我正在编写用于访问REST API的CLI。我已经在异步初始化方法中定义了aiohttp.ClientSession
类字段_client_session
。
如何正确关闭aiohttp.ClientSession
?如果我这样做:
import asyncio
import aiohttp
class Profile:
def __init__(self, loop):
self._loop = loop
self._client_session = None
def __del__(self):
self._loop.run_until_complete(self._client_session.close())
async def async_init(self):
self._client_session = aiohttp.ClientSession()
@classmethod
async def create(cls, loop):
self = cls(loop)
await self.async_init()
return self
loop = asyncio.get_event_loop()
profile = loop.run_until_complete(Profile.create(loop))
loop.close()
我明白了:
Exception ignored in: <bound method Profile.__del__ of <profile.Profile object at 0x7f8ab82e15c0>>
Traceback (most recent call last):
File "/home/rominf/projects/profile/profile/__init__.py", line 197, in __del__
File "/home/rominf/.pyenv/versions/3.6.6/lib/python3.6/asyncio/base_events.py", line 444, in run_until_complete
File "/home/rominf/.pyenv/versions/3.6.6/lib/python3.6/asyncio/base_events.py", line 358, in _check_closed
RuntimeError: Event loop is closed
sys:1: RuntimeWarning: coroutine 'ClientSession.close' was never awaited
Unclosed client session
client_session: <aiohttp.client.ClientSession object at 0x7f8ab43bf588>
Unclosed connector
connections: ['[(<aiohttp.client_proto.ResponseHandler object at 0x7f8ab28a06a8>, 11519.944147989)]']
connector: <aiohttp.connector.TCPConnector object at 0x7f8ab43bf3c8>
我了解发生这种情况是有原因的:在垃圾收集器删除loop
之前,我先关闭profile
。解决方案是使用del
手动将其删除,但我不想这样做。
是否有一种方法可以在事件循环关闭之前为将来注册执行代码?
答案 0 :(得分:2)
asyncio
在析构函数中不支持IO。
构造函数和属性相同。
推荐的方法是添加async with Profile
或await profile.close()
支持。