1 /**
2 * collectd - src/statsd.c
3 * Copyright (C) 2013 Florian octo Forster
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Florian octo Forster <octo at collectd.org>
25 */
27 #include "collectd.h"
28 #include "plugin.h"
29 #include "common.h"
30 #include "configfile.h"
31 #include "utils_avltree.h"
32 #include "utils_complain.h"
33 #include "utils_latency.h"
35 #include <pthread.h>
37 #include <sys/types.h>
38 #include <netdb.h>
39 #include <poll.h>
41 /* AIX doesn't have MSG_DONTWAIT */
42 #ifndef MSG_DONTWAIT
43 # define MSG_DONTWAIT MSG_NONBLOCK
44 #endif
46 #ifndef STATSD_DEFAULT_NODE
47 # define STATSD_DEFAULT_NODE NULL
48 #endif
50 #ifndef STATSD_DEFAULT_SERVICE
51 # define STATSD_DEFAULT_SERVICE "8125"
52 #endif
54 enum metric_type_e
55 {
56 STATSD_COUNTER,
57 STATSD_TIMER,
58 STATSD_GAUGE,
59 STATSD_SET
60 };
61 typedef enum metric_type_e metric_type_t;
63 struct statsd_metric_s
64 {
65 metric_type_t type;
66 double value;
67 derive_t counter;
68 latency_counter_t *latency;
69 c_avl_tree_t *set;
70 unsigned long updates_num;
71 };
72 typedef struct statsd_metric_s statsd_metric_t;
74 static c_avl_tree_t *metrics_tree = NULL;
75 static pthread_mutex_t metrics_lock = PTHREAD_MUTEX_INITIALIZER;
77 static pthread_t network_thread;
78 static _Bool network_thread_running = 0;
79 static _Bool network_thread_shutdown = 0;
81 static char *conf_node = NULL;
82 static char *conf_service = NULL;
84 static _Bool conf_delete_counters = 0;
85 static _Bool conf_delete_timers = 0;
86 static _Bool conf_delete_gauges = 0;
87 static _Bool conf_delete_sets = 0;
89 static double *conf_timer_percentile = NULL;
90 static size_t conf_timer_percentile_num = 0;
92 static _Bool conf_counter_sum = 0;
93 static _Bool conf_timer_lower = 0;
94 static _Bool conf_timer_upper = 0;
95 static _Bool conf_timer_sum = 0;
96 static _Bool conf_timer_count = 0;
98 /* Must hold metrics_lock when calling this function. */
99 static statsd_metric_t *statsd_metric_lookup_unsafe (char const *name, /* {{{ */
100 metric_type_t type)
101 {
102 char key[DATA_MAX_NAME_LEN + 2];
103 char *key_copy;
104 statsd_metric_t *metric;
105 int status;
107 switch (type)
108 {
109 case STATSD_COUNTER: key[0] = 'c'; break;
110 case STATSD_TIMER: key[0] = 't'; break;
111 case STATSD_GAUGE: key[0] = 'g'; break;
112 case STATSD_SET: key[0] = 's'; break;
113 default: return (NULL);
114 }
116 key[1] = ':';
117 sstrncpy (&key[2], name, sizeof (key) - 2);
119 status = c_avl_get (metrics_tree, key, (void *) &metric);
120 if (status == 0)
121 return (metric);
123 key_copy = strdup (key);
124 if (key_copy == NULL)
125 {
126 ERROR ("statsd plugin: strdup failed.");
127 return (NULL);
128 }
130 metric = malloc (sizeof (*metric));
131 if (metric == NULL)
132 {
133 ERROR ("statsd plugin: malloc failed.");
134 sfree (key_copy);
135 return (NULL);
136 }
137 memset (metric, 0, sizeof (*metric));
139 metric->type = type;
140 metric->latency = NULL;
141 metric->set = NULL;
143 status = c_avl_insert (metrics_tree, key_copy, metric);
144 if (status != 0)
145 {
146 ERROR ("statsd plugin: c_avl_insert failed.");
147 sfree (key_copy);
