4 use Moose::Meta::Class ();
5 extends 'Catalyst::Component';
6 use Moose::Util qw/find_meta/;
7 use namespace::clean -except => 'meta';
8 use Catalyst::Exception;
9 use Catalyst::Exception::Detach;
10 use Catalyst::Exception::Go;
12 use Catalyst::Request;
13 use Catalyst::Request::Upload;
14 use Catalyst::Response;
16 use Catalyst::Controller;
18 use Devel::InnerPackage ();
19 use Module::Pluggable::Object ();
20 use Text::SimpleTable ();
21 use Path::Class::Dir ();
22 use Path::Class::File ();
27 use Tree::Simple qw/use_weak_refs/;
28 use Tree::Simple::Visitor::FindByUID;
29 use Class::C3::Adopt::NEXT;
30 use List::MoreUtils qw/uniq/;
32 use String::RewritePrefix;
33 use Catalyst::EngineLoader;
35 use Carp qw/croak carp shortmess/;
38 use Plack::Middleware::Conditional;
39 use Plack::Middleware::ReverseProxy;
40 use Plack::Middleware::IIS6ScriptNameFix;
41 use Plack::Middleware::IIS7KeepAliveFix;
42 use Plack::Middleware::LighttpdScriptNameFix;
44 BEGIN { require 5.008003; }
46 has stack => (is => 'ro', default => sub { [] });
47 has stash => (is => 'rw', default => sub { {} });
48 has state => (is => 'rw', default => 0);
49 has stats => (is => 'rw');
50 has action => (is => 'rw');
51 has counter => (is => 'rw', default => sub { {} });
56 $self->request_class->new($self->_build_request_constructor_args);
60 sub _build_request_constructor_args {
62 my %p = ( _log => $self->log );
63 $p{_uploadtmp} = $self->_uploadtmp if $self->_has_uploadtmp;
71 $self->response_class->new($self->_build_response_constructor_args);
75 sub _build_response_constructor_args {
77 { _log => $self->log };
80 has namespace => (is => 'rw');
82 sub depth { scalar @{ shift->stack || [] }; }
83 sub comp { shift->component(@_) }
86 my $self = shift; return $self->request(@_);
89 my $self = shift; return $self->response(@_);
92 # For backwards compatibility
93 sub finalize_output { shift->finalize_body(@_) };
98 our $RECURSION = 1000;
99 our $DETACH = Catalyst::Exception::Detach->new;
100 our $GO = Catalyst::Exception::Go->new;
102 #I imagine that very few of these really need to be class variables. if any.
103 #maybe we should just make them attributes with a default?
104 __PACKAGE__->mk_classdata($_)
105 for qw/components arguments dispatcher engine log dispatcher_class
106 engine_loader context_class request_class response_class stats_class
107 setup_finished _psgi_app loading_psgi_file run_options/;
109 __PACKAGE__->dispatcher_class('Catalyst::Dispatcher');
110 __PACKAGE__->request_class('Catalyst::Request');
111 __PACKAGE__->response_class('Catalyst::Response');
112 __PACKAGE__->stats_class('Catalyst::Stats');
114 # Remember to update this in Catalyst::Runtime as well!
116 our $VERSION = '5.90030';
119 my ( $class, @arguments ) = @_;
121 # We have to limit $class to Catalyst to avoid pushing Catalyst upon every
123 return unless $class eq 'Catalyst';
125 my $caller = caller();
126 return if $caller eq 'main';
128 my $meta = Moose::Meta::Class->initialize($caller);
129 unless ( $caller->isa('Catalyst') ) {
130 my @superclasses = ($meta->superclasses, $class, 'Catalyst::Controller');
131 $meta->superclasses(@superclasses);
133 # Avoid possible C3 issues if 'Moose::Object' is already on RHS of MyApp
134 $meta->superclasses(grep { $_ ne 'Moose::Object' } $meta->superclasses);
136 unless( $meta->has_method('meta') ){
137 if ($Moose::VERSION >= 1.15) {
138 $meta->_add_meta_method('meta');
141 $meta->add_method(meta => sub { Moose::Meta::Class->initialize("${caller}") } );
145 $caller->arguments( [@arguments] );
149 sub _application { $_[0] }
155 Catalyst - The Elegant MVC Web Application Framework
159 See the L<Catalyst::Manual> distribution for comprehensive
160 documentation and tutorials.
162 # Install Catalyst::Devel for helpers and other development tools
163 # use the helper to create a new application
166 # add models, views, controllers
167 script/myapp_create.pl model MyDatabase DBIC::Schema create=static dbi:SQLite:/path/to/db
168 script/myapp_create.pl view MyTemplate TT
169 script/myapp_create.pl controller Search
171 # built in testserver -- use -r to restart automatically on changes
172 # --help to see all available options
173 script/myapp_server.pl
175 # command line testing interface
176 script/myapp_test.pl /yada
179 use Catalyst qw/-Debug/; # include plugins here as well
181 ### In lib/MyApp/Controller/Root.pm (autocreated)
182 sub foo : Chained('/') Args() { # called for /foo, /foo/1, /foo/1/2, etc.
183 my ( $self, $c, @args ) = @_; # args are qw/1 2/ for /foo/1/2
184 $c->stash->{template} = 'foo.tt'; # set the template
185 # lookup something from db -- stash vars are passed to TT
187 $c->model('Database::Foo')->search( { country => $args[0] } );
188 if ( $c->req->params->{bar} ) { # access GET or POST parameters
189 $c->forward( 'bar' ); # process another action
190 # do something else after forward returns
194 # The foo.tt TT template can use the stash data from the database
195 [% WHILE (item = data.next) %]
199 # called for /bar/of/soap, /bar/of/soap/10, etc.
200 sub bar : Chained('/') PathPart('/bar/of/soap') Args() { ... }
202 # called after all actions are finished
204 my ( $self, $c ) = @_;
205 if ( scalar @{ $c->error } ) { ... } # handle errors
206 return if $c->res->body; # already have a response
207 $c->forward( 'MyApp::View::TT' ); # render template
210 See L<Catalyst::Manual::Intro> for additional information.
214 Catalyst is a modern framework for making web applications without the
215 pain usually associated with this process. This document is a reference
216 to the main Catalyst application. If you are a new user, we suggest you
217 start with L<Catalyst::Manual::Tutorial> or L<Catalyst::Manual::Intro>.
219 See L<Catalyst::Manual> for more documentation.
221 Catalyst plugins can be loaded by naming them as arguments to the "use
222 Catalyst" statement. Omit the C<Catalyst::Plugin::> prefix from the
223 plugin name, i.e., C<Catalyst::Plugin::My::Module> becomes
226 use Catalyst qw/My::Module/;
228 If your plugin starts with a name other than C<Catalyst::Plugin::>, you can
229 fully qualify the name by using a unary plus:
233 +Fully::Qualified::Plugin::Name
236 Special flags like C<-Debug> can also be specified as
237 arguments when Catalyst is loaded:
239 use Catalyst qw/-Debug My::Module/;
241 The position of plugins and flags in the chain is important, because
242 they are loaded in the order in which they appear.
244 The following flags are supported:
248 Enables debug output. You can also force this setting from the system
249 environment with CATALYST_DEBUG or <MYAPP>_DEBUG. The environment
250 settings override the application, with <MYAPP>_DEBUG having the highest
253 This sets the log level to 'debug' and enables full debug output on the
254 error screen. If you only want the latter, see L<< $c->debug >>.
258 Forces Catalyst to use a specific home directory, e.g.:
260 use Catalyst qw[-Home=/usr/mst];
262 This can also be done in the shell environment by setting either the
263 C<CATALYST_HOME> environment variable or C<MYAPP_HOME>; where C<MYAPP>
264 is replaced with the uppercased name of your application, any "::" in
265 the name will be replaced with underscores, e.g. MyApp::Web should use
266 MYAPP_WEB_HOME. If both variables are set, the MYAPP_HOME one will be used.
268 If none of these are set, Catalyst will attempt to automatically detect the
269 home directory. If you are working in a development environment, Catalyst
270 will try and find the directory containing either Makefile.PL, Build.PL,
271 dist.ini, or cpanfile. If the application has been installed into the system
272 (i.e. you have done C<make install>), then Catalyst will use the path to your
273 application module, without the .pm extension (e.g., /foo/MyApp if your
274 application was installed at /foo/MyApp.pm)
278 use Catalyst '-Log=warn,fatal,error';
280 Specifies a comma-delimited list of log levels.
284 Enables statistics collection and reporting.
286 use Catalyst qw/-Stats=1/;
288 You can also force this setting from the system environment with CATALYST_STATS
289 or <MYAPP>_STATS. The environment settings override the application, with
290 <MYAPP>_STATS having the highest priority.
292 Stats are also enabled if L<< debugging |/"-Debug" >> is enabled.
296 =head2 INFORMATION ABOUT THE CURRENT REQUEST
300 Returns a L<Catalyst::Action> object for the current action, which
301 stringifies to the action name. See L<Catalyst::Action>.
305 Returns the namespace of the current action, i.e., the URI prefix
306 corresponding to the controller of the current action. For example:
308 # in Controller::Foo::Bar
309 $c->namespace; # returns 'foo/bar';
315 Returns the current L<Catalyst::Request> object, giving access to
316 information about the current client request (including parameters,
317 cookies, HTTP headers, etc.). See L<Catalyst::Request>.
319 =head2 REQUEST FLOW HANDLING
321 =head2 $c->forward( $action [, \@arguments ] )
323 =head2 $c->forward( $class, $method, [, \@arguments ] )
325 Forwards processing to another action, by its private name. If you give a
326 class name but no method, C<process()> is called. You may also optionally
327 pass arguments in an arrayref. The action will receive the arguments in
328 C<@_> and C<< $c->req->args >>. Upon returning from the function,
329 C<< $c->req->args >> will be restored to the previous values.
331 Any data C<return>ed from the action forwarded to, will be returned by the
334 my $foodata = $c->forward('/foo');
335 $c->forward('index');
336 $c->forward(qw/Model::DBIC::Foo do_stuff/);
337 $c->forward('View::TT');
339 Note that L<< forward|/"$c->forward( $action [, \@arguments ] )" >> implies
340 an C<< eval { } >> around the call (actually
341 L<< execute|/"$c->execute( $class, $coderef )" >> does), thus rendering all
342 exceptions thrown by the called action non-fatal and pushing them onto
343 $c->error instead. If you want C<die> to propagate you need to do something
347 die join "\n", @{ $c->error } if @{ $c->error };
349 Or make sure to always return true values from your actions and write
352 $c->forward('foo') || return;
354 Another note is that C<< $c->forward >> always returns a scalar because it
355 actually returns $c->state which operates in a scalar context.
356 Thus, something like:
360 in an action that is forwarded to is going to return a scalar,
361 i.e. how many items are in that array, which is probably not what you want.
362 If you need to return an array then return a reference to it,
365 $c->stash->{array} = \@array;
367 and access it from the stash.
369 Keep in mind that the C<end> method used is that of the caller action. So a C<$c-E<gt>detach> inside a forwarded action would run the C<end> method from the original action requested.
373 sub forward { my $c = shift; no warnings 'recursion'; $c->dispatcher->forward( $c, @_ ) }
375 =head2 $c->detach( $action [, \@arguments ] )
377 =head2 $c->detach( $class, $method, [, \@arguments ] )
381 The same as L<< forward|/"$c->forward( $action [, \@arguments ] )" >>, but
382 doesn't return to the previous action when processing is finished.
384 When called with no arguments it escapes the processing chain entirely.
388 sub detach { my $c = shift; $c->dispatcher->detach( $c, @_ ) }
390 =head2 $c->visit( $action [, \@arguments ] )
392 =head2 $c->visit( $action [, \@captures, \@arguments ] )
394 =head2 $c->visit( $class, $method, [, \@arguments ] )
396 =head2 $c->visit( $class, $method, [, \@captures, \@arguments ] )
398 Almost the same as L<< forward|/"$c->forward( $action [, \@arguments ] )" >>,
399 but does a full dispatch, instead of just calling the new C<$action> /
400 C<< $class->$method >>. This means that C<begin>, C<auto> and the method
401 you go to are called, just like a new request.
