de460d7cfc0ba39e94ba4ae94fad4e45b25d34de
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) 2007-2012 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 * Prefix "collectd"
39 * </Carbon>
40 * </Plugin>
41 */
43 #include "collectd.h"
44 #include "common.h"
45 #include "plugin.h"
46 #include "configfile.h"
48 #include "utils_cache.h"
49 #include "utils_parse_option.h"
51 /* Folks without pthread will need to disable this plugin. */
52 #include <pthread.h>
54 #include <sys/socket.h>
55 #include <netdb.h>
57 #ifndef WG_FORMAT_NAME
58 #define WG_FORMAT_NAME(ret, ret_len, vl, cb, ds_name) \
59 wg_format_name (ret, ret_len, (vl)->host, \
60 (vl)->plugin, (vl)->plugin_instance, \
61 (vl)->type, (vl)->type_instance, \
62 (cb)->prefix, (cb)->postfix, \
63 ds_name, (cb)->escape_char)
64 #endif
66 #ifndef WG_DEFAULT_NODE
67 # define WG_DEFAULT_NODE "localhost"
68 #endif
70 #ifndef WG_DEFAULT_SERVICE
71 # define WG_DEFAULT_SERVICE "2003"
72 #endif
74 #ifndef WG_SEND_BUF_SIZE
75 # define WG_SEND_BUF_SIZE 4096
76 #endif
78 /*
79 * Private variables
80 */
81 struct wg_callback
82 {
83 int sock_fd;
85 char *node;
86 char *service;
87 char *prefix;
88 char *postfix;
89 char escape_char;
91 char send_buf[WG_SEND_BUF_SIZE];
92 size_t send_buf_free;
93 size_t send_buf_fill;
94 cdtime_t send_buf_init_time;
96 pthread_mutex_t send_lock;
97 };
100 /*
101 * Functions
102 */
103 static void wg_reset_buffer (struct wg_callback *cb)
104 {
105 memset (cb->send_buf, 0, sizeof (cb->send_buf));
106 cb->send_buf_free = sizeof (cb->send_buf);
107 cb->send_buf_fill = 0;
108 cb->send_buf_init_time = cdtime ();
109 }
111 static int wg_send_buffer (struct wg_callback *cb)
112 {
113 int status = 0;
115 status = write (cb->sock_fd, cb->send_buf, strlen (cb->send_buf));
116 if (status < 0)
117 {
118 ERROR ("write_graphite plugin: send failed with "
119 "status %i (%s)",
120 status,
121 strerror (errno));
123 pthread_mutex_trylock (&cb->send_lock);
125 DEBUG ("write_graphite plugin: closing socket and restting fd "
126 "so reinit will occur");
127 close (cb->sock_fd);
128 cb->sock_fd = -1;
130 pthread_mutex_unlock (&cb->send_lock);
132 return (-1);
133 }
134 return (0);
135 }
137 static int wg_flush_nolock (cdtime_t timeout, struct wg_callback *cb)
138 {
139 int status;
141 DEBUG ("write_graphite plugin: wg_flush_nolock: timeout = %.3f; "
142 "send_buf_fill = %zu;",
143 (double)timeout,
144 cb->send_buf_fill);
146 /* timeout == 0 => flush unconditionally */
147 if (timeout > 0)
148 {
149 cdtime_t now;
151 now = cdtime ();
152 if ((cb->send_buf_init_time + timeout) > now)
153 return (0);
154 }
156 if (cb->send_buf_fill <= 0)
157 {
158 cb->send_buf_init_time = cdtime ();
159 return (0);
160 }
162 status = wg_send_buffer (cb);
163 wg_reset_buffer (cb);
165 return (status);
166 }
168 static int wg_callback_init (struct wg_callback *cb)
169 {
170 struct addrinfo ai_hints;
171 struct addrinfo *ai_list;
172 struct addrinfo *ai_ptr;
173 int status;
175 const char *node = cb->node ? cb->node : WG_DEFAULT_NODE;
176 const char *service = cb->service ? cb->service : WG_DEFAULT_SERVICE;
178 if (cb->sock_fd > 0)
179 return (0);
181 memset (&ai_hints, 0, sizeof (ai_hints));
