Code

write_riemann plugin: Implement the "TTLFactor" option.
[collectd.git] / src / write_riemann.c
1 /**
2  * collectd - src/write_riemann.c
3  *
4  * Copyright (C) 2012,2013  Pierre-Yves Ritschard
5  * Copyright (C) 2013       Florian octo Forster
6  *
7  * Permission to use, copy, modify, and distribute this software for any
8  * purpose with or without fee is hereby granted, provided that the above
9  * copyright notice and this permission notice appear in all copies.
10  *
11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
16  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
17  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18  *
19  * Authors:
20  *   Pierre-Yves Ritschard <pyr at spootnik.org>
21  *   Florian octo Forster <octo at collectd.org>
22  */
24 #include "collectd.h"
25 #include "plugin.h"
26 #include "common.h"
27 #include "configfile.h"
28 #include "utils_cache.h"
29 #include "riemann.pb-c.h"
31 #include <sys/socket.h>
32 #include <arpa/inet.h>
33 #include <errno.h>
34 #include <netdb.h>
35 #include <inttypes.h>
36 #include <pthread.h>
38 #define RIEMANN_HOST            "localhost"
39 #define RIEMANN_PORT            "5555"
40 #define RIEMANN_TTL_FACTOR      2.0
42 struct riemann_host {
43         char                    *name;
44 #define F_CONNECT                0x01
45         uint8_t                  flags;
46         pthread_mutex_t          lock;
47         _Bool                    store_rates;
48         _Bool                    always_append_ds;
49         char                    *node;
50         char                    *service;
51         _Bool                    use_tcp;
52         int                      s;
53         double                   ttl_factor;
55         int                      reference_count;
56 };
58 static char     **riemann_tags;
59 static size_t     riemann_tags_num;
61 static void riemann_event_protobuf_free (Event *event) /* {{{ */
62 {
63         if (event == NULL)
64                 return;
66         sfree (event->state);
67         sfree (event->service);
68         sfree (event->host);
69         sfree (event->description);
71         strarray_free (event->tags, event->n_tags);
72         event->tags = NULL;
73         event->n_tags = 0;
75         sfree (event);
76 } /* }}} void riemann_event_protobuf_free */
78 static void riemann_msg_protobuf_free (Msg *msg) /* {{{ */
79 {
80         size_t i;
82         if (msg == NULL)
83                 return;
85         for (i = 0; i < msg->n_events; i++)
86         {
87                 riemann_event_protobuf_free (msg->events[i]);
88                 msg->events[i] = NULL;
89         }
91         sfree (msg->events);
92         msg->n_events = 0;
94         sfree (msg);
95 } /* }}} void riemann_msg_protobuf_free */
97 /* host->lock must be held when calling this function. */
98 static int
99 riemann_connect(struct riemann_host *host)
101         int                      e;
102         struct addrinfo         *ai, *res, hints;
103         char const              *node;
104         char const              *service;
106         if (host->flags & F_CONNECT)
107                 return 0;
109         memset(&hints, 0, sizeof(hints));
110         memset(&service, 0, sizeof(service));
111         hints.ai_family = AF_UNSPEC;
112         hints.ai_socktype = host->use_tcp ? SOCK_STREAM : SOCK_DGRAM;
113 #ifdef AI_ADDRCONFIG
114         hints.ai_flags |= AI_ADDRCONFIG;
115 #endif
117         node = (host->node != NULL) ? host->node : RIEMANN_HOST;
118         service = (host->service != NULL) ? host->service : RIEMANN_PORT;
120         if ((e = getaddrinfo(node, service, &hints, &res)) != 0) {
121                 ERROR ("write_riemann plugin: Unable to resolve host \"%s\": %s",
122                         node, gai_strerror(e));
123                 return -1;
124         }
126         host->s = -1;
127         for (ai = res; ai != NULL; ai = ai->ai_next) {
128                 if ((host->s = socket(ai->ai_family,
129                                       ai->ai_socktype,
130                                       ai->ai_protocol)) == -1) {
131                         continue;
132                 }
134                 if (connect(host->s, ai->ai_addr, ai->ai_addrlen) != 0) {
135                         close(host->s);
136                         host->s = -1;
137                         continue;
138                 }
140                 host->flags |= F_CONNECT;
141                 DEBUG("write_riemann plugin: got a succesful connection for: %s:%s",
142                                 node, service);
143                 break;
144         }
146         freeaddrinfo(res);
148         if (host->s < 0) {
149                 WARNING("write_riemann plugin: Unable to connect to Riemann at %s:%s",
150                                 node, service);
151                 return -1;
