一.protobuf简介
在移动互联网时代,
手机流量、
电量是最为有限的资源,而移动端的即时通讯应用无疑必须得直面这两点。解决流量过大的基本方法就是
使用高度压缩的通信协议,而数据压缩后流量减小带来的自然结果也就是省电:因为大数据量的传输必然需要
更久的网络操作、
数据序列化及
反序列化操作,这些都是电量消耗过快的根源。当前即时通讯应用中最热门的
通信协议无疑就是
Google的Protobuf了,基于它的优秀表现,
微信和手机QQ这样的主流IM应用也早已在使用它
Protobuf是
Protocol Buffers的简称,它是Google公司开发的一种
数据描述语言,是一种
轻便高效的
结构化数据存储格式,可以
用于结构化数据,或者说
序列化,它很适合做
数据存储或
RPC 数据交换格式,可用于
通讯协议、
数据存储等领域的语言无关、平台无关、可扩展的
序列化结构数据格式,是一种
灵活,
高效,
自动化的机制,用于
序列化结构化数据,对比于 XML和JSON,它
更小、更快、
更简单,总之它是
微服务中需要使用的东西.
目前提供了 C++、Java、Python 三种语言的 API(即时通讯网注:Protobuf官方工程主页上显示的已支持的开发语言多达10种,分别有:C++、Java、Python、Objective-C、C#、JavaNano、JavaScript、Ruby、Go、PHP,基本上主流的语言都已支持).
Protobuf刚开源时的定位类似于XML、JSON等数据描述语言,通过
附带工具生成代码并
实现将结构化数据序列化的功能.这里更关注的是Protobuf作为
接口规范的描述语言,可以
作为设计安全的跨语言RPC接口的基础工具
-
需要了解几点
(1).优势
(2).劣势
-
缺乏自描述
二.protobuf的安装
github地址:
https://github.com/protocolbuffers/protobuf
版本下载地址:
https://github.com/protocolbuffers/protobuf/tags
(1).下载
这里下载protobuf v3.15.5 的版本,下载地址:
https://github.com/protocolbuffers/protobuf/releases/tag/v3.15.5,选择
protoc-3.15.5-win64.zip
下载,减压并将解压得到的文件中的bin目录路径添加到系统变量中
1).官网下载
2).解压
3).添加到环境变量
环境变量添加操作见文档:
安装ElasticSearch之前的准备工作jdk的安装
在
系统变量找到Path
,把
bin目录路径添加
,然后完成就可以了
4).重启计算机
(2).查看版本
(3).protobuf的go语言插件protoc–gen-go插件
go install github.com/golang/protobuf/protoc-gen-go@latest
F:wwwgo-datasrcgo_codemicro>go install github.com/golang/protobuf/protoc-gen-go@latest
go: downloading github.com/golang/protobuf v1.5.3
go: downloading google.golang.org/protobuf v1.26.0
F:wwwgo-datasrcgo_codemicro>
(1).方式一:安装protobuf (推荐)
brew install protobuf
(2).方式二:安装protobuf
(1).下载
下载地址:
https://github.com/protocolbu%EF%AC%80ers/protobuf/releases
选择适合macos的protobuf,比如选择protoc-3.12.1-osx–x86_64.zip
(2).解压
(3).重命名
mv protoc-3.12.1-osx-x86_64 protobuf
(4).配置环境变量
vim ~/.bash_profile
export PROTOBUF=/Users/nacos/Library/protobuf
export PATH=$PATH:$PROTOBUF/bin
(5).刷新配置
source ~/.bash_profile
(6).查看版本
protoc --version
(3).protobuf的go语言插件protoc-gen-go插件
go install github.com/golang/protobuf/protoc-gen-go@latest
(4).配置环境变量
vim ~/.bash_profile
export PATH=/Users/nacos/go/bin:$PATH
(5).刷新配置
source ~/.bash_profile
(1).新建 test.proto
syntax = "proto3";
option go_package = "./protoService";
message Userinfo {
string name = 1;
int32 age = 2;
repeated string hobby = 3;
}
(2).把proto 文件编译成go文件
F:wwwgo-datasrcgo_codemicroprotoc>protoc --go_out=./ *.proto
(3).结果
三.protobuf 的用法
参考文档(需科学上网):
https://developers.google.com/protocol-buffers/docs/proto3
(1).案例引入
syntax = "proto3"; //指定版本信息,不指定会报错,默认是proto2
//分号(;)前面的表示当前.proto文件所在的路径,分号后面表示生成go文件的包名
option go_package = "./proto;helloworld";
//message定义一种消息类型,关键字message定义结构,并且结构中可以嵌套定义结构,message定义的内容和生成一个结构体
message Person{