403 In addition both C<< $c->action >> and C<< $c->namespace >> are localized.
404 This means, for example, that C<< $c->action >> methods such as
405 L<name|Catalyst::Action/name>, L<class|Catalyst::Action/class> and
406 L<reverse|Catalyst::Action/reverse> return information for the visited action
407 when they are invoked within the visited action. This is different from the
408 behavior of L<< forward|/"$c->forward( $action [, \@arguments ] )" >>, which
409 continues to use the $c->action object from the caller action even when
410 invoked from the called action.
412 C<< $c->stash >> is kept unchanged.
414 In effect, L<< visit|/"$c->visit( $action [, \@captures, \@arguments ] )" >>
415 allows you to "wrap" another action, just as it would have been called by
416 dispatching from a URL, while the analogous
417 L<< go|/"$c->go( $action [, \@captures, \@arguments ] )" >> allows you to
418 transfer control to another action as if it had been reached directly from a URL.
422 sub visit { my $c = shift; $c->dispatcher->visit( $c, @_ ) }
424 =head2 $c->go( $action [, \@arguments ] )
426 =head2 $c->go( $action [, \@captures, \@arguments ] )
428 =head2 $c->go( $class, $method, [, \@arguments ] )
430 =head2 $c->go( $class, $method, [, \@captures, \@arguments ] )
432 The relationship between C<go> and
433 L<< visit|/"$c->visit( $action [, \@captures, \@arguments ] )" >> is the same as
434 the relationship between
435 L<< forward|/"$c->forward( $class, $method, [, \@arguments ] )" >> and
436 L<< detach|/"$c->detach( $action [, \@arguments ] )" >>. Like C<< $c->visit >>,
437 C<< $c->go >> will perform a full dispatch on the specified action or method,
438 with localized C<< $c->action >> and C<< $c->namespace >>. Like C<detach>,
439 C<go> escapes the processing of the current request chain on completion, and
440 does not return to its caller.
442 @arguments are arguments to the final destination of $action. @captures are
443 arguments to the intermediate steps, if any, on the way to the final sub of
448 sub go { my $c = shift; $c->dispatcher->go( $c, @_ ) }
454 Returns the current L<Catalyst::Response> object, see there for details.
458 Returns a hashref to the stash, which may be used to store data and pass
459 it between components during a request. You can also set hash keys by
460 passing arguments. The stash is automatically sent to the view. The
461 stash is cleared at the end of a request; it cannot be used for
462 persistent storage (for this you must use a session; see
463 L<Catalyst::Plugin::Session> for a complete system integrated with
466 $c->stash->{foo} = $bar;
467 $c->stash( { moose => 'majestic', qux => 0 } );
468 $c->stash( bar => 1, gorch => 2 ); # equivalent to passing a hashref
470 # stash is automatically passed to the view for use in a template
471 $c->forward( 'MyApp::View::TT' );
475 around stash => sub {
478 my $stash = $orig->($c);
480 my $new_stash = @_ > 1 ? {@_} : $_[0];
481 croak('stash takes a hash or hashref') unless ref $new_stash;
482 foreach my $key ( keys %$new_stash ) {
483 $stash->{$key} = $new_stash->{$key};
493 =head2 $c->error($error, ...)
495 =head2 $c->error($arrayref)
497 Returns an arrayref containing error messages. If Catalyst encounters an
498 error while processing a request, it stores the error in $c->error. This
499 method should only be used to store fatal error messages.
501 my @error = @{ $c->error };
505 $c->error('Something bad happened');
512 my $error = ref $_[0] eq 'ARRAY' ? $_[0] : [@_];
513 croak @$error unless ref $c;
514 push @{ $c->{error} }, @$error;
516 elsif ( defined $_[0] ) { $c->{error} = undef }
517 return $c->{error} || [];
523 Contains the return value of the last executed action.
524 Note that << $c->state >> operates in a scalar context which means that all
525 values it returns are scalar.
527 =head2 $c->clear_errors
529 Clear errors. You probably don't want to clear the errors unless you are
530 implementing a custom error screen.
532 This is equivalent to running
543 sub _comp_search_prefixes {
545 return map $c->components->{ $_ }, $c->_comp_names_search_prefixes(@_);
548 # search components given a name and some prefixes
549 sub _comp_names_search_prefixes {
550 my ( $c, $name, @prefixes ) = @_;
551 my $appclass = ref $c || $c;
552 my $filter = "^${appclass}::(" . join( '|', @prefixes ) . ')::';
553 $filter = qr/$filter/; # Compile regex now rather than once per loop
555 # map the original component name to the sub part that we will search against
556 my %eligible = map { my $n = $_; $n =~ s{^$appclass\::[^:]+::}{}; $_ => $n; }
557 grep { /$filter/ } keys %{ $c->components };
559 # undef for a name will return all
560 return keys %eligible if !defined $name;
562 my $query = $name->$_isa('Regexp') ? $name : qr/^$name$/i;
563 my @result = grep { $eligible{$_} =~ m{$query} } keys %eligible;
565 return @result if @result;
567 # if we were given a regexp to search against, we're done.
568 return if $name->$_isa('Regexp');
570 # skip regexp fallback if configured
572 if $appclass->config->{disable_component_resolution_regex_fallback};
576 @result = grep { $eligible{ $_ } =~ m{$query} } keys %eligible;
578 # no results? try against full names
580 @result = grep { m{$query} } keys %eligible;
583 # don't warn if we didn't find any results, it just might not exist
585 # Disgusting hack to work out correct method name
586 my $warn_for = lc $prefixes[0];
587 my $msg = "Used regexp fallback for \$c->${warn_for}('${name}'), which found '" .
588 (join '", "', @result) . "'. Relying on regexp fallback behavior for " .
589 "component resolution is unreliable and unsafe.";
590 my $short = $result[0];
591 # remove the component namespace prefix
592 $short =~ s/.*?(Model|Controller|View):://;
593 my $shortmess = Carp::shortmess('');
594 if ($shortmess =~ m#Catalyst/Plugin#) {
595 $msg .= " You probably need to set '$short' instead of '${name}' in this " .
597 } elsif ($shortmess =~ m#Catalyst/lib/(View|Controller)#) {
598 $msg .= " You probably need to set '$short' instead of '${name}' in this " .
599 "component's config";
601 $msg .= " You probably meant \$c->${warn_for}('$short') instead of \$c->${warn_for}('${name}'), " .
602 "but if you really wanted to search, pass in a regexp as the argument " .
603 "like so: \$c->${warn_for}(qr/${name}/)";
605 $c->log->warn( "${msg}$shortmess" );
611 # Find possible names for a prefix
613 my ( $c, @prefixes ) = @_;
614 my $appclass = ref $c || $c;
616 my $filter = "^${appclass}::(" . join( '|', @prefixes ) . ')::';
618 my @names = map { s{$filter}{}; $_; }
619 $c->_comp_names_search_prefixes( undef, @prefixes );
624 # Filter a component before returning by calling ACCEPT_CONTEXT if available
625 sub _filter_component {
626 my ( $c, $comp, @args ) = @_;
628 if ( eval { $comp->can('ACCEPT_CONTEXT'); } ) {
629 return $comp->ACCEPT_CONTEXT( $c, @args );
635 =head2 COMPONENT ACCESSORS
637 =head2 $c->controller($name)
639 Gets a L<Catalyst::Controller> instance by name.
641 $c->controller('Foo')->do_stuff;
643 If the name is omitted, will return the controller for the dispatched
646 If you want to search for controllers, pass in a regexp as the argument.
648 # find all controllers that start with Foo
649 my @foo_controllers = $c->controller(qr{^Foo});
655 my ( $c, $name, @args ) = @_;
657 my $appclass = ref($c) || $c;
659 unless ( $name->$_isa('Regexp') ) { # Direct component hash lookup to avoid costly regexps
660 my $comps = $c->components;
661 my $check = $appclass."::Controller::".$name;
662 return $c->_filter_component( $comps->{$check}, @args ) if exists $comps->{$check};
664 my @result = $c->_comp_search_prefixes( $name, qw/Controller C/ );
665 return map { $c->_filter_component( $_, @args ) } @result if ref $name;
666 return $c->_filter_component( $result[ 0 ], @args );
669 return $c->component( $c->action->class );
672 =head2 $c->model($name)
674 Gets a L<Catalyst::Model> instance by name.
676 $c->model('Foo')->do_stuff;
678 Any extra arguments are directly passed to ACCEPT_CONTEXT.
680 If the name is omitted, it will look for
681 - a model object in $c->stash->{current_model_instance}, then
682 - a model name in $c->stash->{current_model}, then
683 - a config setting 'default_model', or
684 - check if there is only one model, and return it if that's the case.
686 If you want to search for models, pass in a regexp as the argument.
688 # find all models that start with Foo
689 my @foo_models = $c->model(qr{^Foo});
694 my ( $c, $name, @args ) = @_;
695 my $appclass = ref($c) || $c;
697 unless ( $name->$_isa('Regexp') ) { # Direct component hash lookup to avoid costly regexps
698 my $comps = $c->components;
699 my $check = $appclass."::Model::".$name;
700 return $c->_filter_component( $comps->{$check}, @args ) if exists $comps->{$check};
702 my @result = $c->_comp_search_prefixes( $name, qw/Model M/ );
703 return map { $c->_filter_component( $_, @args ) } @result if ref $name;
704 return $c->_filter_component( $result[ 0 ], @args );
708 return $c->stash->{current_model_instance}
709 if $c->stash->{current_model_instance};
710 return $c->model( $c->stash->{current_model} )
711 if $c->stash->{current_model};
713 return $c->model( $appclass->config->{default_model} )
714 if $appclass->config->{default_model};
716 my( $comp, $rest ) = $c->_comp_search_prefixes( undef, qw/Model M/);
719 $c->log->warn( Carp::shortmess('Calling $c->model() will return a random model unless you specify one of:') );
720 $c->log->warn( '* $c->config(default_model => "the name of the default model to use")' );
721 $c->log->warn( '* $c->stash->{current_model} # the name of the model to use for this request' );
722 $c->log->warn( '* $c->stash->{current_model_instance} # the instance of the model to use for this request' );
723 $c->log->warn( 'NB: in version 5.81, the "random" behavior will not work at all.' );
726 return $c->_filter_component( $comp );
730 =head2 $c->view($name)
732 Gets a L<Catalyst::View> instance by name.
734 $c->view('Foo')->do_stuff;
736 Any extra arguments are directly passed to ACCEPT_CONTEXT.
738 If the name is omitted, it will look for
739 - a view object in $c->stash->{current_view_instance}, then
740 - a view name in $c->stash->{current_view}, then
741 - a config setting 'default_view', or
742 - check if there is only one view, and return it if that's the case.