152         }
153         return 0;
156 /* host->lock must be held when calling this function. */
157 static int
158 riemann_disconnect (struct riemann_host *host)
160         if ((host->flags & F_CONNECT) == 0)
161                 return (0);
163         close (host->s);
164         host->s = -1;
165         host->flags &= ~F_CONNECT;
167         return (0);
170 static int
171 riemann_send(struct riemann_host *host, Msg const *msg)
173         u_char *buffer;
174         size_t  buffer_len;
175         int status;
177         pthread_mutex_lock (&host->lock);
179         status = riemann_connect (host);
180         if (status != 0)
181         {
182                 pthread_mutex_unlock (&host->lock);
183                 return status;
184         }
186         buffer_len = msg__get_packed_size(msg);
187         if (host->use_tcp)
188                 buffer_len += 4;
190         buffer = malloc (buffer_len);
191         if (buffer == NULL) {
192                 pthread_mutex_unlock (&host->lock);
193                 ERROR ("write_riemann plugin: malloc failed.");
194                 return ENOMEM;
195         }
196         memset (buffer, 0, buffer_len);
198         if (host->use_tcp)
199         {
200                 uint32_t length = htonl ((uint32_t) (buffer_len - 4));
201                 memcpy (buffer, &length, 4);
202                 msg__pack(msg, buffer + 4);
203         }
204         else
205         {
206                 msg__pack(msg, buffer);
207         }
209         status = (int) swrite (host->s, buffer, buffer_len);
210         if (status != 0)
211         {
212                 char errbuf[1024];
214                 riemann_disconnect (host);
215                 pthread_mutex_unlock (&host->lock);
217                 ERROR ("write_riemann plugin: Sending to Riemann at %s:%s failed: %s",
218                                 (host->node != NULL) ? host->node : RIEMANN_HOST,
219                                 (host->service != NULL) ? host->service : RIEMANN_PORT,
220                                 sstrerror (errno, errbuf, sizeof (errbuf)));
221                 sfree (buffer);
222                 return -1;
223         }
225         pthread_mutex_unlock (&host->lock);
226         sfree (buffer);
227         return 0;
230 static int riemann_event_add_tag (Event *event, char const *tag) /* {{{ */
232         return (strarray_add (&event->tags, &event->n_tags, tag));
233 } /* }}} int riemann_event_add_tag */
235 static int riemann_event_add_attribute (Event *event, /* {{{ */
236                 char const *key, char const *value)
238         Attribute **new_attributes;
239         Attribute *a;
241         new_attributes = realloc (event->attributes,
242                         sizeof (*event->attributes) * (event->n_attributes + 1));
243         if (new_attributes == NULL)
244         {
245                 ERROR ("write_riemann plugin: realloc failed.");
246                 return (ENOMEM);
247         }
248         event->attributes = new_attributes;
250         a = malloc (sizeof (*a));
251         if (a == NULL)
252         {
253                 ERROR ("write_riemann plugin: malloc failed.");
254                 return (ENOMEM);
255         }
256         attribute__init (a);
258         a->key = strdup (key);
259         if (value != NULL)
260                 a->value = strdup (value);
262         event->attributes[event->n_attributes] = a;
263         event->n_attributes++;
265         return (0);
266 } /* }}} int riemann_event_add_attribute */
268 static Msg *riemann_notification_to_protobuf (struct riemann_host *host, /* {{{ */
269                 notification_t const *n)
271         Msg *msg;
272         Event *event;
273         char service_buffer[6 * DATA_MAX_NAME_LEN];
274         char const *severity;
275         notification_meta_t *meta;
276         int i;
278         msg = malloc (sizeof (*msg));
279         if (msg == NULL)
280         {
281                 ERROR ("write_riemann plugin: malloc failed.");
282                 return (NULL);
283         }
284         memset (msg, 0, sizeof (*msg));
285         msg__init (msg);
287         msg->events = malloc (sizeof (*msg->events));
288         if (msg->events == NULL)
289         {
290                 ERROR ("write_riemann plugin: malloc failed.");
291                 sfree (msg);
292                 return (NULL);
293         }
295         event = malloc (sizeof (*event));
296         if (event == NULL)
297         {
298                 ERROR ("write_riemann plugin: malloc failed.");
299                 sfree (msg->events);
300                 sfree (msg);
301                 return (NULL);
302         }
303         memset (event, 0, sizeof (*event));
304         event__init (event);
306         msg->events[0] = event;
307         msg->n_events = 1;
309         event->host = strdup (n->host);
