| Subject: | CGI::Carp fatalsToBrowser does not catch stringifiable objects |
When an exception module like Exception::Class 1.24 is used that uses
die and exception objects to throw exceptions, uncaught exceptions
(effectively die calls with object references instead of strings) are
not intercepted by CGI::Carp. After reviewing the source to both
Exception::Class and CGI::Carp this is due to CGI::Carp's unwillingness
to touch objects it does not understand (because it does not have a
reliable way to stringify them?).
Well Exception::Class overloads the "" operator to enable
stringification if the caller expects strings. So in order to get
CGI::Carp to intercept uncaught exceptions that are outside of an eval
block, I had to add the following to CGI::Carp.pm 1.30_01:
318a319
Show quoted text
> use overload;
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Show quoted text> $arg = "$arg" if overload::Method($arg, '""'); # Exception::Class
stringification compatibility
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All this does is stringify an object if it has overloaded the ""
operator. This allows CGI::Carp to intercept and reformat uncaught
exceptions thrown from Exception modules implemented similar to
Exception::Class.
Also it is important that this line is placed after the ineval check
block because it is likely exceptions should not be intercepted when
they are thrown inside of an eval block. I believe eval is the only
mechnism used to effectively catch exceptions.