744 If you want to search for views, pass in a regexp as the argument.
746 # find all views that start with Foo
747 my @foo_views = $c->view(qr{^Foo});
752 my ( $c, $name, @args ) = @_;
754 my $appclass = ref($c) || $c;
756 unless ( $name->$_isa('Regexp') ) { # Direct component hash lookup to avoid costly regexps
757 my $comps = $c->components;
758 my $check = $appclass."::View::".$name;
759 if( exists $comps->{$check} ) {
760 return $c->_filter_component( $comps->{$check}, @args );
763 $c->log->warn( "Attempted to use view '$check', but does not exist" );
766 my @result = $c->_comp_search_prefixes( $name, qw/View V/ );
767 return map { $c->_filter_component( $_, @args ) } @result if ref $name;
768 return $c->_filter_component( $result[ 0 ], @args );
772 return $c->stash->{current_view_instance}
773 if $c->stash->{current_view_instance};
774 return $c->view( $c->stash->{current_view} )
775 if $c->stash->{current_view};
777 return $c->view( $appclass->config->{default_view} )
778 if $appclass->config->{default_view};
780 my( $comp, $rest ) = $c->_comp_search_prefixes( undef, qw/View V/);
783 $c->log->warn( 'Calling $c->view() will return a random view unless you specify one of:' );
784 $c->log->warn( '* $c->config(default_view => "the name of the default view to use")' );
785 $c->log->warn( '* $c->stash->{current_view} # the name of the view to use for this request' );
786 $c->log->warn( '* $c->stash->{current_view_instance} # the instance of the view to use for this request' );
787 $c->log->warn( 'NB: in version 5.81, the "random" behavior will not work at all.' );
790 return $c->_filter_component( $comp );
793 =head2 $c->controllers
795 Returns the available names which can be passed to $c->controller
801 return $c->_comp_names(qw/Controller C/);
806 Returns the available names which can be passed to $c->model
812 return $c->_comp_names(qw/Model M/);
818 Returns the available names which can be passed to $c->view
824 return $c->_comp_names(qw/View V/);
827 =head2 $c->comp($name)
829 =head2 $c->component($name)
831 Gets a component object by name. This method is not recommended,
832 unless you want to get a specific component by full
833 class. C<< $c->controller >>, C<< $c->model >>, and C<< $c->view >>
834 should be used instead.
836 If C<$name> is a regexp, a list of components matched against the full
837 component name will be returned.
839 If Catalyst can't find a component by name, it will fallback to regex
840 matching by default. To disable this behaviour set
841 disable_component_resolution_regex_fallback to a true value.
843 __PACKAGE__->config( disable_component_resolution_regex_fallback => 1 );
848 my ( $c, $name, @args ) = @_;
851 my $comps = $c->components;
854 # is it the exact name?
855 return $c->_filter_component( $comps->{ $name }, @args )
856 if exists $comps->{ $name };
858 # perhaps we just omitted "MyApp"?
859 my $composed = ( ref $c || $c ) . "::${name}";
860 return $c->_filter_component( $comps->{ $composed }, @args )
861 if exists $comps->{ $composed };
863 # search all of the models, views and controllers
864 my( $comp ) = $c->_comp_search_prefixes( $name, qw/Model M Controller C View V/ );
865 return $c->_filter_component( $comp, @args ) if $comp;
869 if $c->config->{disable_component_resolution_regex_fallback};
871 # This is here so $c->comp( '::M::' ) works
872 my $query = ref $name ? $name : qr{$name}i;
874 my @result = grep { m{$query} } keys %{ $c->components };
875 return map { $c->_filter_component( $_, @args ) } @result if ref $name;
878 $c->log->warn( Carp::shortmess(qq(Found results for "${name}" using regexp fallback)) );
879 $c->log->warn( 'Relying on the regexp fallback behavior for component resolution' );
880 $c->log->warn( 'is unreliable and unsafe. You have been warned' );
881 return $c->_filter_component( $result[ 0 ], @args );
884 # I would expect to return an empty list here, but that breaks back-compat
888 return sort keys %{ $c->components };
891 =head2 CLASS DATA AND HELPER CLASSES
895 Returns or takes a hashref containing the application's configuration.
897 __PACKAGE__->config( { db => 'dsn:SQLite:foo.db' } );
899 You can also use a C<YAML>, C<XML> or L<Config::General> config file
900 like C<myapp.conf> in your applications home directory. See
901 L<Catalyst::Plugin::ConfigLoader>.
903 =head3 Cascading configuration
905 The config method is present on all Catalyst components, and configuration
906 will be merged when an application is started. Configuration loaded with
907 L<Catalyst::Plugin::ConfigLoader> takes precedence over other configuration,
908 followed by configuration in your top level C<MyApp> class. These two
909 configurations are merged, and then configuration data whose hash key matches a
910 component name is merged with configuration for that component.
912 The configuration for a component is then passed to the C<new> method when a
913 component is constructed.
917 MyApp->config({ 'Model::Foo' => { bar => 'baz', overrides => 'me' } });
918 MyApp::Model::Foo->config({ quux => 'frob', overrides => 'this' });
920 will mean that C<MyApp::Model::Foo> receives the following data when
923 MyApp::Model::Foo->new({
929 It's common practice to use a Moose attribute
930 on the receiving component to access the config value.
932 package MyApp::Model::Foo;
936 # this attr will receive 'baz' at construction time
942 You can then get the value 'baz' by calling $c->model('Foo')->bar
943 (or $self->bar inside code in the model).
945 B<NOTE:> you MUST NOT call C<< $self->config >> or C<< __PACKAGE__->config >>
946 as a way of reading config within your code, as this B<will not> give you the
947 correctly merged config back. You B<MUST> take the config values supplied to
948 the constructor and use those instead.
952 around config => sub {
956 croak('Setting config after setup has been run is not allowed.')
957 if ( @_ and $c->setup_finished );
964 Returns the logging object instance. Unless it is already set, Catalyst
965 sets this up with a L<Catalyst::Log> object. To use your own log class,
966 set the logger with the C<< __PACKAGE__->log >> method prior to calling
967 C<< __PACKAGE__->setup >>.
969 __PACKAGE__->log( MyLogger->new );
974 $c->log->info( 'Now logging with my own logger!' );
976 Your log class should implement the methods described in
982 Returns 1 if debug mode is enabled, 0 otherwise.
984 You can enable debug mode in several ways:
988 =item By calling myapp_server.pl with the -d flag
990 =item With the environment variables MYAPP_DEBUG, or CATALYST_DEBUG
992 =item The -Debug option in your MyApp.pm
994 =item By declaring C<sub debug { 1 }> in your MyApp.pm.
998 The first three also set the log level to 'debug'.
1000 Calling C<< $c->debug(1) >> has no effect.
1006 =head2 $c->dispatcher
1008 Returns the dispatcher instance. See L<Catalyst::Dispatcher>.
1012 Returns the engine instance. See L<Catalyst::Engine>.
1015 =head2 UTILITY METHODS
1017 =head2 $c->path_to(@path)
1019 Merges C<@path> with C<< $c->config->{home} >> and returns a
1020 L<Path::Class::Dir> object. Note you can usually use this object as
1021 a filename, but sometimes you will have to explicitly stringify it
1022 yourself by calling the C<< ->stringify >> method.
1026 $c->path_to( 'db', 'sqlite.db' );
1031 my ( $c, @path ) = @_;
1032 my $path = Path::Class::Dir->new( $c->config->{home}, @path );
1033 if ( -d $path ) { return $path }
1034 else { return Path::Class::File->new( $c->config->{home}, @path ) }
1038 my ( $class, $name, $plugin, @args ) = @_;
1040 # See block comment in t/unit_core_plugin.t
1041 $class->log->warn(qq/Adding plugin using the ->plugin method is deprecated, and will be removed in a future release/);
1043 $class->_register_plugin( $plugin, 1 );
1045 eval { $plugin->import };
1046 $class->mk_classdata($name);
1048 eval { $obj = $plugin->new(@args) };
1051 Catalyst::Exception->throw( message =>
1052 qq/Couldn't instantiate instant plugin "$plugin", "$@"/ );
1055 $class->$name($obj);
1056 $class->log->debug(qq/Initialized instant plugin "$plugin" as "$name"/)
1062 Initializes the dispatcher and engine, loads any plugins, and loads the
1063 model, view, and controller components. You may also specify an array
1064 of plugins to load here, if you choose to not load them in the C<use
1068 MyApp->setup( qw/-Debug/ );
1070 B<Note:> You B<should not> wrap this method with method modifiers
1071 or bad things will happen - wrap the C<setup_finalize> method instead.
1076 my ( $class, @arguments ) = @_;
1077 croak('Running setup more than once')
1078 if ( $class->setup_finished );
1080 unless ( $class->isa('Catalyst') ) {
1082 Catalyst::Exception->throw(
1083 message => qq/'$class' does not inherit from Catalyst/ );
1086 if ( $class->arguments ) {
1087 @arguments = ( @arguments, @{ $class->arguments } );
1093 foreach (@arguments) {
1097 ( $flags->{log} ) ? 'debug,' . $flags->{log} : 'debug';
1099 elsif (/^-(\w+)=?(.*)$/) {
1100 $flags->{ lc $1 } = $2;
1103 push @{ $flags->{plugins} }, $_;
1107 $class->setup_home( delete $flags->{home} );
1109 $class->setup_log( delete $flags->{log} );
1110 $class->setup_plugins( delete $flags->{plugins} );
1111 $class->setup_dispatcher( delete $flags->{dispatcher} );
1112 if (my $engine = delete $flags->{engine}) {
1113 $class->log->warn("Specifying the engine in ->setup is no longer supported, see Catalyst::Upgrading");
1115 $class->setup_engine();
1116 $class->setup_stats( delete $flags->{stats} );
1118 for my $flag ( sort keys %{$flags} ) {
1120 if ( my $code = $class->can( 'setup_' . $flag ) ) {
1121 &$code( $class, delete $flags->{$flag} );
1124 $class->log->warn(qq/Unknown flag "$flag"/);
1128 eval { require Catalyst::Devel; };
1129 if( !$@ && $ENV{CATALYST_SCRIPT_GEN} && ( $ENV{CATALYST_SCRIPT_GEN} < $Catalyst::Devel::CATALYST_SCRIPT_GEN ) ) {
1130 $class->log->warn(<<"EOF");
1131 You are running an old script!
1133 Please update by running (this will overwrite existing files):
1134 catalyst.pl -force -scripts $class
1136 or (this will not overwrite existing files):
1137 catalyst.pl -scripts $class
1142 if ( $class->debug ) {
1143 my @plugins = map { "$_ " . ( $_->VERSION || '' ) } $class->registered_plugins;
1146 my $column_width = Catalyst::Utils::term_width() - 6;
1147 my $t = Text::SimpleTable->new($column_width);
1148 $t->row($_) for @plugins;
1149 $class->log->debug( "Loaded plugins:\n" . $t->draw . "\n" );
1152 my $dispatcher = $class->dispatcher;
1153 my $engine = $class->engine;
1154 my $home = $class->config->{home};
1156 $class->log->debug(sprintf(q/Loaded dispatcher "%s"/, blessed($dispatcher)));
1157 $class->log->debug(sprintf(q/Loaded engine "%s"/, blessed($engine)));
1161 ? $class->log->debug(qq/Found home "$home"/)
1162 : $class->log->debug(qq/Home "$home" doesn't exist/)
1163 : $class->log->debug(q/Couldn't find home/);
1166 # Call plugins setup, this is stupid and evil.
1167 # Also screws C3 badly on 5.10, hack to avoid.
1169 no warnings qw/redefine/;
1170 local *setup = sub { };
1171 $class->setup unless $Catalyst::__AM_RESTARTING;
1174 # Initialize our data structure
1175 $class->components( {} );
1177 $class->setup_components;
1179 if ( $class->debug ) {
1180 my $column_width = Catalyst::Utils::term_width() - 8 - 9;
1181 my $t = Text::SimpleTable->new( [ $column_width, 'Class' ], [ 8, 'Type' ] );
1182 for my $comp ( sort keys %{ $class->components } ) {
1183 my $type = ref $class->components->{$comp} ? 'instance' : 'class';
1184 $t->row( $comp, $type );
1186 $class->log->debug( "Loaded components:\n" . $t->draw . "\n" )
1187 if ( keys %{ $class->components } );
1190 # Add our self to components, since we are also a component
1191 if( $class->isa('Catalyst::Controller') ){
1192 $class->components->{$class} = $class;
1195 $class->setup_actions;
1197 if ( $class->debug ) {
1198 my $name = $class->config->{name} || 'Application';
1199 $class->log->info("$name powered by Catalyst $Catalyst::VERSION");
1202 if ($class->config->{case_sensitive}) {
1203 $class->log->warn($class . "->config->{case_sensitive} is set.");
1204 $class->log->warn("This setting is deprecated and planned to be removed in Catalyst 5.81.");
1207 $class->setup_finalize;
1208 # Should be the last thing we do so that user things hooking
1209 # setup_finalize can log..
