1c4f5dd297b759d7bbc9c2071f3e5eb822555471
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 } flags;
48 };
49 typedef struct rrd_cache_s rrd_cache_t;
51 enum rrd_queue_dir_e
52 {
53 QUEUE_INSERT_FRONT,
54 QUEUE_INSERT_BACK
55 };
56 typedef enum rrd_queue_dir_e rrd_queue_dir_t;
58 struct rrd_queue_s
59 {
60 char *filename;
61 struct rrd_queue_s *next;
62 };
63 typedef struct rrd_queue_s rrd_queue_t;
65 /*
66 * Private variables
67 */
68 static const char *config_keys[] =
69 {
70 "CacheTimeout",
71 "CacheFlush",
72 "DataDir",
73 "StepSize",
74 "HeartBeat",
75 "RRARows",
76 "RRATimespan",
77 "XFF"
78 };
79 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
81 /* If datadir is zero, the daemon's basedir is used. If stepsize or heartbeat
82 * is zero a default, depending on the `interval' member of the value list is
83 * being used. */
84 static char *datadir = NULL;
85 static rrdcreate_config_t rrdcreate_config =
86 {
87 /* stepsize = */ 0,
88 /* heartbeat = */ 0,
89 /* rrarows = */ 1200,
90 /* xff = */ 0.1,
92 /* timespans = */ NULL,
93 /* timespans_num = */ 0,
95 /* consolidation_functions = */ NULL,
96 /* consolidation_functions_num = */ 0
97 };
99 /* XXX: If you need to lock both, cache_lock and queue_lock, at the same time,
100 * ALWAYS lock `cache_lock' first! */
101 static int cache_timeout = 0;
102 static int cache_flush_timeout = 0;
103 static time_t cache_flush_last;
104 static c_avl_tree_t *cache = NULL;
105 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
107 static rrd_queue_t *queue_head = NULL;
108 static rrd_queue_t *queue_tail = NULL;
109 static pthread_t queue_thread = 0;
110 static pthread_mutex_t queue_lock = PTHREAD_MUTEX_INITIALIZER;
111 static pthread_cond_t queue_cond = PTHREAD_COND_INITIALIZER;
113 #if !HAVE_THREADSAFE_LIBRRD
114 static pthread_mutex_t librrd_lock = PTHREAD_MUTEX_INITIALIZER;
115 #endif
117 static int do_shutdown = 0;
119 #if HAVE_THREADSAFE_LIBRRD
120 static int srrd_update (char *filename, char *template,
121 int argc, const char **argv)
122 {
123 int status;
125 optind = 0; /* bug in librrd? */
126 rrd_clear_error ();
128 status = rrd_update_r (filename, template, argc, (void *) argv);
130 if (status != 0)
131 {
132 WARNING ("rrdtool plugin: rrd_update_r (%s) failed: %s",
133 filename, rrd_get_error ());
134 }
136 return (status);
137 } /* int srrd_update */
138 /* #endif HAVE_THREADSAFE_LIBRRD */
140 #else /* !HAVE_THREADSAFE_LIBRRD */
141 static int srrd_update (char *filename, char *template,
142 int argc, const char **argv)
143 {
144 int status;
146 int new_argc;
147 char **new_argv;
149 assert (template == NULL);
151 new_argc = 2 + argc;
152 new_argv = (char **) malloc ((new_argc + 1) * sizeof (char *));
153 if (new_argv == NULL)
154 {
155 ERROR ("rrdtool plugin: malloc failed.");
156 return (-1);
157 }
159 new_argv[0] = "update";
160 new_argv[1] = filename;
162 memcpy (new_argv + 2, argv, argc * sizeof (char *));
163 new_argv[new_argc] = NULL;
165 pthread_mutex_lock (&librrd_lock);
166 optind = 0; /* bug in librrd? */
167 rrd_clear_error ();
169 status = rrd_update (new_argc, new_argv);
