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_format_json.h"
  30
  31 #include <curl/curl.h>
  32
  33 #ifndef WRITE_HTTP_DEFAULT_BUFFER_SIZE
  34 # define WRITE_HTTP_DEFAULT_BUFFER_SIZE 4096
  35 #endif
  36
  37 /*
  38  * Private variables
  39  */
  40 struct wh_callback_s
  41 {
  42         char *name;
  43
  44         char *location;
  45         char *user;
  46         char *pass;
  47         char *credentials;
  48         _Bool verify_peer;
  49         _Bool verify_host;
  50         char *cacert;
  51         char *capath;
  52         char *clientkey;
  53         char *clientcert;
  54         char *clientkeypass;
  55         long sslversion;
  56         _Bool store_rates;
  57         _Bool log_http_error;
  58         int   low_speed_limit;
  59         time_t low_speed_time;
  60         int timeout;
  61
  62 #define WH_FORMAT_COMMAND 0
  63 #define WH_FORMAT_JSON    1
  64         int format;
  65
  66         CURL *curl;
  67         struct curl_slist *headers;
  68         char curl_errbuf[CURL_ERROR_SIZE];
  69
  70         char  *send_buffer;
  71         size_t send_buffer_size;
  72         size_t send_buffer_free;
  73         size_t send_buffer_fill;
  74         cdtime_t send_buffer_init_time;
  75
  76         pthread_mutex_t send_lock;
  77 };
  78 typedef struct wh_callback_s wh_callback_t;
  79
  80 static void wh_log_http_error (wh_callback_t *cb)
  81 {
  82         if (!cb->log_http_error)
  83                 return;
  84
  85         long http_code = 0;
  86
  87         curl_easy_getinfo (cb->curl, CURLINFO_RESPONSE_CODE, &http_code);
  88
  89         if (http_code != 200)
  90                 INFO ("write_http plugin: HTTP Error code: %lu", http_code);
  91 }
  92
  93 static void wh_reset_buffer (wh_callback_t *cb)  /* {{{ */
  94 {
  95         memset (cb->send_buffer, 0, cb->send_buffer_size);
  96         cb->send_buffer_free = cb->send_buffer_size;
  97         cb->send_buffer_fill = 0;
  98         cb->send_buffer_init_time = cdtime ();
  99
 100         if (cb->format == WH_FORMAT_JSON)
 101         {
 102                 format_json_initialize (cb->send_buffer,
 103                                 &cb->send_buffer_fill,
 104                                 &cb->send_buffer_free);
 105         }
 106 } /* }}} wh_reset_buffer */
 107
 108 static int wh_send_buffer (wh_callback_t *cb) /* {{{ */
 109 {
 110         int status = 0;
 111
 112         curl_easy_setopt (cb->curl, CURLOPT_POSTFIELDS, cb->send_buffer);
 113         status = curl_easy_perform (cb->curl);
 114
 115         wh_log_http_error (cb);
 116
 117         if (status != CURLE_OK)
 118         {
 119                 ERROR ("write_http plugin: curl_easy_perform failed with "
 120                                 "status %i: %s",
 121                                 status, cb->curl_errbuf);
 122         }
 123         return (status);
 124 } /* }}} wh_send_buffer */
 125
 126 static int wh_callback_init (wh_callback_t *cb) /* {{{ */
 127 {
 128         if (cb->curl != NULL)
 129                 return (0);
 130
 131         cb->curl = curl_easy_init ();
 132         if (cb->curl == NULL)
 133         {
 134                 ERROR ("curl plugin: curl_easy_init failed.");
 135                 return (-1);
 136         }
 137
 138         if (cb->low_speed_limit > 0 && cb->low_speed_time > 0)
 139         {
 140                 curl_easy_setopt (cb->curl, CURLOPT_LOW_SPEED_LIMIT,
 141                                   (long) (cb->low_speed_limit * cb->low_speed_time));
 142                 curl_easy_setopt (cb->curl, CURLOPT_LOW_SPEED_TIME,
 143                                   (long) cb->low_speed_time);
 144         }
 145
 146 #ifdef HAVE_CURLOPT_TIMEOUT_MS
 147         if (cb->timeout > 0)
 148                 curl_easy_setopt (cb->curl, CURLOPT_TIMEOUT_MS, (long) cb->timeout);
 149 #endif
 150
 151         curl_easy_setopt (cb->curl, CURLOPT_NOSIGNAL, 1L);
 152         curl_easy_setopt (cb->curl, CURLOPT_USERAGENT, COLLECTD_USERAGENT);
 153
 154         cb->headers = curl_slist_append (cb->headers, "Accept:  */*");
 155         if (cb->format == WH_FORMAT_JSON)
 156                 cb->headers = curl_slist_append (cb->headers, "Content-Type: application/json");
