golang 进行grpc调用

参考https://blog.csdn.net/qq_32744005/article/details/105606383

go get google.golang.org/grpc

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

[root@localhost helloworld]# echo $GOPATH
/usr/local/go/workspacego

cd /usr/local/go/workspacego/src/google.golang.org/grpc/examples/helloworld/helloworld

[root@localhost helloworld]# cat /data/wwwroot/grpcdemo/client.go

package main

import (
        "context"
        "log"
        "os"
        "time"
        "google.golang.org/grpc"                                       //grpc 的包
        pb "google.golang.org/grpc/examples/helloworld/helloworld"     //生产的中间文件
)

const (
        address     = "localhost:50051"      //ip + port
        defaultName = "world"              
)

func main() {
        // Set up a connection to the server.
        conn, err := grpc.Dial(address, grpc.WithInsecure(), grpc.WithBlock())
        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.GetMessage())
}

　　[root@localhost helloworld]# cat /data/wwwroot/grpcdemo/server.go

package main

import (
        "context"
        "log"
        "net"

        "google.golang.org/grpc"
        pb "google.golang.org/grpc/examples/helloworld/helloworld"
)

const (
        port = ":50051"
)

// server is used to implement helloworld.GreeterServer.
type server struct {
        pb.UnimplementedGreeterServer
}

// SayHello implements helloworld.GreeterServer
func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
        log.Printf("Received: %v", in.GetName())
        return &pb.HelloReply{Message: "Hello " + in.GetName()}, 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{})
        if err := s.Serve(lis); err != nil {
                log.Fatalf("failed to serve: %v", err)
        }
}

　　

#go run /data/wwwroot/grpcdemo/server.go

另外发起一个终端

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#go run /data/wwwroot/grpcdemo/client.go

服务端返回

2020/05/12 17:33:56 Received: world

客户端返回

2020/05/12 17:33:56 Greeting: Hello world