首页 > 解决方案 > pypi cproto(chrome调试客户端)在退出时挂起

问题描述

使用https://pypi.org/project/cproto/,附加到在 Docker 容器中无头运行的 Chrome 上,我发现它有时会卡住(下面引用的示例不可靠 - 您可能需要运行它几次):

$ python3
Python 3.6.8 (default, Jan 14 2019, 11:02:34) 
[GCC 8.0.1 20180414 (experimental) [trunk revision 259383]] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cproto
>>> cp = cproto.CProto()   # localhost:9222 == my Chrome container
>>> cp.close()
>>> exit()
^CException ignored in: <module 'threading' from '/usr/lib/python3.6/threading.py'>
Traceback (most recent call last):
  File "/usr/lib/python3.6/threading.py", line 1294, in _shutdown
    t.join()
  File "/usr/lib/python3.6/threading.py", line 1056, in join
    self._wait_for_tstate_lock()
  File "/usr/lib/python3.6/threading.py", line 1072, in _wait_for_tstate_lock
    elif lock.acquire(block, timeout):
KeyboardInterrupt
$

这也发生在 Chrome 正常运行时,带有一个 UI,在 Docker 之外。

不管 Chrome 可能会处理什么讨厌的事情,cproto 库应该像这样陷入困境似乎有点“离题”。

有没有办法强制退出cproto? (我在上面做错了什么,还是这是一个错误?)

标签: pythonpython-3.xgoogle-chrome-devtoolschrome-debugging

解决方案


看起来一些非守护线程在主线程退出后仍在运行。这项工作对我有用(尚未找到根本原因,需要更多调查):

diff -ur cproto.orig/core/websocket.py cproto/core/websocket.py
--- cproto.orig/core/websocket.py       2021-01-04 01:24:53.000000000 +0000
+++ cproto/core/websocket.py    2021-03-10 04:10:32.228436532 +0000
@@ -38,8 +38,16 @@
     def connect(self, *args, **kwargs):
         super(self.__class__, self).connect(*args, **kwargs)
 
-        threading.Thread(target=self._read_messages).start()
-        threading.Thread(target=self._process_events).start()
+        # threading.Thread(target=self._read_messages).start()
+        # threading.Thread(target=self._process_events).start()
+
+        t1 = threading.Thread(target=self._read_messages)
+        t1.setDaemon(True)
+        t1.start()
+
+        t2 = threading.Thread(target=self._process_events)
+        t2.setDaemon(True)
+        t2.start()
 
     def close(self):
         # Terminates blocking `get` call on events processing thread

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