Merge pull request #1220 from rubenk/set-package-bugreport-and-homepage
[collectd.git] / src / write_http.c
1 /**
2  * collectd - src/write_http.c
3  * Copyright (C) 2009       Paul Sadauskas
4  * Copyright (C) 2009       Doug MacEachern
5  * Copyright (C) 2007-2014  Florian octo Forster
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the
9  * Free Software Foundation; only version 2 of the License is applicable.
10  *
11  * This program is distributed in the hope that it will be useful, but
12  * WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License along
17  * with this program; if not, write to the Free Software Foundation, Inc.,
18  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
19  *
20  * Authors:
21  *   Florian octo Forster <octo at collectd.org>
22  *   Doug MacEachern <dougm@hyperic.com>
23  *   Paul Sadauskas <psadauskas@gmail.com>
24  **/
25
26 #include "collectd.h"
27 #include "plugin.h"
28 #include "common.h"
29 #include "utils_cache.h"
30 #include "utils_format_json.h"
31
32 #if HAVE_PTHREAD_H
33 # include <pthread.h>
34 #endif
35
36 #include <curl/curl.h>
37
38 #ifndef WRITE_HTTP_DEFAULT_BUFFER_SIZE
39 # define WRITE_HTTP_DEFAULT_BUFFER_SIZE 4096
40 #endif
41
42 /*
43  * Private variables
44  */
45 struct wh_callback_s
46 {
47         char *name;
48
49         char *location;
50         char *user;
51         char *pass;
52         char *credentials;
53         _Bool verify_peer;
54         _Bool verify_host;
55         char *cacert;
56         char *capath;
57         char *clientkey;
58         char *clientcert;
59         char *clientkeypass;
60         long sslversion;
61         _Bool store_rates;
62         _Bool log_http_error;
63         int   low_speed_limit;
64         time_t low_speed_time;
65         int timeout;
66
67 #define WH_FORMAT_COMMAND 0
68 #define WH_FORMAT_JSON    1
69         int format;
70
71         CURL *curl;
72         char curl_errbuf[CURL_ERROR_SIZE];
73
74         char  *send_buffer;
75         size_t send_buffer_size;
76         size_t send_buffer_free;
77         size_t send_buffer_fill;
78         cdtime_t send_buffer_init_time;
79
80         pthread_mutex_t send_lock;
81 };
82 typedef struct wh_callback_s wh_callback_t;
83
84 static void wh_log_http_error (wh_callback_t *cb)
85 {
86         if (!cb->log_http_error)
87                 return;
88
89         long http_code = 0;
90
91         curl_easy_getinfo (cb->curl, CURLINFO_RESPONSE_CODE, &http_code);
92
93         if (http_code != 200)
94                 INFO ("write_http plugin: HTTP Error code: %lu", http_code);
95 }
96
97 static void wh_reset_buffer (wh_callback_t *cb)  /* {{{ */
98 {
99         memset (cb->send_buffer, 0, cb->send_buffer_size);
100         cb->send_buffer_free = cb->send_buffer_size;
101         cb->send_buffer_fill = 0;
102         cb->send_buffer_init_time = cdtime ();
103
104         if (cb->format == WH_FORMAT_JSON)
105         {
106                 format_json_initialize (cb->send_buffer,
107                                 &cb->send_buffer_fill,
108                                 &cb->send_buffer_free);
109         }
110 } /* }}} wh_reset_buffer */
111
112 static int wh_send_buffer (wh_callback_t *cb) /* {{{ */
113 {
114         int status = 0;
115
116         curl_easy_setopt (cb->curl, CURLOPT_POSTFIELDS, cb->send_buffer);
117         status = curl_easy_perform (cb->curl);
118
119         wh_log_http_error (cb);
120
121         if (status != CURLE_OK)
122         {
123                 ERROR ("write_http plugin: curl_easy_perform failed with "
124                                 "status %i: %s",
125                                 status, cb->curl_errbuf);
126         }
127         return (status);
128 } /* }}} wh_send_buffer */
129
130 static int wh_callback_init (wh_callback_t *cb) /* {{{ */
131 {
132         struct curl_slist *headers;
133
134         if (cb->curl != NULL)
135                 return (0);
136
137         cb->curl = curl_easy_init ();
138         if (cb->curl == NULL)
139         {
140                 ERROR ("curl plugin: curl_easy_init failed.");
141                 return (-1);
142         }
143
144         if (cb->low_speed_limit > 0 && cb->low_speed_time > 0)
145         {
146                 curl_easy_setopt (cb->curl, CURLOPT_LOW_SPEED_LIMIT,
147                                   (long) (cb->low_speed_limit * cb->low_speed_time));
148                 curl_easy_setopt (cb->curl, CURLOPT_LOW_SPEED_TIME,
149                                   (long) cb->low_speed_time);
150         }
151
152 #ifdef HAVE_CURLOPT_TIMEOUT_MS
153         if (cb->timeout > 0)
