Build cloud-native applications using the Golang microservices framework

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.

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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