NAME Config::Environment - Application Configuration via Environment Variables VERSION version 0.000002 SYNOPSIS use Config::Environment; my $conf = Config::Environment->new('myapp'); my $conn = $conf->param('db.1.conn' => 'dbi:mysql:dbname=foobar'); my $user = $conf->param('db.1.user'); # via $ENV{MYAPP_DB_1_USER} or undef my $pass = $conf->param('db.1.pass'); # via $ENV{MYAPP_DB_1_PASS} or undef or my $info = $conf->param('db.1'); say $info->{conn}; # outputs dbi:mysql:dbname=foobar say $info->{user}; # outputs the value of $ENV{MYAPP_DB_1_USER} say $info->{pass}; # outputs the value of $ENV{MYAPP_DB_1_PASS} likewise ... $conf->param('server' => {node => ['10.10.10.02', '10.10.10.03']}); creates the following environment variables and assignments $ENV{MYAPP_SERVER_NODE_1} = '10.10.10.02'; $ENV{MYAPP_SERVER_NODE_2} = '10.10.10.03'; ... and the configuration can be retrieved using any of the following $conf->param('server'); $conf->param('server.node'); $conf->param('server.node.1'); $conf->param('server.node.2'); or my ($node1, $node2) = $conf->params(qw(server.node.1 server.node.2)); DESCRIPTION Config::Environment is an interface for managing application configuration using environment variables as a backend. Using environment variables as a means of application configuration is a great way of controlling which parts of your application configuration gets hard-coded and shipped with your codebase (and which parts do not). Using environment variables, application configuration can be set at the system, user, and/or application levels and easily overridden. ATTRIBUTES domain The domain attribute contains the environment variable prefix used as context to differentiate between other environment variables. METHODS load The load method expects a hashref which it parses and generates environment variables from whether the exist or not and registers the formatted environment structure. This method is called automatically on instantiation using the global ENV hash as an argument. $self->load($hash); param The param method expects a key which it uses to locate the corresponding environment variable in the registered data structure. The key uses dot-notation to traverse hierarchical data in the registry. This method will return undefined if no element can be found matching the query. The method can also be used to set environment variables by passing an additional argument as the value in the form of a scalar, arrayref or hashref. my $item = $self->param($key); my $item = $self->param($key => $value); params The params method expects a list of keys which are used to locate the corresponding environment variables in the registered data structure. The keys use dot-notation to traverse hierarchical data in the registry and return a list of corresponding values in order specified. This method returns a list in list-context, otherwise it returns the first element found of the list of queries specified. my $item = $self->params(@list_of_keys); my @items = $self->params(@list_of_keys); environment The environment method returns a hashref representing all environment variables specific to the instantiated object's domain and instance. my $environment = $self->environment; AUTHOR Al Newkirk COPYRIGHT AND LICENSE This software is copyright (c) 2013 by Al Newkirk. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.