cache.py
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import hashlib
import pickle
from threading import currentThread
from django.core.cache import cache
from django.core.cache.backends.base import DEFAULT_TIMEOUT
from django.core.cache.backends.locmem import LocMemCache
from django.utils import translation
from floraconcierge.errors import MiddlewareError
_request_cache = {}
_installed_middleware = False
def get_request_cache():
try:
return _request_cache[currentThread()]
except KeyError:
raise MiddlewareError('floraconcierge.middleware.RequestCacheMiddleware not loaded')
def new_request_cache(cachecls):
_request_cache[currentThread()] = cache = cachecls()
return cache
def cached(func=None, timeout=DEFAULT_TIMEOUT, *args, **kwargs):
def _make_key(func, args, kwargs):
lang = translation.get_language()
if args and hasattr(args[0], 'get') and hasattr(args[0], 'add'):
data = [lang, func.__name__, args[0].__class__.__name__, pickle.dumps((args[1:], kwargs))]
else:
data = [lang, func.__name__, pickle.dumps((args, kwargs))]
return hashlib.md5("%".join(data)).hexdigest()
def inner(func):
def wrapped(*args, **kwargs):
key = _make_key(func, args, kwargs)
if args and hasattr(args[0], 'get') and hasattr(args[0], 'add'):
obj = args[0]
if key in obj:
return obj.get(key)
else:
result = func(*args, **kwargs)
obj.add(key, result, timeout=timeout)
return result
else:
result = cache.get(key)
if not result:
result = func(*args, **kwargs)
cache.set(key, result, timeout=timeout)
return result
return wrapped
if func is None:
# @cached(...)
return inner
elif callable(func):
# @cached
return inner(func)
else:
raise ValueError('Bad @cached decorator usage')
class RequestCache(LocMemCache):
def __init__(self):
name = 'requestcache@%i' % hash(currentThread())
super(RequestCache, self).__init__(name, {})