1 package Catalyst::Plugin::ConfigLoader;
8 use Data::Visitor::Callback;
9 use Catalyst::Utils ();
11 our $VERSION = '0.20';
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 => $c->config->{ 'Plugin::ConfigLoader' }->{ driver }
62 # map the array of hashrefs to a simple hash
63 my %configs = map { %$_ } @$cfg;
65 # split the responses into normal and local cfg
66 my $local_suffix = $c->get_config_local_suffix;
67 my ( @main, @locals );
68 for ( sort keys %configs ) {
69 if ( m{$local_suffix\.}ms ) {
77 # load all the normal cfgs, then the local cfgs last so they can override
79 $c->load_config( { $_ => $configs{ $_ } } ) for @main, @locals;
82 $c->NEXT::setup( @_ );
87 This method handles loading the configuration data into the Catalyst
88 context object. It does not return a value.
96 my ( $file, $config ) = %$ref;
98 $c->config( $config );
99 $c->log->debug( qq(Loaded Config "$file") )
107 This method determines the potential file paths to be used for config loading.
108 It returns an array of paths (up to the filename less the extension) to pass to
109 L<Config::Any|Config::Any> for loading.
115 my ( $path, $extension ) = $c->get_config_path;
116 my $suffix = $c->get_config_local_suffix;
117 my @extensions = @{ Config::Any->extensions };
121 next unless grep { $_ eq $extension } @extensions;
122 ( my $local = $path ) =~ s{\.$extension}{_$suffix.$extension};
123 push @files, $path, $local;
126 @files = map { ( "$path.$_", "${path}_${suffix}.$_" ) } @extensions;
132 =head2 get_config_path
134 This method determines the path, filename prefix and file extension to be used
135 for config loading. It returns the path (up to the filename less the
136 extension) to check and the specific extension to use (if it was specified).
138 The order of preference is specified as:
142 =item * C<$ENV{ MYAPP_CONFIG }>
144 =item * C<$ENV{ CATALYST_CONFIG }>
146 =item * C<$c-E<gt>config-E<gt>{ 'Plugin::ConfigLoader' }-E<gt>{ file }>
148 =item * C<$c-E<gt>path_to( $application_prefix )>
152 If either of the first two user-specified options are directories, the
153 application prefix will be added on to the end of the path.
155 DEPRECATION NOTICE: C<$c-E<gt>config-E<gt>{ file }> is deprecated
156 and will be removed in the next release.
160 sub get_config_path {
164 if ( exists $c->config->{ file } ) {
166 q(*** "file" config parameter has been deprecated in favor of "$c->config->{ 'Plugin::ConfigLoader' }->{ file }")
171 my $appname = ref $c || $c;
172 my $prefix = Catalyst::Utils::appprefix( $appname );
173 my $path = Catalyst::Utils::env_value( $c, 'CONFIG' )
174 || $c->config->{ 'Plugin::ConfigLoader' }->{ file }
175 || $c->config->{ file } # to be removed next release
176 || $c->path_to( $prefix );
178 my ( $extension ) = ( $path =~ m{\.(.{1,4})$} );
181 $path =~ s{[\/\\]$}{};
185 return ( $path, $extension );
188 =head2 get_config_local_suffix
190 Determines the suffix of files used to override the main config. By default
191 this value is C<local>, but it can be specified in the following order of preference:
195 =item * C<$ENV{ MYAPP_CONFIG_LOCAL_SUFFIX }>
197 =item * C<$ENV{ CATALYST_CONFIG_LOCAL_SUFFIX }>
199 =item * C<$c-E<gt>config-E<gt>{ 'Plugin::ConfigLoader' }-E<gt>{ config_local_suffix }>
203 DEPRECATION NOTICE: C<$c-E<gt>config-E<gt>{ config_local_suffix }> is deprecated
204 and will be removed in the next release.
