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.
92 lines
4.1 KiB
Java
92 lines
4.1 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.socksproxy;
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import io.netty.bootstrap.Bootstrap;
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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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import io.netty.channel.SimpleChannelInboundHandler;
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import io.netty.channel.socket.nio.NioSocketChannel;
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import io.netty.handler.codec.socks.SocksCmdRequest;
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import io.netty.handler.codec.socks.SocksCmdResponse;
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import io.netty.handler.codec.socks.SocksCmdStatus;
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import io.netty.util.concurrent.Future;
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import io.netty.util.concurrent.GenericFutureListener;
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import io.netty.util.concurrent.Promise;
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@ChannelHandler.Sharable
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public final class SocksServerConnectHandler extends SimpleChannelInboundHandler<SocksCmdRequest> {
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private final Bootstrap b = new Bootstrap();
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@Override
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public void channelRead0(final ChannelHandlerContext ctx, final SocksCmdRequest request) throws Exception {
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Promise<Channel> promise = ctx.executor().newPromise();
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promise.addListener(
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new GenericFutureListener<Future<Channel>>() {
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@Override
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public void operationComplete(final Future<Channel> future) throws Exception {
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final Channel outboundChannel = future.getNow();
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if (future.isSuccess()) {
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ctx.channel().writeAndFlush(new SocksCmdResponse(SocksCmdStatus.SUCCESS, request.addressType()))
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.addListener(new ChannelFutureListener() {
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@Override
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public void operationComplete(ChannelFuture channelFuture) {
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ctx.pipeline().remove(SocksServerConnectHandler.this);
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outboundChannel.pipeline().addLast(new RelayHandler(ctx.channel()));
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ctx.pipeline().addLast(new RelayHandler(outboundChannel));
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}
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});
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} else {
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ctx.channel().writeAndFlush(new SocksCmdResponse(SocksCmdStatus.FAILURE, request.addressType()));
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SocksServerUtils.closeOnFlush(ctx.channel());
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}
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}
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});
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final Channel inboundChannel = ctx.channel();
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b.group(inboundChannel.eventLoop())
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.channel(NioSocketChannel.class)
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.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000)
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.option(ChannelOption.SO_KEEPALIVE, true)
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.handler(new DirectClientHandler(promise));
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b.connect(request.host(), request.port()).addListener(new ChannelFutureListener() {
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@Override
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public void operationComplete(ChannelFuture future) throws Exception {
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if (future.isSuccess()) {
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// Connection established use handler provided results
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} else {
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// Close the connection if the connection attempt has failed.
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ctx.channel().writeAndFlush(
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new SocksCmdResponse(SocksCmdStatus.FAILURE, request.addressType()));
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SocksServerUtils.closeOnFlush(ctx.channel());
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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 exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
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SocksServerUtils.closeOnFlush(ctx.channel());
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}
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}
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