(Lazy Eval) def wait_for_messages(self, callback, cursor=None): if cursor: new_count = 0 for msg in reversed(self.cache): if msg["id"] == cursor: break new_count += 1 if new_count: callback(self.cache[-new_count:]) return self.waiters.add(callback) ! def cancel_wait(self, callback): self.waiters.remove(callback) ! class MessageNewHandler(BaseHandler): @tornado.web.authenticated @gen.coroutine def post(self): message = { "id": str(uuid.uuid4()), "from": self.current_user["first_name"], "body": self.get_argument("body"), } ! cursor = collection.find({'$or': [{'teamA': self.get_argument("body")},{'teamB' new_message = [self.get_argument("body"),"Matches:"] withMatch = False while (yield cursor.fetch_next): document = cursor.next_object() withMatch = True try: matchDatetime = document.get('data').get('prematch').get('match').get(' except: try: matchDatetime = document.get('data').get('match').get('start_time') except: pass ! print matchDatetime msg_str = matchDatetime+':'+document.get('teamA','')+' v '+ document.get('t if isinstance(document.get('goalA'), int ): msg_str = msg_str+' '+str(document.get('goalA',''))+' : '+ str(document new_message.append(msg_str) !