81ca978413
* Move mqtt from eventbus to dispatcher / add unsub for dispatcher * Fix lint * Fix test * Fix lint v2 * fix dispatcher_send
66 lines
1.9 KiB
Python
66 lines
1.9 KiB
Python
"""Helpers for hass dispatcher & internal component / platform."""
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import logging
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from homeassistant.core import callback
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from homeassistant.util.async import run_callback_threadsafe
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_LOGGER = logging.getLogger(__name__)
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DATA_DISPATCHER = 'dispatcher'
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def dispatcher_connect(hass, signal, target):
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"""Connect a callable function to a singal."""
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async_unsub = run_callback_threadsafe(
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hass.loop, async_dispatcher_connect, hass, signal, target).result()
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def remove_dispatcher():
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"""Remove signal listener."""
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run_callback_threadsafe(hass.loop, async_unsub).result()
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return remove_dispatcher
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@callback
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def async_dispatcher_connect(hass, signal, target):
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"""Connect a callable function to a singal.
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This method must be run in the event loop.
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"""
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if DATA_DISPATCHER not in hass.data:
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hass.data[DATA_DISPATCHER] = {}
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if signal not in hass.data[DATA_DISPATCHER]:
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hass.data[DATA_DISPATCHER][signal] = []
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hass.data[DATA_DISPATCHER][signal].append(target)
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@callback
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def async_remove_dispatcher():
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"""Remove signal listener."""
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try:
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hass.data[DATA_DISPATCHER][signal].remove(target)
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except (KeyError, ValueError):
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# KeyError is key target listener did not exist
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# ValueError if listener did not exist within signal
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_LOGGER.warning(
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"Unable to remove unknown dispatcher %s", target)
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return async_remove_dispatcher
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def dispatcher_send(hass, signal, *args):
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"""Send signal and data."""
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hass.add_job(async_dispatcher_send, hass, signal, *args)
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@callback
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def async_dispatcher_send(hass, signal, *args):
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"""Send signal and data.
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This method must be run in the event loop.
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"""
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target_list = hass.data.get(DATA_DISPATCHER, {}).get(signal, [])
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for target in target_list:
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hass.async_add_job(target, *args)
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