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

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 greetings
message HelloReply {
  string message = 1;
}

编译helloworld.proto，生成helloworld.pb.go

编辑server.go

package main

import (
	"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.GreeterServer
func (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 main

import (
	"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 := defaultName
	if 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

--结束--