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