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 #include <curl/curl.h>
  33
  34 #ifndef WRITE_HTTP_DEFAULT_BUFFER_SIZE
  35 # define WRITE_HTTP_DEFAULT_BUFFER_SIZE 4096
  36 #endif
  37
  38 /*
  39  * Private variables
  40  */
  41 struct wh_callback_s
  42 {
  43         char *name;
  44
  45         char *location;
  46         char *user;
  47         char *pass;
  48         char *credentials;
  49         _Bool verify_peer;
  50         _Bool verify_host;
  51         char *cacert;
  52         char *capath;
  53         char *clientkey;
  54         char *clientcert;
  55         char *clientkeypass;
  56         long sslversion;
  57         _Bool store_rates;
  58         _Bool log_http_error;
  59         int   low_speed_limit;
  60         time_t low_speed_time;
  61         int timeout;
  62
  63 #define WH_FORMAT_COMMAND 0
  64 #define WH_FORMAT_JSON    1
  65         int format;
  66
  67         CURL *curl;
  68         struct curl_slist *headers;
  69         char curl_errbuf[CURL_ERROR_SIZE];
  70
  71         char  *send_buffer;
  72         size_t send_buffer_size;
  73         size_t send_buffer_free;
  74         size_t send_buffer_fill;
  75         cdtime_t send_buffer_init_time;
  76
  77         pthread_mutex_t send_lock;
  78 };
  79 typedef struct wh_callback_s wh_callback_t;
  80
  81 static void wh_log_http_error (wh_callback_t *cb)
  82 {
  83         if (!cb->log_http_error)
  84                 return;
  85
  86         long http_code = 0;
  87
  88         curl_easy_getinfo (cb->curl, CURLINFO_RESPONSE_CODE, &http_code);
  89
  90         if (http_code != 200)
  91                 INFO ("write_http plugin: HTTP Error code: %lu", http_code);
  92 }
  93
  94 static void wh_reset_buffer (wh_callback_t *cb)  /* {{{ */
  95 {
  96         memset (cb->send_buffer, 0, cb->send_buffer_size);
  97         cb->send_buffer_free = cb->send_buffer_size;
  98         cb->send_buffer_fill = 0;
  99         cb->send_buffer_init_time = cdtime ();
 100
 101         if (cb->format == WH_FORMAT_JSON)
 102         {
 103                 format_json_initialize (cb->send_buffer,
 104                                 &cb->send_buffer_fill,
 105                                 &cb->send_buffer_free);
 106         }
 107 } /* }}} wh_reset_buffer */
 108
 109 static int wh_send_buffer (wh_callback_t *cb) /* {{{ */
 110 {
 111         int status = 0;
 112
 113         curl_easy_setopt (cb->curl, CURLOPT_POSTFIELDS, cb->send_buffer);
 114         status = curl_easy_perform (cb->curl);
 115
 116         wh_log_http_error (cb);
 117
 118         if (status != CURLE_OK)
 119         {
 120                 ERROR ("write_http plugin: curl_easy_perform failed with "
 121                                 "status %i: %s",
 122                                 status, cb->curl_errbuf);
 123         }
 124         return (status);
 125 } /* }}} wh_send_buffer */
 126
 127 static int wh_callback_init (wh_callback_t *cb) /* {{{ */
 128 {
 129         if (cb->curl != NULL)
 130                 return (0);
 131
 132         cb->curl = curl_easy_init ();
 133         if (cb->curl == NULL)
 134         {
 135                 ERROR ("curl plugin: curl_easy_init failed.");
 136                 return (-1);
 137         }
 138
 139         if (cb->low_speed_limit > 0 && cb->low_speed_time > 0)
 140         {
 141                 curl_easy_setopt (cb->curl, CURLOPT_LOW_SPEED_LIMIT,
 142                                   (long) (cb->low_speed_limit * cb->low_speed_time));
 143                 curl_easy_setopt (cb->curl, CURLOPT_LOW_SPEED_TIME,
 144                                   (long) cb->low_speed_time);
 145         }
 146
 147 #ifdef HAVE_CURLOPT_TIMEOUT_MS
 148         if (cb->timeout > 0)
 149                 curl_easy_setopt (cb->curl, CURLOPT_TIMEOUT_MS, (long) cb->timeout);
 150 #endif
 151
 152         curl_easy_setopt (cb->curl, CURLOPT_NOSIGNAL, 1L);
 153         curl_easy_setopt (cb->curl, CURLOPT_USERAGENT, COLLECTD_USERAGENT);
 154
 155         cb->headers = curl_slist_append (cb->headers, "Accept:  */*");
 156         if (cb->format == WH_FORMAT_JSON)