1210 $class->log->_flush() if $class->log->can('_flush');
1211 return 1; # Explicit return true as people have __PACKAGE__->setup as the last thing in their class. HATE.
1214 =head2 $app->setup_finalize
1216 A hook to attach modifiers to. This method does not do anything except set the
1217 C<setup_finished> accessor.
1219 Applying method modifiers to the C<setup> method doesn't work, because of quirky things done for plugin setup.
1223 after setup_finalize => sub {
1231 sub setup_finalize {
1233 $class->setup_finished(1);
1236 =head2 $c->uri_for( $path?, @args?, \%query_values? )
1238 =head2 $c->uri_for( $action, \@captures?, @args?, \%query_values? )
1240 Constructs an absolute L<URI> object based on the application root, the
1241 provided path, and the additional arguments and query parameters provided.
1242 When used as a string, provides a textual URI. If you need more flexibility
1243 than this (i.e. the option to provide relative URIs etc.) see
1244 L<Catalyst::Plugin::SmartURI>.
1246 If no arguments are provided, the URI for the current action is returned.
1247 To return the current action and also provide @args, use
1248 C<< $c->uri_for( $c->action, @args ) >>.
1250 If the first argument is a string, it is taken as a public URI path relative
1251 to C<< $c->namespace >> (if it doesn't begin with a forward slash) or
1252 relative to the application root (if it does). It is then merged with
1253 C<< $c->request->base >>; any C<@args> are appended as additional path
1254 components; and any C<%query_values> are appended as C<?foo=bar> parameters.
1256 If the first argument is a L<Catalyst::Action> it represents an action which
1257 will have its path resolved using C<< $c->dispatcher->uri_for_action >>. The
1258 optional C<\@captures> argument (an arrayref) allows passing the captured
1259 variables that are needed to fill in the paths of Chained and Regex actions;
1260 once the path is resolved, C<uri_for> continues as though a path was
1261 provided, appending any arguments or parameters and creating an absolute
1264 The captures for the current request can be found in
1265 C<< $c->request->captures >>, and actions can be resolved using
1266 C<< Catalyst::Controller->action_for($name) >>. If you have a private action
1267 path, use C<< $c->uri_for_action >> instead.
1269 # Equivalent to $c->req->uri
1270 $c->uri_for($c->action, $c->req->captures,
1271 @{ $c->req->args }, $c->req->params);
1273 # For the Foo action in the Bar controller
1274 $c->uri_for($c->controller('Bar')->action_for('Foo'));
1276 # Path to a static resource
1277 $c->uri_for('/static/images/logo.png');
1282 my ( $c, $path, @args ) = @_;
1284 if ( $path->$_isa('Catalyst::Controller') ) {
1285 $path = $path->path_prefix;
1290 undef($path) if (defined $path && $path eq '');
1293 ( scalar @args && ref $args[$#args] eq 'HASH' ? pop @args : {} );
1295 carp "uri_for called with undef argument" if grep { ! defined $_ } @args;
1296 foreach my $arg (@args) {
1297 utf8::encode($arg) if utf8::is_utf8($arg);
1298 $arg =~ s/([^$URI::uric])/$URI::Escape::escapes{$1}/go;
1301 if ( $path->$_isa('Catalyst::Action') ) { # action object
1302 s|/|%2F|g for @args;
1303 my $captures = [ map { s|/|%2F|g; $_; }
1304 ( scalar @args && ref $args[0] eq 'ARRAY'
1308 foreach my $capture (@$captures) {
1309 utf8::encode($capture) if utf8::is_utf8($capture);
1310 $capture =~ s/([^$URI::uric])/$URI::Escape::escapes{$1}/go;
1314 # ->uri_for( $action, \@captures_and_args, \%query_values? )
1315 if( !@args && $action->number_of_args ) {
1316 my $expanded_action = $c->dispatcher->expand_action( $action );
1318 my $num_captures = $expanded_action->number_of_captures;
1319 unshift @args, splice @$captures, $num_captures;
1322 $path = $c->dispatcher->uri_for_action($action, $captures);
1323 if (not defined $path) {
1324 $c->log->debug(qq/Can't find uri_for action '$action' @$captures/)
1328 $path = '/' if $path eq '';
1331 unshift(@args, $path);
1333 unless (defined $path && $path =~ s!^/!!) { # in-place strip
1334 my $namespace = $c->namespace;
1335 if (defined $path) { # cheesy hack to handle path '../foo'
1336 $namespace =~ s{(?:^|/)[^/]+$}{} while $args[0] =~ s{^\.\./}{};
1338 unshift(@args, $namespace || '');
1341 # join args with '/', or a blank string
1342 my $args = join('/', grep { defined($_) } @args);
1343 $args =~ s/\?/%3F/g; # STUPID STUPID SPECIAL CASE
1346 my ($base, $class) = ('/', 'URI::_generic');
1348 $base = $c->req->base;
1349 $class = ref($base);
1350 $base =~ s{(?<!/)$}{/};
1355 if (my @keys = keys %$params) {
1356 # somewhat lifted from URI::_query's query_form
1357 $query = '?'.join('&', map {
1358 my $val = $params->{$_};
1359 s/([;\/?:@&=+,\$\[\]%])/$URI::Escape::escapes{$1}/go;
1362 $val = '' unless defined $val;
1365 utf8::encode( $param ) if utf8::is_utf8($param);
1366 # using the URI::Escape pattern here so utf8 chars survive
1367 $param =~ s/([^A-Za-z0-9\-_.!~*'() ])/$URI::Escape::escapes{$1}/go;
1369 "${key}=$param"; } ( ref $val eq 'ARRAY' ? @$val : $val ));
1373 my $res = bless(\"${base}${args}${query}", $class);
1377 =head2 $c->uri_for_action( $path, \@captures_and_args?, @args?, \%query_values? )
1379 =head2 $c->uri_for_action( $action, \@captures_and_args?, @args?, \%query_values? )
1385 A private path to the Catalyst action you want to create a URI for.
1387 This is a shortcut for calling C<< $c->dispatcher->get_action_by_path($path)
1388 >> and passing the resulting C<$action> and the remaining arguments to C<<
1391 You can also pass in a Catalyst::Action object, in which case it is passed to
1394 Note that although the path looks like a URI that dispatches to the wanted action, it is not a URI, but an internal path to that action.
1396 For example, if the action looks like:
1398 package MyApp::Controller::Users;
1400 sub lst : Path('the-list') {}
1404 $c->uri_for_action('/users/lst')
1406 and it will create the URI /users/the-list.
1408 =item \@captures_and_args?
1410 Optional array reference of Captures (i.e. C<<CaptureArgs or $c->req->captures>)
1411 and arguments to the request. Usually used with L<Catalyst::DispatchType::Chained>
1412 to interpolate all the parameters in the URI.
1416 Optional list of extra arguments - can be supplied in the
1417 C<< \@captures_and_args? >> array ref, or here - whichever is easier for your
1420 Your action can have zero, a fixed or a variable number of args (e.g.
1421 C<< Args(1) >> for a fixed number or C<< Args() >> for a variable number)..
1423 =item \%query_values?
1425 Optional array reference of query parameters to append. E.g.
1431 /rest/of/your/uri?foo=bar
1437 sub uri_for_action {
1438 my ( $c, $path, @args ) = @_;
1439 my $action = blessed($path)
1441 : $c->dispatcher->get_action_by_path($path);
1442 unless (defined $action) {
1443 croak "Can't find action for path '$path'";
1445 return $c->uri_for( $action, @args );
1448 =head2 $c->welcome_message
1450 Returns the Catalyst welcome HTML page.
1454 sub welcome_message {
1456 my $name = $c->config->{name};
1457 my $logo = $c->uri_for('/static/images/catalyst_logo.png');
1458 my $prefix = Catalyst::Utils::appprefix( ref $c );
1459 $c->response->content_type('text/html; charset=utf-8');
1461 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
1462 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
1463 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
1465 <meta http-equiv="Content-Language" content="en" />
1466 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
1467 <title>$name on Catalyst $VERSION</title>
1468 <style type="text/css">
1471 background-color: #eee;
1478 margin-bottom: 10px;
1480 background-color: #ccc;
1481 border: 1px solid #aaa;
1486 font-family: verdana, tahoma, sans-serif;
1489 font-family: verdana, tahoma, sans-serif;
1492 text-decoration: none;
1494 border-bottom: 1px dotted #bbb;
1496 :link:hover, :visited:hover {
1509 background-color: #fff;
1510 border: 1px solid #aaa;
1514 font-weight: normal;
1536 <h1><span id="appname">$name</span> on <a href="http://catalyst.perl.org">Catalyst</a>
1541 <img src="$logo" alt="Catalyst Logo" />
1543 <p>Welcome to the world of Catalyst.
1544 This <a href="http://en.wikipedia.org/wiki/MVC">MVC</a>
1545 framework will make web development something you had
1546 never expected it to be: Fun, rewarding, and quick.</p>
1547 <h2>What to do now?</h2>
1548 <p>That really depends on what <b>you</b> want to do.
1549 We do, however, provide you with a few starting points.</p>
1550 <p>If you want to jump right into web development with Catalyst
1551 you might want to start with a tutorial.</p>
1552 <pre>perldoc <a href="https://metacpan.org/module/Catalyst::Manual::Tutorial">Catalyst::Manual::Tutorial</a></code>
1554 <p>Afterwards you can go on to check out a more complete look at our features.</p>
1556 <code>perldoc <a href="https://metacpan.org/module/Catalyst::Manual::Intro">Catalyst::Manual::Intro</a>
1557 <!-- Something else should go here, but the Catalyst::Manual link seems unhelpful -->
1559 <h2>What to do next?</h2>
1560 <p>Next it's time to write an actual application. Use the
1561 helper scripts to generate <a href="https://metacpan.org/search?q=Catalyst%3A%3AController">controllers</a>,
1562 <a href="https://metacpan.org/search?q=Catalyst%3A%3AModel">models</a>, and
1563 <a href="https://metacpan.org/search?q=Catalyst%3A%3AView">views</a>;
1564 they can save you a lot of work.</p>
1565 <pre><code>script/${prefix}_create.pl --help</code></pre>
1566 <p>Also, be sure to check out the vast and growing
1567 collection of <a href="http://search.cpan.org/search?query=Catalyst">plugins for Catalyst on CPAN</a>;
1568 you are likely to find what you need there.
1572 <p>Catalyst has a very active community. Here are the main places to
1573 get in touch with us.</p>
1576 <a href="http://dev.catalyst.perl.org">Wiki</a>
1579 <a href="http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/catalyst">Mailing-List</a>
1582 <a href="irc://irc.perl.org/catalyst">IRC channel #catalyst on irc.perl.org</a>
1585 <h2>In conclusion</h2>
1586 <p>The Catalyst team hopes you will enjoy using Catalyst as much
1587 as we enjoyed making it. Please contact us if you have ideas
1588 for improvement or other feedback.</p>
1598 Contains a hash of options passed from the application script, including
1599 the original ARGV the script received, the processed values from that
1600 ARGV and any extra arguments to the script which were not processed.
1602 This can be used to add custom options to your application's scripts
1603 and setup your application differently depending on the values of these
1606 =head1 INTERNAL METHODS
1608 These methods are not meant to be used by end users.
1610 =head2 $c->components
1612 Returns a hash of components.
1614 =head2 $c->context_class
1616 Returns or sets the context class.
1620 Returns a hashref containing coderefs and execution counts (needed for
1621 deep recursion detection).
1625 Returns the number of actions on the current internal execution stack.
1629 Dispatches a request to actions.
1633 sub dispatch { my $c = shift; $c->dispatcher->dispatch( $c, @_ ) }
1635 =head2 $c->dispatcher_class
1637 Returns or sets the dispatcher class.
1639 =head2 $c->dump_these
1641 Returns a list of 2-element array references (name, structure) pairs
1642 that will be dumped on the error page in debug mode.
