Netty大并发时出现解码错误

meoujb 2013-11-05 10:41:22
用netty写的一个网关服务器的验证,在并发数比较大的时候,就会出现解码的问题,各位帮忙看看,好几天了,一直没解决。

(1)每隔50ms生成一个客户端进行压测,客户端每隔1s发送200bytes的数据,服务器收到后,将其加入到队列中。

(2)另开一个线程处理队列,目前是简单的将其发给客户端。

(3)客户端收到服务器的消息后,也是将其加入到队列中,由另外一个线程进行处理,将消息发送时间和接收时间记录到文件中。

协议:
包体长度+包体
包体使用的是一个map,数据格式定义:
* 字段1键名长度 字段1键名 字段1值长度 字段1值
* 字段2键名长度 字段2键名 字段2值长度 字段2值
* 字段3键名长度 字段3键名 字段3值长度 字段3值
public class XLRequest {
private int length; // 数据包长

private Map<String,String> datas=new HashMap<String, String>(); //参数
。。。。。。。
}


编码:
public class MessageEncoder extends OneToOneEncoder  {

public void encodeDataBuffer(Map<String, String> values, ChannelBuffer totalBuffer) throws Exception {
if (values != null && values.size() > 0) {
for (Entry<String, String> entry : values.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
totalBuffer.writeInt(key.getBytes().length);
totalBuffer.writeBytes(key.getBytes());
totalBuffer.writeInt(value.getBytes().length);
totalBuffer.writeBytes(value.getBytes());
}
}
}

public int getDataLength(Map<String, String> values){
int dataLength = 0;
for (Entry<String, String> entry : values.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
dataLength = dataLength + 4 + key.getBytes().length + 4
+ value.getBytes().length;
}
return dataLength;
}

@Override
protected Object encode(ChannelHandlerContext ctx, Channel channel,
Object msg) throws Exception {
XLRequest request = (XLRequest) msg;
ChannelBuffer totalBuffer = ChannelBuffers.dynamicBuffer();

Map<String, String> datas = request.getDatas();
if(datas==null || datas.isEmpty()){
throw new Exception("内容为空!");
}
totalBuffer.writeInt(getDataLength(datas));

encodeDataBuffer(datas, totalBuffer);
return totalBuffer;
}
}


解码:
public class MessageDecoder extends FrameDecoder {
public static final Logger logger = LoggerFactory.getLogger(MessageDecoder.class);

@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel,
ChannelBuffer buffer) throws Exception {

if (buffer.readableBytes() < 4) {
return null;
}
buffer.markReaderIndex();
int totalLength = buffer.readInt(); // 数据包长

if (buffer.readableBytes() < totalLength) {
buffer.resetReaderIndex();
return null;
}
ChannelBuffer dataBuffer = ChannelBuffers.buffer(totalLength);
buffer.readBytes(dataBuffer, totalLength);

XLRequest request = new XLRequest();
request.setLength(totalLength);
request.setDatas(decodeDataBuffer(dataBuffer));
return request;
}

public Map<String, String> decodeDataBuffer(ChannelBuffer dataBuffer ) throws IOException, Exception {
Map<String, String> dataMap = new HashMap<String, String>();

if (dataBuffer != null && dataBuffer.readableBytes() > 0) {
int processIndex = 0;
int totalLength = dataBuffer.readableBytes();
while (processIndex < totalLength) {
/**
* 获取Key
*/
int size = dataBuffer.readInt();
byte[] contents = new byte[size];
dataBuffer.readBytes(contents);
String key = new String(contents);
processIndex = processIndex + size + 4;

/**
* 获取Value
*/

size = dataBuffer.readInt();
contents = new byte[size];
dataBuffer.readBytes(contents);
String value = new String(contents);

dataMap.put(key, value);
processIndex = processIndex + size + 4;
}
}
return dataMap;
}
}


ClientHandler:
public XLRequest createSendData(Integer channelId) {
XLRequest request = new XLRequest();
if(firstCreated){
msg2_1024bytes = formResponseMessage(2);
msg5_1024bytes = formResponseMessage(5);
msg10_1024bytes = formResponseMessage(10);
msg50_1024bytes = formResponseMessage(50);
firstCreated = false;
}
String msg = getMessage(ConfigUtil.SEND_BYTES);
request.setValue("msg", msg);
request.setValue("sid", lastSid.getAndIncrement()+"");
request.setValue("time", System.currentTimeMillis()+"");
return request;
}

