SCU: a command can run under a package version the client was not compiled against
grants-discuss0 messages
- Hi all,
One observation from running Smart Contract Upgrade on a sandbox, with the exact errors, in case it saves someone a debugging session.
Setup: dpm 1.0.22, Daml SDK 3.4.11, single-participant `dpm sandbox` (its log banner says `Starting Canton version 3.5.18`), Daml Script 3.4.11 and the JSON API. Two versions of one package, 0.1.0 and 0.2.0, the second adding a trailing `Optional` field to one template; `dpm upgrade-check --both` passes for the pair.
The rule itself is documented: with no `package_id_selection_preference`, the participant resolves the package name to the highest vetted version. What the documentation does not show is how that looks from the client.
After 0.2.0 was vetted, a Daml Script compiled against 0.1.0 submitted an exercise with no preference. The ledger executed the 0.2.0 code and the resulting contract carried the 0.2.0 package id. The only failure was on the client, when the script runner could not translate the result: `Failed to translate create argument: Lookup(NotFound(Package(00a85a8b...)))`. The ledger side effect happened under a version the client had never seen, and the client's error says nothing about versions.
The mirror case: a script compiled against 0.2.0 and run before 0.2.0 was uploaded was not rejected. The participant resolved the name to the only vetted version, 0.1.0, executed that, and again only the runner failed, with `Lookup(NotFound(Package(3b3ac851...)))`. So "package not vetted" never appears as an error in this configuration.
Pinning works as documented: `packagePreference` in Daml Script, `packageIdSelectionPreference` on the JSON API. All of this is on one participant; we have not looked at how it behaves across participants.
One question, mostly for the Digital Asset people here: is there a recommended way for a client to state the version it was compiled against, so that a mismatch fails at submission rather than executing under another version and failing only on result translation?
Mykola Ilchuk
Woof - Hi, WoofThis list is intended for discussing DevFund grant proposals.Would you mind posting your observations and questions in the AppDev forum, here?https://forum.canton.network/c/developer-support/57Best regards,Wayne Collier
- Thanks, Wayne. Moved it to the App Development forum: https://forum.canton.network/t/scu-a-command-can-run-under-a-package-version-the-client-was-not-compiled-against/9213?u=woof-software