2 * collectd - src/rrdtool.c
3 * Copyright (C) 2006 Florian octo Forster
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.
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.
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
19 * Florian octo Forster <octo at verplant.org>
25 #include "utils_avltree.h"
26 #include "utils_debug.h"
29 * This weird macro cascade forces the glibc to define `NAN'. I don't know
30 * another way to solve this, so more intelligent solutions are welcome. -octo
33 # define DISABLE__USE_ISOC99 1
34 # define __USE_ISOC99 1
37 #ifdef DISABLE__USE_ISOC99
38 # undef DISABLE__USE_ISOC99
51 typedef struct rrd_cache_s rrd_cache_t;
56 static int rra_timespans[] =
65 static int rra_timespans_num = 5;
67 static char *rra_types[] =
74 static int rra_types_num = 3;
76 static const char *config_keys[] =
83 static int config_keys_num = 3;
85 static char *datadir = NULL;
87 static int cache_timeout = 0;
88 static int cache_flush_timeout = 0;
89 static time_t cache_flush_last;
90 static avl_tree_t *cache = NULL;
95 static int rra_get (char ***ret)
97 static char **rra_def = NULL;
98 static int rra_num = 0;
100 int rra_max = rra_timespans_num * rra_types_num;
112 if ((rra_num != 0) && (rra_def != NULL))
118 if ((rra_def = (char **) malloc ((rra_max + 1) * sizeof (char *))) == NULL)
120 memset (rra_def, '\0', (rra_max + 1) * sizeof (char *));
123 /* FIXME: Use config here */
124 rows = atoi (COLLECTD_ROWS);
126 if ((step <= 0) || (rows <= 0))
133 for (i = 0; i < rra_timespans_num; i++)
135 span = rra_timespans[i];
137 if ((span / step) < rows)
143 cdp_len = (int) floor (((double) span) / ((double) (rows * step)));
145 cdp_num = (int) ceil (((double) span) / ((double) (cdp_len * step)));
147 for (j = 0; j < rra_types_num; j++)
149 if (rra_num >= rra_max)
152 if (snprintf (buffer, sizeof(buffer), "RRA:%s:%3.1f:%u:%u",
153 rra_types[j], COLLECTD_XFF,
154 cdp_len, cdp_num) >= sizeof (buffer))
156 syslog (LOG_ERR, "rra_get: Buffer would have been truncated.");
160 rra_def[rra_num++] = sstrdup (buffer);
165 DBG ("rra_num = %i", rra_num);
166 for (i = 0; i < rra_num; i++)
167 DBG (" %s", rra_def[i]);
174 static void ds_free (int ds_num, char **ds_def)
178 for (i = 0; i < ds_num; i++)
179 if (ds_def[i] != NULL)
184 static int ds_get (char ***ret, const data_set_t *ds)
193 DBG ("ds->ds_num = %i", ds->ds_num);
195 ds_def = (char **) malloc (ds->ds_num * sizeof (char *));
198 syslog (LOG_ERR, "rrdtool plugin: malloc failed: %s",
202 memset (ds_def, '\0', ds->ds_num * sizeof (char *));
204 for (ds_num = 0; ds_num < ds->ds_num; ds_num++)
206 data_source_t *d = ds->ds + ds_num;
210 ds_def[ds_num] = NULL;
212 if (d->type == DS_TYPE_COUNTER)
214 else if (d->type == DS_TYPE_GAUGE)
218 syslog (LOG_ERR, "rrdtool plugin: Unknown DS type: %i",
229 snprintf (min, sizeof (min), "%lf", d->min);
230 min[sizeof (min) - 1] = '\0';
239 snprintf (max, sizeof (max), "%lf", d->max);
240 max[sizeof (max) - 1] = '\0';
243 status = snprintf (buffer, sizeof (buffer),
245 d->name, type, COLLECTD_HEARTBEAT,
247 if ((status < 1) || (status >= sizeof (buffer)))
250 ds_def[ds_num] = sstrdup (buffer);
251 } /* for ds_num = 0 .. ds->ds_num */
256 DBG ("ds_num = %i", ds_num);
257 for (i = 0; i < ds_num; i++)
258 DBG (" %s", ds_def[i]);
262 if (ds_num != ds->ds_num)
264 ds_free (ds_num, ds_def);
272 static int rrd_create_file (char *filename, const data_set_t *ds)
284 if (check_create_dir (filename))
287 if ((rra_num = rra_get (&rra_def)) < 1)
289 syslog (LOG_ERR, "rrd_create_file failed: Could not calculate RRAs");
293 if ((ds_num = ds_get (&ds_def, ds)) < 1)
295 syslog (LOG_ERR, "rrd_create_file failed: Could not calculate DSes");
