HAProxyMessageEncoder.java — netty Source File

Source Code

/*
 * Copyright 2020 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.handler.codec.haproxy;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;
import io.netty.util.CharsetUtil;
import io.netty.util.NetUtil;

import java.util.List;

import static io.netty.handler.codec.haproxy.HAProxyConstants.*;

/**
 * Encodes an HAProxy proxy protocol message
 *
 * @see <a href="https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt">Proxy Protocol Specification</a>
 */
@Sharable
public final class HAProxyMessageEncoder extends MessageToByteEncoder<HAProxyMessage> {

    private static final int V2_VERSION_BITMASK = 0x02 << 4;

    // Length for source/destination addresses for the UNIX family must be 108 bytes each.
    static final int UNIX_ADDRESS_BYTES_LENGTH = 108;
    static final int TOTAL_UNIX_ADDRESS_BYTES_LENGTH = UNIX_ADDRESS_BYTES_LENGTH * 2;

    public static final HAProxyMessageEncoder INSTANCE = new HAProxyMessageEncoder();

    private HAProxyMessageEncoder() {
        super(HAProxyMessage.class);
    }

    @Override
    protected void encode(ChannelHandlerContext ctx, HAProxyMessage msg, ByteBuf out) throws Exception {
        switch (msg.protocolVersion()) {
            case V1:
                encodeV1(msg, out);
                break;
            case V2:
                encodeV2(msg, out);
                break;
            default:
                throw new HAProxyProtocolException("Unsupported version: " + msg.protocolVersion());
        }
// ... (76 more lines)