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 Moose::Util 'find_meta';
39 use Plack::Middleware::Conditional;
40 use Plack::Middleware::ReverseProxy;
41 use Plack::Middleware::IIS6ScriptNameFix;
42 use Plack::Middleware::IIS7KeepAliveFix;
43 use Plack::Middleware::LighttpdScriptNameFix;
44 use Plack::Middleware::ContentLength;
45 use Plack::Middleware::Head;
46 use Plack::Middleware::HTTPExceptions;
47 use Plack::Middleware::FixMissingBodyInRedirect;
48 use Plack::Middleware::MethodOverride;
49 use Plack::Middleware::RemoveRedundantBody;
50 use Catalyst::Middleware::Stash;
52 use Class::Load 'load_class';
53 use Encode 2.21 'decode_utf8', 'encode_utf8';
55 BEGIN { require 5.008003; }
57 has stack => (is => 'ro', default => sub { [] });
58 has state => (is => 'rw', default => 0);
59 has stats => (is => 'rw');
60 has action => (is => 'rw');
61 has counter => (is => 'rw', default => sub { {} });
66 my $class = ref $self;
67 my $composed_request_class = $class->composed_request_class;
68 return $composed_request_class->new( $self->_build_request_constructor_args);
72 sub _build_request_constructor_args {
74 my %p = ( _log => $self->log );
75 $p{_uploadtmp} = $self->_uploadtmp if $self->_has_uploadtmp;
76 $p{data_handlers} = {$self->registered_data_handlers};
77 $p{_use_hash_multivalue} = $self->config->{use_hash_multivalue_in_request}
78 if $self->config->{use_hash_multivalue_in_request};
82 sub composed_request_class {
84 my @traits = (@{$class->request_class_traits||[]}, @{$class->config->{request_class_traits}||[]});
86 # For each trait listed, figure out what the namespace is. First we try the $trait
87 # as it is in the config. Then try $MyApp::TraitFor::Request:$trait. Last we try
88 # Catalyst::TraitFor::Request::$trait. If none load, throw error.
90 my $trait_ns = 'TraitFor::Request';
91 my @normalized_traits = map {
92 Class::Load::load_first_existing_class($_, $class.'::'.$trait_ns.'::'. $_, 'Catalyst::'.$trait_ns.'::'.$_)
95 return $class->_composed_request_class ||
96 $class->_composed_request_class(Moose::Util::with_traits($class->request_class, @normalized_traits));
103 my $class = ref $self;
104 my $composed_response_class = $class->composed_response_class;
105 return $composed_response_class->new( $self->_build_response_constructor_args);
109 sub _build_response_constructor_args {
112 encoding => $_[0]->encoding,
116 sub composed_response_class {
118 my @traits = (@{$class->response_class_traits||[]}, @{$class->config->{response_class_traits}||[]});
120 my $trait_ns = 'TraitFor::Response';
121 my @normalized_traits = map {
122 Class::Load::load_first_existing_class($_, $class.'::'.$trait_ns.'::'. $_, 'Catalyst::'.$trait_ns.'::'.$_)
125 return $class->_composed_response_class ||
126 $class->_composed_response_class(Moose::Util::with_traits($class->response_class, @normalized_traits));
129 has namespace => (is => 'rw');
131 sub depth { scalar @{ shift->stack || [] }; }
132 sub comp { shift->component(@_) }
135 my $self = shift; return $self->request(@_);
138 my $self = shift; return $self->response(@_);
141 # For backwards compatibility
142 sub finalize_output { shift->finalize_body(@_) };
147 our $RECURSION = 1000;
148 our $DETACH = Catalyst::Exception::Detach->new;
149 our $GO = Catalyst::Exception::Go->new;
151 #I imagine that very few of these really
152 #need to be class variables. if any.
153 #maybe we should just make them attributes with a default?
154 __PACKAGE__->mk_classdata($_)
155 for qw/components arguments dispatcher engine log dispatcher_class
156 engine_loader context_class request_class response_class stats_class
157 setup_finished _psgi_app loading_psgi_file run_options _psgi_middleware
158 _data_handlers _encoding _encode_check finalized_default_middleware
159 request_class_traits response_class_traits stats_class_traits
160 _composed_request_class _composed_response_class _composed_stats_class/;
162 __PACKAGE__->dispatcher_class('Catalyst::Dispatcher');
163 __PACKAGE__->request_class('Catalyst::Request');
164 __PACKAGE__->response_class('Catalyst::Response');
165 __PACKAGE__->stats_class('Catalyst::Stats');
167 sub composed_stats_class {
169 my @traits = (@{$class->stats_class_traits||[]}, @{$class->config->{stats_class_traits}||[]});
171 my $trait_ns = 'TraitFor::Stats';
172 my @normalized_traits = map {
173 Class::Load::load_first_existing_class($_, $class.'::'.$trait_ns.'::'. $_, 'Catalyst::'.$trait_ns.'::'.$_)
176 return $class->_composed_stats_class ||
177 $class->_composed_stats_class(Moose::Util::with_traits($class->stats_class, @normalized_traits));
180 __PACKAGE__->_encode_check(Encode::FB_CROAK | Encode::LEAVE_SRC);
182 # Remember to update this in Catalyst::Runtime as well!
183 our $VERSION = '5.90095';
184 $VERSION = eval $VERSION if $VERSION =~ /_/; # numify for warning-free dev releases
187 my ( $class, @arguments ) = @_;
189 # We have to limit $class to Catalyst to avoid pushing Catalyst upon every
191 return unless $class eq 'Catalyst';
193 my $caller = caller();
194 return if $caller eq 'main';
196 my $meta = Moose::Meta::Class->initialize($caller);
197 unless ( $caller->isa('Catalyst') ) {
198 my @superclasses = ($meta->superclasses, $class, 'Catalyst::Controller');
199 $meta->superclasses(@superclasses);
201 # Avoid possible C3 issues if 'Moose::Object' is already on RHS of MyApp
202 $meta->superclasses(grep { $_ ne 'Moose::Object' } $meta->superclasses);
204 unless( $meta->has_method('meta') ){
205 if ($Moose::VERSION >= 1.15) {
206 $meta->_add_meta_method('meta');
209 $meta->add_method(meta => sub { Moose::Meta::Class->initialize("${caller}") } );
213 $caller->arguments( [@arguments] );
217 sub _application { $_[0] }
223 Catalyst - The Elegant MVC Web Application Framework
226 <a href="https://badge.fury.io/pl/Catalyst-Runtime"><img src="https://badge.fury.io/pl/Catalyst-Runtime.svg" alt="CPAN version" height="18"></a>
227 <a href="https://travis-ci.org/perl-catalyst/catalyst-runtime/"><img src="https://api.travis-ci.org/perl-catalyst/catalyst-runtime.png" alt="Catalyst></a>
228 <a href="http://cpants.cpanauthors.org/dist/Catalyst-Runtime"><img src="http://cpants.cpanauthors.org/dist/Catalyst-Runtime.png" alt='Kwalitee Score' /></a>
232 See the L<Catalyst::Manual> distribution for comprehensive
233 documentation and tutorials.
235 # Install Catalyst::Devel for helpers and other development tools
236 # use the helper to create a new application
239 # add models, views, controllers
240 script/myapp_create.pl model MyDatabase DBIC::Schema create=static dbi:SQLite:/path/to/db
241 script/myapp_create.pl view MyTemplate TT
242 script/myapp_create.pl controller Search
244 # built in testserver -- use -r to restart automatically on changes
245 # --help to see all available options
246 script/myapp_server.pl
248 # command line testing interface
249 script/myapp_test.pl /yada
252 use Catalyst qw/-Debug/; # include plugins here as well
254 ### In lib/MyApp/Controller/Root.pm (autocreated)
255 sub foo : Chained('/') Args() { # called for /foo, /foo/1, /foo/1/2, etc.
256 my ( $self, $c, @args ) = @_; # args are qw/1 2/ for /foo/1/2
257 $c->stash->{template} = 'foo.tt'; # set the template
258 # lookup something from db -- stash vars are passed to TT
260 $c->model('Database::Foo')->search( { country => $args[0] } );
261 if ( $c->req->params->{bar} ) { # access GET or POST parameters
262 $c->forward( 'bar' ); # process another action
263 # do something else after forward returns
267 # The foo.tt TT template can use the stash data from the database
268 [% WHILE (item = data.next) %]
272 # called for /bar/of/soap, /bar/of/soap/10, etc.
273 sub bar : Chained('/') PathPart('/bar/of/soap') Args() { ... }
275 # called after all actions are finished
277 my ( $self, $c ) = @_;
278 if ( scalar @{ $c->error } ) { ... } # handle errors
279 return if $c->res->body; # already have a response
280 $c->forward( 'MyApp::View::TT' ); # render template
283 See L<Catalyst::Manual::Intro> for additional information.
287 Catalyst is a modern framework for making web applications without the
288 pain usually associated with this process. This document is a reference
289 to the main Catalyst application. If you are a new user, we suggest you
290 start with L<Catalyst::Manual::Tutorial> or L<Catalyst::Manual::Intro>.
292 See L<Catalyst::Manual> for more documentation.
294 Catalyst plugins can be loaded by naming them as arguments to the "use
295 Catalyst" statement. Omit the C<Catalyst::Plugin::> prefix from the
296 plugin name, i.e., C<Catalyst::Plugin::My::Module> becomes
299 use Catalyst qw/My::Module/;
301 If your plugin starts with a name other than C<Catalyst::Plugin::>, you can
302 fully qualify the name by using a unary plus:
306 +Fully::Qualified::Plugin::Name
309 Special flags like C<-Debug> can also be specified as
310 arguments when Catalyst is loaded:
312 use Catalyst qw/-Debug My::Module/;
314 The position of plugins and flags in the chain is important, because
315 they are loaded in the order in which they appear.
317 The following flags are supported:
321 Enables debug output. You can also force this setting from the system
322 environment with CATALYST_DEBUG or <MYAPP>_DEBUG. The environment
323 settings override the application, with <MYAPP>_DEBUG having the highest
326 This sets the log level to 'debug' and enables full debug output on the
327 error screen. If you only want the latter, see L<< $c->debug >>.
331 Forces Catalyst to use a specific home directory, e.g.:
333 use Catalyst qw[-Home=/usr/mst];
335 This can also be done in the shell environment by setting either the
336 C<CATALYST_HOME> environment variable or C<MYAPP_HOME>; where C<MYAPP>
337 is replaced with the uppercased name of your application, any "::" in
338 the name will be replaced with underscores, e.g. MyApp::Web should use
339 MYAPP_WEB_HOME. If both variables are set, the MYAPP_HOME one will be used.
341 If none of these are set, Catalyst will attempt to automatically detect the
342 home directory. If you are working in a development environment, Catalyst
343 will try and find the directory containing either Makefile.PL, Build.PL,
344 dist.ini, or cpanfile. If the application has been installed into the system
345 (i.e. you have done C<make install>), then Catalyst will use the path to your
346 application module, without the .pm extension (e.g., /foo/MyApp if your
347 application was installed at /foo/MyApp.pm)
351 use Catalyst '-Log=warn,fatal,error';
353 Specifies a comma-delimited list of log levels.
357 Enables statistics collection and reporting.
359 use Catalyst qw/-Stats=1/;
361 You can also force this setting from the system environment with CATALYST_STATS
362 or <MYAPP>_STATS. The environment settings override the application, with
363 <MYAPP>_STATS having the highest priority.
365 Stats are also enabled if L<< debugging |/"-Debug" >> is enabled.
369 =head2 INFORMATION ABOUT THE CURRENT REQUEST
373 Returns a L<Catalyst::Action> object for the current action, which
374 stringifies to the action name. See L<Catalyst::Action>.
378 Returns the namespace of the current action, i.e., the URI prefix
379 corresponding to the controller of the current action. For example:
381 # in Controller::Foo::Bar
382 $c->namespace; # returns 'foo/bar';
388 Returns the current L<Catalyst::Request> object, giving access to
389 information about the current client request (including parameters,
390 cookies, HTTP headers, etc.). See L<Catalyst::Request>.
392 =head2 REQUEST FLOW HANDLING
394 =head2 $c->forward( $action [, \@arguments ] )
396 =head2 $c->forward( $class, $method, [, \@arguments ] )
398 This is one way of calling another action (method) in the same or
399 a different controller. You can also use C<< $self->my_method($c, @args) >>
400 in the same controller or C<< $c->controller('MyController')->my_method($c, @args) >>
401 in a different controller.
402 The main difference is that 'forward' uses some of the Catalyst request
403 cycle overhead, including debugging, which may be useful to you. On the
404 other hand, there are some complications to using 'forward', restrictions
405 on values returned from 'forward', and it may not handle errors as you prefer.
406 Whether you use 'forward' or not is up to you; it is not considered superior to
407 the other ways to call a method.
409 'forward' calls another action, by its private name. If you give a
410 class name but no method, C<process()> is called. You may also optionally
411 pass arguments in an arrayref. The action will receive the arguments in
412 C<@_> and C<< $c->req->args >>. Upon returning from the function,
413 C<< $c->req->args >> will be restored to the previous values.
415 Any data C<return>ed from the action forwarded to, will be returned by the
418 my $foodata = $c->forward('/foo');
419 $c->forward('index');
420 $c->forward(qw/Model::DBIC::Foo do_stuff/);
421 $c->forward('View::TT');
423 Note that L<< forward|/"$c->forward( $action [, \@arguments ] )" >> implies
424 an C<< eval { } >> around the call (actually
425 L<< execute|/"$c->execute( $class, $coderef )" >> does), thus rendering all
426 exceptions thrown by the called action non-fatal and pushing them onto
427 $c->error instead. If you want C<die> to propagate you need to do something
431 die join "\n", @{ $c->error } if @{ $c->error };
433 Or make sure to always return true values from your actions and write
436 $c->forward('foo') || return;
438 Another note is that C<< $c->forward >> always returns a scalar because it
439 actually returns $c->state which operates in a scalar context.
440 Thus, something like:
444 in an action that is forwarded to is going to return a scalar,
445 i.e. how many items are in that array, which is probably not what you want.
446 If you need to return an array then return a reference to it,
449 $c->stash->{array} = \@array;
451 and access it from the stash.
453 Keep in mind that the C<end> method used is that of the caller action. So a C<$c-E<gt>detach> inside a forwarded action would run the C<end> method from the original action requested.
457 sub forward { my $c = shift; no warnings 'recursion'; $c->dispatcher->forward( $c, @_ ) }
459 =head2 $c->detach( $action [, \@arguments ] )
461 =head2 $c->detach( $class, $method, [, \@arguments ] )
465 The same as L<< forward|/"$c->forward( $action [, \@arguments ] )" >>, but
466 doesn't return to the previous action when processing is finished.
468 When called with no arguments it escapes the processing chain entirely.
472 sub detach { my $c = shift; $c->dispatcher->detach( $c, @_ ) }
474 =head2 $c->visit( $action [, \@arguments ] )
476 =head2 $c->visit( $action [, \@captures, \@arguments ] )
478 =head2 $c->visit( $class, $method, [, \@arguments ] )
480 =head2 $c->visit( $class, $method, [, \@captures, \@arguments ] )
482 Almost the same as L<< forward|/"$c->forward( $action [, \@arguments ] )" >>,
483 but does a full dispatch, instead of just calling the new C<$action> /
484 C<< $class->$method >>. This means that C<begin>, C<auto> and the method
485 you go to are called, just like a new request.
487 In addition both C<< $c->action >> and C<< $c->namespace >> are localized.
488 This means, for example, that C<< $c->action >> methods such as
489 L<name|Catalyst::Action/name>, L<class|Catalyst::Action/class> and
490 L<reverse|Catalyst::Action/reverse> return information for the visited action
491 when they are invoked within the visited action. This is different from the
492 behavior of L<< forward|/"$c->forward( $action [, \@arguments ] )" >>, which
493 continues to use the $c->action object from the caller action even when
494 invoked from the called action.
496 C<< $c->stash >> is kept unchanged.
498 In effect, L<< visit|/"$c->visit( $action [, \@captures, \@arguments ] )" >>
499 allows you to "wrap" another action, just as it would have been called by
500 dispatching from a URL, while the analogous
501 L<< go|/"$c->go( $action [, \@captures, \@arguments ] )" >> allows you to
502 transfer control to another action as if it had been reached directly from a URL.
506 sub visit { my $c = shift; $c->dispatcher->visit( $c, @_ ) }
508 =head2 $c->go( $action [, \@arguments ] )
510 =head2 $c->go( $action [, \@captures, \@arguments ] )
512 =head2 $c->go( $class, $method, [, \@arguments ] )
514 =head2 $c->go( $class, $method, [, \@captures, \@arguments ] )
516 The relationship between C<go> and
517 L<< visit|/"$c->visit( $action [, \@captures, \@arguments ] )" >> is the same as
518 the relationship between
519 L<< forward|/"$c->forward( $class, $method, [, \@arguments ] )" >> and
520 L<< detach|/"$c->detach( $action [, \@arguments ] )" >>. Like C<< $c->visit >>,
521 C<< $c->go >> will perform a full dispatch on the specified action or method,
522 with localized C<< $c->action >> and C<< $c->namespace >>. Like C<detach>,
523 C<go> escapes the processing of the current request chain on completion, and
524 does not return to its caller.
