helper functions to get/set file dependant cache data

[Nebojša Đorđević - nesh <nesh@…>]

from django.core.cache import cache
import sha, os

FILE_CACHE_TIMEOUT = 60 * 60 * 60 * 24 * 31 # 1 month
FILE_CACHE_FMT = '%(name)s_%(hash)s'

def set_cached_file(path, value):
    """ Store file dependent data in cache.
        Timeout is set to FILE_CACHE_TIMEOUT (1month).
        
        Key is created from base name of file and SHA1 digest of the path.
    """
    
    mtime = os.path.getmtime(path)
    sh = sha.new()
    sh.update(path)
    hash = sh.hexdigest()
    name = os.path.basename(path)
    cache.set(FILE_CACHE_FMT % locals(), (mtime, value,), FILE_CACHE_TIMEOUT)
#

def get_cached_file(path, default=None):
    """ Get file content from cache.
        If modification time differ return None and delete
        data from cache.
    """
    
    sh = sha.new()
    sh.update(path)
    hash = sh.hexdigest()
    name = os.path.basename(path)
    key = FILE_CACHE_FMT % locals()
    
    cached = cache.get(key, default)
    if cached is None:
        return None
    mtime, value = cached
    
    if (not os.path.isfile(path)) or (os.path.getmtime(path) != mtime): # file is changed or deleted
        cache.delete(key) # delete from cache
        return None
    else:
        return value
#

[Jacob]

Can you please explain what this is and why you're filing it as a ticket?

[Nebojša Đorđević - nesh <nesh@…>]

Sorry, I didn't think before I send this ticket. :)

This is just pair of helper functions to manage cache entries which are dependent on some file stored data.

Probably ticket is not the right place for this, so I'm closing this.