 157                 cb->headers = curl_slist_append (cb->headers, "Content-Type: application/json");
 158         else
 159                 cb->headers = curl_slist_append (cb->headers, "Content-Type: text/plain");
 160         cb->headers = curl_slist_append (cb->headers, "Expect:");
 161         curl_easy_setopt (cb->curl, CURLOPT_HTTPHEADER, cb->headers);
 162
 163         curl_easy_setopt (cb->curl, CURLOPT_ERRORBUFFER, cb->curl_errbuf);
 164         curl_easy_setopt (cb->curl, CURLOPT_URL, cb->location);
 165         curl_easy_setopt (cb->curl, CURLOPT_FOLLOWLOCATION, 1L);
 166         curl_easy_setopt (cb->curl, CURLOPT_MAXREDIRS, 50L);
 167
 168         if (cb->user != NULL)
 169         {
 170 #ifdef HAVE_CURLOPT_USERNAME
 171                 curl_easy_setopt (cb->curl, CURLOPT_USERNAME, cb->user);
 172                 curl_easy_setopt (cb->curl, CURLOPT_PASSWORD,
 173                         (cb->pass == NULL) ? "" : cb->pass);
 174 #else
 175                 size_t credentials_size;
 176
 177                 credentials_size = strlen (cb->user) + 2;
 178                 if (cb->pass != NULL)
 179                         credentials_size += strlen (cb->pass);
 180
 181                 cb->credentials = malloc (credentials_size);
 182                 if (cb->credentials == NULL)
 183                 {
 184                         ERROR ("curl plugin: malloc failed.");
 185                         return (-1);
 186                 }
 187
 188                 ssnprintf (cb->credentials, credentials_size, "%s:%s",
 189                                 cb->user, (cb->pass == NULL) ? "" : cb->pass);
 190                 curl_easy_setopt (cb->curl, CURLOPT_USERPWD, cb->credentials);
 191 #endif
 192                 curl_easy_setopt (cb->curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 193         }
 194
 195         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYPEER, (long) cb->verify_peer);
 196         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYHOST,
 197                         cb->verify_host ? 2L : 0L);
 198         curl_easy_setopt (cb->curl, CURLOPT_SSLVERSION, cb->sslversion);
 199         if (cb->cacert != NULL)
 200                 curl_easy_setopt (cb->curl, CURLOPT_CAINFO, cb->cacert);
 201         if (cb->capath != NULL)
 202                 curl_easy_setopt (cb->curl, CURLOPT_CAPATH, cb->capath);
 203
 204         if (cb->clientkey != NULL && cb->clientcert != NULL)
 205         {
 206             curl_easy_setopt (cb->curl, CURLOPT_SSLKEY, cb->clientkey);
 207             curl_easy_setopt (cb->curl, CURLOPT_SSLCERT, cb->clientcert);
 208
 209             if (cb->clientkeypass != NULL)
 210                 curl_easy_setopt (cb->curl, CURLOPT_SSLKEYPASSWD, cb->clientkeypass);
 211         }
 212
 213         wh_reset_buffer (cb);
 214
 215         return (0);
 216 } /* }}} int wh_callback_init */
 217
 218 static int wh_flush_nolock (cdtime_t timeout, wh_callback_t *cb) /* {{{ */
 219 {
 220         int status;
 221
 222         DEBUG ("write_http plugin: wh_flush_nolock: timeout = %.3f; "
 223                         "send_buffer_fill = %zu;",
 224                         CDTIME_T_TO_DOUBLE (timeout),
 225                         cb->send_buffer_fill);
 226
 227         /* timeout == 0  => flush unconditionally */
 228         if (timeout > 0)
 229         {
 230                 cdtime_t now;
 231
 232                 now = cdtime ();
 233                 if ((cb->send_buffer_init_time + timeout) > now)
 234                         return (0);
 235         }
 236
 237         if (cb->format == WH_FORMAT_COMMAND)
 238         {
 239                 if (cb->send_buffer_fill == 0)
 240                 {
 241                         cb->send_buffer_init_time = cdtime ();
 242                         return (0);
 243                 }
 244
 245                 status = wh_send_buffer (cb);
 246                 wh_reset_buffer (cb);
 247         }
 248         else if (cb->format == WH_FORMAT_JSON)
 249         {
 250                 if (cb->send_buffer_fill <= 2)
 251                 {
 252                         cb->send_buffer_init_time = cdtime ();
