1 /**
2 * collectd - src/write_graphite.c
3 * Copyright (C) 2011 Scott Sanders
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Author:
19 * Scott Sanders <scott@jssjr.com>
20 *
21 * based on the excellent write_http plugin
22 **/
24 /* write_graphite plugin configuation example
25 *
26 * <Plugin write_graphite>
27 * <Carbon>
28 * Host "localhost"
29 * Port 2003
30 * Prefix "collectd"
31 * </Carbon>
32 * </Plugin>
33 */
35 #include "collectd.h"
36 #include "common.h"
37 #include "plugin.h"
38 #include "configfile.h"
40 #include "utils_cache.h"
41 #include "utils_parse_option.h"
43 /* Folks without pthread will need to disable this plugin. */
44 #include <pthread.h>
46 #include <sys/socket.h>
47 #include <sys/stat.h>
48 #include <sys/types.h>
50 #include <netinet/in.h>
51 #include <netdb.h>
53 #ifndef WG_FORMAT_NAME
54 #define WG_FORMAT_NAME(ret, ret_len, vl, prefix, name) \
55 wg_format_name (ret, ret_len, (vl)->host, (vl)->plugin, \
56 (vl)->plugin_instance, (vl)->type, \
57 (vl)->type_instance, prefix, name)
58 #endif
60 #ifndef WG_SEND_BUF_SIZE
61 #define WG_SEND_BUF_SIZE 4096
62 #endif
64 /*
65 * Private variables
66 */
67 struct wg_callback
68 {
69 int sock_fd;
70 struct hostent *server;
72 char *host;
73 int port;
74 char *prefix;
76 char send_buf[WG_SEND_BUF_SIZE];
77 size_t send_buf_free;
78 size_t send_buf_fill;
79 cdtime_t send_buf_init_time;
81 pthread_mutex_t send_lock;
82 };
85 /*
86 * Functions
87 */
88 static void wg_reset_buffer (struct wg_callback *cb)
89 {
90 memset (cb->send_buf, 0, sizeof (cb->send_buf));
91 cb->send_buf_free = sizeof (cb->send_buf);
92 cb->send_buf_fill = 0;
93 cb->send_buf_init_time = cdtime ();
94 }
96 static int wg_send_buffer (struct wg_callback *cb)
97 {
98 int status = 0;
100 status = write (cb->sock_fd, cb->send_buf, strlen (cb->send_buf));
101 if (status < 0)
102 {
103 ERROR ("write_graphite plugin: send failed with "
104 "status %i (%s)",
105 status,
106 strerror (errno));
108 pthread_mutex_lock (&cb->send_lock);
110 DEBUG ("write_graphite plugin: closing socket and restting fd "
111 "so reinit will occur");
112 close (cb->sock_fd);
113 cb->sock_fd = -1;
115 pthread_mutex_unlock (&cb->send_lock);
117 return (-1);
118 }
119 return (0);
120 }
122 static int wg_flush_nolock (cdtime_t timeout, struct wg_callback *cb)
123 {
124 int status;
126 DEBUG ("write_graphite plugin: wg_flush_nolock: timeout = %.3f; "
127 "send_buf_fill = %zu;",
128 (double)timeout,
129 cb->send_buf_fill);
131 /* timeout == 0 => flush unconditionally */
132 if (timeout > 0)
133 {
134 cdtime_t now;
136 now = cdtime ();
137 if ((cb->send_buf_init_time + timeout) > now)
138 return (0);
139 }
141 if (cb->send_buf_fill <= 0)
142 {
143 cb->send_buf_init_time = cdtime ();
144 return (0);
145 }
147 status = wg_send_buffer (cb);
148 wg_reset_buffer (cb);
150 return (status);
151 }
153 static int wg_callback_init (struct wg_callback *cb)
154 {
155 int status;
157 struct sockaddr_in serv_addr;
159 if (cb->sock_fd > 0)
160 return (0);
162 cb->sock_fd = socket (AF_INET, SOCK_STREAM, 0);
163 if (cb->sock_fd < 0)
164 {
165 ERROR ("write_graphite plugin: socket failed: %s", strerror (errno));
166 return (-1);
167 }
168 cb->server = gethostbyname(cb->host);
169 if (cb->server == NULL)
170 {
