def _async_setup_component(hass: core.HomeAssistant, domain: str,
config) -> bool:
"""Setup a component for Home Assistant.
This method is a coroutine.
"""
# pylint: disable=too-many-return-statements
if domain in hass.config.components:
return True
setup_lock = hass.data.get('setup_lock')
if setup_lock is None:
setup_lock = hass.data['setup_lock'] = asyncio.Lock(loop=hass.loop)
setup_progress = hass.data.get('setup_progress')
if setup_progress is None:
setup_progress = hass.data['setup_progress'] = []
if domain in setup_progress:
_LOGGER.error('Attempt made to setup %s during setup of %s', domain,
domain)
_async_persistent_notification(hass, domain, True)
return False
try:
# Used to indicate to discovery that a setup is ongoing and allow it
# to wait till it is done.
did_lock = False
if not setup_lock.locked():
yield from setup_lock.acquire()
did_lock = True
setup_progress.append(domain)
config = yield from async_prepare_setup_component(hass, config, domain)
if config is None:
return False
component = loader.get_component(domain)
if component is None:
_async_persistent_notification(hass, domain)
return False
async_comp = hasattr(component, 'async_setup')
try:
if async_comp:
result = yield from component.async_setup(hass, config)
else:
result = yield from hass.loop.run_in_executor(
None, component.setup, hass, config)
except Exception: # pylint: disable=broad-except
_LOGGER.exception('Error during setup of component %s', domain)
_async_persistent_notification(hass, domain, True)
return False
if result is False:
_LOGGER.error('component %s failed to initialize', domain)
_async_persistent_notification(hass, domain, True)
return False
elif result is not True:
_LOGGER.error(
'component %s did not return boolean if setup '
'was successful. Disabling component.', domain)
_async_persistent_notification(hass, domain, True)
loader.set_component(domain, None)
return False
hass.config.components.append(component.DOMAIN)
# Assumption: if a component does not depend on groups
# it communicates with devices
if (not async_comp
and 'group' not in getattr(component, 'DEPENDENCIES', [])):
if hass.pool is None:
hass.async_init_pool()
if hass.pool.worker_count <= 10:
hass.pool.add_worker()
hass.bus.async_fire(EVENT_COMPONENT_LOADED,
{ATTR_COMPONENT: component.DOMAIN})
return True
finally:
setup_progress.remove(domain)
if did_lock:
setup_lock.release()
