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 #define WH_DEFAULT_LOW_LIMIT_BYTES_PER_SEC 100
  43 /*
  44  * Private variables
  45  */
  46 struct wh_callback_s
  47 {
  48         char *location;
  49
  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 abort_on_slow;
  63         int   low_limit_bytes;
  64         time_t interval;
  65
  66 #define WH_FORMAT_COMMAND 0
  67 #define WH_FORMAT_JSON    1
  68         int format;
  69
  70         CURL *curl;
  71         char curl_errbuf[CURL_ERROR_SIZE];
  72
  73         char  *send_buffer;
  74         size_t send_buffer_size;
  75         size_t send_buffer_free;
  76         size_t send_buffer_fill;
  77         cdtime_t send_buffer_init_time;
  78
  79         pthread_mutex_t send_lock;
  80 };
  81 typedef struct wh_callback_s wh_callback_t;
  82
  83 static void wh_reset_buffer (wh_callback_t *cb)  /* {{{ */
  84 {
  85         memset (cb->send_buffer, 0, cb->send_buffer_size);
  86         cb->send_buffer_free = cb->send_buffer_size;
  87         cb->send_buffer_fill = 0;
  88         cb->send_buffer_init_time = cdtime ();
  89
  90         if (cb->format == WH_FORMAT_JSON)
  91         {
  92                 format_json_initialize (cb->send_buffer,
  93                                 &cb->send_buffer_fill,
  94                                 &cb->send_buffer_free);
  95         }
  96 } /* }}} wh_reset_buffer */
  97
  98 static int wh_send_buffer (wh_callback_t *cb) /* {{{ */
  99 {
 100         int status = 0;
 101
 102         curl_easy_setopt (cb->curl, CURLOPT_POSTFIELDS, cb->send_buffer);
 103         status = curl_easy_perform (cb->curl);
 104         if (status != CURLE_OK)
 105         {
 106                 ERROR ("write_http plugin: curl_easy_perform failed with "
 107                                 "status %i: %s",
 108                                 status, cb->curl_errbuf);
 109         }
 110         return (status);
 111 } /* }}} wh_send_buffer */
 112
 113 static int wh_callback_init (wh_callback_t *cb) /* {{{ */
 114 {
 115         struct curl_slist *headers;
 116
 117         if (cb->curl != NULL)
 118                 return (0);
 119
 120         cb->curl = curl_easy_init ();
 121         if (cb->curl == NULL)
 122         {
 123                 ERROR ("curl plugin: curl_easy_init failed.");
 124                 return (-1);
 125         }
 126
 127         if(cb->abort_on_slow && cb->interval > 0)
 128         {
 129             curl_easy_setopt(cb->curl, CURLOPT_LOW_SPEED_LIMIT, (cb->low_limit_bytes?cb->low_limit_bytes:WH_DEFAULT_LOW_LIMIT_BYTES_PER_SEC));
 130             curl_easy_setopt(cb->curl, CURLOPT_LOW_SPEED_TIME, cb->interval);
 131         }
 132
 133         curl_easy_setopt (cb->curl, CURLOPT_NOSIGNAL, 1L);
 134         curl_easy_setopt (cb->curl, CURLOPT_USERAGENT, COLLECTD_USERAGENT);
 135
 136         headers = NULL;
 137         headers = curl_slist_append (headers, "Accept:  */*");
 138         if (cb->format == WH_FORMAT_JSON)
 139                 headers = curl_slist_append (headers, "Content-Type: application/json");
 140         else
 141                 headers = curl_slist_append (headers, "Content-Type: text/plain");
 142         headers = curl_slist_append (headers, "Expect:");
 143         curl_easy_setopt (cb->curl, CURLOPT_HTTPHEADER, headers);
 144
 145         curl_easy_setopt (cb->curl, CURLOPT_ERRORBUFFER, cb->curl_errbuf);
 146         curl_easy_setopt (cb->curl, CURLOPT_URL, cb->location);
 147
 148         if (cb->user != NULL)
 149         {
 150                 size_t credentials_size;
 151
 152                 credentials_size = strlen (cb->user) + 2;
 153                 if (cb->pass != NULL)
 154                         credentials_size += strlen (cb->pass);
 155
 156                 cb->credentials = (char *) malloc (credentials_size);
 157                 if (cb->credentials == NULL)
 158                 {
 159                         ERROR ("curl plugin: malloc failed.");
 160                         return (-1);
 161                 }
 162
 163                 ssnprintf (cb->credentials, credentials_size, "%s:%s",
