src/http.c

   1 /**
   2  * collectd - src/http.c
   3  * Copyright (C) 2007-2009  Florian octo Forster
   4  * Copyright (C) 2009       Doug MacEachern
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; only version 2 of the License is applicable.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  18  *
  19  * Authors:
  20  *   Florian octo Forster <octo at verplant.org>
  21  *   Doug MacEachern <dougm@hyperic.com>
  22  **/
  23
  24 #include "collectd.h"
  25 #include "plugin.h"
  26 #include "common.h"
  27 #include "utils_cache.h"
  28 #include "utils_parse_option.h"
  29
  30 #if HAVE_PTHREAD_H
  31 # include <pthread.h>
  32 #endif
  33
  34 #include <curl/curl.h>
  35
  36 /*
  37  * Private variables
  38  */
  39 static const char *config_keys[] =
  40 {
  41         "Location", "User", "Password"
  42 };
  43 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
  44
  45 static char *location   = NULL;
  46
  47 char *user;
  48 char *pass;
  49 char *credentials;
  50
  51 CURL *curl;
  52 char curl_errbuf[CURL_ERROR_SIZE];
  53
  54 #define SEND_BUFFER_SIZE 4096
  55 static char   send_buffer[SEND_BUFFER_SIZE];
  56 static char  *send_buffer_ptr;
  57 static int    send_buffer_fill;
  58
  59 static pthread_mutex_t  send_lock = PTHREAD_MUTEX_INITIALIZER;
  60
  61 static int http_init(void) /* {{{ */
  62 {
  63
  64         curl = curl_easy_init ();
  65
  66         if (curl == NULL)
  67         {
  68                 ERROR ("curl plugin: curl_easy_init failed.");
  69                 return (-1);
  70         }
  71
  72         struct curl_slist *headers=NULL;
  73
  74         curl_easy_setopt (curl, CURLOPT_USERAGENT, PACKAGE_NAME"/"PACKAGE_VERSION);
  75
  76         headers = curl_slist_append(headers, "Accept:  */*");
  77         headers = curl_slist_append(headers, "Content-Type: text/plain");
  78         curl_easy_setopt (curl, CURLOPT_HTTPHEADER, headers);
  79
  80         curl_easy_setopt (curl, CURLOPT_ERRORBUFFER, curl_errbuf);
  81         curl_easy_setopt (curl, CURLOPT_URL, location);
  82
  83         if (user != NULL)
  84         {
  85                 size_t credentials_size;
  86
  87                 credentials_size = strlen (user) + 2;
  88                 if (pass != NULL)
  89                         credentials_size += strlen (pass);
  90
  91                 credentials = (char *) malloc (credentials_size);
  92                 if (credentials == NULL)
  93                 {
  94                         ERROR ("curl plugin: malloc failed.");
  95                         return (-1);
  96                 }
  97
  98                 ssnprintf (credentials, credentials_size, "%s:%s",
  99                                 user, (pass == NULL) ? "" : pass);
 100                 curl_easy_setopt (curl, CURLOPT_USERPWD, credentials);
 101                 curl_easy_setopt (curl, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST);
 102         }
 103
 104         return (0);
 105 } /* }}} */
 106
 107 static int http_value_list_to_string (char *buffer, int buffer_len, /* {{{ */
 108                 const data_set_t *ds, const value_list_t *vl)
 109 {
 110         int offset = 0;
 111         int status;
 112         int i;
 113         gauge_t *rates = NULL;
 114
 115         assert (0 == strcmp (ds->type, vl->type));
 116
 117         memset (buffer, '\0', buffer_len);
 118
 119         for (i = 0; i < ds->ds_num; i++)
 120         {
 121                 if ((ds->ds[i].type != DS_TYPE_COUNTER)
 122                                 && (ds->ds[i].type != DS_TYPE_GAUGE)
 123                                 && (ds->ds[i].type != DS_TYPE_DERIVE)
 124                                 && (ds->ds[i].type != DS_TYPE_ABSOLUTE))
 125                         return (-1);
 126
 127                 if (ds->ds[i].type == DS_TYPE_GAUGE)
 128                 {
 129                         status = ssnprintf (buffer + offset, buffer_len - offset,
 130                                         ":%lf", vl->values[i].gauge);
 131                 }
 132                 else if (ds->ds[i].type == DS_TYPE_COUNTER)
 133                 {
 134                         if (rates == NULL)
 135                                 rates = uc_get_rate (ds, vl);
 136                         if (rates == NULL)
 137                         {
 138                                 WARNING ("csv plugin: "
 139                                                 "uc_get_rate failed.");
 140                                 return (-1);
 141                         }
 142                         status = ssnprintf (buffer + offset,
 143                                         buffer_len - offset,
 144                                         ":%lf", rates[i]);
 145                 }
 146                 else if (ds->ds[i].type == DS_TYPE_DERIVE)
 147                 {
 148                         status = ssnprintf (buffer + offset,
 149                                         buffer_len - offset,
 150                                         ":%"PRIi64,
 151                                         vl->values[i].derive);
 152                 }
 153                 else if (ds->ds[i].type == DS_TYPE_ABSOLUTE)
 154                 {
 155                         status = ssnprintf (buffer + offset,
 156                                         buffer_len - offset,
 157                                         ":%"PRIu64,
 158                                         vl->values[i].absolute);
 159                 }
 160
 161                 if ((status < 1) || (status >= (buffer_len - offset)))
 162                 {
 163                         sfree (rates);
 164                         return (-1);
 165                 }
 166
 167                 offset += status;
 168         } /* for ds->ds_num */
 169
 170         sfree (rates);
 171         return (0);
 172 } /* }}} int http_value_list_to_string */
 173
 174 static int http_config (const char *key, const char *value) /* {{{ */