//名字
string name = 1;
//年龄
int32 age = 2 ;
//爱好
repeated string hobby = 3; // repeadted关键字类似与go中的切片,编译之后对应的也是go的切片,golang中会生成string类型的切片
}
(2).总结
-
最后message关键字定义一个Person消息体,类似于go语言中的结构体,是包含一系列类型数据的集合,许多标准的简单数据类型都可以作为字段类型,包括 bool , int32 ,float , double ,和 string 。也可以使用其他message类型作为字段类型
-
在message中有一个字符串类型的value成员,该成员编码时用1代替名字,在json中是通过成员的名字来绑定对应的数据,但是Protobuf编码却是通过成员的唯一编号来绑定对应的数据,因此Protobuf编码后数据的体积会比较小,能够快速传输,缺点是不利于阅读
(3).message的格式说明
//注释格式 注释尽量也写在内容上方
(字段修饰符)数据类型 字段名称 = 唯一的编号标签值;
-
唯一的编号标签:代表每个字段的一个唯一的编号标签,在同一个消息里不可以重复,这些编号标签用与在消息二进制格式中标识字段,并且消息一旦定义就不能更改,需要说明的是标签在1到15范围的采用一个字节进行编码,16 ~ 2047采用双字节编码,所以通常将标签1到15用于频繁发生的消息字段,编号标签大小的范围是1到2的29次,19000-19999是官方预留的值,不能使用
message SearchRequest {
string query = 1;
int32 page_number = 2;
int32 result_per_page = 3;
}
message SearchResponse {
...
}
(4).proto2和proto3差别
区别
在 proto2 中,可以使用
default 选项为某一字段指定默认值,
在 proto3 中,字段的默认值只能根据字段类型由系统决定,也就是说,
默认值全部是约定好的,而不再提供指定默认值的语法
proto3字段规则
在proto2中,规则为:
required:必须有一个
optional:0或者1个
repeated:任意数量(包括0)
(1).message嵌套
syntax = "proto3";//指定版本信息,不指定会报错
option go_package = "./proto;helloworld";
//message为关键字,作用为定义一种消息类型
message Person{
//名字
string name = 1;
//年龄
int32 age = 2 ;
//定义一个message
message PhoneNumber {
string number = 1;
int64 type = 2;
}
PhoneNumber phone = 3;
}
(2).repeated关键字
syntax = "proto3";//指定版本信息,不指定会报错
option go_package = "./proto;helloworld";
//message为关键字,作用为定义一种消息类型
message Person{
//名字
string name = 1;
//年龄
int32 age = 2 ;
//定义一个message
message PhoneNumber {
string number = 1;
int64 type = 2;
}
// repeated: 该字段可以重复任意次数(包括零次)。重复值的顺序将被保留
repeated PhoneNumber phone = 3;
}
(3).默认值
当解析 message 时,如果被编码的 message 里没有包含某些变量,那么根据类型不同,他们会有不同的默认值,具体如下:
-
string:默认是空的字符串
-
repeated字段默认值是空列表
收到数据后反序列化后,对于
标准值类型的数据,比如bool,如果它的值是 false,那么就无法判断这个值是对方设置的,还是对方压根就没给这个变量设置值
(4).enum关键字
在定义消息类型时,可能会希望其中一个字段有一个
预定义的值列表,比如说,电话号码字段有个类型,这个类型可以是:home,work,mobile,可以通过enum在消息定义中添加每个可能值的常量来非常简单的执行此操作,实例如下
syntax = "proto3";//指定版本信息,不指定会报错
package pb;//后期生成go文件的包名
//message为关键字,作用为定义一种消息类型
message Person{
//名字
string name = 1;
//年龄
int32 age = 2 ;
//定义一个message
message PhoneNumber {
string number = 1;
PhoneType type = 2;
}
repeated PhoneNumber phone = 3;
// 枚举:可以在message内定义
enum Corpus {
UNIVERSAL = 0;
WEB = 1;
IMAGES = 2;
LOCAL = 3;
NEWS = 4;
PRODUCTS = 5;
VIDEO = 6;
}
Corpus corpus = 4;
}
//enum为关键字,作用为定义一种枚举类型,可以在message外定义
enum PhoneType {
MOBILE = 0;
HOME = 1;
WORK = 2;
}
如上,enum的
第一个常量映射为0,每个枚举定义
必须包含一个映射到零的常量作为其
第一个元素,这是因为:
必须有一个零值,以便可以使用0作为数字
默认值
零值必须是第一个元素,以便与proto2语义
兼容,其中第一个枚举值始终是默认值
枚举值不能重复,除非使用
option allow_alias = true 选项来开启别名:
enum EnumAllowingAlias {
option allow_alias = true;
UNKNOWN = 0;
STARTED = 1;
RUNNING = 1;.
