1 /**
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
8 *
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.
12 *
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.
17 *
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
21 *
22 * Authors:
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>
28 *
29 * Based on the write_http plugin.
30 **/
32 /* write_graphite plugin configuation example
33 *
34 * <Plugin write_graphite>
35 * <Carbon>
36 * Host "localhost"
37 * Port "2003"
38 * Protocol "udp"
39 * LogSendErrors true
40 * Prefix "collectd"
41 * </Carbon>
42 * </Plugin>
43 */
45 #include "collectd.h"
46 #include "common.h"
47 #include "plugin.h"
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. */
55 #include <pthread.h>
57 #include <netdb.h>
59 #define WG_DEFAULT_NODE "localhost"
60 #define WG_DEFAULT_SERVICE "2003"
61 #define WG_DEFAULT_PROTOCOL "tcp"
62 #define WG_DEFAULT_LOG_SEND_ERRORS 1
63 #define WG_DEFAULT_ESCAPE '_'
65 /* Ethernet - (IPv6 + TCP) = 1500 - (40 + 32) = 1428 */
66 #define WG_SEND_BUF_SIZE 1428
68 #define WG_MIN_RECONNECT_INTERVAL TIME_T_TO_CDTIME_T (1)
70 /*
71 * Private variables
72 */
73 struct wg_callback
74 {
75 int sock_fd;
77 char *name;
79 char *node;
80 char *service;
81 char *protocol;
82 _Bool log_send_errors;
83 char *prefix;
84 char *postfix;
85 char escape_char;
87 unsigned int format_flags;
89 char send_buf[WG_SEND_BUF_SIZE];
90 size_t send_buf_free;
91 size_t send_buf_fill;
92 cdtime_t send_buf_init_time;
94 pthread_mutex_t send_lock;
95 c_complain_t init_complaint;
96 cdtime_t last_connect_time;
98 /*Force reconnect useful for load balanced environments*/
99 cdtime_t last_force_reconnect_time;
100 int force_reconnect_timeout;
101 };
103 /*
104 * Force Reconnect functions
105 */
107 static void wg_force_reconnect_check(struct wg_callback *cb)
108 {
109 cdtime_t now;
110 if(!cb->force_reconnect_timeout) return;
111 //check if address changes if addr_timeout
112 now = cdtime ();
113 DEBUG("wg_force_reconnect_check: now %ld last: %ld ",CDTIME_T_TO_TIME_T(now),CDTIME_T_TO_TIME_T(cb->last_force_reconnect_time));
114 if ((now - cb->last_force_reconnect_time) < TIME_T_TO_CDTIME_T(cb->force_reconnect_timeout)){
115 return;
116 }
117 //here we should close connection on next
118 close (cb->sock_fd);
119 cb->sock_fd = -1;
120 INFO("Connection Forced closed after %ld seconds ",CDTIME_T_TO_TIME_T(now - cb->last_force_reconnect_time));
121 cb->last_force_reconnect_time = now;
122 }
126 /*
127 * Functions
128 */
129 static void wg_reset_buffer (struct wg_callback *cb)
130 {
131 memset (cb->send_buf, 0, sizeof (cb->send_buf));
132 cb->send_buf_free = sizeof (cb->send_buf);
133 cb->send_buf_fill = 0;
134 cb->send_buf_init_time = cdtime ();
135 }
137 static int wg_send_buffer (struct wg_callback *cb)
138 {
139 ssize_t status = 0;
141 status = swrite (cb->sock_fd, cb->send_buf, strlen (cb->send_buf));
142 if (status < 0)
143 {
144 if (cb->log_send_errors)
145 {
146 char errbuf[1024];
147 ERROR ("write_graphite plugin: send to %s:%s (%s) failed with status %zi (%s)",
148 cb->node, cb->service, cb->protocol,
149 status, sstrerror (errno, errbuf, sizeof (errbuf)));
150 }
152 close (cb->sock_fd);
153 cb->sock_fd = -1;
155 return (-1);
156 }
158 return (0);
159 }
161 /* NOTE: You must hold cb->send_lock when calling this function! */
162 static int wg_flush_nolock (cdtime_t timeout, struct wg_callback *cb)
163 {
164 int status;
166 DEBUG ("write_graphite plugin: wg_flush_nolock: timeout = %.3f; "
167 "send_buf_fill = %zu;",
168 (double)timeout,
169 cb->send_buf_fill);
171 /* timeout == 0 => flush unconditionally */
172 if (timeout > 0)
173 {
174 cdtime_t now;
176 now = cdtime ();
