Failed to decode CBOR (Failed to parse, Undeterminated nesting)

[pu0238]

Describe the bug
I am using "@dfinity/agent": "^2.4.0" and sometimes, while doing communication with the IC mainnet, I receive errors like: Failed to parse, Undetermined nesting — even though the whole transaction was fine. I rely heavily on those responses, so it's messing up the flow of the app and may cause serious issues in my application.

After sending a transaction and once it is computed, I receive an error, even though the full response can be successfully decoded using any CBOR tool (e.g., https://cbor.me/):

Failed to decode CBOR: Error: Failed to parse, input: 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and

Failed to decode CBOR: Error: Undeterminated nesting, input: 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It seems like the issue is in the borc library (used here: agent-js cbor.ts), specifically in the decode function (decoder.js line 547).
This is a well-known issue that is still not fixed: https://github.com/dignifiedquire/borc/issues/40

BTW, here is the corresponding Candid typing for this function (generated by candid-extractor from the Rust file):

'erc20_transfer': IDL.Func([IDL.Principal, IDL.Nat], [Result_2], []),

const Result_2 = IDL.Variant({
  'Ok': IDL.Null,
  'Err': TransferErc20Error
});

const TransferErc20Error = IDL.Variant({
  'CallerNotFound': IDL.Principal,
  'RecipientNotFound': IDL.Text,
  'InsufficientFunds': IDL.Record({
    'available': IDL.Nat,
    'required': IDL.Nat,
  }),
});

[marc0olo]

Hey @pu0238,

thanks for reporting the issue!

We are aware of the problems with borc and removing it is a Q2 priority. The team will evaluate whether cbor2 meets our needs, or whether a custom library is more appropriate.

[ilbertt]

The team will evaluate whether cbor2 meets our needs, or whether a custom library is more appropriate.

FYI, we are moving on with our new @dfinity/cbor library. See #1015.

[ilbertt]

@pu0238 can you confirm that this is the expected output of the decoded payload?

[pu0238]

The provided hex is identical to the one returned by the error

[ilbertt]

@pu0238 what about the deserialized data instead? See https://github.com/dfinity/agent-js/blob/a61ff980bdcf5d9af4f7e03199811dc8aca538d0/packages/agent/src/snapshots/cbor.test.ts.snap

[ilbertt]

@pu0238 feel free to re-open it if needed.