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         struct curl_slist *headers;
  73         char curl_errbuf[CURL_ERROR_SIZE];
  74
  75         char  *send_buffer;
  76         size_t send_buffer_size;
  77         size_t send_buffer_free;
  78         size_t send_buffer_fill;
  79         cdtime_t send_buffer_init_time;
  80
  81         pthread_mutex_t send_lock;
  82 };
  83 typedef struct wh_callback_s wh_callback_t;
  84
  85 static void wh_log_http_error (wh_callback_t *cb)
  86 {
  87         if (!cb->log_http_error)
  88                 return;
  89
  90         long http_code = 0;
  91
  92         curl_easy_getinfo (cb->curl, CURLINFO_RESPONSE_CODE, &http_code);
  93
  94         if (http_code != 200)
  95                 INFO ("write_http plugin: HTTP Error code: %lu", http_code);
  96 }
  97
  98 static void wh_reset_buffer (wh_callback_t *cb)  /* {{{ */
  99 {
 100         memset (cb->send_buffer, 0, cb->send_buffer_size);
 101         cb->send_buffer_free = cb->send_buffer_size;
 102         cb->send_buffer_fill = 0;
 103         cb->send_buffer_init_time = cdtime ();
 104
 105         if (cb->format == WH_FORMAT_JSON)
 106         {
 107                 format_json_initialize (cb->send_buffer,
 108                                 &cb->send_buffer_fill,
 109                                 &cb->send_buffer_free);
 110         }
 111 } /* }}} wh_reset_buffer */
 112
 113 static int wh_send_buffer (wh_callback_t *cb) /* {{{ */
 114 {
 115         int status = 0;
 116
 117         curl_easy_setopt (cb->curl, CURLOPT_POSTFIELDS, cb->send_buffer);
 118         status = curl_easy_perform (cb->curl);
 119
 120         wh_log_http_error (cb);
 121
 122         if (status != CURLE_OK)
 123         {
 124                 ERROR ("write_http plugin: curl_easy_perform failed with "
 125                                 "status %i: %s",
 126                                 status, cb->curl_errbuf);
 127         }
 128         return (status);
 129 } /* }}} wh_send_buffer */
 130
 131 static int wh_callback_init (wh_callback_t *cb) /* {{{ */
 132 {
 133         if (cb->curl != NULL)
 134                 return (0);
 135
 136         cb->curl = curl_easy_init ();
 137         if (cb->curl == NULL)
 138         {
 139                 ERROR ("curl plugin: curl_easy_init failed.");
 140                 return (-1);
 141         }
 142
 143         if (cb->low_speed_limit > 0 && cb->low_speed_time > 0)
 144         {
 145                 curl_easy_setopt (cb->curl, CURLOPT_LOW_SPEED_LIMIT,
 146                                   (long) (cb->low_speed_limit * cb->low_speed_time));
 147                 curl_easy_setopt (cb->curl, CURLOPT_LOW_SPEED_TIME,
 148                                   (long) cb->low_speed_time);
 149         }
 150
 151 #ifdef HAVE_CURLOPT_TIMEOUT_MS
 152         if (cb->timeout > 0)
 153                 curl_easy_setopt (cb->curl, CURLOPT_TIMEOUT_MS, (long) cb->timeout);
 154 #endif
 155
 156         curl_easy_setopt (cb->curl, CURLOPT_NOSIGNAL, 1L);
 157         curl_easy_setopt (cb->curl, CURLOPT_USERAGENT, COLLECTD_USERAGENT);
 158
 159         cb->headers = NULL;
 160         cb->headers = curl_slist_append (cb->headers, "Accept:  */*");
 161         if (cb->format == WH_FORMAT_JSON)
 162                 cb->headers = curl_slist_append (cb->headers, "Content-Type: application/json");
 163         else
 164                 cb->headers = curl_slist_append (cb->headers, "Content-Type: text/plain");
 165         cb->headers = curl_slist_append (cb->headers, "Expect:");
 166         curl_easy_setopt (cb->curl, CURLOPT_HTTPHEADER, cb->headers);
 167
 168         curl_easy_setopt (cb->curl, CURLOPT_ERRORBUFFER, cb->curl_errbuf);
 169         curl_easy_setopt (cb->curl, CURLOPT_URL, cb->location);
 170         curl_easy_setopt (cb->curl, CURLOPT_FOLLOWLOCATION, 1L);
 171         curl_easy_setopt (cb->curl, CURLOPT_MAXREDIRS, 50L);
 172
 173         if (cb->user != NULL)
 174         {
 175 #ifdef HAVE_CURLOPT_USERNAME
 176                 curl_easy_setopt (cb->curl, CURLOPT_USERNAME, cb->user);
 177                 curl_easy_setopt (cb->curl, CURLOPT_PASSWORD,
 178                         (cb->pass == NULL) ? "" : cb->pass);
 179 #else
 180                 size_t credentials_size;
 181
 182                 credentials_size = strlen (cb->user) + 2;
 183                 if (cb->pass != NULL)
 184                         credentials_size += strlen (cb->pass);
 185
 186                 cb->credentials = malloc (credentials_size);
 187                 if (cb->credentials == NULL)