170 pthread_mutex_unlock (&librrd_lock);
172 if (status != 0)
173 {
174 WARNING ("rrdtool plugin: rrd_update_r failed: %s: %s",
175 argv[1], rrd_get_error ());
176 }
178 sfree (new_argv);
180 return (status);
181 } /* int srrd_update */
182 #endif /* !HAVE_THREADSAFE_LIBRRD */
184 static int value_list_to_string (char *buffer, int buffer_len,
185 const data_set_t *ds, const value_list_t *vl)
186 {
187 int offset;
188 int status;
189 int i;
191 memset (buffer, '\0', buffer_len);
193 status = ssnprintf (buffer, buffer_len, "%u", (unsigned int) vl->time);
194 if ((status < 1) || (status >= buffer_len))
195 return (-1);
196 offset = status;
198 for (i = 0; i < ds->ds_num; i++)
199 {
200 if ((ds->ds[i].type != DS_TYPE_COUNTER)
201 && (ds->ds[i].type != DS_TYPE_GAUGE))
202 return (-1);
204 if (ds->ds[i].type == DS_TYPE_COUNTER)
205 status = ssnprintf (buffer + offset, buffer_len - offset,
206 ":%llu", vl->values[i].counter);
207 else
208 status = ssnprintf (buffer + offset, buffer_len - offset,
209 ":%lf", vl->values[i].gauge);
211 if ((status < 1) || (status >= (buffer_len - offset)))
212 return (-1);
214 offset += status;
215 } /* for ds->ds_num */
217 return (0);
218 } /* int value_list_to_string */
220 static int value_list_to_filename (char *buffer, int buffer_len,
221 const data_set_t *ds, const value_list_t *vl)
222 {
223 int offset = 0;
224 int status;
226 if (datadir != NULL)
227 {
228 status = ssnprintf (buffer + offset, buffer_len - offset,
229 "%s/", datadir);
230 if ((status < 1) || (status >= buffer_len - offset))
231 return (-1);
232 offset += status;
233 }
235 status = ssnprintf (buffer + offset, buffer_len - offset,
236 "%s/", vl->host);
237 if ((status < 1) || (status >= buffer_len - offset))
238 return (-1);
239 offset += status;
241 if (strlen (vl->plugin_instance) > 0)
242 status = ssnprintf (buffer + offset, buffer_len - offset,
243 "%s-%s/", vl->plugin, vl->plugin_instance);
244 else
245 status = ssnprintf (buffer + offset, buffer_len - offset,
246 "%s/", vl->plugin);
247 if ((status < 1) || (status >= buffer_len - offset))
248 return (-1);
249 offset += status;
251 if (strlen (vl->type_instance) > 0)
252 status = ssnprintf (buffer + offset, buffer_len - offset,
253 "%s-%s.rrd", vl->type, vl->type_instance);
254 else
255 status = ssnprintf (buffer + offset, buffer_len - offset,
256 "%s.rrd", vl->type);
257 if ((status < 1) || (status >= buffer_len - offset))
258 return (-1);
259 offset += status;
261 return (0);
262 } /* int value_list_to_filename */
264 static void *rrd_queue_thread (void *data)
265 {
266 while (42)
267 {
268 rrd_queue_t *queue_entry;
269 rrd_cache_t *cache_entry;
270 char **values;
271 int values_num;
272 int i;
274 /* XXX: If you need to lock both, cache_lock and queue_lock, at
275 * the same time, ALWAYS lock `cache_lock' first! */
277 /* wait until an entry is available */
278 pthread_mutex_lock (&queue_lock);
279 while ((queue_head == NULL) && (do_shutdown == 0))
280 pthread_cond_wait (&queue_cond, &queue_lock);
282 /* We're in the shutdown phase */
283 if (queue_head == NULL)
284 {
285 pthread_mutex_unlock (&queue_lock);
286 break;
