We were using per-type overrides which caused some asymmetries, where
conversions could end up dropping fields as we went along. Essentially
each conversion would need to override a superset of the previous one,
which then caused issues when attempting to close the loop. By
overriding on the model level we ensure that all representations are
equivalent and convertible into one another, at the expense of
overriding a bit more aggressively, which should be fine anyway.
We build an in-memory model of what the API should look like, which
will later be used to generate a variety of bindings. In this PR we
will use the model to build structs corresponding to the requests and
responses for the various methods.
The JSON-RPC schemas serve as ground-truth, however they are missing a
bit of context: methods, and the request-response matching (as well as
a higher level grouping we'll call a Service). I'm tempted to create a
new document that describes this behavior and we could even generate
the rather repetitive JSON schemas from that document. Furthermore
it'd allow us to add some required metadata such as grpc field
numbering once we generate those bindings.
Changelog-Added: JSON-RPC: A new `msggen` library allows easy generation of language bindings for the JSON-RPC from the JSON schemas
Christian Decker