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_DEFAULT_ESCAPE
75 # define WG_DEFAULT_ESCAPE '_'
76 #endif
78 #ifndef WG_SEND_BUF_SIZE
79 # define WG_SEND_BUF_SIZE 4096
80 #endif
82 /*
83 * Private variables
84 */
85 struct wg_callback
86 {
87 int sock_fd;
89 char *node;
90 char *service;
91 char *prefix;
92 char *postfix;
93 char escape_char;
95 char send_buf[WG_SEND_BUF_SIZE];
96 size_t send_buf_free;
97 size_t send_buf_fill;
98 cdtime_t send_buf_init_time;
100 pthread_mutex_t send_lock;
101 };
104 /*
105 * Functions
106 */
107 static void wg_reset_buffer (struct wg_callback *cb)
108 {
109 memset (cb->send_buf, 0, sizeof (cb->send_buf));
110 cb->send_buf_free = sizeof (cb->send_buf);
111 cb->send_buf_fill = 0;
112 cb->send_buf_init_time = cdtime ();
113 }
115 static int wg_send_buffer (struct wg_callback *cb)
116 {
117 int status = 0;
119 status = write (cb->sock_fd, cb->send_buf, strlen (cb->send_buf));
120 if (status < 0)
121 {
122 ERROR ("write_graphite plugin: send failed with "
123 "status %i (%s)",
124 status,
125 strerror (errno));
127 close (cb->sock_fd);
128 cb->sock_fd = -1;
130 return (-1);
131 }
132 return (0);
133 }
135 /* NOTE: You must hold cb->send_lock when calling this function! */
136 static int wg_flush_nolock (cdtime_t timeout, struct wg_callback *cb)
137 {
138 int status;
140 DEBUG ("write_graphite plugin: wg_flush_nolock: timeout = %.3f; "
141 "send_buf_fill = %zu;",
142 (double)timeout,
143 cb->send_buf_fill);
145 /* timeout == 0 => flush unconditionally */
146 if (timeout > 0)
147 {
148 cdtime_t now;
150 now = cdtime ();
151 if ((cb->send_buf_init_time + timeout) > now)
152 return (0);
153 }
155 if (cb->send_buf_fill <= 0)
156 {
157 cb->send_buf_init_time = cdtime ();
158 return (0);
159 }
161 status = wg_send_buffer (cb);
162 wg_reset_buffer (cb);
164 return (status);
165 }
167 static int wg_callback_init (struct wg_callback *cb)
168 {
169 struct addrinfo ai_hints;
170 struct addrinfo *ai_list;
171 struct addrinfo *ai_ptr;
172 int status;
174 const char *node = cb->node ? cb->node : WG_DEFAULT_NODE;
175 const char *service = cb->service ? cb->service : WG_DEFAULT_SERVICE;
177 if (cb->sock_fd > 0)
178 return (0);
180 memset (&ai_hints, 0, sizeof (ai_hints));
181 #ifdef AI_ADDRCONFIG
182 ai_hints.ai_flags |= AI_ADDRCONFIG;
183 #endif
184 ai_hints.ai_family = AF_UNSPEC;
185 ai_hints.ai_socktype = SOCK_STREAM;
187 ai_list = NULL;
189 status = getaddrinfo (node, service, &ai_hints, &ai_list);
190 if (status != 0)
191 {
192 ERROR ("write_graphite plugin: getaddrinfo (%s, %s) failed: %s",
193 node, service, gai_strerror (status));
194 return (-1);
195 }
197 assert (ai_list != NULL);
198 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
199 {
200 cb->sock_fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
201 ai_ptr->ai_protocol);
202 if (cb->sock_fd < 0)
203 continue;
205 status = connect (cb->sock_fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
206 if (status != 0)
207 {
208 close (cb->sock_fd);
209 cb->sock_fd = -1;
210 continue;
211 }
213 break;
214 }
216 freeaddrinfo (ai_list);
218 if (cb->sock_fd < 0)
219 {