148 sfree (metric);
149 return (NULL);
150 }
152 return (metric);
153 } /* }}} statsd_metric_lookup_unsafe */
155 static int statsd_metric_set (char const *name, double value, /* {{{ */
156 metric_type_t type)
157 {
158 statsd_metric_t *metric;
160 pthread_mutex_lock (&metrics_lock);
162 metric = statsd_metric_lookup_unsafe (name, type);
163 if (metric == NULL)
164 {
165 pthread_mutex_unlock (&metrics_lock);
166 return (-1);
167 }
169 metric->value = value;
170 metric->updates_num++;
172 pthread_mutex_unlock (&metrics_lock);
174 return (0);
175 } /* }}} int statsd_metric_set */
177 static int statsd_metric_add (char const *name, double delta, /* {{{ */
178 metric_type_t type)
179 {
180 statsd_metric_t *metric;
182 pthread_mutex_lock (&metrics_lock);
184 metric = statsd_metric_lookup_unsafe (name, type);
185 if (metric == NULL)
186 {
187 pthread_mutex_unlock (&metrics_lock);
188 return (-1);
189 }
191 metric->value += delta;
192 metric->updates_num++;
194 pthread_mutex_unlock (&metrics_lock);
196 return (0);
197 } /* }}} int statsd_metric_add */
199 static void statsd_metric_free (statsd_metric_t *metric) /* {{{ */
200 {
201 if (metric == NULL)
202 return;
204 if (metric->latency != NULL)
205 {
206 latency_counter_destroy (metric->latency);
207 metric->latency = NULL;
208 }
210 if (metric->set != NULL)
211 {
212 void *key;
213 void *value;
215 while (c_avl_pick (metric->set, &key, &value) == 0)
216 {
217 sfree (key);
218 assert (value == NULL);
219 }
221 c_avl_destroy (metric->set);
222 metric->set = NULL;
223 }
225 sfree (metric);
226 } /* }}} void statsd_metric_free */
228 static int statsd_parse_value (char const *str, value_t *ret_value) /* {{{ */
229 {
230 char *endptr = NULL;
232 ret_value->gauge = (gauge_t) strtod (str, &endptr);
233 if ((str == endptr) || ((endptr != NULL) && (*endptr != 0)))
234 return (-1);
236 return (0);
237 } /* }}} int statsd_parse_value */
239 static int statsd_handle_counter (char const *name, /* {{{ */
240 char const *value_str,
241 char const *extra)
242 {
243 value_t value;
244 value_t scale;
245 int status;
247 if ((extra != NULL) && (extra[0] != '@'))
248 return (-1);
250 scale.gauge = 1.0;
251 if (extra != NULL)
252 {
253 status = statsd_parse_value (extra + 1, &scale);
254 if (status != 0)
255 return (status);
257 if (!isfinite (scale.gauge) || (scale.gauge <= 0.0) || (scale.gauge > 1.0))
258 return (-1);
259 }
261 value.gauge = 1.0;
262 status = statsd_parse_value (value_str, &value);
263 if (status != 0)
264 return (status);
266 /* Changes to the counter are added to (statsd_metric_t*)->value. ->counter is
267 * only updated in statsd_metric_submit_unsafe(). */
268 return (statsd_metric_add (name, (double) (value.gauge / scale.gauge),
269 STATSD_COUNTER));
270 } /* }}} int statsd_handle_counter */
272 static int statsd_handle_gauge (char const *name, /* {{{ */
273 char const *value_str)
274 {
275 value_t value;
276 int status;
278 value.gauge = 0;
279 status = statsd_parse_value (value_str, &value);
280 if (status != 0)
281 return (status);
283 if ((value_str[0] == '+') || (value_str[0] == '-'))
284 return (statsd_metric_add (name, (double) value.gauge, STATSD_GAUGE));
