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_latency.h"
34 #include <sys/types.h>
35 #include <netdb.h>
36 #include <poll.h>
38 /* AIX doesn't have MSG_DONTWAIT */
39 #ifndef MSG_DONTWAIT
40 # define MSG_DONTWAIT MSG_NONBLOCK
41 #endif
43 #ifndef STATSD_DEFAULT_NODE
44 # define STATSD_DEFAULT_NODE NULL
45 #endif
47 #ifndef STATSD_DEFAULT_SERVICE
48 # define STATSD_DEFAULT_SERVICE "8125"
49 #endif
51 enum metric_type_e
52 {
53 STATSD_COUNTER,
54 STATSD_TIMER,
55 STATSD_GAUGE,
56 STATSD_SET
57 };
58 typedef enum metric_type_e metric_type_t;
60 struct statsd_metric_s
61 {
62 metric_type_t type;
63 double value;
64 derive_t counter;
65 latency_counter_t *latency;
66 c_avl_tree_t *set;
67 unsigned long updates_num;
68 };
69 typedef struct statsd_metric_s statsd_metric_t;
71 static c_avl_tree_t *metrics_tree = NULL;
72 static pthread_mutex_t metrics_lock = PTHREAD_MUTEX_INITIALIZER;
74 static pthread_t network_thread;
75 static _Bool network_thread_running = 0;
76 static _Bool network_thread_shutdown = 0;
78 static char *conf_node = NULL;
79 static char *conf_service = NULL;
81 static _Bool conf_delete_counters = 0;
82 static _Bool conf_delete_timers = 0;
83 static _Bool conf_delete_gauges = 0;
84 static _Bool conf_delete_sets = 0;
86 static double *conf_timer_percentile = NULL;
87 static size_t conf_timer_percentile_num = 0;
89 static _Bool conf_counter_sum = 0;
90 static _Bool conf_timer_lower = 0;
91 static _Bool conf_timer_upper = 0;
92 static _Bool conf_timer_sum = 0;
93 static _Bool conf_timer_count = 0;
95 /* Must hold metrics_lock when calling this function. */
96 static statsd_metric_t *statsd_metric_lookup_unsafe (char const *name, /* {{{ */
97 metric_type_t type)
98 {
99 char key[DATA_MAX_NAME_LEN + 2];
100 char *key_copy;
101 statsd_metric_t *metric;
102 int status;
104 switch (type)
105 {
106 case STATSD_COUNTER: key[0] = 'c'; break;
107 case STATSD_TIMER: key[0] = 't'; break;
108 case STATSD_GAUGE: key[0] = 'g'; break;
109 case STATSD_SET: key[0] = 's'; break;
110 default: return (NULL);
111 }
113 key[1] = ':';
114 sstrncpy (&key[2], name, sizeof (key) - 2);
116 status = c_avl_get (metrics_tree, key, (void *) &metric);
117 if (status == 0)
118 return (metric);
120 key_copy = strdup (key);
121 if (key_copy == NULL)
122 {
123 ERROR ("statsd plugin: strdup failed.");
124 return (NULL);
125 }
127 metric = calloc (1, sizeof (*metric));
128 if (metric == NULL)
129 {
130 ERROR ("statsd plugin: calloc failed.");
131 sfree (key_copy);
132 return (NULL);
133 }
135 metric->type = type;
136 metric->latency = NULL;
137 metric->set = NULL;
139 status = c_avl_insert (metrics_tree, key_copy, metric);
140 if (status != 0)
141 {
142 ERROR ("statsd plugin: c_avl_insert failed.");
143 sfree (key_copy);
144 sfree (metric);
145 return (NULL);
146 }
148 return (metric);
149 } /* }}} statsd_metric_lookup_unsafe */
151 static int statsd_metric_set (char const *name, double value, /* {{{ */
152 metric_type_t type)
153 {
154 statsd_metric_t *metric;
156 pthread_mutex_lock (&metrics_lock);
158 metric = statsd_metric_lookup_unsafe (name, type);
159 if (metric == NULL)
160 {
161 pthread_mutex_unlock (&metrics_lock);
162 return (-1);
163 }
165 metric->value = value;
166 metric->updates_num++;
168 pthread_mutex_unlock (&metrics_lock);
170 return (0);
171 } /* }}} int statsd_metric_set */
173 static int statsd_metric_add (char const *name, double delta, /* {{{ */
174 metric_type_t type)
175 {
176 statsd_metric_t *metric;
178 pthread_mutex_lock (&metrics_lock);
