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 ) = @_;
127 $c->log->debug('Nothing to go to') if $c->debug;
131 my (@args, @captures);
133 if ( ref( $extra_params[-2] ) eq 'ARRAY' ) {
134 @captures = @{ splice @extra_params, -2, 1 };
137 if ( ref( $extra_params[-1] ) eq 'ARRAY' ) {
138 @args = @{ pop @extra_params }
140 # this is a copy, it may take some abuse from
141 # ->_invoke_as_path if the path had trailing parts
142 @args = @{ $c->request->arguments };
147 # go to a string path ("/foo/bar/gorch")
149 if (blessed($command) && $command->isa('Catalyst::Action')) {
153 $action = $self->_invoke_as_path( $c, "$command", \@args );
156 # go to a component ( "MyApp::*::Foo" or $c->component("...")
157 # - a path or an object)
159 my $method = @extra_params ? $extra_params[0] : "process";
160 $action = $self->_invoke_as_component( $c, $command, $method );
163 return $action, \@args, \@captures;
166 =head2 $self->visit( $c, $command [, \@arguments ] )
168 Documented in L<Catalyst>
174 $self->_do_visit('visit', @_);
180 my ( $c, $command ) = @_;
181 my ( $action, $args, $captures ) = $self->_command2action(@_);
182 my $error = qq/Couldn't $opname("$command"): /;
185 $error .= qq/Couldn't $opname to command "$command": /
186 .qq/Invalid action or component./;
188 elsif (!defined $action->namespace) {
189 $error .= qq/Action has no namespace: cannot $opname() to a plain /
190 .qq/method or component, must be an :Action of some sort./
192 elsif (!$action->class->can('_DISPATCH')) {
193 $error .= qq/Action cannot _DISPATCH. /
194 .qq/Did you try to $opname() a non-controller action?/;
202 $c->log->debug($error) if $c->debug;
206 $action = $self->expand_action($action);
208 local $c->request->{arguments} = $args;
209 local $c->request->{captures} = $captures;
210 local $c->{namespace} = $action->{'namespace'};
211 local $c->{action} = $action;
216 =head2 $self->go( $c, $command [, \@arguments ] )
218 Documented in L<Catalyst>
224 $self->_do_visit('go', @_);
225 Catalyst::Exception::Go->throw;
228 =head2 $self->forward( $c, $command [, \@arguments ] )
230 Documented in L<Catalyst>
236 no warnings 'recursion';
237 $self->_do_forward(forward => @_);
243 my ( $c, $command ) = @_;
244 my ( $action, $args, $captures ) = $self->_command2action(@_);
247 my $error .= qq/Couldn't $opname to command "$command": /
248 .qq/Invalid action or component./;
250 $c->log->debug($error) if $c->debug;
255 local $c->request->{arguments} = $args;
256 no warnings 'recursion';
257 $action->dispatch( $c );
262 =head2 $self->detach( $c, $command [, \@arguments ] )
264 Documented in L<Catalyst>
269 my ( $self, $c, $command, @args ) = @_;
270 $self->_do_forward(detach => $c, $command, @args ) if $command;
271 Catalyst::Exception::Detach->throw;
274 sub _action_rel2abs {
275 my ( $self, $c, $path ) = @_;
277 unless ( $path =~ m#^/# ) {
278 my $namespace = $c->stack->[-1]->namespace;
279 $path = "$namespace/$path";
286 sub _invoke_as_path {
287 my ( $self, $c, $rel_path, $args ) = @_;
289 my $path = $self->_action_rel2abs( $c, $rel_path );
291 my ( $tail, @extra_args );
292 while ( ( $path, $tail ) = ( $path =~ m#^(?:(.*)/)?(\w+)?$# ) )
293 { # allow $path to be empty
294 if ( my $action = $c->get_action( $tail, $path ) ) {
295 push @$args, @extra_args;
301 ; # if a match on the global namespace failed then the whole lookup failed
304 unshift @extra_args, $tail;
308 sub _find_component {
309 my ( $self, $c, $component ) = @_;
311 # fugly, why doesn't ->component('MyApp') work?
