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Posted to notifications@dubbo.apache.org by "zonghaishang (GitHub)" <gi...@apache.org> on 2020/03/09 13:34:02 UTC
[GitHub] [dubbo-go-hessian2] zonghaishang opened issue #163: 支持解码dubbo服务调用attachment
### 背景
在service mesh场景中，使用hessian-go作为序列化框架，需要解析dubbo请求body中的attachment（里面包含group）。因为attachment在body中方法参数字节后面，所以需要先解析dubbo请求中的参数类型和参数值，然后才能去解析到attachemt。
**What happened**:
目前发现解析attachment之前，先解析方法的参数类型和参数值报错了。类似参数类型解析不到go对应的类型：`can not find go type name com.raycloud.notify.api.domain.StopNotifyJob in registry`.
因为请求的参数类型，是java应用发到service mesh的，因此service mesh无法提前注册`StopNotifyJob`类型，并且也无法知道它的类型。
**What you expected to happen**:
类似java的hessian序列化行为，如果反序列化类型找不到(比如是class类型)，可以降级为hashmap(对应golang里面的map或者sync.Map). 这样参数解析完之后，也能解析到attachment。
**How to reproduce it (as minimally and precisely as possible)**:
这个是真实线上java(dubbo 2.4.9)调用mesh的二进制字节流：
```
bytes := []byte{
///**0000**/0x00, 0x00, 0x00, 0x01, 0x00, 0x06, 0x0a, 0x58, 0x0a, 0x04, 0x06, 0x01, 0x00, 0x00, 0x08, 0x00,
///**0010**/0x45, 0x00, 0x02, 0x3f, 0x4a, 0x68, 0x40, 0x00, 0x3f, 0x06, 0x68, 0x77, 0xc0, 0xa8, 0xb5, 0xe6,
///**0020**/0x0a, 0x04, 0x06, 0x47, 0xa5, 0xae, 0x78, 0x50, 0x83, 0x85, 0xf3, 0x81, 0xef, 0xf7, 0xd1, 0x21,
///**0030**/0x80, 0x18, 0x00, 0xe5, 0xbd, 0x80, 0x00, 0x00, 0x01, 0x01, 0x08, 0x0a, 0x3f, 0x3d, 0x72, 0x74,
/**0040**//*0x12, 0x16, 0x03, 0x56, */0xda, 0xbb, 0xc2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x4c,
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}
```
**Anything else we need to know?**:
[ Full content available at: https://github.com/apache/dubbo-go-hessian2/issues/163 ]
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[GitHub] [dubbo-go-hessian2] zonghaishang commented on issue #163: 支持解码dubbo服务调用attachment
Posted by "zonghaishang (GitHub)" <gi...@apache.org>.
项目依赖hessian2的基线：
digest = "1:f4be968368b6c78a68a439d7ef71c782b7036d185925e4dd1d2d6e773dcc59c3"
name = "github.com/apache/dubbo-go-hessian2"
packages = [
".",
"java_exception",
]
pruneopts = "UT"
revision = "0ef010e9ccf4fea50b122e43ba2c0ba62a260fcb"
version = "v1.3.0"
[ Full content available at: https://github.com/apache/dubbo-go-hessian2/issues/163 ]
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