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;
115 static int queue_thread_running = 1;
116 static pthread_mutex_t queue_lock = PTHREAD_MUTEX_INITIALIZER;
117 static pthread_cond_t queue_cond = PTHREAD_COND_INITIALIZER;
119 #if !HAVE_THREADSAFE_LIBRRD
120 static pthread_mutex_t librrd_lock = PTHREAD_MUTEX_INITIALIZER;
121 #endif
123 static int do_shutdown = 0;
125 #if HAVE_THREADSAFE_LIBRRD
126 static int srrd_update (char *filename, char *template,
127 int argc, const char **argv)
128 {
129 int status;
131 optind = 0; /* bug in librrd? */
132 rrd_clear_error ();
134 status = rrd_update_r (filename, template, argc, (void *) argv);
136 if (status != 0)
137 {
138 WARNING ("rrdtool plugin: rrd_update_r (%s) failed: %s",
139 filename, rrd_get_error ());
140 }
142 return (status);
143 } /* int srrd_update */
144 /* #endif HAVE_THREADSAFE_LIBRRD */
146 #else /* !HAVE_THREADSAFE_LIBRRD */
147 static int srrd_update (char *filename, char *template,
148 int argc, const char **argv)
149 {
150 int status;
152 int new_argc;
153 char **new_argv;
155 assert (template == NULL);
157 new_argc = 2 + argc;
158 new_argv = (char **) malloc ((new_argc + 1) * sizeof (char *));
159 if (new_argv == NULL)
160 {
161 ERROR ("rrdtool plugin: malloc failed.");
162 return (-1);
163 }
165 new_argv[0] = "update";
166 new_argv[1] = filename;
168 memcpy (new_argv + 2, argv, argc * sizeof (char *));
169 new_argv[new_argc] = NULL;
171 pthread_mutex_lock (&librrd_lock);
172 optind = 0; /* bug in librrd? */
173 rrd_clear_error ();
175 status = rrd_update (new_argc, new_argv);
176 pthread_mutex_unlock (&librrd_lock);
178 if (status != 0)
179 {
180 WARNING ("rrdtool plugin: rrd_update_r failed: %s: %s",
181 argv[1], rrd_get_error ());
182 }
184 sfree (new_argv);
186 return (status);
187 } /* int srrd_update */
188 #endif /* !HAVE_THREADSAFE_LIBRRD */
190 static int value_list_to_string (char *buffer, int buffer_len,
191 const data_set_t *ds, const value_list_t *vl)
192 {
193 int offset;
194 int status;
195 int i;
197 memset (buffer, '\0', buffer_len);
199 status = ssnprintf (buffer, buffer_len, "%u", (unsigned int) vl->time);
200 if ((status < 1) || (status >= buffer_len))
201 return (-1);
202 offset = status;
204 for (i = 0; i < ds->ds_num; i++)
205 {
206 if ((ds->ds[i].type != DS_TYPE_COUNTER)
207 && (ds->ds[i].type != DS_TYPE_GAUGE))
208 return (-1);
210 if (ds->ds[i].type == DS_TYPE_COUNTER)
211 status = ssnprintf (buffer + offset, buffer_len - offset,
212 ":%llu", vl->values[i].counter);
213 else
214 status = ssnprintf (buffer + offset, buffer_len - offset,
215 ":%lf", vl->values[i].gauge);
217 if ((status < 1) || (status >= (buffer_len - offset)))
218 return (-1);
220 offset += status;
221 } /* for ds->ds_num */
223 return (0);
224 } /* int value_list_to_string */
226 static int value_list_to_filename (char *buffer, int buffer_len,
227 const data_set_t __attribute__((unused)) *ds, const value_list_t *vl)
228 {
229 int offset = 0;
230 int status;
232 if (datadir != NULL)
233 {
234 status = ssnprintf (buffer + offset, buffer_len - offset,
235 "%s/", datadir);
236 if ((status < 1) || (status >= buffer_len - offset))
237 return (-1);
238 offset += status;
239 }
241 status = ssnprintf (buffer + offset, buffer_len - offset,
242 "%s/", vl->host);
243 if ((status < 1) || (status >= buffer_len - offset))
244 return (-1);
245 offset += status;