310         event->time = CDTIME_T_TO_TIME_T (n->time);
311         event->has_time = 1;
313         switch (n->severity)
314         {
315                 case NOTIF_OKAY:        severity = "ok"; break;
316                 case NOTIF_WARNING:     severity = "warning"; break;
317                 case NOTIF_FAILURE:     severity = "critical"; break;
318                 default:                severity = "unknown";
319         }
320         event->state = strdup (severity);
322         riemann_event_add_tag (event, "notification");
323         if (n->host[0] != 0)
324                 riemann_event_add_attribute (event, "host", n->host);
325         if (n->plugin[0] != 0)
326                 riemann_event_add_attribute (event, "plugin", n->plugin);
327         if (n->plugin_instance[0] != 0)
328                 riemann_event_add_attribute (event, "plugin_instance",
329                                 n->plugin_instance);
331         if (n->type[0] != 0)
332                 riemann_event_add_attribute (event, "type", n->type);
333         if (n->type_instance[0] != 0)
334                 riemann_event_add_attribute (event, "type_instance",
335                                 n->type_instance);
337         for (i = 0; i < riemann_tags_num; i++)
338                 riemann_event_add_tag (event, riemann_tags[i]);
340         format_name (service_buffer, sizeof (service_buffer),
341                         /* host = */ "", n->plugin, n->plugin_instance,
342                         n->type, n->type_instance);
343         event->service = strdup (&service_buffer[1]);
345         /* Pull in values from threshold */
346         for (meta = n->meta; meta != NULL; meta = meta->next)
347         {
348                 if (strcasecmp ("CurrentValue", meta->name) != 0)
349                         continue;
351                 event->metric_d = meta->nm_value.nm_double;
352                 event->has_metric_d = 1;
353                 break;
354         }
356         DEBUG ("write_riemann plugin: Successfully created protobuf for notification: "
357                         "host = \"%s\", service = \"%s\", state = \"%s\"",
358                         event->host, event->service, event->state);
359         return (msg);
360 } /* }}} Msg *riemann_notification_to_protobuf */
362 static Event *riemann_value_to_protobuf (struct riemann_host const *host, /* {{{ */
363                 data_set_t const *ds,
364                 value_list_t const *vl, size_t index,
365                 gauge_t const *rates)
367         Event *event;
368         char name_buffer[5 * DATA_MAX_NAME_LEN];
369         char service_buffer[6 * DATA_MAX_NAME_LEN];
370         double ttl;
371         int i;
373         event = malloc (sizeof (*event));
374         if (event == NULL)
375         {
376                 ERROR ("write_riemann plugin: malloc failed.");
377                 return (NULL);
378         }
379         memset (event, 0, sizeof (*event));
380         event__init (event);
382         event->host = strdup (vl->host);
383         event->time = CDTIME_T_TO_TIME_T (vl->time);
384         event->has_time = 1;
386         ttl = CDTIME_T_TO_DOUBLE (vl->interval) * host->ttl_factor;
387         event->ttl = (float) ttl;
388         event->has_ttl = 1;
390         riemann_event_add_attribute (event, "plugin", vl->plugin);
391         if (vl->plugin_instance[0] != 0)
392                 riemann_event_add_attribute (event, "plugin_instance",
393                                 vl->plugin_instance);
395         riemann_event_add_attribute (event, "type", vl->type);
396         if (vl->type_instance[0] != 0)
397                 riemann_event_add_attribute (event, "type_instance",
398                                 vl->type_instance);
400         if ((ds->ds[index].type != DS_TYPE_GAUGE) && (rates != NULL))
401         {
402                 char ds_type[DATA_MAX_NAME_LEN];
404                 ssnprintf (ds_type, sizeof (ds_type), "%s:rate",
405                                 DS_TYPE_TO_STRING(ds->ds[index].type));
406                 riemann_event_add_attribute (event, "ds_type", ds_type);
407         }
408         else
409         {
410                 riemann_event_add_attribute (event, "ds_type",
411                                 DS_TYPE_TO_STRING(ds->ds[index].type));
412         }
413         riemann_event_add_attribute (event, "ds_name", ds->ds[index].name);
414         {
415                 char ds_index[DATA_MAX_NAME_LEN];
417                 ssnprintf (ds_index, sizeof (ds_index), "%zu", index);
418                 riemann_event_add_attribute (event, "ds_index", ds_index);
419         }
421         for (i = 0; i < riemann_tags_num; i++)
422                 riemann_event_add_tag (event, riemann_tags[i]);
424         if (ds->ds[index].type == DS_TYPE_GAUGE)
425         {