171 ERROR ("write_graphite plugin: no such host");
172 return (-1);
173 }
174 memset (&serv_addr, 0, sizeof (serv_addr));
175 serv_addr.sin_family = AF_INET;
176 memcpy (&serv_addr.sin_addr.s_addr,
177 cb->server->h_addr,
178 cb->server->h_length);
179 serv_addr.sin_port = htons(cb->port);
181 status = connect(cb->sock_fd,
182 (struct sockaddr *) &serv_addr,
183 sizeof(serv_addr));
184 if (status < 0)
185 {
186 char errbuf[1024];
187 sstrerror (errno, errbuf, sizeof (errbuf));
188 ERROR ("write_graphite plugin: connect failed: %s", errbuf);
189 close (cb->sock_fd);
190 cb->sock_fd = -1;
191 return (-1);
192 }
194 wg_reset_buffer (cb);
196 return (0);
197 }
199 static void wg_callback_free (void *data)
200 {
201 struct wg_callback *cb;
203 if (data == NULL)
204 return;
206 cb = data;
208 wg_flush_nolock (/* timeout = */ 0, cb);
210 close(cb->sock_fd);
211 sfree(cb->host);
212 sfree(cb->prefix);
214 sfree(cb);
215 }
217 static int wg_flush (cdtime_t timeout,
218 const char *identifier __attribute__((unused)),
219 user_data_t *user_data)
220 {
221 struct wg_callback *cb;
222 int status;
224 if (user_data == NULL)
225 return (-EINVAL);
227 cb = user_data->data;
229 pthread_mutex_lock (&cb->send_lock);
231 if (cb->sock_fd < 0)
232 {
233 status = wg_callback_init (cb);
234 if (status != 0)
235 {
236 ERROR ("write_graphite plugin: wg_callback_init failed.");
237 pthread_mutex_unlock (&cb->send_lock);
238 return (-1);
239 }
240 }
242 status = wg_flush_nolock (timeout, cb);
243 pthread_mutex_unlock (&cb->send_lock);
245 return (status);
246 }
248 static int wg_format_values (char *ret, size_t ret_len,
249 int ds_num, const data_set_t *ds, const value_list_t *vl,
250 _Bool store_rates)
251 {
252 size_t offset = 0;
253 int status;
254 gauge_t *rates = NULL;
256 assert (0 == strcmp (ds->type, vl->type));
258 memset (ret, 0, ret_len);
260 #define BUFFER_ADD(...) do { \
261 status = ssnprintf (ret + offset, ret_len - offset, \
262 __VA_ARGS__); \
263 if (status < 1) \
264 { \
265 sfree (rates); \
266 return (-1); \
267 } \
268 else if (((size_t) status) >= (ret_len - offset)) \
269 { \
270 sfree (rates); \
271 return (-1); \
272 } \
273 else \
274 offset += ((size_t) status); \
275 } while (0)
277 if (ds->ds[ds_num].type == DS_TYPE_GAUGE)
278 BUFFER_ADD ("%f", vl->values[ds_num].gauge);
279 else if (store_rates)
280 {
281 if (rates == NULL)
282 rates = uc_get_rate (ds, vl);
283 if (rates == NULL)
284 {
285 WARNING ("format_values: "
286 "uc_get_rate failed.");
287 return (-1);
288 }
289 BUFFER_ADD ("%g", rates[ds_num]);
290 }
291 else if (ds->ds[ds_num].type == DS_TYPE_COUNTER)
292 BUFFER_ADD ("%llu", vl->values[ds_num].counter);
293 else if (ds->ds[ds_num].type == DS_TYPE_DERIVE)
294 BUFFER_ADD ("%"PRIi64, vl->values[ds_num].derive);
295 else if (ds->ds[ds_num].type == DS_TYPE_ABSOLUTE)
296 BUFFER_ADD ("%"PRIu64, vl->values[ds_num].absolute);
297 else
298 {
299 ERROR ("format_values plugin: Unknown data source type: %i",
300 ds->ds[ds_num].type);
301 sfree (rates);
302 return (-1);
303 }
305 #undef BUFFER_ADD
307 sfree (rates);
308 return (0);
309 }
311 static int mangle_dots (char *dst, const char *src)
312 {
313 size_t i;
315 int reps = 0;
317 for (i = 0; i < strlen(src) ; i++)
318 {
319 if (src[i] == '.')
