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_socket_close (socket)
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 CLOSE_SOCKET ();
445 amqp_destroy_connection (conf->connection);
446 conf->connection = NULL;
447 return (status);
448 }
449 #else /* HAVE_AMQP_TCP_SOCKET */
450 # define CLOSE_SOCKET() close(sockfd)
451 /* this interface is deprecated as of rabbitmq-c 0.4 */
452 sockfd = amqp_open_socket (CONF(conf, host), conf->port);
453 if (sockfd < 0)
454 {
455 char errbuf[1024];
456 status = (-1) * sockfd;
457 ERROR ("amqp plugin: amqp_open_socket failed: %s",
458 sstrerror (status, errbuf, sizeof (errbuf)));
459 amqp_destroy_connection (conf->connection);
460 conf->connection = NULL;
461 return (status);
462 }
463 amqp_set_sockfd (conf->connection, sockfd);
464 #endif
466 reply = amqp_login (conf->connection, CONF(conf, vhost),
467 /* channel max = */ 0,
468 /* frame max = */ 131072,
469 /* heartbeat = */ 0,
470 /* authentication = */ AMQP_SASL_METHOD_PLAIN,
471 CONF(conf, user), CONF(conf, password));
472 if (reply.reply_type != AMQP_RESPONSE_NORMAL)
473 {
474 ERROR ("amqp plugin: amqp_login (vhost = %s, user = %s) failed.",
475 CONF(conf, vhost), CONF(conf, user));
476 amqp_destroy_connection (conf->connection);
477 CLOSE_SOCKET ();
478 conf->connection = NULL;
479 return (1);
480 }
482 amqp_channel_open (conf->connection, /* channel = */ 1);
483 /* FIXME: Is checking "reply.reply_type" really correct here? How does
484 * it get set? --octo */
485 if (reply.reply_type != AMQP_RESPONSE_NORMAL)
486 {
487 ERROR ("amqp plugin: amqp_channel_open failed.");
488 amqp_connection_close (conf->connection, AMQP_REPLY_SUCCESS);
489 amqp_destroy_connection (conf->connection);
490 CLOSE_SOCKET ();
491 conf->connection = NULL;
492 return (1);
493 }
495 INFO ("amqp plugin: Successfully opened connection to vhost \"%s\" "
496 "on %s:%i.", CONF(conf, vhost), CONF(conf, host), conf->port);
498 status = camqp_create_exchange (conf);
499 if (status != 0)
500 return (status);
502 if (!conf->publish)
503 return (camqp_setup_queue (conf));
504 return (0);
505 } /* }}} int camqp_connect */
507 static int camqp_shutdown (void) /* {{{ */
508 {
509 size_t i;
511 DEBUG ("amqp plugin: Shutting down %zu subscriber threads.",
512 subscriber_threads_num);
514 subscriber_threads_running = 0;
515 for (i = 0; i < subscriber_threads_num; i++)
516 {
517 /* FIXME: Sending a signal is not very elegant here. Maybe find out how
518 * to use a timeout in the thread and check for the variable in regular
519 * intervals. */
520 pthread_kill (subscriber_threads[i], SIGTERM);
521 pthread_join (subscriber_threads[i], /* retval = */ NULL);
522 }
524 subscriber_threads_num = 0;
525 sfree (subscriber_threads);
527 DEBUG ("amqp plugin: All subscriber threads exited.");
529 return (0);
530 } /* }}} int camqp_shutdown */
532 /*
533 * Subscribing code
534 */
535 static int camqp_read_body (camqp_config_t *conf, /* {{{ */
536 size_t body_size, const char *content_type)
537 {
538 char body[body_size + 1];
539 char *body_ptr;
540 size_t received;
541 amqp_frame_t frame;
542 int status;
544 memset (body, 0, sizeof (body));
545 body_ptr = &body[0];
546 received = 0;
548 while (received < body_size)
549 {
550 status = amqp_simple_wait_frame (conf->connection, &frame);
551 if (status < 0)
552 {
553 char errbuf[1024];
554 status = (-1) * status;
555 ERROR ("amqp plugin: amqp_simple_wait_frame failed: %s",
556 sstrerror (status, errbuf, sizeof (errbuf)));
557 camqp_close_connection (conf);
