820ccdc1e71a9cab966d7b95319be0bc678f925f
1 /**
2 * collectd - src/rrdtool.c
3 * Copyright (C) 2006,2007 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"
27 #if HAVE_PTHREAD_H
28 # include <pthread.h>
29 #endif
31 /*
32 * Private types
33 */
34 struct rrd_cache_s
35 {
36 int values_num;
37 char **values;
38 time_t first_value;
39 time_t last_value;
40 };
41 typedef struct rrd_cache_s rrd_cache_t;
43 /*
44 * Private variables
45 */
46 static int rra_timespans[] =
47 {
48 3600,
49 86400,
50 604800,
51 2678400,
52 31622400
53 };
54 static int rra_timespans_num = STATIC_ARRAY_SIZE (rra_timespans);
56 static int *rra_timespans_custom = NULL;
57 static int rra_timespans_custom_num = 0;
59 static char *rra_types[] =
60 {
61 "AVERAGE",
62 "MIN",
63 "MAX"
64 };
65 static int rra_types_num = STATIC_ARRAY_SIZE (rra_types);
67 static const char *config_keys[] =
68 {
69 "CacheTimeout",
70 "CacheFlush",
71 "DataDir",
72 "StepSize",
73 "HeartBeat",
74 "RRARows",
75 "RRATimespan",
76 "XFF"
77 };
78 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
80 static char *datadir = NULL;
81 static int stepsize = 0;
82 static int heartbeat = 0;
83 static int rrarows = 1200;
84 static double xff = 0.1;
86 static int cache_timeout = 0;
87 static int cache_flush_timeout = 0;
88 static time_t cache_flush_last;
89 static avl_tree_t *cache = NULL;
90 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
92 /* * * * * * * * * *
93 * WARNING: Magic *
94 * * * * * * * * * */
95 static int rra_get (char ***ret)
96 {
97 static char **rra_def = NULL;
98 static int rra_num = 0;
100 int *rts;
101 int rts_num;
103 int rra_max;
105 int span;
107 int cdp_num;
108 int cdp_len;
109 int i, j;
111 char buffer[64];
113 if ((rra_num != 0) && (rra_def != NULL))
114 {
115 *ret = rra_def;
116 return (rra_num);
117 }
119 /* Use the configured timespans or fall back to the built-in defaults */
120 if (rra_timespans_custom_num != 0)
121 {
122 rts = rra_timespans_custom;
123 rts_num = rra_timespans_custom_num;
124 }
125 else
126 {
127 rts = rra_timespans;
128 rts_num = rra_timespans_num;
129 }
131 rra_max = rts_num * rra_types_num;
133 if ((rra_def = (char **) malloc ((rra_max + 1) * sizeof (char *))) == NULL)
134 return (-1);
135 memset (rra_def, '\0', (rra_max + 1) * sizeof (char *));
137 if ((stepsize <= 0) || (rrarows <= 0))
138 {
139 *ret = NULL;
140 return (-1);
141 }
143 cdp_len = 0;
144 for (i = 0; i < rts_num; i++)
145 {
146 span = rts[i];
148 if ((span / stepsize) < rrarows)
149 continue;
151 if (cdp_len == 0)
152 cdp_len = 1;
153 else
154 cdp_len = (int) floor (((double) span)
155 / ((double) (rrarows * stepsize)));
157 cdp_num = (int) ceil (((double) span)
158 / ((double) (cdp_len * stepsize)));
160 for (j = 0; j < rra_types_num; j++)
161 {
162 if (rra_num >= rra_max)
163 break;
165 if (snprintf (buffer, sizeof (buffer), "RRA:%s:%3.1f:%u:%u",
166 rra_types[j], xff,
167 cdp_len, cdp_num) >= sizeof (buffer))
168 {
169 ERROR ("rra_get: Buffer would have been truncated.");
170 continue;
171 }
173 rra_def[rra_num++] = sstrdup (buffer);
174 }
175 }
177 #if COLLECT_DEBUG
178 DEBUG ("rra_num = %i", rra_num);
179 for (i = 0; i < rra_num; i++)
180 DEBUG (" %s", rra_def[i]);
181 #endif
183 *ret = rra_def;
184 return (rra_num);
185 }
187 static void ds_free (int ds_num, char **ds_def)
188 {
189 int i;
