HttpServerConnectHandler.java
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/*
* Copyright 2012 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 cc.leevi.common.httpproxy;
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelOption;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import io.netty.util.concurrent.Promise;
@ChannelHandler.Sharable
public final class HttpServerConnectHandler extends SimpleChannelInboundHandler<HttpProxyRequestHead> {
private final Bootstrap b = new Bootstrap();
@Override
public void channelRead0(final ChannelHandlerContext ctx, final HttpProxyRequestHead requestHead) throws Exception {
Promise<Channel> promise = ctx.executor().newPromise();
final Channel inboundChannel = ctx.channel();
promise.addListener(
new FutureListener<Channel>() {
@Override
public void operationComplete(final Future<Channel> future) throws Exception {
final Channel outboundChannel = future.getNow();
if (future.isSuccess()) {
ChannelFuture responseFuture;
if("TUNNEL".equals(requestHead.getProxyType())){
responseFuture = inboundChannel.writeAndFlush(Unpooled.wrappedBuffer((requestHead.getProtocolVersion() + " 200 Connection Established\r\n\r\n").getBytes()));
}else if("WEB".equals(requestHead.getProxyType())){
responseFuture = outboundChannel.writeAndFlush(requestHead.getByteBuf());
}else{
HttpServerUtils.closeOnFlush(inboundChannel);
return;
}
responseFuture.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture channelFuture) {
ctx.pipeline().remove(HttpServerConnectHandler.this);
outboundChannel.pipeline().addLast(new RelayHandler(inboundChannel));
ctx.pipeline().addLast(new RelayHandler(outboundChannel));
}
});
} else {
HttpServerUtils.closeOnFlush(inboundChannel);
}
}
});
b.group(inboundChannel.eventLoop())
.channel(NioSocketChannel.class)
.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000)
.option(ChannelOption.SO_KEEPALIVE, true)
.handler(new DirectClientHandler(promise));
b.connect(requestHead.getHost(), requestHead.getPort()).addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
if (future.isSuccess()) {
// Connection established use handler provided results
} else {
// Close the connection if the connection attempt has failed.
HttpServerUtils.closeOnFlush(inboundChannel);
}
}
});
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
HttpServerUtils.closeOnFlush(ctx.channel());
}
}