Golang Protobuf

编译安装编译器protoc

wget https://github.com/protocolbuffers/protobuf/releases/download/v2.6.1/protobuf-2.6.1.zip
unzip protobuf-2.6.1.zip
cd protobuf-2.6.1

./configure CC=clang CXX=clang++ CXXFLAGS='-std=c++11 -stdlib=libc++ -O3 -g' LDFLAGS='-stdlib=libc++' LIBS="-lc++ -lc++abi"

make -j 4 
sudo make install
protoc --version

安装插件

go get -u github.com/golang/protobuf/protoc-gen-go

定义消息类型

// student.proto
syntax = "proto3";
package main;

// this is a comment
message Student {
  string name = 1;
  bool male = 2;
  repeated int32 scores = 3;
}

在当前目录下执行:

protoc --go_out=. *.proto

ls
# student.pb.go  student.proto

protoc 生成的代码:

// student.pb.go
package proto

import (
    proto "github.com/golang/protobuf/proto"
    protoreflect "google.golang.org/protobuf/reflect/protoreflect"
    protoimpl "google.golang.org/protobuf/runtime/protoimpl"
    reflect "reflect"
    sync "sync"
)

const (
    // Verify that this generated code is sufficiently up-to-date.
    _ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
    // Verify that runtime/protoimpl is sufficiently up-to-date.
    _ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
)

// This is a compile-time assertion that a sufficiently up-to-date version
// of the legacy proto package is being used.
const _ = proto.ProtoPackageIsVersion4

// this is a comment
type Student struct {
    state         protoimpl.MessageState
    sizeCache     protoimpl.SizeCache
    unknownFields protoimpl.UnknownFields

    Name   string  `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
    Male   bool    `protobuf:"varint,2,opt,name=male,proto3" json:"male,omitempty"`
    Scores []int32 `protobuf:"varint,3,rep,packed,name=scores,proto3" json:"scores,omitempty"`
}

func (x *Student) Reset() {
    *x = Student{}
    if protoimpl.UnsafeEnabled {
        mi := &file_student_proto_msgTypes[0]
        ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
        ms.StoreMessageInfo(mi)
    }
}

func (x *Student) String() string {
    return protoimpl.X.MessageStringOf(x)
}

func (*Student) ProtoMessage() {}

func (x *Student) ProtoReflect() protoreflect.Message {
    mi := &file_student_proto_msgTypes[0]
    if protoimpl.UnsafeEnabled && x != nil {
        ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
        if ms.LoadMessageInfo() == nil {
            ms.StoreMessageInfo(mi)
        }
        return ms
    }
    return mi.MessageOf(x)
}

// Deprecated: Use Student.ProtoReflect.Descriptor instead.
func (*Student) Descriptor() ([]byte, []int) {
    return file_student_proto_rawDescGZIP(), []int{0}
}

func (x *Student) GetName() string {
    if x != nil {
        return x.Name
    }
    return ""
}

func (x *Student) GetMale() bool {
    if x != nil {
        return x.Male
    }
    return false
}

func (x *Student) GetScores() []int32 {
    if x != nil {
        return x.Scores
    }
    return nil
}

var File_student_proto protoreflect.FileDescriptor

var file_student_proto_rawDesc = []byte{
    0x0a, 0x0d, 0x73, 0x74, 0x75, 0x64, 0x65, 0x6e, 0x74, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12,
    0x04, 0x6d, 0x61, 0x69, 0x6e, 0x22, 0x49, 0x0a, 0x07, 0x53, 0x74, 0x75, 0x64, 0x65, 0x6e, 0x74,
    0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04,
    0x6e, 0x61, 0x6d, 0x65, 0x12, 0x12, 0x0a, 0x04, 0x6d, 0x61, 0x6c, 0x65, 0x18, 0x02, 0x20, 0x01,
    0x28, 0x08, 0x52, 0x04, 0x6d, 0x61, 0x6c, 0x65, 0x12, 0x16, 0x0a, 0x06, 0x73, 0x63, 0x6f, 0x72,
    0x65, 0x73, 0x18, 0x03, 0x20, 0x03, 0x28, 0x05, 0x52, 0x06, 0x73, 0x63, 0x6f, 0x72, 0x65, 0x73,
    0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
}

var (
    file_student_proto_rawDescOnce sync.Once
    file_student_proto_rawDescData = file_student_proto_rawDesc
)

func file_student_proto_rawDescGZIP() []byte {
    file_student_proto_rawDescOnce.Do(func() {
        file_student_proto_rawDescData = protoimpl.X.CompressGZIP(file_student_proto_rawDescData)
    })
    return file_student_proto_rawDescData
}

var file_student_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
var file_student_proto_goTypes = []interface{}{
    (*Student)(nil), // 0: main.Student
}
var file_student_proto_depIdxs = []int32{
    0, // [0:0] is the sub-list for method output_type
    0, // [0:0] is the sub-list for method input_type
    0, // [0:0] is the sub-list for extension type_name
    0, // [0:0] is the sub-list for extension extendee
    0, // [0:0] is the sub-list for field type_name
}

func init() { file_student_proto_init() }
func file_student_proto_init() {
    if File_student_proto != nil {
        return
    }
    if !protoimpl.UnsafeEnabled {
        file_student_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
            switch v := v.(*Student); i {
            case 0:
                return &v.state
            case 1:
                return &v.sizeCache
            case 2:
                return &v.unknownFields
            default:
                return nil
            }
        }
    }
    type x struct{}
    out := protoimpl.TypeBuilder{
        File: protoimpl.DescBuilder{
            GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
            RawDescriptor: file_student_proto_rawDesc,
            NumEnums:      0,
            NumMessages:   1,
            NumExtensions: 0,
            NumServices:   0,
        },
        GoTypes:           file_student_proto_goTypes,
        DependencyIndexes: file_student_proto_depIdxs,
        MessageInfos:      file_student_proto_msgTypes,
    }.Build()
    File_student_proto = out.File
    file_student_proto_rawDesc = nil
    file_student_proto_goTypes = nil
    file_student_proto_depIdxs = nil
}


参考:

https://gist.github.com/liushooter/44bd8e2f6f277f2631841787aafe3d9d

https://geektutu.com/post/quick-go-protobuf.html

https://colobu.com/2019/10/03/protobuf-ultimate-tutorial-in-go/

https://www.cnblogs.com/sanshengshui/p/9739521.html

http://yura415.github.io/js-protobuf-encode-decode/

https://zhuanlan.zhihu.com/p/147391981

https://zhuanlan.zhihu.com/p/95134068

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