426                 event->has_metric_d = 1;
427                 event->metric_d = (double) vl->values[index].gauge;
428         }
429         else if (rates != NULL)
430         {
431                 event->has_metric_d = 1;
432                 event->metric_d = (double) rates[index];
433         }
434         else
435         {
436                 event->has_metric_sint64 = 1;
437                 if (ds->ds[index].type == DS_TYPE_DERIVE)
438                         event->metric_sint64 = (int64_t) vl->values[index].derive;
439                 else if (ds->ds[index].type == DS_TYPE_ABSOLUTE)
440                         event->metric_sint64 = (int64_t) vl->values[index].absolute;
441                 else
442                         event->metric_sint64 = (int64_t) vl->values[index].counter;
443         }
445         format_name (name_buffer, sizeof (name_buffer),
446                         /* host = */ "", vl->plugin, vl->plugin_instance,
447                         vl->type, vl->type_instance);
448         if (host->always_append_ds || (ds->ds_num > 1))
449                 ssnprintf (service_buffer, sizeof (service_buffer),
450                                 "%s/%s", &name_buffer[1], ds->ds[index].name);
451         else
452                 sstrncpy (service_buffer, &name_buffer[1],
453                                 sizeof (service_buffer));
455         event->service = strdup (service_buffer);
457         DEBUG ("write_riemann plugin: Successfully created protobuf for metric: "
458                         "host = \"%s\", service = \"%s\"",
459                         event->host, event->service);
460         return (event);
461 } /* }}} Event *riemann_value_to_protobuf */
463 static Msg *riemann_value_list_to_protobuf (struct riemann_host const *host, /* {{{ */
464                 data_set_t const *ds,
465                 value_list_t const *vl)
467         Msg *msg;
468         size_t i;
469         gauge_t *rates = NULL;
471         /* Initialize the Msg structure. */
472         msg = malloc (sizeof (*msg));
473         if (msg == NULL)
474         {
475                 ERROR ("write_riemann plugin: malloc failed.");
476                 return (NULL);
477         }
478         memset (msg, 0, sizeof (*msg));
479         msg__init (msg);
481         /* Set up events. First, the list of pointers. */
482         msg->n_events = (size_t) vl->values_len;
483         msg->events = calloc (msg->n_events, sizeof (*msg->events));
484         if (msg->events == NULL)
485         {
486                 ERROR ("write_riemann plugin: calloc failed.");
487                 riemann_msg_protobuf_free (msg);
488                 return (NULL);
489         }
491         if (host->store_rates)
492         {
493                 rates = uc_get_rate (ds, vl);
494                 if (rates == NULL)
495                 {
496                         ERROR ("write_riemann plugin: uc_get_rate failed.");
497                         riemann_msg_protobuf_free (msg);
498                         return (NULL);
499                 }
500         }
502         for (i = 0; i < msg->n_events; i++)
503         {
504                 msg->events[i] = riemann_value_to_protobuf (host, ds, vl,
505                                 (int) i, rates);
506                 if (msg->events[i] == NULL)
507                 {
508                         riemann_msg_protobuf_free (msg);
509                         sfree (rates);
510                         return (NULL);
511                 }
512         }
514         sfree (rates);
515         return (msg);
516 } /* }}} Msg *riemann_value_list_to_protobuf */
518 static int
519 riemann_notification(const notification_t *n, user_data_t *ud)
521         int                      status;
522         struct riemann_host     *host = ud->data;
523         Msg                     *msg;
525         msg = riemann_notification_to_protobuf (host, n);
526         if (msg == NULL)
527                 return (-1);
529         status = riemann_send (host, msg);
530         if (status != 0)
531                 ERROR ("write_riemann plugin: riemann_send failed with status %i",
532                                 status);
534         riemann_msg_protobuf_free (msg);
535         return (status);
536 } /* }}} int riemann_notification */
538 static int
539 riemann_write(const data_set_t *ds,
540               const value_list_t *vl,
541               user_data_t *ud)
543         int                      status;
544         struct riemann_host     *host = ud->data;
545         Msg                     *msg;
547         msg = riemann_value_list_to_protobuf (host, ds, vl);
548         if (msg == NULL)
549                 return (-1);
551         status = riemann_send (host, msg);
552         if (status != 0)
553                 ERROR ("write_riemann plugin: riemann_send failed with status %i",
