def get_last_tid(self):
        try:
            spec = {'tid': {'$gt': 0}}
            sort = [('tid', -1)]
            row = self.db.docs.find_one(spec, sort=sort)
        except Exception as e:
            raise DatabaseException(e)
        if row:
            return row['tid']
        return 0
def test_real_config_with_options(self, tempdir):
        config = """
        [pipeline:main]
        pipeline = cache proxy-server

        [app:proxy-server]
        use = egg:swift#proxy

        [filter:cache]
        use = egg:swift#memcache
        memcache_servers = 10.0.0.1:11211,10.0.0.2:11211,10.0.0.3:11211,
            10.0.0.4:11211
        connect_timeout = 1.0
        pool_timeout = 0.5
        tries = 4
        io_timeout = 1.0
        tls_enabled = true
        """
        config_path = os.path.join(tempdir, 'test.conf')
        with open(config_path, 'w') as f:
            f.write(dedent(config))
        memcache_ring = self._loadapp(config_path)
        self.assertEqual(sorted(memcache_ring._client_cache.keys()),
                         ['10.0.0.%d:11211' % i for i in range(1, 5)])
        # extra options
        self.assertEqual(memcache_ring._connect_timeout, 1.0)
        self.assertEqual(memcache_ring._pool_timeout, 0.5)
        # tries is limited to server count
        self.assertEqual(memcache_ring._tries, 4)
        self.assertEqual(memcache_ring._io_timeout, 1.0)
        self.assertEqual(memcache_ring._error_limit_count, 10)
        self.assertEqual(memcache_ring._error_limit_time, 60)
        self.assertEqual(memcache_ring._error_limit_duration, 60)
        self.assertIsInstance(
            list(memcache_ring._client_cache.values())[0]._tls_context,
            ssl.SSLContext)