Re: [soaplite] OO-ish Exception Handling
- Hi all,
First of all sorry for buggin' you all with all those
gory details :-)
After going thro the Error.pm code, I realize that
none of these patches are called for in SOAP::Lite
The problem is with Error.pm and how it handles the
'-value' attribute and the overloading method value()
for '+0'. I have sent a detailed mail to Graham (Barr)
the author of Error.pm, giving the details and a also
a fix for this. I hope he'll incorporate that in
Error.pm very soon. (Anyway, I yet to hear from Graham,
I'll keep u all informed when that happens)
If someone is interested in the patch then I can send
you my patch against Error-0.13, off the list.
On Mon, 7 May 2001 u_arunkumar@... wrote:
> Hi all,
> I am planning to implement OO-ish error handling over SOAP. (Using
> Graham Barr's 'Error' module). I initially thought that if I simply
> throw Simple::Error("Some Exception on the Server");
> then I would get the exception reported on the client side. But when I
> actually tried that, to my surprise I was not getting the exception
> reported on the client. (If someone is interested in knowing why, then
> let me know I'll explain that).
> After a quick peek into the SOAP/Lite.pm and the behaviour
> of thrown Exceptions under a eval block, I was able to discover that
> the SOAP/Lite.pm's handle() method was not detecting the throw() call
> because it was coded as follows:
> die ref $@ ?
> $@ : $@ =~ /^Can't locate object method "$method_name"/ ?
> "Failed to locate method ($method_name) in class ($class)" :
> if ($@);
> I had to make the following changes for the exception to be detected:
> - if ($@);
> + if ($@) or (ref($@);
> # normal result
> - return $result unless ($@);
> + return $result unless ($@ or ref($@));
> and also insert the following line between the last two make_fault()
> in the method.
> return $self->make_fault(ref($@), "$@", $@)
> if UNIVERSAL::isa($@ => 'Error');
> The above statement would ensure that all exception classes derived
> from 'Error' would be considered.
> (If the above description is confusing I can post the diffs against
> With this I am able to get the exception thrown to the remote end over
> SOAP. Now I have to figure out a way to rethrow the exception at the
> client end using the same exception class. Because on the client end
> I would receiving only a SOAP Fault and not an exception thrown from
> that class. Once this is done then we would have a fully functional
> OO-ish exception handling system working over SOAP.
> Paul !! if you are listening :-) kindly let me know your comments
> If you folks think that I am insane saying all this then please
> bear with me :-)
> Also mind you I am trying to implement this over a TCP Transport and
> both my client and server would be using SOAP::Lite. I have really not
> considered all the other combinations SOAP::Lite can handle (and that
> is exactly why I am posting this on the list, to get people on the
> list to apply this to their situations ..)
> With this you can SOAPify any class that handles exceptions in a
> OO-ish style and still have the same exception thrown/caught at the
> remote end.
> Any hints/suggestions on how to have the client rethrow the exception
> from the same Exception class as the server, would be most welcome.
> Best Regards,
> P.S: Paul !! would you be interested in incorporating this in