Go language development of door-to-door cooking system: How to implement order payment function?

Go language development of door-to-door cooking system: How to implement the order payment function?

With the improvement of living standards, more and more people choose to enjoy delicious food at home, and the door-to-door cooking system has emerged. In this system, users can choose their favorite dishes through a mobile app and then wait for the chef to come to make them. In this process, the order payment function is an indispensable part. This article will introduce how to use Go language to develop and implement the order payment function, and provide specific code examples.

First of all, we need to clarify the order payment process. Generally speaking, after a user places an order, the system will generate a unique order number and store the order information in the database. After the user selects the payment method, he will be redirected to the third-party payment platform for payment operations. After the payment is successful, the third-party payment platform will call back the system interface to notify the order of successful payment. The system updates the order status based on the callback information and generates a notification of successful payment.

Next, we start writing code. First we need to introduce the relevant Go packages. We will use the gin framework to build web services and gorm to operate the database.

import (
    "github.com/gin-gonic/gin"
    "gorm.io/driver/mysql"
    "gorm.io/gorm"
)

Then, we need to define the database model and database connection.

type Order struct {
    gorm.Model
    OrderNo  string
    Total    float64
    Status   int
    PayType  string
}

var db *gorm.DB

func initDB() {
    dataSource := "your-database-connection-string"
    db, _ = gorm.Open(mysql.Open(dataSource), &gorm.Config{})
    db.AutoMigrate(&Order{})
}

Call initDB in the main function to establish a database connection. Then, we need to write an order interface.

func PlaceOrder(c *gin.Context) {
    // 解析请求参数
    var order Order
    if err := c.ShouldBindJSON(&order); err != nil {
        c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
        return
    }

    // 生成订单号
    order.OrderNo = generateOrderNo()

    // 保存订单信息到数据库
    result := db.Create(&order)
    if result.Error != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create order"})
        return
    }

    // 根据支付方式选择支付平台并生成支付链接
    payURL := generatePayURL(order.PayType, order.OrderNo, order.Total)

    // 返回支付链接给客户端
    c.JSON(http.StatusOK, gin.H{"pay_url": payURL})
}

Next, we need to write a callback interface to receive callback information from the payment platform.

func Callback(c *gin.Context) {
    var callback CallbackData
    if err := c.ShouldBindJSON(&callback); err != nil {
        c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
        return
    }

    // 获取订单信息
    var order Order
    result := db.Where("order_no = ?", callback.OrderNo).First(&order)
    if result.Error != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to find order"})
        return
    }

    // 更新订单状态
    order.Status = callback.Status
    result = db.Save(&order)
    if result.Error != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to update order"})
        return
    }

    // 生成支付成功通知
    notify := generatePayNotify(order)
    // TODO: 发送支付成功通知

    c.JSON(http.StatusOK, gin.H{"message": "Callback successfully processed"})
}

Finally, register the relevant routes in the main function.

func main() {
    initDB()

    router := gin.Default()
    router.POST("/place-order", PlaceOrder)
    router.POST("/callback", Callback)

    router.Run(":8080")
}

The above is the implementation of the order payment function of the door-to-door cooking system developed using Go language. The code sample can be used as a reference, and the specific business needs to be adjusted and expanded according to the actual situation. I hope this article can be helpful to your development work!

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