154                 curl_easy_setopt (cb->curl, CURLOPT_TIMEOUT_MS, (long) cb->timeout);
155 #endif
156
157         curl_easy_setopt (cb->curl, CURLOPT_NOSIGNAL, 1L);
158         curl_easy_setopt (cb->curl, CURLOPT_USERAGENT, COLLECTD_USERAGENT);
159
160         headers = NULL;
161         headers = curl_slist_append (headers, "Accept:  */*");
162         if (cb->format == WH_FORMAT_JSON)
163                 headers = curl_slist_append (headers, "Content-Type: application/json");
164         else
165                 headers = curl_slist_append (headers, "Content-Type: text/plain");
166         headers = curl_slist_append (headers, "Expect:");
167         curl_easy_setopt (cb->curl, CURLOPT_HTTPHEADER, headers);
168
169         curl_easy_setopt (cb->curl, CURLOPT_ERRORBUFFER, cb->curl_errbuf);
170         curl_easy_setopt (cb->curl, CURLOPT_URL, cb->location);
171         curl_easy_setopt (cb->curl, CURLOPT_FOLLOWLOCATION, 1L);
172         curl_easy_setopt (cb->curl, CURLOPT_MAXREDIRS, 50L);
173
174         if (cb->user != NULL)
175         {
176 #ifdef HAVE_CURLOPT_USERNAME
177                 curl_easy_setopt (cb->curl, CURLOPT_USERNAME, cb->user);
178                 curl_easy_setopt (cb->curl, CURLOPT_PASSWORD,
179                         (cb->pass == NULL) ? "" : cb->pass);
180 #else
181                 size_t credentials_size;
182
183                 credentials_size = strlen (cb->user) + 2;
184                 if (cb->pass != NULL)
185                         credentials_size += strlen (cb->pass);
186
187                 cb->credentials = (char *) malloc (credentials_size);
188                 if (cb->credentials == NULL)
189                 {
190                         ERROR ("curl plugin: malloc failed.");
191                         return (-1);
192                 }
193
194                 ssnprintf (cb->credentials, credentials_size, "%s:%s",
195                                 cb->user, (cb->pass == NULL) ? "" : cb->pass);
196                 curl_easy_setopt (cb->curl, CURLOPT_USERPWD, cb->credentials);
197 #endif
198                 curl_easy_setopt (cb->curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
199         }
200
201         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYPEER, (long) cb->verify_peer);
202         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYHOST,
203                         cb->verify_host ? 2L : 0L);
204         curl_easy_setopt (cb->curl, CURLOPT_SSLVERSION, cb->sslversion);
205         if (cb->cacert != NULL)
206                 curl_easy_setopt (cb->curl, CURLOPT_CAINFO, cb->cacert);
207         if (cb->capath != NULL)
208                 curl_easy_setopt (cb->curl, CURLOPT_CAPATH, cb->capath);
209
210         if (cb->clientkey != NULL && cb->clientcert != NULL)
211         {
212             curl_easy_setopt (cb->curl, CURLOPT_SSLKEY, cb->clientkey);
213             curl_easy_setopt (cb->curl, CURLOPT_SSLCERT, cb->clientcert);
214
215             if (cb->clientkeypass != NULL)
216                 curl_easy_setopt (cb->curl, CURLOPT_SSLKEYPASSWD, cb->clientkeypass);
217         }
218
219         wh_reset_buffer (cb);
220
221         return (0);
222 } /* }}} int wh_callback_init */
223
224 static int wh_flush_nolock (cdtime_t timeout, wh_callback_t *cb) /* {{{ */
225 {
226         int status;
227
228         DEBUG ("write_http plugin: wh_flush_nolock: timeout = %.3f; "
229                         "send_buffer_fill = %zu;",
230                         CDTIME_T_TO_DOUBLE (timeout),
231                         cb->send_buffer_fill);
232
233         /* timeout == 0  => flush unconditionally */
234         if (timeout > 0)
235         {
236                 cdtime_t now;
237
238                 now = cdtime ();
239                 if ((cb->send_buffer_init_time + timeout) > now)
240                         return (0);
241         }
242
243         if (cb->format == WH_FORMAT_COMMAND)
244         {
245                 if (cb->send_buffer_fill <= 0)
246                 {
247                         cb->send_buffer_init_time = cdtime ();
248                         return (0);
249                 }
250
251                 status = wh_send_buffer (cb);
252                 wh_reset_buffer (cb);
253         }
254         else if (cb->format == WH_FORMAT_JSON)
255         {
256                 if (cb->send_buffer_fill <= 2)
257                 {
258                         cb->send_buffer_init_time = cdtime ();
259                         return (0);
260                 }
261
262                 status = format_json_finalize (cb->send_buffer,
263                                 &cb->send_buffer_fill,
