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         "URL", "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 int    send_buffer_fill;
  57
  58 static pthread_mutex_t  send_lock = PTHREAD_MUTEX_INITIALIZER;
  59
  60 static int http_init(void) /* {{{ */
  61 {
  62
  63         curl = curl_easy_init ();
  64
  65         if (curl == NULL)
  66         {
  67                 ERROR ("curl plugin: curl_easy_init failed.");
  68                 return (-1);
  69         }
  70
  71         struct curl_slist *headers=NULL;
  72
  73         curl_easy_setopt (curl, CURLOPT_USERAGENT, PACKAGE_NAME"/"PACKAGE_VERSION);
  74
  75         headers = curl_slist_append(headers, "Accept:  */*");
  76         headers = curl_slist_append(headers, "Content-Type: text/plain");
  77         curl_easy_setopt (curl, CURLOPT_HTTPHEADER, headers);
  78
  79         curl_easy_setopt (curl, CURLOPT_ERRORBUFFER, curl_errbuf);
  80         curl_easy_setopt (curl, CURLOPT_URL, location);
  81
  82         if (user != NULL)
  83         {
  84                 size_t credentials_size;
  85
  86                 credentials_size = strlen (user) + 2;
  87                 if (pass != NULL)
  88                         credentials_size += strlen (pass);
  89
  90                 credentials = (char *) malloc (credentials_size);
  91                 if (credentials == NULL)
  92                 {
  93                         ERROR ("curl plugin: malloc failed.");
  94                         return (-1);
  95                 }
  96
  97                 ssnprintf (credentials, credentials_size, "%s:%s",
  98                                 user, (pass == NULL) ? "" : pass);
  99                 curl_easy_setopt (curl, CURLOPT_USERPWD, credentials);
 100                 curl_easy_setopt (curl, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST);
 101         }
 102
 103         return (0);
 104 } /* }}} */
 105
 106 static int http_value_list_to_string (char *buffer, int buffer_len, /* {{{ */
 107                 const data_set_t *ds, const value_list_t *vl)
 108 {
 109         int offset = 0;
 110         int status;
 111         int i;
 112
 113         assert (0 == strcmp (ds->type, vl->type));
 114
 115         memset (buffer, '\0', buffer_len);
 116
 117         for (i = 0; i < ds->ds_num; i++)
 118         {
 119                 if ((ds->ds[i].type != DS_TYPE_COUNTER)
 120                                 && (ds->ds[i].type != DS_TYPE_GAUGE)
 121                                 && (ds->ds[i].type != DS_TYPE_DERIVE)
 122                                 && (ds->ds[i].type != DS_TYPE_ABSOLUTE))
 123                         return (-1);
 124
 125                 status = -1;
 126                 if (ds->ds[i].type == DS_TYPE_GAUGE)
 127                 {
 128                         status = ssnprintf (buffer + offset, buffer_len - offset,
 129                                         ":%lf", vl->values[i].gauge);
 130                 }
 131                 else if ((ds->ds[i].type == DS_TYPE_COUNTER)
 132                                 || (ds->ds[i].type == DS_TYPE_ABSOLUTE))
 133                 {
 134                         status = ssnprintf (buffer + offset,
 135                                         buffer_len - offset,
 136                                         ":%"PRIu64,
 137                                         (ds->ds[i].type == DS_TYPE_COUNTER)
 138                                         ? vl->values[i].counter
 139                                         : vl->values[i].absolute);
 140                 }
 141                 else if (ds->ds[i].type == DS_TYPE_DERIVE)
 142                 {
 143                         status = ssnprintf (buffer + offset,
 144                                         buffer_len - offset,
 145                                         ":%"PRIi64,
 146                                         vl->values[i].derive);
 147                 }
 148
 149                 if ((status < 1) || (status >= (buffer_len - offset)))
 150                         return (-1);
 151
 152                 offset += status;
 153         } /* for ds->ds_num */
 154
 155         return (0);
 156 } /* }}} int http_value_list_to_string */
 157
 158 static int http_config (const char *key, const char *value) /* {{{ */
 159 {
 160         if (strcasecmp ("URL", key) == 0)
 161         {
 162                 if (location != NULL)
 163                         free (location);
 164                 location = strdup (value);
 165                 if (location != NULL)
 166                 {
 167                         int len = strlen (location);
 168                         while ((len > 0) && (location[len - 1] == '/'))
 169                         {
 170                                 len--;
 171                                 location[len] = '\0';
 172                         }
 173                         if (len <= 0)
 174                         {
 175                                 free (location);
 176                                 location = NULL;
 177                         }
