1 /**
2 * collectd - src/write_tsdb.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 * Copyright (C) 2013-2014 Limelight Networks, Inc.
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 * Based on the write_graphite plugin. 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 * write_tsdb Authors:
29 * Brett Hawn <bhawn at llnw.com>
30 * Kevin Bowling <kbowling@llnw.com>
31 **/
33 /* write_tsdb plugin configuation example
34 *
35 * <Plugin write_tsdb>
36 * <Node>
37 * Host "localhost"
38 * Port "4242"
39 * HostTags "status=production deviceclass=www"
40 * </Node>
41 * </Plugin>
42 */
44 #include "collectd.h"
45 #include "common.h"
46 #include "plugin.h"
47 #include "configfile.h"
49 #include "utils_cache.h"
51 #include <pthread.h>
52 #include <netdb.h>
54 #ifndef WT_DEFAULT_NODE
55 # define WT_DEFAULT_NODE "localhost"
56 #endif
58 #ifndef WT_DEFAULT_SERVICE
59 # define WT_DEFAULT_SERVICE "4242"
60 #endif
62 #ifndef WT_DEFAULT_ESCAPE
63 # define WT_DEFAULT_ESCAPE '.'
64 #endif
66 /* Ethernet - (IPv6 + TCP) = 1500 - (40 + 32) = 1428 */
67 #ifndef WT_SEND_BUF_SIZE
68 # define WT_SEND_BUF_SIZE 1428
69 #endif
71 /*
72 * Private variables
73 */
74 struct wt_callback
75 {
76 int sock_fd;
78 char *node;
79 char *service;
80 char *host_tags;
82 _Bool store_rates;
83 _Bool always_append_ds;
85 char send_buf[WT_SEND_BUF_SIZE];
86 size_t send_buf_free;
87 size_t send_buf_fill;
88 cdtime_t send_buf_init_time;
90 pthread_mutex_t send_lock;
91 };
94 /*
95 * Functions
96 */
97 static void wt_reset_buffer(struct wt_callback *cb)
98 {
99 memset(cb->send_buf, 0, sizeof(cb->send_buf));
100 cb->send_buf_free = sizeof(cb->send_buf);
101 cb->send_buf_fill = 0;
102 cb->send_buf_init_time = cdtime();
103 }
105 static int wt_send_buffer(struct wt_callback *cb)
106 {
107 ssize_t status = 0;
109 status = swrite(cb->sock_fd, cb->send_buf, strlen(cb->send_buf));
110 if (status < 0)
111 {
112 char errbuf[1024];
113 ERROR("write_tsdb plugin: send failed with status %zi (%s)",
114 status, sstrerror (errno, errbuf, sizeof (errbuf)));
116 close (cb->sock_fd);
117 cb->sock_fd = -1;
119 return -1;
120 }
122 return 0;
123 }
125 /* NOTE: You must hold cb->send_lock when calling this function! */
126 static int wt_flush_nolock(cdtime_t timeout, struct wt_callback *cb)
127 {
128 int status;
130 DEBUG("write_tsdb plugin: wt_flush_nolock: timeout = %.3f; "
131 "send_buf_fill = %zu;",
132 (double)timeout,
133 cb->send_buf_fill);
135 /* timeout == 0 => flush unconditionally */
136 if (timeout > 0)
137 {
138 cdtime_t now;
140 now = cdtime();
141 if ((cb->send_buf_init_time + timeout) > now)
142 return 0;
143 }
145 if (cb->send_buf_fill == 0)
146 {
147 cb->send_buf_init_time = cdtime();
148 return 0;
149 }
151 status = wt_send_buffer(cb);
152 wt_reset_buffer(cb);
154 return status;
155 }
157 static int wt_callback_init(struct wt_callback *cb)
158 {
159 struct addrinfo ai_hints;
160 struct addrinfo *ai_list;
161 struct addrinfo *ai_ptr;
162 int status;
164 const char *node = cb->node ? cb->node : WT_DEFAULT_NODE;
165 const char *service = cb->service ? cb->service : WT_DEFAULT_SERVICE;
167 if (cb->sock_fd > 0)
168 return 0;
170 memset(&ai_hints, 0, sizeof(ai_hints));
171 #ifdef AI_ADDRCONFIG
172 ai_hints.ai_flags |= AI_ADDRCONFIG;
173 #endif
174 ai_hints.ai_family = AF_UNSPEC;
175 ai_hints.ai_socktype = SOCK_STREAM;
177 ai_list = NULL;
179 status = getaddrinfo(node, service, &ai_hints, &ai_list);
180 if (status != 0)
181 {
182 ERROR("write_tsdb plugin: getaddrinfo (%s, %s) failed: %s",
183 node, service, gai_strerror (status));
184 return -1;
185 }
187 assert (ai_list != NULL);
188 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
189 {
