Clean up some of the error handling code in Oak Functions #4502
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Mostly just more efficient use of
anyhow(instead of formatting bazillions of strings), but also one meaningful change:The
EncryptionHandler::invokehad anexpect()in it, which means that if someone sends an RPC with no public key, the server will promptly crash.The server should never panic on invalid user input, otherwise this provides a way how to DoS the server. This replaces the
expectwith proper error propagation, which should fail the RPC (but keep the server alive for other requests).