MyPagePlugin not functioning as default handler (solution included, but raises another error)

[anonymous]

When setting the MyPagePlugin as default handler in Trac

trac.ini

 [trac]
 default_handler = MyPagePlugin

... the page begins to load and nothing happens. I only get following error in the console (using trac as daemon without apache or sth. similar):

 ----------------------------------------
 Exception happened during processing of request from ('127.0.0.1', 2924)
 Traceback (most recent call last):
   File "C:\Python25\lib\SocketServer.py", line 464, in process_request_thread
     self.finish_request(request, client_address)
   File "C:\Python25\lib\SocketServer.py", line 254, in finish_request
     self.RequestHandlerClass(request, client_address, self)
   File "C:\Python25\lib\SocketServer.py", line 522, in __init__
     self.handle()
   File "C:\Python25\lib\BaseHTTPServer.py", line 316, in handle
     self.handle_one_request()
   File "C:\Python25\lib\site-packages\trac-0.11.4rc1-py2.5-win32.egg\trac\web\wsgi.py", line 175, in handle_one_request
     gateway.run(self.server.application)
   File "C:\Python25\lib\site-packages\trac-0.11.4rc1-py2.5-win32.egg\trac\web\wsgi.py", line 98, in run
     self._write('')
   File "C:\Python25\lib\site-packages\trac-0.11.4rc1-py2.5-win32.egg\trac\web\wsgi.py", line 192, in _write
     assert self.headers_set, 'Response not started'
 AssertionError: Response not started
 ----------------------------------------

I didn't have any clue about python before today, but I could fix this problem by determining the default handler within the function/method process_request(self, req) of the MyPagePlugin.py file like following (+ means added; # means changed):

 36	def process_request(self, req):
 37		url = self.mypage_url(req)
 ++		if self.config.get('trac', 'default_handler') == 'MyPagePlugin':
 ++			replacement_urls = ['/me', '/']
 ++		else:
 ++			replacement_urls = ['/']
 38		self.log.debug('process_request: %s' % url)
 ##		if req.path_info in replacement_urls:
 40			req.send_response(307)
 41			req.send_header('Location', url)
 42			req.end_headers()
 43			return

But now I have another problem...

Our Trac is configured to redirect the user to the login page if the permission is insufficient. In words: all anonymous access is forbidden, only authenticated users can do anything. PermRedirectPlugin is used for this.

Because of the fix I made the following page is coming up when there is no authentication cookie and the site is called:

Oops…

Trac detected an internal error:
TypeError: issubclass() arg 1 must be a class

There was an internal error in Trac. It is recommended that you inform your local >Trac administrator and give him all the information he needs to reproduce the issue.

The action that triggered the error was:

GET: /

---

Because I'm bloody new to Python, at this point I am at my wits' end.

The tracd server daemon is running on Windows XP Professional SP2 if that helps.

[Steffen Hoffmann]

Replying to anonymous:

When setting the MyPagePlugin as default handler in Trac ![...]

Why would you/someone do that? Plugins is simply not intended as a default handler for Trac. Simply don't expect it to do so, but use as documented. You may still need to apply a patch before #4887 is resolved, to get expected results.

I suggest to close this ticket as invalid/wontfix/worksforme.