按时间抽奖流程伪代码

package main

import (
	"database/sql"
	"fmt"
	"log"
	"math/rand"
	"time"

	_ "github.com/go-sql-driver/mysql"
)

type Lottery struct {
	ID          int
	PublishType int
	IsPublished bool
	PublishTime time.Time
}

type Winner struct {
	LotteryID int
	UserID    int
	Prize     string
}

func main() {
	for {
		// 获取当前时间
		currentTime := time.Now()

		// 查询满足条件的抽奖
		lotteries := queryLotteries(currentTime)

		// 遍历每一个抽奖
		for _, lottery := range lotteries {
			// 开奖，根据抽奖规则以及参与抽奖用户表，得到最终的获奖名单winners
			winners := drawLottery(lottery)

			// 生成开奖结果列表，可以包含每个中奖者的相关信息，例如中奖者的用户ID、奖品名称、奖品等级等。
			resultList := generateResultList(winners)

			// 将中奖结果写入lottery_result表
			writeResultToDB(resultList)

			// 更新抽奖状态为"已开奖"
			updateLotteryStatus(lottery.ID)

			// 执行开奖结果通知任务
			// TODO 通知MQ队列
			notifyWinners(resultList)
		}

		// 暂停一分钟
		time.Sleep(time.Minute)
	}
}

// 得到可以开奖的lottery
func queryLotteries(currentTime time.Time) []Lottery {
	// 连接数据库
	db, err := sql.Open("mysql", "username:password@tcp(hostname:port)/database")
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()

	// 执行SQL查询
	query := "SELECT id, publish_type, is_published, publish_time FROM lottery WHERE publish_type = 1 AND !is_published AND publish_time <= ?"
	rows, err := db.Query(query, currentTime)
	if err != nil {
		log.Fatal(err)
	}
	defer rows.Close()

	var lotteries []Lottery

	// 遍历查询结果
	for rows.Next() {
		var lottery Lottery
		err := rows.Scan(&lottery.ID, &lottery.PublishType, &lottery.IsPublished, &lottery.PublishTime)
		if err != nil {
			log.Fatal(err)
		}
		lotteries = append(lotteries, lottery)
	}

	return lotteries
}

func drawLottery(lottery Lottery) []Winner {
	// 连接数据库
	db, err := sql.Open("mysql", "username:password@tcp(hostname:port)/database")
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()

	// 查询参与抽奖的用户
	query := "SELECT user_id FROM lottery_participants WHERE lottery_id = ?"
	rows, err := db.Query(query, lottery.ID)
	if err != nil {
		log.Fatal(err)
	}
	defer rows.Close()

	var participants []int

	// 遍历查询结果
	for rows.Next() {
		var userID int
		err := rows.Scan(&userID)
		if err != nil {
			log.Fatal(err)
		}
		participants = append(participants, userID)
	}

	/////////////////// TODO 得到抽奖规则，根据抽奖规则最终得到获奖者名单
	// 随机选择中奖者
	rand.Seed(time.Now().UnixNano())
	numWinners := 1 // 假设每次抽奖只有一个中奖者
	winners := make([]Winner, numWinners)

	for i := 0; i < numWinners; i++ {
		// 随机选择一个参与者
		randomIndex := rand.Intn(len(participants))
		winnerUserID := participants[randomIndex]

		// 创建中奖者对象
		winner := Winner{
			LotteryID: lottery.ID,
			UserID:    winnerUserID,
			Prize:     "奖品名称", // 假设奖品名称为固定值
		}

		winners[i] = winner

		// 从参与者列表中移除已中奖的用户
		participants = append(participants[:randomIndex], participants[randomIndex+1:]...)
	}

	return winners
}

func generateResultList(winners []Winner) []string {
	resultList := make([]string, len(winners))

	for i, winner := range winners {
		result := fmt.Sprintf("中奖者：%d，奖品：%s", winner.UserID, winner.Prize)
		resultList[i] = result
	}

	return resultList
}

func writeResultToDB(resultList []string) {
	// 连接数据库
	db, err := sql.Open("mysql", "username:password@tcp(hostname:port)/database")
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()

	// 准备插入数据的SQL语句
	query := "INSERT INTO lottery_result (result) VALUES (?)"

	// 开始事务
	tx, err := db.Begin()
	if err != nil {
		log.Fatal(err)
	}

	// 执行插入操作
	for _, result := range resultList {
		_, err := tx.Exec(query, result)
		if err != nil {
			// 发生错误，回滚事务
			tx.Rollback()
			log.Fatal(err)
		}
	}

	// 提交事务
	err = tx.Commit()
	if err != nil {
		log.Fatal(err)
	}
}

func updateLotteryStatus(lotteryID int) {
	// 连接数据库
	db, err := sql.Open("mysql", "username:password@tcp(hostname:port)/database")
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()

	// 准备更新数据的SQL语句
	query := "UPDATE lottery SET is_published = true WHERE id = ?"

	// 执行更新操作
	_, err = db.Exec(query, lotteryID)
	if err != nil {
		log.Fatal(err)
	}
}

func notifyWinners(resultList []string) {
	// 执行开奖结果通知任务，可以是发送通知消息或邮件等操作
	// ...
	// TODO 通知MQ队列
}