private static String getLocalAddress()

in mqtt-common/src/main/java/org/apache/rocketmq/mqtt/common/meta/IpUtil.java [44:78]

32 lines of code
10 McCabe index (conditional complexity)


    private static String getLocalAddress() throws Exception {
        Enumeration<NetworkInterface> enumeration = NetworkInterface.getNetworkInterfaces();
        ArrayList<String> ipv4Result = new ArrayList<String>();
        ArrayList<String> ipv6Result = new ArrayList<String>();
        while (enumeration.hasMoreElements()) {
            final NetworkInterface networkInterface = enumeration.nextElement();
            final Enumeration<InetAddress> en = networkInterface.getInetAddresses();
            while (en.hasMoreElements()) {
                final InetAddress address = en.nextElement();
                if (!address.isLoopbackAddress()) {
                    if (address instanceof Inet6Address) {
                        ipv6Result.add(normalizeHostAddress(address));
                    } else {
                        ipv4Result.add(normalizeHostAddress(address));
                    }
                }
            }
        }

        if (!ipv4Result.isEmpty()) {
            for (String ip : ipv4Result) {
                if (ip.startsWith("127.0") || ip.startsWith("192.168")) {
                    continue;
                }

                return ip;
            }

            return ipv4Result.get(ipv4Result.size() - 1);
        } else if (!ipv6Result.isEmpty()) {
            return ipv6Result.get(0);
        }
        final InetAddress localHost = InetAddress.getLocalHost();
        return normalizeHostAddress(localHost);
    }