Whats the recommended way to handle/decode errors from cross contract calls?

[oveddan]

Given you have a contract that calls another contract, sometimes the other contract reverts with a custom error. However, the calling contract does not have that error in it's abi, so viem cannot decode that error result.

Example:

contract CalleeContract {
    error Oops();

    function callMe() external {
        revert Oops();
    }
}

contract CallingContract {
    CalleeContract calleeContract;

    constructor() {
        calleeContract = new CalleeContract();
    }

    function callCalle() external {
        calleeContract.callMe();
    }
}

What's the recommend approach to be able to decode errors from the CalleeContract when calling it from the CallerContract using viem?

[dsimmons]

Also seeing this, would love to know the best way to handle it! 🙂

[junkim012]

Curious if you found a viem native solution for this problem?

The two things I do right now is either 1. move all custom errors to a single contract and inherit it such that all of the possible errors show up on the calling contracts' ABI. 2. Iterate through all possible ABI's with viem's decodeErrorResult until it finds the valid ABI with the custom error that was thrown.

[maguroid]

+1