 253                         return (0);
 254                 }
 255
 256                 status = format_json_finalize (cb->send_buffer,
 257                                 &cb->send_buffer_fill,
 258                                 &cb->send_buffer_free);
 259                 if (status != 0)
 260                 {
 261                         ERROR ("write_http: wh_flush_nolock: "
 262                                         "format_json_finalize failed.");
 263                         wh_reset_buffer (cb);
 264                         return (status);
 265                 }
 266
 267                 status = wh_send_buffer (cb);
 268                 wh_reset_buffer (cb);
 269         }
 270         else
 271         {
 272                 ERROR ("write_http: wh_flush_nolock: "
 273                                 "Unknown format: %i",
 274                                 cb->format);
 275                 return (-1);
 276         }
 277
 278         return (status);
 279 } /* }}} wh_flush_nolock */
 280
 281 static int wh_flush (cdtime_t timeout, /* {{{ */
 282                 const char *identifier __attribute__((unused)),
 283                 user_data_t *user_data)
 284 {
 285         wh_callback_t *cb;
 286         int status;
 287
 288         if (user_data == NULL)
 289                 return (-EINVAL);
 290
 291         cb = user_data->data;
 292
 293         pthread_mutex_lock (&cb->send_lock);
 294
 295         if (cb->curl == NULL)
 296         {
 297                 status = wh_callback_init (cb);
 298                 if (status != 0)
 299                 {
 300                         ERROR ("write_http plugin: wh_callback_init failed.");
 301                         pthread_mutex_unlock (&cb->send_lock);
 302                         return (-1);
 303                 }
 304         }
 305
 306         status = wh_flush_nolock (timeout, cb);
 307         pthread_mutex_unlock (&cb->send_lock);
 308
 309         return (status);
 310 } /* }}} int wh_flush */
 311
 312 static void wh_callback_free (void *data) /* {{{ */
 313 {
 314         wh_callback_t *cb;
 315
 316         if (data == NULL)
 317                 return;
 318
 319         cb = data;
 320
 321         wh_flush_nolock (/* timeout = */ 0, cb);
 322
 323         if (cb->curl != NULL)
 324         {
 325                 curl_easy_cleanup (cb->curl);
 326                 cb->curl = NULL;
 327         }
 328
 329         if (cb->headers != NULL)
 330         {
 331                 curl_slist_free_all (cb->headers);
 332                 cb->headers = NULL;
 333         }
 334
 335         sfree (cb->name);
 336         sfree (cb->location);
 337         sfree (cb->user);
 338         sfree (cb->pass);
 339         sfree (cb->credentials);
 340         sfree (cb->cacert);
 341         sfree (cb->capath);
 342         sfree (cb->clientkey);
 343         sfree (cb->clientcert);
 344         sfree (cb->clientkeypass);
 345         sfree (cb->send_buffer);
 346
 347         sfree (cb);
 348 } /* }}} void wh_callback_free */
 349
 350 static int wh_write_command (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 351                 wh_callback_t *cb)
 352 {
 353         char key[10*DATA_MAX_NAME_LEN];
 354         char values[512];
 355         char command[1024];
 356         size_t command_len;
 357
 358         int status;
 359
 360         if (0 != strcmp (ds->type, vl->type)) {
 361                 ERROR ("write_http plugin: DS type does not match "
 362                                 "value list type");
 363                 return -1;
 364         }
 365
 366         /* Copy the identifier to `key' and escape it. */
 367         status = FORMAT_VL (key, sizeof (key), vl);
 368         if (status != 0) {
 369                 ERROR ("write_http plugin: error with format_name");
 370                 return (status);
 371         }
 372         escape_string (key, sizeof (key));
 373
 374         /* Convert the values to an ASCII representation and put that into
 375          * `values'. */
 376         status = format_values (values, sizeof (values), ds, vl, cb->store_rates);