}
枚举定义在一
个消息内部或消息外部都是可以的,如果枚举是 定义在 message 内部,而其他message又想使用,那么可以通过
MessageType.EnumType 的方式引用
(5).定义RPC服务
如果需要将message与
RPC一起使用,则可以在 .proto 文件中
定义RPC服务接口,protobuf编译器将根据选择的语言生成RPC接口代码,示例如下:
//定义RPC服务
service HelloService {
rpc Hello (Person)returns (Person);
}
定义一个RPC的服务
syntax = "proto3";
option go_package = "./sayService";
service sayService {
rpc SayHello(HelloRequest) returns (HelloRes)
}
message HelloRequest {
string name = 1;
}
message HelloRes {
string message = 1;
}
protoc --go_out=plugins=grpc:. *.proto
(6).案例总结
syntax = "proto3";
//声明是为了防止不同项目之间的命名冲突,编译生成的类将被放置在一个与 package 名相同的命名空间中
package tutorial;
message Student {
// 字段编号:消息定义中的每个字段都有一个唯一的编号,这些字段编号用于以二进制格式标识您的字段,一旦您的消息类型被使用,就不应该被更改
uint64 id = 1;
string name = 2;
// singular修饰符修饰的字段可以是0次或者1次,但是当定制协议,用该修饰符修饰的字段都报错
// singular string email = 3;
string email = 3;
enum PhoneType {
MOBILE = 0; //proto3版本中,首成员必须为0,成员不应有相同的值
HOME = 1;
}
message PhoneNumber {
string number = 1;
PhoneType type = 2;
}
// repeated: 该字段可以重复任意次数(包括零次),重复值的顺序将被保留
repeated PhoneNumber phone = 4;
}
protobuf
编译是通过
编译器protoc进行的,通过这个编译器,可以把.proto文件生成
go,Java,Python,C++, Ruby, JavaNano, Objective-C,或者C# 代码,生成命令如下:
protoc
–proto_path=
IMPORT_PATH
–go_out=
DST_DIR path/to/file.proto
-
–proto_path=IMPORT_PATH,IMPORT_PATH是 .proto 文件所在的路径,如果忽略则默认当前目录,如果有多个目录则可以多次调用–proto_path,它们将会顺序的被访问并执行导入
一般在使用的时候都是使用下面这种简单的命令
protoc --go_out=./ *.proto
然后给这个 .proto 文件中添加一个RPC服务,再次进行编译,发现生成的go文件没有发生变化,这是因为世界上的RPC实现有很多种,protoc编译器并不知道该如何为HelloService服务生成代码,不过在protoc-gen-go内部已经集成了一个叫grpc的插件,可以针对grpc生成代码:
protoc --go_out=plugins=grpc:. *.proto
(1).新建proto/test.proto
syntax = "proto3";
option go_package = "./protoService";
message Userinfo {
string name = 1;
int32 age = 2;
repeated string hobby = 3;
PhoneType phone=4;
}
//enum为关键字,作用为定义一种枚举类型
enum PhoneType {
MOBILE = 0;
HOME = 1;
WORK = 2;
}
(2).命令运行,生成.go文件
protoc --go_out=./ *.proto //一般情况下使用这个命令
protoc --go_out=plugins=grpc:. *.proto //有RPC服务的情况下使用这个命令
在这里使用了google.golang.org/protobuf下相关函数,则需要引入对应的插件进行操作,命令如下:
如果protoService/test.pd.go中的protobuf还是没有被引入,图示:
则找到go mod tidy 下载的google.golang.org,把protobuf复制到src下,如图示:
这样protoServe/test.pb.go中的goole相关插件就引入了,test.pb.go中的protobuf变绿,成功了:
main.go中实现序列化和反序列化
package main
import (
"fmt"
"go_code/micro/protoc/protoService"
"google.golang.org/protobuf/proto"
)
func main() {
//初始化并赋值
u := &protoService.Userinfo{
Name: "zhangsan",
Age: 20,
Hobby: []string{"吃饭", "睡觉", "写代码"},
}
fmt.Println(u.GetHobby())
// proto.Marshald对protoBufer进行序列化
data, err1 := proto.Marshal(u)
if err1 != nil {
fmt.Println(err1)
}
fmt.Println(data)
//proto.Unmarshal可以对protoBufer进行反序列化
info := protoService.Userinfo{}
err2 := proto.Unmarshal(data, &info)
if err2 != nil {
fmt.Println(err2)
}
fmt.Printf("%#v", info)
fmt.Println(info.GetHobby())
}
(1).案例1
userinfo.proto
syntax = "proto3"; //版本
//./userService:在./userService文件夹中生成文件
option go_package = "./userService";
//注意:写完一行以后要注意 ;
message userinfo{
string username =1; //类型 字段 = 数字(位置)
int32 age =2;
PhoneType type=3;
repeated string hobby=4;
}
//enum为关键字,作用为定义一种枚举类型
enum PhoneType {
MOBILE = 0;
HOME = 1;
WORK = 2;
}
//编译的命令:protoc --go_out=./ *.proto
userService/userinfo.pd.go
使用:protoc –go_out=./ *.proto生成的.go文件
// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// protoc-gen-go v1.26.0
// protoc v3.20.0
// source: userinfo.proto
package userService
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)
)
//enum为关键字,作用为定义一种枚举类型
type PhoneType int32
const (
PhoneType_MOBILE PhoneType = 0
PhoneType_HOME PhoneType = 1
PhoneType_WORK PhoneType = 2
)
// Enum value maps for PhoneType.
var (
PhoneType_name = map[int32]string{
0: "MOBILE",
1: "HOME",
2: "WORK",
}
PhoneType_value = map[string]int32{
"MOBILE": 0,
"HOME": 1,
"WORK": 2,
}
)
func (x PhoneType) Enum() *PhoneType {
p := new(PhoneType)
*p = x
return p
}
func (x PhoneType) String() string {
return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
}
func (PhoneType) Descriptor() protoreflect.EnumDescriptor {
return file_userinfo_proto_enumTypes[0].Descriptor()
}
func (PhoneType) Type() protoreflect.EnumType {
return &file_userinfo_proto_enumTypes[0]
}
func (x PhoneType) Number() protoreflect.EnumNumber {
return protoreflect.EnumNumber(x)
}
// Deprecated: Use PhoneType.Descriptor instead.
func (PhoneType) EnumDescriptor() ([]byte, []int) {
return file_userinfo_proto_rawDescGZIP(), []int{0}
}
//注意:写完一行以后要注意 ;
type Userinfo 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"`
Type PhoneType `protobuf:"varint,3,opt,name=type,proto3,enum=PhoneType" json:"type,omitempty"`
Hobby []string `protobuf:"bytes,4,rep,name=hobby,proto3" json:"hobby,omitempty"`
}
func (x *Userinfo) Reset() {
*x = Userinfo{}
if protoimpl.UnsafeEnabled {
mi := &file_userinfo_proto_msgTypes[0]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *Userinfo) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*Userinfo) ProtoMessage() {}
func (x *Userinfo) ProtoReflect() protoreflect.Message {
mi := &file_userinfo_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 Userinfo.ProtoReflect.Descriptor instead.
