versionpb

基于 protobuf 自定义选项，实现的数据多版本定义方法

例子

协议定义

syntax = "proto3";
package examplepb;
option go_package = "examplepb/";
import "github.com/fananchong/versionpb/version.proto";

message Msg1 {
  option (versionpb.version_msg) = "3.0";
  enum Enum1 {
    option (versionpb.version_enum) = "3.0";
    E1 = 0;
    E2 = 1;
    E3 = 2 [ (versionpb.version_enum_value) = "3.3" ];
  }
  bytes f1 = 1;
  int64 f2 = 2;
  Enum1 f3 = 3;
  bool f4 = 4;
  int64 f5 = 5 [ (versionpb.version_field) = "3.1" ];
  Enum1 f6 = 6 [ (versionpb.version_field) = "3.2" ];
}

使用

package main

import (
	"example1/examplepb"
	"fmt"

	"github.com/fananchong/versionpb"
	"google.golang.org/protobuf/reflect/protoregistry"
)

func main() {
	{
		msg := &examplepb.Msg1{}
		fmt.Printf("%v\n", versionpb.MinimalVersion(msg))
	}

	{
		msg := &examplepb.Msg1{F6: examplepb.Msg1_E2}
		fmt.Printf("%v\n", versionpb.MinimalVersion(msg))
	}

	{
		msg := &examplepb.Msg1{F6: examplepb.Msg1_E3}
		fmt.Printf("%v\n", versionpb.MinimalVersion(msg))
	}

	annotations, err := versionpb.AllVersionByFiles(protoregistry.GlobalFiles, []string{"google.protobuf"})
	if err != nil {
		panic(err)
	}
	for _, v := range annotations {
		fmt.Printf("fullname:%v version:%v\n", v.FullName, v.Version)
	}
}

完整例子参见： https://github.com/fananchong/use_protobuf_define_multi_version_example

API

api	说明
MinimalVersion	获取消息版本
AllVersionByFiles	获取所有协议定义版本

参考

本项目是参考了Etcd 对 WAL 文件 Entry 做多版本识别的方法