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# Copyright (c) 2016 Weitian LI <liweitianux@live.com>
# MIT license
"""
Custom validations for the configurations.
"""
from ..errors import ConfigError
def _check_missing(configs, keys):
"""Check whether the mandatory config is provided by the user."""
if isinstance(keys, str):
keys = [keys, ]
for key in keys:
if not configs.getn(key):
raise ConfigError('config "%s" missing' % key)
return True
def check_common(configs):
"""Check the "[common]" section of the configurations."""
_check_missing(configs, "common/data_dir")
return True
def check_frequency(configs):
"""Check the "[frequency]" section of the configurations."""
if configs.getn("frequency/type") == "custom":
_check_missing(configs, "frequency/frequencies")
elif configs.getn("frequency/type") == "calc":
_check_missing(configs, ["frequency/start",
"frequency/stop",
"frequency/step"])
return True
def check_output(configs):
"""Check the "[output]" section of the configurations."""
if configs.getn("output/combine"):
_check_missing(configs, "output/output_dir")
return True
def check_galactic_synchrotron(configs):
"""Check the "[galactic][synchrotron]" section of the configurations."""
_check_missing(configs, ["galactic/synchrotron/template",
"galactic/synchrotron/template_freq",
"galactic/synchrotron/template_unit",
"galactic/synchrotron/indexmap"])
if configs.getn("galactic/synchrotron/save"):
_check_missing(configs, "galactic/synchrotron/output_dir")
return True
# Available checkers to validate the configurations
_CHECKERS = [
check_common,
check_frequency,
check_output,
check_galactic_synchrotron,
]
def validate_configs(configs, checkers=_CHECKERS):
"""Validate the configurations through the supplied checkers.
These checker usually validate on the global scale, and validate
some specific configs against their contexts.
Parameters
----------
configs : `ConfigManager` object
An `ConfigManager` object contains both default and user
configurations.
checkers : list of functions
List of checker functions through which the configurations
will be validated.
Returns
-------
bool
True if the configurations pass all checker functions, otherwise,
the `ConfigError` will be raised with corresponding message.
Raises
------
ConfigError
If any configuration failed the check, a `ConfigError` with
details will be raised.
"""
for checker in checkers:
checker(configs)
return True
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