golang中使用grpc服务
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:
僵尸将臣