網絡編碼解碼器編碼器錯誤

Question

我有以下問題。 每次我使用相同的編碼器和解碼器將數據包從客戶端發送到服務器時，在服務器控制台中都會出現以下錯誤：

    io.netty.handler.codec.DecoderException: java.lang.IndexOutOfBoundsException: readerIndex(72) + length(8) exceeds writerIndex(77): UnpooledByteBufAllocator$InstrumentedUnpooledUnsafeNoCleanerDirectByteBuf(ridx: 72, widx: 77, cap: 1024)
        at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:461)
        at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:267)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:356)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:342)
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:335)
        at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1294)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:356)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:342)
        at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:911)
        at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
        at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:645)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
        at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:131)
        at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IndexOutOfBoundsException: readerIndex(72) + length(8) exceeds writerIndex(77): UnpooledByteBufAllocator$InstrumentedUnpooledUnsafeNoCleanerDirectByteBuf(ridx: 72, widx: 77, cap: 1024)
        at io.netty.buffer.AbstractByteBuf.checkReadableBytes0(AbstractByteBuf.java:1168)
        at io.netty.buffer.AbstractByteBuf.readLong(AbstractByteBuf.java:651)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:27)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:491)
        at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:430)
        ... 16 more

我的來源看起來像這樣：

編碼器：

import net.rinet.rnclo.network.Packet;
import net.rinet.rnclo.network.PacketRegistry;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;

/**
 * JavaDoc this file!
 *
 * @author Pascal
 * @version 29.10.2017
 */
@AllArgsConstructor
@NoArgsConstructor
public class PacketEncoder extends MessageToByteEncoder<Packet> {
    private PacketRegistry packetRegistry;

    @Override
    protected void encode(ChannelHandlerContext ctx, Packet packet, ByteBuf output) throws Exception {
        long id = this.packetRegistry.getPacketIdByClass(packet.getClass());
        output.writeLong(id);
        packet.write(output);
    }
}

我的解碼器看起來像這樣：

package net.rinet.rnclo.network.encoding;

import net.rinet.rnclo.network.Packet;
import net.rinet.rnclo.network.PacketRegistry;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;

import java.util.List;

/**
 * JavaDoc this file!
 *
 * @author Pascal
 * @version 29.10.2017
 */
@AllArgsConstructor
@NoArgsConstructor
public class PacketDecoder extends ByteToMessageDecoder {
    private PacketRegistry packetRegistry;

    @Override
    public void decode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> outputList) throws Exception {
        if(byteBuf.isReadable(2)) {
            long id = byteBuf.readLong();

            if(packetRegistry.checkPacketId(id)) {
                Class<? extends Packet> packetClass = packetRegistry.getPacketClassById(id);
                Packet receivedPacket = packetClass.newInstance();
                try {
                    receivedPacket.read(byteBuf);
                } catch (Throwable t) {
                    t.printStackTrace();
                }
                outputList.add(receivedPacket);
            } else {
                decode(channelHandlerContext, byteBuf, outputList);
            }
        }
    }
}

我的數據包看起來像這樣： https : //hastebin.com/atirenevuw.java

對於每一個有用的答案，我都感到非常高興！ 帕斯卡

Answer 1

您正在檢查是否可以讀取2個字節，但隨后讀取了8個字節。

改變這個

        if(byteBuf.isReadable(2)) {
            long id = byteBuf.readLong();

至

        if(byteBuf.isReadable(8)) {
            long id = byteBuf.readLong();