Question

尝试为我们的Django项目运行一些功能测试，但是我们遇到了一个很难调试的错误。我们已尝试设置sauce connect，但我们的构建失败了。

您可以看到构建的results，但这里是堆栈跟踪。

======================================================================
ERROR: test_page_load (quote_me.tests.FunctionalTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/opt/python/3.6.3/lib/python3.6/urllib/request.py", line 1318, in do_open
    encode_chunked=req.has_header('Transfer-encoding'))
  File "/opt/python/3.6.3/lib/python3.6/http/client.py", line 1239, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/opt/python/3.6.3/lib/python3.6/http/client.py", line 1285, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/opt/python/3.6.3/lib/python3.6/http/client.py", line 1234, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/opt/python/3.6.3/lib/python3.6/http/client.py", line 1026, in _send_output
    self.send(msg)
  File "/opt/python/3.6.3/lib/python3.6/http/client.py", line 964, in send
    self.connect()
  File "/opt/python/3.6.3/lib/python3.6/http/client.py", line 1400, in connect
    server_hostname=server_hostname)
  File "/opt/python/3.6.3/lib/python3.6/ssl.py", line 407, in wrap_socket
    _context=self, _session=session)
  File "/opt/python/3.6.3/lib/python3.6/ssl.py", line 814, in __init__
    self.do_handshake()
  File "/opt/python/3.6.3/lib/python3.6/ssl.py", line 1068, in do_handshake
    self._sslobj.do_handshake()
  File "/opt/python/3.6.3/lib/python3.6/ssl.py", line 689, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLEOFError: EOF occurred in violation of protocol (_ssl.c:777)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/travis/build/winecountry/quote-me/quote_me/tests.py", line 77, in setUp
    self.selenium = webdriver.Remote(desired_capabilities=capabilities, command_executor="https://%s/wd/hub" % hub_url)
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/selenium/webdriver/remote/webdriver.py", line 154, in __init__
    self.start_session(desired_capabilities, browser_profile)
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/selenium/webdriver/remote/webdriver.py", line 243, in start_session
    response = self.execute(Command.NEW_SESSION, parameters)
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/selenium/webdriver/remote/webdriver.py", line 310, in execute
    response = self.command_executor.execute(driver_command, params)
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/selenium/webdriver/remote/remote_connection.py", line 466, in execute
    return self._request(command_info[0], url, body=data)
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/selenium/webdriver/remote/remote_connection.py", line 528, in _request
    resp = opener.open(request, timeout=self._timeout)
  File "/opt/python/3.6.3/lib/python3.6/urllib/request.py", line 526, in open
    response = self._open(req, data)
  File "/opt/python/3.6.3/lib/python3.6/urllib/request.py", line 544, in _open
    '_open', req)
  File "/opt/python/3.6.3/lib/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
  File "/opt/python/3.6.3/lib/python3.6/urllib/request.py", line 1361, in https_open
    context=self._context, check_hostname=self._check_hostname)
  File "/opt/python/3.6.3/lib/python3.6/urllib/request.py", line 1320, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error EOF occurred in violation of protocol (_ssl.c:777)>

错误将我指向tests.py文件中的第77行，即

self.selenium = webdriver.Remote(desired_capabilities=capabilities, command_executor="https://%s/wd/hub" % hub_url)

这完全基于code from Travis，您可以看到我们的.travis.yml。

def setUp(self):
    if "TRAVIS" in environ:
        username = environ["SAUCE_USERNAME"]
        access_key = environ["SAUCE_ACCESS_KEY"]
        capabilities = {}
        capabilities["tunnel-identifier"] = environ["TRAVIS_JOB_NUMBER"]
        hub_url = "%s:%s@localhost:4445" % (username, access_key)
        capabilities["build"] = environ["TRAVIS_BUILD_NUMBER"]
        capabilities["tags"] = [environ["TRAVIS_PYTHON_VERSION"], "CI"]
        self.selenium = webdriver.Remote(desired_capabilities=capabilities, command_executor="https://%s/wd/hub" % hub_url)
    else:   
        self.selenium = webdriver.Safari()
        super(FunctionalTestCase, self).setUp()

似乎是SSL证书问题，所以我调查了no_ssl_bump_domains option但似乎没有帮助。还认为某些东西可能不稳定，因为我们使用的是Django manage.py runserver命令。

如果您需要其他信息，请告诉我们，我们非常感谢您的帮助！

Answer 1

通过更改

来解决此问题

self.selenium = webdriver.Remote(desired_capabilities=capabilities, command_executor="https://%s/wd/hub" % hub_url)

到

self.selenium = webdriver.Remote(desired_capabilities=capabilities, command_executor="http://%s/wd/hub" % hub_url)

如果您错过了，我们将command_executor更改为使用http而不是https。

Answer 2

错误确实给了我们一个提示：

File "/opt/python/3.6.3/lib/python3.6/urllib/request.py", line 1318, in do_open
      encode_chunked=req.has_header('Transfer-encoding'))

似乎确实是 encoding 问题。但是当您使用 Travis CI 时，我建议您更改参数的位置，原因如下：

根据文档，selenium.webdriver.remote.webdriver的WebDriver implementation如下：

class selenium.webdriver.remote.webdriver.WebDriver(command_executor='http://127.0.0.1:4444/wd/hub', desired_capabilities=None, browser_profile=None, proxy=None, keep_alive=False, file_detector=None, options=None)

根据你的代码块：

self.selenium = webdriver.Remote(desired_capabilities=capabilities, command_executor="https://%s/wd/hub" % hub_url)

您可能正在尝试：

self.selenium = webdriver.Remote(command_executor="https://%s/wd/hub" % hub_url, desired_capabilities=capabilities)

注意：虽然我们没有接触过desired_capabilities

在使用Sevisium webriver测试的Travis CI中使用Sauce Labs时出现SSL错误（Django项目）

2 个答案: