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 verplant.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 <pthread.h>
38 #include <amqp.h>
39 #include <amqp_framing.h>
41 #ifdef HAVE_AMQP_TCP_SOCKET_H
42 # include <amqp_tcp_socket.h>
43 #endif
44 #ifdef HAVE_AMQP_SOCKET_H
45 # include <amqp_socket.h>
46 #endif
47 #ifdef HAVE_AMQP_TCP_SOCKET
48 #if defined HAVE_DECL_AMQP_SOCKET_CLOSE && !HAVE_DECL_AMQP_SOCKET_CLOSE
49 /* rabbitmq-c does not currently ship amqp_socket.h
50 * and, thus, does not define this function. */
51 int amqp_socket_close(amqp_socket_t *);
52 #endif
53 #endif
55 /* Defines for the delivery mode. I have no idea why they're not defined by the
56 * library.. */
57 #define CAMQP_DM_VOLATILE 1
58 #define CAMQP_DM_PERSISTENT 2
60 #define CAMQP_FORMAT_COMMAND 1
61 #define CAMQP_FORMAT_JSON 2
62 #define CAMQP_FORMAT_GRAPHITE 3
64 #define CAMQP_CHANNEL 1
66 /*
67 * Data types
68 */
69 struct camqp_config_s
70 {
71 _Bool publish;
72 char *name;
74 char *host;
75 int port;
76 char *vhost;
77 char *user;
78 char *password;
80 char *exchange;
81 char *routing_key;
83 /* publish only */
84 uint8_t delivery_mode;
85 _Bool store_rates;
86 int format;
87 /* publish & graphite format only */
88 char *prefix;
89 char *postfix;
90 char escape_char;
91 unsigned int graphite_flags;
93 /* subscribe only */
94 char *exchange_type;
95 char *queue;
97 amqp_connection_state_t connection;
98 pthread_mutex_t lock;
99 };
100 typedef struct camqp_config_s camqp_config_t;
102 /*
103 * Global variables
104 */
105 static const char *def_host = "localhost";
106 static const char *def_vhost = "/";
107 static const char *def_user = "guest";
108 static const char *def_password = "guest";
109 static const char *def_exchange = "amq.fanout";
111 static pthread_t *subscriber_threads = NULL;
112 static size_t subscriber_threads_num = 0;
113 static _Bool subscriber_threads_running = 1;
115 #define CONF(c,f) (((c)->f != NULL) ? (c)->f : def_##f)
117 /*
118 * Functions
119 */
120 static void camqp_close_connection (camqp_config_t *conf) /* {{{ */
121 {
122 int sockfd;
124 if ((conf == NULL) || (conf->connection == NULL))
125 return;
127 sockfd = amqp_get_sockfd (conf->connection);
128 amqp_channel_close (conf->connection, CAMQP_CHANNEL, AMQP_REPLY_SUCCESS);
129 amqp_connection_close (conf->connection, AMQP_REPLY_SUCCESS);
130 amqp_destroy_connection (conf->connection);
131 close (sockfd);
132 conf->connection = NULL;
133 } /* }}} void camqp_close_connection */
135 static void camqp_config_free (void *ptr) /* {{{ */
136 {
137 camqp_config_t *conf = ptr;
139 if (conf == NULL)
140 return;
142 camqp_close_connection (conf);
144 sfree (conf->name);
145 sfree (conf->host);
146 sfree (conf->vhost);
147 sfree (conf->user);
148 sfree (conf->password);
149 sfree (conf->exchange);
150 sfree (conf->exchange_type);
151 sfree (conf->queue);
152 sfree (conf->routing_key);
153 sfree (conf->prefix);
154 sfree (conf->postfix);
157 sfree (conf);
158 } /* }}} void camqp_config_free */
160 static char *camqp_bytes_cstring (amqp_bytes_t *in) /* {{{ */
161 {
162 char *ret;
164 if ((in == NULL) || (in->bytes == NULL))
165 return (NULL);
167 ret = malloc (in->len + 1);
168 if (ret == NULL)
169 return (NULL);
171 memcpy (ret, in->bytes, in->len);
172 ret[in->len] = 0;
174 return (ret);
175 } /* }}} char *camqp_bytes_cstring */
177 static _Bool camqp_is_error (camqp_config_t *conf) /* {{{ */
178 {
179 amqp_rpc_reply_t r;
181 r = amqp_get_rpc_reply (conf->connection);
182 if (r.reply_type == AMQP_RESPONSE_NORMAL)
183 return (0);
185 return (1);
186 } /* }}} _Bool camqp_is_error */
