asynchronous awaited execution in event machine

await_execute.rb

 def execute_awaited
    fiber = Fiber.current
    execute # run some non blocking code (return immidiatly)
    self.callback do |response|
      EventMachine.schedule do
        fiber.resume response
      end
    end
    self.errback do |err|
      EventMachine.schedule do
        fiber.resume err
      end
    end
    result = Fiber.yield
    if result.is_a?(Exception)
      raise result
    end
    result
  end