79 lines
2.3 KiB
Python
79 lines
2.3 KiB
Python
import io
|
|
|
|
import ruamel.yaml
|
|
|
|
|
|
def set_values(config, keys, value):
|
|
'''
|
|
Given a hierarchy of configuration dicts, a sequence of parsed key strings, and a string value,
|
|
descend into the hierarchy based on the keys to set the value into the right place.
|
|
'''
|
|
if not keys:
|
|
return
|
|
|
|
first_key = keys[0]
|
|
if len(keys) == 1:
|
|
config[first_key] = value
|
|
return
|
|
|
|
if first_key not in config:
|
|
config[first_key] = {}
|
|
|
|
set_values(config[first_key], keys[1:], value)
|
|
|
|
|
|
def convert_value_type(value):
|
|
'''
|
|
Given a string value, determine its logical type (string, boolean, integer, etc.), and return it
|
|
converted to that type.
|
|
|
|
Raise ruamel.yaml.error.YAMLError if there's a parse issue with the YAML.
|
|
'''
|
|
return ruamel.yaml.YAML(typ='safe').load(io.StringIO(value))
|
|
|
|
|
|
def parse_overrides(raw_overrides):
|
|
'''
|
|
Given a sequence of configuration file override strings in the form of "section.option=value",
|
|
parse and return a sequence of tuples (keys, values), where keys is a sequence of strings. For
|
|
instance, given the following raw overrides:
|
|
|
|
['section.my_option=value1', 'section.other_option=value2']
|
|
|
|
... return this:
|
|
|
|
(
|
|
(('section', 'my_option'), 'value1'),
|
|
(('section', 'other_option'), 'value2'),
|
|
)
|
|
|
|
Raise ValueError if an override can't be parsed.
|
|
'''
|
|
if not raw_overrides:
|
|
return ()
|
|
|
|
parsed_overrides = []
|
|
|
|
for raw_override in raw_overrides:
|
|
try:
|
|
raw_keys, value = raw_override.split('=', 1)
|
|
parsed_overrides.append((tuple(raw_keys.split('.')), convert_value_type(value),))
|
|
except ValueError:
|
|
raise ValueError(
|
|
f"Invalid override '{raw_override}'. Make sure you use the form: SECTION.OPTION=VALUE"
|
|
)
|
|
except ruamel.yaml.error.YAMLError as error:
|
|
raise ValueError(f"Invalid override '{raw_override}': {error.problem}")
|
|
|
|
return tuple(parsed_overrides)
|
|
|
|
|
|
def apply_overrides(config, raw_overrides):
|
|
'''
|
|
Given a configuration dict and a sequence of configuration file override strings in the form of
|
|
"section.option=value", parse each override and set it the configuration dict.
|
|
'''
|
|
overrides = parse_overrides(raw_overrides)
|
|
|
|
for (keys, value) in overrides:
|
|
set_values(config, keys, value)
|