flask - 当 gunicorn 工作人员超时时，是否可以获得堆栈跟踪？

Question

具体来说，我正在使用 gunicorn 中的默认工作人员运行 Flask 应用程序。我试图弄清楚如何调试/跟踪在服务请求时由于超时而杀死工作人员时发生的情况。有没有办法获得堆栈跟踪或分析调试请求？

Answer 1

只是想添加到已接受的答案中，还有另一种方法可以通过使用内置 Python 3 模块 faulthandler 获得类似结果v3.3 中引入 https://docs.python.org/dev/library/faulthandler.html
您可以在 中添加以下两行wsgi.py 在接受的答案中提到:

import faulthandler
faulthandler.enable()

当超时发生时，以下输出将打印到 stderr:

[2020-12-24 13:38:32 +0000] [31304] [INFO] Starting gunicorn 20.0.4
[2020-12-24 13:38:32 +0000] [31304] [INFO] Listening at: http://0.0.0.0:8888 (31304)
[2020-12-24 13:38:32 +0000] [31304] [INFO] Using worker: sync
[2020-12-24 13:38:32 +0000] [31307] [INFO] Booting worker with pid: 31307
[2020-12-24 13:38:55 +0000] [31304] [CRITICAL] WORKER TIMEOUT (pid:31307)
Fatal Python error: Aborted

Current thread 0x00007f411d781700 (most recent call first):
  File "/tmp/app.py", line 14 in c
  File "/tmp/app.py", line 9 in b
  File "/tmp/app.py", line 6 in a
  File "/tmp/app.py", line 20 in catch_all
  File "/tmp/venv/lib/python3.5/site-packages/flask/app.py", line 1936 in dispatch_request
  File "/tmp/venv/lib/python3.5/site-packages/flask/app.py", line 1950 in full_dispatch_request
  File "/tmp/venv/lib/python3.5/site-packages/flask/app.py", line 2447 in wsgi_app
  File "/tmp/venv/lib/python3.5/site-packages/flask/app.py", line 2464 in __call__
  File "/tmp/venv/lib/python3.5/site-packages/gunicorn/workers/sync.py", line 175 in handle_request
  File "/tmp/venv/lib/python3.5/site-packages/gunicorn/workers/sync.py", line 134 in handle
  File "/tmp/venv/lib/python3.5/site-packages/gunicorn/workers/sync.py", line 29 in accept
  File "/tmp/venv/lib/python3.5/site-packages/gunicorn/workers/sync.py", line 67 in run_for_one
  File "/tmp/venv/lib/python3.5/site-packages/gunicorn/workers/sync.py", line 123 in run
  File "/tmp/venv/lib/python3.5/site-packages/gunicorn/workers/base.py", line 140 in init_process
  File "/tmp/venv/lib/python3.5/site-packages/gunicorn/arbiter.py", line 583 in spawn_worker
  File "/tmp/venv/lib/python3.5/site-packages/gunicorn/arbiter.py", line 616 in spawn_workers
  File "/tmp/venv/lib/python3.5/site-packages/gunicorn/arbiter.py", line 545 in manage_workers
  File "/tmp/venv/lib/python3.5/site-packages/gunicorn/arbiter.py", line 202 in run
  File "/tmp/venv/lib/python3.5/site-packages/gunicorn/app/base.py", line 72 in run
  File "/tmp/venv/lib/python3.5/site-packages/gunicorn/app/base.py", line 228 in run
  File "/tmp/venv/lib/python3.5/site-packages/gunicorn/app/wsgiapp.py", line 58 in run
  File "/tmp/venv/bin/gunicorn", line 8 in <module>
[2020-12-24 13:38:55 +0000] [31307] [INFO] Worker exiting (pid: 31307)
[2020-12-24 13:38:55 +0000] [31503] [INFO] Booting worker with pid: 31503