2 * collectd - src/write_graphite.c
3 * Copyright (C) 2011 Scott Sanders
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.
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.
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
19 * Scott Sanders <scott@jssjr.com>
21 * based on the excellent write_http plugin
24 /* write_graphite plugin configuation example
26 * <Plugin write_graphite>
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. */
46 #include <sys/socket.h>
48 #include <sys/types.h>
50 #include <netinet/in.h>
53 #ifndef WG_FORMAT_NAME
54 #define WG_FORMAT_NAME(ret, ret_len, vl, cb, name) \
55 wg_format_name (ret, ret_len, (vl)->host, (vl)->plugin, \
56 (vl)->plugin_instance, (vl)->type, \
57 (vl)->type_instance, (cb)->prefix, (cb)->postfix, \
61 #ifndef WG_DEFAULT_NODE
62 # define WG_DEFAULT_NODE "localhost"
65 #ifndef WG_DEFAULT_SERVICE
66 # define WG_DEFAULT_SERVICE "2003"
69 #ifndef WG_SEND_BUF_SIZE
70 # define WG_SEND_BUF_SIZE 4096
79 struct hostent *server;
87 char send_buf[WG_SEND_BUF_SIZE];
90 cdtime_t send_buf_init_time;
92 pthread_mutex_t send_lock;
99 static void wg_reset_buffer (struct wg_callback *cb)
101 memset (cb->send_buf, 0, sizeof (cb->send_buf));
102 cb->send_buf_free = sizeof (cb->send_buf);
103 cb->send_buf_fill = 0;
104 cb->send_buf_init_time = cdtime ();
107 static int wg_send_buffer (struct wg_callback *cb)
111 status = write (cb->sock_fd, cb->send_buf, strlen (cb->send_buf));
114 ERROR ("write_graphite plugin: send failed with "
119 pthread_mutex_trylock (&cb->send_lock);
121 DEBUG ("write_graphite plugin: closing socket and restting fd "
122 "so reinit will occur");
126 pthread_mutex_unlock (&cb->send_lock);
133 static int wg_flush_nolock (cdtime_t timeout, struct wg_callback *cb)
137 DEBUG ("write_graphite plugin: wg_flush_nolock: timeout = %.3f; "
138 "send_buf_fill = %zu;",
142 /* timeout == 0 => flush unconditionally */
148 if ((cb->send_buf_init_time + timeout) > now)
152 if (cb->send_buf_fill <= 0)
154 cb->send_buf_init_time = cdtime ();
158 status = wg_send_buffer (cb);
159 wg_reset_buffer (cb);
164 static int wg_callback_init (struct wg_callback *cb)
166 struct addrinfo ai_hints;
167 struct addrinfo *ai_list;
168 struct addrinfo *ai_ptr;
171 const char *node = cb->node ? cb->node : WG_DEFAULT_NODE;
172 const char *service = cb->service ? cb->service : WG_DEFAULT_SERVICE;
177 memset (&ai_hints, 0, sizeof (ai_hints));
179 ai_hints.ai_flags |= AI_ADDRCONFIG;
181 ai_hints.ai_family = AF_UNSPEC;
182 ai_hints.ai_socktype = SOCK_STREAM;
186 status = getaddrinfo (node, service, &ai_hints, &ai_list);
189 ERROR ("write_graphite plugin: getaddrinfo (%s, %s) failed: %s",
190 node, service, gai_strerror (status));
194 assert (ai_list != NULL);
195 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
197 cb->sock_fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
198 ai_ptr->ai_protocol);
202 status = connect (cb->sock_fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
213 freeaddrinfo (ai_list);
218 ERROR ("write_graphite plugin: Connecting to %s:%s failed. "
219 "The last error was: %s", node, service,
220 sstrerror (errno, errbuf, sizeof (errbuf)));
225 wg_reset_buffer (cb);
230 static void wg_callback_free (void *data)
232 struct wg_callback *cb;
239 wg_flush_nolock (/* timeout = */ 0, cb);
250 static int wg_flush (cdtime_t timeout,
251 const char *identifier __attribute__((unused)),
252 user_data_t *user_data)
254 struct wg_callback *cb;
257 if (user_data == NULL)
260 cb = user_data->data;
262 pthread_mutex_lock (&cb->send_lock);
266 status = wg_callback_init (cb);
269 ERROR ("write_graphite plugin: wg_callback_init failed.");
270 pthread_mutex_unlock (&cb->send_lock);
275 status = wg_flush_nolock (timeout, cb);
276 pthread_mutex_unlock (&cb->send_lock);
281 static int wg_format_values (char *ret, size_t ret_len,
282 int ds_num, const data_set_t *ds, const value_list_t *vl,
287 gauge_t *rates = NULL;
289 assert (0 == strcmp (ds->type, vl->type));
291 memset (ret, 0, ret_len);
293 #define BUFFER_ADD(...) do { \
294 status = ssnprintf (ret + offset, ret_len - offset, \
301 else if (((size_t) status) >= (ret_len - offset)) \
