b80e1109cfcdfed8e27623a3390e548e0ca9e7e5
1 /**
2 * collectd - src/rrdtool.c
3 * Copyright (C) 2006-2008 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 #include "collectd.h"
23 #include "plugin.h"
24 #include "common.h"
25 #include "utils_avltree.h"
26 #include "utils_rrdcreate.h"
28 #include <rrd.h>
30 #if HAVE_PTHREAD_H
31 # include <pthread.h>
32 #endif
34 /*
35 * Private types
36 */
37 struct rrd_cache_s
38 {
39 int values_num;
40 char **values;
41 time_t first_value;
42 time_t last_value;
43 enum
44 {
45 FLAG_NONE = 0x00,
46 FLAG_QUEUED = 0x01,
47 FLAG_FLUSHQ = 0x02
48 } flags;
49 };
50 typedef struct rrd_cache_s rrd_cache_t;
52 enum rrd_queue_dir_e
53 {
54 QUEUE_INSERT_FRONT,
55 QUEUE_INSERT_BACK
56 };
57 typedef enum rrd_queue_dir_e rrd_queue_dir_t;
59 struct rrd_queue_s
60 {
61 char *filename;
62 struct rrd_queue_s *next;
63 };
64 typedef struct rrd_queue_s rrd_queue_t;
66 /*
67 * Private variables
68 */
69 static const char *config_keys[] =
70 {
71 "CacheTimeout",
72 "CacheFlush",
73 "DataDir",
74 "StepSize",
75 "HeartBeat",
76 "RRARows",
77 "RRATimespan",
78 "XFF",
79 "WritesPerSecond"
80 };
81 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
83 /* If datadir is zero, the daemon's basedir is used. If stepsize or heartbeat
84 * is zero a default, depending on the `interval' member of the value list is
85 * being used. */
86 static char *datadir = NULL;
87 static double write_rate = 0.0;
88 static rrdcreate_config_t rrdcreate_config =
89 {
90 /* stepsize = */ 0,
91 /* heartbeat = */ 0,
92 /* rrarows = */ 1200,
93 /* xff = */ 0.1,
95 /* timespans = */ NULL,
96 /* timespans_num = */ 0,
98 /* consolidation_functions = */ NULL,
99 /* consolidation_functions_num = */ 0
100 };
102 /* XXX: If you need to lock both, cache_lock and queue_lock, at the same time,
103 * ALWAYS lock `cache_lock' first! */
104 static int cache_timeout = 0;
105 static int cache_flush_timeout = 0;
106 static time_t cache_flush_last;
107 static c_avl_tree_t *cache = NULL;
108 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
110 static rrd_queue_t *queue_head = NULL;
111 static rrd_queue_t *queue_tail = NULL;
112 static rrd_queue_t *flushq_head = NULL;
113 static rrd_queue_t *flushq_tail = NULL;
114 static pthread_t queue_thread = 0;
115 static pthread_mutex_t queue_lock = PTHREAD_MUTEX_INITIALIZER;
116 static pthread_cond_t queue_cond = PTHREAD_COND_INITIALIZER;
118 #if !HAVE_THREADSAFE_LIBRRD
119 static pthread_mutex_t librrd_lock = PTHREAD_MUTEX_INITIALIZER;
120 #endif
122 static int do_shutdown = 0;
124 #if HAVE_THREADSAFE_LIBRRD
125 static int srrd_update (char *filename, char *template,
126 int argc, const char **argv)
127 {
128 int status;
130 optind = 0; /* bug in librrd? */
131 rrd_clear_error ();
133 status = rrd_update_r (filename, template, argc, (void *) argv);
135 if (status != 0)
136 {
137 WARNING ("rrdtool plugin: rrd_update_r (%s) failed: %s",
138 filename, rrd_get_error ());
139 }
141 return (status);
142 } /* int srrd_update */
143 /* #endif HAVE_THREADSAFE_LIBRRD */
145 #else /* !HAVE_THREADSAFE_LIBRRD */
146 static int srrd_update (char *filename, char *template,
147 int argc, const char **argv)
148 {
149 int status;