 175 {
 176         if (strcasecmp ("Location", key) == 0)
 177         {
 178                 if (location != NULL)
 179                         free (location);
 180                 location = strdup (value);
 181                 if (location != NULL)
 182                 {
 183                         int len = strlen (location);
 184                         while ((len > 0) && (location[len - 1] == '/'))
 185                         {
 186                                 len--;
 187                                 location[len] = '\0';
 188                         }
 189                         if (len <= 0)
 190                         {
 191                                 free (location);
 192                                 location = NULL;
 193                         }
 194                 }
 195         }
 196         else if (strcasecmp ("User", key) == 0)
 197         {
 198                 if (user != NULL)
 199                         free (user);
 200                 user = strdup (value);
 201                 if (user != NULL)
 202                 {
 203                         int len = strlen (user);
 204                         while ((len > 0) && (user[len - 1] == '/'))
 205                         {
 206                                 len--;
 207                                 user[len] = '\0';
 208                         }
 209                         if (len <= 0)
 210                         {
 211                                 free (user);
 212                                 user = NULL;
 213                         }
 214                 }
 215         }
 216         else if (strcasecmp ("Password", key) == 0)
 217         {
 218                 if (pass != NULL)
 219                         free (pass);
 220                 pass = strdup (value);
 221                 if (pass != NULL)
 222                 {
 223                         int len = strlen (pass);
 224                         while ((len > 0) && (pass[len - 1] == '/'))
 225                         {
 226                                 len--;
 227                                 pass[len] = '\0';
 228                         }
 229                         if (len <= 0)
 230                         {
 231                                 free (pass);
 232                                 pass = NULL;
 233                         }
 234                 }
 235         }
 236         else
 237         {
 238                 return (-1);
 239         }
 240         return (0);
 241 } /* }}} int http_config */
 242
 243 static void http_init_buffer (void)  /* {{{ */
 244 {
 245         memset (send_buffer, 0, sizeof (send_buffer));
 246         send_buffer_ptr = send_buffer;
 247         send_buffer_fill = 0;
 248 } /* }}} http_init_buffer */
 249
 250 static int http_send_buffer (char *buffer) /* {{{ */
 251 {
 252         int status = 0;
 253         curl_easy_setopt (curl, CURLOPT_POSTFIELDS, buffer);
 254         //status = curl_easy_perform (curl);
 255         if (status != 0)
 256         {
 257                 ERROR ("http plugin: curl_easy_perform failed with staus %i: %s",
 258                                 status, curl_errbuf);
 259         }
 260         return (status);
 261 } /* }}} http_send_buffer */
 262
 263 static int http_flush_buffer (void) /* {{{ */
 264 {
 265         int status = 0;
 266         DEBUG ("http plugin: flushing buffer:\n%s", send_buffer);
 267
 268         status = http_send_buffer (send_buffer);
 269         http_init_buffer ();
 270
 271         return (status);
 272 } /* }}} http_flush_buffer */
 273
 274 static int http_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 275                 user_data_t __attribute__((unused)) *user_data)
 276 {
 277
 278         char key[1024];
 279         char values[512];
 280
 281         int status;
 282
 283         if (0 != strcmp (ds->type, vl->type)) {
 284                 ERROR ("http plugin: DS type does not match value list type");
 285                 return -1;
 286         }
 287
 288         status = format_name( key, sizeof(key), vl->host, vl->plugin,
 289                         vl->plugin_instance, vl->type, vl->type_instance );
 290
 291         if (status != 0) {
 292                 ERROR ("http plugin: error with format_name");
 293                 return (status);
 294         }
 295
 296         status = http_value_list_to_string (values, sizeof (values), ds, vl);
 297
 298         if (status != 0) {
 299                 ERROR ("http plugin: error with http_value_list_to_string");
 300                 return (status);
 301         }
 302
 303
 304         pthread_mutex_lock (&send_lock);
 305
 306         status = ssnprintf (send_buffer + send_buffer_fill, sizeof (send_buffer) - send_buffer_fill,
 307                         "PUTVAL %s interval=%i %u%s\n",
 308                         key, interval_g, vl->time, values);
 309         send_buffer_fill += status;
 310
 311         if ((sizeof (send_buffer) - send_buffer_fill) < (sizeof(key) + sizeof(values)))
 312         {
 313                 status = http_flush_buffer();
 314                 if (status != 0)
 315                         return status;
 316
 317         }
 318
 319         pthread_mutex_unlock (&send_lock);
 320
 321
 322         return (0);
 323
 324 } /* }}} int http_write */
 325
 326 static int http_shutdown (void) /* {{{ */
 327 {
 328         http_flush_buffer();
 329         curl_easy_cleanup(curl);
 330         return (0);
 331 }
 332
 333 void module_register (void) /* {{{ */
 334 {
 335         plugin_register_init("http", http_init);
 336         plugin_register_config ("http", http_config,
 337                         config_keys, config_keys_num);
 338         plugin_register_write ("http", http_write, /* user_data = */ NULL);
 339         plugin_register_shutdown("http", http_shutdown);
 340 } /* }}} void module_register */
 341
 342 /* vim: set fdm=marker sw=8 ts=8 tw=78 : */