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With the continuous development of the Internet, grabbing red envelopes has become a very popular social activity, especially in the era of mobile Internet. Now, let’s introduce how to use golang to implement a simple red envelope grabbing system.
We need to implement the following functions:
In order to achieve the above requirements, we need to choose the appropriate technology, as follows:
We need to create the following two tables:
We can divide the entire system into the following modules:
The following are the detailed steps to implement the red envelope grabbing system in golang:
5.1 Create red envelope
Implementation Process:
Code implementation:
func generateRedPackage(totalAmount float64, num int32, redPackageType int32) ([]*RedPackage, error) { // 验证红包金额和个数是否合法 if totalAmount <= 0 || num <= 0 { return nil, errors.New("红包金额或个数不能小于等于0") } // 计算平均值 avgAmount := totalAmount / float64(num) // 生成红包码 redPackageCodes := make([]string, num) for i := 0; i < len(redPackageCodes); i++ { code := generateRedPackageCode() redPackageCodes[i] = code } // 分配红包金额 redPackages := make([]*RedPackage, num) for i := 0; i < len(redPackages); i++ { redPackages[i] = &RedPackage{ Code: redPackageCodes[i], Amount: avgAmount, RedPackageType: redPackageType, } totalAmount -= avgAmount if i == len(redPackages) - 1 { redPackages[i].Amount += totalAmount break } redPackages[i].Amount += avgAmount } // 存入数据库和 Redis 缓存中 return redPackages, nil }
5.2 Grabbing red envelopes
Implementation process:
Code implementation:
func getRedPackage(code string, userId int64) (*RedPackage, error) { // 先从缓存中获取该红包的金额 rc := redisMgr.RedisClient() redPackageAmount, err := rc.RPop(code).Result() if err != nil { return nil, errors.New("红包已经被抢完了") } // 判断用户是否已经抢到过该红包 key := fmt.Sprintf("%s:%d", code, userId) result, err := rc.Exists(key).Result() if err != nil || result == 1 { return nil, errors.New("您已经抢过该红包了") } // 生成抢红包记录 record := &RedPackageRecord{ RedPackageCode: code, UserId: userId, Amount: redPackageAmount, CreateTime: time.Now(), } // 将抢红包记录和金额存入 MySQL 数据库中 err = dbMgr.SaveRedPackageRecord(record) if err != nil { return nil, err } // 将金额存入用户账户中 err = dbMgr.UpdateUserAmount(userId, redPackageAmount) if err != nil { return nil, err } // 返回抢到的红包金额 redPackage := &RedPackage{ Code: code, Amount: redPackageAmount, } return redPackage, nil }
Through the above steps, we have completed the implementation of a simple red envelope grabbing system. In actual development, issues such as system security, stability, and performance also need to be considered, and more detailed testing and performance optimization are required to ensure that the system can meet user needs during operation.
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