180 metric = statsd_metric_lookup_unsafe (name, type);
181 if (metric == NULL)
182 {
183 pthread_mutex_unlock (&metrics_lock);
184 return (-1);
185 }
187 metric->value += delta;
188 metric->updates_num++;
190 pthread_mutex_unlock (&metrics_lock);
192 return (0);
193 } /* }}} int statsd_metric_add */
195 static void statsd_metric_free (statsd_metric_t *metric) /* {{{ */
196 {
197 if (metric == NULL)
198 return;
200 if (metric->latency != NULL)
201 {
202 latency_counter_destroy (metric->latency);
203 metric->latency = NULL;
204 }
206 if (metric->set != NULL)
207 {
208 void *key;
209 void *value;
211 while (c_avl_pick (metric->set, &key, &value) == 0)
212 {
213 sfree (key);
214 assert (value == NULL);
215 }
217 c_avl_destroy (metric->set);
218 metric->set = NULL;
219 }
221 sfree (metric);
222 } /* }}} void statsd_metric_free */
224 static int statsd_parse_value (char const *str, value_t *ret_value) /* {{{ */
225 {
226 char *endptr = NULL;
228 ret_value->gauge = (gauge_t) strtod (str, &endptr);
229 if ((str == endptr) || ((endptr != NULL) && (*endptr != 0)))
230 return (-1);
232 return (0);
233 } /* }}} int statsd_parse_value */
235 static int statsd_handle_counter (char const *name, /* {{{ */
236 char const *value_str,
237 char const *extra)
238 {
239 value_t value;
240 value_t scale;
241 int status;
243 if ((extra != NULL) && (extra[0] != '@'))
244 return (-1);
246 scale.gauge = 1.0;
247 if (extra != NULL)
248 {
249 status = statsd_parse_value (extra + 1, &scale);
250 if (status != 0)
251 return (status);
253 if (!isfinite (scale.gauge) || (scale.gauge <= 0.0) || (scale.gauge > 1.0))
254 return (-1);
255 }
257 value.gauge = 1.0;
258 status = statsd_parse_value (value_str, &value);
259 if (status != 0)
260 return (status);
262 /* Changes to the counter are added to (statsd_metric_t*)->value. ->counter is
263 * only updated in statsd_metric_submit_unsafe(). */
264 return (statsd_metric_add (name, (double) (value.gauge / scale.gauge),
265 STATSD_COUNTER));
266 } /* }}} int statsd_handle_counter */
268 static int statsd_handle_gauge (char const *name, /* {{{ */
269 char const *value_str)
270 {
271 value_t value;
272 int status;
274 value.gauge = 0;
275 status = statsd_parse_value (value_str, &value);
276 if (status != 0)
277 return (status);
279 if ((value_str[0] == '+') || (value_str[0] == '-'))
280 return (statsd_metric_add (name, (double) value.gauge, STATSD_GAUGE));
281 else
282 return (statsd_metric_set (name, (double) value.gauge, STATSD_GAUGE));
283 } /* }}} int statsd_handle_gauge */
285 static int statsd_handle_timer (char const *name, /* {{{ */
286 char const *value_str,
287 char const *extra)
288 {
289 statsd_metric_t *metric;
290 value_t value_ms;
291 value_t scale;
292 cdtime_t value;
293 int status;
295 if ((extra != NULL) && (extra[0] != '@'))
296 return (-1);
298 scale.gauge = 1.0;
299 if (extra != NULL)
300 {
301 status = statsd_parse_value (extra + 1, &scale);
302 if (status != 0)
303 return (status);
305 if (!isfinite (scale.gauge) || (scale.gauge <= 0.0) || (scale.gauge > 1.0))
306 return (-1);
307 }
309 value_ms.derive = 0;
310 status = statsd_parse_value (value_str, &value_ms);
311 if (status != 0)
312 return (status);
314 value = MS_TO_CDTIME_T (value_ms.gauge / scale.gauge);
316 pthread_mutex_lock (&metrics_lock);
318 metric = statsd_metric_lookup_unsafe (name, STATSD_TIMER);
319 if (metric == NULL)
320 {
321 pthread_mutex_unlock (&metrics_lock);
322 return (-1);
323 }
325 if (metric->latency == NULL)
326 metric->latency = latency_counter_create ();
