1 /**
2 * collectd - src/amqp.c
3 * Copyright (C) 2009 Sebastien Pahl
4 * Copyright (C) 2010-2012 Florian Forster
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 *
24 * Authors:
25 * Sebastien Pahl <sebastien.pahl at dotcloud.com>
26 * Florian Forster <octo at collectd.org>
27 **/
28
29 #include "collectd.h"
30
31 #include "plugin.h"
32 #include "utils/cmds/putval.h"
33 #include "utils/common/common.h"
34 #include "utils/format_graphite/format_graphite.h"
35 #include "utils/format_json/format_json.h"
36 #include "utils_random.h"
37
38 #include <amqp.h>
39 #include <amqp_framing.h>
40
41 #ifdef HAVE_AMQP_TCP_SOCKET_H
42 #include <amqp_ssl_socket.h>
43 #include <amqp_tcp_socket.h>
44 #endif
45 #ifdef HAVE_AMQP_SOCKET_H
46 #include <amqp_socket.h>
47 #endif
48 #ifdef HAVE_AMQP_TCP_SOCKET
49 #if defined HAVE_DECL_AMQP_SOCKET_CLOSE && !HAVE_DECL_AMQP_SOCKET_CLOSE
50 /* rabbitmq-c does not currently ship amqp_socket.h
51 * and, thus, does not define this function. */
52 int amqp_socket_close(amqp_socket_t *);
53 #endif
54 #endif
55
56 /* Defines for the delivery mode. I have no idea why they're not defined by the
57 * library.. */
58 #define CAMQP_DM_VOLATILE 1
59 #define CAMQP_DM_PERSISTENT 2
60
61 #define CAMQP_FORMAT_COMMAND 1
62 #define CAMQP_FORMAT_JSON 2
63 #define CAMQP_FORMAT_GRAPHITE 3
64
65 #define CAMQP_CHANNEL 1
66
67 /*
68 * Data types
69 */
70 struct camqp_config_s {
71 bool publish;
72 char *name;
73
74 char **hosts;
75 size_t hosts_count;
76 int port;
77 char *vhost;
78 char *user;
79 char *password;
80
81 bool tls_enabled;
82 bool tls_verify_peer;
83 bool tls_verify_hostname;
84 char *tls_cacert;
85 char *tls_client_cert;
86 char *tls_client_key;
87
88 char *exchange;
89 char *routing_key;
90
91 /* Number of seconds to wait before connection is retried */
92 int connection_retry_delay;
93
94 /* publish only */
95 uint8_t delivery_mode;
96 bool store_rates;
97 int format;
98 /* publish & graphite format only */
99 char *prefix;
100 char *postfix;
101 char escape_char;
102 unsigned int graphite_flags;
103
104 /* subscribe only */
105 char *exchange_type;
106 char *queue;
107 bool queue_durable;
108 bool queue_auto_delete;
109
110 amqp_connection_state_t connection;
111 pthread_mutex_t lock;
112 };
113 typedef struct camqp_config_s camqp_config_t;
114
115 /*
116 * Global variables
117 */
118 static const char *def_vhost = "/";
119 static const char *def_user = "guest";
120 static const char *def_password = "guest";
121 static const char *def_exchange = "amq.fanout";
122
123 static pthread_t *subscriber_threads;
124 static size_t subscriber_threads_num;
125 static bool subscriber_threads_running = true;
126
127 #define CONF(c, f) (((c)->f != NULL) ? (c)->f : def_##f)
128
129 /*
130 * Functions
131 */
camqp_close_connection(camqp_config_t * conf)132 static void camqp_close_connection(camqp_config_t *conf) /* {{{ */
133 {
134 int sockfd;
135
136 if ((conf == NULL) || (conf->connection == NULL))
137 return;
138
139 sockfd = amqp_get_sockfd(conf->connection);
140 amqp_channel_close(conf->connection, CAMQP_CHANNEL, AMQP_REPLY_SUCCESS);
141 amqp_connection_close(conf->connection, AMQP_REPLY_SUCCESS);
142 amqp_destroy_connection(conf->connection);
143 close(sockfd);
144 conf->connection = NULL;
145 } /* }}} void camqp_close_connection */
146
camqp_config_free(void * ptr)147 static void camqp_config_free(void *ptr) /* {{{ */
148 {
149 camqp_config_t *conf = ptr;
150
151 if (conf == NULL)
152 return;
153
154 camqp_close_connection(conf);
155
156 sfree(conf->name);
157 strarray_free(conf->hosts, conf->hosts_count);
158 sfree(conf->vhost);
159 sfree(conf->user);
160 sfree(conf->password);
161 sfree(conf->tls_cacert);
162 sfree(conf->tls_client_cert);
163 sfree(conf->tls_client_key);
164 sfree(conf->exchange);
165 sfree(conf->exchange_type);
166 sfree(conf->queue);
167 sfree(conf->routing_key);
168 sfree(conf->prefix);
169 sfree(conf->postfix);
170
171 sfree(conf);
172 } /* }}} void camqp_config_free */
173
camqp_bytes_cstring(amqp_bytes_t * in)174 static char *camqp_bytes_cstring(amqp_bytes_t *in) /* {{{ */
175 {
176 char *ret;
177
178 if ((in == NULL) || (in->bytes == NULL))
179 return NULL;
180
181 ret = malloc(in->len + 1);
182 if (ret == NULL)
183 return NULL;
184
185 memcpy(ret, in->bytes, in->len);
186 ret[in->len] = 0;
187
188 return ret;
189 } /* }}} char *camqp_bytes_cstring */
190
camqp_is_error(camqp_config_t * conf)191 static bool camqp_is_error(camqp_config_t *conf) /* {{{ */