@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent messageEvent)
throws Exception {
XLRequest request = (XLRequest) messageEvent.getMessage();

request.setValue("recvTime", System.currentTimeMillis()+"");
messageManager.addSocketMessage(messageManager.handleMessage(CommandType.CLIENT_REQUEST,
ctx.getChannel(), request));
}


@Override
public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e)
throws Exception {
Channel channel = ctx.getChannel();
if (channel != null) {
// send data
XLRequest clientRequest = createSendData(channel.getId());
ClientSenderThread senderThread = new ClientSenderThread(channel, clientRequest);
Thread thread = new Thread(senderThread);
thread.start();
}
super.channelConnected(ctx, e);
}


ClientFactory:
public class ClientFactory implements ChannelPipelineFactory {

private MessageDecoder messageDecoder = new MessageDecoder();
private MessageEncoder messageEncoder = new MessageEncoder();
private ClientHandler clientHandler = new ClientHandler();

ExecutionHandler executionHandler = new ExecutionHandler(
new OrderedMemoryAwareThreadPoolExecutor(
SysInfo.getProcessors()*ConfigUtil.GATEWAY_PROCESS,
ConfigUtil.MAX_CHANNEL_MEMORY_SIZE,
0)
);
public ChannelPipeline getPipeline() throws Exception {

ChannelPipeline cp = Channels.pipeline();
cp.addLast("messageClientDecoder", messageDecoder);
cp.addLast("messageClientEncoder", messageEncoder);
cp.addLast("executionHandler", executionHandler);
cp.addLast("clientHandler", clientHandler);
return cp;
}
}

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meoujb 2013-12-14
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public class GatewayFactory implements ChannelPipelineFactory { private MessageDecoder messageDecoder = new MessageDecoder(); private MessageEncoder messageEncoder = new MessageEncoder(); private GatewayMessageHandler gatewayMessageHandler = new GatewayMessageHandler(); ExecutionHandler executionHandler = new ExecutionHandler( new OrderedMemoryAwareThreadPoolExecutor( SysInfo.getProcessors()*ConfigUtil.GATEWAY_PROCESS, ConfigUtil.MAX_CHANNEL_MEMORY_SIZE, 0) ); public ChannelPipeline getPipeline() throws Exception { ChannelPipeline cp = Channels.pipeline(); cp.addLast("messageServerDecoder", messageDecoder); cp.addLast("messageServerEncoder", messageEncoder); cp.addLast("executionHandler", executionHandler); cp.addLast("gatewayMessageHandler", gatewayMessageHandler); return cp; } } 错误在这里,应该是每次都要NEW一个的,cp.addLast("messageServerDecoder", new messageDecoder())
SimonDW 2013-11-12
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MessageDecoder 的decodeDataBuffer里readInt前没对readableBytes检查。 考虑到Tcp分段问题,可能等整个消息到了之后再解码更好 另外 netty本身即有基于长度字段的decoder LengthFieldBasedFrameDecoder
meoujb 2013-11-05
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哎,眼看帖子就要沉下去了,来人啦。。。。
meoujb 2013-11-05
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引用 2 楼 shadowsick 的回复:
帮顶下吧...
小丑哥_V5 2013-11-05
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帮顶下吧...
meoujb 2013-11-05
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ServerHandler:
	@Override
	public void messageReceived(ChannelHandlerContext ctx, MessageEvent messageEvent)
			throws Exception {
		Channel sendChannel = ctx.getChannel();
		doProcessFromClient(ctx, messageEvent, sendChannel);
	}
	private void doProcessFromClient(ChannelHandlerContext ctx,
			MessageEvent messageEvent, Channel sendChannel) {
		XLRequest request = (XLRequest)messageEvent.getMessage();
		byte command = CommandType.GATE_TO_CLIENT_NORMAL;
		messageManager.addSocketMessage(messageManager.handleMessage(command, ctx.getChannel(), request));
	}
GateWayFactory:
public class GatewayFactory implements ChannelPipelineFactory {