188 static char *camqp_strerror (camqp_config_t *conf, /* {{{ */
189 char *buffer, size_t buffer_size)
190 {
191 amqp_rpc_reply_t r;
193 r = amqp_get_rpc_reply (conf->connection);
194 switch (r.reply_type)
195 {
196 case AMQP_RESPONSE_NORMAL:
197 sstrncpy (buffer, "Success", sizeof (buffer));
198 break;
200 case AMQP_RESPONSE_NONE:
201 sstrncpy (buffer, "Missing RPC reply type", sizeof (buffer));
202 break;
204 case AMQP_RESPONSE_LIBRARY_EXCEPTION:
205 #if HAVE_AMQP_RPC_REPLY_T_LIBRARY_ERRNO
206 if (r.library_errno)
207 return (sstrerror (r.library_errno, buffer, buffer_size));
208 #else
209 if (r.library_error)
210 return (sstrerror (r.library_error, buffer, buffer_size));
211 #endif
212 else
213 sstrncpy (buffer, "End of stream", sizeof (buffer));
214 break;
216 case AMQP_RESPONSE_SERVER_EXCEPTION:
217 if (r.reply.id == AMQP_CONNECTION_CLOSE_METHOD)
218 {
219 amqp_connection_close_t *m = r.reply.decoded;
220 char *tmp = camqp_bytes_cstring (&m->reply_text);
221 ssnprintf (buffer, buffer_size, "Server connection error %d: %s",
222 m->reply_code, tmp);
223 sfree (tmp);
224 }
225 else if (r.reply.id == AMQP_CHANNEL_CLOSE_METHOD)
226 {
227 amqp_channel_close_t *m = r.reply.decoded;
228 char *tmp = camqp_bytes_cstring (&m->reply_text);
229 ssnprintf (buffer, buffer_size, "Server channel error %d: %s",
230 m->reply_code, tmp);
231 sfree (tmp);
232 }
233 else
234 {
235 ssnprintf (buffer, buffer_size, "Server error method %#"PRIx32,
236 r.reply.id);
237 }
238 break;
240 default:
241 ssnprintf (buffer, buffer_size, "Unknown reply type %i",
242 (int) r.reply_type);
243 }
245 return (buffer);
246 } /* }}} char *camqp_strerror */
248 #if HAVE_AMQP_RPC_REPLY_T_LIBRARY_ERRNO
249 static int camqp_create_exchange (camqp_config_t *conf) /* {{{ */
250 {
251 amqp_exchange_declare_ok_t *ed_ret;
253 if (conf->exchange_type == NULL)
254 return (0);
256 ed_ret = amqp_exchange_declare (conf->connection,
257 /* channel = */ CAMQP_CHANNEL,
258 /* exchange = */ amqp_cstring_bytes (conf->exchange),
259 /* type = */ amqp_cstring_bytes (conf->exchange_type),
260 /* passive = */ 0,
261 /* durable = */ 0,
262 /* auto_delete = */ 1,
263 /* arguments = */ AMQP_EMPTY_TABLE);
264 if ((ed_ret == NULL) && camqp_is_error (conf))
265 {
266 char errbuf[1024];
267 ERROR ("amqp plugin: amqp_exchange_declare failed: %s",
268 camqp_strerror (conf, errbuf, sizeof (errbuf)));
269 camqp_close_connection (conf);
270 return (-1);
271 }
273 INFO ("amqp plugin: Successfully created exchange \"%s\" "
274 "with type \"%s\".",
275 conf->exchange, conf->exchange_type);
277 return (0);
278 } /* }}} int camqp_create_exchange */
279 #else
280 static int camqp_create_exchange (camqp_config_t *conf) /* {{{ */
281 {
282 amqp_exchange_declare_ok_t *ed_ret;
283 amqp_table_t argument_table;
284 struct amqp_table_entry_t_ argument_table_entries[1];
286 if (conf->exchange_type == NULL)
287 return (0);
289 /* Valid arguments: "auto_delete", "internal" */
290 argument_table.num_entries = STATIC_ARRAY_SIZE (argument_table_entries);
291 argument_table.entries = argument_table_entries;
292 argument_table_entries[0].key = amqp_cstring_bytes ("auto_delete");
293 argument_table_entries[0].value.kind = AMQP_FIELD_KIND_BOOLEAN;
294 argument_table_entries[0].value.value.boolean = 1;
296 ed_ret = amqp_exchange_declare (conf->connection,
297 /* channel = */ CAMQP_CHANNEL,
298 /* exchange = */ amqp_cstring_bytes (conf->exchange),
299 /* type = */ amqp_cstring_bytes (conf->exchange_type),
300 /* passive = */ 0,
301 /* durable = */ 0,
302 /* arguments = */ argument_table);
303 if ((ed_ret == NULL) && camqp_is_error (conf))
