NAME

Devel::StackTrace::Extract - Extract a stack trace from an exception object

VERSION

version 1.000000

DESCRIPTION

It's popular to store stack traces in objects that are thrown as exceptions, but, this being Perl, there's more than one way to do it. This module provides a simple interface to attempt to extract the stack trace from various well known exception classes that are on the CPAN.

FUNCTION

Exported on demand or can be used fully qualified

extract_stack_trace($exception_object)

Returns a Devel::StackTrace stack trace object extracted from the exception object or returns undef if no stack trace can be extracted with the current heuristics.

The current rules that this uses to determine how to get a stack trace are, in order, as follows (these are subject to change without notice):

• If it has a method called stack_trace use that

  This works with anything that uses the StackTrace::Auto Moose/Moo role, or subclasses the Throwable::Exception class.

• If it is a Mojo::Exception, and has a method called frames use that

  If we have a modern Mojo::Exception object with a frames method, and it has its frames populated (i.e. someone used the trace method, or called throw) then we'll synthesize a Devel::StackTrace instance from that.

• If it has a trace method call that

  This works for Exception::Class built exception objects, as well as any Moose::Exception instances.

BUGS

The heuristics in this make no attempt to check whatever is returned by the exception classes are valid Devel::StackTrace objects

Mojo::Exception objects don't keep track of the arguments that are passed to a stack frame, so the Devel::StackTrace that this synthesizes acts as if every subroutine was called without arguments.

SEE ALSO

Devel::StackTrace

Throwable::Error and StackTrace::Auto

Exception::Class

Moose::Exception

Mojo::Exception

AUTHOR

Mark Fowler mfowler@maxmind.com

CONTRIBUTORS

• Dave Rolsky drolsky@maxmind.com
• Mark Fowler mark@twoshortplanks.com
• Olaf Alders oalders@maxmind.com

COPYRIGHT AND LICENSE

This software is copyright (c) 2016 by MaxMind, Inc.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.