4 extends 'Catalyst::Component';
5 use Moose::Util qw/find_meta/;
8 use Catalyst::Exception;
10 use Catalyst::Request;
11 use Catalyst::Request::Upload;
12 use Catalyst::Response;
14 use Catalyst::Controller;
15 use Devel::InnerPackage ();
17 use Module::Pluggable::Object ();
18 use Text::SimpleTable ();
19 use Path::Class::Dir ();
20 use Path::Class::File ();
24 use Tree::Simple qw/use_weak_refs/;
25 use Tree::Simple::Visitor::FindByUID;
26 use Class::C3::Adopt::NEXT;
29 use Carp qw/croak carp shortmess/;
31 BEGIN { require 5.008001; }
33 has stack => (is => 'ro', default => sub { [] });
34 has stash => (is => 'rw', default => sub { {} });
35 has state => (is => 'rw', default => 0);
36 has stats => (is => 'rw');
37 has action => (is => 'rw');
38 has counter => (is => 'rw', default => sub { {} });
39 has request => (is => 'rw', default => sub { $_[0]->request_class->new({}) }, required => 1, lazy => 1);
40 has response => (is => 'rw', default => sub { $_[0]->response_class->new({}) }, required => 1, lazy => 1);
41 has namespace => (is => 'rw');
43 sub depth { scalar @{ shift->stack || [] }; }
44 sub comp { shift->component(@_) }
47 my $self = shift; return $self->request(@_);
50 my $self = shift; return $self->response(@_);
53 # For backwards compatibility
54 sub finalize_output { shift->finalize_body(@_) };
59 our $RECURSION = 1000;
60 our $DETACH = "catalyst_detach\n";
61 our $GO = "catalyst_go\n";
63 #I imagine that very few of these really need to be class variables. if any.
64 #maybe we should just make them attributes with a default?
65 __PACKAGE__->mk_classdata($_)
66 for qw/components arguments dispatcher engine log dispatcher_class
67 engine_class context_class request_class response_class stats_class
70 __PACKAGE__->dispatcher_class('Catalyst::Dispatcher');
71 __PACKAGE__->engine_class('Catalyst::Engine::CGI');
72 __PACKAGE__->request_class('Catalyst::Request');
73 __PACKAGE__->response_class('Catalyst::Response');
74 __PACKAGE__->stats_class('Catalyst::Stats');
76 # Remember to update this in Catalyst::Runtime as well!
78 our $VERSION = '5.80003';
81 my $dev_version = $VERSION =~ /_\d{2}$/;
82 *_IS_DEVELOPMENT_VERSION = sub () { $dev_version };
85 $VERSION = eval $VERSION;
88 my ( $class, @arguments ) = @_;
90 # We have to limit $class to Catalyst to avoid pushing Catalyst upon every
92 return unless $class eq 'Catalyst';
94 my $caller = caller();
95 return if $caller eq 'main';
97 # Kill Adopt::NEXT warnings if we're a non-RC version
98 unless (_IS_DEVELOPMENT_VERSION()) {
99 Class::C3::Adopt::NEXT->unimport(qr/^Catalyst::/);
102 my $meta = Moose::Meta::Class->initialize($caller);
103 #Moose->import({ into => $caller }); #do we want to do this?
105 unless ( $caller->isa('Catalyst') ) {
106 my @superclasses = ($meta->superclasses, $class, 'Catalyst::Controller');
107 $meta->superclasses(@superclasses);
109 unless( $meta->has_method('meta') ){
110 $meta->add_method(meta => sub { Moose::Meta::Class->initialize("${caller}") } );
113 $caller->arguments( [@arguments] );
119 Catalyst - The Elegant MVC Web Application Framework
123 See the L<Catalyst::Manual> distribution for comprehensive
124 documentation and tutorials.
126 # Install Catalyst::Devel for helpers and other development tools
127 # use the helper to create a new application
130 # add models, views, controllers
131 script/myapp_create.pl model MyDatabase DBIC::Schema create=static dbi:SQLite:/path/to/db
132 script/myapp_create.pl view MyTemplate TT
133 script/myapp_create.pl controller Search
135 # built in testserver -- use -r to restart automatically on changes
136 # --help to see all available options
137 script/myapp_server.pl
139 # command line testing interface
140 script/myapp_test.pl /yada
143 use Catalyst qw/-Debug/; # include plugins here as well
145 ### In lib/MyApp/Controller/Root.pm (autocreated)
146 sub foo : Global { # called for /foo, /foo/1, /foo/1/2, etc.
147 my ( $self, $c, @args ) = @_; # args are qw/1 2/ for /foo/1/2
148 $c->stash->{template} = 'foo.tt'; # set the template
149 # lookup something from db -- stash vars are passed to TT
151 $c->model('Database::Foo')->search( { country => $args[0] } );
152 if ( $c->req->params->{bar} ) { # access GET or POST parameters
153 $c->forward( 'bar' ); # process another action
154 # do something else after forward returns
158 # The foo.tt TT template can use the stash data from the database
159 [% WHILE (item = data.next) %]
163 # called for /bar/of/soap, /bar/of/soap/10, etc.
164 sub bar : Path('/bar/of/soap') { ... }
166 # called for all actions, from the top-most controller downwards
168 my ( $self, $c ) = @_;
169 if ( !$c->user_exists ) { # Catalyst::Plugin::Authentication
170 $c->res->redirect( '/login' ); # require login
171 return 0; # abort request and go immediately to end()
173 return 1; # success; carry on to next action
176 # called after all actions are finished
178 my ( $self, $c ) = @_;
179 if ( scalar @{ $c->error } ) { ... } # handle errors
180 return if $c->res->body; # already have a response
181 $c->forward( 'MyApp::View::TT' ); # render template
184 ### in MyApp/Controller/Foo.pm
185 # called for /foo/bar
186 sub bar : Local { ... }
188 # called for /blargle
189 sub blargle : Global { ... }
191 # an index action matches /foo, but not /foo/1, etc.
192 sub index : Private { ... }
194 ### in MyApp/Controller/Foo/Bar.pm
195 # called for /foo/bar/baz
196 sub baz : Local { ... }
198 # first Root auto is called, then Foo auto, then this
199 sub auto : Private { ... }
201 # powerful regular expression paths are also possible
202 sub details : Regex('^product/(\w+)/details$') {
203 my ( $self, $c ) = @_;
204 # extract the (\w+) from the URI
205 my $product = $c->req->captures->[0];
208 See L<Catalyst::Manual::Intro> for additional information.
212 Catalyst is a modern framework for making web applications without the
213 pain usually associated with this process. This document is a reference
214 to the main Catalyst application. If you are a new user, we suggest you
215 start with L<Catalyst::Manual::Tutorial> or L<Catalyst::Manual::Intro>.
217 See L<Catalyst::Manual> for more documentation.
219 Catalyst plugins can be loaded by naming them as arguments to the "use
220 Catalyst" statement. Omit the C<Catalyst::Plugin::> prefix from the
221 plugin name, i.e., C<Catalyst::Plugin::My::Module> becomes
224 use Catalyst qw/My::Module/;
226 If your plugin starts with a name other than C<Catalyst::Plugin::>, you can
227 fully qualify the name by using a unary plus:
231 +Fully::Qualified::Plugin::Name
234 Special flags like C<-Debug> and C<-Engine> can also be specified as
235 arguments when Catalyst is loaded:
237 use Catalyst qw/-Debug My::Module/;
239 The position of plugins and flags in the chain is important, because
240 they are loaded in the order in which they appear.
242 The following flags are supported:
246 Enables debug output. You can also force this setting from the system
247 environment with CATALYST_DEBUG or <MYAPP>_DEBUG. The environment
248 settings override the application, with <MYAPP>_DEBUG having the highest
253 Forces Catalyst to use a specific engine. Omit the
254 C<Catalyst::Engine::> prefix of the engine name, i.e.:
256 use Catalyst qw/-Engine=CGI/;
260 Forces Catalyst to use a specific home directory, e.g.:
262 use Catalyst qw[-Home=/usr/mst];
264 This can also be done in the shell environment by setting either the
265 C<CATALYST_HOME> environment variable or C<MYAPP_HOME>; where C<MYAPP>
266 is replaced with the uppercased name of your application, any "::" in
267 the name will be replaced with underscores, e.g. MyApp::Web should use
268 MYAPP_WEB_HOME. If both variables are set, the MYAPP_HOME one will be used.
272 use Catalyst '-Log=warn,fatal,error';
274 Specifies a comma-delimited list of log levels.
278 Enables statistics collection and reporting. You can also force this setting
279 from the system environment with CATALYST_STATS or <MYAPP>_STATS. The
280 environment settings override the application, with <MYAPP>_STATS having the
285 use Catalyst qw/-Stats=1/
289 =head2 INFORMATION ABOUT THE CURRENT REQUEST
293 Returns a L<Catalyst::Action> object for the current action, which
294 stringifies to the action name. See L<Catalyst::Action>.
298 Returns the namespace of the current action, i.e., the URI prefix
299 corresponding to the controller of the current action. For example:
301 # in Controller::Foo::Bar
302 $c->namespace; # returns 'foo/bar';
308 Returns the current L<Catalyst::Request> object, giving access to
309 information about the current client request (including parameters,
310 cookies, HTTP headers, etc.). See L<Catalyst::Request>.
