46 lines
1.3 KiB
Python
46 lines
1.3 KiB
Python
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from threading import currentThread
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from django.core.cache.backends.dummy import DummyCache
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from django.core.cache.backends.locmem import LocMemCache
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from django.utils.deprecation import MiddlewareMixin
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_request_cache = {}
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class RequestCache(LocMemCache):
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""" LocMemCache is a threadsafe local memory cache """
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def __init__(self):
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name = 'locmemcache@%i' % hash(currentThread())
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super(RequestCache, self).__init__(name, {})
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def get_request_cache():
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"""
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Returns per-request cache when running RequestCacheMiddleware otherwise a
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DummyCache instance (when running periodic tasks, tests or shell)
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"""
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try:
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return _request_cache[currentThread()]
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except KeyError:
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return DummyCache('dummy', {})
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class RequestCacheMiddleware(MiddlewareMixin):
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def process_request(self, request):
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current_thread = currentThread()
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cache = _request_cache.get(current_thread, RequestCache())
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_request_cache[current_thread] = cache
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cache.clear()
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def clear_cache(self):
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current_thread = currentThread()
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if currentThread() in _request_cache:
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_request_cache[current_thread].clear()
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def process_exception(self, request, exception):
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self.clear_cache()
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def process_response(self, request, response):
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self.clear_cache()
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return response
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