285 else
286 return (statsd_metric_set (name, (double) value.gauge, STATSD_GAUGE));
287 } /* }}} int statsd_handle_gauge */
289 static int statsd_handle_timer (char const *name, /* {{{ */
290 char const *value_str,
291 char const *extra)
292 {
293 statsd_metric_t *metric;
294 value_t value_ms;
295 value_t scale;
296 cdtime_t value;
297 int status;
299 if ((extra != NULL) && (extra[0] != '@'))
300 return (-1);
302 scale.gauge = 1.0;
303 if (extra != NULL)
304 {
305 status = statsd_parse_value (extra + 1, &scale);
306 if (status != 0)
307 return (status);
309 if (!isfinite (scale.gauge) || (scale.gauge <= 0.0) || (scale.gauge > 1.0))
310 return (-1);
311 }
313 value_ms.derive = 0;
314 status = statsd_parse_value (value_str, &value_ms);
315 if (status != 0)
316 return (status);
318 value = MS_TO_CDTIME_T (value_ms.gauge / scale.gauge);
320 pthread_mutex_lock (&metrics_lock);
322 metric = statsd_metric_lookup_unsafe (name, STATSD_TIMER);
323 if (metric == NULL)
324 {
325 pthread_mutex_unlock (&metrics_lock);
326 return (-1);
327 }
329 if (metric->latency == NULL)
330 metric->latency = latency_counter_create ();
331 if (metric->latency == NULL)
332 {
333 pthread_mutex_unlock (&metrics_lock);
334 return (-1);
335 }
337 latency_counter_add (metric->latency, value);
338 metric->updates_num++;
340 pthread_mutex_unlock (&metrics_lock);
341 return (0);
342 } /* }}} int statsd_handle_timer */
344 static int statsd_handle_set (char const *name, /* {{{ */
345 char const *set_key_orig)
346 {
347 statsd_metric_t *metric = NULL;
348 char *set_key;
349 int status;
351 pthread_mutex_lock (&metrics_lock);
353 metric = statsd_metric_lookup_unsafe (name, STATSD_SET);
354 if (metric == NULL)
355 {
356 pthread_mutex_unlock (&metrics_lock);
357 return (-1);
358 }
360 /* Make sure metric->set exists. */
361 if (metric->set == NULL)
362 metric->set = c_avl_create ((void *) strcmp);
364 if (metric->set == NULL)
365 {
366 pthread_mutex_unlock (&metrics_lock);
367 ERROR ("statsd plugin: c_avl_create failed.");
368 return (-1);
369 }
371 set_key = strdup (set_key_orig);
372 if (set_key == NULL)
373 {
374 pthread_mutex_unlock (&metrics_lock);
375 ERROR ("statsd plugin: strdup failed.");
376 return (-1);
377 }
379 status = c_avl_insert (metric->set, set_key, /* value = */ NULL);
380 if (status < 0)
381 {
382 pthread_mutex_unlock (&metrics_lock);
383 if (status < 0)
384 ERROR ("statsd plugin: c_avl_insert (\"%s\") failed with status %i.",
385 set_key, status);
386 sfree (set_key);
387 return (-1);
388 }
389 else if (status > 0) /* key already exists */
390 {
391 sfree (set_key);
392 }
394 metric->updates_num++;
396 pthread_mutex_unlock (&metrics_lock);
397 return (0);
398 } /* }}} int statsd_handle_set */
400 static int statsd_parse_line (char *buffer) /* {{{ */
401 {
402 char *name = buffer;
403 char *value;
404 char *type;
405 char *extra;
407 type = strchr (name, '|');
408 if (type == NULL)
409 return (-1);
410 *type = 0;
411 type++;
413 value = strrchr (name, ':');
414 if (value == NULL)
415 return (-1);
416 *value = 0;
417 value++;
419 extra = strchr (type, '|');
