mirror of
https://github.com/Instadapp/smart-contract.git
synced 2024-07-29 22:08:07 +00:00
546 lines
16 KiB
Solidity
546 lines
16 KiB
Solidity
pragma solidity ^0.5.0;
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interface TubInterface {
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function open() external returns (bytes32);
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function join(uint) external;
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function exit(uint) external;
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function lock(bytes32, uint) external;
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function free(bytes32, uint) external;
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function draw(bytes32, uint) external;
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function wipe(bytes32, uint) external;
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function give(bytes32, address) external;
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function shut(bytes32) external;
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function cups(bytes32) external view returns (address, uint, uint, uint);
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function gem() external view returns (TokenInterface);
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function gov() external view returns (TokenInterface);
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function skr() external view returns (TokenInterface);
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function sai() external view returns (TokenInterface);
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function ink(bytes32) external view returns (uint);
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function tab(bytes32) external returns (uint);
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function rap(bytes32) external returns (uint);
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function per() external view returns (uint);
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function pep() external view returns (PepInterface);
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}
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interface PepInterface {
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function peek() external returns (bytes32, bool);
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}
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interface oracleInterface {
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function read() external view returns (bytes32);
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}
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interface UniswapExchange {
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function getEthToTokenOutputPrice(uint256 tokensBought) external view returns (uint256 ethSold);
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function getTokenToEthOutputPrice(uint256 ethBought) external view returns (uint256 tokensSold);
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function tokenToTokenSwapOutput(
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uint256 tokensBought,
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uint256 maxTokensSold,
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uint256 maxEthSold,
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uint256 deadline,
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address tokenAddr
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) external returns (uint256 tokensSold);
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}
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interface TokenInterface {
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function allowance(address, address) external view returns (uint);
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function balanceOf(address) external view returns (uint);
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function approve(address, uint) external;
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function transfer(address, uint) external returns (bool);
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function transferFrom(address, address, uint) external returns (bool);
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function deposit() external payable;
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function withdraw(uint) external;
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}
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interface KyberInterface {
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function trade(
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address src,
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uint srcAmount,
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address dest,
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address destAddress,
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uint maxDestAmount,
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uint minConversionRate,
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address walletId
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) external payable returns (uint);
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function getExpectedRate(
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address src,
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address dest,
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uint srcQty
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) external view returns (uint, uint);
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}
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interface SplitSwapInterface {
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function getBest(address src, address dest, uint srcAmt) external view returns (uint bestExchange, uint destAmt);
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function ethToDaiSwap(uint splitAmt, uint slippageAmt) external payable returns (uint destAmt);
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function daiToEthSwap(uint srcAmt, uint splitAmt, uint slippageAmt) external returns (uint destAmt);
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}
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contract DSMath {
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function add(uint x, uint y) internal pure returns (uint z) {
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require((z = x + y) >= x, "math-not-safe");
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}
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function sub(uint x, uint y) internal pure returns (uint z) {
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require((z = x - y) <= x, "ds-math-sub-underflow");
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}
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function mul(uint x, uint y) internal pure returns (uint z) {
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require(y == 0 || (z = x * y) / y == x, "math-not-safe");
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}
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uint constant WAD = 10 ** 18;
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uint constant RAY = 10 ** 27;
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function rmul(uint x, uint y) internal pure returns (uint z) {
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z = add(mul(x, y), RAY / 2) / RAY;
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}
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function rdiv(uint x, uint y) internal pure returns (uint z) {
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z = add(mul(x, RAY), y / 2) / y;
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}
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function wmul(uint x, uint y) internal pure returns (uint z) {
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z = add(mul(x, y), WAD / 2) / WAD;
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}
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function wdiv(uint x, uint y) internal pure returns (uint z) {
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z = add(mul(x, WAD), y / 2) / y;
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}
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}
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contract Helpers is DSMath {
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/**
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* @dev get MakerDAO CDP engine
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*/
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function getSaiTubAddress() public pure returns (address sai) {
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sai = 0x448a5065aeBB8E423F0896E6c5D525C040f59af3;
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}
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/**
