Go语言使用protojson库实现Protocol Buffers与JSON转换

func Format(m proto.Message) string
func Marshal(m proto.Message) ([]byte, error)
func Unmarshal(b []byte, m proto.Message) error
type MarshalOptions
func (o MarshalOptions) Format(m proto.Message) string
func (o MarshalOptions) Marshal(m proto.Message) ([]byte, error)
func (o MarshalOptions) MarshalAppend(b []byte, m proto.Message) ([]byte, error)
type UnmarshalOptions
func (o UnmarshalOptions) Unmarshal(b []byte, m proto.Message) error

# go env -w GOPROXY=https://goproxy.cn
# go env -w GOBIN=%USERPROFILE%\go\bin

# protoc --version
libprotoc 24.3

# go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
# protoc-gen-go --version
protoc-gen-go v1.31.0

syntax = "proto3";
package example.pb;
option go_package = "./;pb";
message User {
  string id = 1;
  string name = 3;
  int32  age = 4;
  string real_name = 5;
  string date = 8;
}

#protoc --go_out=. example.proto 

package main
import (
    "fmt"
    "github.com/google/uuid"
    "github.com/luckytking/practices/libs/protojson/pb"
    "google.golang.org/protobuf/encoding/protojson"
)
func userInfo() *pb.User {
    return &pb.User{
       Id:       uuid.NewString(),
       Name:     uuid.NewString(),
       Age:      33,
       RealName: uuid.NewString(),
       Date:     "",
       //Date:     time.Now().Format(time.DateTime),
    }
}
func main() {
    info := userInfo()
    fmt.Println("data.Src:", info)
    format := protojson.Format(info)
    fmt.Println("data.Format:", format)
    marshal, err := protojson.Marshal(info)
    if err != nil {
       panic(err)
    }
    fmt.Println("data.Marshal:", string(marshal))
    user1 := &pb.User{}
    err = protojson.Unmarshal(marshal, user1)
    fmt.Println("data.Unmarshal:", user1)
    //marshalOpt :=
    marshal2, err := protojson.MarshalOptions{
       EmitUnpopulated: true,
    }.Marshal(info)
    if err != nil {
       panic(err)
    }
    fmt.Println("data.Marshal2:", string(marshal2))
    user2 := &pb.User{}
    err = protojson.Unmarshal(marshal2, user2)
    fmt.Println("data.Unmarshal2:", user2)
} 

data.Src: id:"df8bbcca-d8b9-4e41-91ff-6ccf01567d27"  name:"67115015-48bb-4284-b601-e9348a53d40f"  age:33  real_name:"bed916f1-0fb3-413c-9de3-222cbc90c814"
data.Format: {
  "id":  "df8bbcca-d8b9-4e41-91ff-6ccf01567d27",
  "name":  "67115015-48bb-4284-b601-e9348a53d40f",
  "age":  33,
  "realName":  "bed916f1-0fb3-413c-9de3-222cbc90c814"
}
data.Marshal: {"id":"df8bbcca-d8b9-4e41-91ff-6ccf01567d27", "name":"67115015-48bb-4284-b601-e9348a53d40f", "age":33, "realName":"bed916f1-0fb3-413c-9de3-222cbc90c814"}
data.Unmarshal: id:"df8bbcca-d8b9-4e41-91ff-6ccf01567d27"  name:"67115015-48bb-4284-b601-e9348a53d40f"  age:33  real_name:"bed916f1-0fb3-413c-9de3-222cbc90c814"
data.Marshal2: {"id":"df8bbcca-d8b9-4e41-91ff-6ccf01567d27", "name":"67115015-48bb-4284-b601-e9348a53d40f", "age":33, "realName":"bed916f1-0fb3-413c-9de3-222cbc90c814", "date":""}
data.Unmarshal2: id:"df8bbcca-d8b9-4e41-91ff-6ccf01567d27"  name:"67115015-48bb-4284-b601-e9348a53d40f"  age:33  real_name:"bed916f1-0fb3-413c-9de3-222cbc90c814"

type MarshalOptions struct {
	pragma.NoUnkeyedLiterals
        // Multiline 指定封送拆收器是否应以缩进形式格式化输出，并将每个文本元素放在新行上。// 如果 Indent 是空字符串，则选择任意缩进。
	Multiline bool
        // Indent 指定在多行格式化输出中使用的缩进字符集，
	以便每个条目前面都有缩进，并且
	// 以换行符结尾。如果非空，则 Multiline 被视为 true。
	// 缩进只能由空格或制表符组成。
	Indent string
        // AllowPartial 允许对缺少必填字段的消息进行封送
	// 而不返回错误。如果AllowPartial 为 false（默认值），
	// 如果缺少任何必填字段，Marshal 将返回错误。
	AllowPartial bool
	// UseProtoNames 在 JSON字段名称中使用 proto 字段名称而不是小驼峰命名。
	UseProtoNames bool
        // UseEnumNumbers 将枚举值作为数字发出。
	UseEnumNumbers bool
        // EmitUnpopulated 指定是否发出未填充的字段。//它不会
	发出未填充的 oneof 字段或未填充的扩展字段。
	// 未填充字段发出的 JSON 值如下：
	//  ╔═══════╤════════════════════════════╗
	//  ║ JSON  │ Protobuf field             ║
	//  ╠═══════╪════════════════════════════╣
	//  ║ false │ proto3 boolean fields      ║
	//  ║ 0     │ proto3 numeric fields      ║
	//  ║ ""    │ proto3 string/bytes fields ║
	//  ║ null  │ proto2 scalar fields       ║
	//  ║ null  │ message fields             ║
	//  ║ []    │ list fields                ║
	//  ║ {}    │ map fields                 ║
	//  ╚═══════╧════════════════════════════╝
	EmitUnpopulated bool
	// 解析器用于在扩展 google.protobuf.Any
	// 消息时查找类型。如果为零，则默认使用 protoregistry.GlobalTypes。
	Resolver interface {
		protoregistry.ExtensionTypeResolver
		protoregistry.MessageTypeResolver
	}
}

package main
import (
    "encoding/json"
    "google.golang.org/protobuf/encoding/protojson"
    "testing"
)
func BenchmarkProtoJson(b *testing.B) {
    gen := userInfo()
    for i := 0; i < b.N; i++ {
       protojson.Marshal(gen)
    }
}
func BenchmarkStdJson(b *testing.B) {
    gen := userInfo()
    for i := 0; i < b.N; i++ {
       json.Marshal(gen)
    }
} 

BenchmarkProtoJson
BenchmarkProtoJson-4      230895              4556 ns/op
BenchmarkStdJson
BenchmarkStdJson-4        715443              1732 ns/op