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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; |
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9 | use Catalyst::Utils (); |
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10 | |
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11 | our $VERSION = '0.20'; |
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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 |
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27 | __PACKAGE__->config( 'Plugin::ConfigLoader' => { file => 'config.yaml' } ); |
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28 | |
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29 | In the file, assuming it's in YAML format: |
30 | |
31 | foo: bar |
32 | |
33 | Accessible through the context object, or the class itself |
34 | |
35 | $c->config->{foo} # bar |
36 | MyApp->config->{foo} # bar |
37 | |
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38 | =head1 DESCRIPTION |
39 | |
40 | This module will attempt to load find and load a configuration |
41 | file of various types. Currently it supports YAML, JSON, XML, |
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42 | INI and Perl formats. Special configuration for a particular driver format can |
43 | be stored in C<MyApp-E<gt>config-E<gt>{ 'Plugin::ConfigLoader' }-E<gt>{ driver }>. |
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44 | |
45 | To support the distinction between development and production environments, |
46 | this module will also attemp to load a local config (e.g. myapp_local.yaml) |
47 | which will override any duplicate settings. |
48 | |
49 | =head1 METHODS |
50 | |
51 | =head2 setup( ) |
52 | |
53 | This method is automatically called by Catalyst's setup routine. It will |
54 | attempt to use each plugin and, once a file has been successfully |
55 | loaded, set the C<config()> section. |
56 | |
57 | =cut |
58 | |
59 | sub setup { |
60 | my $c = shift; |
61 | my @files = $c->find_files; |
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62 | my $cfg = Config::Any->load_files( |
63 | { files => \@files, |
64 | filter => \&_fix_syntax, |
65 | use_ext => 1, |
66 | driver_args => $c->config->{ 'Plugin::ConfigLoader' }->{ driver } |
67 | || {}, |
68 | } |
69 | ); |
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70 | # map the array of hashrefs to a simple hash |
71 | my %configs = map { %$_ } @$cfg; |
72 | |
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73 | # split the responses into normal and local cfg |
74 | my $local_suffix = $c->get_config_local_suffix; |
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75 | my ( @main, @locals ); |
76 | for ( sort keys %configs ) { |
77 | if ( m{$local_suffix\.}ms ) { |
78 | push @locals, $_; |
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79 | } |
80 | else { |
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81 | push @main, $_; |
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82 | } |
83 | } |
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84 | |
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85 | # load all the normal cfgs, then the local cfgs last so they can override |
86 | # normal cfgs |
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87 | $c->load_config( { $_ => $configs{ $_ } } ) for @main, @locals; |
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88 | |
89 | $c->finalize_config; |
90 | $c->NEXT::setup( @_ ); |
91 | } |
92 | |
93 | =head2 load_config |
94 | |
95 | This method handles loading the configuration data into the Catalyst |
96 | context object. It does not return a value. |
97 | |
98 | =cut |
99 | |
100 | sub load_config { |
101 | my $c = shift; |
102 | my $ref = shift; |
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103 | |
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104 | my ( $file, $config ) = %$ref; |
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105 | |
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106 | $c->config( $config ); |
107 | $c->log->debug( qq(Loaded Config "$file") ) |
108 | if $c->debug; |
109 | |
110 | return; |
111 | } |
112 | |
113 | =head2 find_files |
114 | |
115 | This method determines the potential file paths to be used for config loading. |
116 | It returns an array of paths (up to the filename less the extension) to pass to |
117 | L<Config::Any|Config::Any> for loading. |
118 | |
119 | =cut |
120 | |
121 | sub find_files { |
122 | my $c = shift; |
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123 | my ( $path, $extension ) = $c->get_config_path; |
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124 | my $suffix = $c->get_config_local_suffix; |
125 | my @extensions = @{ Config::Any->extensions }; |
