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fix(core): encode absent tx access_list correctly #1137
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The optional access list on `Transaction` was being incorrectly encoded as an empty string (0x80) when omitted, when it should be encoded as an empty list (0xc0). Fixes gakonst#1134.
michaelsproul
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gakonst
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Apr 13, 2022
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Motivation
The optional access list on
Transactionwas being incorrectly encoded as an empty string (0x80) when omitted, when it should be encoded as an empty list (0xc0).Fixes #1134.
Solution
Add a new function
rlp_opt_listfor encoding optional RLP list structures. It encodes an empty list when its argument isNone. The new testrlp_london_no_access_listensures that the encoding of a transaction with aNoneaccess list matches the encoding of a transaction with an empty access list. The expected encoding is exactly the same as for therlp_londontest.The transaction request types are unaffected as they have non-optional access lists.
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