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