304 {
305 char errbuf[1024];
306 ERROR ("amqp plugin: amqp_exchange_declare failed: %s",
307 camqp_strerror (conf, errbuf, sizeof (errbuf)));
308 camqp_close_connection (conf);
309 return (-1);
310 }
312 INFO ("amqp plugin: Successfully created exchange \"%s\" "
313 "with type \"%s\".",
314 conf->exchange, conf->exchange_type);
316 return (0);
317 } /* }}} int camqp_create_exchange */
318 #endif
320 static int camqp_setup_queue (camqp_config_t *conf) /* {{{ */
321 {
322 amqp_queue_declare_ok_t *qd_ret;
323 amqp_basic_consume_ok_t *cm_ret;
325 qd_ret = amqp_queue_declare (conf->connection,
326 /* channel = */ CAMQP_CHANNEL,
327 /* queue = */ (conf->queue != NULL)
328 ? amqp_cstring_bytes (conf->queue)
329 : AMQP_EMPTY_BYTES,
330 /* passive = */ 0,
331 /* durable = */ 0,
332 /* exclusive = */ 0,
333 /* auto_delete = */ 1,
334 /* arguments = */ AMQP_EMPTY_TABLE);
335 if (qd_ret == NULL)
336 {
337 ERROR ("amqp plugin: amqp_queue_declare failed.");
338 camqp_close_connection (conf);
339 return (-1);
340 }
342 if (conf->queue == NULL)
343 {
344 conf->queue = camqp_bytes_cstring (&qd_ret->queue);
345 if (conf->queue == NULL)
346 {
347 ERROR ("amqp plugin: camqp_bytes_cstring failed.");
348 camqp_close_connection (conf);
349 return (-1);
350 }
352 INFO ("amqp plugin: Created queue \"%s\".", conf->queue);
353 }
354 DEBUG ("amqp plugin: Successfully created queue \"%s\".", conf->queue);
356 /* bind to an exchange */
357 if (conf->exchange != NULL)
358 {
359 amqp_queue_bind_ok_t *qb_ret;
361 assert (conf->queue != NULL);
362 qb_ret = amqp_queue_bind (conf->connection,
363 /* channel = */ CAMQP_CHANNEL,
364 /* queue = */ amqp_cstring_bytes (conf->queue),
365 /* exchange = */ amqp_cstring_bytes (conf->exchange),
366 /* routing_key = */ (conf->routing_key != NULL)
367 ? amqp_cstring_bytes (conf->routing_key)
368 : AMQP_EMPTY_BYTES,
369 /* arguments = */ AMQP_EMPTY_TABLE);
370 if ((qb_ret == NULL) && camqp_is_error (conf))
371 {
372 char errbuf[1024];
373 ERROR ("amqp plugin: amqp_queue_bind failed: %s",
374 camqp_strerror (conf, errbuf, sizeof (errbuf)));
375 camqp_close_connection (conf);
376 return (-1);
377 }
379 DEBUG ("amqp plugin: Successfully bound queue \"%s\" to exchange \"%s\".",
380 conf->queue, conf->exchange);
381 } /* if (conf->exchange != NULL) */
383 cm_ret = amqp_basic_consume (conf->connection,
384 /* channel = */ CAMQP_CHANNEL,
385 /* queue = */ amqp_cstring_bytes (conf->queue),
386 /* consumer_tag = */ AMQP_EMPTY_BYTES,
387 /* no_local = */ 0,
388 /* no_ack = */ 1,
389 /* exclusive = */ 0,
390 /* arguments = */ AMQP_EMPTY_TABLE
391 );
392 if ((cm_ret == NULL) && camqp_is_error (conf))
393 {
394 char errbuf[1024];
395 ERROR ("amqp plugin: amqp_basic_consume failed: %s",
396 camqp_strerror (conf, errbuf, sizeof (errbuf)));
397 camqp_close_connection (conf);
398 return (-1);
399 }
401 return (0);
402 } /* }}} int camqp_setup_queue */
404 static int camqp_connect (camqp_config_t *conf) /* {{{ */
405 {
406 amqp_rpc_reply_t reply;
407 int status;
408 #ifdef HAVE_AMQP_TCP_SOCKET
409 amqp_socket_t *socket;
410 #else
411 int sockfd;
412 #endif
414 if (conf->connection != NULL)
415 return (0);
417 conf->connection = amqp_new_connection ();
418 if (conf->connection == NULL)
419 {
420 ERROR ("amqp plugin: amqp_new_connection failed.");
421 return (ENOMEM);
422 }
424 #ifdef HAVE_AMQP_TCP_SOCKET
425 # define CLOSE_SOCKET() /* amqp_destroy_connection() closes the socket for us */
426 /* TODO: add support for SSL using amqp_ssl_socket_new
427 * and related functions */
428 socket = amqp_tcp_socket_new (conf->connection);
429 if (! socket)
