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;
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 sched scheduler to use
205 * @param subsystem name of subsystem using the service
206 * @param cfg services configuration in use
207 * @return handle to use
209 struct GNUNET_STATISTICS_Handle *
210 GNUNET_STATISTICS_create (struct GNUNET_SCHEDULER_Handle *sched,
211 const char *subsystem,
212 const struct GNUNET_CONFIGURATION_Handle *cfg)
214 struct GNUNET_STATISTICS_Handle *ret;
216 GNUNET_assert (subsystem != NULL);
217 GNUNET_assert (sched != NULL);
218 GNUNET_assert (cfg != NULL);
219 ret = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_Handle));
222 ret->subsystem = GNUNET_strdup (subsystem);
229 * Actually free the handle.
232 do_destroy (struct GNUNET_STATISTICS_Handle *h)
234 GNUNET_assert (h->action_head == NULL);
235 GNUNET_assert (h->current == NULL);
236 if (h->client != NULL)
238 GNUNET_CLIENT_disconnect (h->client);
241 GNUNET_free (h->subsystem);
247 * Destroy a handle (free all state associated with
251 GNUNET_STATISTICS_destroy (struct GNUNET_STATISTICS_Handle *handle)
253 GNUNET_assert (handle->do_destroy == GNUNET_NO);
254 if ((handle->action_head != NULL) || (handle->current != NULL))
256 handle->do_destroy = GNUNET_YES;
264 * Process the message.
266 * @return GNUNET_OK if the message was well-formed
269 process_message (struct GNUNET_STATISTICS_Handle *h,
270 const struct GNUNET_MessageHeader *msg)
274 const struct GNUNET_STATISTICS_ReplyMessage *smsg;
277 if (h->current->aborted)
278 return GNUNET_OK; /* don't bother */
279 size = ntohs (msg->size);
280 if (size < sizeof (struct GNUNET_STATISTICS_ReplyMessage))
283 return GNUNET_SYSERR;
285 smsg = (const struct GNUNET_STATISTICS_ReplyMessage *) msg;
286 size -= sizeof (struct GNUNET_STATISTICS_ReplyMessage);
287 if (size != GNUNET_STRINGS_buffer_tokenize ((const char *) &smsg[1],
288 size, 2, &service, &name))
291 return GNUNET_SYSERR;
294 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
295 "Received valid statistic on `%s:%s': %llu\n",
296 service, name, GNUNET_ntohll (smsg->value));
299 h->current->proc (h->current->cls,
302 GNUNET_ntohll (smsg->value),
304 (ntohl (smsg->uid) & GNUNET_STATISTICS_PERSIST_BIT)))
307 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
308 "Processing of remaining statistics aborted by client.\n");
310 h->current->aborted = GNUNET_YES;
318 * Schedule the next action to be performed.
320 static void schedule_action (struct GNUNET_STATISTICS_Handle *h);
324 * GET processing is complete, tell client about it.
327 finish (struct GNUNET_STATISTICS_Handle *h, int code)
329 struct ActionItem *pos = h->current;
332 if (pos->cont != NULL)
333 pos->cont (pos->cls, code);
334 free_action_item (pos);
339 * Function called with messages from stats service.