327 if (metric->latency == NULL)
328 {
329 pthread_mutex_unlock (&metrics_lock);
330 return (-1);
331 }
333 latency_counter_add (metric->latency, value);
334 metric->updates_num++;
336 pthread_mutex_unlock (&metrics_lock);
337 return (0);
338 } /* }}} int statsd_handle_timer */
340 static int statsd_handle_set (char const *name, /* {{{ */
341 char const *set_key_orig)
342 {
343 statsd_metric_t *metric = NULL;
344 char *set_key;
345 int status;
347 pthread_mutex_lock (&metrics_lock);
349 metric = statsd_metric_lookup_unsafe (name, STATSD_SET);
350 if (metric == NULL)
351 {
352 pthread_mutex_unlock (&metrics_lock);
353 return (-1);
354 }
356 /* Make sure metric->set exists. */
357 if (metric->set == NULL)
358 metric->set = c_avl_create ((int (*) (const void *, const void *)) strcmp);
360 if (metric->set == NULL)
361 {
362 pthread_mutex_unlock (&metrics_lock);
363 ERROR ("statsd plugin: c_avl_create failed.");
364 return (-1);
365 }
367 set_key = strdup (set_key_orig);
368 if (set_key == NULL)
369 {
370 pthread_mutex_unlock (&metrics_lock);
371 ERROR ("statsd plugin: strdup failed.");
372 return (-1);
373 }
375 status = c_avl_insert (metric->set, set_key, /* value = */ NULL);
376 if (status < 0)
377 {
378 pthread_mutex_unlock (&metrics_lock);
379 if (status < 0)
380 ERROR ("statsd plugin: c_avl_insert (\"%s\") failed with status %i.",
381 set_key, status);
382 sfree (set_key);
383 return (-1);
384 }
385 else if (status > 0) /* key already exists */
386 {
387 sfree (set_key);
388 }
390 metric->updates_num++;
392 pthread_mutex_unlock (&metrics_lock);
393 return (0);
394 } /* }}} int statsd_handle_set */
396 static int statsd_parse_line (char *buffer) /* {{{ */
397 {
398 char *name = buffer;
399 char *value;
400 char *type;
401 char *extra;
403 type = strchr (name, '|');
404 if (type == NULL)
405 return (-1);
406 *type = 0;
407 type++;
409 value = strrchr (name, ':');
410 if (value == NULL)
411 return (-1);
412 *value = 0;
413 value++;
415 extra = strchr (type, '|');
416 if (extra != NULL)
417 {
418 *extra = 0;
419 extra++;
420 }
422 if (strcmp ("c", type) == 0)
423 return (statsd_handle_counter (name, value, extra));
424 else if (strcmp ("ms", type) == 0)
425 return (statsd_handle_timer (name, value, extra));
427 /* extra is only valid for counters and timers */
428 if (extra != NULL)
429 return (-1);
431 if (strcmp ("g", type) == 0)
432 return (statsd_handle_gauge (name, value));
433 else if (strcmp ("s", type) == 0)
434 return (statsd_handle_set (name, value));
435 else
436 return (-1);
437 } /* }}} void statsd_parse_line */
439 static void statsd_parse_buffer (char *buffer) /* {{{ */
440 {
441 while (buffer != NULL)
442 {
443 char orig[64];
444 char *next;
445 int status;
447 next = strchr (buffer, '\n');
448 if (next != NULL)
449 {
450 *next = 0;
451 next++;
452 }
454 if (*buffer == 0)
455 {
456 buffer = next;
457 continue;
458 }
460 sstrncpy (orig, buffer, sizeof (orig));
462 status = statsd_parse_line (buffer);
463 if (status != 0)
464 ERROR ("statsd plugin: Unable to parse line: \"%s\"", orig);
466 buffer = next;
467 }
468 } /* }}} void statsd_parse_buffer */
470 static void statsd_network_read (int fd) /* {{{ */
471 {
472 char buffer[4096];
473 size_t buffer_size;
474 ssize_t status;
476 status = recv (fd, buffer, sizeof (buffer), /* flags = */ MSG_DONTWAIT);
477 if (status < 0)
478 {
479 char errbuf[1024];
481 if ((errno == EAGAIN) || (errno == EWOULDBLOCK))
482 return;
484 ERROR ("statsd plugin: recv(2) failed: %s",
485 sstrerror (errno, errbuf, sizeof (errbuf)));
