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_parse_option.h"
53 #include "utils_format_graphite.h"
55 /* Folks without pthread will need to disable this plugin. */
56 #include <pthread.h>
58 #include <sys/socket.h>
59 #include <netdb.h>
61 #ifndef WG_DEFAULT_NODE
62 # define WG_DEFAULT_NODE "localhost"
63 #endif
65 #ifndef WG_DEFAULT_SERVICE
66 # define WG_DEFAULT_SERVICE "2003"
67 #endif
69 #ifndef WG_DEFAULT_PROTOCOL
70 # define WG_DEFAULT_PROTOCOL "tcp"
71 #endif
73 #ifndef WG_DEFAULT_LOG_SEND_ERRORS
74 # define WG_DEFAULT_LOG_SEND_ERRORS 1
75 #endif
77 #ifndef WG_DEFAULT_ESCAPE
78 # define WG_DEFAULT_ESCAPE '_'
79 #endif
81 /* Ethernet - (IPv6 + TCP) = 1500 - (40 + 32) = 1428 */
82 #ifndef WG_SEND_BUF_SIZE
83 # define WG_SEND_BUF_SIZE 1428
84 #endif
86 /*
87 * Private variables
88 */
89 struct wg_callback
90 {
91 int sock_fd;
93 char *name;
95 char *node;
96 char *service;
97 char *protocol;
98 _Bool log_send_errors;
99 char *prefix;
100 char *postfix;
101 char escape_char;
103 unsigned int format_flags;
105 char send_buf[WG_SEND_BUF_SIZE];
106 size_t send_buf_free;
107 size_t send_buf_fill;
108 cdtime_t send_buf_init_time;
110 pthread_mutex_t send_lock;
111 c_complain_t init_complaint;
112 };
115 /*
116 * Functions
117 */
118 static void wg_reset_buffer (struct wg_callback *cb)
119 {
120 memset (cb->send_buf, 0, sizeof (cb->send_buf));
121 cb->send_buf_free = sizeof (cb->send_buf);
122 cb->send_buf_fill = 0;
123 cb->send_buf_init_time = cdtime ();
124 }
126 static int wg_send_buffer (struct wg_callback *cb)
127 {
128 ssize_t status = 0;
130 status = swrite (cb->sock_fd, cb->send_buf, strlen (cb->send_buf));
131 if (status < 0)
132 {
133 const char *protocol = cb->protocol ? cb->protocol : WG_DEFAULT_PROTOCOL;
135 if (cb->log_send_errors)
136 {
137 char errbuf[1024];
138 ERROR ("write_graphite plugin: send to %s:%s (%s) failed with status %zi (%s)",
139 cb->node, cb->service, protocol,
140 status, sstrerror (errno, errbuf, sizeof (errbuf)));
141 }
143 close (cb->sock_fd);
144 cb->sock_fd = -1;
146 return (-1);
147 }
149 return (0);
150 }
152 /* NOTE: You must hold cb->send_lock when calling this function! */
153 static int wg_flush_nolock (cdtime_t timeout, struct wg_callback *cb)
154 {
155 int status;
157 DEBUG ("write_graphite plugin: wg_flush_nolock: timeout = %.3f; "
158 "send_buf_fill = %zu;",
159 (double)timeout,
160 cb->send_buf_fill);
162 /* timeout == 0 => flush unconditionally */
163 if (timeout > 0)
164 {
165 cdtime_t now;
167 now = cdtime ();
168 if ((cb->send_buf_init_time + timeout) > now)
169 return (0);
170 }
172 if (cb->send_buf_fill <= 0)
173 {
174 cb->send_buf_init_time = cdtime ();
175 return (0);
176 }
178 status = wg_send_buffer (cb);
179 wg_reset_buffer (cb);
181 return (status);
182 }
184 static int wg_callback_init (struct wg_callback *cb)
185 {
186 struct addrinfo ai_hints;
187 struct addrinfo *ai_list;
188 struct addrinfo *ai_ptr;
189 int status;
191 const char *node = cb->node ? cb->node : WG_DEFAULT_NODE;
192 const char *service = cb->service ? cb->service : WG_DEFAULT_SERVICE;
193 const char *protocol = cb->protocol ? cb->protocol : WG_DEFAULT_PROTOCOL;
195 if (cb->sock_fd > 0)
196 return (0);
198 memset (&ai_hints, 0, sizeof (ai_hints));
