNET_malloc (sizeof (struct ActionItem));
616 ai->subsystem = GNUNET_strdup (subsystem);
617 ai->name = GNUNET_strdup (name);
621 ai->timeout = GNUNET_TIME_relative_to_absolute (timeout);
622 ai->type = ACTION_GET;
623 ai->msize = slen1 + slen2 + sizeof (struct GNUNET_MessageHeader);
624 insert_ai (handle, ai);
629 add_setter_action (struct GNUNET_STATISTICS_Handle *h,
632 unsigned long long value, enum ActionType type)
634 struct ActionItem *ai;
639 GNUNET_assert (h != NULL);
640 GNUNET_assert (name != NULL);
641 if (GNUNET_YES != try_connect (h))
643 slen = strlen (h->subsystem) + 1;
644 nlen = strlen (name) + 1;
645 nsize = sizeof (struct GNUNET_STATISTICS_SetMessage) + slen + nlen;
646 if (nsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
651 ai = GNUNET_malloc (sizeof (struct ActionItem));
652 ai->subsystem = GNUNET_strdup (h->subsystem);
653 ai->name = GNUNET_strdup (name);
654 ai->timeout = GNUNET_TIME_relative_to_absolute (SET_TRANSMIT_TIMEOUT);
655 ai->make_persistent = make_persistent;
665 * Set statistic value for the peer. Will always use our
666 * subsystem (the argument used when "handle" was created).
668 * @param handle identification of the statistics service
669 * @param name name of the statistic value
670 * @param value new value to set
671 * @param make_persistent should the value be kept across restarts?
674 GNUNET_STATISTICS_set (struct GNUNET_STATISTICS_Handle *handle,
676 unsigned long long value, int make_persistent)
678 add_setter_action (handle, name, make_persistent, value, ACTION_SET);
683 * Set statistic value for the peer. Will always use our
684 * subsystem (the argument used when "handle" was created).
686 * @param handle identification of the statistics service
687 * @param name name of the statistic value
688 * @param delta change in value (added to existing value)
689 * @param make_persistent should the value be kept across restarts?
692 GNUNET_STATISTICS_update (struct GNUNET_STATISTICS_Handle *handle,
694 long long delta, int make_persistent)
696 add_setter_action (handle, name, make_persistent,
697 (unsigned long long) delta, ACTION_UPDATE);
701 /* end of statistics_api.c */