[dancer-users] exceptional dancing

[Sawyer X]

Here's one module we're going to use in the future for all exceptions in
Dancer2: Throwable::Error (and its role: Throwable).


On Thu, Nov 20, 2014 at 7:16 PM, Andrew Beverley <andy at andybev.com> wrote:

> On Thu, 2014-11-20 at 13:29 +0200, WK wrote:
> > So I have simple question: how and where to catch errors in Dancer
> > app?
>
> As Ovid says, there are many ways to approach the problem. This is mine.
>
> I use Log::Report, which has the advantage of doing translations and
> logging, as well as handling exceptions. For errors, it provides various
> levels ("error", "warn", "info" etc).
>
> Log::Report provides one or more dispatchers, which can be configured to
> filter on the severity of the error message. A dispatcher can be a
> callback, so I configure multiple dispatchers for different types of
> messages.
>
> If it's a user error then that will be displayed to the web page, and
> depending on the severity I'll either allow the route to continue or
> stop it there. Otherwise I'll log it to the system, which I plan to do
> with errbit in the future.
>
> Whenever I call a function in my controller, I wrap it in my own eval
> equivalent:
>
>     process(sub {...})
>
> This function does the work, and if it's fatal (including for a user
> error) it stops the route and displays the error.
>
>     sub process
>     {
>         my $coderef = shift;
>         try {&$coderef};
>         $@->reportFatal(to => 'error_handler', is_fatal => 0);
>         $@ ? 0 : 1; # Return true on success
>     }
>
> In terms of exceptions that I wasn't expecting (e.g. unable to connect
> to the database), I catch all of these using the init_error hook:
>
>     hook init_error => sub {
>         my $error = shift;
>         panic $error->{exception};
>     };
>
> This works, but it's a bit messy, so I'd like to find a better way of
> doing it.
>
> That's it in short. I hope to write it all up at some point and/or
> create a plugin, but feel free to ask questions in the meantime.
>
> Andy
>
>
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