 157         else
 158                 cb->headers = curl_slist_append (cb->headers, "Content-Type: text/plain");
 159         cb->headers = curl_slist_append (cb->headers, "Expect:");
 160         curl_easy_setopt (cb->curl, CURLOPT_HTTPHEADER, cb->headers);
 161
 162         curl_easy_setopt (cb->curl, CURLOPT_ERRORBUFFER, cb->curl_errbuf);
 163         curl_easy_setopt (cb->curl, CURLOPT_URL, cb->location);
 164         curl_easy_setopt (cb->curl, CURLOPT_FOLLOWLOCATION, 1L);
 165         curl_easy_setopt (cb->curl, CURLOPT_MAXREDIRS, 50L);
 166
 167         if (cb->user != NULL)
 168         {
 169 #ifdef HAVE_CURLOPT_USERNAME
 170                 curl_easy_setopt (cb->curl, CURLOPT_USERNAME, cb->user);
 171                 curl_easy_setopt (cb->curl, CURLOPT_PASSWORD,
 172                         (cb->pass == NULL) ? "" : cb->pass);
 173 #else
 174                 size_t credentials_size;
 175
 176                 credentials_size = strlen (cb->user) + 2;
 177                 if (cb->pass != NULL)
 178                         credentials_size += strlen (cb->pass);
 179
 180                 cb->credentials = malloc (credentials_size);
 181                 if (cb->credentials == NULL)
 182                 {
 183                         ERROR ("curl plugin: malloc failed.");
 184                         return (-1);
 185                 }
 186
 187                 ssnprintf (cb->credentials, credentials_size, "%s:%s",
 188                                 cb->user, (cb->pass == NULL) ? "" : cb->pass);
 189                 curl_easy_setopt (cb->curl, CURLOPT_USERPWD, cb->credentials);
 190 #endif
 191                 curl_easy_setopt (cb->curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 192         }
 193
 194         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYPEER, (long) cb->verify_peer);
 195         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYHOST,
 196                         cb->verify_host ? 2L : 0L);
 197         curl_easy_setopt (cb->curl, CURLOPT_SSLVERSION, cb->sslversion);
 198         if (cb->cacert != NULL)
 199                 curl_easy_setopt (cb->curl, CURLOPT_CAINFO, cb->cacert);
 200         if (cb->capath != NULL)
 201                 curl_easy_setopt (cb->curl, CURLOPT_CAPATH, cb->capath);
 202
 203         if (cb->clientkey != NULL && cb->clientcert != NULL)
 204         {
 205             curl_easy_setopt (cb->curl, CURLOPT_SSLKEY, cb->clientkey);
 206             curl_easy_setopt (cb->curl, CURLOPT_SSLCERT, cb->clientcert);
 207
 208             if (cb->clientkeypass != NULL)
 209                 curl_easy_setopt (cb->curl, CURLOPT_SSLKEYPASSWD, cb->clientkeypass);
 210         }
 211
 212         wh_reset_buffer (cb);
 213
 214         return (0);
 215 } /* }}} int wh_callback_init */
 216
 217 static int wh_flush_nolock (cdtime_t timeout, wh_callback_t *cb) /* {{{ */
 218 {
 219         int status;
 220
 221         DEBUG ("write_http plugin: wh_flush_nolock: timeout = %.3f; "
 222                         "send_buffer_fill = %zu;",
 223                         CDTIME_T_TO_DOUBLE (timeout),
 224                         cb->send_buffer_fill);
 225
 226         /* timeout == 0  => flush unconditionally */
 227         if (timeout > 0)
 228         {
 229                 cdtime_t now;
 230
 231                 now = cdtime ();
 232                 if ((cb->send_buffer_init_time + timeout) > now)
 233                         return (0);
 234         }
 235
 236         if (cb->format == WH_FORMAT_COMMAND)
 237         {
 238                 if (cb->send_buffer_fill == 0)
 239                 {
 240                         cb->send_buffer_init_time = cdtime ();
 241                         return (0);
 242                 }
 243
 244                 status = wh_send_buffer (cb);
 245                 wh_reset_buffer (cb);
 246         }
 247         else if (cb->format == WH_FORMAT_JSON)
 248         {
 249                 if (cb->send_buffer_fill <= 2)
 250                 {
 251                         cb->send_buffer_init_time = cdtime ();
 252                         return (0);
 253                 }
 254
 255                 status = format_json_finalize (cb->send_buffer,
 256                                 &cb->send_buffer_fill,
