dubbo 协议

encode
one to one
org.jboss.netty.handler.codec.oneone.OneToOneEncoder

com.alibaba.dubbo.remoting.transport.netty.NettyCodecAdapter.InternalEncoder

org.jboss.netty.handler.codec.base64.Base64Encoder
org.jboss.netty.handler.codec.marshalling.CompatibleMarshallingEncoder
org.jboss.netty.handler.codec.serialization.CompatibleObjectEncoder
org.jboss.netty.handler.codec.http.HttpClientCodec.Encoder
org.jboss.netty.handler.codec.http.HttpMessageEncoder
org.jboss.netty.handler.codec.http.HttpRequestEncoder
org.jboss.netty.handler.codec.http.HttpResponseEncoder
org.jboss.netty.handler.codec.compression.JdkZlibEncoder
org.jboss.netty.handler.codec.frame.LengthFieldPrepender
org.jboss.netty.handler.codec.marshalling.MarshallingEncoder
org.jboss.netty.handler.codec.serialization.ObjectEncoder
org.jboss.netty.handler.codec.oneone.OneToOneStrictEncoder
org.jboss.netty.handler.codec.protobuf.ProtobufEncoder
org.jboss.netty.handler.codec.protobuf.ProtobufVarint32LengthFieldPrepender
org.jboss.resteasy.plugins.server.netty.RestEasyHttpResponseEncoder
org.jboss.netty.handler.codec.rtsp.RtspMessageEncoder
org.jboss.netty.handler.codec.rtsp.RtspRequestEncoder
org.jboss.netty.handler.codec.rtsp.RtspResponseEncoder
org.jboss.netty.handler.codec.socks.SocksMessageEncoder
org.jboss.netty.handler.codec.string.StringEncoder
org.jboss.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder
org.jboss.netty.handler.codec.http.websocketx.WebSocket07FrameEncoder
org.jboss.netty.handler.codec.http.websocketx.WebSocket08FrameEncoder
org.jboss.netty.handler.codec.http.websocketx.WebSocket13FrameEncoder
org.jboss.netty.handler.codec.http.websocket.WebSocketFrameEncoder
org.jboss.netty.handler.codec.compression.ZlibEncoder




codec
com.alibaba.dubbo.remoting.Codec2

com.alibaba.dubbo.remoting.transport.AbstractCodec
com.alibaba.dubbo.remoting.transport.codec.CodecAdapter
com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec
com.alibaba.dubbo.rpc.protocol.dubbo.DubboCountCodec
com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec
com.alibaba.dubbo.remoting.telnet.codec.TelnetCodec
com.alibaba.dubbo.rpc.protocol.thrift.ThriftCodec
com.alibaba.dubbo.rpc.protocol.thrift.ThriftNativeCodec
com.alibaba.dubbo.remoting.transport.codec.TransportCodec









com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec

<16 bytes header><n bytes body>

头部
<2 bytes magic><1 byte 消息类型标志 or serialization content-type-id><1 byte reserved><8 bytes 消息Id><4 bytes 消息长度>

魔数
0xdabb

body
<n bytes dubbo version><n bytes path><n bytes version><n bytes method name><4 bytes -> -1 | 4 bytes argument types length | n bytes argument types><n bytes arguments><n bytes attachments>


dubbo version // 2.0.0
<1 byte> -> 128
<1 byte> -> 129
<n bytes dubbo version> // 不记录长度，1<字符串长度<64 并且 其中的每一个字符都在ascii字母表范围中。
<1 byte dubbo version length><n bytes dubbo version>
<2 byte dubbo version length><n bytes dubbo version>
<3 byte dubbo version length><n bytes dubbo version>
<4 byte dubbo version length><n bytes dubbo version>
<5 byte dubbo version length><n bytes dubbo version>

path // com.alibaba.dubbo.demo.TestService

version //

argument types //
例如： I, J, F, D, V, [I, [J, [F, [D, [V, Ljava/lang/String;, [Ljava/lang/String;, Ljava/lang/String;[J, ... ...

消息长度
body长度







com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec

<16 bytes header><n bytes body>

头部
<2 bytes magic><1 byte 消息类型标志 or serialization content-type-id><1 byte reserved><8 bytes 消息Id><4 bytes 消息长度>

魔数
0xdabb

body
<n bytes dubbo version><n bytes path><n bytes version><n bytes method name><4 bytes -> -1 | 4 bytes argument types length | n bytes argument types><n bytes arguments><n bytes attachments>


dubbo version // 2.0.0
<1 byte> -> 128
<1 byte> -> 129
<n bytes dubbo version> // 不记录长度，1<字符串长度<64 并且 其中的每一个字符都在ascii字母表范围中。
<1 byte dubbo version length><n bytes dubbo version>
<2 byte dubbo version length><n bytes dubbo version>
<3 byte dubbo version length><n bytes dubbo version>
<4 byte dubbo version length><n bytes dubbo version>
<5 byte dubbo version length><n bytes dubbo version>

path // com.alibaba.dubbo.demo.TestService

version //

argument types //
例如： I, J, F, D, V, [I, [J, [F, [D, [V, Ljava/lang/String;, [Ljava/lang/String;, Ljava/lang/String;[J, ... ...

消息长度
body长度




payload

Data length too large: 241, max payload: 8388608, channel: NettyChannel [channel=[id: 0xf777da5d, /192.168.1.10:54085 :> /192.168.1.10:20880]]




消息类型标志



消息类型 FLAG
REQUEST 0x80 1000 0000
TWOWAY 0x40 0100 0000
EVENT 0x20 0010 0000




com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec



序列化
com.alibaba.dubbo.common.serialize.Serialization

com.alibaba.dubbo.common.serialize.support.kryo.KryoSerialization



META-INF/dubbo/internal/com.alibaba.dubbo.common.serialize.Serialization

dubbo=com.alibaba.dubbo.common.serialize.support.dubbo.DubboSerialization
hessian2=com.alibaba.dubbo.common.serialize.support.hessian.Hessian2Serialization
java=com.alibaba.dubbo.common.serialize.support.java.JavaSerialization
compactedjava=com.alibaba.dubbo.common.serialize.support.java.CompactedJavaSerialization
json=com.alibaba.dubbo.common.serialize.support.json.JsonSerialization
fastjson=com.alibaba.dubbo.common.serialize.support.json.FastJsonSerialization
nativejava=com.alibaba.dubbo.common.serialize.support.nativejava.NativeJavaSerialization
kryo=com.alibaba.dubbo.common.serialize.support.kryo.KryoSerialization
fst=com.alibaba.dubbo.common.serialize.support.fst.FstSerialization
jackson=com.alibaba.dubbo.common.serialize.support.json.JacksonSerialization




Serialization Content-Type







Content-Type Content-Type-Id Serialization
dubbo x-application/dubbo 1 DubboSerialization
hessian2 x-application/hessian2 2 Hessian2Serialization
java x-application/java 3 JavaSerialization
compactedjava x-application/compactedjava 4 CompactedJavaSerialization
json text/json 5 JsonSerialization
fastjson text/json 6 FastJsonSerialization
nativejava x-application/nativejava 7 NativeJavaSerialization
kryo x-application/kryo 8 KryoSerialization
fst x-application/fst 9 FstSerialization
jackson text/json 20 JacksonSerialization


Java序列化机制实现：参考https://lobin.iteye.com/blog/629414序列化章节。