1 package Catalyst::Dispatcher;
5 with 'MooseX::Emulate::Class::Accessor::Fast';
7 use Catalyst::Exception;
10 use Catalyst::ActionContainer;
11 use Catalyst::DispatchType::Default;
12 use Catalyst::DispatchType::Index;
14 use Text::SimpleTable;
16 use Tree::Simple::Visitor::FindByPath;
18 use namespace::clean -except => 'meta';
21 # do these belong as package vars or should we build these via a builder method?
22 # See Catalyst-Plugin-Server for them being added to, which should be much less ugly.
24 # Preload these action types
25 our @PRELOAD = qw/Index Path Regex/;
27 # Postload these action types
28 our @POSTLOAD = qw/Default/;
30 # Note - see back-compat methods at end of file.
31 has _tree => (is => 'rw', builder => '_build__tree');
32 has dispatch_types => (is => 'rw', default => sub { [] }, required => 1, lazy => 1);
33 has _registered_dispatch_types => (is => 'rw', default => sub { {} }, required => 1, lazy => 1);
34 has _method_action_class => (is => 'rw', default => 'Catalyst::Action');
35 has _action_hash => (is => 'rw', required => 1, lazy => 1, default => sub { {} });
36 has _container_hash => (is => 'rw', required => 1, lazy => 1, default => sub { {} });
38 my %dispatch_types = ( pre => \@PRELOAD, post => \@POSTLOAD );
39 foreach my $type (keys %dispatch_types) {
40 has $type . "load_dispatch_types" => (
41 is => 'rw', required => 1, lazy => 1, default => sub { $dispatch_types{$type} },
42 traits => ['MooseX::Emulate::Class::Accessor::Fast::Meta::Role::Attribute'], # List assignment is CAF style
48 Catalyst::Dispatcher - The Catalyst Dispatcher
56 This is the class that maps public urls to actions in your Catalyst
57 application based on the attributes you set.
63 Construct a new dispatcher.
71 Catalyst::ActionContainer->new( { part => '/', actions => {} } );
73 return Tree::Simple->new($container, Tree::Simple->ROOT);
76 =head2 $self->preload_dispatch_types
78 An arrayref of pre-loaded dispatchtype classes
80 Entries are considered to be available as C<Catalyst::DispatchType::CLASS>
81 To use a custom class outside the regular C<Catalyst> namespace, prefix
82 it with a C<+>, like so:
86 =head2 $self->postload_dispatch_types
88 An arrayref of post-loaded dispatchtype classes
90 Entries are considered to be available as C<Catalyst::DispatchType::CLASS>
91 To use a custom class outside the regular C<Catalyst> namespace, prefix
92 it with a C<+>, like so:
96 =head2 $self->dispatch($c)
98 Delegate the dispatch to the action that matched the url, or return a
99 message about unknown resource
104 my ( $self, $c ) = @_;
105 if ( my $action = $c->action ) {
106 $c->forward( join( '/', '', $action->namespace, '_DISPATCH' ) );
109 my $path = $c->req->path;
111 ? qq/Unknown resource "$path"/
112 : "No default action defined";
113 $c->log->error($error) if $c->debug;
118 # $self->_command2action( $c, $command [, \@arguments ] )
119 # $self->_command2action( $c, $command [, \@captures, \@arguments ] )
120 # Search for an action, from the command and returns C<($action, $args, $captures)> on
121 # success. Returns C<(0)> on error.
123 sub _command2action {
124 my ( $self, $c, $command, @extra_params ) = @_;
126 $c->log->debug('Nothing to go to') if $c->debug;
130 my (@args, @captures);
132 if ( ref( $extra_params[-2] ) eq 'ARRAY' ) {
133 @captures = @{ splice @extra_params, -2, 1 };
136 if ( ref( $extra_params[-1] ) eq 'ARRAY' ) {
137 @args = @{ pop @extra_params }
139 # this is a copy, it may take some abuse from
140 # ->_invoke_as_path if the path had trailing parts
141 @args = @{ $c->request->arguments };
145 # go to a string path ("/foo/bar/gorch")
147 if (blessed($command) && $command->isa('Catalyst::Action')) {
151 $action = $self->_invoke_as_path( $c, "$command", \@args );
153 # go to a component ( "MyApp::*::Foo" or $c->component("...")
