com.netflix.netty.common.proxyprotocol.OptionalHAProxyMessageDecoder Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of zuul-core Show documentation

zuul-core

There is a newer version: 2.5.13

/*
 * Copyright 2018 Netflix, Inc.
 *
 *      Licensed 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
 *
 *          http://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 com.netflix.netty.common.proxyprotocol;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.ProtocolDetectionResult;
import io.netty.handler.codec.ProtocolDetectionState;
import io.netty.handler.codec.haproxy.HAProxyMessageDecoder;
import io.netty.handler.codec.haproxy.HAProxyProtocolVersion;

/**
 * Chooses whether a new connection is prefixed with the ProxyProtocol from an ELB. If it is, then
 * it adds a HAProxyMessageDecoder into the pipeline after THIS handler.
 *
 * User: [email protected]
 * Date: 3/24/16
 * Time: 3:13 PM
 */
public class OptionalHAProxyMessageDecoder extends ChannelInboundHandlerAdapter
{
    public static final String NAME = "OptionalHAProxyMessageDecoder";

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception
    {
        if (msg instanceof ByteBuf) {
            ProtocolDetectionResult result = HAProxyMessageDecoder.detectProtocol((ByteBuf) msg);

            // TODO - is it possible that this message could be split over multiple ByteBufS, and therefore this would fail?
            if (result.state() == ProtocolDetectionState.DETECTED) {
                // Add the actual HAProxy decoder.
                // Note that the HAProxyMessageDecoder will remove itself once it has finished decoding the initial ProxyProtocol message(s).
                ctx.pipeline().addAfter(NAME, null, new HAProxyMessageDecoder());

                // Remove this handler, as now no longer needed.
                ctx.pipeline().remove(this);
            }
        }
        super.channelRead(ctx, msg);
    }
}