247 if (strlen (vl->plugin_instance) > 0)
248 status = ssnprintf (buffer + offset, buffer_len - offset,
249 "%s-%s/", vl->plugin, vl->plugin_instance);
250 else
251 status = ssnprintf (buffer + offset, buffer_len - offset,
252 "%s/", vl->plugin);
253 if ((status < 1) || (status >= buffer_len - offset))
254 return (-1);
255 offset += status;
257 if (strlen (vl->type_instance) > 0)
258 status = ssnprintf (buffer + offset, buffer_len - offset,
259 "%s-%s.rrd", vl->type, vl->type_instance);
260 else
261 status = ssnprintf (buffer + offset, buffer_len - offset,
262 "%s.rrd", vl->type);
263 if ((status < 1) || (status >= buffer_len - offset))
264 return (-1);
265 offset += status;
267 return (0);
268 } /* int value_list_to_filename */
270 static void *rrd_queue_thread (void __attribute__((unused)) *data)
271 {
272 struct timeval tv_next_update;
273 struct timeval tv_now;
275 gettimeofday (&tv_next_update, /* timezone = */ NULL);
277 while (42)
278 {
279 rrd_queue_t *queue_entry;
280 rrd_cache_t *cache_entry;
281 char **values;
282 int values_num;
283 int i;
285 pthread_mutex_lock (&queue_lock);
286 /* Wait for values to arrive */
287 while (true)
288 {
289 struct timespec ts_wait;
290 int status;
292 while ((flushq_head == NULL) && (queue_head == NULL)
293 && (do_shutdown == 0))
294 pthread_cond_wait (&queue_cond, &queue_lock);
296 if ((flushq_head == NULL) && (queue_head == NULL))
297 break;
299 /* Don't delay if there's something to flush */
300 if (flushq_head != NULL)
301 break;
303 /* Don't delay if we're shutting down */
304 if (do_shutdown != 0)
305 break;
307 /* Don't delay if no delay was configured. */
308 if (write_rate <= 0.0)
309 break;
311 gettimeofday (&tv_now, /* timezone = */ NULL);
312 status = timeval_cmp (tv_next_update, tv_now, NULL);
313 /* We're good to go */
314 if (status <= 0)
315 break;
317 /* We're supposed to wait a bit with this update, so we'll
318 * wait for the next addition to the queue or to the end of
319 * the wait period - whichever comes first. */
320 ts_wait.tv_sec = tv_next_update.tv_sec;
321 ts_wait.tv_nsec = 1000 * tv_next_update.tv_usec;
323 status = pthread_cond_timedwait (&queue_cond, &queue_lock,
324 &ts_wait);
325 if (status == ETIMEDOUT)
326 break;
327 } /* while (true) */
329 /* XXX: If you need to lock both, cache_lock and queue_lock, at
330 * the same time, ALWAYS lock `cache_lock' first! */
332 /* We're in the shutdown phase */
333 if ((flushq_head == NULL) && (queue_head == NULL))
334 {
335 pthread_mutex_unlock (&queue_lock);
336 break;
337 }
339 if (flushq_head != NULL)
340 {
341 /* Dequeue the first flush entry */
342 queue_entry = flushq_head;
343 if (flushq_head == flushq_tail)
344 flushq_head = flushq_tail = NULL;
345 else
346 flushq_head = flushq_head->next;
347 }
348 else /* if (queue_head != NULL) */
349 {
350 /* Dequeue the first regular entry */
351 queue_entry = queue_head;
352 if (queue_head == queue_tail)
353 queue_head = queue_tail = NULL;
354 else
355 queue_head = queue_head->next;
356 }
358 /* Unlock the queue again */
359 pthread_mutex_unlock (&queue_lock);
361 /* We now need the cache lock so the entry isn't updated while
362 * we make a copy of it's values */
363 pthread_mutex_lock (&cache_lock);
365 c_avl_get (cache, queue_entry->filename, (void *) &cache_entry);
367 values = cache_entry->values;
368 values_num = cache_entry->values_num;
