memory: add method isContactConnected

src/memory/memory.py

@@ -420,6 +420,22 @@ class Memory(object):
         log.debug("Memory getPresenceStatus (%s)" % entities_presence)
         return entities_presence
 
+    def isContactConnected(self, entity_jid, profile_key):
+        """Tell from the presence information if the given contact is connected.
+
+        @param entity_jid (JID): the entity to check
+        @param profile_key: %(doc_profile_key)s
+        @return: boolean
+        """
+        profile = self.getProfileName(profile_key)
+        if not profile:
+            raise exceptions.ProfileUnknownError(_('Trying to get entity data for a non-existant profile'))
+        try:
+            presence = self._entities_cache[profile][entity_jid]['presence']
+            return len([True for status in presence.values() if status[0] != 'unavailable']) > 0
+        except KeyError:
+            return False
+
     def setPresenceStatus(self, entity_jid, show, priority, statuses, profile_key):
         """Change the presence status of an entity
         @param entity_jid: jid.JID of the entity