Changing the run time that a callback is triggered

Third party integrations AppDaemon
1

I want to use an input_datetime to define the time a callback is triggered.
Since the initialize function will set the callback function to run at the time input_datetime was at the time the function is called, how would i update the callback time dynamically?

Thanks!

2

Set the time according to your input_datetime in the initialize function. Then listen for state change for your input_datetime, cancel the current callback, add a new one whenever the input_datetime is changed.
So, apart from what you already have, you would need to add:

# In the initialize function:
self.callback_handle = run_at... #Your run function goes here.
self.listen_state(self.update_callback_time, "input_datetime.your_datetime")

def update_callback_time((self, entity, attribute, old, new, kwargs):
  # Cancel the current timer:
  cancel_timer(self, self._callback_handle)
  ## Add code to update the run function.
  self.callback_handle = run_at... #Your run function goes here.
3 
import hassapi as hass
import datetime
import time

#App to turn on lights gradually
#Args:
#time: the time at which we want to turn the light on
#light: the light we want to turn on

class WakeUpLights(hass.Hass):
    def initialize(self):
        self.light = self.args["light"]

        time_entity = self.args["time"]
        time = self.get_state(time_entity)

        self.callback_handle = self.run_daily(self.wake_up, time)
        self.listen_state(self.update_callback_time, time_entity)

    def wake_up(self, kwargs):
        self.turn_on(self.light,brightness=20, color_temp = 500)
        for i in range(40,255,20):
            self.turn_on(self.light,brightness=i, color_temp = 500)
            time.sleep(120)

    def update_callback_time(self, entity, attribute, old, new, kwargs):
        self.cancel_timer(self.callback_handle)
        self.callback_handle = self.run_daily(self.wake_up, new)

Thanks! works perfectly. It also helped me to understand how the callbacks work better.
One last thing, i saw in the docs that you should not use time.sleep() so as not to tie up the thread.
In this case would recursion with run_in() work well?

Thanks again for your help

4

Great that you got it working! You should look into using async programming in the appdaemon docs. Then you can use asyncio.sleep, but yes, recursive run_in would work.

Here is more on async: https://realpython.com/async-io-python/

As it is now, the time.sleep(120) call will block the running thread.

1 Like
5

I will definitely do that!.
Thanks again for all your help.
Much appreciated