191 for (i = 0; i < ds_num; i++)
192 if (ds_def[i] != NULL)
193 free (ds_def[i]);
194 free (ds_def);
195 }
197 static int ds_get (char ***ret, const data_set_t *ds)
198 {
199 char **ds_def;
200 int ds_num;
202 char min[32];
203 char max[32];
204 char buffer[128];
206 DEBUG ("ds->ds_num = %i", ds->ds_num);
208 ds_def = (char **) malloc (ds->ds_num * sizeof (char *));
209 if (ds_def == NULL)
210 {
211 char errbuf[1024];
212 ERROR ("rrdtool plugin: malloc failed: %s",
213 sstrerror (errno, errbuf, sizeof (errbuf)));
214 return (-1);
215 }
216 memset (ds_def, '\0', ds->ds_num * sizeof (char *));
218 for (ds_num = 0; ds_num < ds->ds_num; ds_num++)
219 {
220 data_source_t *d = ds->ds + ds_num;
221 char *type;
222 int status;
224 ds_def[ds_num] = NULL;
226 if (d->type == DS_TYPE_COUNTER)
227 type = "COUNTER";
228 else if (d->type == DS_TYPE_GAUGE)
229 type = "GAUGE";
230 else
231 {
232 ERROR ("rrdtool plugin: Unknown DS type: %i",
233 d->type);
234 break;
235 }
237 if (isnan (d->min))
238 {
239 strcpy (min, "U");
240 }
241 else
242 {
243 snprintf (min, sizeof (min), "%lf", d->min);
244 min[sizeof (min) - 1] = '\0';
245 }
247 if (isnan (d->max))
248 {
249 strcpy (max, "U");
250 }
251 else
252 {
253 snprintf (max, sizeof (max), "%lf", d->max);
254 max[sizeof (max) - 1] = '\0';
255 }
257 status = snprintf (buffer, sizeof (buffer),
258 "DS:%s:%s:%i:%s:%s",
259 d->name, type, heartbeat,
260 min, max);
261 if ((status < 1) || (status >= sizeof (buffer)))
262 break;
264 ds_def[ds_num] = sstrdup (buffer);
265 } /* for ds_num = 0 .. ds->ds_num */
267 #if COLLECT_DEBUG
268 {
269 int i;
270 DEBUG ("ds_num = %i", ds_num);
271 for (i = 0; i < ds_num; i++)
272 DEBUG (" %s", ds_def[i]);
273 }
274 #endif
276 if (ds_num != ds->ds_num)
277 {
278 ds_free (ds_num, ds_def);
279 return (-1);
280 }
282 *ret = ds_def;
283 return (ds_num);
284 }
286 static int rrd_create_file (char *filename, const data_set_t *ds, const value_list_t *vl)
287 {
288 char **argv;
289 int argc;
290 char **rra_def;
291 int rra_num;
292 char **ds_def;
293 int ds_num;
294 int i, j;
295 char stepsize_str[16];
296 char begin_str[16];
297 int status = 0;
299 if (check_create_dir (filename))
300 return (-1);
302 if ((rra_num = rra_get (&rra_def)) < 1)
303 {
304 ERROR ("rrd_create_file failed: Could not calculate RRAs");
305 return (-1);
306 }
308 if ((ds_num = ds_get (&ds_def, ds)) < 1)
309 {
310 ERROR ("rrd_create_file failed: Could not calculate DSes");
311 return (-1);
312 }
314 argc = ds_num + rra_num + 6;
316 if ((argv = (char **) malloc (sizeof (char *) * (argc + 1))) == NULL)
317 {
318 char errbuf[1024];
319 ERROR ("rrd_create failed: %s",
320 sstrerror (errno, errbuf, sizeof (errbuf)));
321 return (-1);
322 }
324 status = snprintf (stepsize_str, sizeof (stepsize_str),
325 "%i", stepsize);
326 if ((status < 1) || (status >= sizeof (stepsize_str)))
327 {
328 ERROR ("rrdtool plugin: snprintf failed.");
329 return (-1);
330 }
332 assert (vl->time > 10);
333 status = snprintf (begin_str, sizeof (begin_str),
334 "%llu", (unsigned long long) (vl->time - 10));
335 if ((status < 1) || (status >= sizeof (begin_str)))
336 {
337 ERROR ("rrdtool plugin: snprintf failed.");
338 return (-1);
339 }
341 argv[0] = "create";
342 argv[1] = filename;
343 argv[2] = "-b";
344 argv[3] = begin_str;
345 argv[4] = "-s";
346 argv[5] = stepsize_str;
