Calling a function with calldata parameter from another contract

Question

Contact A:

function redeemAssetsForBuyback(address[] calldata tokens) external {
  // ...
}

I would like to call redeemAssetsForBuyback from Contract B:

function initiateRedeem() external {
  // ...
  // I have address[] memory payload ready to be sent
  address[] memory myPayload;

  // Can I transform myPayload to address[] calldata?
  IContractA(contractAAdrress).redeemAssetsForBuyback(myPayload); // Parameter mismatchs
}

I can change the redeemAssetsForBuyback function's parameter to be memory instead of calldata and my issue resolves on JS VM at Remix but I read that I should be using calldata here.

So, can I somehow create a address[] calldata on ContractB and call ContractA's function with it? If not, is it okay to use redeemAssetsForBuyback(address[] memory tokens)?

Answer 1

This is one way to do so:

pragma solidity ^0.8.0;

contract A {
    event Received(bytes);
    
    function redeemAssetsForBuyback(address[] calldata) external{
      emit Received(msg.data);
    }      
}

contract B{
    function initiateRedeem(address _contractA, address[] calldata address_array) external {
        
        (bool success, ) = _contractA.call(
            abi.encodeWithSignature("redeemAssetsForBuyback(address[])", address_array)
        );
        
        require(success);
    }
}

If you deploy ContractA and pass the address of ContractA to initiateRedeem() in ContractB along with your array of address, it will make an call to redeemAssetsForBuyback function in contractA.