Instadapp/smart-contract
1
0
Fork 0
mirror of https://github.com/Instadapp/smart-contract.git synced 2024-07-29 22:08:07 +00:00
Code Issues Packages Projects Releases Wiki Activity

MKR fee contract

Browse Source
This commit is contained in:
Samyak Jain 2019-11-19 03:08:54 +05:30
parent a3854850de
commit fdb675bb6a
1 changed files with 103 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

103
contracts/Read/InstaCdpFee.sol Normal file
View File

@ -0,0 +1,103 @@
pragma solidity ^0.5.0;
interface TubInterface {
function tab(bytes32) external view returns (uint);
function rap(bytes32) external view returns (uint);
function pep() external view returns (PepInterface);
function cups(bytes32) external view returns (address, uint, uint, uint);
}
interface PepInterface {
function peek() external view returns (bytes32, bool);
}
interface InstaMcdAddress {
function dai() external view returns (address);
function gov() external view returns (address);
function saiTub() external view returns (address);
function weth() external view returns (address);
function sai() external view returns (address);
}
interface UniswapExchange {
function getEthToTokenOutputPrice(uint256 tokensBought) external view returns (uint256 ethSold);
function getTokenToEthOutputPrice(uint256 ethBought) external view returns (uint256 tokensSold);
}
interface UniswapFactoryInterface {
function getExchange(address token) external view returns (address exchange);
}
interface OtcInterface {
function getPayAmount(address, address, uint) external view returns (uint);
}
contract DSMath {
function add(uint x, uint y) internal pure returns (uint z) {
require((z = x + y) >= x, "math-not-safe");
}
function mul(uint x, uint y) internal pure returns (uint z) {
require(y == 0 || (z = x * y) / y == x, "math-not-safe");
}
uint constant WAD = 10 ** 18;
// uint constant RAY = 10 ** 27;
// function rmul(uint x, uint y) internal pure returns (uint z) {
// z = add(mul(x, y), RAY / 2) / RAY;
// }
// function rdiv(uint x, uint y) internal pure returns (uint z) {
// z = add(mul(x, RAY), y / 2) / y;
// }
function wdiv(uint x, uint y) internal pure returns (uint z) {
z = add(mul(x, WAD), y / 2) / y;
}
}
contract CdpFee is DSMath {
address public instaMcdAddress = 0x5092b94F61b1aa54969C67b58695a6fB15D70645;
address public otcAddr = 0x39755357759cE0d7f32dC8dC45414CCa409AE24e;
address public ethAddr = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
address public uniMkrEx = 0x2C4Bd064b998838076fa341A83d007FC2FA50957;
address public uniFactory = 0xc0a47dFe034B400B47bDaD5FecDa2621de6c4d95;
address public peekAddr = 0x5C1fc813d9c1B5ebb93889B3d63bA24984CA44B7;
address public mkr = 0x9f8F72aA9304c8B593d555F12eF6589cC3A579A2;
address public weth = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
function getMkrRate() public view returns (uint mkrInUsd) {
(bytes32 val,) = PepInterface(peekAddr).peek();
mkrInUsd = uint(val);
}
function getBestMkrSwap(address srcTknAddr, uint destMkrAmt) public view returns(uint bestEx, uint srcAmt) {
uint oasisPrice = getOasisSwap(srcTknAddr, destMkrAmt);
uint uniswapPrice = getUniswapSwap(srcTknAddr, destMkrAmt);
srcAmt = oasisPrice < uniswapPrice ? oasisPrice : uniswapPrice;
bestEx = oasisPrice < uniswapPrice ? 0 : 1; // if 0 then use Oasis for Swap, if 1 then use Uniswap
}
function getOasisSwap(address tokenAddr, uint destMkrAmt) public view returns(uint srcAmt) {
address srcTknAddr = tokenAddr == ethAddr ? weth : tokenAddr;
srcAmt = OtcInterface(otcAddr).getPayAmount(srcTknAddr, mkr, destMkrAmt);
}
function getUniswapSwap(address srcTknAddr, uint destMkrAmt) public view returns(uint srcAmt) {
UniswapExchange mkrEx = UniswapExchange(uniMkrEx);
if (srcTknAddr == ethAddr) {
srcAmt = mkrEx.getEthToTokenOutputPrice(destMkrAmt);
} else {
address buyTknExAddr = UniswapFactoryInterface(uniFactory).getExchange(srcTknAddr);
UniswapExchange buyTknEx = UniswapExchange(buyTknExAddr);
srcAmt = buyTknEx.getTokenToEthOutputPrice(mkrEx.getEthToTokenOutputPrice(destMkrAmt)); //Check thrilok is this correct
}
}
}