 178                 }
 179         }
 180         else if (strcasecmp ("User", key) == 0)
 181         {
 182                 if (user != NULL)
 183                         free (user);
 184                 user = strdup (value);
 185                 if (user != NULL)
 186                 {
 187                         int len = strlen (user);
 188                         while ((len > 0) && (user[len - 1] == '/'))
 189                         {
 190                                 len--;
 191                                 user[len] = '\0';
 192                         }
 193                         if (len <= 0)
 194                         {
 195                                 free (user);
 196                                 user = NULL;
 197                         }
 198                 }
 199         }
 200         else if (strcasecmp ("Password", key) == 0)
 201         {
 202                 if (pass != NULL)
 203                         free (pass);
 204                 pass = strdup (value);
 205                 if (pass != NULL)
 206                 {
 207                         int len = strlen (pass);
 208                         while ((len > 0) && (pass[len - 1] == '/'))
 209                         {
 210                                 len--;
 211                                 pass[len] = '\0';
 212                         }
 213                         if (len <= 0)
 214                         {
 215                                 free (pass);
 216                                 pass = NULL;
 217                         }
 218                 }
 219         }
 220         else
 221         {
 222                 return (-1);
 223         }
 224         return (0);
 225 } /* }}} int http_config */
 226
 227 static void http_init_buffer (void)  /* {{{ */
 228 {
 229         memset (send_buffer, 0, sizeof (send_buffer));
 230         send_buffer_fill = 0;
 231 } /* }}} http_init_buffer */
 232
 233 static int http_send_buffer (char *buffer) /* {{{ */
 234 {
 235         int status = 0;
 236         curl_easy_setopt (curl, CURLOPT_POSTFIELDS, buffer);
 237         //status = curl_easy_perform (curl);
 238         if (status != 0)
 239         {
 240                 ERROR ("http plugin: curl_easy_perform failed with staus %i: %s",
 241                                 status, curl_errbuf);
 242         }
 243         return (status);
 244 } /* }}} http_send_buffer */
 245
 246 static int http_flush_buffer (void) /* {{{ */
 247 {
 248         int status = 0;
 249         DEBUG ("http plugin: flushing buffer:\n%s", send_buffer);
 250
 251         status = http_send_buffer (send_buffer);
 252         http_init_buffer ();
 253
 254         return (status);
 255 } /* }}} http_flush_buffer */
 256
 257 static int http_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 258                 user_data_t __attribute__((unused)) *user_data)
 259 {
 260         char key[1024];
 261         char values[512];
 262
 263         int status;
 264
 265         if (0 != strcmp (ds->type, vl->type)) {
 266                 ERROR ("http plugin: DS type does not match value list type");
 267                 return -1;
 268         }
 269
 270         status = FORMAT_VL (key, sizeof (key), vl);
 271         if (status != 0) {
 272                 ERROR ("http plugin: error with format_name");
 273                 return (status);
 274         }
 275
 276         status = http_value_list_to_string (values, sizeof (values), ds, vl);
 277         if (status != 0) {
 278                 ERROR ("http plugin: error with http_value_list_to_string");
 279                 return (status);
 280         }
 281
 282
 283         pthread_mutex_lock (&send_lock);
 284
 285         /* `values' has a leading `:'. */
 286         status = ssnprintf (send_buffer + send_buffer_fill,
 287                         sizeof (send_buffer) - send_buffer_fill,
 288                         "PUTVAL %s interval=%i %lu%s\n",
 289                         key, interval_g, (unsigned long) vl->time, values);
 290         send_buffer_fill += status;
 291
 292         if ((sizeof (send_buffer) - send_buffer_fill) < (sizeof(key) + sizeof(values)))
 293         {
 294                 status = http_flush_buffer();
 295                 if (status != 0)
 296                         return status;
 297
 298         }
 299
 300         pthread_mutex_unlock (&send_lock);
 301
 302
 303         return (0);
 304
 305 } /* }}} int http_write */
 306
 307 static int http_shutdown (void) /* {{{ */
 308 {
 309         http_flush_buffer();
 310         curl_easy_cleanup(curl);
 311         return (0);
 312 }
 313
 314 void module_register (void) /* {{{ */
 315 {
 316         plugin_register_init("http", http_init);
 317         plugin_register_config ("http", http_config,
 318                         config_keys, config_keys_num);
 319         plugin_register_write ("http", http_write, /* user_data = */ NULL);
 320         plugin_register_shutdown("http", http_shutdown);
 321 } /* }}} void module_register */
 322
 323 /* vim: set fdm=marker sw=8 ts=8 tw=78 : */