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* @dev get MakerDAO Oracle for ETH price
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*/
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function getOracleAddress() public pure returns (address oracle) {
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oracle = 0x729D19f657BD0614b4985Cf1D82531c67569197B;
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}
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/**
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* @dev get uniswap MKR exchange
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*/
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function getUniswapMKRExchange() public pure returns (address ume) {
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ume = 0x2C4Bd064b998838076fa341A83d007FC2FA50957;
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}
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/**
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* @dev get uniswap DAI exchange
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*/
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function getUniswapDAIExchange() public pure returns (address ude) {
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ude = 0x09cabEC1eAd1c0Ba254B09efb3EE13841712bE14;
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}
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/**
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* @dev get ethereum address for trade
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*/
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function getAddressETH() public pure returns (address eth) {
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eth = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
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}
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/**
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* @dev get dai address for trade
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*/
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function getAddressDAI() public pure returns (address dai) {
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dai = 0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359;
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}
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/**
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* @dev get kyber proxy address
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*/
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function getAddressKyber() public pure returns (address kyber) {
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kyber = 0x818E6FECD516Ecc3849DAf6845e3EC868087B755;
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}
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/**
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* @dev get admin address
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*/
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function getAddressSplitSwap() public pure returns (address payable splitSwap) {
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splitSwap = 0xa4BCA645f9cB9e6F9ad8C56D90a65b07C2f4e1Dd;
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}
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/**
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* @dev get admin address
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*/
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function getAddressAdmin() public pure returns (address payable admin) {
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admin = 0x7284a8451d9a0e7Dc62B3a71C0593eA2eC5c5638;
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}
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function getCDPStats(bytes32 cup) internal view returns (uint ethCol, uint daiDebt, uint usdPerEth) {
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TubInterface tub = TubInterface(getSaiTubAddress());
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usdPerEth = uint(oracleInterface(getOracleAddress()).read());
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(, uint pethCol, uint debt,) = tub.cups(cup);
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ethCol = rmul(pethCol, tub.per()); // get ETH col from PETH col
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daiDebt = debt;
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}
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}
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contract MakerHelpers is Helpers {
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event LogLock(uint cdpNum, uint amtETH, uint amtPETH, address owner);
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event LogFree(uint cdpNum, uint amtETH, uint amtPETH, address owner);
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event LogDraw(uint cdpNum, uint amtDAI, address owner);
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event LogWipe(uint cdpNum, uint daiAmt, uint mkrFee, uint daiFee, address owner);
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function setAllowance(TokenInterface _token, address _spender) internal {
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if (_token.allowance(address(this), _spender) != uint(-1)) {
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_token.approve(_spender, uint(-1));
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}
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}
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function lock(uint cdpNum, uint ethAmt) internal {
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if (ethAmt > 0) {
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bytes32 cup = bytes32(cdpNum);
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address tubAddr = getSaiTubAddress();
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TubInterface tub = TubInterface(tubAddr);
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TokenInterface weth = tub.gem();
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TokenInterface peth = tub.skr();
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(address lad,,,) = tub.cups(cup);
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require(lad == address(this), "cup-not-owned");
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weth.deposit.value(ethAmt)();
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uint ink = rdiv(ethAmt, tub.per());
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ink = rmul(ink, tub.per()) <= ethAmt ? ink : ink - 1;
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setAllowance(weth, tubAddr);
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tub.join(ink);
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setAllowance(peth, tubAddr);
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tub.lock(cup, ink);
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emit LogLock(
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cdpNum,
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ethAmt,
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ink,
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address(this)
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);
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}
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}
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function free(uint cdpNum, uint jam) internal {
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if (jam > 0) {
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bytes32 cup = bytes32(cdpNum);
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address tubAddr = getSaiTubAddress();
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TubInterface tub = TubInterface(tubAddr);
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TokenInterface peth = tub.skr();
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TokenInterface weth = tub.gem();
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uint ink = rdiv(jam, tub.per());
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ink = rmul(ink, tub.per()) <= jam ? ink : ink - 1;
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tub.free(cup, ink);
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setAllowance(peth, tubAddr);
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tub.exit(ink);
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uint freeJam = weth.balanceOf(address(this)); // withdraw possible previous stuck WETH as well
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weth.withdraw(freeJam);
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emit LogFree(
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cdpNum,
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freeJam,
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ink,
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address(this)