 377         if (status != 0) {
 378                 ERROR ("write_http plugin: error with "
 379                                 "wh_value_list_to_string");
 380                 return (status);
 381         }
 382
 383         command_len = (size_t) ssnprintf (command, sizeof (command),
 384                         "PUTVAL %s interval=%.3f %s\r\n",
 385                         key,
 386                         CDTIME_T_TO_DOUBLE (vl->interval),
 387                         values);
 388         if (command_len >= sizeof (command)) {
 389                 ERROR ("write_http plugin: Command buffer too small: "
 390                                 "Need %zu bytes.", command_len + 1);
 391                 return (-1);
 392         }
 393
 394         pthread_mutex_lock (&cb->send_lock);
 395
 396         if (cb->curl == NULL)
 397         {
 398                 status = wh_callback_init (cb);
 399                 if (status != 0)
 400                 {
 401                         ERROR ("write_http plugin: wh_callback_init failed.");
 402                         pthread_mutex_unlock (&cb->send_lock);
 403                         return (-1);
 404                 }
 405         }
 406
 407         if (command_len >= cb->send_buffer_free)
 408         {
 409                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 410                 if (status != 0)
 411                 {
 412                         pthread_mutex_unlock (&cb->send_lock);
 413                         return (status);
 414                 }
 415         }
 416         assert (command_len < cb->send_buffer_free);
 417
 418         /* `command_len + 1' because `command_len' does not include the
 419          * trailing null byte. Neither does `send_buffer_fill'. */
 420         memcpy (cb->send_buffer + cb->send_buffer_fill,
 421                         command, command_len + 1);
 422         cb->send_buffer_fill += command_len;
 423         cb->send_buffer_free -= command_len;
 424
 425         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%) \"%s\"",
 426                         cb->location,
 427                         cb->send_buffer_fill, cb->send_buffer_size,
 428                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size),
 429                         command);
 430
 431         /* Check if we have enough space for this command. */
 432         pthread_mutex_unlock (&cb->send_lock);
 433
 434         return (0);
 435 } /* }}} int wh_write_command */
 436
 437 static int wh_write_json (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 438                 wh_callback_t *cb)
 439 {
 440         int status;
 441
 442         pthread_mutex_lock (&cb->send_lock);
 443
 444         if (cb->curl == NULL)
 445         {
 446                 status = wh_callback_init (cb);
 447                 if (status != 0)
 448                 {
 449                         ERROR ("write_http plugin: wh_callback_init failed.");
 450                         pthread_mutex_unlock (&cb->send_lock);
 451                         return (-1);
 452                 }
 453         }
 454
 455         status = format_json_value_list (cb->send_buffer,
 456                         &cb->send_buffer_fill,
 457                         &cb->send_buffer_free,
 458                         ds, vl, cb->store_rates);
 459         if (status == (-ENOMEM))
 460         {
 461                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 462                 if (status != 0)
 463                 {
 464                         wh_reset_buffer (cb);
 465                         pthread_mutex_unlock (&cb->send_lock);
 466                         return (status);
 467                 }
 468
 469                 status = format_json_value_list (cb->send_buffer,
 470                                 &cb->send_buffer_fill,
 471                                 &cb->send_buffer_free,
 472                                 ds, vl, cb->store_rates);
 473         }
 474         if (status != 0)
 475         {
 476                 pthread_mutex_unlock (&cb->send_lock);
 477                 return (status);
