ntp_time = int(time.time())
class NTPGetter(threading.Thread):
    def run(self):
        while True:
            ntp_time = self.getntp()
            time.sleep(3600)

    def getntp(self):
        start = time.time()
        TIME1970 = 2208988800L
        time_server = ('time.apple.com', 123)
        client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        data = '\x1b' + 47 * '\0'
        client.sendto(data, time_server)
        data, address = client.recvfrom(1024)
        t = struct.unpack( '!12I', data )[10]
        _log.debug(str((time.time() - start)) + ' ntp call')
        return t - TIME1970

def check_timeouts(bucket, timeout_time):
    for instance in botowrap.listBucket(bucket):
        t = instance.last_modified
        tuple_time = time.strptime(t, "%Y-%m-%dT%H:%M:%S.000Z")
        instance_time = time.mktime(tuple_time)
        last_seen = ntp_time + time.altzone - instance_time
        if last_seen > timeout_time:
            logging.info('%s has timed out' % instance.key)
            botowrap.deleteKey(instance)