299 argc = ds_num + rra_num + 4;
301 if ((argv = (char **) malloc (sizeof (char *) * (argc + 1))) == NULL)
303 syslog (LOG_ERR, "rrd_create failed: %s", strerror (errno));
307 status = snprintf (step, sizeof (step), "%i", interval_g);
308 if ((status < 1) || (status >= sizeof (step)))
310 syslog (LOG_ERR, "rrdtool plugin: snprintf failed.");
320 for (i = 0; i < ds_num; i++)
321 argv[j++] = ds_def[i];
322 for (i = 0; i < rra_num; i++)
323 argv[j++] = rra_def[i];
326 optind = 0; /* bug in librrd? */
328 if (rrd_create (argc, argv) == -1)
330 syslog (LOG_ERR, "rrd_create failed: %s: %s", filename, rrd_get_error ());
335 ds_free (ds_num, ds_def);
340 static int value_list_to_string (char *buffer, int buffer_len,
341 const data_set_t *ds, const value_list_t *vl)
347 memset (buffer, '\0', sizeof (buffer_len));
349 status = snprintf (buffer, buffer_len, "%u", (unsigned int) vl->time);
350 if ((status < 1) || (status >= buffer_len))
354 for (i = 0; i < ds->ds_num; i++)
356 if ((ds->ds[i].type != DS_TYPE_COUNTER)
357 && (ds->ds[i].type != DS_TYPE_GAUGE))
360 if (ds->ds[i].type == DS_TYPE_COUNTER)
361 status = snprintf (buffer + offset, buffer_len - offset,
362 ":%llu", vl->values[i].counter);
364 status = snprintf (buffer + offset, buffer_len - offset,
365 ":%lf", vl->values[i].gauge);
367 if ((status < 1) || (status >= (buffer_len - offset)))
371 } /* for ds->ds_num */
374 } /* int value_list_to_string */
376 static int value_list_to_filename (char *buffer, int buffer_len,
377 const data_set_t *ds, const value_list_t *vl)
384 status = snprintf (buffer + offset, buffer_len - offset,
386 if ((status < 1) || (status >= buffer_len - offset))
391 status = snprintf (buffer + offset, buffer_len - offset,
393 if ((status < 1) || (status >= buffer_len - offset))
397 if (strlen (vl->plugin_instance) > 0)
398 status = snprintf (buffer + offset, buffer_len - offset,
399 "%s-%s/", vl->plugin, vl->plugin_instance);
401 status = snprintf (buffer + offset, buffer_len - offset,
403 if ((status < 1) || (status >= buffer_len - offset))
407 if (strlen (vl->type_instance) > 0)
408 status = snprintf (buffer + offset, buffer_len - offset,
409 "%s-%s.rrd", ds->type, vl->type_instance);
411 status = snprintf (buffer + offset, buffer_len - offset,
413 if ((status < 1) || (status >= buffer_len - offset))
418 } /* int value_list_to_filename */
420 static rrd_cache_t *rrd_cache_insert (const char *filename,
423 rrd_cache_t *rc = NULL;
427 avl_get (cache, filename, (void *) &rc);
431 rc = (rrd_cache_t *) malloc (sizeof (rrd_cache_t));
440 rc->values = (char **) realloc ((void *) rc->values,
441 (rc->values_num + 1) * sizeof (char *));
442 if (rc->values == NULL)
444 syslog (LOG_ERR, "rrdtool plugin: realloc failed: %s",
448 void *cache_key = NULL;
449 avl_remove (cache, filename, &cache_key, NULL);
456 rc->values[rc->values_num] = strdup (value);
457 if (rc->values[rc->values_num] != NULL)
460 if (rc->values_num == 1)
461 rc->first_value = time (NULL);
463 /* Insert if this is the first value */
464 if ((cache != NULL) && (new_rc == 1))
466 void *cache_key = strdup (filename);
468 if (cache_key == NULL)
470 syslog (LOG_ERR, "rrdtool plugin: strdup failed: %s",
472 sfree (rc->values[0]);
478 avl_insert (cache, cache_key, rc);
481 DBG ("rrd_cache_insert (%s, %s) = %p", filename, value, (void *) rc);
484 } /* rrd_cache_t *rrd_cache_insert */
486 static int rrd_write_cache_entry (const char *filename, rrd_cache_t *rc)
496 argc = rc->values_num + 2;
497 argv = (char **) malloc ((argc + 1) * sizeof (char *));
501 fn = strdup (filename);
510 memcpy (argv + 2, rc->values, rc->values_num * sizeof (char *));
513 DBG ("rrd_update (argc = %i, argv = %p)", argc, (void *) argv);