192 {
193 amqp_rpc_reply_t r;
194
195 r = amqp_get_rpc_reply(conf->connection);
196 if (r.reply_type == AMQP_RESPONSE_NORMAL)
197 return false;
198
199 return true;
200 } /* }}} bool camqp_is_error */
201
camqp_strerror(camqp_config_t * conf,char * buffer,size_t buffer_size)202 static char *camqp_strerror(camqp_config_t *conf, /* {{{ */
203 char *buffer, size_t buffer_size) {
204 amqp_rpc_reply_t r;
205
206 r = amqp_get_rpc_reply(conf->connection);
207 switch (r.reply_type) {
208 case AMQP_RESPONSE_NORMAL:
209 sstrncpy(buffer, "Success", buffer_size);
210 break;
211
212 case AMQP_RESPONSE_NONE:
213 sstrncpy(buffer, "Missing RPC reply type", buffer_size);
214 break;
215
216 case AMQP_RESPONSE_LIBRARY_EXCEPTION:
217 #if HAVE_AMQP_RPC_REPLY_T_LIBRARY_ERRNO
218 if (r.library_errno)
219 return sstrerror(r.library_errno, buffer, buffer_size);
220 #else
221 if (r.library_error)
222 return sstrerror(r.library_error, buffer, buffer_size);
223 #endif
224 else
225 sstrncpy(buffer, "End of stream", buffer_size);
226 break;
227
228 case AMQP_RESPONSE_SERVER_EXCEPTION:
229 if (r.reply.id == AMQP_CONNECTION_CLOSE_METHOD) {
230 amqp_connection_close_t *m = r.reply.decoded;
231 char *tmp = camqp_bytes_cstring(&m->reply_text);
232 ssnprintf(buffer, buffer_size, "Server connection error %d: %s",
233 m->reply_code, tmp);
234 sfree(tmp);
235 } else if (r.reply.id == AMQP_CHANNEL_CLOSE_METHOD) {
236 amqp_channel_close_t *m = r.reply.decoded;
237 char *tmp = camqp_bytes_cstring(&m->reply_text);
238 ssnprintf(buffer, buffer_size, "Server channel error %d: %s",
239 m->reply_code, tmp);
240 sfree(tmp);
241 } else {
242 ssnprintf(buffer, buffer_size, "Server error method %#" PRIx32,
243 r.reply.id);
244 }
245 break;
246
247 default:
248 ssnprintf(buffer, buffer_size, "Unknown reply type %i", (int)r.reply_type);
249 }
250
251 return buffer;
252 } /* }}} char *camqp_strerror */
253
254 #if HAVE_AMQP_RPC_REPLY_T_LIBRARY_ERRNO
camqp_create_exchange(camqp_config_t * conf)255 static int camqp_create_exchange(camqp_config_t *conf) /* {{{ */
256 {
257 amqp_exchange_declare_ok_t *ed_ret;
258
259 if (conf->exchange_type == NULL)
260 return 0;
261
262 ed_ret = amqp_exchange_declare(
263 conf->connection,
264 /* channel = */ CAMQP_CHANNEL,
265 /* exchange = */ amqp_cstring_bytes(conf->exchange),
266 /* type = */ amqp_cstring_bytes(conf->exchange_type),
267 /* passive = */ 0,
268 /* durable = */ 0,
269 /* auto_delete = */ 1,
270 /* arguments = */ AMQP_EMPTY_TABLE);
271 if ((ed_ret == NULL) && camqp_is_error(conf)) {
272 char errbuf[1024];
273 ERROR("amqp plugin: amqp_exchange_declare failed: %s",
274 camqp_strerror(conf, errbuf, sizeof(errbuf)));
275 camqp_close_connection(conf);
276 return -1;
277 }
278
279 INFO("amqp plugin: Successfully created exchange \"%s\" "
280 "with type \"%s\".",
281 conf->exchange, conf->exchange_type);
282
283 return 0;
284 } /* }}} int camqp_create_exchange */
285 #else
camqp_create_exchange(camqp_config_t * conf)286 static int camqp_create_exchange(camqp_config_t *conf) /* {{{ */
287 {
288 amqp_exchange_declare_ok_t *ed_ret;
289 amqp_table_t argument_table;
290 struct amqp_table_entry_t_ argument_table_entries[1];
291
292 if (conf->exchange_type == NULL)
293 return 0;
294
295 /* Valid arguments: "auto_delete", "internal" */
296 argument_table.num_entries = STATIC_ARRAY_SIZE(argument_table_entries);
297 argument_table.entries = argument_table_entries;
298 argument_table_entries[0].key = amqp_cstring_bytes("auto_delete");
299 argument_table_entries[0].value.kind = AMQP_FIELD_KIND_BOOLEAN;
300 argument_table_entries[0].value.value.boolean = 1;
301
302 ed_ret = amqp_exchange_declare(
303 conf->connection,
304 /* channel = */ CAMQP_CHANNEL,
305 /* exchange = */ amqp_cstring_bytes(conf->exchange),
306 /* type = */ amqp_cstring_bytes(conf->exchange_type),
307 /* passive = */ 0,
308 /* durable = */ 0,
309 #if defined(AMQP_VERSION) && AMQP_VERSION >= 0x00060000
310 /* auto delete = */ 0,
311 /* internal = */ 0,
312 #endif
313 /* arguments = */ argument_table);
314 if ((ed_ret == NULL) && camqp_is_error(conf)) {
315 char errbuf[1024];
316 ERROR("amqp plugin: amqp_exchange_declare failed: %s",
317 camqp_strerror(conf, errbuf, sizeof(errbuf)));
318 camqp_close_connection(conf);
319 return -1;
320 }
321
322 INFO("amqp plugin: Successfully created exchange \"%s\" "
323 "with type \"%s\".",
324 conf->exchange, conf->exchange_type);
325
326 return 0;
327 } /* }}} int camqp_create_exchange */