486 return;
487 }
489 buffer_size = (size_t) status;
490 if (buffer_size >= sizeof (buffer))
491 buffer_size = sizeof (buffer) - 1;
492 buffer[buffer_size] = 0;
494 statsd_parse_buffer (buffer);
495 } /* }}} void statsd_network_read */
497 static int statsd_network_init (struct pollfd **ret_fds, /* {{{ */
498 size_t *ret_fds_num)
499 {
500 struct pollfd *fds = NULL;
501 size_t fds_num = 0;
503 struct addrinfo ai_hints = { 0 };
504 struct addrinfo *ai_list = NULL;
505 struct addrinfo *ai_ptr;
506 int status;
508 char const *node = (conf_node != NULL) ? conf_node : STATSD_DEFAULT_NODE;
509 char const *service = (conf_service != NULL)
510 ? conf_service : STATSD_DEFAULT_SERVICE;
512 ai_hints.ai_flags = AI_PASSIVE;
513 #ifdef AI_ADDRCONFIG
514 ai_hints.ai_flags |= AI_ADDRCONFIG;
515 #endif
516 ai_hints.ai_family = AF_UNSPEC;
517 ai_hints.ai_socktype = SOCK_DGRAM;
519 status = getaddrinfo (node, service, &ai_hints, &ai_list);
520 if (status != 0)
521 {
522 ERROR ("statsd plugin: getaddrinfo (\"%s\", \"%s\") failed: %s",
523 node, service, gai_strerror (status));
524 return (status);
525 }
527 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
528 {
529 int fd;
530 struct pollfd *tmp;
532 char dbg_node[NI_MAXHOST];
533 char dbg_service[NI_MAXSERV];
535 fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
536 if (fd < 0)
537 {
538 char errbuf[1024];
539 ERROR ("statsd plugin: socket(2) failed: %s",
540 sstrerror (errno, errbuf, sizeof (errbuf)));
541 continue;
542 }
544 getnameinfo (ai_ptr->ai_addr, ai_ptr->ai_addrlen,
545 dbg_node, sizeof (dbg_node), dbg_service, sizeof (dbg_service),
546 NI_DGRAM | NI_NUMERICHOST | NI_NUMERICSERV);
547 DEBUG ("statsd plugin: Trying to bind to [%s]:%s ...", dbg_node, dbg_service);
549 status = bind (fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
550 if (status != 0)
551 {
552 char errbuf[1024];
553 ERROR ("statsd plugin: bind(2) failed: %s",
554 sstrerror (errno, errbuf, sizeof (errbuf)));
555 close (fd);
556 continue;
557 }
559 tmp = realloc (fds, sizeof (*fds) * (fds_num + 1));
560 if (tmp == NULL)
561 {
562 ERROR ("statsd plugin: realloc failed.");
563 close (fd);
564 continue;
565 }
566 fds = tmp;
567 tmp = fds + fds_num;
568 fds_num++;
570 memset (tmp, 0, sizeof (*tmp));
571 tmp->fd = fd;
572 tmp->events = POLLIN | POLLPRI;
573 }
575 freeaddrinfo (ai_list);
577 if (fds_num == 0)
578 {
579 ERROR ("statsd plugin: Unable to create listening socket for [%s]:%s.",
580 (node != NULL) ? node : "::", service);
581 return (ENOENT);
582 }
584 *ret_fds = fds;
585 *ret_fds_num = fds_num;
586 return (0);
587 } /* }}} int statsd_network_init */
589 static void *statsd_network_thread (void *args) /* {{{ */
590 {
591 struct pollfd *fds = NULL;
592 size_t fds_num = 0;
593 int status;
594 size_t i;
596 status = statsd_network_init (&fds, &fds_num);
597 if (status != 0)
598 {
599 ERROR ("statsd plugin: Unable to open listening sockets.");
600 pthread_exit ((void *) 0);
601 }
603 while (!network_thread_shutdown)
604 {
605 status = poll (fds, (nfds_t) fds_num, /* timeout = */ -1);
606 if (status < 0)
607 {
608 char errbuf[1024];
610 if ((errno == EINTR) || (errno == EAGAIN))
611 continue;
613 ERROR ("statsd plugin: poll(2) failed: %s",
614 sstrerror (errno, errbuf, sizeof (errbuf)));
615 break;
616 }
618 for (i = 0; i < fds_num; i++)
619 {
620 if ((fds[i].revents & (POLLIN | POLLPRI)) == 0)
621 continue;
623 statsd_network_read (fds[i].fd);
624 fds[i].revents = 0;
625 }
626 } /* while (!network_thread_shutdown) */
628 /* Clean up */