312 =head2 REQUEST FLOW HANDLING
314 =head2 $c->forward( $action [, \@arguments ] )
316 =head2 $c->forward( $class, $method, [, \@arguments ] )
318 Forwards processing to another action, by its private name. If you give a
319 class name but no method, C<process()> is called. You may also optionally
320 pass arguments in an arrayref. The action will receive the arguments in
321 C<@_> and C<< $c->req->args >>. Upon returning from the function,
322 C<< $c->req->args >> will be restored to the previous values.
324 Any data C<return>ed from the action forwarded to, will be returned by the
327 my $foodata = $c->forward('/foo');
328 $c->forward('index');
329 $c->forward(qw/MyApp::Model::DBIC::Foo do_stuff/);
330 $c->forward('MyApp::View::TT');
332 Note that forward implies an C<<eval { }>> around the call (actually
333 C<execute> does), thus de-fatalizing all 'dies' within the called
334 action. If you want C<die> to propagate you need to do something like:
337 die $c->error if $c->error;
339 Or make sure to always return true values from your actions and write
342 $c->forward('foo') || return;
346 sub forward { my $c = shift; no warnings 'recursion'; $c->dispatcher->forward( $c, @_ ) }
348 =head2 $c->detach( $action [, \@arguments ] )
350 =head2 $c->detach( $class, $method, [, \@arguments ] )
354 The same as C<forward>, but doesn't return to the previous action when
355 processing is finished.
357 When called with no arguments it escapes the processing chain entirely.
361 sub detach { my $c = shift; $c->dispatcher->detach( $c, @_ ) }
363 =head2 $c->visit( $action [, \@captures, \@arguments ] )
365 =head2 $c->visit( $class, $method, [, \@captures, \@arguments ] )
367 Almost the same as C<forward>, but does a full dispatch, instead of just
368 calling the new C<$action> / C<$class-E<gt>$method>. This means that C<begin>,
369 C<auto> and the method you go to are called, just like a new request.
371 In addition both C<< $c->action >> and C<< $c->namespace >> are localized.
372 This means, for example, that $c->action methods such as C<name>, C<class> and
373 C<reverse> return information for the visited action when they are invoked
374 within the visited action. This is different from the behavior of C<forward>
375 which continues to use the $c->action object from the caller action even when
376 invoked from the callee.
378 C<$c-E<gt>stash> is kept unchanged.
380 In effect, C<visit> allows you to "wrap" another action, just as it
381 would have been called by dispatching from a URL, while the analogous
382 C<go> allows you to transfer control to another action as if it had
383 been reached directly from a URL.
387 sub visit { my $c = shift; $c->dispatcher->visit( $c, @_ ) }
389 =head2 $c->go( $action [, \@captures, \@arguments ] )
391 =head2 $c->go( $class, $method, [, \@captures, \@arguments ] )
393 Almost the same as C<detach>, but does a full dispatch like C<visit>,
394 instead of just calling the new C<$action> /
395 C<$class-E<gt>$method>. This means that C<begin>, C<auto> and the
396 method you visit are called, just like a new request.
398 C<$c-E<gt>stash> is kept unchanged.
402 sub go { my $c = shift; $c->dispatcher->go( $c, @_ ) }
408 Returns the current L<Catalyst::Response> object, see there for details.
412 Returns a hashref to the stash, which may be used to store data and pass
413 it between components during a request. You can also set hash keys by
414 passing arguments. The stash is automatically sent to the view. The
415 stash is cleared at the end of a request; it cannot be used for
416 persistent storage (for this you must use a session; see
417 L<Catalyst::Plugin::Session> for a complete system integrated with
420 $c->stash->{foo} = $bar;
421 $c->stash( { moose => 'majestic', qux => 0 } );
422 $c->stash( bar => 1, gorch => 2 ); # equivalent to passing a hashref
424 # stash is automatically passed to the view for use in a template
425 $c->forward( 'MyApp::View::TT' );
429 around stash => sub {
432 my $stash = $orig->($c);
434 my $new_stash = @_ > 1 ? {@_} : $_[0];
435 croak('stash takes a hash or hashref') unless ref $new_stash;
436 foreach my $key ( keys %$new_stash ) {
437 $stash->{$key} = $new_stash->{$key};
447 =head2 $c->error($error, ...)
449 =head2 $c->error($arrayref)
451 Returns an arrayref containing error messages. If Catalyst encounters an
452 error while processing a request, it stores the error in $c->error. This
453 method should only be used to store fatal error messages.
455 my @error = @{ $c->error };
459 $c->error('Something bad happened');
466 my $error = ref $_[0] eq 'ARRAY' ? $_[0] : [@_];
467 croak @$error unless ref $c;
468 push @{ $c->{error} }, @$error;
470 elsif ( defined $_[0] ) { $c->{error} = undef }
471 return $c->{error} || [];
477 Contains the return value of the last executed action.
479 =head2 $c->clear_errors
481 Clear errors. You probably don't want to clear the errors unless you are
482 implementing a custom error screen.
484 This is equivalent to running
495 # search components given a name and some prefixes
496 sub _comp_search_prefixes {
497 my ( $c, $name, @prefixes ) = @_;
498 my $appclass = ref $c || $c;
499 my $filter = "^${appclass}::(" . join( '|', @prefixes ) . ')::';
500 $filter = qr/$filter/; # Compile regex now rather than once per loop
502 # map the original component name to the sub part that we will search against
503 my %eligible = map { my $n = $_; $n =~ s{^$appclass\::[^:]+::}{}; $_ => $n; }
504 grep { /$filter/ } keys %{ $c->components };
506 # undef for a name will return all
507 return keys %eligible if !defined $name;
509 my $query = ref $name ? $name : qr/^$name$/i;
510 my @result = grep { $eligible{$_} =~ m{$query} } keys %eligible;
512 return map { $c->components->{ $_ } } @result if @result;
514 # if we were given a regexp to search against, we're done.
519 @result = map { $c->components->{ $_ } } grep { $eligible{ $_ } =~ m{$query} } keys %eligible;
521 # no results? try against full names
523 @result = map { $c->components->{ $_ } } grep { m{$query} } keys %eligible;
526 # don't warn if we didn't find any results, it just might not exist
528 # Disgusting hack to work out correct method name
529 my $warn_for = lc $prefixes[0];
530 my $msg = "Used regexp fallback for \$c->${warn_for}('${name}'), which found '" .
531 (join '", "', @result) . "'. Relying on regexp fallback behavior for " .
532 "component resolution is unreliable and unsafe.";
533 my $short = $result[0];
534 $short =~ s/.*?Model:://;
535 my $shortmess = Carp::shortmess('');
536 if ($shortmess =~ m#Catalyst/Plugin#) {
537 $msg .= " You probably need to set '$short' instead of '${name}' in this " .
539 } elsif ($shortmess =~ m#Catalyst/lib/(View|Controller)#) {
540 $msg .= " You probably need to set '$short' instead of '${name}' in this " .
541 "component's config";
543 $msg .= " You probably meant \$c->${warn_for}('$short') instead of \$c->${warn_for}({'${name}'}), " .
544 "but if you really wanted to search, pass in a regexp as the argument " .
545 "like so: \$c->${warn_for}(qr/${name}/)";
547 $c->log->warn( "${msg}$shortmess" );
553 # Find possible names for a prefix
555 my ( $c, @prefixes ) = @_;
556 my $appclass = ref $c || $c;
558 my $filter = "^${appclass}::(" . join( '|', @prefixes ) . ')::';
560 my @names = map { s{$filter}{}; $_; } $c->_comp_search_prefixes( undef, @prefixes );
564 # Filter a component before returning by calling ACCEPT_CONTEXT if available
565 sub _filter_component {
566 my ( $c, $comp, @args ) = @_;
568 if ( eval { $comp->can('ACCEPT_CONTEXT'); } ) {
569 return $comp->ACCEPT_CONTEXT( $c, @args );
575 =head2 COMPONENT ACCESSORS
577 =head2 $c->controller($name)
579 Gets a L<Catalyst::Controller> instance by name.
581 $c->controller('Foo')->do_stuff;
583 If the name is omitted, will return the controller for the dispatched
586 If you want to search for controllers, pass in a regexp as the argument.
588 # find all controllers that start with Foo
589 my @foo_controllers = $c->controller(qr{^Foo});
595 my ( $c, $name, @args ) = @_;
598 my @result = $c->_comp_search_prefixes( $name, qw/Controller C/ );
599 return map { $c->_filter_component( $_, @args ) } @result if ref $name;
600 return $c->_filter_component( $result[ 0 ], @args );
603 return $c->component( $c->action->class );
606 =head2 $c->model($name)
608 Gets a L<Catalyst::Model> instance by name.
610 $c->model('Foo')->do_stuff;
612 Any extra arguments are directly passed to ACCEPT_CONTEXT.
614 If the name is omitted, it will look for
615 - a model object in $c->stash->{current_model_instance}, then
616 - a model name in $c->stash->{current_model}, then
617 - a config setting 'default_model', or
618 - check if there is only one model, and return it if that's the case.
