Support using the extensions in the genesis build

[liuchengxu]

Is there an existing issue?

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• This is not a support question.

Motivation

We would like to use sp_io::misc::read_version to read the runtime version from the wasm blob in the genesis build, which unfortunately runs into an error that the extension is unavailable at that time. It turns out BasicExternality which has no extensions registered is used in the genesis build. The workaround for now is to avoid using any extension functionality at genesis, but it's a generally nice-to-have feature that will be beneficial to the entire community IMO.

substrate/frame/support/procedural/src/construct_runtime/expand/config.rs

Line 93 in 3fee5c7

#scrate::BasicExternalities::execute_with_storage(storage, || {

Request

Use a more proper externality with all extensions registered in the production env for the genesis build. The alternative is to add a way to allow users to register the extension as needed on their own.

Solution

No response

Are you willing to help with this request?

Yes!