Commit | Line | Data |
f004a98a |
1 | package Catalyst::Plugin::ConfigLoader; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
6 | use Config::Any; |
7 | use NEXT; |
8 | use Data::Visitor::Callback; |
7f0397f8 |
9 | use Catalyst::Utils (); |
f004a98a |
10 | |
4f63af80 |
11 | our $VERSION = '0.19'; |
f004a98a |
12 | |
13 | =head1 NAME |
14 | |
15 | Catalyst::Plugin::ConfigLoader - Load config files of various types |
16 | |
17 | =head1 SYNOPSIS |
18 | |
19 | package MyApp; |
20 | |
21 | # ConfigLoader should be first in your list so |
22 | # other plugins can get the config information |
23 | use Catalyst qw( ConfigLoader ... ); |
24 | |
25 | # by default myapp.* will be loaded |
26 | # you can specify a file if you'd like |
3231a8d0 |
27 | __PACKAGE__->config( 'Plugin::ConfigLoader' => { file => 'config.yaml' } ); |
f004a98a |
28 | |
29 | =head1 DESCRIPTION |
30 | |
31 | This module will attempt to load find and load a configuration |
32 | file of various types. Currently it supports YAML, JSON, XML, |
3231a8d0 |
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 }>. |
f004a98a |
35 | |
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. |
39 | |
40 | =head1 METHODS |
41 | |
42 | =head2 setup( ) |
43 | |
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. |
47 | |
48 | =cut |
49 | |
50 | sub setup { |
51 | my $c = shift; |
52 | my @files = $c->find_files; |
53 | my $cfg = Config::Any->load_files( { |
3231a8d0 |
54 | files => \@files, |
55 | filter => \&_fix_syntax, |
56 | use_ext => 1, |
57 | driver_args => $c->config->{'Plugin::ConfigLoader'}->{driver} || {}, |
f004a98a |
58 | } ); |
59 | |
60 | # split the responses into normal and local cfg |
61 | my $local_suffix = $c->get_config_local_suffix; |
62 | my( @cfg, @localcfg ); |
63 | for( @$cfg ) { |
64 | if( ( keys %$_ )[ 0 ] =~ m{ $local_suffix \. }xms ) { |
65 | push @localcfg, $_; |
66 | } else { |
67 | push @cfg, $_; |
68 | } |
69 | } |
70 | |
71 | # load all the normal cfgs, then the local cfgs last so they can override |
72 | # normal cfgs |
73 | $c->load_config( $_ ) for @cfg, @localcfg; |
74 | |
75 | $c->finalize_config; |
76 | $c->NEXT::setup( @_ ); |
77 | } |
78 | |
79 | =head2 load_config |
80 | |
81 | This method handles loading the configuration data into the Catalyst |
82 | context object. It does not return a value. |
83 | |
84 | =cut |
85 | |
86 | sub load_config { |
87 | my $c = shift; |
88 | my $ref = shift; |
89 | |
90 | my( $file, $config ) = each %$ref; |
91 | |
92 | $c->config( $config ); |
93 | $c->log->debug( qq(Loaded Config "$file") ) |
94 | if $c->debug; |
95 | |
96 | return; |
97 | } |
98 | |
99 | =head2 find_files |
100 | |
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. |
104 | |
105 | =cut |
106 | |
107 | sub find_files { |
108 | my $c = shift; |
109 | my( $path, $extension ) = $c->get_config_path; |
110 | my $suffix = $c->get_config_local_suffix; |
111 | my @extensions = @{ Config::Any->extensions }; |
112 | |
113 | my @files; |
114 | if ($extension) { |
115 | next unless grep { $_ eq $extension } @extensions; |
4f63af80 |
116 | ( my $local = $path ) =~ s{\.$extension}{_$suffix.$extension}; |
117 | push @files, $path, $local; |
f004a98a |
118 | } else { |
119 | @files = map { ( "$path.$_", "${path}_${suffix}.$_" ) } @extensions; |
120 | } |
121 | |
122 | @files; |
123 | } |
124 | |
