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_DEFAULT_NODE
58 # define WG_DEFAULT_NODE "localhost"
59 #endif
61 #ifndef WG_DEFAULT_SERVICE
62 # define WG_DEFAULT_SERVICE "2003"
63 #endif
65 #ifndef WG_DEFAULT_ESCAPE
66 # define WG_DEFAULT_ESCAPE '_'
67 #endif
69 /* Ethernet - (IPv6 + TCP) = 1500 - (40 + 32) = 1428 */
70 #ifndef WG_SEND_BUF_SIZE
71 # define WG_SEND_BUF_SIZE 1428
72 #endif
74 /*
75 * Private variables
76 */
77 struct wg_callback
78 {
79 int sock_fd;
81 char *node;
82 char *service;
83 char *prefix;
84 char *postfix;
85 char escape_char;
87 _Bool store_rates;
88 _Bool always_append_ds;
90 char send_buf[WG_SEND_BUF_SIZE];
91 size_t send_buf_free;
92 size_t send_buf_fill;
93 cdtime_t send_buf_init_time;
95 pthread_mutex_t send_lock;
96 };
99 /*
100 * Functions
101 */
102 static void wg_reset_buffer (struct wg_callback *cb)
103 {
104 memset (cb->send_buf, 0, sizeof (cb->send_buf));
105 cb->send_buf_free = sizeof (cb->send_buf);
106 cb->send_buf_fill = 0;
107 cb->send_buf_init_time = cdtime ();
108 }
110 static int wg_send_buffer (struct wg_callback *cb)
111 {
112 int status = 0;
114 status = write (cb->sock_fd, cb->send_buf, strlen (cb->send_buf));
115 if (status < 0)
116 {
117 ERROR ("write_graphite plugin: send failed with "
118 "status %i (%s)",
119 status,
120 strerror (errno));
122 close (cb->sock_fd);
123 cb->sock_fd = -1;
125 return (-1);
126 }
127 return (0);
128 }
130 /* NOTE: You must hold cb->send_lock when calling this function! */
131 static int wg_flush_nolock (cdtime_t timeout, struct wg_callback *cb)
132 {
133 int status;
135 DEBUG ("write_graphite plugin: wg_flush_nolock: timeout = %.3f; "
136 "send_buf_fill = %zu;",
137 (double)timeout,
138 cb->send_buf_fill);
140 /* timeout == 0 => flush unconditionally */
141 if (timeout > 0)
142 {
143 cdtime_t now;
145 now = cdtime ();
146 if ((cb->send_buf_init_time + timeout) > now)
147 return (0);
148 }
150 if (cb->send_buf_fill <= 0)
151 {
152 cb->send_buf_init_time = cdtime ();
153 return (0);
154 }
156 status = wg_send_buffer (cb);
157 wg_reset_buffer (cb);
159 return (status);
160 }
162 static int wg_callback_init (struct wg_callback *cb)
163 {
164 struct addrinfo ai_hints;
165 struct addrinfo *ai_list;
166 struct addrinfo *ai_ptr;
167 int status;
169 const char *node = cb->node ? cb->node : WG_DEFAULT_NODE;
170 const char *service = cb->service ? cb->service : WG_DEFAULT_SERVICE;
172 if (cb->sock_fd > 0)
173 return (0);
175 memset (&ai_hints, 0, sizeof (ai_hints));
176 #ifdef AI_ADDRCONFIG
177 ai_hints.ai_flags |= AI_ADDRCONFIG;
178 #endif
179 ai_hints.ai_family = AF_UNSPEC;
180 ai_hints.ai_socktype = SOCK_STREAM;
182 ai_list = NULL;
184 status = getaddrinfo (node, service, &ai_hints, &ai_list);
185 if (status != 0)
186 {
187 ERROR ("write_graphite plugin: getaddrinfo (%s, %s) failed: %s",
188 node, service, gai_strerror (status));
189 return (-1);
190 }
192 assert (ai_list != NULL);
193 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
194 {
195 cb->sock_fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
196 ai_ptr->ai_protocol);
197 if (cb->sock_fd < 0)
198 continue;
200 status = connect (cb->sock_fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
201 if (status != 0)
