Toggle keyboard led according to PulseAudio/Pipewire mic muted/unmuted state [HP ProBook 450 G10]

mic-led.py

#!/usr/bin/env python3

# required `light` utility and correct configuration of its parameters
# in `update_keyboard_mic_mute_led` function
# the current settings work on HP ProBook 450 G10

import time
import subprocess
from subprocess import Popen

from pulsectl import Pulse, PulseLoopStop, PulseDisconnected


def spawn(cmd):  # doen't block
    Popen([cmd], shell=True)

def sh(cmd):  # synchronous, do not use in the actions
  #print(cmd)
  try:
    output = subprocess.check_output(cmd, shell=True)
    return output.decode()
  except:
    return ''


def update_keyboard_mic_mute_led():
    muted = 'yes' in sh('pactl get-source-mute @DEFAULT_SOURCE@')
    print(f'muted? {muted}')
    if muted:
        sh('light -s sysfs/leds/hda::micmute -S 0')
    else:
        sh('light -s sysfs/leds/hda::micmute -S 100')

def event_callback(ev):
    if ev.t == 'change':
        if ev.facility == 'sink_input':
            print(f"Sink input event: {ev.index}")
        elif ev.facility == 'source_output':
            print(f"Source output event: {ev.index}")
        if ev.facility == 'source':
            #print(f"Source event: {ev.index}")
            if ev.index == default_source_id:  # mic status change
                print(f"default source event")
                update_keyboard_mic_mute_led()
        elif ev.facility == 'server':
            print("Server event")



while True:
    try:
        default_sink_id = int(sh('pactl list sinks short | grep `pactl get-default-sink`').strip().split('\t')[0].strip())
        default_source_id = int(sh('pactl list sources short | grep `pactl get-default-source`').strip().split('\t')[0].strip())
        print(f'default_source_id {default_source_id}')
    except:
        print('audio subsystem seems to be stopped, restart')
        time.sleep(0.100)
        continue
    update_keyboard_mic_mute_led()
    # create a PulseAudio client
    print('start monitoring')
    with Pulse('event-monitor') as pulse:
        # Set the event callback
        pulse.event_callback = event_callback
        # Subscribe to events
        pulse.event_mask_set('all')
        # Start event listening loop
        try:
            for ev in pulse.event_listen():
                pass  # events are handled by the `event_callback`
        except PulseLoopStop:
            print('error occured, restart')
            pass
        except PulseDisconnected:
            print('error occured, restart')
            pass
    time.sleep(0.100)