125 | =head2 get_config_path |
126 | |
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). |
130 | |
131 | The order of preference is specified as: |
132 | |
133 | =over 4 |
134 | |
135 | =item * C<$ENV{ MYAPP_CONFIG }> |
136 | |
7f0397f8 |
137 | =item * C<$ENV{ CATALYST_CONFIG }> |
138 | |
af391898 |
139 | =item * C<$c-E<gt>config-E<gt>{ 'Plugin::ConfigLoader' }-E>gt>{ file }> |
f004a98a |
140 | |
141 | =item * C<$c-E<gt>path_to( $application_prefix )> |
142 | |
143 | =back |
144 | |
145 | If either of the first two user-specified options are directories, the |
146 | application prefix will be added on to the end of the path. |
147 | |
af391898 |
148 | DEPRECATION NOTICE: C<$c-E<gt>config-E<gt>{ file }> is deprecated |
149 | and will be removed in the next release. |
150 | |
f004a98a |
151 | =cut |
152 | |
153 | sub get_config_path { |
154 | my $c = shift; |
afce197f |
155 | |
156 | # deprecation notice |
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 }") ); |
159 | } |
160 | |
f004a98a |
161 | my $appname = ref $c || $c; |
162 | my $prefix = Catalyst::Utils::appprefix( $appname ); |
7f0397f8 |
163 | my $path = Catalyst::Utils::env_value( $c, 'CONFIG' ) |
af391898 |
164 | || $c->config->{ 'Plugin::ConfigLoader' }->{ file } |
165 | || $c->config->{ file } # to be removed next release |
f004a98a |
166 | || $c->path_to( $prefix ); |
167 | |
168 | my( $extension ) = ( $path =~ m{\.(.{1,4})$} ); |
169 | |
170 | if( -d $path ) { |
171 | $path =~ s{[\/\\]$}{}; |
172 | $path .= "/$prefix"; |
173 | } |
4f63af80 |
174 | |
f004a98a |
175 | return( $path, $extension ); |
176 | } |
177 | |
178 | =head2 get_config_local_suffix |
179 | |
180 | Determines the suffix of files used to override the main config. By default |
181 | this value is C<local>, but it can be specified in the following order of preference: |
182 | |
183 | =over 4 |
184 | |
f004a98a |
185 | =item * C<$ENV{ MYAPP_CONFIG_LOCAL_SUFFIX }> |
186 | |
7f0397f8 |
187 | =item * C<$ENV{ CATALYST_CONFIG_LOCAL_SUFFIX }> |
188 | |
af391898 |
189 | =item * C<$c-E<gt>config-E<gt>{ 'Plugin::ConfigLoader' }-E<gt>{ config_local_suffix }> |
f004a98a |
190 | |
191 | =back |
192 | |
af391898 |
193 | DEPRECATION NOTICE: C<$c-E<gt>config-E<gt>{ config_local_suffix }> is deprecated |
194 | and will be removed in the next release. |
195 | |
f004a98a |
196 | =cut |
197 | |
198 | sub get_config_local_suffix { |
199 | my $c = shift; |
afce197f |
200 | |
201 | # deprecation notice |
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 }") ); |
204 | } |
205 | |
f004a98a |
206 | my $appname = ref $c || $c; |
7f0397f8 |
207 | my $suffix = Catalyst::Utils::env_value( $c, 'CONFIG_LOCAL_SUFFIX' ) |
af391898 |
208 | || $c->config->{ 'Plugin::ConfigLoader' }->{ config_local_suffix } |
209 | || $c->config->{ config_local_suffix } # to be remove in the next release |
f004a98a |
210 | || 'local'; |
211 | |
212 | return $suffix; |
213 | } |
214 | |
215 | sub _fix_syntax { |
216 | my $config = shift; |
217 | my @components = ( |
218 | map +{ |
219 | prefix => $_ eq 'Component' ? '' : $_ . '::', |
220 | values => delete $config->{ lc $_ } || delete $config->{ $_ } |
221 | }, |
222 | grep { |
223 | ref $config->{ lc $_ } || ref $config->{ $_ } |
224 | } |
225 | qw( Component Model M View V Controller C ) |
226 | ); |
227 | |
228 | foreach my $comp ( @components ) { |