func (*Userinfo) Descriptor() ([]byte, []int) {
return file_userinfo_proto_rawDescGZIP(), []int{0}
}
func (x *Userinfo) GetUsername() string {
if x != nil {
return x.Username
}
return ""
}
func (x *Userinfo) GetAge() int32 {
if x != nil {
return x.Age
}
return 0
}
func (x *Userinfo) GetType() PhoneType {
if x != nil {
return x.Type
}
return PhoneType_MOBILE
}
func (x *Userinfo) GetHobby() []string {
if x != nil {
return x.Hobby
}
return nil
}
var File_userinfo_proto protoreflect.FileDescriptor
var file_userinfo_proto_rawDesc = []byte{
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}
var (
file_userinfo_proto_rawDescOnce sync.Once
file_userinfo_proto_rawDescData = file_userinfo_proto_rawDesc
)
func file_userinfo_proto_rawDescGZIP() []byte {
file_userinfo_proto_rawDescOnce.Do(func() {
file_userinfo_proto_rawDescData = protoimpl.X.CompressGZIP(file_userinfo_proto_rawDescData)
})
return file_userinfo_proto_rawDescData
}
var file_userinfo_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
var file_userinfo_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
var file_userinfo_proto_goTypes = []interface{}{
(PhoneType)(0), // 0: PhoneType
(*Userinfo)(nil), // 1: userinfo
}
var file_userinfo_proto_depIdxs = []int32{
0, // 0: userinfo.type:type_name -> PhoneType
1, // [1:1] is the sub-list for method output_type
1, // [1:1] is the sub-list for method input_type
1, // [1:1] is the sub-list for extension type_name
1, // [1:1] is the sub-list for extension extendee
0, // [0:1] is the sub-list for field type_name
}
func init() { file_userinfo_proto_init() }
func file_userinfo_proto_init() {
if File_userinfo_proto != nil {
return
}
if !protoimpl.UnsafeEnabled {
file_userinfo_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*Userinfo); 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_userinfo_proto_rawDesc,
NumEnums: 1,
NumMessages: 1,
NumExtensions: 0,
NumServices: 0,
},
GoTypes: file_userinfo_proto_goTypes,
DependencyIndexes: file_userinfo_proto_depIdxs,
EnumInfos: file_userinfo_proto_enumTypes,
MessageInfos: file_userinfo_proto_msgTypes,
}.Build()
File_userinfo_proto = out.File
file_userinfo_proto_rawDesc = nil
file_userinfo_proto_goTypes = nil
file_userinfo_proto_depIdxs = nil
}
main.go
序列化和
反序列化实现
package main
import (
"fmt"
"proto_deom/proto/userService"
"google.golang.org/protobuf/proto"
)
func main() {
u := &userService.Userinfo{
Username: "张三",
Age: 20,
Hobby: []string{"吃饭", "睡觉", "写代码"},
}
// fmt.Println(u)
fmt.Println(u.GetType())
fmt.Println(u.GetUsername())
fmt.Println(u.GetHobby())
//Protobuf的序列化
data, _ := proto.Marshal(u)
fmt.Println(data)
//Protobuf的反序列化
user := userService.Userinfo{}
proto.Unmarshal(data, &user)
fmt.Printf("%#vn", user)
fmt.Println(user.GetHobby())
}
(2).案例2
order.proto
syntax = "proto3";
option go_package = "./orderService";
message Order{
int64 id =1;
double price =2;
string name =3;
string tel=4;
string address=5;
string addTime=6;
//message可以嵌套
// message OrderItem{
// int64 goodsId =1;
// string title=2;
// double price =3;
// int32 num =4;
// }
OrderItem Orderitem =7;
}
message OrderItem{
int64 goodsId =1;
string title=2;
double price =3;
int32 num =4;
}
// protoc --go_out=./ *.proto
orderService/order.pb.go
// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// protoc-gen-go v1.26.0
// protoc v3.20.0
// source: order.proto
package orderService
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 Order struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Id int64 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
Price float64 `protobuf:"fixed64,2,opt,name=price,proto3" json:"price,omitempty"`
Name string `protobuf:"bytes,3,opt,name=name,proto3" json:"name,omitempty"`
Tel string `protobuf:"bytes,4,opt,name=tel,proto3" json:"tel,omitempty"`
Address string `protobuf:"bytes,5,opt,name=address,proto3" json:"address,omitempty"`
AddTime string `protobuf:"bytes,6,opt,name=addTime,proto3" json:"addTime,omitempty"`
//message可以嵌套
// message OrderItem{
// int64 goodsId =1;
// string title=2;
// double price =3;
// int32 num =4;
// }
Orderitem *OrderItem `protobuf:"bytes,7,opt,name=Orderitem,proto3" json:"Orderitem,omitempty"`
}
func (x *Order) Reset() {
*x = Order{}
if protoimpl.UnsafeEnabled {
mi := &file_order_proto_msgTypes[0]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *Order) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*Order) ProtoMessage() {}
func (x *Order) ProtoReflect() protoreflect.Message {
mi := &file_order_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 Order.ProtoReflect.Descriptor instead.