558 return (status);
559 }
561 if (frame.frame_type != AMQP_FRAME_BODY)
562 {
563 NOTICE ("amqp plugin: Unexpected frame type: %#"PRIx8,
564 frame.frame_type);
565 return (-1);
566 }
568 if ((body_size - received) < frame.payload.body_fragment.len)
569 {
570 WARNING ("amqp plugin: Body is larger than indicated by header.");
571 return (-1);
572 }
574 memcpy (body_ptr, frame.payload.body_fragment.bytes,
575 frame.payload.body_fragment.len);
576 body_ptr += frame.payload.body_fragment.len;
577 received += frame.payload.body_fragment.len;
578 } /* while (received < body_size) */
580 if (strcasecmp ("text/collectd", content_type) == 0)
581 {
582 status = handle_putval (stderr, body);
583 if (status != 0)
584 ERROR ("amqp plugin: handle_putval failed with status %i.",
585 status);
586 return (status);
587 }
588 else if (strcasecmp ("application/json", content_type) == 0)
589 {
590 ERROR ("amqp plugin: camqp_read_body: Parsing JSON data has not "
591 "been implemented yet. FIXME!");
592 return (0);
593 }
594 else
595 {
596 ERROR ("amqp plugin: camqp_read_body: Unknown content type \"%s\".",
597 content_type);
598 return (EINVAL);
599 }
601 /* not reached */
602 return (0);
603 } /* }}} int camqp_read_body */
605 static int camqp_read_header (camqp_config_t *conf) /* {{{ */
606 {
607 int status;
608 amqp_frame_t frame;
609 amqp_basic_properties_t *properties;
610 char *content_type;
612 status = amqp_simple_wait_frame (conf->connection, &frame);
613 if (status < 0)
614 {
615 char errbuf[1024];
616 status = (-1) * status;
617 ERROR ("amqp plugin: amqp_simple_wait_frame failed: %s",
618 sstrerror (status, errbuf, sizeof (errbuf)));
619 camqp_close_connection (conf);
620 return (status);
621 }
623 if (frame.frame_type != AMQP_FRAME_HEADER)
624 {
625 NOTICE ("amqp plugin: Unexpected frame type: %#"PRIx8,
626 frame.frame_type);
627 return (-1);
628 }
630 properties = frame.payload.properties.decoded;
631 content_type = camqp_bytes_cstring (&properties->content_type);
632 if (content_type == NULL)
633 {
634 ERROR ("amqp plugin: Unable to determine content type.");
635 return (-1);
636 }
638 status = camqp_read_body (conf,
639 (size_t) frame.payload.properties.body_size,
640 content_type);
642 sfree (content_type);
643 return (status);
644 } /* }}} int camqp_read_header */
646 static void *camqp_subscribe_thread (void *user_data) /* {{{ */
647 {
648 camqp_config_t *conf = user_data;
649 int status;
651 cdtime_t interval = plugin_get_interval ();
653 while (subscriber_threads_running)
654 {
655 amqp_frame_t frame;
657 status = camqp_connect (conf);
658 if (status != 0)
659 {
660 struct timespec ts_interval;
661 ERROR ("amqp plugin: camqp_connect failed. "
662 "Will sleep for %.3f seconds.",
663 CDTIME_T_TO_DOUBLE (interval));
664 CDTIME_T_TO_TIMESPEC (interval, &ts_interval);
665 nanosleep (&ts_interval, /* remaining = */ NULL);
666 continue;
667 }
669 status = amqp_simple_wait_frame (conf->connection, &frame);
670 if (status < 0)
671 {
672 struct timespec ts_interval;
673 ERROR ("amqp plugin: amqp_simple_wait_frame failed. "
674 "Will sleep for %.3f seconds.",
675 CDTIME_T_TO_DOUBLE (interval));
676 camqp_close_connection (conf);
677 CDTIME_T_TO_TIMESPEC (interval, &ts_interval);
678 nanosleep (&ts_interval, /* remaining = */ NULL);
679 continue;
680 }
682 if (frame.frame_type != AMQP_FRAME_METHOD)
683 {
684 DEBUG ("amqp plugin: Unexpected frame type: %#"PRIx8,
685 frame.frame_type);
686 continue;
687 }
689 if (frame.payload.method.id != AMQP_BASIC_DELIVER_METHOD)
690 {