320 {
321 dst[i] = '_';
322 ++reps;
323 }
324 else
325 dst[i] = src[i];
326 }
327 dst[i] = '\0';
329 return reps;
330 }
332 static int wg_format_name (char *ret, int ret_len,
333 const char *hostname,
334 const char *plugin, const char *plugin_instance,
335 const char *type, const char *type_instance,
336 const char *prefix, const char *ds_name)
337 {
338 int status;
339 char *n_hostname = 0;
340 char *n_ds_name = 0;
342 assert (plugin != NULL);
343 assert (type != NULL);
345 if ((n_hostname = malloc(strlen(hostname)+1)) == NULL)
346 {
347 ERROR ("Unable to allocate memory for normalized hostname buffer");
348 return (-1);
349 }
351 if (mangle_dots(n_hostname, hostname) == -1)
352 {
353 ERROR ("Unable to normalize hostname");
354 return (-1);
355 }
357 if (ds_name && ds_name[0] != '\0') {
358 if (mangle_dots(n_ds_name, ds_name) == -1)
359 {
360 ERROR ("Unable to normalize datasource name");
361 return (-1);
362 }
363 }
365 if ((plugin_instance == NULL) || (plugin_instance[0] == '\0'))
366 {
367 if ((type_instance == NULL) || (type_instance[0] == '\0'))
368 {
369 if ((ds_name == NULL) || (ds_name[0] == '\0'))
370 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s",
371 prefix, n_hostname, plugin, type);
372 else
373 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s.%s",
374 prefix, n_hostname, plugin, type, n_ds_name);
375 }
376 else
377 {
378 if ((ds_name == NULL) || (ds_name[0] == '\0'))
379 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s-%s",
380 prefix, n_hostname, plugin, type,
381 type_instance);
382 else
383 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s-%s.%s",
384 prefix, n_hostname, plugin, type,
385 type_instance, n_ds_name);
386 }
387 }
388 else
389 {
390 if ((type_instance == NULL) || (type_instance[0] == '\0'))
391 {
392 if ((ds_name == NULL) || (ds_name[0] == '\0'))
393 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s.%s",
394 prefix, n_hostname, plugin,
395 plugin_instance, type);
396 else
397 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s.%s.%s",
398 prefix, n_hostname, plugin,
399 plugin_instance, type, n_ds_name);
400 }
401 else
402 {
403 if ((ds_name == NULL) || (ds_name[0] == '\0'))
404 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s.%s-%s",
405 prefix, n_hostname, plugin,
406 plugin_instance, type, type_instance);
407 else
408 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s.%s-%s.%s",
409 prefix, n_hostname, plugin,
410 plugin_instance, type, type_instance, n_ds_name);
411 }
412 }
414 sfree(n_hostname);
415 sfree(n_ds_name);
417 if ((status < 1) || (status >= ret_len))
418 return (-1);
419 return (0);
420 }
422 static int wg_send_message (const char* key, const char* value,
423 cdtime_t time, struct wg_callback *cb)
424 {
425 int status;
426 size_t message_len;
427 char message[1024];
429 message_len = (size_t) ssnprintf (message, sizeof (message),
430 "%s %s %.0f\n",
431 key,
432 value,
433 CDTIME_T_TO_DOUBLE(time));
434 if (message_len >= sizeof (message)) {
435 ERROR ("write_graphite plugin: message buffer too small: "
436 "Need %zu bytes.", message_len + 1);
437 return (-1);
438 }
441 pthread_mutex_lock (&cb->send_lock);
443 if (cb->sock_fd < 0)
444 {
445 status = wg_callback_init (cb);
446 if (status != 0)
447 {
448 ERROR ("write_graphite plugin: wg_callback_init failed.");
449 pthread_mutex_unlock (&cb->send_lock);
450 return (-1);
451 }
452 }
454 if (message_len >= cb->send_buf_free)
455 {
456 status = wg_flush_nolock (/* timeout = */ 0, cb);
457 if (status != 0)
458 {
459 pthread_mutex_unlock (&cb->send_lock);
460 return (status);
461 }
462 }
463 assert (message_len < cb->send_buf_free);
465 /* `message_len + 1' because `message_len' does not include the
466 * trailing null byte. Neither does `send_buffer_fill'. */
467 memcpy (cb->send_buf + cb->send_buf_fill,
468 message, message_len + 1);
469 cb->send_buf_fill += message_len;
470 cb->send_buf_free -= message_len;
472 DEBUG ("write_graphite plugin: <%s:%d> buf %zu/%zu (%g%%) \"%s\"",
473 cb->host,
474 cb->port,
475 cb->send_buf_fill, sizeof (cb->send_buf),
476 100.0 * ((double) cb->send_buf_fill) / ((double) sizeof (cb->send_buf)),
477 message);
479 /* Check if we have enough space for this message. */
480 pthread_mutex_unlock (&cb->send_lock);
482 return (0);