328 #endif
329
camqp_setup_queue(camqp_config_t * conf)330 static int camqp_setup_queue(camqp_config_t *conf) /* {{{ */
331 {
332 amqp_queue_declare_ok_t *qd_ret;
333 amqp_basic_consume_ok_t *cm_ret;
334
335 qd_ret =
336 amqp_queue_declare(conf->connection,
337 /* channel = */ CAMQP_CHANNEL,
338 /* queue = */
339 (conf->queue != NULL) ? amqp_cstring_bytes(conf->queue)
340 : AMQP_EMPTY_BYTES,
341 /* passive = */ 0,
342 /* durable = */ conf->queue_durable,
343 /* exclusive = */ 0,
344 /* auto_delete = */ conf->queue_auto_delete,
345 /* arguments = */ AMQP_EMPTY_TABLE);
346 if (qd_ret == NULL) {
347 ERROR("amqp plugin: amqp_queue_declare failed.");
348 camqp_close_connection(conf);
349 return -1;
350 }
351
352 if (conf->queue == NULL) {
353 conf->queue = camqp_bytes_cstring(&qd_ret->queue);
354 if (conf->queue == NULL) {
355 ERROR("amqp plugin: camqp_bytes_cstring failed.");
356 camqp_close_connection(conf);
357 return -1;
358 }
359
360 INFO("amqp plugin: Created queue \"%s\".", conf->queue);
361 }
362 DEBUG("amqp plugin: Successfully created queue \"%s\".", conf->queue);
363
364 /* bind to an exchange */
365 if (conf->exchange != NULL) {
366 amqp_queue_bind_ok_t *qb_ret;
367
368 assert(conf->queue != NULL);
369 qb_ret = amqp_queue_bind(
370 conf->connection,
371 /* channel = */ CAMQP_CHANNEL,
372 /* queue = */ amqp_cstring_bytes(conf->queue),
373 /* exchange = */ amqp_cstring_bytes(conf->exchange),
374 /* routing_key = */
375 (conf->routing_key != NULL) ? amqp_cstring_bytes(conf->routing_key)
376 : AMQP_EMPTY_BYTES,
377 /* arguments = */ AMQP_EMPTY_TABLE);
378 if ((qb_ret == NULL) && camqp_is_error(conf)) {
379 char errbuf[1024];
380 ERROR("amqp plugin: amqp_queue_bind failed: %s",
381 camqp_strerror(conf, errbuf, sizeof(errbuf)));
382 camqp_close_connection(conf);
383 return -1;
384 }
385
386 DEBUG("amqp plugin: Successfully bound queue \"%s\" to exchange \"%s\".",
387 conf->queue, conf->exchange);
388 } /* if (conf->exchange != NULL) */
389
390 cm_ret =
391 amqp_basic_consume(conf->connection,
392 /* channel = */ CAMQP_CHANNEL,
393 /* queue = */ amqp_cstring_bytes(conf->queue),
394 /* consumer_tag = */ AMQP_EMPTY_BYTES,
395 /* no_local = */ 0,
396 /* no_ack = */ 1,
397 /* exclusive = */ 0,
398 /* arguments = */ AMQP_EMPTY_TABLE);
399 if ((cm_ret == NULL) && camqp_is_error(conf)) {
400 char errbuf[1024];
401 ERROR("amqp plugin: amqp_basic_consume failed: %s",
402 camqp_strerror(conf, errbuf, sizeof(errbuf)));
403 camqp_close_connection(conf);
404 return -1;
405 }
406
407 return 0;
408 } /* }}} int camqp_setup_queue */
409
camqp_connect(camqp_config_t * conf)410 static int camqp_connect(camqp_config_t *conf) /* {{{ */
411 {
412 static time_t last_connect_time;
413
414 amqp_rpc_reply_t reply;
415 int status;
416 #ifdef HAVE_AMQP_TCP_SOCKET
417 amqp_socket_t *socket;
418 #else
419 int sockfd;
420 #endif
421
422 if (conf->connection != NULL)
423 return 0;
424
425 time_t now = time(NULL);
426 if (now < (last_connect_time + conf->connection_retry_delay)) {
427 DEBUG("amqp plugin: skipping connection retry, "
428 "ConnectionRetryDelay: %d",
429 conf->connection_retry_delay);
430 return 1;
431 } else {
432 DEBUG("amqp plugin: retrying connection");
433 last_connect_time = now;
434 }
435
436 conf->connection = amqp_new_connection();
437 if (conf->connection == NULL) {
438 ERROR("amqp plugin: amqp_new_connection failed.");
439 return ENOMEM;
440 }
441
442 char *host = conf->hosts[cdrand_u() % conf->hosts_count];
443 INFO("amqp plugin: Connecting to %s", host);
444
445 #ifdef HAVE_AMQP_TCP_SOCKET
446 #define CLOSE_SOCKET() /* amqp_destroy_connection() closes the socket for us \
447 */
448
449 if (conf->tls_enabled) {
450 socket = amqp_ssl_socket_new(conf->connection);
451 if (!socket) {
452 ERROR("amqp plugin: amqp_ssl_socket_new failed.");
453 amqp_destroy_connection(conf->connection);
454 conf->connection = NULL;
455 return ENOMEM;
456 }
457
458 #if AMQP_VERSION >= 0x00080000
459 amqp_ssl_socket_set_verify_peer(socket, conf->tls_verify_peer);
460 amqp_ssl_socket_set_verify_hostname(socket, conf->tls_verify_hostname);
461 #endif
462
463 if (conf->tls_cacert) {
464 status = amqp_ssl_socket_set_cacert(socket, conf->tls_cacert);
465 if (status < 0) {
466 ERROR("amqp plugin: amqp_ssl_socket_set_cacert failed: %s",
467 amqp_error_string2(status));
468 amqp_destroy_connection(conf->connection);
469 conf->connection = NULL;
470 return status;
471 }
472 }