526 @arguments are arguments to the final destination of $action. @captures are
527 arguments to the intermediate steps, if any, on the way to the final sub of
532 sub go { my $c = shift; $c->dispatcher->go( $c, @_ ) }
538 Returns the current L<Catalyst::Response> object, see there for details.
542 Returns a hashref to the stash, which may be used to store data and pass
543 it between components during a request. You can also set hash keys by
544 passing arguments. The stash is automatically sent to the view. The
545 stash is cleared at the end of a request; it cannot be used for
546 persistent storage (for this you must use a session; see
547 L<Catalyst::Plugin::Session> for a complete system integrated with
550 $c->stash->{foo} = $bar;
551 $c->stash( { moose => 'majestic', qux => 0 } );
552 $c->stash( bar => 1, gorch => 2 ); # equivalent to passing a hashref
554 # stash is automatically passed to the view for use in a template
555 $c->forward( 'MyApp::View::TT' );
557 The stash hash is currently stored in the PSGI C<$env> and is managed by
558 L<Catalyst::Middleware::Stash>. Since it's part of the C<$env> items in
559 the stash can be accessed in sub applications mounted under your main
560 L<Catalyst> application. For example if you delegate the response of an
561 action to another L<Catalyst> application, that sub application will have
562 access to all the stash keys of the main one, and if can of course add
563 more keys of its own. However those new keys will not 'bubble' back up
564 to the main application.
566 For more information the best thing to do is to review the test case:
567 t/middleware-stash.t in the distribution /t directory.
573 $c->log->error("You are requesting the stash but you don't have a context") unless blessed $c;
574 return Catalyst::Middleware::Stash::get_stash($c->req->env)->(@_);
579 =head2 $c->error($error, ...)
581 =head2 $c->error($arrayref)
583 Returns an arrayref containing error messages. If Catalyst encounters an
584 error while processing a request, it stores the error in $c->error. This
585 method should only be used to store fatal error messages.
587 my @error = @{ $c->error };
591 $c->error('Something bad happened');
593 Calling this will always return an arrayref (if there are no errors it
594 will be an empty arrayref.
601 my $error = ref $_[0] eq 'ARRAY' ? $_[0] : [@_];
602 croak @$error unless ref $c;
603 push @{ $c->{error} }, @$error;
605 elsif ( defined $_[0] ) { $c->{error} = undef }
606 return $c->{error} || [];
612 Contains the return value of the last executed action.
613 Note that << $c->state >> operates in a scalar context which means that all
614 values it returns are scalar.
616 =head2 $c->clear_errors
618 Clear errors. You probably don't want to clear the errors unless you are
619 implementing a custom error screen.
621 This is equivalent to running
632 =head2 $c->has_errors
634 Returns true if you have errors
638 sub has_errors { scalar(@{shift->error}) ? 1:0 }
640 =head2 $c->last_error
642 Returns the most recent error in the stack (the one most recently added...)
643 or nothing if there are no errors. This does not modify the contents of the
649 my (@errs) = @{shift->error};
650 return scalar(@errs) ? $errs[-1]: undef;
655 shifts the most recently added error off the error stack and returns it. Returns
656 nothing if there are no more errors.
662 my @errors = @{$self->error};
663 my $err = shift(@errors);
664 $self->{error} = \@errors;
670 pops the most recently added error off the error stack and returns it. Returns
671 nothing if there are no more errors.
677 my @errors = @{$self->error};
678 my $err = pop(@errors);
679 $self->{error} = \@errors;
683 sub _comp_search_prefixes {
685 return map $c->components->{ $_ }, $c->_comp_names_search_prefixes(@_);
688 # search components given a name and some prefixes
689 sub _comp_names_search_prefixes {
690 my ( $c, $name, @prefixes ) = @_;
691 my $appclass = ref $c || $c;
692 my $filter = "^${appclass}::(" . join( '|', @prefixes ) . ')::';
693 $filter = qr/$filter/; # Compile regex now rather than once per loop
695 # map the original component name to the sub part that we will search against
696 my %eligible = map { my $n = $_; $n =~ s{^$appclass\::[^:]+::}{}; $_ => $n; }
697 grep { /$filter/ } keys %{ $c->components };
699 # undef for a name will return all
700 return keys %eligible if !defined $name;
702 my $query = $name->$_isa('Regexp') ? $name : qr/^$name$/i;
703 my @result = grep { $eligible{$_} =~ m{$query} } keys %eligible;
705 return @result if @result;
707 # if we were given a regexp to search against, we're done.
708 return if $name->$_isa('Regexp');
710 # skip regexp fallback if configured
712 if $appclass->config->{disable_component_resolution_regex_fallback};
716 @result = grep { $eligible{ $_ } =~ m{$query} } keys %eligible;
718 # no results? try against full names
720 @result = grep { m{$query} } keys %eligible;
723 # don't warn if we didn't find any results, it just might not exist
725 # Disgusting hack to work out correct method name
726 my $warn_for = lc $prefixes[0];
727 my $msg = "Used regexp fallback for \$c->${warn_for}('${name}'), which found '" .
728 (join '", "', @result) . "'. Relying on regexp fallback behavior for " .
729 "component resolution is unreliable and unsafe.";
730 my $short = $result[0];
731 # remove the component namespace prefix
732 $short =~ s/.*?(Model|Controller|View):://;
733 my $shortmess = Carp::shortmess('');
734 if ($shortmess =~ m#Catalyst/Plugin#) {
735 $msg .= " You probably need to set '$short' instead of '${name}' in this " .
737 } elsif ($shortmess =~ m#Catalyst/lib/(View|Controller)#) {
738 $msg .= " You probably need to set '$short' instead of '${name}' in this " .
739 "component's config";
741 $msg .= " You probably meant \$c->${warn_for}('$short') instead of \$c->${warn_for}('${name}'), " .
742 "but if you really wanted to search, pass in a regexp as the argument " .
743 "like so: \$c->${warn_for}(qr/${name}/)";
745 $c->log->warn( "${msg}$shortmess" );
751 # Find possible names for a prefix
753 my ( $c, @prefixes ) = @_;
754 my $appclass = ref $c || $c;
756 my $filter = "^${appclass}::(" . join( '|', @prefixes ) . ')::';
758 my @names = map { s{$filter}{}; $_; }
759 $c->_comp_names_search_prefixes( undef, @prefixes );
764 # Filter a component before returning by calling ACCEPT_CONTEXT if available
766 sub _filter_component {
767 my ( $c, $comp, @args ) = @_;
769 if(ref $comp eq 'CODE') {
773 if ( eval { $comp->can('ACCEPT_CONTEXT'); } ) {
774 return $comp->ACCEPT_CONTEXT( $c, @args );
777 $c->log->warn("You called component '${\$comp->catalyst_component_name}' with arguments [@args], but this component does not ACCEPT_CONTEXT, so args are ignored.") if scalar(@args) && $c->debug;
782 =head2 COMPONENT ACCESSORS
784 =head2 $c->controller($name)
786 Gets a L<Catalyst::Controller> instance by name.
788 $c->controller('Foo')->do_stuff;
790 If the name is omitted, will return the controller for the dispatched
793 If you want to search for controllers, pass in a regexp as the argument.
795 # find all controllers that start with Foo
796 my @foo_controllers = $c->controller(qr{^Foo});
802 my ( $c, $name, @args ) = @_;
804 my $appclass = ref($c) || $c;
806 unless ( $name->$_isa('Regexp') ) { # Direct component hash lookup to avoid costly regexps
807 my $comps = $c->components;
808 my $check = $appclass."::Controller::".$name;
809 return $c->_filter_component( $comps->{$check}, @args ) if exists $comps->{$check};
811 my @result = $c->_comp_search_prefixes( $name, qw/Controller C/ );
812 return map { $c->_filter_component( $_, @args ) } @result if ref $name;
813 return $c->_filter_component( $result[ 0 ], @args );
816 return $c->component( $c->action->class );
819 =head2 $c->model($name)
821 Gets a L<Catalyst::Model> instance by name.
823 $c->model('Foo')->do_stuff;
825 Any extra arguments are directly passed to ACCEPT_CONTEXT, if the model
826 defines ACCEPT_CONTEXT. If it does not, the args are discarded.
828 If the name is omitted, it will look for
829 - a model object in $c->stash->{current_model_instance}, then
830 - a model name in $c->stash->{current_model}, then
831 - a config setting 'default_model', or
832 - check if there is only one model, and return it if that's the case.
834 If you want to search for models, pass in a regexp as the argument.
836 # find all models that start with Foo
837 my @foo_models = $c->model(qr{^Foo});
842 my ( $c, $name, @args ) = @_;
843 my $appclass = ref($c) || $c;
845 unless ( $name->$_isa('Regexp') ) { # Direct component hash lookup to avoid costly regexps
846 my $comps = $c->components;
847 my $check = $appclass."::Model::".$name;
848 return $c->_filter_component( $comps->{$check}, @args ) if exists $comps->{$check};
850 my @result = $c->_comp_search_prefixes( $name, qw/Model M/ );
851 return map { $c->_filter_component( $_, @args ) } @result if ref $name;
852 return $c->_filter_component( $result[ 0 ], @args );
856 return $c->stash->{current_model_instance}
857 if $c->stash->{current_model_instance};
858 return $c->model( $c->stash->{current_model} )
859 if $c->stash->{current_model};
861 return $c->model( $appclass->config->{default_model} )
862 if $appclass->config->{default_model};
864 my( $comp, $rest ) = $c->_comp_search_prefixes( undef, qw/Model M/);
867 $c->log->warn( Carp::shortmess('Calling $c->model() will return a random model unless you specify one of:') );
868 $c->log->warn( '* $c->config(default_model => "the name of the default model to use")' );
869 $c->log->warn( '* $c->stash->{current_model} # the name of the model to use for this request' );
870 $c->log->warn( '* $c->stash->{current_model_instance} # the instance of the model to use for this request' );
871 $c->log->warn( 'NB: in version 5.81, the "random" behavior will not work at all.' );
874 return $c->_filter_component( $comp );
878 =head2 $c->view($name)
880 Gets a L<Catalyst::View> instance by name.
882 $c->view('Foo')->do_stuff;
884 Any extra arguments are directly passed to ACCEPT_CONTEXT.
886 If the name is omitted, it will look for
887 - a view object in $c->stash->{current_view_instance}, then
888 - a view name in $c->stash->{current_view}, then
889 - a config setting 'default_view', or
890 - check if there is only one view, and return it if that's the case.
892 If you want to search for views, pass in a regexp as the argument.
894 # find all views that start with Foo
895 my @foo_views = $c->view(qr{^Foo});
900 my ( $c, $name, @args ) = @_;
902 my $appclass = ref($c) || $c;
904 unless ( $name->$_isa('Regexp') ) { # Direct component hash lookup to avoid costly regexps
905 my $comps = $c->components;
906 my $check = $appclass."::View::".$name;
907 if( exists $comps->{$check} ) {
908 return $c->_filter_component( $comps->{$check}, @args );
911 $c->log->warn( "Attempted to use view '$check', but does not exist" );
914 my @result = $c->_comp_search_prefixes( $name, qw/View V/ );
915 return map { $c->_filter_component( $_, @args ) } @result if ref $name;
916 return $c->_filter_component( $result[ 0 ], @args );
920 return $c->stash->{current_view_instance}
921 if $c->stash->{current_view_instance};
922 return $c->view( $c->stash->{current_view} )
923 if $c->stash->{current_view};
925 return $c->view( $appclass->config->{default_view} )
926 if $appclass->config->{default_view};
928 my( $comp, $rest ) = $c->_comp_search_prefixes( undef, qw/View V/);
931 $c->log->warn( 'Calling $c->view() will return a random view unless you specify one of:' );
932 $c->log->warn( '* $c->config(default_view => "the name of the default view to use")' );
933 $c->log->warn( '* $c->stash->{current_view} # the name of the view to use for this request' );
934 $c->log->warn( '* $c->stash->{current_view_instance} # the instance of the view to use for this request' );
935 $c->log->warn( 'NB: in version 5.81, the "random" behavior will not work at all.' );
938 return $c->_filter_component( $comp );
941 =head2 $c->controllers
943 Returns the available names which can be passed to $c->controller
949 return $c->_comp_names(qw/Controller C/);
954 Returns the available names which can be passed to $c->model
960 return $c->_comp_names(qw/Model M/);
966 Returns the available names which can be passed to $c->view
972 return $c->_comp_names(qw/View V/);
975 =head2 $c->comp($name)
977 =head2 $c->component($name)
979 Gets a component object by name. This method is not recommended,
980 unless you want to get a specific component by full
981 class. C<< $c->controller >>, C<< $c->model >>, and C<< $c->view >>
982 should be used instead.
984 If C<$name> is a regexp, a list of components matched against the full
985 component name will be returned.
987 If Catalyst can't find a component by name, it will fallback to regex
988 matching by default. To disable this behaviour set
989 disable_component_resolution_regex_fallback to a true value.
991 __PACKAGE__->config( disable_component_resolution_regex_fallback => 1 );
996 my ( $c, $name, @args ) = @_;
999 my $comps = $c->components;
1002 # is it the exact name?
1003 return $c->_filter_component( $comps->{ $name }, @args )
1004 if exists $comps->{ $name };
1006 # perhaps we just omitted "MyApp"?
1007 my $composed = ( ref $c || $c ) . "::${name}";
1008 return $c->_filter_component( $comps->{ $composed }, @args )
1009 if exists $comps->{ $composed };
1011 # search all of the models, views and controllers
1012 my( $comp ) = $c->_comp_search_prefixes( $name, qw/Model M Controller C View V/ );
1013 return $c->_filter_component( $comp, @args ) if $comp;
1017 if $c->config->{disable_component_resolution_regex_fallback};
1019 # This is here so $c->comp( '::M::' ) works
1020 my $query = ref $name ? $name : qr{$name}i;
1022 my @result = grep { m{$query} } keys %{ $c->components };
1023 return map { $c->_filter_component( $_, @args ) } @result if ref $name;
1025 if( $result[ 0 ] ) {
1026 $c->log->warn( Carp::shortmess(qq(Found results for "${name}" using regexp fallback)) );
1027 $c->log->warn( 'Relying on the regexp fallback behavior for component resolution' );
1028 $c->log->warn( 'is unreliable and unsafe. You have been warned' );
1029 return $c->_filter_component( $result[ 0 ], @args );
1032 # I would expect to return an empty list here, but that breaks back-compat
1036 return sort keys %{ $c->components };
1039 =head2 CLASS DATA AND HELPER CLASSES
1043 Returns or takes a hashref containing the application's configuration.
1045 __PACKAGE__->config( { db => 'dsn:SQLite:foo.db' } );
1047 You can also use a C<YAML>, C<XML> or L<Config::General> config file
1048 like C<myapp.conf> in your applications home directory. See
1049 L<Catalyst::Plugin::ConfigLoader>.
1051 =head3 Cascading configuration
1053 The config method is present on all Catalyst components, and configuration
1054 will be merged when an application is started. Configuration loaded with
1055 L<Catalyst::Plugin::ConfigLoader> takes precedence over other configuration,
1056 followed by configuration in your top level C<MyApp> class. These two
1057 configurations are merged, and then configuration data whose hash key matches a
1058 component name is merged with configuration for that component.
1060 The configuration for a component is then passed to the C<new> method when a
1061 component is constructed.
1065 MyApp->config({ 'Model::Foo' => { bar => 'baz', overrides => 'me' } });
1066 MyApp::Model::Foo->config({ quux => 'frob', overrides => 'this' });
1068 will mean that C<MyApp::Model::Foo> receives the following data when
1071 MyApp::Model::Foo->new({
1077 It's common practice to use a Moose attribute
1078 on the receiving component to access the config value.
1080 package MyApp::Model::Foo;
1084 # this attr will receive 'baz' at construction time
1090 You can then get the value 'baz' by calling $c->model('Foo')->bar
1091 (or $self->bar inside code in the model).
1093 B<NOTE:> you MUST NOT call C<< $self->config >> or C<< __PACKAGE__->config >>
1094 as a way of reading config within your code, as this B<will not> give you the
1095 correctly merged config back. You B<MUST> take the config values supplied to
1096 the constructor and use those instead.
1100 around config => sub {
1104 croak('Setting config after setup has been run is not allowed.')
1105 if ( @_ and $c->setup_finished );
1112 Returns the logging object instance. Unless it is already set, Catalyst
1113 sets this up with a L<Catalyst::Log> object. To use your own log class,
1114 set the logger with the C<< __PACKAGE__->log >> method prior to calling
1115 C<< __PACKAGE__->setup >>.
1117 __PACKAGE__->log( MyLogger->new );
1122 $c->log->info( 'Now logging with my own logger!' );
1124 Your log class should implement the methods described in
1129 Returned True if there's a valid encoding
1131 =head2 clear_encoding
1133 Clears the encoding for the current context
1137 Sets or gets the application encoding. Setting encoding takes either an
1138 Encoding object or a string that we try to resolve via L<Encode::find_encoding>.
1140 You would expect to get the encoding object back if you attempt to set it. If
1141 there is a failure you will get undef returned and an error message in the log.
1145 sub has_encoding { shift->encoding ? 1:0 }
1147 sub clear_encoding {
1150 $c->encoding(undef);
1152 $c->log->error("You can't clear encoding on the application");
1162 # Don't let one change this once we are too far into the response
1163 if(blessed $c && $c->res->finalized_headers) {
1164 Carp::croak("You may not change the encoding once the headers are finalized");
1168 # Let it be set to undef
1169 if (my $wanted = shift) {
1170 $encoding = Encode::find_encoding($wanted)
1171 or Carp::croak( qq/Unknown encoding '$wanted'/ );
1172 binmode(STDERR, ':encoding(' . $encoding->name . ')');
1179 ? $c->{encoding} = $encoding
1180 : $c->_encoding($encoding);
1182 $encoding = ref $c && exists $c->{encoding}
1192 Returns 1 if debug mode is enabled, 0 otherwise.
1194 You can enable debug mode in several ways:
1198 =item By calling myapp_server.pl with the -d flag
1200 =item With the environment variables MYAPP_DEBUG, or CATALYST_DEBUG
1202 =item The -Debug option in your MyApp.pm
1204 =item By declaring C<sub debug { 1 }> in your MyApp.pm.