264                                 &cb->send_buffer_free);
265                 if (status != 0)
266                 {
267                         ERROR ("write_http: wh_flush_nolock: "
268                                         "format_json_finalize failed.");
269                         wh_reset_buffer (cb);
270                         return (status);
271                 }
272
273                 status = wh_send_buffer (cb);
274                 wh_reset_buffer (cb);
275         }
276         else
277         {
278                 ERROR ("write_http: wh_flush_nolock: "
279                                 "Unknown format: %i",
280                                 cb->format);
281                 return (-1);
282         }
283
284         return (status);
285 } /* }}} wh_flush_nolock */
286
287 static int wh_flush (cdtime_t timeout, /* {{{ */
288                 const char *identifier __attribute__((unused)),
289                 user_data_t *user_data)
290 {
291         wh_callback_t *cb;
292         int status;
293
294         if (user_data == NULL)
295                 return (-EINVAL);
296
297         cb = user_data->data;
298
299         pthread_mutex_lock (&cb->send_lock);
300
301         if (cb->curl == NULL)
302         {
303                 status = wh_callback_init (cb);
304                 if (status != 0)
305                 {
306                         ERROR ("write_http plugin: wh_callback_init failed.");
307                         pthread_mutex_unlock (&cb->send_lock);
308                         return (-1);
309                 }
310         }
311
312         status = wh_flush_nolock (timeout, cb);
313         pthread_mutex_unlock (&cb->send_lock);
314
315         return (status);
316 } /* }}} int wh_flush */
317
318 static void wh_callback_free (void *data) /* {{{ */
319 {
320         wh_callback_t *cb;
321
322         if (data == NULL)
323                 return;
324
325         cb = data;
326
327         wh_flush_nolock (/* timeout = */ 0, cb);
328
329         if (cb->curl != NULL)
330         {
331                 curl_easy_cleanup (cb->curl);
332                 cb->curl = NULL;
333         }
334         sfree (cb->name);
335         sfree (cb->location);
336         sfree (cb->user);
337         sfree (cb->pass);
338         sfree (cb->credentials);
339         sfree (cb->cacert);
340         sfree (cb->capath);
341         sfree (cb->clientkey);
342         sfree (cb->clientcert);
343         sfree (cb->clientkeypass);
344         sfree (cb->send_buffer);
345
346         sfree (cb);
347 } /* }}} void wh_callback_free */
348
349 static int wh_write_command (const data_set_t *ds, const value_list_t *vl, /* {{{ */
350                 wh_callback_t *cb)
351 {
352         char key[10*DATA_MAX_NAME_LEN];
353         char values[512];
354         char command[1024];
355         size_t command_len;
356
357         int status;
358
359         if (0 != strcmp (ds->type, vl->type)) {
360                 ERROR ("write_http plugin: DS type does not match "
361                                 "value list type");
362                 return -1;
363         }
364
365         /* Copy the identifier to `key' and escape it. */
366         status = FORMAT_VL (key, sizeof (key), vl);
367         if (status != 0) {
368                 ERROR ("write_http plugin: error with format_name");
369                 return (status);
370         }
371         escape_string (key, sizeof (key));
372
373         /* Convert the values to an ASCII representation and put that into
374          * `values'. */
375         status = format_values (values, sizeof (values), ds, vl, cb->store_rates);
376         if (status != 0) {
377                 ERROR ("write_http plugin: error with "
378                                 "wh_value_list_to_string");
379                 return (status);
380         }
381
382         command_len = (size_t) ssnprintf (command, sizeof (command),
383                         "PUTVAL %s interval=%.3f %s\r\n",
384                         key,
385                         CDTIME_T_TO_DOUBLE (vl->interval),
386                         values);
387         if (command_len >= sizeof (command)) {
388                 ERROR ("write_http plugin: Command buffer too small: "
389                                 "Need %zu bytes.", command_len + 1);
390                 return (-1);
391         }
392
393         pthread_mutex_lock (&cb->send_lock);
394
395         if (cb->curl == NULL)
396         {
397                 status = wh_callback_init (cb);
398                 if (status != 0)
399                 {