691 DEBUG ("amqp plugin: Unexpected method id: %#"PRIx32,
692 frame.payload.method.id);
693 continue;
694 }
696 status = camqp_read_header (conf);
698 amqp_maybe_release_buffers (conf->connection);
699 } /* while (subscriber_threads_running) */
701 camqp_config_free (conf);
702 pthread_exit (NULL);
703 return (NULL);
704 } /* }}} void *camqp_subscribe_thread */
706 static int camqp_subscribe_init (camqp_config_t *conf) /* {{{ */
707 {
708 int status;
709 pthread_t *tmp;
711 tmp = realloc (subscriber_threads,
712 sizeof (*subscriber_threads) * (subscriber_threads_num + 1));
713 if (tmp == NULL)
714 {
715 ERROR ("amqp plugin: realloc failed.");
716 camqp_config_free (conf);
717 return (ENOMEM);
718 }
719 subscriber_threads = tmp;
720 tmp = subscriber_threads + subscriber_threads_num;
721 memset (tmp, 0, sizeof (*tmp));
723 status = plugin_thread_create (tmp, /* attr = */ NULL,
724 camqp_subscribe_thread, conf);
725 if (status != 0)
726 {
727 char errbuf[1024];
728 ERROR ("amqp plugin: pthread_create failed: %s",
729 sstrerror (status, errbuf, sizeof (errbuf)));
730 camqp_config_free (conf);
731 return (status);
732 }
734 subscriber_threads_num++;
736 return (0);
737 } /* }}} int camqp_subscribe_init */
739 /*
740 * Publishing code
741 */
742 /* XXX: You must hold "conf->lock" when calling this function! */
743 static int camqp_write_locked (camqp_config_t *conf, /* {{{ */
744 const char *buffer, const char *routing_key)
745 {
746 amqp_basic_properties_t props;
747 int status;
749 status = camqp_connect (conf);
750 if (status != 0)
751 return (status);
753 memset (&props, 0, sizeof (props));
754 props._flags = AMQP_BASIC_CONTENT_TYPE_FLAG
755 | AMQP_BASIC_DELIVERY_MODE_FLAG
756 | AMQP_BASIC_APP_ID_FLAG;
757 if (conf->format == CAMQP_FORMAT_COMMAND)
758 props.content_type = amqp_cstring_bytes("text/collectd");
759 else if (conf->format == CAMQP_FORMAT_JSON)
760 props.content_type = amqp_cstring_bytes("application/json");
761 else if (conf->format == CAMQP_FORMAT_GRAPHITE)
762 props.content_type = amqp_cstring_bytes("text/graphite");
763 else
764 assert (23 == 42);
765 props.delivery_mode = conf->delivery_mode;
766 props.app_id = amqp_cstring_bytes("collectd");
768 status = amqp_basic_publish(conf->connection,
769 /* channel = */ 1,
770 amqp_cstring_bytes(CONF(conf, exchange)),
771 amqp_cstring_bytes (routing_key),
772 /* mandatory = */ 0,
773 /* immediate = */ 0,
774 &props,
775 amqp_cstring_bytes(buffer));
776 if (status != 0)
777 {
778 ERROR ("amqp plugin: amqp_basic_publish failed with status %i.",
779 status);
780 camqp_close_connection (conf);
781 }
783 return (status);
784 } /* }}} int camqp_write_locked */
786 static int camqp_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
787 user_data_t *user_data)
788 {
789 camqp_config_t *conf = user_data->data;
790 char routing_key[6 * DATA_MAX_NAME_LEN];
791 char buffer[4096];
792 int status;
794 if ((ds == NULL) || (vl == NULL) || (conf == NULL))
795 return (EINVAL);
797 memset (buffer, 0, sizeof (buffer));
799 if (conf->routing_key != NULL)
800 {
801 sstrncpy (routing_key, conf->routing_key, sizeof (routing_key));
802 }
803 else
804 {
805 size_t i;
806 ssnprintf (routing_key, sizeof (routing_key), "collectd/%s/%s/%s/%s/%s",
807 vl->host,
808 vl->plugin, vl->plugin_instance,
809 vl->type, vl->type_instance);
811 /* Switch slashes (the only character forbidden by collectd) and dots
812 * (the separation character used by AMQP). */
813 for (i = 0; routing_key[i] != 0; i++)
814 {
815 if (routing_key[i] == '.')