182 #ifdef AI_ADDRCONFIG
183 ai_hints.ai_flags |= AI_ADDRCONFIG;
184 #endif
185 ai_hints.ai_family = AF_UNSPEC;
186 ai_hints.ai_socktype = SOCK_STREAM;
188 ai_list = NULL;
190 status = getaddrinfo (node, service, &ai_hints, &ai_list);
191 if (status != 0)
192 {
193 ERROR ("write_graphite plugin: getaddrinfo (%s, %s) failed: %s",
194 node, service, gai_strerror (status));
195 return (-1);
196 }
198 assert (ai_list != NULL);
199 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
200 {
201 cb->sock_fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
202 ai_ptr->ai_protocol);
203 if (cb->sock_fd < 0)
204 continue;
206 status = connect (cb->sock_fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
207 if (status != 0)
208 {
209 close (cb->sock_fd);
210 cb->sock_fd = -1;
211 continue;
212 }
214 break;
215 }
217 freeaddrinfo (ai_list);
219 if (cb->sock_fd < 0)
220 {
221 char errbuf[1024];
222 ERROR ("write_graphite plugin: Connecting to %s:%s failed. "
223 "The last error was: %s", node, service,
224 sstrerror (errno, errbuf, sizeof (errbuf)));
225 close (cb->sock_fd);
226 return (-1);
227 }
229 wg_reset_buffer (cb);
231 return (0);
232 }
234 static void wg_callback_free (void *data)
235 {
236 struct wg_callback *cb;
238 if (data == NULL)
239 return;
241 cb = data;
243 wg_flush_nolock (/* timeout = */ 0, cb);
245 close(cb->sock_fd);
246 sfree(cb->node);
247 sfree(cb->service);
248 sfree(cb->prefix);
249 sfree(cb->postfix);
251 sfree(cb);
252 }
254 static int wg_flush (cdtime_t timeout,
255 const char *identifier __attribute__((unused)),
256 user_data_t *user_data)
257 {
258 struct wg_callback *cb;
259 int status;
261 if (user_data == NULL)
262 return (-EINVAL);
264 cb = user_data->data;
266 pthread_mutex_lock (&cb->send_lock);
268 if (cb->sock_fd < 0)
269 {
270 status = wg_callback_init (cb);
271 if (status != 0)
272 {
273 ERROR ("write_graphite plugin: wg_callback_init failed.");
274 pthread_mutex_unlock (&cb->send_lock);
275 return (-1);
276 }
277 }
279 status = wg_flush_nolock (timeout, cb);
280 pthread_mutex_unlock (&cb->send_lock);
282 return (status);
283 }
285 static int wg_format_values (char *ret, size_t ret_len,
286 int ds_num, const data_set_t *ds, const value_list_t *vl,
287 _Bool store_rates)
288 {
289 size_t offset = 0;
290 int status;
291 gauge_t *rates = NULL;
293 assert (0 == strcmp (ds->type, vl->type));
295 memset (ret, 0, ret_len);
297 #define BUFFER_ADD(...) do { \
298 status = ssnprintf (ret + offset, ret_len - offset, \
299 __VA_ARGS__); \
300 if (status < 1) \
301 { \
302 sfree (rates); \
303 return (-1); \
304 } \
305 else if (((size_t) status) >= (ret_len - offset)) \
306 { \
307 sfree (rates); \
308 return (-1); \
309 } \
310 else \
311 offset += ((size_t) status); \
312 } while (0)
314 if (ds->ds[ds_num].type == DS_TYPE_GAUGE)
315 BUFFER_ADD ("%f", vl->values[ds_num].gauge);
316 else if (store_rates)
317 {
318 if (rates == NULL)
319 rates = uc_get_rate (ds, vl);
320 if (rates == NULL)
321 {
322 WARNING ("format_values: "
323 "uc_get_rate failed.");
324 return (-1);
325 }
326 BUFFER_ADD ("%g", rates[ds_num]);
327 }
328 else if (ds->ds[ds_num].type == DS_TYPE_COUNTER)