420 if (extra != NULL)
421 {
422 *extra = 0;
423 extra++;
424 }
426 if (strcmp ("c", type) == 0)
427 return (statsd_handle_counter (name, value, extra));
428 else if (strcmp ("ms", type) == 0)
429 return (statsd_handle_timer (name, value, extra));
431 /* extra is only valid for counters and timers */
432 if (extra != NULL)
433 return (-1);
435 if (strcmp ("g", type) == 0)
436 return (statsd_handle_gauge (name, value));
437 else if (strcmp ("s", type) == 0)
438 return (statsd_handle_set (name, value));
439 else
440 return (-1);
441 } /* }}} void statsd_parse_line */
443 static void statsd_parse_buffer (char *buffer) /* {{{ */
444 {
445 while (buffer != NULL)
446 {
447 char orig[64];
448 char *next;
449 int status;
451 next = strchr (buffer, '\n');
452 if (next != NULL)
453 {
454 *next = 0;
455 next++;
456 }
458 if (*buffer == 0)
459 {
460 buffer = next;
461 continue;
462 }
464 sstrncpy (orig, buffer, sizeof (orig));
466 status = statsd_parse_line (buffer);
467 if (status != 0)
468 ERROR ("statsd plugin: Unable to parse line: \"%s\"", orig);
470 buffer = next;
471 }
472 } /* }}} void statsd_parse_buffer */
474 static void statsd_network_read (int fd) /* {{{ */
475 {
476 char buffer[4096];
477 size_t buffer_size;
478 ssize_t status;
480 status = recv (fd, buffer, sizeof (buffer), /* flags = */ MSG_DONTWAIT);
481 if (status < 0)
482 {
483 char errbuf[1024];
485 if ((errno == EAGAIN) || (errno == EWOULDBLOCK))
486 return;
488 ERROR ("statsd plugin: recv(2) failed: %s",
489 sstrerror (errno, errbuf, sizeof (errbuf)));
490 return;
491 }
493 buffer_size = (size_t) status;
494 if (buffer_size >= sizeof (buffer))
495 buffer_size = sizeof (buffer) - 1;
496 buffer[buffer_size] = 0;
498 statsd_parse_buffer (buffer);
499 } /* }}} void statsd_network_read */
501 static int statsd_network_init (struct pollfd **ret_fds, /* {{{ */
502 size_t *ret_fds_num)
503 {
504 struct pollfd *fds = NULL;
505 size_t fds_num = 0;
507 struct addrinfo ai_hints;
508 struct addrinfo *ai_list = NULL;
509 struct addrinfo *ai_ptr;
510 int status;
512 char const *node = (conf_node != NULL) ? conf_node : STATSD_DEFAULT_NODE;
513 char const *service = (conf_service != NULL)
514 ? conf_service : STATSD_DEFAULT_SERVICE;
516 memset (&ai_hints, 0, sizeof (ai_hints));
517 ai_hints.ai_flags = AI_PASSIVE;
518 #ifdef AI_ADDRCONFIG
519 ai_hints.ai_flags |= AI_ADDRCONFIG;
520 #endif
521 ai_hints.ai_family = AF_UNSPEC;
522 ai_hints.ai_socktype = SOCK_DGRAM;
524 status = getaddrinfo (node, service, &ai_hints, &ai_list);
525 if (status != 0)
526 {
527 ERROR ("statsd plugin: getaddrinfo (\"%s\", \"%s\") failed: %s",
528 node, service, gai_strerror (status));
529 return (status);
530 }
532 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
533 {
534 int fd;
535 struct pollfd *tmp;
537 char dbg_node[NI_MAXHOST];
538 char dbg_service[NI_MAXSERV];
540 fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
541 if (fd < 0)
542 {
543 char errbuf[1024];
544 ERROR ("statsd plugin: socket(2) failed: %s",
545 sstrerror (errno, errbuf, sizeof (errbuf)));
546 continue;
547 }
549 getnameinfo (ai_ptr->ai_addr, ai_ptr->ai_addrlen,