190 cb->sock_fd = socket(ai_ptr->ai_family, ai_ptr->ai_socktype,
191 ai_ptr->ai_protocol);
192 if (cb->sock_fd < 0)
193 continue;
195 status = connect(cb->sock_fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
196 if (status != 0)
197 {
198 close(cb->sock_fd);
199 cb->sock_fd = -1;
200 continue;
201 }
203 break;
204 }
206 freeaddrinfo(ai_list);
208 if (cb->sock_fd < 0)
209 {
210 char errbuf[1024];
211 ERROR("write_tsdb plugin: Connecting to %s:%s failed. "
212 "The last error was: %s", node, service,
213 sstrerror (errno, errbuf, sizeof(errbuf)));
214 return -1;
215 }
217 wt_reset_buffer(cb);
219 return 0;
220 }
222 static void wt_callback_free(void *data)
223 {
224 struct wt_callback *cb;
226 if (data == NULL)
227 return;
229 cb = data;
231 pthread_mutex_lock(&cb->send_lock);
233 wt_flush_nolock(0, cb);
235 close(cb->sock_fd);
236 cb->sock_fd = -1;
238 sfree(cb->node);
239 sfree(cb->service);
240 sfree(cb->host_tags);
242 pthread_mutex_destroy(&cb->send_lock);
244 sfree(cb);
245 }
247 static int wt_flush(cdtime_t timeout,
248 const char *identifier __attribute__((unused)),
249 user_data_t *user_data)
250 {
251 struct wt_callback *cb;
252 int status;
254 if (user_data == NULL)
255 return -EINVAL;
257 cb = user_data->data;
259 pthread_mutex_lock(&cb->send_lock);
261 if (cb->sock_fd < 0)
262 {
263 status = wt_callback_init(cb);
264 if (status != 0)
265 {
266 ERROR("write_tsdb plugin: wt_callback_init failed.");
267 pthread_mutex_unlock(&cb->send_lock);
268 return -1;
269 }
270 }
272 status = wt_flush_nolock(timeout, cb);
273 pthread_mutex_unlock(&cb->send_lock);
275 return status;
276 }
278 static int wt_format_values(char *ret, size_t ret_len,
279 int ds_num, const data_set_t *ds,
280 const value_list_t *vl,
281 _Bool store_rates)
282 {
283 size_t offset = 0;
284 int status;
285 gauge_t *rates = NULL;
287 assert(0 == strcmp (ds->type, vl->type));
289 memset(ret, 0, ret_len);
291 #define BUFFER_ADD(...) do { \
292 status = ssnprintf (ret + offset, ret_len - offset, \
293 __VA_ARGS__); \
294 if (status < 1) \
295 { \
296 sfree(rates); \
297 return -1; \
298 } \
299 else if (((size_t) status) >= (ret_len - offset)) \
300 { \
301 sfree(rates); \
302 return -1; \
303 } \
304 else \
305 offset += ((size_t) status); \
306 } while (0)
308 if (ds->ds[ds_num].type == DS_TYPE_GAUGE)
309 BUFFER_ADD(GAUGE_FORMAT, vl->values[ds_num].gauge);
310 else if (store_rates)
311 {
312 if (rates == NULL)
313 rates = uc_get_rate (ds, vl);
314 if (rates == NULL)
315 {
316 WARNING("format_values: "
317 "uc_get_rate failed.");
318 return -1;
319 }
320 BUFFER_ADD(GAUGE_FORMAT, rates[ds_num]);
321 }
322 else if (ds->ds[ds_num].type == DS_TYPE_COUNTER)
323 BUFFER_ADD("%llu", vl->values[ds_num].counter);
324 else if (ds->ds[ds_num].type == DS_TYPE_DERIVE)
325 BUFFER_ADD("%" PRIi64, vl->values[ds_num].derive);
326 else if (ds->ds[ds_num].type == DS_TYPE_ABSOLUTE)
327 BUFFER_ADD("%" PRIu64, vl->values[ds_num].absolute);
328 else
329 {
330 ERROR("format_values plugin: Unknown data source type: %i",
331 ds->ds[ds_num].type);
332 sfree(rates);
333 return -1;
334 }
336 #undef BUFFER_ADD
338 sfree(rates);
339 return 0;
340 }
342 static int wt_format_name(char *ret, int ret_len,
343 const value_list_t *vl,
344 const struct wt_callback *cb,
345 const char *ds_name)
346 {
347 int status;
348 char *temp = NULL;
349 const char *prefix = "";
350 const char *meta_prefix = "tsdb_prefix";
352 if (vl->meta) {
353 status = meta_data_get_string(vl->meta, meta_prefix, &temp);
354 if (status == -ENOENT) {
355 /* defaults to empty string */
356 } else if (status < 0) {
357 sfree(temp);
358 return status;
359 } else {
360 prefix = temp;
361 }
362 }
364 if (ds_name != NULL) {
365 if (vl->plugin_instance[0] == '\0') {
