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Instead of classifying errors and complicating our behavior _early_
in our loop, instead we just decide whether an error indicates an
EOF immediately before we return it.
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Previously, after determining that an error on an RPC connection
was fatal, we would:
1. Determine whether it was a "clean" close or one
that needed to be logged.
2. In exactly one case (specifically, when the inbound Json stream
contained a Value that was not an Object) , we would send back a
message to the client.
3. Exit the connection with Ok() or Err(e).
We no longer do step "2" above.
Additionally, we document:
- Why it's important to exit immediately on syntax errors.
- A better way to tolerate non-Object Json Values,
if we decide someday to do so.
Closes #1591.
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Right now, this lets us say whether the method was unrecognized or
whether the parameter type was incorrect.
We'll use this to enforce correct method names later on.
(I have to add another `inventory` here, since the `typetag`
maintainer does not want to expose this functionality: see
https://github.com/dtolnay/typetag/issues/57#issuecomment-1506106290
)
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This is a bit big, but it's not that _complicated_.
The idea here is that we use serde's "untagged" enum facility
when parsing our `Request`s, such that if parsing as a `Request`
fails, we parse as an `InvalidRequest` and try to report
what the problem was exactly.
This lets us determine the ID of a request (if it had one),
so we can report that ID in our error message. We can also
recover from a much broader variety of errors.
We now also conform with the spec reporting errors about
completely wrong json, requests without IDs, and so on.
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