func (*Order) Descriptor() ([]byte, []int) {
return file_order_proto_rawDescGZIP(), []int{0}
}
func (x *Order) GetId() int64 {
if x != nil {
return x.Id
}
return 0
}
func (x *Order) GetPrice() float64 {
if x != nil {
return x.Price
}
return 0
}
func (x *Order) GetName() string {
if x != nil {
return x.Name
}
return ""
}
func (x *Order) GetTel() string {
if x != nil {
return x.Tel
}
return ""
}
func (x *Order) GetAddress() string {
if x != nil {
return x.Address
}
return ""
}
func (x *Order) GetAddTime() string {
if x != nil {
return x.AddTime
}
return ""
}
func (x *Order) GetOrderitem() *OrderItem {
if x != nil {
return x.Orderitem
}
return nil
}
type OrderItem struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
GoodsId int64 `protobuf:"varint,1,opt,name=goodsId,proto3" json:"goodsId,omitempty"`
Title string `protobuf:"bytes,2,opt,name=title,proto3" json:"title,omitempty"`
Price float64 `protobuf:"fixed64,3,opt,name=price,proto3" json:"price,omitempty"`
Num int32 `protobuf:"varint,4,opt,name=num,proto3" json:"num,omitempty"`
}
func (x *OrderItem) Reset() {
*x = OrderItem{}
if protoimpl.UnsafeEnabled {
mi := &file_order_proto_msgTypes[1]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *OrderItem) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*OrderItem) ProtoMessage() {}
func (x *OrderItem) ProtoReflect() protoreflect.Message {
mi := &file_order_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 OrderItem.ProtoReflect.Descriptor instead.
func (*OrderItem) Descriptor() ([]byte, []int) {
return file_order_proto_rawDescGZIP(), []int{1}
}
func (x *OrderItem) GetGoodsId() int64 {
if x != nil {
return x.GoodsId
}
return 0
}
func (x *OrderItem) GetTitle() string {
if x != nil {
return x.Title
}
return ""
}
func (x *OrderItem) GetPrice() float64 {
if x != nil {
return x.Price
}
return 0
}
func (x *OrderItem) GetNum() int32 {
if x != nil {
return x.Num
}
return 0
}
var File_order_proto protoreflect.FileDescriptor
var file_order_proto_rawDesc = []byte{
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0x72, 0x69, 0x63, 0x65, 0x12, 0x10, 0x0a, 0x03, 0x6e, 0x75, 0x6d, 0x18, 0x04, 0x20, 0x01, 0x28,
0x05, 0x52, 0x03, 0x6e, 0x75, 0x6d, 0x42, 0x10, 0x5a, 0x0e, 0x2e, 0x2f, 0x6f, 0x72, 0x64, 0x65,
0x72, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
}
var (
file_order_proto_rawDescOnce sync.Once
file_order_proto_rawDescData = file_order_proto_rawDesc
)
func file_order_proto_rawDescGZIP() []byte {
file_order_proto_rawDescOnce.Do(func() {
file_order_proto_rawDescData = protoimpl.X.CompressGZIP(file_order_proto_rawDescData)
})
return file_order_proto_rawDescData
}
var file_order_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
var file_order_proto_goTypes = []interface{}{
(*Order)(nil), // 0: Order
(*OrderItem)(nil), // 1: OrderItem
}
var file_order_proto_depIdxs = []int32{
1, // 0: Order.Orderitem:type_name -> OrderItem
1, // [1:1] is the sub-list for method output_type
1, // [1:1] is the sub-list for method input_type
1, // [1:1] is the sub-list for extension type_name
1, // [1:1] is the sub-list for extension extendee
0, // [0:1] is the sub-list for field type_name
}
func init() { file_order_proto_init() }
func file_order_proto_init() {
if File_order_proto != nil {
return
}
if !protoimpl.UnsafeEnabled {
