[cgiapp] Re: CAP::DebugScreen and ErrorDocument

[Mark Stosberg <suppressed>]

On 2005-12-22, Michael Peters <suppressed> wrote:
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> I decided to play with CAP::DebugScreen (since it uses my CAP::ViewCode and I
> was interested to see what someone is doing with my stuff :) and I have to say
> that I like it. It's fairly simple and really easy for tracking down fatal
> errors with a nice stack trace. Overall it's pretty spiffy :)

I also am a fan. The pending integration with ViewCode goes the final
mile-- you can click on the line where there is an error and jump right
to that line with ViewCode.

Now we just need a Firefox extension to reload the file in editor at
just that line. Hmmm...

> However, I did have some problems getting it to work correctly with my setup. I
> typically use an ErrorDocument setting in httpd.conf so that all errors are the
> same throughout a site. However, CAP::DebugScreen only works if fatal errors are
> thrown and it doesn't add a error_mode() but instead uses the 'error' callback.
> So while the callback is executed, no error_mode() exists, so C::A simply
> croaks() and Apache will serve a different doc, not the one generated by
> CAP::DebugScreen.
>
> Attached is a patch that will make CAP::DS add an error_mode during the init
> phase instead of the error callback.
>
> But I was wondering about whether this is the right approach or not. In C::A,
> the error callback will get executed on errors but it can never trap them.
> Should this be the case? The callback will only be able to do things like
> logging, etc. Is this the intent?

The error callback is little experimental, because we weren't sure how
people would use it. Logging was definitely a use case that we had in
mind. DebugScreen didn't exist then.

Anyway, you might try sending you patch through RT, since I haven't
noticed this module author lurking here. 

It looks like there is also CGI::Carp::DebugScreen now, too:
http://search.cpan.org/~ishigaki/CGI-Carp-DebugScreen-0.03/

Which will be useful for non CGI::App projects.

    Mark


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