 164                                 cb->user, (cb->pass == NULL) ? "" : cb->pass);
 165                 curl_easy_setopt (cb->curl, CURLOPT_USERPWD, cb->credentials);
 166                 curl_easy_setopt (cb->curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 167         }
 168
 169         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYPEER, (long) cb->verify_peer);
 170         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYHOST,
 171                         cb->verify_host ? 2L : 0L);
 172         curl_easy_setopt (cb->curl, CURLOPT_SSLVERSION, cb->sslversion);
 173         if (cb->cacert != NULL)
 174                 curl_easy_setopt (cb->curl, CURLOPT_CAINFO, cb->cacert);
 175         if (cb->capath != NULL)
 176                 curl_easy_setopt (cb->curl, CURLOPT_CAPATH, cb->capath);
 177
 178         if (cb->clientkey != NULL && cb->clientcert != NULL)
 179         {
 180             curl_easy_setopt (cb->curl, CURLOPT_SSLKEY, cb->clientkey);
 181             curl_easy_setopt (cb->curl, CURLOPT_SSLCERT, cb->clientcert);
 182
 183             if (cb->clientkeypass != NULL)
 184                 curl_easy_setopt (cb->curl, CURLOPT_SSLKEYPASSWD, cb->clientkeypass);
 185         }
 186
 187         wh_reset_buffer (cb);
 188
 189         return (0);
 190 } /* }}} int wh_callback_init */
 191
 192 static int wh_flush_nolock (cdtime_t timeout, wh_callback_t *cb) /* {{{ */
 193 {
 194         int status;
 195
 196         DEBUG ("write_http plugin: wh_flush_nolock: timeout = %.3f; "
 197                         "send_buffer_fill = %zu;",
 198                         CDTIME_T_TO_DOUBLE (timeout),
 199                         cb->send_buffer_fill);
 200
 201         /* timeout == 0  => flush unconditionally */
 202         if (timeout > 0)
 203         {
 204                 cdtime_t now;
 205
 206                 now = cdtime ();
 207                 if ((cb->send_buffer_init_time + timeout) > now)
 208                         return (0);
 209         }
 210
 211         if (cb->format == WH_FORMAT_COMMAND)
 212         {
 213                 if (cb->send_buffer_fill <= 0)
 214                 {
 215                         cb->send_buffer_init_time = cdtime ();
 216                         return (0);
 217                 }
 218
 219                 status = wh_send_buffer (cb);
 220                 wh_reset_buffer (cb);
 221         }
 222         else if (cb->format == WH_FORMAT_JSON)
 223         {
 224                 if (cb->send_buffer_fill <= 2)
 225                 {
 226                         cb->send_buffer_init_time = cdtime ();
 227                         return (0);
 228                 }
 229
 230                 status = format_json_finalize (cb->send_buffer,
 231                                 &cb->send_buffer_fill,
 232                                 &cb->send_buffer_free);
 233                 if (status != 0)
 234                 {
 235                         ERROR ("write_http: wh_flush_nolock: "
 236                                         "format_json_finalize failed.");
 237                         wh_reset_buffer (cb);
 238                         return (status);
 239                 }
 240
 241                 status = wh_send_buffer (cb);
 242                 wh_reset_buffer (cb);
 243         }
 244         else
 245         {
 246                 ERROR ("write_http: wh_flush_nolock: "
 247                                 "Unknown format: %i",
 248                                 cb->format);
 249                 return (-1);
 250         }
 251
 252         return (status);
 253 } /* }}} wh_flush_nolock */
 254
 255 static int wh_flush (cdtime_t timeout, /* {{{ */
 256                 const char *identifier __attribute__((unused)),
 257                 user_data_t *user_data)
 258 {
 259         wh_callback_t *cb;
 260         int status;
 261
 262         if (user_data == NULL)
 263                 return (-EINVAL);
 264
 265         cb = user_data->data;
 266
 267         pthread_mutex_lock (&cb->send_lock);
 268
 269         if (cb->curl == NULL)
 270         {
 271                 status = wh_callback_init (cb);
