记录protobuf和grpc的操作过程

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