Line data    Source code

       1             : /*
       2             :  * License:
       3             :  *    Copyright (c) 2013-2019  Made to Order Software Corp.  All Rights Reserved
       4             :  *
       5             :  *    https://snapwebsites.org/
       6             :  *    contact@m2osw.com
       7             :  *
       8             :  *    This program is free software; you can redistribute it and/or modify
       9             :  *    it under the terms of the GNU General Public License as published by
      10             :  *    the Free Software Foundation; either version 2 of the License, or
      11             :  *    (at your option) any later version.
      12             :  *
      13             :  *    This program is distributed in the hope that it will be useful,
      14             :  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      16             :  *    GNU General Public License for more details.
      17             :  *
      18             :  *    You should have received a copy of the GNU General Public License along
      19             :  *    with this program; if not, write to the Free Software Foundation, Inc.,
      20             :  *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
      21             :  *
      22             :  * Authors:
      23             :  *    Alexis Wilke   alexis@m2osw.com
      24             :  */
      25             : 
      26             : /** \file
      27             :  * \brief Implementation of the environment variable support.
      28             :  *
      29             :  * This file implements a variable which retrieves its value from the
      30             :  * process environment. For example, you could retrieve the path to
      31             :  * the HOME directory.
      32             :  *
      33             :  * This is often used to distinguish between runs.
      34             :  */
      35             : 
      36             : // self
      37             : //
      38             : #include    "snaplogger/exception.h"
      39             : #include    "snaplogger/variable.h"
      40             : 
      41             : 
      42             : // last include
      43             : //
      44             : #include    <snapdev/poison.h>
      45             : 
      46             : 
      47             : 
      48             : namespace snaplogger
      49             : {
      50             : 
      51             : 
      52             : namespace
      53             : {
      54             : 
      55             : 
      56           8 : DEFINE_LOGGER_VARIABLE(env)
      57             : {
      58           0 :     auto params(get_params());
      59           0 :     if(params.empty())
      60             :     {
      61           0 :         throw invalid_variable("the ${env:...} variable must have a \"name\" parameter.");
      62             :     }
      63           0 :     if(params[0]->get_name() != "name")
      64             :     {
      65           0 :         throw invalid_variable("the ${env:...} variable first parameter must be its \"name\" parameter.");
      66             :     }
      67           0 :     std::string const env_name(params[0]->get_value());
      68           0 :     if(env_name.empty())
      69             :     {
      70           0 :         throw invalid_variable("the ${env:name=...} variable first parameter cannot be empty.");
      71             :     }
      72           0 :     char const * env(getenv(env_name.c_str()));
      73           0 :     if(env != nullptr)
      74             :     {
      75           0 :         value += env;
      76             :     }
      77             : 
      78           0 :     variable::process_value(msg, value);
      79           0 : }
      80             : 
      81             : 
      82             : }
      83             : // no name namespace
      84             : 
      85             : 
      86           6 : } // snaplogger namespace
      87             : // vim: ts=4 sw=4 et