 478         }
 479
 480         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%)",
 481                         cb->location,
 482                         cb->send_buffer_fill, cb->send_buffer_size,
 483                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size));
 484
 485         /* Check if we have enough space for this command. */
 486         pthread_mutex_unlock (&cb->send_lock);
 487
 488         return (0);
 489 } /* }}} int wh_write_json */
 490
 491 static int wh_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 492                 user_data_t *user_data)
 493 {
 494         wh_callback_t *cb;
 495         int status;
 496
 497         if (user_data == NULL)
 498                 return (-EINVAL);
 499
 500         cb = user_data->data;
 501
 502         if (cb->format == WH_FORMAT_JSON)
 503                 status = wh_write_json (ds, vl, cb);
 504         else
 505                 status = wh_write_command (ds, vl, cb);
 506
 507         return (status);
 508 } /* }}} int wh_write */
 509
 510 static int config_set_format (wh_callback_t *cb, /* {{{ */
 511                 oconfig_item_t *ci)
 512 {
 513         char *string;
 514
 515         if ((ci->values_num != 1)
 516                         || (ci->values[0].type != OCONFIG_TYPE_STRING))
 517         {
 518                 WARNING ("write_http plugin: The `%s' config option "
 519                                 "needs exactly one string argument.", ci->key);
 520                 return (-1);
 521         }
 522
 523         string = ci->values[0].value.string;
 524         if (strcasecmp ("Command", string) == 0)
 525                 cb->format = WH_FORMAT_COMMAND;
 526         else if (strcasecmp ("JSON", string) == 0)
 527                 cb->format = WH_FORMAT_JSON;
 528         else
 529         {
 530                 ERROR ("write_http plugin: Invalid format string: %s",
 531                                 string);
 532                 return (-1);
 533         }
 534
 535         return (0);
 536 } /* }}} int config_set_format */
 537
 538 static int wh_config_append_string (const char *name, struct curl_slist **dest, /* {{{ */
 539     oconfig_item_t *ci)
 540 {
 541   struct curl_slist *temp = NULL;
 542   if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
 543   {
 544     WARNING ("write_http plugin: `%s' needs exactly one string argument.", name);
 545     return (-1);
 546   }
 547
 548   temp = curl_slist_append(*dest, ci->values[0].value.string);
 549   if (temp == NULL)
 550     return (-1);
 551
 552   *dest = temp;
 553
 554   return (0);
 555 } /* }}} int wh_config_append_string */
 556
 557 static int wh_config_node (oconfig_item_t *ci) /* {{{ */
 558 {
 559         wh_callback_t *cb;
 560         int buffer_size = 0;
 561         user_data_t user_data;
 562         char callback_name[DATA_MAX_NAME_LEN];
 563         int status = 0;
 564         int i;
 565
 566         cb = calloc (1, sizeof (*cb));
 567         if (cb == NULL)
 568         {
 569                 ERROR ("write_http plugin: calloc failed.");
 570                 return (-1);
 571         }
 572         cb->verify_peer = 1;
 573         cb->verify_host = 1;
 574         cb->format = WH_FORMAT_COMMAND;
 575         cb->sslversion = CURL_SSLVERSION_DEFAULT;
 576         cb->low_speed_limit = 0;
 577         cb->timeout = 0;
 578         cb->log_http_error = 0;
 579         cb->headers = NULL;
 580
 581
 582         pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
 583
 584         cf_util_get_string (ci, &cb->name);
 585
 586         /* FIXME: Remove this legacy mode in version 6. */
 587         if (strcasecmp ("URL", ci->key) == 0)
 588                 cf_util_get_string (ci, &cb->location);
 589
 590         for (i = 0; i < ci->children_num; i++)
 591         {
 592                 oconfig_item_t *child = ci->children + i;
 593
 594                 if (strcasecmp ("URL", child->key) == 0)
 595                         status = cf_util_get_string (child, &cb->location);
 596                 else if (strcasecmp ("User", child->key) == 0)
 597                         status = cf_util_get_string (child, &cb->user);
