From: Martin Hansen <mail@...>
Date: 2010-08-05T19:06:05+09:00
Subject: Abstracting exception handling

Hello,

I am interested in abstracting exception handling so it can be included
to any script from some external file. First, I want to setup signal
handling, and last I want to deal with exceptions. Now, in this little
test of mine something is bad, since the exception is not caught. I
suspect something is going out of scope and lost?


Martin


#!/usr/bin/env ruby

def do_at_begin
  exit_status = "OK"

  # Install signal handlers
  %w( INT TERM QUIT ).each do |signal|
    Signal.trap(signal) do
      exit_status = signal
      exit
    end
  end

  exit_status
end

def do_at_exit(exit_status="OK-default")
  begin
  rescue Exception => exception
    $stderr.puts "Exception caught!"
    $stderr.puts exit_status
    $stderr.puts exception.backtrace
  ensure
    puts "DEBUG EXIT STATUS: #{exit_status}"
  end
end

exit_status = do_at_begin

raise

END {
  do_at_exit(exit_status)
}
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