如何在 Python 中调试卡住的 asyncio 协程？

Question

我的生产代码中有很多协程，它们在处理请求时卡在未知位置。我将带有Python 支持扩展的gdb 附加到进程，但它没有显示协程中进程卡住的确切行，只显示主要堆栈跟踪。这是一个最小的例子：

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 显示了在第 7 行结束的跟踪，但代码显然卡在第 4 行。如何使用嵌套协程使其显示更完整的跟踪？

Answer 1

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

关注了解更多： https: //pypi.org/project/aiodebug/