370 cache_entry->values = NULL;
371 cache_entry->values_num = 0;
372 cache_entry->flags = FLAG_NONE;
374 pthread_mutex_unlock (&cache_lock);
376 /* Update `tv_next_update' */
377 if (write_rate > 0.0)
378 {
379 gettimeofday (&tv_now, /* timezone = */ NULL);
380 tv_next_update.tv_sec = tv_now.tv_sec;
381 tv_next_update.tv_usec = tv_now.tv_usec
382 + ((suseconds_t) (1000000 * write_rate));
383 while (tv_next_update.tv_usec > 1000000)
384 {
385 tv_next_update.tv_sec++;
386 tv_next_update.tv_usec -= 1000000;
387 }
388 }
390 /* Write the values to the RRD-file */
391 srrd_update (queue_entry->filename, NULL,
392 values_num, (const char **)values);
393 DEBUG ("rrdtool plugin: queue thread: Wrote %i values to %s",
394 values_num, queue_entry->filename);
396 for (i = 0; i < values_num; i++)
397 {
398 sfree (values[i]);
399 }
400 sfree (values);
401 sfree (queue_entry->filename);
402 sfree (queue_entry);
403 } /* while (42) */
405 pthread_mutex_lock (&cache_lock);
406 c_avl_destroy (cache);
407 cache = NULL;
408 pthread_mutex_unlock (&cache_lock);
410 pthread_exit ((void *) 0);
411 return ((void *) 0);
412 } /* void *rrd_queue_thread */
414 static int rrd_queue_enqueue (const char *filename,
415 rrd_queue_t **head, rrd_queue_t **tail)
416 {
417 rrd_queue_t *queue_entry;
419 queue_entry = (rrd_queue_t *) malloc (sizeof (rrd_queue_t));
420 if (queue_entry == NULL)
421 return (-1);
423 queue_entry->filename = strdup (filename);
424 if (queue_entry->filename == NULL)
425 {
426 free (queue_entry);
427 return (-1);
428 }
430 queue_entry->next = NULL;
432 pthread_mutex_lock (&queue_lock);
434 if (*tail == NULL)
435 *head = queue_entry;
436 else
437 (*tail)->next = queue_entry;
438 *tail = queue_entry;
440 pthread_cond_signal (&queue_cond);
441 pthread_mutex_unlock (&queue_lock);
443 return (0);
444 } /* int rrd_queue_enqueue */
446 static int rrd_queue_dequeue (const char *filename,
447 rrd_queue_t **head, rrd_queue_t **tail)
448 {
449 rrd_queue_t *this;
450 rrd_queue_t *prev;
452 pthread_mutex_lock (&queue_lock);
454 prev = NULL;
455 this = *head;
457 while (this != NULL)
458 {
459 if (strcmp (this->filename, filename) == 0)
460 break;
462 prev = this;
463 this = this->next;
464 }
466 if (this == NULL)
467 {
468 pthread_mutex_unlock (&queue_lock);
469 return (-1);
470 }
472 if (prev == NULL)
473 *head = this->next;
474 else
475 prev->next = this->next;
477 if (this->next == NULL)
478 *tail = prev;
480 pthread_mutex_unlock (&queue_lock);
482 sfree (this->filename);
483 sfree (this);
485 return (0);
486 } /* int rrd_queue_dequeue */
488 static void rrd_cache_flush (int timeout)
489 {
490 rrd_cache_t *rc;
491 time_t now;
493 char **keys = NULL;
494 int keys_num = 0;
496 char *key;
497 c_avl_iterator_t *iter;
498 int i;
500 DEBUG ("rrdtool plugin: Flushing cache, timeout = %i", timeout);
502 now = time (NULL);
504 /* Build a list of entries to be flushed */
505 iter = c_avl_get_iterator (cache);
506 while (c_avl_iterator_next (iter, (void *) &key, (void *) &rc) == 0)
507 {
508 if (rc->flags != FLAG_NONE)
509 continue;
510 else if ((now - rc->first_value) < timeout)
511 continue;
512 else if (rc->values_num > 0)
513 {
514 int status;
516 status = rrd_queue_enqueue (key, &queue_head, &queue_tail);
517 if (status == 0)
518 rc->flags = FLAG_QUEUED;
519 }
520 else /* ancient and no values -> waste of memory */
521 {
522 char **tmp = (char **) realloc ((void *) keys,