202 {
203 close (cb->sock_fd);
204 cb->sock_fd = -1;
205 continue;
206 }
208 break;
209 }
211 freeaddrinfo (ai_list);
213 if (cb->sock_fd < 0)
214 {
215 char errbuf[1024];
216 ERROR ("write_graphite plugin: Connecting to %s:%s failed. "
217 "The last error was: %s", node, service,
218 sstrerror (errno, errbuf, sizeof (errbuf)));
219 close (cb->sock_fd);
220 return (-1);
221 }
223 wg_reset_buffer (cb);
225 return (0);
226 }
228 static void wg_callback_free (void *data)
229 {
230 struct wg_callback *cb;
232 if (data == NULL)
233 return;
235 cb = data;
237 pthread_mutex_lock (&cb->send_lock);
239 wg_flush_nolock (/* timeout = */ 0, cb);
241 close(cb->sock_fd);
242 cb->sock_fd = -1;
244 sfree(cb->node);
245 sfree(cb->service);
246 sfree(cb->prefix);
247 sfree(cb->postfix);
249 pthread_mutex_destroy (&cb->send_lock);
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] == 0)
361 {
362 dst[i] = 0;
363 break;
364 }
366 if ((src[i] == '.')
367 || isspace ((int) src[i])
368 || iscntrl ((int) src[i]))
369 dst[i] = escape_char;
370 else
371 dst[i] = src[i];
372 }
373 }
375 static int wg_format_name (char *ret, int ret_len,
376 const value_list_t *vl,
377 const struct wg_callback *cb,
378 const char *ds_name)
379 {
380 char n_host[DATA_MAX_NAME_LEN];
381 char n_plugin[DATA_MAX_NAME_LEN];
382 char n_plugin_instance[DATA_MAX_NAME_LEN];
383 char n_type[DATA_MAX_NAME_LEN];
384 char n_type_instance[DATA_MAX_NAME_LEN];
386 char *prefix;
387 char *postfix;
389 char tmp_plugin[2 * DATA_MAX_NAME_LEN + 1];
390 char tmp_type[2 * DATA_MAX_NAME_LEN + 1];
392 prefix = cb->prefix;
393 if (prefix == NULL)
394 prefix = "";
396 postfix = cb->postfix;
397 if (postfix == NULL)
398 postfix = "";
400 wg_copy_escape_part (n_host, vl->host,
401 sizeof (n_host), cb->escape_char);
402 wg_copy_escape_part (n_plugin, vl->plugin,
403 sizeof (n_plugin), cb->escape_char);
404 wg_copy_escape_part (n_plugin_instance, vl->plugin_instance,
405 sizeof (n_plugin_instance), cb->escape_char);
406 wg_copy_escape_part (n_type, vl->type,
407 sizeof (n_type), cb->escape_char);
408 wg_copy_escape_part (n_type_instance, vl->type_instance,
409 sizeof (n_type_instance), cb->escape_char);
411 if (n_plugin_instance[0] != '\0')
412 ssnprintf (tmp_plugin, sizeof (tmp_plugin), "%s-%s",
413 n_plugin, n_plugin_instance);
414 else
415 sstrncpy (tmp_plugin, n_plugin, sizeof (tmp_plugin));
417 if (n_type_instance[0] != '\0')
418 ssnprintf (tmp_type, sizeof (tmp_type), "%s-%s",
419 n_type, n_type_instance);
420 else
421 sstrncpy (tmp_type, n_type, sizeof (tmp_type));
423 if (ds_name != NULL)
424 ssnprintf (ret, ret_len, "%s%s%s.%s.%s.%s",
425 prefix, n_host, postfix, tmp_plugin, tmp_type, ds_name);
426 else
427 ssnprintf (ret, ret_len, "%s%s%s.%s.%s",
428 prefix, n_host, postfix, tmp_plugin, tmp_type);
430 return (0);
431 }
433 static int wg_send_message (const char* key, const char* value,
434 cdtime_t time, struct wg_callback *cb)
435 {
436 int status;
437 size_t message_len;
438 char message[1024];
440 message_len = (size_t) ssnprintf (message, sizeof (message),
441 "%s %s %.0f\n",
442 key,
443 value,
444 CDTIME_T_TO_DOUBLE(time));
445 if (message_len >= sizeof (message)) {
446 ERROR ("write_graphite plugin: message buffer too small: "