199 #ifdef AI_ADDRCONFIG
200 ai_hints.ai_flags |= AI_ADDRCONFIG;
201 #endif
202 ai_hints.ai_family = AF_UNSPEC;
204 if (0 == strcasecmp ("tcp", protocol))
205 ai_hints.ai_socktype = SOCK_STREAM;
206 else
207 ai_hints.ai_socktype = SOCK_DGRAM;
209 ai_list = NULL;
211 status = getaddrinfo (node, service, &ai_hints, &ai_list);
212 if (status != 0)
213 {
214 ERROR ("write_graphite plugin: getaddrinfo (%s, %s, %s) failed: %s",
215 node, service, protocol, gai_strerror (status));
216 return (-1);
217 }
219 assert (ai_list != NULL);
220 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
221 {
222 cb->sock_fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
223 ai_ptr->ai_protocol);
224 if (cb->sock_fd < 0)
225 continue;
227 status = connect (cb->sock_fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
228 if (status != 0)
229 {
230 close (cb->sock_fd);
231 cb->sock_fd = -1;
232 continue;
233 }
235 break;
236 }
238 freeaddrinfo (ai_list);
240 if (cb->sock_fd < 0)
241 {
242 char errbuf[1024];
243 c_complain (LOG_ERR, &cb->init_complaint,
244 "write_graphite plugin: Connecting to %s:%s via %s failed. "
245 "The last error was: %s", node, service, protocol,
246 sstrerror (errno, errbuf, sizeof (errbuf)));
247 return (-1);
248 }
249 else
250 {
251 c_release (LOG_INFO, &cb->init_complaint,
252 "write_graphite plugin: Successfully connected to %s:%s via %s.",
253 node, service, protocol);
254 }
256 wg_reset_buffer (cb);
258 return (0);
259 }
261 static void wg_callback_free (void *data)
262 {
263 struct wg_callback *cb;
265 if (data == NULL)
266 return;
268 cb = data;
270 pthread_mutex_lock (&cb->send_lock);
272 wg_flush_nolock (/* timeout = */ 0, cb);
274 if (cb->sock_fd >= 0)
275 {
276 close (cb->sock_fd);
277 cb->sock_fd = -1;
278 }
280 sfree(cb->name);
281 sfree(cb->node);
282 sfree(cb->protocol);
283 sfree(cb->service);
284 sfree(cb->prefix);
285 sfree(cb->postfix);
287 pthread_mutex_destroy (&cb->send_lock);
289 sfree(cb);
290 }
292 static int wg_flush (cdtime_t timeout,
293 const char *identifier __attribute__((unused)),
294 user_data_t *user_data)
295 {
296 struct wg_callback *cb;
297 int status;
299 if (user_data == NULL)
300 return (-EINVAL);
302 cb = user_data->data;
304 pthread_mutex_lock (&cb->send_lock);
306 if (cb->sock_fd < 0)
307 {
308 status = wg_callback_init (cb);
309 if (status != 0)
310 {
311 /* An error message has already been printed. */
312 pthread_mutex_unlock (&cb->send_lock);
313 return (-1);
314 }
315 }
317 status = wg_flush_nolock (timeout, cb);
318 pthread_mutex_unlock (&cb->send_lock);
320 return (status);
321 }
323 static int wg_send_message (char const *message, struct wg_callback *cb)
324 {
325 int status;
326 size_t message_len;
328 message_len = strlen (message);
330 pthread_mutex_lock (&cb->send_lock);
332 if (cb->sock_fd < 0)
333 {
334 status = wg_callback_init (cb);
335 if (status != 0)
336 {
337 /* An error message has already been printed. */
338 pthread_mutex_unlock (&cb->send_lock);
339 return (-1);
340 }
341 }
343 if (message_len >= cb->send_buf_free)
344 {
345 status = wg_flush_nolock (/* timeout = */ 0, cb);
346 if (status != 0)
347 {
348 pthread_mutex_unlock (&cb->send_lock);
349 return (status);
350 }
351 }
353 /* Assert that we have enough space for this message. */
