Smoldot should check the API version of the runtime specs before doing a call

[tomaka]

Right now smoldot just assumes that runtime functions exist and match a certain API. Unfortunately, the runtime function APIs can change while keeping the same name. The authoritative thing here is the apis field of the runtime spec.

[tomaka]

cc #1975

[tomaka]

I believe a good way to do this is to build the CoreVersion in HostVmPrototype::new and then hold it in the HostVmPrototype.
Then the runtime_host and read_only_runtime_host should require an API name and version.

Also relates to #1107

[tomaka]

According to paritytech/substrate#8688, the apis field is actually more or less deprecated.
It seems that the design of Substrate does not consist in checking apis.

This issue could be closed as "wontfix", but I'm leaving it open because we need a substitute mechanism and I don't know which yet.

[tomaka]

According to paritytech/substrate#8688, the apis field is actually more or less deprecated.
It seems that the design of Substrate does not consist in checking apis.

This turned out to be completely wrong. The field isn't deprecated at all.