记录protobuf和grpc的操作过程

1 安装protobuf

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

1.2  解压 

 tar xzvf protobuf-all-3.5.1.tar.gz 

1.3 配置

cd protobuf-3.5.1 && ./configure

1.4 编译

make

如上图所以编译成功。

1.5 安装

make install

2 支持go语言

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

3 安装gRPC

go get -u -v google.golang.org/grpc

4 例子

syntax = "proto3";

option go_package = "github.com/grpc/example/helloworld";

package helloworld;

// The greeting 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 helloworld.proto --go_out=plugins=grpc:output

得到文件hellopb.go，这是规定message的文件

下面是服务端（go）：

package main

import (
	"context"
	"log"
	"net"

	"google.golang.org/grpc"
	pb "./output/github.com/grpc/example/helloworld"
	"google.golang.org/grpc/reflection"
)

const (
	port = ":50051"
)

// server 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 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 server.
	reflection.Register(s)
	if err := s.Serve(lis); err != nil {
		log.Fatalf("failed to serve: %v", err)
	}
}

 

客户端（go）：

package main

import (
	"context"
	"log"
	"os"
	"time"

	"google.golang.org/grpc"
	pb "./output/github.com/grpc/example/helloworld"
)

const (
	address     = "localhost:50051"
	defaultName = "world"
)

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]
	}
	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	defer cancel()
	r, err := c.SayHello(ctx, &pb.HelloRequest{Name: name})
	if err != nil {
		log.Fatalf("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

 

 

 

来源：CSDN

作者：idwtwt

链接：https://blog.csdn.net/idwtwt/article/details/80400598