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47 lines
1.3 KiB
Python
47 lines
1.3 KiB
Python
from contextlib import contextmanager
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from contextvars import ContextVar, Token
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from typing import TypeVar
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from utils.single import Singleton
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__all__ = ("ContextManager",)
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T = TypeVar("T")
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_values: dict[str, ContextVar] = {}
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class ContextManager(Singleton):
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_values: dict[str, ContextVar] = {}
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def get_context(self, name: str) -> ContextVar[T]:
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if name in self._values:
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return self._values[name]
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else:
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result = ContextVar(name)
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self._values[name] = result
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return result
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def get_value(self, name: str) -> T:
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return self.get_context(name).get()
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def set_context(self, name: str, value: T) -> Token:
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context: ContextVar[T] = self.get_context(name)
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return context.set(value)
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def reset_context(self, name: str, token: Token) -> None:
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context: ContextVar[T] = self.get_context(name)
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context.reset(token)
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@contextmanager
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def with_context(self, name: str, value: T) -> T:
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context: ContextVar[T] = self.get_context(name)
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token: Token = context.set(value)
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try:
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yield value
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finally:
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context.reset(token)
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def __getitem__(self, item: str) -> ContextVar[T]:
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return self.get_context(item)
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