208 sub get_config_local_suffix {
212 if ( exists $c->config->{ config_local_suffix } ) {
214 q(*** "config_local_suffix" config parameter has been deprecated in favor of "$c->config->{ 'Plugin::ConfigLoader' }->{ config_local_suffix }")
219 my $appname = ref $c || $c;
220 my $suffix = Catalyst::Utils::env_value( $c, 'CONFIG_LOCAL_SUFFIX' )
221 || $c->config->{ 'Plugin::ConfigLoader' }->{ config_local_suffix }
223 ->{ config_local_suffix } # to be remove in the next release
233 prefix => $_ eq 'Component' ? '' : $_ . '::',
234 values => delete $config->{ lc $_ } || delete $config->{ $_ }
236 grep { ref $config->{ lc $_ } || ref $config->{ $_ } }
237 qw( Component Model M View V Controller C )
240 foreach my $comp ( @components ) {
241 my $prefix = $comp->{ prefix };
242 foreach my $element ( keys %{ $comp->{ values } } ) {
243 $config->{ "$prefix$element" } = $comp->{ values }->{ $element };
248 =head2 finalize_config
250 This method is called after the config file is loaded. It can be
251 used to implement tuning of config values that can only be done
252 at runtime. If you need to do this to properly configure any
253 plugins, it's important to load ConfigLoader before them.
254 ConfigLoader provides a default finalize_config method which
255 walks through the loaded config hash and calls the C<config_substitutions>
260 sub finalize_config {
262 my $v = Data::Visitor::Callback->new(
264 return unless defined $_;
265 $c->config_substitutions( $_ );
268 $v->visit( $c->config );
271 =head2 config_substitutions( $value )
273 This method substitutes macros found with calls to a function. There are three
278 =item * C<__HOME__> - replaced with C<$c-E<gt>path_to('')>
280 =item * C<__path_to(foo/bar)__> - replaced with C<$c-E<gt>path_to('foo/bar')>
282 =item * C<__literal(__FOO__)__> - leaves __FOO__ alone (allows you to use
283 C<__DATA__> as a config value, for example)
287 The parameter list is split on comma (C<,>). You can override this method to
288 do your own string munging, or you can define your own macros in
289 C<MyApp-E<gt>config-E<gt>{ 'Plugin::ConfigLoader' }-E<gt>{ substitutions }>.
292 MyApp->config->{ 'Plugin::ConfigLoader' }->{ substitutions } = {
293 baz => sub { my $c = shift; qux( @_ ); }
296 The above will respond to C<__baz(x,y)__> in config strings.
300 sub config_substitutions {
302 my $subs = $c->config->{ 'Plugin::ConfigLoader' }->{ substitutions }
304 $subs->{ HOME } ||= sub { shift->path_to( '' ); };
305 $subs->{ path_to } ||= sub { shift->path_to( @_ ); };
306 $subs->{ literal } ||= sub { return $_[ 1 ]; };
307 my $subsre = join( '|', keys %$subs );
310 s{__($subsre)(?:\((.+?)\))?__}{ $subs->{ $1 }->( $c, $2 ? split( /,/, $2 ) : () ) }eg;
316 Brian Cassidy E<lt>bricas@cpan.orgE<gt>
320 The following people have generously donated their time to the
321 development of this module:
325 =item * Joel Bernstein E<lt>rataxis@cpan.orgE<gt> - Rewrite to use L<Config::Any>
327 =item * David Kamholz E<lt>dkamholz@cpan.orgE<gt> - L<Data::Visitor> integration
331 Work to this module has been generously sponsored by:
335 =item * Portugal Telecom L<http://www.sapo.pt/> - Work done by Joel Bernstein
339 =head1 COPYRIGHT AND LICENSE
341 Copyright 2008 by Brian Cassidy
343 This library is free software; you can redistribute it and/or modify
344 it under the same terms as Perl itself.
352 =item * L<Catalyst::Plugin::ConfigLoader::Manual>
354 =item * L<Config::Any>