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(Another) High level Ethereum RPC Client for Elixir
License: Apache License 2.0
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web3x's Issues
Contract calls that return multiple arrays raise an error when decoding result
Web3x.Contract.call/3 raises with certain output signatures, particularly when the output type is (uint256[],string[]).
When calling ABI.decode/3 with the function selector struct, and when calling ABI.decode/2 with the signature string syntax it decodes correctly:
ABI.decode(fs, output_data, :output)
[[1], ["bar"]]
ABI.decode("foo(uint256[],string[])", output_data)
[[1], ["bar"]]When using the Web3x.Contract module, the following is eventually called within Web3.Abi.decode_output/3:
ABI.decode("foo((uint256[],string[]))", output_data)which raises with the following stack trace:
** (MatchError) no match of right hand side value: <<99, 115, 120, 99, 121, 100, 106, 121, 52, 51, 108, 109, 102, 119, 101, 117, 105, 50, 50, 121, 121, 105, 102, 50, 107, 117, 0, 0, 0, 0, 0>>
(ex_abi 0.5.11) lib/abi/type_decoder.ex:371: ABI.TypeDecoder.decode_uint/2
(ex_abi 0.5.11) lib/abi/type_decoder.ex:271: anonymous fn/3 in ABI.TypeDecoder.decode_type/2
(elixir 1.13.0) lib/enum.ex:2396: Enum."-reduce/3-lists^foldl/2-0-"/3
(ex_abi 0.5.11) lib/abi/type_decoder.ex:266: ABI.TypeDecoder.decode_type/2
(ex_abi 0.5.11) lib/abi/type_decoder.ex:311: ABI.TypeDecoder.decode_type/3
(ex_abi 0.5.11) lib/abi/type_decoder.ex:333: anonymous fn/3 in ABI.TypeDecoder.decode_type/3
(elixir 1.13.0) lib/enum.ex:2396: Enum."-reduce/3-lists^foldl/2-0-"/3
(ex_abi 0.5.11) lib/abi/type_decoder.ex:331: ABI.TypeDecoder.decode_type/3
(ex_abi 0.5.11) lib/abi/type_decoder.ex:188: anonymous fn/3 in ABI.TypeDecoder.do_decode_raw/2
(elixir 1.13.0) lib/enum.ex:2396: Enum."-reduce/3-lists^foldl/2-0-"/3
(ex_abi 0.5.11) lib/abi/type_decoder.ex:185: ABI.TypeDecoder.do_decode_raw/2
(ex_abi 0.5.11) lib/abi/type_decoder.ex:179: ABI.TypeDecoder.decode_raw/2The following lines I believe are the problem, as it wraps the output signature in a another set of parentheses.
output_types = Enum.map(abi[name]["outputs"], fn x -> x["type"] end)
types_signature = format_output_type_signatures(output_types)
output_signature = "#{name}(#{types_signature})"output_signature ends up being "foo((uint256[],string[]))" instead of "foo(uint256[],string[])". At least in this case when the types are uint256[] and string[], this raises an error.
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