447 "Need %zu bytes.", message_len + 1);
448 return (-1);
449 }
452 pthread_mutex_lock (&cb->send_lock);
454 if (cb->sock_fd < 0)
455 {
456 status = wg_callback_init (cb);
457 if (status != 0)
458 {
459 ERROR ("write_graphite plugin: wg_callback_init failed.");
460 pthread_mutex_unlock (&cb->send_lock);
461 return (-1);
462 }
463 }
465 if (message_len >= cb->send_buf_free)
466 {
467 status = wg_flush_nolock (/* timeout = */ 0, cb);
468 if (status != 0)
469 {
470 pthread_mutex_unlock (&cb->send_lock);
471 return (status);
472 }
473 }
474 assert (message_len < cb->send_buf_free);
476 /* `message_len + 1' because `message_len' does not include the
477 * trailing null byte. Neither does `send_buffer_fill'. */
478 memcpy (cb->send_buf + cb->send_buf_fill,
479 message, message_len + 1);
480 cb->send_buf_fill += message_len;
481 cb->send_buf_free -= message_len;
483 DEBUG ("write_graphite plugin: <%s:%s> buf %zu/%zu (%g%%) \"%s\"",
484 cb->node,
485 cb->service,
486 cb->send_buf_fill, sizeof (cb->send_buf),
487 100.0 * ((double) cb->send_buf_fill) / ((double) sizeof (cb->send_buf)),
488 message);
490 /* Check if we have enough space for this message. */
491 pthread_mutex_unlock (&cb->send_lock);
493 return (0);
494 }
496 static int wg_write_messages (const data_set_t *ds, const value_list_t *vl,
497 struct wg_callback *cb)
498 {
499 char key[10*DATA_MAX_NAME_LEN];
500 char values[512];
502 int status, i;
504 if (0 != strcmp (ds->type, vl->type))
505 {
506 ERROR ("write_graphite plugin: DS type does not match "
507 "value list type");
508 return -1;
509 }
511 if (ds->ds_num > 1)
512 {
513 for (i = 0; i < ds->ds_num; i++)
514 {
515 /* Copy the identifier to `key' and escape it. */
516 status = wg_format_name (key, sizeof (key), vl, cb, ds->ds[i].name);
517 if (status != 0)
518 {
519 ERROR ("write_graphite plugin: error with format_name");
520 return (status);
521 }
523 escape_string (key, sizeof (key));
524 /* Convert the values to an ASCII representation and put that
525 * into `values'. */
526 status = wg_format_values (values, sizeof (values), i, ds, vl,
527 cb->store_rates);
528 if (status != 0)
529 {
530 ERROR ("write_graphite plugin: error with "
531 "wg_format_values");
532 return (status);
533 }
535 /* Send the message to graphite */
536 status = wg_send_message (key, values, vl->time, cb);
537 if (status != 0)
538 {
539 ERROR ("write_graphite plugin: error with "
540 "wg_send_message");
541 return (status);
542 }
543 }
544 }
545 else
546 {
547 /* Copy the identifier to `key' and escape it. */
548 status = wg_format_name (key, sizeof (key), vl, cb,
549 cb->always_append_ds ? ds->ds[0].name : NULL);
550 if (status != 0)
551 {
552 ERROR ("write_graphite plugin: error with format_name");
553 return (status);
554 }
556 escape_string (key, sizeof (key));
557 /* Convert the values to an ASCII representation and put that into
558 * `values'. */
559 status = wg_format_values (values, sizeof (values), 0, ds, vl,
560 cb->store_rates);
561 if (status != 0)
562 {
563 ERROR ("write_graphite plugin: error with "
564 "wg_format_values");
565 return (status);
566 }
568 /* Send the message to graphite */
569 status = wg_send_message (key, values, vl->time, cb);
570 if (status != 0)
