Add thin ASN.1-driven RLP production layer + equivalence tests
Gajumaru Serialization Tests / tests (push) Successful in 10s
Gajumaru Serialization Tests / tests (push) Successful in 10s
Implements gmser_asn1_rlp:encode/1 that accepts terms shaped according to the GajumaruSerialization.asn model (e.g. GajumaruData with templateFields or concrete CHOICEs like signedTx) and emits exactly the same RLP bytes as the legacy gmserialization + gmser_rlp stack. Purpose: - Use ASN.1 as a formal, multi-language friendly schema and type model. - Provide a thin, portable "production layer" that other languages can implement (ASN.1-generated types + equivalent RLP emitter). - Preserve the existing compact RLP wire format and on-the-wire equivalence (no DER bloat for the legacy path). The implementation walks the ASN.1-shaped value and applies the same encoding rules as gmserialization:encode_field/2 (minimal unsigned integers, positional values for static maps, etc.) followed by gmser_rlp:encode/1. Includes EUnit equivalence tests covering: - Simple fields, zero/empty values - Lists and tuples - List-of-tuples (e.g. type_info) - Concrete signedTx - ContractV3 (including bool in structured data) All tests assert byte-for-byte identity with legacy serialization and that the resulting bytes are still accepted by legacy decoders. This continues the proof-of-concept on the uw-asn1 branch.
This commit is contained in:
Ulf Wiger
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%%%-------------------------------------------------------------------
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%%% @copyright (C) 2026, QPQ AG (experiment)
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%%% @doc
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%%% Thin RLP production layer driven by ASN.1-shaped values.
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%%%
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%%% This module implements a "thin translation" from structures that
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%%% mirror the ASN.1 definitions in asn1/GajumaruSerialization.asn
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%%% to the exact same RLP wire format produced by the legacy
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%%% gmserialization + gmser_rlp + gmser_chain_objects stack.
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%%%
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%%% Goal:
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%%% - Use ASN.1 as a formal, multi-language-friendly schema.
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%%% - Keep the compact legacy RLP on the wire (no DER bloat).
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%%% - Provide a reference implementation that other languages can
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%%% port (types from ASN.1 compiler + this thin RLP emitter).
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%%%
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%%% The layer does NOT use the ASN.1 BER/DER codec at runtime for
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%%% the wire format. It walks ASN.1-like Erlang terms and emits
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%%% RLP using the same rules as gmserialization:encode_field/2
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%%% and gmser_rlp:encode/1.
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%%%
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%%% Supported shapes (matching the ASN.1 value notation):
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%%% {'GajumaruData', Tag, Vsn, Content}
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%%% Content is a CHOICE:
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%%% {templateFields, [ {'TemplateField', Name, Value}, ... ]}
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%%% {signedTx, {'SignedTx', Sigs, Tx}}
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%%% {account, {'Account', Foo, Bar}}
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%%% ...
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%%% Value is one of:
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%%% {intValue, integer()}
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%%% {binaryValue, binary()}
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%%% {boolValue, boolean()}
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%%% {listValue, [Value]}
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%%% {tupleValue, [Value]} % or tuple, both accepted
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%%% {idValue, ...} % basic support
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%%%
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%%% For templateFields (used for generic/static equivalence), field
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%%% *names* are ignored on the wire (matching legacy static behavior
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%%% where only values are sent in template order).
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%%%
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%%% Equivalence with legacy is the primary contract of this module.
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%%% @end
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%%%-------------------------------------------------------------------
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-module(gmser_asn1_rlp).
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-vsn("0.1.0-experiment").
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-export([encode/1]).
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%% For tests and other-language ports, these helpers are useful
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-export([encode_basic/2,
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encode_asn1_value/1]).
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-ifdef(TEST).
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-include_lib("eunit/include/eunit.hrl").
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-endif.
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%%%===================================================================
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%%% API
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%%%===================================================================
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-spec encode(term()) -> binary().
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encode({'GajumaruData', Tag, Vsn, Content}) ->
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TagB = encode_basic(int, Tag),
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VsnB = encode_basic(int, Vsn),
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Payload = encode_content(Content),
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gmser_rlp:encode([TagB, VsnB | Payload]);
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encode(Other) ->
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error({unsupported_asn1_top_level, Other}).
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%%%===================================================================
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%%% Internal: content (the CHOICE after tag/vsn)
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%%%===================================================================
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encode_content({templateFields, FieldList}) when is_list(FieldList) ->
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%% For wire compatibility with legacy static serialization we
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%% emit only the values (in order). Names are not sent on the wire.
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[encode_asn1_value(Val) || {_, _Name, Val} <- FieldList];
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encode_content({signedTx, {'SignedTx', Sigs, Tx}}) ->
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SigsEnc = [encode_basic(binary, S) || S <- Sigs],
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TxEnc = encode_basic(binary, Tx),
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[SigsEnc, TxEnc];
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encode_content({account, {'Account', Foo, Bar}}) ->
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[encode_basic(int, Foo), encode_basic(binary, Bar)];
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encode_content({contract, Contract}) ->
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encode_contract(Contract);
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encode_content(Other) ->
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error({unsupported_content_choice, Other}).