177 if ((cb->send_buf_init_time + timeout) > now)
178 return (0);
179 }
181 if (cb->send_buf_fill <= 0)
182 {
183 cb->send_buf_init_time = cdtime ();
184 return (0);
185 }
187 status = wg_send_buffer (cb);
188 wg_reset_buffer (cb);
190 return (status);
191 }
193 static int wg_callback_init (struct wg_callback *cb)
194 {
195 struct addrinfo ai_hints;
196 struct addrinfo *ai_list;
197 struct addrinfo *ai_ptr;
198 cdtime_t now;
199 int status;
201 char connerr[1024] = "";
203 if (cb->sock_fd > 0)
204 return (0);
206 /* Don't try to reconnect too often. By default, one reconnection attempt
207 * is made per second. */
208 now = cdtime ();
209 if ((now - cb->last_connect_time) < WG_MIN_RECONNECT_INTERVAL)
210 return (EAGAIN);
211 cb->last_connect_time = now;
213 memset (&ai_hints, 0, sizeof (ai_hints));
214 #ifdef AI_ADDRCONFIG
215 ai_hints.ai_flags |= AI_ADDRCONFIG;
216 #endif
217 ai_hints.ai_family = AF_UNSPEC;
219 if (0 == strcasecmp ("tcp", cb->protocol))
220 ai_hints.ai_socktype = SOCK_STREAM;
221 else
222 ai_hints.ai_socktype = SOCK_DGRAM;
224 ai_list = NULL;
226 status = getaddrinfo (cb->node, cb->service, &ai_hints, &ai_list);
227 if (status != 0)
228 {
229 ERROR ("write_graphite plugin: getaddrinfo (%s, %s, %s) failed: %s",
230 cb->node, cb->service, cb->protocol, gai_strerror (status));
231 return (-1);
232 }
234 assert (ai_list != NULL);
235 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
236 {
237 cb->sock_fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
238 ai_ptr->ai_protocol);
239 if (cb->sock_fd < 0) {
240 char errbuf[1024];
241 snprintf (connerr, sizeof (connerr), "failed to open socket: %s",
242 sstrerror (errno, errbuf, sizeof (errbuf)));
243 continue;
244 }
246 status = connect (cb->sock_fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
247 if (status != 0)
248 {
249 char errbuf[1024];
250 snprintf (connerr, sizeof (connerr), "failed to connect to remote "
251 "host: %s", sstrerror (errno, errbuf, sizeof (errbuf)));
252 close (cb->sock_fd);
253 cb->sock_fd = -1;
254 continue;
255 }
257 break;
258 }
260 freeaddrinfo (ai_list);
262 if (cb->sock_fd < 0)
263 {
264 if (connerr[0] == '\0')
265 /* this should not happen but try to get a message anyway */
266 sstrerror (errno, connerr, sizeof (connerr));
267 c_complain (LOG_ERR, &cb->init_complaint,
268 "write_graphite plugin: Connecting to %s:%s via %s failed. "
269 "The last error was: %s", cb->node, cb->service, cb->protocol, connerr);
270 return (-1);
271 }
272 else
273 {
274 c_release (LOG_INFO, &cb->init_complaint,
275 "write_graphite plugin: Successfully connected to %s:%s via %s.",
276 cb->node, cb->service, cb->protocol);
277 }
279 wg_reset_buffer (cb);
281 return (0);
282 }
284 static void wg_callback_free (void *data)
285 {
286 struct wg_callback *cb;
288 if (data == NULL)
289 return;
291 cb = data;
293 pthread_mutex_lock (&cb->send_lock);
295 wg_flush_nolock (/* timeout = */ 0, cb);
297 if (cb->sock_fd >= 0)
298 {
299 close (cb->sock_fd);
300 cb->sock_fd = -1;
301 }
303 sfree(cb->name);
304 sfree(cb->node);
305 sfree(cb->protocol);
306 sfree(cb->service);
307 sfree(cb->prefix);
308 sfree(cb->postfix);
310 pthread_mutex_destroy (&cb->send_lock);
312 sfree(cb);
313 }
315 static int wg_flush (cdtime_t timeout,
316 const char *identifier __attribute__((unused)),
317 user_data_t *user_data)
318 {
319 struct wg_callback *cb;
320 int status;
322 if (user_data == NULL)
323 return (-EINVAL);
325 cb = user_data->data;
327 pthread_mutex_lock (&cb->send_lock);
329 if (cb->sock_fd < 0)
330 {
331 status = wg_callback_init (cb);
332 if (status != 0)
333 {
334 /* An error message has already been printed. */
335 pthread_mutex_unlock (&cb->send_lock);
336 return (-1);
337 }
338 }