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126 | |
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127 | my @files; |
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128 | if ( $extension ) { |
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129 | die "Unable to handle files with the extension '${extension}'" |
130 | unless grep { $_ eq $extension } @extensions; |
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131 | ( my $local = $path ) =~ s{\.$extension}{_$suffix.$extension}; |
132 | push @files, $path, $local; |
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133 | } |
134 | else { |
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135 | @files = map { ( "$path.$_", "${path}_${suffix}.$_" ) } @extensions; |
136 | } |
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137 | @files; |
138 | } |
139 | |
140 | =head2 get_config_path |
141 | |
142 | This method determines the path, filename prefix and file extension to be used |
143 | for config loading. It returns the path (up to the filename less the |
144 | extension) to check and the specific extension to use (if it was specified). |
145 | |
146 | The order of preference is specified as: |
147 | |
148 | =over 4 |
149 | |
150 | =item * C<$ENV{ MYAPP_CONFIG }> |
151 | |
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152 | =item * C<$ENV{ CATALYST_CONFIG }> |
153 | |
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154 | =item * C<$c-E<gt>config-E<gt>{ 'Plugin::ConfigLoader' }-E<gt>{ file }> |
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155 | |
156 | =item * C<$c-E<gt>path_to( $application_prefix )> |
157 | |
158 | =back |
159 | |
160 | If either of the first two user-specified options are directories, the |
161 | application prefix will be added on to the end of the path. |
162 | |
163 | =cut |
164 | |
165 | sub get_config_path { |
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166 | my $c = shift; |
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167 | |
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168 | |
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169 | my $appname = ref $c || $c; |
170 | my $prefix = Catalyst::Utils::appprefix( $appname ); |
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171 | my $path = Catalyst::Utils::env_value( $c, 'CONFIG' ) |
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172 | || $c->config->{ 'Plugin::ConfigLoader' }->{ file } |
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173 | || $c->path_to( $prefix ); |
174 | |
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175 | my ( $extension ) = ( $path =~ m{\.(.{1,4})$} ); |
176 | |
177 | if ( -d $path ) { |
178 | $path =~ s{[\/\\]$}{}; |
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179 | $path .= "/$prefix"; |
180 | } |
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181 | |
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182 | return ( $path, $extension ); |
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183 | } |
184 | |
185 | =head2 get_config_local_suffix |
186 | |
187 | Determines the suffix of files used to override the main config. By default |
188 | this value is C<local>, but it can be specified in the following order of preference: |
189 | |
190 | =over 4 |
191 | |
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192 | =item * C<$ENV{ MYAPP_CONFIG_LOCAL_SUFFIX }> |
193 | |
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194 | =item * C<$ENV{ CATALYST_CONFIG_LOCAL_SUFFIX }> |
195 | |
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196 | =item * C<$c-E<gt>config-E<gt>{ 'Plugin::ConfigLoader' }-E<gt>{ config_local_suffix }> |
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197 | |
198 | =back |
199 | |
200 | =cut |
201 | |
202 | sub get_config_local_suffix { |
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203 | my $c = shift; |
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204 | |
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205 | my $appname = ref $c || $c; |
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206 | my $suffix = Catalyst::Utils::env_value( $c, 'CONFIG_LOCAL_SUFFIX' ) |
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207 | || $c->config->{ 'Plugin::ConfigLoader' }->{ config_local_suffix } |
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208 | || 'local'; |
209 | |
210 | return $suffix; |
211 | } |
212 | |
213 | sub _fix_syntax { |
214 | my $config = shift; |
215 | my @components = ( |
216 | map +{ |
217 | prefix => $_ eq 'Component' ? '' : $_ . '::', |
218 | values => delete $config->{ lc $_ } || delete $config->{ $_ } |
219 | }, |
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220 | grep { ref $config->{ lc $_ } || ref $config->{ $_ } } |
