module Typhoeus::Request::Callbacks::Types

def on_complete(&block)
  @on_complete ||= []
  @on_complete << block if block_given?
  @on_complete
end

def on_failure(&block)
  @on_failure ||= []
  @on_failure << block if block_given?
  @on_failure
end

def on_success(&block)
  @on_success ||= []
  @on_success << block if block_given?
  @on_success
end