342 * @param msg message received, NULL on timeout or fatal error
345 receive_stats (void *cls, const struct GNUNET_MessageHeader *msg)
347 struct GNUNET_STATISTICS_Handle *h = cls;
351 GNUNET_CLIENT_disconnect (h->client);
354 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
355 "Error receiving statistics from service, is the service running?\n" );
357 finish (h, GNUNET_SYSERR);
360 switch (ntohs (msg->type))
362 case GNUNET_MESSAGE_TYPE_STATISTICS_END:
364 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
365 "Received end of statistics marker\n");
367 finish (h, GNUNET_OK);
369 case GNUNET_MESSAGE_TYPE_STATISTICS_VALUE:
370 if (GNUNET_OK == process_message (h, msg))
372 /* finally, look for more! */
373 GNUNET_CLIENT_receive (h->client,
376 GNUNET_TIME_absolute_get_remaining
377 (h->current->timeout));
386 GNUNET_CLIENT_disconnect (h->client);
388 finish (h, GNUNET_SYSERR);
393 * Transmit a GET request (and if successful, start to receive
397 transmit_get (struct GNUNET_STATISTICS_Handle *handle, size_t size, void *buf)
399 struct GNUNET_MessageHeader *hdr;
406 /* timeout / error */
408 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
409 "Transmission of request for statistics failed!\n");
411 finish (handle, GNUNET_SYSERR);
414 slen1 = strlen (handle->current->subsystem) + 1;
415 slen2 = strlen (handle->current->name) + 1;
416 msize = slen1 + slen2 + sizeof (struct GNUNET_MessageHeader);
417 GNUNET_assert (msize <= size);
418 hdr = (struct GNUNET_MessageHeader *) buf;
419 hdr->size = htons (msize);
420 hdr->type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_GET);
421 GNUNET_assert (slen1 + slen2 ==
422 GNUNET_STRINGS_buffer_fill ((char *) &hdr[1],
425 handle->current->subsystem,
426 handle->current->name));
427 GNUNET_CLIENT_receive (handle->client,
430 GNUNET_TIME_absolute_get_remaining (handle->
438 * Transmit a SET/UPDATE request.
441 transmit_set (struct GNUNET_STATISTICS_Handle *handle, size_t size, void *buf)
443 struct GNUNET_STATISTICS_SetMessage *r;
450 finish (handle, GNUNET_SYSERR);
454 slen = strlen (handle->current->subsystem) + 1;
455 nlen = strlen (handle->current->name) + 1;
456 nsize = sizeof (struct GNUNET_STATISTICS_SetMessage) + slen + nlen;
460 finish (handle, GNUNET_SYSERR);
464 r->header.size = htons (nsize);
465 r->header.type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_SET);
467 r->value = GNUNET_htonll (handle->current->value);
468 if (handle->current->make_persistent)
469 r->flags |= htonl (GNUNET_STATISTICS_SETFLAG_PERSISTENT);
470 if (handle->current->type == ACTION_UPDATE)
471 r->flags |= htonl (GNUNET_STATISTICS_SETFLAG_RELATIVE);
472 GNUNET_assert (slen + nlen ==
473 GNUNET_STRINGS_buffer_fill ((char *) &r[1],
476 handle->current->subsystem,
477 handle->current->name));
478 finish (handle, GNUNET_OK);
484 transmit_action (void *cls, size_t size, void *buf)
486 struct GNUNET_STATISTICS_Handle *handle = cls;
489 switch (handle->current->type)
492 ret = transmit_get (handle, size, buf);
496 ret = transmit_set (handle, size, buf);
508 * Schedule the next action to be performed.
511 schedule_action (struct GNUNET_STATISTICS_Handle *h)
513 struct GNUNET_TIME_Relative timeout;
515 if (h->current != NULL)
516 return; /* action already pending */
517 if (GNUNET_YES != try_connect (h))
519 finish (h, GNUNET_SYSERR);
523 /* schedule next action */
524 h->current = h->action_head;
525 if (NULL == h->current)
527 /* no pending network action, check destroy! */
528 if (h->do_destroy != GNUNET_YES)
533 h->action_head = h->action_head->next;
534 if (NULL == h->action_head)
535 h->action_tail = NULL;
536 h->current->next = NULL;
538 timeout = GNUNET_TIME_absolute_get_remaining (h->current->timeout);
540 GNUNET_CLIENT_notify_transmit_ready (h->client,
542 timeout, &transmit_action, h))
545 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
546 "Failed to transmit request to statistics service.\n");
548 finish (h, GNUNET_SYSERR);
554 insert_ai (struct GNUNET_STATISTICS_Handle *h, struct ActionItem *ai)
556 if (h->action_tail == NULL)
564 h->action_tail->next = ai;
571 * Get statistic from the peer.
