func NewLocalPort()

in net/port.go [66:84]

• 19 lines of code
• 12 McCabe index (conditional complexity)

func NewLocalPort(desc, ip string, ipFamily IPFamily, port int, protocol Protocol) (*LocalPort, error) {
	if protocol != TCP && protocol != UDP {
		return nil, fmt.Errorf("Unsupported protocol %s", protocol)
	}
	if ipFamily != "" && ipFamily != "4" && ipFamily != "6" {
		return nil, fmt.Errorf("Invalid IP family %s", ipFamily)
	}
	if ip != "" {
		parsedIP := ParseIPSloppy(ip)
		if parsedIP == nil {
			return nil, fmt.Errorf("invalid ip address %s", ip)
		}
		asIPv4 := parsedIP.To4()
		if asIPv4 == nil && ipFamily == IPv4 || asIPv4 != nil && ipFamily == IPv6 {
			return nil, fmt.Errorf("ip address and family mismatch %s, %s", ip, ipFamily)
		}
	}
	return &LocalPort{Description: desc, IP: ip, IPFamily: ipFamily, Port: port, Protocol: protocol}, nil
}