在使用 protoc 工具生成 go 代码的时候报出的如下错误：
在syntax = “proto3”; //版本号版本中字段默认为syntax = “proto3”; //版本号
protoc ./test.proto --go_out=./
WARNING: Missing 'go_package' option in "message.proto",
please specify it with the full Go package path as
a future release of protoc-gen-go will require this be specified.
是因为在 proto3 的语法中缺少了 option go_package。
解决：
在syntax下面添加option信息
option go_package = "student;student";
student 表示生成的go文件的存放地址，会自动生成目录的。
stu表示生成的go文件所属的包名
比如：
option go_package = "student;stu";
test.proto
syntax = "proto3"; //版本号
option go_package = "student;stu";
message Student{
//消息，对应于Go的结构体
string name=1; //1:标号，唯一 即可（相当于数据库中的Id，不一定要从1 ，2的顺序依次排列。）
int32 age=2; //必须指定整型的范围，如int32，int64
string address=3;
ClassName cn=4;
}
message Students{
repeated Student person=1; // repeated 修饰，相当于Go中切片
string school=2;
}
enum ClassName{
//枚举
class1=0; //标号 必须从 0开始
class2=1;
class3=2;
}
proto_test为我工程的目录
最后生成的结构如上
test.pb.go
// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// protoc-gen-go v1.25.0-devel
// protoc (unknown)
// source: test.proto
package stu
import (
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)
)
type ClassName int32
const (
ClassName_class1 ClassName = 0 //标号 必须从 0开始
ClassName_class2 ClassName = 1
ClassName_class3 ClassName = 2
)
// Enum value maps for ClassName.
var (
ClassName_name = map[int32]string{
0: "class1",
1: "class2",
2: "class3",
}
ClassName_value = map[string]int32{
"class1": 0,
"class2": 1,
"class3": 2,
}
)
func (x ClassName) Enum() *ClassName {
p := new(ClassName)
*p = x
return p
}
func (x ClassName) String() string {
return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
}
func (ClassName) Descriptor() protoreflect.EnumDescriptor {
return file_test_proto_enumTypes[0].Descriptor()
}
func (ClassName) Type() protoreflect.EnumType {
return &file_test_proto_enumTypes[0]
}
func (x ClassName) Number() protoreflect.EnumNumber {
return protoreflect.EnumNumber(x)
}
// Deprecated: Use ClassName.Descriptor instead.
func (ClassName) EnumDescriptor() ([]byte, []int) {
return file_test_proto_rawDescGZIP(), []int{
0}
}
type Student struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"` //1:标号，唯一 即可（相当于数据库中的Id，不一定要从1 ，2的顺序依次排列。）
Age int32 `protobuf:"varint,2,opt,name=age,proto3" json:"age,omitempty"` //必须指定整型的范围，如int32，int64
Address string `protobuf:"bytes,3,opt,name=address,proto3" json:"address,omitempty"`
Cn ClassName `protobuf:"varint,4,opt,name=cn,proto3,enum=ClassName" json:"cn,omitempty"`
}
func (x *Student) Reset() {
*x = Student{
}
if protoimpl.UnsafeEnabled {
mi := &file_test_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_test_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_test_proto_rawDescGZIP(), []int{
0}
}
func (x *Student) GetName() string {
if x != nil {
return x.Name
}
return ""
}
func (x *Student) GetAge() int32 {
if x != nil {
return x.Age
}
return 0
}
func (x *Student) GetAddress() string {
if x != nil {
return x.Address
}
return ""
}
func (x *Student) GetCn() ClassName {
if x != nil {
return x.Cn
}
return ClassName_class1
}
type Students struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Person []*Student `protobuf:"bytes,1,rep,name=person,proto3" json:"person,omitempty"` // repeated 修饰，相当于Go中切片
School string `protobuf:"bytes,2,opt,name=school,proto3" json:"school,omitempty"`
}
func (x *Students) Reset() {
*x = Students{
}
if protoimpl.UnsafeEnabled {
mi := &file_test_proto_msgTypes[1]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *Students) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*Students) ProtoMessage() {
}
func (x *Students) ProtoReflect() protoreflect.Message {
mi := &file_test_proto_msgTypes[1]
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 Students.ProtoReflect.Descriptor instead.