 598                 else if (strcasecmp ("Password", child->key) == 0)
 599                         status = cf_util_get_string (child, &cb->pass);
 600                 else if (strcasecmp ("VerifyPeer", child->key) == 0)
 601                         status = cf_util_get_boolean (child, &cb->verify_peer);
 602                 else if (strcasecmp ("VerifyHost", child->key) == 0)
 603                         status = cf_util_get_boolean (child, &cb->verify_host);
 604                 else if (strcasecmp ("CACert", child->key) == 0)
 605                         status = cf_util_get_string (child, &cb->cacert);
 606                 else if (strcasecmp ("CAPath", child->key) == 0)
 607                         status = cf_util_get_string (child, &cb->capath);
 608                 else if (strcasecmp ("ClientKey", child->key) == 0)
 609                         status = cf_util_get_string (child, &cb->clientkey);
 610                 else if (strcasecmp ("ClientCert", child->key) == 0)
 611                         status = cf_util_get_string (child, &cb->clientcert);
 612                 else if (strcasecmp ("ClientKeyPass", child->key) == 0)
 613                         status = cf_util_get_string (child, &cb->clientkeypass);
 614                 else if (strcasecmp ("SSLVersion", child->key) == 0)
 615                 {
 616                         char *value = NULL;
 617
 618                         status = cf_util_get_string (child, &value);
 619                         if (status != 0)
 620                                 break;
 621
 622                         if (value == NULL || strcasecmp ("default", value) == 0)
 623                                 cb->sslversion = CURL_SSLVERSION_DEFAULT;
 624                         else if (strcasecmp ("SSLv2", value) == 0)
 625                                 cb->sslversion = CURL_SSLVERSION_SSLv2;
 626                         else if (strcasecmp ("SSLv3", value) == 0)
 627                                 cb->sslversion = CURL_SSLVERSION_SSLv3;
 628                         else if (strcasecmp ("TLSv1", value) == 0)
 629                                 cb->sslversion = CURL_SSLVERSION_TLSv1;
 630 #if (LIBCURL_VERSION_MAJOR > 7) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR >= 34)
 631                         else if (strcasecmp ("TLSv1_0", value) == 0)
 632                                 cb->sslversion = CURL_SSLVERSION_TLSv1_0;
 633                         else if (strcasecmp ("TLSv1_1", value) == 0)
 634                                 cb->sslversion = CURL_SSLVERSION_TLSv1_1;
 635                         else if (strcasecmp ("TLSv1_2", value) == 0)
 636                                 cb->sslversion = CURL_SSLVERSION_TLSv1_2;
 637 #endif
 638                         else
 639                         {
 640                                 ERROR ("write_http plugin: Invalid SSLVersion "
 641                                                 "option: %s.", value);
 642                                 status = EINVAL;
 643                         }
 644
 645                         sfree(value);
 646                 }
 647                 else if (strcasecmp ("Format", child->key) == 0)
 648                         status = config_set_format (cb, child);
 649                 else if (strcasecmp ("StoreRates", child->key) == 0)
 650                         status = cf_util_get_boolean (child, &cb->store_rates);
 651                 else if (strcasecmp ("BufferSize", child->key) == 0)
 652                         status = cf_util_get_int (child, &buffer_size);
 653                 else if (strcasecmp ("LowSpeedLimit", child->key) == 0)
 654                         status = cf_util_get_int (child, &cb->low_speed_limit);
 655                 else if (strcasecmp ("Timeout", child->key) == 0)
 656                         status = cf_util_get_int (child, &cb->timeout);
 657                 else if (strcasecmp ("LogHttpError", child->key) == 0)
 658                         status = cf_util_get_boolean (child, &cb->log_http_error);
 659                 else if (strcasecmp ("Header", child->key) == 0)