473 if (conf->tls_client_cert && conf->tls_client_key) {
474 status = amqp_ssl_socket_set_key(socket, conf->tls_client_cert,
475 conf->tls_client_key);
476 if (status < 0) {
477 ERROR("amqp plugin: amqp_ssl_socket_set_key failed: %s",
478 amqp_error_string2(status));
479 amqp_destroy_connection(conf->connection);
480 conf->connection = NULL;
481 return status;
482 }
483 }
484 } else {
485 socket = amqp_tcp_socket_new(conf->connection);
486 if (!socket) {
487 ERROR("amqp plugin: amqp_tcp_socket_new failed.");
488 amqp_destroy_connection(conf->connection);
489 conf->connection = NULL;
490 return ENOMEM;
491 }
492 }
493
494 status = amqp_socket_open(socket, host, conf->port);
495 if (status < 0) {
496 ERROR("amqp plugin: amqp_socket_open failed: %s",
497 amqp_error_string2(status));
498 amqp_destroy_connection(conf->connection);
499 conf->connection = NULL;
500 return status;
501 }
502 #else /* HAVE_AMQP_TCP_SOCKET */
503 #define CLOSE_SOCKET() close(sockfd)
504 /* this interface is deprecated as of rabbitmq-c 0.4 */
505 sockfd = amqp_open_socket(host, conf->port);
506 if (sockfd < 0) {
507 status = (-1) * sockfd;
508 ERROR("amqp plugin: amqp_open_socket failed: %s", STRERROR(status));
509 amqp_destroy_connection(conf->connection);
510 conf->connection = NULL;
511 return status;
512 }
513 amqp_set_sockfd(conf->connection, sockfd);
514 #endif
515
516 reply = amqp_login(conf->connection, CONF(conf, vhost),
517 /* channel max = */ 0,
518 /* frame max = */ 131072,
519 /* heartbeat = */ 0,
520 /* authentication = */ AMQP_SASL_METHOD_PLAIN,
521 CONF(conf, user), CONF(conf, password));
522 if (reply.reply_type != AMQP_RESPONSE_NORMAL) {
523 ERROR("amqp plugin: amqp_login (vhost = %s, user = %s) failed.",
524 CONF(conf, vhost), CONF(conf, user));
525 amqp_destroy_connection(conf->connection);
526 CLOSE_SOCKET();
527 conf->connection = NULL;
528 return 1;
529 }
530
531 amqp_channel_open(conf->connection, /* channel = */ 1);
532 /* FIXME: Is checking "reply.reply_type" really correct here? How does
533 * it get set? --octo */
534 if (reply.reply_type != AMQP_RESPONSE_NORMAL) {
535 ERROR("amqp plugin: amqp_channel_open failed.");
536 amqp_connection_close(conf->connection, AMQP_REPLY_SUCCESS);
537 amqp_destroy_connection(conf->connection);
538 CLOSE_SOCKET();
539 conf->connection = NULL;
540 return 1;
541 }
542
543 INFO("amqp plugin: Successfully opened connection to vhost \"%s\" "
544 "on %s:%i.",
545 CONF(conf, vhost), host, conf->port);
546
547 status = camqp_create_exchange(conf);
548 if (status != 0)
549 return status;
550
551 if (!conf->publish)
552 return camqp_setup_queue(conf);
553 return 0;
554 } /* }}} int camqp_connect */
555
camqp_shutdown(void)556 static int camqp_shutdown(void) /* {{{ */
557 {
558 DEBUG("amqp plugin: Shutting down %" PRIsz " subscriber threads.",
559 subscriber_threads_num);
560
561 subscriber_threads_running = 0;
562 for (size_t i = 0; i < subscriber_threads_num; i++) {
563 /* FIXME: Sending a signal is not very elegant here. Maybe find out how
564 * to use a timeout in the thread and check for the variable in regular
565 * intervals. */
566 pthread_kill(subscriber_threads[i], SIGTERM);
567 pthread_join(subscriber_threads[i], /* retval = */ NULL);
568 }
569
570 subscriber_threads_num = 0;
571 sfree(subscriber_threads);
572
573 DEBUG("amqp plugin: All subscriber threads exited.");
574
575 return 0;
576 } /* }}} int camqp_shutdown */
577
578 /*
579 * Subscribing code
580 */
camqp_read_body(camqp_config_t * conf,size_t body_size,const char * content_type)581 static int camqp_read_body(camqp_config_t *conf, /* {{{ */
582 size_t body_size, const char *content_type) {
583 char body[body_size + 1];
584 char *body_ptr;
585 size_t received;
586 amqp_frame_t frame;
587 int status;
588
589 memset(body, 0, sizeof(body));
590 body_ptr = &body[0];
591 received = 0;
592
593 while (received < body_size) {
594 status = amqp_simple_wait_frame(conf->connection, &frame);
595 if (status < 0) {
596 status = (-1) * status;
597 ERROR("amqp plugin: amqp_simple_wait_frame failed: %s", STRERROR(status));
598 camqp_close_connection(conf);
599 return status;
600 }
601
602 if (frame.frame_type != AMQP_FRAME_BODY) {
603 NOTICE("amqp plugin: Unexpected frame type: %#" PRIx8, frame.frame_type);
604 return -1;
605 }
606
607 if ((body_size - received) < frame.payload.body_fragment.len) {
608 WARNING("amqp plugin: Body is larger than indicated by header.");
609 return -1;
610 }
611
612 memcpy(body_ptr, frame.payload.body_fragment.bytes,
