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                 status = wh_callback_init (cb);
 367                 if (status != 0)
 368                 {
 369                         ERROR ("write_http plugin: wh_callback_init failed.");
 370                         pthread_mutex_unlock (&cb->send_lock);
 371                         return (-1);
 372                 }
 373         }
 374
 375         if (command_len >= cb->send_buffer_free)
 376         {
 377                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 378                 if (status != 0)
 379                 {
 380                         pthread_mutex_unlock (&cb->send_lock);
 381                         return (status);
 382                 }
 383         }
 384         assert (command_len < cb->send_buffer_free);
 385
 386         /* `command_len + 1' because `command_len' does not include the
 387          * trailing null byte. Neither does `send_buffer_fill'. */
 388         memcpy (cb->send_buffer + cb->send_buffer_fill,
 389                         command, command_len + 1);
 390         cb->send_buffer_fill += command_len;
 391         cb->send_buffer_free -= command_len;
 392
 393         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%) \"%s\"",
 394                         cb->location,
 395                         cb->send_buffer_fill, cb->send_buffer_size,
 396                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size),
 397                         command);
 398
 399         /* Check if we have enough space for this command. */
 400         pthread_mutex_unlock (&cb->send_lock);
 401
 402         return (0);
 403 } /* }}} int wh_write_command */
 404
 405 static int wh_write_json (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 406                 wh_callback_t *cb)
 407 {
 408         int status;
 409
 410                 cb->interval = CDTIME_T_TO_TIME_T(vl->interval);
 411
 412         pthread_mutex_lock (&cb->send_lock);
 413
 414         if (cb->curl == NULL)
 415         {
 416                 status = wh_callback_init (cb);
 417                 if (status != 0)
 418                 {
 419                         ERROR ("write_http plugin: wh_callback_init failed.");
 420                         pthread_mutex_unlock (&cb->send_lock);
 421                         return (-1);
 422                 }
 423         }
 424
 425         status = format_json_value_list (cb->send_buffer,
 426                         &cb->send_buffer_fill,
 427                         &cb->send_buffer_free,
 428                         ds, vl, cb->store_rates);
 429         if (status == (-ENOMEM))
 430         {
 431                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 432                 if (status != 0)
 433                 {
 434                         wh_reset_buffer (cb);
 435                         pthread_mutex_unlock (&cb->send_lock);
 436                         return (status);
 437                 }
 438
 439                 status = format_json_value_list (cb->send_buffer,
 440                                 &cb->send_buffer_fill,
 441                                 &cb->send_buffer_free,
 442                                 ds, vl, cb->store_rates);
 443         }
 444         if (status != 0)
 445         {
 446                 pthread_mutex_unlock (&cb->send_lock);
 447                 return (status);
 448         }
 449
 450         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%)",
 451                         cb->location,
 452                         cb->send_buffer_fill, cb->send_buffer_size,
 453                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size));
 454
 455         /* Check if we have enough space for this command. */
 456         pthread_mutex_unlock (&cb->send_lock);
 457
 458         return (0);
 459 } /* }}} int wh_write_json */
 460
 461 static int wh_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 462                 user_data_t *user_data)
 463 {
 464         wh_callback_t *cb;
 465         int status;
 466
 467         if (user_data == NULL)
 468                 return (-EINVAL);
 469
 470         cb = user_data->data;
 471
 472         if (cb->format == WH_FORMAT_JSON)
 473                 status = wh_write_json (ds, vl, cb);
 474         else
 475                 status = wh_write_command (ds, vl, cb);
 476
 477         return (status);
