[dancer-users] Again: Scope of 'hook before'

[Peter Mottram]

On 03/03/16 15:36, Rick Westerman wrote:
> Still looking for an answer as to the scope of a 'hook before'.  Does
> it affect all of the routes or just the routes within a 'prefix'.   My
> understanding is that Dancer2 does away with the globals found in
> Dancer thus I would expect that a 'hook before' within a 'prefix'
> would remain within the scope of the 'prefix' and not flow outside of
> it into the other routes.  But this is not what I find thus I am
> curious as to if I am doing something wrong or have my concept wrong.
>

Scope for hooks is the current app whereas 'prefix' is more a way to
group route handlers and save some typing. In your example you load
myapp::admin into app 'myapp' so the hook is active for all routes in
app 'myapp' including get '/'.

If you want per-app hooks then you need two apps:

<code>

package myapp;
use Dancer2;

get '/' => sub {
    return 'main ' . dancer_version;
};

true;

package myapp::admin;
use Dancer2;

hook 'before' => sub {
    if ( dancer_app->environment ne 'rick' ) {
        return halt;
    }
};

get '/' => sub { return 'admin' };

true;

</code>

You also need a new app.psgi to build both apps:

<code>

#!/usr/bin/env perl

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

use myapp;
use myapp::admin;
use Plack::Builder;

builder {
    mount '/'      => myapp->to_app;
    mount '/admin' => myapp::admin->to_app;
};

</code>

Notice that myapp::admin no longer uses 'prefix' since all of its routes
are relative to the mount point of the app.

R.
PeteM

> Thanks,
> -- Rick
>
> ----  Original message ----
>
> Hello.  New Dancer2 user here.  I am having problems with the scope of
> a 'hook before' while using 'prefix'.  I am not sure if I am doing
> something dumb or if this is simply not possible or something else is
> going on.
>
> Using the prefix example from the Cookbook I have two modules
>
> package myapp;
> use Dancer2;
> use myapp::admin;
>
> prefix undef;
> get '/' => sub { return 'main ' . dancer_version };
> 1;
>
> And
>
> package myapp::admin;
> use Dancer2 appname => 'myapp';
>
> prefix '/admin';
>
> hook 'before' => sub {
>     if (dancer_app->environment ne 'rick') {
>         return halt;
>     }
> };
>
> get '/' => sub { return 'admin' };
> 1;
>
> As expected when running with environment 'rick' then the following
> output is produced:
>
> /        ==> main 0.166001
> /admin/  ==> admin
>
> But, unexpectedly to me, using the default 'development' environment
> has the app just halting as it, I presume, hits the 'hook before'.   
> I would have expected '/' to return with 'main 0.166001' while
> '/admin/' to halt.   In other words I would expect that the 'hook
> before' is kept within the scope of the prefix '/admin' and not bleed
> over to the undef prefix.
>
> Any ideas on what is happening? 
>
> Thanks,
> -- 
> Rick Westerman 
> westerman at purdue.edu
>
> Bioinformatics specialist at the Genomics Facility.
> Phone: (765) 494-0505           FAX: (765) 496-7255
> Department of Horticulture and Landscape Architecture
> 625 Agriculture Mall Drive
> West Lafayette, IN 47907-2010
> Physically located in room S049, WSLR building
>
>
> _______________________________________________
> dancer-users mailing list
> dancer-users at dancer.pm
> http://lists.preshweb.co.uk/mailman/listinfo/dancer-users

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