 272                 if (status != 0)
 273                 {
 274                         ERROR ("write_http plugin: wh_callback_init failed.");
 275                         pthread_mutex_unlock (&cb->send_lock);
 276                         return (-1);
 277                 }
 278         }
 279
 280         status = wh_flush_nolock (timeout, cb);
 281         pthread_mutex_unlock (&cb->send_lock);
 282
 283         return (status);
 284 } /* }}} int wh_flush */
 285
 286 static void wh_callback_free (void *data) /* {{{ */
 287 {
 288         wh_callback_t *cb;
 289
 290         if (data == NULL)
 291                 return;
 292
 293         cb = data;
 294
 295         wh_flush_nolock (/* timeout = */ 0, cb);
 296
 297         if (cb->curl != NULL)
 298         {
 299                 curl_easy_cleanup (cb->curl);
 300                 cb->curl = NULL;
 301         }
 302         sfree (cb->location);
 303         sfree (cb->user);
 304         sfree (cb->pass);
 305         sfree (cb->credentials);
 306         sfree (cb->cacert);
 307         sfree (cb->capath);
 308         sfree (cb->clientkey);
 309         sfree (cb->clientcert);
 310         sfree (cb->clientkeypass);
 311         sfree (cb->send_buffer);
 312
 313         sfree (cb);
 314 } /* }}} void wh_callback_free */
 315
 316 static int wh_write_command (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 317                 wh_callback_t *cb)
 318 {
 319         char key[10*DATA_MAX_NAME_LEN];
 320         char values[512];
 321         char command[1024];
 322         size_t command_len;
 323
 324         int status;
 325
 326         if (0 != strcmp (ds->type, vl->type)) {
 327                 ERROR ("write_http plugin: DS type does not match "
 328                                 "value list type");
 329                 return -1;
 330         }
 331
 332         /* Copy the identifier to `key' and escape it. */
 333         status = FORMAT_VL (key, sizeof (key), vl);
 334         if (status != 0) {
 335                 ERROR ("write_http plugin: error with format_name");
 336                 return (status);
 337         }
 338         escape_string (key, sizeof (key));
 339
 340         /* Convert the values to an ASCII representation and put that into
 341          * `values'. */
 342         status = format_values (values, sizeof (values), ds, vl, cb->store_rates);
 343         if (status != 0) {
 344                 ERROR ("write_http plugin: error with "
 345                                 "wh_value_list_to_string");
 346                 return (status);
 347         }
 348
 349         command_len = (size_t) ssnprintf (command, sizeof (command),
 350                         "PUTVAL %s interval=%.3f %s\r\n",
 351                         key,
 352                         CDTIME_T_TO_DOUBLE (vl->interval),
 353                         values);
 354         if (command_len >= sizeof (command)) {
 355                 ERROR ("write_http plugin: Command buffer too small: "
 356                                 "Need %zu bytes.", command_len + 1);
 357                 return (-1);
 358         }
 359
 360         cb->interval = CDTIME_T_TO_TIME_T(vl->interval);
 361
 362         pthread_mutex_lock (&cb->send_lock);
 363
 364         if (cb->curl == NULL)
 365         {
 366                 cb->interval = CDTIME_T_TO_TIME_T(vl->interval);
 367                 status = wh_callback_init (cb);
 368                 if (status != 0)
 369                 {
 370                         ERROR ("write_http plugin: wh_callback_init failed.");
 371                         pthread_mutex_unlock (&cb->send_lock);
 372                         return (-1);
 373                 }
 374         }
 375
 376         if (command_len >= cb->send_buffer_free)
 377         {
 378                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 379                 if (status != 0)
 380                 {
 381                         pthread_mutex_unlock (&cb->send_lock);
 382                         return (status);
 383                 }
 384         }
 385         assert (command_len < cb->send_buffer_free);
