class Subscriptions:
def __init__(self, subscriptions_file):
""" Open/create a subscriptions list for the named webbox URI. """
self.store = DiskStore(subscriptions_file)
def _safe_hash(self, key):
""" Turn a rdflib (or whatever) object into an ascii string to use as a DBM/Shelve key, ignore unicode errors. """
u = unicode(key)
a = u.encode("ascii", "replace") # replace means that non-ascii characters are replaced with a '?'
return hashlib.sha256(a).hexdigest() # hash
def subscribe(self, person_uri, resource_uri):
""" Subscribe person to resource. """
subscribers = self._get(resource_uri)
if person_uri not in subscribers:
subscribers.append(person_uri)
self._add({resource_uri: subscribers})
return None # success
def unsubscribe(self, person_uri, resource_uri):
""" Unsubscribe person from resource. """
subscribers = self._get(resource_uri)
if person_uri in subscribers:
subscribers.remove(person_uri)
self._add({resource_uri: subscribers})
return None # success
def get_subscribers(self, resource_uri):
""" Get a list of subscribers for a resource. """
subscribers = self._get(resource_uri)
if subscribers is None:
subscribers = []
return subscribers
def _add(self, hashes):
for key in hashes:
# self.store[self._safe_hash(key)] = hashes[key]
self.store.set(key, hashes[key])
# self.store.sync()
def _get(self, hashed):
return self.store.get(hashed)
def __init__(self, subscriptions_file):
""" Open/create a subscriptions list for the named webbox URI. """
self.store = DiskStore(subscriptions_file)