220 char errbuf[1024];
221 ERROR ("write_graphite plugin: Connecting to %s:%s failed. "
222 "The last error was: %s", node, service,
223 sstrerror (errno, errbuf, sizeof (errbuf)));
224 close (cb->sock_fd);
225 return (-1);
226 }
228 wg_reset_buffer (cb);
230 return (0);
231 }
233 static void wg_callback_free (void *data)
234 {
235 struct wg_callback *cb;
237 if (data == NULL)
238 return;
240 cb = data;
242 pthread_mutex_lock (&cb->send_lock);
244 wg_flush_nolock (/* timeout = */ 0, cb);
246 close(cb->sock_fd);
247 cb->sock_fd = -1;
249 sfree(cb->node);
250 sfree(cb->service);
251 sfree(cb->prefix);
252 sfree(cb->postfix);
254 pthread_mutex_destroy (&cb->send_lock);
256 sfree(cb);
257 }
259 static int wg_flush (cdtime_t timeout,
260 const char *identifier __attribute__((unused)),
261 user_data_t *user_data)
262 {
263 struct wg_callback *cb;
264 int status;
266 if (user_data == NULL)
267 return (-EINVAL);
269 cb = user_data->data;
271 pthread_mutex_lock (&cb->send_lock);
273 if (cb->sock_fd < 0)
274 {
275 status = wg_callback_init (cb);
276 if (status != 0)
277 {
278 ERROR ("write_graphite plugin: wg_callback_init failed.");
279 pthread_mutex_unlock (&cb->send_lock);
280 return (-1);
281 }
282 }
284 status = wg_flush_nolock (timeout, cb);
285 pthread_mutex_unlock (&cb->send_lock);
287 return (status);
288 }
290 static int wg_format_values (char *ret, size_t ret_len,
291 int ds_num, const data_set_t *ds, const value_list_t *vl,
292 _Bool store_rates)
293 {
294 size_t offset = 0;
295 int status;
296 gauge_t *rates = NULL;
298 assert (0 == strcmp (ds->type, vl->type));
300 memset (ret, 0, ret_len);
302 #define BUFFER_ADD(...) do { \
303 status = ssnprintf (ret + offset, ret_len - offset, \
304 __VA_ARGS__); \
305 if (status < 1) \
306 { \
307 sfree (rates); \
308 return (-1); \
309 } \
310 else if (((size_t) status) >= (ret_len - offset)) \
311 { \
312 sfree (rates); \
313 return (-1); \
314 } \
315 else \
316 offset += ((size_t) status); \
317 } while (0)
319 if (ds->ds[ds_num].type == DS_TYPE_GAUGE)
320 BUFFER_ADD ("%f", vl->values[ds_num].gauge);
321 else if (store_rates)
322 {
323 if (rates == NULL)
324 rates = uc_get_rate (ds, vl);
325 if (rates == NULL)
326 {
327 WARNING ("format_values: "
328 "uc_get_rate failed.");
329 return (-1);
330 }
331 BUFFER_ADD ("%g", rates[ds_num]);
332 }
333 else if (ds->ds[ds_num].type == DS_TYPE_COUNTER)
334 BUFFER_ADD ("%llu", vl->values[ds_num].counter);
335 else if (ds->ds[ds_num].type == DS_TYPE_DERIVE)
336 BUFFER_ADD ("%"PRIi64, vl->values[ds_num].derive);
337 else if (ds->ds[ds_num].type == DS_TYPE_ABSOLUTE)
338 BUFFER_ADD ("%"PRIu64, vl->values[ds_num].absolute);
339 else
340 {
341 ERROR ("format_values plugin: Unknown data source type: %i",
342 ds->ds[ds_num].type);
343 sfree (rates);
344 return (-1);
345 }
347 #undef BUFFER_ADD
349 sfree (rates);
350 return (0);
351 }
353 static void wg_copy_escape_part (char *dst, const char *src, size_t dst_len,
354 char escape_char)
355 {
356 size_t i;
358 memset (dst, 0, dst_len);
360 if (src == NULL)
361 return;
363 for (i = 0; i < dst_len; i++)
364 {
365 if ((src[i] == '.')