354 assert (message_len < cb->send_buf_free);
356 /* `message_len + 1' because `message_len' does not include the
357 * trailing null byte. Neither does `send_buffer_fill'. */
358 memcpy (cb->send_buf + cb->send_buf_fill,
359 message, message_len + 1);
360 cb->send_buf_fill += message_len;
361 cb->send_buf_free -= message_len;
363 DEBUG ("write_graphite plugin: [%s]:%s (%s) buf %zu/%zu (%.1f %%) \"%s\"",
364 cb->node,
365 cb->service,
366 cb->protocol,
367 cb->send_buf_fill, sizeof (cb->send_buf),
368 100.0 * ((double) cb->send_buf_fill) / ((double) sizeof (cb->send_buf)),
369 message);
371 pthread_mutex_unlock (&cb->send_lock);
373 return (0);
374 }
376 static int wg_write_messages (const data_set_t *ds, const value_list_t *vl,
377 struct wg_callback *cb)
378 {
379 char buffer[WG_SEND_BUF_SIZE];
380 int status;
382 if (0 != strcmp (ds->type, vl->type))
383 {
384 ERROR ("write_graphite plugin: DS type does not match "
385 "value list type");
386 return -1;
387 }
389 memset (buffer, 0, sizeof (buffer));
390 status = format_graphite (buffer, sizeof (buffer), ds, vl,
391 cb->prefix, cb->postfix, cb->escape_char, cb->format_flags);
392 if (status != 0) /* error message has been printed already. */
393 return (status);
395 /* Send the message to graphite */
396 status = wg_send_message (buffer, cb);
397 if (status != 0) /* error message has been printed already. */
398 return (status);
400 return (0);
401 } /* int wg_write_messages */
403 static int wg_write (const data_set_t *ds, const value_list_t *vl,
404 user_data_t *user_data)
405 {
406 struct wg_callback *cb;
407 int status;
409 if (user_data == NULL)
410 return (EINVAL);
412 cb = user_data->data;
414 status = wg_write_messages (ds, vl, cb);
416 return (status);
417 }
419 static int config_set_char (char *dest,
420 oconfig_item_t *ci)
421 {
422 char buffer[4];
423 int status;
425 memset (buffer, 0, sizeof (buffer));
427 status = cf_util_get_string_buffer (ci, buffer, sizeof (buffer));
428 if (status != 0)
429 return (status);
431 if (buffer[0] == 0)
432 {
433 ERROR ("write_graphite plugin: Cannot use an empty string for the "
434 "\"EscapeCharacter\" option.");
435 return (-1);
436 }
438 if (buffer[1] != 0)
439 {
440 WARNING ("write_graphite plugin: Only the first character of the "
441 "\"EscapeCharacter\" option ('%c') will be used.",
442 (int) buffer[0]);
443 }
445 *dest = buffer[0];
447 return (0);
448 }
450 static int wg_config_node (oconfig_item_t *ci)
451 {
452 struct wg_callback *cb;
453 user_data_t user_data;
454 char callback_name[DATA_MAX_NAME_LEN];
455 int i;
456 int status = 0;
458 cb = malloc (sizeof (*cb));
459 if (cb == NULL)
460 {
461 ERROR ("write_graphite plugin: malloc failed.");
462 return (-1);
463 }
464 memset (cb, 0, sizeof (*cb));
465 cb->sock_fd = -1;
466 cb->name = NULL;
467 cb->node = NULL;
468 cb->service = NULL;
469 cb->protocol = NULL;
470 cb->log_send_errors = WG_DEFAULT_LOG_SEND_ERRORS;
471 cb->prefix = NULL;
472 cb->postfix = NULL;
473 cb->escape_char = WG_DEFAULT_ESCAPE;
474 cb->format_flags = GRAPHITE_STORE_RATES;
476 /* FIXME: Legacy configuration syntax. */
477 if (strcasecmp ("Carbon", ci->key) != 0)
478 {
479 status = cf_util_get_string (ci, &cb->name);
480 if (status != 0)