307 offset += ((size_t) status); \
310 if (ds->ds[ds_num].type == DS_TYPE_GAUGE)
311 BUFFER_ADD ("%f", vl->values[ds_num].gauge);
312 else if (store_rates)
315 rates = uc_get_rate (ds, vl);
318 WARNING ("format_values: "
319 "uc_get_rate failed.");
322 BUFFER_ADD ("%g", rates[ds_num]);
324 else if (ds->ds[ds_num].type == DS_TYPE_COUNTER)
325 BUFFER_ADD ("%llu", vl->values[ds_num].counter);
326 else if (ds->ds[ds_num].type == DS_TYPE_DERIVE)
327 BUFFER_ADD ("%"PRIi64, vl->values[ds_num].derive);
328 else if (ds->ds[ds_num].type == DS_TYPE_ABSOLUTE)
329 BUFFER_ADD ("%"PRIu64, vl->values[ds_num].absolute);
332 ERROR ("format_values plugin: Unknown data source type: %i",
333 ds->ds[ds_num].type);
344 static int swap_chars (char *dst, const char *src,
345 const char from, const char to)
351 for (i = 0; i < strlen(src) ; i++)
366 static int wg_format_name (char *ret, int ret_len,
367 const char *hostname,
368 const char *plugin, const char *plugin_instance,
369 const char *type, const char *type_instance,
370 const char *prefix, const char *postfix,
371 const char *ds_name, const char dotchar)
374 char *n_hostname = 0;
375 char *n_type_instance = 0;
377 assert (plugin != NULL);
378 assert (type != NULL);
386 if ((n_hostname = malloc(strlen(hostname)+1)) == NULL)
388 ERROR ("Unable to allocate memory for normalized hostname buffer");
392 if (swap_chars(n_hostname, hostname, '.', dotchar) == -1)
394 ERROR ("Unable to normalize hostname");
398 if (type_instance && type_instance[0] != '\0') {
399 if ((n_type_instance = malloc(strlen(type_instance)+1)) == NULL)
401 ERROR ("Unable to allocate memory for normalized datasource name buffer");
404 if (swap_chars(n_type_instance, type_instance, '.', dotchar) == -1)
406 ERROR ("Unable to normalize datasource name");
411 if ((plugin_instance == NULL) || (plugin_instance[0] == '\0'))
413 if ((n_type_instance == NULL) || (n_type_instance[0] == '\0'))
415 if ((ds_name == NULL) || (ds_name[0] == '\0'))
416 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s",
417 prefix, n_hostname, postfix, plugin, type);
419 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s.%s",
420 prefix, n_hostname, postfix, plugin, type, ds_name);
424 if ((ds_name == NULL) || (ds_name[0] == '\0'))
425 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s-%s",
426 prefix, n_hostname, postfix, plugin, type,
429 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s-%s.%s",
430 prefix, n_hostname, postfix, plugin, type,
431 n_type_instance, ds_name);
436 if ((n_type_instance == NULL) || (n_type_instance[0] == '\0'))
438 if ((ds_name == NULL) || (ds_name[0] == '\0'))
439 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s.%s",
440 prefix, n_hostname, postfix, plugin,
441 plugin_instance, type);
443 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s.%s.%s",
444 prefix, n_hostname, postfix, plugin,
445 plugin_instance, type, ds_name);
449 if ((ds_name == NULL) || (ds_name[0] == '\0'))
450 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s.%s-%s",
451 prefix, n_hostname, postfix, plugin,
452 plugin_instance, type, n_type_instance);
454 status = ssnprintf (ret, ret_len, "%s%s%s.%s.%s.%s-%s.%s",
455 prefix, n_hostname, postfix, plugin,
456 plugin_instance, type, n_type_instance, ds_name);
461 sfree(n_type_instance);
463 if ((status < 1) || (status >= ret_len))
468 static int wg_send_message (const char* key, const char* value,
469 cdtime_t time, struct wg_callback *cb)
475 message_len = (size_t) ssnprintf (message, sizeof (message),
479 CDTIME_T_TO_DOUBLE(time));
480 if (message_len >= sizeof (message)) {
481 ERROR ("write_graphite plugin: message buffer too small: "
482 "Need %zu bytes.", message_len + 1);
487 pthread_mutex_lock (&cb->send_lock);
491 status = wg_callback_init (cb);
494 ERROR ("write_graphite plugin: wg_callback_init failed.");
495 pthread_mutex_unlock (&cb->send_lock);
500 if (message_len >= cb->send_buf_free)
502 status = wg_flush_nolock (/* timeout = */ 0, cb);
505 pthread_mutex_unlock (&cb->send_lock);
509 assert (message_len < cb->send_buf_free);
511 /* `message_len + 1' because `message_len' does not include the
512 * trailing null byte. Neither does `send_buffer_fill'. */
