[Trac-tickets] [The Trac Project] #3043: Intermittent error due to `environ` being `None` in TracStandalone

[The Trac Project]

#3043: Intermittent  error due to `environ` being `None` in TracStandalone
--------------------+-------------------------------------------------------
 Reporter:  cboos   |       Owner:  jonas
     Type:  defect  |      Status:  new  
 Priority:  normal  |   Milestone:       
Component:  tracd   |     Version:  devel
 Severity:  minor   |    Keywords:  wsgi 
--------------------+-------------------------------------------------------
 This happens from time to times, either when reading or writing to
 `environ`. Here's a backtrace obtained when trying to write into
 `environ`, which happens to be `None`.


 {{{
 localhost - - [16/Apr/2006 12:35:15] "GET
 /devel/chrome/common/trac_banner.png HTTP/1.1" 200 -
 localhost - - [16/Apr/2006 12:35:15] "GET
 /devel/chrome/common/trac_logo_mini.png HTTP/1.1" 200 -
 localhost - - [16/Apr/2006 12:35:15] "GET /devel/chrome/common/dots.gif
 HTTP/1.1" 200 -
 ----------------------------------------
 Exception happened during processing of request from ('127.0.0.1', 1553)
 Traceback (most recent call last):
   File "C:\Program Files\ActiveState\Python-2.4\lib\SocketServer.py", line
 463, in process_request_thread
     self.finish_request(request, client_address)
   File "C:\Program Files\ActiveState\Python-2.4\lib\SocketServer.py", line
 254, in finish_request
     self.RequestHandlerClass(request, client_address, self)
   File "C:\Program Files\ActiveState\Python-2.4\lib\SocketServer.py", line
 521, in __init__
 localhost - - [16/Apr/2006 12:35:15] "GET /devel/chrome/common/trac.ico
 HTTP/1.1" 200 -
     self.handle()
   File "C:\Program Files\ActiveState\Python-2.4\lib\BaseHTTPServer.py",
 line 316, in handle
     self.handle_one_request()
   File "C:\Workspace\install\lib\python\trac\devel\lib\site-
 packages\trac\web\wsgi.py", line 173, in handle_one_request
 localhost - - [16/Apr/2006 12:35:15] "GET
 /devel/chrome/common/topbar_gradient2.png HTTP/1.1" 200 -
     gateway = self.server.gateway(self, environ)
   File "C:\Workspace\install\lib\python\trac\devel\lib\site-
 packages\trac\web\wsgi.py", line 187, in __init__
     _ErrorsWrapper(lambda x: handler.log_error('%s', x)))
   File "C:\Workspace\install\lib\python\trac\devel\lib\site-
 packages\trac\web\wsgi.py", line 69, in __init__
     environ['wsgi.version'] = self.wsgi_version
 TypeError: object does not support item assignment
 ----------------------------------------
 localhost - - [16/Apr/2006 12:35:15] "GET /devel/chrome/common/asc.png
 HTTP/1.1" 200 -
 localhost - - [16/Apr/2006 12:35:15] "GET /devel/chrome/common/folder.png
 HTTP/1.1" 200 -
 localhost - - [16/Apr/2006 12:35:15] "GET /devel/chrome/common/parent.png
 HTTP/1.1" 200 -
 }}}

 This Python 2.4.2, on Windows (but happened also with 2.3.5).

 After some code inspection, it seems that in
 `WSGIRequestHandler.setup_environ`,
 there's this code path:
 {{{
         self.raw_requestline = self.rfile.readline()
         if not self.parse_request(): # An error code has been sent, just
 exit
             self.close_connection = 1
             return
 }}}
 which is certainly the reason for the above error.
 I'm not sure what's going on here, as neither `raw_requestline`,
 nor `close_connection` seems to be used anywhere else...

-- 
Ticket URL: <http://projects.edgewall.com/trac/ticket/3043>
The Trac Project <http://trac.edgewall.com/>