WithdrawerExitBus-basic.sol

contract WithdrawerExitBus is IBeaconChainMessageBus {
    uint256 constant WITHDRAWER_EXIT_TYPE = 0x00;

    struct WithdrawerExit {
        address withdrawalAddress;  // address corresponding to the 0x01 withdrawal creds
        uint256 validatorIndex; // caller is responsible to get it from validator pubkey
    }

    function initiateValidatorExit(uint256 _validatorIndex) external {
        // optionally require msg.value > some value and lock it on the contract
        WithdrawerExit memory withdrawerExit = WithdrawerExit(msg.sender, _validatorIndex);
        bytes memory encodedData = abi.encode(withdrawerExit);
        emit MessageEvent(Message(WITHDRAWER_EXIT_TYPE, encodedData));
    }
}