1、安装protobuf
grpc使用protobuf作为IDL(interface descriton language)，且要求protobuf 3.0以上，这里我们直接选用当前最新版本 3.8，git下载地址。
选择操作系统对应的版本下载，这里我们直接使用已经编译好的protoc可执行文件（或者下载安装包编译安装）。
wget https://github.com/protocolbuffers/protobuf/releases/download/v3.8.0-rc1/protoc-3.8.0-rc-1-linux-x86_64.zip tar -zxvf protoc-3.8.0-rc-1-linux-x86_64.zip mv protoc-3.8.0-rc-1-linux-x86_64 /usr/local/protoc ln -s /usr/local/protoc/bin/protoc /usr/local/bin/protoc #查看 protoc protoc --version
2、安装 protoc-gen-go
go get -u github.com/golang/protobuf/protoc-gen-go
3、安装 grpc-go 库
git clone https://github.com/grpc/grpc-go.git $GOPATH/src/google.golang.org/grpc git clone https://github.com/golang/net.git $GOPATH/src/golang.org/x/net git clone https://github.com/golang/text.git $GOPATH/src/golang.org/x/text git clone https://github.com/google/go-genproto.git $GOPATH/src/google.golang.org/genproto cd $GOPATH/src/ go install google.golang.org/grpc
4、编辑proto文件
syntax = "proto3";
// user 包
package user;
// 指定 go 的包路径及包名
// option go_package="app/services;services";
// 指定 php 的命名空间
// option php_namespace="App\\Services";
// User 服务及服务接口的定义
service User {
rpc UserIndex(UserIndexRequest) returns (UserIndexResponse) {}
rpc UserView(UserViewRequest) returns (UserViewResponse) {}
rpc UserPost(UserPostRequest) returns (UserPostResponse) {}
rpc UserDelete(UserDeleteRequest) returns (UserDeleteResponse) {}
}
// 枚举类型
emun EnumUserSex {
SEX_INIT = 0; // 枚举类型必须以 0 起始
SEX_MALE = 1;
SEX_FEMALE = 2;
}
// 用户实体模型
message UserEntity {
string name = 1;
int32 age = 2;
}
// User 服务的各个接口的请求/响应结构
message UserIndexRequest {
int32 page = 1;
int32 page_size = 2;
}
message UserIndexResponse {
int32 err = 1;
string msg = 2;
// 返回一个 UserEntity 对象的列表数据
repeated UserEntity data = 3;
}
message UserViewRequest {
int32 uid = 1;
}
message UserViewResponse {
int32 err = 1;
string msg = 2;
// 返回一个 UserEntity 对象
UserEntity data = 3;
}
message UserPostRequest {
string name = 1;
string password = 2;
int32 age = 3;
}
message UserPostResponse {
int32 err = 1;
string msg = 2;
}
message UserDeleteRequest {
int32 uid = 1;
}
message UserDeleteResponse {
int32 err = 1;
string msg = 2;
}
5、生成接口库
# 加载 protoc-gen-go 插件 生成 grpc 的 go 服务端/客户端 # 注意要安装好 protoc-gen-go 插件 protoc -I. --go_out=plugins=grpc:./user user.proto
6、server端
package main
import (
"context"
"log"
"net"
"rpc/grpc/user"
"google.golang.org/grpc"
"google.golang.org/grpc/reflection"
)
//UserServer 实现User服务的业务对象
type UserServer struct {
}
//UserIndex 实现了User 服务接口的所有方法
func (u *UserServer) UserIndex(ctx context.Context, in *user.UserIndexRequest) (*user.UserIndexResponse, error) {
log.Printf("receive user index request:page %d page_size %d", in.Page, in.PageSize)
return &user.UserIndexResponse{
Err: 0,
Msg: "success",
Data: []*user.UserEntity{
{Name: "aaaa", Age: 28},
{Name: "bbbb", Age: 1},
},
}, nil
}
//UserView 获取详情
func (u *UserServer) UserView(ctx context.Context, in *user.UserViewRequest) (*user.UserViewResponse, error) {
log.Printf("receive user uid request:uid %d", in.Uid)
return &user.UserViewResponse{