154 # - a path or an object)
156 my $method = @extra_params ? $extra_params[0] : "process";
157 $action = $self->_invoke_as_component( $c, $command, $method );
160 return $action, \@args, \@captures;
163 =head2 $self->visit( $c, $command [, \@arguments ] )
165 Documented in L<Catalyst>
171 $self->_do_visit('visit', @_);
177 my ( $c, $command ) = @_;
178 my ( $action, $args, $captures ) = $self->_command2action(@_);
179 my $error = qq/Couldn't $opname("$command"): /;
182 $error .= qq/Couldn't $opname to command "$command": /
183 .qq/Invalid action or component./;
185 elsif (!defined $action->namespace) {
186 $error .= qq/Action has no namespace: cannot $opname() to a plain /
187 .qq/method or component, must be an :Action of some sort./
189 elsif (!$action->class->can('_DISPATCH')) {
190 $error .= qq/Action cannot _DISPATCH. /
191 .qq/Did you try to $opname() a non-controller action?/;
199 $c->log->debug($error) if $c->debug;
203 $action = $self->expand_action($action);
205 local $c->request->{arguments} = $args;
206 local $c->request->{captures} = $captures;
207 local $c->{namespace} = $action->{'namespace'};
208 local $c->{action} = $action;
212 =head2 $self->go( $c, $command [, \@arguments ] )
214 Documented in L<Catalyst>
220 $self->_do_visit('go', @_);
221 Catalyst::Exception::Go->throw;
224 =head2 $self->forward( $c, $command [, \@arguments ] )
226 Documented in L<Catalyst>
232 no warnings 'recursion';
233 $self->_do_forward(forward => @_);
239 my ( $c, $command ) = @_;
240 my ( $action, $args, $captures ) = $self->_command2action(@_);
243 my $error .= qq/Couldn't $opname to command "$command": /
244 .qq/Invalid action or component./;
246 $c->log->debug($error) if $c->debug;
251 local $c->request->{arguments} = $args;
252 no warnings 'recursion';
253 $action->dispatch( $c );
258 =head2 $self->detach( $c, $command [, \@arguments ] )
260 Documented in L<Catalyst>
265 my ( $self, $c, $command, @args ) = @_;
266 $self->_do_forward(detach => $c, $command, @args ) if $command;
267 Catalyst::Exception::Detach->throw;
270 sub _action_rel2abs {
271 my ( $self, $c, $path ) = @_;
273 unless ( $path =~ m#^/# ) {
274 my $namespace = $c->stack->[-1]->namespace;
275 $path = "$namespace/$path";
282 sub _invoke_as_path {
283 my ( $self, $c, $rel_path, $args ) = @_;
284 my $path = $self->_action_rel2abs( $c, $rel_path );
285 my ( $tail, @extra_args );
286 while ( ( $path, $tail ) = ( $path =~ m#^(?:(.*)/)?(\w+)?$# ) )
287 { # allow $path to be empty
288 if ( my $action = $c->get_action( $tail, $path ) ) {
289 push @$args, @extra_args;
295 ; # if a match on the global namespace failed then the whole lookup failed
298 unshift @extra_args, $tail;
302 sub _find_component {
303 my ( $self, $c, $component ) = @_;
305 return blessed($component)
307 : $c->component($component);
310 sub _invoke_as_component {
311 my ( $self, $c, $component_or_class, $method ) = @_;
312 if( $component_or_class eq blessed($c->application) ){
313 my $possible_action = $c->application->action_for($method);
314 return $possible_action if $possible_action;
315 if( my $code = $c->application->can($method) ){
316 return $self->_method_action_class->new(
320 reverse => "$component_or_class->$method",
321 class => $component_or_class,
322 namespace => Catalyst::Utils::class2prefix(
329 my $component = $self->_find_component($c, $component_or_class);
330 my $component_class = blessed $component || return 0;
331 if (my $code = $component_class->can('action_for')) {
332 my $possible_action = $component->$code($method);
333 return $possible_action if $possible_action;
335 if ( my $code = $component_class->can($method) ) {
336 return $self->_method_action_class->new(
340 reverse => "$component_class->$method",
341 class => $component_class,
342 namespace => Catalyst::Utils::class2prefix(
350 qq/Couldn't forward to "$component_class". Does not implement "$method"/;
352 $c->log->debug($error)
358 =head2 $self->prepare_action($c)
