我的应用依赖于：
它在开发和生产环境中运行完美，但在使用硒进行测试时却没有。
使用weasyprint，我从HTML创建一个PDF，这个库使用urllib来下载CSS（例如http://localhost:8081/static/lib/bootstrap/css/bootstrap.min.css），但是在打开它时它会挂起（没有错误，只是卡住了）。
如果我在挂机时直接在浏览器中输入此网址，则会显示CSS。
使用的命令：
./manage.py test tests.test_account.HomeNewVisitorTest
测试的相关部分：
from selenium import webdriver
class HomeNewVisitorTest(StaticLiveServerTestCase):
def setUp(self):
if TEST_ENV_FIREFOX:
self.driver = webdriver.Firefox()
else:
self.driver = webdriver.PhantomJS()
self.driver.set_window_size(1440, 900)
def tearDown(self):
try:
path = 'worksites/' + self.worksite_name.lower()
os.rmdir(settings.MEDIA_ROOT + path)
except FileNotFoundError:
pass
super().tearDown()
def test(self):
d = self.driver
d.get(self.get_full_url('home'))
d.find_element_by_css_selector('.btn-success[type=submit]').click()
在我看来：
# Generate PDF for contact directory
template = get_template("pdf/annuaire.html")
context = {"worksite": worksite}
html = template.render(RequestContext(self.request, context))
base_url = self.request.build_absolute_uri("/")
pdf = weasyprint.HTML(string=html, base_url=base_url)
pdf.write_pdf(directory + '/annuaire.pdf')
这是卡住时的线程转储：
Fatal Python error: Aborted
Thread 0x0000000106f92000 (most recent call first):
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/socket.py", line 374 in readinto
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/http/client.py", line 313 in _read_status
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/http/client.py", line 351 in begin
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/http/client.py", line 1171 in getresponse
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 1185 in do_open
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 1210 in http_open
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 441 in _call_chain
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 481 in _open
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 463 in open
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 161 in urlopen
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/weasyprint/urls.py", line 276 in default_url_fetcher
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/weasyprint/urls.py", line 311 in fetch
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/contextlib.py", line 59 in __enter__
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/weasyprint/__init__.py", line 297 in _select_source
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/contextlib.py", line 59 in __enter__
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/weasyprint/__init__.py", line 223 in __init__
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/weasyprint/css/__init__.py", line 198 in find_stylesheets
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/weasyprint/css/__init__.py", line 448 in get_all_computed_styles
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/weasyprint/document.py", line 312 in _render
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/weasyprint/__init__.py", line 132 in render
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/weasyprint/__init__.py", line 164 in write_pdf
File "/Users/sebcorbin/Sites/planexo/worksite/views.py", line 111 in done
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/formtools/wizard/views.py", line 357 in render_done
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/formtools/wizard/views.py", line 730 in render_done
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/formtools/wizard/views.py", line 300 in post
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/formtools/wizard/views.py", line 686 in post
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/views/generic/base.py", line 89 in dispatch
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/formtools/wizard/views.py", line 237 in dispatch
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/views/generic/base.py", line 71 in view
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/contrib/auth/decorators.py", line 22 in _wrapped_view
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/core/handlers/base.py", line 132 in get_response
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/core/handlers/wsgi.py", line 189 in __call__
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/test/testcases.py", line 1099 in __call__
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/contrib/staticfiles/handlers.py", line 63 in __call__
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/wsgiref/handlers.py", line 137 in run
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/core/servers/basehttp.py", line 182 in handle
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/socketserver.py", line 673 in __init__
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/core/servers/basehttp.py", line 102 in __init__
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/socketserver.py", line 344 in finish_request
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/socketserver.py", line 331 in process_request
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/socketserver.py", line 305 in _handle_request_noblock
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/socketserver.py", line 238 in serve_forever
