Ether2DAI.sol

// SPDX-License-Identifier: MIT
pragma solidity =0.7.4;


import "LibSafeMath.sol";
import "LibIEtherUSDPrice.sol";


interface IUniswapV2Router02 {
    function WETH() external pure returns (address);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
}

contract Ether2DAI is IEtherUSDPrice {
    using SafeMath for uint256;

    IUniswapV2Router02 private immutable UniswapV2Router02 = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);

    address private _token = address(0x6B175474E89094C44Da98b954EedeAC495271d0F);  // DAI mainnet

    function etherUSDPrice()
        public
        override
        view
        returns (uint256)
    {
        return UniswapV2Router02.getAmountsOut(1 ether, _path())[1].mul(1_000_000).div(1 ether);
    }

    function _path()
        private
        view
        returns (address[] memory)
    {
        address[] memory path = new address[](2);
        path[0] = UniswapV2Router02.WETH();
        path[1] = _token;

        return path;
    }
}