netty高性能http服务

猪眼睛 — Sat, 23 Nov 2013 07:54:00 GMT

netty是一套高性能的通讯架构，这里我用netty实现http服务器实现信息采集功能。主要是利用他现有的hander处理器，解析出request头，做信息采集使用，重写了他自己的hander.

package io.netty.example.http.snoop;

import static io.netty.handler.codec.http.HttpHeaders.getHost;
import static io.netty.handler.codec.http.HttpHeaders.isKeepAlive;
import static io.netty.handler.codec.http.HttpHeaders.Names.CONNECTION;
import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_LENGTH;
import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_TYPE;
import static io.netty.handler.codec.http.HttpHeaders.Names.COOKIE;
import static io.netty.handler.codec.http.HttpHeaders.Names.SET_COOKIE;
import static io.netty.handler.codec.http.HttpResponseStatus.BAD_REQUEST;
import static io.netty.handler.codec.http.HttpResponseStatus.OK;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;

import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.Cookie;
import io.netty.handler.codec.http.CookieDecoder;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpContent;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpObject;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.LastHttpContent;
import io.netty.handler.codec.http.QueryStringDecoder;
import io.netty.handler.codec.http.ServerCookieEncoder;
import io.netty.util.CharsetUtil;

public class HttpSnoopServiceTxt extends SimpleChannelInboundHandler {

   private HttpRequest request;
   /** Buffer that stores the response content */
   private final StringBuilder buf = new StringBuilder();

   @Override
   protected void channelRead0(ChannelHandlerContext ctx, Object msg)
           throws Exception {
       // TODO Auto-generated method stub
       if (msg instanceof HttpRequest) {
           HttpRequest request = this.request = (HttpRequest) msg;
           buf.setLength(0);
           // hostname
           buf.append("HOSTNAME:").append(getHost(request, "unknown"));
           // url
           buf.append("REQUEST_URI:").append(request.getUri());
           // parm
           QueryStringDecoder queryStringDecoder = new QueryStringDecoder(request.getUri());
           Map> params = queryStringDecoder.parameters();
           if (!params.isEmpty()) {
               for (Entry> p : params.entrySet()) {
                   String key = p.getKey();
                   List vals = p.getValue();
                   for (String val : vals) {
                       buf.append("PARAM:").append(key).append("=")
                               .append(val);
                   }
               }
           }
           //cookie

       }
       if (msg instanceof HttpContent) {
           if (msg instanceof LastHttpContent) {
               LastHttpContent trailer = (LastHttpContent) msg;
               writeResponse(trailer, ctx);
               WriterFile.printtxt(buf.toString());
           }
       }
   }

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

   private boolean writeResponse(HttpObject currentObj,ChannelHandlerContext ctx) {
       boolean keepAlive = isKeepAlive(request);
       FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1,
               currentObj.getDecoderResult().isSuccess() ? OK : BAD_REQUEST,
               Unpooled.copiedBuffer(buf.toString(), CharsetUtil.UTF_8));
       response.headers().set(CONTENT_TYPE, "text/plain; charset=UTF-8");
       if (keepAlive) {
           response.headers().set(CONTENT_LENGTH,
                   response.content().readableBytes());
           response.headers().set(CONNECTION, HttpHeaders.Values.KEEP_ALIVE);
       }
       ctx.write(response);
       return keepAlive;
   }

}

/*
* 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 io.netty.example.http.snoop;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;

/**
* An HTTP server that sends back the content of the received HTTP request
* in a pretty plaintext form.
*/
public class HttpSnoopServer {

    private final int port;

    public HttpSnoopServer(int port) {
        this.port = port;
    }

    public void run() throws Exception {
        // Configure the server.
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup, workerGroup)
             .channel(NioServerSocketChannel.class)
             .childHandler(new HttpSnoopServerInitializer());

            Channel ch = b.bind(port).sync().channel();
            ch.closeFuture().sync();
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }

    public static void main(String[] args) throws Exception {
        int port;
        if (args.length > 0) {
            port = 8080;
        } else {
            port = 8080;
        }
        new HttpSnoopServer(port).run();
    }
}

/*
* 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 io.netty.example.http.snoop;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;

public class HttpSnoopServerInitializer extends ChannelInitializer {
    @Override
    public void initChannel(SocketChannel ch) throws Exception {
        // Create a default pipeline implementation.
        ChannelPipeline p = ch.pipeline();

        // Uncomment the following line if you want HTTPS
        //SSLEngine engine = SecureChatSslContextFactory.getServerContext().createSSLEngine();
        //engine.setUseClientMode(false);
        //p.addLast("ssl", new SslHandler(engine));

        p.addLast("decoder", new HttpRequestDecoder());
        // Uncomment the following line if you don't want to handle HttpChunks.
        //p.addLast("aggregator", new HttpObjectAggregator(1048576));
        p.addLast("encoder", new HttpResponseEncoder());
        // Remove the following line if you don't want automatic content compression.
        //p.addLast("deflater", new HttpContentCompressor());

        p.addLast("handler", new HttpSnoopServiceTxt());
        //p.addLast("handler", new HttpSnoopServerHandler());
    }
}

猪眼睛 2013-11-23 15:54 发表评论

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netty高性能http服务