 386
 387         /* `command_len + 1' because `command_len' does not include the
 388          * trailing null byte. Neither does `send_buffer_fill'. */
 389         memcpy (cb->send_buffer + cb->send_buffer_fill,
 390                         command, command_len + 1);
 391         cb->send_buffer_fill += command_len;
 392         cb->send_buffer_free -= command_len;
 393
 394         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%) \"%s\"",
 395                         cb->location,
 396                         cb->send_buffer_fill, cb->send_buffer_size,
 397                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size),
 398                         command);
 399
 400         /* Check if we have enough space for this command. */
 401         pthread_mutex_unlock (&cb->send_lock);
 402
 403         return (0);
 404 } /* }}} int wh_write_command */
 405
 406 static int wh_write_json (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 407                 wh_callback_t *cb)
 408 {
 409         int status;
 410
 411         pthread_mutex_lock (&cb->send_lock);
 412
 413         if (cb->curl == NULL)
 414         {
 415                 cb->interval = CDTIME_T_TO_TIME_T(vl->interval);
 416
 417                 status = wh_callback_init (cb);
 418                 if (status != 0)
 419                 {
 420                         ERROR ("write_http plugin: wh_callback_init failed.");
 421                         pthread_mutex_unlock (&cb->send_lock);
 422                         return (-1);
 423                 }
 424         }
 425
 426         status = format_json_value_list (cb->send_buffer,
 427                         &cb->send_buffer_fill,
 428                         &cb->send_buffer_free,
 429                         ds, vl, cb->store_rates);
 430         if (status == (-ENOMEM))
 431         {
 432                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 433                 if (status != 0)
 434                 {
 435                         wh_reset_buffer (cb);
 436                         pthread_mutex_unlock (&cb->send_lock);
 437                         return (status);
 438                 }
 439
 440                 status = format_json_value_list (cb->send_buffer,
 441                                 &cb->send_buffer_fill,
 442                                 &cb->send_buffer_free,
 443                                 ds, vl, cb->store_rates);
 444         }
 445         if (status != 0)
 446         {
 447                 pthread_mutex_unlock (&cb->send_lock);
 448                 return (status);
 449         }
 450
 451         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%)",
 452                         cb->location,
 453                         cb->send_buffer_fill, cb->send_buffer_size,
 454                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size));
 455
 456         /* Check if we have enough space for this command. */
 457         pthread_mutex_unlock (&cb->send_lock);
 458
 459         return (0);
 460 } /* }}} int wh_write_json */
 461
 462 static int wh_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 463                 user_data_t *user_data)
 464 {
 465         wh_callback_t *cb;
 466         int status;
 467
 468         if (user_data == NULL)
 469                 return (-EINVAL);
 470
 471         cb = user_data->data;
 472
 473         if (cb->format == WH_FORMAT_JSON)
 474                 status = wh_write_json (ds, vl, cb);
 475         else
 476                 status = wh_write_command (ds, vl, cb);
 477
 478         return (status);
 479 } /* }}} int wh_write */
 480
 481 static int config_set_format (wh_callback_t *cb, /* {{{ */
 482                 oconfig_item_t *ci)
 483 {
 484         char *string;
 485
 486         if ((ci->values_num != 1)
 487                         || (ci->values[0].type != OCONFIG_TYPE_STRING))
 488         {
 489                 WARNING ("write_http plugin: The `%s' config option "
 490                                 "needs exactly one string argument.", ci->key);
 491                 return (-1);
 492         }
