func openLocalPort()

in net/port.go [111:137]

• 27 lines of code
• 6 McCabe index (conditional complexity)

func openLocalPort(lp *LocalPort) (Closeable, error) {
	var socket Closeable
	hostPort := net.JoinHostPort(lp.IP, strconv.Itoa(lp.Port))
	switch lp.Protocol {
	case TCP:
		network := "tcp" + string(lp.IPFamily)
		listener, err := net.Listen(network, hostPort)
		if err != nil {
			return nil, err
		}
		socket = listener
	case UDP:
		network := "udp" + string(lp.IPFamily)
		addr, err := net.ResolveUDPAddr(network, hostPort)
		if err != nil {
			return nil, err
		}
		conn, err := net.ListenUDP(network, addr)
		if err != nil {
			return nil, err
		}
		socket = conn
	default:
		return nil, fmt.Errorf("unknown protocol %q", lp.Protocol)
	}
	return socket, nil
}