287 }
289 /* Dequeue the first entry */
290 queue_entry = queue_head;
291 if (queue_head == queue_tail)
292 queue_head = queue_tail = NULL;
293 else
294 queue_head = queue_head->next;
296 /* Unlock the queue again */
297 pthread_mutex_unlock (&queue_lock);
299 /* We now need the cache lock so the entry isn't updated while
300 * we make a copy of it's values */
301 pthread_mutex_lock (&cache_lock);
303 c_avl_get (cache, queue_entry->filename, (void *) &cache_entry);
305 values = cache_entry->values;
306 values_num = cache_entry->values_num;
308 cache_entry->values = NULL;
309 cache_entry->values_num = 0;
310 cache_entry->flags = FLAG_NONE;
312 pthread_mutex_unlock (&cache_lock);
314 /* Write the values to the RRD-file */
315 srrd_update (queue_entry->filename, NULL,
316 values_num, (const char **)values);
317 DEBUG ("rrdtool plugin: queue thread: Wrote %i values to %s",
318 values_num, queue_entry->filename);
320 for (i = 0; i < values_num; i++)
321 {
322 sfree (values[i]);
323 }
324 sfree (values);
325 sfree (queue_entry->filename);
326 sfree (queue_entry);
327 } /* while (42) */
329 pthread_mutex_lock (&cache_lock);
330 c_avl_destroy (cache);
331 cache = NULL;
332 pthread_mutex_unlock (&cache_lock);
334 pthread_exit ((void *) 0);
335 return ((void *) 0);
336 } /* void *rrd_queue_thread */
338 static int rrd_queue_cache_entry (const char *filename, rrd_queue_dir_t dir)
339 {
340 rrd_queue_t *queue_entry;
342 queue_entry = (rrd_queue_t *) malloc (sizeof (rrd_queue_t));
343 if (queue_entry == NULL)
344 return (-1);
346 queue_entry->filename = strdup (filename);
347 if (queue_entry->filename == NULL)
348 {
349 free (queue_entry);
350 return (-1);
351 }
353 queue_entry->next = NULL;
355 pthread_mutex_lock (&queue_lock);
356 if (dir == QUEUE_INSERT_FRONT)
357 {
358 queue_entry->next = queue_head;
359 queue_head = queue_entry;
360 if (queue_tail == NULL)
361 queue_tail = queue_head;
362 }
363 else /* (dir == QUEUE_INSERT_BACK) */
364 {
365 if (queue_tail == NULL)
366 queue_head = queue_entry;
367 else
368 queue_tail->next = queue_entry;
369 queue_tail = queue_entry;
370 }
371 pthread_cond_signal (&queue_cond);
372 pthread_mutex_unlock (&queue_lock);
374 DEBUG ("rrdtool plugin: Put `%s' into the update queue", filename);
376 return (0);
377 } /* int rrd_queue_cache_entry */
379 static int rrd_queue_move_to_front (const char *filename)
380 {
381 rrd_queue_t *this;
382 rrd_queue_t *prev;
384 this = NULL;
385 prev = NULL;
386 pthread_mutex_lock (&queue_lock);
387 for (this = queue_head; this != NULL; this = this->next)
388 {
389 if (strcmp (this->filename, filename) == 0)
390 break;
391 prev = this;
392 }
394 /* Check if we found the entry and if it is NOT the first entry. */
395 if ((this != NULL) && (prev != NULL))
396 {
397 prev->next = this->next;
398 this->next = queue_head;
399 queue_head = this;
400 }
401 pthread_mutex_unlock (&queue_lock);
403 return (0);
404 } /* int rrd_queue_move_to_front */
406 static void rrd_cache_flush (int timeout)
407 {
408 rrd_cache_t *rc;
409 time_t now;
411 char **keys = NULL;
412 int keys_num = 0;
414 char *key;
415 c_avl_iterator_t *iter;
