class ResolutionCache:
"""
Local cache of resolutions.
Args:
context: An environment variable could have different meanings in
different contexts. For example,
path: Path to cache. Uses the user's home directory by default.
"""
def __init__(
self,
context: str,
logger: Optional[Logger] = None,
path: Optional[Path] = None,
) -> None:
self.logger = logger or get_logger()
self.context = context
self.path = path or Path.home().absolute().joinpath(".wevcache")
self.resolutions: Dict[Tuple[str, ...], Dict[str, Any]] = {}
self.logger.debug(
'ResolutionCache: context="%s" path="%s"',
self.context,
self.path,
)
def get(self, names: Tuple[str, ...]) -> Optional[Resolution]:
"""
Gets a cached resolution, or `None` if not cached.
"""
if store := self.resolutions.get(names, None):
if values := store.get("values", None):
if isinstance(values, list):
store["values"] = tuple(cast(List[str], values))
return Resolution(store=store)
def resolution(self) -> Optional[Resolution]:
"""
Gets the resolution.
"""
if store := self.store.get("resolution", None):
return Resolution(store=store)