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from abc import ABCMeta, abstractmethod
from types import TracebackType
from typing import Optional, Type, TypeVar
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.
"""
async def __aenter__(self: T) -> T:
return self
async def __aexit__(
self,
exc_type: Optional[Type[BaseException]],
exc_val: Optional[BaseException],
exc_tb: Optional[TracebackType],
) -> None:
await self.aclose()
@abstractmethod
async def aclose(self) -> None:
"""Close the resource."""