2 * collectd - src/write_graphite.c
3 * Copyright (C) 2012 Pierre-Yves Ritschard
4 * Copyright (C) 2011 Scott Sanders
5 * Copyright (C) 2009 Paul Sadauskas
6 * Copyright (C) 2009 Doug MacEachern
7 * Copyright (C) 2007-2013 Florian octo Forster
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; only version 2 of the License is applicable.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 * Florian octo Forster <octo at collectd.org>
24 * Doug MacEachern <dougm at hyperic.com>
25 * Paul Sadauskas <psadauskas at gmail.com>
26 * Scott Sanders <scott at jssjr.com>
27 * Pierre-Yves Ritschard <pyr at spootnik.org>
29 * Based on the write_http plugin.
32 /* write_graphite plugin configuation example
34 * <Plugin write_graphite>
48 #include "configfile.h"
50 #include "utils_cache.h"
51 #include "utils_complain.h"
52 #include "utils_format_graphite.h"
54 /* Folks without pthread will need to disable this plugin. */
57 #include <sys/socket.h>
60 #define WG_DEFAULT_NODE "localhost"
61 #define WG_DEFAULT_SERVICE "2003"
62 #define WG_DEFAULT_PROTOCOL "tcp"
63 #define WG_DEFAULT_LOG_SEND_ERRORS 1
64 #define WG_DEFAULT_ESCAPE '_'
66 /* Ethernet - (IPv6 + TCP) = 1500 - (40 + 32) = 1428 */
67 #define WG_SEND_BUF_SIZE 1428
69 #define WG_MIN_RECONNECT_INTERVAL TIME_T_TO_CDTIME_T (1)
83 _Bool log_send_errors;
88 unsigned int format_flags;
90 char send_buf[WG_SEND_BUF_SIZE];
93 cdtime_t send_buf_init_time;
95 pthread_mutex_t send_lock;
96 c_complain_t init_complaint;
97 cdtime_t last_connect_time;
104 static void wg_reset_buffer (struct wg_callback *cb)
106 memset (cb->send_buf, 0, sizeof (cb->send_buf));
107 cb->send_buf_free = sizeof (cb->send_buf);
108 cb->send_buf_fill = 0;
109 cb->send_buf_init_time = cdtime ();
112 static int wg_send_buffer (struct wg_callback *cb)
116 status = swrite (cb->sock_fd, cb->send_buf, strlen (cb->send_buf));
119 const char *protocol = cb->protocol ? cb->protocol : WG_DEFAULT_PROTOCOL;
121 if (cb->log_send_errors)
124 ERROR ("write_graphite plugin: send to %s:%s (%s) failed with status %zi (%s)",
125 cb->node, cb->service, protocol,
126 status, sstrerror (errno, errbuf, sizeof (errbuf)));
138 /* NOTE: You must hold cb->send_lock when calling this function! */
139 static int wg_flush_nolock (cdtime_t timeout, struct wg_callback *cb)
143 DEBUG ("write_graphite plugin: wg_flush_nolock: timeout = %.3f; "
144 "send_buf_fill = %zu;",
148 /* timeout == 0 => flush unconditionally */
154 if ((cb->send_buf_init_time + timeout) > now)
158 if (cb->send_buf_fill <= 0)
160 cb->send_buf_init_time = cdtime ();
164 status = wg_send_buffer (cb);
165 wg_reset_buffer (cb);
170 static int wg_callback_init (struct wg_callback *cb)
172 struct addrinfo ai_hints;
173 struct addrinfo *ai_list;
174 struct addrinfo *ai_ptr;
178 const char *node = cb->node ? cb->node : WG_DEFAULT_NODE;
179 const char *service = cb->service ? cb->service : WG_DEFAULT_SERVICE;
180 const char *protocol = cb->protocol ? cb->protocol : WG_DEFAULT_PROTOCOL;
182 char connerr[1024] = "";
187 /* Don't try to reconnect too often. By default, one reconnection attempt
188 * is made per second. */
190 if ((now - cb->last_connect_time) < WG_MIN_RECONNECT_INTERVAL)
192 cb->last_connect_time = now;
194 memset (&ai_hints, 0, sizeof (ai_hints));
196 ai_hints.ai_flags |= AI_ADDRCONFIG;
198 ai_hints.ai_family = AF_UNSPEC;
200 if (0 == strcasecmp ("tcp", protocol))
201 ai_hints.ai_socktype = SOCK_STREAM;
203 ai_hints.ai_socktype = SOCK_DGRAM;
207 status = getaddrinfo (node, service, &ai_hints, &ai_list);
210 ERROR ("write_graphite plugin: getaddrinfo (%s, %s, %s) failed: %s",
211 node, service, protocol, gai_strerror (status));
215 assert (ai_list != NULL);
216 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