629 for (i = 0; i < fds_num; i++)
630 close (fds[i].fd);
631 sfree (fds);
633 return ((void *) 0);
634 } /* }}} void *statsd_network_thread */
636 static int statsd_config_timer_percentile (oconfig_item_t *ci) /* {{{ */
637 {
638 double percent = NAN;
639 double *tmp;
640 int status;
642 status = cf_util_get_double (ci, &percent);
643 if (status != 0)
644 return (status);
646 if ((percent <= 0.0) || (percent >= 100))
647 {
648 ERROR ("statsd plugin: The value for \"%s\" must be between 0 and 100, "
649 "exclusively.", ci->key);
650 return (ERANGE);
651 }
653 tmp = realloc (conf_timer_percentile,
654 sizeof (*conf_timer_percentile) * (conf_timer_percentile_num + 1));
655 if (tmp == NULL)
656 {
657 ERROR ("statsd plugin: realloc failed.");
658 return (ENOMEM);
659 }
660 conf_timer_percentile = tmp;
661 conf_timer_percentile[conf_timer_percentile_num] = percent;
662 conf_timer_percentile_num++;
664 return (0);
665 } /* }}} int statsd_config_timer_percentile */
667 static int statsd_config (oconfig_item_t *ci) /* {{{ */
668 {
669 int i;
671 for (i = 0; i < ci->children_num; i++)
672 {
673 oconfig_item_t *child = ci->children + i;
675 if (strcasecmp ("Host", child->key) == 0)
676 cf_util_get_string (child, &conf_node);
677 else if (strcasecmp ("Port", child->key) == 0)
678 cf_util_get_service (child, &conf_service);
679 else if (strcasecmp ("DeleteCounters", child->key) == 0)
680 cf_util_get_boolean (child, &conf_delete_counters);
681 else if (strcasecmp ("DeleteTimers", child->key) == 0)
682 cf_util_get_boolean (child, &conf_delete_timers);
683 else if (strcasecmp ("DeleteGauges", child->key) == 0)
684 cf_util_get_boolean (child, &conf_delete_gauges);
685 else if (strcasecmp ("DeleteSets", child->key) == 0)
686 cf_util_get_boolean (child, &conf_delete_sets);
687 else if (strcasecmp ("CounterSum", child->key) == 0)
688 cf_util_get_boolean (child, &conf_counter_sum);
689 else if (strcasecmp ("TimerLower", child->key) == 0)
690 cf_util_get_boolean (child, &conf_timer_lower);
691 else if (strcasecmp ("TimerUpper", child->key) == 0)
692 cf_util_get_boolean (child, &conf_timer_upper);
693 else if (strcasecmp ("TimerSum", child->key) == 0)
694 cf_util_get_boolean (child, &conf_timer_sum);
695 else if (strcasecmp ("TimerCount", child->key) == 0)
696 cf_util_get_boolean (child, &conf_timer_count);
697 else if (strcasecmp ("TimerPercentile", child->key) == 0)
698 statsd_config_timer_percentile (child);
699 else
700 ERROR ("statsd plugin: The \"%s\" config option is not valid.",
701 child->key);
702 }
704 return (0);
705 } /* }}} int statsd_config */
707 static int statsd_init (void) /* {{{ */
708 {
709 pthread_mutex_lock (&metrics_lock);
710 if (metrics_tree == NULL)
711 metrics_tree = c_avl_create ((int (*) (const void *, const void *)) strcmp);
713 if (!network_thread_running)
714 {
715 int status;
717 status = pthread_create (&network_thread,
718 /* attr = */ NULL,
719 statsd_network_thread,
720 /* args = */ NULL);
721 if (status != 0)
722 {
723 char errbuf[1024];
724 pthread_mutex_unlock (&metrics_lock);
725 ERROR ("statsd plugin: pthread_create failed: %s",
726 sstrerror (errno, errbuf, sizeof (errbuf)));
727 return (status);
728 }
729 }
730 network_thread_running = 1;
732 pthread_mutex_unlock (&metrics_lock);
734 return (0);
735 } /* }}} int statsd_init */
737 /* Must hold metrics_lock when calling this function. */
738 static int statsd_metric_clear_set_unsafe (statsd_metric_t *metric) /* {{{ */
739 {
740 void *key;
741 void *value;
743 if ((metric == NULL) || (metric->type != STATSD_SET))