221 | qw( Component Model M View V Controller C ) |
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222 | ); |
223 | |
224 | foreach my $comp ( @components ) { |
225 | my $prefix = $comp->{ prefix }; |
226 | foreach my $element ( keys %{ $comp->{ values } } ) { |
227 | $config->{ "$prefix$element" } = $comp->{ values }->{ $element }; |
228 | } |
229 | } |
230 | } |
231 | |
232 | =head2 finalize_config |
233 | |
234 | This method is called after the config file is loaded. It can be |
235 | used to implement tuning of config values that can only be done |
236 | at runtime. If you need to do this to properly configure any |
237 | plugins, it's important to load ConfigLoader before them. |
238 | ConfigLoader provides a default finalize_config method which |
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239 | walks through the loaded config hash and calls the C<config_substitutions> |
240 | sub on any string. |
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241 | |
242 | =cut |
243 | |
244 | sub finalize_config { |
245 | my $c = shift; |
246 | my $v = Data::Visitor::Callback->new( |
247 | plain_value => sub { |
248 | return unless defined $_; |
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249 | $c->config_substitutions( $_ ); |
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250 | } |
251 | ); |
252 | $v->visit( $c->config ); |
253 | } |
254 | |
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255 | =head2 config_substitutions( $value ) |
256 | |
257 | This method substitutes macros found with calls to a function. There are three |
258 | default macros: |
259 | |
260 | =over 4 |
261 | |
262 | =item * C<__HOME__> - replaced with C<$c-E<gt>path_to('')> |
263 | |
264 | =item * C<__path_to(foo/bar)__> - replaced with C<$c-E<gt>path_to('foo/bar')> |
265 | |
266 | =item * C<__literal(__FOO__)__> - leaves __FOO__ alone (allows you to use |
267 | C<__DATA__> as a config value, for example) |
268 | |
269 | =back |
270 | |
271 | The parameter list is split on comma (C<,>). You can override this method to |
272 | do your own string munging, or you can define your own macros in |
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273 | C<MyApp-E<gt>config-E<gt>{ 'Plugin::ConfigLoader' }-E<gt>{ substitutions }>. |
274 | Example: |
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275 | |
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276 | MyApp->config->{ 'Plugin::ConfigLoader' }->{ substitutions } = { |
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277 | baz => sub { my $c = shift; qux( @_ ); } |
278 | } |
279 | |
280 | The above will respond to C<__baz(x,y)__> in config strings. |
281 | |
282 | =cut |
283 | |
284 | sub config_substitutions { |
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285 | my $c = shift; |
286 | my $subs = $c->config->{ 'Plugin::ConfigLoader' }->{ substitutions } |
287 | || {}; |
288 | $subs->{ HOME } ||= sub { shift->path_to( '' ); }; |
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289 | $subs->{ path_to } ||= sub { shift->path_to( @_ ); }; |
290 | $subs->{ literal } ||= sub { return $_[ 1 ]; }; |
291 | my $subsre = join( '|', keys %$subs ); |
292 | |
293 | for ( @_ ) { |
294 | s{__($subsre)(?:\((.+?)\))?__}{ $subs->{ $1 }->( $c, $2 ? split( /,/, $2 ) : () ) }eg; |
295 | } |
296 | } |
297 | |
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298 | =head1 AUTHOR |
299 | |
01be879a |
300 | Brian Cassidy E<lt>bricas@cpan.orgE<gt> |
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301 | |
302 | =head1 CONTRIBUTORS |
303 | |
304 | The following people have generously donated their time to the |
305 | development of this module: |
306 | |
307 | =over 4 |
308 | |
309 | =item * Joel Bernstein E<lt>rataxis@cpan.orgE<gt> - Rewrite to use L<Config::Any> |
310 | |
311 | =item * David Kamholz E<lt>dkamholz@cpan.orgE<gt> - L<Data::Visitor> integration |
312 | |
313 | =back |
314 | |
315 | Work to this module has been generously sponsored by: |
316 | |
317 | =over 4 |
318 | |
319 | =item * Portugal Telecom L<http://www.sapo.pt/> - Work done by Joel Bernstein |
320 | |
321 | =back |
322 | |
323 | =head1 COPYRIGHT AND LICENSE |
324 | |
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325 | Copyright 2008 by Brian Cassidy |
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326 | |
327 | This library is free software; you can redistribute it and/or modify |
328 | it under the same terms as Perl itself. |
329 | |
330 | =head1 SEE ALSO |
331 | |
332 | =over 4 |
333 | |
334 | =item * L<Catalyst> |
335 | |
affbca23 |
336 | =item * L<Catalyst::Plugin::ConfigLoader::Manual> |
337 | |
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338 | =item * L<Config::Any> |
339 | |
340 | =back |
341 | |
342 | =cut |
343 | |
344 | 1; |