1 package Catalyst::Plugin::ConfigLoader;
8 use Data::Visitor::Callback;
9 use Catalyst::Utils ();
11 our $VERSION = '0.16';
15 Catalyst::Plugin::ConfigLoader - Load config files of various types
21 # ConfigLoader should be first in your list so
22 # other plugins can get the config information
23 use Catalyst qw( ConfigLoader ... );
25 # by default myapp.* will be loaded
26 # you can specify a file if you'd like
27 __PACKAGE__->config( file => 'config.yaml' );
31 This module will attempt to load find and load a configuration
32 file of various types. Currently it supports YAML, JSON, XML,
35 To support the distinction between development and production environments,
36 this module will also attemp to load a local config (e.g. myapp_local.yaml)
37 which will override any duplicate settings.
43 This method is automatically called by Catalyst's setup routine. It will
44 attempt to use each plugin and, once a file has been successfully
45 loaded, set the C<config()> section.
51 my @files = $c->find_files;
52 my $cfg = Config::Any->load_files( {
54 filter => \&_fix_syntax,
58 # split the responses into normal and local cfg
59 my $local_suffix = $c->get_config_local_suffix;
60 my( @cfg, @localcfg );
62 if( ( keys %$_ )[ 0 ] =~ m{ $local_suffix \. }xms ) {
69 # load all the normal cfgs, then the local cfgs last so they can override
71 $c->load_config( $_ ) for @cfg, @localcfg;
74 $c->NEXT::setup( @_ );
79 This method handles loading the configuration data into the Catalyst
80 context object. It does not return a value.
88 my( $file, $config ) = each %$ref;
90 $c->config( $config );
91 $c->log->debug( qq(Loaded Config "$file") )
99 This method determines the potential file paths to be used for config loading.
100 It returns an array of paths (up to the filename less the extension) to pass to
101 L<Config::Any|Config::Any> for loading.
107 my( $path, $extension ) = $c->get_config_path;
108 my $suffix = $c->get_config_local_suffix;
109 my @extensions = @{ Config::Any->extensions };
113 next unless grep { $_ eq $extension } @extensions;
114 push @files, $path, "${path}_${suffix}";
116 @files = map { ( "$path.$_", "${path}_${suffix}.$_" ) } @extensions;
122 =head2 get_config_path
124 This method determines the path, filename prefix and file extension to be used
125 for config loading. It returns the path (up to the filename less the
126 extension) to check and the specific extension to use (if it was specified).
128 The order of preference is specified as:
132 =item * C<$ENV{ MYAPP_CONFIG }>
134 =item * C<$ENV{ CATALYST_CONFIG }>
136 =item * C<$c-E<gt>config-E<gt>{ file }>
138 =item * C<$c-E<gt>path_to( $application_prefix )>
142 If either of the first two user-specified options are directories, the
143 application prefix will be added on to the end of the path.
147 sub get_config_path {
149 my $appname = ref $c || $c;
150 my $prefix = Catalyst::Utils::appprefix( $appname );
151 my $path = Catalyst::Utils::env_value( $c, 'CONFIG' )
152 || $c->config->{ file }
153 || $c->path_to( $prefix );
155 my( $extension ) = ( $path =~ m{\.(.{1,4})$} );
158 $path =~ s{[\/\\]$}{};
162 return( $path, $extension );
165 =head2 get_config_local_suffix
167 Determines the suffix of files used to override the main config. By default
168 this value is C<local>, but it can be specified in the following order of preference:
172 =item * C<$ENV{ MYAPP_CONFIG_LOCAL_SUFFIX }>
174 =item * C<$ENV{ CATALYST_CONFIG_LOCAL_SUFFIX }>
176 =item * C<$c-E<gt>config-E<gt>{ config_local_suffix }>
182 sub get_config_local_suffix {
184 my $appname = ref $c || $c;
185 my $suffix = Catalyst::Utils::env_value( $c, 'CONFIG_LOCAL_SUFFIX' )
186 || $c->config->{ config_local_suffix }
196 prefix => $_ eq 'Component' ? '' : $_ . '::',
197 values => delete $config->{ lc $_ } || delete $config->{ $_ }
200 ref $config->{ lc $_ } || ref $config->{ $_ }
202 qw( Component Model M View V Controller C )
205 foreach my $comp ( @components ) {
206 my $prefix = $comp->{ prefix };
207 foreach my $element ( keys %{ $comp->{ values } } ) {
208 $config->{ "$prefix$element" } = $comp->{ values }->{ $element };
213 =head2 finalize_config
215 This method is called after the config file is loaded. It can be
216 used to implement tuning of config values that can only be done
217 at runtime. If you need to do this to properly configure any
218 plugins, it's important to load ConfigLoader before them.
219 ConfigLoader provides a default finalize_config method which
220 walks through the loaded config hash and calls the C<config_substitutions>
225 sub finalize_config {
227 my $v = Data::Visitor::Callback->new(
229 return unless defined $_;
230 $c->config_substitutions( $_ );
233 $v->visit( $c->config );
236 =head2 config_substitutions( $value )
238 This method substitutes macros found with calls to a function. There are three
243 =item * C<__HOME__> - replaced with C<$c-E<gt>path_to('')>
245 =item * C<__path_to(foo/bar)__> - replaced with C<$c-E<gt>path_to('foo/bar')>
247 =item * C<__literal(__FOO__)__> - leaves __FOO__ alone (allows you to use
248 C<__DATA__> as a config value, for example)
252 The parameter list is split on comma (C<,>). You can override this method to
253 do your own string munging, or you can define your own macros in
254 C<MyApp->config->{ substitutions }>. Example:
256 MyApp->config->{ substitutions } = {
257 baz => sub { my $c = shift; qux( @_ ); }
260 The above will respond to C<__baz(x,y)__> in config strings.
264 sub config_substitutions {
266 my $subs = $c->config->{ substitutions } || {};
267 $subs->{ HOME } ||= sub { shift->path_to( '' ); };
268 $subs->{ path_to } ||= sub { shift->path_to( @_ ); };
269 $subs->{ literal } ||= sub { return $_[ 1 ]; };
270 my $subsre = join( '|', keys %$subs );
273 s{__($subsre)(?:\((.+?)\))?__}{ $subs->{ $1 }->( $c, $2 ? split( /,/, $2 ) : () ) }eg;
280 Brian Cassidy E<lt>bricas@cpan.orgE<gt>
284 The following people have generously donated their time to the
285 development of this module:
289 =item * Joel Bernstein E<lt>rataxis@cpan.orgE<gt> - Rewrite to use L<Config::Any>
291 =item * David Kamholz E<lt>dkamholz@cpan.orgE<gt> - L<Data::Visitor> integration
295 Work to this module has been generously sponsored by:
299 =item * Portugal Telecom L<http://www.sapo.pt/> - Work done by Joel Bernstein
303 =head1 COPYRIGHT AND LICENSE
305 Copyright 2007 by Brian Cassidy
307 This library is free software; you can redistribute it and/or modify
308 it under the same terms as Perl itself.
316 =item * L<Catalyst::Plugin::ConfigLoader::Manual>
318 =item * L<Config::Any>