430 {
431 ERROR ("amqp plugin: amqp_tcp_socket_new failed.");
432 amqp_destroy_connection (conf->connection);
433 conf->connection = NULL;
434 return (ENOMEM);
435 }
437 status = amqp_socket_open (socket, CONF(conf, host), conf->port);
438 if (status < 0)
439 {
440 char errbuf[1024];
441 status *= -1;
442 ERROR ("amqp plugin: amqp_socket_open failed: %s",
443 sstrerror (status, errbuf, sizeof (errbuf)));
444 amqp_destroy_connection (conf->connection);
445 conf->connection = NULL;
446 return (status);
447 }
448 #else /* HAVE_AMQP_TCP_SOCKET */
449 # define CLOSE_SOCKET() close(sockfd)
450 /* this interface is deprecated as of rabbitmq-c 0.4 */
451 sockfd = amqp_open_socket (CONF(conf, host), conf->port);
452 if (sockfd < 0)
453 {
454 char errbuf[1024];
455 status = (-1) * sockfd;
456 ERROR ("amqp plugin: amqp_open_socket failed: %s",
457 sstrerror (status, errbuf, sizeof (errbuf)));
458 amqp_destroy_connection (conf->connection);
459 conf->connection = NULL;
460 return (status);
461 }
462 amqp_set_sockfd (conf->connection, sockfd);
463 #endif
465 reply = amqp_login (conf->connection, CONF(conf, vhost),
466 /* channel max = */ 0,
467 /* frame max = */ 131072,
468 /* heartbeat = */ 0,
469 /* authentication = */ AMQP_SASL_METHOD_PLAIN,
470 CONF(conf, user), CONF(conf, password));
471 if (reply.reply_type != AMQP_RESPONSE_NORMAL)
472 {
473 ERROR ("amqp plugin: amqp_login (vhost = %s, user = %s) failed.",
474 CONF(conf, vhost), CONF(conf, user));
475 amqp_destroy_connection (conf->connection);
476 CLOSE_SOCKET ();
477 conf->connection = NULL;
478 return (1);
479 }
481 amqp_channel_open (conf->connection, /* channel = */ 1);
482 /* FIXME: Is checking "reply.reply_type" really correct here? How does
483 * it get set? --octo */
484 if (reply.reply_type != AMQP_RESPONSE_NORMAL)
485 {
486 ERROR ("amqp plugin: amqp_channel_open failed.");
487 amqp_connection_close (conf->connection, AMQP_REPLY_SUCCESS);
488 amqp_destroy_connection (conf->connection);
489 CLOSE_SOCKET ();
490 conf->connection = NULL;
491 return (1);
492 }
494 INFO ("amqp plugin: Successfully opened connection to vhost \"%s\" "
495 "on %s:%i.", CONF(conf, vhost), CONF(conf, host), conf->port);
497 status = camqp_create_exchange (conf);
498 if (status != 0)
499 return (status);
501 if (!conf->publish)
502 return (camqp_setup_queue (conf));
503 return (0);
504 } /* }}} int camqp_connect */
506 static int camqp_shutdown (void) /* {{{ */
507 {
508 size_t i;
510 DEBUG ("amqp plugin: Shutting down %zu subscriber threads.",
511 subscriber_threads_num);
513 subscriber_threads_running = 0;
514 for (i = 0; i < subscriber_threads_num; i++)
515 {
516 /* FIXME: Sending a signal is not very elegant here. Maybe find out how
517 * to use a timeout in the thread and check for the variable in regular
518 * intervals. */
519 pthread_kill (subscriber_threads[i], SIGTERM);
520 pthread_join (subscriber_threads[i], /* retval = */ NULL);
521 }
523 subscriber_threads_num = 0;
524 sfree (subscriber_threads);
526 DEBUG ("amqp plugin: All subscriber threads exited.");
528 return (0);
529 } /* }}} int camqp_shutdown */
531 /*
532 * Subscribing code
533 */
534 static int camqp_read_body (camqp_config_t *conf, /* {{{ */
535 size_t body_size, const char *content_type)
536 {
537 char body[body_size + 1];
538 char *body_ptr;
539 size_t received;
540 amqp_frame_t frame;
541 int status;
543 memset (body, 0, sizeof (body));
544 body_ptr = &body[0];
545 received = 0;
547 while (received < body_size)
548 {
549 status = amqp_simple_wait_frame (conf->connection, &frame);
550 if (status < 0)
551 {
552 char errbuf[1024];