744 return (EINVAL);
746 if (metric->set == NULL)
747 return (0);
749 while (c_avl_pick (metric->set, &key, &value) == 0)
750 {
751 sfree (key);
752 sfree (value);
753 }
755 return (0);
756 } /* }}} int statsd_metric_clear_set_unsafe */
758 /* Must hold metrics_lock when calling this function. */
759 static int statsd_metric_submit_unsafe (char const *name, statsd_metric_t *metric) /* {{{ */
760 {
761 value_t values[1];
762 value_list_t vl = VALUE_LIST_INIT;
764 vl.values = values;
765 vl.values_len = 1;
766 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
767 sstrncpy (vl.plugin, "statsd", sizeof (vl.plugin));
769 if (metric->type == STATSD_GAUGE)
770 sstrncpy (vl.type, "gauge", sizeof (vl.type));
771 else if (metric->type == STATSD_TIMER)
772 sstrncpy (vl.type, "latency", sizeof (vl.type));
773 else if (metric->type == STATSD_SET)
774 sstrncpy (vl.type, "objects", sizeof (vl.type));
775 else /* if (metric->type == STATSD_COUNTER) */
776 sstrncpy (vl.type, "derive", sizeof (vl.type));
778 sstrncpy (vl.type_instance, name, sizeof (vl.type_instance));
780 if (metric->type == STATSD_GAUGE)
781 values[0].gauge = (gauge_t) metric->value;
782 else if (metric->type == STATSD_TIMER)
783 {
784 size_t i;
785 _Bool have_events = (metric->updates_num > 0);
787 /* Make sure all timer metrics share the *same* timestamp. */
788 vl.time = cdtime ();
790 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
791 "%s-average", name);
792 values[0].gauge = have_events
793 ? CDTIME_T_TO_DOUBLE (latency_counter_get_average (metric->latency))
794 : NAN;
795 plugin_dispatch_values (&vl);
797 if (conf_timer_lower) {
798 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
799 "%s-lower", name);
800 values[0].gauge = have_events
801 ? CDTIME_T_TO_DOUBLE (latency_counter_get_min (metric->latency))
802 : NAN;
803 plugin_dispatch_values (&vl);
804 }
806 if (conf_timer_upper) {
807 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
808 "%s-upper", name);
809 values[0].gauge = have_events
810 ? CDTIME_T_TO_DOUBLE (latency_counter_get_max (metric->latency))
811 : NAN;
812 plugin_dispatch_values (&vl);
813 }
815 if (conf_timer_sum) {
816 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
817 "%s-sum", name);
818 values[0].gauge = have_events
819 ? CDTIME_T_TO_DOUBLE (latency_counter_get_sum (metric->latency))
820 : NAN;
821 plugin_dispatch_values (&vl);
822 }
824 for (i = 0; i < conf_timer_percentile_num; i++)
825 {
826 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
827 "%s-percentile-%.0f", name, conf_timer_percentile[i]);
828 values[0].gauge = have_events
829 ? CDTIME_T_TO_DOUBLE (latency_counter_get_percentile (metric->latency, conf_timer_percentile[i]))
830 : NAN;
831 plugin_dispatch_values (&vl);
832 }
834 /* Keep this at the end, since vl.type is set to "gauge" here. The
835 * vl.type's above are implicitly set to "latency". */
836 if (conf_timer_count) {
837 sstrncpy (vl.type, "gauge", sizeof (vl.type));
838 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
839 "%s-count", name);
840 values[0].gauge = latency_counter_get_num (metric->latency);
841 plugin_dispatch_values (&vl);
842 }
844 latency_counter_reset (metric->latency);
845 return (0);
846 }
847 else if (metric->type == STATSD_SET)
848 {
849 if (metric->set == NULL)
850 values[0].gauge = 0.0;
851 else
852 values[0].gauge = (gauge_t) c_avl_size (metric->set);
853 }
854 else { /* STATSD_COUNTER */
855 gauge_t delta = nearbyint (metric->value);
857 /* Etsy's statsd writes counters as two metrics: a rate and the change since