366 if (vl->type_instance[0] == '\0') {
367 ssnprintf(ret, ret_len, "%s%s.%s.%s", prefix, vl->plugin,
368 vl->type, ds_name);
369 } else {
370 ssnprintf(ret, ret_len, "%s%s.%s.%s.%s", prefix, vl->plugin,
371 vl->type, vl->type_instance, ds_name);
372 }
373 } else { /* vl->plugin_instance != "" */
374 if (vl->type_instance[0] == '\0') {
375 ssnprintf(ret, ret_len, "%s%s.%s.%s.%s", prefix, vl->plugin,
376 vl->plugin_instance, vl->type, ds_name);
377 } else {
378 ssnprintf(ret, ret_len, "%s%s.%s.%s.%s.%s", prefix,
379 vl->plugin, vl->plugin_instance, vl->type,
380 vl->type_instance, ds_name);
381 }
382 }
383 } else { /* ds_name == NULL */
384 if (vl->plugin_instance[0] == '\0') {
385 if (vl->type_instance[0] == '\0') {
386 ssnprintf(ret, ret_len, "%s%s.%s", prefix, vl->plugin,
387 vl->type);
388 } else {
389 ssnprintf(ret, ret_len, "%s%s.%s.%s", prefix, vl->plugin,
390 vl->type_instance, vl->type);
391 }
392 } else { /* vl->plugin_instance != "" */
393 if (vl->type_instance[0] == '\0') {
394 ssnprintf(ret, ret_len, "%s%s.%s.%s", prefix, vl->plugin,
395 vl->plugin_instance, vl->type);
396 } else {
397 ssnprintf(ret, ret_len, "%s%s.%s.%s.%s", prefix, vl->plugin,
398 vl->plugin_instance, vl->type, vl->type_instance);
399 }
400 }
401 }
403 sfree(temp);
404 return 0;
405 }
407 static int wt_send_message (const char* key, const char* value,
408 cdtime_t time, struct wt_callback *cb,
409 const char* host, meta_data_t *md)
410 {
411 int status;
412 size_t message_len;
413 char *temp = NULL;
414 const char *tags = "";
415 char message[1024];
416 const char *host_tags = cb->host_tags ? cb->host_tags : "";
417 const char *meta_tsdb = "tsdb_tags";
419 /* skip if value is NaN */
420 if (value[0] == 'n')
421 return 0;
423 if (md) {
424 status = meta_data_get_string(md, meta_tsdb, &temp);
425 if (status == -ENOENT) {
426 /* defaults to empty string */
427 } else if (status < 0) {
428 ERROR("write_tsdb plugin: tags metadata get failure");
429 sfree(temp);
430 pthread_mutex_unlock(&cb->send_lock);
431 return status;
432 } else {
433 tags = temp;
434 }
435 }
437 status = ssnprintf (message,
438 sizeof(message),
439 "put %s %.0f %s fqdn=%s %s %s\r\n",
440 key,
441 CDTIME_T_TO_DOUBLE(time),
442 value,
443 host,
444 tags,
445 host_tags);
446 sfree(temp);
447 if (status < 0)
448 return -1;
449 message_len = (size_t) status;
451 if (message_len >= sizeof(message)) {
452 ERROR("write_tsdb plugin: message buffer too small: "
453 "Need %zu bytes.", message_len + 1);
454 return -1;
455 }
457 pthread_mutex_lock(&cb->send_lock);
459 if (cb->sock_fd < 0)
460 {
461 status = wt_callback_init(cb);
462 if (status != 0)
463 {
464 ERROR("write_tsdb plugin: wt_callback_init failed.");
465 pthread_mutex_unlock(&cb->send_lock);
466 return -1;
467 }
468 }
470 if (message_len >= cb->send_buf_free)
471 {
472 status = wt_flush_nolock(0, cb);
473 if (status != 0)
474 {
475 pthread_mutex_unlock(&cb->send_lock);
476 return status;
477 }
478 }
480 /* Assert that we have enough space for this message. */
481 assert(message_len < cb->send_buf_free);
483 /* `message_len + 1' because `message_len' does not include the
484 * trailing null byte. Neither does `send_buffer_fill'. */
485 memcpy(cb->send_buf + cb->send_buf_fill,
486 message, message_len + 1);
487 cb->send_buf_fill += message_len;
488 cb->send_buf_free -= message_len;
490 DEBUG("write_tsdb plugin: [%s]:%s buf %zu/%zu (%.1f %%) \"%s\"",
491 cb->node,
492 cb->service,
493 cb->send_buf_fill, sizeof(cb->send_buf),
494 100.0 * ((double) cb->send_buf_fill) /
495 ((double) sizeof(cb->send_buf)),
496 message);
498 pthread_mutex_unlock(&cb->send_lock);
500 return 0;
501 }
503 static int wt_write_messages(const data_set_t *ds, const value_list_t *vl,
