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package Config::Layered::Source::ENV; |
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use warnings; |
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use strict; |
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use Storable qw( dclone ); |
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use base 'Config::Layered::Source'; |
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1207
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sub get_config { |
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my ( $self ) = @_; |
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my $struct = dclone($self->layered->default); |
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my $config = {}; |
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$self->args->{prefix} ||= "CONFIG"; |
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for my $key ( keys %{$struct} ) { |
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$config->{$key} = $ENV{ $self->args->{prefix} . "_" . uc($key) } |
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if exists $ENV{ $self->args->{prefix} . "_" . uc($key) }; |
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} |
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for my $key ( @{$self->args->{params}} ) { |
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$config->{$key} = $ENV{ $self->args->{prefix} . "_" . uc($key) } |
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if exists $ENV{ $self->args->{prefix} . "_" . uc($key) }; |
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} |
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return $config; |
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} |
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1; |
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=head1 NAME |
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Config::Layered::Source::ENV - The Environment Variable Source |
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=head1 DESCRIPTION |
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The ENV source provides configuration through environment variables. |
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For each top-level key in the default data structure, it checks for the |
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environment variable C where $KEY is the name of the key used |
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in the default data structure. |
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=head1 EXAMPLE |
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my $config = Config::Layered->load_config( |
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default => { |
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foo => "bar", |
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blee => "baz", |
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bax => { |
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chicken => "eggs", |
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} |
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} |
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); |
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With the above configuration, the following keys will be checked: |
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=over 4 |
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=item * CONFIG_FOO |
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=item * CONFIG_BLEE |
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=item * CONFIG_BAX |
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=back |
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The following would *NOT* be checked: |
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=over 4 |
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=item * CONFIG_CHICKEN |
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71
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=back |
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73
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Given the above default data structure, a command run as |
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C would result in a |
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C<$config> structure like this: |
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78
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{ |
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foo => "Hello World", |
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blee => "baz", |
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bax => { |
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chicken => "eggs", |
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} |
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85
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=head1 SOURCE ARGUMENTS |
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=over 4 |
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=item * params is an array ref of keys to check Default: Keys of the default |
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data structure. |
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92
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=item * prefix is a word prepended to your key that is used to check |
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C<$ENV{$prefix . "_" . uc($key) }>. |
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95
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=back |
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Example: |
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99
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Config::Layered->load_config( |
100
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sources => [ |
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'ENV' => { prefix => "MYAPP", params => [qw( bar blee )] } |
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], |
103
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default => { debug => 0, verbose => 1 }, |
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); |
105
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106
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The following keys would be checked: |
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108
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=over 4 |
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110
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=item * MYAPP_BAR |
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112
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=item * MYAPP_BLEE |
113
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114
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=item * MYAPP_DEBUG |
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116
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=item * MYAPP_VERBOSE |
117
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118
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=back |
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120
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=cut |