	private MessageDecoder messageDecoder = new MessageDecoder();
	private MessageEncoder messageEncoder = new MessageEncoder();
	private GatewayMessageHandler gatewayMessageHandler = new GatewayMessageHandler();		
	ExecutionHandler executionHandler = new ExecutionHandler( 
			new OrderedMemoryAwareThreadPoolExecutor(
					SysInfo.getProcessors()*ConfigUtil.GATEWAY_PROCESS, 
					ConfigUtil.MAX_CHANNEL_MEMORY_SIZE, 
					0)
			);
	
	public ChannelPipeline getPipeline() throws Exception {
		ChannelPipeline cp = Channels.pipeline();
		cp.addLast("messageServerDecoder", messageDecoder);
		cp.addLast("messageServerEncoder", messageEncoder);
		cp.addLast("executionHandler", executionHandler);
		cp.addLast("gatewayMessageHandler", gatewayMessageHandler);
		return cp;
	}
	
}
消息队列:
public class MessageManager {
	
	public static final Logger logger = LoggerFactory.getLogger(MessageManager.class);

	/** MessageManager的消息队列,下面的addSocketMessage方法就是向这个队列塞MessagePack的*/
    private LinkedBlockingQueue<MessagePack> receivedQueen = new LinkedBlockingQueue<MessagePack>();
    private ExecutorService pool;
    
    
    /** 登记式单例类 */
    private static AtomicInteger instanceIndex = new AtomicInteger(0);
    private static Map<String, MessageManager> instanceMap = new HashMap<String, MessageManager>();
    private String instanceName = "";
    public static final String INSTANCE_CLIENT_TO_GATE = "client_to_gate";
    public static final String INSTANCE_GATE_TO_CLIENT = "gate_to_client";
    private MessageManager(String name){
    	this.instanceName = name;
    }
    public String getInstanceName() {
		return instanceName;
	}
	public static MessageManager getInstance(String name){
    	if(StringUtils.isBlank(name)){
    		name = MessageManager.class.getName().concat(instanceIndex.get()+"");
    		instanceIndex.getAndIncrement();
    	}
    	
    	synchronized (instanceMap) {
    		MessageManager instance = instanceMap.get(name);
        	if(instance==null){
        		instance = new MessageManager(name);
        		instanceMap.put(name, instance);
        	}
        	return instance;
		}
    }
	

    public MessagePack handleMessage(byte command, Channel sendChannel, XLRequest request) {
        MessagePack messagePack = null;

        switch (command) {
        case CommandType.GATE_TO_CLIENT_NORMAL: 
        	messagePack = new GateMessagePack(command, sendChannel, request);
        	break;
        case CommandType.CLIENT_REQUEST:
        	messagePack = new ClientMessagePack(command, sendChannel, request);
        }
        return messagePack;
    }

    public void start() {
    	pool = Executors.newFixedThreadPool(SysInfo.getProcessors()*2);
        for(int i=0;i<SysInfo.getProcessors();i++){
        	 pool.execute(new PushRecvThread());
        }
    }