329 BUFFER_ADD ("%llu", vl->values[ds_num].counter);
330 else if (ds->ds[ds_num].type == DS_TYPE_DERIVE)
331 BUFFER_ADD ("%"PRIi64, vl->values[ds_num].derive);
332 else if (ds->ds[ds_num].type == DS_TYPE_ABSOLUTE)
333 BUFFER_ADD ("%"PRIu64, vl->values[ds_num].absolute);
334 else
335 {
336 ERROR ("format_values plugin: Unknown data source type: %i",
337 ds->ds[ds_num].type);
338 sfree (rates);
339 return (-1);
340 }
342 #undef BUFFER_ADD
344 sfree (rates);
345 return (0);
346 }
348 static void wg_copy_escape_part (char *dst, const char *src, size_t dst_len,
349 char escape_char)
350 {
351 size_t i;
353 memset (dst, 0, dst_len);
355 if (src == NULL)
356 return;
358 for (i = 0; i < dst_len; i++)
359 {
360 if ((src[i] == '.')
361 || isspace ((int) src[i])
362 || iscntrl ((int) src[i]))
363 dst[i] = escape_char;
364 else
365 dst[i] = src[i];
367 if (src[i] == 0)
368 break;
369 }
370 }
372 static int wg_format_name (char *ret, int ret_len,
373 const char *hostname,
374 const char *plugin, const char *plugin_instance,
375 const char *type, const char *type_instance,
376 const char *prefix, const char *postfix,
377 const char *ds_name, char escape_char)
378 {
379 char n_hostname[DATA_MAX_NAME_LEN];
380 char n_plugin[DATA_MAX_NAME_LEN];
381 char n_plugin_instance[DATA_MAX_NAME_LEN];
382 char n_type[DATA_MAX_NAME_LEN];
383 char n_type_instance[DATA_MAX_NAME_LEN];
384 int status;
386 assert (hostname != NULL);
387 assert (plugin != NULL);
388 assert (type != NULL);
389 assert (ds_name != NULL);
391 if (prefix == NULL)
392 prefix = "";
394 if (postfix == NULL)
395 postfix = "";
397 wg_copy_escape_part (n_hostname, hostname,
398 sizeof (n_hostname), escape_char);
399 wg_copy_escape_part (n_plugin, plugin,
400 sizeof (n_plugin), escape_char);
401 wg_copy_escape_part (n_plugin_instance, plugin_instance,
402 sizeof (n_plugin_instance), escape_char);
403 wg_copy_escape_part (n_type, type,
404 sizeof (n_type), escape_char);
405 wg_copy_escape_part (n_type_instance, type_instance,
406 sizeof (n_type_instance), escape_char);
408 if (n_plugin_instance[0] == '\0')
409 {
410 if (n_type_instance[0] == '\0')
411 {
412 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s.%s",
413 prefix, n_hostname, postfix, n_plugin, n_type, ds_name);
414 }
415 else
416 {
417 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s-%s.%s",
418 prefix, n_hostname, postfix, n_plugin, n_type,
419 n_type_instance, ds_name);
420 }
421 }
422 else
423 {
424 if (n_type_instance[0] == '\0')
425 {
426 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s.%s.%s",
427 prefix, n_hostname, postfix, n_plugin,
428 n_plugin_instance, n_type, ds_name);
429 }
430 else
431 {
432 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s.%s-%s.%s",
433 prefix, n_hostname, postfix, n_plugin,
434 n_plugin_instance, n_type, n_type_instance, ds_name);
435 }
436 }
438 if ((status < 1) || (status >= ret_len))
439 return (-1);
441 return (0);
442 }
444 static int wg_send_message (const char* key, const char* value,
445 cdtime_t time, struct wg_callback *cb)
446 {
447 int status;
448 size_t message_len;
449 char message[1024];
451 message_len = (size_t) ssnprintf (message, sizeof (message),