816 routing_key[i] = '/';
817 else if (routing_key[i] == '/')
818 routing_key[i] = '.';
819 }
820 }
822 if (conf->format == CAMQP_FORMAT_COMMAND)
823 {
824 status = create_putval (buffer, sizeof (buffer), ds, vl);
825 if (status != 0)
826 {
827 ERROR ("amqp plugin: create_putval failed with status %i.",
828 status);
829 return (status);
830 }
831 }
832 else if (conf->format == CAMQP_FORMAT_JSON)
833 {
834 size_t bfree = sizeof (buffer);
835 size_t bfill = 0;
837 format_json_initialize (buffer, &bfill, &bfree);
838 format_json_value_list (buffer, &bfill, &bfree, ds, vl, conf->store_rates);
839 format_json_finalize (buffer, &bfill, &bfree);
840 }
841 else if (conf->format == CAMQP_FORMAT_GRAPHITE)
842 {
843 status = format_graphite (buffer, sizeof (buffer), ds, vl,
844 conf->prefix, conf->postfix, conf->escape_char,
845 conf->graphite_flags);
846 if (status != 0)
847 {
848 ERROR ("amqp plugin: format_graphite failed with status %i.",
849 status);
850 return (status);
851 }
852 }
853 else
854 {
855 ERROR ("amqp plugin: Invalid format (%i).", conf->format);
856 return (-1);
857 }
859 pthread_mutex_lock (&conf->lock);
860 status = camqp_write_locked (conf, buffer, routing_key);
861 pthread_mutex_unlock (&conf->lock);
863 return (status);
864 } /* }}} int camqp_write */
866 /*
867 * Config handling
868 */
869 static int camqp_config_set_format (oconfig_item_t *ci, /* {{{ */
870 camqp_config_t *conf)
871 {
872 char *string;
873 int status;
875 string = NULL;
876 status = cf_util_get_string (ci, &string);
877 if (status != 0)
878 return (status);
880 assert (string != NULL);
881 if (strcasecmp ("Command", string) == 0)
882 conf->format = CAMQP_FORMAT_COMMAND;
883 else if (strcasecmp ("JSON", string) == 0)
884 conf->format = CAMQP_FORMAT_JSON;
885 else if (strcasecmp ("Graphite", string) == 0)
886 conf->format = CAMQP_FORMAT_GRAPHITE;
887 else
888 {
889 WARNING ("amqp plugin: Invalid format string: %s",
890 string);
891 }
893 free (string);
895 return (0);
896 } /* }}} int config_set_string */
898 static int camqp_config_connection (oconfig_item_t *ci, /* {{{ */
899 _Bool publish)
900 {
901 camqp_config_t *conf;
902 int status;
903 int i;
905 conf = malloc (sizeof (*conf));
906 if (conf == NULL)
907 {
908 ERROR ("amqp plugin: malloc failed.");
909 return (ENOMEM);
910 }
912 /* Initialize "conf" {{{ */
913 memset (conf, 0, sizeof (*conf));
914 conf->publish = publish;
915 conf->name = NULL;
916 conf->format = CAMQP_FORMAT_COMMAND;
917 conf->host = NULL;
918 conf->port = 5672;
919 conf->vhost = NULL;
920 conf->user = NULL;
921 conf->password = NULL;
922 conf->exchange = NULL;
923 conf->routing_key = NULL;
924 /* publish only */
925 conf->delivery_mode = CAMQP_DM_VOLATILE;
926 conf->store_rates = 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 ("GraphitePrefix", child->key) == 0) && publish)