550 dbg_node, sizeof (dbg_node), dbg_service, sizeof (dbg_service),
551 NI_DGRAM | NI_NUMERICHOST | NI_NUMERICSERV);
552 DEBUG ("statsd plugin: Trying to bind to [%s]:%s ...", dbg_node, dbg_service);
554 status = bind (fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
555 if (status != 0)
556 {
557 char errbuf[1024];
558 ERROR ("statsd plugin: bind(2) failed: %s",
559 sstrerror (errno, errbuf, sizeof (errbuf)));
560 close (fd);
561 continue;
562 }
564 tmp = realloc (fds, sizeof (*fds) * (fds_num + 1));
565 if (tmp == NULL)
566 {
567 ERROR ("statsd plugin: realloc failed.");
568 close (fd);
569 continue;
570 }
571 fds = tmp;
572 tmp = fds + fds_num;
573 fds_num++;
575 memset (tmp, 0, sizeof (*tmp));
576 tmp->fd = fd;
577 tmp->events = POLLIN | POLLPRI;
578 }
580 freeaddrinfo (ai_list);
582 if (fds_num == 0)
583 {
584 ERROR ("statsd plugin: Unable to create listening socket for [%s]:%s.",
585 (node != NULL) ? node : "::", service);
586 return (ENOENT);
587 }
589 *ret_fds = fds;
590 *ret_fds_num = fds_num;
591 return (0);
592 } /* }}} int statsd_network_init */
594 static void *statsd_network_thread (void *args) /* {{{ */
595 {
596 struct pollfd *fds = NULL;
597 size_t fds_num = 0;
598 int status;
599 size_t i;
601 status = statsd_network_init (&fds, &fds_num);
602 if (status != 0)
603 {
604 ERROR ("statsd plugin: Unable to open listening sockets.");
605 pthread_exit ((void *) 0);
606 }
608 while (!network_thread_shutdown)
609 {
610 status = poll (fds, (nfds_t) fds_num, /* timeout = */ -1);
611 if (status < 0)
612 {
613 char errbuf[1024];
615 if ((errno == EINTR) || (errno == EAGAIN))
616 continue;
618 ERROR ("statsd plugin: poll(2) failed: %s",
619 sstrerror (errno, errbuf, sizeof (errbuf)));
620 break;
621 }
623 for (i = 0; i < fds_num; i++)
624 {
625 if ((fds[i].revents & (POLLIN | POLLPRI)) == 0)
626 continue;
628 statsd_network_read (fds[i].fd);
629 fds[i].revents = 0;
630 }
631 } /* while (!network_thread_shutdown) */
633 /* Clean up */
634 for (i = 0; i < fds_num; i++)
635 close (fds[i].fd);
636 sfree (fds);
638 return ((void *) 0);
639 } /* }}} void *statsd_network_thread */
641 static int statsd_config_timer_percentile (oconfig_item_t *ci) /* {{{ */
642 {
643 double percent = NAN;
644 double *tmp;
645 int status;
647 status = cf_util_get_double (ci, &percent);
648 if (status != 0)
649 return (status);
651 if ((percent <= 0.0) || (percent >= 100))
652 {
653 ERROR ("statsd plugin: The value for \"%s\" must be between 0 and 100, "
654 "exclusively.", ci->key);
655 return (ERANGE);
656 }
658 tmp = realloc (conf_timer_percentile,
659 sizeof (*conf_timer_percentile) * (conf_timer_percentile_num + 1));
660 if (tmp == NULL)
661 {
662 ERROR ("statsd plugin: realloc failed.");
663 return (ENOMEM);
664 }
665 conf_timer_percentile = tmp;
666 conf_timer_percentile[conf_timer_percentile_num] = percent;
667 conf_timer_percentile_num++;
669 return (0);
670 } /* }}} int statsd_config_timer_percentile */
672 static int statsd_config (oconfig_item_t *ci) /* {{{ */
673 {
674 int i;
676 for (i = 0; i < ci->children_num; i++)
677 {
678 oconfig_item_t *child = ci->children + i;
