com.jt.flash.proxy.handler.ProxyBackendHandler.java Source code

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Here is the source code for com.jt.flash.proxy.handler.ProxyBackendHandler.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:
 *
 *   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.jt.flash.proxy.handler;

import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.http.DefaultHttpResponse;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ProxyBackendHandler extends ChannelInboundHandlerAdapter {

    private final Channel inboundChannel;

    private static final Logger log = LoggerFactory.getLogger(ProxyBackendHandler.class);

    public ProxyBackendHandler(Channel inboundChannel) {
        this.inboundChannel = inboundChannel;
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        ctx.read();
    }

    /**
     * found a problem
     * if not close the channel, and the client would wait...
     * because response has multi resp
     * so add HttpObjectAggregator, and there would be one resp
     * and write this resp and add header close to let client close the connection
     *
     * I'm not found a good way to keep the connetion alive
     * @param ctx
     * @param msg
     */
    @Override
    public void channelRead(final ChannelHandlerContext ctx, Object msg) {
        log.info("back read msg {}", msg);
        if (msg instanceof FullHttpResponse) {
            FullHttpResponse response = (FullHttpResponse) msg;
            response.headers().add(HttpHeaders.Names.CONNECTION, HttpHeaders.Values.CLOSE);
        }
        inboundChannel.writeAndFlush(msg);
        //.addListener(ChannelFutureListener.CLOSE);
        //ctx.close();
        /*
            .addListener(new ChannelFutureListener() {
        @Override
        public void operationComplete(ChannelFuture future) {
            if (future.isSuccess()) {
                ctx.channel().read();
            } else {
                future.channel().close();
            }
        }
                });*/
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        inboundChannel.closeFuture();
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) {
        ProxyFrontendHandler.closeOnFlush(inboundChannel);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        ProxyFrontendHandler.closeOnFlush(ctx.channel());
    }
}