620 If you want to search for models, pass in a regexp as the argument.
622 # find all models that start with Foo
623 my @foo_models = $c->model(qr{^Foo});
628 my ( $c, $name, @args ) = @_;
631 my @result = $c->_comp_search_prefixes( $name, qw/Model M/ );
632 return map { $c->_filter_component( $_, @args ) } @result if ref $name;
633 return $c->_filter_component( $result[ 0 ], @args );
637 return $c->stash->{current_model_instance}
638 if $c->stash->{current_model_instance};
639 return $c->model( $c->stash->{current_model} )
640 if $c->stash->{current_model};
642 return $c->model( $c->config->{default_model} )
643 if $c->config->{default_model};
645 my( $comp, $rest ) = $c->_comp_search_prefixes( undef, qw/Model M/);
648 $c->log->warn( Carp::shortmess('Calling $c->model() will return a random model unless you specify one of:') );
649 $c->log->warn( '* $c->config->{default_model} # the name of the default model to use' );
650 $c->log->warn( '* $c->stash->{current_model} # the name of the model to use for this request' );
651 $c->log->warn( '* $c->stash->{current_model_instance} # the instance of the model to use for this request' );
652 $c->log->warn( 'NB: in version 5.81, the "random" behavior will not work at all.' );
655 return $c->_filter_component( $comp );
659 =head2 $c->view($name)
661 Gets a L<Catalyst::View> instance by name.
663 $c->view('Foo')->do_stuff;
665 Any extra arguments are directly passed to ACCEPT_CONTEXT.
667 If the name is omitted, it will look for
668 - a view object in $c->stash->{current_view_instance}, then
669 - a view name in $c->stash->{current_view}, then
670 - a config setting 'default_view', or
671 - check if there is only one view, and return it if that's the case.
673 If you want to search for views, pass in a regexp as the argument.
675 # find all views that start with Foo
676 my @foo_views = $c->view(qr{^Foo});
681 my ( $c, $name, @args ) = @_;
684 my @result = $c->_comp_search_prefixes( $name, qw/View V/ );
685 return map { $c->_filter_component( $_, @args ) } @result if ref $name;
686 return $c->_filter_component( $result[ 0 ], @args );
690 return $c->stash->{current_view_instance}
691 if $c->stash->{current_view_instance};
692 return $c->view( $c->stash->{current_view} )
693 if $c->stash->{current_view};
695 return $c->view( $c->config->{default_view} )
696 if $c->config->{default_view};
698 my( $comp, $rest ) = $c->_comp_search_prefixes( undef, qw/View V/);
701 $c->log->warn( 'Calling $c->view() will return a random view unless you specify one of:' );
702 $c->log->warn( '* $c->config->{default_view} # the name of the default view to use' );
703 $c->log->warn( '* $c->stash->{current_view} # the name of the view to use for this request' );
704 $c->log->warn( '* $c->stash->{current_view_instance} # the instance of the view to use for this request' );
705 $c->log->warn( 'NB: in version 5.81, the "random" behavior will not work at all.' );
708 return $c->_filter_component( $comp );
711 =head2 $c->controllers
713 Returns the available names which can be passed to $c->controller
719 return $c->_comp_names(qw/Controller C/);
724 Returns the available names which can be passed to $c->model
730 return $c->_comp_names(qw/Model M/);
736 Returns the available names which can be passed to $c->view
742 return $c->_comp_names(qw/View V/);
745 =head2 $c->comp($name)
747 =head2 $c->component($name)
749 Gets a component object by name. This method is not recommended,
750 unless you want to get a specific component by full
751 class. C<< $c->controller >>, C<< $c->model >>, and C<< $c->view >>
752 should be used instead.
754 If C<$name> is a regexp, a list of components matched against the full
755 component name will be returned.
760 my ( $c, $name, @args ) = @_;
763 my $comps = $c->components;
766 # is it the exact name?
767 return $c->_filter_component( $comps->{ $name }, @args )
768 if exists $comps->{ $name };
770 # perhaps we just omitted "MyApp"?
771 my $composed = ( ref $c || $c ) . "::${name}";
772 return $c->_filter_component( $comps->{ $composed }, @args )
773 if exists $comps->{ $composed };
775 # search all of the models, views and controllers
776 my( $comp ) = $c->_comp_search_prefixes( $name, qw/Model M Controller C View V/ );
777 return $c->_filter_component( $comp, @args ) if $comp;
780 # This is here so $c->comp( '::M::' ) works
781 my $query = ref $name ? $name : qr{$name}i;
783 my @result = grep { m{$query} } keys %{ $c->components };
784 return map { $c->_filter_component( $_, @args ) } @result if ref $name;
787 $c->log->warn( Carp::shortmess(qq(Found results for "${name}" using regexp fallback)) );
788 $c->log->warn( 'Relying on the regexp fallback behavior for component resolution' );
789 $c->log->warn( 'is unreliable and unsafe. You have been warned' );
790 return $c->_filter_component( $result[ 0 ], @args );
793 # I would expect to return an empty list here, but that breaks back-compat
797 return sort keys %{ $c->components };
800 =head2 CLASS DATA AND HELPER CLASSES
804 Returns or takes a hashref containing the application's configuration.
806 __PACKAGE__->config( { db => 'dsn:SQLite:foo.db' } );
808 You can also use a C<YAML>, C<XML> or C<Config::General> config file
809 like myapp.conf in your applications home directory. See
810 L<Catalyst::Plugin::ConfigLoader>.
812 =head3 Cascading configuration.
814 The config method is present on all Catalyst components, and configuration
815 will be merged when an application is started. Configuration loaded with
816 L<Catalyst::Plugin::ConfigLoader> takes precedence over other configuration,
817 followed by configuration in your top level C<MyApp> class. These two
818 configurations are merged, and then configuration data whose hash key matches a
819 component name is merged with configuration for that component.
821 The configuration for a component is then passed to the C<new> method when a
822 component is constructed.
826 MyApp->config({ 'Model::Foo' => { bar => 'baz', overrides => 'me' } });
827 MyApp::Model::Foo->config({ quux => 'frob', 'overrides => 'this' });
829 will mean that C<MyApp::Model::Foo> receives the following data when
832 MyApp::Model::Foo->new({
840 around config => sub {
844 croak('Setting config after setup has been run is not allowed.')
845 if ( @_ and $c->setup_finished );
852 Returns the logging object instance. Unless it is already set, Catalyst
853 sets this up with a L<Catalyst::Log> object. To use your own log class,
854 set the logger with the C<< __PACKAGE__->log >> method prior to calling
855 C<< __PACKAGE__->setup >>.
857 __PACKAGE__->log( MyLogger->new );
862 $c->log->info( 'Now logging with my own logger!' );
864 Your log class should implement the methods described in
870 Returns 1 if debug mode is enabled, 0 otherwise.
872 You can enable debug mode in several ways:
876 =item By calling myapp_server.pl with the -d flag
878 =item With the environment variables MYAPP_DEBUG, or CATALYST_DEBUG
880 =item The -Debug option in your MyApp.pm
882 =item By declaring C<sub debug { 1 }> in your MyApp.pm.
886 Calling C<< $c->debug(1) >> has no effect.
892 =head2 $c->dispatcher
894 Returns the dispatcher instance. See L<Catalyst::Dispatcher>.
898 Returns the engine instance. See L<Catalyst::Engine>.
901 =head2 UTILITY METHODS
903 =head2 $c->path_to(@path)
905 Merges C<@path> with C<< $c->config->{home} >> and returns a
906 L<Path::Class::Dir> object.
910 $c->path_to( 'db', 'sqlite.db' );
915 my ( $c, @path ) = @_;
916 my $path = Path::Class::Dir->new( $c->config->{home}, @path );
917 if ( -d $path ) { return $path }
918 else { return Path::Class::File->new( $c->config->{home}, @path ) }
921 =head2 $c->plugin( $name, $class, @args )
923 Helper method for plugins. It creates a class data accessor/mutator and
924 loads and instantiates the given class.
926 MyApp->plugin( 'prototype', 'HTML::Prototype' );
928 $c->prototype->define_javascript_functions;
930 B<Note:> This method of adding plugins is deprecated. The ability
931 to add plugins like this B<will be removed> in a Catalyst 5.81.