151 int new_argc;
152 char **new_argv;
154 assert (template == NULL);
156 new_argc = 2 + argc;
157 new_argv = (char **) malloc ((new_argc + 1) * sizeof (char *));
158 if (new_argv == NULL)
159 {
160 ERROR ("rrdtool plugin: malloc failed.");
161 return (-1);
162 }
164 new_argv[0] = "update";
165 new_argv[1] = filename;
167 memcpy (new_argv + 2, argv, argc * sizeof (char *));
168 new_argv[new_argc] = NULL;
170 pthread_mutex_lock (&librrd_lock);
171 optind = 0; /* bug in librrd? */
172 rrd_clear_error ();
174 status = rrd_update (new_argc, new_argv);
175 pthread_mutex_unlock (&librrd_lock);
177 if (status != 0)
178 {
179 WARNING ("rrdtool plugin: rrd_update_r failed: %s: %s",
180 argv[1], rrd_get_error ());
181 }
183 sfree (new_argv);
185 return (status);
186 } /* int srrd_update */
187 #endif /* !HAVE_THREADSAFE_LIBRRD */
189 static int value_list_to_string (char *buffer, int buffer_len,
190 const data_set_t *ds, const value_list_t *vl)
191 {
192 int offset;
193 int status;
194 int i;
196 memset (buffer, '\0', buffer_len);
198 status = ssnprintf (buffer, buffer_len, "%u", (unsigned int) vl->time);
199 if ((status < 1) || (status >= buffer_len))
200 return (-1);
201 offset = status;
203 for (i = 0; i < ds->ds_num; i++)
204 {
205 if ((ds->ds[i].type != DS_TYPE_COUNTER)
206 && (ds->ds[i].type != DS_TYPE_GAUGE))
207 return (-1);
209 if (ds->ds[i].type == DS_TYPE_COUNTER)
210 status = ssnprintf (buffer + offset, buffer_len - offset,
211 ":%llu", vl->values[i].counter);
212 else
213 status = ssnprintf (buffer + offset, buffer_len - offset,
214 ":%lf", vl->values[i].gauge);
216 if ((status < 1) || (status >= (buffer_len - offset)))
217 return (-1);
219 offset += status;
220 } /* for ds->ds_num */
222 return (0);
223 } /* int value_list_to_string */
225 static int value_list_to_filename (char *buffer, int buffer_len,
226 const data_set_t __attribute__((unused)) *ds, const value_list_t *vl)
227 {
228 int offset = 0;
229 int status;
231 if (datadir != NULL)
232 {
233 status = ssnprintf (buffer + offset, buffer_len - offset,
234 "%s/", datadir);
235 if ((status < 1) || (status >= buffer_len - offset))
236 return (-1);
237 offset += status;
238 }
240 status = ssnprintf (buffer + offset, buffer_len - offset,
241 "%s/", vl->host);
242 if ((status < 1) || (status >= buffer_len - offset))
243 return (-1);
244 offset += status;
246 if (strlen (vl->plugin_instance) > 0)
247 status = ssnprintf (buffer + offset, buffer_len - offset,
248 "%s-%s/", vl->plugin, vl->plugin_instance);
249 else
250 status = ssnprintf (buffer + offset, buffer_len - offset,
251 "%s/", vl->plugin);
252 if ((status < 1) || (status >= buffer_len - offset))
253 return (-1);
254 offset += status;
256 if (strlen (vl->type_instance) > 0)
257 status = ssnprintf (buffer + offset, buffer_len - offset,
258 "%s-%s.rrd", vl->type, vl->type_instance);
259 else
260 status = ssnprintf (buffer + offset, buffer_len - offset,
261 "%s.rrd", vl->type);
262 if ((status < 1) || (status >= buffer_len - offset))
263 return (-1);
264 offset += status;
266 return (0);
267 } /* int value_list_to_filename */
269 static void *rrd_queue_thread (void __attribute__((unused)) *data)
270 {
271 struct timeval tv_next_update;
