26 lines
761 B
Python
26 lines
761 B
Python
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."""
|