481 {
482 wg_callback_free (cb);
483 return (status);
484 }
485 }
487 pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
488 C_COMPLAIN_INIT (&cb->init_complaint);
490 for (i = 0; i < ci->children_num; i++)
491 {
492 oconfig_item_t *child = ci->children + i;
494 if (strcasecmp ("Host", child->key) == 0)
495 cf_util_get_string (child, &cb->node);
496 else if (strcasecmp ("Port", child->key) == 0)
497 cf_util_get_service (child, &cb->service);
498 else if (strcasecmp ("Protocol", child->key) == 0)
499 {
500 cf_util_get_string (child, &cb->protocol);
502 if (strcasecmp ("UDP", cb->protocol) != 0 &&
503 strcasecmp ("TCP", cb->protocol) != 0)
504 {
505 ERROR ("write_graphite plugin: Unknown protocol (%s)",
506 cb->protocol);
507 status = -1;
508 }
509 }
510 else if (strcasecmp ("LogSendErrors", child->key) == 0)
511 cf_util_get_boolean (child, &cb->log_send_errors);
512 else if (strcasecmp ("Prefix", child->key) == 0)
513 cf_util_get_string (child, &cb->prefix);
514 else if (strcasecmp ("Postfix", child->key) == 0)
515 cf_util_get_string (child, &cb->postfix);
516 else if (strcasecmp ("StoreRates", child->key) == 0)
517 cf_util_get_flag (child, &cb->format_flags,
518 GRAPHITE_STORE_RATES);
519 else if (strcasecmp ("SeparateInstances", child->key) == 0)
520 cf_util_get_flag (child, &cb->format_flags,
521 GRAPHITE_SEPARATE_INSTANCES);
522 else if (strcasecmp ("AlwaysAppendDS", child->key) == 0)
523 cf_util_get_flag (child, &cb->format_flags,
524 GRAPHITE_ALWAYS_APPEND_DS);
525 else if (strcasecmp ("EscapeCharacter", child->key) == 0)
526 config_set_char (&cb->escape_char, child);
527 else
528 {
529 ERROR ("write_graphite plugin: Invalid configuration "
530 "option: %s.", child->key);
531 status = -1;
532 }
534 if (status != 0)
535 break;
536 }
538 if (status != 0)
539 {
540 wg_callback_free (cb);
541 return (status);
542 }
544 /* FIXME: Legacy configuration syntax. */
545 if (cb->name == NULL)
546 ssnprintf (callback_name, sizeof (callback_name), "write_graphite/%s/%s/%s",
547 cb->node != NULL ? cb->node : WG_DEFAULT_NODE,
548 cb->service != NULL ? cb->service : WG_DEFAULT_SERVICE,
549 cb->protocol != NULL ? cb->protocol : WG_DEFAULT_PROTOCOL);
550 else
551 ssnprintf (callback_name, sizeof (callback_name), "write_graphite/%s",
552 cb->name);
554 memset (&user_data, 0, sizeof (user_data));
555 user_data.data = cb;
556 user_data.free_func = wg_callback_free;
557 plugin_register_write (callback_name, wg_write, &user_data);
559 user_data.free_func = NULL;
560 plugin_register_flush (callback_name, wg_flush, &user_data);
562 return (0);
563 }
565 static int wg_config (oconfig_item_t *ci)
566 {
567 int i;
569 for (i = 0; i < ci->children_num; i++)
570 {
571 oconfig_item_t *child = ci->children + i;
573 if (strcasecmp ("Node", child->key) == 0)
574 wg_config_node (child);
575 /* FIXME: Remove this legacy mode in version 6. */
576 else if (strcasecmp ("Carbon", child->key) == 0)
577 wg_config_node (child);
578 else
579 {
580 ERROR ("write_graphite plugin: Invalid configuration "
581 "option: %s.", child->key);
582 }
583 }
585 return (0);
586 }
588 void module_register (void)
589 {
590 plugin_register_complex_config ("write_graphite", wg_config);
591 }
593 /* vim: set sw=4 ts=4 sts=4 tw=78 et : */