483 }
485 static int wg_write_messages (const data_set_t *ds, const value_list_t *vl,
486 struct wg_callback *cb)
487 {
488 char key[10*DATA_MAX_NAME_LEN];
489 char values[512];
491 int status, i;
493 if (0 != strcmp (ds->type, vl->type))
494 {
495 ERROR ("write_graphite plugin: DS type does not match "
496 "value list type");
497 return -1;
498 }
500 if (ds->ds_num > 1)
501 {
502 for (i = 0; i < ds->ds_num; i++)
503 {
504 /* Copy the identifier to `key' and escape it. */
505 status = WG_FORMAT_NAME (key, sizeof (key), vl, cb->prefix, \
506 ds->ds[i].name);
507 if (status != 0)
508 {
509 ERROR ("write_graphite plugin: error with format_name");
510 return (status);
511 }
513 escape_string (key, sizeof (key));
514 /* Convert the values to an ASCII representation and put that
515 * into `values'. */
516 status = wg_format_values (values, sizeof (values), i, ds, vl, 0);
517 if (status != 0)
518 {
519 ERROR ("write_graphite plugin: error with "
520 "wg_format_values");
521 return (status);
522 }
524 /* Send the message to graphite */
525 status = wg_send_message (key, values, vl->time, cb);
526 if (status != 0)
527 {
528 ERROR ("write_graphite plugin: error with "
529 "wg_send_message");
530 return (status);
531 }
532 }
533 }
534 else
535 {
536 /* Copy the identifier to `key' and escape it. */
537 status = WG_FORMAT_NAME (key, sizeof (key), vl, cb->prefix, NULL);
538 if (status != 0)
539 {
540 ERROR ("write_graphite plugin: error with format_name");
541 return (status);
542 }
544 escape_string (key, sizeof (key));
545 /* Convert the values to an ASCII representation and put that into
546 * `values'. */
547 status = wg_format_values (values, sizeof (values), 0, ds, vl, 0);
548 if (status != 0)
549 {
550 ERROR ("write_graphite plugin: error with "
551 "wg_format_values");
552 return (status);
553 }
555 /* Send the message to graphite */
556 status = wg_send_message (key, values, vl->time, cb);
557 if (status != 0)
558 {
559 ERROR ("write_graphite plugin: error with "
560 "wg_send_message");
561 return (status);
562 }
563 }
565 return (0);
566 }
568 static int wg_write (const data_set_t *ds, const value_list_t *vl,
569 user_data_t *user_data)
570 {
571 struct wg_callback *cb;
572 int status;
574 if (user_data == NULL)
575 return (-EINVAL);
577 cb = user_data->data;
579 status = wg_write_messages (ds, vl, cb);
581 return (status);
582 }
584 static int config_set_number (int *dest,
585 oconfig_item_t *ci)
586 {
587 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
588 {
589 WARNING ("write_graphite plugin: The `%s' config option "
590 "needs exactly one numeric argument.", ci->key);
591 return (-1);
592 }
594 *dest = ci->values[0].value.number;
596 return (0);
597 }
599 static int config_set_string (char **ret_string,
600 oconfig_item_t *ci)
601 {
602 char *string;
604 if ((ci->values_num != 1)
605 || (ci->values[0].type != OCONFIG_TYPE_STRING))
606 {
607 WARNING ("write_graphite plugin: The `%s' config option "
608 "needs exactly one string argument.", ci->key);
609 return (-1);
610 }
612 string = strdup (ci->values[0].value.string);
613 if (string == NULL)
614 {
615 ERROR ("write_graphite plugin: strdup failed.");
616 return (-1);
617 }
619 if (*ret_string != NULL)
620 sfree (*ret_string);
621 *ret_string = string;
623 return (0);
624 }
626 static int wg_config_carbon (oconfig_item_t *ci)
627 {
628 struct wg_callback *cb;
629 user_data_t user_data;
630 int i;
632 cb = malloc (sizeof (*cb));
633 if (cb == NULL)
634 {
635 ERROR ("write_graphite plugin: malloc failed.");
636 return (-1);
637 }
638 memset (cb, 0, sizeof (*cb));
639 cb->sock_fd = -1;
640 cb->host = NULL;
641 cb->port = 2003;
642 cb->prefix = NULL;
643 cb->server = NULL;
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 config_set_string (&cb->host, child);
653 else if (strcasecmp ("Port", child->key) == 0)
654 config_set_number (&cb->port, child);
655 else if (strcasecmp ("Prefix", child->key) == 0)
656 config_set_string (&cb->prefix, child);
657 else
658 {
659 ERROR ("write_graphite plugin: Invalid configuration "
660 "option: %s.", child->key);
661 }
662 }
664 DEBUG ("write_graphite: Registering write callback to carbon agent "
665 "%s:%d", cb->host, cb->port);
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 : */