613 frame.payload.body_fragment.len);
614 body_ptr += frame.payload.body_fragment.len;
615 received += frame.payload.body_fragment.len;
616 } /* while (received < body_size) */
617
618 if (strcasecmp("text/collectd", content_type) == 0) {
619 status = cmd_handle_putval(stderr, body);
620 if (status != 0)
621 ERROR("amqp plugin: cmd_handle_putval failed with status %i.", status);
622 return status;
623 } else if (strcasecmp("application/json", content_type) == 0) {
624 ERROR("amqp plugin: camqp_read_body: Parsing JSON data has not "
625 "been implemented yet. FIXME!");
626 return 0;
627 } else {
628 ERROR("amqp plugin: camqp_read_body: Unknown content type \"%s\".",
629 content_type);
630 return EINVAL;
631 }
632
633 /* not reached */
634 return 0;
635 } /* }}} int camqp_read_body */
636
camqp_read_header(camqp_config_t * conf)637 static int camqp_read_header(camqp_config_t *conf) /* {{{ */
638 {
639 int status;
640 amqp_frame_t frame;
641 amqp_basic_properties_t *properties;
642 char *content_type;
643
644 status = amqp_simple_wait_frame(conf->connection, &frame);
645 if (status < 0) {
646 status = (-1) * status;
647 ERROR("amqp plugin: amqp_simple_wait_frame failed: %s", STRERROR(status));
648 camqp_close_connection(conf);
649 return status;
650 }
651
652 if (frame.frame_type != AMQP_FRAME_HEADER) {
653 NOTICE("amqp plugin: Unexpected frame type: %#" PRIx8, frame.frame_type);
654 return -1;
655 }
656
657 properties = frame.payload.properties.decoded;
658 content_type = camqp_bytes_cstring(&properties->content_type);
659 if (content_type == NULL) {
660 ERROR("amqp plugin: Unable to determine content type.");
661 return -1;
662 }
663
664 status = camqp_read_body(conf, (size_t)frame.payload.properties.body_size,
665 content_type);
666
667 sfree(content_type);
668 return status;
669 } /* }}} int camqp_read_header */
670
camqp_subscribe_thread(void * user_data)671 static void *camqp_subscribe_thread(void *user_data) /* {{{ */
672 {
673 camqp_config_t *conf = user_data;
674 int status;
675
676 cdtime_t interval = plugin_get_interval();
677
678 while (subscriber_threads_running) {
679 amqp_frame_t frame;
680
681 status = camqp_connect(conf);
682 if (status != 0) {
683 ERROR("amqp plugin: camqp_connect failed. "
684 "Will sleep for %.3f seconds.",
685 CDTIME_T_TO_DOUBLE(interval));
686 nanosleep(&CDTIME_T_TO_TIMESPEC(interval), /* remaining = */ NULL);
687 continue;
688 }
689
690 status = amqp_simple_wait_frame(conf->connection, &frame);
691 if (status < 0) {
692 ERROR("amqp plugin: amqp_simple_wait_frame failed. "
693 "Will sleep for %.3f seconds.",
694 CDTIME_T_TO_DOUBLE(interval));
695 camqp_close_connection(conf);
696 nanosleep(&CDTIME_T_TO_TIMESPEC(interval), /* remaining = */ NULL);
697 continue;
698 }
699
700 if (frame.frame_type != AMQP_FRAME_METHOD) {
701 DEBUG("amqp plugin: Unexpected frame type: %#" PRIx8, frame.frame_type);
702 continue;
703 }
704
705 if (frame.payload.method.id != AMQP_BASIC_DELIVER_METHOD) {
706 DEBUG("amqp plugin: Unexpected method id: %#" PRIx32,
707 frame.payload.method.id);
708 continue;
709 }
710
711 camqp_read_header(conf);
712
713 amqp_maybe_release_buffers(conf->connection);
714 } /* while (subscriber_threads_running) */
715
716 camqp_config_free(conf);
717 pthread_exit(NULL);
718 return NULL;
719 } /* }}} void *camqp_subscribe_thread */
720
camqp_subscribe_init(camqp_config_t * conf)721 static int camqp_subscribe_init(camqp_config_t *conf) /* {{{ */
722 {
723 int status;
724 pthread_t *tmp;
725
726 tmp = realloc(subscriber_threads,
727 sizeof(*subscriber_threads) * (subscriber_threads_num + 1));
728 if (tmp == NULL) {
729 ERROR("amqp plugin: realloc failed.");
730 sfree(subscriber_threads);
731 return ENOMEM;
732 }
733 subscriber_threads = tmp;
734 tmp = subscriber_threads + subscriber_threads_num;
735 memset(tmp, 0, sizeof(*tmp));
736
737 status =
738 plugin_thread_create(tmp, camqp_subscribe_thread, conf, "amqp subscribe");
739 if (status != 0) {
740 ERROR("amqp plugin: pthread_create failed: %s", STRERROR(status));
741 return status;
742 }
743
744 subscriber_threads_num++;
745
746 return 0;
747 } /* }}} int camqp_subscribe_init */
748
749 /*
750 * Publishing code
751 */
752 /* XXX: You must hold "conf->lock" when calling this function! */
camqp_write_locked(camqp_config_t * conf,const char * buffer,const char * routing_key)753 static int camqp_write_locked(camqp_config_t *conf, /* {{{ */
754 const char *buffer, const char *routing_key) {
