[dancer-users] Vanishing hooks with multiple plugins (Was: Plugin nesting in Dancer2)

4 Oct 2013

      As a follow up, I encountered the following problem when writing some D2
plugins: only the hooks of the last loaded plugin are kept, the others
are lost. See the minimal example below.

App:

##

#!/usr/bin/env perl

use FindBin;
use lib "$FindBin::Bin/../lib";

use Dancer2;
use Dancer2::Plugin::Second;
use Dancer2::Plugin::First;

our $VERSION = '0.1';

hook "first_after" => sub {
    debug "first after";
};

hook "first_before" => sub {
    debug "first before";
};

hook "second_after" => sub {
   debug "second after";
};

hook "second_before" => sub {
   debug "second before";
};

get '/' => sub {
    test;
    other_test;
    return "OK";
};

dance;

## First.pm

package Dancer2::Plugin::First;

use strict;
use warnings;

use Dancer2::Plugin;

register_hook 'first_after';
register_hook 'first_before';

register test => sub {
    my $dsl = shift;
    execute_hook("first_before");
    execute_hook("first_after");
};

register_plugin;

1;

## Second.pm

package Dancer2::Plugin::Second;

use strict;
use warnings;

use Dancer2::Plugin;

register_hook 'second_after';
register_hook 'second_before';

register other_test => sub {
    my $dsl = shift;
    execute_hook("second_before");
    execute_hook("second_after");
};

register_plugin;

1;

## end

(also attached)

When starting the app it dies:

Invalid hook name `second_after' at
/home/melmoth/perl5/perlbrew/perls/perl-5.16.3/lib/site_perl/5.16.3/Dancer2/Core/DSL.pm
line 129.

I inserted some debug into Core::DSL and this is the list of the hooks
it's recognizing:

$VAR1 = {
          'before_error_render' => 'core.error.before',
          'on_route_exception' => 'core.app.route_exception',
          'after_error_render' => 'core.error.after',
          'before_error_init' => 'core.error.init',
          'after_serializer' => 'engine.serializer.after',
          'first_before' => 'plugin.first.first_before',
          'after' => 'core.app.after_request',
          'init_error' => 'core.error.init',
          'after_error' => 'core.error.after',
          'before_error' => 'core.error.before',
          'before_layout_render' => 'engine.template.before_layout_render',
          'before' => 'core.app.before_request',
          'after_request' => 'core.app.after_request',
          'after_file_render' => 'handler.file.after_render',
          'before_template_render' => 'engine.template.before_render',
          'before_serializer' => 'engine.serializer.before',
          'after_layout_render' => 'engine.template.after_layout_render',
          'first_after' => 'plugin.first.first_after',
          'before_file_render' => 'handler.file.before_render',
          'before_request' => 'core.app.before_request',
          'after_template_render' => 'engine.template.after_render'
        };

No trace of the second_after, second_before. If I invert the order of
the loading, it dies on "first_after".

Using only one of the two plugins appears fine.

Any clue?

Thanks in advance and best wishes

-- 
Marco

[dancer-users] Vanishing hooks with multiple plugins (Was: Plugin nesting in Dancer2)

Marco Pessotto