My code

http.py

    @defer.inlineCallbacks
    @cyclone.web.asynchronous
    def put(self):
        self.set_header('Content-Type', 'application/json')
        key = str(uuid4())
        today = datetime.today().strftime(u'%d/%m/%y %H:%M')
        user = self._get_current_user()[0]
        value = self._load_request_as_json().get('value')
        if not value:
            log.msg("PUT failed!")
            log.msg("Request didn't have a value to store.")
            raise cyclone.web.HTTPError(400, 'Malformed request.')
        data_dict = {u'data':value, u'date':today, u'from_user': user}
        json_dict = dumps(data_dict)
        del data_dict
        # self.settings.db is created by txredisapi.lazyShardedConnectionPool(address_list)
        # where address_list is something like ['192.168.0.154:6973', '192.168.0.105:6973', '127.0.0.1:6973']
        result = yield self.settings.db.set(key, json_dict)
        checksum = self._calculate_sha1_checksum(json_dict)
        del json_dict
        log.msg("Value stored at key %s." % key)
        self.finish(cyclone.escape.json_encode({u'key':key, u'checksum':checksum}))