272 struct timeval tv_now;
274 gettimeofday (&tv_next_update, /* timezone = */ NULL);
276 while (42)
277 {
278 rrd_queue_t *queue_entry;
279 rrd_cache_t *cache_entry;
280 char **values;
281 int values_num;
282 int status;
283 int i;
285 pthread_mutex_lock (&queue_lock);
286 /* Wait for values to arrive */
287 while (true)
288 {
289 struct timespec ts_wait;
291 while ((flushq_head == NULL) && (queue_head == NULL)
292 && (do_shutdown == 0))
293 pthread_cond_wait (&queue_cond, &queue_lock);
295 if ((flushq_head == NULL) && (queue_head == NULL))
296 break;
298 /* Don't delay if there's something to flush */
299 if (flushq_head != NULL)
300 break;
302 /* Don't delay if we're shutting down */
303 if (do_shutdown != 0)
304 break;
306 /* Don't delay if no delay was configured. */
307 if (write_rate <= 0.0)
308 break;
310 gettimeofday (&tv_now, /* timezone = */ NULL);
311 status = timeval_cmp (tv_next_update, tv_now, NULL);
312 /* We're good to go */
313 if (status <= 0)
314 break;
316 /* We're supposed to wait a bit with this update, so we'll
317 * wait for the next addition to the queue or to the end of
318 * the wait period - whichever comes first. */
319 ts_wait.tv_sec = tv_next_update.tv_sec;
320 ts_wait.tv_nsec = 1000 * tv_next_update.tv_usec;
322 status = pthread_cond_timedwait (&queue_cond, &queue_lock,
323 &ts_wait);
324 if (status == ETIMEDOUT)
325 break;
326 } /* while (true) */
328 /* XXX: If you need to lock both, cache_lock and queue_lock, at
329 * the same time, ALWAYS lock `cache_lock' first! */
331 /* We're in the shutdown phase */
332 if ((flushq_head == NULL) && (queue_head == NULL))
333 {
334 pthread_mutex_unlock (&queue_lock);
335 break;
336 }
338 if (flushq_head != NULL)
339 {
340 /* Dequeue the first flush entry */
341 queue_entry = flushq_head;
342 if (flushq_head == flushq_tail)
343 flushq_head = flushq_tail = NULL;
344 else
345 flushq_head = flushq_head->next;
346 }
347 else /* if (queue_head != NULL) */
348 {
349 /* Dequeue the first regular entry */
350 queue_entry = queue_head;
351 if (queue_head == queue_tail)
352 queue_head = queue_tail = NULL;
353 else
354 queue_head = queue_head->next;
355 }
357 /* Unlock the queue again */
358 pthread_mutex_unlock (&queue_lock);
360 /* We now need the cache lock so the entry isn't updated while
361 * we make a copy of it's values */
362 pthread_mutex_lock (&cache_lock);
364 status = c_avl_get (cache, queue_entry->filename,
365 (void *) &cache_entry);
367 if (status == 0)
368 {
369 values = cache_entry->values;
370 values_num = cache_entry->values_num;
372 cache_entry->values = NULL;
373 cache_entry->values_num = 0;
374 cache_entry->flags = FLAG_NONE;
375 }
377 pthread_mutex_unlock (&cache_lock);
379 if (status != 0)
380 {
381 sfree (queue_entry->filename);
382 sfree (queue_entry);
383 continue;
384 }
386 /* Update `tv_next_update' */
387 if (write_rate > 0.0)
388 {
389 gettimeofday (&tv_now, /* timezone = */ NULL);
390 tv_next_update.tv_sec = tv_now.tv_sec;
391 tv_next_update.tv_usec = tv_now.tv_usec
392 + ((suseconds_t) (1000000 * write_rate));
393 while (tv_next_update.tv_usec > 1000000)
394 {
395 tv_next_update.tv_sec++;
396 tv_next_update.tv_usec -= 1000000;
