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Authored by dcaro on Nov 25 2021, 3:31 PM.

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	F34767031: raw-paste-data.txt
	Nov 25 2021, 3:31 PM

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	@classmethod
	def from_file(cls, configfile: Optional[Path], overrides: Dict[str, Any]) -> "ControllerConfig":
	try:
	data = yaml.safe_load(configfile.read_text()) if configfile is not None else {}

	except FileNotFoundError as error:
	LOGGER.exception("Configuration file %s is not a file: %s", configfile, error)

	except yaml.error.YAMLError as error:
	LOGGER.exception("Configuration file %s contains malformed yaml: %s", configfile, error)
	raise

	data.update(overrides)

	for key, value in data.items():
	if key not in dir(cls):
	raise Exception(f"Unknown config key {key}, known ones are: {dir(self)}")

	expected_type = cls.__annotations__[key]
	try:
	# make sure to cast the strings to they annotated types
	data[key] = expected_type(value)

	except Exception as error:
	raise Exception(f"Bad value for key {key}, got {type(value)} expected {expected_type}.") from error

	return cls(**data)

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