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/test/testcases.py", line 1182 in run
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/threading.py", line 920 in _bootstrap_inner
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/threading.py", line 888 in _bootstrap
Current thread 0x00007fff7996a300 (most recent call first):
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/socket.py", line 374 in readinto
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/http/client.py", line 313 in _read_status
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/http/client.py", line 351 in begin
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/http/client.py", line 1171 in getresponse
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 1185 in do_open
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 1210 in http_open
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 441 in _call_chain
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 481 in _open
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 463 in open
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/selenium/webdriver/remote/remote_connection.py", line 457 in _request
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/selenium/webdriver/remote/remote_connection.py", line 389 in execute
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/selenium/webdriver/remote/webdriver.py", line 191 in execute
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/selenium/webdriver/remote/webelement.py", line 447 in _execute
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/selenium/webdriver/remote/webelement.py", line 68 in click
File "/Users/sebcorbin/Sites/planexo/tests/test_account.py", line 203 in _test_worksite_form
File "/Users/sebcorbin/Sites/planexo/tests/test_account.py", line 36 in test
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/unittest/case.py", line 577 in run
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/unittest/case.py", line 625 in __call__
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/test/testcases.py", line 186 in __call__
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/unittest/suite.py", line 122 in run
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/unittest/suite.py", line 84 in __call__
File "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/unittest/runner.py", line 168 in run
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/test/runner.py", line 178 in run_suite
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/test/runner.py", line 211 in run_tests
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/core/management/commands/test.py", line 90 in handle
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/core/management/base.py", line 441 in execute
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/core/management/commands/test.py", line 74 in execute
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/core/management/base.py", line 390 in run_from_argv
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/core/management/commands/test.py", line 30 in run_from_argv
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/core/management/__init__.py", line 330 in execute
File "/Users/sebcorbin/.virtualenvs/planexo-py3/lib/python3.4/site-packages/django/core/management/__init__.py", line 338 in execute_from_command_line
File "./manage.py", line 10 in <module>
答案 0 :(得分：5)
感谢大家指出问题所在，我为本文http://nedbatchelder.com/blog/201103/quick_and_dirty_multithreaded_django_dev_server.html提供了灵感，并修改了我的manage.py文件：
#!/usr/bin/env python
from http import server
import os
from socketserver import ThreadingMixIn
import sys
def monkey_patch_test_server():
# This monkey-patches HTTPServer to create a base HTTPServer class that
# supports multithreading
originalhttpserver = server.HTTPServer
class ThreadedHTTPServer(ThreadingMixIn, originalhttpserver):
def __init__(self, server_address, RequestHandlerClass=None):
originalhttpserver.__init__(self, server_address,
RequestHandlerClass)
server.HTTPServer = ThreadedHTTPServer
if __name__ == "__main__":
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "planexo.settings")
from django.core.management import execute_from_command_line
if sys.argv[1] == 'test':
monkey_patch_test_server()
execute_from_command_line(sys.argv)
现在有效！
答案 1 :(得分：1)
使用Python faulthandler模块打印所有挂起线程的回溯。这将确定你发生悬挂的实际功能。
如果需要，请编辑您的问题并添加相关信息。
否则我的猜测是你正在使用Django测试/开发服务器，它一次只能处理一个请求。您对dev服务器的初始HTTP请求会触发请求从其自身请求数据的请求，Django dev服务器无法执行此操作。但这只是猜测。
此问题中也缺少相关的源代码。
答案 2 :(得分：1)
我会分享我的案子：
我的Django硒测试（django == 1.7.12和selenium == 2.53.1）与ChromeDriver 2.21.371459和谷歌浏览器48.0.2564.116有关。
我能够隔离这个问题。在我的情况下，它仅发生在我的自定义本地cdn域上引用静态文件（例如<img>标记中的图像，例如http://cdn.local.myproject.net/static/myimage.png）的页面。如果我使用相对路径“/static/myimage.png”或localhost“http://127.0.0.1/static/myimage.png”，则问题不存在，因此我认为这是DNS问题。
我可以使用chrome的--dns-prefetch-disable选项来绕过这个问题。
Python中的示例：
from selenium.webdriver import Chrome
from selenium.webdriver.chrome.options import Options
chrome_options = Options()
chrome_options.add_argument('--dns-prefetch-disable')
driver = Chrome(chrome_options=options)
我不知道这是否是一般情况，但希望它可以帮助你们中的一些人。
答案 3 :(得分：0)
使用new Uri(databaseFileURI).LocalPath模块。也许它也可以是Django，只能接受1个请求。