使用asyncio正常关闭，内部任务未取消

最新推荐文章于 2022-03-27 18:28:15 发布

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最新推荐文章于 2022-03-27 18:28:15 发布

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分类专栏：后端文章标签：使用asyncio正常关闭，内部任务未取消

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本文详细探讨了在使用Telethon库时遇到的异步任务被销毁但仍在等待的问题，具体表现为在断开与Telegram服务器连接时，未正确取消_recv_loop、_ping_loop和_state_loop等异步循环任务，导致错误信息提示。文章提供了Python3.6.4和Telethon-aio0.18.3版本下解决问题的方法，通过在断开连接函数中明确取消这些任务来避免错误。

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ERROR:asyncio:Task was destroyed but it is pending!
task: <Task pending coro=<TelegramBareClient._recv_loop_impl() running at /usr/lib/python3.6/site-packages/telethon/telegram_bare_client.py:630> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7ff0702814f8>()]>>
ERROR:asyncio:Task was destroyed but it is pending!
task: <Task pending coro=<TelegramBareClient._ping_loop_impl() running at /usr/lib/python3.6/site-packages/telethon/telegram_bare_client.py:593> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7ff0702816d8>()]>>
ERROR:asyncio:Task was destroyed but it is pending!
task: <Task pending coro=<TelegramBareClient._state_loop_impl() running at /usr/lib/python3.6/site-packages/telethon/telegram_bare_client.py:598> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7ff070281138>()]>>
解决方式 Versions: Python 3.6.4, Telethon-aio 0.18.3
def disconnect(self):
    """Disconnects from the Telegram server"""
    ...
    if self._recv_loop:
        self._recv_loop.cancel()
    if self._ping_loop:
        self._ping_loop.cancel()
    if self._state_loop:
        self._state_loop.cancel()
        这些任务都存储在TelegramBareClient实例作为_recv_loop，_ping_loop并_state_loop在启动过程中，但不取消断开连接。