312 return $c if ($component eq blessed($c));
314 return blessed($component)
316 : $c->component($component);
319 sub _invoke_as_component {
320 my ( $self, $c, $component_or_class, $method ) = @_;
322 my $component = $self->_find_component($c, $component_or_class);
323 my $component_class = blessed $component || return 0;
325 if (my $code = $component_class->can('action_for')) {
326 my $possible_action = $component->$code($method);
327 return $possible_action if $possible_action;
330 if ( my $code = $component_class->can($method) ) {
331 return $self->_method_action_class->new(
335 reverse => "$component_class->$method",
336 class => $component_class,
337 namespace => Catalyst::Utils::class2prefix(
338 $component_class, ref($c)->config->{case_sensitive}
345 qq/Couldn't forward to "$component_class". Does not implement "$method"/;
347 $c->log->debug($error)
353 =head2 $self->prepare_action($c)
355 Find an dispatch type that matches $c->req->path, and set args from it.
360 my ( $self, $c ) = @_;
362 my $path = $req->path;
363 my @path = split /\//, $req->path;
364 $req->args( \my @args );
366 unshift( @path, '' ); # Root action
368 DESCEND: while (@path) {
369 $path = join '/', @path;
372 # Check out dispatch types to see if any will handle the path at
375 foreach my $type ( @{ $self->dispatch_types } ) {
376 last DESCEND if $type->match( $c, $path );
379 # If not, move the last part path to args
380 my $arg = pop(@path);
381 $arg =~ s/%([0-9A-Fa-f]{2})/chr(hex($1))/eg;
385 s/%([0-9A-Fa-f]{2})/chr(hex($1))/eg for grep { defined } @{$req->captures||[]};
387 $c->log->debug( 'Path is "' . $req->match . '"' )
388 if ( $c->debug && defined $req->match && length $req->match );
390 $c->log->debug( 'Arguments are "' . join( '/', @args ) . '"' )
391 if ( $c->debug && @args );
394 =head2 $self->get_action( $action, $namespace )
396 returns a named action from a given namespace.
401 my ( $self, $name, $namespace ) = @_;
404 $namespace = join( "/", grep { length } split '/', ( defined $namespace ? $namespace : "" ) );
406 return $self->_action_hash->{"${namespace}/${name}"};
409 =head2 $self->get_action_by_path( $path );
411 Returns the named action by its full private path.
415 sub get_action_by_path {
416 my ( $self, $path ) = @_;
418 $path = "/$path" unless $path =~ /\//;
419 $self->_action_hash->{$path};
422 =head2 $self->get_actions( $c, $action, $namespace )
427 my ( $self, $c, $action, $namespace ) = @_;
428 return [] unless $action;
430 $namespace = join( "/", grep { length } split '/', $namespace || "" );
432 my @match = $self->get_containers($namespace);
434 return map { $_->get_action($action) } @match;
437 =head2 $self->get_containers( $namespace )
439 Return all the action containers for a given namespace, inclusive
444 my ( $self, $namespace ) = @_;
446 $namespace = '' if $namespace eq '/';
450 if ( length $namespace ) {
452 push @containers, $self->_container_hash->{$namespace};
453 } while ( $namespace =~ s#/[^/]+$## );
456 return reverse grep { defined } @containers, $self->_container_hash->{''};
459 =head2 $self->uri_for_action($action, \@captures)
461 Takes a Catalyst::Action object and action parameters and returns a URI
462 part such that if $c->req->path were this URI part, this action would be
463 dispatched to with $c->req->captures set to the supplied arrayref.
465 If the action object is not available for external dispatch or the dispatcher
466 cannot determine an appropriate URI, this method will return undef.
471 my ( $self, $action, $captures) = @_;
473 foreach my $dispatch_type ( @{ $self->dispatch_types } ) {
474 my $uri = $dispatch_type->uri_for_action( $action, $captures );
475 return( $uri eq '' ? '/' : $uri )
483 expand an action into a full representation of the dispatch.
