【grpc04】proto使用实例
创建proto文件
假设，现在需要传输用户信息，其中有username和age两个字段
// 指定的当前proto语法的版本，有2和3
syntax = "proto3";
//option go_package = "path;name"; ath 表示生成的go文件的存放地址，会自动生成目录的
// name 表示生成的go文件所属的包名
option go_package="../service";
// 指定等会文件生成出来的package
package service;
//message关键字，可以理解为golang中的结构体
//变量后面的"赋值"，注意并不是赋值，而是定义这个变量在这个message中的位置
message User {
string username = 1;
int32 age = 2;
}运行protoc命令编译成go中间文件
# 编译user.proto之后输出到service文件夹
protoc --go_out=./ ./user.proto测试
package main
import (
"fmt"
"google.golang.org/protobuf/proto"
"test_grpc/service"
)
func main() {
user := &service.User{
Username: "hello world",
Age: 18,
}
//序列化
marshal, err := proto.Marshal(user)
if err != nil {
panic(err)
}
//反序列化
newUser := &service.User{}
err = proto.Unmarshal(marshal, newUser)
if err != nil {
panic(err)
}
fmt.Println(newUser.String())
}
生成的go中间文件
// 指定的当前proto语法的版本，有2和3
// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// protoc-gen-go v1.26.0
// protoc v3.21.12
// source: user.proto
// 指定等会文件生成出来的package
package service
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 User struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Username string `protobuf:"bytes,1,opt,name=username,proto3" json:"username,omitempty"`
Age int32 `protobuf:"varint,2,opt,name=age,proto3" json:"age,omitempty"`
}
func (x *User) Reset() {
*x = User{}
if protoimpl.UnsafeEnabled {
mi := &file_user_proto_msgTypes[0]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *User) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*User) ProtoMessage() {}
func (x *User) ProtoReflect() protoreflect.Message {
mi := &file_user_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 User.ProtoReflect.Descriptor instead.
func (*User) Descriptor() ([]byte, []int) {
return file_user_proto_rawDescGZIP(), []int{0}
}
func (x *User) GetUsername() string {
if x != nil {
return x.Username
}
return ""
}
func (x *User) GetAge() int32 {
if x != nil {
return x.Age
}
return 0
}
var File_user_proto protoreflect.FileDescriptor
var file_user_proto_rawDesc = []byte{
0x0a, 0x0a, 0x75, 0x73, 0x65, 0x72, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x07, 0x73, 0x65,
0x72, 0x76, 0x69, 0x63, 0x65, 0x22, 0x34, 0x0a, 0x04, 0x55, 0x73, 0x65, 0x72, 0x12, 0x1a, 0x0a,
0x08, 0x75, 0x73, 0x65, 0x72, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52,
0x08, 0x75, 0x73, 0x65, 0x72, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x10, 0x0a, 0x03, 0x61, 0x67, 0x65,
0x18, 0x02, 0x20, 0x01, 0x28, 0x05, 0x52, 0x03, 0x61, 0x67, 0x65, 0x42, 0x0c, 0x5a, 0x0a, 0x2e,
0x2e, 0x2f, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
0x33,
}
var (
file_user_proto_rawDescOnce sync.Once
file_user_proto_rawDescData = file_user_proto_rawDesc
)
func file_user_proto_rawDescGZIP() []byte {
file_user_proto_rawDescOnce.Do(func() {
file_user_proto_rawDescData = protoimpl.X.CompressGZIP(file_user_proto_rawDescData)
})
return file_user_proto_rawDescData
}
var file_user_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
var file_user_proto_goTypes = []interface{}{
(*User)(nil), // 0: service.User
}
var file_user_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_user_proto_init() }
func file_user_proto_init() {
if File_user_proto != nil {
return
}
if !protoimpl.UnsafeEnabled {
file_user_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*User); 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_user_proto_rawDesc,
NumEnums: 0,
NumMessages: 1,
NumExtensions: 0,
NumServices: 0,
},
GoTypes: file_user_proto_goTypes,
DependencyIndexes: file_user_proto_depIdxs,
MessageInfos: file_user_proto_msgTypes,
}.Build()
File_user_proto = out.File
file_user_proto_rawDesc = nil
file_user_proto_goTypes = nil
file_user_proto_depIdxs = nil
}