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);
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}
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}
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function draw(uint cdpNum, uint _wad) internal {
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bytes32 cup = bytes32(cdpNum);
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if (_wad > 0) {
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TubInterface tub = TubInterface(getSaiTubAddress());
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tub.draw(cup, _wad);
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emit LogDraw(cdpNum, _wad, address(this));
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}
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}
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function wipe(uint cdpNum, uint _wad) internal {
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if (_wad > 0) {
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TubInterface tub = TubInterface(getSaiTubAddress());
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UniswapExchange daiEx = UniswapExchange(getUniswapDAIExchange());
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UniswapExchange mkrEx = UniswapExchange(getUniswapMKRExchange());
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TokenInterface dai = tub.sai();
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TokenInterface mkr = tub.gov();
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bytes32 cup = bytes32(cdpNum);
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(address lad,,,) = tub.cups(cup);
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require(lad == address(this), "cup-not-owned");
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setAllowance(dai, getSaiTubAddress());
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setAllowance(mkr, getSaiTubAddress());
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setAllowance(dai, getUniswapDAIExchange());
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(bytes32 val, bool ok) = tub.pep().peek();
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// tub.rap(cup) = stability fee in $, tub.tab(cup) = total DAI debt
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uint mkrFee = wdiv(rmul(_wad, rdiv(tub.rap(cup), tub.tab(cup))), uint(val));
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// uint mkrFee = wdiv(rmul(_wad, rdiv(tub.rap(cup), add(tub.rap(cup), tub.tab(cup)))), uint(val));
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uint daiFeeAmt = daiEx.getTokenToEthOutputPrice(mkrEx.getEthToTokenOutputPrice(mkrFee));
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uint daiAmt = sub(_wad, daiFeeAmt);
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if (ok && val != 0) {
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daiEx.tokenToTokenSwapOutput(
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mkrFee,
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daiFeeAmt,
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uint(999000000000000000000),
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uint(1899063809), // 6th March 2030 GMT // no logic
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address(mkr)
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);
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}
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tub.wipe(cup, daiAmt);
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emit LogWipe(
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cdpNum,
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_wad,
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mkrFee,
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daiFeeAmt,
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address(this)
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);
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}
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}
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}
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contract GetDetails is MakerHelpers {
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function getMax(uint cdpID) public view returns (uint maxColToFree, uint maxDaiToDraw, uint ethInUSD) {
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bytes32 cup = bytes32(cdpID);
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(uint ethCol, uint daiDebt, uint usdPerEth) = getCDPStats(cup);
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uint colToUSD = sub(wmul(ethCol, usdPerEth), 10);
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uint minColNeeded = add(wmul(daiDebt, 1500000000000000000), 10);
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maxColToFree = wdiv(sub(colToUSD, minColNeeded), usdPerEth);
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uint maxDebtLimit = sub(wdiv(colToUSD, 1500000000000000000), 10);
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maxDaiToDraw = sub(maxDebtLimit, daiDebt);
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ethInUSD = usdPerEth;
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}
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function getSave(uint cdpID, uint ethToSwap) public view returns (uint finalEthCol, uint finalDaiDebt, uint finalColToUSD, bool canSave) {
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bytes32 cup = bytes32(cdpID);
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(uint ethCol, uint daiDebt, uint usdPerEth) = getCDPStats(cup);
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(finalEthCol, finalDaiDebt, finalColToUSD, canSave) = checkSave(
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ethCol,
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daiDebt,
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usdPerEth,
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ethToSwap
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);
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}
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function getLeverage(
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uint cdpID,
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uint daiToSwap
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) public view returns (
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uint finalEthCol,
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uint finalDaiDebt,
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uint finalColToUSD,
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bool canLeverage
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)
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{
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bytes32 cup = bytes32(cdpID);
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(uint ethCol, uint daiDebt, uint usdPerEth) = getCDPStats(cup);
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(finalEthCol, finalDaiDebt, finalColToUSD, canLeverage) = checkLeverage(
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ethCol,
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daiDebt,
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usdPerEth,
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daiToSwap
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);
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}
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function checkSave(
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uint ethCol,
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uint daiDebt,
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uint usdPerEth,
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uint ethToSwap
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) internal view returns
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(
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uint finalEthCol,
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uint finalDaiDebt,
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uint finalColToUSD,
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bool canSave
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)
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{
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uint colToUSD = sub(wmul(ethCol, usdPerEth), 10);
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uint minColNeeded = add(wmul(daiDebt, 1500000000000000000), 10);
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uint colToFree = wdiv(sub(colToUSD, minColNeeded), usdPerEth);
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if (ethToSwap < colToFree) {
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colToFree = ethToSwap;
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}
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(, uint expectedDAI) = SplitSwapInterface(getAddressSplitSwap()).getBest(getAddressETH(), getAddressDAI(), colToFree);
