Support Kupo; was: Kupo crashes when sending transaction via Hydra (tag: 'NewTx')

[f0rm4l1ty]

Context & versions

Versions:
Cardano Node: 10.1.4
Hydra Node: 0.19.0
Kupo: v2.10.0

I'm trying to send a transaction via the Hydra Node websocket (with this body)

{
    tag: 'NewTx',
    transaction: {
      type: 'Tx ConwayEra',
      cborHex: '84a300d9010281825820c9a5fb7ca6f55f07facefccb7c5d824eed00ce18719d28ec4c4a2e4041e85d9700018282581d605e4e214a6addd337126b3a61faad5dfe1e4f14f637a8969e3a05eefd1a000f424082581d6069830961c6af9095b0f2648dff31fa9545d8f0b6623db865eb78fde81a05e41793021a0002872da100d9010281825820f953b2d6b6f319faa9f8462257eb52ad73e33199c650f0755e279e21882399c058400b9b2c50b8dcf8ed0fec76676987c571b0fc1c12e6d5d4b956c635cde15592230908b40f45bea2f0b6cf62f49abc2a888a86e360c48fbbd5c70422011ba84c05f5f6'
    }
  }

Everything works in terms of the transaction being sent. However Kupo crashes when I send the event, with the following error.

{"severity":"Error","timestamp":"2025-01-15T02:25:55.24663166Z","thread":"11","message":{"Kupo":{"tag":"KupoUnexpectedError","exception":"MalformedOrUnexpectedResponse {bytesReceived = "{\"headId\":\"84e657e3dd5241caac75b749195f78684023583736cc08b2896290ab\",\"seq\":7,\"tag\":\"TxValid\",\"timestamp\":\"2025-01-15T02:25:55.244424483Z\",\"transaction\":{\"cborHex\":\"84a300d9010281825820c9a5fb7ca6f55f07facefccb7c5d824eed00ce18719d28ec4c4a2e4041e85d9700018282581d605e4e214a6addd337126b3a61faad5dfe1e4f14f637a8969e3a05eefd1a000f424082581d6069830961c6af9095b0f2648dff31fa9545d8f0b6623db865eb78fde81a05e41793021a0002872da100d9010281825820f953b2d6b6f319faa9f8462257eb52ad73e33199c650f0755e279e21882399c058400b9b2c50b8dcf8ed0fec76676987c571b0fc1c12e6d5d4b956c635cde15592230908b40f45bea2f0b6cf62f49abc2a888a86e360c48fbbd5c70422011ba84c05f5f6\",\"description\":\"Ledger Cddl Format\",\"txId\":\"a44363352298df3d9c5b3619ad9a8f2eee287b3c3dd25f4e97094e51cd1ef37c\",\"type\":\"Witnessed Tx ConwayEra\"}}", errorPath = [], hint = "DecoderErrorDeserialiseFailure \"PartialTransaction\" (DeserialiseFailure 3 \"expected list len or indef\")"}"}},"version":"v2.10.0+cd75b5"}

While this isn't necessarily a bug that causes me to not be able to use the Hydra Node; I've been told by the Kupo creator (KtorZ) that there may be an issue with "the format of the binary serialization of transactions" in the Hydra Node?

Direct quote from KtorZ (from the TxPipe Discord #Kupo channel)

The integration between Kupo and Hydra relies on binary serialisation of transactions; Kupo is now using the latest format as per the Cardano ledger, but Hydra is likely lagging a bit behind. The best way to "fix" this is to have Hydra upgrade to use a more recent ledger version.

I plan on heavily relying on Kupo (via the Kupmios Provider in Blaze https://github.com/butaneprotocol/blaze-cardano) to build transactions on L1 (to send to L2) for commit's, etc. I can also use Blaze + Kupo to decommit funds from Hydra back to L1 as well.

I understand that Hydra provides the /snapshot/utxos endpoint, but the rest of my script/backend for Cardano related stuff is utilizing Kupo, so it would be awesome for it to work.

This being said, it sounds like the Hydra Node is a little behind on how things get Deserialized (compared to Kupo maybe?). Is this something where I unfortunately will just have to wait for things to catch up on Hydra's side? I don't mind if that's the case.. just will need to figure out an alternative if the timeframe for the synchronization/fix is like a few months.

Thanks so much in advance for any insight you can provide. Thanks!

[ch1bo]

@f0rm4l1ty instead of using the kupmios provider (which requires a ogmios instance for transaction submission AFAIK), you could look into using this recently contributed Hydra provider butaneprotocol/blaze-cardano#230

[ch1bo]

We'll look into kupo support anyways using this issue.

[f0rm4l1ty]

We'll look into kupo support anyways using this issue.

Awesome thanks! And yeah, i'm going to use the Hydra provider in the meantime. 👍

[jinglescode]

@f0rm4l1ty we released the package, https://meshjs.dev/providers/hydra. Tested both submitTx (tag: 'NewTx) and commit are working.