[Catalyst] Unable to output anything in Root.pm -> 'auto'

[Lukas Thiemeier]

Hi again,

about the missing sessionid:

I don't know much about the internals of Catalyst::Plugin::Session, but
I guess that the session is a lazy attribute, and only created if used.
This means: unless you put something in the session, you will not have
one, and therefore have no session-id.

This is very handy, because the overhead related to creating and
restoring a session is only executed if the session is really needed.
If your app has a session-less interface without authentication, and
extra functionality for authenticated users, the session will only be
created for authenticated users.

If you touch your session object before fetching the session-id, it will
work:

$c->session;
$c->res->body("SESSIONID " . $c->sessionid);

As soon as you implemented authentication, the session will be used and
the session-id will be set.

By the way, what do you need the session-id for? Catalyst handles
sessions in a transparent way. In most cases, you don't need to access
the session-id in your code. And if it is only for debugging: The
session plugin writes the session-id to $c->log when a session is
created or restored. This means: the code showed above will result in
the session-id being printed twice :)

Lukas

On 10/29/2012 04:04 PM, Craig Chant wrote:
> Oh I also tried changing it to ‘begin’ instead of ‘auto’, still doesn’t
> work?
> 
>  
> 
> I also thought that all calls to ANY method / sub will always be passed
> $self & $c , only it doesn’t seem to be passing in $c and I’ve had to
> manually do it?
> 
>  
> 
> I’ve tried…
> 
>  
> 
> # always runs first!
> 
> sub begin :Private {
> 
>     my ( $self, $c ) = @_;
> 
>  
> 
>     # Authenticate
> 
>     $self->AuthenticateUser($c);   
> 
>     return 1;
> 
>    
> 
> }
> 
>  
> 
> sub AuthenticateUser {
> 
>    
> 
>     my ( $self, $c ) = @_;
> 
>    
> 
>     die 'Session ID = ' . $c->sessionid;
> 
>    
> 
> }
> 
>  
> 
> But there is no session ID.
> 
>  
> 
> I am still getting the “Use of uninitialized value in concatenation (.)
> or string”  error.
> 
>  
> 
> I’ve read
> http://search.cpan.org/~mramberg/Catalyst-Plugin-Session-0.14/lib/Catalyst/Plugin/Session/Tutorial.pod
> 
>  
> 
> Where it states :  These plugins will automatically set
> |$c->sessionid|at the begining of the request, and automatically cause
> |$c->sessionid|to be saved by the client at the end of the request.
> 
> So why is $c->sessionid uninitialized?
> 
>  
> 
> Any ideas where my session info is?
> 
>  
> 
> Thanks,
> 
>  
> 
> Craig
> 
>  
> 
> *From:*Craig Chant [mailto:craig at homeloanpartnership.com]
> *Sent:* 29 October 2012 14:54
> *To:* The elegant MVC web framework
> *Subject:* RE: [Catalyst] Unable to output anything in Root.pm -> 'auto'
> 
>  
> 
> Nope, no change; same warning in the devel output and all that happens
> is the  welcome screen loads?
> 
>  
> 
> *From:*Ben Vinnerd [mailto:ben+catalyst at vinnerd.com]
> <mailto:[mailto:ben+catalyst at vinnerd.com]>
> *Sent:* 29 October 2012 14:48
> *To:* The elegant MVC web framework
> *Subject:* Re: [Catalyst] Unable to output anything in Root.pm -> 'auto'
> 
>  
> 
> Private methods have to return a true value to continue processing.
> 
> Try adding "return 1" at the end of the method.
> 
> Ben
> 
> On 29 October 2012 14:23, Craig Chant <craig at homeloanpartnership.com
> <mailto:craig at homeloanpartnership.com>> wrote:
> 
> Hi,
> 
>  
> 
> I seem to be going round in circles unable to get Catalyst to output
> anything via ‘auto’?
> 
>  
> 
> I made a change to the Root.pm to try to add authentication via the
> ‘auto’ method, but it does nothing?
> 
>  
> 
> # always runs first!
> 
> sub auto :Private {
> 
>     my ( $self, $c ) = @_;
> 
>  
> 
>     # Authenticate
> 
>     $c->response->body('Matched Members::Controller::Auto in Root.' .
> $c->sessionid);   
> 
>  
> 
> }
> 
>  
> 
> This doesn’t output anything and I simply get the welcome screen, plus
> there is a warning in the devel server output of
> 
>  
> 
> “Use of uninitialized value in concatenation (.) or string”
> 
>  
> 
> I have ..
> 
>  
> 
> use Catalyst qw/
> 
>     -Debug
> 
>     ConfigLoader
> 
>     Static::Simple
> 
>     StackTrace
> 
>     Session 
> 
>     Session::Store::FastMmap 
> 
>     Session::State::Cookie   
> 
> /;
> 
>  
> 
> In my main MyApp.pm
> 
>  
> 
> Why is $c->response->body not working and why is the sessionid empty?
> 
>  
> 
> Thanks
> 
>  
> 
> */Craig Chant/*
> 
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> checks before opening any documents. HomeLoan Partnership will not
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> HomeLoan Partnership reserves the right to monitor and archive all
> e-mail communications through its network. No representative or employee
> of HomeLoan Partnership has the authority to enter into any contract on
> behalf of HomeLoan Partnership by email. HomeLoan Partnership is a
> trading name of H L Partnership Limited, registered in England and Wales
> with Registration Number 5011722. Registered office: 26-34 Old Street,
> London, EC1V 9QQ. H L Partnership Limited is authorised and regulated by
> the Financial Services Authority.
> 
> This Email and any attachments contain confidential information and is
> intended solely for the individual to whom it is addressed. If this
> Email has been misdirected, please notify the author as soon as
> possible. If you are not the intended recipient you must not disclose,
> distribute, copy, print or rely on any of the information contained, and
> all copies must be deleted immediately. Whilst we take reasonable steps
> to try to identify any software viruses, any attachments to this e-mail
> may nevertheless contain viruses, which our anti-virus software has
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> checks before opening any documents. HomeLoan Partnership will not
> accept any liability for damage caused by computer viruses emanating
> from any attachment or other document supplied with this e-mail.
> HomeLoan Partnership reserves the right to monitor and archive all
> e-mail communications through its network. No representative or employee
> of HomeLoan Partnership has the authority to enter into any contract on
> behalf of HomeLoan Partnership by email. HomeLoan Partnership is a
> trading name of H L Partnership Limited, registered in England and Wales
> with Registration Number 5011722. Registered office: 26-34 Old Street,
> London, EC1V 9QQ. H L Partnership Limited is authorised and regulated by
> the Financial Services Authority.
> 
> 
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