Discord python：如何为Discord调平系统设置冷却时间？

Question

因此，我遵循了有关如何为Discord机器人设置调平系统的教程，一切正常，直到遇到了如何为该调平系统增加冷却时间的问题。我该怎么办？

我看过很多不同的不和谐教程，并且尝试使用@ commands.cooldown功能，但似乎没有任何效果。重新格式化任何其他代码也有帮助。

@client.event
async def on_message(message):
    if message.author != client.user:
        db = sqlite3.connect('main.sqlite')
        cursor = db.cursor()
        cursor.execute(f"SELECT user_id FROM levels WHERE guild_id = '{message.author.guild.id}' and user_id = '{message.author.id}'")
        result = cursor.fetchone()
        if result is None:
            sql = "INSERT INTO levels(guild_id, user_id, exp, lvl, texp, name) VALUES(?, ?, ?, ?, ?, ?)"
            xp = random.randrange(15, 25)
            val = (message.author.guild.id, message.author.id, xp, 0, xp, message.author.name)
            cursor.execute(sql, val)
            db.commit()
            cursor.execute(
                f"SELECT user_id, exp, lvl, texp FROM levels WHERE guild_id = '{message.author.guild.id}' and user_id = '{message.author.id}'")
            result2 = cursor.fetchone()
            global texptotal
            texptotal = result2[3]
            global xp_start
            xp_start = int(result2[1])
            global lvl_start
            lvl_start = int(result2[2])
            global xp_end
            xp_end = math.floor(5 * (lvl_start ** 2) + 50 * lvl_start + 100)
        else:
            cursor.execute(f"SELECT user_id, exp, lvl, texp FROM levels WHERE guild_id = '{message.author.guild.id}' and user_id = '{message.author.id}'")
            result1 = cursor.fetchone()
            exp = int(result1[1])
            texp = int(result1[3])
            xp = random.randrange(15, 25)
            sql = "UPDATE levels SET exp = ?, texp = ? WHERE guild_id = ? and user_id = ?"
            val = (exp + xp, texp + xp, str(message.guild.id), str(message.author.id))
            cursor.execute(sql, val)
            db.commit()
            cursor.execute(f"SELECT user_id, exp, lvl, texp FROM levels WHERE guild_id = '{message.author.guild.id}' and user_id = '{message.author.id}'")
            result2 = cursor.fetchone()
            texptotal = result2[3]
            xp_start = int(result2[1])
            lvl_start = int(result2[2])
            xp_end = math.floor(5 * (lvl_start ** 2) + 50 * lvl_start + 100)
            if xp_end <= xp_start:
                await message.channel.send(f'{message.author.mention} has leveled up to level {lvl_start + 1}!')
                sql = "UPDATE levels SET lvl = ? WHERE guild_id = ? and user_id = ? "
                val = (int(lvl_start + 1), str(message.guild.id), str(message.author.id))
                cursor.execute(sql, val)
                db.commit()
                sql = "UPDATE levels SET exp = ? WHERE guild_id = ? and user_id = ?"
                val = (0, str(message.guild.id), str(message.author.id))
                cursor.execute(sql, val)
                db.commit()
                cursor.execute(f"SELECT user_id, exp, lvl, texp FROM levels WHERE guild_id = '{message.author.guild.id}' and user_id = '{message.author.id}'")
                result2 = cursor.fetchone()
                xp_start = int(result2[1])
                lvl_start = int(result2[2])
                xp_end = 5 * (lvl_start ** 2) + 50 * lvl_start + 100
                cursor.close()
                db.close()