module for getting current "port" in mongrel/unicorn environment

server_info.rb

module ServerInfo
  def server_port
    port = nil
    if (defined?(::Mongrel) && defined?(::Mongrel::HttpServer))
      ObjectSpace.each_object(Mongrel::HttpServer) do |mongrel|
        @mongrel = mongrel
      end
      port = @mongrel.andand.port
    end
    if (defined?(::Unicorn) && defined?(::Unicorn::HttpServer))
      ObjectSpace.each_object(Unicorn::HttpServer) do |unicorn|
        @unicorn = unicorn
      end
      port = $0.gsub(/.*worker\[(\d+)\].*/, '\1') if @unicorn
    end
    port
  end
end