Version codec #1981
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Version codec #1981
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All function take now handshake codec as an argument, this is a preparation for further changes.
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This was referenced Apr 21, 2020
karknu
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ouroboros-network-framework/src/Ouroboros/Network/Protocol/Handshake/Codec.hs
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ouroboros-network/protocol-tests/Ouroboros/Network/Protocol/Handshake/Test.hs
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Decoding version numbers must be done in two steps to avoid failing if we receive a verions number that we don't know how to decode. For that reason we use 'CodecCBORTerm' record which encodes / decodes 'Codec.CBOR.Term.Term's. The requirement of 'Serialised' instance on version number is not yet removed, this will be done in next patch.
There are two changes in this patch: - Added argument to 'VersionMismatch' which includes tags of versions that we were unable to decode. Knowning only about versions we know is not that helpful. - Reimplement its codec using 'CodecCBORTerm' for encoding / decoding version numbers.
This is 'Hanshake' codec which which is using 'Unversioned' version numbers - used in tests.
test-cddl requires path to the `message.cddl` file, which is different for `nix` and `cabal`.
This allows to configure node to use a particular set of protocols, instead of just the compiled it ones.
This only seems unrelated to this patch set, I will use this test in the following patch.
Asymmetric in the sense that the client and server codecs are different. The server understands only a subset of versions that the client can propose.
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This PR changes how Handshake codec works. Previously it would fail if
an unknown version number was submitted, now it will not.
This change should not change wire format of the handshake messages.
In addition it allows to confiugure which protocols versions are used by
consensus, there will be an accompanying PR in
cardano-noderepository whichadds an option to the confituration file.
I hope this fixes #1971, though I havent tested it (for that we need a new protocol
version).