 478 } /* }}} int wh_write */
 479
 480 static int config_set_format (wh_callback_t *cb, /* {{{ */
 481                 oconfig_item_t *ci)
 482 {
 483         char *string;
 484
 485         if ((ci->values_num != 1)
 486                         || (ci->values[0].type != OCONFIG_TYPE_STRING))
 487         {
 488                 WARNING ("write_http plugin: The `%s' config option "
 489                                 "needs exactly one string argument.", ci->key);
 490                 return (-1);
 491         }
 492
 493         string = ci->values[0].value.string;
 494         if (strcasecmp ("Command", string) == 0)
 495                 cb->format = WH_FORMAT_COMMAND;
 496         else if (strcasecmp ("JSON", string) == 0)
 497                 cb->format = WH_FORMAT_JSON;
 498         else
 499         {
 500                 ERROR ("write_http plugin: Invalid format string: %s",
 501                                 string);
 502                 return (-1);
 503         }
 504
 505         return (0);
 506 } /* }}} int config_set_format */
 507
 508 static int wh_config_url (oconfig_item_t *ci) /* {{{ */
 509 {
 510         wh_callback_t *cb;
 511         int buffer_size = 0;
 512         user_data_t user_data;
 513         int i;
 514
 515         cb = malloc (sizeof (*cb));
 516         if (cb == NULL)
 517         {
 518                 ERROR ("write_http plugin: malloc failed.");
 519                 return (-1);
 520         }
 521         memset (cb, 0, sizeof (*cb));
 522         cb->verify_peer = 1;
 523         cb->verify_host = 1;
 524         cb->format = WH_FORMAT_COMMAND;
 525         cb->sslversion = CURL_SSLVERSION_DEFAULT;
 526                 cb->low_limit_bytes = WH_DEFAULT_LOW_LIMIT_BYTES_PER_SEC;
 527
 528         pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
 529
 530         cf_util_get_string (ci, &cb->location);
 531         if (cb->location == NULL)
 532                 return (-1);
 533
 534         for (i = 0; i < ci->children_num; i++)
 535         {
 536                 oconfig_item_t *child = ci->children + i;
 537
 538                 if (strcasecmp ("User", child->key) == 0)
 539                         cf_util_get_string (child, &cb->user);
 540                 else if (strcasecmp ("Password", child->key) == 0)
 541                         cf_util_get_string (child, &cb->pass);
 542                 else if (strcasecmp ("VerifyPeer", child->key) == 0)
 543                         cf_util_get_boolean (child, &cb->verify_peer);
 544                 else if (strcasecmp ("VerifyHost", child->key) == 0)
 545                         cf_util_get_boolean (child, &cb->verify_host);
 546                 else if (strcasecmp ("CACert", child->key) == 0)
 547                         cf_util_get_string (child, &cb->cacert);
 548                 else if (strcasecmp ("CAPath", child->key) == 0)
 549                         cf_util_get_string (child, &cb->capath);
 550                 else if (strcasecmp ("ClientKey", child->key) == 0)
 551                         cf_util_get_string (child, &cb->clientkey);
 552                 else if (strcasecmp ("ClientCert", child->key) == 0)
 553                         cf_util_get_string (child, &cb->clientcert);
 554                 else if (strcasecmp ("ClientKeyPass", child->key) == 0)
 555                         cf_util_get_string (child, &cb->clientkeypass);
 556                 else if (strcasecmp ("SSLVersion", child->key) == 0)
 557                 {
 558                         char *value = NULL;
 559
 560                         cf_util_get_string (child, &value);
 561
 562                         if (value == NULL || strcasecmp ("default", value) == 0)
 563                                 cb->sslversion = CURL_SSLVERSION_DEFAULT;
 564                         else if (strcasecmp ("SSLv2", value) == 0)
 565                                 cb->sslversion = CURL_SSLVERSION_SSLv2;
 566                         else if (strcasecmp ("SSLv3", value) == 0)
 567                                 cb->sslversion = CURL_SSLVERSION_SSLv3;
 568                         else if (strcasecmp ("TLSv1", value) == 0)
 569                                 cb->sslversion = CURL_SSLVERSION_TLSv1;
 570 #if (LIBCURL_VERSION_MAJOR > 7) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR >= 34)
 571                         else if (strcasecmp ("TLSv1_0", value) == 0)