1648 [ Request => $c->req ],
1649 [ Response => $c->res ],
1650 [ Stash => $c->stash ],
1651 [ Config => $c->config ];
1654 =head2 $c->engine_class
1656 Returns or sets the engine class.
1658 =head2 $c->execute( $class, $coderef )
1660 Execute a coderef in given class and catch exceptions. Errors are available
1666 my ( $c, $class, $code ) = @_;
1667 $class = $c->component($class) || $class;
1670 if ( $c->depth >= $RECURSION ) {
1671 my $action = $code->reverse();
1672 $action = "/$action" unless $action =~ /->/;
1673 my $error = qq/Deep recursion detected calling "${action}"/;
1674 $c->log->error($error);
1680 my $stats_info = $c->_stats_start_execute( $code ) if $c->use_stats;
1682 push( @{ $c->stack }, $code );
1684 no warnings 'recursion';
1685 # N.B. This used to be combined, but I have seen $c get clobbered if so, and
1686 # I have no idea how, ergo $ret (which appears to fix the issue)
1687 eval { my $ret = $code->execute( $class, $c, @{ $c->req->args } ) || 0; $c->state( $ret ) };
1689 $c->_stats_finish_execute( $stats_info ) if $c->use_stats and $stats_info;
1691 my $last = pop( @{ $c->stack } );
1693 if ( my $error = $@ ) {
1694 if ( blessed($error) and $error->isa('Catalyst::Exception::Detach') ) {
1695 $error->rethrow if $c->depth > 1;
1697 elsif ( blessed($error) and $error->isa('Catalyst::Exception::Go') ) {
1698 $error->rethrow if $c->depth > 0;
1701 unless ( ref $error ) {
1702 no warnings 'uninitialized';
1704 my $class = $last->class;
1705 my $name = $last->name;
1706 $error = qq/Caught exception in $class->$name "$error"/;
1715 sub _stats_start_execute {
1716 my ( $c, $code ) = @_;
1717 my $appclass = ref($c) || $c;
1718 return if ( ( $code->name =~ /^_.*/ )
1719 && ( !$appclass->config->{show_internal_actions} ) );
1721 my $action_name = $code->reverse();
1722 $c->counter->{$action_name}++;
1724 my $action = $action_name;
1725 $action = "/$action" unless $action =~ /->/;
1727 # determine if the call was the result of a forward
1728 # this is done by walking up the call stack and looking for a calling
1729 # sub of Catalyst::forward before the eval
1731 for my $index ( 2 .. 11 ) {
1733 if ( ( caller($index) )[0] eq 'Catalyst'
1734 && ( caller($index) )[3] eq '(eval)' );
1736 if ( ( caller($index) )[3] =~ /forward$/ ) {
1737 $callsub = ( caller($index) )[3];
1738 $action = "-> $action";
1743 my $uid = $action_name . $c->counter->{$action_name};
1745 # is this a root-level call or a forwarded call?
1746 if ( $callsub =~ /forward$/ ) {
1747 my $parent = $c->stack->[-1];
1749 # forward, locate the caller
1750 if ( defined $parent && exists $c->counter->{"$parent"} ) {
1753 parent => "$parent" . $c->counter->{"$parent"},
1759 # forward with no caller may come from a plugin
1778 sub _stats_finish_execute {
1779 my ( $c, $info ) = @_;
1780 $c->stats->profile( end => $info );
1785 Finalizes the request.
1792 for my $error ( @{ $c->error } ) {
1793 $c->log->error($error);
1796 # Support skipping finalize for psgix.io style 'jailbreak'. Used to support
1797 # stuff like cometd and websockets
1799 return if $c->request->has_io_fh;
1801 # Allow engine to handle finalize flow (for POE)
1802 my $engine = $c->engine;
1803 if ( my $code = $engine->can('finalize') ) {
1808 $c->finalize_uploads;
1811 if ( $#{ $c->error } >= 0 ) {
1815 $c->finalize_headers unless $c->response->finalized_headers;
1818 if ( $c->request->method eq 'HEAD' ) {
1819 $c->response->body('');
1827 if ($c->use_stats) {
1828 my $elapsed = sprintf '%f', $c->stats->elapsed;
1829 my $av = $elapsed == 0 ? '??' : sprintf '%.3f', 1 / $elapsed;
1831 "Request took ${elapsed}s ($av/s)\n" . $c->stats->report . "\n" );
1834 return $c->response->status;
1837 =head2 $c->finalize_body
1843 sub finalize_body { my $c = shift; $c->engine->finalize_body( $c, @_ ) }
1845 =head2 $c->finalize_cookies
1851 sub finalize_cookies { my $c = shift; $c->engine->finalize_cookies( $c, @_ ) }
1853 =head2 $c->finalize_error
1859 sub finalize_error { my $c = shift; $c->engine->finalize_error( $c, @_ ) }
1861 =head2 $c->finalize_headers
1867 sub finalize_headers {
1870 my $response = $c->response; #accessor calls can add up?
1872 # Check if we already finalized headers
1873 return if $response->finalized_headers;
1876 if ( my $location = $response->redirect ) {
1877 $c->log->debug(qq/Redirecting to "$location"/) if $c->debug;
1878 $response->header( Location => $location );
1880 if ( !$response->has_body ) {
1881 # Add a default body if none is already present
1882 my $encoded_location = encode_entities($location);
1883 $response->body(<<"EOF");
1884 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
1885 <html xmlns="http://www.w3.org/1999/xhtml">
1887 <title>Moved</title>
1890 <p>This item has moved <a href="$encoded_location">here</a>.</p>
1894 $response->content_type('text/html; charset=utf-8');
1899 if ( defined $response->body && length $response->body && !$response->content_length ) {
1901 # get the length from a filehandle
1902 if ( blessed( $response->body ) && $response->body->can('read') || ref( $response->body ) eq 'GLOB' )
1904 my $size = -s $response->body;
1906 $response->content_length( $size );
1909 $c->log->warn('Serving filehandle without a content-length');
1913 # everything should be bytes at this point, but just in case
1914 $response->content_length( length( $response->body ) );
1919 if ( $response->status =~ /^(1\d\d|[23]04)$/ ) {
1920 $response->headers->remove_header("Content-Length");
1921 $response->body('');
1924 $c->finalize_cookies;
1926 $c->response->finalize_headers();
1929 $response->finalized_headers(1);
1932 =head2 $c->finalize_output
1934 An alias for finalize_body.
1936 =head2 $c->finalize_read
1938 Finalizes the input after reading is complete.
1942 sub finalize_read { my $c = shift; $c->engine->finalize_read( $c, @_ ) }
1944 =head2 $c->finalize_uploads
1946 Finalizes uploads. Cleans up any temporary files.
1950 sub finalize_uploads { my $c = shift; $c->engine->finalize_uploads( $c, @_ ) }
1952 =head2 $c->get_action( $action, $namespace )
1954 Gets an action in a given namespace.
1958 sub get_action { my $c = shift; $c->dispatcher->get_action(@_) }
1960 =head2 $c->get_actions( $action, $namespace )
1962 Gets all actions of a given name in a namespace and all parent
1967 sub get_actions { my $c = shift; $c->dispatcher->get_actions( $c, @_ ) }
1969 =head2 $app->handle_request( @arguments )
1971 Called to handle each HTTP request.
1975 sub handle_request {
1976 my ( $class, @arguments ) = @_;
1978 # Always expect worst case!
1981 if ($class->debug) {
1982 my $secs = time - $START || 1;
1983 my $av = sprintf '%.3f', $COUNT / $secs;
1984 my $time = localtime time;
1985 $class->log->info("*** Request $COUNT ($av/s) [$$] [$time] ***");
1988 my $c = $class->prepare(@arguments);
1990 $status = $c->finalize;
1993 chomp(my $error = $_);
1994 $class->log->error(qq/Caught exception in engine "$error"/);
1999 if(my $coderef = $class->log->can('_flush')){
2000 $class->log->$coderef();
2005 =head2 $class->prepare( @arguments )
2007 Creates a Catalyst context from an engine-specific request (Apache, CGI,
2014 predicate => '_has_uploadtmp',
2018 my ( $class, @arguments ) = @_;
2021 # After the app/ctxt split, this should become an attribute based on something passed
2022 # into the application.
2023 $class->context_class( ref $class || $class ) unless $class->context_class;
2025 my $uploadtmp = $class->config->{uploadtmp};
2026 my $c = $class->context_class->new({ $uploadtmp ? (_uploadtmp => $uploadtmp) : ()});
2028 $c->response->_context($c);
2030 #surely this is not the most efficient way to do things...
2031 $c->stats($class->stats_class->new)->enable($c->use_stats);
2032 if ( $c->debug || $c->config->{enable_catalyst_header} ) {
2033 $c->res->headers->header( 'X-Catalyst' => $Catalyst::VERSION );
2037 # Allow engine to direct the prepare flow (for POE)
2038 if ( my $prepare = $c->engine->can('prepare') ) {
2039 $c->engine->$prepare( $c, @arguments );
2042 $c->prepare_request(@arguments);
2043 $c->prepare_connection;
2044 $c->prepare_query_parameters;
2045 $c->prepare_headers; # Just hooks, no longer needed - they just
2046 $c->prepare_cookies; # cause the lazy attribute on req to build
2049 # Prepare the body for reading, either by prepare_body
2050 # or the user, if they are using $c->read
2053 # Parse the body unless the user wants it on-demand
2054 unless ( ref($c)->config->{parse_on_demand} ) {
2060 # VERY ugly and probably shouldn't rely on ->finalize actually working
2062 # failed prepare is always due to an invalid request, right?
2063 $c->response->status(400);
2064 $c->response->content_type('text/plain');
2065 $c->response->body('Bad Request');
2066 # Note we call finalize and then die here, which escapes
2067 # finalize being called in the enclosing block..
2068 # It in fact couldn't be called, as we don't return $c..
2069 # This is a mess - but I'm unsure you can fix this without
2070 # breaking compat for people doing crazy things (we should set
2071 # the 400 and just return the ctx here IMO, letting finalize get called
2082 =head2 $c->prepare_action
2084 Prepares action. See L<Catalyst::Dispatcher>.
2088 sub prepare_action { my $c = shift; $c->dispatcher->prepare_action( $c, @_ ) }
2090 =head2 $c->prepare_body
2092 Prepares message body.
2099 return if $c->request->_has_body;
2101 # Initialize on-demand data
2102 $c->engine->prepare_body( $c, @_ );
2103 $c->prepare_parameters;
2104 $c->prepare_uploads;
2107 =head2 $c->prepare_body_chunk( $chunk )
2109 Prepares a chunk of data before sending it to L<HTTP::Body>.
2111 See L<Catalyst::Engine>.
2115 sub prepare_body_chunk {
2117 $c->engine->prepare_body_chunk( $c, @_ );
2120 =head2 $c->prepare_body_parameters
2122 Prepares body parameters.
2126 sub prepare_body_parameters {
2128 $c->engine->prepare_body_parameters( $c, @_ );
2131 =head2 $c->prepare_connection
2133 Prepares connection.
2137 sub prepare_connection {
2139 # XXX - This is called on the engine (not the request) to maintain
2140 # Engine::PSGI back compat.
2141 $c->engine->prepare_connection($c);
2144 =head2 $c->prepare_cookies
2146 Prepares cookies by ensuring that the attribute on the request
2147 object has been built.
2151 sub prepare_cookies { my $c = shift; $c->request->cookies }
2153 =head2 $c->prepare_headers
2155 Prepares request headers by ensuring that the attribute on the request
2156 object has been built.