1208 The first three also set the log level to 'debug'.
1210 Calling C<< $c->debug(1) >> has no effect.
1216 =head2 $c->dispatcher
1218 Returns the dispatcher instance. See L<Catalyst::Dispatcher>.
1222 Returns the engine instance. See L<Catalyst::Engine>.
1225 =head2 UTILITY METHODS
1227 =head2 $c->path_to(@path)
1229 Merges C<@path> with C<< $c->config->{home} >> and returns a
1230 L<Path::Class::Dir> object. Note you can usually use this object as
1231 a filename, but sometimes you will have to explicitly stringify it
1232 yourself by calling the C<< ->stringify >> method.
1236 $c->path_to( 'db', 'sqlite.db' );
1241 my ( $c, @path ) = @_;
1242 my $path = Path::Class::Dir->new( $c->config->{home}, @path );
1243 if ( -d $path ) { return $path }
1244 else { return Path::Class::File->new( $c->config->{home}, @path ) }
1248 my ( $class, $name, $plugin, @args ) = @_;
1250 # See block comment in t/unit_core_plugin.t
1251 $class->log->warn(qq/Adding plugin using the ->plugin method is deprecated, and will be removed in a future release/);
1253 $class->_register_plugin( $plugin, 1 );
1255 eval { $plugin->import };
1256 $class->mk_classdata($name);
1258 eval { $obj = $plugin->new(@args) };
1261 Catalyst::Exception->throw( message =>
1262 qq/Couldn't instantiate instant plugin "$plugin", "$@"/ );
1265 $class->$name($obj);
1266 $class->log->debug(qq/Initialized instant plugin "$plugin" as "$name"/)
1272 Initializes the dispatcher and engine, loads any plugins, and loads the
1273 model, view, and controller components. You may also specify an array
1274 of plugins to load here, if you choose to not load them in the C<use
1278 MyApp->setup( qw/-Debug/ );
1280 B<Note:> You B<should not> wrap this method with method modifiers
1281 or bad things will happen - wrap the C<setup_finalize> method instead.
1283 B<Note:> You can create a custom setup stage that will execute when the
1284 application is starting. Use this to customize setup.
1286 MyApp->setup(-Custom=value);
1289 my ($class, $value) = @_;
1292 Can be handy if you want to hook into the setup phase.
1297 my ( $class, @arguments ) = @_;
1298 croak('Running setup more than once')
1299 if ( $class->setup_finished );
1301 unless ( $class->isa('Catalyst') ) {
1303 Catalyst::Exception->throw(
1304 message => qq/'$class' does not inherit from Catalyst/ );
1307 if ( $class->arguments ) {
1308 @arguments = ( @arguments, @{ $class->arguments } );
1314 foreach (@arguments) {
1318 ( $flags->{log} ) ? 'debug,' . $flags->{log} : 'debug';
1320 elsif (/^-(\w+)=?(.*)$/) {
1321 $flags->{ lc $1 } = $2;
1324 push @{ $flags->{plugins} }, $_;
1328 $class->setup_home( delete $flags->{home} );
1330 $class->setup_log( delete $flags->{log} );
1331 $class->setup_plugins( delete $flags->{plugins} );
1333 $class->setup_data_handlers();
1334 $class->setup_dispatcher( delete $flags->{dispatcher} );
1335 if (my $engine = delete $flags->{engine}) {
1336 $class->log->warn("Specifying the engine in ->setup is no longer supported, see Catalyst::Upgrading");
1338 $class->setup_engine();
1339 $class->setup_stats( delete $flags->{stats} );
1341 for my $flag ( sort keys %{$flags} ) {
1343 if ( my $code = $class->can( 'setup_' . $flag ) ) {
1344 &$code( $class, delete $flags->{$flag} );
1347 $class->log->warn(qq/Unknown flag "$flag"/);
1351 eval { require Catalyst::Devel; };
1352 if( !$@ && $ENV{CATALYST_SCRIPT_GEN} && ( $ENV{CATALYST_SCRIPT_GEN} < $Catalyst::Devel::CATALYST_SCRIPT_GEN ) ) {
1353 $class->log->warn(<<"EOF");
1354 You are running an old script!
1356 Please update by running (this will overwrite existing files):
1357 catalyst.pl -force -scripts $class
1359 or (this will not overwrite existing files):
1360 catalyst.pl -scripts $class
1365 # Call plugins setup, this is stupid and evil.
1366 # Also screws C3 badly on 5.10, hack to avoid.
1368 no warnings qw/redefine/;
1369 local *setup = sub { };
1370 $class->setup unless $Catalyst::__AM_RESTARTING;
1373 # If you are expecting configuration info as part of your setup, it needs
1374 # to get called here and below, since we need the above line to support
1375 # ConfigLoader based configs.
1377 $class->setup_encoding();
1378 $class->setup_middleware();
1380 # Initialize our data structure
1381 $class->components( {} );
1383 $class->setup_components;
1385 if ( $class->debug ) {
1386 my @plugins = map { "$_ " . ( $_->VERSION || '' ) } $class->registered_plugins;
1389 my $column_width = Catalyst::Utils::term_width() - 6;
1390 my $t = Text::SimpleTable->new($column_width);
1391 $t->row($_) for @plugins;
1392 $class->log->debug( "Loaded plugins:\n" . $t->draw . "\n" );
1395 my @middleware = map {
1398 (ref($_) .' '. ($_->can('VERSION') ? $_->VERSION || '' : '')
1399 || '') } $class->registered_middlewares;
1402 my $column_width = Catalyst::Utils::term_width() - 6;
1403 my $t = Text::SimpleTable->new($column_width);
1404 $t->row($_) for @middleware;
1405 $class->log->debug( "Loaded PSGI Middleware:\n" . $t->draw . "\n" );
1408 my %dh = $class->registered_data_handlers;
1409 if (my @data_handlers = keys %dh) {
1410 my $column_width = Catalyst::Utils::term_width() - 6;
1411 my $t = Text::SimpleTable->new($column_width);
1412 $t->row($_) for @data_handlers;
1413 $class->log->debug( "Loaded Request Data Handlers:\n" . $t->draw . "\n" );
1416 my $dispatcher = $class->dispatcher;
1417 my $engine = $class->engine;
1418 my $home = $class->config->{home};
1420 $class->log->debug(sprintf(q/Loaded dispatcher "%s"/, blessed($dispatcher)));
1421 $class->log->debug(sprintf(q/Loaded engine "%s"/, blessed($engine)));
1425 ? $class->log->debug(qq/Found home "$home"/)
1426 : $class->log->debug(qq/Home "$home" doesn't exist/)
1427 : $class->log->debug(q/Couldn't find home/);
1429 my $column_width = Catalyst::Utils::term_width() - 8 - 9;
1431 my $t = Text::SimpleTable->new( [ $column_width, 'Class' ], [ 8, 'Type' ] );
1432 for my $comp ( sort keys %{ $class->components } ) {
1433 my $type = ref $class->components->{$comp} ? 'instance' : 'class';
1434 $t->row( $comp, $type );
1436 $class->log->debug( "Loaded components:\n" . $t->draw . "\n" )
1437 if ( keys %{ $class->components } );
1440 # Add our self to components, since we are also a component
1441 if( $class->isa('Catalyst::Controller') ){
1442 $class->components->{$class} = $class;
1445 $class->setup_actions;
1447 if ( $class->debug ) {
1448 my $name = $class->config->{name} || 'Application';
1449 $class->log->info("$name powered by Catalyst $Catalyst::VERSION");
1452 if ($class->config->{case_sensitive}) {
1453 $class->log->warn($class . "->config->{case_sensitive} is set.");
1454 $class->log->warn("This setting is deprecated and planned to be removed in Catalyst 5.81.");
1457 $class->setup_finalize;
1459 # Flush the log for good measure (in case something turned off 'autoflush' early)
1460 $class->log->_flush() if $class->log->can('_flush');
1462 return $class || 1; # Just in case someone named their Application 0...
1465 =head2 $app->setup_finalize
1467 A hook to attach modifiers to. This method does not do anything except set the
1468 C<setup_finished> accessor.
1470 Applying method modifiers to the C<setup> method doesn't work, because of quirky things done for plugin setup.
1474 after setup_finalize => sub {
1482 sub setup_finalize {
1484 $class->setup_finished(1);
1487 =head2 $c->uri_for( $path?, @args?, \%query_values? )
1489 =head2 $c->uri_for( $action, \@captures?, @args?, \%query_values? )
1491 =head2 $c->uri_for( $action, [@captures, @args], \%query_values? )
1493 Constructs an absolute L<URI> object based on the application root, the
1494 provided path, and the additional arguments and query parameters provided.
1495 When used as a string, provides a textual URI. If you need more flexibility
1496 than this (i.e. the option to provide relative URIs etc.) see
1497 L<Catalyst::Plugin::SmartURI>.
1499 If no arguments are provided, the URI for the current action is returned.
1500 To return the current action and also provide @args, use
1501 C<< $c->uri_for( $c->action, @args ) >>.
1503 If the first argument is a string, it is taken as a public URI path relative
1504 to C<< $c->namespace >> (if it doesn't begin with a forward slash) or
1505 relative to the application root (if it does). It is then merged with
1506 C<< $c->request->base >>; any C<@args> are appended as additional path
1507 components; and any C<%query_values> are appended as C<?foo=bar> parameters.
1509 If the first argument is a L<Catalyst::Action> it represents an action which
1510 will have its path resolved using C<< $c->dispatcher->uri_for_action >>. The
1511 optional C<\@captures> argument (an arrayref) allows passing the captured
1512 variables that are needed to fill in the paths of Chained and Regex actions;
1513 once the path is resolved, C<uri_for> continues as though a path was
1514 provided, appending any arguments or parameters and creating an absolute
1517 The captures for the current request can be found in
1518 C<< $c->request->captures >>, and actions can be resolved using
1519 C<< Catalyst::Controller->action_for($name) >>. If you have a private action
1520 path, use C<< $c->uri_for_action >> instead.
1522 # Equivalent to $c->req->uri
1523 $c->uri_for($c->action, $c->req->captures,
1524 @{ $c->req->args }, $c->req->params);
1526 # For the Foo action in the Bar controller
1527 $c->uri_for($c->controller('Bar')->action_for('Foo'));
1529 # Path to a static resource
1530 $c->uri_for('/static/images/logo.png');
1532 In general the scheme of the generated URI object will follow the incoming request
1533 however if your targeted action or action chain has the Scheme attribute it will
1536 Also, if the targeted Action or Action chain declares Args/CaptureArgs that have
1537 type constraints, we will require that your proposed URL verify on those declared
1543 my ( $c, $path, @args ) = @_;
1545 if ( $path->$_isa('Catalyst::Controller') ) {
1546 $path = $path->path_prefix;
1551 undef($path) if (defined $path && $path eq '');
1554 ( scalar @args && ref $args[$#args] eq 'HASH' ? pop @args : {} );
1556 carp "uri_for called with undef argument" if grep { ! defined $_ } @args;
1558 my $target_action = $path->$_isa('Catalyst::Action') ? $path : undef;
1559 if ( $path->$_isa('Catalyst::Action') ) { # action object
1560 s|/|%2F|g for @args;
1561 my $captures = [ map { s|/|%2F|g; $_; }
1562 ( scalar @args && ref $args[0] eq 'ARRAY'
1567 my $expanded_action = $c->dispatcher->expand_action( $action );
1568 my $num_captures = $expanded_action->number_of_captures;
1570 # ->uri_for( $action, \@captures_and_args, \%query_values? )
1571 if( !@args && $action->number_of_args ) {
1572 unshift @args, splice @$captures, $num_captures;
1576 unless($expanded_action->match_captures_constraints($c, $captures)) {
1577 carp "captures [@{$captures}] do not match the type constraints in actionchain ending with '$expanded_action'";
1582 $path = $c->dispatcher->uri_for_action($action, $captures);
1583 if (not defined $path) {
1584 $c->log->debug(qq/Can't find uri_for action '$action' @$captures/)
1588 $path = '/' if $path eq '';
1590 # At this point @encoded_args is the remaining Args (all captures removed).
1591 if($expanded_action->has_args_constraints) {
1592 unless($expanded_action->match_args($c,\@args)) {
1593 carp "args [@args] do not match the type constraints in action '$expanded_action'";
1599 unshift(@args, $path);
1601 unless (defined $path && $path =~ s!^/!!) { # in-place strip
1602 my $namespace = $c->namespace;
1603 if (defined $path) { # cheesy hack to handle path '../foo'
1604 $namespace =~ s{(?:^|/)[^/]+$}{} while $args[0] =~ s{^\.\./}{};
1606 unshift(@args, $namespace || '');
1609 # join args with '/', or a blank string
1610 my $args = join('/', grep { defined($_) } @args);
1611 $args =~ s/\?/%3F/g; # STUPID STUPID SPECIAL CASE
1614 my ($base, $class) = ('/', 'URI::_generic');
1616 $base = $c->req->base;
1617 if($target_action) {
1618 $target_action = $c->dispatcher->expand_action($target_action);
1619 if(my $s = $target_action->scheme) {
1624 $class = ref($base);
1627 $class = ref($base);
1630 $base =~ s{(?<!/)$}{/};
1635 # remove and save fragment if there is one
1637 if ($args =~ s/#(.+)$//) {
1638 $fragment = encode_utf8($1);
1639 $fragment =~ s/([^A-Za-z0-9\-_.!~*'() ])/$URI::Escape::escapes{$1}/go;
1640 $fragment =~ s/ /+/g;
1643 if (my @keys = keys %$params) {
1644 # somewhat lifted from URI::_query's query_form
1645 $query = '?'.join('&', map {
1646 my $val = $params->{$_};
1647 #s/([;\/?:@&=+,\$\[\]%])/$URI::Escape::escapes{$1}/go; ## Commented out because seems to lead to double encoding - JNAP
1650 $val = '' unless defined $val;
1653 $param = encode_utf8($param);
1654 # using the URI::Escape pattern here so utf8 chars survive
1655 $param =~ s/([^A-Za-z0-9\-_.!~*'() ])/$URI::Escape::escapes{$1}/go;
1658 $key = encode_utf8($key);
1659 # using the URI::Escape pattern here so utf8 chars survive
1660 $key =~ s/([^A-Za-z0-9\-_.!~*'() ])/$URI::Escape::escapes{$1}/go;
1663 "${key}=$param"; } ( ref $val eq 'ARRAY' ? @$val : $val ));
1667 $base = encode_utf8 $base;
1668 $base =~ s/([^$URI::uric])/$URI::Escape::escapes{$1}/go;
1669 $args = encode_utf8 $args;
1670 $args =~ s/([^$URI::uric])/$URI::Escape::escapes{$1}/go;
1672 # re-attach fragment on the end of everything after adding params
1673 $query .= "#$fragment" if $fragment;
1675 my $res = bless(\"${base}${args}${query}", $class);
1679 =head2 $c->uri_for_action( $path, \@captures_and_args?, @args?, \%query_values? )
1681 =head2 $c->uri_for_action( $action, \@captures_and_args?, @args?, \%query_values? )
1687 A private path to the Catalyst action you want to create a URI for.
1689 This is a shortcut for calling C<< $c->dispatcher->get_action_by_path($path)
1690 >> and passing the resulting C<$action> and the remaining arguments to C<<
1693 You can also pass in a Catalyst::Action object, in which case it is passed to
1696 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.
1698 For example, if the action looks like:
1700 package MyApp::Controller::Users;
1702 sub lst : Path('the-list') {}
1706 $c->uri_for_action('/users/lst')
1708 and it will create the URI /users/the-list.
1710 =item \@captures_and_args?
1712 Optional array reference of Captures (i.e. C<<CaptureArgs or $c->req->captures>)
1713 and arguments to the request. Usually used with L<Catalyst::DispatchType::Chained>
1714 to interpolate all the parameters in the URI.
1718 Optional list of extra arguments - can be supplied in the
1719 C<< \@captures_and_args? >> array ref, or here - whichever is easier for your
1722 Your action can have zero, a fixed or a variable number of args (e.g.
1723 C<< Args(1) >> for a fixed number or C<< Args() >> for a variable number)..
1725 =item \%query_values?
1727 Optional array reference of query parameters to append. E.g.
1733 /rest/of/your/uri?foo=bar
1739 sub uri_for_action {
1740 my ( $c, $path, @args ) = @_;
1741 my $action = blessed($path)
1743 : $c->dispatcher->get_action_by_path($path);
1744 unless (defined $action) {
1745 croak "Can't find action for path '$path'";
1747 return $c->uri_for( $action, @args );
1750 =head2 $c->welcome_message
1752 Returns the Catalyst welcome HTML page.
1756 sub welcome_message {
1758 my $name = $c->config->{name};
1759 my $logo = $c->uri_for('/static/images/catalyst_logo.png');
1760 my $prefix = Catalyst::Utils::appprefix( ref $c );
1761 $c->response->content_type('text/html; charset=utf-8');
1763 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
1764 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
1765 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
1767 <meta http-equiv="Content-Language" content="en" />
1768 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
1769 <title>$name on Catalyst $VERSION</title>
1770 <style type="text/css">
1773 background-color: #eee;
1780 margin-bottom: 10px;
1782 background-color: #ccc;
1783 border: 1px solid #aaa;
1788 font-family: verdana, tahoma, sans-serif;
1791 font-family: verdana, tahoma, sans-serif;
1794 text-decoration: none;
1796 border-bottom: 1px dotted #bbb;
1798 :link:hover, :visited:hover {
1811 background-color: #fff;
1812 border: 1px solid #aaa;
1816 font-weight: normal;
1838 <h1><span id="appname">$name</span> on <a href="http://catalyst.perl.org">Catalyst</a>
1843 <img src="$logo" alt="Catalyst Logo" />
1845 <p>Welcome to the world of Catalyst.