755 int status;
756
757 status = camqp_connect(conf);
758 if (status != 0)
759 return status;
760
761 amqp_basic_properties_t props = {._flags = AMQP_BASIC_CONTENT_TYPE_FLAG |
762 AMQP_BASIC_DELIVERY_MODE_FLAG |
763 AMQP_BASIC_APP_ID_FLAG,
764 .delivery_mode = conf->delivery_mode,
765 .app_id = amqp_cstring_bytes("collectd")};
766
767 if (conf->format == CAMQP_FORMAT_COMMAND)
768 props.content_type = amqp_cstring_bytes("text/collectd");
769 else if (conf->format == CAMQP_FORMAT_JSON)
770 props.content_type = amqp_cstring_bytes("application/json");
771 else if (conf->format == CAMQP_FORMAT_GRAPHITE)
772 props.content_type = amqp_cstring_bytes("text/graphite");
773 else
774 assert(23 == 42);
775
776 status = amqp_basic_publish(
777 conf->connection,
778 /* channel = */ 1, amqp_cstring_bytes(CONF(conf, exchange)),
779 amqp_cstring_bytes(routing_key),
780 /* mandatory = */ 0,
781 /* immediate = */ 0, &props, amqp_cstring_bytes(buffer));
782 if (status != 0) {
783 ERROR("amqp plugin: amqp_basic_publish failed with status %i.", status);
784 camqp_close_connection(conf);
785 }
786
787 return status;
788 } /* }}} int camqp_write_locked */
789
camqp_write(const data_set_t * ds,const value_list_t * vl,user_data_t * user_data)790 static int camqp_write(const data_set_t *ds, const value_list_t *vl, /* {{{ */
791 user_data_t *user_data) {
792 camqp_config_t *conf = user_data->data;
793 char routing_key[6 * DATA_MAX_NAME_LEN];
794 char buffer[8192];
795 int status;
796
797 if ((ds == NULL) || (vl == NULL) || (conf == NULL))
798 return EINVAL;
799
800 if (conf->routing_key != NULL) {
801 sstrncpy(routing_key, conf->routing_key, sizeof(routing_key));
802 } else {
803 ssnprintf(routing_key, sizeof(routing_key), "collectd/%s/%s/%s/%s/%s",
804 vl->host, vl->plugin, vl->plugin_instance, vl->type,
805 vl->type_instance);
806
807 /* Switch slashes (the only character forbidden by collectd) and dots
808 * (the separation character used by AMQP). */
809 for (size_t i = 0; routing_key[i] != 0; i++) {
810 if (routing_key[i] == '.')
811 routing_key[i] = '/';
812 else if (routing_key[i] == '/')
813 routing_key[i] = '.';
814 }
815 }
816
817 if (conf->format == CAMQP_FORMAT_COMMAND) {
818 status = cmd_create_putval(buffer, sizeof(buffer), ds, vl);
819 if (status != 0) {
820 ERROR("amqp plugin: cmd_create_putval failed with status %i.", status);
821 return status;
822 }
823 } else if (conf->format == CAMQP_FORMAT_JSON) {
824 size_t bfree = sizeof(buffer);
825 size_t bfill = 0;
826
827 format_json_initialize(buffer, &bfill, &bfree);
828 format_json_value_list(buffer, &bfill, &bfree, ds, vl, conf->store_rates);
829 format_json_finalize(buffer, &bfill, &bfree);
830 } else if (conf->format == CAMQP_FORMAT_GRAPHITE) {
831 status =
832 format_graphite(buffer, sizeof(buffer), ds, vl, conf->prefix,
833 conf->postfix, conf->escape_char, conf->graphite_flags);
834 if (status != 0) {
835 ERROR("amqp plugin: format_graphite failed with status %i.", status);
836 return status;
837 }
838 } else {
839 ERROR("amqp plugin: Invalid format (%i).", conf->format);
840 return -1;
841 }
842
843 pthread_mutex_lock(&conf->lock);
844 status = camqp_write_locked(conf, buffer, routing_key);
845 pthread_mutex_unlock(&conf->lock);
846
847 return status;
848 } /* }}} int camqp_write */
849
850 /*
851 * Config handling
852 */
camqp_config_set_format(oconfig_item_t * ci,camqp_config_t * conf)853 static int camqp_config_set_format(oconfig_item_t *ci, /* {{{ */
854 camqp_config_t *conf) {
855 char *string;
856 int status;
857
858 string = NULL;
859 status = cf_util_get_string(ci, &string);
860 if (status != 0)
861 return status;
862
863 assert(string != NULL);
864 if (strcasecmp("Command", string) == 0)
865 conf->format = CAMQP_FORMAT_COMMAND;
866 else if (strcasecmp("JSON", string) == 0)
867 conf->format = CAMQP_FORMAT_JSON;
868 else if (strcasecmp("Graphite", string) == 0)
869 conf->format = CAMQP_FORMAT_GRAPHITE;
870 else {
871 WARNING("amqp plugin: Invalid format string: %s", string);
872 }
873
874 free(string);
875
876 return 0;
877 } /* }}} int config_set_string */
878
camqp_config_connection(oconfig_item_t * ci,bool publish)879 static int camqp_config_connection(oconfig_item_t *ci, /* {{{ */
880 bool publish) {
881 camqp_config_t *conf;
882 int status;
883
884 conf = calloc(1, sizeof(*conf));
885 if (conf == NULL) {
886 ERROR("amqp plugin: calloc failed.");
887 return ENOMEM;
888 }
889
890 /* Initialize "conf" {{{ */