515 optind = 0; /* bug in librrd? */
517 status = rrd_update (argc, argv);
522 /* Free the value list of `rc' */
523 for (i = 0; i < rc->values_num; i++)
524 free (rc->values[i]);
531 syslog (LOG_WARNING, "rrd_update failed: %s: %s",
532 filename, rrd_get_error ());
537 } /* int rrd_write_cache_entry */
539 static void rrd_cache_flush (int timeout)
548 avl_iterator_t *iter;
554 DBG ("Flushing cache, timeout = %i", timeout);
558 /* Build a list of entries to be flushed */
559 iter = avl_get_iterator (cache);
560 while (avl_iterator_next (iter, (void *) &key, (void *) &rc) == 0)
562 DBG ("key = %s; age = %i;", key, now - rc->first_value);
563 if ((now - rc->first_value) >= timeout)
565 keys = (char **) realloc ((void *) keys,
566 (keys_num + 1) * sizeof (char *));
569 DBG ("realloc failed: %s", strerror (errno));
570 syslog (LOG_ERR, "rrdtool plugin: "
571 "realloc failed: %s",
573 avl_iterator_destroy (iter);
576 keys[keys_num] = key;
579 } /* while (avl_iterator_next) */
580 avl_iterator_destroy (iter);
582 for (i = 0; i < keys_num; i++)
584 if (avl_remove (cache, keys[i], (void *) &key, (void *) &rc) != 0)
586 DBG ("avl_remove (%s) failed.", keys[i]);
590 rrd_write_cache_entry (keys[i], rc);
591 /* rc's value-list is free's by `rrd_write_cache_entry' */
595 } /* for (i = 0..keys_num) */
598 DBG ("Flushed %i value(s)", keys_num);
600 cache_flush_last = now;
601 } /* void rrd_cache_flush */
603 static int rrd_write (const data_set_t *ds, const value_list_t *vl)
611 if (value_list_to_filename (filename, sizeof (filename), ds, vl) != 0)
614 if (value_list_to_string (values, sizeof (values), ds, vl) != 0)
617 if (stat (filename, &statbuf) == -1)
621 if (rrd_create_file (filename, ds))
626 syslog (LOG_ERR, "stat(%s) failed: %s",
627 filename, strerror (errno));
631 else if (!S_ISREG (statbuf.st_mode))
633 syslog (LOG_ERR, "stat(%s): Not a regular file!",
638 rc = rrd_cache_insert (filename, values);
644 rrd_write_cache_entry (filename, rc);
645 /* rc's value-list is free's by `rrd_write_cache_entry' */
652 DBG ("age (%s) = %i", filename, now - rc->first_value);
654 /* `rc' is not free'd here, because we'll likely reuse it. If not, then
655 * the next flush will remove this entry. */
656 if ((now - rc->first_value) >= cache_timeout)
657 rrd_write_cache_entry (filename, rc);
659 if ((now - cache_flush_last) >= cache_flush_timeout)
660 rrd_cache_flush (cache_flush_timeout);
663 } /* int rrd_write */
665 static int rrd_config (const char *key, const char *val)
667 if (strcasecmp ("CacheTimeout", key) == 0)
669 int tmp = atoi (val);
672 fprintf (stderr, "rrdtool: `CacheTimeout' must "
673 "be greater than 0.\n");
678 else if (strcasecmp ("CacheFlush", key) == 0)
680 int tmp = atoi (val);
683 fprintf (stderr, "rrdtool: `CacheFlush' must "
684 "be greater than 0.\n");
687 cache_flush_timeout = tmp;
689 else if (strcasecmp ("DataDir", key) == 0)
693 datadir = strdup (val);
696 int len = strlen (datadir);
697 while ((len > 0) && (datadir[len - 1] == '/'))
714 } /* int rrd_config */
716 static int rrd_shutdown (void)
718 rrd_cache_flush (-1);
724 } /* int rrd_shutdown */
726 static int rrd_init (void)
728 if (cache_timeout < 2)
731 cache_flush_timeout = 0;
735 if (cache_flush_timeout < cache_timeout)
736 cache_flush_timeout = 10 * cache_timeout;
738 cache = avl_create ((int (*) (const void *, const void *)) strcmp);
739 cache_flush_last = time (NULL);
740 plugin_register_shutdown ("rrdtool", rrd_shutdown);
745 void module_register (void)
747 plugin_register_config ("rrdtool", rrd_config,
748 config_keys, config_keys_num);
749 plugin_register_init ("rrdtool", rrd_init);
750 plugin_register_write ("rrdtool", rrd_write);