932 Please do not use this functionality in new code.
937 my ( $class, $name, $plugin, @args ) = @_;
939 # See block comment in t/unit_core_plugin.t
940 $class->log->warn(qq/Adding plugin using the ->plugin method is deprecated, and will be removed in Catalyst 5.81/);
942 $class->_register_plugin( $plugin, 1 );
944 eval { $plugin->import };
945 $class->mk_classdata($name);
947 eval { $obj = $plugin->new(@args) };
950 Catalyst::Exception->throw( message =>
951 qq/Couldn't instantiate instant plugin "$plugin", "$@"/ );
955 $class->log->debug(qq/Initialized instant plugin "$plugin" as "$name"/)
961 Initializes the dispatcher and engine, loads any plugins, and loads the
962 model, view, and controller components. You may also specify an array
963 of plugins to load here, if you choose to not load them in the C<use
967 MyApp->setup( qw/-Debug/ );
972 my ( $class, @arguments ) = @_;
973 croak('Running setup more than once')
974 if ( $class->setup_finished );
976 unless ( $class->isa('Catalyst') ) {
978 Catalyst::Exception->throw(
979 message => qq/'$class' does not inherit from Catalyst/ );
982 if ( $class->arguments ) {
983 @arguments = ( @arguments, @{ $class->arguments } );
989 foreach (@arguments) {
993 ( $flags->{log} ) ? 'debug,' . $flags->{log} : 'debug';
995 elsif (/^-(\w+)=?(.*)$/) {
996 $flags->{ lc $1 } = $2;
999 push @{ $flags->{plugins} }, $_;
1003 $class->setup_home( delete $flags->{home} );
1005 $class->setup_log( delete $flags->{log} );
1006 $class->setup_plugins( delete $flags->{plugins} );
1007 $class->setup_dispatcher( delete $flags->{dispatcher} );
1008 $class->setup_engine( delete $flags->{engine} );
1009 $class->setup_stats( delete $flags->{stats} );
1011 for my $flag ( sort keys %{$flags} ) {
1013 if ( my $code = $class->can( 'setup_' . $flag ) ) {
1014 &$code( $class, delete $flags->{$flag} );
1017 $class->log->warn(qq/Unknown flag "$flag"/);
1021 eval { require Catalyst::Devel; };
1022 if( !$@ && $ENV{CATALYST_SCRIPT_GEN} && ( $ENV{CATALYST_SCRIPT_GEN} < $Catalyst::Devel::CATALYST_SCRIPT_GEN ) ) {
1023 $class->log->warn(<<"EOF");
1024 You are running an old script!
1026 Please update by running (this will overwrite existing files):
1027 catalyst.pl -force -scripts $class
1029 or (this will not overwrite existing files):
1030 catalyst.pl -scripts $class
1035 if ( $class->debug ) {
1036 my @plugins = map { "$_ " . ( $_->VERSION || '' ) } $class->registered_plugins;
1039 my $column_width = Catalyst::Utils::term_width() - 6;
1040 my $t = Text::SimpleTable->new($column_width);
1041 $t->row($_) for @plugins;
1042 $class->log->debug( "Loaded plugins:\n" . $t->draw . "\n" );
1045 my $dispatcher = $class->dispatcher;
1046 my $engine = $class->engine;
1047 my $home = $class->config->{home};
1049 $class->log->debug(sprintf(q/Loaded dispatcher "%s"/, blessed($dispatcher)));
1050 $class->log->debug(sprintf(q/Loaded engine "%s"/, blessed($engine)));
1054 ? $class->log->debug(qq/Found home "$home"/)
1055 : $class->log->debug(qq/Home "$home" doesn't exist/)
1056 : $class->log->debug(q/Couldn't find home/);
1059 # Call plugins setup, this is stupid and evil.
1060 # Also screws C3 badly on 5.10, hack to avoid.
1062 no warnings qw/redefine/;
1063 local *setup = sub { };
1064 $class->setup unless $Catalyst::__AM_RESTARTING;
1067 # Initialize our data structure
1068 $class->components( {} );
1070 $class->setup_components;
1072 if ( $class->debug ) {
1073 my $column_width = Catalyst::Utils::term_width() - 8 - 9;
1074 my $t = Text::SimpleTable->new( [ $column_width, 'Class' ], [ 8, 'Type' ] );
1075 for my $comp ( sort keys %{ $class->components } ) {
1076 my $type = ref $class->components->{$comp} ? 'instance' : 'class';
1077 $t->row( $comp, $type );
1079 $class->log->debug( "Loaded components:\n" . $t->draw . "\n" )
1080 if ( keys %{ $class->components } );
1083 # Add our self to components, since we are also a component
1084 if( $class->isa('Catalyst::Controller') ){
1085 $class->components->{$class} = $class;
1088 $class->setup_actions;
1090 if ( $class->debug ) {
1091 my $name = $class->config->{name} || 'Application';
1092 $class->log->info("$name powered by Catalyst $Catalyst::VERSION");
1094 $class->log->_flush() if $class->log->can('_flush');
1096 # Make sure that the application class becomes immutable at this point,
1097 # which ensures that it gets an inlined constructor. This means that it
1098 # works even if the user has added a plugin which contains a new method.
1099 # Note however that we have to do the work on scope end, so that method
1100 # modifiers work correctly in MyApp (as you have to call setup _before_
1101 # applying modifiers).
1102 Scope::Upper::reap(sub {
1103 die $@ if $@; # This does not appear to do what you think it does.
1104 my $meta = Class::MOP::get_metaclass_by_name($class);
1105 if ( $meta->is_immutable && ! { $meta->immutable_options }->{inline_constructor} ) {
1106 die "You made your application class ($class) immutable, "
1107 . "but did not inline the constructor.\n"
1108 . "This will break catalyst, please pass "
1109 . "(replace_constructor => 1) when making your class immutable.\n";
1111 $meta->make_immutable(replace_constructor => 1) unless $meta->is_immutable;
1112 }, Scope::Upper::SCOPE(1));
1114 $class->setup_finalize;
1118 =head2 $app->setup_finalize
1120 A hook to attach modifiers to.
1121 Using C<< after setup => sub{}; >> doesn't work, because of quirky things done for plugin setup.
1122 Also better than C< setup_finished(); >, as that is a getter method.
1124 sub setup_finalize {
1128 ## do stuff, i.e., determine a primary key column for sessions stored in a DB
1130 $app->next::method(@_);
1137 sub setup_finalize {
1139 $class->setup_finished(1);
1142 =head2 $c->uri_for( $action, \@captures?, @args?, \%query_values? )
1144 =head2 $c->uri_for( $path, @args?, \%query_values? )
1150 A Catalyst::Action object representing the Catalyst action you want to
1151 create a URI for. To get one for an action in the current controller,
1152 use C<< $c->action('someactionname') >>. To get one from different
1153 controller, fetch the controller using C<< $c->controller() >>, then
1154 call C<action_for> on it.
1156 You can maintain the arguments captured by an action (e.g.: Regex, Chained)
1157 using C<< $c->req->captures >>.
1159 # For the current action
1160 $c->uri_for($c->action, $c->req->captures);
1162 # For the Foo action in the Bar controller
1163 $c->uri_for($c->controller->('Bar')->action_for('Foo'), $c->req->captures);
1170 my ( $c, $path, @args ) = @_;
1172 if ( blessed($path) ) { # action object
1173 my $captures = ( scalar @args && ref $args[0] eq 'ARRAY'
1177 $path = $c->dispatcher->uri_for_action($action, $captures);
1178 if (not defined $path) {
1179 $c->log->debug(qq/Can't find uri_for action '$action' @$captures/)
1183 $path = '/' if $path eq '';
1186 undef($path) if (defined $path && $path eq '');
1189 ( scalar @args && ref $args[$#args] eq 'HASH' ? pop @args : {} );
1191 carp "uri_for called with undef argument" if grep { ! defined $_ } @args;
1192 s/([^$URI::uric])/$URI::Escape::escapes{$1}/go for @args;
1194 unshift(@args, $path);
1196 unless (defined $path && $path =~ s!^/!!) { # in-place strip
1197 my $namespace = $c->namespace;
1198 if (defined $path) { # cheesy hack to handle path '../foo'
1199 $namespace =~ s{(?:^|/)[^/]+$}{} while $args[0] =~ s{^\.\./}{};
1201 unshift(@args, $namespace || '');
1204 # join args with '/', or a blank string
1205 my $args = join('/', grep { defined($_) } @args);
1206 $args =~ s/\?/%3F/g; # STUPID STUPID SPECIAL CASE
1208 my $base = $c->req->base;
1209 my $class = ref($base);
1210 $base =~ s{(?<!/)$}{/};
1214 if (my @keys = keys %$params) {
1215 # somewhat lifted from URI::_query's query_form
1216 $query = '?'.join('&', map {
1217 my $val = $params->{$_};
1218 s/([;\/?:@&=+,\$\[\]%])/$URI::Escape::escapes{$1}/go;
1221 $val = '' unless defined $val;
1224 utf8::encode( $_ ) if utf8::is_utf8($_);
1225 # using the URI::Escape pattern here so utf8 chars survive
1226 s/([^A-Za-z0-9\-_.!~*'() ])/$URI::Escape::escapes{$1}/go;
1228 "${key}=$_"; } ( ref $val eq 'ARRAY' ? @$val : $val ));
1232 my $res = bless(\"${base}${args}${query}", $class);
1236 =head2 $c->uri_for_action( $path, \@captures?, @args?, \%query_values? )
1238 =head2 $c->uri_for_action( $action, \@captures?, @args?, \%query_values? )
1244 A private path to the Catalyst action you want to create a URI for.
1246 This is a shortcut for calling C<< $c->dispatcher->get_action_by_path($path)
1247 >> and passing the resulting C<$action> and the remaining arguments to C<<
1250 You can also pass in a Catalyst::Action object, in which case it is passed to
1257 sub uri_for_action {
1258 my ( $c, $path, @args ) = @_;
1259 my $action = blessed($path)
1261 : $c->dispatcher->get_action_by_path($path);
1262 unless (defined $action) {
1263 croak "Can't find action for path '$path'";
1265 return $c->uri_for( $action, @args );
1268 =head2 $c->welcome_message
1270 Returns the Catalyst welcome HTML page.
1274 sub welcome_message {
1276 my $name = $c->config->{name};
1277 my $logo = $c->uri_for('/static/images/catalyst_logo.png');
1278 my $prefix = Catalyst::Utils::appprefix( ref $c );
1279 $c->response->content_type('text/html; charset=utf-8');
1281 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
1282 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
1283 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
1285 <meta http-equiv="Content-Language" content="en" />
1286 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
1287 <title>$name on Catalyst $VERSION</title>
1288 <style type="text/css">
1291 background-color: #eee;
1298 margin-bottom: 10px;
1300 background-color: #ccc;
1301 border: 1px solid #aaa;
1306 font-family: verdana, tahoma, sans-serif;
1309 font-family: verdana, tahoma, sans-serif;
1312 text-decoration: none;
1314 border-bottom: 1px dotted #bbb;
1316 :link:hover, :visited:hover {
1329 background-color: #fff;
1330 border: 1px solid #aaa;
1334 font-weight: normal;
1356 <h1><span id="appname">$name</span> on <a href="http://catalyst.perl.org">Catalyst</a>
1361 <img src="$logo" alt="Catalyst Logo" />
1363 <p>Welcome to the world of Catalyst.