573 * @param handle identification of the statistics service
574 * @param subsystem limit to the specified subsystem, NULL for our subsystem
575 * @param name name of the statistic value, NULL for all values
576 * @param timeout after how long should we give up (and call
577 * cont with an error code)?
578 * @param cont continuation to call when done (can be NULL)
579 * @param proc function to call on each value
580 * @param cls closure for cont and proc
583 GNUNET_STATISTICS_get (struct GNUNET_STATISTICS_Handle *handle,
584 const char *subsystem,
586 struct GNUNET_TIME_Relative timeout,
587 GNUNET_STATISTICS_Callback cont,
588 GNUNET_STATISTICS_Iterator proc, void *cls)
592 struct ActionItem *ai;
594 GNUNET_assert (handle != NULL);
595 GNUNET_assert (proc != NULL);
596 if (GNUNET_YES != try_connect (handle))
599 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
600 "Failed to connect to statistics service, can not get value `%s:%s'.\n",
601 strlen (subsystem) ? subsystem : "*",
602 strlen (name) ? name : "*");
605 cont (cls, GNUNET_SYSERR);
608 if (subsystem == NULL)
612 slen1 = strlen (subsystem);
613 slen2 = strlen (name);
614 GNUNET_assert (slen1 + slen2 + sizeof (struct GNUNET_MessageHeader) <
615 GNUNET_SERVER_MAX_MESSAGE_SIZE);
616 ai = GNUNET_malloc (sizeof (struct ActionItem));
617 ai->subsystem = GNUNET_strdup (subsystem);
618 ai->name = GNUNET_strdup (name);
622 ai->timeout = GNUNET_TIME_relative_to_absolute (timeout);
623 ai->type = ACTION_GET;
624 ai->msize = slen1 + slen2 + sizeof (struct GNUNET_MessageHeader);
625 insert_ai (handle, ai);
630 add_setter_action (struct GNUNET_STATISTICS_Handle *h,
633 uint64_t value, enum ActionType type)
635 struct ActionItem *ai;
640 GNUNET_assert (h != NULL);
641 GNUNET_assert (name != NULL);
642 if (GNUNET_YES != try_connect (h))
644 slen = strlen (h->subsystem) + 1;
645 nlen = strlen (name) + 1;
646 nsize = sizeof (struct GNUNET_STATISTICS_SetMessage) + slen + nlen;
647 if (nsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
652 ai = GNUNET_malloc (sizeof (struct ActionItem));
653 ai->subsystem = GNUNET_strdup (h->subsystem);
654 ai->name = GNUNET_strdup (name);
655 ai->timeout = GNUNET_TIME_relative_to_absolute (SET_TRANSMIT_TIMEOUT);
656 ai->make_persistent = make_persistent;
666 * Set statistic value for the peer. Will always use our
667 * subsystem (the argument used when "handle" was created).
669 * @param handle identification of the statistics service
670 * @param name name of the statistic value
671 * @param value new value to set
672 * @param make_persistent should the value be kept across restarts?
675 GNUNET_STATISTICS_set (struct GNUNET_STATISTICS_Handle *handle,
677 uint64_t value, int make_persistent)
679 add_setter_action (handle, name, make_persistent, value, ACTION_SET);
684 * Set statistic value for the peer. Will always use our
685 * subsystem (the argument used when "handle" was created).
687 * @param handle identification of the statistics service
688 * @param name name of the statistic value
689 * @param delta change in value (added to existing value)
690 * @param make_persistent should the value be kept across restarts?
693 GNUNET_STATISTICS_update (struct GNUNET_STATISTICS_Handle *handle,
695 int64_t delta, int make_persistent)
697 add_setter_action (handle, name, make_persistent,
698 (unsigned long long) delta, ACTION_UPDATE);
702 /* end of statistics_api.c */