218 cb->sock_fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
219 ai_ptr->ai_protocol);
220 if (cb->sock_fd < 0) {
222 snprintf (connerr, sizeof (connerr), "failed to open socket: %s",
223 sstrerror (errno, errbuf, sizeof (errbuf)));
227 status = connect (cb->sock_fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
231 snprintf (connerr, sizeof (connerr), "failed to connect to remote "
232 "host: %s", sstrerror (errno, errbuf, sizeof (errbuf)));
241 freeaddrinfo (ai_list);
245 if (connerr[0] == '\0')
246 /* this should not happen but try to get a message anyway */
247 sstrerror (errno, connerr, sizeof (connerr));
248 c_complain (LOG_ERR, &cb->init_complaint,
249 "write_graphite plugin: Connecting to %s:%s via %s failed. "
250 "The last error was: %s", node, service, protocol, connerr);
255 c_release (LOG_INFO, &cb->init_complaint,
256 "write_graphite plugin: Successfully connected to %s:%s via %s.",
257 node, service, protocol);
260 wg_reset_buffer (cb);
265 static void wg_callback_free (void *data)
267 struct wg_callback *cb;
274 pthread_mutex_lock (&cb->send_lock);
276 wg_flush_nolock (/* timeout = */ 0, cb);
278 if (cb->sock_fd >= 0)
291 pthread_mutex_destroy (&cb->send_lock);
296 static int wg_flush (cdtime_t timeout,
297 const char *identifier __attribute__((unused)),
298 user_data_t *user_data)
300 struct wg_callback *cb;
303 if (user_data == NULL)
306 cb = user_data->data;
308 pthread_mutex_lock (&cb->send_lock);
312 status = wg_callback_init (cb);
315 /* An error message has already been printed. */
316 pthread_mutex_unlock (&cb->send_lock);
321 status = wg_flush_nolock (timeout, cb);
322 pthread_mutex_unlock (&cb->send_lock);
327 static int wg_send_message (char const *message, struct wg_callback *cb)
332 message_len = strlen (message);
334 pthread_mutex_lock (&cb->send_lock);
338 status = wg_callback_init (cb);
341 /* An error message has already been printed. */
342 pthread_mutex_unlock (&cb->send_lock);
347 if (message_len >= cb->send_buf_free)
349 status = wg_flush_nolock (/* timeout = */ 0, cb);
352 pthread_mutex_unlock (&cb->send_lock);
357 /* Assert that we have enough space for this message. */
358 assert (message_len < cb->send_buf_free);
360 /* `message_len + 1' because `message_len' does not include the
361 * trailing null byte. Neither does `send_buffer_fill'. */
362 memcpy (cb->send_buf + cb->send_buf_fill,
363 message, message_len + 1);
364 cb->send_buf_fill += message_len;
365 cb->send_buf_free -= message_len;
367 DEBUG ("write_graphite plugin: [%s]:%s (%s) buf %zu/%zu (%.1f %%) \"%s\"",
371 cb->send_buf_fill, sizeof (cb->send_buf),
372 100.0 * ((double) cb->send_buf_fill) / ((double) sizeof (cb->send_buf)),
375 pthread_mutex_unlock (&cb->send_lock);
380 static int wg_write_messages (const data_set_t *ds, const value_list_t *vl,
381 struct wg_callback *cb)
383 char buffer[WG_SEND_BUF_SIZE];
386 if (0 != strcmp (ds->type, vl->type))
388 ERROR ("write_graphite plugin: DS type does not match "
393 memset (buffer, 0, sizeof (buffer));
394 status = format_graphite (buffer, sizeof (buffer), ds, vl,
395 cb->prefix, cb->postfix, cb->escape_char, cb->format_flags);
396 if (status != 0) /* error message has been printed already. */
399 /* Send the message to graphite */
400 status = wg_send_message (buffer, cb);
401 if (status != 0) /* error message has been printed already. */
405 } /* int wg_write_messages */
407 static int wg_write (const data_set_t *ds, const value_list_t *vl,
408 user_data_t *user_data)
410 struct wg_callback *cb;
413 if (user_data == NULL)
416 cb = user_data->data;
418 status = wg_write_messages (ds, vl, cb);
423 static int config_set_char (char *dest,
429 memset (buffer, 0, sizeof (buffer));