452 "%s %s %.0f\n",
453 key,
454 value,
455 CDTIME_T_TO_DOUBLE(time));
456 if (message_len >= sizeof (message)) {
457 ERROR ("write_graphite plugin: message buffer too small: "
458 "Need %zu bytes.", message_len + 1);
459 return (-1);
460 }
463 pthread_mutex_lock (&cb->send_lock);
465 if (cb->sock_fd < 0)
466 {
467 status = wg_callback_init (cb);
468 if (status != 0)
469 {
470 ERROR ("write_graphite plugin: wg_callback_init failed.");
471 pthread_mutex_unlock (&cb->send_lock);
472 return (-1);
473 }
474 }
476 if (message_len >= cb->send_buf_free)
477 {
478 status = wg_flush_nolock (/* timeout = */ 0, cb);
479 if (status != 0)
480 {
481 pthread_mutex_unlock (&cb->send_lock);
482 return (status);
483 }
484 }
485 assert (message_len < cb->send_buf_free);
487 /* `message_len + 1' because `message_len' does not include the
488 * trailing null byte. Neither does `send_buffer_fill'. */
489 memcpy (cb->send_buf + cb->send_buf_fill,
490 message, message_len + 1);
491 cb->send_buf_fill += message_len;
492 cb->send_buf_free -= message_len;
494 DEBUG ("write_graphite plugin: <%s:%s> buf %zu/%zu (%g%%) \"%s\"",
495 cb->node,
496 cb->service,
497 cb->send_buf_fill, sizeof (cb->send_buf),
498 100.0 * ((double) cb->send_buf_fill) / ((double) sizeof (cb->send_buf)),
499 message);
501 /* Check if we have enough space for this message. */
502 pthread_mutex_unlock (&cb->send_lock);
504 return (0);
505 }
507 static int wg_write_messages (const data_set_t *ds, const value_list_t *vl,
508 struct wg_callback *cb)
509 {
510 char key[10*DATA_MAX_NAME_LEN];
511 char values[512];
513 int status, i;
515 if (0 != strcmp (ds->type, vl->type))
516 {
517 ERROR ("write_graphite plugin: DS type does not match "
518 "value list type");
519 return -1;
520 }
522 if (ds->ds_num > 1)
523 {
524 for (i = 0; i < ds->ds_num; i++)
525 {
526 /* Copy the identifier to `key' and escape it. */
527 status = WG_FORMAT_NAME (key, sizeof (key), vl, cb, ds->ds[i].name);
528 if (status != 0)
529 {
530 ERROR ("write_graphite plugin: error with format_name");
531 return (status);
532 }
534 escape_string (key, sizeof (key));
535 /* Convert the values to an ASCII representation and put that
536 * into `values'. */
537 status = wg_format_values (values, sizeof (values), i, ds, vl, 0);
538 if (status != 0)
539 {
540 ERROR ("write_graphite plugin: error with "
541 "wg_format_values");
542 return (status);
543 }
545 /* Send the message to graphite */
546 status = wg_send_message (key, values, vl->time, cb);
547 if (status != 0)
548 {
549 ERROR ("write_graphite plugin: error with "
550 "wg_send_message");
551 return (status);
552 }
553 }
554 }
555 else
556 {
557 /* Copy the identifier to `key' and escape it. */
558 status = WG_FORMAT_NAME (key, sizeof (key), vl, cb, NULL);
559 if (status != 0)
560 {
561 ERROR ("write_graphite plugin: error with format_name");
562 return (status);
563 }
565 escape_string (key, sizeof (key));
566 /* Convert the values to an ASCII representation and put that into
567 * `values'. */
568 status = wg_format_values (values, sizeof (values), 0, ds, vl, 0);
569 if (status != 0)
570 {
571 ERROR ("write_graphite plugin: error with "
