def calc_last_modified(request, *args, **kwargs):
"""
Returns the file's modified time as the last-modified date
"""
assert "cache_name" in kwargs, "Must specify cache_name as a keyword arg."
try:
cache = get_cache(kwargs["cache_name"])
assert isinstance(cache, FileBasedCache) or isinstance(
cache, LocMemCache), "requires file-based or mem-based cache."
except InvalidCacheBackendError:
return None
key = django_get_cache_key(request, cache=cache)
if key is None or not cache.has_key(key):
return None
if isinstance(cache, FileBasedCache):
fname = cache._key_to_file(cache.make_key(key))
if not os.path.exists(
fname
): # would happen only if cache expired AFTER getting the key
return None
last_modified = datetime.datetime.fromtimestamp(
os.path.getmtime(fname))
elif isinstance(cache, LocMemCache):
# It's either in the cache (and valid), and therefore anything since the server
# started would be fine.
# Or, it's not in the cache at all.
creation_time = cache._expire_info[cache.make_key(
key)] - settings.CACHE_TIME
last_modified = datetime.datetime.fromtimestamp(creation_time)
return last_modified
def calc_last_modified(request, *args, **kwargs):
"""
Returns the file's modified time as the last-modified date
"""
assert "cache_name" in kwargs, "Must specify cache_name as a keyword arg."
try:
cache = get_cache(kwargs["cache_name"])
assert isinstance(cache, FileBasedCache) or isinstance(cache, LocMemCache), "requires file-based or mem-based cache."
except InvalidCacheBackendError:
return None
key = django_get_cache_key(request, cache=cache)
if key is None or not cache.has_key(key):
return None
if isinstance(cache, FileBasedCache):
fname = cache._key_to_file(cache.make_key(key))
if not os.path.exists(fname): # would happen only if cache expired AFTER getting the key
return None
last_modified = datetime.datetime.fromtimestamp(os.path.getmtime(fname))
elif isinstance(cache, LocMemCache):
# It's either in the cache (and valid), and therefore anything since the server
# started would be fine.
# Or, it's not in the cache at all.
creation_time = cache._expire_info[cache.make_key(key)] - settings.CACHE_TIME
last_modified = datetime.datetime.fromtimestamp(creation_time)
return last_modified
def get_cache_key(path=None, url_name=None, cache=None, failure_ok=False):
"""Call into Django to retrieve a cache key for the given url, or given url name
NOTE: ONLY RETURNS CACHE_KEY IF THE CACHE_ITEM HAS BEEN CREATED ELSEWHERE!!!"""
assert (path or url_name) and not (
path
and url_name), "Must have path or url_name parameter, but not both"
if not cache:
cache = get_web_cache()
request = HttpRequest()
request.path = path or reverse(url_name)
request.session = {
settings.LANGUAGE_COOKIE_NAME: translation.get_language()
}
cache_key = django_get_cache_key(request, cache=get_web_cache())
if not cache_key and not failure_ok:
logging.warn(
"The cache item does not exist, and so could not be retrieved (path=%s)."
% request.path)
return cache_key
def get_cache_key(path=None, url_name=None, cache=None, failure_ok=False):
"""Call into Django to retrieve a cache key for the given url, or given url name
NOTE: ONLY RETURNS CACHE_KEY IF THE CACHE_ITEM HAS BEEN CREATED ELSEWHERE!!!"""
assert (path or url_name) and not (path and url_name), "Must have path or url_name parameter, but not both"
if not cache:
cache = get_web_cache()
request = HttpRequest()
request.path = path or reverse(url_name)
request.session = {settings.LANGUAGE_COOKIE_NAME: translation.get_language()}
cache_key = django_get_cache_key(request, cache=get_web_cache())
if not cache_key and not failure_ok:
pass#logging.warn("The cache item does not exist, and so could not be retrieved (path=%s)." % request.path)
return cache_key
