[dancer-users] Session request crashed (using Dancer::Session::Memcached)

10 Apr 2013

      Hi everyone

I've reverted my app mentioned in my previous post from Dancer2 back to
Dancer 1.3111.

This time, an error is shown, but I have no clue what the problem is.

[hit #2]request to GET /panel/login crashed: Can't call method "id" without
a package or object reference at
/usr/lib/perl5/site_perl/5.12.3/Dancer/Session.pm line 36, <DATA> line 16.
in /usr/lib/perl5/site_perl/5.12.3/Dancer/Handler.pm l. 98

This app works without error using the Simple, YAML and JSON session
engines, but fails with Memcached. I know the Memcached instance is working
as per my previous post, as accessing it with a regular perl script using
Cache::Memcached works.

It seems either something's amiss with my Memcached instance, which the
test script doesn't pick up, or there's a bug in Dancer::Session::Memcached?

Any pointers would be appreciated. Info follows.

config.yaml:

session: "memcached"
memcached_servers: "/srv/web/app/sock/sessions.sock"
session_timeout: 10

running the app as the same user owning the socket above.

./bin/app.pl

==== app.pl ====

#!/usr/bin/env perl
use Dancer;
use app;
start;

==== lib/app.pm ====

package app;
use Dancer ':syntax';
use Dancer::Session::Memcached;
use Authen::Simple::Passwd;

our $VERSION = '0.2';

hook 'before' => sub {
  if (request->path_info !~ m{^/app/log}) {
    # match login and logout
    if (session('user') && session('time')) {
      my $time_now = time;
      if ($time_now - session('time') < config->{'session_timeout'}) {
        session 'time' => $time_now;
        #context->session 'time' => $time_now;
      }
      else {
        return redirect '/app/logout?msg=session_expired&path=' .
request->path_info;
      }
    }
    else {
      return redirect '/app/login';
    }
  }
};

get '/app/login' => sub {

  my $hostname = request->{'host'};
  my $msg = 'please login';
  if (exists params->{'msg'}) {
    $msg = params->{'msg'};
    $msg =~ s/_/ /g;
  }
  my $path = '/app/dashboard';
  if (exists params->{'path'}) {
    $path = params->{'path'};
  }
  template 'login.tt', { hostname => $hostname, title => 'login', path =>
$path, message => $msg };

post '/app/login' => sub {

  # Validate web<nm> username and password against /etc/passwd
  # TODO: use RESTful API to query api.zootzone.com
  if (params->{'pass'} ne '') {
    my $passwd = Authen::Simple::Passwd->new( path => config->{'passwords'}
);
    if ($passwd->authenticate(params->{'user'}, params->{'pass'})) {
      session 'user' => params->{'user'};
      session 'time' => time;
      if (params->{'path'}) {
        return redirect params->{'path'};
      }
      else {
        return redirect '/app/dashboard';
      }
    }
    else {
      return redirect '/app/login?msg=authentication_failed';
    }
  } else {
    return redirect '/app/login?msg=invalid_credentials';
  }
};

other routes ....

[dancer-users] Session request crashed (using Dancer::Session::Memcached)

Dale Gallagher