416 int i;
418 DEBUG ("rrdtool plugin: Flushing cache, timeout = %i", timeout);
420 now = time (NULL);
422 /* Build a list of entries to be flushed */
423 iter = c_avl_get_iterator (cache);
424 while (c_avl_iterator_next (iter, (void *) &key, (void *) &rc) == 0)
425 {
426 if (rc->flags == FLAG_QUEUED)
427 continue;
428 else if ((now - rc->first_value) < timeout)
429 continue;
430 else if (rc->values_num > 0)
431 {
432 if (rrd_queue_cache_entry (key, QUEUE_INSERT_BACK) == 0)
433 rc->flags = FLAG_QUEUED;
434 }
435 else /* ancient and no values -> waste of memory */
436 {
437 char **tmp = (char **) realloc ((void *) keys,
438 (keys_num + 1) * sizeof (char *));
439 if (tmp == NULL)
440 {
441 char errbuf[1024];
442 ERROR ("rrdtool plugin: "
443 "realloc failed: %s",
444 sstrerror (errno, errbuf,
445 sizeof (errbuf)));
446 c_avl_iterator_destroy (iter);
447 sfree (keys);
448 return;
449 }
450 keys = tmp;
451 keys[keys_num] = key;
452 keys_num++;
453 }
454 } /* while (c_avl_iterator_next) */
455 c_avl_iterator_destroy (iter);
457 for (i = 0; i < keys_num; i++)
458 {
459 if (c_avl_remove (cache, keys[i], (void *) &key, (void *) &rc) != 0)
460 {
461 DEBUG ("rrdtool plugin: c_avl_remove (%s) failed.", keys[i]);
462 continue;
463 }
465 assert (rc->values == NULL);
466 assert (rc->values_num == 0);
468 sfree (rc);
469 sfree (key);
470 keys[i] = NULL;
471 } /* for (i = 0..keys_num) */
473 sfree (keys);
475 cache_flush_last = now;
476 } /* void rrd_cache_flush */
478 static int rrd_cache_flush_identifier (int timeout, const char *identifier)
479 {
480 rrd_cache_t *rc;
481 time_t now;
482 int status;
483 char key[2048];
485 if (identifier == NULL)
486 {
487 rrd_cache_flush (timeout);
488 return (0);
489 }
491 now = time (NULL);
493 if (datadir == NULL)
494 snprintf (key, sizeof (key), "%s.rrd",
495 identifier);
496 else
497 snprintf (key, sizeof (key), "%s/%s.rrd",
498 datadir, identifier);
499 key[sizeof (key) - 1] = 0;
501 status = c_avl_get (cache, key, (void *) &rc);
502 if (status != 0)
503 {
504 WARNING ("rrdtool plugin: rrd_cache_flush_identifier: "
505 "c_avl_get (%s) failed. Does that file really exist?",
506 key);
507 return (status);
508 }
510 if (rc->flags == FLAG_QUEUED)
511 status = rrd_queue_move_to_front (key);
512 else if ((now - rc->first_value) < timeout)
513 status = 0;
514 else if (rc->values_num > 0)
515 {
516 status = rrd_queue_cache_entry (key, QUEUE_INSERT_FRONT);
517 if (status == 0)
518 rc->flags = FLAG_QUEUED;
519 }
521 return (status);
522 } /* int rrd_cache_flush_identifier */
524 static int rrd_cache_insert (const char *filename,
525 const char *value, time_t value_time)
526 {
527 rrd_cache_t *rc = NULL;
528 int new_rc = 0;
529 char **values_new;
531 pthread_mutex_lock (&cache_lock);
533 c_avl_get (cache, filename, (void *) &rc);
535 if (rc == NULL)
536 {
537 rc = (rrd_cache_t *) malloc (sizeof (rrd_cache_t));
538 if (rc == NULL)
539 return (-1);
540 rc->values_num = 0;
541 rc->values = NULL;
542 rc->first_value = 0;
543 rc->last_value = 0;
544 rc->flags = FLAG_NONE;
545 new_rc = 1;
546 }
548 if (rc->last_value >= value_time)
549 {
