From: Doug Jolley <lists@...>
Date: 2012-07-07T00:32:52+09:00
Subject: Re: Rescue Failing in CGI Script

Thanks for the input.  I tried to follow your suggestions; but, it's
still misbehaving.  So, I would like to make sure that I fully
understand your suggestions.

> Make sure you wrapped the entire thing in the begin-rescue block.

I'm not exactly sure what you mean by "entire thing".  What I am saying
is that begin-rescue-end blocks exist.  When I introduce the error
(either by using raise or by using my pet of divide-by-zero) I introduce
it WITHIN the begin-rescue block.  That should be sufficient, right?

> Make sure you use "rescue Exception" (plain "rescue" only catches
> StandardError).

Understood.  I do use the Exception argument in this case.  In some of
my earlier cases I used rescue with no arguments which may explain why
some exceptions were caught and some were not (in those earlier cases).

> Make sure that the actual work is not done in some threads.

I've never written a multi-threaded script.  My limited understanding
would be that if there were multiple threads I would have had to have
created them with Thread.new.  There are no calls to Thread.new in this
entire script.

> Have you tried somehow running the code as a standalone and seeing in
> the exceptions are catched?

No, I haven't.  I definitely agree that that could be very revealing.
To get that job done I would have to somehow produce equivalent
stand-alone code that would reproduce the problem.  I'm thinking that
that might be a very tall order.  I'm concerned that I won't be able to
develop equivalent stand-alone code that reproduces the problem.  If I
can't get this fixed some other way, I may have to give that a try.  I
certainly hope that it doesn't come to that.

Thanks again for the input.  If you have any further thoughts, I'd love
to hear them.

         ... doug

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