1846 This <a href="http://en.wikipedia.org/wiki/MVC">MVC</a>
1847 framework will make web development something you had
1848 never expected it to be: Fun, rewarding, and quick.</p>
1849 <h2>What to do now?</h2>
1850 <p>That really depends on what <b>you</b> want to do.
1851 We do, however, provide you with a few starting points.</p>
1852 <p>If you want to jump right into web development with Catalyst
1853 you might want to start with a tutorial.</p>
1854 <pre>perldoc <a href="https://metacpan.org/module/Catalyst::Manual::Tutorial">Catalyst::Manual::Tutorial</a></code>
1856 <p>Afterwards you can go on to check out a more complete look at our features.</p>
1858 <code>perldoc <a href="https://metacpan.org/module/Catalyst::Manual::Intro">Catalyst::Manual::Intro</a>
1859 <!-- Something else should go here, but the Catalyst::Manual link seems unhelpful -->
1861 <h2>What to do next?</h2>
1862 <p>Next it's time to write an actual application. Use the
1863 helper scripts to generate <a href="https://metacpan.org/search?q=Catalyst%3A%3AController">controllers</a>,
1864 <a href="https://metacpan.org/search?q=Catalyst%3A%3AModel">models</a>, and
1865 <a href="https://metacpan.org/search?q=Catalyst%3A%3AView">views</a>;
1866 they can save you a lot of work.</p>
1867 <pre><code>script/${prefix}_create.pl --help</code></pre>
1868 <p>Also, be sure to check out the vast and growing
1869 collection of <a href="http://search.cpan.org/search?query=Catalyst">plugins for Catalyst on CPAN</a>;
1870 you are likely to find what you need there.
1874 <p>Catalyst has a very active community. Here are the main places to
1875 get in touch with us.</p>
1878 <a href="http://dev.catalyst.perl.org">Wiki</a>
1881 <a href="http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/catalyst">Mailing-List</a>
1884 <a href="irc://irc.perl.org/catalyst">IRC channel #catalyst on irc.perl.org</a>
1887 <h2>In conclusion</h2>
1888 <p>The Catalyst team hopes you will enjoy using Catalyst as much
1889 as we enjoyed making it. Please contact us if you have ideas
1890 for improvement or other feedback.</p>
1900 Contains a hash of options passed from the application script, including
1901 the original ARGV the script received, the processed values from that
1902 ARGV and any extra arguments to the script which were not processed.
1904 This can be used to add custom options to your application's scripts
1905 and setup your application differently depending on the values of these
1908 =head1 INTERNAL METHODS
1910 These methods are not meant to be used by end users.
1912 =head2 $c->components
1914 Returns a hash of components.
1916 =head2 $c->context_class
1918 Returns or sets the context class.
1922 Returns a hashref containing coderefs and execution counts (needed for
1923 deep recursion detection).
1927 Returns the number of actions on the current internal execution stack.
1931 Dispatches a request to actions.
1935 sub dispatch { my $c = shift; $c->dispatcher->dispatch( $c, @_ ) }
1937 =head2 $c->dispatcher_class
1939 Returns or sets the dispatcher class.
1941 =head2 $c->dump_these
1943 Returns a list of 2-element array references (name, structure) pairs
1944 that will be dumped on the error page in debug mode.
1950 [ Request => $c->req ],
1951 [ Response => $c->res ],
1952 [ Stash => $c->stash ],
1953 [ Config => $c->config ];
1956 =head2 $c->engine_class
1958 Returns or sets the engine class.
1960 =head2 $c->execute( $class, $coderef )
1962 Execute a coderef in given class and catch exceptions. Errors are available
1968 my ( $c, $class, $code ) = @_;
1969 $class = $c->component($class) || $class;
1972 if ( $c->depth >= $RECURSION ) {
1973 my $action = $code->reverse();
1974 $action = "/$action" unless $action =~ /->/;
1975 my $error = qq/Deep recursion detected calling "${action}"/;
1976 $c->log->error($error);
1982 my $stats_info = $c->_stats_start_execute( $code ) if $c->use_stats;
1984 push( @{ $c->stack }, $code );
1986 no warnings 'recursion';
1987 # N.B. This used to be combined, but I have seen $c get clobbered if so, and
1988 # I have no idea how, ergo $ret (which appears to fix the issue)
1989 eval { my $ret = $code->execute( $class, $c, @{ $c->req->args } ) || 0; $c->state( $ret ) };
1991 $c->_stats_finish_execute( $stats_info ) if $c->use_stats and $stats_info;
1993 my $last = pop( @{ $c->stack } );
1995 if ( my $error = $@ ) {
1996 #rethow if this can be handled by middleware
1997 if ( $c->_handle_http_exception($error) ) {
1998 foreach my $err (@{$c->error}) {
1999 $c->log->error($err);
2002 $c->log->_flush if $c->log->can('_flush');
2004 $error->can('rethrow') ? $error->rethrow : croak $error;
2006 if ( blessed($error) and $error->isa('Catalyst::Exception::Detach') ) {
2007 $error->rethrow if $c->depth > 1;
2009 elsif ( blessed($error) and $error->isa('Catalyst::Exception::Go') ) {
2010 $error->rethrow if $c->depth > 0;
2013 unless ( ref $error ) {
2014 no warnings 'uninitialized';
2016 my $class = $last->class;
2017 my $name = $last->name;
2018 $error = qq/Caught exception in $class->$name "$error"/;
2027 sub _stats_start_execute {
2028 my ( $c, $code ) = @_;
2029 my $appclass = ref($c) || $c;
2030 return if ( ( $code->name =~ /^_.*/ )
2031 && ( !$appclass->config->{show_internal_actions} ) );
2033 my $action_name = $code->reverse();
2034 $c->counter->{$action_name}++;
2036 my $action = $action_name;
2037 $action = "/$action" unless $action =~ /->/;
2039 # determine if the call was the result of a forward
2040 # this is done by walking up the call stack and looking for a calling
2041 # sub of Catalyst::forward before the eval
2043 for my $index ( 2 .. 11 ) {
2045 if ( ( caller($index) )[0] eq 'Catalyst'
2046 && ( caller($index) )[3] eq '(eval)' );
2048 if ( ( caller($index) )[3] =~ /forward$/ ) {
2049 $callsub = ( caller($index) )[3];
2050 $action = "-> $action";
2055 my $uid = $action_name . $c->counter->{$action_name};
2057 # is this a root-level call or a forwarded call?
2058 if ( $callsub =~ /forward$/ ) {
2059 my $parent = $c->stack->[-1];
2061 # forward, locate the caller
2062 if ( defined $parent && exists $c->counter->{"$parent"} ) {
2065 parent => "$parent" . $c->counter->{"$parent"},
2071 # forward with no caller may come from a plugin
2090 sub _stats_finish_execute {
2091 my ( $c, $info ) = @_;
2092 $c->stats->profile( end => $info );
2097 Finalizes the request.
2104 for my $error ( @{ $c->error } ) {
2105 $c->log->error($error);
2108 # Support skipping finalize for psgix.io style 'jailbreak'. Used to support
2109 # stuff like cometd and websockets
2111 if($c->request->_has_io_fh) {
2116 # Allow engine to handle finalize flow (for POE)
2117 my $engine = $c->engine;
2118 if ( my $code = $engine->can('finalize') ) {
2123 $c->finalize_uploads;
2126 if ( $#{ $c->error } >= 0 ) {
2130 $c->finalize_encoding;
2131 $c->finalize_headers unless $c->response->finalized_headers;
2137 if ($c->use_stats) {
2138 my $elapsed = $c->stats->elapsed;
2139 my $av = $elapsed == 0 ? '??' : sprintf '%.3f', 1 / $elapsed;
2141 "Request took ${elapsed}s ($av/s)\n" . $c->stats->report . "\n" );
2144 return $c->response->status;
2147 =head2 $c->finalize_body
2153 sub finalize_body { my $c = shift; $c->engine->finalize_body( $c, @_ ) }
2155 =head2 $c->finalize_cookies
2161 sub finalize_cookies { my $c = shift; $c->engine->finalize_cookies( $c, @_ ) }
2163 =head2 $c->finalize_error
2165 Finalizes error. If there is only one error in L</error> and it is an object that
2166 does C<as_psgi> or C<code> we rethrow the error and presume it caught by middleware
2167 up the ladder. Otherwise we return the debugging error page (in debug mode) or we
2168 return the default error page (production mode).
2172 sub finalize_error {
2174 if($#{$c->error} > 0) {
2175 $c->engine->finalize_error( $c, @_ );
2177 my ($error) = @{$c->error};
2178 if ( $c->_handle_http_exception($error) ) {
2179 # In the case where the error 'knows what it wants', becauses its PSGI
2180 # aware, just rethow and let middleware catch it
2181 $error->can('rethrow') ? $error->rethrow : croak $error;
2183 $c->engine->finalize_error( $c, @_ )
2188 =head2 $c->finalize_headers
2194 sub finalize_headers {
2197 my $response = $c->response; #accessor calls can add up?
2199 # Check if we already finalized headers
2200 return if $response->finalized_headers;
2203 if ( my $location = $response->redirect ) {
2204 $c->log->debug(qq/Redirecting to "$location"/) if $c->debug;
2205 $response->header( Location => $location );
2208 # Remove incorrectly added body and content related meta data when returning
2209 # an information response, or a response the is required to not include a body
2211 $c->finalize_cookies;
2213 # This currently is a NOOP but I don't want to remove it since I guess people
2214 # might have Response subclasses that use it for something... (JNAP)
2215 $c->response->finalize_headers();
2218 $response->finalized_headers(1);
2221 =head2 $c->finalize_encoding
2223 Make sure your body is encoded properly IF you set an encoding. By
2224 default the encoding is UTF-8 but you can disable it by explicitly setting the
2225 encoding configuration value to undef.
2227 We can only encode when the body is a scalar. Methods for encoding via the
2228 streaming interfaces (such as C<write> and C<write_fh> on L<Catalyst::Response>
2235 sub finalize_encoding {
2237 my $res = $c->res || return;
2239 # Warn if the set charset is different from the one you put into encoding. We need
2240 # to do this early since encodable_response is false for this condition and we need
2241 # to match the debug output for backcompat (there's a test for this...) -JNAP
2243 $res->content_type_charset and $c->encoding and
2244 (uc($c->encoding->mime_name) ne uc($res->content_type_charset))
2246 my $ct = lc($res->content_type_charset);
2247 $c->log->debug("Catalyst encoding config is set to encode in '" .
2248 $c->encoding->mime_name .
2249 "', content type is '$ct', not encoding ");
2253 ($res->encodable_response) and
2254 (defined($res->body)) and
2255 (ref(\$res->body) eq 'SCALAR')
2257 $c->res->body( $c->encoding->encode( $c->res->body, $c->_encode_check ) );
2259 # Set the charset if necessary. This might be a bit bonkers since encodable response
2260 # is false when the set charset is not the same as the encoding mimetype (maybe
2261 # confusing action at a distance here..
2262 # Don't try to set the charset if one already exists or if headers are already finalized
2263 $c->res->content_type($c->res->content_type . "; charset=" . $c->encoding->mime_name)
2264 unless($c->res->content_type_charset ||
2265 ($c->res->_context && $c->res->finalized_headers && !$c->res->_has_response_cb));
2269 =head2 $c->finalize_output
2271 An alias for finalize_body.
2273 =head2 $c->finalize_read
2275 Finalizes the input after reading is complete.
2279 sub finalize_read { my $c = shift; $c->engine->finalize_read( $c, @_ ) }
2281 =head2 $c->finalize_uploads
2283 Finalizes uploads. Cleans up any temporary files.
2287 sub finalize_uploads { my $c = shift; $c->engine->finalize_uploads( $c, @_ ) }
2289 =head2 $c->get_action( $action, $namespace )
2291 Gets an action in a given namespace.
2295 sub get_action { my $c = shift; $c->dispatcher->get_action(@_) }
2297 =head2 $c->get_actions( $action, $namespace )
2299 Gets all actions of a given name in a namespace and all parent
2304 sub get_actions { my $c = shift; $c->dispatcher->get_actions( $c, @_ ) }
2306 =head2 $app->handle_request( @arguments )
2308 Called to handle each HTTP request.
2312 sub handle_request {
2313 my ( $class, @arguments ) = @_;
2315 # Always expect worst case!
2318 if ($class->debug) {
2319 my $secs = time - $START || 1;
2320 my $av = sprintf '%.3f', $COUNT / $secs;
2321 my $time = localtime time;
2322 $class->log->info("*** Request $COUNT ($av/s) [$$] [$time] ***");
2325 my $c = $class->prepare(@arguments);
2327 $status = $c->finalize;
2329 #rethow if this can be handled by middleware
2330 if ( $class->_handle_http_exception($_) ) {
2331 $_->can('rethrow') ? $_->rethrow : croak $_;
2333 chomp(my $error = $_);
2334 $class->log->error(qq/Caught exception in engine "$error"/);
2339 if(my $coderef = $class->log->can('_flush')){
2340 $class->log->$coderef();
2345 =head2 $class->prepare( @arguments )
2347 Creates a Catalyst context from an engine-specific request (Apache, CGI,
2354 predicate => '_has_uploadtmp',
2358 my ( $class, @arguments ) = @_;
2361 # After the app/ctxt split, this should become an attribute based on something passed
2362 # into the application.
2363 $class->context_class( ref $class || $class ) unless $class->context_class;
2365 my $uploadtmp = $class->config->{uploadtmp};
2366 my $c = $class->context_class->new({ $uploadtmp ? (_uploadtmp => $uploadtmp) : ()});
2368 $c->response->_context($c);
2370 $c->stats($class->stats_class->new)->enable($c->use_stats);
2372 if ( $c->debug || $c->config->{enable_catalyst_header} ) {
2373 $c->res->headers->header( 'X-Catalyst' => $Catalyst::VERSION );
2377 # Allow engine to direct the prepare flow (for POE)
2378 if ( my $prepare = $c->engine->can('prepare') ) {
2379 $c->engine->$prepare( $c, @arguments );
2382 $c->prepare_request(@arguments);
2383 $c->prepare_connection;
2384 $c->prepare_query_parameters;
2385 $c->prepare_headers; # Just hooks, no longer needed - they just
2386 $c->prepare_cookies; # cause the lazy attribute on req to build
2389 # Prepare the body for reading, either by prepare_body
2390 # or the user, if they are using $c->read
2393 # Parse the body unless the user wants it on-demand
2394 unless ( ref($c)->config->{parse_on_demand} ) {
2400 # VERY ugly and probably shouldn't rely on ->finalize actually working
2402 # failed prepare is always due to an invalid request, right?
2403 $c->response->status(400);
2404 $c->response->content_type('text/plain');
2405 $c->response->body('Bad Request');
2406 # Note we call finalize and then die here, which escapes
2407 # finalize being called in the enclosing block..
2408 # It in fact couldn't be called, as we don't return $c..
2409 # This is a mess - but I'm unsure you can fix this without
2410 # breaking compat for people doing crazy things (we should set
2411 # the 400 and just return the ctx here IMO, letting finalize get called
2422 =head2 $c->prepare_action
2424 Prepares action. See L<Catalyst::Dispatcher>.
2428 sub prepare_action {
2430 my $ret = $c->dispatcher->prepare_action( $c, @_);
2433 foreach (@{$c->req->arguments}, @{$c->req->captures}) {
2434 $_ = $c->_handle_param_unicode_decoding($_);
2442 =head2 $c->prepare_body
2444 Prepares message body.
2451 return if $c->request->_has_body;
2453 # Initialize on-demand data
2454 $c->engine->prepare_body( $c, @_ );
2455 $c->prepare_parameters;
2456 $c->prepare_uploads;
2459 =head2 $c->prepare_body_chunk( $chunk )
2461 Prepares a chunk of data before sending it to L<HTTP::Body>.
2463 See L<Catalyst::Engine>.
2467 sub prepare_body_chunk {
2469 $c->engine->prepare_body_chunk( $c, @_ );
2472 =head2 $c->prepare_body_parameters
2474 Prepares body parameters.
2478 sub prepare_body_parameters {
2480 $c->request->prepare_body_parameters( $c, @_ );
2483 =head2 $c->prepare_connection
2485 Prepares connection.
2489 sub prepare_connection {
2491 $c->request->prepare_connection($c);
2494 =head2 $c->prepare_cookies
2496 Prepares cookies by ensuring that the attribute on the request
2497 object has been built.
2501 sub prepare_cookies { my $c = shift; $c->request->cookies }
2503 =head2 $c->prepare_headers
2505 Prepares request headers by ensuring that the attribute on the request
2506 object has been built.
