calling methods with "tuple" type return gives error

[vibern0]

I'm trying to get data for an EAS attestation, but i can't because the result is a tuple and it's giving error.

The ABI

{
"inputs": [{ "internalType": "bytes32", "name": "uid", "type": "bytes32" }],
"name": "getAttestation",
"outputs": [
    {
    "components": [
        { "internalType": "bytes32", "name": "uid", "type": "bytes32" },
        { "internalType": "bytes32", "name": "schema", "type": "bytes32" },
        { "internalType": "uint64", "name": "time", "type": "uint64" },
        { "internalType": "uint64", "name": "expirationTime", "type": "uint64" },
        { "internalType": "uint64", "name": "revocationTime", "type": "uint64" },
        { "internalType": "bytes32", "name": "refUID", "type": "bytes32" },
        { "internalType": "address", "name": "recipient", "type": "address" },
        { "internalType": "address", "name": "attester", "type": "address" },
        { "internalType": "bool", "name": "revocable", "type": "bool" },
        { "internalType": "bytes", "name": "data", "type": "bytes" }
    ],
    "internalType": "struct Attestation",
    "name": "",
    "type": "tuple"
    }
],
"stateMutability": "view",
"type": "function"
}

the error

NoMethodError: undefined method `none?` for nil:NilClass

          elsif base_type == "tuple" && components.none?(&:dynamic?)
                                                  ^^^^^^
from ~/.rbenv/versions/3.1.5/lib/ruby/gems/3.1.0/gems/eth-0.5.11/lib/eth/abi/type.rb:118:in `size'

[q9f]

Can you give me an address or test data that makes this fail?

Can you confirm this also happens with latest main branch? Just clone the repository, run bin/console and create your client / contract there.

[bshyong]

@q9f I see this happening too; I think it's because in the ABI file, the components are nested.

Here's an example.

Eth::Contract.from_abi using the ABI below

and calling contract with address "0xbb505c54d71e9e599cb8435b4f0ceec05fc71cbd" on Base.

eg. client.call(contract_instance, "getReserveStatus", [64]

client.call_raw which is ultimately is called gets types like this types = func.outputs.map { |i| i.type }

but from the ABI, func.outputs is an array with a single hash [ { components: "" } ]

https://github.com/q9f/eth.rb/blob/4182fa7993a9a6c6648e065dcf6748fb8d738895/lib/eth/client.rb#L455

  {
    "inputs": [
      {
        "internalType": "uint256[]",
        "name": "reserveIdArr",
        "type": "uint256[]"
      }
    ],
    "name": "getReserveStatus",
    "outputs": [
      {
        "components": [
          {
            "internalType": "uint256",
            "name": "reserveId",
            "type": "uint256"
          },
          {
            "internalType": "address",
            "name": "underlyingTokenAddress",
            "type": "address"
          },
          {
            "internalType": "address",
            "name": "eTokenAddress",
            "type": "address"
          },
          {
            "internalType": "address",
            "name": "stakingAddress",
            "type": "address"
          },
          {
            "internalType": "uint256",
            "name": "totalLiquidity",
            "type": "uint256"
          },
          {
            "internalType": "uint256",
            "name": "totalBorrows",
            "type": "uint256"
          },
          {
            "internalType": "uint256",
            "name": "exchangeRate",
            "type": "uint256"
          },
          {
            "internalType": "uint256",
            "name": "borrowingRate",
            "type": "uint256"
          }
        ],
        "internalType": "struct ILendingPool.ReserveStatus[]",
        "name": "statusArr",
        "type": "tuple[]"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  }

[q9f]

Thank you. I used this ABI to ensure the Abi::Type parser works correctly, it has all types, names, and components correctly.

# name
"statusArr"
# type
<Eth::Abi::Type:0x000062dd59c2e4f0 @base_type="tuple", @dimensions=[0], @name=nil, @sub_type="">
# data
{"components"=>
  [{"internalType"=>"uint256", "name"=>"reserveId", "type"=>"uint256"},
   {"internalType"=>"address", "name"=>"underlyingTokenAddress", "type"=>"address"},
   {"internalType"=>"address", "name"=>"eTokenAddress", "type"=>"address"},
   {"internalType"=>"address", "name"=>"stakingAddress", "type"=>"address"},
   {"internalType"=>"uint256", "name"=>"totalLiquidity", "type"=>"uint256"},
   {"internalType"=>"uint256", "name"=>"totalBorrows", "type"=>"uint256"},
   {"internalType"=>"uint256", "name"=>"exchangeRate", "type"=>"uint256"},
   {"internalType"=>"uint256", "name"=>"borrowingRate", "type"=>"uint256"}],
 "internalType"=>"struct ILendingPool.ReserveStatus[]",
 "name"=>"statusArr",
 "type"=>"tuple[]"}

The problem is that while decoding the result, the type somewhere loses the components, thus the error. I suspect that a recent bug fix did not cover all cases. I just need to find out where it fails.

So, good news (for me) is the module works correctly, it just is not invoked correctly (in a yet unknown location).

I'm sorry if this takes a bit as this specific code was added by a contributor and I'm still getting warm with the mechanics.