 188                 {
 189                         ERROR ("curl plugin: malloc failed.");
 190                         return (-1);
 191                 }
 192
 193                 ssnprintf (cb->credentials, credentials_size, "%s:%s",
 194                                 cb->user, (cb->pass == NULL) ? "" : cb->pass);
 195                 curl_easy_setopt (cb->curl, CURLOPT_USERPWD, cb->credentials);
 196 #endif
 197                 curl_easy_setopt (cb->curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 198         }
 199
 200         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYPEER, (long) cb->verify_peer);
 201         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYHOST,
 202                         cb->verify_host ? 2L : 0L);
 203         curl_easy_setopt (cb->curl, CURLOPT_SSLVERSION, cb->sslversion);
 204         if (cb->cacert != NULL)
 205                 curl_easy_setopt (cb->curl, CURLOPT_CAINFO, cb->cacert);
 206         if (cb->capath != NULL)
 207                 curl_easy_setopt (cb->curl, CURLOPT_CAPATH, cb->capath);
 208
 209         if (cb->clientkey != NULL && cb->clientcert != NULL)
 210         {
 211             curl_easy_setopt (cb->curl, CURLOPT_SSLKEY, cb->clientkey);
 212             curl_easy_setopt (cb->curl, CURLOPT_SSLCERT, cb->clientcert);
 213
 214             if (cb->clientkeypass != NULL)
 215                 curl_easy_setopt (cb->curl, CURLOPT_SSLKEYPASSWD, cb->clientkeypass);
 216         }
 217
 218         wh_reset_buffer (cb);
 219
 220         return (0);
 221 } /* }}} int wh_callback_init */
 222
 223 static int wh_flush_nolock (cdtime_t timeout, wh_callback_t *cb) /* {{{ */
 224 {
 225         int status;
 226
 227         DEBUG ("write_http plugin: wh_flush_nolock: timeout = %.3f; "
 228                         "send_buffer_fill = %zu;",
 229                         CDTIME_T_TO_DOUBLE (timeout),
 230                         cb->send_buffer_fill);
 231
 232         /* timeout == 0  => flush unconditionally */
 233         if (timeout > 0)
 234         {
 235                 cdtime_t now;
 236
 237                 now = cdtime ();
 238                 if ((cb->send_buffer_init_time + timeout) > now)
 239                         return (0);
 240         }
 241
 242         if (cb->format == WH_FORMAT_COMMAND)
 243         {
 244                 if (cb->send_buffer_fill <= 0)
 245                 {
 246                         cb->send_buffer_init_time = cdtime ();
 247                         return (0);
 248                 }
 249
 250                 status = wh_send_buffer (cb);
 251                 wh_reset_buffer (cb);
 252         }
 253         else if (cb->format == WH_FORMAT_JSON)
 254         {
 255                 if (cb->send_buffer_fill <= 2)
 256                 {
 257                         cb->send_buffer_init_time = cdtime ();
 258                         return (0);
 259                 }
 260
 261                 status = format_json_finalize (cb->send_buffer,
 262                                 &cb->send_buffer_fill,
 263                                 &cb->send_buffer_free);
 264                 if (status != 0)
 265                 {
 266                         ERROR ("write_http: wh_flush_nolock: "
 267                                         "format_json_finalize failed.");
 268                         wh_reset_buffer (cb);
 269                         return (status);
 270                 }
 271
 272                 status = wh_send_buffer (cb);
 273                 wh_reset_buffer (cb);
 274         }
 275         else
 276         {
 277                 ERROR ("write_http: wh_flush_nolock: "
 278                                 "Unknown format: %i",
 279                                 cb->format);
 280                 return (-1);
 281         }
 282
 283         return (status);
 284 } /* }}} wh_flush_nolock */
 285
 286 static int wh_flush (cdtime_t timeout, /* {{{ */
 287                 const char *identifier __attribute__((unused)),
 288                 user_data_t *user_data)
 289 {
 290         wh_callback_t *cb;
 291         int status;
 292
 293         if (user_data == NULL)
 294                 return (-EINVAL);
 295
 296         cb = user_data->data;
 297
 298         pthread_mutex_lock (&cb->send_lock);
 299
 300         if (cb->curl == NULL)
 301         {
 302                 status = wh_callback_init (cb);
 303                 if (status != 0)
 304                 {
 305                         ERROR ("write_http plugin: wh_callback_init failed.");