366 || isspace ((int) src[i])
367 || iscntrl ((int) src[i]))
368 dst[i] = escape_char;
369 else
370 dst[i] = src[i];
372 if (src[i] == 0)
373 break;
374 }
375 }
377 static int wg_format_name (char *ret, int ret_len,
378 const char *hostname,
379 const char *plugin, const char *plugin_instance,
380 const char *type, const char *type_instance,
381 const char *prefix, const char *postfix,
382 const char *ds_name, char escape_char)
383 {
384 char n_hostname[DATA_MAX_NAME_LEN];
385 char n_plugin[DATA_MAX_NAME_LEN];
386 char n_plugin_instance[DATA_MAX_NAME_LEN];
387 char n_type[DATA_MAX_NAME_LEN];
388 char n_type_instance[DATA_MAX_NAME_LEN];
389 int status;
391 assert (hostname != NULL);
392 assert (plugin != NULL);
393 assert (type != NULL);
394 assert (ds_name != NULL);
396 if (prefix == NULL)
397 prefix = "";
399 if (postfix == NULL)
400 postfix = "";
402 wg_copy_escape_part (n_hostname, hostname,
403 sizeof (n_hostname), escape_char);
404 wg_copy_escape_part (n_plugin, plugin,
405 sizeof (n_plugin), escape_char);
406 wg_copy_escape_part (n_plugin_instance, plugin_instance,
407 sizeof (n_plugin_instance), escape_char);
408 wg_copy_escape_part (n_type, type,
409 sizeof (n_type), escape_char);
410 wg_copy_escape_part (n_type_instance, type_instance,
411 sizeof (n_type_instance), escape_char);
413 if (n_plugin_instance[0] == '\0')
414 {
415 if (n_type_instance[0] == '\0')
416 {
417 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s.%s",
418 prefix, n_hostname, postfix, n_plugin, n_type, ds_name);
419 }
420 else
421 {
422 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s-%s.%s",
423 prefix, n_hostname, postfix, n_plugin, n_type,
424 n_type_instance, ds_name);
425 }
426 }
427 else
428 {
429 if (n_type_instance[0] == '\0')
430 {
431 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s.%s.%s",
432 prefix, n_hostname, postfix, n_plugin,
433 n_plugin_instance, n_type, ds_name);
434 }
435 else
436 {
437 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s.%s-%s.%s",
438 prefix, n_hostname, postfix, n_plugin,
439 n_plugin_instance, n_type, n_type_instance, ds_name);
440 }
441 }
443 if ((status < 1) || (status >= ret_len))
444 return (-1);
446 return (0);
447 }
449 static int wg_send_message (const char* key, const char* value,
450 cdtime_t time, struct wg_callback *cb)
451 {
452 int status;
453 size_t message_len;
454 char message[1024];
456 message_len = (size_t) ssnprintf (message, sizeof (message),
457 "%s %s %.0f\n",
458 key,
459 value,
460 CDTIME_T_TO_DOUBLE(time));
461 if (message_len >= sizeof (message)) {
462 ERROR ("write_graphite plugin: message buffer too small: "
463 "Need %zu bytes.", message_len + 1);
464 return (-1);
465 }
468 pthread_mutex_lock (&cb->send_lock);
470 if (cb->sock_fd < 0)
471 {
472 status = wg_callback_init (cb);
473 if (status != 0)
474 {
475 ERROR ("write_graphite plugin: wg_callback_init failed.");
476 pthread_mutex_unlock (&cb->send_lock);
477 return (-1);
478 }
479 }
481 if (message_len >= cb->send_buf_free)
482 {
483 status = wg_flush_nolock (/* timeout = */ 0, cb);
484 if (status != 0)
485 {
486 pthread_mutex_unlock (&cb->send_lock);
487 return (status);
488 }
489 }
490 assert (message_len < cb->send_buf_free);
492 /* `message_len + 1' because `message_len' does not include the
493 * trailing null byte. Neither does `send_buffer_fill'. */
494 memcpy (cb->send_buf + cb->send_buf_fill,
495 message, message_len + 1);
496 cb->send_buf_fill += message_len;
497 cb->send_buf_free -= message_len;
499 DEBUG ("write_graphite plugin: <%s:%s> buf %zu/%zu (%g%%) \"%s\"",
500 cb->node,
501 cb->service,
502 cb->send_buf_fill, sizeof (cb->send_buf),
503 100.0 * ((double) cb->send_buf_fill) / ((double) sizeof (cb->send_buf)),
504 message);
506 /* Check if we have enough space for this message. */
507 pthread_mutex_unlock (&cb->send_lock);
509 return (0);
510 }
512 static int wg_write_messages (const data_set_t *ds, const value_list_t *vl,
513 struct wg_callback *cb)
514 {
515 char key[10*DATA_MAX_NAME_LEN];
516 char values[512];
518 int status, i;
520 if (0 != strcmp (ds->type, vl->type))
521 {
522 ERROR ("write_graphite plugin: DS type does not match "
523 "value list type");
524 return -1;
525 }
527 if (ds->ds_num > 1)
528 {
529 for (i = 0; i < ds->ds_num; i++)
530 {
531 /* Copy the identifier to `key' and escape it. */
532 status = WG_FORMAT_NAME (key, sizeof (key), vl, cb, ds->ds[i].name);