 493
 494         string = ci->values[0].value.string;
 495         if (strcasecmp ("Command", string) == 0)
 496                 cb->format = WH_FORMAT_COMMAND;
 497         else if (strcasecmp ("JSON", string) == 0)
 498                 cb->format = WH_FORMAT_JSON;
 499         else
 500         {
 501                 ERROR ("write_http plugin: Invalid format string: %s",
 502                                 string);
 503                 return (-1);
 504         }
 505
 506         return (0);
 507 } /* }}} int config_set_format */
 508
 509 static int wh_config_url (oconfig_item_t *ci) /* {{{ */
 510 {
 511         wh_callback_t *cb;
 512         int buffer_size = 0;
 513         user_data_t user_data;
 514         int i;
 515
 516         cb = malloc (sizeof (*cb));
 517         if (cb == NULL)
 518         {
 519                 ERROR ("write_http plugin: malloc failed.");
 520                 return (-1);
 521         }
 522         memset (cb, 0, sizeof (*cb));
 523         cb->verify_peer = 1;
 524         cb->verify_host = 1;
 525         cb->format = WH_FORMAT_COMMAND;
 526         cb->sslversion = CURL_SSLVERSION_DEFAULT;
 527         cb->low_limit_bytes = WH_DEFAULT_LOW_LIMIT_BYTES_PER_SEC;
 528
 529         pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
 530
 531         cf_util_get_string (ci, &cb->location);
 532         if (cb->location == NULL)
 533                 return (-1);
 534
 535         for (i = 0; i < ci->children_num; i++)
 536         {
 537                 oconfig_item_t *child = ci->children + i;
 538
 539                 if (strcasecmp ("User", child->key) == 0)
 540                         cf_util_get_string (child, &cb->user);
 541                 else if (strcasecmp ("Password", child->key) == 0)
 542                         cf_util_get_string (child, &cb->pass);
 543                 else if (strcasecmp ("VerifyPeer", child->key) == 0)
 544                         cf_util_get_boolean (child, &cb->verify_peer);
 545                 else if (strcasecmp ("VerifyHost", child->key) == 0)
 546                         cf_util_get_boolean (child, &cb->verify_host);
 547                 else if (strcasecmp ("CACert", child->key) == 0)
 548                         cf_util_get_string (child, &cb->cacert);
 549                 else if (strcasecmp ("CAPath", child->key) == 0)
 550                         cf_util_get_string (child, &cb->capath);
 551                 else if (strcasecmp ("ClientKey", child->key) == 0)
 552                         cf_util_get_string (child, &cb->clientkey);
 553                 else if (strcasecmp ("ClientCert", child->key) == 0)
 554                         cf_util_get_string (child, &cb->clientcert);
 555                 else if (strcasecmp ("ClientKeyPass", child->key) == 0)
 556                         cf_util_get_string (child, &cb->clientkeypass);
 557                 else if (strcasecmp ("SSLVersion", child->key) == 0)
 558                 {
 559                         char *value = NULL;
 560
 561                         cf_util_get_string (child, &value);
 562
 563                         if (value == NULL || strcasecmp ("default", value) == 0)
 564                                 cb->sslversion = CURL_SSLVERSION_DEFAULT;
 565                         else if (strcasecmp ("SSLv2", value) == 0)
 566                                 cb->sslversion = CURL_SSLVERSION_SSLv2;
 567                         else if (strcasecmp ("SSLv3", value) == 0)
 568                                 cb->sslversion = CURL_SSLVERSION_SSLv3;
 569                         else if (strcasecmp ("TLSv1", value) == 0)
 570                                 cb->sslversion = CURL_SSLVERSION_TLSv1;
 571 #if (LIBCURL_VERSION_MAJOR > 7) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR >= 34)
 572                         else if (strcasecmp ("TLSv1_0", value) == 0)
 573                                 cb->sslversion = CURL_SSLVERSION_TLSv1_0;
 574                         else if (strcasecmp ("TLSv1_1", value) == 0)
 575                                 cb->sslversion = CURL_SSLVERSION_TLSv1_1;