397 }
398 }
400 /* Write the values to the RRD-file */
401 srrd_update (queue_entry->filename, NULL,
402 values_num, (const char **)values);
403 DEBUG ("rrdtool plugin: queue thread: Wrote %i values to %s",
404 values_num, queue_entry->filename);
406 for (i = 0; i < values_num; i++)
407 {
408 sfree (values[i]);
409 }
410 sfree (values);
411 sfree (queue_entry->filename);
412 sfree (queue_entry);
413 } /* while (42) */
415 pthread_mutex_lock (&cache_lock);
416 c_avl_destroy (cache);
417 cache = NULL;
418 pthread_mutex_unlock (&cache_lock);
420 pthread_exit ((void *) 0);
421 return ((void *) 0);
422 } /* void *rrd_queue_thread */
424 static int rrd_queue_enqueue (const char *filename,
425 rrd_queue_t **head, rrd_queue_t **tail)
426 {
427 rrd_queue_t *queue_entry;
429 queue_entry = (rrd_queue_t *) malloc (sizeof (rrd_queue_t));
430 if (queue_entry == NULL)
431 return (-1);
433 queue_entry->filename = strdup (filename);
434 if (queue_entry->filename == NULL)
435 {
436 free (queue_entry);
437 return (-1);
438 }
440 queue_entry->next = NULL;
442 pthread_mutex_lock (&queue_lock);
444 if (*tail == NULL)
445 *head = queue_entry;
446 else
447 (*tail)->next = queue_entry;
448 *tail = queue_entry;
450 pthread_cond_signal (&queue_cond);
451 pthread_mutex_unlock (&queue_lock);
453 return (0);
454 } /* int rrd_queue_enqueue */
456 static int rrd_queue_dequeue (const char *filename,
457 rrd_queue_t **head, rrd_queue_t **tail)
458 {
459 rrd_queue_t *this;
460 rrd_queue_t *prev;
462 pthread_mutex_lock (&queue_lock);
464 prev = NULL;
465 this = *head;
467 while (this != NULL)
468 {
469 if (strcmp (this->filename, filename) == 0)
470 break;
472 prev = this;
473 this = this->next;
474 }
476 if (this == NULL)
477 {
478 pthread_mutex_unlock (&queue_lock);
479 return (-1);
480 }
482 if (prev == NULL)
483 *head = this->next;
484 else
485 prev->next = this->next;
487 if (this->next == NULL)
488 *tail = prev;
490 pthread_mutex_unlock (&queue_lock);
492 sfree (this->filename);
493 sfree (this);
495 return (0);
496 } /* int rrd_queue_dequeue */
498 static void rrd_cache_flush (int timeout)
499 {
500 rrd_cache_t *rc;
501 time_t now;
503 char **keys = NULL;
504 int keys_num = 0;
506 char *key;
507 c_avl_iterator_t *iter;
508 int i;
510 DEBUG ("rrdtool plugin: Flushing cache, timeout = %i", timeout);
512 now = time (NULL);
514 /* Build a list of entries to be flushed */
515 iter = c_avl_get_iterator (cache);
516 while (c_avl_iterator_next (iter, (void *) &key, (void *) &rc) == 0)
517 {
518 if (rc->flags != FLAG_NONE)
519 continue;
520 else if ((now - rc->first_value) < timeout)
521 continue;
522 else if (rc->values_num > 0)
523 {
524 int status;
526 status = rrd_queue_enqueue (key, &queue_head, &queue_tail);
527 if (status == 0)
528 rc->flags = FLAG_QUEUED;
529 }
530 else /* ancient and no values -> waste of memory */
531 {
532 char **tmp = (char **) realloc ((void *) keys,
533 (keys_num + 1) * sizeof (char *));
534 if (tmp == NULL)
535 {
536 char errbuf[1024];
537 ERROR ("rrdtool plugin: "
538 "realloc failed: %s",
539 sstrerror (errno, errbuf,
540 sizeof (errbuf)));
541 c_avl_iterator_destroy (iter);
542 sfree (keys);
543 return;
544 }
545 keys = tmp;