553 status = (-1) * status;
554 ERROR ("amqp plugin: amqp_simple_wait_frame failed: %s",
555 sstrerror (status, errbuf, sizeof (errbuf)));
556 camqp_close_connection (conf);
557 return (status);
558 }
560 if (frame.frame_type != AMQP_FRAME_BODY)
561 {
562 NOTICE ("amqp plugin: Unexpected frame type: %#"PRIx8,
563 frame.frame_type);
564 return (-1);
565 }
567 if ((body_size - received) < frame.payload.body_fragment.len)
568 {
569 WARNING ("amqp plugin: Body is larger than indicated by header.");
570 return (-1);
571 }
573 memcpy (body_ptr, frame.payload.body_fragment.bytes,
574 frame.payload.body_fragment.len);
575 body_ptr += frame.payload.body_fragment.len;
576 received += frame.payload.body_fragment.len;
577 } /* while (received < body_size) */
579 if (strcasecmp ("text/collectd", content_type) == 0)
580 {
581 status = handle_putval (stderr, body);
582 if (status != 0)
583 ERROR ("amqp plugin: handle_putval failed with status %i.",
584 status);
585 return (status);
586 }
587 else if (strcasecmp ("application/json", content_type) == 0)
588 {
589 ERROR ("amqp plugin: camqp_read_body: Parsing JSON data has not "
590 "been implemented yet. FIXME!");
591 return (0);
592 }
593 else
594 {
595 ERROR ("amqp plugin: camqp_read_body: Unknown content type \"%s\".",
596 content_type);
597 return (EINVAL);
598 }
600 /* not reached */
601 return (0);
602 } /* }}} int camqp_read_body */
604 static int camqp_read_header (camqp_config_t *conf) /* {{{ */
605 {
606 int status;
607 amqp_frame_t frame;
608 amqp_basic_properties_t *properties;
609 char *content_type;
611 status = amqp_simple_wait_frame (conf->connection, &frame);
612 if (status < 0)
613 {
614 char errbuf[1024];
615 status = (-1) * status;
616 ERROR ("amqp plugin: amqp_simple_wait_frame failed: %s",
617 sstrerror (status, errbuf, sizeof (errbuf)));
618 camqp_close_connection (conf);
619 return (status);
620 }
622 if (frame.frame_type != AMQP_FRAME_HEADER)
623 {
624 NOTICE ("amqp plugin: Unexpected frame type: %#"PRIx8,
625 frame.frame_type);
626 return (-1);
627 }
629 properties = frame.payload.properties.decoded;
630 content_type = camqp_bytes_cstring (&properties->content_type);
631 if (content_type == NULL)
632 {
633 ERROR ("amqp plugin: Unable to determine content type.");
634 return (-1);
635 }
637 status = camqp_read_body (conf,
638 (size_t) frame.payload.properties.body_size,
639 content_type);
641 sfree (content_type);
642 return (status);
643 } /* }}} int camqp_read_header */
645 static void *camqp_subscribe_thread (void *user_data) /* {{{ */
646 {
647 camqp_config_t *conf = user_data;
648 int status;
650 cdtime_t interval = plugin_get_interval ();
652 while (subscriber_threads_running)
653 {
654 amqp_frame_t frame;
656 status = camqp_connect (conf);
657 if (status != 0)
658 {
659 struct timespec ts_interval;
660 ERROR ("amqp plugin: camqp_connect failed. "
661 "Will sleep for %.3f seconds.",
662 CDTIME_T_TO_DOUBLE (interval));
663 CDTIME_T_TO_TIMESPEC (interval, &ts_interval);
664 nanosleep (&ts_interval, /* remaining = */ NULL);
665 continue;
666 }
668 status = amqp_simple_wait_frame (conf->connection, &frame);
669 if (status < 0)
670 {
671 struct timespec ts_interval;
672 ERROR ("amqp plugin: amqp_simple_wait_frame failed. "
673 "Will sleep for %.3f seconds.",
674 CDTIME_T_TO_DOUBLE (interval));
675 camqp_close_connection (conf);
676 CDTIME_T_TO_TIMESPEC (interval, &ts_interval);
677 nanosleep (&ts_interval, /* remaining = */ NULL);
678 continue;
679 }
681 if (frame.frame_type != AMQP_FRAME_METHOD)
682 {
683 DEBUG ("amqp plugin: Unexpected frame type: %#"PRIx8,
684 frame.frame_type);
