1 package Catalyst::Plugin::ConfigLoader;
8 use Data::Visitor::Callback;
9 use Catalyst::Utils ();
11 our $VERSION = '0.19';
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( 'Plugin::ConfigLoader' => { 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,
33 INI and Perl formats. Special configuration for a particular driver format can
34 be stored in C<MyApp-E<gt>config-E<gt>{ 'Plugin::ConfigLoader' }-E<gt>{ driver }>.
36 To support the distinction between development and production environments,
37 this module will also attemp to load a local config (e.g. myapp_local.yaml)
38 which will override any duplicate settings.
44 This method is automatically called by Catalyst's setup routine. It will
45 attempt to use each plugin and, once a file has been successfully
46 loaded, set the C<config()> section.
52 my @files = $c->find_files;
53 my $cfg = Config::Any->load_files( {
55 filter => \&_fix_syntax,
57 driver_args => $c->config->{'Plugin::ConfigLoader'}->{driver} || {},
60 # split the responses into normal and local cfg
61 my $local_suffix = $c->get_config_local_suffix;
62 my( @cfg, @localcfg );
64 if( ( keys %$_ )[ 0 ] =~ m{ $local_suffix \. }xms ) {
71 # load all the normal cfgs, then the local cfgs last so they can override
73 $c->load_config( $_ ) for @cfg, @localcfg;
76 $c->NEXT::setup( @_ );
81 This method handles loading the configuration data into the Catalyst
82 context object. It does not return a value.
90 my( $file, $config ) = each %$ref;
92 $c->config( $config );
93 $c->log->debug( qq(Loaded Config "$file") )
101 This method determines the potential file paths to be used for config loading.
102 It returns an array of paths (up to the filename less the extension) to pass to
103 L<Config::Any|Config::Any> for loading.
109 my( $path, $extension ) = $c->get_config_path;
110 my $suffix = $c->get_config_local_suffix;
111 my @extensions = @{ Config::Any->extensions };
115 next unless grep { $_ eq $extension } @extensions;
116 ( my $local = $path ) =~ s{\.$extension}{_$suffix.$extension};
117 push @files, $path, $local;
119 @files = map { ( "$path.$_", "${path}_${suffix}.$_" ) } @extensions;
125 =head2 get_config_path
127 This method determines the path, filename prefix and file extension to be used
128 for config loading. It returns the path (up to the filename less the
129 extension) to check and the specific extension to use (if it was specified).
131 The order of preference is specified as:
135 =item * C<$ENV{ MYAPP_CONFIG }>
137 =item * C<$ENV{ CATALYST_CONFIG }>
139 =item * C<$c-E<gt>config-E<gt>{ 'Plugin::ConfigLoader' }-E>gt>{ file }>
141 =item * C<$c-E<gt>path_to( $application_prefix )>
145 If either of the first two user-specified options are directories, the
146 application prefix will be added on to the end of the path.
148 DEPRECATION NOTICE: C<$c-E<gt>config-E<gt>{ file }> is deprecated
149 and will be removed in the next release.
153 sub get_config_path {
157 if( exists $c->config->{ file } ) {
158 $c->log->warn( q("file" config parameter has been deprecated in favor of "$c->config->{ 'Plugin::ConfigLoader' }->{ file }") );
161 my $appname = ref $c || $c;
162 my $prefix = Catalyst::Utils::appprefix( $appname );
163 my $path = Catalyst::Utils::env_value( $c, 'CONFIG' )
164 || $c->config->{ 'Plugin::ConfigLoader' }->{ file }
165 || $c->config->{ file } # to be removed next release
166 || $c->path_to( $prefix );
168 my( $extension ) = ( $path =~ m{\.(.{1,4})$} );
171 $path =~ s{[\/\\]$}{};
175 return( $path, $extension );
178 =head2 get_config_local_suffix
180 Determines the suffix of files used to override the main config. By default
181 this value is C<local>, but it can be specified in the following order of preference:
185 =item * C<$ENV{ MYAPP_CONFIG_LOCAL_SUFFIX }>
187 =item * C<$ENV{ CATALYST_CONFIG_LOCAL_SUFFIX }>
189 =item * C<$c-E<gt>config-E<gt>{ 'Plugin::ConfigLoader' }-E<gt>{ config_local_suffix }>
193 DEPRECATION NOTICE: C<$c-E<gt>config-E<gt>{ config_local_suffix }> is deprecated
194 and will be removed in the next release.
