def _get_base_conf(self, conf):
try:
base_conf = {}
for key_path in self._base_key_paths:
val = self._get_base_key_val(conf, key_path)
set_nested_key(base_conf, key_path, val)
return base_conf
except KeyError as e:
raise MissingBaseKeyError('Missing value for base key "{base_key}" in order to compute derived key "{derived_key}": {msg}'.format(
derived_key=self.qualname,
base_key=e.args[1],
msg=e.args[0],
)) from e
def _get_default_conf(sig, kwargs_key_map):
"""
Get a default configuration source based on the the default parameter
values.
"""
default_conf = {}
for param, param_desc in sig.parameters.items():
try:
conf_path = kwargs_key_map[param]
except KeyError:
continue
else:
default = param_desc.default
if default is not param_desc.empty:
set_nested_key(default_conf, conf_path, default)
return default_conf