685 continue;
686 }
688 if (frame.payload.method.id != AMQP_BASIC_DELIVER_METHOD)
689 {
690 DEBUG ("amqp plugin: Unexpected method id: %#"PRIx32,
691 frame.payload.method.id);
692 continue;
693 }
695 status = camqp_read_header (conf);
697 amqp_maybe_release_buffers (conf->connection);
698 } /* while (subscriber_threads_running) */
700 camqp_config_free (conf);
701 pthread_exit (NULL);
702 return (NULL);
703 } /* }}} void *camqp_subscribe_thread */
705 static int camqp_subscribe_init (camqp_config_t *conf) /* {{{ */
706 {
707 int status;
708 pthread_t *tmp;
710 tmp = realloc (subscriber_threads,
711 sizeof (*subscriber_threads) * (subscriber_threads_num + 1));
712 if (tmp == NULL)
713 {
714 ERROR ("amqp plugin: realloc failed.");
715 camqp_config_free (conf);
716 return (ENOMEM);
717 }
718 subscriber_threads = tmp;
719 tmp = subscriber_threads + subscriber_threads_num;
720 memset (tmp, 0, sizeof (*tmp));
722 status = plugin_thread_create (tmp, /* attr = */ NULL,
723 camqp_subscribe_thread, conf);
724 if (status != 0)
725 {
726 char errbuf[1024];
727 ERROR ("amqp plugin: pthread_create failed: %s",
728 sstrerror (status, errbuf, sizeof (errbuf)));
729 camqp_config_free (conf);
730 return (status);
731 }
733 subscriber_threads_num++;
735 return (0);
736 } /* }}} int camqp_subscribe_init */
738 /*
739 * Publishing code
740 */
741 /* XXX: You must hold "conf->lock" when calling this function! */
742 static int camqp_write_locked (camqp_config_t *conf, /* {{{ */
743 const char *buffer, const char *routing_key)
744 {
745 amqp_basic_properties_t props;
746 int status;
748 status = camqp_connect (conf);
749 if (status != 0)
750 return (status);
752 memset (&props, 0, sizeof (props));
753 props._flags = AMQP_BASIC_CONTENT_TYPE_FLAG
754 | AMQP_BASIC_DELIVERY_MODE_FLAG
755 | AMQP_BASIC_APP_ID_FLAG;
756 if (conf->format == CAMQP_FORMAT_COMMAND)
757 props.content_type = amqp_cstring_bytes("text/collectd");
758 else if (conf->format == CAMQP_FORMAT_JSON)
759 props.content_type = amqp_cstring_bytes("application/json");
760 else if (conf->format == CAMQP_FORMAT_GRAPHITE)
761 props.content_type = amqp_cstring_bytes("text/graphite");
762 else
763 assert (23 == 42);
764 props.delivery_mode = conf->delivery_mode;
765 props.app_id = amqp_cstring_bytes("collectd");
767 status = amqp_basic_publish(conf->connection,
768 /* channel = */ 1,
769 amqp_cstring_bytes(CONF(conf, exchange)),
770 amqp_cstring_bytes (routing_key),
771 /* mandatory = */ 0,
772 /* immediate = */ 0,
773 &props,
774 amqp_cstring_bytes(buffer));
775 if (status != 0)
776 {
777 ERROR ("amqp plugin: amqp_basic_publish failed with status %i.",
778 status);
779 camqp_close_connection (conf);
780 }
782 return (status);
783 } /* }}} int camqp_write_locked */
785 static int camqp_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
786 user_data_t *user_data)
787 {
788 camqp_config_t *conf = user_data->data;
789 char routing_key[6 * DATA_MAX_NAME_LEN];
790 char buffer[4096];
791 int status;
793 if ((ds == NULL) || (vl == NULL) || (conf == NULL))
794 return (EINVAL);
796 memset (buffer, 0, sizeof (buffer));
798 if (conf->routing_key != NULL)
799 {
800 sstrncpy (routing_key, conf->routing_key, sizeof (routing_key));
801 }
802 else
803 {
804 size_t i;
805 ssnprintf (routing_key, sizeof (routing_key), "collectd/%s/%s/%s/%s/%s",
806 vl->host,
807 vl->plugin, vl->plugin_instance,
808 vl->type, vl->type_instance);
810 /* Switch slashes (the only character forbidden by collectd) and dots
811 * (the separation character used by AMQP). */
812 for (i = 0; routing_key[i] != 0; i++)
813 {
814 if (routing_key[i] == '.')
