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 "local-agent">
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 char *name;
71 int sock_fd;
72 struct hostent *server;
74 char *host;
75 int port;
76 char *prefix;
78 char send_buf[WG_SEND_BUF_SIZE];
79 size_t send_buf_free;
80 size_t send_buf_fill;
81 cdtime_t send_buf_init_time;
83 pthread_mutex_t send_lock;
84 };
87 /*
88 * Functions
89 */
90 static void wg_reset_buffer (struct wg_callback *cb)
91 {
92 memset (cb->send_buf, 0, sizeof (cb->send_buf));
93 cb->send_buf_free = sizeof (cb->send_buf);
94 cb->send_buf_fill = 0;
95 cb->send_buf_init_time = cdtime ();
96 }
98 static int wg_send_buffer (struct wg_callback *cb)
99 {
100 int status = 0;
102 status = write (cb->sock_fd, cb->send_buf, strlen (cb->send_buf));
103 if (status < 0)
104 {
105 ERROR ("write_graphite plugin: send failed with "
106 "status %i (%s)",
107 status,
108 strerror (errno));
110 pthread_mutex_lock (&cb->send_lock);
112 DEBUG ("write_graphite plugin: closing socket and restting fd "
113 "so reinit will occur");
114 close (cb->sock_fd);
115 cb->sock_fd = -1;
117 pthread_mutex_unlock (&cb->send_lock);
119 return (-1);
120 }
121 return (0);
122 }
124 static int wg_flush_nolock (cdtime_t timeout, struct wg_callback *cb)
125 {
126 int status;
128 DEBUG ("write_graphite plugin: wg_flush_nolock: timeout = %.3f; "
129 "send_buf_fill = %zu;",
130 (double)timeout,
131 cb->send_buf_fill);
133 /* timeout == 0 => flush unconditionally */
134 if (timeout > 0)
135 {
136 cdtime_t now;
138 now = cdtime ();
139 if ((cb->send_buf_init_time + timeout) > now)
140 return (0);
141 }
143 if (cb->send_buf_fill <= 0)
144 {
145 cb->send_buf_init_time = cdtime ();
146 return (0);
147 }
149 status = wg_send_buffer (cb);
150 wg_reset_buffer (cb);
152 return (status);
153 }
155 static int wg_callback_init (struct wg_callback *cb)
156 {
157 int status;
159 struct sockaddr_in serv_addr;
161 if (cb->sock_fd > 0)
162 return (0);
164 cb->sock_fd = socket (AF_INET, SOCK_STREAM, 0);
165 if (cb->sock_fd < 0)
166 {
167 ERROR ("write_graphite plugin: socket failed: %s", strerror (errno));
168 return (-1);
169 }
170 cb->server = gethostbyname(cb->host);
171 if (cb->server == NULL)
172 {
173 ERROR ("write_graphite plugin: no such host");
174 return (-1);
175 }
176 memset (&serv_addr, 0, sizeof (serv_addr));
177 serv_addr.sin_family = AF_INET;
178 memcpy (&serv_addr.sin_addr.s_addr,
179 cb->server->h_addr,
180 cb->server->h_length);
181 serv_addr.sin_port = htons(cb->port);
183 status = connect(cb->sock_fd,
184 (struct sockaddr *) &serv_addr,
185 sizeof(serv_addr));
186 if (status < 0)
187 {
188 char errbuf[1024];
189 sstrerror (errno, errbuf, sizeof (errbuf));
190 ERROR ("write_graphite plugin: connect failed: %s", errbuf);
191 close (cb->sock_fd);
192 cb->sock_fd = -1;
193 return (-1);
194 }
196 wg_reset_buffer (cb);
198 return (0);
199 }
201 static void wg_callback_free (void *data)
202 {
203 struct wg_callback *cb;
205 if (data == NULL)
206 return;
208 cb = data;
210 wg_flush_nolock (/* timeout = */ 0, cb);
212 close(cb->sock_fd);
213 sfree(cb->name);
214 sfree(cb->host);
215 sfree(cb->prefix);
217 sfree(cb);
218 }
220 static int wg_flush (cdtime_t timeout,
221 const char *identifier __attribute__((unused)),
222 user_data_t *user_data)
223 {
224 struct wg_callback *cb;
225 int status;
227 if (user_data == NULL)
228 return (-EINVAL);
230 cb = user_data->data;
232 pthread_mutex_lock (&cb->send_lock);
234 if (cb->sock_fd < 0)
235 {
236 status = wg_callback_init (cb);
237 if (status != 0)
238 {
239 ERROR ("write_graphite plugin: wg_callback_init failed.");
240 pthread_mutex_unlock (&cb->send_lock);
241 return (-1);
242 }
243 }
245 status = wg_flush_nolock (timeout, cb);