file_order_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*Order); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
file_order_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*OrderItem); 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_order_proto_rawDesc,
NumEnums: 0,
NumMessages: 2,
NumExtensions: 0,
NumServices: 0,
},
GoTypes: file_order_proto_goTypes,
DependencyIndexes: file_order_proto_depIdxs,
MessageInfos: file_order_proto_msgTypes,
}.Build()
File_order_proto = out.File
file_order_proto_rawDesc = nil
file_order_proto_goTypes = nil
file_order_proto_depIdxs = nil
}
(3).案例3
goods.proto
RPC服务的定义
syntax = "proto3";
option go_package = "./goodsService";
//RPC接口, 定义RPC服务,生成的是接口
service GoodsService{
rpc AddGoods(AddGoodsReq) returns (AddGoodsRes);
rpc GetGoods(GetGoodsReq) returns (GetGoodsRes);
}
message GoodsMode{
string title =1;
double price =2;
string content =3;
}
//AddGoods相关参数
message AddGoodsReq{
GoodsMode params=1;
}
message AddGoodsRes{
string message =1;
bool success =2;
}
//GetGoods相关参数
message GetGoodsReq{
int32 id =1;
}
message GetGoodsRes{
repeated GoodsMode goodsList=1;
}
/*
protoc --go_out=./ *.proto
有RPC接口使用下面方法生成proto go文件
protoc --go_out=plugins=grpc:. *.proto
*/
goodsService/goods.pb.go
// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// protoc-gen-go v1.26.0
// protoc v3.20.0
// source: goods.proto
package goodsService
import (
context "context"
grpc "google.golang.org/grpc"
codes "google.golang.org/grpc/codes"
status "google.golang.org/grpc/status"
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 AddGoodsReq struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Title string `protobuf:"bytes,1,opt,name=title,proto3" json:"title,omitempty"`
Price float64 `protobuf:"fixed64,2,opt,name=price,proto3" json:"price,omitempty"`
Content string `protobuf:"bytes,3,opt,name=content,proto3" json:"content,omitempty"`
}
func (x *AddGoodsReq) Reset() {
*x = AddGoodsReq{}
if protoimpl.UnsafeEnabled {
mi := &file_goods_proto_msgTypes[0]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *AddGoodsReq) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*AddGoodsReq) ProtoMessage() {}
func (x *AddGoodsReq) ProtoReflect() protoreflect.Message {
mi := &file_goods_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 AddGoodsReq.ProtoReflect.Descriptor instead.
func (*AddGoodsReq) Descriptor() ([]byte, []int) {
return file_goods_proto_rawDescGZIP(), []int{0}
}
func (x *AddGoodsReq) GetTitle() string {
if x != nil {
return x.Title
}
return ""
}
func (x *AddGoodsReq) GetPrice() float64 {
if x != nil {
return x.Price
}
return 0
}
func (x *AddGoodsReq) GetContent() string {
if x != nil {
return x.Content
}
return ""
}
type AddGoodsRes struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Message string `protobuf:"bytes,1,opt,name=message,proto3" json:"message,omitempty"`
Success bool `protobuf:"varint,2,opt,name=success,proto3" json:"success,omitempty"`
}
func (x *AddGoodsRes) Reset() {
*x = AddGoodsRes{}
if protoimpl.UnsafeEnabled {
mi := &file_goods_proto_msgTypes[1]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *AddGoodsRes) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*AddGoodsRes) ProtoMessage() {}
func (x *AddGoodsRes) ProtoReflect() protoreflect.Message {
mi := &file_goods_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 AddGoodsRes.ProtoReflect.Descriptor instead.