554                                 status);
556         riemann_msg_protobuf_free (msg);
557         return status;
560 static void
561 riemann_free(void *p)
563         struct riemann_host     *host = p;
565         if (host == NULL)
566                 return;
568         pthread_mutex_lock (&host->lock);
570         host->reference_count--;
571         if (host->reference_count > 0)
572         {
573                 pthread_mutex_unlock (&host->lock);
574                 return;
575         }
577         riemann_disconnect (host);
579         sfree(host->service);
580         pthread_mutex_destroy (&host->lock);
581         sfree(host);
584 static int
585 riemann_config_node(oconfig_item_t *ci)
587         struct riemann_host     *host = NULL;
588         int                      status = 0;
589         int                      i;
590         oconfig_item_t          *child;
591         char                     callback_name[DATA_MAX_NAME_LEN];
592         user_data_t              ud;
594         if ((host = calloc(1, sizeof (*host))) == NULL) {
595                 ERROR ("write_riemann plugin: calloc failed.");
596                 return ENOMEM;
597         }
598         pthread_mutex_init (&host->lock, NULL);
599         host->reference_count = 1;
600         host->node = NULL;
601         host->service = NULL;
602         host->store_rates = 1;
603         host->always_append_ds = 0;
604         host->use_tcp = 0;
605         host->ttl_factor = RIEMANN_TTL_FACTOR;
607         status = cf_util_get_string (ci, &host->name);
608         if (status != 0) {
609                 WARNING("write_riemann plugin: Required host name is missing.");
610                 riemann_free (host);
611                 return -1;
612         }
614         for (i = 0; i < ci->children_num; i++) {
615                 /*
616                  * The code here could be simplified but makes room
617                  * for easy adding of new options later on.
618                  */
619                 child = &ci->children[i];
620                 status = 0;
622                 if (strcasecmp ("Host", child->key) == 0) {
623                         status = cf_util_get_string (child, &host->node);
624                         if (status != 0)
625                                 break;
626                 } else if (strcasecmp ("Port", child->key) == 0) {
627                         status = cf_util_get_service (child, &host->service);
628                         if (status != 0) {
629                                 ERROR ("write_riemann plugin: Invalid argument "
630                                                 "configured for the \"Port\" "
631                                                 "option.");
632                                 break;
633                         }
634                 } else if (strcasecmp ("Protocol", child->key) == 0) {
635                         char tmp[16];
636                         status = cf_util_get_string_buffer (child,
637                                         tmp, sizeof (tmp));
638                         if (status != 0)
639                         {
640                                 ERROR ("write_riemann plugin: cf_util_get_"
641                                                 "string_buffer failed with "
642                                                 "status %i.", status);
643                                 break;
644                         }
646                         if (strcasecmp ("UDP", tmp) == 0)
647                                 host->use_tcp = 0;
648                         else if (strcasecmp ("TCP", tmp) == 0)
649                                 host->use_tcp = 1;
650                         else
651                                 WARNING ("write_riemann plugin: The value "
652                                                 "\"%s\" is not valid for the "
653                                                 "\"Protocol\" option. Use "
654                                                 "either \"UDP\" or \"TCP\".",
655                                                 tmp);
656                 } else if (strcasecmp ("StoreRates", child->key) == 0) {
657                         status = cf_util_get_boolean (child, &host->store_rates);
658                         if (status != 0)
659                                 break;
660                 } else if (strcasecmp ("AlwaysAppendDS", child->key) == 0) {
661                         status = cf_util_get_boolean (child,
662                                         &host->always_append_ds);
663                         if (status != 0)
664                                 break;
665                 } else if (strcasecmp ("TTLFactor", child->key) == 0) {
666                         double tmp = NAN;
667                         status = cf_util_get_double (child, &tmp);
668                         if (status != 0)