348 j = 6;
349 for (i = 0; i < ds_num; i++)
350 argv[j++] = ds_def[i];
351 for (i = 0; i < rra_num; i++)
352 argv[j++] = rra_def[i];
353 argv[j] = NULL;
355 optind = 0; /* bug in librrd? */
356 rrd_clear_error ();
357 if (rrd_create (argc, argv) == -1)
358 {
359 ERROR ("rrd_create failed: %s: %s", filename, rrd_get_error ());
360 status = -1;
361 }
363 free (argv);
364 ds_free (ds_num, ds_def);
366 return (status);
367 }
369 static int value_list_to_string (char *buffer, int buffer_len,
370 const data_set_t *ds, const value_list_t *vl)
371 {
372 int offset;
373 int status;
374 int i;
376 memset (buffer, '\0', buffer_len);
378 status = snprintf (buffer, buffer_len, "%u", (unsigned int) vl->time);
379 if ((status < 1) || (status >= buffer_len))
380 return (-1);
381 offset = status;
383 for (i = 0; i < ds->ds_num; i++)
384 {
385 if ((ds->ds[i].type != DS_TYPE_COUNTER)
386 && (ds->ds[i].type != DS_TYPE_GAUGE))
387 return (-1);
389 if (ds->ds[i].type == DS_TYPE_COUNTER)
390 status = snprintf (buffer + offset, buffer_len - offset,
391 ":%llu", vl->values[i].counter);
392 else
393 status = snprintf (buffer + offset, buffer_len - offset,
394 ":%lf", vl->values[i].gauge);
396 if ((status < 1) || (status >= (buffer_len - offset)))
397 return (-1);
399 offset += status;
400 } /* for ds->ds_num */
402 return (0);
403 } /* int value_list_to_string */
405 static int value_list_to_filename (char *buffer, int buffer_len,
406 const data_set_t *ds, const value_list_t *vl)
407 {
408 int offset = 0;
409 int status;
411 if (datadir != NULL)
412 {
413 status = snprintf (buffer + offset, buffer_len - offset,
414 "%s/", datadir);
415 if ((status < 1) || (status >= buffer_len - offset))
416 return (-1);
417 offset += status;
418 }
420 status = snprintf (buffer + offset, buffer_len - offset,
421 "%s/", vl->host);
422 if ((status < 1) || (status >= buffer_len - offset))
423 return (-1);
424 offset += status;
426 if (strlen (vl->plugin_instance) > 0)
427 status = snprintf (buffer + offset, buffer_len - offset,
428 "%s-%s/", vl->plugin, vl->plugin_instance);
429 else
430 status = snprintf (buffer + offset, buffer_len - offset,
431 "%s/", vl->plugin);
432 if ((status < 1) || (status >= buffer_len - offset))
433 return (-1);
434 offset += status;
436 if (strlen (vl->type_instance) > 0)
437 status = snprintf (buffer + offset, buffer_len - offset,
438 "%s-%s.rrd", ds->type, vl->type_instance);
439 else
440 status = snprintf (buffer + offset, buffer_len - offset,
441 "%s.rrd", ds->type);
442 if ((status < 1) || (status >= buffer_len - offset))
443 return (-1);
444 offset += status;
446 return (0);
447 } /* int value_list_to_filename */
449 static rrd_cache_t *rrd_cache_insert (const char *filename,
450 const char *value, time_t value_time)
451 {
452 rrd_cache_t *rc = NULL;
453 int new_rc = 0;
455 if (cache != NULL)
456 avl_get (cache, filename, (void *) &rc);
458 if (rc == NULL)
459 {
460 rc = (rrd_cache_t *) malloc (sizeof (rrd_cache_t));
461 if (rc == NULL)
462 return (NULL);
463 rc->values_num = 0;
464 rc->values = NULL;
465 rc->first_value = 0;
466 rc->last_value = 0;
467 new_rc = 1;
468 }
470 if (rc->last_value >= value_time)
471 {
472 WARNING ("rrdtool plugin: (rc->last_value = %u) >= (value_time = %u)",
473 (unsigned int) rc->last_value,
474 (unsigned int) value_time);
475 return (NULL);