340 status = wg_flush_nolock (timeout, cb);
341 pthread_mutex_unlock (&cb->send_lock);
343 return (status);
344 }
346 static int wg_send_message (char const *message, struct wg_callback *cb)
347 {
348 int status;
349 size_t message_len;
351 message_len = strlen (message);
353 pthread_mutex_lock (&cb->send_lock);
355 wg_force_reconnect_check(cb);
357 if (cb->sock_fd < 0)
358 {
359 status = wg_callback_init (cb);
360 if (status != 0)
361 {
362 /* An error message has already been printed. */
363 pthread_mutex_unlock (&cb->send_lock);
364 return (-1);
365 }
366 }
368 if (message_len >= cb->send_buf_free)
369 {
370 status = wg_flush_nolock (/* timeout = */ 0, cb);
371 if (status != 0)
372 {
373 pthread_mutex_unlock (&cb->send_lock);
374 return (status);
375 }
376 }
378 /* Assert that we have enough space for this message. */
379 assert (message_len < cb->send_buf_free);
381 /* `message_len + 1' because `message_len' does not include the
382 * trailing null byte. Neither does `send_buffer_fill'. */
383 memcpy (cb->send_buf + cb->send_buf_fill,
384 message, message_len + 1);
385 cb->send_buf_fill += message_len;
386 cb->send_buf_free -= message_len;
388 DEBUG ("write_graphite plugin: [%s]:%s (%s) buf %zu/%zu (%.1f %%) \"%s\"",
389 cb->node, cb->service, cb->protocol,
390 cb->send_buf_fill, sizeof (cb->send_buf),
391 100.0 * ((double) cb->send_buf_fill) / ((double) sizeof (cb->send_buf)),
392 message);
394 pthread_mutex_unlock (&cb->send_lock);
396 return (0);
397 }
399 static int wg_write_messages (const data_set_t *ds, const value_list_t *vl,
400 struct wg_callback *cb)
401 {
402 char buffer[WG_SEND_BUF_SIZE];
403 int status;
405 if (0 != strcmp (ds->type, vl->type))
406 {
407 ERROR ("write_graphite plugin: DS type does not match "
408 "value list type");
409 return -1;
410 }
412 memset (buffer, 0, sizeof (buffer));
413 status = format_graphite (buffer, sizeof (buffer), ds, vl,
414 cb->prefix, cb->postfix, cb->escape_char, cb->format_flags);
415 if (status != 0) /* error message has been printed already. */
416 return (status);
418 /* Send the message to graphite */
419 status = wg_send_message (buffer, cb);
420 if (status != 0) /* error message has been printed already. */
421 return (status);
423 return (0);
424 } /* int wg_write_messages */
426 static int wg_write (const data_set_t *ds, const value_list_t *vl,
427 user_data_t *user_data)
428 {
429 struct wg_callback *cb;
430 int status;
432 if (user_data == NULL)
433 return (EINVAL);
435 cb = user_data->data;
437 status = wg_write_messages (ds, vl, cb);
439 return (status);
440 }
442 static int config_set_char (char *dest,
443 oconfig_item_t *ci)
444 {
445 char buffer[4];
446 int status;
448 memset (buffer, 0, sizeof (buffer));
450 status = cf_util_get_string_buffer (ci, buffer, sizeof (buffer));
451 if (status != 0)
452 return (status);
454 if (buffer[0] == 0)
455 {
456 ERROR ("write_graphite plugin: Cannot use an empty string for the "
457 "\"EscapeCharacter\" option.");
458 return (-1);
459 }
461 if (buffer[1] != 0)
462 {
463 WARNING ("write_graphite plugin: Only the first character of the "
464 "\"EscapeCharacter\" option ('%c') will be used.",
465 (int) buffer[0]);
466 }
468 *dest = buffer[0];
470 return (0);
471 }
473 static int wg_config_node (oconfig_item_t *ci)
474 {
475 struct wg_callback *cb;
476 user_data_t user_data;
477 char callback_name[DATA_MAX_NAME_LEN];
478 int i;
479 int status = 0;
481 cb = malloc (sizeof (*cb));
482 if (cb == NULL)
483 {
484 ERROR ("write_graphite plugin: malloc failed.");
485 return (-1);
486 }
487 memset (cb, 0, sizeof (*cb));
488 cb->sock_fd = -1;
489 cb->name = NULL;
490 cb->node = strdup (WG_DEFAULT_NODE);
491 cb->service = strdup (WG_DEFAULT_SERVICE);
