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