891 conf->publish = publish;
892 conf->name = NULL;
893 conf->format = CAMQP_FORMAT_COMMAND;
894 conf->hosts = NULL;
895 conf->hosts_count = 0;
896 conf->port = 5672;
897 conf->vhost = NULL;
898 conf->user = NULL;
899 conf->password = NULL;
900 conf->tls_enabled = false;
901 conf->tls_verify_peer = true;
902 conf->tls_verify_hostname = true;
903 conf->tls_cacert = NULL;
904 conf->tls_client_cert = NULL;
905 conf->tls_client_key = NULL;
906 conf->exchange = NULL;
907 conf->routing_key = NULL;
908 conf->connection_retry_delay = 0;
909
910 /* publish only */
911 conf->delivery_mode = CAMQP_DM_VOLATILE;
912 conf->store_rates = false;
913 conf->graphite_flags = 0;
914 /* publish & graphite only */
915 conf->prefix = NULL;
916 conf->postfix = NULL;
917 conf->escape_char = '_';
918 /* subscribe only */
919 conf->exchange_type = NULL;
920 conf->queue = NULL;
921 conf->queue_durable = false;
922 conf->queue_auto_delete = true;
923 /* general */
924 conf->connection = NULL;
925 pthread_mutex_init(&conf->lock, /* attr = */ NULL);
926 /* }}} */
927
928 status = cf_util_get_string(ci, &conf->name);
929 if (status != 0) {
930 sfree(conf);
931 return status;
932 }
933
934 for (int i = 0; i < ci->children_num; i++) {
935 oconfig_item_t *child = ci->children + i;
936
937 if (strcasecmp("Host", child->key) == 0) {
938 for (int j = 0; j < child->values_num; j++) {
939 if (child->values[j].type != OCONFIG_TYPE_STRING) {
940 status = EINVAL;
941 ERROR("amqp plugin: Host arguments must be strings");
942 break;
943 }
944
945 status = strarray_add(&conf->hosts, &conf->hosts_count,
946 child->values[j].value.string);
947 if (status) {
948 ERROR("amqp plugin: Host configuration failed: %d", status);
949 break;
950 }
951 }
952 } else if (strcasecmp("Port", child->key) == 0) {
953 status = cf_util_get_port_number(child);
954 if (status > 0) {
955 conf->port = status;
956 status = 0;
957 }
958 } else if (strcasecmp("VHost", child->key) == 0)
959 status = cf_util_get_string(child, &conf->vhost);
960 else if (strcasecmp("User", child->key) == 0)
961 status = cf_util_get_string(child, &conf->user);
962 else if (strcasecmp("Password", child->key) == 0)
963 status = cf_util_get_string(child, &conf->password);
964 else if (strcasecmp("TLSEnabled", child->key) == 0)
965 status = cf_util_get_boolean(child, &conf->tls_enabled);
966 else if (strcasecmp("TLSVerifyPeer", child->key) == 0)
967 status = cf_util_get_boolean(child, &conf->tls_verify_peer);
968 else if (strcasecmp("TLSVerifyHostName", child->key) == 0)
969 status = cf_util_get_boolean(child, &conf->tls_verify_hostname);
970 else if (strcasecmp("TLSCACert", child->key) == 0)
971 status = cf_util_get_string(child, &conf->tls_cacert);
972 else if (strcasecmp("TLSClientCert", child->key) == 0)
973 status = cf_util_get_string(child, &conf->tls_client_cert);
974 else if (strcasecmp("TLSClientKey", child->key) == 0)
975 status = cf_util_get_string(child, &conf->tls_client_key);
976 else if (strcasecmp("Exchange", child->key) == 0)
977 status = cf_util_get_string(child, &conf->exchange);
978 else if (strcasecmp("ExchangeType", child->key) == 0)
979 status = cf_util_get_string(child, &conf->exchange_type);
980 else if ((strcasecmp("Queue", child->key) == 0) && !publish)
981 status = cf_util_get_string(child, &conf->queue);
982 else if ((strcasecmp("QueueDurable", child->key) == 0) && !publish)
983 status = cf_util_get_boolean(child, &conf->queue_durable);
984 else if ((strcasecmp("QueueAutoDelete", child->key) == 0) && !publish)
985 status = cf_util_get_boolean(child, &conf->queue_auto_delete);
986 else if (strcasecmp("RoutingKey", child->key) == 0)
987 status = cf_util_get_string(child, &conf->routing_key);
988 else if ((strcasecmp("Persistent", child->key) == 0) && publish) {
989 bool tmp = 0;
990 status = cf_util_get_boolean(child, &tmp);
991 if (tmp)
992 conf->delivery_mode = CAMQP_DM_PERSISTENT;
993 else
994 conf->delivery_mode = CAMQP_DM_VOLATILE;
995 } else if ((strcasecmp("StoreRates", child->key) == 0) && publish) {
996 status = cf_util_get_boolean(child, &conf->store_rates);
997 (void)cf_util_get_flag(child, &conf->graphite_flags,
998 GRAPHITE_STORE_RATES);
999 } else if ((strcasecmp("Format", child->key) == 0) && publish)
1000 status = camqp_config_set_format(child, conf);
1001 else if ((strcasecmp("GraphiteSeparateInstances", child->key) == 0) &&
1002 publish)
1003 status = cf_util_get_flag(child, &conf->graphite_flags,
1004 GRAPHITE_SEPARATE_INSTANCES);