 306                         pthread_mutex_unlock (&cb->send_lock);
 307                         return (-1);
 308                 }
 309         }
 310
 311         status = wh_flush_nolock (timeout, cb);
 312         pthread_mutex_unlock (&cb->send_lock);
 313
 314         return (status);
 315 } /* }}} int wh_flush */
 316
 317 static void wh_callback_free (void *data) /* {{{ */
 318 {
 319         wh_callback_t *cb;
 320
 321         if (data == NULL)
 322                 return;
 323
 324         cb = data;
 325
 326         wh_flush_nolock (/* timeout = */ 0, cb);
 327
 328         if (cb->curl != NULL)
 329         {
 330                 curl_easy_cleanup (cb->curl);
 331                 cb->curl = NULL;
 332         }
 333
 334         if (cb->headers != NULL)
 335         {
 336                 curl_slist_free_all (cb->headers);
 337                 cb->headers = NULL;
 338         }
 339
 340         sfree (cb->name);
 341         sfree (cb->location);
 342         sfree (cb->user);
 343         sfree (cb->pass);
 344         sfree (cb->credentials);
 345         sfree (cb->cacert);
 346         sfree (cb->capath);
 347         sfree (cb->clientkey);
 348         sfree (cb->clientcert);
 349         sfree (cb->clientkeypass);
 350         sfree (cb->send_buffer);
 351
 352         sfree (cb);
 353 } /* }}} void wh_callback_free */
 354
 355 static int wh_write_command (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 356                 wh_callback_t *cb)
 357 {
 358         char key[10*DATA_MAX_NAME_LEN];
 359         char values[512];
 360         char command[1024];
 361         size_t command_len;
 362
 363         int status;
 364
 365         if (0 != strcmp (ds->type, vl->type)) {
 366                 ERROR ("write_http plugin: DS type does not match "
 367                                 "value list type");
 368                 return -1;
 369         }
 370
 371         /* Copy the identifier to `key' and escape it. */
 372         status = FORMAT_VL (key, sizeof (key), vl);
 373         if (status != 0) {
 374                 ERROR ("write_http plugin: error with format_name");
 375                 return (status);
 376         }
 377         escape_string (key, sizeof (key));
 378
 379         /* Convert the values to an ASCII representation and put that into
 380          * `values'. */
 381         status = format_values (values, sizeof (values), ds, vl, cb->store_rates);
 382         if (status != 0) {
 383                 ERROR ("write_http plugin: error with "
 384                                 "wh_value_list_to_string");
 385                 return (status);
 386         }
 387
 388         command_len = (size_t) ssnprintf (command, sizeof (command),
 389                         "PUTVAL %s interval=%.3f %s\r\n",
 390                         key,
 391                         CDTIME_T_TO_DOUBLE (vl->interval),
 392                         values);
 393         if (command_len >= sizeof (command)) {
 394                 ERROR ("write_http plugin: Command buffer too small: "
 395                                 "Need %zu bytes.", command_len + 1);
 396                 return (-1);
 397         }
 398
 399         pthread_mutex_lock (&cb->send_lock);
 400
 401         if (cb->curl == NULL)
 402         {
 403                 status = wh_callback_init (cb);
 404                 if (status != 0)
 405                 {
 406                         ERROR ("write_http plugin: wh_callback_init failed.");
 407                         pthread_mutex_unlock (&cb->send_lock);
 408                         return (-1);
 409                 }
 410         }
 411
 412         if (command_len >= cb->send_buffer_free)
 413         {
 414                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 415                 if (status != 0)
 416                 {
 417                         pthread_mutex_unlock (&cb->send_lock);
 418                         return (status);
 419                 }
 420         }
 421         assert (command_len < cb->send_buffer_free);
 422
 423         /* `command_len + 1' because `command_len' does not include the
 424          * trailing null byte. Neither does `send_buffer_fill'. */
 425         memcpy (cb->send_buffer + cb->send_buffer_fill,
 426                         command, command_len + 1);
 427         cb->send_buffer_fill += command_len;
 428         cb->send_buffer_free -= command_len;
 429
 430         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%) \"%s\"",
 431                         cb->location,