246 pthread_mutex_unlock (&cb->send_lock);
248 return (status);
249 }
251 static int wg_format_values (char *ret, size_t ret_len,
252 int ds_num, const data_set_t *ds, const value_list_t *vl,
253 _Bool store_rates)
254 {
255 size_t offset = 0;
256 int status;
257 gauge_t *rates = NULL;
259 assert (0 == strcmp (ds->type, vl->type));
261 memset (ret, 0, ret_len);
263 #define BUFFER_ADD(...) do { \
264 status = ssnprintf (ret + offset, ret_len - offset, \
265 __VA_ARGS__); \
266 if (status < 1) \
267 { \
268 sfree (rates); \
269 return (-1); \
270 } \
271 else if (((size_t) status) >= (ret_len - offset)) \
272 { \
273 sfree (rates); \
274 return (-1); \
275 } \
276 else \
277 offset += ((size_t) status); \
278 } while (0)
280 if (ds->ds[ds_num].type == DS_TYPE_GAUGE)
281 BUFFER_ADD ("%f", vl->values[ds_num].gauge);
282 else if (store_rates)
283 {
284 if (rates == NULL)
285 rates = uc_get_rate (ds, vl);
286 if (rates == NULL)
287 {
288 WARNING ("format_values: "
289 "uc_get_rate failed.");
290 return (-1);
291 }
292 BUFFER_ADD ("%g", rates[ds_num]);
293 }
294 else if (ds->ds[ds_num].type == DS_TYPE_COUNTER)
295 BUFFER_ADD ("%llu", vl->values[ds_num].counter);
296 else if (ds->ds[ds_num].type == DS_TYPE_DERIVE)
297 BUFFER_ADD ("%"PRIi64, vl->values[ds_num].derive);
298 else if (ds->ds[ds_num].type == DS_TYPE_ABSOLUTE)
299 BUFFER_ADD ("%"PRIu64, vl->values[ds_num].absolute);
300 else
301 {
302 ERROR ("format_values plugin: Unknown data source type: %i",
303 ds->ds[ds_num].type);
304 sfree (rates);
305 return (-1);
306 }
308 #undef BUFFER_ADD
310 sfree (rates);
311 return (0);
312 }
314 static int normalize_hostname (char *dst, const char *src)
315 {
316 size_t i;
318 int reps = 0;
320 for (i = 0; i < strlen(src) ; i++)
321 {
322 if (src[i] == '.')
323 {
324 dst[i] = '_';
325 ++reps;
326 }
327 else
328 dst[i] = src[i];
329 }
330 dst[i] = '\0';
332 return reps;
333 }
335 static int wg_format_name (char *ret, int ret_len,
336 const char *hostname,
337 const char *plugin, const char *plugin_instance,
338 const char *type, const char *type_instance,
339 const char *prefix, const char *ds_name)
340 {
341 int status;
342 char *n_hostname;
344 assert (plugin != NULL);
345 assert (type != NULL);
347 if ((n_hostname = malloc(strlen(hostname)+1)) == NULL)
348 {
349 ERROR ("Unable to allocate memory for normalized hostname buffer");
350 return (-1);
351 }
353 if (normalize_hostname(n_hostname, hostname) == -1)
354 {
355 ERROR ("Unable to normalize hostname");
356 return (-1);
357 }
359 if ((plugin_instance == NULL) || (plugin_instance[0] == '\0'))
360 {
361 if ((type_instance == NULL) || (type_instance[0] == '\0'))
362 {
363 if ((ds_name == NULL) || (ds_name[0] == '\0'))
364 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s",
365 prefix, n_hostname, plugin, type);
366 else
367 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s.%s",
368 prefix, n_hostname, plugin, type, ds_name);
369 }
370 else
371 {
372 if ((ds_name == NULL) || (ds_name[0] == '\0'))
373 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s-%s",
374 prefix, n_hostname, plugin, type,
375 type_instance);
376 else
377 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s-%s.%s",
378 prefix, n_hostname, plugin, type,
379 type_instance, ds_name);
380 }
381 }
382 else
383 {
384 if ((type_instance == NULL) || (type_instance[0] == '\0'))
385 {
386 if ((ds_name == NULL) || (ds_name[0] == '\0'))
387 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s.%s",
388 prefix, n_hostname, plugin,
389 plugin_instance, type);
390 else
391 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s.%s.%s",
392 prefix, n_hostname, plugin,
393 plugin_instance, type, ds_name);
394 }
395 else