 660                         status = wh_config_append_string ("Header", &cb->headers, child);
 661                 else
 662                 {
 663                         ERROR ("write_http plugin: Invalid configuration "
 664                                         "option: %s.", child->key);
 665                         status = EINVAL;
 666                 }
 667
 668                 if (status != 0)
 669                         break;
 670         }
 671
 672         if (status != 0)
 673         {
 674                 wh_callback_free (cb);
 675                 return (status);
 676         }
 677
 678         if (cb->location == NULL)
 679         {
 680                 ERROR ("write_http plugin: no URL defined for instance '%s'",
 681                         cb->name);
 682                 wh_callback_free (cb);
 683                 return (-1);
 684         }
 685
 686         if (cb->low_speed_limit > 0)
 687                 cb->low_speed_time = CDTIME_T_TO_TIME_T(plugin_get_interval());
 688
 689         /* Determine send_buffer_size. */
 690         cb->send_buffer_size = WRITE_HTTP_DEFAULT_BUFFER_SIZE;
 691         if (buffer_size >= 1024)
 692                 cb->send_buffer_size = (size_t) buffer_size;
 693         else if (buffer_size != 0)
 694                 ERROR ("write_http plugin: Ignoring invalid BufferSize setting (%d).",
 695                                 buffer_size);
 696
 697         /* Allocate the buffer. */
 698         cb->send_buffer = malloc (cb->send_buffer_size);
 699         if (cb->send_buffer == NULL)
 700         {
 701                 ERROR ("write_http plugin: malloc(%zu) failed.", cb->send_buffer_size);
 702                 wh_callback_free (cb);
 703                 return (-1);
 704         }
 705         /* Nulls the buffer and sets ..._free and ..._fill. */
 706         wh_reset_buffer (cb);
 707
 708         ssnprintf (callback_name, sizeof (callback_name), "write_http/%s",
 709                         cb->name);
 710         DEBUG ("write_http: Registering write callback '%s' with URL '%s'",
 711                         callback_name, cb->location);
 712
 713         memset (&user_data, 0, sizeof (user_data));
 714         user_data.data = cb;
 715         user_data.free_func = NULL;
 716         plugin_register_flush (callback_name, wh_flush, &user_data);
 717
 718         user_data.free_func = wh_callback_free;
 719         plugin_register_write (callback_name, wh_write, &user_data);
 720
 721         return (0);
 722 } /* }}} int wh_config_node */
 723
 724 static int wh_config (oconfig_item_t *ci) /* {{{ */
 725 {
 726         int i;
 727
 728         for (i = 0; i < ci->children_num; i++)
 729         {
 730                 oconfig_item_t *child = ci->children + i;
 731
 732                 if (strcasecmp ("Node", child->key) == 0)
 733                         wh_config_node (child);
 734                 /* FIXME: Remove this legacy mode in version 6. */
 735                 else if (strcasecmp ("URL", child->key) == 0) {
 736                         WARNING ("write_http plugin: Legacy <URL> block found. "
 737                                 "Please use <Node> instead.");
 738                         wh_config_node (child);
 739                 }
 740                 else
 741                 {
 742                         ERROR ("write_http plugin: Invalid configuration "
 743                                         "option: %s.", child->key);
 744                 }
 745         }
 746
 747         return (0);
 748 } /* }}} int wh_config */
 749
 750 static int wh_init (void) /* {{{ */
 751 {
 752         /* Call this while collectd is still single-threaded to avoid
 753          * initialization issues in libgcrypt. */
 754         curl_global_init (CURL_GLOBAL_SSL);
 755         return (0);
 756 } /* }}} int wh_init */
 757
 758 void module_register (void) /* {{{ */
 759 {
 760         plugin_register_complex_config ("write_http", wh_config);
 761         plugin_register_init ("write_http", wh_init);
 762 } /* }}} void module_register */
 763
 764 /* vim: set fdm=marker sw=8 ts=8 tw=78 et : */