484 mostly useful for chained, other actions will just return a
490 my ($self, $action) = @_;
492 foreach my $dispatch_type (@{ $self->dispatch_types }) {
493 my $expanded = $dispatch_type->expand_action($action);
494 return $expanded if $expanded;
500 =head2 $self->splice_captures_from( $c, $action, $args )
502 Does nothing if the first element of the list that C<$args> references
503 is an array ref. Otherwise calls this method in each dispatch type,
504 stopping when the first one returns true
508 sub splice_captures_from {
509 my ($self, $c, $action, $args) = @_;
511 return if (!$args || (scalar @{ $args } && ref $args->[0] eq 'ARRAY'));
513 my $params = scalar @{ $args } && ref $args->[-1] eq 'HASH'
514 ? pop @{ $args } : undef;
516 foreach my $dispatch_type ( @{ $self->dispatch_types } ) {
517 last if ($dispatch_type->splice_captures_from( $c, $action, $args ));
520 push @{ $args }, $params if ($params); # Restore query parameters
525 =head2 $self->register( $c, $action )
527 Make sure all required dispatch types for this action are loaded, then
528 pass the action to our dispatch types so they can register it if required.
529 Also, set up the tree with the action containers.
534 my ( $self, $c, $action ) = @_;
536 my $registered = $self->_registered_dispatch_types;
538 #my $priv = 0; #seems to be unused
539 foreach my $key ( keys %{ $action->attributes } ) {
540 next if $key eq 'Private';
541 my $class = "Catalyst::DispatchType::$key";
542 unless ( $registered->{$class} ) {
543 # FIXME - Some error checking and re-throwing needed here, as
544 # we eat exceptions loading dispatch types.
545 eval { Class::MOP::load_class($class) };
546 push( @{ $self->dispatch_types }, $class->new ) unless $@;
547 $registered->{$class} = 1;
551 my @dtypes = @{ $self->dispatch_types };
553 my @low_precedence_dtypes;
555 for my $type ( @dtypes ) {
556 if ($type->_is_low_precedence) {
557 push @low_precedence_dtypes, $type;
559 push @normal_dtypes, $type;
563 # Pass the action to our dispatch types so they can register it if reqd.
564 my $was_registered = 0;
565 foreach my $type ( @normal_dtypes ) {
566 $was_registered = 1 if $type->register( $c, $action );
569 if (not $was_registered) {
570 foreach my $type ( @low_precedence_dtypes ) {
571 $type->register( $c, $action );
575 my $namespace = $action->namespace;
576 my $name = $action->name;
578 my $container = $self->_find_or_create_action_container($namespace);
580 # Set the method value
581 $container->add_action($action);
583 $self->_action_hash->{"$namespace/$name"} = $action;
584 $self->_container_hash->{$namespace} = $container;
587 sub _find_or_create_action_container {
588 my ( $self, $namespace ) = @_;
590 my $tree ||= $self->_tree;
592 return $tree->getNodeValue unless $namespace;
594 my @namespace = split '/', $namespace;
595 return $self->_find_or_create_namespace_node( $tree, @namespace )
599 sub _find_or_create_namespace_node {
600 my ( $self, $parent, $part, @namespace ) = @_;
602 return $parent unless $part;
605 ( grep { $_->getNodeValue->part eq $part } $parent->getAllChildren )[0];
608 my $container = Catalyst::ActionContainer->new($part);
609 $parent->addChild( $child = Tree::Simple->new($container) );
612 $self->_find_or_create_namespace_node( $child, @namespace );
615 =head2 $self->setup_actions( $class, $context )
617 Loads all of the preload dispatch types, registers their actions and then
618 loads all of the postload dispatch types, and iterates over the tree of
619 actions, displaying the debug information if appropriate.