198 sub get_config_local_suffix {
202 if( exists $c->config->{ config_local_suffix } ) {
203 $c->log->warn( q("config_local_suffix" config parameter has been deprecated in favor of "$c->config->{ 'Plugin::ConfigLoader' }->{ config_local_suffix }") );
206 my $appname = ref $c || $c;
207 my $suffix = Catalyst::Utils::env_value( $c, 'CONFIG_LOCAL_SUFFIX' )
208 || $c->config->{ 'Plugin::ConfigLoader' }->{ config_local_suffix }
209 || $c->config->{ config_local_suffix } # to be remove in the next release
219 prefix => $_ eq 'Component' ? '' : $_ . '::',
220 values => delete $config->{ lc $_ } || delete $config->{ $_ }
223 ref $config->{ lc $_ } || ref $config->{ $_ }
225 qw( Component Model M View V Controller C )
228 foreach my $comp ( @components ) {
229 my $prefix = $comp->{ prefix };
230 foreach my $element ( keys %{ $comp->{ values } } ) {
231 $config->{ "$prefix$element" } = $comp->{ values }->{ $element };
236 =head2 finalize_config
238 This method is called after the config file is loaded. It can be
239 used to implement tuning of config values that can only be done
240 at runtime. If you need to do this to properly configure any
241 plugins, it's important to load ConfigLoader before them.
242 ConfigLoader provides a default finalize_config method which
243 walks through the loaded config hash and calls the C<config_substitutions>
248 sub finalize_config {
250 my $v = Data::Visitor::Callback->new(
252 return unless defined $_;
253 $c->config_substitutions( $_ );
256 $v->visit( $c->config );
259 =head2 config_substitutions( $value )
261 This method substitutes macros found with calls to a function. There are three
266 =item * C<__HOME__> - replaced with C<$c-E<gt>path_to('')>
268 =item * C<__path_to(foo/bar)__> - replaced with C<$c-E<gt>path_to('foo/bar')>
270 =item * C<__literal(__FOO__)__> - leaves __FOO__ alone (allows you to use
271 C<__DATA__> as a config value, for example)
275 The parameter list is split on comma (C<,>). You can override this method to
276 do your own string munging, or you can define your own macros in
277 C<MyApp-E<gt>config-E<gt>{ 'Plugin::ConfigLoader' }-E<gt>{ substitutions }>.
280 MyApp->config->{ 'Plugin::ConfigLoader' }->{ substitutions } = {
281 baz => sub { my $c = shift; qux( @_ ); }
284 The above will respond to C<__baz(x,y)__> in config strings.
288 sub config_substitutions {
290 my $subs = $c->config->{ 'Plugin::ConfigLoader' }->{ substitutions } || {};
291 $subs->{ HOME } ||= sub { shift->path_to( '' ); };
292 $subs->{ path_to } ||= sub { shift->path_to( @_ ); };
293 $subs->{ literal } ||= sub { return $_[ 1 ]; };
294 my $subsre = join( '|', keys %$subs );
297 s{__($subsre)(?:\((.+?)\))?__}{ $subs->{ $1 }->( $c, $2 ? split( /,/, $2 ) : () ) }eg;
304 Brian Cassidy E<lt>bricas@cpan.orgE<gt>
308 The following people have generously donated their time to the
309 development of this module:
313 =item * Joel Bernstein E<lt>rataxis@cpan.orgE<gt> - Rewrite to use L<Config::Any>
315 =item * David Kamholz E<lt>dkamholz@cpan.orgE<gt> - L<Data::Visitor> integration
319 Work to this module has been generously sponsored by:
323 =item * Portugal Telecom L<http://www.sapo.pt/> - Work done by Joel Bernstein
327 =head1 COPYRIGHT AND LICENSE
329 Copyright 2007 by Brian Cassidy
331 This library is free software; you can redistribute it and/or modify
332 it under the same terms as Perl itself.
340 =item * L<Catalyst::Plugin::ConfigLoader::Manual>
342 =item * L<Config::Any>