400                         ERROR ("write_http plugin: wh_callback_init failed.");
401                         pthread_mutex_unlock (&cb->send_lock);
402                         return (-1);
403                 }
404         }
405
406         if (command_len >= cb->send_buffer_free)
407         {
408                 status = wh_flush_nolock (/* timeout = */ 0, cb);
409                 if (status != 0)
410                 {
411                         pthread_mutex_unlock (&cb->send_lock);
412                         return (status);
413                 }
414         }
415         assert (command_len < cb->send_buffer_free);
416
417         /* `command_len + 1' because `command_len' does not include the
418          * trailing null byte. Neither does `send_buffer_fill'. */
419         memcpy (cb->send_buffer + cb->send_buffer_fill,
420                         command, command_len + 1);
421         cb->send_buffer_fill += command_len;
422         cb->send_buffer_free -= command_len;
423
424         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%) \"%s\"",
425                         cb->location,
426                         cb->send_buffer_fill, cb->send_buffer_size,
427                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size),
428                         command);
429
430         /* Check if we have enough space for this command. */
431         pthread_mutex_unlock (&cb->send_lock);
432
433         return (0);
434 } /* }}} int wh_write_command */
435
436 static int wh_write_json (const data_set_t *ds, const value_list_t *vl, /* {{{ */
437                 wh_callback_t *cb)
438 {
439         int status;
440
441         pthread_mutex_lock (&cb->send_lock);
442
443         if (cb->curl == NULL)
444         {
445                 status = wh_callback_init (cb);
446                 if (status != 0)
447                 {
448                         ERROR ("write_http plugin: wh_callback_init failed.");
449                         pthread_mutex_unlock (&cb->send_lock);
450                         return (-1);
451                 }
452         }
453
454         status = format_json_value_list (cb->send_buffer,
455                         &cb->send_buffer_fill,
456                         &cb->send_buffer_free,
457                         ds, vl, cb->store_rates);
458         if (status == (-ENOMEM))
459         {
460                 status = wh_flush_nolock (/* timeout = */ 0, cb);
461                 if (status != 0)
462                 {
463                         wh_reset_buffer (cb);
464                         pthread_mutex_unlock (&cb->send_lock);
465                         return (status);
466                 }
467
468                 status = format_json_value_list (cb->send_buffer,
469                                 &cb->send_buffer_fill,
470                                 &cb->send_buffer_free,
471                                 ds, vl, cb->store_rates);
472         }
473         if (status != 0)
474         {
475                 pthread_mutex_unlock (&cb->send_lock);
476                 return (status);
477         }
478
479         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%)",
480                         cb->location,
481                         cb->send_buffer_fill, cb->send_buffer_size,
482                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size));
483
484         /* Check if we have enough space for this command. */
485         pthread_mutex_unlock (&cb->send_lock);
486
487         return (0);
488 } /* }}} int wh_write_json */
489
490 static int wh_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
491                 user_data_t *user_data)
492 {
493         wh_callback_t *cb;
494         int status;
495
496         if (user_data == NULL)
497                 return (-EINVAL);
498
499         cb = user_data->data;
500
501         if (cb->format == WH_FORMAT_JSON)
502                 status = wh_write_json (ds, vl, cb);
503         else
504                 status = wh_write_command (ds, vl, cb);
505
506         return (status);
507 } /* }}} int wh_write */
508
509 static int config_set_format (wh_callback_t *cb, /* {{{ */
510                 oconfig_item_t *ci)
511 {
512         char *string;
513
514         if ((ci->values_num != 1)
515                         || (ci->values[0].type != OCONFIG_TYPE_STRING))
516         {
517                 WARNING ("write_http plugin: The `%s' config option "
518                                 "needs exactly one string argument.", ci->key);
519                 return (-1);
520         }
521
522         string = ci->values[0].value.string;