396 {
397 if ((ds_name == NULL) || (ds_name[0] == '\0'))
398 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s.%s-%s",
399 prefix, n_hostname, plugin,
400 plugin_instance, type, type_instance);
401 else
402 status = ssnprintf (ret, ret_len, "%s.%s.%s.%s.%s-%s.%s",
403 prefix, n_hostname, plugin,
404 plugin_instance, type, type_instance, ds_name);
405 }
406 }
408 sfree(n_hostname);
410 if ((status < 1) || (status >= ret_len))
411 return (-1);
412 return (0);
413 }
415 static int wg_send_message (const char* key, const char* value,
416 cdtime_t time, struct wg_callback *cb)
417 {
418 int status;
419 size_t message_len;
420 char message[1024];
422 message_len = (size_t) ssnprintf (message, sizeof (message),
423 "%s %s %.0f\n",
424 key,
425 value,
426 CDTIME_T_TO_DOUBLE(time));
427 if (message_len >= sizeof (message)) {
428 ERROR ("write_graphite plugin: message buffer too small: "
429 "Need %zu bytes.", message_len + 1);
430 return (-1);
431 }
434 pthread_mutex_lock (&cb->send_lock);
436 if (cb->sock_fd < 0)
437 {
438 status = wg_callback_init (cb);
439 if (status != 0)
440 {
441 ERROR ("write_graphite plugin: wg_callback_init failed.");
442 pthread_mutex_unlock (&cb->send_lock);
443 return (-1);
444 }
445 }
447 if (message_len >= cb->send_buf_free)
448 {
449 status = wg_flush_nolock (/* timeout = */ 0, cb);
450 if (status != 0)
451 {
452 pthread_mutex_unlock (&cb->send_lock);
453 return (status);
454 }
455 }
456 assert (message_len < cb->send_buf_free);
458 /* `message_len + 1' because `message_len' does not include the
459 * trailing null byte. Neither does `send_buffer_fill'. */
460 memcpy (cb->send_buf + cb->send_buf_fill,
461 message, message_len + 1);
462 cb->send_buf_fill += message_len;
463 cb->send_buf_free -= message_len;
465 DEBUG ("write_graphite plugin: <%s:%d> buf %zu/%zu (%g%%) \"%s\"",
466 cb->host,
467 cb->port,
468 cb->send_buf_fill, sizeof (cb->send_buf),
469 100.0 * ((double) cb->send_buf_fill) / ((double) sizeof (cb->send_buf)),
470 message);
472 /* Check if we have enough space for this message. */
473 pthread_mutex_unlock (&cb->send_lock);
475 return (0);
476 }
478 static int wg_write_messages (const data_set_t *ds, const value_list_t *vl,
479 struct wg_callback *cb)
480 {
481 char key[10*DATA_MAX_NAME_LEN];
482 char values[512];
484 int status, i;
486 if (0 != strcmp (ds->type, vl->type))
487 {
488 ERROR ("write_graphite plugin: DS type does not match "
489 "value list type");
490 return -1;
491 }
493 if (ds->ds_num > 1)
494 {
495 for (i = 0; i < ds->ds_num; i++)
496 {
497 /* Copy the identifier to `key' and escape it. */
498 status = WG_FORMAT_NAME (key, sizeof (key), vl, cb->prefix, \
499 ds->ds[i].name);
500 if (status != 0)
501 {
502 ERROR ("write_graphite plugin: error with format_name");
503 return (status);
504 }
506 escape_string (key, sizeof (key));
507 /* Convert the values to an ASCII representation and put that
508 * into `values'. */
509 status = wg_format_values (values, sizeof (values), i, ds, vl, 0);
510 if (status != 0)
511 {
512 ERROR ("write_graphite plugin: error with "
513 "wg_format_values");
514 return (status);
515 }
517 /* Send the message to graphite */
518 status = wg_send_message (key, values, vl->time, cb);
519 if (status != 0)
520 {
521 ERROR ("write_graphite plugin: error with "
522 "wg_send_message");
523 return (status);
524 }
525 }
526 }
527 else
528 {
529 /* Copy the identifier to `key' and escape it. */
530 status = WG_FORMAT_NAME (key, sizeof (key), vl, cb->prefix, NULL);
531 if (status != 0)
532 {
533 ERROR ("write_graphite plugin: error with format_name");
534 return (status);
535 }
537 escape_string (key, sizeof (key));
538 /* Convert the values to an ASCII representation and put that into
