如何在Python中调试卡住的异步协程？

Question

在我的产品代码中有很多协程，它们在处理请求时被卡在未知的位置。我使用Python support extension将gdb附加到进程，但它没有显示进程停滞的协程中的确切行，只显示了主堆栈跟踪。下面是一个最小的例子：

import asyncio

async def hello():
    await asyncio.sleep(30)
    print('hello world')

asyncio.run(hello())

(gdb) py-bt
Traceback (most recent call first):
  File "/usr/lib/python3.8/selectors.py", line 468, in select
    fd_event_list = self._selector.poll(timeout, max_ev)
  File "/usr/lib/python3.8/asyncio/base_events.py", line 2335, in _run_once
  File "/usr/lib/python3.8/asyncio/base_events.py", line 826, in run_forever
    None, getaddr_func, host, port, family, type, proto, flags)
  File "/usr/lib/python3.8/asyncio/base_events.py", line 603, in run_until_complete
    self.run_forever()
  File "/usr/lib/python3.8/asyncio/runners.py", line 299, in run
  File "main.py", line 7, in <module>

GDB显示了一个在第7行结束的跟踪，但代码显然卡在了第4行。如何使用嵌套协程来显示更完整的跟踪？

Answer 1

您可以使用aiodebug.log_slow_callbacks.enable(0.05)

更多信息请关注：https://pypi.org/project/aiodebug/