使用Go开发gRPC

环境：ubuntu 16.04 64位

安装Go

安装过程省略。

安装完成后设置环境变量

开发工具Gogland

安装过程省略。

安装gRPC

go get google.golang.org/grpc

以上过程需要翻墙

安装成功后，会在GOPATH的第一个目录保存相关文件。

安装protoc和go plug-in

下载protoc

https://github.com/google/protobuf/releases

安装go plug-in

go get -u github.com/golang/protobuf/protoc-gen-go

设置环境变量

运行Gogland创建工程FaceRecgonitionServer

目录结构如下

helloworld.proto

syntax = "proto3";option java_multiple_files = true;option java_package = "io.grpc.examples.helloworld";option java_outer_classname = "HelloWorldProto";package helloworld;// The greeting service definition.service Greeter {  // Sends a greeting  rpc SayHello (HelloRequest) returns (HelloReply) {}  rpc SayHelloAgain (HelloRequest) returns (HelloReply) {}}// The request message containing the user's name.message HelloRequest {  string name = 1;}// The response message containing the greetingsmessage HelloReply {  string message = 1;}

编译helloworld.proto，生成helloworld.pb.go

编辑server.go

package mainimport ("log""net""golang.org/x/net/context""google.golang.org/grpc"pb "pb/helloworld""google.golang.org/grpc/reflection")const (port = ":50051")// main is used to implement helloworld.GreeterServer.type server struct{}// SayHello implements helloworld.GreeterServerfunc (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {return &pb.HelloReply{Message: "Hello " + in.Name}, nil}func (s *server) SayHelloAgain(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {return &pb.HelloReply{Message: "Hello again " + in.Name}, nil}func main() {lis, err := net.Listen("tcp", port)if err != nil {log.Fatalf("failed to listen: %v", err)}s := grpc.NewServer()pb.RegisterGreeterServer(s, &server{})// Register reflection service on gRPC main.reflection.Register(s)if err := s.Serve(lis); err != nil {log.Fatalf("failed to serve: %v", err)}}

编辑client.go

package mainimport ("log""os""golang.org/x/net/context""google.golang.org/grpc"pb "pb/helloworld")const (address     = "localhost:50051"defaultName = "chf")func main() {// Set up a connection to the server.conn, err := grpc.Dial(address, grpc.WithInsecure())if err != nil {log.Fatalf("did not connect: %v", err)}defer conn.Close()c := pb.NewGreeterClient(conn)// Contact the server and print out its response.name := defaultNameif len(os.Args) > 1 {name = os.Args[1]}r, err := c.SayHello(context.Background(), &pb.HelloRequest{Name: name})if err != nil {log.Fatalf("could not greet: %v", err)}log.Printf("Greeting: %s", r.Message)r, err = c.SayHelloAgain(context.Background(), &pb.HelloRequest{Name: name})if err != nil {log.Fatalf("could not greet: %v", err)}log.Printf("Greeting: %s", r.Message)}

设置GOPATH

运行server

运行client

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