func (*Students) Descriptor() ([]byte, []int) {
return file_test_proto_rawDescGZIP(), []int{
1}
}
func (x *Students) GetPerson() []*Student {
if x != nil {
return x.Person
}
return nil
}
func (x *Students) GetSchool() string {
if x != nil {
return x.School
}
return ""
}
var File_test_proto protoreflect.FileDescriptor
var file_test_proto_rawDesc = []byte{
0x0a, 0x0a, 0x74, 0x65, 0x73, 0x74, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0x65, 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, 0x10, 0x0a, 0x03, 0x61,
0x67, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x05, 0x52, 0x03, 0x61, 0x67, 0x65, 0x12, 0x18, 0x0a,
0x07, 0x61, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07,
0x61, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x12, 0x1a, 0x0a, 0x02, 0x63, 0x6e, 0x18, 0x04, 0x20,
0x01, 0x28, 0x0e, 0x32, 0x0a, 0x2e, 0x43, 0x6c, 0x61, 0x73, 0x73, 0x4e, 0x61, 0x6d, 0x65, 0x52,
0x02, 0x63, 0x6e, 0x22, 0x44, 0x0a, 0x08, 0x53, 0x74, 0x75, 0x64, 0x65, 0x6e, 0x74, 0x73, 0x12,
0x20, 0x0a, 0x06, 0x70, 0x65, 0x72, 0x73, 0x6f, 0x6e, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b, 0x32,
0x08, 0x2e, 0x53, 0x74, 0x75, 0x64, 0x65, 0x6e, 0x74, 0x52, 0x06, 0x70, 0x65, 0x72, 0x73, 0x6f,
0x6e, 0x12, 0x16, 0x0a, 0x06, 0x73, 0x63, 0x68, 0x6f, 0x6f, 0x6c, 0x18, 0x02, 0x20, 0x01, 0x28,
0x09, 0x52, 0x06, 0x73, 0x63, 0x68, 0x6f, 0x6f, 0x6c, 0x2a, 0x2f, 0x0a, 0x09, 0x43, 0x6c, 0x61,
0x73, 0x73, 0x4e, 0x61, 0x6d, 0x65, 0x12, 0x0a, 0x0a, 0x06, 0x63, 0x6c, 0x61, 0x73, 0x73, 0x31,
0x10, 0x00, 0x12, 0x0a, 0x0a, 0x06, 0x63, 0x6c, 0x61, 0x73, 0x73, 0x32, 0x10, 0x01, 0x12, 0x0a,
0x0a, 0x06, 0x63, 0x6c, 0x61, 0x73, 0x73, 0x33, 0x10, 0x02, 0x42, 0x0d, 0x5a, 0x0b, 0x73, 0x74,
0x75, 0x64, 0x65, 0x6e, 0x74, 0x3b, 0x73, 0x74, 0x75, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
0x33,
}
var (
file_test_proto_rawDescOnce sync.Once
file_test_proto_rawDescData = file_test_proto_rawDesc
)
func file_test_proto_rawDescGZIP() []byte {
file_test_proto_rawDescOnce.Do(func() {
file_test_proto_rawDescData = protoimpl.X.CompressGZIP(file_test_proto_rawDescData)
})
return file_test_proto_rawDescData
}
var file_test_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
var file_test_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
var file_test_proto_goTypes = []interface{
}{
(ClassName)(0), // 0: ClassName
(*Student)(nil), // 1: Student
(*Students)(nil), // 2: Students
}
var file_test_proto_depIdxs = []int32{
0, // 0: Student.cn:type_name -> ClassName
1, // 1: Students.person:type_name -> Student
2, // [2:2] is the sub-list for method output_type
2, // [2:2] is the sub-list for method input_type
2, // [2:2] is the sub-list for extension type_name
2, // [2:2] is the sub-list for extension extendee
0, // [0:2] is the sub-list for field type_name
}
func init() {
file_test_proto_init() }
func file_test_proto_init() {
if File_test_proto != nil {
return
}
if !protoimpl.UnsafeEnabled {
file_test_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
}
}
file_test_proto_msgTypes[1].Exporter = func(v interface{
}, i int) interface{
} {
switch v := v.(*Students); 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_test_proto_rawDesc,
NumEnums: 1,
NumMessages: 2,
NumExtensions: 0,
NumServices: 0,
},
GoTypes: file_test_proto_goTypes,
DependencyIndexes: file_test_proto_depIdxs,
EnumInfos: file_test_proto_enumTypes,
MessageInfos: file_test_proto_msgTypes,
}.Build()
File_test_proto = out.File
file_test_proto_rawDesc = nil
file_test_proto_goTypes = nil
file_test_proto_depIdxs = nil
}
2.遇到的问题
ubuntu@VM-0-17-ubuntu:~/go/testpb$ go build
testpb.go:7:2: unknown import path "/home/ubuntu/go/testpb/testpb.go": internal error: module loader did not resolve import
testpb.go:6:2: no required module provides package github.com/golang/protobuf/proto; to add it:
go get github.com/golang/protobuf/proto
ubuntu@VM-0-17-ubuntu:~/go/testpb$ go get github.com/golang/protobuf/proto
go get: module github.com/golang/protobuf/proto: Get "https://proxy.golang.org/github.com/golang/protobuf/proto/@v/list": dial tcp 172.217.160.81:443: i/o timeout
ubuntu@VM-0-17-ubuntu:~/go/testpb$
ubuntu@VM-0-17-ubuntu:~/go/testpb$ go env -w GOPROXY=https://goproxy.cn
ubuntu@VM-0-17-ubuntu:~/go/testpb$ go get github.com/golang/protobuf/proto
go: downloading github.com/golang/protobuf v1.5.2
go: downloading google.golang.org/protobuf v1.26.0
go get: added github.com/golang/protobuf v1.5.2