572 "wg_format_values");
573 return (status);
574 }
576 /* Send the message to graphite */
577 status = wg_send_message (key, values, vl->time, cb);
578 if (status != 0)
579 {
580 ERROR ("write_graphite plugin: error with "
581 "wg_send_message");
582 return (status);
583 }
584 }
586 return (0);
587 }
589 static int wg_write (const data_set_t *ds, const value_list_t *vl,
590 user_data_t *user_data)
591 {
592 struct wg_callback *cb;
593 int status;
595 if (user_data == NULL)
596 return (-EINVAL);
598 cb = user_data->data;
600 status = wg_write_messages (ds, vl, cb);
602 return (status);
603 }
605 static int config_set_char (char *dest,
606 oconfig_item_t *ci)
607 {
608 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
609 {
610 WARNING ("write_graphite plugin: The `%s' config option "
611 "needs exactly one string argument.", ci->key);
612 return (-1);
613 }
615 *dest = ci->values[0].value.string[0];
617 return (0);
618 }
620 static int wg_config_carbon (oconfig_item_t *ci)
621 {
622 struct wg_callback *cb;
623 user_data_t user_data;
624 int i;
626 cb = malloc (sizeof (*cb));
627 if (cb == NULL)
628 {
629 ERROR ("write_graphite plugin: malloc failed.");
630 return (-1);
631 }
632 memset (cb, 0, sizeof (*cb));
633 cb->sock_fd = -1;
634 cb->node = NULL;
635 cb->service = NULL;
636 cb->prefix = NULL;
637 cb->postfix = NULL;
638 cb->escape_char = '_';
640 pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
642 for (i = 0; i < ci->children_num; i++)
643 {
644 oconfig_item_t *child = ci->children + i;
646 if (strcasecmp ("Host", child->key) == 0)
647 cf_util_get_string (child, &cb->node);
648 else if (strcasecmp ("Port", child->key) == 0)
649 cf_util_get_string (child, &cb->service);
650 else if (strcasecmp ("Prefix", child->key) == 0)
651 cf_util_get_string (child, &cb->prefix);
652 else if (strcasecmp ("Postfix", child->key) == 0)
653 cf_util_get_string (child, &cb->postfix);
654 else if (strcasecmp ("EscapeCharacter", child->key) == 0)
655 config_set_char (&cb->escape_char, child);
656 else
657 {
658 ERROR ("write_graphite plugin: Invalid configuration "
659 "option: %s.", child->key);
660 }
661 }
663 DEBUG ("write_graphite: Registering write callback to carbon agent %s:%s",
664 cb->node ? cb->node : WG_DEFAULT_NODE,
665 cb->service ? cb->service : WG_DEFAULT_SERVICE);
667 memset (&user_data, 0, sizeof (user_data));
668 user_data.data = cb;
669 user_data.free_func = NULL;
670 plugin_register_flush ("write_graphite", wg_flush, &user_data);
672 user_data.free_func = wg_callback_free;
673 plugin_register_write ("write_graphite", wg_write, &user_data);
675 return (0);
676 }
678 static int wg_config (oconfig_item_t *ci)
679 {
680 int i;
682 for (i = 0; i < ci->children_num; i++)
683 {
684 oconfig_item_t *child = ci->children + i;
686 if (strcasecmp ("Carbon", child->key) == 0)
687 wg_config_carbon (child);
688 else
689 {
690 ERROR ("write_graphite plugin: Invalid configuration "
691 "option: %s.", child->key);
692 }
693 }
695 return (0);
696 }
698 void module_register (void)
699 {
700 plugin_register_complex_config ("write_graphite", wg_config);
701 }
703 /* vim: set sw=4 ts=4 sts=4 tw=78 et : */