539 * `values'. */
540 status = wg_format_values (values, sizeof (values), 0, ds, vl, 0);
541 if (status != 0)
542 {
543 ERROR ("write_graphite plugin: error with "
544 "wg_format_values");
545 return (status);
546 }
548 /* Send the message to graphite */
549 status = wg_send_message (key, values, vl->time, cb);
550 if (status != 0)
551 {
552 ERROR ("write_graphite plugin: error with "
553 "wg_send_message");
554 return (status);
555 }
556 }
558 return (0);
559 }
561 static int wg_write (const data_set_t *ds, const value_list_t *vl,
562 user_data_t *user_data)
563 {
564 struct wg_callback *cb;
565 int status;
567 if (user_data == NULL)
568 return (-EINVAL);
570 cb = user_data->data;
572 status = wg_write_messages (ds, vl, cb);
574 return (status);
575 }
577 static int config_set_number (int *dest,
578 oconfig_item_t *ci)
579 {
580 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
581 {
582 WARNING ("write_graphite plugin: The `%s' config option "
583 "needs exactly one numeric argument.", ci->key);
584 return (-1);
585 }
587 *dest = ci->values[0].value.number;
589 return (0);
590 }
592 static int config_set_string (char **ret_string,
593 oconfig_item_t *ci)
594 {
595 char *string;
597 if ((ci->values_num != 1)
598 || (ci->values[0].type != OCONFIG_TYPE_STRING))
599 {
600 WARNING ("write_graphite plugin: The `%s' config option "
601 "needs exactly one string argument.", ci->key);
602 return (-1);
603 }
605 string = strdup (ci->values[0].value.string);
606 if (string == NULL)
607 {
608 ERROR ("write_graphite plugin: strdup failed.");
609 return (-1);
610 }
612 if (*ret_string != NULL)
613 sfree (*ret_string);
614 *ret_string = string;
616 return (0);
617 }
619 static int wg_config_carbon (oconfig_item_t *ci)
620 {
621 struct wg_callback *cb;
622 user_data_t user_data;
623 int i;
625 cb = malloc (sizeof (*cb));
626 if (cb == NULL)
627 {
628 ERROR ("write_graphite plugin: malloc failed.");
629 return (-1);
630 }
631 memset (cb, 0, sizeof (*cb));
632 cb->sock_fd = -1;
633 cb->host = NULL;
634 cb->name = NULL;
635 cb->port = 2003;
636 cb->prefix = NULL;
637 cb->server = NULL;
639 pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
641 config_set_string (&cb->name, ci);
642 if (cb->name == NULL)
643 return (-1);
645 for (i = 0; i < ci->children_num; i++)
646 {
647 oconfig_item_t *child = ci->children + i;
649 if (strcasecmp ("Host", child->key) == 0)
650 config_set_string (&cb->host, child);
651 else if (strcasecmp ("Port", child->key) == 0)
652 config_set_number (&cb->port, child);
653 else if (strcasecmp ("Prefix", child->key) == 0)
654 config_set_string (&cb->prefix, child);
655 else
656 {
657 ERROR ("write_graphite plugin: Invalid configuration "
658 "option: %s.", child->key);
659 }
660 }
662 DEBUG ("write_graphite: Registering write callback to carbon agent "
663 "%s:%d", cb->host, cb->port);
665 memset (&user_data, 0, sizeof (user_data));
666 user_data.data = cb;
667 user_data.free_func = NULL;
668 plugin_register_flush ("write_graphite", wg_flush, &user_data);
670 user_data.free_func = wg_callback_free;
671 plugin_register_write ("write_graphite", wg_write, &user_data);
673 return (0);
674 }
676 static int wg_config (oconfig_item_t *ci)
677 {
678 int i;
680 for (i = 0; i < ci->children_num; i++)
681 {
682 oconfig_item_t *child = ci->children + i;
684 if (strcasecmp ("Carbon", child->key) == 0)
685 wg_config_carbon (child);
686 else
687 {
688 ERROR ("write_graphite plugin: Invalid configuration "
689 "option: %s.", child->key);
690 }
691 }
693 return (0);
694 }
696 void module_register (void)
697 {
698 plugin_register_complex_config ("write_graphite", wg_config);
699 }
701 /* vim: set sw=4 ts=4 sts=4 tw=78 et : */