1364 This <a href="http://en.wikipedia.org/wiki/MVC">MVC</a>
1365 framework will make web development something you had
1366 never expected it to be: Fun, rewarding, and quick.</p>
1367 <h2>What to do now?</h2>
1368 <p>That really depends on what <b>you</b> want to do.
1369 We do, however, provide you with a few starting points.</p>
1370 <p>If you want to jump right into web development with Catalyst
1371 you might want to start with a tutorial.</p>
1372 <pre>perldoc <a href="http://cpansearch.perl.org/dist/Catalyst-Manual/lib/Catalyst/Manual/Tutorial.pod">Catalyst::Manual::Tutorial</a></code>
1374 <p>Afterwards you can go on to check out a more complete look at our features.</p>
1376 <code>perldoc <a href="http://cpansearch.perl.org/dist/Catalyst-Manual/lib/Catalyst/Manual/Intro.pod">Catalyst::Manual::Intro</a>
1377 <!-- Something else should go here, but the Catalyst::Manual link seems unhelpful -->
1379 <h2>What to do next?</h2>
1380 <p>Next it's time to write an actual application. Use the
1381 helper scripts to generate <a href="http://cpansearch.perl.org/search?query=Catalyst%3A%3AController%3A%3A&mode=all">controllers</a>,
1382 <a href="http://cpansearch.perl.org/search?query=Catalyst%3A%3AModel%3A%3A&mode=all">models</a>, and
1383 <a href="http://cpansearch.perl.org/search?query=Catalyst%3A%3AView%3A%3A&mode=all">views</a>;
1384 they can save you a lot of work.</p>
1385 <pre><code>script/${prefix}_create.pl -help</code></pre>
1386 <p>Also, be sure to check out the vast and growing
1387 collection of <a href="http://search.cpan.org/search?query=Catalyst">plugins for Catalyst on CPAN</a>;
1388 you are likely to find what you need there.
1392 <p>Catalyst has a very active community. Here are the main places to
1393 get in touch with us.</p>
1396 <a href="http://dev.catalyst.perl.org">Wiki</a>
1399 <a href="http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/catalyst">Mailing-List</a>
1402 <a href="irc://irc.perl.org/catalyst">IRC channel #catalyst on irc.perl.org</a>
1405 <h2>In conclusion</h2>
1406 <p>The Catalyst team hopes you will enjoy using Catalyst as much
1407 as we enjoyed making it. Please contact us if you have ideas
1408 for improvement or other feedback.</p>
1416 =head1 INTERNAL METHODS
1418 These methods are not meant to be used by end users.
1420 =head2 $c->components
1422 Returns a hash of components.
1424 =head2 $c->context_class
1426 Returns or sets the context class.
1430 Returns a hashref containing coderefs and execution counts (needed for
1431 deep recursion detection).
1435 Returns the number of actions on the current internal execution stack.
1439 Dispatches a request to actions.
1443 sub dispatch { my $c = shift; $c->dispatcher->dispatch( $c, @_ ) }
1445 =head2 $c->dispatcher_class
1447 Returns or sets the dispatcher class.
1449 =head2 $c->dump_these
1451 Returns a list of 2-element array references (name, structure) pairs
1452 that will be dumped on the error page in debug mode.
1458 [ Request => $c->req ],
1459 [ Response => $c->res ],
1460 [ Stash => $c->stash ],
1461 [ Config => $c->config ];
1464 =head2 $c->engine_class
1466 Returns or sets the engine class.
1468 =head2 $c->execute( $class, $coderef )
1470 Execute a coderef in given class and catch exceptions. Errors are available
1476 my ( $c, $class, $code ) = @_;
1477 $class = $c->component($class) || $class;
1480 if ( $c->depth >= $RECURSION ) {
1481 my $action = $code->reverse();
1482 $action = "/$action" unless $action =~ /->/;
1483 my $error = qq/Deep recursion detected calling "${action}"/;
1484 $c->log->error($error);
1490 my $stats_info = $c->_stats_start_execute( $code ) if $c->use_stats;
1492 push( @{ $c->stack }, $code );
1494 no warnings 'recursion';
1495 eval { $c->state( $code->execute( $class, $c, @{ $c->req->args } ) || 0 ) };
1497 $c->_stats_finish_execute( $stats_info ) if $c->use_stats and $stats_info;
1499 my $last = pop( @{ $c->stack } );
1501 if ( my $error = $@ ) {
1502 if ( !ref($error) and $error eq $DETACH ) {
1503 die $DETACH if($c->depth > 1);
1505 elsif ( !ref($error) and $error eq $GO ) {
1506 die $GO if($c->depth > 0);
1509 unless ( ref $error ) {
1510 no warnings 'uninitialized';
1512 my $class = $last->class;
1513 my $name = $last->name;
1514 $error = qq/Caught exception in $class->$name "$error"/;
1523 sub _stats_start_execute {
1524 my ( $c, $code ) = @_;
1526 return if ( ( $code->name =~ /^_.*/ )
1527 && ( !$c->config->{show_internal_actions} ) );
1529 my $action_name = $code->reverse();
1530 $c->counter->{$action_name}++;
1532 my $action = $action_name;
1533 $action = "/$action" unless $action =~ /->/;
1535 # determine if the call was the result of a forward
1536 # this is done by walking up the call stack and looking for a calling
1537 # sub of Catalyst::forward before the eval
1539 for my $index ( 2 .. 11 ) {
1541 if ( ( caller($index) )[0] eq 'Catalyst'
1542 && ( caller($index) )[3] eq '(eval)' );
1544 if ( ( caller($index) )[3] =~ /forward$/ ) {
1545 $callsub = ( caller($index) )[3];
1546 $action = "-> $action";
1551 my $uid = $action_name . $c->counter->{$action_name};
1553 # is this a root-level call or a forwarded call?
1554 if ( $callsub =~ /forward$/ ) {
1556 # forward, locate the caller
1557 if ( my $parent = $c->stack->[-1] ) {
1560 parent => "$parent" . $c->counter->{"$parent"},
1566 # forward with no caller may come from a plugin
1585 sub _stats_finish_execute {
1586 my ( $c, $info ) = @_;
1587 $c->stats->profile( end => $info );
1590 =head2 $c->_localize_fields( sub { }, \%keys );
1594 #Why does this exist? This is no longer safe and WILL NOT WORK.
1595 # it doesnt seem to be used anywhere. can we remove it?
1596 sub _localize_fields {
1597 my ( $c, $localized, $code ) = ( @_ );
1599 my $request = delete $localized->{request} || {};
1600 my $response = delete $localized->{response} || {};
1602 local @{ $c }{ keys %$localized } = values %$localized;
1603 local @{ $c->request }{ keys %$request } = values %$request;
1604 local @{ $c->response }{ keys %$response } = values %$response;
1611 Finalizes the request.
1618 for my $error ( @{ $c->error } ) {
1619 $c->log->error($error);
1622 # Allow engine to handle finalize flow (for POE)
1623 my $engine = $c->engine;
1624 if ( my $code = $engine->can('finalize') ) {
1629 $c->finalize_uploads;
1632 if ( $#{ $c->error } >= 0 ) {
1636 $c->finalize_headers;
1639 if ( $c->request->method eq 'HEAD' ) {
1640 $c->response->body('');
1646 if ($c->use_stats) {
1647 my $elapsed = sprintf '%f', $c->stats->elapsed;
1648 my $av = $elapsed == 0 ? '??' : sprintf '%.3f', 1 / $elapsed;
1650 "Request took ${elapsed}s ($av/s)\n" . $c->stats->report . "\n" );
1653 return $c->response->status;
1656 =head2 $c->finalize_body
1662 sub finalize_body { my $c = shift; $c->engine->finalize_body( $c, @_ ) }
1664 =head2 $c->finalize_cookies
1670 sub finalize_cookies { my $c = shift; $c->engine->finalize_cookies( $c, @_ ) }
1672 =head2 $c->finalize_error
1678 sub finalize_error { my $c = shift; $c->engine->finalize_error( $c, @_ ) }
1680 =head2 $c->finalize_headers
1686 sub finalize_headers {
1689 my $response = $c->response; #accessor calls can add up?