2160 sub prepare_headers { my $c = shift; $c->request->headers }
2162 =head2 $c->prepare_parameters
2164 Prepares parameters.
2168 sub prepare_parameters {
2170 $c->prepare_body_parameters;
2171 $c->engine->prepare_parameters( $c, @_ );
2174 =head2 $c->prepare_path
2176 Prepares path and base.
2180 sub prepare_path { my $c = shift; $c->engine->prepare_path( $c, @_ ) }
2182 =head2 $c->prepare_query_parameters
2184 Prepares query parameters.
2188 sub prepare_query_parameters {
2191 $c->engine->prepare_query_parameters( $c, @_ );
2194 =head2 $c->log_request
2196 Writes information about the request to the debug logs. This includes:
2200 =item * Request method, path, and remote IP address
2202 =item * Query keywords (see L<Catalyst::Request/query_keywords>)
2204 =item * Request parameters
2206 =item * File uploads
2215 return unless $c->debug;
2217 my($dump) = grep {$_->[0] eq 'Request' } $c->dump_these;
2218 my $request = $dump->[1];
2220 my ( $method, $path, $address ) = ( $request->method, $request->path, $request->address );
2222 $path = '/' unless length $path;
2224 $c->log->debug(qq/"$method" request for "$path" from "$address"/);
2226 $c->log_request_headers($request->headers);
2228 if ( my $keywords = $request->query_keywords ) {
2229 $c->log->debug("Query keywords are: $keywords");
2232 $c->log_request_parameters( query => $request->query_parameters, $request->_has_body ? (body => $request->body_parameters) : () );
2234 $c->log_request_uploads($request);
2237 =head2 $c->log_response
2239 Writes information about the response to the debug logs by calling
2240 C<< $c->log_response_status_line >> and C<< $c->log_response_headers >>.
2247 return unless $c->debug;
2249 my($dump) = grep {$_->[0] eq 'Response' } $c->dump_these;
2250 my $response = $dump->[1];
2252 $c->log_response_status_line($response);
2253 $c->log_response_headers($response->headers);
2256 =head2 $c->log_response_status_line($response)
2258 Writes one line of information about the response to the debug logs. This includes:
2262 =item * Response status code
2264 =item * Content-Type header (if present)
2266 =item * Content-Length header (if present)
2272 sub log_response_status_line {
2273 my ($c, $response) = @_;
2277 'Response Code: %s; Content-Type: %s; Content-Length: %s',
2278 $response->status || 'unknown',
2279 $response->headers->header('Content-Type') || 'unknown',
2280 $response->headers->header('Content-Length') || 'unknown'
2285 =head2 $c->log_response_headers($headers);
2287 Hook method which can be wrapped by plugins to log the response headers.
2288 No-op in the default implementation.
2292 sub log_response_headers {}
2294 =head2 $c->log_request_parameters( query => {}, body => {} )
2296 Logs request parameters to debug logs
2300 sub log_request_parameters {
2302 my %all_params = @_;
2304 return unless $c->debug;
2306 my $column_width = Catalyst::Utils::term_width() - 44;
2307 foreach my $type (qw(query body)) {
2308 my $params = $all_params{$type};
2309 next if ! keys %$params;
2310 my $t = Text::SimpleTable->new( [ 35, 'Parameter' ], [ $column_width, 'Value' ] );
2311 for my $key ( sort keys %$params ) {
2312 my $param = $params->{$key};
2313 my $value = defined($param) ? $param : '';
2314 $t->row( $key, ref $value eq 'ARRAY' ? ( join ', ', @$value ) : $value );
2316 $c->log->debug( ucfirst($type) . " Parameters are:\n" . $t->draw );
2320 =head2 $c->log_request_uploads
2322 Logs file uploads included in the request to the debug logs.
2323 The parameter name, filename, file type, and file size are all included in
2328 sub log_request_uploads {
2330 my $request = shift;
2331 return unless $c->debug;
2332 my $uploads = $request->uploads;
2333 if ( keys %$uploads ) {
2334 my $t = Text::SimpleTable->new(
2335 [ 12, 'Parameter' ],
2340 for my $key ( sort keys %$uploads ) {
2341 my $upload = $uploads->{$key};
2342 for my $u ( ref $upload eq 'ARRAY' ? @{$upload} : ($upload) ) {
2343 $t->row( $key, $u->filename, $u->type, $u->size );
2346 $c->log->debug( "File Uploads are:\n" . $t->draw );
2350 =head2 $c->log_request_headers($headers);
2352 Hook method which can be wrapped by plugins to log the request headers.
2353 No-op in the default implementation.
2357 sub log_request_headers {}
2359 =head2 $c->log_headers($type => $headers)
2361 Logs L<HTTP::Headers> (either request or response) to the debug logs.
2368 my $headers = shift; # an HTTP::Headers instance
2370 return unless $c->debug;
2372 my $column_width = Catalyst::Utils::term_width() - 28;
2373 my $t = Text::SimpleTable->new( [ 15, 'Header Name' ], [ $column_width, 'Value' ] );
2376 my ( $name, $value ) = @_;
2377 $t->row( $name, $value );
2380 $c->log->debug( ucfirst($type) . " Headers:\n" . $t->draw );
2384 =head2 $c->prepare_read
2386 Prepares the input for reading.
2390 sub prepare_read { my $c = shift; $c->engine->prepare_read( $c, @_ ) }
2392 =head2 $c->prepare_request
2394 Prepares the engine request.
2398 sub prepare_request { my $c = shift; $c->engine->prepare_request( $c, @_ ) }
2400 =head2 $c->prepare_uploads
2406 sub prepare_uploads {
2409 $c->engine->prepare_uploads( $c, @_ );
2412 =head2 $c->prepare_write
2414 Prepares the output for writing.
2418 sub prepare_write { my $c = shift; $c->engine->prepare_write( $c, @_ ) }
2420 =head2 $c->request_class
2422 Returns or sets the request class. Defaults to L<Catalyst::Request>.
2424 =head2 $c->response_class
2426 Returns or sets the response class. Defaults to L<Catalyst::Response>.
2428 =head2 $c->read( [$maxlength] )
2430 Reads a chunk of data from the request body. This method is designed to
2431 be used in a while loop, reading C<$maxlength> bytes on every call.
2432 C<$maxlength> defaults to the size of the request if not specified.
2434 You have to set C<< MyApp->config(parse_on_demand => 1) >> to use this
2437 Warning: If you use read(), Catalyst will not process the body,
2438 so you will not be able to access POST parameters or file uploads via
2439 $c->request. You must handle all body parsing yourself.
2443 sub read { my $c = shift; return $c->request->read( @_ ) }
2453 $app->_make_immutable_if_needed;
2454 $app->engine_loader->needs_psgi_engine_compat_hack ?
2455 $app->engine->run($app, @_) :
2456 $app->engine->run( $app, $app->_finalized_psgi_app, @_ );
2459 sub _make_immutable_if_needed {
2461 my $meta = Class::MOP::get_metaclass_by_name($class);
2462 my $isa_ca = $class->isa('Class::Accessor::Fast') || $class->isa('Class::Accessor');
2465 && ! { $meta->immutable_options }->{replace_constructor}
2468 warn("You made your application class ($class) immutable, "
2469 . "but did not inline the\nconstructor. "
2470 . "This will break catalyst, as your app \@ISA "
2471 . "Class::Accessor(::Fast)?\nPlease pass "
2472 . "(replace_constructor => 1)\nwhen making your class immutable.\n");
2474 unless ($meta->is_immutable) {
2475 # XXX - FIXME warning here as you should make your app immutable yourself.
2476 $meta->make_immutable(
2477 replace_constructor => 1,
2482 =head2 $c->set_action( $action, $code, $namespace, $attrs )
2484 Sets an action in a given namespace.
2488 sub set_action { my $c = shift; $c->dispatcher->set_action( $c, @_ ) }
2490 =head2 $c->setup_actions($component)
2492 Sets up actions for a component.
2496 sub setup_actions { my $c = shift; $c->dispatcher->setup_actions( $c, @_ ) }
2498 =head2 $c->setup_components
2500 This method is called internally to set up the application's components.
2502 It finds modules by calling the L<locate_components> method, expands them to
2503 package names with the L<expand_component_module> method, and then installs
2504 each component into the application.
2506 The C<setup_components> config option is passed to both of the above methods.
2508 Installation of each component is performed by the L<setup_component> method,
2513 sub setup_components {
2516 my $config = $class->config->{ setup_components };
2518 my @comps = $class->locate_components($config);
2519 my %comps = map { $_ => 1 } @comps;
2521 my $deprecatedcatalyst_component_names = grep { /::[CMV]::/ } @comps;
2522 $class->log->warn(qq{Your application is using the deprecated ::[MVC]:: type naming scheme.\n}.
2523 qq{Please switch your class names to ::Model::, ::View:: and ::Controller: as appropriate.\n}
2524 ) if $deprecatedcatalyst_component_names;
2526 for my $component ( @comps ) {
2528 # We pass ignore_loaded here so that overlay files for (e.g.)
2529 # Model::DBI::Schema sub-classes are loaded - if it's in @comps
2530 # we know M::P::O found a file on disk so this is safe
2532 Catalyst::Utils::ensure_class_loaded( $component, { ignore_loaded => 1 } );
2535 for my $component (@comps) {
2536 my $instance = $class->components->{ $component } = $class->setup_component($component);
2537 my @expanded_components = $instance->can('expand_modules')
2538 ? $instance->expand_modules( $component, $config )
2539 : $class->expand_component_module( $component, $config );
2540 for my $component (@expanded_components) {
2541 next if $comps{$component};
2542 $class->components->{ $component } = $class->setup_component($component);
2547 =head2 $c->locate_components( $setup_component_config )
2549 This method is meant to provide a list of component modules that should be
2550 setup for the application. By default, it will use L<Module::Pluggable>.
2552 Specify a C<setup_components> config option to pass additional options directly
2553 to L<Module::Pluggable>. To add additional search paths, specify a key named
2554 C<search_extra> as an array reference. Items in the array beginning with C<::>
2555 will have the application class name prepended to them.
2559 sub locate_components {
2563 my @paths = qw( ::Controller ::C ::Model ::M ::View ::V );
2564 my $extra = delete $config->{ search_extra } || [];
2566 push @paths, @$extra;
2568 my $locator = Module::Pluggable::Object->new(
2569 search_path => [ map { s/^(?=::)/$class/; $_; } @paths ],
2573 # XXX think about ditching this sort entirely
2574 my @comps = sort { length $a <=> length $b } $locator->plugins;
2579 =head2 $c->expand_component_module( $component, $setup_component_config )
2581 Components found by C<locate_components> will be passed to this method, which
2582 is expected to return a list of component (package) names to be set up.
2586 sub expand_component_module {
2587 my ($class, $module) = @_;
2588 return Devel::InnerPackage::list_packages( $module );
2591 =head2 $c->setup_component
2595 sub setup_component {
2596 my( $class, $component ) = @_;
2598 unless ( $component->can( 'COMPONENT' ) ) {
2602 my $suffix = Catalyst::Utils::class2classsuffix( $component );
2603 my $config = $class->config->{ $suffix } || {};
2604 # Stash catalyst_component_name in the config here, so that custom COMPONENT
2605 # methods also pass it. local to avoid pointlessly shitting in config
2606 # for the debug screen, as $component is already the key name.
2607 local $config->{catalyst_component_name} = $component;
2609 my $instance = eval { $component->COMPONENT( $class, $config ); };
2611 if ( my $error = $@ ) {
2613 Catalyst::Exception->throw(
2614 message => qq/Couldn't instantiate component "$component", "$error"/
2618 unless (blessed $instance) {
2619 my $metaclass = Moose::Util::find_meta($component);
2620 my $method_meta = $metaclass->find_method_by_name('COMPONENT');
2621 my $component_method_from = $method_meta->associated_metaclass->name;
2622 my $value = defined($instance) ? $instance : 'undef';
2623 Catalyst::Exception->throw(
2625 qq/Couldn't instantiate component "$component", COMPONENT() method (from $component_method_from) didn't return an object-like value (value was $value)./
2631 =head2 $c->setup_dispatcher
2637 sub setup_dispatcher {
2638 my ( $class, $dispatcher ) = @_;
2641 $dispatcher = 'Catalyst::Dispatcher::' . $dispatcher;
2644 if ( my $env = Catalyst::Utils::env_value( $class, 'DISPATCHER' ) ) {
2645 $dispatcher = 'Catalyst::Dispatcher::' . $env;
2648 unless ($dispatcher) {
2649 $dispatcher = $class->dispatcher_class;
2652 Class::MOP::load_class($dispatcher);
2654 # dispatcher instance
2655 $class->dispatcher( $dispatcher->new );
2658 =head2 $c->setup_engine
2665 my ($class, $requested_engine) = @_;
2667 if (!$class->engine_loader || $requested_engine) {
2668 $class->engine_loader(
2669 Catalyst::EngineLoader->new({
2670 application_name => $class,
2671 (defined $requested_engine
2672 ? (catalyst_engine_class => $requested_engine) : ()),
2677 $class->engine_loader->catalyst_engine_class;
2681 my ($class, $requested_engine) = @_;
2684 my $loader = $class->engine_loader;
2686 if (!$loader || $requested_engine) {
2687 $loader = Catalyst::EngineLoader->new({
2688 application_name => $class,
2689 (defined $requested_engine
2690 ? (requested_engine => $requested_engine) : ()),
2693 $class->engine_loader($loader);
2696 $loader->catalyst_engine_class;
2699 # Don't really setup_engine -- see _setup_psgi_app for explanation.
