Question

我正在尝试创建Django中间件，该中间件记录有关从视图中引发的异常的特定信息。我无法获得引发异常的行号。

具体来说，追溯的结尾显示File "<string>", line None。这个"<string>"来自哪里，为什么它显示行号None？无论我通过测试还是通过浏览器窗口导航到/view_raises_exception/，我都会得到相同的结果。我确信我可以通过我的process_exception()方法挖掘追溯来获取行号，但我想知道为什么exception.lineno没有给我我期望的结果。

我的设置：

Ubuntu 14.04.3 LTS（Cloud9）
Python 3.4.3
Django 1.9

查看：

def exception_view(request):
    raise SyntaxError('Custom error message...')

的url：

from django.conf.urls import url

from . import views

urlpatterns = [
    url(r'^view_raises_exception/', views.exception_view),
    url(r'^view_raises_no_exceptions/', views.no_exception_view),
]

中间件文件：

from django.http import HttpResponse

class ExceptionLoggingMiddleware(object):
    def process_exception(self, request, exception):
        name = type(exception).__name__
        message = str(exception)
        line_no = exception.lineno
        print('***INSIDE PROCESS_EXCEPTIONS***')
        print('Name:', name)
        print('Message:', message)
        print('Line Number:', line_no)
        # return HttpResponse('Exception handled.')

服务器日志：

System check identified no issues (0 silenced).
September 09, 2016 - 22:58:40
Django version 1.9, using settings 'middlewares_library.settings'
Starting development server at http://0.0.0.0:8080/
Quit the server with CONTROL-C.
***INSIDE PROCESS_EXCEPTIONS***
Name: SyntaxError
Message: Custom error message...
Line Number: None
Internal Server Error: /view_raises_exception/
Traceback (most recent call last):
  File "/home/ubuntu/.virtualenvs/env3/lib/python3.4/site-packages/django/core/handlers/base.py", line 149, in get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/ubuntu/.virtualenvs/env3/lib/python3.4/site-packages/django/core/handlers/base.py", line 147, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/ubuntu/workspace/middlewares_library/library/views.py", line 6, in exception_view
    raise SyntaxError('Custom error message...')
  File "<string>", line None
SyntaxError: Custom error message...
[09/Sep/2016 22:58:43] "GET /view_raises_exception/ HTTP/1.1" 500 68472

提前致谢！

通过中间件

0 个答案: