Use LDAP hostname with regular DNS lookup to check if LDAP is online.
Before that, we used the IP address that was extracted via the docker
client (not via DNS lookup) and it could happen that LDAP was reachable
via the IP, thus passing the online check, but not via DNS lookup, which
led to test failures (e.g. LDAP not reachable from ClickHouse instance).
Sometimes the requests library detect the encoding incorrectly, and
because this test compares binary data it fails.
Here is an example of successfull attempt:
2023-10-30 07:32:37 [ 654 ] DEBUG : http://172.16.1.2:8123 "GET /?query=SELECT+%2A+FROM+test.simple+FORMAT+Protobuf+SETTINGS+format_schema%3D%27simple%3AKeyValuePair%27 HTTP/1.1" 200 None (connectionpool.py:546, _make_request)
2023-10-30 07:32:37 [ 654 ] DEBUG : Encoding detection: utf_8 will be used as a fallback match (api.py:480, from_bytes)
2023-10-30 07:32:37 [ 654 ] DEBUG : Encoding detection: Found utf_8 as plausible (best-candidate) for content. With 0 alternatives. (api.py:487, from_bytes)
And here is failed [1]:
2023-10-29 18:12:56 [ 525 ] DEBUG : http://172.16.9.2:8123 "GET /?query=SELECT+%2A+FROM+test.simple+FORMAT+Protobuf+SETTINGS+format_schema%3D%27message_tmp%3AMessageTmp%27 HTTP/1.1" 200 None (connectionpool.py:547, _make_request)
2023-10-29 18:12:56 [ 525 ] DEBUG : Encoding detection: Found utf_16_be as plausible (best-candidate) for content. With 1 alternatives. (api.py:487, from_bytes)
E AssertionError: assert '܈Ē͡扣܈Ȓͤ敦' == '\x07\x08\x01\x12\x03abc\x07\x08\x02\x12\x03def'
E - abcdef
E + ܈Ē͡扣܈Ȓͤ敦
[1]: https://s3.amazonaws.com/clickhouse-test-reports/56030/c7f392500e93863638c9ca9bd56c93b3193091f3/integration_tests__release__[3_4].html
Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