476 }
478 rc->values = (char **) realloc ((void *) rc->values,
479 (rc->values_num + 1) * sizeof (char *));
480 if (rc->values == NULL)
481 {
482 char errbuf[1024];
483 ERROR ("rrdtool plugin: realloc failed: %s",
484 sstrerror (errno, errbuf, sizeof (errbuf)));
485 if (cache != NULL)
486 {
487 void *cache_key = NULL;
488 avl_remove (cache, filename, &cache_key, NULL);
489 sfree (cache_key);
490 }
491 free (rc);
492 return (NULL);
493 }
495 rc->values[rc->values_num] = strdup (value);
496 if (rc->values[rc->values_num] != NULL)
497 rc->values_num++;
499 if (rc->values_num == 1)
500 rc->first_value = value_time;
501 rc->last_value = value_time;
503 /* Insert if this is the first value */
504 if ((cache != NULL) && (new_rc == 1))
505 {
506 void *cache_key = strdup (filename);
508 if (cache_key == NULL)
509 {
510 char errbuf[1024];
511 ERROR ("rrdtool plugin: strdup failed: %s",
512 sstrerror (errno, errbuf, sizeof (errbuf)));
513 sfree (rc->values[0]);
514 sfree (rc->values);
515 sfree (rc);
516 return (NULL);
517 }
519 avl_insert (cache, cache_key, rc);
520 }
522 DEBUG ("rrd_cache_insert (%s, %s, %u) = %p", filename, value,
523 (unsigned int) value_time, (void *) rc);
525 return (rc);
526 } /* rrd_cache_t *rrd_cache_insert */
528 static int rrd_write_cache_entry (const char *filename, rrd_cache_t *rc)
529 {
530 char **argv;
531 int argc;
533 char *fn;
534 int status;
536 int i;
538 if (rc->values_num < 1)
539 return (0);
541 argc = rc->values_num + 2;
542 argv = (char **) malloc ((argc + 1) * sizeof (char *));
543 if (argv == NULL)
544 return (-1);
546 fn = strdup (filename);
547 if (fn == NULL)
548 {
549 free (argv);
550 return (-1);
551 }
553 argv[0] = "update";
554 argv[1] = fn;
555 memcpy (argv + 2, rc->values, rc->values_num * sizeof (char *));
556 argv[argc] = NULL;
558 DEBUG ("rrd_update (argc = %i, argv = %p)", argc, (void *) argv);
560 optind = 0; /* bug in librrd? */
561 rrd_clear_error ();
562 status = rrd_update (argc, argv);
563 if (status != 0)
564 {
565 WARNING ("rrd_update failed: %s: %s",
566 filename, rrd_get_error ());
567 status = -1;
568 }
570 free (argv);
571 free (fn);
572 /* Free the value list of `rc' */
573 for (i = 0; i < rc->values_num; i++)
574 free (rc->values[i]);
575 free (rc->values);
576 rc->values = NULL;
577 rc->values_num = 0;
579 return (status);
580 } /* int rrd_write_cache_entry */
582 static void rrd_cache_flush (int timeout)
583 {
584 rrd_cache_t *rc;
585 time_t now;
587 char **keys = NULL;
588 int keys_num = 0;
590 char *key;
591 avl_iterator_t *iter;
592 int i;
594 if (cache == NULL)
595 return;
597 DEBUG ("Flushing cache, timeout = %i", timeout);
599 now = time (NULL);
601 /* Build a list of entries to be flushed */
602 iter = avl_get_iterator (cache);
603 while (avl_iterator_next (iter, (void *) &key, (void *) &rc) == 0)
604 {
605 DEBUG ("key = %s; age = %i;", key, now - rc->first_value);
606 if ((now - rc->first_value) >= timeout)
607 {
608 keys = (char **) realloc ((void *) keys,
609 (keys_num + 1) * sizeof (char *));
610 if (keys == NULL)
611 {
612 char errbuf[1024];
613 ERROR ("rrdtool plugin: "
614 "realloc failed: %s",
615 sstrerror (errno, errbuf,
616 sizeof (errbuf)));
617 avl_iterator_destroy (iter);
618 return;
619 }
620 keys[keys_num] = key;
621 keys_num++;
622 }
623 } /* while (avl_iterator_next) */
