Configure timeout and key for ram.cache

1

Hello, I have one method responsible for generate keys for cache based on the function parameters, like:

def get_cache_key(method, self, *args):
m = hashlib.md5()
m.update(repr(args))
key = m.hexdigest()
return key

And some functions uses ram.cache decorator

@ram.cache(get_cache_key)
def get_courses_by_year(self, year, campus):
...

This works.
I would like to pass key and a timeout value. Is it possible?

Thanks for your time

2

Untested:

from time import time

class get_cache_key(object):
    def __init__(self, seconds):
        self.seconds = seconds
    def __call__(self, method, instance, *args):
          m = hashlib.md5()
          m.update(repr([args + (time() // 300, )))
          return m.hexdigest()

@ram.cache(get_cache_key(3600))
def get_courses_by_year(self, year, campus):
    ...
3

Thanks. With a few modifications in your code I got what I need.

from plone.registry.interfaces import IRegistry
from zope.component import getUtility
import hashlib
from time import time

class propg_cache_key(object):

def __call__(self, method, instance, *args):
    m = hashlib.md5()
    registry = getUtility(IRegistry)
    cache_timeout = registry.get('ufscarpropg.cachetimeout')
    m.update(repr(args + (time() // cache_timeout,)))
    key = m.hexdigest()
    return key