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@perrygeo
Created April 17, 2012 17:03
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cache arbitrary functions in django
from django.core.cache import cache as _djcache
def cache_function(seconds=6000):
"""
Cache the result of a function call for the specified number of seconds,
using Django's caching mechanism.
Assumes that the function never returns None (as the cache returns None to indicate a miss),
and that the function's result only depends on its parameters.
Note that the ordering of parameters is important.
e.g. myFunction(x = 1, y = 2), myFunction(y = 2, x = 1), and myFunction(1,2) will each be cached separately.
Usage:
@cache_function(600)
def myExpensiveMethod(parm1, parm2, parm3):
....
return expensiveResult
"""
def doCache(f):
def x(*args, **kwargs):
key = sha1(str(f.__module__) + str(f.__name__) + str(args) + str(kwargs)).hexdigest()
result = _djcache.get(key)
if result is None:
result = f(*args, **kwargs)
_djcache.set(key, result, seconds)
return result
return x
return doCache
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