Line data    Source code

       1             : // Copyright (c) 2013-2021  Made to Order Software Corp.  All Rights Reserved
       2             : //
       3             : // https://snapwebsites.org/project/snaplogger
       4             : // contact@m2osw.com
       5             : //
       6             : // This program is free software; you can redistribute it and/or modify
       7             : // it under the terms of the GNU General Public License as published by
       8             : // the Free Software Foundation; either version 2 of the License, or
       9             : // (at your option) any later version.
      10             : //
      11             : // This program is distributed in the hope that it will be useful,
      12             : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14             : // GNU 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
      19             : 
      20             : /** \file
      21             :  * \brief Implementation of the environment variable support.
      22             :  *
      23             :  * This file implements a variable which retrieves its value from the
      24             :  * process environment. For example, you could retrieve the path to
      25             :  * the HOME directory.
      26             :  *
      27             :  * This is often used to distinguish between runs.
      28             :  */
      29             : 
      30             : // self
      31             : //
      32             : #include    "snaplogger/exception.h"
      33             : #include    "snaplogger/variable.h"
      34             : 
      35             : 
      36             : // last include
      37             : //
      38             : #include    <snapdev/poison.h>
      39             : 
      40             : 
      41             : 
      42             : namespace snaplogger
      43             : {
      44             : 
      45             : 
      46             : namespace
      47             : {
      48             : 
      49             : 
      50           8 : DEFINE_LOGGER_VARIABLE(env)
      51             : {
      52           0 :     auto params(get_params());
      53           0 :     if(params.empty())
      54             :     {
      55           0 :         throw invalid_variable("the ${env:...} variable must have a \"name\" parameter.");
      56             :     }
      57           0 :     if(params[0]->get_name() != "name")
      58             :     {
      59           0 :         throw invalid_variable("the ${env:...} variable first parameter must be its \"name\" parameter.");
      60             :     }
      61           0 :     std::string const env_name(params[0]->get_value());
      62           0 :     if(env_name.empty())
      63             :     {
      64           0 :         throw invalid_variable("the ${env:name=...} variable first parameter cannot be empty.");
      65             :     }
      66           0 :     char const * env(getenv(env_name.c_str()));
      67           0 :     if(env != nullptr)
      68             :     {
      69           0 :         value += env;
      70             :     }
      71             : 
      72           0 :     variable::process_value(msg, value);
      73           0 : }
      74             : 
      75             : 
      76             : }
      77             : // no name namespace
      78             : 
      79             : 
      80           6 : } // snaplogger namespace
      81             : // vim: ts=4 sw=4 et