1691 # Check if we already finalized headers
1692 return if $response->finalized_headers;
1695 if ( my $location = $response->redirect ) {
1696 $c->log->debug(qq/Redirecting to "$location"/) if $c->debug;
1697 $response->header( Location => $location );
1699 if ( !$response->has_body ) {
1700 # Add a default body if none is already present
1702 qq{<html><body><p>This item has moved <a href="$location">here</a>.</p></body></html>}
1708 if ( $response->body && !$response->content_length ) {
1710 # get the length from a filehandle
1711 if ( blessed( $response->body ) && $response->body->can('read') )
1713 my $stat = stat $response->body;
1714 if ( $stat && $stat->size > 0 ) {
1715 $response->content_length( $stat->size );
1718 $c->log->warn('Serving filehandle without a content-length');
1722 # everything should be bytes at this point, but just in case
1723 $response->content_length( bytes::length( $response->body ) );
1728 if ( $response->status =~ /^(1\d\d|[23]04)$/ ) {
1729 $response->headers->remove_header("Content-Length");
1730 $response->body('');
1733 $c->finalize_cookies;
1735 $c->engine->finalize_headers( $c, @_ );
1738 $response->finalized_headers(1);
1741 =head2 $c->finalize_output
1743 An alias for finalize_body.
1745 =head2 $c->finalize_read
1747 Finalizes the input after reading is complete.
1751 sub finalize_read { my $c = shift; $c->engine->finalize_read( $c, @_ ) }
1753 =head2 $c->finalize_uploads
1755 Finalizes uploads. Cleans up any temporary files.
1759 sub finalize_uploads { my $c = shift; $c->engine->finalize_uploads( $c, @_ ) }
1761 =head2 $c->get_action( $action, $namespace )
1763 Gets an action in a given namespace.
1767 sub get_action { my $c = shift; $c->dispatcher->get_action(@_) }
1769 =head2 $c->get_actions( $action, $namespace )
1771 Gets all actions of a given name in a namespace and all parent
1776 sub get_actions { my $c = shift; $c->dispatcher->get_actions( $c, @_ ) }
1778 =head2 $c->handle_request( $class, @arguments )
1780 Called to handle each HTTP request.
1784 sub handle_request {
1785 my ( $class, @arguments ) = @_;
1787 # Always expect worst case!
1790 if ($class->debug) {
1791 my $secs = time - $START || 1;
1792 my $av = sprintf '%.3f', $COUNT / $secs;
1793 my $time = localtime time;
1794 $class->log->info("*** Request $COUNT ($av/s) [$$] [$time] ***");
1797 my $c = $class->prepare(@arguments);
1799 $status = $c->finalize;
1802 if ( my $error = $@ ) {
1804 $class->log->error(qq/Caught exception in engine "$error"/);
1809 if(my $coderef = $class->log->can('_flush')){
1810 $class->log->$coderef();
1815 =head2 $c->prepare( @arguments )
1817 Creates a Catalyst context from an engine-specific request (Apache, CGI,
1823 my ( $class, @arguments ) = @_;
1826 # After the app/ctxt split, this should become an attribute based on something passed
1827 # into the application.
1828 $class->context_class( ref $class || $class ) unless $class->context_class;
1830 my $c = $class->context_class->new({});
1832 # For on-demand data
1833 $c->request->_context($c);
1834 $c->response->_context($c);
1836 #surely this is not the most efficient way to do things...
1837 $c->stats($class->stats_class->new)->enable($c->use_stats);
1839 $c->res->headers->header( 'X-Catalyst' => $Catalyst::VERSION );
1842 #XXX reuse coderef from can
1843 # Allow engine to direct the prepare flow (for POE)
1844 if ( $c->engine->can('prepare') ) {
1845 $c->engine->prepare( $c, @arguments );
1848 $c->prepare_request(@arguments);
1849 $c->prepare_connection;
1850 $c->prepare_query_parameters;
1851 $c->prepare_headers;
1852 $c->prepare_cookies;
1855 # Prepare the body for reading, either by prepare_body
1856 # or the user, if they are using $c->read
1859 # Parse the body unless the user wants it on-demand
1860 unless ( $c->config->{parse_on_demand} ) {
1865 my $method = $c->req->method || '';
1866 my $path = $c->req->path;
1867 $path = '/' unless length $path;
1868 my $address = $c->req->address || '';
1870 $c->log->debug(qq/"$method" request for "$path" from "$address"/)
1878 =head2 $c->prepare_action
1880 Prepares action. See L<Catalyst::Dispatcher>.
1884 sub prepare_action { my $c = shift; $c->dispatcher->prepare_action( $c, @_ ) }
1886 =head2 $c->prepare_body
1888 Prepares message body.
1895 return if $c->request->_has_body;
1897 # Initialize on-demand data
1898 $c->engine->prepare_body( $c, @_ );
1899 $c->prepare_parameters;
1900 $c->prepare_uploads;
1902 if ( $c->debug && keys %{ $c->req->body_parameters } ) {
1903 my $t = Text::SimpleTable->new( [ 35, 'Parameter' ], [ 36, 'Value' ] );
1904 for my $key ( sort keys %{ $c->req->body_parameters } ) {
1905 my $param = $c->req->body_parameters->{$key};
1906 my $value = defined($param) ? $param : '';
1908 ref $value eq 'ARRAY' ? ( join ', ', @$value ) : $value );
1910 $c->log->debug( "Body Parameters are:\n" . $t->draw );
1914 =head2 $c->prepare_body_chunk( $chunk )
1916 Prepares a chunk of data before sending it to L<HTTP::Body>.
1918 See L<Catalyst::Engine>.
1922 sub prepare_body_chunk {
1924 $c->engine->prepare_body_chunk( $c, @_ );
1927 =head2 $c->prepare_body_parameters
1929 Prepares body parameters.
1933 sub prepare_body_parameters {
1935 $c->engine->prepare_body_parameters( $c, @_ );
1938 =head2 $c->prepare_connection
1940 Prepares connection.
1944 sub prepare_connection {
1946 $c->engine->prepare_connection( $c, @_ );
1949 =head2 $c->prepare_cookies
1955 sub prepare_cookies { my $c = shift; $c->engine->prepare_cookies( $c, @_ ) }
1957 =head2 $c->prepare_headers
1963 sub prepare_headers { my $c = shift; $c->engine->prepare_headers( $c, @_ ) }
1965 =head2 $c->prepare_parameters
1967 Prepares parameters.
1971 sub prepare_parameters {
1973 $c->prepare_body_parameters;
1974 $c->engine->prepare_parameters( $c, @_ );
1977 =head2 $c->prepare_path
1979 Prepares path and base.
1983 sub prepare_path { my $c = shift; $c->engine->prepare_path( $c, @_ ) }
1985 =head2 $c->prepare_query_parameters
1987 Prepares query parameters.
1991 sub prepare_query_parameters {
1994 $c->engine->prepare_query_parameters( $c, @_ );
1996 if ( $c->debug && keys %{ $c->request->query_parameters } ) {
1997 my $t = Text::SimpleTable->new( [ 35, 'Parameter' ], [ 36, 'Value' ] );
1998 for my $key ( sort keys %{ $c->req->query_parameters } ) {
1999 my $param = $c->req->query_parameters->{$key};
2000 my $value = defined($param) ? $param : '';
2002 ref $value eq 'ARRAY' ? ( join ', ', @$value ) : $value );
2004 $c->log->debug( "Query Parameters are:\n" . $t->draw );
2008 =head2 $c->prepare_read
2010 Prepares the input for reading.
2014 sub prepare_read { my $c = shift; $c->engine->prepare_read( $c, @_ ) }
2016 =head2 $c->prepare_request
2018 Prepares the engine request.
2022 sub prepare_request { my $c = shift; $c->engine->prepare_request( $c, @_ ) }
2024 =head2 $c->prepare_uploads
2030 sub prepare_uploads {
2033 $c->engine->prepare_uploads( $c, @_ );
2035 if ( $c->debug && keys %{ $c->request->uploads } ) {
2036 my $t = Text::SimpleTable->new(
2037 [ 12, 'Parameter' ],
2042 for my $key ( sort keys %{ $c->request->uploads } ) {
2043 my $upload = $c->request->uploads->{$key};
2044 for my $u ( ref $upload eq 'ARRAY' ? @{$upload} : ($upload) ) {
2045 $t->row( $key, $u->filename, $u->type, $u->size );
2048 $c->log->debug( "File Uploads are:\n" . $t->draw );
2052 =head2 $c->prepare_write
2054 Prepares the output for writing.
2058 sub prepare_write { my $c = shift; $c->engine->prepare_write( $c, @_ ) }
2060 =head2 $c->request_class
2062 Returns or sets the request class.
2064 =head2 $c->response_class
2066 Returns or sets the response class.
2068 =head2 $c->read( [$maxlength] )
2070 Reads a chunk of data from the request body. This method is designed to
2071 be used in a while loop, reading C<$maxlength> bytes on every call.
