msgpack代替json防止丢失类型

妙音 posted @ 2021年6月30日 15:12 in golang , 1697 阅读

描述

开发了一个通信协议, 协议对数据类型比较敏感, 根据不同数据数据类型使用不同格式。golang的数据类型能够满足需求。

然而，将协议转为http方式时，如果传入json，会发现数据类型不符合预期

例如，本来是应该int结果是float64; 本来应该是[]byte，结果是string

环境

http服务器: gin

开发语言: golang

解决方法探寻

什么传输协议会带上数据类型？

* json类型丢失

默认情况下gin的BindJSON，可将传入的参数绑定到具体的结构体，产生类型转换。然后，我的结果需要是动态的，不知道参数的具体内容。

* 自定义参数格式，将类型带上。例如 marchinery

Arg struct{
    Type string
    Value interface{}
}

缺点：太麻烦

* 常用协议中选择

xml 可以用，不理想

yaml 不能解决问题

protobuf 不能解决问题

messagepack 有详细的数据类型，完美

msgpack替代json

gin示例

func SendXX(c *gin.Context){
    rawData, _ := c.GetRawData()
    var param interface{}
    msgpack.Unmarshal(rawData, ¶m)

result := struct{
Name string
}{
Name: "xxx",
}
resultData, _ := msgpack.Marshal(result)
c.Data(200, "application/x-msgpack", resultData)
}

备注

* gin自带的msgpack版本是1.1.7不好用，不会自动进行类型转换。最好改用 github.com/vmihailenco/msgpack/v5

* 替换gin中的部分接口就可以，不用全部改为msgpack

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妙音

msgpack代替json防止丢失类型

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