571 {
572 ERROR ("write_graphite plugin: error with "
573 "wg_send_message");
574 return (status);
575 }
576 }
578 return (0);
579 }
581 static int wg_write (const data_set_t *ds, const value_list_t *vl,
582 user_data_t *user_data)
583 {
584 struct wg_callback *cb;
585 int status;
587 if (user_data == NULL)
588 return (EINVAL);
590 cb = user_data->data;
592 status = wg_write_messages (ds, vl, cb);
594 return (status);
595 }
597 static int config_set_char (char *dest,
598 oconfig_item_t *ci)
599 {
600 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
601 {
602 WARNING ("write_graphite plugin: The `%s' config option "
603 "needs exactly one string argument.", ci->key);
604 return (-1);
605 }
607 *dest = ci->values[0].value.string[0];
609 return (0);
610 }
612 static int wg_config_carbon (oconfig_item_t *ci)
613 {
614 struct wg_callback *cb;
615 user_data_t user_data;
616 int i;
618 cb = malloc (sizeof (*cb));
619 if (cb == NULL)
620 {
621 ERROR ("write_graphite plugin: malloc failed.");
622 return (-1);
623 }
624 memset (cb, 0, sizeof (*cb));
625 cb->sock_fd = -1;
626 cb->node = NULL;
627 cb->service = NULL;
628 cb->prefix = NULL;
629 cb->postfix = NULL;
630 cb->escape_char = WG_DEFAULT_ESCAPE;
632 pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
634 for (i = 0; i < ci->children_num; i++)
635 {
636 oconfig_item_t *child = ci->children + i;
638 if (strcasecmp ("Host", child->key) == 0)
639 cf_util_get_string (child, &cb->node);
640 else if (strcasecmp ("Port", child->key) == 0)
641 cf_util_get_service (child, &cb->service);
642 else if (strcasecmp ("Prefix", child->key) == 0)
643 cf_util_get_string (child, &cb->prefix);
644 else if (strcasecmp ("Postfix", child->key) == 0)
645 cf_util_get_string (child, &cb->postfix);
646 else if (strcasecmp ("StoreRates", child->key) == 0)
647 cf_util_get_boolean (child, &cb->store_rates);
648 else if (strcasecmp ("AlwaysAppendDS", child->key) == 0)
649 cf_util_get_boolean (child, &cb->always_append_ds);
650 else if (strcasecmp ("EscapeCharacter", child->key) == 0)
651 config_set_char (&cb->escape_char, child);
652 else
653 {
654 ERROR ("write_graphite plugin: Invalid configuration "
655 "option: %s.", child->key);
656 }
657 }
659 DEBUG ("write_graphite: Registering write callback to carbon agent %s:%s",
660 cb->node ? cb->node : WG_DEFAULT_NODE,
661 cb->service ? cb->service : WG_DEFAULT_SERVICE);
663 memset (&user_data, 0, sizeof (user_data));
664 user_data.data = cb;
665 user_data.free_func = NULL;
666 plugin_register_flush ("write_graphite", wg_flush, &user_data);
668 user_data.free_func = wg_callback_free;
669 plugin_register_write ("write_graphite", wg_write, &user_data);
671 return (0);
672 }
674 static int wg_config (oconfig_item_t *ci)
675 {
676 int i;
678 for (i = 0; i < ci->children_num; i++)
679 {
680 oconfig_item_t *child = ci->children + i;
682 if (strcasecmp ("Carbon", child->key) == 0)
683 wg_config_carbon (child);
684 else
685 {
686 ERROR ("write_graphite plugin: Invalid configuration "
687 "option: %s.", child->key);
688 }
689 }
691 return (0);
692 }
694 void module_register (void)
695 {
696 plugin_register_complex_config ("write_graphite", wg_config);
697 }
699 /* vim: set sw=4 ts=4 sts=4 tw=78 et : */