546 keys[keys_num] = key;
547 keys_num++;
548 }
549 } /* while (c_avl_iterator_next) */
550 c_avl_iterator_destroy (iter);
552 for (i = 0; i < keys_num; i++)
553 {
554 if (c_avl_remove (cache, keys[i], (void *) &key, (void *) &rc) != 0)
555 {
556 DEBUG ("rrdtool plugin: c_avl_remove (%s) failed.", keys[i]);
557 continue;
558 }
560 assert (rc->values == NULL);
561 assert (rc->values_num == 0);
563 sfree (rc);
564 sfree (key);
565 keys[i] = NULL;
566 } /* for (i = 0..keys_num) */
568 sfree (keys);
570 cache_flush_last = now;
571 } /* void rrd_cache_flush */
573 static int rrd_cache_flush_identifier (int timeout, const char *identifier)
574 {
575 rrd_cache_t *rc;
576 time_t now;
577 int status;
578 char key[2048];
580 if (identifier == NULL)
581 {
582 rrd_cache_flush (timeout);
583 return (0);
584 }
586 now = time (NULL);
588 if (datadir == NULL)
589 snprintf (key, sizeof (key), "%s.rrd",
590 identifier);
591 else
592 snprintf (key, sizeof (key), "%s/%s.rrd",
593 datadir, identifier);
594 key[sizeof (key) - 1] = 0;
596 status = c_avl_get (cache, key, (void *) &rc);
597 if (status != 0)
598 {
599 WARNING ("rrdtool plugin: rrd_cache_flush_identifier: "
600 "c_avl_get (%s) failed. Does that file really exist?",
601 key);
602 return (status);
603 }
605 if (rc->flags == FLAG_FLUSHQ)
606 {
607 status = 0;
608 }
609 else if (rc->flags == FLAG_QUEUED)
610 {
611 rrd_queue_dequeue (key, &queue_head, &queue_tail);
612 status = rrd_queue_enqueue (key, &flushq_head, &flushq_tail);
613 if (status == 0)
614 rc->flags = FLAG_FLUSHQ;
615 }
616 else if ((now - rc->first_value) < timeout)
617 {
618 status = 0;
619 }
620 else if (rc->values_num > 0)
621 {
622 status = rrd_queue_enqueue (key, &flushq_head, &flushq_tail);
623 if (status == 0)
624 rc->flags = FLAG_FLUSHQ;
625 }
627 return (status);
628 } /* int rrd_cache_flush_identifier */
630 static int rrd_cache_insert (const char *filename,
631 const char *value, time_t value_time)
632 {
633 rrd_cache_t *rc = NULL;
634 int new_rc = 0;
635 char **values_new;
637 pthread_mutex_lock (&cache_lock);
639 /* This shouldn't happen, but it did happen at least once, so we'll be
640 * careful. */
641 if (cache == NULL)
642 {
643 pthread_mutex_unlock (&cache_lock);
644 WARNING ("rrdtool plugin: cache == NULL.");
645 return (-1);
646 }
648 c_avl_get (cache, filename, (void *) &rc);
650 if (rc == NULL)
651 {
652 rc = (rrd_cache_t *) malloc (sizeof (rrd_cache_t));
653 if (rc == NULL)
654 return (-1);
655 rc->values_num = 0;
656 rc->values = NULL;
657 rc->first_value = 0;
658 rc->last_value = 0;
659 rc->flags = FLAG_NONE;
660 new_rc = 1;
661 }
663 if (rc->last_value >= value_time)
664 {
665 pthread_mutex_unlock (&cache_lock);
666 WARNING ("rrdtool plugin: (rc->last_value = %u) >= (value_time = %u)",
667 (unsigned int) rc->last_value,
668 (unsigned int) value_time);
669 return (-1);
670 }
672 values_new = (char **) realloc ((void *) rc->values,
673 (rc->values_num + 1) * sizeof (char *));
674 if (values_new == NULL)
675 {
676 char errbuf[1024];
677 void *cache_key = NULL;
679 sstrerror (errno, errbuf, sizeof (errbuf));
681 c_avl_remove (cache, filename, &cache_key, NULL);
682 pthread_mutex_unlock (&cache_lock);
