223efc5f99
Motivation: The examples have not been updated since long time ago, showing various issues fixed in this commit. Modifications: - Overall simplification to reduce LoC - Use system properties to get options instead of parsing args. - Minimize option validation - Just use System.out/err instead of Logger - Do not pass config as parameters - just access it directly - Move the main logic to main(String[]) instead of creating a new instance meaninglessly - Update netty-build-21 to make checkstyle not complain - Remove 'throws Exception' clause if possible - Line wrap at 120 (previously at 80) - Add an option to enable SSL for most examples - Use ChannelFuture.sync() instead of await() - Use System.out for the actual result. Use System.err otherwise. - Delete examples that are not very useful: - applet - websocket/html5 - websocketx/sslserver - localecho/multithreaded - Add run-example.sh which simplifies launching an example from command line - Rewrite FileServer example Result: Shorter and simpler examples. A user can focus more on what it actually does than miscellaneous stuff. A user can launch an example very easily.
104 lines
3.5 KiB
Java
104 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.ChannelHandlerContext;
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import io.netty.channel.ChannelInboundHandlerAdapter;
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import io.netty.channel.ChannelOption;
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public class HexDumpProxyFrontendHandler extends ChannelInboundHandlerAdapter {
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private final String remoteHost;
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private final int remotePort;
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private volatile 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(new ChannelFutureListener() {
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@Override
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public void operationComplete(ChannelFuture 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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}
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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(new ChannelFutureListener() {
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@Override
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public void operationComplete(ChannelFuture 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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}
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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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