1005 else if ((strcasecmp("GraphiteAlwaysAppendDS", child->key) == 0) && publish)
1006 status = cf_util_get_flag(child, &conf->graphite_flags,
1007 GRAPHITE_ALWAYS_APPEND_DS);
1008 else if ((strcasecmp("GraphitePreserveSeparator", child->key) == 0) &&
1009 publish)
1010 status = cf_util_get_flag(child, &conf->graphite_flags,
1011 GRAPHITE_PRESERVE_SEPARATOR);
1012 else if ((strcasecmp("GraphitePrefix", child->key) == 0) && publish)
1013 status = cf_util_get_string(child, &conf->prefix);
1014 else if ((strcasecmp("GraphitePostfix", child->key) == 0) && publish)
1015 status = cf_util_get_string(child, &conf->postfix);
1016 else if ((strcasecmp("GraphiteEscapeChar", child->key) == 0) && publish) {
1017 char *tmp_buff = NULL;
1018 status = cf_util_get_string(child, &tmp_buff);
1019 if (strlen(tmp_buff) > 1)
1020 WARNING("amqp plugin: The option \"GraphiteEscapeChar\" handles "
1021 "only one character. Others will be ignored.");
1022 conf->escape_char = tmp_buff[0];
1023 sfree(tmp_buff);
1024 } else if (strcasecmp("ConnectionRetryDelay", child->key) == 0)
1025 status = cf_util_get_int(child, &conf->connection_retry_delay);
1026 else
1027 WARNING("amqp plugin: Ignoring unknown "
1028 "configuration option \"%s\".",
1029 child->key);
1030
1031 if (status != 0)
1032 break;
1033 } /* for (i = 0; i < ci->children_num; i++) */
1034
1035 if (status == 0 && conf->hosts_count == 0) {
1036 status = strarray_add(&conf->hosts, &conf->hosts_count, "localhost");
1037 if (status)
1038 ERROR("amqp plugin: Host configuration failed: %d", status);
1039 }
1040
1041 if ((status == 0) && (conf->exchange == NULL)) {
1042 if (conf->exchange_type != NULL)
1043 WARNING("amqp plugin: The option \"ExchangeType\" was given "
1044 "without the \"Exchange\" option. It will be ignored.");
1045
1046 if (!publish && (conf->routing_key != NULL))
1047 WARNING("amqp plugin: The option \"RoutingKey\" was given "
1048 "without the \"Exchange\" option. It will be ignored.");
1049 }
1050
1051 #if !defined(AMQP_VERSION) || AMQP_VERSION < 0x00040000
1052 if (status == 0 && conf->tls_enabled) {
1053 ERROR("amqp plugin: TLSEnabled is set but not supported. "
1054 "rebuild collectd with rabbitmq-c >= 0.4");
1055 status = 1;
1056 }
1057 #endif
1058 #if !defined(AMQP_VERSION) || AMQP_VERSION < 0x00080000
1059 if (status == 0 && (!conf->tls_verify_peer || !conf->tls_verify_hostname)) {
1060 ERROR("amqp plugin: disabling TLSVerify* is not supported. "
1061 "rebuild collectd with rabbitmq-c >= 0.8");
1062 status = 1;
1063 }
1064 #endif
1065 if (status == 0 &&
1066 (conf->tls_client_cert != NULL || conf->tls_client_key != NULL)) {
1067 if (conf->tls_client_cert == NULL || conf->tls_client_key == NULL) {
1068 ERROR("amqp plugin: only one of TLSClientCert/TLSClientKey is "
1069 "configured. need both or neither.");
1070 status = 1;
1071 }
1072 }
1073
1074 if (status != 0) {
1075 camqp_config_free(conf);
1076 return status;
1077 }
1078
1079 if (conf->exchange != NULL) {
1080 DEBUG("amqp plugin: camqp_config_connection: exchange = %s;",
1081 conf->exchange);
1082 }
1083
1084 if (publish) {
1085 char cbname[128];
1086 ssnprintf(cbname, sizeof(cbname), "amqp/%s", conf->name);
1087
1088 status = plugin_register_write(cbname, camqp_write,
1089 &(user_data_t){
1090 .data = conf,
1091 .free_func = camqp_config_free,
1092 });
1093 if (status != 0) {
1094 camqp_config_free(conf);
1095 return status;
1096 }
1097 } else {
1098 status = camqp_subscribe_init(conf);
1099 if (status != 0) {
1100 camqp_config_free(conf);
1101 return status;
1102 }
1103 }
1104
1105 return 0;
1106 } /* }}} int camqp_config_connection */
1107
camqp_config(oconfig_item_t * ci)1108 static int camqp_config(oconfig_item_t *ci) /* {{{ */
1109 {
1110 for (int i = 0; i < ci->children_num; i++) {
1111 oconfig_item_t *child = ci->children + i;
1112
1113 if (strcasecmp("Publish", child->key) == 0)
1114 camqp_config_connection(child, /* publish = */ true);
1115 else if (strcasecmp("Subscribe", child->key) == 0)
1116 camqp_config_connection(child, /* publish = */ false);
1117 else
1118 WARNING("amqp plugin: Ignoring unknown config option \"%s\".",
1119 child->key);
1120 } /* for (ci->children_num) */
1121
1122 return 0;
1123 } /* }}} int camqp_config */
1124
module_register(void)1125 void module_register(void) {
1126 plugin_register_complex_config("amqp", camqp_config);
1127 plugin_register_shutdown("amqp", camqp_shutdown);
1128 } /* void module_register */
1129