680 if (strcasecmp ("Host", child->key) == 0)
681 cf_util_get_string (child, &conf_node);
682 else if (strcasecmp ("Port", child->key) == 0)
683 cf_util_get_service (child, &conf_service);
684 else if (strcasecmp ("DeleteCounters", child->key) == 0)
685 cf_util_get_boolean (child, &conf_delete_counters);
686 else if (strcasecmp ("DeleteTimers", child->key) == 0)
687 cf_util_get_boolean (child, &conf_delete_timers);
688 else if (strcasecmp ("DeleteGauges", child->key) == 0)
689 cf_util_get_boolean (child, &conf_delete_gauges);
690 else if (strcasecmp ("DeleteSets", child->key) == 0)
691 cf_util_get_boolean (child, &conf_delete_sets);
692 else if (strcasecmp ("CounterSum", child->key) == 0)
693 cf_util_get_boolean (child, &conf_counter_sum);
694 else if (strcasecmp ("TimerLower", child->key) == 0)
695 cf_util_get_boolean (child, &conf_timer_lower);
696 else if (strcasecmp ("TimerUpper", child->key) == 0)
697 cf_util_get_boolean (child, &conf_timer_upper);
698 else if (strcasecmp ("TimerSum", child->key) == 0)
699 cf_util_get_boolean (child, &conf_timer_sum);
700 else if (strcasecmp ("TimerCount", child->key) == 0)
701 cf_util_get_boolean (child, &conf_timer_count);
702 else if (strcasecmp ("TimerPercentile", child->key) == 0)
703 statsd_config_timer_percentile (child);
704 else
705 ERROR ("statsd plugin: The \"%s\" config option is not valid.",
706 child->key);
707 }
709 return (0);
710 } /* }}} int statsd_config */
712 static int statsd_init (void) /* {{{ */
713 {
714 pthread_mutex_lock (&metrics_lock);
715 if (metrics_tree == NULL)
716 metrics_tree = c_avl_create ((void *) strcmp);
718 if (!network_thread_running)
719 {
720 int status;
722 status = pthread_create (&network_thread,
723 /* attr = */ NULL,
724 statsd_network_thread,
725 /* args = */ NULL);
726 if (status != 0)
727 {
728 char errbuf[1024];
729 pthread_mutex_unlock (&metrics_lock);
730 ERROR ("statsd plugin: pthread_create failed: %s",
731 sstrerror (errno, errbuf, sizeof (errbuf)));
732 return (status);
733 }
734 }
735 network_thread_running = 1;
737 pthread_mutex_unlock (&metrics_lock);
739 return (0);
740 } /* }}} int statsd_init */
742 /* Must hold metrics_lock when calling this function. */
743 static int statsd_metric_clear_set_unsafe (statsd_metric_t *metric) /* {{{ */
744 {
745 void *key;
746 void *value;
748 if ((metric == NULL) || (metric->type != STATSD_SET))
749 return (EINVAL);
751 if (metric->set == NULL)
752 return (0);
754 while (c_avl_pick (metric->set, &key, &value) == 0)
755 {
756 sfree (key);
757 sfree (value);
758 }
760 return (0);
761 } /* }}} int statsd_metric_clear_set_unsafe */
763 /* Must hold metrics_lock when calling this function. */
764 static int statsd_metric_submit_unsafe (char const *name, statsd_metric_t *metric) /* {{{ */
765 {
766 value_t values[1];
767 value_list_t vl = VALUE_LIST_INIT;
769 vl.values = values;
770 vl.values_len = 1;
771 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
772 sstrncpy (vl.plugin, "statsd", sizeof (vl.plugin));
774 if (metric->type == STATSD_GAUGE)
775 sstrncpy (vl.type, "gauge", sizeof (vl.type));
776 else if (metric->type == STATSD_TIMER)