2072 C<$maxlength> defaults to the size of the request if not specified.
2074 You have to set C<< MyApp->config->{parse_on_demand} >> to use this
2077 Warning: If you use read(), Catalyst will not process the body,
2078 so you will not be able to access POST parameters or file uploads via
2079 $c->request. You must handle all body parsing yourself.
2083 sub read { my $c = shift; return $c->engine->read( $c, @_ ) }
2091 sub run { my $c = shift; return $c->engine->run( $c, @_ ) }
2093 =head2 $c->set_action( $action, $code, $namespace, $attrs )
2095 Sets an action in a given namespace.
2099 sub set_action { my $c = shift; $c->dispatcher->set_action( $c, @_ ) }
2101 =head2 $c->setup_actions($component)
2103 Sets up actions for a component.
2107 sub setup_actions { my $c = shift; $c->dispatcher->setup_actions( $c, @_ ) }
2109 =head2 $c->setup_components
2111 Sets up components. Specify a C<setup_components> config option to pass
2112 additional options directly to L<Module::Pluggable>. To add additional
2113 search paths, specify a key named C<search_extra> as an array
2114 reference. Items in the array beginning with C<::> will have the
2115 application class name prepended to them.
2117 All components found will also have any
2118 L<Devel::InnerPackage|inner packages> loaded and set up as components.
2119 Note, that modules which are B<not> an I<inner package> of the main
2120 file namespace loaded will not be instantiated as components.
2124 sub setup_components {
2127 my @paths = qw( ::Controller ::C ::Model ::M ::View ::V );
2128 my $config = $class->config->{ setup_components };
2129 my $extra = delete $config->{ search_extra } || [];
2131 push @paths, @$extra;
2133 my $locator = Module::Pluggable::Object->new(
2134 search_path => [ map { s/^(?=::)/$class/; $_; } @paths ],
2138 my @comps = sort { length $a <=> length $b } $locator->plugins;
2139 my %comps = map { $_ => 1 } @comps;
2141 my $deprecated_component_names = grep { /::[CMV]::/ } @comps;
2142 $class->log->warn(qq{Your application is using the deprecated ::[MVC]:: type naming scheme.\n}.
2143 qq{Please switch your class names to ::Model::, ::View:: and ::Controller: as appropriate.\n}
2144 ) if $deprecated_component_names;
2146 for my $component ( @comps ) {
2148 # We pass ignore_loaded here so that overlay files for (e.g.)
2149 # Model::DBI::Schema sub-classes are loaded - if it's in @comps
2150 # we know M::P::O found a file on disk so this is safe
2152 Catalyst::Utils::ensure_class_loaded( $component, { ignore_loaded => 1 } );
2153 #Class::MOP::load_class($component);
2155 my $module = $class->setup_component( $component );
2157 $component => $module,
2159 $_ => $class->setup_component( $_ )
2161 not exists $comps{$_}
2162 } Devel::InnerPackage::list_packages( $component )
2165 for my $key ( keys %modules ) {
2166 $class->components->{ $key } = $modules{ $key };
2171 =head2 $c->setup_component
2175 sub _controller_init_base_classes {
2176 my ($app_class, $component) = @_;
2177 foreach my $class ( reverse @{ mro::get_linear_isa($component) } ) {
2178 Moose->init_meta( for_class => $class )
2179 unless find_meta($class);
2183 sub setup_component {
2184 my( $class, $component ) = @_;
2186 unless ( $component->can( 'COMPONENT' ) ) {
2190 # FIXME - Ugly, ugly hack to ensure the we force initialize non-moose base classes
2191 # nearest to Catalyst::Controller first, no matter what order stuff happens
2192 # to be loaded. There are TODO tests in Moose for this, see
2193 # f2391d17574eff81d911b97be15ea51080500003
2194 if ($component->isa('Catalyst::Controller')) {
2195 $class->_controller_init_base_classes($component);
2198 my $suffix = Catalyst::Utils::class2classsuffix( $component );
2199 my $config = $class->config->{ $suffix } || {};
2201 my $instance = eval { $component->COMPONENT( $class, $config ); };
2203 if ( my $error = $@ ) {
2205 Catalyst::Exception->throw(
2206 message => qq/Couldn't instantiate component "$component", "$error"/
2210 unless (blessed $instance) {
2211 my $metaclass = Moose::Util::find_meta($component);
2212 my $method_meta = $metaclass->find_method_by_name('COMPONENT');
2213 my $component_method_from = $method_meta->associated_metaclass->name;
2214 my $value = defined($instance) ? $instance : 'undef';
2215 Catalyst::Exception->throw(
2217 qq/Couldn't instantiate component "$component", COMPONENT() method (from $component_method_from) didn't return an object-like value (value was $value)./
2223 =head2 $c->setup_dispatcher
2229 sub setup_dispatcher {
2230 my ( $class, $dispatcher ) = @_;
2233 $dispatcher = 'Catalyst::Dispatcher::' . $dispatcher;
2236 if ( my $env = Catalyst::Utils::env_value( $class, 'DISPATCHER' ) ) {
2237 $dispatcher = 'Catalyst::Dispatcher::' . $env;
2240 unless ($dispatcher) {
2241 $dispatcher = $class->dispatcher_class;
2244 Class::MOP::load_class($dispatcher);
2246 # dispatcher instance
2247 $class->dispatcher( $dispatcher->new );
2250 =head2 $c->setup_engine
2257 my ( $class, $engine ) = @_;
2260 $engine = 'Catalyst::Engine::' . $engine;
2263 if ( my $env = Catalyst::Utils::env_value( $class, 'ENGINE' ) ) {
2264 $engine = 'Catalyst::Engine::' . $env;
2267 if ( $ENV{MOD_PERL} ) {
2268 my $meta = Class::MOP::get_metaclass_by_name($class);
2270 # create the apache method
2271 $meta->add_method('apache' => sub { shift->engine->apache });
2273 my ( $software, $version ) =
2274 $ENV{MOD_PERL} =~ /^(\S+)\/(\d+(?:[\.\_]\d+)+)/;
2277 $version =~ s/(\.[^.]+)\./$1/g;
2279 if ( $software eq 'mod_perl' ) {
2283 if ( $version >= 1.99922 ) {
2284 $engine = 'Catalyst::Engine::Apache2::MP20';
2287 elsif ( $version >= 1.9901 ) {
2288 $engine = 'Catalyst::Engine::Apache2::MP19';
2291 elsif ( $version >= 1.24 ) {
2292 $engine = 'Catalyst::Engine::Apache::MP13';
2296 Catalyst::Exception->throw( message =>
2297 qq/Unsupported mod_perl version: $ENV{MOD_PERL}/ );
2302 # install the correct mod_perl handler
2303 if ( $version >= 1.9901 ) {
2304 *handler = sub : method {
2305 shift->handle_request(@_);
2309 *handler = sub ($$) { shift->handle_request(@_) };
2314 elsif ( $software eq 'Zeus-Perl' ) {
2315 $engine = 'Catalyst::Engine::Zeus';
2319 Catalyst::Exception->throw(
2320 message => qq/Unsupported mod_perl: $ENV{MOD_PERL}/ );
2325 $engine = $class->engine_class;
2328 Class::MOP::load_class($engine);
2330 # check for old engines that are no longer compatible
2332 if ( $engine->isa('Catalyst::Engine::Apache')
2333 && !Catalyst::Engine::Apache->VERSION )
2338 elsif ( $engine->isa('Catalyst::Engine::Server::Base')
2339 && Catalyst::Engine::Server->VERSION le '0.02' )
2344 elsif ($engine->isa('Catalyst::Engine::HTTP::POE')
2345 && $engine->VERSION eq '0.01' )
2350 elsif ($engine->isa('Catalyst::Engine::Zeus')
2351 && $engine->VERSION eq '0.01' )
2357 Catalyst::Exception->throw( message =>
2358 qq/Engine "$engine" is not supported by this version of Catalyst/
2363 $class->engine( $engine->new );
2366 =head2 $c->setup_home
2368 Sets up the home directory.
2373 my ( $class, $home ) = @_;
2375 if ( my $env = Catalyst::Utils::env_value( $class, 'HOME' ) ) {
2379 $home ||= Catalyst::Utils::home($class);
2382 #I remember recently being scolded for assigning config values like this
2383 $class->config->{home} ||= $home;
2384 $class->config->{root} ||= Path::Class::Dir->new($home)->subdir('root');
2388 =head2 $c->setup_log
2390 Sets up log by instantiating a L<Catalyst::Log|Catalyst::Log> object and
2391 passing it to C<log()>. Pass in a comma-delimited list of levels to set the
2394 This method also installs a C<debug> method that returns a true value into the
2395 catalyst subclass if the "debug" level is passed in the comma-delimited list,
2396 or if the C<$CATALYST_DEBUG> environment variable is set to a true value.
2398 Note that if the log has already been setup, by either a previous call to
2399 C<setup_log> or by a call such as C<< __PACKAGE__->log( MyLogger->new ) >>,
2400 that this method won't actually set up the log object.
