cached.py

# coding=utf-8
from __future__ import absolute_import

import time
from functools import wraps
from django.core.cache import cache


def cached(func=None, ttl=60):
    def decorator(func):
        def _get_key(*args, **kwargs):
            import hashlib
            serialise = []
            for arg in args:
                serialise.append(str(arg))
            for k, v in sorted(kwargs.items()):
                serialise.append(str(k))
                serialise.append(str(v))
            key = hashlib.md5('-|-'.join(serialise)).hexdigest()
            return 'cached_%s_%s' % (func.__name__, key)

        def _set(key, value):
            cache.set(key, (value, time.time()), ttl)

        @wraps(func)
        def wrapper(*args, **kwargs):
            key = _get_key(*args, **kwargs)
            value = func(*args, **kwargs)
            _set(key, value)
            return value

        def cached(*args, **kwargs):
            key = _get_key(*args, **kwargs)
            value = cache.get(key)
            if value is None:
                value = func(*args, **kwargs)
                _set(key, value)
            else:
                value = value[0]
            return value

        def cached_time(*args, **kwargs):
            key = _get_key(*args, **kwargs)
            value = cache.get(key)
            if value:
                return cache.get(key)[1]

        wrapper.cached = cached
        wrapper.cached_time = cached_time
        return wrapper

    if func:
        return decorator(func=func)

    return decorator

example.py

@cached(ttl=60 * 15)
def some_func(a):
    pass

  
some_func.cached(a=1)