1 进入https://github.com/google/protobuf/releases获取特定release版本的安装包

2 解压 

 tar xzvf protobuf-all-3.5.1.tar.gz 

3 配置

cd protobuf-3.5.1 && ./configure

4 编译

make

如上图所以编译成功。

5 安装

make install

6 支持go语言

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

8 例子：

syntax = "proto3";
 
option java_package = "io.grpc.examples";
 
package helloworld;
 
// The greeter service definition.
service Greeter {
  // Sends a greeting
  rpc SayHello (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;
}

运行编译命令

protoc --go_out=. *.proto 

得到文件hellopb.go，这是规定message的文件

下面是服务端（go）：

package main

import (
	"net"

	pb "hello" // 引入编译生成的包

	"golang.org/x/net/context"
	"google.golang.org/grpc"
	"google.golang.org/grpc/grpclog"
)

const (
	// Address gRPC服务地址
	Address = "127.0.0.1:8080"
)

// 定义helloService并实现约定的接口
type helloService struct{}

// HelloService ...
var HelloService = helloService{}

func (h helloService) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
	resp := new(pb.HelloReply)
	resp.Message = "Hello " + in.Name + "."

	return resp, nil
}

func main() {
	listen, err := net.Listen("tcp", Address)
	if err != nil {
		grpclog.Fatalf("failed to listen: %v", err)
	}

	// 实例化grpc Server
	s := grpc.NewServer()

	// 注册HelloService
	pb.RegisterGreeterServer(s, HelloService)

	grpclog.Println("Listen on " + Address)

	s.Serve(listen)
}

客户端（go）：

package main

//client.go

import (
	"log"
	"os"

	"golang.org/x/net/context"
	"google.golang.org/grpc"
	pb "hello"
)

const (
	address     = "localhost:8080"
	defaultName = "Kity"
)

func main() {
	conn, err := grpc.Dial(address, grpc.WithInsecure())
	if err != nil {
		log.Fatal("did not connect: %v", err)
	}
	defer conn.Close()
	c := pb.NewGreeterClient(conn)

	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.Fatal("could not greet: %v", err)
	}
	log.Printf("Greeting: %s", r.Message)
}

9 问题

1）包太旧——由于更新了protoc，而go的包没有更新导致

hello/hello.pb.go:115: undefined: grpc.SupportPackageIsVersion4
hello/hello.pb.go:135: c.cc.Invoke undefined (type *grpc.ClientConn has no field or method Invoke)

方案：更新go包，并重新生成message文件hello.pb.go

go get -u github.com/golang/protobuf/{proto,protoc-gen-go}

2) grpc包太旧

hello/hello.pb.go:115: undefined: grpc.SupportPackageIsVersion4
hello/hello.pb.go:135: c.cc.Invoke undefined (type *grpc.ClientConn has no field or method Invoke)

方案：因为墙的原因，从github上的镜像获取包，再移动到包对应的位置

go get -u github.com/grpc/grpc-go
mv /opt/goHome/workspace/src/github.com/grpc/grpc-go /opt/goHome/src/google.golang.org/grpc

同样方式更新三个包

github.com/golang/text
github.com/golang/sys
github.com/golang/net

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