624 avl_iterator_destroy (iter);
626 for (i = 0; i < keys_num; i++)
627 {
628 if (avl_remove (cache, keys[i], (void *) &key, (void *) &rc) != 0)
629 {
630 DEBUG ("avl_remove (%s) failed.", keys[i]);
631 continue;
632 }
634 rrd_write_cache_entry (keys[i], rc);
635 /* rc's value-list is free's by `rrd_write_cache_entry' */
636 sfree (rc);
637 sfree (key);
638 keys[i] = NULL;
639 } /* for (i = 0..keys_num) */
641 free (keys);
642 DEBUG ("Flushed %i value(s)", keys_num);
644 cache_flush_last = now;
645 } /* void rrd_cache_flush */
647 static int rrd_write (const data_set_t *ds, const value_list_t *vl)
648 {
649 struct stat statbuf;
650 char filename[512];
651 char values[512];
652 rrd_cache_t *rc;
653 time_t now;
655 if (value_list_to_filename (filename, sizeof (filename), ds, vl) != 0)
656 return (-1);
658 if (value_list_to_string (values, sizeof (values), ds, vl) != 0)
659 return (-1);
661 if (stat (filename, &statbuf) == -1)
662 {
663 if (errno == ENOENT)
664 {
665 if (rrd_create_file (filename, ds, vl))
666 return (-1);
667 }
668 else
669 {
670 char errbuf[1024];
671 ERROR ("stat(%s) failed: %s", filename,
672 sstrerror (errno, errbuf,
673 sizeof (errbuf)));
674 return (-1);
675 }
676 }
677 else if (!S_ISREG (statbuf.st_mode))
678 {
679 ERROR ("stat(%s): Not a regular file!",
680 filename);
681 return (-1);
682 }
684 pthread_mutex_lock (&cache_lock);
685 rc = rrd_cache_insert (filename, values, vl->time);
686 if (rc == NULL)
687 {
688 pthread_mutex_unlock (&cache_lock);
689 return (-1);
690 }
692 if (cache == NULL)
693 {
694 rrd_write_cache_entry (filename, rc);
695 /* rc's value-list is free's by `rrd_write_cache_entry' */
696 sfree (rc);
697 pthread_mutex_unlock (&cache_lock);
698 return (0);
699 }
701 now = time (NULL);
703 DEBUG ("age (%s) = %i", filename, now - rc->first_value);
705 /* `rc' is not free'd here, because we'll likely reuse it. If not, then
706 * the next flush will remove this entry. */
707 if ((now - rc->first_value) >= cache_timeout)
708 rrd_write_cache_entry (filename, rc);
710 if ((now - cache_flush_last) >= cache_flush_timeout)
711 rrd_cache_flush (cache_flush_timeout);
713 pthread_mutex_unlock (&cache_lock);
714 return (0);
715 } /* int rrd_write */
717 static int rrd_config (const char *key, const char *value)
718 {
719 if (strcasecmp ("CacheTimeout", key) == 0)
720 {
721 int tmp = atoi (value);
722 if (tmp < 0)
723 {
724 fprintf (stderr, "rrdtool: `CacheTimeout' must "
725 "be greater than 0.\n");
726 return (1);
727 }
728 cache_timeout = tmp;
729 }
730 else if (strcasecmp ("CacheFlush", key) == 0)
731 {
732 int tmp = atoi (value);
733 if (tmp < 0)
734 {
735 fprintf (stderr, "rrdtool: `CacheFlush' must "
736 "be greater than 0.\n");
737 return (1);
738 }
739 cache_flush_timeout = tmp;
740 }
741 else if (strcasecmp ("DataDir", key) == 0)
742 {
743 if (datadir != NULL)
744 free (datadir);
745 datadir = strdup (value);
746 if (datadir != NULL)
747 {
748 int len = strlen (datadir);
749 while ((len > 0) && (datadir[len - 1] == '/'))
750 {
751 len--;
752 datadir[len] = '\0';
753 }
754 if (len <= 0)
755 {
756 free (datadir);
757 datadir = NULL;
758 }
759 }
760 }
761 else if (strcasecmp ("StepSize", key) == 0)
762 {
763 int tmp = atoi (value);
764 if (tmp <= 0)
765 {
766 fprintf (stderr, "rrdtool: `StepSize' must "
767 "be greater than 0.\n");