 576                         else if (strcasecmp ("TLSv1_2", value) == 0)
 577                                 cb->sslversion = CURL_SSLVERSION_TLSv1_2;
 578 #endif
 579                         else
 580                                 ERROR ("write_http plugin: Invalid SSLVersion "
 581                                                 "option: %s.", value);
 582
 583                         sfree(value);
 584                 }
 585                 else if (strcasecmp ("Format", child->key) == 0)
 586                         config_set_format (cb, child);
 587                 else if (strcasecmp ("StoreRates", child->key) == 0)
 588                         cf_util_get_boolean (child, &cb->store_rates);
 589                 else if (strcasecmp ("BufferSize", child->key) == 0)
 590                         cf_util_get_int (child, &buffer_size);
 591                 else if (strcasecmp ("LowSpeedLimit", child->key) == 0)
 592                         cf_util_get_boolean (child,&cb->abort_on_slow);
 593                 else if (strcasecmp ("LowLimitBytesPerSec", child->key) == 0)
 594                         cf_util_get_int (child, &cb->low_limit_bytes);
 595                 else
 596                 {
 597                         ERROR ("write_http plugin: Invalid configuration "
 598                                         "option: %s.", child->key);
 599                 }
 600         }
 601
 602         if(cb->abort_on_slow)
 603         {
 604                 cb->interval = CDTIME_T_TO_TIME_T(cf_get_default_interval ());
 605         }
 606
 607         /* Determine send_buffer_size. */
 608         cb->send_buffer_size = WRITE_HTTP_DEFAULT_BUFFER_SIZE;
 609         if (buffer_size >= 1024)
 610                 cb->send_buffer_size = (size_t) buffer_size;
 611         else if (buffer_size != 0)
 612                 ERROR ("write_http plugin: Ignoring invalid BufferSize setting (%d).",
 613                                 buffer_size);
 614
 615         /* Allocate the buffer. */
 616         cb->send_buffer = malloc (cb->send_buffer_size);
 617         if (cb->send_buffer == NULL)
 618         {
 619                 ERROR ("write_http plugin: malloc(%zu) failed.", cb->send_buffer_size);
 620                 wh_callback_free (cb);
 621                 return (-1);
 622         }
 623         /* Nulls the buffer and sets ..._free and ..._fill. */
 624         wh_reset_buffer (cb);
 625
 626         DEBUG ("write_http: Registering write callback with URL %s",
 627                         cb->location);
 628
 629         memset (&user_data, 0, sizeof (user_data));
 630         user_data.data = cb;
 631         user_data.free_func = NULL;
 632         plugin_register_flush ("write_http", wh_flush, &user_data);
 633
 634         user_data.free_func = wh_callback_free;
 635         plugin_register_write ("write_http", wh_write, &user_data);
 636
 637         return (0);
 638 } /* }}} int wh_config_url */
 639
 640 static int wh_config (oconfig_item_t *ci) /* {{{ */
 641 {
 642         int i;
 643
 644         for (i = 0; i < ci->children_num; i++)
 645         {
 646                 oconfig_item_t *child = ci->children + i;
 647
 648                 if (strcasecmp ("URL", child->key) == 0)
 649                         wh_config_url (child);
 650                 else
 651                 {
 652                         ERROR ("write_http plugin: Invalid configuration "
 653                                         "option: %s.", child->key);
 654                 }
 655         }
 656
 657         return (0);
 658 } /* }}} int wh_config */
 659
 660 static int wh_init (void) /* {{{ */
 661 {
 662         /* Call this while collectd is still single-threaded to avoid
 663          * initialization issues in libgcrypt. */
 664         curl_global_init (CURL_GLOBAL_SSL);
 665         return (0);
 666 } /* }}} int wh_init */
 667
 668 void module_register (void) /* {{{ */
 669 {
 670         plugin_register_complex_config ("write_http", wh_config);
 671         plugin_register_init ("write_http", wh_init);
 672 } /* }}} void module_register */
 673
 674 /* vim: set fdm=marker sw=8 ts=8 tw=78 et : */