package main import ( "database/sql" "math" "sync" "time" "github.com/bwmarrin/discordgo" _ "github.com/mattn/go-sqlite3" ) var db *sql.DB var lastMessage = make(map[string]time.Time) var incrementMutex = sync.Mutex{} func init() { var err error db, err = sql.Open("sqlite3", "./bot.db") if err != nil { panic(err) } db.SetMaxOpenConns(1) db.Exec("CREATE TABLE xp(id STRING NOT NULL UNIQUE, xp INTEGER NOT NULL)") } func incrementXP(dg *discordgo.Session, discordID string) { amountToIncrement := calculateIncrement(discordID) tx, err := db.Begin() if err != nil { logError(dg, "incrementXP", "begin", discordID, err) return } _, err = tx.Exec("INSERT INTO xp(id, xp) VALUES(?, ?) ON CONFLICT(id) DO UPDATE SET xp = xp+?;", discordID, amountToIncrement, amountToIncrement) if err != nil { logError(dg, "incrementXP", "insert", discordID, err) tx.Rollback() return } err = tx.Commit() if err != nil { logError(dg, "incrementXP", "commit", discordID, err) return } } func calculateIncrement(discordID string) int { incrementMutex.Lock() defer incrementMutex.Unlock() now := time.Now() delta := now.Sub(lastMessage[discordID]) lastMessage[discordID] = now if delta.Seconds() < 0 { return 0 } //Constructed on Desmos: //y=\frac{100}{\left(1+e^{-\left(\frac{x-15}{3}\right)}\right)} return int(100 / (1 + math.Pow(math.E, -((delta.Seconds()-15)/3)))) }