50 lines
1.4 KiB
Python
50 lines
1.4 KiB
Python
from typing import TypeVar, Type, Callable, Dict, Any
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Attrs = Dict[str, Any]
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C = TypeVar('C')
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# todo not sure about it, could be overthinking...
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# but short enough to change later
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# TODO document why it's necessary?
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def make_config(cls: Type[C], migration: Callable[[Attrs], Attrs]=lambda x: x) -> C:
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user_config = cls.__base__
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old_props = {
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# NOTE: deliberately use gettatr to 'force' lcass properties here
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k: getattr(user_config, k) for k in vars(user_config)
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}
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new_props = migration(old_props)
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from dataclasses import fields
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params = {
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k: v
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for k, v in new_props.items()
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if k in {f.name for f in fields(cls)}
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}
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# todo maybe return type here?
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return cls(**params) # type: ignore[call-arg]
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F = TypeVar('F')
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from contextlib import contextmanager
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import inspect
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from typing import Iterator
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@contextmanager
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def override_config(config: F) -> Iterator[F]:
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'''
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Temporary override for config's parameters, useful for testing/fake data/etc.
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'''
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orig_properties = {k: v for k, v in vars(config).items() if not k.startswith('__')}
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try:
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yield config
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finally:
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# ugh. __dict__ of type objects isn't writable..
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for k, v in orig_properties.items():
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setattr(config, k, v)
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# helper for tests? not sure if could be useful elsewhere
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@contextmanager
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def tmp_config():
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import my.config as C
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with override_config(C):
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yield C # todo not sure?
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