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Build cloud-native applications using the Golang microservices framework

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2024-06-02 10:41:57964browse

When building cloud-native applications using the Golang microservices framework, the preferred frameworks include: gRPC: suitable for RPC-based microservices, mature and efficient. Go kit: A lightweight framework that provides a modular toolset for building microservices.

使用 Golang 微服务框架构建云原生应用程序

Building cloud-native applications using the Golang microservices framework

When building modern cloud-native applications, microservices architecture has become mainstream. This article walks you through building and deploying a simple cloud-native application using the popular Golang microservices framework.

Choose a Microservices Framework

There are several microservices frameworks available for Golang, but the two most popular are:

  • gRPC: A mature and efficient framework for RPC-based microservices.
  • Go kit: A lightweight framework that provides a modular toolset for building microservices.

Set up Golang project

  1. Install Golang and initialize a new project using the following command:

    go mod init myapp
  2. Add required dependencies:

    go get github.com/grpc-ecosystem/go-grpc-middleware/v2/interceptors/logging

Build microservices

  1. Using gRPC :

    import google.golang.org/protobuf/proto
    import google.golang.org/grpc
    import google.golang.org/grpc/codes
    import google.golang.org/grpc/status
    
    // 定义服务
    type GreeterService struct{}
    
    func (s *GreeterService) SayHello(context.Context, *HelloRequest) (*HelloReply, error) {
      return &HelloReply{Message: "Hello, " + request.GetName()}, nil
    }
    
    func main() {
      // 创建 gRPC 服务器
      server := grpc.NewServer(grpc.UnaryInterceptor(grpc_middleware.ChainUnaryServer(
     grpc_middleware.WithUnaryServerChainCode(
       func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
         fmt.Printf("Received request for %s", info.FullMethod)
         return handler(ctx, req)
       },
     ),
     grpc_middleware.WithUnaryServerChainCode(
       func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
         resp, err = handler(ctx, req)
         if err != nil {
           code := status.Code(err)
           if code == codes.Unknown || code == codes.Internal {
             err = status.Error(500, err.Error())
           }
         }
         return
       },
     ),
      )))
    
      // 注册服务
      RegisterGreeterServiceServer(server, &GreeterService{})
    }
  2. Using Go kit:

    import github.com/go-kit/kit/endpoint
    import github.com/go-kit/kit/transport/http
    import github.com/gorilla/mux
    import net/http
    
    // 定义服务端点
    var sayHelloEndpoint = MakeSayHelloEndpoint(svc)
    
    // 定义 HTTP 处理程序
    func SayHelloHandler(w http.ResponseWriter, r *http.Request) {
      var request HelloRequest
      if err := json.NewDecoder(r.Body).Decode(&request); err != nil {
     http.Error(w, err.Error(), http.StatusBadRequest)
     return
      }
    
      response, err := sayHelloEndpoint(context.Background(), request)
      if err != nil {
     http.Error(w, err.Error(), http.StatusInternalServerError)
     return
      }
    
      w.Header().Set("Content-Type", "application/json")
      if err := json.NewEncoder(w).Encode(response); err != nil {
     http.Error(w, err.Error(), http.StatusInternalServerError)
     return
      }
    }
    
    func main() {
      r := mux.NewRouter()
      r.Handle("/hello", http.NewServer(sayHelloEndpoint, decodeSayHelloRequest, encodeSayHelloResponse))
    
      srv :=  http.Server{
     Addr:    ":8080",
     Handler: r,
      }
    
      srv.ListenAndServe()
    }

Practical case

Create a simple microservice that provides a "Hello" API that can be accessed via HTTP or gRPC.

Deploy to a cloud platform

Use a containerization tool (such as Docker) to containerize the application and deploy it to a cloud platform (such as Kubernetes).

Conclusion

With this article, you should understand how to build and deploy cloud-native applications using the Golang microservices framework.

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