768 return (1);
769 }
770 stepsize = tmp;
771 }
772 else if (strcasecmp ("HeartBeat", key) == 0)
773 {
774 int tmp = atoi (value);
775 if (tmp <= 0)
776 {
777 fprintf (stderr, "rrdtool: `HeartBeat' must "
778 "be greater than 0.\n");
779 return (1);
780 }
781 heartbeat = tmp;
782 }
783 else if (strcasecmp ("RRARows", key) == 0)
784 {
785 int tmp = atoi (value);
786 if (tmp <= 0)
787 {
788 fprintf (stderr, "rrdtool: `RRARows' must "
789 "be greater than 0.\n");
790 return (1);
791 }
792 rrarows = tmp;
793 }
794 else if (strcasecmp ("RRATimespan", key) == 0)
795 {
796 char *saveptr = NULL;
797 char *dummy;
798 char *ptr;
799 char *value_copy;
800 int *tmp_alloc;
802 value_copy = strdup (value);
803 if (value_copy == NULL)
804 return (1);
806 dummy = value_copy;
807 while ((ptr = strtok_r (dummy, ", \t", &saveptr)) != NULL)
808 {
809 dummy = NULL;
811 tmp_alloc = realloc (rra_timespans_custom,
812 sizeof (int) * (rra_timespans_custom_num + 1));
813 if (tmp_alloc == NULL)
814 {
815 fprintf (stderr, "rrdtool: realloc failed.\n");
816 free (value_copy);
817 return (1);
818 }
819 rra_timespans_custom = tmp_alloc;
820 rra_timespans_custom[rra_timespans_custom_num] = atoi (ptr);
821 if (rra_timespans_custom[rra_timespans_custom_num] != 0)
822 rra_timespans_custom_num++;
823 } /* while (strtok_r) */
824 free (value_copy);
825 }
826 else if (strcasecmp ("XFF", key) == 0)
827 {
828 double tmp = atof (value);
829 if ((tmp < 0.0) || (tmp >= 1.0))
830 {
831 fprintf (stderr, "rrdtool: `XFF' must "
832 "be in the range 0 to 1 (exclusive).");
833 return (1);
834 }
835 xff = tmp;
836 }
837 else
838 {
839 return (-1);
840 }
841 return (0);
842 } /* int rrd_config */
844 static int rrd_shutdown (void)
845 {
846 pthread_mutex_lock (&cache_lock);
847 rrd_cache_flush (-1);
848 if (cache != NULL)
849 avl_destroy (cache);
850 cache = NULL;
851 pthread_mutex_unlock (&cache_lock);
853 return (0);
854 } /* int rrd_shutdown */
856 static int rrd_init (void)
857 {
858 if (stepsize <= 0)
859 stepsize = interval_g;
860 if (heartbeat <= 0)
861 heartbeat = 2 * interval_g;
863 if (heartbeat < interval_g)
864 WARNING ("rrdtool plugin: Your `heartbeat' is "
865 "smaller than your `interval'. This will "
866 "likely cause problems.");
867 else if (stepsize < interval_g)
868 WARNING ("rrdtool plugin: Your `stepsize' is "
869 "smaller than your `interval'. This will "
870 "create needlessly big RRD-files.");
872 pthread_mutex_lock (&cache_lock);
873 if (cache_timeout < 2)
874 {
875 cache_timeout = 0;
876 cache_flush_timeout = 0;
877 }
878 else
879 {
880 if (cache_flush_timeout < cache_timeout)
881 cache_flush_timeout = 10 * cache_timeout;
883 cache = avl_create ((int (*) (const void *, const void *)) strcmp);
884 cache_flush_last = time (NULL);
885 plugin_register_shutdown ("rrdtool", rrd_shutdown);
886 }
887 pthread_mutex_unlock (&cache_lock);
889 DEBUG ("rrdtool plugin: rrd_init: datadir = %s; stepsize = %i;"
890 " heartbeat = %i; rrarows = %i; xff = %lf;",
891 (datadir == NULL) ? "(null)" : datadir,
892 stepsize, heartbeat, rrarows, xff);
894 return (0);
895 } /* int rrd_init */
897 void module_register (void)
898 {
899 plugin_register_config ("rrdtool", rrd_config,
900 config_keys, config_keys_num);
901 plugin_register_init ("rrdtool", rrd_init);
902 plugin_register_write ("rrdtool", rrd_write);
903 }