Entry Point: XCM instruction

[xlc]

Design and propose RFC to XCM to add instruction to execute XCQ via XCM

ReportQuery {
  query: SizeLimitedXcq,
  weight_limit: Option<Weight>,
  info: QueryResponseInfo,
}

It should execute the query and send a QueryResponse back with the XcqResult in the response.

[tiagobndr]

Hey @xlc, very cool to see this! It's super relevant to the XCM support in Polkadot Hub Contracts (#6775) we're working on, mainly to enable smart contracts on our platform to retrieve data from a remote chain (e.g. to then trigger specific internal functionality based on the result). I was wondering if there has been any progress on this?

[xlc]

@tiagobndr RFC is ready for review polkadot-fellows/RFCs#126

You can check if it is going to suit your requirements.

PoC is ready in this repo and we are working to finish the XCM integrations. We should be able to make a demo soonish.

PVQ is not going to cover how smart contracts going to invoke XCM but assume that's addressed, I can see we can have smart contracts invoke XCM with some PVQ blob to be executed on remote chain to query information

[mise42]

Hi @tiagobndr , the XCM PoC is ready now. In the PoC, we use fixed weight since the specific conversion between gas and weight is under development now.