Err: 0,
Msg: "success",
Data: &user.UserEntity{
Name: "aaaa", Age: 28,
},
}, nil
}
//UserPost 提交数据
func (u *UserServer) UserPost(ctx context.Context, in *user.UserPostRequest) (*user.UserPostResponse, error) {
log.Printf("receive user uid request:name %s password:%s,age:%d", in.Name, in.Password, in.Age)
return &user.UserPostResponse{
Err: 0,
Msg: "success",
}, nil
}
//UserDelete 删除数据
func (u *UserServer) UserDelete(ctx context.Context, in *user.UserDeleteRequest) (*user.UserDeleteResponse, error) {
log.Printf("receive user uid request:uid %d", in.Uid)
return &user.UserDeleteResponse{
Err: 0,
Msg: "success",
}, nil
}
func main() {
lis, err := net.Listen("tcp", ":1234")
if err != nil {
log.Fatal("failed to listen", err)
}
//创建rpc服务
grpcServer := grpc.NewServer()
//为User服务注册业务实现 将User服务绑定到RPC服务器上
user.RegisterUserServer(grpcServer, &UserServer{})
//注册反射服务， 这个服务是CLI使用的， 跟服务本身没有关系
reflection.Register(grpcServer)
if err := grpcServer.Serve(lis); err != nil {
log.Fatal("faild to server,", err)
}
}
7、客户端
package main
import (
"context"
"fmt"
"log"
"rpc/grpc/user"
"time"
"google.golang.org/grpc"
)
func main() {
//建立链接
conn, err := grpc.Dial("127.0.0.1:1234", grpc.WithInsecure())
if err != nil {
log.Fatal("did not connect", err)
}
defer conn.Close()
userClient := user.NewUserClient(conn)
//设定请求超时时间 3s
ctx, cancel := context.WithTimeout(context.Background(), time.Second*3)
defer cancel()
//UserIndex 请求
userIndexResponse, err := userClient.UserIndex(ctx, &user.UserIndexRequest{
Page: 1,
PageSize: 12,
})
if err != nil {
log.Printf("user index could not greet: %v", err)
}
if 0 == userIndexResponse.Err {
log.Printf("user index success: %s", userIndexResponse.Msg)
// 包含 UserEntity 的数组列表
userEntityList := userIndexResponse.Data
for _, row := range userEntityList {
fmt.Println(row.Name, row.Age)
}
} else {
log.Printf("user index error: %d", userIndexResponse.Err)
}
// UserView 请求
userViewResponse, err := userClient.UserView(ctx, &user.UserViewRequest{Uid: 1})
if err != nil {
log.Printf("user view could not greet: %v", err)
}
if 0 == userViewResponse.Err {
log.Printf("user view success: %s", userViewResponse.Msg)
userEntity := userViewResponse.Data
fmt.Println(userEntity.Name, userEntity.Age)
} else {
log.Printf("user view error: %d", userViewResponse.Err)
}
// UserPost 请求
userPostReponse, err := userClient.UserPost(ctx, &user.UserPostRequest{Name: "big_cat", Password: "123456", Age: 29})
if err != nil {
log.Printf("user post could not greet: %v", err)
}
if 0 == userPostReponse.Err {
log.Printf("user post success: %s", userPostReponse.Msg)
} else {
log.Printf("user post error: %d", userPostReponse.Err)
}
// UserDelete 请求
userDeleteReponse, err := userClient.UserDelete(ctx, &user.UserDeleteRequest{Uid: 1})
if err != nil {
log.Printf("user delete could not greet: %v", err)
}
if 0 == userDeleteReponse.Err {
log.Printf("user delete success: %s", userDeleteReponse.Msg)
} else {
log.Printf("user delete error: %d", userDeleteReponse.Err)
}
}
7、启动服务/请求服务
go run server.go go run client.go
运行结果：
