def get_current_user(user=None):
if not user:
user = users.get_current_user() # while - url: .* login: required not necessary
if user:
user_cache = memcache.get("user-"+user.email())
if user_cache is None:
user_cache = User.get_by_key_name(user.email())
if user_cache:
memcache.add("user-"+user.email(), user_cache)
return user_cache
