How to develop a simple online subscription system using Go language

In today's digital era, subscription systems have become a common application in all walks of life. It provides businesses and individuals with a convenient way to provide services and obtain information. With the continuous development of technology, we can use different programming languages ​​​​to develop various subscription systems. This article will introduce how to use Go language to develop a simple online subscription system.

1. Preparation

Before starting, first make sure that the Go language development environment has been installed. The latest version of the Go language can be downloaded and installed on the official website. In addition, we need a text editor to write Go code. Most developers will choose to use editors such as VS Code, Sublime Text or Atom.

2. Create the project structure

Before you start writing code, you need to create a project folder and create the following files and folders in it:

• main.go: This file is the entry file of the Go program and contains the system startup code.
• handlers folder: used to store processing functions for processing HTTP requests.
• models folder: used to define the data models required in the system.
• config.go: used to store system configuration information, such as database connection information, etc.

3. Define the data model

In the models folder, we can define the data models needed in the system, such as users, subscription plans, etc. Take the user model as an example:

package models

type User struct {
    ID       int
    Name     string
    Email    string
    Password string
    Subscriptions []Subscription
}

type Subscription struct {
    ID          int
    PlanID      int
    UserID      int
    Active      bool
    ExpiryDate  string
}

4. Processing HTTP requests

In the handlers folder, we can define the processing function for processing HTTP requests. For example, the processing functions for user registration and subscription are as follows:

package handlers

import (
    "net/http"
    "encoding/json"
    "io/ioutil"
    "strconv"
    "github.com/gorilla/mux"
    "yourapp/models"
)

func RegisterUserHandler(w http.ResponseWriter, r *http.Request) {
    var user models.User
    body, _ := ioutil.ReadAll(r.Body)
    err := json.Unmarshal(body, &user)
    // 处理用户注册逻辑
    // ...
}

func SubscribeHandler(w http.ResponseWriter, r *http.Request) {
    vars := mux.Vars(r)
    userID, _ := strconv.Atoi(vars["userID"])
    planID, _ := strconv.Atoi(vars["planID"])
    // 处理订阅逻辑
    // ...
}

5. Business logic implementation

In the main file main.go, we can write the system startup code, including routing settings, Database connections, logging, etc. It should be noted that third-party routing libraries and database driver packages need to be introduced, such as gorilla/mux and gorm.

package main

import (
    "net/http"
    "yourapp/handlers"
    "github.com/gorilla/mux"
    "github.com/jinzhu/gorm"
    _ "github.com/jinzhu/gorm/dialects/mysql"
)

func main() {
    router := mux.NewRouter()
    router.HandleFunc("/register", handlers.RegisterUserHandler).Methods("POST")
    router.HandleFunc("/subscribe/{userID}/{planID}", handlers.SubscribeHandler).Methods("POST")

    // 连接数据库
    db, err := gorm.Open("mysql", "user:password@/dbname?charset=utf8&parseTime=True&loc=Local")
    if err != nil {
        panic("failed to connect database")
    }
    defer db.Close()

    // 日志记录
    // ...

    http.ListenAndServe(":8080", router)
}

6. Testing and Deployment

After writing the code, we can perform local testing and simulate HTTP requests through tools such as curl or Postman to verify whether the system functions normally. If everything is normal, you can start preparing to deploy the system to the online server.

Before deployment, you need to ensure that the Go language operating environment has been installed on the server and the dependent libraries required by the system have been installed. You can use the go build command to compile an executable file, and then use the nohup command to run the system in the background.

Conclusion

Through this article, we learned how to use Go language to develop a simple online subscription system. Of course, this is just a preliminary example, and more functions and security may need to be considered in actual projects. I hope this article can provide some help to developers who want to use Go language to develop subscription systems.

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