777 sstrncpy (vl.type, "latency", sizeof (vl.type));
778 else if (metric->type == STATSD_SET)
779 sstrncpy (vl.type, "objects", sizeof (vl.type));
780 else /* if (metric->type == STATSD_COUNTER) */
781 sstrncpy (vl.type, "derive", sizeof (vl.type));
783 sstrncpy (vl.type_instance, name, sizeof (vl.type_instance));
785 if (metric->type == STATSD_GAUGE)
786 values[0].gauge = (gauge_t) metric->value;
787 else if (metric->type == STATSD_TIMER)
788 {
789 size_t i;
790 _Bool have_events = (metric->updates_num > 0);
792 /* Make sure all timer metrics share the *same* timestamp. */
793 vl.time = cdtime ();
795 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
796 "%s-average", name);
797 values[0].gauge = have_events
798 ? CDTIME_T_TO_DOUBLE (latency_counter_get_average (metric->latency))
799 : NAN;
800 plugin_dispatch_values (&vl);
802 if (conf_timer_lower) {
803 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
804 "%s-lower", name);
805 values[0].gauge = have_events
806 ? CDTIME_T_TO_DOUBLE (latency_counter_get_min (metric->latency))
807 : NAN;
808 plugin_dispatch_values (&vl);
809 }
811 if (conf_timer_upper) {
812 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
813 "%s-upper", name);
814 values[0].gauge = have_events
815 ? CDTIME_T_TO_DOUBLE (latency_counter_get_max (metric->latency))
816 : NAN;
817 plugin_dispatch_values (&vl);
818 }
820 if (conf_timer_sum) {
821 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
822 "%s-sum", name);
823 values[0].gauge = have_events
824 ? CDTIME_T_TO_DOUBLE (latency_counter_get_sum (metric->latency))
825 : NAN;
826 plugin_dispatch_values (&vl);
827 }
829 for (i = 0; i < conf_timer_percentile_num; i++)
830 {
831 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
832 "%s-percentile-%.0f", name, conf_timer_percentile[i]);
833 values[0].gauge = have_events
834 ? CDTIME_T_TO_DOUBLE (latency_counter_get_percentile (metric->latency, conf_timer_percentile[i]))
835 : NAN;
836 plugin_dispatch_values (&vl);
837 }
839 /* Keep this at the end, since vl.type is set to "gauge" here. The
840 * vl.type's above are implicitly set to "latency". */
841 if (conf_timer_count) {
842 sstrncpy (vl.type, "gauge", sizeof (vl.type));
843 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
844 "%s-count", name);
845 values[0].gauge = latency_counter_get_num (metric->latency);
846 plugin_dispatch_values (&vl);
847 }
849 latency_counter_reset (metric->latency);
850 return (0);
851 }
852 else if (metric->type == STATSD_SET)
853 {
854 if (metric->set == NULL)
855 values[0].gauge = 0.0;
856 else
857 values[0].gauge = (gauge_t) c_avl_size (metric->set);
858 }
859 else { /* STATSD_COUNTER */
860 gauge_t delta = nearbyint (metric->value);
862 /* Etsy's statsd writes counters as two metrics: a rate and the change since
863 * the last write. Since collectd does not reset its DERIVE metrics to zero,
864 * this makes little sense, but we're dispatching a "count" metric here
865 * anyway - if requested by the user - for compatibility reasons. */
866 if (conf_counter_sum)
867 {
868 sstrncpy (vl.type, "count", sizeof (vl.type));
869 values[0].gauge = delta;
870 plugin_dispatch_values (&vl);