2510 sub prepare_headers { my $c = shift; $c->request->headers }
2512 =head2 $c->prepare_parameters
2514 Prepares parameters.
2518 sub prepare_parameters {
2520 $c->prepare_body_parameters;
2521 $c->engine->prepare_parameters( $c, @_ );
2524 =head2 $c->prepare_path
2526 Prepares path and base.
2530 sub prepare_path { my $c = shift; $c->engine->prepare_path( $c, @_ ) }
2532 =head2 $c->prepare_query_parameters
2534 Prepares query parameters.
2538 sub prepare_query_parameters {
2541 $c->engine->prepare_query_parameters( $c, @_ );
2544 =head2 $c->log_request
2546 Writes information about the request to the debug logs. This includes:
2550 =item * Request method, path, and remote IP address
2552 =item * Query keywords (see L<Catalyst::Request/query_keywords>)
2554 =item * Request parameters
2556 =item * File uploads
2565 return unless $c->debug;
2567 my($dump) = grep {$_->[0] eq 'Request' } $c->dump_these;
2568 my $request = $dump->[1];
2570 my ( $method, $path, $address ) = ( $request->method, $request->path, $request->address );
2572 $path = '/' unless length $path;
2575 $path =~ s/%([0-9A-Fa-f]{2})/chr(hex($1))/eg;
2576 $path = decode_utf8($path);
2578 $c->log->debug(qq/"$method" request for "$path" from "$address"/);
2580 $c->log_request_headers($request->headers);
2582 if ( my $keywords = $request->query_keywords ) {
2583 $c->log->debug("Query keywords are: $keywords");
2586 $c->log_request_parameters( query => $request->query_parameters, $request->_has_body ? (body => $request->body_parameters) : () );
2588 $c->log_request_uploads($request);
2591 =head2 $c->log_response
2593 Writes information about the response to the debug logs by calling
2594 C<< $c->log_response_status_line >> and C<< $c->log_response_headers >>.
2601 return unless $c->debug;
2603 my($dump) = grep {$_->[0] eq 'Response' } $c->dump_these;
2604 my $response = $dump->[1];
2606 $c->log_response_status_line($response);
2607 $c->log_response_headers($response->headers);
2610 =head2 $c->log_response_status_line($response)
2612 Writes one line of information about the response to the debug logs. This includes:
2616 =item * Response status code
2618 =item * Content-Type header (if present)
2620 =item * Content-Length header (if present)
2626 sub log_response_status_line {
2627 my ($c, $response) = @_;
2631 'Response Code: %s; Content-Type: %s; Content-Length: %s',
2632 $response->status || 'unknown',
2633 $response->headers->header('Content-Type') || 'unknown',
2634 $response->headers->header('Content-Length') || 'unknown'
2639 =head2 $c->log_response_headers($headers);
2641 Hook method which can be wrapped by plugins to log the response headers.
2642 No-op in the default implementation.
2646 sub log_response_headers {}
2648 =head2 $c->log_request_parameters( query => {}, body => {} )
2650 Logs request parameters to debug logs
2654 sub log_request_parameters {
2656 my %all_params = @_;
2658 return unless $c->debug;
2660 my $column_width = Catalyst::Utils::term_width() - 44;
2661 foreach my $type (qw(query body)) {
2662 my $params = $all_params{$type};
2663 next if ! keys %$params;
2664 my $t = Text::SimpleTable->new( [ 35, 'Parameter' ], [ $column_width, 'Value' ] );
2665 for my $key ( sort keys %$params ) {
2666 my $param = $params->{$key};
2667 my $value = defined($param) ? $param : '';
2668 $t->row( $key, ref $value eq 'ARRAY' ? ( join ', ', @$value ) : $value );
2670 $c->log->debug( ucfirst($type) . " Parameters are:\n" . $t->draw );
2674 =head2 $c->log_request_uploads
2676 Logs file uploads included in the request to the debug logs.
2677 The parameter name, filename, file type, and file size are all included in
2682 sub log_request_uploads {
2684 my $request = shift;
2685 return unless $c->debug;
2686 my $uploads = $request->uploads;
2687 if ( keys %$uploads ) {
2688 my $t = Text::SimpleTable->new(
2689 [ 12, 'Parameter' ],
2694 for my $key ( sort keys %$uploads ) {
2695 my $upload = $uploads->{$key};
2696 for my $u ( ref $upload eq 'ARRAY' ? @{$upload} : ($upload) ) {
2697 $t->row( $key, $u->filename, $u->type, $u->size );
2700 $c->log->debug( "File Uploads are:\n" . $t->draw );
2704 =head2 $c->log_request_headers($headers);
2706 Hook method which can be wrapped by plugins to log the request headers.
2707 No-op in the default implementation.
2711 sub log_request_headers {}
2713 =head2 $c->log_headers($type => $headers)
2715 Logs L<HTTP::Headers> (either request or response) to the debug logs.
2722 my $headers = shift; # an HTTP::Headers instance
2724 return unless $c->debug;
2726 my $column_width = Catalyst::Utils::term_width() - 28;
2727 my $t = Text::SimpleTable->new( [ 15, 'Header Name' ], [ $column_width, 'Value' ] );
2730 my ( $name, $value ) = @_;
2731 $t->row( $name, $value );
2734 $c->log->debug( ucfirst($type) . " Headers:\n" . $t->draw );
2738 =head2 $c->prepare_read
2740 Prepares the input for reading.
2744 sub prepare_read { my $c = shift; $c->engine->prepare_read( $c, @_ ) }
2746 =head2 $c->prepare_request
2748 Prepares the engine request.
2752 sub prepare_request { my $c = shift; $c->engine->prepare_request( $c, @_ ) }
2754 =head2 $c->prepare_uploads
2760 sub prepare_uploads {
2762 $c->engine->prepare_uploads( $c, @_ );
2765 =head2 $c->prepare_write
2767 Prepares the output for writing.
2771 sub prepare_write { my $c = shift; $c->engine->prepare_write( $c, @_ ) }
2773 =head2 $c->request_class
2775 Returns or sets the request class. Defaults to L<Catalyst::Request>.
2777 =head2 $app->request_class_traits
2779 An arrayref of L<Moose::Role>s which are applied to the request class. You can
2780 name the full namespace of the role, or a namespace suffix, which will then
2781 be tried against the following standard namespace prefixes.
2783 $MyApp::TraitFor::Request::$trait_suffix
2784 Catalyst::TraitFor::Request::$trait_suffix
2786 So for example if you set:
2788 MyApp->request_class_traits(['Foo']);
2790 We try each possible role in turn (and throw an error if none load)
2793 MyApp::TraitFor::Request::Foo
2794 Catalyst::TraitFor::Request::Foo
2796 The namespace part 'TraitFor::Request' was choosen to assist in backwards
2797 compatibility with L<CatalystX::RoleApplicator> which previously provided
2798 these features in a stand alone package.
2800 =head2 $app->composed_request_class
2802 This is the request class which has been composed with any request_class_traits.
2804 =head2 $c->response_class
2806 Returns or sets the response class. Defaults to L<Catalyst::Response>.
2808 =head2 $app->response_class_traits
2810 An arrayref of L<Moose::Role>s which are applied to the response class. You can
2811 name the full namespace of the role, or a namespace suffix, which will then
2812 be tried against the following standard namespace prefixes.
2814 $MyApp::TraitFor::Response::$trait_suffix
2815 Catalyst::TraitFor::Response::$trait_suffix
2817 So for example if you set:
2819 MyApp->response_class_traits(['Foo']);
2821 We try each possible role in turn (and throw an error if none load)
2824 MyApp::TraitFor::Response::Foo
2825 Catalyst::TraitFor::Responset::Foo
2827 The namespace part 'TraitFor::Response' was choosen to assist in backwards
2828 compatibility with L<CatalystX::RoleApplicator> which previously provided
2829 these features in a stand alone package.
2832 =head2 $app->composed_response_class
2834 This is the request class which has been composed with any response_class_traits.
2836 =head2 $c->read( [$maxlength] )
2838 Reads a chunk of data from the request body. This method is designed to
2839 be used in a while loop, reading C<$maxlength> bytes on every call.
2840 C<$maxlength> defaults to the size of the request if not specified.
2842 You have to set C<< MyApp->config(parse_on_demand => 1) >> to use this
2845 Warning: If you use read(), Catalyst will not process the body,
2846 so you will not be able to access POST parameters or file uploads via
2847 $c->request. You must handle all body parsing yourself.
2851 sub read { my $c = shift; return $c->request->read( @_ ) }
2861 $app->_make_immutable_if_needed;
2862 $app->engine_loader->needs_psgi_engine_compat_hack ?
2863 $app->engine->run($app, @_) :
2864 $app->engine->run( $app, $app->_finalized_psgi_app, @_ );
2867 sub _make_immutable_if_needed {
2869 my $meta = find_meta($class);
2870 my $isa_ca = $class->isa('Class::Accessor::Fast') || $class->isa('Class::Accessor');
2873 && ! { $meta->immutable_options }->{replace_constructor}
2876 warn("You made your application class ($class) immutable, "
2877 . "but did not inline the\nconstructor. "
2878 . "This will break catalyst, as your app \@ISA "
2879 . "Class::Accessor(::Fast)?\nPlease pass "
2880 . "(replace_constructor => 1)\nwhen making your class immutable.\n");
2882 unless ($meta->is_immutable) {
2883 # XXX - FIXME warning here as you should make your app immutable yourself.
2884 $meta->make_immutable(
2885 replace_constructor => 1,
2890 =head2 $c->set_action( $action, $code, $namespace, $attrs )
2892 Sets an action in a given namespace.
2896 sub set_action { my $c = shift; $c->dispatcher->set_action( $c, @_ ) }
2898 =head2 $c->setup_actions($component)
2900 Sets up actions for a component.
2904 sub setup_actions { my $c = shift; $c->dispatcher->setup_actions( $c, @_ ) }
2906 =head2 $c->setup_components
2908 This method is called internally to set up the application's components.
2910 It finds modules by calling the L<locate_components> method, expands them to
2911 package names with the L<expand_component_module> method, and then installs
2912 each component into the application.
2914 The C<setup_components> config option is passed to both of the above methods.
2916 Installation of each component is performed by the L<setup_component> method,
2921 sub setup_components {
2924 my $config = $class->config->{ setup_components };
2926 my @comps = $class->locate_components($config);
2927 my %comps = map { $_ => 1 } @comps;
2929 my $deprecatedcatalyst_component_names = grep { /::[CMV]::/ } @comps;
2930 $class->log->warn(qq{Your application is using the deprecated ::[MVC]:: type naming scheme.\n}.
2931 qq{Please switch your class names to ::Model::, ::View:: and ::Controller: as appropriate.\n}
2932 ) if $deprecatedcatalyst_component_names;
2934 for my $component ( @comps ) {
2936 # We pass ignore_loaded here so that overlay files for (e.g.)
2937 # Model::DBI::Schema sub-classes are loaded - if it's in @comps
2938 # we know M::P::O found a file on disk so this is safe
2940 Catalyst::Utils::ensure_class_loaded( $component, { ignore_loaded => 1 } );
2943 for my $component (@comps) {
2944 my $instance = $class->components->{ $component } = $class->delayed_setup_component($component);
2947 # Inject a component or wrap a stand alone class in an adaptor. This makes a list
2948 # of named components in the configuration that are not actually existing (not a
2951 my @injected = $class->setup_injected_components;
2953 # All components are registered, now we need to 'init' them.
2954 foreach my $component_name (@comps, @injected) {
2955 $class->components->{$component_name} = $class->components->{$component_name}->() if
2956 (ref($class->components->{$component_name}) || '') eq 'CODE';
2960 =head2 $app->setup_injected_components
2962 Called by setup_compoents to setup components that are injected.
2966 sub setup_injected_components {
2968 my @injected_components = keys %{$class->config->{inject_components} ||+{}};
2970 foreach my $injected_comp_name(@injected_components) {
2971 $class->setup_injected_component(
2972 $injected_comp_name,
2973 $class->config->{inject_components}->{$injected_comp_name});
2976 return map { $class ."::" . $_ }
2977 @injected_components;
2980 =head2 $app->setup_injected_component( $injected_component_name, $config )
2982 Setup a given injected component.
2986 sub setup_injected_component {
2987 my ($class, $injected_comp_name, $config) = @_;
2988 if(my $component_class = $config->{from_component}) {
2989 my @roles = @{$config->{roles} ||[]};
2990 Catalyst::Utils::inject_component(
2992 component => $component_class,
2993 (scalar(@roles) ? (traits => \@roles) : ()),
2994 as => $injected_comp_name);
2998 =head2 $app->inject_component($MyApp_Component_name => \%args);
3000 Add a component that is injected at setup:
3002 MyApp->inject_component( 'Model::Foo' => { from_component => 'Common::Foo' } );
3004 Must be called before ->setup. Expects a component name for your
3005 current application and \%args where
3009 =item from_component
3011 The target component being injected into your application
3015 An arrayref of L<Moose::Role>s that are applied to your component.
3021 MyApp->inject_component(
3023 from_component => 'Common::Model::Foo',
3024 roles => ['Role1', 'Role2'],
3027 =head2 $app->inject_components
3029 Inject a list of components:
3031 MyApp->inject_components(
3032 'Model::FooOne' => {
3033 from_component => 'Common::Model::Foo',
3034 roles => ['Role1', 'Role2'],
3036 'Model::FooTwo' => {
3037 from_component => 'Common::Model::Foo',
3038 roles => ['Role1', 'Role2'],
3043 sub inject_component {
3044 my ($app, $name, $args) = @_;
3045 die "Component $name exists" if
3046 $app->config->{inject_components}->{$name};
3047 $app->config->{inject_components}->{$name} = $args;
3050 sub inject_components {
3053 $app->inject_component(shift, shift);
3057 =head2 $c->locate_components( $setup_component_config )
3059 This method is meant to provide a list of component modules that should be
3060 setup for the application. By default, it will use L<Module::Pluggable>.
3062 Specify a C<setup_components> config option to pass additional options directly
3063 to L<Module::Pluggable>. To add additional search paths, specify a key named
3064 C<search_extra> as an array reference. Items in the array beginning with C<::>
3065 will have the application class name prepended to them.
3069 sub locate_components {
3073 my @paths = qw( ::M ::Model ::V ::View ::C ::Controller );
3074 my $extra = delete $config->{ search_extra } || [];
3076 unshift @paths, @$extra;
3078 my @comps = map { sort { length($a) <=> length($b) } Module::Pluggable::Object->new(
3079 search_path => [ map { s/^(?=::)/$class/; $_; } ($_) ],
3081 )->plugins } @paths;
3086 =head2 $c->expand_component_module( $component, $setup_component_config )
3088 Components found by C<locate_components> will be passed to this method, which
3089 is expected to return a list of component (package) names to be set up.
3093 sub expand_component_module {
3094 my ($class, $module) = @_;
3095 return Devel::InnerPackage::list_packages( $module );
3098 =head2 $app->delayed_setup_component
3100 Returns a coderef that points to a setup_component instance. Used
3101 internally for when you want to delay setup until the first time
3102 the component is called.
3106 sub delayed_setup_component {
3107 my($class, $component, @more) = @_;
3109 return my $instance = $class->setup_component($component, @more);
3113 =head2 $c->setup_component
3117 sub setup_component {
3118 my( $class, $component ) = @_;
3120 unless ( $component->can( 'COMPONENT' ) ) {
3124 my $config = $class->config_for($component);
3125 # Stash catalyst_component_name in the config here, so that custom COMPONENT
3126 # methods also pass it. local to avoid pointlessly shitting in config
3127 # for the debug screen, as $component is already the key name.
3128 local $config->{catalyst_component_name} = $component;
3130 my $instance = eval {
3131 $component->COMPONENT( $class, $config );
3135 Catalyst::Exception->throw(
3136 message => qq/Couldn't instantiate component "$component", "$error"/
3140 unless (blessed $instance) {
3141 my $metaclass = Moose::Util::find_meta($component);
3142 my $method_meta = $metaclass->find_method_by_name('COMPONENT');
3143 my $component_method_from = $method_meta->associated_metaclass->name;
3144 my $value = defined($instance) ? $instance : 'undef';
3145 Catalyst::Exception->throw(
3147 qq/Couldn't instantiate component "$component", COMPONENT() method (from $component_method_from) didn't return an object-like value (value was $value)./
3151 my @expanded_components = $instance->can('expand_modules')
3152 ? $instance->expand_modules( $component, $config )
3153 : $class->expand_component_module( $component, $config );
3154 for my $component (@expanded_components) {
3155 next if $class->components->{ $component };
3156 $class->components->{ $component } = $class->setup_component($component);
3162 =head2 $app->config_for( $component_name )
3164 Return the application level configuration (which is not yet merged with any
3165 local component configuration, via $component_class->config) for the named
3166 component or component object. Example:
3169 'Model::Foo' => { a => 1, b => 2},
3172 my $config = MyApp->config_for('MyApp::Model::Foo');
3174 In this case $config is the hashref C< {a=>1, b=>2} >.
3176 This is also handy for looking up configuration for a plugin, to make sure you follow
3177 existing L<Catalyst> standards for where a plugin should put its configuration.
