113 lines
2.7 KiB
Python
113 lines
2.7 KiB
Python
import logging
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import os
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from bonobo.errors import ValidationError
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def to_bool(s):
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if s is None:
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return False
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if type(s) is bool:
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return s
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if len(s):
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if s.lower() in ('f', 'false', 'n', 'no', '0'):
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return False
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return True
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return False
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class Setting:
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__all__ = {}
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@classmethod
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def clear_all(cls):
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for setting in Setting.__all__.values():
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setting.clear()
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def __new__(cls, name, *args, **kwargs):
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Setting.__all__[name] = super().__new__(cls)
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return Setting.__all__[name]
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def __init__(self, name, default=None, validator=None, formatter=None):
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self.name = name
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if default:
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self.default = default if callable(default) else lambda: default
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else:
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self.default = lambda: None
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self.validator = validator
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self.formatter = formatter
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def __repr__(self):
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return '<Setting {}={!r}>'.format(self.name, self.get())
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def __eq__(self, other):
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return self.get() == other
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def set(self, value):
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value = self.formatter(value) if self.formatter else value
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if self.validator and not self.validator(value):
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raise ValidationError('Invalid value {!r} for setting {}.'.format(value, self.name))
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self.value = value
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def set_if_true(self, value):
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"""Sets the value to true if it is actually true. May sound strange but the main usage is enforcing some
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settings from command line."""
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if value:
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self.set(True)
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def get(self):
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try:
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return self.value
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except AttributeError:
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value = os.environ.get(self.name, None)
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if value is None:
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value = self.default()
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self.set(value)
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return self.value
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def clear(self):
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try:
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del self.value
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except AttributeError:
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pass
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# Debug/verbose mode.
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DEBUG = Setting('DEBUG', formatter=to_bool, default=False)
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# Profile mode.
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PROFILE = Setting('PROFILE', formatter=to_bool, default=False)
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# Quiet mode.
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QUIET = Setting('QUIET', formatter=to_bool, default=False)
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# Logging level.
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LOGGING_LEVEL = Setting(
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'LOGGING_LEVEL',
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formatter=logging._checkLevel,
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validator=logging._checkLevel,
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default=lambda: logging.DEBUG if DEBUG.get() else logging.INFO
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)
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# Input/Output format for transformations
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IOFORMAT_ARG0 = 'arg0'
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IOFORMAT_KWARGS = 'kwargs'
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IOFORMATS = {
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IOFORMAT_ARG0,
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IOFORMAT_KWARGS,
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}
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IOFORMAT = Setting('IOFORMAT', default=IOFORMAT_KWARGS, validator=IOFORMATS.__contains__)
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def check():
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if DEBUG.get() and QUIET.get():
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raise RuntimeError('I cannot be verbose and quiet at the same time.')
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clear_all = Setting.clear_all
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