533 if (status != 0)
534 {
535 ERROR ("write_graphite plugin: error with format_name");
536 return (status);
537 }
539 escape_string (key, sizeof (key));
540 /* Convert the values to an ASCII representation and put that
541 * into `values'. */
542 status = wg_format_values (values, sizeof (values), i, ds, vl, 0);
543 if (status != 0)
544 {
545 ERROR ("write_graphite plugin: error with "
546 "wg_format_values");
547 return (status);
548 }
550 /* Send the message to graphite */
551 status = wg_send_message (key, values, vl->time, cb);
552 if (status != 0)
553 {
554 ERROR ("write_graphite plugin: error with "
555 "wg_send_message");
556 return (status);
557 }
558 }
559 }
560 else
561 {
562 /* Copy the identifier to `key' and escape it. */
563 status = WG_FORMAT_NAME (key, sizeof (key), vl, cb, NULL);
564 if (status != 0)
565 {
566 ERROR ("write_graphite plugin: error with format_name");
567 return (status);
568 }
570 escape_string (key, sizeof (key));
571 /* Convert the values to an ASCII representation and put that into
572 * `values'. */
573 status = wg_format_values (values, sizeof (values), 0, ds, vl, 0);
574 if (status != 0)
575 {
576 ERROR ("write_graphite plugin: error with "
577 "wg_format_values");
578 return (status);
579 }
581 /* Send the message to graphite */
582 status = wg_send_message (key, values, vl->time, cb);
583 if (status != 0)
584 {
585 ERROR ("write_graphite plugin: error with "
586 "wg_send_message");
587 return (status);
588 }
589 }
591 return (0);
592 }
594 static int wg_write (const data_set_t *ds, const value_list_t *vl,
595 user_data_t *user_data)
596 {
597 struct wg_callback *cb;
598 int status;
600 if (user_data == NULL)
601 return (-EINVAL);
603 cb = user_data->data;
605 status = wg_write_messages (ds, vl, cb);
607 return (status);
608 }
610 static int config_set_char (char *dest,
611 oconfig_item_t *ci)
612 {
613 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
614 {
615 WARNING ("write_graphite plugin: The `%s' config option "
616 "needs exactly one string argument.", ci->key);
617 return (-1);
618 }
620 *dest = ci->values[0].value.string[0];
622 return (0);
623 }
625 static int wg_config_carbon (oconfig_item_t *ci)
626 {
627 struct wg_callback *cb;
628 user_data_t user_data;
629 int i;
631 cb = malloc (sizeof (*cb));
632 if (cb == NULL)
633 {
634 ERROR ("write_graphite plugin: malloc failed.");
635 return (-1);
636 }
637 memset (cb, 0, sizeof (*cb));
638 cb->sock_fd = -1;
639 cb->node = NULL;
640 cb->service = NULL;
641 cb->prefix = NULL;
642 cb->postfix = NULL;
643 cb->escape_char = WG_DEFAULT_ESCAPE;
645 pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
647 for (i = 0; i < ci->children_num; i++)
648 {
649 oconfig_item_t *child = ci->children + i;
651 if (strcasecmp ("Host", child->key) == 0)
652 cf_util_get_string (child, &cb->node);
653 else if (strcasecmp ("Port", child->key) == 0)
654 cf_util_get_string (child, &cb->service);
655 else if (strcasecmp ("Prefix", child->key) == 0)
656 cf_util_get_string (child, &cb->prefix);
657 else if (strcasecmp ("Postfix", child->key) == 0)
658 cf_util_get_string (child, &cb->postfix);
659 else if (strcasecmp ("EscapeCharacter", child->key) == 0)
660 config_set_char (&cb->escape_char, child);
661 else
662 {
663 ERROR ("write_graphite plugin: Invalid configuration "
664 "option: %s.", child->key);
665 }
666 }
668 DEBUG ("write_graphite: Registering write callback to carbon agent %s:%s",
669 cb->node ? cb->node : WG_DEFAULT_NODE,
670 cb->service ? cb->service : WG_DEFAULT_SERVICE);
672 memset (&user_data, 0, sizeof (user_data));
673 user_data.data = cb;
674 user_data.free_func = NULL;
675 plugin_register_flush ("write_graphite", wg_flush, &user_data);
677 user_data.free_func = wg_callback_free;
678 plugin_register_write ("write_graphite", wg_write, &user_data);
680 return (0);
681 }
683 static int wg_config (oconfig_item_t *ci)
684 {
685 int i;
687 for (i = 0; i < ci->children_num; i++)
688 {
689 oconfig_item_t *child = ci->children + i;
691 if (strcasecmp ("Carbon", child->key) == 0)
692 wg_config_carbon (child);
693 else
694 {
695 ERROR ("write_graphite plugin: Invalid configuration "
696 "option: %s.", child->key);
697 }
698 }
700 return (0);
701 }
703 void module_register (void)
704 {
705 plugin_register_complex_config ("write_graphite", wg_config);
706 }
708 /* vim: set sw=4 ts=4 sts=4 tw=78 et : */