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80 lines
2.7 KiB
Python
80 lines
2.7 KiB
Python
"""Utility functions for HA core."""
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import logging
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from collections.abc import Awaitable, Callable
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from homeassistant.core import HomeAssistant, ServiceCall
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from homeassistant.util.read_only_dict import ReadOnlyDict
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from .adaptation_utils import ServiceData
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_LOGGER = logging.getLogger(__name__)
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def setup_service_call_interceptor(
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hass: HomeAssistant,
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domain: str,
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service: str,
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intercept_func: Callable[[ServiceCall, ServiceData], Awaitable[None] | None],
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) -> Callable[[], None]:
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"""Inject a function into a registered service call to preprocess service data.
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The injected interceptor function receives the service call and a writeable data dictionary
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(the data of the service call is read-only) before the service call is executed.
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"""
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try:
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# HACK: Access protected attribute of HA service registry.
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# This is necessary to replace a registered service handler with our
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# proxy handler to intercept calls.
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registered_services = (
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hass.services._services # pylint: disable=protected-access
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)
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except AttributeError as error:
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msg = (
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"Intercept failed because registered services are no longer"
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" accessible (internal API may have changed)"
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)
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raise RuntimeError(msg) from error
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if domain not in registered_services or service not in registered_services[domain]:
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msg = f"Intercept failed because service {domain}.{service} is not registered"
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raise RuntimeError(msg)
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existing_service = registered_services[domain][service]
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async def service_func_proxy(call: ServiceCall) -> None:
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try:
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# Convert read-only data to writeable dictionary for modification by interceptor
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data = dict(call.data)
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# Call interceptor
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await intercept_func(call, data)
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# Convert data back to read-only
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call.data = ReadOnlyDict(data)
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except Exception:
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# Blindly catch all exceptions to avoid breaking light.turn_on
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_LOGGER.exception(
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"Error for call '%s' in service_func_proxy",
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call.data,
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)
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# Call original service handler with processed data
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await existing_service.job.target(call)
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hass.services.async_register(
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domain,
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service,
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service_func_proxy,
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existing_service.schema,
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)
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def remove():
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# Remove the interceptor by reinstalling the original service handler
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hass.services.async_register(
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domain,
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service,
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existing_service.job.target,
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existing_service.schema,
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)
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return remove
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