550 pthread_mutex_unlock (&cache_lock);
551 WARNING ("rrdtool plugin: (rc->last_value = %u) >= (value_time = %u)",
552 (unsigned int) rc->last_value,
553 (unsigned int) value_time);
554 return (-1);
555 }
557 values_new = (char **) realloc ((void *) rc->values,
558 (rc->values_num + 1) * sizeof (char *));
559 if (values_new == NULL)
560 {
561 char errbuf[1024];
562 void *cache_key = NULL;
564 sstrerror (errno, errbuf, sizeof (errbuf));
566 c_avl_remove (cache, filename, &cache_key, NULL);
567 pthread_mutex_unlock (&cache_lock);
569 ERROR ("rrdtool plugin: realloc failed: %s", errbuf);
571 sfree (cache_key);
572 sfree (rc->values);
573 sfree (rc);
574 return (-1);
575 }
576 rc->values = values_new;
578 rc->values[rc->values_num] = strdup (value);
579 if (rc->values[rc->values_num] != NULL)
580 rc->values_num++;
582 if (rc->values_num == 1)
583 rc->first_value = value_time;
584 rc->last_value = value_time;
586 /* Insert if this is the first value */
587 if (new_rc == 1)
588 {
589 void *cache_key = strdup (filename);
591 if (cache_key == NULL)
592 {
593 char errbuf[1024];
594 sstrerror (errno, errbuf, sizeof (errbuf));
596 pthread_mutex_unlock (&cache_lock);
598 ERROR ("rrdtool plugin: strdup failed: %s", errbuf);
600 sfree (rc->values[0]);
601 sfree (rc->values);
602 sfree (rc);
603 return (-1);
604 }
606 c_avl_insert (cache, cache_key, rc);
607 }
609 DEBUG ("rrdtool plugin: rrd_cache_insert: file = %s; "
610 "values_num = %i; age = %lu;",
611 filename, rc->values_num,
612 (unsigned long)(rc->last_value - rc->first_value));
614 if ((rc->last_value - rc->first_value) >= cache_timeout)
615 {
616 /* XXX: If you need to lock both, cache_lock and queue_lock, at
617 * the same time, ALWAYS lock `cache_lock' first! */
618 if (rc->flags != FLAG_QUEUED)
619 {
620 if (rrd_queue_cache_entry (filename, QUEUE_INSERT_BACK) == 0)
621 rc->flags = FLAG_QUEUED;
622 }
623 else
624 {
625 DEBUG ("rrdtool plugin: `%s' is already queued.", filename);
626 }
627 }
629 if ((cache_timeout > 0) &&
630 ((time (NULL) - cache_flush_last) > cache_flush_timeout))
631 rrd_cache_flush (cache_flush_timeout);
634 pthread_mutex_unlock (&cache_lock);
636 return (0);
637 } /* int rrd_cache_insert */
639 static int rrd_compare_numeric (const void *a_ptr, const void *b_ptr)
640 {
641 int a = *((int *) a_ptr);
642 int b = *((int *) b_ptr);
644 if (a < b)
645 return (-1);
646 else if (a > b)
647 return (1);
648 else
649 return (0);
650 } /* int rrd_compare_numeric */
652 static int rrd_write (const data_set_t *ds, const value_list_t *vl)
653 {
654 struct stat statbuf;
655 char filename[512];
656 char values[512];
657 int status;
659 if (0 != strcmp (ds->type, vl->type)) {
660 ERROR ("rrdtool plugin: DS type does not match value list type");
661 return -1;
662 }
664 if (value_list_to_filename (filename, sizeof (filename), ds, vl) != 0)
665 return (-1);
667 if (value_list_to_string (values, sizeof (values), ds, vl) != 0)
668 return (-1);
670 if (stat (filename, &statbuf) == -1)
671 {
672 if (errno == ENOENT)
673 {
674 status = cu_rrd_create_file (filename,
675 ds, vl, &rrdcreate_config);
676 if (status != 0)