	private class PushRecvThread implements Runnable {

		public void run() {
			while (true) {
				// 从队列中取继承MessagePack的实例
				MessagePack message;
				try {
					message = receivedQueen.poll(1, TimeUnit.MILLISECONDS);
					if (message != null) {
						message.onHandler();
					}
				} catch (InterruptedException e) {
					logger.error(e.getMessage(), e);
				}
			}
		}
	}
	public void addSocketMessage(MessagePack message) {
		if (message != null) {
			try {
				boolean success = receivedQueen.offer(message, 1,TimeUnit.MILLISECONDS);
			} catch (InterruptedException e) {
				logger.error(e.getMessage(), e);
			}
		}
	}
}
代码比较多,源代码我上传到百度网盘了,地址: http://pan.baidu.com/s/17Vbyg 7k用户每隔1s发送200byte数据的时候,就会出现如下的错误,而且还有个很奇怪的问题,在这7k用户建立连接的过程中,不会出现解码问题,全部建立连接后不久,就会出现解码问题。不知道是不是我写的代码有问题,各位大牛帮忙看看吧。
java.lang.IndexOutOfBoundsException: Not enough readable bytes - Need 4, maximum is 3
	at org.jboss.netty.buffer.AbstractChannelBuffer.checkReadableBytes(AbstractChannelBuffer.java:661)
	at org.jboss.netty.buffer.AbstractChannelBuffer.readInt(AbstractChannelBuffer.java:273)
	at com.zltx.game.sky.net.verify.MessageDecoder.decodeDataBuffer(MessageDecoder.java:51)
	at com.zltx.game.sky.net.verify.MessageDecoder.decode(MessageDecoder.java:37)
	at org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:425)
	at org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:310)
	at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
	at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
	at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:109)
	at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:312)
	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:90)
	at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
java.lang.IndexOutOfBoundsException: Not enough readable bytes - Need 825570103, maximum is 0
	at org.jboss.netty.buffer.AbstractChannelBuffer.checkReadableBytes(AbstractChannelBuffer.java:661)
	at org.jboss.netty.buffer.AbstractChannelBuffer.readBytes(AbstractChannelBuffer.java:338)
	at org.jboss.netty.buffer.AbstractChannelBuffer.readBytes(AbstractChannelBuffer.java:344)
	at com.zltx.game.sky.net.verify.MessageDecoder.decodeDataBuffer(MessageDecoder.java:53)
	at com.zltx.game.sky.net.verify.MessageDecoder.decode(MessageDecoder.java:37)
	at org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:425)
	at org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:310)
	at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
	at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
	at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:109)
	at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:312)
	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:90)
	at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
MiceRice 2013-11-05
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java.lang.IndexOutOfBoundsException: Not enough readable bytes - Need 4, maximum is 3 第一个错误看起来不像是什么错误,你要求读取4个字节,但实际上可读取的只有3个字节,也许是网络还没发送过来。 java.lang.IndexOutOfBoundsException: Not enough readable bytes - Need 825570103, maximum is 0 第二个错误比较离谱点,你要接受的数据居然有这么大?825MB?!是不是前面识别错误了? 建议用工具截取网络数据包,看看是不是发送跟接收处理跟预期的不一致。
93个netty并发全面的教学视频下载,每个视频在400-700M,一到两个小长的视频,无机器码和解压密码,下载下来的就是MP4格式视频。点击即可观看学习。下载txt文档,里面有永久分享的连接。包括01_学习的要义;02_Netty宏观理解;03_Netty课程大纲深度解读;04_项目环境搭建与Gradle配置;05_Netty执行流程分析与重要组件介绍;06_Netty回调与Channel执行流程分析;07_Netty的Socket编程详解;08_Netty多客户端连接与通信,09_Netty读写检测机制与长连接要素,10_Netty对WebSocket的支援;11_Netty实现服务器端与客户端的长连接通信;12_Google Protobuf详解;13_定义Protobuf文件及消息详解;14_Protobuf完整实例详解;15_Protobuf集成Netty与多协议消息传递;16_Protobuf多协议消息支援与工程最佳实践;17_Protobuf使用最佳实践与Apache Thrift介绍;18_Apache Thrift应用详解与实例剖析;19_Apache Thrift原理与架构解析;20_通过Apache Thrift实现Java与Python的RPC调用;21_gRPC深入详解 ;22_gRPC实践 ;23_Gradle Wrapper在Gradle项目构建中的最佳实践;24_gRPC整合Gradle与代码生成············82_Netty引用计数原子更新揭秘与AtomicIntegerFieldUpdater深度剖析;83_AtomicIntegerFieldUpdater实例演练与volatile关键字分析;84_Netty引用计数注意事项与内存泄露检测方式;85_Netty解码器剖析与入站出站处理器详解;86_Netty自定义编解码器与TCP粘包拆包问题;87_Netty解码器执行流程深入分析;88_ReplayingDecoder源码分析与特性解读;89_Netty常见且重要编解码器详解;90_TCP粘包与拆包实例演示及分析;91_Netty自定义协议与TCP粘包拆包问题解决之道;92_精通并发Netty课程总结与展望

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