624 my ( $self, $c ) = @_;
627 $self->_load_dispatch_types( @{ $self->preload_dispatch_types } );
628 @{ $self->_registered_dispatch_types }{@classes} = (1) x @classes;
630 foreach my $comp ( values %{ $c->components } ) {
631 $comp->register_actions($c) if $comp->can('register_actions');
634 $self->_load_dispatch_types( @{ $self->postload_dispatch_types } );
636 return unless $c->debug;
637 $self->_display_action_tables($c);
640 sub _display_action_tables {
643 my $avail_width = Catalyst::Utils::term_width() - 12;
644 my $col1_width = ($avail_width * .25) < 20 ? 20 : int($avail_width * .25);
645 my $col2_width = ($avail_width * .50) < 36 ? 36 : int($avail_width * .50);
646 my $col3_width = $avail_width - $col1_width - $col2_width;
647 my $privates = Text::SimpleTable->new(
648 [ $col1_width, 'Private' ], [ $col2_width, 'Class' ], [ $col3_width, 'Method' ]
653 my ( $walker, $parent, $prefix ) = @_;
654 $prefix .= $parent->getNodeValue || '';
655 $prefix .= '/' unless $prefix =~ /\/$/;
656 my $node = $parent->getNodeValue->actions;
658 for my $action ( keys %{$node} ) {
659 my $action_obj = $node->{$action};
661 if ( ( $action =~ /^_.*/ )
662 && ( !$c->config->{show_internal_actions} ) );
663 $privates->row( "$prefix$action", $action_obj->class, $action );
667 $walker->( $walker, $_, $prefix ) for $parent->getAllChildren;
670 $walker->( $walker, $self->_tree, '' );
671 $c->log->debug( "Loaded Private actions:\n" . $privates->draw . "\n" )
674 # List all public actions
675 $_->list($c) for @{ $self->dispatch_types };
678 sub _load_dispatch_types {
679 my ( $self, @types ) = @_;
682 # Preload action types
683 for my $type (@types) {
684 # first param is undef because we cannot get the appclass
685 my $class = Catalyst::Utils::resolve_namespace(undef, 'Catalyst::DispatchType', $type);
687 eval { Class::MOP::load_class($class) };
688 Catalyst::Exception->throw( message => qq/Couldn't load "$class"/ )
690 push @{ $self->dispatch_types }, $class->new;
692 push @loaded, $class;
698 =head2 $self->dispatch_type( $type )
700 Get the DispatchType object of the relevant type, i.e. passing C<$type> of
701 C<Chained> would return a L<Catalyst::DispatchType::Chained> object (assuming
702 of course it's being used.)
707 my ($self, $name) = @_;
709 # first param is undef because we cannot get the appclass
710 $name = Catalyst::Utils::resolve_namespace(undef, 'Catalyst::DispatchType', $name);
712 for (@{ $self->dispatch_types }) {
713 return $_ if ref($_) eq $name;
720 # 5.70 backwards compatibility hacks.
722 # Various plugins (e.g. Plugin::Server and Plugin::Authorization::ACL)
723 # need the methods here which *should* be private..
725 # You should be able to use get_actions or get_containers appropriately
726 # instead of relying on these methods which expose implementation details
727 # of the dispatcher..
729 # IRC backlog included below, please come ask if this doesn't work for you.
731 # <@t0m> 5.80, the state of. There are things in the dispatcher which have
732 # been deprecated, that we yell at anyone for using, which there isn't
733 # a good alternative for yet..
734 # <@mst> er, get_actions/get_containers provides that doesn't it?
735 # <@mst> DispatchTypes are loaded on demand anyway
736 # <@t0m> I'm thinking of things like _tree which is aliased to 'tree' with
737 # warnings otherwise shit breaks.. We're issuing warnings about the
738 # correct set of things which you shouldn't be calling..
740 # <@mst> basically, I don't see there's a need for a replacement for anything
741 # <@mst> it was never a good idea to call ->tree
742 # <@mst> nothingmuch was the only one who did AFAIK
743 # <@mst> and he admitted it was a hack ;)
745 # See also t/lib/TestApp/Plugin/AddDispatchTypes.pm
747 # Alias _method_name to method_name, add a before modifier to warn..
748 foreach my $public_method_name (qw/
750 registered_dispatch_types
755 my $private_method_name = '_' . $public_method_name;
756 my $meta = __PACKAGE__->meta; # Calling meta method here fine as we happen at compile time.
757 $meta->add_method($public_method_name, $meta->get_method($private_method_name));
759 my %package_hash; # Only warn once per method, per package. These are infrequent enough that
760 # I haven't provided a way to disable them, patches welcome.
761 $meta->add_before_method_modifier($public_method_name, sub {
762 my $class = caller(2);
764 $package_hash{$class}++ || do {
765 warn("Class $class is calling the deprecated method\n"
766 . " Catalyst::Dispatcher::$public_method_name,\n"
767 . " this will be removed in Catalyst 5.9X\n");
772 # End 5.70 backwards compatibility hacks.
774 __PACKAGE__->meta->make_immutable;
782 Catalyst Contributors, see Catalyst.pm
786 This library is free software. You can redistribute it and/or modify it under
787 the same terms as Perl itself.