2405 my ( $class, $levels ) = @_;
2408 $levels =~ s/^\s+//;
2409 $levels =~ s/\s+$//;
2410 my %levels = map { $_ => 1 } split /\s*,\s*/, $levels;
2412 my $env_debug = Catalyst::Utils::env_value( $class, 'DEBUG' );
2413 if ( defined $env_debug ) {
2414 $levels{debug} = 1 if $env_debug; # Ugly!
2415 delete($levels{debug}) unless $env_debug;
2418 unless ( $class->log ) {
2419 $class->log( Catalyst::Log->new(keys %levels) );
2422 if ( $levels{debug} ) {
2423 Class::MOP::get_metaclass_by_name($class)->add_method('debug' => sub { 1 });
2424 $class->log->debug('Debug messages enabled');
2428 =head2 $c->setup_plugins
2434 =head2 $c->setup_stats
2436 Sets up timing statistics class.
2441 my ( $class, $stats ) = @_;
2443 Catalyst::Utils::ensure_class_loaded($class->stats_class);
2445 my $env = Catalyst::Utils::env_value( $class, 'STATS' );
2446 if ( defined($env) ? $env : ($stats || $class->debug ) ) {
2447 Class::MOP::get_metaclass_by_name($class)->add_method('use_stats' => sub { 1 });
2448 $class->log->debug('Statistics enabled');
2453 =head2 $c->registered_plugins
2455 Returns a sorted list of the plugins which have either been stated in the
2456 import list or which have been added via C<< MyApp->plugin(@args); >>.
2458 If passed a given plugin name, it will report a boolean value indicating
2459 whether or not that plugin is loaded. A fully qualified name is required if
2460 the plugin name does not begin with C<Catalyst::Plugin::>.
2462 if ($c->registered_plugins('Some::Plugin')) {
2470 sub registered_plugins {
2472 return sort keys %{ $proto->_plugins } unless @_;
2474 return 1 if exists $proto->_plugins->{$plugin};
2475 return exists $proto->_plugins->{"Catalyst::Plugin::$plugin"};
2478 sub _register_plugin {
2479 my ( $proto, $plugin, $instant ) = @_;
2480 my $class = ref $proto || $proto;
2482 # no ignore_loaded here, the plugin may already have been
2483 # defined in memory and we don't want to error on "no file" if so
2485 Class::MOP::load_class( $plugin );
2487 $proto->_plugins->{$plugin} = 1;
2490 if ( my $meta = Class::MOP::get_metaclass_by_name($class) ) {
2491 my @superclasses = ($plugin, $meta->superclasses );
2492 $meta->superclasses(@superclasses);
2494 unshift @{"$class\::ISA"}, $plugin;
2501 my ( $class, $plugins ) = @_;
2503 $class->_plugins( {} ) unless $class->_plugins;
2505 for my $plugin ( reverse @$plugins ) {
2507 unless ( $plugin =~ s/\A\+// ) {
2508 $plugin = "Catalyst::Plugin::$plugin";
2511 $class->_register_plugin($plugin);
2518 Returns an arrayref of the internal execution stack (actions that are
2519 currently executing).
2521 =head2 $c->stats_class
2523 Returns or sets the stats (timing statistics) class.
2525 =head2 $c->use_stats
2527 Returns 1 when stats collection is enabled. Stats collection is enabled
2528 when the -Stats options is set, debug is on or when the <MYAPP>_STATS
2529 environment variable is set.
2531 Note that this is a static method, not an accessor and should be overridden
2532 by declaring C<sub use_stats { 1 }> in your MyApp.pm, not by calling C<< $c->use_stats(1) >>.
2539 =head2 $c->write( $data )
2541 Writes $data to the output stream. When using this method directly, you
2542 will need to manually set the C<Content-Length> header to the length of
2543 your output data, if known.
2550 # Finalize headers if someone manually writes output
2551 $c->finalize_headers;
2553 return $c->engine->write( $c, @_ );
2558 Returns the Catalyst version number. Mostly useful for "powered by"
2559 messages in template systems.
2563 sub version { return $Catalyst::VERSION }
2565 =head1 INTERNAL ACTIONS
2567 Catalyst uses internal actions like C<_DISPATCH>, C<_BEGIN>, C<_AUTO>,
2568 C<_ACTION>, and C<_END>. These are by default not shown in the private
2569 action table, but you can make them visible with a config parameter.
2571 MyApp->config->{show_internal_actions} = 1;
2573 =head1 CASE SENSITIVITY
2575 By default Catalyst is not case sensitive, so C<MyApp::C::FOO::Bar> is
2576 mapped to C</foo/bar>. You can activate case sensitivity with a config
2579 MyApp->config->{case_sensitive} = 1;
2581 This causes C<MyApp::C::Foo::Bar> to map to C</Foo/Bar>.
2583 =head1 ON-DEMAND PARSER
2585 The request body is usually parsed at the beginning of a request,
2586 but if you want to handle input yourself, you can enable on-demand
2587 parsing with a config parameter.
2589 MyApp->config->{parse_on_demand} = 1;
2591 =head1 PROXY SUPPORT
2593 Many production servers operate using the common double-server approach,
2594 with a lightweight frontend web server passing requests to a larger
2595 backend server. An application running on the backend server must deal
2596 with two problems: the remote user always appears to be C<127.0.0.1> and
2597 the server's hostname will appear to be C<localhost> regardless of the
2598 virtual host that the user connected through.
2600 Catalyst will automatically detect this situation when you are running
2601 the frontend and backend servers on the same machine. The following
2602 changes are made to the request.
2604 $c->req->address is set to the user's real IP address, as read from
2605 the HTTP X-Forwarded-For header.
2607 The host value for $c->req->base and $c->req->uri is set to the real
2608 host, as read from the HTTP X-Forwarded-Host header.
2610 Obviously, your web server must support these headers for this to work.
2612 In a more complex server farm environment where you may have your
2613 frontend proxy server(s) on different machines, you will need to set a
2614 configuration option to tell Catalyst to read the proxied data from the
2617 MyApp->config->{using_frontend_proxy} = 1;
2619 If you do not wish to use the proxy support at all, you may set:
2621 MyApp->config->{ignore_frontend_proxy} = 1;
2623 =head1 THREAD SAFETY
2625 Catalyst has been tested under Apache 2's threading C<mpm_worker>,
2626 C<mpm_winnt>, and the standalone forking HTTP server on Windows. We
2627 believe the Catalyst core to be thread-safe.
2629 If you plan to operate in a threaded environment, remember that all other
2630 modules you are using must also be thread-safe. Some modules, most notably
2631 L<DBD::SQLite>, are not thread-safe.
2637 Join #catalyst on irc.perl.org.
2641 http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/catalyst
2642 http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/catalyst-dev
2646 http://catalyst.perl.org
2650 http://dev.catalyst.perl.org
2654 =head2 L<Task::Catalyst> - All you need to start with Catalyst
2656 =head2 L<Catalyst::Manual> - The Catalyst Manual
2658 =head2 L<Catalyst::Component>, L<Catalyst::Base> - Base classes for components
2660 =head2 L<Catalyst::Engine> - Core engine
2662 =head2 L<Catalyst::Log> - Log class.
2664 =head2 L<Catalyst::Request> - Request object
2666 =head2 L<Catalyst::Response> - Response object
2668 =head2 L<Catalyst::Test> - The test suite.
2670 =head1 PROJECT FOUNDER
2672 sri: Sebastian Riedel <sri@cpan.org>
2678 acme: Leon Brocard <leon@astray.com>
2686 andyg: Andy Grundman <andy@hybridized.org>
2688 audreyt: Audrey Tang
2690 bricas: Brian Cassidy <bricas@cpan.org>
2692 Caelum: Rafael Kitover <rkitover@io.com>
2694 chansen: Christian Hansen
2696 chicks: Christopher Hicks
2700 dkubb: Dan Kubb <dan.kubb-cpan@onautopilot.com>
2704 esskar: Sascha Kiefer
2706 fireartist: Carl Franks <cfranks@cpan.org>
2708 gabb: Danijel Milicevic
2714 ilmari: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
2716 jcamacho: Juan Camacho
2718 jhannah: Jay Hannah <jay@jays.net>
2724 jon: Jon Schutz <jjschutz@cpan.org>
2726 marcus: Marcus Ramberg <mramberg@cpan.org>
2728 miyagawa: Tatsuhiko Miyagawa <miyagawa@bulknews.net>
2730 mst: Matt S. Trout <mst@shadowcatsystems.co.uk>
2734 naughton: David Naughton
2736 ningu: David Kamholz <dkamholz@cpan.org>
2738 nothingmuch: Yuval Kogman <nothingmuch@woobling.org>
2740 numa: Dan Sully <daniel@cpan.org>
2744 omega: Andreas Marienborg
2746 Oleg Kostyuk <cub.uanic@gmail.com>
2748 phaylon: Robert Sedlacek <phaylon@dunkelheit.at>
2750 rafl: Florian Ragwitz <rafl@debian.org>
2754 the_jester: Jesse Sheidlower
2756 t0m: Tomas Doran <bobtfish@bobtfish.net>
2760 willert: Sebastian Willert <willert@cpan.org>
2764 This library is free software, you can redistribute it and/or modify it under
2765 the same terms as Perl itself.
2771 __PACKAGE__->meta->make_immutable;