523         if (strcasecmp ("Command", string) == 0)
524                 cb->format = WH_FORMAT_COMMAND;
525         else if (strcasecmp ("JSON", string) == 0)
526                 cb->format = WH_FORMAT_JSON;
527         else
528         {
529                 ERROR ("write_http plugin: Invalid format string: %s",
530                                 string);
531                 return (-1);
532         }
533
534         return (0);
535 } /* }}} int config_set_format */
536
537 static int wh_config_node (oconfig_item_t *ci) /* {{{ */
538 {
539         wh_callback_t *cb;
540         int buffer_size = 0;
541         user_data_t user_data;
542         char callback_name[DATA_MAX_NAME_LEN];
543         int i;
544
545         cb = malloc (sizeof (*cb));
546         if (cb == NULL)
547         {
548                 ERROR ("write_http plugin: malloc failed.");
549                 return (-1);
550         }
551         memset (cb, 0, sizeof (*cb));
552         cb->verify_peer = 1;
553         cb->verify_host = 1;
554         cb->format = WH_FORMAT_COMMAND;
555         cb->sslversion = CURL_SSLVERSION_DEFAULT;
556         cb->low_speed_limit = 0;
557         cb->timeout = 0;
558         cb->log_http_error = 0;
559
560         pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
561
562         cf_util_get_string (ci, &cb->name);
563
564         /* FIXME: Remove this legacy mode in version 6. */
565         if (strcasecmp ("URL", ci->key) == 0)
566                 cf_util_get_string (ci, &cb->location);
567
568         for (i = 0; i < ci->children_num; i++)
569         {
570                 oconfig_item_t *child = ci->children + i;
571
572                 if (strcasecmp ("URL", child->key) == 0)
573                         cf_util_get_string (child, &cb->location);
574                 else if (strcasecmp ("User", child->key) == 0)
575                         cf_util_get_string (child, &cb->user);
576                 else if (strcasecmp ("Password", child->key) == 0)
577                         cf_util_get_string (child, &cb->pass);
578                 else if (strcasecmp ("VerifyPeer", child->key) == 0)
579                         cf_util_get_boolean (child, &cb->verify_peer);
580                 else if (strcasecmp ("VerifyHost", child->key) == 0)
581                         cf_util_get_boolean (child, &cb->verify_host);
582                 else if (strcasecmp ("CACert", child->key) == 0)
583                         cf_util_get_string (child, &cb->cacert);
584                 else if (strcasecmp ("CAPath", child->key) == 0)
585                         cf_util_get_string (child, &cb->capath);
586                 else if (strcasecmp ("ClientKey", child->key) == 0)
587                         cf_util_get_string (child, &cb->clientkey);
588                 else if (strcasecmp ("ClientCert", child->key) == 0)
589                         cf_util_get_string (child, &cb->clientcert);
590                 else if (strcasecmp ("ClientKeyPass", child->key) == 0)
591                         cf_util_get_string (child, &cb->clientkeypass);
592                 else if (strcasecmp ("SSLVersion", child->key) == 0)
593                 {
594                         char *value = NULL;
595
596                         cf_util_get_string (child, &value);
597
598                         if (value == NULL || strcasecmp ("default", value) == 0)
599                                 cb->sslversion = CURL_SSLVERSION_DEFAULT;
600                         else if (strcasecmp ("SSLv2", value) == 0)
601                                 cb->sslversion = CURL_SSLVERSION_SSLv2;
602                         else if (strcasecmp ("SSLv3", value) == 0)
603                                 cb->sslversion = CURL_SSLVERSION_SSLv3;
604                         else if (strcasecmp ("TLSv1", value) == 0)
605                                 cb->sslversion = CURL_SSLVERSION_TLSv1;
606 #if (LIBCURL_VERSION_MAJOR > 7) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR >= 34)
607                         else if (strcasecmp ("TLSv1_0", value) == 0)
608                                 cb->sslversion = CURL_SSLVERSION_TLSv1_0;
609                         else if (strcasecmp ("TLSv1_1", value) == 0)
610                                 cb->sslversion = CURL_SSLVERSION_TLSv1_1;
611                         else if (strcasecmp ("TLSv1_2", value) == 0)
612                                 cb->sslversion = CURL_SSLVERSION_TLSv1_2;
613 #endif
614                         else
615                                 ERROR ("write_http plugin: Invalid SSLVersion "
616                                                 "option: %s.", value);
