Lock tables in cron

	CalculatePP             bool

	FixScoreDuplicates      bool `description:"might take a VERY long time"`

	Lock       bool `description:"Do this in prod if you have a lot of users. It will avoid memes of leaderboard update, but it will be slower (no multi mysql connections)"`

	LogQueries bool `description:"You don't wanna do this in prod."`

	Workers    int  `description:"The number of goroutines which should execute queries. Increasing it may make cron faster, depending on your system."`

}

	defer db.Close()

	// spawn some workers

	if c.Lock {

		c.Workers = 1

	}

	fmt.Print("Spawning necessary workers...")

	for i := 0; i < c.Workers; i++ {

		chanWg.Add(1)

	timeAtStart := time.Now()

	if c.Lock {

		locks := "LOCK TABLES "

		for _, i := range []string{"leaderboard_std", "leaderboard_ctb", "leaderboard_mania", "leaderboard_taiko", "users_stats", "scores", "users", "password_recovery"} {

			locks += i + " WRITE, "

		}

		locks = locks[:len(locks)-2]

		_, err = db.Exec(locks)

		if err != nil {

			queryError(err, locks)

			return

		}

		db.SetMaxOpenConns(1)

	}

	if c.CalculateAccuracy {

		fmt.Print("Starting accuracy calculator worker...")

		wg.Add(1)

	color.Green("Data elaboration has been terminated.")

	color.Green("Execution time: %.4fs", time.Now().Sub(timeAtStart).Seconds())

	color.Yellow("Waiting for workers to finish...")

	op("UNLOCK TABLES")

	close(execOperations)

	chanWg.Wait()

}

}

// Operations that can be executed with a simple db.Exec, distributed across 8 workers.

var execOperations = make(chan operation, 10000)

var execOperations = make(chan operation, 100000)

func worker() {

	for op := range execOperations {