如何使用 “自定义字段 tag”

[achilsh]

Is your feature request related to a problem?

1. 我设置了 proto 如下：

syntax = "proto3";
package helloworld;

import "trpc/proto/trpc_options.proto";
import "trpc/swagger/swagger.proto";
import "validate/validate.proto";
option go_package = "trpc-http-demo/helloworld";

// HelloRequest is hello request.
message HelloRequest {
string msg = 1 [ (trpc.go_tag)='json:"xxx"', (validate.rules).string.email=true];
}

// HelloResponse is hello response.
message HelloResponse {
string msg = 1;
}

// HelloWorldService handles hello request and echo message.
service HelloWorldService {
// Hello says hello.
//@alias="/api/helloworld"
rpc Hello(HelloRequest) returns(HelloResponse);
}

2. 运行命令行阐述 项目：
   trpc create --protocol http -p ./hello-world.proto -f -o . --alias --gotag --validate

3. 修改配置文件,http端口号为9100

4. 使用http client 调用：
   5
   

5. 服务端错误：
   2024-09-10 00:09:06.615 DEBUG server/service.go:235 service: helloworld.HelloWorldService handle err (if caused by health checking, this error can be ignored): type:framework, code:1, msg:service codec Unmarshal: proto: (line 2:5): unknown field "xxx"

What is the solution you'd like?

What alternatives have you considered?

Could you provide additional context?

[WineChord]

The default serialization type for application/json is codec.SerializationTypeJSON. Its implementation is jsonpb. When the request struct to be unmarshaled on comes from protobuf pb stub code, it will use jsonpb serializer, which ignores the json:"xxx" tag.

Possible fix: re-register codec.SerializationTypeJSON with std/json or jsoniter (used by the framework), such as:

func main() {
    codec.RegisterSerializer(SerializationTypeJSON, &codec.JSONSerialization{})
    // trpc.NewServer() ...
}