677 return (-1);
678 }
679 else
680 {
681 char errbuf[1024];
682 ERROR ("stat(%s) failed: %s", filename,
683 sstrerror (errno, errbuf,
684 sizeof (errbuf)));
685 return (-1);
686 }
687 }
688 else if (!S_ISREG (statbuf.st_mode))
689 {
690 ERROR ("stat(%s): Not a regular file!",
691 filename);
692 return (-1);
693 }
695 status = rrd_cache_insert (filename, values, vl->time);
697 return (status);
698 } /* int rrd_write */
700 static int rrd_flush (int timeout, const char *identifier)
701 {
702 pthread_mutex_lock (&cache_lock);
704 if (cache == NULL) {
705 pthread_mutex_unlock (&cache_lock);
706 return (0);
707 }
709 rrd_cache_flush_identifier (timeout, identifier);
711 pthread_mutex_unlock (&cache_lock);
712 return (0);
713 } /* int rrd_flush */
715 static int rrd_config (const char *key, const char *value)
716 {
717 if (strcasecmp ("CacheTimeout", key) == 0)
718 {
719 int tmp = atoi (value);
720 if (tmp < 0)
721 {
722 fprintf (stderr, "rrdtool: `CacheTimeout' must "
723 "be greater than 0.\n");
724 return (1);
725 }
726 cache_timeout = tmp;
727 }
728 else if (strcasecmp ("CacheFlush", key) == 0)
729 {
730 int tmp = atoi (value);
731 if (tmp < 0)
732 {
733 fprintf (stderr, "rrdtool: `CacheFlush' must "
734 "be greater than 0.\n");
735 return (1);
736 }
737 cache_flush_timeout = tmp;
738 }
739 else if (strcasecmp ("DataDir", key) == 0)
740 {
741 if (datadir != NULL)
742 free (datadir);
743 datadir = strdup (value);
744 if (datadir != NULL)
745 {
746 int len = strlen (datadir);
747 while ((len > 0) && (datadir[len - 1] == '/'))
748 {
749 len--;
750 datadir[len] = '\0';
751 }
752 if (len <= 0)
753 {
754 free (datadir);
755 datadir = NULL;
756 }
757 }
758 }
759 else if (strcasecmp ("StepSize", key) == 0)
760 {
761 int temp = atoi (value);
762 if (temp > 0)
763 rrdcreate_config.stepsize = temp;
764 }
765 else if (strcasecmp ("HeartBeat", key) == 0)
766 {
767 int temp = atoi (value);
768 if (temp > 0)
769 rrdcreate_config.heartbeat = temp;
770 }
771 else if (strcasecmp ("RRARows", key) == 0)
772 {
773 int tmp = atoi (value);
774 if (tmp <= 0)
775 {
776 fprintf (stderr, "rrdtool: `RRARows' must "
777 "be greater than 0.\n");
778 return (1);
779 }
780 rrdcreate_config.rrarows = tmp;
781 }
782 else if (strcasecmp ("RRATimespan", key) == 0)
783 {
784 char *saveptr = NULL;
785 char *dummy;
786 char *ptr;
787 char *value_copy;
788 int *tmp_alloc;
790 value_copy = strdup (value);
791 if (value_copy == NULL)
792 return (1);
794 dummy = value_copy;
795 while ((ptr = strtok_r (dummy, ", \t", &saveptr)) != NULL)
796 {
797 dummy = NULL;
799 tmp_alloc = realloc (rrdcreate_config.timespans,
800 sizeof (int) * (rrdcreate_config.timespans_num + 1));
801 if (tmp_alloc == NULL)
802 {
803 fprintf (stderr, "rrdtool: realloc failed.\n");
804 free (value_copy);
805 return (1);
806 }
807 rrdcreate_config.timespans = tmp_alloc;
808 rrdcreate_config.timespans[rrdcreate_config.timespans_num] = atoi (ptr);
809 if (rrdcreate_config.timespans[rrdcreate_config.timespans_num] != 0)
810 rrdcreate_config.timespans_num++;
811 } /* while (strtok_r) */
813 qsort (/* base = */ rrdcreate_config.timespans,