872 /* restore vl.type */
873 sstrncpy (vl.type, "derive", sizeof (vl.type));
874 }
876 /* Rather than resetting value to zero, subtract delta so we correctly keep
877 * track of residuals. */
878 metric->value -= delta;
879 metric->counter += (derive_t) delta;
881 values[0].derive = metric->counter;
882 }
884 return (plugin_dispatch_values (&vl));
885 } /* }}} int statsd_metric_submit_unsafe */
887 static int statsd_read (void) /* {{{ */
888 {
889 c_avl_iterator_t *iter;
890 char *name;
891 statsd_metric_t *metric;
893 char **to_be_deleted = NULL;
894 size_t to_be_deleted_num = 0;
895 size_t i;
897 pthread_mutex_lock (&metrics_lock);
899 if (metrics_tree == NULL)
900 {
901 pthread_mutex_unlock (&metrics_lock);
902 return (0);
903 }
905 iter = c_avl_get_iterator (metrics_tree);
906 while (c_avl_iterator_next (iter, (void *) &name, (void *) &metric) == 0)
907 {
908 if ((metric->updates_num == 0)
909 && ((conf_delete_counters && (metric->type == STATSD_COUNTER))
910 || (conf_delete_timers && (metric->type == STATSD_TIMER))
911 || (conf_delete_gauges && (metric->type == STATSD_GAUGE))
912 || (conf_delete_sets && (metric->type == STATSD_SET))))
913 {
914 DEBUG ("statsd plugin: Deleting metric \"%s\".", name);
915 strarray_add (&to_be_deleted, &to_be_deleted_num, name);
916 continue;
917 }
919 /* Names have a prefix, e.g. "c:", which determines the (statsd) type.
920 * Remove this here. */
921 statsd_metric_submit_unsafe (name + 2, metric);
923 /* Reset the metric. */
924 metric->updates_num = 0;
925 if (metric->type == STATSD_SET)
926 statsd_metric_clear_set_unsafe (metric);
927 }
928 c_avl_iterator_destroy (iter);
930 for (i = 0; i < to_be_deleted_num; i++)
931 {
932 int status;
934 status = c_avl_remove (metrics_tree, to_be_deleted[i],
935 (void *) &name, (void *) &metric);
936 if (status != 0)
937 {
938 ERROR ("stats plugin: c_avl_remove (\"%s\") failed with status %i.",
939 to_be_deleted[i], status);
940 continue;
941 }
943 sfree (name);
944 statsd_metric_free (metric);
945 }
947 pthread_mutex_unlock (&metrics_lock);
949 strarray_free (to_be_deleted, to_be_deleted_num);
951 return (0);
952 } /* }}} int statsd_read */
954 static int statsd_shutdown (void) /* {{{ */
955 {
956 void *key;
957 void *value;
959 pthread_mutex_lock (&metrics_lock);
961 if (network_thread_running)
962 {
963 network_thread_shutdown = 1;
964 pthread_kill (network_thread, SIGTERM);
965 pthread_join (network_thread, /* retval = */ NULL);
966 }
967 network_thread_running = 0;
969 while (c_avl_pick (metrics_tree, &key, &value) == 0)
970 {
971 sfree (key);
972 statsd_metric_free (value);
973 }
974 c_avl_destroy (metrics_tree);
975 metrics_tree = NULL;
977 sfree (conf_node);
978 sfree (conf_service);
980 pthread_mutex_unlock (&metrics_lock);
982 return (0);
983 } /* }}} int statsd_shutdown */
985 void module_register (void)
986 {
987 plugin_register_complex_config ("statsd", statsd_config);
988 plugin_register_init ("statsd", statsd_init);
989 plugin_register_read ("statsd", statsd_read);
990 plugin_register_shutdown ("statsd", statsd_shutdown);
991 }
993 /* vim: set sw=2 sts=2 et fdm=marker : */