617
618                         sfree(value);
619                 }
620                 else if (strcasecmp ("Format", child->key) == 0)
621                         config_set_format (cb, child);
622                 else if (strcasecmp ("StoreRates", child->key) == 0)
623                         cf_util_get_boolean (child, &cb->store_rates);
624                 else if (strcasecmp ("BufferSize", child->key) == 0)
625                         cf_util_get_int (child, &buffer_size);
626                 else if (strcasecmp ("LowSpeedLimit", child->key) == 0)
627                         cf_util_get_int (child, &cb->low_speed_limit);
628                 else if (strcasecmp ("Timeout", child->key) == 0)
629                         cf_util_get_int (child, &cb->timeout);
630                 else if (strcasecmp ("LogHttpError", child->key) == 0)
631                         cf_util_get_boolean (child, &cb->log_http_error);
632                 else
633                 {
634                         ERROR ("write_http plugin: Invalid configuration "
635                                         "option: %s.", child->key);
636                 }
637         }
638
639         if (cb->location == NULL)
640         {
641                 ERROR ("write_http plugin: no URL defined for instance '%s'",
642                         cb->name);
643                 wh_callback_free (cb);
644                 return (-1);
645         }
646
647         if (cb->low_speed_limit > 0)
648                 cb->low_speed_time = CDTIME_T_TO_TIME_T(plugin_get_interval());
649
650         /* Determine send_buffer_size. */
651         cb->send_buffer_size = WRITE_HTTP_DEFAULT_BUFFER_SIZE;
652         if (buffer_size >= 1024)
653                 cb->send_buffer_size = (size_t) buffer_size;
654         else if (buffer_size != 0)
655                 ERROR ("write_http plugin: Ignoring invalid BufferSize setting (%d).",
656                                 buffer_size);
657
658         /* Allocate the buffer. */
659         cb->send_buffer = malloc (cb->send_buffer_size);
660         if (cb->send_buffer == NULL)
661         {
662                 ERROR ("write_http plugin: malloc(%zu) failed.", cb->send_buffer_size);
663                 wh_callback_free (cb);
664                 return (-1);
665         }
666         /* Nulls the buffer and sets ..._free and ..._fill. */
667         wh_reset_buffer (cb);
668
669         ssnprintf (callback_name, sizeof (callback_name), "write_http/%s",
670                         cb->name);
671         DEBUG ("write_http: Registering write callback '%s' with URL '%s'",
672                         callback_name, cb->location);
673
674         memset (&user_data, 0, sizeof (user_data));
675         user_data.data = cb;
676         user_data.free_func = NULL;
677         plugin_register_flush (callback_name, wh_flush, &user_data);
678
679         user_data.free_func = wh_callback_free;
680         plugin_register_write (callback_name, wh_write, &user_data);
681
682         return (0);
683 } /* }}} int wh_config_node */
684
685 static int wh_config (oconfig_item_t *ci) /* {{{ */
686 {
687         int i;
688
689         for (i = 0; i < ci->children_num; i++)
690         {
691                 oconfig_item_t *child = ci->children + i;
692
693                 if (strcasecmp ("Node", child->key) == 0)
694                         wh_config_node (child);
695                 /* FIXME: Remove this legacy mode in version 6. */
696                 else if (strcasecmp ("URL", child->key) == 0) {
697                         WARNING ("write_http plugin: Legacy <URL> block found. "
698                                 "Please use <Node> instead.");
699                         wh_config_node (child);
700                 }
701                 else
702                 {
703                         ERROR ("write_http plugin: Invalid configuration "
704                                         "option: %s.", child->key);
705                 }
706         }
707
708         return (0);
709 } /* }}} int wh_config */
710
711 static int wh_init (void) /* {{{ */
712 {
713         /* Call this while collectd is still single-threaded to avoid
714          * initialization issues in libgcrypt. */
715         curl_global_init (CURL_GLOBAL_SSL);
716         return (0);
717 } /* }}} int wh_init */
718
719 void module_register (void) /* {{{ */
720 {
721         plugin_register_complex_config ("write_http", wh_config);
722         plugin_register_init ("write_http", wh_init);
723 } /* }}} void module_register */
724
725 /* vim: set fdm=marker sw=8 ts=8 tw=78 et : */