669                                 break;
670                         if (tmp >= 2.0) {
671                                 host->ttl_factor = tmp;
672                         } else if (tmp >= 1.0) {
673                                 NOTICE ("write_riemann plugin: The configured "
674                                                 "TTLFactor is very small "
675                                                 "(%.1f). A value of 2.0 or "
676                                                 "greater is recommended.",
677                                                 tmp);
678                                 host->ttl_factor = tmp;
679                         } else if (tmp > 0.0) {
680                                 WARNING ("write_riemann plugin: The configured "
681                                                 "TTLFactor is too small to be "
682                                                 "useful (%.1f). I'll use it "
683                                                 "since the user knows best, "
684                                                 "but under protest.",
685                                                 tmp);
686                                 host->ttl_factor = tmp;
687                         } else { /* zero, negative and NAN */
688                                 ERROR ("write_riemann plugin: The configured "
689                                                 "TTLFactor is invalid (%.1f).",
690                                                 tmp);
691                         }
692                 } else {
693                         WARNING("write_riemann plugin: ignoring unknown config "
694                                 "option: \"%s\"", child->key);
695                 }
696         }
697         if (status != 0) {
698                 riemann_free (host);
699                 return status;
700         }
702         ssnprintf (callback_name, sizeof (callback_name), "write_riemann/%s",
703                         host->name);
704         ud.data = host;
705         ud.free_func = riemann_free;
707         pthread_mutex_lock (&host->lock);
709         status = plugin_register_write (callback_name, riemann_write, &ud);
710         if (status != 0)
711                 WARNING ("write_riemann plugin: plugin_register_write (\"%s\") "
712                                 "failed with status %i.",
713                                 callback_name, status);
714         else /* success */
715                 host->reference_count++;
717         status = plugin_register_notification (callback_name,
718                         riemann_notification, &ud);
719         if (status != 0)
720                 WARNING ("write_riemann plugin: plugin_register_notification (\"%s\") "
721                                 "failed with status %i.",
722                                 callback_name, status);
723         else /* success */
724                 host->reference_count++;
726         if (host->reference_count <= 1)
727         {
728                 /* Both callbacks failed => free memory.
729                  * We need to unlock here, because riemann_free() will lock.
730                  * This is not a race condition, because we're the only one
731                  * holding a reference. */
732                 pthread_mutex_unlock (&host->lock);
733                 riemann_free (host);
734                 return (-1);
735         }
737         host->reference_count--;
738         pthread_mutex_unlock (&host->lock);
740         return status;
743 static int
744 riemann_config(oconfig_item_t *ci)
746         int              i;
747         oconfig_item_t  *child;
748         int              status;
750         for (i = 0; i < ci->children_num; i++)  {
751                 child = &ci->children[i];
753                 if (strcasecmp("Node", child->key) == 0) {
754                         riemann_config_node (child);
755                 } else if (strcasecmp(child->key, "tag") == 0) {
756                         char *tmp = NULL;
757                         status = cf_util_get_string(child, &tmp);
758                         if (status != 0)
759                                 continue;
761                         strarray_add (&riemann_tags, &riemann_tags_num, tmp);
762                         DEBUG("write_riemann plugin: Got tag: %s", tmp);
763                         sfree (tmp);
764                 } else {
765                         WARNING ("write_riemann plugin: Ignoring unknown "
766                                  "configuration option \"%s\" at top level.",
767                                  child->key);
768                 }
769         }
770         return (0);
773 void
774 module_register(void)
776         plugin_register_complex_config ("write_riemann", riemann_config);
779 /* vim: set sw=8 sts=8 ts=8 noet : */