858 * the last write. Since collectd does not reset its DERIVE metrics to zero,
859 * this makes little sense, but we're dispatching a "count" metric here
860 * anyway - if requested by the user - for compatibility reasons. */
861 if (conf_counter_sum)
862 {
863 sstrncpy (vl.type, "count", sizeof (vl.type));
864 values[0].gauge = delta;
865 plugin_dispatch_values (&vl);
867 /* restore vl.type */
868 sstrncpy (vl.type, "derive", sizeof (vl.type));
869 }
871 /* Rather than resetting value to zero, subtract delta so we correctly keep
872 * track of residuals. */
873 metric->value -= delta;
874 metric->counter += (derive_t) delta;
876 values[0].derive = metric->counter;
877 }
879 return (plugin_dispatch_values (&vl));
880 } /* }}} int statsd_metric_submit_unsafe */
882 static int statsd_read (void) /* {{{ */
883 {
884 c_avl_iterator_t *iter;
885 char *name;
886 statsd_metric_t *metric;
888 char **to_be_deleted = NULL;
889 size_t to_be_deleted_num = 0;
890 size_t i;
892 pthread_mutex_lock (&metrics_lock);
894 if (metrics_tree == NULL)
895 {
896 pthread_mutex_unlock (&metrics_lock);
897 return (0);
898 }
900 iter = c_avl_get_iterator (metrics_tree);
901 while (c_avl_iterator_next (iter, (void *) &name, (void *) &metric) == 0)
902 {
903 if ((metric->updates_num == 0)
904 && ((conf_delete_counters && (metric->type == STATSD_COUNTER))
905 || (conf_delete_timers && (metric->type == STATSD_TIMER))
906 || (conf_delete_gauges && (metric->type == STATSD_GAUGE))
907 || (conf_delete_sets && (metric->type == STATSD_SET))))
908 {
909 DEBUG ("statsd plugin: Deleting metric \"%s\".", name);
910 strarray_add (&to_be_deleted, &to_be_deleted_num, name);
911 continue;
912 }
914 /* Names have a prefix, e.g. "c:", which determines the (statsd) type.
915 * Remove this here. */
916 statsd_metric_submit_unsafe (name + 2, metric);
918 /* Reset the metric. */
919 metric->updates_num = 0;
920 if (metric->type == STATSD_SET)
921 statsd_metric_clear_set_unsafe (metric);
922 }
923 c_avl_iterator_destroy (iter);
925 for (i = 0; i < to_be_deleted_num; i++)
926 {
927 int status;
929 status = c_avl_remove (metrics_tree, to_be_deleted[i],
930 (void *) &name, (void *) &metric);
931 if (status != 0)
932 {
933 ERROR ("stats plugin: c_avl_remove (\"%s\") failed with status %i.",
934 to_be_deleted[i], status);
935 continue;
936 }
938 sfree (name);
939 statsd_metric_free (metric);
940 }
942 pthread_mutex_unlock (&metrics_lock);
944 strarray_free (to_be_deleted, to_be_deleted_num);
946 return (0);
947 } /* }}} int statsd_read */
949 static int statsd_shutdown (void) /* {{{ */
950 {
951 void *key;
952 void *value;
954 if (network_thread_running)
955 {
956 network_thread_shutdown = 1;
957 pthread_kill (network_thread, SIGTERM);
958 pthread_join (network_thread, /* retval = */ NULL);
959 }
960 network_thread_running = 0;
962 pthread_mutex_lock (&metrics_lock);
964 while (c_avl_pick (metrics_tree, &key, &value) == 0)
965 {
966 sfree (key);
967 statsd_metric_free (value);
968 }
969 c_avl_destroy (metrics_tree);
970 metrics_tree = NULL;
972 sfree (conf_node);
973 sfree (conf_service);
975 pthread_mutex_unlock (&metrics_lock);
977 return (0);
978 } /* }}} int statsd_shutdown */
980 void module_register (void)
981 {
982 plugin_register_complex_config ("statsd", statsd_config);
983 plugin_register_init ("statsd", statsd_init);
984 plugin_register_read ("statsd", statsd_read);
985 plugin_register_shutdown ("statsd", statsd_shutdown);
986 }
988 /* vim: set sw=2 sts=2 et fdm=marker : */