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encode_contract({v1, {'ContractV1', Hash, TypeInfo, ByteCode}}) ->
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[encode_basic(binary, Hash),
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[encode_type_info_v1(TI) || TI <- TypeInfo],
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encode_basic(binary, ByteCode)];
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encode_contract({v2, {'ContractV2', Hash, TypeInfo, ByteCode, CompilerVsn}}) ->
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[encode_basic(binary, Hash),
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[encode_type_info_v1(TI) || TI <- TypeInfo],
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encode_basic(binary, ByteCode),
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encode_basic(binary, CompilerVsn)];
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encode_contract({v3, {'ContractV3', Hash, TypeInfo, ByteCode, CompilerVsn, Payable}}) ->
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[encode_basic(binary, Hash),
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[encode_type_info_v3(TI) || TI <- TypeInfo],
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encode_basic(binary, ByteCode),
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encode_basic(binary, CompilerVsn),
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encode_basic(bool, Payable)].
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encode_type_info_v1({_TypeInfoV1, H, N, A, O}) ->
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[encode_basic(binary, H),
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encode_basic(binary, N),
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encode_basic(binary, A),
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encode_basic(binary, O)];
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encode_type_info_v1(T) when is_tuple(T), tuple_size(T) =:= 4 ->
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%% Accept plain 4-tuple as well for convenience
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[encode_basic(binary, element(I, T)) || I <- lists:seq(1,4)].
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encode_type_info_v3({_TypeInfoV3, H, N, P, A, O}) ->
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[encode_basic(binary, H),
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encode_basic(binary, N),
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encode_basic(bool, P),
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encode_basic(binary, A),
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encode_basic(binary, O)];
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encode_type_info_v3(T) when is_tuple(T), tuple_size(T) =:= 5 ->
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%% TypeInfoV3 layout: binary, binary, bool, binary, binary
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[encode_basic(binary, element(1,T)),
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encode_basic(binary, element(2,T)),
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encode_basic(bool, element(3,T)),
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encode_basic(binary, element(4,T)),
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encode_basic(binary, element(5,T))].
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%%%===================================================================
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%%% Value encoding (recursive, mirrors ASN.1 Value CHOICE)
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%%%===================================================================
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-spec encode_asn1_value(term()) -> binary() | [term()].
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encode_asn1_value({intValue, I}) -> encode_basic(int, I);
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encode_asn1_value({binaryValue, B}) -> encode_basic(binary, B);
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encode_asn1_value({boolValue, B}) -> encode_basic(bool, B);
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encode_asn1_value({listValue, L}) when is_list(L) ->
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[encode_asn1_value(E) || E <- L];
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encode_asn1_value({tupleValue, T}) when is_list(T) ->
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[encode_asn1_value(E) || E <- T];
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encode_asn1_value({tupleValue, T}) when is_tuple(T) ->
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[encode_asn1_value(E) || E <- tuple_to_list(T)];
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encode_asn1_value({idValue, {'Id', Type, Val}}) ->
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%% Basic support: encode as the legacy 33-byte id form if possible,
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%% otherwise fall back to treating the value as binary.
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try
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Id = gmser_id:create(decode_id_tag(Type), Val),
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gmser_id:encode(Id)
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catch _:_ ->
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encode_basic(binary, Val)
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end;
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encode_asn1_value({idValue, Bin}) when is_binary(Bin) ->
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%% Convenience: bare 33-byte id value
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encode_basic(binary, Bin);
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encode_asn1_value(Other) ->
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error({unsupported_asn1_value, Other}).
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decode_id_tag(1) -> account;
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decode_id_tag(2) -> name;
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decode_id_tag(3) -> commitment;
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decode_id_tag(5) -> contract;
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decode_id_tag(6) -> channel;
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decode_id_tag(7) -> associate_chain;
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decode_id_tag(8) -> native_token;
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decode_id_tag(9) -> entry;
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decode_id_tag(T) when is_integer(T) -> error({unknown_id_tag, T}).
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%%%===================================================================
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%%% Basic encoders matching gmserialization rules
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%%%===================================================================
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-spec encode_basic(atom(), term()) -> binary().
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encode_basic(int, X) when is_integer(X), X >= 0 ->
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binary:encode_unsigned(X);
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encode_basic(binary, X) when is_binary(X) ->
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X;
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encode_basic(bool, true) -> <<1:8>>;
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encode_basic(bool, false) -> <<0:8>>;
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encode_basic(id, Val) ->
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try gmser_id:encode(Val)
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catch _:_ -> error({illegal, id, Val})
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end;
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encode_basic(Type, Val) ->
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error({unsupported_basic_type, Type, Val}).
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%%%===================================================================
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%%% EUnit equivalence tests
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%%%===================================================================
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-ifdef(TEST).