993 status = cf_util_get_string (child, &conf->prefix);
994 else if ((strcasecmp ("GraphitePostfix", child->key) == 0) && publish)
995 status = cf_util_get_string (child, &conf->postfix);
996 else if ((strcasecmp ("GraphiteEscapeChar", child->key) == 0) && publish)
997 {
998 char *tmp_buff = NULL;
999 status = cf_util_get_string (child, &tmp_buff);
1000 if (strlen (tmp_buff) > 1)
1001 WARNING ("amqp plugin: The option \"GraphiteEscapeChar\" handles "
1002 "only one character. Others will be ignored.");
1003 conf->escape_char = tmp_buff[0];
1004 sfree (tmp_buff);
1005 }
1006 else
1007 WARNING ("amqp plugin: Ignoring unknown "
1008 "configuration option \"%s\".", child->key);
1010 if (status != 0)
1011 break;
1012 } /* for (i = 0; i < ci->children_num; i++) */
1014 if ((status == 0) && (conf->exchange == NULL))
1015 {
1016 if (conf->exchange_type != NULL)
1017 WARNING ("amqp plugin: The option \"ExchangeType\" was given "
1018 "without the \"Exchange\" option. It will be ignored.");
1020 if (!publish && (conf->routing_key != NULL))
1021 WARNING ("amqp plugin: The option \"RoutingKey\" was given "
1022 "without the \"Exchange\" option. It will be ignored.");
1024 }
1026 if (status != 0)
1027 {
1028 camqp_config_free (conf);
1029 return (status);
1030 }
1032 if (conf->exchange != NULL)
1033 {
1034 DEBUG ("amqp plugin: camqp_config_connection: exchange = %s;",
1035 conf->exchange);
1036 }
1038 if (publish)
1039 {
1040 char cbname[128];
1041 user_data_t ud = { conf, camqp_config_free };
1043 ssnprintf (cbname, sizeof (cbname), "amqp/%s", conf->name);
1045 status = plugin_register_write (cbname, camqp_write, &ud);
1046 if (status != 0)
1047 {
1048 camqp_config_free (conf);
1049 return (status);
1050 }
1051 }
1052 else
1053 {
1054 status = camqp_subscribe_init (conf);
1055 if (status != 0)
1056 {
1057 camqp_config_free (conf);
1058 return (status);
1059 }
1060 }
1062 return (0);
1063 } /* }}} int camqp_config_connection */
1065 static int camqp_config (oconfig_item_t *ci) /* {{{ */
1066 {
1067 int i;
1069 for (i = 0; i < ci->children_num; i++)
1070 {
1071 oconfig_item_t *child = ci->children + i;
1073 if (strcasecmp ("Publish", child->key) == 0)
1074 camqp_config_connection (child, /* publish = */ 1);
1075 else if (strcasecmp ("Subscribe", child->key) == 0)
1076 camqp_config_connection (child, /* publish = */ 0);
1077 else
1078 WARNING ("amqp plugin: Ignoring unknown config option \"%s\".",
1079 child->key);
1080 } /* for (ci->children_num) */
1082 return (0);
1083 } /* }}} int camqp_config */
1085 void module_register (void)
1086 {
1087 plugin_register_complex_config ("amqp", camqp_config);
1088 plugin_register_shutdown ("amqp", camqp_shutdown);
1089 } /* void module_register */
1091 /* vim: set sw=4 sts=4 et fdm=marker : */