python - 如何避免 selenium webdriver 的套接字超时？

Question

我有一个复杂的 python-selenium 测试套件来测试非公开网页。在该设置中，我需要像下面这样获取网络驱动程序:

self.driver = webdriver.Firefox(firefox_profile = profile, log_path = logfile)

带有一些配置文件和日志路径。在大多数情况下，这行代码工作正常，但有时(5% 或这种情况)我会收到套接字超时错误:

File "/root/tests/usecase_tests/tools/basicsuite.py", line 213, in set_driver_firefox
    self.driver = webdriver.Firefox(firefox_profile = profile, log_path = logfile)
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/firefox/webdriver.py", line 158, in __init__
    keep_alive=True)
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 154, in __init__
    self.start_session(desired_capabilities, browser_profile)
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 243, in start_session
    response = self.execute(Command.NEW_SESSION, parameters)
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 309, in execute
    response = self.command_executor.execute(driver_command, params)
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/remote_connection.py", line 460, in execute
    return self._request(command_info[0], url, body=data)
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/remote_connection.py", line 484, in _request
    resp = self._conn.getresponse()
  File "/usr/lib/python2.7/httplib.py", line 1136, in getresponse
    response.begin()
  File "/usr/lib/python2.7/httplib.py", line 453, in begin
    version, status, reason = self._read_status()
  File "/usr/lib/python2.7/httplib.py", line 409, in _read_status
    line = self.fp.readline(_MAXLINE + 1)
  File "/usr/lib/python2.7/socket.py", line 480, in readline
    data = self._sock.recv(self._rbufsize)
timeout: timed out

此错误的可能原因是什么？如何调试这个错误？如何解决？

Answer 1

错误说明了一切:

  File "/usr/lib/python2.7/socket.py", line 480, in readline
    data = self._sock.recv(self._rbufsize)
timeout: timed out

事件顺序

这是发生的事件顺序:

• 最初错误发生在 basicsuite.py 中的以下行文件:

  self.driver = webdriver.Firefox(firefox_profile = profile, log_path = logfile)
  

• 经过一系列检查，最终调用了以下方法，但失败了:

  def readinto(self, b):
  """Read up to len(b) bytes into the writable buffer *b* and return
  the number of bytes read.  If the socket is non-blocking and no bytes
  are available, None is returned.
  
  If *b* is non-empty, a 0 return value indicates that the connection
  was shutdown at the other end.
  """
  self._checkClosed()
  self._checkReadable()
  if self._timeout_occurred:
      raise OSError("cannot read from timed out object")
  while True:
      try:
      return self._sock.recv_into(b)
      except timeout:
      self._timeout_occurred = True
      raise
      except error as e:
      if e.args[0] in _blocking_errnos:
          return None
      raise
  

• 程序错误出现在:

  self._sock.recv(b) # where If *b* is non-empty, a 0 return value indicates that the connection was shutdown at the other end.
  

结论

结论是建立连接的尝试没有成功，这意味着 webdriver 的初始化实例并进一步生成新的 Mozilla Firefox浏览器 session 不成功。

分析

不可能得出 timeout: timed out 的真正原因。 发生。但您可以遵循以下一些最佳实践:

• 提供日志文件的完整名称以及 logical location 日志文件(来自项目级别)如下:

  self.driver = webdriver.Firefox(firefox_profile=profile, log_path='./Log/geckodriver.log')
  

• 始终使用 quit() 在 tearDown() 方法中，以便 webdriver 和 webclient 两者均已妥善销毁。

• 在开始您的 Test Execution 之前, 通过 Task Manager确保没有悬挂实例 GeckoDriver 或 Firefox 在您的系统中处理。

• 确保您使用的二进制版本 JDK , Selenium , GeckoDriver , Mozilla Firefox Browser 兼容。您可以在此 QA Selenium WebDriver 3.4.0 + geckodriver 0.18.0 + Firefox ?? - which combination works? 中找到详细讨论

• 清理 Project Workspace在执行 Test Suite 之前和之后从您的 IDE .

• 使用 CCleaner 工具定期清除 操作系统杂务。

• 如果基本版本Firefox Browser太古老了，卸载Firefox Browser通过 Revo Uninstaller 与 Moderate Scan并安装最近的 GA-Released Firefox Browser 的版本.