Connect Method without default watcher

[jgould22]

I am trying to use tokio_zookeeper to connect to a clickhouse-keeper instance (outside the scope of this project I know)

Clickhouse keeper does not support these features

    - addWatch doesn't work with PERSISTENT watches
    - removeWatch and removeAllWatches aren't supported
    - setWatches isn't supported

Which is why I assume I am getting errors when trying to connect

Error { source: None, message: "failed to enqueue new request: Canceled" }

I realize that the default watcher is to keep consistency with the Java client implementation but would it be possible (acceptable?) to figure out a connection without the watcher?

[lfrancke]

Hi @jgould22! Thanks for reaching out.

We'd be happy to review and accept that feature, yes. But we probably won't spend time on actually implementing it, so PRs are welcome :)

[jgould22]

Cool, I will see what I can put together then.

[jgould22]

I thought the watcher might be the source of my problems so I implemented #59

However the problem remains so I will still have to poke at it. The small test in that PR produces

running 1 test
2026-02-24T21:48:43.676114Z DEBUG tokio_zookeeper: about to perform handshake
2026-02-24T21:48:43.676243Z DEBUG poll:poll_enqueue: tokio_zookeeper::proto::packetizer: enqueueing request item=Connect { protocol_version: 0, last_zxid_seen: 0, timeout: 0, session_id: 0, passwd: [], read_only: false } xid=0
2026-02-24T21:48:43.676574Z DEBUG poll:poll_read{exiting=false}:poll_read: tokio_zookeeper::proto::active_packetizer: server closed connection
2026-02-24T21:48:43.676644Z  INFO poll: tokio_zookeeper::proto::packetizer: connection lost; reconnecting session_id=0 last_zxid=0
test tests::connect_without_watcher_test ... FAILED

So I will have to dig into it a little more

[jgould22]

Ok so after poking at it a bit more it looks like 2 things

• Click-house keeper is more strict about the hand shake, while tokio-zookeeper passes a vec![] CHK demands 16. This is fixed with setting those bytes to 0s instead of [] a1f2b78
• The second thing is that it looks like Clickhouse keeper doesnt always return a read_only byte which causes the parsing to fail. 1fbb55e

I am not entirely sure that these quirks follow the zookeeper protocol but fixing them seems to allow the tests to pass