HAProxyTLV Class — netty Architecture

Source Code

codec-haproxy/src/main/java/io/netty/handler/codec/haproxy/HAProxyTLV.java lines 31–216

public class HAProxyTLV extends DefaultByteBufHolder {

    private final Type type;
    private final byte typeByteValue;

    /**
     * The size of this tlv in bytes.
     * @return the number of bytes.
     */
    int totalNumBytes() {
        return 3 + contentNumBytes(); // type(1) + length(2) + content
    }

    int contentNumBytes() {
        return content().readableBytes();
    }

    /**
     * The registered types a TLV can have regarding the PROXY protocol 1.5 spec
     */
    public enum Type {
        PP2_TYPE_ALPN,
        PP2_TYPE_AUTHORITY,
        PP2_TYPE_SSL,
        PP2_TYPE_SSL_VERSION,
        PP2_TYPE_SSL_CN,
        PP2_TYPE_NETNS,
        /**
         * A TLV type that is not officially defined in the spec. May be used for nonstandard TLVs
         */
        OTHER;

        /**
         * Returns the {@link Type} for a specific byte value as defined in the PROXY protocol 1.5 spec
         * <p>
         * If the byte value is not an official one, it will return {@link Type#OTHER}.
         *
         * @param byteValue the byte for a type
         *
         * @return the {@link Type} of a TLV
         */
        public static Type typeForByteValue(byte byteValue) {
            switch (byteValue) {
            case 0x01:
                return PP2_TYPE_ALPN;
            case 0x02:
                return PP2_TYPE_AUTHORITY;
            case 0x20:
                return PP2_TYPE_SSL;
            case 0x21:
                return PP2_TYPE_SSL_VERSION;
            case 0x22:
                return PP2_TYPE_SSL_CN;
            case 0x30:
                return PP2_TYPE_NETNS;
            default:
                return OTHER;
            }
        }

        /**
         * Returns the byte value for the {@link Type} as defined in the PROXY protocol 1.5 spec.
         *
         * @param type the {@link Type}
         *
         * @return the byte value of the {@link Type}.
         */
        public static byte byteValueForType(Type type) {
            switch (type) {
            case PP2_TYPE_ALPN:
                return 0x01;
            case PP2_TYPE_AUTHORITY:
                return 0x02;
            case PP2_TYPE_SSL:
                return 0x20;
            case PP2_TYPE_SSL_VERSION:
                return 0x21;
            case PP2_TYPE_SSL_CN:
                return 0x22;
            case PP2_TYPE_NETNS:
                return 0x30;