684 ERROR ("rrdtool plugin: realloc failed: %s", errbuf);
686 sfree (cache_key);
687 sfree (rc->values);
688 sfree (rc);
689 return (-1);
690 }
691 rc->values = values_new;
693 rc->values[rc->values_num] = strdup (value);
694 if (rc->values[rc->values_num] != NULL)
695 rc->values_num++;
697 if (rc->values_num == 1)
698 rc->first_value = value_time;
699 rc->last_value = value_time;
701 /* Insert if this is the first value */
702 if (new_rc == 1)
703 {
704 void *cache_key = strdup (filename);
706 if (cache_key == NULL)
707 {
708 char errbuf[1024];
709 sstrerror (errno, errbuf, sizeof (errbuf));
711 pthread_mutex_unlock (&cache_lock);
713 ERROR ("rrdtool plugin: strdup failed: %s", errbuf);
715 sfree (rc->values[0]);
716 sfree (rc->values);
717 sfree (rc);
718 return (-1);
719 }
721 c_avl_insert (cache, cache_key, rc);
722 }
724 DEBUG ("rrdtool plugin: rrd_cache_insert: file = %s; "
725 "values_num = %i; age = %lu;",
726 filename, rc->values_num,
727 (unsigned long)(rc->last_value - rc->first_value));
729 if ((rc->last_value - rc->first_value) >= cache_timeout)
730 {
731 /* XXX: If you need to lock both, cache_lock and queue_lock, at
732 * the same time, ALWAYS lock `cache_lock' first! */
733 if (rc->flags == FLAG_NONE)
734 {
735 int status;
737 status = rrd_queue_enqueue (filename, &queue_head, &queue_tail);
738 if (status == 0)
739 rc->flags = FLAG_QUEUED;
740 }
741 else
742 {
743 DEBUG ("rrdtool plugin: `%s' is already queued.", filename);
744 }
745 }
747 if ((cache_timeout > 0) &&
748 ((time (NULL) - cache_flush_last) > cache_flush_timeout))
749 rrd_cache_flush (cache_flush_timeout);
751 pthread_mutex_unlock (&cache_lock);
753 return (0);
754 } /* int rrd_cache_insert */
756 static int rrd_compare_numeric (const void *a_ptr, const void *b_ptr)
757 {
758 int a = *((int *) a_ptr);
759 int b = *((int *) b_ptr);
761 if (a < b)
762 return (-1);
763 else if (a > b)
764 return (1);
765 else
766 return (0);
767 } /* int rrd_compare_numeric */
769 static int rrd_write (const data_set_t *ds, const value_list_t *vl)
770 {
771 struct stat statbuf;
772 char filename[512];
773 char values[512];
774 int status;
776 if (0 != strcmp (ds->type, vl->type)) {
777 ERROR ("rrdtool plugin: DS type does not match value list type");
778 return -1;
779 }
781 if (value_list_to_filename (filename, sizeof (filename), ds, vl) != 0)
782 return (-1);
784 if (value_list_to_string (values, sizeof (values), ds, vl) != 0)
785 return (-1);
787 if (stat (filename, &statbuf) == -1)
788 {
789 if (errno == ENOENT)
790 {
791 status = cu_rrd_create_file (filename,
792 ds, vl, &rrdcreate_config);
793 if (status != 0)
794 return (-1);
795 }
796 else
797 {
798 char errbuf[1024];
799 ERROR ("stat(%s) failed: %s", filename,
800 sstrerror (errno, errbuf,
801 sizeof (errbuf)));
802 return (-1);
803 }
804 }
805 else if (!S_ISREG (statbuf.st_mode))
806 {
807 ERROR ("stat(%s): Not a regular file!",
808 filename);
809 return (-1);
810 }
812 status = rrd_cache_insert (filename, values, vl->time);
814 return (status);
815 } /* int rrd_write */
817 static int rrd_flush (int timeout, const char *identifier)
818 {
819 pthread_mutex_lock (&cache_lock);
821 if (cache == NULL) {
822 pthread_mutex_unlock (&cache_lock);
