GRPC的使用

zhangsansan957發表於2020-09-29

目錄結構

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

環境

初始化 go module

go mod init server

安裝 Protocol
安裝該協議編譯器用來生成 gRPC 服務程式碼。https://github.com/google/protobuf/releases下載

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

./configure –prefix=/usr/local/

sudo make  #要編譯很久
sudo make check
sudo make install

make install後可能出錯

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

執行下ldconfig即可
然後protoc --version正常可輸出版本後,環境就準備好了

訊息體

建立helloworld.proto

syntax = "proto3";

package helloworld;
// 服務端定義
service Greeter {
// 服務端返饋資訊方法
rpc SayHello (HelloRequest) returns (HelloReply) {}
}
// 包含使用者名稱的請求資訊
message HelloRequest {
string name = 1;
}
// 服務端響應資訊
message HelloReply {
string message = 1;
}

然後使用protoc命令,執行以下命令生成helloworld.pb.go

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

服務端

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("啟動服務",port)
    if err := s.Serve(lis); err != nil {
        log.Fatalf("failed to serve: %v", err)
    }
}

啟動服務端服務go run server.go
grpc-1

客戶端

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)
}

啟動客戶端服務go run client.go
grpc-2

  • Go新手,有錯誤的地方幫忙指正,感謝。
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