many_timers_telegram.py

# all users, key is chat.id
user_settings = {}

# user chat settings
class UserChat:
    timers = {}  # all timers. Key is timer ID, defined arbitrary
    state = None
    id = None  # chat.id

    def tick(self, current_time):
       for timer_name, timer in self.timers.items():
          timer.tick(self, current_time)

class Timer:
    started_at = None
    callback = None  # function to callback, it's argument is UserChat object
    period = None
    pause = False

    def tick(self, settings, current_time):
        if not self.period or self.pause:
            return
        if current_time - self.started_at >= self.period:
            print("Time to send message")
            self.callback(settings)
            self.started_at = current_time


# The cron thread
def queue_manager():
    while True:
        time.sleep(1)
        now = datetime.now()
        for _, settings in user_settings.items():
            settings.tick(now)

wakeup_thread = threading.Thread(target=queue_manager)
wakeup_thread.start()

@bot.message_handler(commands=['on'])
def start_spam(message):
    bot.send_message(message.chat.id, _TR("Starting periodic checks", key="GEN1"))
    print(message.chat.id)
    settings = user_settings.get(message.chat.id, None)
    if not settings:
        settings = UserChat()
        settings.id = message.chat.id
        user_settings[message.chat.id] = settings  
    timer = Timer()
    settings.timers["spam"] = timer
    timer.period = timedelta(minutes=...) # this can be later changed in my_function
    timer.started_at = datetime.now()
    timer.callback = my_function