823 return (0);
824 }
826 rrd_cache_flush_identifier (timeout, identifier);
828 pthread_mutex_unlock (&cache_lock);
829 return (0);
830 } /* int rrd_flush */
832 static int rrd_config (const char *key, const char *value)
833 {
834 if (strcasecmp ("CacheTimeout", key) == 0)
835 {
836 int tmp = atoi (value);
837 if (tmp < 0)
838 {
839 fprintf (stderr, "rrdtool: `CacheTimeout' must "
840 "be greater than 0.\n");
841 ERROR ("rrdtool: `CacheTimeout' must "
842 "be greater than 0.\n");
843 return (1);
844 }
845 cache_timeout = tmp;
846 }
847 else if (strcasecmp ("CacheFlush", key) == 0)
848 {
849 int tmp = atoi (value);
850 if (tmp < 0)
851 {
852 fprintf (stderr, "rrdtool: `CacheFlush' must "
853 "be greater than 0.\n");
854 ERROR ("rrdtool: `CacheFlush' must "
855 "be greater than 0.\n");
856 return (1);
857 }
858 cache_flush_timeout = tmp;
859 }
860 else if (strcasecmp ("DataDir", key) == 0)
861 {
862 if (datadir != NULL)
863 free (datadir);
864 datadir = strdup (value);
865 if (datadir != NULL)
866 {
867 int len = strlen (datadir);
868 while ((len > 0) && (datadir[len - 1] == '/'))
869 {
870 len--;
871 datadir[len] = '\0';
872 }
873 if (len <= 0)
874 {
875 free (datadir);
876 datadir = NULL;
877 }
878 }
879 }
880 else if (strcasecmp ("StepSize", key) == 0)
881 {
882 int temp = atoi (value);
883 if (temp > 0)
884 rrdcreate_config.stepsize = temp;
885 }
886 else if (strcasecmp ("HeartBeat", key) == 0)
887 {
888 int temp = atoi (value);
889 if (temp > 0)
890 rrdcreate_config.heartbeat = temp;
891 }
892 else if (strcasecmp ("RRARows", key) == 0)
893 {
894 int tmp = atoi (value);
895 if (tmp <= 0)
896 {
897 fprintf (stderr, "rrdtool: `RRARows' must "
898 "be greater than 0.\n");
899 ERROR ("rrdtool: `RRARows' must "
900 "be greater than 0.\n");
901 return (1);
902 }
903 rrdcreate_config.rrarows = tmp;
904 }
905 else if (strcasecmp ("RRATimespan", key) == 0)
906 {
907 char *saveptr = NULL;
908 char *dummy;
909 char *ptr;
910 char *value_copy;
911 int *tmp_alloc;
913 value_copy = strdup (value);
914 if (value_copy == NULL)
915 return (1);
917 dummy = value_copy;
918 while ((ptr = strtok_r (dummy, ", \t", &saveptr)) != NULL)
919 {
920 dummy = NULL;
922 tmp_alloc = realloc (rrdcreate_config.timespans,
923 sizeof (int) * (rrdcreate_config.timespans_num + 1));
924 if (tmp_alloc == NULL)
925 {
926 fprintf (stderr, "rrdtool: realloc failed.\n");
927 ERROR ("rrdtool: realloc failed.\n");
928 free (value_copy);
929 return (1);
930 }
931 rrdcreate_config.timespans = tmp_alloc;
932 rrdcreate_config.timespans[rrdcreate_config.timespans_num] = atoi (ptr);
933 if (rrdcreate_config.timespans[rrdcreate_config.timespans_num] != 0)
934 rrdcreate_config.timespans_num++;
935 } /* while (strtok_r) */
937 qsort (/* base = */ rrdcreate_config.timespans,
938 /* nmemb = */ rrdcreate_config.timespans_num,
939 /* size = */ sizeof (rrdcreate_config.timespans[0]),
940 /* compar = */ rrd_compare_numeric);
942 free (value_copy);
943 }
944 else if (strcasecmp ("XFF", key) == 0)
945 {
946 double tmp = atof (value);
947 if ((tmp < 0.0) || (tmp >= 1.0))
948 {
949 fprintf (stderr, "rrdtool: `XFF' must "
950 "be in the range 0 to 1 (exclusive).");
951 ERROR ("rrdtool: `XFF' must "