513 memcpy (cb->send_buf + cb->send_buf_fill,
514 message, message_len + 1);
515 cb->send_buf_fill += message_len;
516 cb->send_buf_free -= message_len;
518 DEBUG ("write_graphite plugin: <%s:%s> buf %zu/%zu (%g%%) \"%s\"",
521 cb->send_buf_fill, sizeof (cb->send_buf),
522 100.0 * ((double) cb->send_buf_fill) / ((double) sizeof (cb->send_buf)),
525 /* Check if we have enough space for this message. */
526 pthread_mutex_unlock (&cb->send_lock);
531 static int wg_write_messages (const data_set_t *ds, const value_list_t *vl,
532 struct wg_callback *cb)
534 char key[10*DATA_MAX_NAME_LEN];
539 if (0 != strcmp (ds->type, vl->type))
541 ERROR ("write_graphite plugin: DS type does not match "
548 for (i = 0; i < ds->ds_num; i++)
550 /* Copy the identifier to `key' and escape it. */
551 status = WG_FORMAT_NAME (key, sizeof (key), vl, cb, ds->ds[i].name);
554 ERROR ("write_graphite plugin: error with format_name");
558 escape_string (key, sizeof (key));
559 /* Convert the values to an ASCII representation and put that
561 status = wg_format_values (values, sizeof (values), i, ds, vl, 0);
564 ERROR ("write_graphite plugin: error with "
569 /* Send the message to graphite */
570 status = wg_send_message (key, values, vl->time, cb);
573 ERROR ("write_graphite plugin: error with "
581 /* Copy the identifier to `key' and escape it. */
582 status = WG_FORMAT_NAME (key, sizeof (key), vl, cb, NULL);
585 ERROR ("write_graphite plugin: error with format_name");
589 escape_string (key, sizeof (key));
590 /* Convert the values to an ASCII representation and put that into
592 status = wg_format_values (values, sizeof (values), 0, ds, vl, 0);
595 ERROR ("write_graphite plugin: error with "
600 /* Send the message to graphite */
601 status = wg_send_message (key, values, vl->time, cb);
604 ERROR ("write_graphite plugin: error with "
613 static int wg_write (const data_set_t *ds, const value_list_t *vl,
614 user_data_t *user_data)
616 struct wg_callback *cb;
619 if (user_data == NULL)
622 cb = user_data->data;
624 status = wg_write_messages (ds, vl, cb);
629 static int config_set_char (char *dest,
632 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
634 WARNING ("write_graphite plugin: The `%s' config option "
635 "needs exactly one string argument.", ci->key);
639 *dest = ci->values[0].value.string[0];
644 static int wg_config_carbon (oconfig_item_t *ci)
646 struct wg_callback *cb;
647 user_data_t user_data;
650 cb = malloc (sizeof (*cb));
653 ERROR ("write_graphite plugin: malloc failed.");
656 memset (cb, 0, sizeof (*cb));
665 pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
667 for (i = 0; i < ci->children_num; i++)
669 oconfig_item_t *child = ci->children + i;
671 if (strcasecmp ("Host", child->key) == 0)
672 cf_util_get_string (child, &cb->node);
673 else if (strcasecmp ("Port", child->key) == 0)
674 cf_util_get_string (child, &cb->service);
675 else if (strcasecmp ("Prefix", child->key) == 0)
676 cf_util_get_string (child, &cb->prefix);
677 else if (strcasecmp ("Postfix", child->key) == 0)
678 cf_util_get_string (child, &cb->postfix);
679 else if (strcasecmp ("DotCharacter", child->key) == 0)
680 config_set_char (&cb->dotchar, child);
683 ERROR ("write_graphite plugin: Invalid configuration "
684 "option: %s.", child->key);
688 DEBUG ("write_graphite: Registering write callback to carbon agent %s:%s",
689 cb->node ? cb->node : WG_DEFAULT_NODE,
690 cb->service ? cb->service : WG_DEFAULT_SERVICE);
692 memset (&user_data, 0, sizeof (user_data));
694 user_data.free_func = NULL;
695 plugin_register_flush ("write_graphite", wg_flush, &user_data);
697 user_data.free_func = wg_callback_free;
698 plugin_register_write ("write_graphite", wg_write, &user_data);
703 static int wg_config (oconfig_item_t *ci)
707 for (i = 0; i < ci->children_num; i++)
709 oconfig_item_t *child = ci->children + i;
711 if (strcasecmp ("Carbon", child->key) == 0)
712 wg_config_carbon (child);
715 ERROR ("write_graphite plugin: Invalid configuration "
716 "option: %s.", child->key);
723 void module_register (void)
725 plugin_register_complex_config ("write_graphite", wg_config);
728 /* vim: set sw=4 ts=4 sts=4 tw=78 et : */