package Catalyst::Plugin::Hooks;
use strict;
use warnings;
use NEXT;
use Carp;
our $VERSION = '0.03';
my %actions;
@actions{ qw(
handle_request
prepare
prepare_request
prepare_connection
prepare_query_parameters
prepare_headers
prepare_cookies
prepare_path
prepare_body
prepare_body_parameters
prepare_parameters
prepare_uploads
prepare_action
dispatch
finalize
finalize_uploads
finalize_error
finalize_headers
finalize_cookies
finalize_body
) } = ();
for my $action ( keys %actions ) {
no strict 'refs';
*{"add_". $action ."_hook"} = sub {
my ( $c, $hook ) = @_;
croak "add_". $action ."_hook( CODE )" unless ref $hook eq "CODE";
__PACKAGE__->initialize_action( $action )
unless $action->{initialized};
push @{ $actions{$action}->{before} }, $hook;
};
*{"add_before_". $action ."_hook"} = \*{"add_". $action ."_hook"};
*{"add_after_". $action ."_hook"} = sub {
my ( $c, $hook ) = @_;
croak "add_after_". $action ."_hook( CODE )" unless ref $hook eq "CODE";
__PACKAGE__->initialize_action( $action )
unless $action->{initialized};
push @{ $actions{$action}->{after} }, $hook;
};
*{"remove_all_". $action ."_hooks"} = sub {
$actions{$action}->{before} = [];
$actions{$action}->{after} = [];
};
}
sub initialize_action {
my ( $self, $action ) = @_;
no strict 'refs';
### Had to use eval for NEXT::$action
eval q/ sub /. $action .q/ {
my $c = shift;
my $action = '/. $action .q/';
for my $hook ( @{ $actions{$action}->{before} } ) {
$hook->( $c, @_ );
}
$c->NEXT::/. $action .q/(@_);
for my $hook ( @{ $actions{$action}->{after} } ) {
$hook->( $c, @_ );
}
} /;
die $@ if $@;
$actions{ $action }->{initialized} = 1;
}
sub remove_all_hooks {
my $self = shift;
for my $action ( values %actions ) {
$action->{before} = [];
$action->{after} = [];
}
}
1
__END__
=head1 NAME
Catalyst::Plugin::Hooks - Add hooks to Catalyst engine actions
=head1 SYNOPSIS
In MyApp.pm:
use Catalyst qw(
-Debug
Hooks
);
In Some model:
sub new {
my $self = shift;
my ( $c ) = @_;
$self = $self->NEXT::new( @_ );
open my $filehandle, "> foo.log";
$c->add_after_finalize_hook( sub {
my $c = shift;
$filehandle->flush();
$c->log->info( "Flushed filehandle after finalize" );
} );
return $self;
}
=head1 DESCRIPTION
Don't use this plugin!
Use L<Catalyst::Plugin::Observe>. All functionality provided in C:P:Hooks will
very shortly be available in C:P:Observe. C:P:Hooks is probably not going to
work in the next Catalyst release, so rewrite your code to use C:P:Observe.
This Plugin is usefull for when you want to run some code before or after a
catalyst engine action. Consider writing a Catalyst plugin if you implement
more general functionality. But let's say you want to flush your log's
filehandle after the request is done (then the requestor doesn't have to wait
for your log's to be flushed). It would be nice to put the code for flushing
the filehandle next to the rest of the code that's bothered with the
filehandle, so you don't have to pass the filehandle around. Example for this
is shown in the L</SYNOPSIS>.
Hooks are addable everywhere a $c exists, even in Controllers. But remember,
adding a hook every request will cause a memory overflow. So don't put these
methods in Controller actions.
=head2 METHODS
All of these methods are currently hookable:
handle_request
prepare
prepare_request
prepare_connection
prepare_query_parameters
prepare_headers
prepare_cookies
prepare_path
prepare_body
prepare_body_parameters
prepare_parameters
prepare_uploads
prepare_action
dispatch
finalize
finalize_uploads
finalize_error
finalize_headers
finalize_cookies
finalize_body
To add a I<before> hook:
$c->add_ <method name> _hook( sub { some code } );
To add an I<after> hook:
$c->add_after_ <method name> _hook( sub { some code } );
C<< $c->add_before_ <method name> _hook >> is an alias to C<< $c->add_ <method name> _hook >>.
To remove all hooks for an action:
$c->remove_all_ <method name> _hooks;
To remove all hooks set by this module:
$c->remove_all_hooks;
=head1 SEE ALSO
L<Catalyst>,
L<Catalyst::Manual::Internals> for when the different actions are called.
=head1 AUTHOR
Berik Visschers <berikv@xs4all.nl>
=cut