814 /* nmemb = */ rrdcreate_config.timespans_num,
815 /* size = */ sizeof (rrdcreate_config.timespans[0]),
816 /* compar = */ rrd_compare_numeric);
818 free (value_copy);
819 }
820 else if (strcasecmp ("XFF", key) == 0)
821 {
822 double tmp = atof (value);
823 if ((tmp < 0.0) || (tmp >= 1.0))
824 {
825 fprintf (stderr, "rrdtool: `XFF' must "
826 "be in the range 0 to 1 (exclusive).");
827 return (1);
828 }
829 rrdcreate_config.xff = tmp;
830 }
831 else
832 {
833 return (-1);
834 }
835 return (0);
836 } /* int rrd_config */
838 static int rrd_shutdown (void)
839 {
840 pthread_mutex_lock (&cache_lock);
841 rrd_cache_flush (-1);
842 pthread_mutex_unlock (&cache_lock);
844 pthread_mutex_lock (&queue_lock);
845 do_shutdown = 1;
846 pthread_cond_signal (&queue_cond);
847 pthread_mutex_unlock (&queue_lock);
849 /* Wait for all the values to be written to disk before returning. */
850 if (queue_thread != 0)
851 {
852 pthread_join (queue_thread, NULL);
853 queue_thread = 0;
854 DEBUG ("rrdtool plugin: queue_thread exited.");
855 }
857 return (0);
858 } /* int rrd_shutdown */
860 static int rrd_init (void)
861 {
862 int status;
864 if (rrdcreate_config.stepsize < 0)
865 rrdcreate_config.stepsize = 0;
866 if (rrdcreate_config.heartbeat <= 0)
867 rrdcreate_config.heartbeat = 2 * rrdcreate_config.stepsize;
869 if ((rrdcreate_config.heartbeat > 0)
870 && (rrdcreate_config.heartbeat < interval_g))
871 WARNING ("rrdtool plugin: Your `heartbeat' is "
872 "smaller than your `interval'. This will "
873 "likely cause problems.");
874 else if ((rrdcreate_config.stepsize > 0)
875 && (rrdcreate_config.stepsize < interval_g))
876 WARNING ("rrdtool plugin: Your `stepsize' is "
877 "smaller than your `interval'. This will "
878 "create needlessly big RRD-files.");
880 /* Set the cache up */
881 pthread_mutex_lock (&cache_lock);
883 cache = c_avl_create ((int (*) (const void *, const void *)) strcmp);
884 if (cache == NULL)
885 {
886 ERROR ("rrdtool plugin: c_avl_create failed.");
887 return (-1);
888 }
890 cache_flush_last = time (NULL);
891 if (cache_timeout < 2)
892 {
893 cache_timeout = 0;
894 cache_flush_timeout = 0;
895 }
896 else if (cache_flush_timeout < cache_timeout)
897 cache_flush_timeout = 10 * cache_timeout;
899 pthread_mutex_unlock (&cache_lock);
901 status = pthread_create (&queue_thread, NULL, rrd_queue_thread, NULL);
902 if (status != 0)
903 {
904 ERROR ("rrdtool plugin: Cannot create queue-thread.");
905 return (-1);
906 }
908 DEBUG ("rrdtool plugin: rrd_init: datadir = %s; stepsize = %i;"
909 " heartbeat = %i; rrarows = %i; xff = %lf;",
910 (datadir == NULL) ? "(null)" : datadir,
911 rrdcreate_config.stepsize,
912 rrdcreate_config.heartbeat,
913 rrdcreate_config.rrarows,
914 rrdcreate_config.xff);
916 return (0);
917 } /* int rrd_init */
919 void module_register (void)
920 {
921 plugin_register_config ("rrdtool", rrd_config,
922 config_keys, config_keys_num);
923 plugin_register_init ("rrdtool", rrd_init);
924 plugin_register_write ("rrdtool", rrd_write);
925 plugin_register_flush ("rrdtool", rrd_flush);
926 plugin_register_shutdown ("rrdtool", rrd_shutdown);
927 }