Export RuntimeError for RPC calls

[gregdhill]

This RPC returns Result<(), DispatchError> in the response body. I don't think it is currently possible to cast the generated DispatchError to RuntimeError because it is not exported.

[gregdhill]

Related: Deserialize is not implemented for DispatchError @jsdw do you know how to solve this?

[jsdw]

#427 Seems perfectly reasonable to me and would enable you to create an instance of the Error<E> type!

Merging that issue closed this; is that fair or would you prefer this stay open?

Hmm Deserialize not being implemented; that's a bit more tricky. At the mo, DispatchError is generated and given the same bounds as other generated types. You could try something like this:

#[subxt::subxt(
    runtime_metadata_path = "path/to/metadata.scale",
    generated_type_derives = "Deserialize"
)]

Which adds Deserialize to add types, but I somehow suspect it wouldn't work!

If you know the shape of your DispatchError, I suppose you could manually write a deserialize function or wrapping type to do so; it depends on what your aim is really?

[gregdhill]

@jsdw please see my approach here, although it is not particularly elegant...