523 (keys_num + 1) * sizeof (char *));
524 if (tmp == NULL)
525 {
526 char errbuf[1024];
527 ERROR ("rrdtool plugin: "
528 "realloc failed: %s",
529 sstrerror (errno, errbuf,
530 sizeof (errbuf)));
531 c_avl_iterator_destroy (iter);
532 sfree (keys);
533 return;
534 }
535 keys = tmp;
536 keys[keys_num] = key;
537 keys_num++;
538 }
539 } /* while (c_avl_iterator_next) */
540 c_avl_iterator_destroy (iter);
542 for (i = 0; i < keys_num; i++)
543 {
544 if (c_avl_remove (cache, keys[i], (void *) &key, (void *) &rc) != 0)
545 {
546 DEBUG ("rrdtool plugin: c_avl_remove (%s) failed.", keys[i]);
547 continue;
548 }
550 assert (rc->values == NULL);
551 assert (rc->values_num == 0);
553 sfree (rc);
554 sfree (key);
555 keys[i] = NULL;
556 } /* for (i = 0..keys_num) */
558 sfree (keys);
560 cache_flush_last = now;
561 } /* void rrd_cache_flush */
563 static int rrd_cache_flush_identifier (int timeout, const char *identifier)
564 {
565 rrd_cache_t *rc;
566 time_t now;
567 int status;
568 char key[2048];
570 if (identifier == NULL)
571 {
572 rrd_cache_flush (timeout);
573 return (0);
574 }
576 now = time (NULL);
578 if (datadir == NULL)
579 snprintf (key, sizeof (key), "%s.rrd",
580 identifier);
581 else
582 snprintf (key, sizeof (key), "%s/%s.rrd",
583 datadir, identifier);
584 key[sizeof (key) - 1] = 0;
586 status = c_avl_get (cache, key, (void *) &rc);
587 if (status != 0)
588 {
589 WARNING ("rrdtool plugin: rrd_cache_flush_identifier: "
590 "c_avl_get (%s) failed. Does that file really exist?",
591 key);
592 return (status);
593 }
595 if (rc->flags == FLAG_FLUSHQ)
596 {
597 status = 0;
598 }
599 else if (rc->flags == FLAG_QUEUED)
600 {
601 rrd_queue_dequeue (key, &queue_head, &queue_tail);
602 status = rrd_queue_enqueue (key, &flushq_head, &flushq_tail);
603 if (status == 0)
604 rc->flags = FLAG_FLUSHQ;
605 }
606 else if ((now - rc->first_value) < timeout)
607 {
608 status = 0;
609 }
610 else if (rc->values_num > 0)
611 {
612 status = rrd_queue_enqueue (key, &flushq_head, &flushq_tail);
613 if (status == 0)
614 rc->flags = FLAG_FLUSHQ;
615 }
617 return (status);
618 } /* int rrd_cache_flush_identifier */
620 static int rrd_cache_insert (const char *filename,
621 const char *value, time_t value_time)
622 {
623 rrd_cache_t *rc = NULL;
624 int new_rc = 0;
625 char **values_new;
627 pthread_mutex_lock (&cache_lock);
629 c_avl_get (cache, filename, (void *) &rc);
631 if (rc == NULL)
632 {
633 rc = (rrd_cache_t *) malloc (sizeof (rrd_cache_t));
634 if (rc == NULL)
635 return (-1);
636 rc->values_num = 0;
637 rc->values = NULL;
638 rc->first_value = 0;
639 rc->last_value = 0;
640 rc->flags = FLAG_NONE;
641 new_rc = 1;
642 }
644 if (rc->last_value >= value_time)
645 {
646 pthread_mutex_unlock (&cache_lock);
647 WARNING ("rrdtool plugin: (rc->last_value = %u) >= (value_time = %u)",
648 (unsigned int) rc->last_value,
649 (unsigned int) value_time);
650 return (-1);
651 }
653 values_new = (char **) realloc ((void *) rc->values,
654 (rc->values_num + 1) * sizeof (char *));
655 if (values_new == NULL)
656 {
657 char errbuf[1024];
658 void *cache_key = NULL;
660 sstrerror (errno, errbuf, sizeof (errbuf));
662 c_avl_remove (cache, filename, &cache_key, NULL);
663 pthread_mutex_unlock (&cache_lock);
665 ERROR ("rrdtool plugin: realloc failed: %s", errbuf);
667 sfree (cache_key);
668 sfree (rc->values);
669 sfree (rc);