 257                                 &cb->send_buffer_free);
 258                 if (status != 0)
 259                 {
 260                         ERROR ("write_http: wh_flush_nolock: "
 261                                         "format_json_finalize failed.");
 262                         wh_reset_buffer (cb);
 263                         return (status);
 264                 }
 265
 266                 status = wh_send_buffer (cb);
 267                 wh_reset_buffer (cb);
 268         }
 269         else
 270         {
 271                 ERROR ("write_http: wh_flush_nolock: "
 272                                 "Unknown format: %i",
 273                                 cb->format);
 274                 return (-1);
 275         }
 276
 277         return (status);
 278 } /* }}} wh_flush_nolock */
 279
 280 static int wh_flush (cdtime_t timeout, /* {{{ */
 281                 const char *identifier __attribute__((unused)),
 282                 user_data_t *user_data)
 283 {
 284         wh_callback_t *cb;
 285         int status;
 286
 287         if (user_data == NULL)
 288                 return (-EINVAL);
 289
 290         cb = user_data->data;
 291
 292         pthread_mutex_lock (&cb->send_lock);
 293
 294         if (cb->curl == NULL)
 295         {
 296                 status = wh_callback_init (cb);
 297                 if (status != 0)
 298                 {
 299                         ERROR ("write_http plugin: wh_callback_init failed.");
 300                         pthread_mutex_unlock (&cb->send_lock);
 301                         return (-1);
 302                 }
 303         }
 304
 305         status = wh_flush_nolock (timeout, cb);
 306         pthread_mutex_unlock (&cb->send_lock);
 307
 308         return (status);
 309 } /* }}} int wh_flush */
 310
 311 static void wh_callback_free (void *data) /* {{{ */
 312 {
 313         wh_callback_t *cb;
 314
 315         if (data == NULL)
 316                 return;
 317
 318         cb = data;
 319
 320         wh_flush_nolock (/* timeout = */ 0, cb);
 321
 322         if (cb->curl != NULL)
 323         {
 324                 curl_easy_cleanup (cb->curl);
 325                 cb->curl = NULL;
 326         }
 327
 328         if (cb->headers != NULL)
 329         {
 330                 curl_slist_free_all (cb->headers);
 331                 cb->headers = NULL;
 332         }
 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_append_string (const char *name, struct curl_slist **dest, /* {{{ */
 538     oconfig_item_t *ci)
 539 {
 540   struct curl_slist *temp = NULL;
 541   if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
 542   {
 543     WARNING ("write_http plugin: `%s' needs exactly one string argument.", name);
 544     return (-1);
 545   }
 546
 547   temp = curl_slist_append(*dest, ci->values[0].value.string);
 548   if (temp == NULL)
 549     return (-1);
 550
 551   *dest = temp;
 552
 553   return (0);
 554 } /* }}} int wh_config_append_string */
 555
 556 static int wh_config_node (oconfig_item_t *ci) /* {{{ */
 557 {
 558         wh_callback_t *cb;
 559         int buffer_size = 0;
 560         user_data_t user_data;
 561         char callback_name[DATA_MAX_NAME_LEN];
 562         int status = 0;
 563         int i;
 564
 565         cb = calloc (1, sizeof (*cb));
 566         if (cb == NULL)
 567         {
 568                 ERROR ("write_http plugin: calloc failed.");
 569                 return (-1);
 570         }
 571         cb->verify_peer = 1;
 572         cb->verify_host = 1;
 573         cb->format = WH_FORMAT_COMMAND;
 574         cb->sslversion = CURL_SSLVERSION_DEFAULT;
 575         cb->low_speed_limit = 0;
 576         cb->timeout = 0;
 577         cb->log_http_error = 0;
 578         cb->headers = NULL;
 579
 580
 581         pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
 582
 583         cf_util_get_string (ci, &cb->name);
 584
 585         /* FIXME: Remove this legacy mode in version 6. */
 586         if (strcasecmp ("URL", ci->key) == 0)
 587                 cf_util_get_string (ci, &cb->location);
 588
 589         for (i = 0; i < ci->children_num; i++)
 590         {
 591                 oconfig_item_t *child = ci->children + i;
 592