492 cb->protocol = strdup (WG_DEFAULT_PROTOCOL);
493 cb->last_force_reconnect_time=cdtime();
494 cb->force_reconnect_timeout=0;
495 cb->log_send_errors = WG_DEFAULT_LOG_SEND_ERRORS;
496 cb->prefix = NULL;
497 cb->postfix = NULL;
498 cb->escape_char = WG_DEFAULT_ESCAPE;
499 cb->format_flags = GRAPHITE_STORE_RATES;
501 /* FIXME: Legacy configuration syntax. */
502 if (strcasecmp ("Carbon", ci->key) != 0)
503 {
504 status = cf_util_get_string (ci, &cb->name);
505 if (status != 0)
506 {
507 wg_callback_free (cb);
508 return (status);
509 }
510 }
512 pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
513 C_COMPLAIN_INIT (&cb->init_complaint);
515 for (i = 0; i < ci->children_num; i++)
516 {
517 oconfig_item_t *child = ci->children + i;
519 if (strcasecmp ("Host", child->key) == 0)
520 cf_util_get_string (child, &cb->node);
521 else if (strcasecmp ("Port", child->key) == 0)
522 cf_util_get_service (child, &cb->service);
523 else if (strcasecmp ("Protocol", child->key) == 0)
524 {
525 cf_util_get_string (child, &cb->protocol);
527 if (strcasecmp ("UDP", cb->protocol) != 0 &&
528 strcasecmp ("TCP", cb->protocol) != 0)
529 {
530 ERROR ("write_graphite plugin: Unknown protocol (%s)",
531 cb->protocol);
532 status = -1;
533 }
534 }
535 else if (strcasecmp ("ForceReconnectTimeout", child->key) == 0)
536 cf_util_get_int (child,&cb->force_reconnect_timeout);
537 else if (strcasecmp ("LogSendErrors", child->key) == 0)
538 cf_util_get_boolean (child, &cb->log_send_errors);
539 else if (strcasecmp ("Prefix", child->key) == 0)
540 cf_util_get_string (child, &cb->prefix);
541 else if (strcasecmp ("Postfix", child->key) == 0)
542 cf_util_get_string (child, &cb->postfix);
543 else if (strcasecmp ("StoreRates", child->key) == 0)
544 cf_util_get_flag (child, &cb->format_flags,
545 GRAPHITE_STORE_RATES);
546 else if (strcasecmp ("SeparateInstances", child->key) == 0)
547 cf_util_get_flag (child, &cb->format_flags,
548 GRAPHITE_SEPARATE_INSTANCES);
549 else if (strcasecmp ("AlwaysAppendDS", child->key) == 0)
550 cf_util_get_flag (child, &cb->format_flags,
551 GRAPHITE_ALWAYS_APPEND_DS);
552 else if (strcasecmp ("EscapeCharacter", child->key) == 0)
553 config_set_char (&cb->escape_char, child);
554 else
555 {
556 ERROR ("write_graphite plugin: Invalid configuration "
557 "option: %s.", child->key);
558 status = -1;
559 }
561 if (status != 0)
562 break;
563 }
565 if (status != 0)
566 {
567 wg_callback_free (cb);
568 return (status);
569 }
571 /* FIXME: Legacy configuration syntax. */
572 if (cb->name == NULL)
573 ssnprintf (callback_name, sizeof (callback_name), "write_graphite/%s/%s/%s",
574 cb->node, cb->service, cb->protocol);
575 else
576 ssnprintf (callback_name, sizeof (callback_name), "write_graphite/%s",
577 cb->name);
579 memset (&user_data, 0, sizeof (user_data));
580 user_data.data = cb;
581 user_data.free_func = wg_callback_free;
582 plugin_register_write (callback_name, wg_write, &user_data);
584 user_data.free_func = NULL;
585 plugin_register_flush (callback_name, wg_flush, &user_data);
587 return (0);
588 }
590 static int wg_config (oconfig_item_t *ci)
591 {
592 int i;
594 for (i = 0; i < ci->children_num; i++)
595 {
596 oconfig_item_t *child = ci->children + i;
598 if (strcasecmp ("Node", child->key) == 0)
599 wg_config_node (child);
600 /* FIXME: Remove this legacy mode in version 6. */
601 else if (strcasecmp ("Carbon", child->key) == 0)
602 wg_config_node (child);
603 else
604 {
605 ERROR ("write_graphite plugin: Invalid configuration "
606 "option: %s.", child->key);
607 }
608 }
610 return (0);
611 }
613 void module_register (void)
614 {
615 plugin_register_complex_config ("write_graphite", wg_config);
616 }
618 /* vim: set sw=4 ts=4 sts=4 tw=78 et : */