670 return (-1);
671 }
672 rc->values = values_new;
674 rc->values[rc->values_num] = strdup (value);
675 if (rc->values[rc->values_num] != NULL)
676 rc->values_num++;
678 if (rc->values_num == 1)
679 rc->first_value = value_time;
680 rc->last_value = value_time;
682 /* Insert if this is the first value */
683 if (new_rc == 1)
684 {
685 void *cache_key = strdup (filename);
687 if (cache_key == NULL)
688 {
689 char errbuf[1024];
690 sstrerror (errno, errbuf, sizeof (errbuf));
692 pthread_mutex_unlock (&cache_lock);
694 ERROR ("rrdtool plugin: strdup failed: %s", errbuf);
696 sfree (rc->values[0]);
697 sfree (rc->values);
698 sfree (rc);
699 return (-1);
700 }
702 c_avl_insert (cache, cache_key, rc);
703 }
705 DEBUG ("rrdtool plugin: rrd_cache_insert: file = %s; "
706 "values_num = %i; age = %lu;",
707 filename, rc->values_num,
708 (unsigned long)(rc->last_value - rc->first_value));
710 if ((rc->last_value - rc->first_value) >= cache_timeout)
711 {
712 /* XXX: If you need to lock both, cache_lock and queue_lock, at
713 * the same time, ALWAYS lock `cache_lock' first! */
714 if (rc->flags == FLAG_NONE)
715 {
716 int status;
718 status = rrd_queue_enqueue (filename, &queue_head, &queue_tail);
719 if (status == 0)
720 rc->flags = FLAG_QUEUED;
721 }
722 else
723 {
724 DEBUG ("rrdtool plugin: `%s' is already queued.", filename);
725 }
726 }
728 if ((cache_timeout > 0) &&
729 ((time (NULL) - cache_flush_last) > cache_flush_timeout))
730 rrd_cache_flush (cache_flush_timeout);
732 pthread_mutex_unlock (&cache_lock);
734 return (0);
735 } /* int rrd_cache_insert */
737 static int rrd_compare_numeric (const void *a_ptr, const void *b_ptr)
738 {
739 int a = *((int *) a_ptr);
740 int b = *((int *) b_ptr);
742 if (a < b)
743 return (-1);
744 else if (a > b)
745 return (1);
746 else
747 return (0);
748 } /* int rrd_compare_numeric */
750 static int rrd_write (const data_set_t *ds, const value_list_t *vl,
751 user_data_t __attribute__((unused)) *user_data)
752 {
753 struct stat statbuf;
754 char filename[512];
755 char values[512];
756 int status;
758 if (0 != strcmp (ds->type, vl->type)) {
759 ERROR ("rrdtool plugin: DS type does not match value list type");
760 return -1;
761 }
763 if (value_list_to_filename (filename, sizeof (filename), ds, vl) != 0)
764 return (-1);
766 if (value_list_to_string (values, sizeof (values), ds, vl) != 0)
767 return (-1);
769 if (stat (filename, &statbuf) == -1)
770 {
771 if (errno == ENOENT)
772 {
773 status = cu_rrd_create_file (filename,
774 ds, vl, &rrdcreate_config);
775 if (status != 0)
776 return (-1);
777 }
778 else
779 {
780 char errbuf[1024];
781 ERROR ("stat(%s) failed: %s", filename,
782 sstrerror (errno, errbuf,
783 sizeof (errbuf)));
784 return (-1);
785 }
786 }
787 else if (!S_ISREG (statbuf.st_mode))
788 {
789 ERROR ("stat(%s): Not a regular file!",
790 filename);
791 return (-1);
792 }
794 status = rrd_cache_insert (filename, values, vl->time);
796 return (status);
797 } /* int rrd_write */
799 static int rrd_flush (int timeout, const char *identifier,
800 user_data_t __attribute__((unused)) *user_data)
801 {
802 pthread_mutex_lock (&cache_lock);
804 if (cache == NULL) {
805 pthread_mutex_unlock (&cache_lock);
806 return (0);
807 }
809 rrd_cache_flush_identifier (timeout, identifier);
811 pthread_mutex_unlock (&cache_lock);
812 return (0);
813 } /* int rrd_flush */
