| from __future__ import annotations | |
| import sys | |
| from abc import ABCMeta, abstractmethod | |
| from types import TracebackType | |
| from typing import TypeVar | |
| if sys.version_info >= (3, 11): | |
| from typing import Self | |
| else: | |
| from typing_extensions import Self | |
| T = TypeVar("T") | |
| class AsyncResource(metaclass=ABCMeta): | |
| """ | |
| Abstract base class for all closeable asynchronous resources. | |
| Works as an asynchronous context manager which returns the instance itself on enter, | |
| and calls :meth:`aclose` on exit. | |
| """ | |
| __slots__ = () | |
| async def __aenter__(self) -> Self: | |
| return self | |
| async def __aexit__( | |
| self, | |
| exc_type: type[BaseException] | None, | |
| exc_val: BaseException | None, | |
| exc_tb: TracebackType | None, | |
| ) -> None: | |
| await self.aclose() | |
| async def aclose(self) -> None: | |
| """Close the resource.""" | |