golang框架在高并发场景中的微服务实践

// proto/greeter/greeter.proto
syntax = "proto3";
package greeter;
service Greeter {
  rpc SayHello(HelloRequest) returns (HelloResponse) {}
}
message HelloRequest {
  string name = 1;
}
message HelloResponse {
  string message = 1;
}

// greeter-service/main.go
package main

import (
    "context"
    "fmt"
    "log"
    "net"

    pb "github.com/example/greeter/proto"
    "google.golang.org/grpc"
)

type greeterServer struct{}

func (s *greeterServer) SayHello(ctx context.Context, req *pb.HelloRequest) (*pb.HelloResponse, error) {
        fmt.Println("Received request: ", req.GetName())
        return &pb.HelloResponse{Message: "Hello " + req.GetName()}, nil
}

func main() {
        lis, err := net.Listen("tcp", "localhost:9000")
        if err != nil {
                log.Fatalf("failed to listen: %v", err)
        }
        s := grpc.NewServer()
        pb.RegisterGreeterServer(s, &greeterServer{})
        if err := s.Serve(lis); err != nil {
                log.Fatalf("failed to serve: %v", err)
        }
}

// greeter-client/main.go
package main

import (
        "context"
        "fmt"
        "log"
        "time"

        pb "github.com/example/greeter/proto"
        "google.golang.org/grpc"
)

func main() {
        conn, err := grpc.Dial("localhost:9000", grpc.WithInsecure())
        if err != nil {
                log.Fatalf("failed to dial: %v", err)
        }
        defer conn.Close()
        client := pb.NewGreeterClient(conn)
        for i := 0; i < 1000; i++ {
                ctx, cancel := context.WithTimeout(context.Background(), time.Second)
                defer cancel()
                r, err := client.SayHello(ctx, &pb.HelloRequest{Name: fmt.Sprintf("Client %d", i)})
                if err != nil {
                        log.Fatalf("could not greet: %v", err)
                }
                log.Printf("Greeting: %s", r.GetMessage())
        }
}