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import os
from ..config import Configuration
from ..setting import ListSetting
from ..util import csv_to_list
from .base import Source
__all__ = (
'EnvironmentVariableSource',
)
class EnvironmentVariableSource(Source):
def __init__(self, prefix=None):
super(EnvironmentVariableSource, self).__init__()
self.prefix = prefix
def get_config(self, settings, manager=None, parent=None):
if manager and not self.prefix:
self.prefix = manager.name
for setting in settings:
self.get_setting(setting)
return Configuration(settings=settings, parent=parent)
def get_setting(self, setting):
name = setting.name
if self.prefix:
name = '%s_%s' % (self.prefix, name)
name = name.upper()
if name in os.environ:
if isinstance(setting, ListSetting):
setting.value = csv_to_list(os.environ[name])
else:
setting.value = os.environ[name]