add resourceunavailable error code with more guidance #2430
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Add
ResourceUnavailable
back in with explicit guidance that it is currently only a valid response forBlocksByRange
and also that such unsynced nodesSHOULD
respond using it.Conversations on #2414 debate if/how this should be inserted. The crux is that some teams think the extra information will be valuable whereas others think it is only cumbersome without reducing complexity. I think the restricted use in this PR is a reasonable compromise.
Additionally for any client that finds the introduction of this error case as cumbersome/complex, I suggest that the receiving of this error code just gets put into the already existing
if bad_block_range_response()
control flow. If the information is indeed not valuable, it can easily just be lumped into the existing "bad response" code.