229 | my $prefix = $comp->{ prefix }; |
230 | foreach my $element ( keys %{ $comp->{ values } } ) { |
231 | $config->{ "$prefix$element" } = $comp->{ values }->{ $element }; |
232 | } |
233 | } |
234 | } |
235 | |
236 | =head2 finalize_config |
237 | |
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 |
d392c48d |
243 | walks through the loaded config hash and calls the C<config_substitutions> |
244 | sub on any string. |
f004a98a |
245 | |
246 | =cut |
247 | |
248 | sub finalize_config { |
249 | my $c = shift; |
250 | my $v = Data::Visitor::Callback->new( |
251 | plain_value => sub { |
252 | return unless defined $_; |
d392c48d |
253 | $c->config_substitutions( $_ ); |
f004a98a |
254 | } |
255 | ); |
256 | $v->visit( $c->config ); |
257 | } |
258 | |
d392c48d |
259 | =head2 config_substitutions( $value ) |
260 | |
261 | This method substitutes macros found with calls to a function. There are three |
262 | default macros: |
263 | |
264 | =over 4 |
265 | |
266 | =item * C<__HOME__> - replaced with C<$c-E<gt>path_to('')> |
267 | |
268 | =item * C<__path_to(foo/bar)__> - replaced with C<$c-E<gt>path_to('foo/bar')> |
269 | |
270 | =item * C<__literal(__FOO__)__> - leaves __FOO__ alone (allows you to use |
271 | C<__DATA__> as a config value, for example) |
272 | |
273 | =back |
274 | |
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 |
af391898 |
277 | C<MyApp-E<gt>config-E<gt>{ 'Plugin::ConfigLoader' }-E<gt>{ substitutions }>. |
278 | Example: |
d392c48d |
279 | |
af391898 |
280 | MyApp->config->{ 'Plugin::ConfigLoader' }->{ substitutions } = { |
d392c48d |
281 | baz => sub { my $c = shift; qux( @_ ); } |
282 | } |
283 | |
284 | The above will respond to C<__baz(x,y)__> in config strings. |
285 | |
286 | =cut |
287 | |
288 | sub config_substitutions { |
289 | my $c = shift; |
af391898 |
290 | my $subs = $c->config->{ 'Plugin::ConfigLoader' }->{ substitutions } || {}; |
d392c48d |
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 ); |
295 | |
296 | for ( @_ ) { |
297 | s{__($subsre)(?:\((.+?)\))?__}{ $subs->{ $1 }->( $c, $2 ? split( /,/, $2 ) : () ) }eg; |
298 | } |
299 | } |
300 | |
301 | |
f004a98a |
302 | =head1 AUTHOR |
303 | |
01be879a |
304 | Brian Cassidy E<lt>bricas@cpan.orgE<gt> |
f004a98a |
305 | |
306 | =head1 CONTRIBUTORS |
307 | |
308 | The following people have generously donated their time to the |
309 | development of this module: |
310 | |
311 | =over 4 |
312 | |
313 | =item * Joel Bernstein E<lt>rataxis@cpan.orgE<gt> - Rewrite to use L<Config::Any> |
314 | |
315 | =item * David Kamholz E<lt>dkamholz@cpan.orgE<gt> - L<Data::Visitor> integration |
316 | |
317 | =back |
318 | |
319 | Work to this module has been generously sponsored by: |
320 | |
321 | =over 4 |
322 | |
323 | =item * Portugal Telecom L<http://www.sapo.pt/> - Work done by Joel Bernstein |
324 | |
325 | =back |
326 | |
327 | =head1 COPYRIGHT AND LICENSE |
328 | |
80ffa192 |
329 | Copyright 2007 by Brian Cassidy |
f004a98a |
330 | |
331 | This library is free software; you can redistribute it and/or modify |
332 | it under the same terms as Perl itself. |
333 | |
334 | =head1 SEE ALSO |
335 | |
336 | =over 4 |
337 | |
338 | =item * L<Catalyst> |
339 | |
affbca23 |
340 | =item * L<Catalyst::Plugin::ConfigLoader::Manual> |
341 | |
f004a98a |
342 | =item * L<Config::Any> |
343 | |
344 | =back |
345 | |
346 | =cut |
347 | |
348 | 1; |