504 struct wt_callback *cb)
505 {
506 char key[10*DATA_MAX_NAME_LEN];
507 char values[512];
509 int status;
510 size_t i;
512 if (0 != strcmp(ds->type, vl->type))
513 {
514 ERROR("write_tsdb plugin: DS type does not match "
515 "value list type");
516 return -1;
517 }
519 for (i = 0; i < ds->ds_num; i++)
520 {
521 const char *ds_name = NULL;
523 if (cb->always_append_ds || (ds->ds_num > 1))
524 ds_name = ds->ds[i].name;
526 /* Copy the identifier to 'key' and escape it. */
527 status = wt_format_name(key, sizeof(key), vl, cb, ds_name);
528 if (status != 0)
529 {
530 ERROR("write_tsdb plugin: error with format_name");
531 return status;
532 }
534 escape_string(key, sizeof(key));
535 /* Convert the values to an ASCII representation and put that into
536 * 'values'. */
537 status = wt_format_values(values, sizeof(values), i, ds, vl,
538 cb->store_rates);
539 if (status != 0)
540 {
541 ERROR("write_tsdb plugin: error with "
542 "wt_format_values");
543 return status;
544 }
546 /* Send the message to tsdb */
547 status = wt_send_message(key, values, vl->time, cb, vl->host, vl->meta);
548 if (status != 0)
549 {
550 ERROR("write_tsdb plugin: error with "
551 "wt_send_message");
552 return status;
553 }
554 }
556 return 0;
557 }
559 static int wt_write(const data_set_t *ds, const value_list_t *vl,
560 user_data_t *user_data)
561 {
562 struct wt_callback *cb;
563 int status;
565 if (user_data == NULL)
566 return EINVAL;
568 cb = user_data->data;
570 status = wt_write_messages(ds, vl, cb);
572 return status;
573 }
575 static int wt_config_tsd(oconfig_item_t *ci)
576 {
577 struct wt_callback *cb;
578 user_data_t user_data;
579 char callback_name[DATA_MAX_NAME_LEN];
580 int i;
582 cb = calloc(1, sizeof(*cb));
583 if (cb == NULL)
584 {
585 ERROR("write_tsdb plugin: calloc failed.");
586 return -1;
587 }
588 cb->sock_fd = -1;
589 cb->node = NULL;
590 cb->service = NULL;
591 cb->host_tags = NULL;
592 cb->store_rates = 0;
594 pthread_mutex_init (&cb->send_lock, NULL);
596 for (i = 0; i < ci->children_num; i++)
597 {
598 oconfig_item_t *child = ci->children + i;
600 if (strcasecmp("Host", child->key) == 0)
601 cf_util_get_string(child, &cb->node);
602 else if (strcasecmp("Port", child->key) == 0)
603 cf_util_get_service(child, &cb->service);
604 else if (strcasecmp("HostTags", child->key) == 0)
605 cf_util_get_string(child, &cb->host_tags);
606 else if (strcasecmp("StoreRates", child->key) == 0)
607 cf_util_get_boolean(child, &cb->store_rates);
608 else if (strcasecmp("AlwaysAppendDS", child->key) == 0)
609 cf_util_get_boolean(child, &cb->always_append_ds);
610 else
611 {
612 ERROR("write_tsdb plugin: Invalid configuration "
613 "option: %s.", child->key);
614 }
615 }
617 ssnprintf(callback_name, sizeof(callback_name), "write_tsdb/%s/%s",
618 cb->node != NULL ? cb->node : WT_DEFAULT_NODE,
619 cb->service != NULL ? cb->service : WT_DEFAULT_SERVICE);
621 memset(&user_data, 0, sizeof(user_data));
622 user_data.data = cb;
623 user_data.free_func = wt_callback_free;
624 plugin_register_write(callback_name, wt_write, &user_data);
626 user_data.free_func = NULL;
627 plugin_register_flush(callback_name, wt_flush, &user_data);
629 return 0;
630 }
632 static int wt_config(oconfig_item_t *ci)
633 {
634 int i;
636 for (i = 0; i < ci->children_num; i++)
637 {
638 oconfig_item_t *child = ci->children + i;
640 if (strcasecmp("Node", child->key) == 0)
641 wt_config_tsd(child);
642 else
643 {
644 ERROR("write_tsdb plugin: Invalid configuration "
645 "option: %s.", child->key);
646 }
647 }
649 return 0;
650 }
652 void module_register(void)
653 {
654 plugin_register_complex_config("write_tsdb", wt_config);
655 }
657 /* vim: set sw=4 ts=4 sts=4 tw=78 et : */