952 "be in the range 0 to 1 (exclusive).");
953 return (1);
954 }
955 rrdcreate_config.xff = tmp;
956 }
957 else if (strcasecmp ("WritesPerSecond", key) == 0)
958 {
959 double wps = atof (value);
961 if (wps < 0.0)
962 {
963 fprintf (stderr, "rrdtool: `WritesPerSecond' must be "
964 "greater than or equal to zero.");
965 return (1);
966 }
967 else if (wps == 0.0)
968 {
969 write_rate = 0.0;
970 }
971 else
972 {
973 write_rate = 1.0 / wps;
974 }
975 }
976 else
977 {
978 return (-1);
979 }
980 return (0);
981 } /* int rrd_config */
983 static int rrd_shutdown (void)
984 {
985 pthread_mutex_lock (&cache_lock);
986 rrd_cache_flush (-1);
987 pthread_mutex_unlock (&cache_lock);
989 pthread_mutex_lock (&queue_lock);
990 do_shutdown = 1;
991 pthread_cond_signal (&queue_cond);
992 pthread_mutex_unlock (&queue_lock);
994 /* Wait for all the values to be written to disk before returning. */
995 if (queue_thread != 0)
996 {
997 pthread_join (queue_thread, NULL);
998 queue_thread = 0;
999 DEBUG ("rrdtool plugin: queue_thread exited.");
1000 }
1002 return (0);
1003 } /* int rrd_shutdown */
1005 static int rrd_init (void)
1006 {
1007 int status;
1009 if (rrdcreate_config.stepsize < 0)
1010 rrdcreate_config.stepsize = 0;
1011 if (rrdcreate_config.heartbeat <= 0)
1012 rrdcreate_config.heartbeat = 2 * rrdcreate_config.stepsize;
1014 if ((rrdcreate_config.heartbeat > 0)
1015 && (rrdcreate_config.heartbeat < interval_g))
1016 WARNING ("rrdtool plugin: Your `heartbeat' is "
1017 "smaller than your `interval'. This will "
1018 "likely cause problems.");
1019 else if ((rrdcreate_config.stepsize > 0)
1020 && (rrdcreate_config.stepsize < interval_g))
1021 WARNING ("rrdtool plugin: Your `stepsize' is "
1022 "smaller than your `interval'. This will "
1023 "create needlessly big RRD-files.");
1025 /* Set the cache up */
1026 pthread_mutex_lock (&cache_lock);
1028 cache = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1029 if (cache == NULL)
1030 {
1031 ERROR ("rrdtool plugin: c_avl_create failed.");
1032 return (-1);
1033 }
1035 cache_flush_last = time (NULL);
1036 if (cache_timeout < 2)
1037 {
1038 cache_timeout = 0;
1039 cache_flush_timeout = 0;
1040 }
1041 else if (cache_flush_timeout < cache_timeout)
1042 cache_flush_timeout = 10 * cache_timeout;
1044 pthread_mutex_unlock (&cache_lock);
1046 status = pthread_create (&queue_thread, NULL, rrd_queue_thread, NULL);
1047 if (status != 0)
1048 {
1049 ERROR ("rrdtool plugin: Cannot create queue-thread.");
1050 return (-1);
1051 }
1053 DEBUG ("rrdtool plugin: rrd_init: datadir = %s; stepsize = %i;"
1054 " heartbeat = %i; rrarows = %i; xff = %lf;",
1055 (datadir == NULL) ? "(null)" : datadir,
1056 rrdcreate_config.stepsize,
1057 rrdcreate_config.heartbeat,
1058 rrdcreate_config.rrarows,
1059 rrdcreate_config.xff);
1061 return (0);
1062 } /* int rrd_init */
1064 void module_register (void)
1065 {
1066 plugin_register_config ("rrdtool", rrd_config,
1067 config_keys, config_keys_num);
1068 plugin_register_init ("rrdtool", rrd_init);
1069 plugin_register_write ("rrdtool", rrd_write);
1070 plugin_register_flush ("rrdtool", rrd_flush);
1071 plugin_register_shutdown ("rrdtool", rrd_shutdown);
1072 }