redission自定义hessian序列化

一。技术改造背景

由于之前的比较陈旧的技术，后面发起了技术改造，redis整体改后使用redisson框架。

二。问题

改造完成后，使用方反馈缓存获取异常异常信息如下

Caused by: java.io.CharConversionException: Unexpected EOF in the middle of a 4-byte UTF-32 char: got 1, needed 4, at char #1, byte #5)
at com.fasterxml.jackson.core.io.UTF32Reader.reportUnexpectedEOF(UTF32Reader.java:187)
at com.fasterxml.jackson.core.io.UTF32Reader.loadMore(UTF32Reader.java:248)
at com.fasterxml.jackson.core.io.UTF32Reader.read(UTF32Reader.java:126)
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._loadMore(ReaderBasedJsonParser.java:276)
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._matchToken2(ReaderBasedJsonParser.java:2727)
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._matchToken(ReaderBasedJsonParser.java:2707)
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._handleOddValue(ReaderBasedJsonParser.java:1986)
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.nextToken(ReaderBasedJsonParser.java:802)
at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:4761)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4667)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3666)
at org.redisson.codec.JsonJacksonCodec$2.decode(JsonJacksonCodec.java:99)
at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:393)
at org.redisson.client.handler.CommandDecoder.decodeCommand(CommandDecoder.java:205)
at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:144)
at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:120)
at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:519)
at io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:366)

三。问题定位

从日志上来看解密失败了，回头看未改造的redis 存储的序列化方式是 hessian 而改造后的 redis存储的序列化方式是JsonJacksonCodec 导致反序列化报错

四。问题解决

具体问题定位到了后解决办法就已经有了。

修改redisson的序列化方式保持和旧的序列化方式相同
做缓存迁移或者缓存全量失效（理论来讲不太现实）

那这个很明显，选择修改redisson的序列化方式保持和旧的序列化方式相同。
redison目前支持的序列化方式

Codec class name	Description
`org.redisson.codec.Kryo5Codec`	Kryo 5 binary codec (Android compatible) Default codec
`org.redisson.codec.KryoCodec`	Kryo 4 binary codec
`org.redisson.codec.JsonJacksonCodec`	Jackson JSON codec. Stores type information in `@class` field (Android compatible)
`org.redisson.codec.TypedJsonJacksonCodec`	Jackson JSON codec which doesn’t store type id (`@class` field) during encoding and doesn’t require it for decoding
`org.redisson.codec.AvroJacksonCodec`	Avro binary json codec
`org.redisson.codec.SmileJacksonCodec`	Smile binary json codec
`org.redisson.codec.CborJacksonCodec`	CBOR binary json codec
`org.redisson.codec.MsgPackJacksonCodec`	MsgPack binary json codec
`org.redisson.codec.IonJacksonCodec`	Amazon Ion codec
`org.redisson.codec.SerializationCodec`	JDK Serialization binary codec (Android compatible)
`org.redisson.codec.LZ4Codec`	LZ4 compression codec. Uses `Kryo5Codec` for serialization by default
`org.redisson.codec.SnappyCodecV2`	Snappy compression codec based on snappy-java project. Uses `Kryo5Codec` for serialization by default
`org.redisson.codec.MarshallingCodec`	JBoss Marshalling binary codec Deprecated!
`org.redisson.client.codec.StringCodec`	String codec
`org.redisson.client.codec.LongCodec`	Long codec
`org.redisson.client.codec.ByteArrayCodec`	Byte array codec
`org.redisson.codec.CompositeCodec`	Allows to mix different codecs as one

很意外并没有我们需要的hessian的序列化只能手写! redisson 默认的序列化方式为Kryo5Codec

首先引入依赖

<dependency><groupId>com.caucho</groupId><artifactId>hessian</artifactId><version>4.0.66</version>
</dependency>

其次继承 BaseCodec 实现我们的 HessianCoder 即可完整的实现如下

import com.caucho.hessian.io.HessianInput;
import com.caucho.hessian.io.HessianOutput;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.ByteBufInputStream;
import io.netty.buffer.ByteBufOutputStream;
import lombok.extern.slf4j.Slf4j;
import org.redisson.client.codec.BaseCodec;
import org.redisson.client.handler.State;
import org.redisson.client.protocol.Decoder;
import org.redisson.client.protocol.Encoder;import java.io.IOException;/*** 自定义实现 Hessian 序列化 兼容原有的序列化方式** @author leon* @date 2023-08-10 15:14:03*/
@Slf4j
public class HessianCoder extends BaseCodec {private final Encoder encoder = new Encoder() {@Overridepublic ByteBuf encode(Object in) throws IOException {try (ByteBufOutputStream os = new ByteBufOutputStream(ByteBufAllocator.DEFAULT.buffer())) {HessianOutput ho = new HessianOutput(os);ho.writeObject(in);return os.buffer();} catch (Exception e) {log.error("Hessian序列化异常: {}", e.getMessage(), e);throw new IOException(e);}}};private final Decoder<Object> decoder = new Decoder<Object>() {@Overridepublic Object decode(ByteBuf buf, State state) throws IOException {try (ByteBufInputStream inputStream = new ByteBufInputStream(buf)) {HessianInput hi = new HessianInput(inputStream);return hi.readObject();} catch (Exception e) {log.error("Hessian反序列化异常: {}", e.getMessage(), e);throw new IOException(e);}}};@Overridepublic Decoder<Object> getValueDecoder() {return decoder;}@Overridepublic Encoder getValueEncoder() {return encoder;}
}