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         gauge_t *rates = NULL;
 113
 114         assert (0 == strcmp (ds->type, vl->type));
 115
 116         memset (buffer, '\0', buffer_len);
 117
 118         for (i = 0; i < ds->ds_num; i++)
 119         {
 120                 if ((ds->ds[i].type != DS_TYPE_COUNTER)
 121                                 && (ds->ds[i].type != DS_TYPE_GAUGE)
 122                                 && (ds->ds[i].type != DS_TYPE_DERIVE)
 123                                 && (ds->ds[i].type != DS_TYPE_ABSOLUTE))
 124                         return (-1);
 125
 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                 {
 133                         if (rates == NULL)
 134                                 rates = uc_get_rate (ds, vl);
 135                         if (rates == NULL)
 136                         {
 137                                 WARNING ("csv plugin: "
 138                                                 "uc_get_rate failed.");
 139                                 return (-1);
 140                         }
 141                         status = ssnprintf (buffer + offset,
 142                                         buffer_len - offset,
 143                                         ":%lf", rates[i]);
 144                 }
 145                 else if (ds->ds[i].type == DS_TYPE_DERIVE)
 146                 {
 147                         status = ssnprintf (buffer + offset,
 148                                         buffer_len - offset,
 149                                         ":%"PRIi64,
 150                                         vl->values[i].derive);
 151                 }
 152                 else if (ds->ds[i].type == DS_TYPE_ABSOLUTE)
 153                 {
 154                         status = ssnprintf (buffer + offset,
 155                                         buffer_len - offset,
 156                                         ":%"PRIu64,
 157                                         vl->values[i].absolute);
 158                 }
 159
 160                 if ((status < 1) || (status >= (buffer_len - offset)))
 161                 {
 162                         sfree (rates);
 163                         return (-1);
 164                 }
 165
 166                 offset += status;
 167         } /* for ds->ds_num */
 168
 169         sfree (rates);
 170         return (0);
 171 } /* }}} int http_value_list_to_string */
 172
 173 static int http_config (const char *key, const char *value) /* {{{ */
 174 {
 175         if (strcasecmp ("URL", key) == 0)
 176         {
 177                 if (location != NULL)
 178                         free (location);
 179                 location = strdup (value);
 180                 if (location != NULL)
 181                 {
 182                         int len = strlen (location);
 183                         while ((len > 0) && (location[len - 1] == '/'))
 184                         {
 185                                 len--;
 186                                 location[len] = '\0';
 187                         }
 188                         if (len <= 0)
 189                         {
 190                                 free (location);
 191                                 location = NULL;
 192                         }
 193                 }
 194         }
 195         else if (strcasecmp ("User", key) == 0)
 196         {
 197                 if (user != NULL)
 198                         free (user);
 199                 user = strdup (value);
 200                 if (user != NULL)
 201                 {
 202                         int len = strlen (user);
 203                         while ((len > 0) && (user[len - 1] == '/'))
 204                         {
 205                                 len--;
 206                                 user[len] = '\0';
 207                         }
 208                         if (len <= 0)
 209                         {
 210                                 free (user);
 211                                 user = NULL;
 212                         }
 213                 }
 214         }
 215         else if (strcasecmp ("Password", key) == 0)
 216         {
 217                 if (pass != NULL)
 218                         free (pass);
 219                 pass = strdup (value);
 220                 if (pass != NULL)
 221                 {
 222                         int len = strlen (pass);
 223                         while ((len > 0) && (pass[len - 1] == '/'))
 224                         {
 225                                 len--;
 226                                 pass[len] = '\0';
 227                         }
 228                         if (len <= 0)
 229                         {
 230                                 free (pass);
 231                                 pass = NULL;
 232                         }
 233                 }
 234         }
 235         else
 236         {
 237                 return (-1);
 238         }
 239         return (0);
 240 } /* }}} int http_config */
 241
 242 static void http_init_buffer (void)  /* {{{ */
 243 {
 244         memset (send_buffer, 0, sizeof (send_buffer));
 245         send_buffer_fill = 0;
 246 } /* }}} http_init_buffer */
 247
 248 static int http_send_buffer (char *buffer) /* {{{ */
 249 {
 250         int status = 0;
 251         curl_easy_setopt (curl, CURLOPT_POSTFIELDS, buffer);
 252         //status = curl_easy_perform (curl);
 253         if (status != 0)
 254         {
 255                 ERROR ("http plugin: curl_easy_perform failed with staus %i: %s",
 256                                 status, curl_errbuf);
 257         }
 258         return (status);
 259 } /* }}} http_send_buffer */
 260
 261 static int http_flush_buffer (void) /* {{{ */
 262 {
 263         int status = 0;
 264         DEBUG ("http plugin: flushing buffer:\n%s", send_buffer);
 265
 266         status = http_send_buffer (send_buffer);
 267         http_init_buffer ();
 268
 269         return (status);
 270 } /* }}} http_flush_buffer */
 271
 272 static int http_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 273                 user_data_t __attribute__((unused)) *user_data)
 274 {
 275
 276         char key[1024];
 277         char values[512];
 278
 279         int status;
 280
 281         if (0 != strcmp (ds->type, vl->type)) {
 282                 ERROR ("http plugin: DS type does not match value list type");
 283                 return -1;
 284         }
 285
 286         status = format_name( key, sizeof(key), vl->host, vl->plugin,
 287                         vl->plugin_instance, vl->type, vl->type_instance );
 288
 289         if (status != 0) {
 290                 ERROR ("http plugin: error with format_name");
 291                 return (status);
 292         }
 293
 294         status = http_value_list_to_string (values, sizeof (values), ds, vl);
 295
 296         if (status != 0) {
 297                 ERROR ("http plugin: error with http_value_list_to_string");
 298                 return (status);
 299         }
 300
 301
 302         pthread_mutex_lock (&send_lock);
 303
 304         status = ssnprintf (send_buffer + send_buffer_fill, sizeof (send_buffer) - send_buffer_fill,
 305                         "PUTVAL %s interval=%i %u%s\n",
 306                         key, interval_g, vl->time, values);
 307         send_buffer_fill += status;
 308
 309         if ((sizeof (send_buffer) - send_buffer_fill) < (sizeof(key) + sizeof(values)))
 310         {
 311                 status = http_flush_buffer();
 312                 if (status != 0)
 313                         return status;
 314
 315         }
 316
 317         pthread_mutex_unlock (&send_lock);
 318
 319
 320         return (0);
 321
 322 } /* }}} int http_write */
 323
 324 static int http_shutdown (void) /* {{{ */
 325 {
 326         http_flush_buffer();
 327         curl_easy_cleanup(curl);
 328         return (0);
 329 }
 330
 331 void module_register (void) /* {{{ */
 332 {
 333         plugin_register_init("http", http_init);
 334         plugin_register_config ("http", http_config,
 335                         config_keys, config_keys_num);
 336         plugin_register_write ("http", http_write, /* user_data = */ NULL);
 337         plugin_register_shutdown("http", http_shutdown);
 338 } /* }}} void module_register */
 339
 340 /* vim: set fdm=marker sw=8 ts=8 tw=78 : */