// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity >=0.5.12;

// https://github.com/makerdao/dss-chain-log
interface ChainlogAbstract {
    function wards(address) external view returns (uint256);
    function rely(address) external;
    function deny(address) external;
    function keys() external view returns (bytes32[] memory);
    function version() external view returns (string memory);
    function ipfs() external view returns (string memory);
    function setVersion(string calldata) external;
    function setSha256sum(string calldata) external;
    function setIPFS(string calldata) external;
    function setAddress(bytes32,address) external;
    function removeAddress(bytes32) external;
    function count() external view returns (uint256);
    function get(uint256) external view returns (bytes32,address);
    function list() external view returns (bytes32[] memory);
    function getAddress(bytes32) external view returns (address);
}

// Helper function for returning address or abstract of Chainlog
//  Valid on Mainnet, Kovan, Rinkeby, Ropsten, and Goerli
contract ChainlogHelper {
    address          public constant ADDRESS  = 0xdA0Ab1e0017DEbCd72Be8599041a2aa3bA7e740F;
    ChainlogAbstract public constant ABSTRACT = ChainlogAbstract(ADDRESS);
}