3182 my ($class, $component_name) = @_;
3183 my $component_suffix = Catalyst::Utils::class2classsuffix($component_name);
3184 my $config = $class->config->{ $component_suffix } || {};
3189 =head2 $c->setup_dispatcher
3195 sub setup_dispatcher {
3196 my ( $class, $dispatcher ) = @_;
3199 $dispatcher = 'Catalyst::Dispatcher::' . $dispatcher;
3202 if ( my $env = Catalyst::Utils::env_value( $class, 'DISPATCHER' ) ) {
3203 $dispatcher = 'Catalyst::Dispatcher::' . $env;
3206 unless ($dispatcher) {
3207 $dispatcher = $class->dispatcher_class;
3210 load_class($dispatcher);
3212 # dispatcher instance
3213 $class->dispatcher( $dispatcher->new );
3216 =head2 $c->setup_engine
3223 my ($class, $requested_engine) = @_;
3225 if (!$class->engine_loader || $requested_engine) {
3226 $class->engine_loader(
3227 Catalyst::EngineLoader->new({
3228 application_name => $class,
3229 (defined $requested_engine
3230 ? (catalyst_engine_class => $requested_engine) : ()),
3235 $class->engine_loader->catalyst_engine_class;
3239 my ($class, $requested_engine) = @_;
3242 my $loader = $class->engine_loader;
3244 if (!$loader || $requested_engine) {
3245 $loader = Catalyst::EngineLoader->new({
3246 application_name => $class,
3247 (defined $requested_engine
3248 ? (requested_engine => $requested_engine) : ()),
3251 $class->engine_loader($loader);
3254 $loader->catalyst_engine_class;
3257 # Don't really setup_engine -- see _setup_psgi_app for explanation.
3258 return if $class->loading_psgi_file;
3260 load_class($engine);
3262 if ($ENV{MOD_PERL}) {
3263 my $apache = $class->engine_loader->auto;
3265 my $meta = find_meta($class);
3266 my $was_immutable = $meta->is_immutable;
3267 my %immutable_options = $meta->immutable_options;
3268 $meta->make_mutable if $was_immutable;
3270 $meta->add_method(handler => sub {
3272 my $psgi_app = $class->_finalized_psgi_app;
3273 $apache->call_app($r, $psgi_app);
3276 $meta->make_immutable(%immutable_options) if $was_immutable;
3279 $class->engine( $engine->new );
3284 ## This exists just to supply a prebuild psgi app for mod_perl and for the
3285 ## build in server support (back compat support for pre psgi port behavior).
3286 ## This is so that we don't build a new psgi app for each request when using
3287 ## the mod_perl handler or the built in servers (http and fcgi, etc).
3289 sub _finalized_psgi_app {
3292 unless ($app->_psgi_app) {
3293 my $psgi_app = $app->_setup_psgi_app;
3294 $app->_psgi_app($psgi_app);
3297 return $app->_psgi_app;
3300 ## Look for a psgi file like 'myapp_web.psgi' (if the app is MyApp::Web) in the
3301 ## home directory and load that and return it (just assume it is doing the
3302 ## right thing :) ). If that does not exist, call $app->psgi_app, wrap that
3303 ## in default_middleware and return it ( this is for backward compatibility
3304 ## with pre psgi port behavior ).
3306 sub _setup_psgi_app {
3309 for my $home (Path::Class::Dir->new($app->config->{home})) {
3310 my $psgi_file = $home->file(
3311 Catalyst::Utils::appprefix($app) . '.psgi',
3314 next unless -e $psgi_file;
3316 # If $psgi_file calls ->setup_engine, it's doing so to load
3317 # Catalyst::Engine::PSGI. But if it does that, we're only going to
3318 # throw away the loaded PSGI-app and load the 5.9 Catalyst::Engine
3319 # anyway. So set a flag (ick) that tells setup_engine not to populate
3320 # $c->engine or do any other things we might regret.
3322 $app->loading_psgi_file(1);
3323 my $psgi_app = Plack::Util::load_psgi($psgi_file);
3324 $app->loading_psgi_file(0);
3327 unless $app->engine_loader->needs_psgi_engine_compat_hack;
3330 Found a legacy Catalyst::Engine::PSGI .psgi file at ${psgi_file}.
3332 Its content has been ignored. Please consult the Catalyst::Upgrading
3333 documentation on how to upgrade from Catalyst::Engine::PSGI.
3337 return $app->apply_default_middlewares($app->psgi_app);
3340 =head2 $c->apply_default_middlewares
3342 Adds the following L<Plack> middlewares to your application, since they are
3343 useful and commonly needed:
3345 L<Plack::Middleware::LighttpdScriptNameFix> (if you are using Lighttpd),
3346 L<Plack::Middleware::IIS6ScriptNameFix> (always applied since this middleware
3347 is smart enough to conditionally apply itself).
3349 We will also automatically add L<Plack::Middleware::ReverseProxy> if we notice
3350 that your HTTP $env variable C<REMOTE_ADDR> is '127.0.0.1'. This is usually
3351 an indication that your server is running behind a proxy frontend. However in
3352 2014 this is often not the case. We preserve this code for backwards compatibility
3353 however I B<highly> recommend that if you are running the server behind a front
3354 end proxy that you clearly indicate so with the C<using_frontend_proxy> configuration
3355 setting to true for your environment configurations that run behind a proxy. This
3356 way if you change your front end proxy address someday your code would inexplicably
3357 stop working as expected.
3359 Additionally if we detect we are using Nginx, we add a bit of custom middleware
3360 to solve some problems with the way that server handles $ENV{PATH_INFO} and
3363 Please B<NOTE> that if you do use C<using_frontend_proxy> the middleware is now
3364 adding via C<registered_middleware> rather than this method.
3366 If you are using Lighttpd or IIS6 you may wish to apply these middlewares. In
3367 general this is no longer a common case but we have this here for backward
3373 sub apply_default_middlewares {
3374 my ($app, $psgi_app) = @_;
3376 # Don't add this conditional IF we are explicitly saying we want the
3377 # frontend proxy support. We don't need it here since if that is the
3378 # case it will be always loaded in the default_middleware.
3380 unless($app->config->{using_frontend_proxy}) {
3381 $psgi_app = Plack::Middleware::Conditional->wrap(
3383 builder => sub { Plack::Middleware::ReverseProxy->wrap($_[0]) },
3386 return if $app->config->{ignore_frontend_proxy};
3387 return $env->{REMOTE_ADDR} eq '127.0.0.1';
3392 # If we're running under Lighttpd, swap PATH_INFO and SCRIPT_NAME
3393 # http://lists.scsys.co.uk/pipermail/catalyst/2006-June/008361.html
3394 $psgi_app = Plack::Middleware::Conditional->wrap(
3396 builder => sub { Plack::Middleware::LighttpdScriptNameFix->wrap($_[0]) },
3399 return unless $env->{SERVER_SOFTWARE} && $env->{SERVER_SOFTWARE} =~ m!lighttpd[-/]1\.(\d+\.\d+)!;
3400 return unless $1 < 4.23;
3405 # we're applying this unconditionally as the middleware itself already makes
3406 # sure it doesn't fuck things up if it's not running under one of the right
3408 $psgi_app = Plack::Middleware::IIS6ScriptNameFix->wrap($psgi_app);
3410 # And another IIS issue, this time with IIS7.
3411 $psgi_app = Plack::Middleware::Conditional->wrap(
3413 builder => sub { Plack::Middleware::IIS7KeepAliveFix->wrap($_[0]) },
3416 return $env->{SERVER_SOFTWARE} && $env->{SERVER_SOFTWARE} =~ m!IIS/7\.[0-9]!;
3423 =head2 App->psgi_app
3427 Returns a PSGI application code reference for the catalyst application
3428 C<$c>. This is the bare application created without the C<apply_default_middlewares>
3429 method called. We do however apply C<registered_middleware> since those are
3430 integral to how L<Catalyst> functions. Also, unlike starting your application
3431 with a generated server script (via L<Catalyst::Devel> and C<catalyst.pl>) we do
3432 not attempt to return a valid L<PSGI> application using any existing C<${myapp}.psgi>
3433 scripts in your $HOME directory.
3435 B<NOTE> C<apply_default_middlewares> was originally created when the first PSGI
3436 port was done for v5.90000. These are middlewares that are added to achieve
3437 backward compatibility with older applications. If you start your application
3438 using one of the supplied server scripts (generated with L<Catalyst::Devel> and
3439 the project skeleton script C<catalyst.pl>) we apply C<apply_default_middlewares>
3440 automatically. This was done so that pre and post PSGI port applications would
3443 This is what you want to be using to retrieve the PSGI application code
3444 reference of your Catalyst application for use in a custom F<.psgi> or in your
3445 own created server modules.
3449 *to_app = \&psgi_app;
3453 my $psgi = $app->engine->build_psgi_app($app);
3454 return $app->Catalyst::Utils::apply_registered_middleware($psgi);
3457 =head2 $c->setup_home
3459 Sets up the home directory.
3464 my ( $class, $home ) = @_;
3466 if ( my $env = Catalyst::Utils::env_value( $class, 'HOME' ) ) {
3470 $home ||= Catalyst::Utils::home($class);
3473 #I remember recently being scolded for assigning config values like this
3474 $class->config->{home} ||= $home;
3475 $class->config->{root} ||= Path::Class::Dir->new($home)->subdir('root');
3479 =head2 $c->setup_encoding
3481 Sets up the input/output encoding. See L<ENCODING>
3485 sub setup_encoding {
3487 if( exists($c->config->{encoding}) && !defined($c->config->{encoding}) ) {
3488 # Ok, so the user has explicitly said "I don't want encoding..."
3491 my $enc = defined($c->config->{encoding}) ?
3492 delete $c->config->{encoding} : 'UTF-8'; # not sure why we delete it... (JNAP)
3497 =head2 handle_unicode_encoding_exception
3499 Hook to let you customize how encoding errors are handled. By default
3500 we just throw an exception. Receives a hashref of debug information.
3503 $c->handle_unicode_encoding_exception({
3504 param_value => $value,
3506 encoding_step => 'params',
3511 sub handle_unicode_encoding_exception {
3512 my ( $self, $exception_ctx ) = @_;
3513 die $exception_ctx->{error_msg};
3516 # Some unicode helpers cargo culted from the old plugin. These could likely
3519 sub _handle_unicode_decoding {
3520 my ( $self, $value ) = @_;
3522 return unless defined $value;
3524 ## I think this mess is to support the old nested
3525 if ( ref $value eq 'ARRAY' ) {
3526 foreach ( @$value ) {
3527 $_ = $self->_handle_unicode_decoding($_);
3531 elsif ( ref $value eq 'HASH' ) {
3532 foreach (keys %$value) {
3533 my $encoded_key = $self->_handle_param_unicode_decoding($_);
3534 $value->{$encoded_key} = $self->_handle_unicode_decoding($value->{$_});
3536 # If the key was encoded we now have two (the original and current so
3537 # delete the original.
3538 delete $value->{$_} if $_ ne $encoded_key;
3543 return $self->_handle_param_unicode_decoding($value);
3547 sub _handle_param_unicode_decoding {
3548 my ( $self, $value ) = @_;
3549 return unless defined $value; # not in love with just ignoring undefs - jnap
3550 return $value if blessed($value); #don't decode when the value is an object.
3552 my $enc = $self->encoding;
3554 $enc->decode( $value, $self->_encode_check );
3557 $self->handle_unicode_encoding_exception({
3558 param_value => $value,
3560 encoding_step => 'params',
3565 =head2 $c->setup_log
3567 Sets up log by instantiating a L<Catalyst::Log|Catalyst::Log> object and
3568 passing it to C<log()>. Pass in a comma-delimited list of levels to set the
3571 This method also installs a C<debug> method that returns a true value into the
3572 catalyst subclass if the "debug" level is passed in the comma-delimited list,
3573 or if the C<$CATALYST_DEBUG> environment variable is set to a true value.
3575 Note that if the log has already been setup, by either a previous call to
3576 C<setup_log> or by a call such as C<< __PACKAGE__->log( MyLogger->new ) >>,
3577 that this method won't actually set up the log object.
3582 my ( $class, $levels ) = @_;
3585 $levels =~ s/^\s+//;
3586 $levels =~ s/\s+$//;
3587 my %levels = map { $_ => 1 } split /\s*,\s*/, $levels;
3589 my $env_debug = Catalyst::Utils::env_value( $class, 'DEBUG' );
3590 if ( defined $env_debug ) {
3591 $levels{debug} = 1 if $env_debug; # Ugly!
3592 delete($levels{debug}) unless $env_debug;
3595 unless ( $class->log ) {
3596 $class->log( Catalyst::Log->new(keys %levels) );
3599 if ( $levels{debug} ) {
3600 Class::MOP::get_metaclass_by_name($class)->add_method('debug' => sub { 1 });
3601 $class->log->debug('Debug messages enabled');
3605 =head2 $c->setup_plugins
3611 =head2 $c->setup_stats
3613 Sets up timing statistics class.
3618 my ( $class, $stats ) = @_;
3620 Catalyst::Utils::ensure_class_loaded($class->stats_class);
3622 my $env = Catalyst::Utils::env_value( $class, 'STATS' );
3623 if ( defined($env) ? $env : ($stats || $class->debug ) ) {
3624 Class::MOP::get_metaclass_by_name($class)->add_method('use_stats' => sub { 1 });
3625 $class->log->debug('Statistics enabled');
3630 =head2 $c->registered_plugins
3632 Returns a sorted list of the plugins which have either been stated in the
3635 If passed a given plugin name, it will report a boolean value indicating
3636 whether or not that plugin is loaded. A fully qualified name is required if
3637 the plugin name does not begin with C<Catalyst::Plugin::>.
3639 if ($c->registered_plugins('Some::Plugin')) {
3647 sub registered_plugins {
3649 return sort keys %{ $proto->_plugins } unless @_;
3651 return 1 if exists $proto->_plugins->{$plugin};
3652 return exists $proto->_plugins->{"Catalyst::Plugin::$plugin"};
3655 sub _register_plugin {
3656 my ( $proto, $plugin, $instant ) = @_;
3657 my $class = ref $proto || $proto;
3659 load_class( $plugin );
3660 $class->log->warn( "$plugin inherits from 'Catalyst::Component' - this is deprecated and will not work in 5.81" )
3661 if $plugin->isa( 'Catalyst::Component' );
3662 my $plugin_meta = Moose::Meta::Class->create($plugin);
3663 if (!$plugin_meta->has_method('new')
3664 && ( $plugin->isa('Class::Accessor::Fast') || $plugin->isa('Class::Accessor') ) ) {
3665 $plugin_meta->add_method('new', Moose::Object->meta->get_method('new'))
3667 if (!$instant && !$proto->_plugins->{$plugin}) {
3668 my $meta = Class::MOP::get_metaclass_by_name($class);
3669 $meta->superclasses($plugin, $meta->superclasses);
3671 $proto->_plugins->{$plugin} = 1;
3675 sub _default_plugins { return qw() }
3678 my ( $class, $plugins ) = @_;
3680 $class->_plugins( {} ) unless $class->_plugins;
3682 m/Unicode::Encoding/ ? do {
3684 'Unicode::Encoding plugin is auto-applied,'
3685 . ' please remove this from your appclass'
3686 . ' and make sure to define "encoding" config'
3688 unless (exists $class->config->{'encoding'}) {
3689 $class->config->{'encoding'} = 'UTF-8';
3694 push @$plugins, $class->_default_plugins;
3695 $plugins = Data::OptList::mkopt($plugins || []);
3698 [ Catalyst::Utils::resolve_namespace(
3699 $class . '::Plugin',
3700 'Catalyst::Plugin', $_->[0]
3706 for my $plugin ( reverse @plugins ) {
3707 load_class($plugin->[0], $plugin->[1]);
3708 my $meta = find_meta($plugin->[0]);
3709 next if $meta && $meta->isa('Moose::Meta::Role');
3711 $class->_register_plugin($plugin->[0]);
3715 map { $_->[0]->name, $_->[1] }
3716 grep { blessed($_->[0]) && $_->[0]->isa('Moose::Meta::Role') }
3717 map { [find_meta($_->[0]), $_->[1]] }
3720 Moose::Util::apply_all_roles(
3726 =head2 default_middleware
3728 Returns a list of instantiated PSGI middleware objects which is the default
3729 middleware that is active for this application (taking any configuration
3730 options into account, excluding your custom added middleware via the C<psgi_middleware>
3731 configuration option). You can override this method if you wish to change
3732 the default middleware (although do so at risk since some middleware is vital
3733 to application function.)
3735 The current default middleware list is:
3737 Catalyst::Middleware::Stash
3738 Plack::Middleware::HTTPExceptions
3739 Plack::Middleware::RemoveRedundantBody
3740 Plack::Middleware::FixMissingBodyInRedirect
3741 Plack::Middleware::ContentLength
3742 Plack::Middleware::MethodOverride
3743 Plack::Middleware::Head
3745 If the configuration setting C<using_frontend_proxy> is true we add:
3747 Plack::Middleware::ReverseProxy
3749 If the configuration setting C<using_frontend_proxy_path> is true we add:
3751 Plack::Middleware::ReverseProxyPath
3753 But B<NOTE> that L<Plack::Middleware::ReverseProxyPath> is not a dependency of the
3754 L<Catalyst> distribution so if you want to use this option you should add it to
3755 your project distribution file.
3757 These middlewares will be added at L</setup_middleware> during the
3758 L</setup> phase of application startup.
3762 sub default_middleware {
3765 Catalyst::Middleware::Stash->new,
3766 Plack::Middleware::HTTPExceptions->new,
3767 Plack::Middleware::RemoveRedundantBody->new,
3768 Plack::Middleware::FixMissingBodyInRedirect->new,
3769 Plack::Middleware::ContentLength->new,
3770 Plack::Middleware::MethodOverride->new,
3771 Plack::Middleware::Head->new);
3773 if($class->config->{using_frontend_proxy}) {
3774 push @mw, Plack::Middleware::ReverseProxy->new;
3777 if($class->config->{using_frontend_proxy_path}) {
3778 if(Class::Load::try_load_class('Plack::Middleware::ReverseProxyPath')) {
3779 push @mw, Plack::Middleware::ReverseProxyPath->new;
3781 $class->log->error("Cannot use configuration 'using_frontend_proxy_path' because 'Plack::Middleware::ReverseProxyPath' is not installed");
3788 =head2 registered_middlewares
3790 Read only accessor that returns an array of all the middleware in the order
3791 that they were added (which is the REVERSE of the order they will be applied).
