time.sleep挂起了

Question

这是一些奇怪的回归，我只能在我们拥有的更强大的生产机器上重现。

def test_foo(self):
    res = self._run_job( ....)
    self.assertTrue("Hello Input!" in res.json()["stdout"], res.text)
    .........

def _run_job(self, cbid, auth, d):    
    .........
    while True:
        res = requests.get(URL+"/status/"+status_id, auth=auth)   <--- hangs here
        if res.json()["status"] != "Running":
            break
        else:
            time.sleep(2)
    ..........

我必须打破这个过程，这是回溯：

Traceback (most recent call last):
  File "test_full.py", line 231, in <module>
    unittest.main()
  File "/opt/graphyte/vens/gcs/local/lib/python2.7/site-packages/unittest2/main.py", line 98, in __init__
    self.runTests()
  File "/opt/graphyte/vens/gcs/local/lib/python2.7/site-packages/unittest2/main.py", line 232, in runTests
    self.result = testRunner.run(self.test)
  File "/opt/graphyte/vens/gcs/local/lib/python2.7/site-packages/unittest2/runner.py", line 162, in run
    test(result)
  File "/opt/graphyte/vens/gcs/local/lib/python2.7/site-packages/unittest2/suite.py", line 64, in __call__
    return self.run(*args, **kwds)
  File "/opt/graphyte/vens/gcs/local/lib/python2.7/site-packages/unittest2/suite.py", line 84, in run
    self._wrapped_run(result)
  File "/opt/graphyte/vens/gcs/local/lib/python2.7/site-packages/unittest2/suite.py", line 114, in _wrapped_run
    test._wrapped_run(result, debug)
  File "/opt/graphyte/vens/gcs/local/lib/python2.7/site-packages/unittest2/suite.py", line 116, in _wrapped_run
    test(result)
  File "/opt/graphyte/vens/gcs/local/lib/python2.7/site-packages/unittest2/case.py", line 398, in __call__
    return self.run(*args, **kwds)
  File "/opt/graphyte/vens/gcs/local/lib/python2.7/site-packages/unittest2/case.py", line 340, in run
    testMethod()
  File "test_full.py", line 59, in test_session
    "cmd": "python helloworld.py"
  File "test_full.py", line 129, in _run_job
    time.sleep(2)
  File "/opt/graphyte/vens/gcs/local/lib/python2.7/site-packages/gevent/hub.py", line 79, in sleep
    switch_result = get_hub().switch()
  File "/opt/graphyte/vens/gcs/local/lib/python2.7/site-packages/gevent/hub.py", line 164, in switch
    return greenlet.switch(self)
KeyboardInterrupt
Exception KeyError: KeyError(155453036,) in <module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored

为什么会涉及到gevent？这是一个功能测试。它只通过requests库发出HTTP请求，所以switch可能引用requests。

但是作为一个简单的循环，这怎么可能失败呢？

Answer 1

你是不是在gevent里给猴子打补丁？

它可能是打开了网络请求，但由于某种原因再也没有回来。我要说的是，现在停止修补猴子，在你需要的地方放入gevent。

可能现在请求是异步的，它立即返回，然后休眠(再次异步)，请求，并清洗/重复...

Answer 2

为什么要涉及gevent？

gevent库为一些标准模块打了补丁，使它们相互协作。其中一个变化就是用gevent.sleep取代time.sleep。

http://www.gevent.org/gevent.monkey.html#gevent.monkey.patch_time