431 status = cf_util_get_string_buffer (ci, buffer, sizeof (buffer));
437 ERROR ("write_graphite plugin: Cannot use an empty string for the "
438 "\"EscapeCharacter\" option.");
444 WARNING ("write_graphite plugin: Only the first character of the "
445 "\"EscapeCharacter\" option ('%c') will be used.",
454 static int wg_config_node (oconfig_item_t *ci)
456 struct wg_callback *cb;
457 user_data_t user_data;
458 char callback_name[DATA_MAX_NAME_LEN];
462 cb = malloc (sizeof (*cb));
465 ERROR ("write_graphite plugin: malloc failed.");
468 memset (cb, 0, sizeof (*cb));
474 cb->log_send_errors = WG_DEFAULT_LOG_SEND_ERRORS;
477 cb->escape_char = WG_DEFAULT_ESCAPE;
478 cb->format_flags = GRAPHITE_STORE_RATES;
480 /* FIXME: Legacy configuration syntax. */
481 if (strcasecmp ("Carbon", ci->key) != 0)
483 status = cf_util_get_string (ci, &cb->name);
486 wg_callback_free (cb);
491 pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
492 C_COMPLAIN_INIT (&cb->init_complaint);
494 for (i = 0; i < ci->children_num; i++)
496 oconfig_item_t *child = ci->children + i;
498 if (strcasecmp ("Host", child->key) == 0)
499 cf_util_get_string (child, &cb->node);
500 else if (strcasecmp ("Port", child->key) == 0)
501 cf_util_get_service (child, &cb->service);
502 else if (strcasecmp ("Protocol", child->key) == 0)
504 cf_util_get_string (child, &cb->protocol);
506 if (strcasecmp ("UDP", cb->protocol) != 0 &&
507 strcasecmp ("TCP", cb->protocol) != 0)
509 ERROR ("write_graphite plugin: Unknown protocol (%s)",
514 else if (strcasecmp ("LogSendErrors", child->key) == 0)
515 cf_util_get_boolean (child, &cb->log_send_errors);
516 else if (strcasecmp ("Prefix", child->key) == 0)
517 cf_util_get_string (child, &cb->prefix);
518 else if (strcasecmp ("Postfix", child->key) == 0)
519 cf_util_get_string (child, &cb->postfix);
520 else if (strcasecmp ("StoreRates", child->key) == 0)
521 cf_util_get_flag (child, &cb->format_flags,
522 GRAPHITE_STORE_RATES);
523 else if (strcasecmp ("SeparateInstances", child->key) == 0)
524 cf_util_get_flag (child, &cb->format_flags,
525 GRAPHITE_SEPARATE_INSTANCES);
526 else if (strcasecmp ("AlwaysAppendDS", child->key) == 0)
527 cf_util_get_flag (child, &cb->format_flags,
528 GRAPHITE_ALWAYS_APPEND_DS);
529 else if (strcasecmp ("EscapeCharacter", child->key) == 0)
530 config_set_char (&cb->escape_char, child);
533 ERROR ("write_graphite plugin: Invalid configuration "
534 "option: %s.", child->key);
544 wg_callback_free (cb);
548 /* FIXME: Legacy configuration syntax. */
549 if (cb->name == NULL)
550 ssnprintf (callback_name, sizeof (callback_name), "write_graphite/%s/%s/%s",
551 cb->node != NULL ? cb->node : WG_DEFAULT_NODE,
552 cb->service != NULL ? cb->service : WG_DEFAULT_SERVICE,
553 cb->protocol != NULL ? cb->protocol : WG_DEFAULT_PROTOCOL);
555 ssnprintf (callback_name, sizeof (callback_name), "write_graphite/%s",
558 memset (&user_data, 0, sizeof (user_data));
560 user_data.free_func = wg_callback_free;
561 plugin_register_write (callback_name, wg_write, &user_data);
563 user_data.free_func = NULL;
564 plugin_register_flush (callback_name, wg_flush, &user_data);
569 static int wg_config (oconfig_item_t *ci)
573 for (i = 0; i < ci->children_num; i++)
575 oconfig_item_t *child = ci->children + i;
577 if (strcasecmp ("Node", child->key) == 0)
578 wg_config_node (child);
579 /* FIXME: Remove this legacy mode in version 6. */
580 else if (strcasecmp ("Carbon", child->key) == 0)
581 wg_config_node (child);
584 ERROR ("write_graphite plugin: Invalid configuration "
585 "option: %s.", child->key);
592 void module_register (void)
594 plugin_register_complex_config ("write_graphite", wg_config);
597 /* vim: set sw=4 ts=4 sts=4 tw=78 et : */