3793 The values returned will be either instances of L<Plack::Middleware> or of a
3794 compatible interface, or a coderef, which is assumed to be inlined middleware
3796 =head2 setup_middleware (?@middleware)
3798 Read configuration information stored in configuration key C<psgi_middleware> or
3801 See under L</CONFIGURATION> information regarding C<psgi_middleware> and how
3802 to use it to enable L<Plack::Middleware>
3804 This method is automatically called during 'setup' of your application, so
3805 you really don't need to invoke it. However you may do so if you find the idea
3806 of loading middleware via configuration weird :). For example:
3812 __PACKAGE__->setup_middleware('Head');
3815 When we read middleware definitions from configuration, we reverse the list
3816 which sounds odd but is likely how you expect it to work if you have prior
3817 experience with L<Plack::Builder> or if you previously used the plugin
3818 L<Catalyst::Plugin::EnableMiddleware> (which is now considered deprecated)
3820 So basically your middleware handles an incoming request from the first
3821 registered middleware, down and handles the response from the last middleware
3826 sub registered_middlewares {
3828 if(my $middleware = $class->_psgi_middleware) {
3829 my @mw = ($class->default_middleware, @$middleware);
3831 if($class->config->{using_frontend_proxy}) {
3832 push @mw, Plack::Middleware::ReverseProxy->new;
3837 die "You cannot call ->registered_middlewares until middleware has been setup";
3841 sub setup_middleware {
3843 my @middleware_definitions;
3845 # If someone calls this method you can add middleware with args. However if its
3846 # called without an arg we need to setup the configuration middleware.
3848 @middleware_definitions = reverse(@_);
3850 @middleware_definitions = reverse(@{$class->config->{'psgi_middleware'}||[]})
3851 unless $class->finalized_default_middleware;
3852 $class->finalized_default_middleware(1); # Only do this once, just in case some people call setup over and over...
3855 my @middleware = ();
3856 while(my $next = shift(@middleware_definitions)) {
3858 if(Scalar::Util::blessed $next && $next->can('wrap')) {
3859 push @middleware, $next;
3860 } elsif(ref $next eq 'CODE') {
3861 push @middleware, $next;
3862 } elsif(ref $next eq 'HASH') {
3863 my $namespace = shift @middleware_definitions;
3864 my $mw = $class->Catalyst::Utils::build_middleware($namespace, %$next);
3865 push @middleware, $mw;
3867 die "I can't handle middleware definition ${\ref $next}";
3870 my $mw = $class->Catalyst::Utils::build_middleware($next);
3871 push @middleware, $mw;
3875 my @existing = @{$class->_psgi_middleware || []};
3876 $class->_psgi_middleware([@middleware,@existing,]);
3879 =head2 registered_data_handlers
3881 A read only copy of registered Data Handlers returned as a Hash, where each key
3882 is a content type and each value is a subref that attempts to decode that content
3885 =head2 setup_data_handlers (?@data_handler)
3887 Read configuration information stored in configuration key C<data_handlers> or
3890 See under L</CONFIGURATION> information regarding C<data_handlers>.
3892 This method is automatically called during 'setup' of your application, so
3893 you really don't need to invoke it.
3895 =head2 default_data_handlers
3897 Default Data Handlers that come bundled with L<Catalyst>. Currently there are
3898 only two default data handlers, for 'application/json' and an alternative to
3899 'application/x-www-form-urlencoded' which supposed nested form parameters via
3900 L<CGI::Struct> or via L<CGI::Struct::XS> IF you've installed it.
3902 The 'application/json' data handler is used to parse incoming JSON into a Perl
3903 data structure. It used either L<JSON::MaybeXS> or L<JSON>, depending on which
3904 is installed. This allows you to fail back to L<JSON:PP>, which is a Pure Perl
3905 JSON decoder, and has the smallest dependency impact.
3907 Because we don't wish to add more dependencies to L<Catalyst>, if you wish to
3908 use this new feature we recommend installing L<JSON> or L<JSON::MaybeXS> in
3909 order to get the best performance. You should add either to your dependency
3910 list (Makefile.PL, dist.ini, cpanfile, etc.)
3914 sub registered_data_handlers {
3916 if(my $data_handlers = $class->_data_handlers) {
3917 return %$data_handlers;
3919 $class->setup_data_handlers;
3920 return $class->registered_data_handlers;
3924 sub setup_data_handlers {
3925 my ($class, %data_handler_callbacks) = @_;
3926 %data_handler_callbacks = (
3927 %{$class->default_data_handlers},
3928 %{$class->config->{'data_handlers'}||+{}},
3929 %data_handler_callbacks);
3931 $class->_data_handlers(\%data_handler_callbacks);
3934 sub default_data_handlers {
3937 'application/x-www-form-urlencoded' => sub {
3938 my ($fh, $req) = @_;
3939 my $params = $req->_use_hash_multivalue ? $req->body_parameters->mixed : $req->body_parameters;
3940 Class::Load::load_first_existing_class('CGI::Struct::XS', 'CGI::Struct')
3941 ->can('build_cgi_struct')->($params);
3943 'application/json' => sub {
3944 my ($fh, $req) = @_;
3945 my $parser = Class::Load::load_first_existing_class('JSON::MaybeXS', 'JSON');
3949 $slurped = $fh->getline;
3950 $parser->can("decode_json")->($slurped); # decode_json does utf8 decoding for us
3951 } || Catalyst::Exception->throw(sprintf "Error Parsing POST '%s', Error: %s", (defined($slurped) ? $slurped : 'undef') ,$@);
3956 sub _handle_http_exception {
3957 my ( $self, $error ) = @_;
3959 !$self->config->{always_catch_http_exceptions}
3962 $error->can('as_psgi')
3963 || ( $error->can('code')
3964 && $error->code =~ m/^[1-5][0-9][0-9]$/ )
3974 Returns an arrayref of the internal execution stack (actions that are
3975 currently executing).
3979 Returns the current timing statistics object. By default Catalyst uses
3980 L<Catalyst::Stats|Catalyst::Stats>, but can be set otherwise with
3981 L<< stats_class|/"$c->stats_class" >>.
3983 Even if L<< -Stats|/"-Stats" >> is not enabled, the stats object is still
3984 available. By enabling it with C< $c->stats->enabled(1) >, it can be used to
3985 profile explicitly, although MyApp.pm still won't profile nor output anything
3988 =head2 $c->stats_class
3990 Returns or sets the stats (timing statistics) class. L<Catalyst::Stats|Catalyst::Stats> is used by default.
3992 =head2 $app->stats_class_traits
3994 A arrayref of L<Moose::Role>s that are applied to the stats_class before creating it.
3996 =head2 $app->composed_stats_class
3998 this is the stats_class composed with any 'stats_class_traits'. You can
3999 name the full namespace of the role, or a namespace suffix, which will then
4000 be tried against the following standard namespace prefixes.
4002 $MyApp::TraitFor::Stats::$trait_suffix
4003 Catalyst::TraitFor::Stats::$trait_suffix
4005 So for example if you set:
4007 MyApp->stats_class_traits(['Foo']);
4009 We try each possible role in turn (and throw an error if none load)
4012 MyApp::TraitFor::Stats::Foo
4013 Catalyst::TraitFor::Stats::Foo
4015 The namespace part 'TraitFor::Stats' was choosen to assist in backwards
4016 compatibility with L<CatalystX::RoleApplicator> which previously provided
4017 these features in a stand alone package.
4019 =head2 $c->use_stats
4021 Returns 1 when L<< stats collection|/"-Stats" >> is enabled.
4023 Note that this is a static method, not an accessor and should be overridden
4024 by declaring C<sub use_stats { 1 }> in your MyApp.pm, not by calling C<< $c->use_stats(1) >>.
4031 =head2 $c->write( $data )
4033 Writes $data to the output stream. When using this method directly, you
4034 will need to manually set the C<Content-Length> header to the length of
4035 your output data, if known.
4042 # Finalize headers if someone manually writes output (for compat)
4043 $c->finalize_headers;
4045 return $c->response->write( @_ );
4050 Returns the Catalyst version number. Mostly useful for "powered by"
4051 messages in template systems.
4055 sub version { return $Catalyst::VERSION }
4057 =head1 CONFIGURATION
4059 There are a number of 'base' config variables which can be set:
4065 C<always_catch_http_exceptions> - As of version 5.90060 Catalyst
4066 rethrows errors conforming to the interface described by
4067 L<Plack::Middleware::HTTPExceptions> and lets the middleware deal with it.
4068 Set true to get the deprecated behaviour and have Catalyst catch HTTP exceptions.
4072 C<default_model> - The default model picked if you say C<< $c->model >>. See L<< /$c->model($name) >>.
4076 C<default_view> - The default view to be rendered or returned when C<< $c->view >> is called. See L<< /$c->view($name) >>.
4080 C<disable_component_resolution_regex_fallback> - Turns
4081 off the deprecated component resolution functionality so
4082 that if any of the component methods (e.g. C<< $c->controller('Foo') >>)
4083 are called then regex search will not be attempted on string values and
4084 instead C<undef> will be returned.
4088 C<home> - The application home directory. In an uninstalled application,
4089 this is the top level application directory. In an installed application,
4090 this will be the directory containing C<< MyApp.pm >>.
4094 C<ignore_frontend_proxy> - See L</PROXY SUPPORT>
4098 C<name> - The name of the application in debug messages and the debug and
4103 C<parse_on_demand> - The request body (for example file uploads) will not be parsed
4104 until it is accessed. This allows you to (for example) check authentication (and reject
4105 the upload) before actually receiving all the data. See L</ON-DEMAND PARSER>
4109 C<root> - The root directory for templates. Usually this is just a
4110 subdirectory of the home directory, but you can set it to change the
4111 templates to a different directory.
4115 C<search_extra> - Array reference passed to Module::Pluggable to for additional
4116 namespaces from which components will be loaded (and constructed and stored in
4117 C<< $c->components >>).
4121 C<show_internal_actions> - If true, causes internal actions such as C<< _DISPATCH >>
4122 to be shown in hit debug tables in the test server.
4126 C<use_request_uri_for_path> - Controls if the C<REQUEST_URI> or C<PATH_INFO> environment
4127 variable should be used for determining the request path.
4129 Most web server environments pass the requested path to the application using environment variables,
4130 from which Catalyst has to reconstruct the request base (i.e. the top level path to / in the application,
4131 exposed as C<< $c->request->base >>) and the request path below that base.
4133 There are two methods of doing this, both of which have advantages and disadvantages. Which method is used
4134 is determined by the C<< $c->config(use_request_uri_for_path) >> setting (which can either be true or false).
4138 =item use_request_uri_for_path => 0
4140 This is the default (and the) traditional method that Catalyst has used for determining the path information.
4141 The path is generated from a combination of the C<PATH_INFO> and C<SCRIPT_NAME> environment variables.
4142 The allows the application to behave correctly when C<mod_rewrite> is being used to redirect requests
4143 into the application, as these variables are adjusted by mod_rewrite to take account for the redirect.
4145 However this method has the major disadvantage that it is impossible to correctly decode some elements
4146 of the path, as RFC 3875 says: "C<< Unlike a URI path, the PATH_INFO is not URL-encoded, and cannot
4147 contain path-segment parameters. >>" This means PATH_INFO is B<always> decoded, and therefore Catalyst
4148 can't distinguish / vs %2F in paths (in addition to other encoded values).
4150 =item use_request_uri_for_path => 1
4152 This method uses the C<REQUEST_URI> and C<SCRIPT_NAME> environment variables. As C<REQUEST_URI> is never
4153 decoded, this means that applications using this mode can correctly handle URIs including the %2F character
4154 (i.e. with C<AllowEncodedSlashes> set to C<On> in Apache).
4156 Given that this method of path resolution is provably more correct, it is recommended that you use
4157 this unless you have a specific need to deploy your application in a non-standard environment, and you are
4158 aware of the implications of not being able to handle encoded URI paths correctly.
4160 However it also means that in a number of cases when the app isn't installed directly at a path, but instead
4161 is having paths rewritten into it (e.g. as a .cgi/fcgi in a public_html directory, with mod_rewrite in a
4162 .htaccess file, or when SSI is used to rewrite pages into the app, or when sub-paths of the app are exposed
4163 at other URIs than that which the app is 'normally' based at with C<mod_rewrite>), the resolution of
4164 C<< $c->request->base >> will be incorrect.
4170 C<using_frontend_proxy> - See L</PROXY SUPPORT>.
4174 C<using_frontend_proxy_path> - Enabled L<Plack::Middleware::ReverseProxyPath> on your application (if
4175 installed, otherwise log an error). This is useful if your application is not running on the
4176 'root' (or /) of your host server. B<NOTE> if you use this feature you should add the required
4177 middleware to your project dependency list since its not automatically a dependency of L<Catalyst>.
4178 This has been done since not all people need this feature and we wish to restrict the growth of
4179 L<Catalyst> dependencies.
4183 C<encoding> - See L</ENCODING>
4185 This now defaults to 'UTF-8'. You my turn it off by setting this configuration
4190 C<abort_chain_on_error_fix>
4192 When there is an error in an action chain, the default behavior is to continue
4193 processing the remaining actions and then catch the error upon chain end. This
4194 can lead to running actions when the application is in an unexpected state. If
4195 you have this issue, setting this config value to true will promptly exit a
4196 chain when there is an error raised in any action (thus terminating the chain
4201 __PACKAGE__->config(abort_chain_on_error_fix => 1);
4203 In the future this might become the default behavior.
4207 C<use_hash_multivalue_in_request>
4209 In L<Catalyst::Request> the methods C<query_parameters>, C<body_parametes>
4210 and C<parameters> return a hashref where values might be scalar or an arrayref
4211 depending on the incoming data. In many cases this can be undesirable as it
4212 leads one to writing defensive code like the following:
4214 my ($val) = ref($c->req->parameters->{a}) ?
4215 @{$c->req->parameters->{a}} :
4216 $c->req->parameters->{a};
4218 Setting this configuration item to true will make L<Catalyst> populate the
4219 attributes underlying these methods with an instance of L<Hash::MultiValue>
4220 which is used by L<Plack::Request> and others to solve this very issue. You
4221 may prefer this behavior to the default, if so enable this option (be warned
4222 if you enable it in a legacy application we are not sure if it is completely
4223 backwardly compatible).
4227 C<skip_complex_post_part_handling>
4229 When creating body parameters from a POST, if we run into a multpart POST
4230 that does not contain uploads, but instead contains inlined complex data
4231 (very uncommon) we cannot reliably convert that into field => value pairs. So
4232 instead we create an instance of L<Catalyst::Request::PartData>. If this causes
4233 issue for you, you can disable this by setting C<skip_complex_post_part_handling>
4234 to true (default is false).
4238 C<skip_body_param_unicode_decoding>
4240 Generally we decode incoming POST params based on your declared encoding (the
4241 default for this is to decode UTF-8). If this is causing you trouble and you
4242 do not wish to turn all encoding support off (with the C<encoding> configuration
4243 parameter) you may disable this step atomically by setting this configuration
4248 C<do_not_decode_query>
4250 If true, then do not try to character decode any wide characters in your
4251 request URL query or keywords. Most readings of the relevent specifications
4252 suggest these should be UTF-* encoded, which is the default that L<Catalyst>
4253 will use, hwoever if you are creating a lot of URLs manually or have external
4254 evil clients, this might cause you trouble. If you find the changes introduced
4255 in Catalyst version 5.90080+ break some of your query code, you may disable
4256 the UTF-8 decoding globally using this configuration.
4258 This setting takes precedence over C<default_query_encoding> and
4259 C<decode_query_using_global_encoding>
4263 C<default_query_encoding>
4265 By default we decode query and keywords in your request URL using UTF-8, which
4266 is our reading of the relevent specifications. This setting allows one to
4267 specify a fixed value for how to decode your query. You might need this if
4268 you are doing a lot of custom encoding of your URLs and not using UTF-8.
4270 This setting take precedence over C<decode_query_using_global_encoding>.
4274 C<decode_query_using_global_encoding>
4276 Setting this to true will default your query decoding to whatever your
4277 general global encoding is (the default is UTF-8).
4281 C<use_chained_args_0_special_case>
4283 In older versions of Catalyst, when more than one action matched the same path
4284 AND all those matching actions declared Args(0), we'd break the tie by choosing
4285 the first action defined. We now normalized how Args(0) works so that it
4286 follows the same rule as Args(N), which is to say when we need to break a tie
4287 we choose the LAST action defined. If this breaks your code and you don't
4288 have time to update to follow the new normalized approach, you may set this
4289 value to true and it will globally revert to the original chaining behavior.