2700 return if $class->loading_psgi_file;
2702 Class::MOP::load_class($engine);
2704 if ($ENV{MOD_PERL}) {
2705 my $apache = $class->engine_loader->auto;
2707 my $meta = find_meta($class);
2708 my $was_immutable = $meta->is_immutable;
2709 my %immutable_options = $meta->immutable_options;
2710 $meta->make_mutable if $was_immutable;
2712 $meta->add_method(handler => sub {
2714 my $psgi_app = $class->_finalized_psgi_app;
2715 $apache->call_app($r, $psgi_app);
2718 $meta->make_immutable(%immutable_options) if $was_immutable;
2721 $class->engine( $engine->new );
2726 sub _finalized_psgi_app {
2729 unless ($app->_psgi_app) {
2730 my $psgi_app = $app->_setup_psgi_app;
2731 $app->_psgi_app($psgi_app);
2734 return $app->_psgi_app;
2737 sub _setup_psgi_app {
2740 for my $home (Path::Class::Dir->new($app->config->{home})) {
2741 my $psgi_file = $home->file(
2742 Catalyst::Utils::appprefix($app) . '.psgi',
2745 next unless -e $psgi_file;
2747 # If $psgi_file calls ->setup_engine, it's doing so to load
2748 # Catalyst::Engine::PSGI. But if it does that, we're only going to
2749 # throw away the loaded PSGI-app and load the 5.9 Catalyst::Engine
2750 # anyway. So set a flag (ick) that tells setup_engine not to populate
2751 # $c->engine or do any other things we might regret.
2753 $app->loading_psgi_file(1);
2754 my $psgi_app = Plack::Util::load_psgi($psgi_file);
2755 $app->loading_psgi_file(0);
2758 unless $app->engine_loader->needs_psgi_engine_compat_hack;
2761 Found a legacy Catalyst::Engine::PSGI .psgi file at ${psgi_file}.
2763 Its content has been ignored. Please consult the Catalyst::Upgrading
2764 documentation on how to upgrade from Catalyst::Engine::PSGI.
2768 return $app->apply_default_middlewares($app->psgi_app);
2771 =head2 $c->apply_default_middlewares
2773 Adds the following L<Plack> middlewares to your application, since they are
2774 useful and commonly needed:
2776 L<Plack::Middleware::ReverseProxy>, (conditionally added based on the status
2777 of your $ENV{REMOTE_ADDR}, and can be forced on with C<using_frontend_proxy>
2778 or forced off with C<ignore_frontend_proxy>), L<Plack::Middleware::LighttpdScriptNameFix>
2779 (if you are using Lighttpd), L<Plack::Middleware::IIS6ScriptNameFix> (always
2780 applied since this middleware is smart enough to conditionally apply itself).
2782 Additionally if we detect we are using Nginx, we add a bit of custom middleware
2783 to solve some problems with the way that server handles $ENV{PATH_INFO} and
2789 sub apply_default_middlewares {
2790 my ($app, $psgi_app) = @_;
2792 $psgi_app = Plack::Middleware::Conditional->wrap(
2794 builder => sub { Plack::Middleware::ReverseProxy->wrap($_[0]) },
2797 return if $app->config->{ignore_frontend_proxy};
2798 return $env->{REMOTE_ADDR} eq '127.0.0.1'
2799 || $app->config->{using_frontend_proxy};
2803 # If we're running under Lighttpd, swap PATH_INFO and SCRIPT_NAME
2804 # http://lists.scsys.co.uk/pipermail/catalyst/2006-June/008361.html
2805 $psgi_app = Plack::Middleware::Conditional->wrap(
2807 builder => sub { Plack::Middleware::LighttpdScriptNameFix->wrap($_[0]) },
2810 return unless $env->{SERVER_SOFTWARE} && $env->{SERVER_SOFTWARE} =~ m!lighttpd[-/]1\.(\d+\.\d+)!;
2811 return unless $1 < 4.23;
2816 # we're applying this unconditionally as the middleware itself already makes
2817 # sure it doesn't fuck things up if it's not running under one of the right
2819 $psgi_app = Plack::Middleware::IIS6ScriptNameFix->wrap($psgi_app);
2821 # And another IIS issue, this time with IIS7.
2822 $psgi_app = Plack::Middleware::Conditional->wrap(
2824 builder => sub { Plack::Middleware::IIS7KeepAliveFix->wrap($_[0]) },
2827 return $env->{SERVER_SOFTWARE} && $env->{SERVER_SOFTWARE} =~ m!IIS/7\.[0-9]!;
2836 Returns a PSGI application code reference for the catalyst application
2837 C<$c>. This is the bare application without any middlewares
2838 applied. C<${myapp}.psgi> is not taken into account.
2840 This is what you want to be using to retrieve the PSGI application code
2841 reference of your Catalyst application for use in F<.psgi> files.
2847 return $app->engine->build_psgi_app($app);
2850 =head2 $c->setup_home
2852 Sets up the home directory.
2857 my ( $class, $home ) = @_;
2859 if ( my $env = Catalyst::Utils::env_value( $class, 'HOME' ) ) {
2863 $home ||= Catalyst::Utils::home($class);
2866 #I remember recently being scolded for assigning config values like this
2867 $class->config->{home} ||= $home;
2868 $class->config->{root} ||= Path::Class::Dir->new($home)->subdir('root');
2872 =head2 $c->setup_log
2874 Sets up log by instantiating a L<Catalyst::Log|Catalyst::Log> object and
2875 passing it to C<log()>. Pass in a comma-delimited list of levels to set the
2878 This method also installs a C<debug> method that returns a true value into the
2879 catalyst subclass if the "debug" level is passed in the comma-delimited list,
2880 or if the C<$CATALYST_DEBUG> environment variable is set to a true value.
2882 Note that if the log has already been setup, by either a previous call to
2883 C<setup_log> or by a call such as C<< __PACKAGE__->log( MyLogger->new ) >>,
2884 that this method won't actually set up the log object.
2889 my ( $class, $levels ) = @_;
2892 $levels =~ s/^\s+//;
2893 $levels =~ s/\s+$//;
2894 my %levels = map { $_ => 1 } split /\s*,\s*/, $levels;
2896 my $env_debug = Catalyst::Utils::env_value( $class, 'DEBUG' );
2897 if ( defined $env_debug ) {
2898 $levels{debug} = 1 if $env_debug; # Ugly!
2899 delete($levels{debug}) unless $env_debug;
2902 unless ( $class->log ) {
2903 $class->log( Catalyst::Log->new(keys %levels) );
2906 if ( $levels{debug} ) {
2907 Class::MOP::get_metaclass_by_name($class)->add_method('debug' => sub { 1 });
2908 $class->log->debug('Debug messages enabled');
2912 =head2 $c->setup_plugins
2918 =head2 $c->setup_stats
2920 Sets up timing statistics class.
2925 my ( $class, $stats ) = @_;
2927 Catalyst::Utils::ensure_class_loaded($class->stats_class);
2929 my $env = Catalyst::Utils::env_value( $class, 'STATS' );
2930 if ( defined($env) ? $env : ($stats || $class->debug ) ) {
2931 Class::MOP::get_metaclass_by_name($class)->add_method('use_stats' => sub { 1 });
2932 $class->log->debug('Statistics enabled');
2937 =head2 $c->registered_plugins
2939 Returns a sorted list of the plugins which have either been stated in the
2942 If passed a given plugin name, it will report a boolean value indicating
2943 whether or not that plugin is loaded. A fully qualified name is required if
2944 the plugin name does not begin with C<Catalyst::Plugin::>.
2946 if ($c->registered_plugins('Some::Plugin')) {
2954 sub registered_plugins {
2956 return sort keys %{ $proto->_plugins } unless @_;
2958 return 1 if exists $proto->_plugins->{$plugin};
2959 return exists $proto->_plugins->{"Catalyst::Plugin::$plugin"};
2962 sub _register_plugin {
2963 my ( $proto, $plugin, $instant ) = @_;
2964 my $class = ref $proto || $proto;
2966 Class::MOP::load_class( $plugin );
2967 $class->log->warn( "$plugin inherits from 'Catalyst::Component' - this is deprecated and will not work in 5.81" )
2968 if $plugin->isa( 'Catalyst::Component' );
2969 my $plugin_meta = Moose::Meta::Class->create($plugin);
2970 if (!$plugin_meta->has_method('new')
2971 && ( $plugin->isa('Class::Accessor::Fast') || $plugin->isa('Class::Accessor') ) ) {
2972 $plugin_meta->add_method('new', Moose::Object->meta->get_method('new'))
2974 if (!$instant && !$proto->_plugins->{$plugin}) {
2975 my $meta = Class::MOP::get_metaclass_by_name($class);
2976 $meta->superclasses($plugin, $meta->superclasses);
2978 $proto->_plugins->{$plugin} = 1;
2983 my ( $class, $plugins ) = @_;
2985 $class->_plugins( {} ) unless $class->_plugins;
2986 $plugins = Data::OptList::mkopt($plugins || []);
2989 [ Catalyst::Utils::resolve_namespace(
2990 $class . '::Plugin',
2991 'Catalyst::Plugin', $_->[0]
2997 for my $plugin ( reverse @plugins ) {
2998 Class::MOP::load_class($plugin->[0], $plugin->[1]);
2999 my $meta = find_meta($plugin->[0]);
3000 next if $meta && $meta->isa('Moose::Meta::Role');
3002 $class->_register_plugin($plugin->[0]);
3006 map { $_->[0]->name, $_->[1] }
3007 grep { blessed($_->[0]) && $_->[0]->isa('Moose::Meta::Role') }
3008 map { [find_meta($_->[0]), $_->[1]] }
3011 Moose::Util::apply_all_roles(
3019 Returns an arrayref of the internal execution stack (actions that are
3020 currently executing).
3024 Returns the current timing statistics object. By default Catalyst uses
3025 L<Catalyst::Stats|Catalyst::Stats>, but can be set otherwise with
3026 L<< stats_class|/"$c->stats_class" >>.
3028 Even if L<< -Stats|/"-Stats" >> is not enabled, the stats object is still
3029 available. By enabling it with C< $c->stats->enabled(1) >, it can be used to
3030 profile explicitly, although MyApp.pm still won't profile nor output anything
3033 =head2 $c->stats_class
3035 Returns or sets the stats (timing statistics) class. L<Catalyst::Stats|Catalyst::Stats> is used by default.
3037 =head2 $c->use_stats
3039 Returns 1 when L<< stats collection|/"-Stats" >> is enabled.
3041 Note that this is a static method, not an accessor and should be overridden
3042 by declaring C<sub use_stats { 1 }> in your MyApp.pm, not by calling C<< $c->use_stats(1) >>.
3049 =head2 $c->write( $data )
3051 Writes $data to the output stream. When using this method directly, you
3052 will need to manually set the C<Content-Length> header to the length of
3053 your output data, if known.
3060 # Finalize headers if someone manually writes output (for compat)
3061 $c->finalize_headers;
3063 return $c->response->write( @_ );
3068 Returns the Catalyst version number. Mostly useful for "powered by"
3069 messages in template systems.
