GRPC的简单使用实例

目录结构

grpc (根目录)
       |-- server.go
       |-- client.go
       |-- go.mod
       |-- helloworld
       |---- helloworld.proto
       |---- helloworld.pb.go

环境

初始化 go module

go mod init server

安装 Protocol
安装该协议编译器用来生成 gRPC 服务代码。https://github.com/google/protobuf/releases下载

tar -xvf protobuf-all-3.13.0.tar.gz
cd protobuf-3.13.0

./configure –prefix=/usr/local/

sudo make  #要编译很久
sudo make check
sudo make install

make install后可能出错

protoc: error while loading shared libraries: libprotoc.so.24: cannot open shared object file: No such file or directory

执行下ldconfig即可
然后protoc --version正常可输出版本后，环境就准备好了

消息体

创建helloworld.proto

syntax = "proto3";

package helloworld;
// 服务端定义
service Greeter {
// 服务端返馈信息方法
rpc SayHello (HelloRequest) returns (HelloReply) {}
}
// 包含用户名的请求信息
message HelloRequest {
string name = 1;
}
// 服务端响应信息
message HelloReply {
string message = 1;
}

然后使用protoc命令，执行以下命令生成helloworld.pb.go

protoc --proto_path=helloworld --go_out=plugins=grpc:helloworld helloworld/helloworld.proto

服务端

server.go

package main

import (
    "context"
    "fmt"
    "google.golang.org/grpc"
    "log"
    "net"
    pb "server/helloworld"
)

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) {
    log.Printf("Received: %v", in.Name)
    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{})
    fmt.Println("启动服务",port)
    if err := s.Serve(lis); err != nil {
        log.Fatalf("failed to serve: %v", err)
    }
}

启动服务端服务go run server.go

客户端

client.go

package main

import (
    "golang.org/x/net/context"
    "google.golang.org/grpc"
    "log"
    "os"
    pb "server/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]
    }
    r, err := c.SayHello(context.Background(), &pb.HelloRequest{Name: name})
    log.Print(r)
    if err != nil {
        log.Fatalf("could not greet: %v", err)
    }
    log.Printf("Greeting: %s", r.Message)
}

启动客户端服务go run client.go

• Go新手，有错误的地方帮忙指正，感谢。

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