 432                         cb->send_buffer_fill, cb->send_buffer_size,
 433                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size),
 434                         command);
 435
 436         /* Check if we have enough space for this command. */
 437         pthread_mutex_unlock (&cb->send_lock);
 438
 439         return (0);
 440 } /* }}} int wh_write_command */
 441
 442 static int wh_write_json (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 443                 wh_callback_t *cb)
 444 {
 445         int status;
 446
 447         pthread_mutex_lock (&cb->send_lock);
 448
 449         if (cb->curl == NULL)
 450         {
 451                 status = wh_callback_init (cb);
 452                 if (status != 0)
 453                 {
 454                         ERROR ("write_http plugin: wh_callback_init failed.");
 455                         pthread_mutex_unlock (&cb->send_lock);
 456                         return (-1);
 457                 }
 458         }
 459
 460         status = format_json_value_list (cb->send_buffer,
 461                         &cb->send_buffer_fill,
 462                         &cb->send_buffer_free,
 463                         ds, vl, cb->store_rates);
 464         if (status == (-ENOMEM))
 465         {
 466                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 467                 if (status != 0)
 468                 {
 469                         wh_reset_buffer (cb);
 470                         pthread_mutex_unlock (&cb->send_lock);
 471                         return (status);
 472                 }
 473
 474                 status = format_json_value_list (cb->send_buffer,
 475                                 &cb->send_buffer_fill,
 476                                 &cb->send_buffer_free,
 477                                 ds, vl, cb->store_rates);
 478         }
 479         if (status != 0)
 480         {
 481                 pthread_mutex_unlock (&cb->send_lock);
 482                 return (status);
 483         }
 484
 485         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%)",
 486                         cb->location,
 487                         cb->send_buffer_fill, cb->send_buffer_size,
 488                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size));
 489
 490         /* Check if we have enough space for this command. */
 491         pthread_mutex_unlock (&cb->send_lock);
 492
 493         return (0);
 494 } /* }}} int wh_write_json */
 495
 496 static int wh_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 497                 user_data_t *user_data)
 498 {
 499         wh_callback_t *cb;
 500         int status;
 501
 502         if (user_data == NULL)
 503                 return (-EINVAL);
 504
 505         cb = user_data->data;
 506
 507         if (cb->format == WH_FORMAT_JSON)
 508                 status = wh_write_json (ds, vl, cb);
 509         else
 510                 status = wh_write_command (ds, vl, cb);
 511
 512         return (status);
 513 } /* }}} int wh_write */
 514
 515 static int config_set_format (wh_callback_t *cb, /* {{{ */
 516                 oconfig_item_t *ci)
 517 {
 518         char *string;
 519
 520         if ((ci->values_num != 1)
 521                         || (ci->values[0].type != OCONFIG_TYPE_STRING))
 522         {
 523                 WARNING ("write_http plugin: The `%s' config option "
 524                                 "needs exactly one string argument.", ci->key);
 525                 return (-1);
 526         }
 527
 528         string = ci->values[0].value.string;
 529         if (strcasecmp ("Command", string) == 0)
 530                 cb->format = WH_FORMAT_COMMAND;
 531         else if (strcasecmp ("JSON", string) == 0)
 532                 cb->format = WH_FORMAT_JSON;
 533         else
 534         {
 535                 ERROR ("write_http plugin: Invalid format string: %s",
 536                                 string);
 537                 return (-1);
 538         }
 539
 540         return (0);
 541 } /* }}} int config_set_format */
 542
 543 static int wh_config_node (oconfig_item_t *ci) /* {{{ */
 544 {
 545         wh_callback_t *cb;
 546         int buffer_size = 0;
 547         user_data_t user_data;
 548         char callback_name[DATA_MAX_NAME_LEN];
 549         int status = 0;
 550         int i;
 551
 552         cb = calloc (1, sizeof (*cb));
 553         if (cb == NULL)
 554         {
 555                 ERROR ("write_http plugin: calloc failed.");
 556                 return (-1);
 557         }