func (*AddGoodsRes) Descriptor() ([]byte, []int) {
return file_goods_proto_rawDescGZIP(), []int{1}
}
func (x *AddGoodsRes) GetMessage() string {
if x != nil {
return x.Message
}
return ""
}
func (x *AddGoodsRes) GetSuccess() bool {
if x != nil {
return x.Success
}
return false
}
var File_goods_proto protoreflect.FileDescriptor
var file_goods_proto_rawDesc = []byte{
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0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
}
var (
file_goods_proto_rawDescOnce sync.Once
file_goods_proto_rawDescData = file_goods_proto_rawDesc
)
func file_goods_proto_rawDescGZIP() []byte {
file_goods_proto_rawDescOnce.Do(func() {
file_goods_proto_rawDescData = protoimpl.X.CompressGZIP(file_goods_proto_rawDescData)
})
return file_goods_proto_rawDescData
}
var file_goods_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
var file_goods_proto_goTypes = []interface{}{
(*AddGoodsReq)(nil), // 0: AddGoodsReq
(*AddGoodsRes)(nil), // 1: AddGoodsRes
}
var file_goods_proto_depIdxs = []int32{
0, // 0: GoodsService.AddGoods:input_type -> AddGoodsReq
1, // 1: GoodsService.AddGoods:output_type -> AddGoodsRes
1, // [1:2] is the sub-list for method output_type
0, // [0:1] 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_goods_proto_init() }
func file_goods_proto_init() {
if File_goods_proto != nil {
return
}
if !protoimpl.UnsafeEnabled {
file_goods_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*AddGoodsReq); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
file_goods_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*AddGoodsRes); 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_goods_proto_rawDesc,
NumEnums: 0,
NumMessages: 2,
NumExtensions: 0,
NumServices: 1,
},
GoTypes: file_goods_proto_goTypes,
DependencyIndexes: file_goods_proto_depIdxs,
MessageInfos: file_goods_proto_msgTypes,
}.Build()
File_goods_proto = out.File
file_goods_proto_rawDesc = nil
file_goods_proto_goTypes = nil
file_goods_proto_depIdxs = nil
}
// Reference imports to suppress errors if they are not otherwise used.
var _ context.Context
var _ grpc.ClientConnInterface
// This is a compile-time assertion to ensure that this generated file
// is compatible with the grpc package it is being compiled against.
const _ = grpc.SupportPackageIsVersion6
// GoodsServiceClient is the client API for GoodsService service.
//
// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
type GoodsServiceClient interface {
AddGoods(ctx context.Context, in *AddGoodsReq, opts ...grpc.CallOption) (*AddGoodsRes, error)
}
type goodsServiceClient struct {
cc grpc.ClientConnInterface
}
func NewGoodsServiceClient(cc grpc.ClientConnInterface) GoodsServiceClient {
return &goodsServiceClient{cc}
}
func (c *goodsServiceClient) AddGoods(ctx context.Context, in *AddGoodsReq, opts ...grpc.CallOption) (*AddGoodsRes, error) {
out := new(AddGoodsRes)
err := c.cc.Invoke(ctx, "/GoodsService/AddGoods", in, out, opts...)
if err != nil {
return nil, err
}
return out, nil
}
// GoodsServiceServer is the server API for GoodsService service.
type GoodsServiceServer interface {
AddGoods(context.Context, *AddGoodsReq) (*AddGoodsRes, error)
}
// UnimplementedGoodsServiceServer can be embedded to have forward compatible implementations.
type UnimplementedGoodsServiceServer struct {
}
func (*UnimplementedGoodsServiceServer) AddGoods(context.Context, *AddGoodsReq) (*AddGoodsRes, error) {
return nil, status.Errorf(codes.Unimplemented, "method AddGoods not implemented")
}
func RegisterGoodsServiceServer(s *grpc.Server, srv GoodsServiceServer) {
s.RegisterService(&_GoodsService_serviceDesc, srv)
}
func _GoodsService_AddGoods_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
in := new(AddGoodsReq)
if err := dec(in); err != nil {
return nil, err
}
if interceptor == nil {
return srv.(GoodsServiceServer).AddGoods(ctx, in)
}
info := &grpc.UnaryServerInfo{
Server: srv,
FullMethod: "/GoodsService/AddGoods",
}
handler := func(ctx context.Context, req interface{}) (interface{}, error) {
return srv.(GoodsServiceServer).AddGoods(ctx, req.(*AddGoodsReq))
}
return interceptor(ctx, in, info, handler)
}
var _GoodsService_serviceDesc = grpc.ServiceDesc{
ServiceName: "GoodsService",
HandlerType: (*GoodsServiceServer)(nil),
Methods: []grpc.MethodDesc{
{
MethodName: "AddGoods",
Handler: _GoodsService_AddGoods_Handler,
},
},
Streams: []grpc.StreamDesc{},
Metadata: "goods.proto",
}
原文地址:https://blog.csdn.net/zhoupenghui168/article/details/130923516
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