 572                                 cb->sslversion = CURL_SSLVERSION_TLSv1_0;
 573                         else if (strcasecmp ("TLSv1_1", value) == 0)
 574                                 cb->sslversion = CURL_SSLVERSION_TLSv1_1;
 575                         else if (strcasecmp ("TLSv1_2", value) == 0)
 576                                 cb->sslversion = CURL_SSLVERSION_TLSv1_2;
 577 #endif
 578                         else
 579                                 ERROR ("write_http plugin: Invalid SSLVersion "
 580                                                 "option: %s.", value);
 581
 582                         sfree(value);
 583                 }
 584                 else if (strcasecmp ("Format", child->key) == 0)
 585                         config_set_format (cb, child);
 586                 else if (strcasecmp ("StoreRates", child->key) == 0)
 587                         cf_util_get_boolean (child, &cb->store_rates);
 588                 else if (strcasecmp ("BufferSize", child->key) == 0)
 589                         cf_util_get_int (child, &buffer_size);
 590                     else if (strcasecmp ("LowSpeedLimit", child->key) == 0)
 591                         cf_util_get_boolean (child,&cb->abort_on_slow);
 592                 else if (strcasecmp ("LowLimitBytesPerSec", child->key) == 0)
 593                         cf_util_get_int (child, &cb->low_limit_bytes);
 594                 else
 595                 {
 596                         ERROR ("write_http plugin: Invalid configuration "
 597                                         "option: %s.", child->key);
 598                 }
 599         }
 600
 601         if(cb->abort_on_slow)
 602         {
 603                 cb->interval = CDTIME_T_TO_TIME_T(cf_get_default_interval ());
 604         }
 605
 606         /* Determine send_buffer_size. */
 607         cb->send_buffer_size = WRITE_HTTP_DEFAULT_BUFFER_SIZE;
 608         if (buffer_size >= 1024)
 609                 cb->send_buffer_size = (size_t) buffer_size;
 610         else if (buffer_size != 0)
 611                 ERROR ("write_http plugin: Ignoring invalid BufferSize setting (%d).",
 612                                 buffer_size);
 613
 614         /* Allocate the buffer. */
 615         cb->send_buffer = malloc (cb->send_buffer_size);
 616         if (cb->send_buffer == NULL)
 617         {
 618                 ERROR ("write_http plugin: malloc(%zu) failed.", cb->send_buffer_size);
 619                 wh_callback_free (cb);
 620                 return (-1);
 621         }
 622         /* Nulls the buffer and sets ..._free and ..._fill. */
 623         wh_reset_buffer (cb);
 624
 625         DEBUG ("write_http: Registering write callback with URL %s",
 626                         cb->location);
 627
 628         memset (&user_data, 0, sizeof (user_data));
 629         user_data.data = cb;
 630         user_data.free_func = NULL;
 631         plugin_register_flush ("write_http", wh_flush, &user_data);
 632
 633         user_data.free_func = wh_callback_free;
 634         plugin_register_write ("write_http", wh_write, &user_data);
 635
 636         return (0);
 637 } /* }}} int wh_config_url */
 638
 639 static int wh_config (oconfig_item_t *ci) /* {{{ */
 640 {
 641         int i;
 642
 643         for (i = 0; i < ci->children_num; i++)
 644         {
 645                 oconfig_item_t *child = ci->children + i;
 646
 647                 if (strcasecmp ("URL", child->key) == 0)
 648                         wh_config_url (child);
 649                 else
 650                 {
 651                         ERROR ("write_http plugin: Invalid configuration "
 652                                         "option: %s.", child->key);
 653                 }
 654         }
 655
 656         return (0);
 657 } /* }}} int wh_config */
 658
 659 static int wh_init (void) /* {{{ */
 660 {
 661         /* Call this while collectd is still single-threaded to avoid
 662          * initialization issues in libgcrypt. */
 663         curl_global_init (CURL_GLOBAL_SSL);
 664         return (0);
 665 } /* }}} int wh_init */
 666
 667 void module_register (void) /* {{{ */
 668 {
 669         plugin_register_complex_config ("write_http", wh_config);
 670         plugin_register_init ("write_http", wh_init);
 671 } /* }}} void module_register */
 672
 673 /* vim: set fdm=marker sw=8 ts=8 tw=78 et : */