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