 558         cb->verify_peer = 1;
 559         cb->verify_host = 1;
 560         cb->format = WH_FORMAT_COMMAND;
 561         cb->sslversion = CURL_SSLVERSION_DEFAULT;
 562         cb->low_speed_limit = 0;
 563         cb->timeout = 0;
 564         cb->log_http_error = 0;
 565         cb->headers = NULL;
 566
 567
 568         pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
 569
 570         cf_util_get_string (ci, &cb->name);
 571
 572         /* FIXME: Remove this legacy mode in version 6. */
 573         if (strcasecmp ("URL", ci->key) == 0)
 574                 cf_util_get_string (ci, &cb->location);
 575
 576         for (i = 0; i < ci->children_num; i++)
 577         {
 578                 oconfig_item_t *child = ci->children + i;
 579
 580                 if (strcasecmp ("URL", child->key) == 0)
 581                         status = cf_util_get_string (child, &cb->location);
 582                 else if (strcasecmp ("User", child->key) == 0)
 583                         status = cf_util_get_string (child, &cb->user);
 584                 else if (strcasecmp ("Password", child->key) == 0)
 585                         status = cf_util_get_string (child, &cb->pass);
 586                 else if (strcasecmp ("VerifyPeer", child->key) == 0)
 587                         status = cf_util_get_boolean (child, &cb->verify_peer);
 588                 else if (strcasecmp ("VerifyHost", child->key) == 0)
 589                         status = cf_util_get_boolean (child, &cb->verify_host);
 590                 else if (strcasecmp ("CACert", child->key) == 0)
 591                         status = cf_util_get_string (child, &cb->cacert);
 592                 else if (strcasecmp ("CAPath", child->key) == 0)
 593                         status = cf_util_get_string (child, &cb->capath);
 594                 else if (strcasecmp ("ClientKey", child->key) == 0)
 595                         status = cf_util_get_string (child, &cb->clientkey);
 596                 else if (strcasecmp ("ClientCert", child->key) == 0)
 597                         status = cf_util_get_string (child, &cb->clientcert);
 598                 else if (strcasecmp ("ClientKeyPass", child->key) == 0)
 599                         status = cf_util_get_string (child, &cb->clientkeypass);
 600                 else if (strcasecmp ("SSLVersion", child->key) == 0)
 601                 {
 602                         char *value = NULL;
 603
 604                         status = cf_util_get_string (child, &value);
 605                         if (status != 0)
 606                                 break;
 607
 608                         if (value == NULL || strcasecmp ("default", value) == 0)
 609                                 cb->sslversion = CURL_SSLVERSION_DEFAULT;
 610                         else if (strcasecmp ("SSLv2", value) == 0)
 611                                 cb->sslversion = CURL_SSLVERSION_SSLv2;
 612                         else if (strcasecmp ("SSLv3", value) == 0)
 613                                 cb->sslversion = CURL_SSLVERSION_SSLv3;
 614                         else if (strcasecmp ("TLSv1", value) == 0)
 615                                 cb->sslversion = CURL_SSLVERSION_TLSv1;
 616 #if (LIBCURL_VERSION_MAJOR > 7) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR >= 34)
 617                         else if (strcasecmp ("TLSv1_0", value) == 0)
 618                                 cb->sslversion = CURL_SSLVERSION_TLSv1_0;
 619                         else if (strcasecmp ("TLSv1_1", value) == 0)
 620                                 cb->sslversion = CURL_SSLVERSION_TLSv1_1;
 621                         else if (strcasecmp ("TLSv1_2", value) == 0)
 622                                 cb->sslversion = CURL_SSLVERSION_TLSv1_2;
 623 #endif
 624                         else
 625                         {
 626                                 ERROR ("write_http plugin: Invalid SSLVersion "
 627                                                 "option: %s.", value);
 628                                 status = EINVAL;
 629                         }
 630
 631                         sfree(value);
 632                 }
 633                 else if (strcasecmp ("Format", child->key) == 0)
 634                         status = config_set_format (cb, child);
 635                 else if (strcasecmp ("StoreRates", child->key) == 0)
 636                         status = cf_util_get_boolean (child, &cb->store_rates);
 637                 else if (strcasecmp ("BufferSize", child->key) == 0)