 593                 if (strcasecmp ("URL", child->key) == 0)
 594                         status = cf_util_get_string (child, &cb->location);
 595                 else if (strcasecmp ("User", child->key) == 0)
 596                         status = cf_util_get_string (child, &cb->user);
 597                 else if (strcasecmp ("Password", child->key) == 0)
 598                         status = cf_util_get_string (child, &cb->pass);
 599                 else if (strcasecmp ("VerifyPeer", child->key) == 0)
 600                         status = cf_util_get_boolean (child, &cb->verify_peer);
 601                 else if (strcasecmp ("VerifyHost", child->key) == 0)
 602                         status = cf_util_get_boolean (child, &cb->verify_host);
 603                 else if (strcasecmp ("CACert", child->key) == 0)
 604                         status = cf_util_get_string (child, &cb->cacert);
 605                 else if (strcasecmp ("CAPath", child->key) == 0)
 606                         status = cf_util_get_string (child, &cb->capath);
 607                 else if (strcasecmp ("ClientKey", child->key) == 0)
 608                         status = cf_util_get_string (child, &cb->clientkey);
 609                 else if (strcasecmp ("ClientCert", child->key) == 0)
 610                         status = cf_util_get_string (child, &cb->clientcert);
 611                 else if (strcasecmp ("ClientKeyPass", child->key) == 0)
 612                         status = cf_util_get_string (child, &cb->clientkeypass);
 613                 else if (strcasecmp ("SSLVersion", child->key) == 0)
 614                 {
 615                         char *value = NULL;
 616
 617                         status = cf_util_get_string (child, &value);
 618                         if (status != 0)
 619                                 break;
 620
 621                         if (value == NULL || strcasecmp ("default", value) == 0)
 622                                 cb->sslversion = CURL_SSLVERSION_DEFAULT;
 623                         else if (strcasecmp ("SSLv2", value) == 0)
 624                                 cb->sslversion = CURL_SSLVERSION_SSLv2;
 625                         else if (strcasecmp ("SSLv3", value) == 0)
 626                                 cb->sslversion = CURL_SSLVERSION_SSLv3;
 627                         else if (strcasecmp ("TLSv1", value) == 0)
 628                                 cb->sslversion = CURL_SSLVERSION_TLSv1;
 629 #if (LIBCURL_VERSION_MAJOR > 7) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR >= 34)
 630                         else if (strcasecmp ("TLSv1_0", value) == 0)
 631                                 cb->sslversion = CURL_SSLVERSION_TLSv1_0;
 632                         else if (strcasecmp ("TLSv1_1", value) == 0)
 633                                 cb->sslversion = CURL_SSLVERSION_TLSv1_1;
 634                         else if (strcasecmp ("TLSv1_2", value) == 0)
 635                                 cb->sslversion = CURL_SSLVERSION_TLSv1_2;
 636 #endif
 637                         else
 638                         {
 639                                 ERROR ("write_http plugin: Invalid SSLVersion "
 640                                                 "option: %s.", value);
 641                                 status = EINVAL;
 642                         }
 643
 644                         sfree(value);
 645                 }
 646                 else if (strcasecmp ("Format", child->key) == 0)
 647                         status = config_set_format (cb, child);
 648                 else if (strcasecmp ("StoreRates", child->key) == 0)
 649                         status = cf_util_get_boolean (child, &cb->store_rates);
 650                 else if (strcasecmp ("BufferSize", child->key) == 0)
 651                         status = cf_util_get_int (child, &buffer_size);
 652                 else if (strcasecmp ("LowSpeedLimit", child->key) == 0)
 653                         status = cf_util_get_int (child, &cb->low_speed_limit);
 654                 else if (strcasecmp ("Timeout", child->key) == 0)
 655                         status = cf_util_get_int (child, &cb->timeout);
 656                 else if (strcasecmp ("LogHttpError", child->key) == 0)
