parseLog not decoding event args with provided api

[viral-p]

Ethers Version

5.7.2

Search Terms

No response

Describe the Problem

with the provided ABI, parseLog output should include an args field that is an object containing the event args with named fields. Instead the output is an array, without names mapped to fields.

Code Snippet

const abi = [
  {
    anonymous: false,
    inputs: [
      {
        indexed: true,
        internalType: 'string',
        name: 'aggregatorId',
        type: 'string',
      },
      {
        indexed: true,
        internalType: 'address',
        name: 'sender',
        type: 'address',
      },
    ],
    name: 'Swap',
    type: 'event',
  },
];
const topics = [
  '0xbeee1e6e7fe307ddcf84b0a16137a4430ad5e2480fc4f4a8e250ab56ccd7630d',
  '0xa8dc30b66c6d4a8aac3d15925bfca09e42cac4a00c50f9949154b045088e2ac2',
  '0x000000000000000000000000df39cc227e0ab58f89d2b042a7b837a067945f3d',
];
const data = '0x';

const iface = new ethers.utils.Interface(abi);
const decodedLog = iface.parseLog({ topics, data });
console.log(decodedLog);

const logFragment = iface.getEvent(decodedLog.signature);
console.log(logFragment);

Contract ABI

[
  {
    anonymous: false,
    inputs: [
      {
        indexed: true,
        internalType: 'string',
        name: 'aggregatorId',
        type: 'string',
      },
      {
        indexed: true,
        internalType: 'address',
        name: 'sender',
        type: 'address',
      },
    ],
    name: 'Swap',
    type: 'event',
  },
]

Errors

No response

Environment

No response

Environment (Other)

No response

[ricmoo]

Have you tried console.log(logFragment.sender)? Keep in mind that the console.log cannot access dynamic values of a Proxy, but they are there. Its just a limitation of console.log and how Proxy objects work.

[ricmoo]

Oh sorry. Just noticed this is for v5. That did not use proxy, so they should be present. I will test this once I’m at a computer.

[viral-p]

looking at decodedLog.args
expected output

 {
    aggregatorId: '0xa8dc30b66c6d4a8aac3d15925bfca09e42cac4a00c50f9949154b045088e2ac2',
sender:  '0xDF39cc227E0aB58f89d2B042A7B837a067945F3d'
  }

what I get

  [
  {
    _isIndexed: true,
    hash: '0xa8dc30b66c6d4a8aac3d15925bfca09e42cac4a00c50f9949154b045088e2ac2',
    constructor: [Function: Indexed] { isIndexed: [Function (anonymous)] }
  },
  '0xDF39cc227E0aB58f89d2B042A7B837a067945F3d'
]

[maharshi365]

@ricmoo any updates on this issue? Found another example, Here is a minimal example

const abi = [
  {
    anonymous: false,
    inputs: [
      { indexed: true, internalType: 'string', name: 'hnId', type: 'string' },
      {
        indexed: true,
        internalType: 'address',
        name: 'wallet',
        type: 'address',
      },
    ],
    name: 'Mint',
    type: 'event',
  },
];

const topics = [
  '0x79b04a02d84fec4f53dec01c843dee92deee8a6d7dc31a65ae8c2c6b60200cf3',
  '0xfe9d5cae98771f5bbfd6b1674d82b20eb8b7fae8f2d30b5bfadeac20a861c545',
  '0x0000000000000000000000005c3d815a01e299a8475a9dcade5f75d96bdd07f5',
];

const data = '0x';

const iface = new ethers.utils.Interface(abi);

const parsed = iface.parseLog({ topics, data });

console.log('parsed', parsed);

The named parameters are present in the result of this.decodeEventLog(fragment, log.data, log.topics) but when the LogDescription object is created, the named parameters disappear. I think its somewhere in deep copy but cant localize

Interesting thing is that if i use the decodeEventLog function, the parameters are present

Using decodeEventLog

 [
  Indexed {
    _isIndexed: true,
    hash: '0xfe9d5cae98771f5bbfd6b1674d82b20eb8b7fae8f2d30b5bfadeac20a861c545'
  },
  '0x5c3d815a01E299A8475A9dcAde5f75d96BDd07F5',
  hnId: Indexed {
    _isIndexed: true,
    hash: '0xfe9d5cae98771f5bbfd6b1674d82b20eb8b7fae8f2d30b5bfadeac20a861c545'
  },
  wallet: '0x5c3d815a01E299A8475A9dcAde5f75d96BDd07F5'
]
}

Using parseLog

LogDescription {
  eventFragment: {
    name: 'Mint',
    anonymous: false,
    inputs: [ [ParamType], [ParamType] ],
    type: 'event',
    _isFragment: true,
    constructor: [Function: EventFragment] {
      from: [Function (anonymous)],
      fromObject: [Function (anonymous)],
      fromString: [Function (anonymous)],
      isEventFragment: [Function (anonymous)]
    },
    format: [Function (anonymous)]
  },
  name: 'Mint',
  signature: 'Mint(string,address)',
  topic: '0x79b04a02d84fec4f53dec01c843dee92deee8a6d7dc31a65ae8c2c6b60200cf3',
  args: [
    {
      _isIndexed: true,
      hash: '0xfe9d5cae98771f5bbfd6b1674d82b20eb8b7fae8f2d30b5bfadeac20a861c545',
      constructor: [Function]
    },
    '0x5c3d815a01E299A8475A9dcAde5f75d96BDd07F5'
  ]
}