4293 C<psgi_middleware> - See L<PSGI MIDDLEWARE>.
4297 C<data_handlers> - See L<DATA HANDLERS>.
4301 C<stats_class_traits>
4303 An arrayref of L<Moose::Role>s that get componsed into your stats class.
4307 C<request_class_traits>
4309 An arrayref of L<Moose::Role>s that get componsed into your request class.
4313 C<response_class_traits>
4315 An arrayref of L<Moose::Role>s that get componsed into your response class.
4319 C<inject_components>
4321 A Hashref of L<Catalyst::Component> subclasses that are 'injected' into configuration.
4325 inject_components => {
4326 'Controller::Err' => { from_component => 'Local::Controller::Errors' },
4327 'Model::Zoo' => { from_component => 'Local::Model::Foo' },
4328 'Model::Foo' => { from_component => 'Local::Model::Foo', roles => ['TestRole'] },
4330 'Controller::Err' => { a => 100, b=>200, namespace=>'error' },
4331 'Model::Zoo' => { a => 2 },
4332 'Model::Foo' => { a => 100 },
4335 Generally L<Catalyst> looks for components in your Model/View or Controller directories.
4336 However for cases when you which to use an existing component and you don't need any
4337 customization (where for when you can apply a role to customize it) you may inject those
4338 components into your application. Please note any configuration should be done 'in the
4339 normal way', with a key under configuration named after the component affix, as in the
4342 Using this type of injection allows you to construct significant amounts of your application
4343 with only configuration!. This may or may not lead to increased code understanding.
4345 Please not you may also call the ->inject_components application method as well, although
4346 you must do so BEFORE setup.
4352 Generally when you throw an exception inside an Action (or somewhere in
4353 your stack, such as in a model that an Action is calling) that exception
4354 is caught by Catalyst and unless you either catch it yourself (via eval
4355 or something like L<Try::Tiny> or by reviewing the L</error> stack, it
4356 will eventually reach L</finalize_errors> and return either the debugging
4357 error stack page, or the default error page. However, if your exception
4358 can be caught by L<Plack::Middleware::HTTPExceptions>, L<Catalyst> will
4359 instead rethrow it so that it can be handled by that middleware (which
4360 is part of the default middleware). For example this would allow
4362 use HTTP::Throwable::Factory 'http_throw';
4364 sub throws_exception :Local {
4365 my ($self, $c) = @_;
4367 http_throw(SeeOther => { location =>
4368 $c->uri_for($self->action_for('redirect')) });
4372 =head1 INTERNAL ACTIONS
4374 Catalyst uses internal actions like C<_DISPATCH>, C<_BEGIN>, C<_AUTO>,
4375 C<_ACTION>, and C<_END>. These are by default not shown in the private
4376 action table, but you can make them visible with a config parameter.
4378 MyApp->config(show_internal_actions => 1);
4380 =head1 ON-DEMAND PARSER
4382 The request body is usually parsed at the beginning of a request,
4383 but if you want to handle input yourself, you can enable on-demand
4384 parsing with a config parameter.
4386 MyApp->config(parse_on_demand => 1);
4388 =head1 PROXY SUPPORT
4390 Many production servers operate using the common double-server approach,
4391 with a lightweight frontend web server passing requests to a larger
4392 backend server. An application running on the backend server must deal
4393 with two problems: the remote user always appears to be C<127.0.0.1> and
4394 the server's hostname will appear to be C<localhost> regardless of the
4395 virtual host that the user connected through.
4397 Catalyst will automatically detect this situation when you are running
4398 the frontend and backend servers on the same machine. The following
4399 changes are made to the request.
4401 $c->req->address is set to the user's real IP address, as read from
4402 the HTTP X-Forwarded-For header.
4404 The host value for $c->req->base and $c->req->uri is set to the real
4405 host, as read from the HTTP X-Forwarded-Host header.
4407 Additionally, you may be running your backend application on an insecure
4408 connection (port 80) while your frontend proxy is running under SSL. If there
4409 is a discrepancy in the ports, use the HTTP header C<X-Forwarded-Port> to
4410 tell Catalyst what port the frontend listens on. This will allow all URIs to
4411 be created properly.
4413 In the case of passing in:
4415 X-Forwarded-Port: 443
4417 All calls to C<uri_for> will result in an https link, as is expected.
4419 Obviously, your web server must support these headers for this to work.
4421 In a more complex server farm environment where you may have your
4422 frontend proxy server(s) on different machines, you will need to set a
4423 configuration option to tell Catalyst to read the proxied data from the
4426 MyApp->config(using_frontend_proxy => 1);
4428 If you do not wish to use the proxy support at all, you may set:
4430 MyApp->config(ignore_frontend_proxy => 0);
4432 =head2 Note about psgi files
4434 Note that if you supply your own .psgi file, calling
4435 C<< MyApp->psgi_app(@_); >>, then B<this will not happen automatically>.
4437 You either need to apply L<Plack::Middleware::ReverseProxy> yourself
4438 in your psgi, for example:
4441 enable "Plack::Middleware::ReverseProxy";
4445 This will unconditionally add the ReverseProxy support, or you need to call
4446 C<< $app = MyApp->apply_default_middlewares($app) >> (to conditionally
4447 apply the support depending upon your config).
4449 See L<Catalyst::PSGI> for more information.
4451 =head1 THREAD SAFETY
4453 Catalyst has been tested under Apache 2's threading C<mpm_worker>,
4454 C<mpm_winnt>, and the standalone forking HTTP server on Windows. We
4455 believe the Catalyst core to be thread-safe.
4457 If you plan to operate in a threaded environment, remember that all other
4458 modules you are using must also be thread-safe. Some modules, most notably
4459 L<DBD::SQLite>, are not thread-safe.
4461 =head1 DATA HANDLERS
4463 The L<Catalyst::Request> object uses L<HTTP::Body> to populate 'classic' HTML
4464 form parameters and URL search query fields. However it has become common
4465 for various alternative content types to be PUT or POSTed to your controllers
4466 and actions. People working on RESTful APIs, or using AJAX often use JSON,
4467 XML and other content types when communicating with an application server. In
4468 order to better support this use case, L<Catalyst> defines a global configuration
4469 option, C<data_handlers>, which lets you associate a content type with a coderef
4470 that parses that content type into something Perl can readily access.
4477 __PACKAGE__->config(
4479 'application/json' => sub { local $/; decode_json $_->getline },
4481 ## Any other configuration.
4486 By default L<Catalyst> comes with a generic JSON data handler similar to the
4487 example given above, which uses L<JSON::Maybe> to provide either L<JSON::PP>
4488 (a pure Perl, dependency free JSON parser) or L<Cpanel::JSON::XS> if you have
4489 it installed (if you want the faster XS parser, add it to you project Makefile.PL
4490 or dist.ini, cpanfile, etc.)
4492 The C<data_handlers> configuration is a hashref whose keys are HTTP Content-Types
4493 (matched against the incoming request type using a regexp such as to be case
4494 insensitive) and whose values are coderefs that receive a localized version of
4495 C<$_> which is a filehandle object pointing to received body.
4497 This feature is considered an early access release and we reserve the right
4498 to alter the interface in order to provide a performant and secure solution to
4499 alternative request body content. Your reports welcomed!
4501 =head1 PSGI MIDDLEWARE
4503 You can define middleware, defined as L<Plack::Middleware> or a compatible
4504 interface in configuration. Your middleware definitions are in the form of an
4505 arrayref under the configuration key C<psgi_middleware>. Here's an example
4506 with details to follow:
4511 use Plack::Middleware::StackTrace;
4513 my $stacktrace_middleware = Plack::Middleware::StackTrace->new;
4515 __PACKAGE__->config(
4516 'psgi_middleware', [
4519 $stacktrace_middleware,
4520 'Session' => {store => 'File'},
4525 $env->{myapp.customkey} = 'helloworld';
4534 So the general form is:
4536 __PACKAGE__->config(psgi_middleware => \@middleware_definitions);
4538 Where C<@middleware> is one or more of the following, applied in the REVERSE of
4539 the order listed (to make it function similarly to L<Plack::Builder>:
4541 Alternatively, you may also define middleware by calling the L</setup_middleware>
4548 __PACKAGE__->setup_middleware( \@middleware_definitions);
4551 In the case where you do both (use 'setup_middleware' and configuration) the
4552 package call to setup_middleware will be applied earlier (in other words its
4553 middleware will wrap closer to the application). Keep this in mind since in
4554 some cases the order of middleware is important.
4556 The two approaches are not exclusive.
4560 =item Middleware Object
4562 An already initialized object that conforms to the L<Plack::Middleware>
4565 my $stacktrace_middleware = Plack::Middleware::StackTrace->new;
4567 __PACKAGE__->config(
4568 'psgi_middleware', [
4569 $stacktrace_middleware,
4575 A coderef that is an inlined middleware:
4577 __PACKAGE__->config(
4578 'psgi_middleware', [
4583 if($env->{PATH_INFO} =~m/forced/) {
4585 ->new(file=>TestApp->path_to(qw/share static forced.txt/))
4588 return $app->($env);
4598 We assume the scalar refers to a namespace after normalizing it using the
4601 (1) If the scalar is prefixed with a "+" (as in C<+MyApp::Foo>) then the full string
4602 is assumed to be 'as is', and we just install and use the middleware.
4604 (2) If the scalar begins with "Plack::Middleware" or your application namespace
4605 (the package name of your Catalyst application subclass), we also assume then
4606 that it is a full namespace, and use it.
4608 (3) Lastly, we then assume that the scalar is a partial namespace, and attempt to
4609 resolve it first by looking for it under your application namespace (for example
4610 if you application is "MyApp::Web" and the scalar is "MyMiddleware", we'd look
4611 under "MyApp::Web::Middleware::MyMiddleware") and if we don't find it there, we
4612 will then look under the regular L<Plack::Middleware> namespace (i.e. for the
4613 previous we'd try "Plack::Middleware::MyMiddleware"). We look under your application
4614 namespace first to let you 'override' common L<Plack::Middleware> locally, should
4615 you find that a good idea.
4621 __PACKAGE__->config(
4622 'psgi_middleware', [
4623 'Debug', ## MyAppWeb::Middleware::Debug->wrap or Plack::Middleware::Debug->wrap
4624 'Plack::Middleware::Stacktrace', ## Plack::Middleware::Stacktrace->wrap
4625 '+MyApp::Custom', ## MyApp::Custom->wrap
4629 =item a scalar followed by a hashref
4631 Just like the previous, except the following C<HashRef> is used as arguments
4632 to initialize the middleware object.
4634 __PACKAGE__->config(
4635 'psgi_middleware', [
4636 'Session' => {store => 'File'},
4641 Please see L<PSGI> for more on middleware.
4645 Starting in L<Catalyst> version 5.90080 encoding is automatically enabled
4646 and set to encode all body responses to UTF8 when possible and applicable.
4647 Following is documentation on this process. If you are using an older
4648 version of L<Catalyst> you should review documentation for that version since
4651 By default encoding is now 'UTF-8'. You may turn it off by setting
4652 the encoding configuration to undef.
4654 MyApp->config(encoding => undef);
4656 This is recommended for temporary backwards compatibility only.
4658 Encoding is automatically applied when the content-type is set to
4659 a type that can be encoded. Currently we encode when the content type
4660 matches the following regular expression:
4662 $content_type =~ /^text|xml$|javascript$/
4664 Encoding is set on the application, but it is copied to the context object
4665 so that you can override it on a request basis.
4667 Be default we don't automatically encode 'application/json' since the most
4668 common approaches to generating this type of response (Either via L<Catalyst::View::JSON>
4669 or L<Catalyst::Action::REST>) will do so already and we want to avoid double
4672 If you are producing JSON response in an unconventional manner (such
4673 as via a template or manual strings) you should perform the UTF8 encoding
4674 manually as well such as to conform to the JSON specification.
4676 NOTE: We also examine the value of $c->response->content_encoding. If
4677 you set this (like for example 'gzip', and manually gzipping the body)
4678 we assume that you have done all the necessary encoding yourself, since
4679 we cannot encode the gzipped contents. If you use a plugin like
4680 L<Catalyst::Plugin::Compress> you need to update to a modern version in order
4681 to have this function correctly with the new UTF8 encoding code, or you
4682 can use L<Plack::Middleware::Deflater> or (probably best) do your compression on
4691 Returns an instance of an C<Encode> encoding
4693 print $c->encoding->name
4695 =item handle_unicode_encoding_exception ($exception_context)
4697 Method called when decoding process for a request fails.
4699 An C<$exception_context> hashref is provided to allow you to override the
4700 behaviour of your application when given data with incorrect encodings.
4702 The default method throws exceptions in the case of invalid request parameters
4703 (resulting in a 500 error), but ignores errors in upload filenames.
4705 The keys passed in the C<$exception_context> hash are:
4711 The value which was not able to be decoded.
4715 The exception received from L<Encode>.
4719 What type of data was being decoded. Valid values are (currently)
4720 C<params> - for request parameters / arguments / captures
4721 and C<uploads> - for request upload filenames.
4731 Join #catalyst on irc.perl.org.
4735 http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/catalyst
4736 http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/catalyst-dev
4740 http://catalyst.perl.org
4744 http://dev.catalyst.perl.org
4748 =head2 L<Task::Catalyst> - All you need to start with Catalyst
4750 =head2 L<Catalyst::Manual> - The Catalyst Manual
4752 =head2 L<Catalyst::Component>, L<Catalyst::Controller> - Base classes for components
4754 =head2 L<Catalyst::Engine> - Core engine
4756 =head2 L<Catalyst::Log> - Log class.
4758 =head2 L<Catalyst::Request> - Request object
4760 =head2 L<Catalyst::Response> - Response object
4762 =head2 L<Catalyst::Test> - The test suite.
4764 =head1 PROJECT FOUNDER
4766 sri: Sebastian Riedel <sri@cpan.org>
4772 acme: Leon Brocard <leon@astray.com>
4774 abraxxa: Alexander Hartmaier <abraxxa@cpan.org>
4776 andrewalker: André Walker <andre@cpan.org>
4780 Andrew Ford E<lt>A.Ford@ford-mason.co.ukE<gt>
4784 andyg: Andy Grundman <andy@hybridized.org>
4786 audreyt: Audrey Tang
4788 bricas: Brian Cassidy <bricas@cpan.org>
4790 Caelum: Rafael Kitover <rkitover@io.com>
4792 chansen: Christian Hansen
4794 chicks: Christopher Hicks
4796 Chisel Wright C<pause@herlpacker.co.uk>
4798 Danijel Milicevic C<me@danijel.de>
4800 davewood: David Schmidt <davewood@cpan.org>
4802 David Kamholz E<lt>dkamholz@cpan.orgE<gt>
4804 David Naughton, C<naughton@umn.edu>
4808 dhoss: Devin Austin <dhoss@cpan.org>
4810 dkubb: Dan Kubb <dan.kubb-cpan@onautopilot.com>
4814 dwc: Daniel Westermann-Clark <danieltwc@cpan.org>
4816 esskar: Sascha Kiefer
4818 fireartist: Carl Franks <cfranks@cpan.org>
4820 frew: Arthur Axel "fREW" Schmidt <frioux@gmail.com>
4822 gabb: Danijel Milicevic
4826 Gavin Henry C<ghenry@perl.me.uk>
4830 groditi: Guillermo Roditi <groditi@gmail.com>
4832 hobbs: Andrew Rodland <andrew@cleverdomain.org>
4834 ilmari: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
4836 jcamacho: Juan Camacho
4838 jester: Jesse Sheidlower C<jester@panix.com>
4840 jhannah: Jay Hannah <jay@jays.net>
4846 jon: Jon Schutz <jjschutz@cpan.org>
4848 Jonathan Rockway C<< <jrockway@cpan.org> >>
4850 Kieren Diment C<kd@totaldatasolution.com>
4852 konobi: Scott McWhirter <konobi@cpan.org>
4854 marcus: Marcus Ramberg <mramberg@cpan.org>
4856 miyagawa: Tatsuhiko Miyagawa <miyagawa@bulknews.net>
4858 mgrimes: Mark Grimes <mgrimes@cpan.org>
4860 mst: Matt S. Trout <mst@shadowcatsystems.co.uk>
4864 naughton: David Naughton
4866 ningu: David Kamholz <dkamholz@cpan.org>
4868 nothingmuch: Yuval Kogman <nothingmuch@woobling.org>
4870 numa: Dan Sully <daniel@cpan.org>
4876 omega: Andreas Marienborg
4878 Oleg Kostyuk <cub.uanic@gmail.com>
4880 phaylon: Robert Sedlacek <phaylon@dunkelheit.at>
4882 rafl: Florian Ragwitz <rafl@debian.org>
4884 random: Roland Lammel <lammel@cpan.org>
4886 Robert Sedlacek C<< <rs@474.at> >>
4888 SpiceMan: Marcel Montes
4892 szbalint: Balint Szilakszi <szbalint@cpan.org>
4894 t0m: Tomas Doran <bobtfish@bobtfish.net>
4898 vanstyn: Henry Van Styn <vanstyn@cpan.org>
4900 Viljo Marrandi C<vilts@yahoo.com>
4902 Will Hawes C<info@whawes.co.uk>
4904 willert: Sebastian Willert <willert@cpan.org>
4906 wreis: Wallace Reis <wreis@cpan.org>
4908 Yuval Kogman, C<nothingmuch@woobling.org>
4910 rainboxx: Matthias Dietrich, C<perl@rainboxx.de>
4912 dd070: Dhaval Dhanani <dhaval070@gmail.com>
4914 Upasana <me@upasana.me>
4916 John Napiorkowski (jnap) <jjnapiork@cpan.org>
4920 Copyright (c) 2005-2015, the above named PROJECT FOUNDER and CONTRIBUTORS.
4924 This library is free software. You can redistribute it and/or modify it under
4925 the same terms as Perl itself.
4931 __PACKAGE__->meta->make_immutable;