360 Find an dispatch type that matches $c->req->path, and set args from it.
365 my ( $self, $c ) = @_;
367 my $path = $req->path;
368 my @path = split /\//, $req->path;
369 $req->args( \my @args );
371 unshift( @path, '' ); # Root action
373 DESCEND: while (@path) {
374 $path = join '/', @path;
377 # Check out dispatch types to see if any will handle the path at
380 foreach my $type ( @{ $self->dispatch_types } ) {
381 last DESCEND if $type->match( $c, $path );
384 # If not, move the last part path to args
385 my $arg = pop(@path);
386 $arg =~ s/%([0-9A-Fa-f]{2})/chr(hex($1))/eg;
390 s/%([0-9A-Fa-f]{2})/chr(hex($1))/eg for grep { defined } @{$req->captures||[]};
392 $c->log->debug( 'Path is "' . $req->match . '"' )
393 if ( $c->debug && defined $req->match && length $req->match );
395 $c->log->debug( 'Arguments are "' . join( '/', @args ) . '"' )
396 if ( $c->debug && @args );
399 =head2 $self->get_action( $action, $namespace )
401 returns a named action from a given namespace.
406 my ( $self, $name, $namespace ) = @_;
409 $namespace = join( "/", grep { length } split '/', ( defined $namespace ? $namespace : "" ) );
411 return $self->_action_hash->{"${namespace}/${name}"};
414 =head2 $self->get_action_by_path( $path );
416 Returns the named action by its full private path.
420 sub get_action_by_path {
421 my ( $self, $path ) = @_;
423 $path = "/$path" unless $path =~ /\//;
424 $self->_action_hash->{$path};
427 =head2 $self->get_actions( $c, $action, $namespace )
432 my ( $self, $c, $action, $namespace ) = @_;
433 return [] unless $action;
435 $namespace = join( "/", grep { length } split '/', $namespace || "" );
437 my @match = $self->get_containers($namespace);
439 return map { $_->get_action($action) } @match;
442 =head2 $self->get_containers( $namespace )
444 Return all the action containers for a given namespace, inclusive
449 my ( $self, $namespace ) = @_;
451 $namespace = '' if $namespace eq '/';
455 if ( length $namespace ) {
457 push @containers, $self->_container_hash->{$namespace};
458 } while ( $namespace =~ s#/[^/]+$## );
461 return reverse grep { defined } @containers, $self->_container_hash->{''};
464 =head2 $self->uri_for_action($action, \@captures)
466 Takes a Catalyst::Action object and action parameters and returns a URI
467 part such that if $c->req->path were this URI part, this action would be
468 dispatched to with $c->req->captures set to the supplied arrayref.
470 If the action object is not available for external dispatch or the dispatcher
471 cannot determine an appropriate URI, this method will return undef.
476 my ( $self, $action, $captures) = @_;
478 foreach my $dispatch_type ( @{ $self->dispatch_types } ) {
479 my $uri = $dispatch_type->uri_for_action( $action, $captures );
480 return( $uri eq '' ? '/' : $uri )
488 expand an action into a full representation of the dispatch.
489 mostly useful for chained, other actions will just return a
495 my ($self, $action) = @_;
497 foreach my $dispatch_type (@{ $self->dispatch_types }) {
498 my $expanded = $dispatch_type->expand_action($action);
499 return $expanded if $expanded;
505 =head2 $self->register( $c, $action )
507 Make sure all required dispatch types for this action are loaded, then
508 pass the action to our dispatch types so they can register it if required.
