PSET: Various fixes#1121
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code review ACK 32c3a98. Double checked that rust-elements parser and parser that allen implemnted https://tools.blockstream.com/psbt parses the new serialization correctly.
apoelstra
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A single 0x00 byte indicates a zero length field; we must skip parsing that field otherwise the length will be expected to be read again for the vector that is passed in to revieve the value. This allows PSBT_ELEMENTS_GLOBAL_SCALAR to be parsed when it is serialized according to the spec, i.e. both of the following cases will correctly parse to the same representation: $cli decodepsbt 'cHNldP8B+wQCAAAAAQIEAgAAAAEEAQABBQEAJ/wEcHNldAABAgMEBQYHCAkKCwwNDg8QERITFBUWFxgZGhscHR4fIAEAAA==' and $cli decodepsbt 'cHNldP8B+wQCAAAAAQIEAgAAAAEEAQABBQEAJ/wEcHNldAABAgMEBQYHCAkKCwwNDg8QERITFBUWFxgZGhscHR4fIAAA' PSBT_ELEMENTS_GLOBAL_SCALAR is the only PSBT/PSET field that contains key data but no value data and so is the only field that currently hits this special case.
Note the re-parsing of the correct serialization is covered by the existing PSBT tests which process PSBTs containing scalars.
While the order of fields is not explicit in the PSBT/PSET specifications, third parties need to be able to support both with a single implementation. Keeping the PSBT fields in the same order makes this significantly easier.
ASSET_COMMITMENT and ASSET were in the wrong order, which prevents simply iterating the constants in simple parsers/writers.
As for outputs. ISSUANCE_VALUE_COMMITMENT and ISSUANCE_VALUE were misordered.
This makes global handling forwards-compatible when new fields are added, and un-breaks any PSET implementations that serialize PSBT_ELEMENTS_GLOBAL_TX_MODIFIABLE (which Elements does not yet implement).
This allows these test cases to be re-used by alternate implementations for round-trip serialization testing.
I found this useful for for creating test cases and checking validity. In the event that alternative implementations do not aim for exact serilization compatibility, this RPC can be used to validate and re-serialize their output for testing.
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apoelstra
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…lements 22rc3.
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parsepsbtrpc for testingFixes #1065