815 static int rrd_config (const char *key, const char *value)
816 {
817 if (strcasecmp ("CacheTimeout", key) == 0)
818 {
819 int tmp = atoi (value);
820 if (tmp < 0)
821 {
822 fprintf (stderr, "rrdtool: `CacheTimeout' must "
823 "be greater than 0.\n");
824 ERROR ("rrdtool: `CacheTimeout' must "
825 "be greater than 0.\n");
826 return (1);
827 }
828 cache_timeout = tmp;
829 }
830 else if (strcasecmp ("CacheFlush", key) == 0)
831 {
832 int tmp = atoi (value);
833 if (tmp < 0)
834 {
835 fprintf (stderr, "rrdtool: `CacheFlush' must "
836 "be greater than 0.\n");
837 ERROR ("rrdtool: `CacheFlush' must "
838 "be greater than 0.\n");
839 return (1);
840 }
841 cache_flush_timeout = tmp;
842 }
843 else if (strcasecmp ("DataDir", key) == 0)
844 {
845 if (datadir != NULL)
846 free (datadir);
847 datadir = strdup (value);
848 if (datadir != NULL)
849 {
850 int len = strlen (datadir);
851 while ((len > 0) && (datadir[len - 1] == '/'))
852 {
853 len--;
854 datadir[len] = '\0';
855 }
856 if (len <= 0)
857 {
858 free (datadir);
859 datadir = NULL;
860 }
861 }
862 }
863 else if (strcasecmp ("StepSize", key) == 0)
864 {
865 int temp = atoi (value);
866 if (temp > 0)
867 rrdcreate_config.stepsize = temp;
868 }
869 else if (strcasecmp ("HeartBeat", key) == 0)
870 {
871 int temp = atoi (value);
872 if (temp > 0)
873 rrdcreate_config.heartbeat = temp;
874 }
875 else if (strcasecmp ("RRARows", key) == 0)
876 {
877 int tmp = atoi (value);
878 if (tmp <= 0)
879 {
880 fprintf (stderr, "rrdtool: `RRARows' must "
881 "be greater than 0.\n");
882 ERROR ("rrdtool: `RRARows' must "
883 "be greater than 0.\n");
884 return (1);
885 }
886 rrdcreate_config.rrarows = tmp;
887 }
888 else if (strcasecmp ("RRATimespan", key) == 0)
889 {
890 char *saveptr = NULL;
891 char *dummy;
892 char *ptr;
893 char *value_copy;
894 int *tmp_alloc;
896 value_copy = strdup (value);
897 if (value_copy == NULL)
898 return (1);
900 dummy = value_copy;
901 while ((ptr = strtok_r (dummy, ", \t", &saveptr)) != NULL)
902 {
903 dummy = NULL;
905 tmp_alloc = realloc (rrdcreate_config.timespans,
906 sizeof (int) * (rrdcreate_config.timespans_num + 1));
907 if (tmp_alloc == NULL)
908 {
909 fprintf (stderr, "rrdtool: realloc failed.\n");
910 ERROR ("rrdtool: realloc failed.\n");
911 free (value_copy);
912 return (1);
913 }
914 rrdcreate_config.timespans = tmp_alloc;
915 rrdcreate_config.timespans[rrdcreate_config.timespans_num] = atoi (ptr);
916 if (rrdcreate_config.timespans[rrdcreate_config.timespans_num] != 0)
917 rrdcreate_config.timespans_num++;
918 } /* while (strtok_r) */
920 qsort (/* base = */ rrdcreate_config.timespans,
921 /* nmemb = */ rrdcreate_config.timespans_num,
922 /* size = */ sizeof (rrdcreate_config.timespans[0]),
923 /* compar = */ rrd_compare_numeric);
925 free (value_copy);
926 }
927 else if (strcasecmp ("XFF", key) == 0)
928 {
929 double tmp = atof (value);
930 if ((tmp < 0.0) || (tmp >= 1.0))
931 {
932 fprintf (stderr, "rrdtool: `XFF' must "
933 "be in the range 0 to 1 (exclusive).");
934 ERROR ("rrdtool: `XFF' must "
935 "be in the range 0 to 1 (exclusive).");
936 return (1);
937 }
938 rrdcreate_config.xff = tmp;
939 }
940 else if (strcasecmp ("WritesPerSecond", key) == 0)
941 {
942 double wps = atof (value);
944 if (wps < 0.0)
945 {
946 fprintf (stderr, "rrdtool: `WritesPerSecond' must be "
947 "greater than or equal to zero.");
948 return (1);
949 }