 657                         status = cf_util_get_boolean (child, &cb->log_http_error);
 658                 else if (strcasecmp ("Header", child->key) == 0)
 659                         status = wh_config_append_string ("Header", &cb->headers, child);
 660                 else
 661                 {
 662                         ERROR ("write_http plugin: Invalid configuration "
 663                                         "option: %s.", child->key);
 664                         status = EINVAL;
 665                 }
 666
 667                 if (status != 0)
 668                         break;
 669         }
 670
 671         if (status != 0)
 672         {
 673                 wh_callback_free (cb);
 674                 return (status);
 675         }
 676
 677         if (cb->location == NULL)
 678         {
 679                 ERROR ("write_http plugin: no URL defined for instance '%s'",
 680                         cb->name);
 681                 wh_callback_free (cb);
 682                 return (-1);
 683         }
 684
 685         if (cb->low_speed_limit > 0)
 686                 cb->low_speed_time = CDTIME_T_TO_TIME_T(plugin_get_interval());
 687
 688         /* Determine send_buffer_size. */
 689         cb->send_buffer_size = WRITE_HTTP_DEFAULT_BUFFER_SIZE;
 690         if (buffer_size >= 1024)
 691                 cb->send_buffer_size = (size_t) buffer_size;
 692         else if (buffer_size != 0)
 693                 ERROR ("write_http plugin: Ignoring invalid BufferSize setting (%d).",
 694                                 buffer_size);
 695
 696         /* Allocate the buffer. */
 697         cb->send_buffer = malloc (cb->send_buffer_size);
 698         if (cb->send_buffer == NULL)
 699         {
 700                 ERROR ("write_http plugin: malloc(%zu) failed.", cb->send_buffer_size);
 701                 wh_callback_free (cb);
 702                 return (-1);
 703         }
 704         /* Nulls the buffer and sets ..._free and ..._fill. */
 705         wh_reset_buffer (cb);
 706
 707         ssnprintf (callback_name, sizeof (callback_name), "write_http/%s",
 708                         cb->name);
 709         DEBUG ("write_http: Registering write callback '%s' with URL '%s'",
 710                         callback_name, cb->location);
 711
 712         memset (&user_data, 0, sizeof (user_data));
 713         user_data.data = cb;
 714         user_data.free_func = NULL;
 715         plugin_register_flush (callback_name, wh_flush, &user_data);
 716
 717         user_data.free_func = wh_callback_free;
 718         plugin_register_write (callback_name, wh_write, &user_data);
 719
 720         return (0);
 721 } /* }}} int wh_config_node */
 722
 723 static int wh_config (oconfig_item_t *ci) /* {{{ */
 724 {
 725         int i;
 726
 727         for (i = 0; i < ci->children_num; i++)
 728         {
 729                 oconfig_item_t *child = ci->children + i;
 730
 731                 if (strcasecmp ("Node", child->key) == 0)
 732                         wh_config_node (child);
 733                 /* FIXME: Remove this legacy mode in version 6. */
 734                 else if (strcasecmp ("URL", child->key) == 0) {
 735                         WARNING ("write_http plugin: Legacy <URL> block found. "
 736                                 "Please use <Node> instead.");
 737                         wh_config_node (child);
 738                 }
 739                 else
 740                 {
 741                         ERROR ("write_http plugin: Invalid configuration "
 742                                         "option: %s.", child->key);
 743                 }
 744         }
 745
 746         return (0);
 747 } /* }}} int wh_config */
 748
 749 static int wh_init (void) /* {{{ */
 750 {
 751         /* Call this while collectd is still single-threaded to avoid
 752          * initialization issues in libgcrypt. */
 753         curl_global_init (CURL_GLOBAL_SSL);
 754         return (0);
 755 } /* }}} int wh_init */
 756
 757 void module_register (void) /* {{{ */
 758 {
 759         plugin_register_complex_config ("write_http", wh_config);
 760         plugin_register_init ("write_http", wh_init);
 761 } /* }}} void module_register */
 762
 763 /* vim: set fdm=marker sw=8 ts=8 tw=78 et : */