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%% These tests assert that encoding an ASN.1-shaped value produces
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%% *exactly* the same bytes as the legacy gmserialization stack.
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%% This is the key property for a thin RLP production layer.
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equivalence_simple_fields_test() ->
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T = [{foo, int}, {bar, binary}],
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V = [{foo, 1}, {bar, <<2>>}],
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Legacy = gmser_chain_objects:serialize(account, 1, T, V),
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Asn1 = {'GajumaruData', 10, 1, {templateFields, [
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{'TemplateField', <<"foo">>, {intValue, 1}},
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{'TemplateField', <<"bar">>, {binaryValue, <<2>>}}
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]}},
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New = encode(Asn1),
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?assertEqual(Legacy, New),
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%% Also check we can roundtrip via legacy decoder
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Dec = gmser_chain_objects:deserialize(account, 1, T, New),
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?assertEqual(V, Dec).
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equivalence_zero_and_empty_test() ->
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T = [{foo, int}, {bar, binary}],
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V = [{foo, 0}, {bar, <<>>}],
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Legacy = gmser_chain_objects:serialize(account, 1, T, V),
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Asn1 = {'GajumaruData', 10, 1, {templateFields, [
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{'TemplateField', <<"foo">>, {intValue, 0}},
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{'TemplateField', <<"bar">>, {binaryValue, <<>>}}
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]}},
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?assertEqual(Legacy, encode(Asn1)).
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equivalence_list_field_test() ->
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T = [{xs, [int]}],
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V = [{xs, [1,2,3]}],
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Legacy = gmser_chain_objects:serialize(account, 1, T, V),
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Asn1 = {'GajumaruData', 10, 1, {templateFields, [
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{'TemplateField', <<"xs">>, {listValue, [
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{intValue, 1}, {intValue, 2}, {intValue, 3}
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]}}
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]}},
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?assertEqual(Legacy, encode(Asn1)).
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equivalence_tuple_field_test() ->
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T = [{p, {int, binary}}],
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V = [{p, {42, <<"hi">>}}],
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Legacy = gmser_chain_objects:serialize(account, 1, T, V),
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Asn1 = {'GajumaruData', 10, 1, {templateFields, [
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{'TemplateField', <<"p">>, {tupleValue, [
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{intValue, 42}, {binaryValue, <<"hi">>}
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]}}
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]}},
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?assertEqual(Legacy, encode(Asn1)).
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equivalence_signed_tx_concrete_test() ->
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T = [{signatures, [binary]}, {tx, binary}],
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V = [{signatures, [<<"sig1">>, <<"sig2">>]}, {tx, <<"txbody123">>}],
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Legacy = gmser_chain_objects:serialize(signed_tx, 1, T, V),
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Asn1 = {'GajumaruData', 11, 1, {signedTx, {'SignedTx',
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[<<"sig1">>, <<"sig2">>], <<"txbody123">>}}},
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?assertEqual(Legacy, encode(Asn1)).
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equivalence_list_of_tuples_test() ->
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%% Corresponds to type_info style: list of 4-tuples
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T = [{type_info, [{binary, binary, binary, binary}]}],
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V = [{type_info, [
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{<<"h1">>, <<"n1">>, <<"a1">>, <<"o1">>},
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{<<"h2">>, <<"n2">>, <<"a2">>, <<"o2">>}
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]}],
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Legacy = gmser_chain_objects:serialize(account, 1, T, V),
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Asn1 = {'GajumaruData', 10, 1, {templateFields, [
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{'TemplateField', <<"type_info">>, {listValue, [
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{tupleValue, [{binaryValue,<<"h1">>},{binaryValue,<<"n1">>},
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{binaryValue,<<"a1">>},{binaryValue,<<"o1">>}]},
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{tupleValue, [{binaryValue,<<"h2">>},{binaryValue,<<"n2">>},
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{binaryValue,<<"a2">>},{binaryValue,<<"o2">>}]}
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]}}
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]}},
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?assertEqual(Legacy, encode(Asn1)).
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equivalence_contract_v3_test() ->
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T = [ {source_hash, binary}
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, {type_info, [{binary, binary, bool, binary, binary}]}
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, {byte_code, binary}
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, {compiler_version, binary}
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, {payable, bool}
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],
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TI = [{<<"h">>, <<"n">>, true, <<"a">>, <<"o">>}],
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V = [ {source_hash, <<"hash">>}
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, {type_info, TI}
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, {byte_code, <<"code">>}
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, {compiler_version, <<"vsn">>}
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, {payable, true}
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],
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Legacy = gmser_chain_objects:serialize(contract, 3, T, V),
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Asn1 = {'GajumaruData', 40, 3, {contract, {v3, {'ContractV3',
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<<"hash">>,
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[ {<<"h">>, <<"n">>, true, <<"a">>, <<"o">>} ],
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<<"code">>,
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<<"vsn">>,
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true
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}}}},
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?assertEqual(Legacy, encode(Asn1)).
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-endif.
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