9e29c39daa
Motivation: In next major version of netty users should use ChannelHandler everywhere. We should ensure we do the same Modifications: Replace usage of deprecated classes / interfaces with ChannelHandler Result: Use non-deprecated code
100 lines
3.5 KiB
Java
100 lines
3.5 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.example.proxy;
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import io.netty.bootstrap.Bootstrap;
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import io.netty.buffer.Unpooled;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandler;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelOption;
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public class HexDumpProxyFrontendHandler implements ChannelHandler {
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private final String remoteHost;
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private final int remotePort;
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// As we use inboundChannel.eventLoop() when building the Bootstrap this does not need to be volatile as
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// the outboundChannel will use the same EventLoop (and therefore Thread) as the inboundChannel.
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private Channel outboundChannel;
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public HexDumpProxyFrontendHandler(String remoteHost, int remotePort) {
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this.remoteHost = remoteHost;
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this.remotePort = remotePort;
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}
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@Override
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public void channelActive(ChannelHandlerContext ctx) {
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final Channel inboundChannel = ctx.channel();
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// Start the connection attempt.
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Bootstrap b = new Bootstrap();
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b.group(inboundChannel.eventLoop())
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.channel(ctx.channel().getClass())
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.handler(new HexDumpProxyBackendHandler(inboundChannel))
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.option(ChannelOption.AUTO_READ, false);
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ChannelFuture f = b.connect(remoteHost, remotePort);
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outboundChannel = f.channel();
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f.addListener((ChannelFutureListener) future -> {
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if (future.isSuccess()) {
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// connection complete start to read first data
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inboundChannel.read();
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} else {
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// Close the connection if the connection attempt has failed.
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inboundChannel.close();
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}
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});
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}
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@Override
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public void channelRead(final ChannelHandlerContext ctx, Object msg) {
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if (outboundChannel.isActive()) {
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outboundChannel.writeAndFlush(msg).addListener((ChannelFutureListener) future -> {
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if (future.isSuccess()) {
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// was able to flush out data, start to read the next chunk
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ctx.channel().read();
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} else {
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future.channel().close();
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}
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});
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}
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}
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@Override
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public void channelInactive(ChannelHandlerContext ctx) {
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if (outboundChannel != null) {
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closeOnFlush(outboundChannel);
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}
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
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cause.printStackTrace();
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closeOnFlush(ctx.channel());
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}
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/**
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* Closes the specified channel after all queued write requests are flushed.
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*/
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static void closeOnFlush(Channel ch) {
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if (ch.isActive()) {
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ch.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
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}
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}
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}
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