509 Also, set up the tree with the action containers.
514 my ( $self, $c, $action ) = @_;
516 my $registered = $self->_registered_dispatch_types;
518 #my $priv = 0; #seems to be unused
519 foreach my $key ( keys %{ $action->attributes } ) {
520 next if $key eq 'Private';
521 my $class = "Catalyst::DispatchType::$key";
522 unless ( $registered->{$class} ) {
523 # FIXME - Some error checking and re-throwing needed here, as
524 # we eat exceptions loading dispatch types.
525 eval { Class::MOP::load_class($class) };
526 push( @{ $self->dispatch_types }, $class->new ) unless $@;
527 $registered->{$class} = 1;
531 my @dtypes = @{ $self->dispatch_types };
533 my @low_precedence_dtypes;
535 for my $type ( @dtypes ) {
536 if ($type->_is_low_precedence) {
537 push @low_precedence_dtypes, $type;
539 push @normal_dtypes, $type;
543 # Pass the action to our dispatch types so they can register it if reqd.
544 my $was_registered = 0;
545 foreach my $type ( @normal_dtypes ) {
546 $was_registered = 1 if $type->register( $c, $action );
549 if (not $was_registered) {
550 foreach my $type ( @low_precedence_dtypes ) {
551 $type->register( $c, $action );
555 my $namespace = $action->namespace;
556 my $name = $action->name;
558 my $container = $self->_find_or_create_action_container($namespace);
560 # Set the method value
561 $container->add_action($action);
563 $self->_action_hash->{"$namespace/$name"} = $action;
564 $self->_container_hash->{$namespace} = $container;
567 sub _find_or_create_action_container {
568 my ( $self, $namespace ) = @_;
570 my $tree ||= $self->_tree;
572 return $tree->getNodeValue unless $namespace;
574 my @namespace = split '/', $namespace;
575 return $self->_find_or_create_namespace_node( $tree, @namespace )
579 sub _find_or_create_namespace_node {
580 my ( $self, $parent, $part, @namespace ) = @_;
582 return $parent unless $part;
585 ( grep { $_->getNodeValue->part eq $part } $parent->getAllChildren )[0];
588 my $container = Catalyst::ActionContainer->new($part);
589 $parent->addChild( $child = Tree::Simple->new($container) );
592 $self->_find_or_create_namespace_node( $child, @namespace );
595 =head2 $self->setup_actions( $class, $context )
597 Loads all of the preload dispatch types, registers their actions and then
598 loads all of the postload dispatch types, and iterates over the tree of
599 actions, displaying the debug information if appropriate.
604 my ( $self, $c ) = @_;
607 $self->_load_dispatch_types( @{ $self->preload_dispatch_types } );
608 @{ $self->_registered_dispatch_types }{@classes} = (1) x @classes;
610 foreach my $comp ( values %{ $c->components } ) {
611 $comp->register_actions($c) if $comp->can('register_actions');
614 $self->_load_dispatch_types( @{ $self->postload_dispatch_types } );
616 return unless $c->debug;
617 $self->_display_action_tables($c);
620 sub _display_action_tables {
623 my $avail_width = Catalyst::Utils::term_width() - 12;
624 my $col1_width = ($avail_width * .25) < 20 ? 20 : int($avail_width * .25);
625 my $col2_width = ($avail_width * .50) < 36 ? 36 : int($avail_width * .50);
626 my $col3_width = $avail_width - $col1_width - $col2_width;
627 my $privates = Text::SimpleTable->new(
628 [ $col1_width, 'Private' ], [ $col2_width, 'Class' ], [ $col3_width, 'Method' ]
633 my ( $walker, $parent, $prefix ) = @_;
634 $prefix .= $parent->getNodeValue || '';
635 $prefix .= '/' unless $prefix =~ /\/$/;
636 my $node = $parent->getNodeValue->actions;
638 for my $action ( keys %{$node} ) {
639 my $action_obj = $node->{$action};
641 if ( ( $action =~ /^_.*/ )
642 && ( !$c->config->{show_internal_actions} ) );