 638                         status = cf_util_get_int (child, &buffer_size);
 639                 else if (strcasecmp ("LowSpeedLimit", child->key) == 0)
 640                         status = cf_util_get_int (child, &cb->low_speed_limit);
 641                 else if (strcasecmp ("Timeout", child->key) == 0)
 642                         status = cf_util_get_int (child, &cb->timeout);
 643                 else if (strcasecmp ("LogHttpError", child->key) == 0)
 644                         status = cf_util_get_boolean (child, &cb->log_http_error);
 645                 else
 646                 {
 647                         ERROR ("write_http plugin: Invalid configuration "
 648                                         "option: %s.", child->key);
 649                         status = EINVAL;
 650                 }
 651
 652                 if (status != 0)
 653                         break;
 654         }
 655
 656         if (status != 0)
 657         {
 658                 wh_callback_free (cb);
 659                 return (status);
 660         }
 661
 662         if (cb->location == NULL)
 663         {
 664                 ERROR ("write_http plugin: no URL defined for instance '%s'",
 665                         cb->name);
 666                 wh_callback_free (cb);
 667                 return (-1);
 668         }
 669
 670         if (cb->low_speed_limit > 0)
 671                 cb->low_speed_time = CDTIME_T_TO_TIME_T(plugin_get_interval());
 672
 673         /* Determine send_buffer_size. */
 674         cb->send_buffer_size = WRITE_HTTP_DEFAULT_BUFFER_SIZE;
 675         if (buffer_size >= 1024)
 676                 cb->send_buffer_size = (size_t) buffer_size;
 677         else if (buffer_size != 0)
 678                 ERROR ("write_http plugin: Ignoring invalid BufferSize setting (%d).",
 679                                 buffer_size);
 680
 681         /* Allocate the buffer. */
 682         cb->send_buffer = malloc (cb->send_buffer_size);
 683         if (cb->send_buffer == NULL)
 684         {
 685                 ERROR ("write_http plugin: malloc(%zu) failed.", cb->send_buffer_size);
 686                 wh_callback_free (cb);
 687                 return (-1);
 688         }
 689         /* Nulls the buffer and sets ..._free and ..._fill. */
 690         wh_reset_buffer (cb);
 691
 692         ssnprintf (callback_name, sizeof (callback_name), "write_http/%s",
 693                         cb->name);
 694         DEBUG ("write_http: Registering write callback '%s' with URL '%s'",
 695                         callback_name, cb->location);
 696
 697         memset (&user_data, 0, sizeof (user_data));
 698         user_data.data = cb;
 699         user_data.free_func = NULL;
 700         plugin_register_flush (callback_name, wh_flush, &user_data);
 701
 702         user_data.free_func = wh_callback_free;
 703         plugin_register_write (callback_name, wh_write, &user_data);
 704
 705         return (0);
 706 } /* }}} int wh_config_node */
 707
 708 static int wh_config (oconfig_item_t *ci) /* {{{ */
 709 {
 710         int i;
 711
 712         for (i = 0; i < ci->children_num; i++)
 713         {
 714                 oconfig_item_t *child = ci->children + i;
 715
 716                 if (strcasecmp ("Node", child->key) == 0)
 717                         wh_config_node (child);
 718                 /* FIXME: Remove this legacy mode in version 6. */
 719                 else if (strcasecmp ("URL", child->key) == 0) {
 720                         WARNING ("write_http plugin: Legacy <URL> block found. "
 721                                 "Please use <Node> instead.");
 722                         wh_config_node (child);
 723                 }
 724                 else
 725                 {
 726                         ERROR ("write_http plugin: Invalid configuration "
 727                                         "option: %s.", child->key);
 728                 }
 729         }
 730
 731         return (0);
 732 } /* }}} int wh_config */
 733
 734 static int wh_init (void) /* {{{ */
 735 {
 736         /* Call this while collectd is still single-threaded to avoid
 737          * initialization issues in libgcrypt. */
 738         curl_global_init (CURL_GLOBAL_SSL);
 739         return (0);
 740 } /* }}} int wh_init */
 741
 742 void module_register (void) /* {{{ */
 743 {
 744         plugin_register_complex_config ("write_http", wh_config);
 745         plugin_register_init ("write_http", wh_init);
 746 } /* }}} void module_register */
 747
 748 /* vim: set fdm=marker sw=8 ts=8 tw=78 et : */