950 else if (wps == 0.0)
951 {
952 write_rate = 0.0;
953 }
954 else
955 {
956 write_rate = 1.0 / wps;
957 }
958 }
959 else
960 {
961 return (-1);
962 }
963 return (0);
964 } /* int rrd_config */
966 static int rrd_shutdown (void)
967 {
968 pthread_mutex_lock (&cache_lock);
969 rrd_cache_flush (-1);
970 pthread_mutex_unlock (&cache_lock);
972 pthread_mutex_lock (&queue_lock);
973 do_shutdown = 1;
974 pthread_cond_signal (&queue_cond);
975 pthread_mutex_unlock (&queue_lock);
977 if ((queue_thread_running != 0)
978 && ((queue_head != NULL) || (flushq_head != NULL)))
979 {
980 INFO ("rrdtool plugin: Shutting down the queue thread. "
981 "This may take a while.");
982 }
983 else if (queue_thread_running != 0)
984 {
985 INFO ("rrdtool plugin: Shutting down the queue thread.");
986 }
988 /* Wait for all the values to be written to disk before returning. */
989 if (queue_thread_running != 0)
990 {
991 pthread_join (queue_thread, NULL);
992 memset (&queue_thread, 0, sizeof (queue_thread));
993 queue_thread_running = 0;
994 DEBUG ("rrdtool plugin: queue_thread exited.");
995 }
997 /* TODO: Maybe it'd be a good idea to free the cache here.. */
999 return (0);
1000 } /* int rrd_shutdown */
1002 static int rrd_init (void)
1003 {
1004 int status;
1006 if (rrdcreate_config.stepsize < 0)
1007 rrdcreate_config.stepsize = 0;
1008 if (rrdcreate_config.heartbeat <= 0)
1009 rrdcreate_config.heartbeat = 2 * rrdcreate_config.stepsize;
1011 if ((rrdcreate_config.heartbeat > 0)
1012 && (rrdcreate_config.heartbeat < interval_g))
1013 WARNING ("rrdtool plugin: Your `heartbeat' is "
1014 "smaller than your `interval'. This will "
1015 "likely cause problems.");
1016 else if ((rrdcreate_config.stepsize > 0)
1017 && (rrdcreate_config.stepsize < interval_g))
1018 WARNING ("rrdtool plugin: Your `stepsize' is "
1019 "smaller than your `interval'. This will "
1020 "create needlessly big RRD-files.");
1022 /* Set the cache up */
1023 pthread_mutex_lock (&cache_lock);
1025 cache = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1026 if (cache == NULL)
1027 {
1028 ERROR ("rrdtool plugin: c_avl_create failed.");
1029 return (-1);
1030 }
1032 cache_flush_last = time (NULL);
1033 if (cache_timeout < 2)
1034 {
1035 cache_timeout = 0;
1036 cache_flush_timeout = 0;
1037 }
1038 else if (cache_flush_timeout < cache_timeout)
1039 cache_flush_timeout = 10 * cache_timeout;
1041 pthread_mutex_unlock (&cache_lock);
1043 status = pthread_create (&queue_thread, /* attr = */ NULL,
1044 rrd_queue_thread, /* args = */ NULL);
1045 if (status != 0)
1046 {
1047 ERROR ("rrdtool plugin: Cannot create queue-thread.");
1048 return (-1);
1049 }
1050 queue_thread_running = 1;
1052 DEBUG ("rrdtool plugin: rrd_init: datadir = %s; stepsize = %i;"
1053 " heartbeat = %i; rrarows = %i; xff = %lf;",
1054 (datadir == NULL) ? "(null)" : datadir,
1055 rrdcreate_config.stepsize,
1056 rrdcreate_config.heartbeat,
1057 rrdcreate_config.rrarows,
1058 rrdcreate_config.xff);
1060 return (0);
1061 } /* int rrd_init */
1063 void module_register (void)
1064 {
1065 plugin_register_config ("rrdtool", rrd_config,
1066 config_keys, config_keys_num);
1067 plugin_register_init ("rrdtool", rrd_init);
1068 plugin_register_write ("rrdtool", rrd_write, /* user_data = */ NULL);
1069 plugin_register_flush ("rrdtool", rrd_flush, /* user_data = */ NULL);
1070 plugin_register_shutdown ("rrdtool", rrd_shutdown);
1071 }