643 $privates->row( "$prefix$action", $action_obj->class, $action );
647 $walker->( $walker, $_, $prefix ) for $parent->getAllChildren;
650 $walker->( $walker, $self->_tree, '' );
651 $c->log->debug( "Loaded Private actions:\n" . $privates->draw . "\n" )
654 # List all public actions
655 $_->list($c) for @{ $self->dispatch_types };
658 sub _load_dispatch_types {
659 my ( $self, @types ) = @_;
662 # Preload action types
663 for my $type (@types) {
664 # first param is undef because we cannot get the appclass
665 my $class = Catalyst::Utils::resolve_namespace(undef, 'Catalyst::DispatchType', $type);
667 eval { Class::MOP::load_class($class) };
668 Catalyst::Exception->throw( message => qq/Couldn't load "$class"/ )
670 push @{ $self->dispatch_types }, $class->new;
672 push @loaded, $class;
678 =head2 $self->dispatch_type( $type )
680 Get the DispatchType object of the relevant type, i.e. passing C<$type> of
681 C<Chained> would return a L<Catalyst::DispatchType::Chained> object (assuming
682 of course it's being used.)
687 my ($self, $name) = @_;
689 # first param is undef because we cannot get the appclass
690 $name = Catalyst::Utils::resolve_namespace(undef, 'Catalyst::DispatchType', $name);
692 for (@{ $self->dispatch_types }) {
693 return $_ if ref($_) eq $name;
700 # 5.70 backwards compatibility hacks.
702 # Various plugins (e.g. Plugin::Server and Plugin::Authorization::ACL)
703 # need the methods here which *should* be private..
705 # You should be able to use get_actions or get_containers appropriately
706 # instead of relying on these methods which expose implementation details
707 # of the dispatcher..
709 # IRC backlog included below, please come ask if this doesn't work for you.
711 # <@t0m> 5.80, the state of. There are things in the dispatcher which have
712 # been deprecated, that we yell at anyone for using, which there isn't
713 # a good alternative for yet..
714 # <@mst> er, get_actions/get_containers provides that doesn't it?
715 # <@mst> DispatchTypes are loaded on demand anyway
716 # <@t0m> I'm thinking of things like _tree which is aliased to 'tree' with
717 # warnings otherwise shit breaks.. We're issuing warnings about the
718 # correct set of things which you shouldn't be calling..
720 # <@mst> basically, I don't see there's a need for a replacement for anything
721 # <@mst> it was never a good idea to call ->tree
722 # <@mst> nothingmuch was the only one who did AFAIK
723 # <@mst> and he admitted it was a hack ;)
725 # See also t/lib/TestApp/Plugin/AddDispatchTypes.pm
727 # Alias _method_name to method_name, add a before modifier to warn..
728 foreach my $public_method_name (qw/
730 registered_dispatch_types
735 my $private_method_name = '_' . $public_method_name;
736 my $meta = __PACKAGE__->meta; # Calling meta method here fine as we happen at compile time.
737 $meta->add_method($public_method_name, $meta->get_method($private_method_name));
739 my %package_hash; # Only warn once per method, per package. These are infrequent enough that
740 # I haven't provided a way to disable them, patches welcome.
741 $meta->add_before_method_modifier($public_method_name, sub {
742 my $class = caller(2);
744 $package_hash{$class}++ || do {
745 warn("Class $class is calling the deprecated method\n"
746 . " Catalyst::Dispatcher::$public_method_name,\n"
747 . " this will be removed in Catalyst 5.9X\n");
752 # End 5.70 backwards compatibility hacks.
754 __PACKAGE__->meta->make_immutable;
762 Catalyst Contributors, see Catalyst.pm
766 This library is free software. You can redistribute it and/or modify it under
767 the same terms as Perl itself.