815 routing_key[i] = '/';
816 else if (routing_key[i] == '/')
817 routing_key[i] = '.';
818 }
819 }
821 if (conf->format == CAMQP_FORMAT_COMMAND)
822 {
823 status = create_putval (buffer, sizeof (buffer), ds, vl);
824 if (status != 0)
825 {
826 ERROR ("amqp plugin: create_putval failed with status %i.",
827 status);
828 return (status);
829 }
830 }
831 else if (conf->format == CAMQP_FORMAT_JSON)
832 {
833 size_t bfree = sizeof (buffer);
834 size_t bfill = 0;
836 format_json_initialize (buffer, &bfill, &bfree);
837 format_json_value_list (buffer, &bfill, &bfree, ds, vl, conf->store_rates);
838 format_json_finalize (buffer, &bfill, &bfree);
839 }
840 else if (conf->format == CAMQP_FORMAT_GRAPHITE)
841 {
842 status = format_graphite (buffer, sizeof (buffer), ds, vl,
843 conf->prefix, conf->postfix, conf->escape_char,
844 conf->graphite_flags);
845 if (status != 0)
846 {
847 ERROR ("amqp plugin: format_graphite failed with status %i.",
848 status);
849 return (status);
850 }
851 }
852 else
853 {
854 ERROR ("amqp plugin: Invalid format (%i).", conf->format);
855 return (-1);
856 }
858 pthread_mutex_lock (&conf->lock);
859 status = camqp_write_locked (conf, buffer, routing_key);
860 pthread_mutex_unlock (&conf->lock);
862 return (status);
863 } /* }}} int camqp_write */
865 /*
866 * Config handling
867 */
868 static int camqp_config_set_format (oconfig_item_t *ci, /* {{{ */
869 camqp_config_t *conf)
870 {
871 char *string;
872 int status;
874 string = NULL;
875 status = cf_util_get_string (ci, &string);
876 if (status != 0)
877 return (status);
879 assert (string != NULL);
880 if (strcasecmp ("Command", string) == 0)
881 conf->format = CAMQP_FORMAT_COMMAND;
882 else if (strcasecmp ("JSON", string) == 0)
883 conf->format = CAMQP_FORMAT_JSON;
884 else if (strcasecmp ("Graphite", string) == 0)
885 conf->format = CAMQP_FORMAT_GRAPHITE;
886 else
887 {
888 WARNING ("amqp plugin: Invalid format string: %s",
889 string);
890 }
892 free (string);
894 return (0);
895 } /* }}} int config_set_string */
897 static int camqp_config_connection (oconfig_item_t *ci, /* {{{ */
898 _Bool publish)
899 {
900 camqp_config_t *conf;
901 int status;
902 int i;
904 conf = malloc (sizeof (*conf));
905 if (conf == NULL)
906 {
907 ERROR ("amqp plugin: malloc failed.");
908 return (ENOMEM);
909 }
911 /* Initialize "conf" {{{ */
912 memset (conf, 0, sizeof (*conf));
913 conf->publish = publish;
914 conf->name = NULL;
915 conf->format = CAMQP_FORMAT_COMMAND;
916 conf->host = NULL;
917 conf->port = 5672;
918 conf->vhost = NULL;
919 conf->user = NULL;
920 conf->password = NULL;
921 conf->exchange = NULL;
922 conf->routing_key = NULL;
923 /* publish only */
924 conf->delivery_mode = CAMQP_DM_VOLATILE;
925 conf->store_rates = 0;
926 conf->graphite_flags = 0;
927 /* publish & graphite only */
928 conf->prefix = NULL;
929 conf->postfix = NULL;
930 conf->escape_char = '_';
931 /* subscribe only */
932 conf->exchange_type = NULL;
933 conf->queue = NULL;
934 /* general */
935 conf->connection = NULL;
936 pthread_mutex_init (&conf->lock, /* attr = */ NULL);
937 /* }}} */
939 status = cf_util_get_string (ci, &conf->name);
940 if (status != 0)
941 {
942 sfree (conf);
943 return (status);
944 }
946 for (i = 0; i < ci->children_num; i++)
947 {
948 oconfig_item_t *child = ci->children + i;
950 if (strcasecmp ("Host", child->key) == 0)
951 status = cf_util_get_string (child, &conf->host);
952 else if (strcasecmp ("Port", child->key) == 0)
953 {
954 status = cf_util_get_port_number (child);
955 if (status > 0)
956 {
957 conf->port = status;
958 status = 0;
959 }
960 }
961 else if (strcasecmp ("VHost", child->key) == 0)
962 status = cf_util_get_string (child, &conf->vhost);
963 else if (strcasecmp ("User", child->key) == 0)
964 status = cf_util_get_string (child, &conf->user);
965 else if (strcasecmp ("Password", child->key) == 0)
966 status = cf_util_get_string (child, &conf->password);
967 else if (strcasecmp ("Exchange", child->key) == 0)
968 status = cf_util_get_string (child, &conf->exchange);
969 else if ((strcasecmp ("ExchangeType", child->key) == 0) && !publish)