3073 sub version { return $Catalyst::VERSION }
3075 =head1 CONFIGURATION
3077 There are a number of 'base' config variables which can be set:
3083 C<default_model> - The default model picked if you say C<< $c->model >>. See L<< /$c->model($name) >>.
3087 C<default_view> - The default view to be rendered or returned when C<< $c->view >> is called. See L<< /$c->view($name) >>.
3091 C<disable_component_resolution_regex_fallback> - Turns
3092 off the deprecated component resolution functionality so
3093 that if any of the component methods (e.g. C<< $c->controller('Foo') >>)
3094 are called then regex search will not be attempted on string values and
3095 instead C<undef> will be returned.
3099 C<home> - The application home directory. In an uninstalled application,
3100 this is the top level application directory. In an installed application,
3101 this will be the directory containing C<< MyApp.pm >>.
3105 C<ignore_frontend_proxy> - See L</PROXY SUPPORT>
3109 C<name> - The name of the application in debug messages and the debug and
3114 C<parse_on_demand> - The request body (for example file uploads) will not be parsed
3115 until it is accessed. This allows you to (for example) check authentication (and reject
3116 the upload) before actually receiving all the data. See L</ON-DEMAND PARSER>
3120 C<root> - The root directory for templates. Usually this is just a
3121 subdirectory of the home directory, but you can set it to change the
3122 templates to a different directory.
3126 C<search_extra> - Array reference passed to Module::Pluggable to for additional
3127 namespaces from which components will be loaded (and constructed and stored in
3128 C<< $c->components >>).
3132 C<show_internal_actions> - If true, causes internal actions such as C<< _DISPATCH >>
3133 to be shown in hit debug tables in the test server.
3137 C<use_request_uri_for_path> - Controls if the C<REQUEST_URI> or C<PATH_INFO> environment
3138 variable should be used for determining the request path.
3140 Most web server environments pass the requested path to the application using environment variables,
3141 from which Catalyst has to reconstruct the request base (i.e. the top level path to / in the application,
3142 exposed as C<< $c->request->base >>) and the request path below that base.
3144 There are two methods of doing this, both of which have advantages and disadvantages. Which method is used
3145 is determined by the C<< $c->config(use_request_uri_for_path) >> setting (which can either be true or false).
3149 =item use_request_uri_for_path => 0
3151 This is the default (and the) traditional method that Catalyst has used for determining the path information.
3152 The path is generated from a combination of the C<PATH_INFO> and C<SCRIPT_NAME> environment variables.
3153 The allows the application to behave correctly when C<mod_rewrite> is being used to redirect requests
3154 into the application, as these variables are adjusted by mod_rewrite to take account for the redirect.
3156 However this method has the major disadvantage that it is impossible to correctly decode some elements
3157 of the path, as RFC 3875 says: "C<< Unlike a URI path, the PATH_INFO is not URL-encoded, and cannot
3158 contain path-segment parameters. >>" This means PATH_INFO is B<always> decoded, and therefore Catalyst
3159 can't distinguish / vs %2F in paths (in addition to other encoded values).
3161 =item use_request_uri_for_path => 1
3163 This method uses the C<REQUEST_URI> and C<SCRIPT_NAME> environment variables. As C<REQUEST_URI> is never
3164 decoded, this means that applications using this mode can correctly handle URIs including the %2F character
3165 (i.e. with C<AllowEncodedSlashes> set to C<On> in Apache).
3167 Given that this method of path resolution is provably more correct, it is recommended that you use
3168 this unless you have a specific need to deploy your application in a non-standard environment, and you are
3169 aware of the implications of not being able to handle encoded URI paths correctly.
3171 However it also means that in a number of cases when the app isn't installed directly at a path, but instead
3172 is having paths rewritten into it (e.g. as a .cgi/fcgi in a public_html directory, with mod_rewrite in a
3173 .htaccess file, or when SSI is used to rewrite pages into the app, or when sub-paths of the app are exposed
3174 at other URIs than that which the app is 'normally' based at with C<mod_rewrite>), the resolution of
3175 C<< $c->request->base >> will be incorrect.
3181 C<using_frontend_proxy> - See L</PROXY SUPPORT>.
3185 =head1 INTERNAL ACTIONS
3187 Catalyst uses internal actions like C<_DISPATCH>, C<_BEGIN>, C<_AUTO>,
3188 C<_ACTION>, and C<_END>. These are by default not shown in the private
3189 action table, but you can make them visible with a config parameter.
3191 MyApp->config(show_internal_actions => 1);
3193 =head1 ON-DEMAND PARSER
3195 The request body is usually parsed at the beginning of a request,
3196 but if you want to handle input yourself, you can enable on-demand
3197 parsing with a config parameter.
3199 MyApp->config(parse_on_demand => 1);
3201 =head1 PROXY SUPPORT
3203 Many production servers operate using the common double-server approach,
3204 with a lightweight frontend web server passing requests to a larger
3205 backend server. An application running on the backend server must deal
3206 with two problems: the remote user always appears to be C<127.0.0.1> and
3207 the server's hostname will appear to be C<localhost> regardless of the
3208 virtual host that the user connected through.
3210 Catalyst will automatically detect this situation when you are running
3211 the frontend and backend servers on the same machine. The following
3212 changes are made to the request.
3214 $c->req->address is set to the user's real IP address, as read from
3215 the HTTP X-Forwarded-For header.
3217 The host value for $c->req->base and $c->req->uri is set to the real
3218 host, as read from the HTTP X-Forwarded-Host header.
3220 Additionally, you may be running your backend application on an insecure
3221 connection (port 80) while your frontend proxy is running under SSL. If there
3222 is a discrepancy in the ports, use the HTTP header C<X-Forwarded-Port> to
3223 tell Catalyst what port the frontend listens on. This will allow all URIs to
3224 be created properly.
3226 In the case of passing in:
3228 X-Forwarded-Port: 443
3230 All calls to C<uri_for> will result in an https link, as is expected.
3232 Obviously, your web server must support these headers for this to work.
3234 In a more complex server farm environment where you may have your
3235 frontend proxy server(s) on different machines, you will need to set a
3236 configuration option to tell Catalyst to read the proxied data from the
3239 MyApp->config(using_frontend_proxy => 1);
3241 If you do not wish to use the proxy support at all, you may set:
3243 MyApp->config(ignore_frontend_proxy => 0);
3245 =head2 Note about psgi files
3247 Note that if you supply your own .psgi file, calling
3248 C<< MyApp->psgi_app(@_); >>, then B<this will not happen automatically>.
3250 You either need to apply L<Plack::Middleware::ReverseProxy> yourself
3251 in your psgi, for example:
3254 enable "Plack::Middleware::ReverseProxy";
3258 This will unconditionally add the ReverseProxy support, or you need to call
3259 C<< $app = MyApp->apply_default_middlewares($app) >> (to conditionally
3260 apply the support depending upon your config).
3262 See L<Catalyst::PSGI> for more information.
3264 =head1 THREAD SAFETY
3266 Catalyst has been tested under Apache 2's threading C<mpm_worker>,
3267 C<mpm_winnt>, and the standalone forking HTTP server on Windows. We
3268 believe the Catalyst core to be thread-safe.
3270 If you plan to operate in a threaded environment, remember that all other
3271 modules you are using must also be thread-safe. Some modules, most notably
3272 L<DBD::SQLite>, are not thread-safe.
3278 Join #catalyst on irc.perl.org.
3282 http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/catalyst
3283 http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/catalyst-dev
3287 http://catalyst.perl.org
3291 http://dev.catalyst.perl.org
3295 =head2 L<Task::Catalyst> - All you need to start with Catalyst
3297 =head2 L<Catalyst::Manual> - The Catalyst Manual
3299 =head2 L<Catalyst::Component>, L<Catalyst::Controller> - Base classes for components
3301 =head2 L<Catalyst::Engine> - Core engine
3303 =head2 L<Catalyst::Log> - Log class.
3305 =head2 L<Catalyst::Request> - Request object
3307 =head2 L<Catalyst::Response> - Response object
3309 =head2 L<Catalyst::Test> - The test suite.
3311 =head1 PROJECT FOUNDER
3313 sri: Sebastian Riedel <sri@cpan.org>
3319 acme: Leon Brocard <leon@astray.com>
3321 abraxxa: Alexander Hartmaier <abraxxa@cpan.org>
3325 Andrew Ford E<lt>A.Ford@ford-mason.co.ukE<gt>
3329 andyg: Andy Grundman <andy@hybridized.org>
3331 audreyt: Audrey Tang
3333 bricas: Brian Cassidy <bricas@cpan.org>
3335 Caelum: Rafael Kitover <rkitover@io.com>
3337 chansen: Christian Hansen
3339 chicks: Christopher Hicks
3341 Chisel Wright C<pause@herlpacker.co.uk>
3343 Danijel Milicevic C<me@danijel.de>
3345 David Kamholz E<lt>dkamholz@cpan.orgE<gt>
3347 David Naughton, C<naughton@umn.edu>
3351 dhoss: Devin Austin <dhoss@cpan.org>
3353 dkubb: Dan Kubb <dan.kubb-cpan@onautopilot.com>
3357 dwc: Daniel Westermann-Clark <danieltwc@cpan.org>
3359 esskar: Sascha Kiefer
3361 fireartist: Carl Franks <cfranks@cpan.org>
3363 frew: Arthur Axel "fREW" Schmidt <frioux@gmail.com>
3365 gabb: Danijel Milicevic
3369 Gavin Henry C<ghenry@perl.me.uk>
3373 groditi: Guillermo Roditi <groditi@gmail.com>
3375 hobbs: Andrew Rodland <andrew@cleverdomain.org>
3377 ilmari: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
3379 jcamacho: Juan Camacho
3381 jester: Jesse Sheidlower C<jester@panix.com>
3383 jhannah: Jay Hannah <jay@jays.net>
3389 jon: Jon Schutz <jjschutz@cpan.org>
3391 Jonathan Rockway C<< <jrockway@cpan.org> >>
3393 Kieren Diment C<kd@totaldatasolution.com>
3395 konobi: Scott McWhirter <konobi@cpan.org>
3397 marcus: Marcus Ramberg <mramberg@cpan.org>
3399 miyagawa: Tatsuhiko Miyagawa <miyagawa@bulknews.net>
3401 mgrimes: Mark Grimes <mgrimes@cpan.org>
3403 mst: Matt S. Trout <mst@shadowcatsystems.co.uk>
3407 naughton: David Naughton
3409 ningu: David Kamholz <dkamholz@cpan.org>
3411 nothingmuch: Yuval Kogman <nothingmuch@woobling.org>
3413 numa: Dan Sully <daniel@cpan.org>
3419 omega: Andreas Marienborg
3421 Oleg Kostyuk <cub.uanic@gmail.com>
3423 phaylon: Robert Sedlacek <phaylon@dunkelheit.at>
3425 rafl: Florian Ragwitz <rafl@debian.org>
3427 random: Roland Lammel <lammel@cpan.org>
3429 Robert Sedlacek C<< <rs@474.at> >>
3431 SpiceMan: Marcel Montes
3435 szbalint: Balint Szilakszi <szbalint@cpan.org>
3437 t0m: Tomas Doran <bobtfish@bobtfish.net>
3441 Viljo Marrandi C<vilts@yahoo.com>
3443 Will Hawes C<info@whawes.co.uk>
3445 willert: Sebastian Willert <willert@cpan.org>
3447 wreis: Wallace Reis <wallace@reis.org.br>
3449 Yuval Kogman, C<nothingmuch@woobling.org>
3451 rainboxx: Matthias Dietrich, C<perl@rainboxx.de>
3453 dd070: Dhaval Dhanani <dhaval070@gmail.com>
3457 Copyright (c) 2005, the above named PROJECT FOUNDER and CONTRIBUTORS.
3461 This library is free software. You can redistribute it and/or modify it under
3462 the same terms as Perl itself.
3468 __PACKAGE__->meta->make_immutable;