[patch] file cache blows up time to time

[eugene@…]

I am getting weird errors ~once a week:

Traceback (most recent call last):

 File "/home/elazutkin/djsrc/django/core/handlers/base.py", line 74, in get_response
   response = callback(request, *callback_args, **callback_kwargs)

 File "/home/elazutkin/djsrc/django/utils/decorators.py", line 12, in _wrapped_view
   result = middleware.process_request(request)

 File "/home/elazutkin/djsrc/django/middleware/cache.py", line 40, in process_request
   cache_key = get_cache_key(request, self.key_prefix)

 File "/home/elazutkin/djsrc/django/utils/cache.py", line 125, in get_cache_key
   headerlist = cache.get(cache_key, None)

 File "/home/elazutkin/djsrc/django/core/cache.py", line 299, in get
   exp = pickle.load(f)

EOFError

I have no idea how it happens. Maybe a processing thread dies when connection closes prematurely for whatever reason before it finished writing. I've added EOFError to the long list of allowable exceptions. Sometimes I feel we need to go back to the original implementation and treat all errors during cache retrieval as "no cached data".

[Adrian Holovaty]

(In [1685]) Fixed #1039 -- Changed file-based cache to cache EOFErrors during pickle. Thanks for the patch, Eugene