970 status = cf_util_get_string (child, &conf->exchange_type);
971 else if ((strcasecmp ("Queue", child->key) == 0) && !publish)
972 status = cf_util_get_string (child, &conf->queue);
973 else if (strcasecmp ("RoutingKey", child->key) == 0)
974 status = cf_util_get_string (child, &conf->routing_key);
975 else if ((strcasecmp ("Persistent", child->key) == 0) && publish)
976 {
977 _Bool tmp = 0;
978 status = cf_util_get_boolean (child, &tmp);
979 if (tmp)
980 conf->delivery_mode = CAMQP_DM_PERSISTENT;
981 else
982 conf->delivery_mode = CAMQP_DM_VOLATILE;
983 }
984 else if ((strcasecmp ("StoreRates", child->key) == 0) && publish)
985 {
986 status = cf_util_get_boolean (child, &conf->store_rates);
987 (void) cf_util_get_flag (child, &conf->graphite_flags,
988 GRAPHITE_STORE_RATES);
989 }
990 else if ((strcasecmp ("Format", child->key) == 0) && publish)
991 status = camqp_config_set_format (child, conf);
992 else if ((strcasecmp ("GraphiteSeparateInstances", child->key) == 0) && publish)
993 status = cf_util_get_flag (child, &conf->graphite_flags,
994 GRAPHITE_SEPARATE_INSTANCES);
995 else if ((strcasecmp ("GraphiteAlwaysAppendDS", child->key) == 0) && publish)
996 status = cf_util_get_flag (child, &conf->graphite_flags,
997 GRAPHITE_ALWAYS_APPEND_DS);
998 else if ((strcasecmp ("GraphitePrefix", child->key) == 0) && publish)
999 status = cf_util_get_string (child, &conf->prefix);
1000 else if ((strcasecmp ("GraphitePostfix", child->key) == 0) && publish)
1001 status = cf_util_get_string (child, &conf->postfix);
1002 else if ((strcasecmp ("GraphiteEscapeChar", child->key) == 0) && publish)
1003 {
1004 char *tmp_buff = NULL;
1005 status = cf_util_get_string (child, &tmp_buff);
1006 if (strlen (tmp_buff) > 1)
1007 WARNING ("amqp plugin: The option \"GraphiteEscapeChar\" handles "
1008 "only one character. Others will be ignored.");
1009 conf->escape_char = tmp_buff[0];
1010 sfree (tmp_buff);
1011 }
1012 else
1013 WARNING ("amqp plugin: Ignoring unknown "
1014 "configuration option \"%s\".", child->key);
1016 if (status != 0)
1017 break;
1018 } /* for (i = 0; i < ci->children_num; i++) */
1020 if ((status == 0) && (conf->exchange == NULL))
1021 {
1022 if (conf->exchange_type != NULL)
1023 WARNING ("amqp plugin: The option \"ExchangeType\" was given "
1024 "without the \"Exchange\" option. It will be ignored.");
1026 if (!publish && (conf->routing_key != NULL))
1027 WARNING ("amqp plugin: The option \"RoutingKey\" was given "
1028 "without the \"Exchange\" option. It will be ignored.");
1030 }
1032 if (status != 0)
1033 {
1034 camqp_config_free (conf);
1035 return (status);
1036 }
1038 if (conf->exchange != NULL)
1039 {
1040 DEBUG ("amqp plugin: camqp_config_connection: exchange = %s;",
1041 conf->exchange);
1042 }
1044 if (publish)
1045 {
1046 char cbname[128];
1047 user_data_t ud = { conf, camqp_config_free };
1049 ssnprintf (cbname, sizeof (cbname), "amqp/%s", conf->name);
1051 status = plugin_register_write (cbname, camqp_write, &ud);
1052 if (status != 0)
1053 {
1054 camqp_config_free (conf);
1055 return (status);
1056 }
1057 }
1058 else
1059 {
1060 status = camqp_subscribe_init (conf);
1061 if (status != 0)
1062 {
1063 camqp_config_free (conf);
1064 return (status);
1065 }
1066 }
1068 return (0);
1069 } /* }}} int camqp_config_connection */
1071 static int camqp_config (oconfig_item_t *ci) /* {{{ */
1072 {
1073 int i;
1075 for (i = 0; i < ci->children_num; i++)
1076 {
1077 oconfig_item_t *child = ci->children + i;
1079 if (strcasecmp ("Publish", child->key) == 0)
1080 camqp_config_connection (child, /* publish = */ 1);
1081 else if (strcasecmp ("Subscribe", child->key) == 0)
1082 camqp_config_connection (child, /* publish = */ 0);
1083 else
1084 WARNING ("amqp plugin: Ignoring unknown config option \"%s\".",
1085 child->key);
1086 } /* for (ci->children_num) */
1088 return (0);
1089 } /* }}} int camqp_config */
1091 void module_register (void)
1092 {
1093 plugin_register_complex_config ("amqp", camqp_config);
1094 plugin_register_shutdown ("amqp", camqp_shutdown);
1095 } /* void module_register */
1097 /* vim: set sw=4 sts=4 et fdm=marker : */