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if (expectedDAI < daiDebt) {
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finalEthCol = sub(ethCol, colToFree);
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finalDaiDebt = sub(daiDebt, expectedDAI);
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finalColToUSD = wmul(finalEthCol, usdPerEth);
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canSave = true;
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} else {
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finalEthCol = 0;
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finalDaiDebt = 0;
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finalColToUSD = 0;
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canSave = false;
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}
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}
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function checkLeverage(
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uint ethCol,
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uint daiDebt,
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uint usdPerEth,
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uint daiToSwap
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) internal view returns
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(
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uint finalEthCol,
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uint finalDaiDebt,
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uint finalColToUSD,
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bool canLeverage
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)
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{
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uint colToUSD = sub(wmul(ethCol, usdPerEth), 10);
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uint maxDebtLimit = sub(wdiv(colToUSD, 1500000000000000000), 10);
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uint debtToBorrow = sub(maxDebtLimit, daiDebt);
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if (daiToSwap < debtToBorrow) {
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debtToBorrow = daiToSwap;
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}
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(, uint expectedETH) = SplitSwapInterface(getAddressSplitSwap()).getBest(getAddressDAI(), getAddressETH(), debtToBorrow);
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if (ethCol != 0) {
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finalEthCol = add(ethCol, expectedETH);
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finalDaiDebt = add(daiDebt, debtToBorrow);
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finalColToUSD = wmul(finalEthCol, usdPerEth);
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canLeverage = true;
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} else {
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finalEthCol = 0;
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finalDaiDebt = 0;
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finalColToUSD = 0;
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canLeverage = false;
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}
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}
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}
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contract Save is GetDetails {
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/**
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* @param what 2 for SAVE & 3 for LEVERAGE
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*/
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event LogTrade(
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uint what, // 0 for BUY & 1 for SELL
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address src,
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uint srcAmt,
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address dest,
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uint destAmt,
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address beneficiary,
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uint minConversionRate,
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address affiliate
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);
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event LogSaveCDP(
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uint cdpID,
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uint srcETH,
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uint destDAI
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);
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event LogLeverageCDP(
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uint cdpID,
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uint srcDAI,
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uint destETH
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);
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function save(
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uint cdpID,
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uint colToSwap,
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uint splitAmt,
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uint slippageAmt
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) public
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{
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bytes32 cup = bytes32(cdpID);
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(uint ethCol, uint daiDebt, uint usdPerEth) = getCDPStats(cup);
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uint colToFree = getColToFree(ethCol, daiDebt, usdPerEth);
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require(colToFree != 0, "no-collatral-to-free");
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if (colToSwap < colToFree) {
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colToFree = colToSwap;
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}
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free(cdpID, colToFree);
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uint ethToSwap = address(this).balance;
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ethToSwap = ethToSwap < colToFree ? ethToSwap : colToFree;
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uint destAmt = SplitSwapInterface(getAddressSplitSwap()).ethToDaiSwap.value(ethToSwap)(splitAmt, slippageAmt);
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wipe(cdpID, destAmt);
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emit LogSaveCDP(cdpID, ethToSwap, destAmt);
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}
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function leverage(
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uint cdpID,
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uint daiToSwap,
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uint splitAmt,
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uint slippageAmt
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) public
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{
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bytes32 cup = bytes32(cdpID);
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(uint ethCol, uint daiDebt, uint usdPerEth) = getCDPStats(cup);
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uint debtToBorrow = getDebtToBorrow(ethCol, daiDebt, usdPerEth);
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require(debtToBorrow != 0, "No-debt-to-borrow");
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if (daiToSwap < debtToBorrow) {
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debtToBorrow = daiToSwap;
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}
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draw(cdpID, debtToBorrow);
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setAllowance(TokenInterface(getAddressDAI()), getAddressSplitSwap());
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uint destAmt = SplitSwapInterface(getAddressSplitSwap()).daiToEthSwap(debtToBorrow, splitAmt, slippageAmt);
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lock(cdpID, destAmt);
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emit LogLeverageCDP(cdpID, debtToBorrow, destAmt);
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}
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function getColToFree(uint ethCol, uint daiDebt, uint usdPerEth) internal pure returns (uint colToFree) {
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uint colToUSD = sub(wmul(ethCol, usdPerEth), 10);
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|
uint minColNeeded = add(wmul(daiDebt, 1500000000000000000), 10);
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|
colToFree = sub(wdiv(sub(colToUSD, minColNeeded), usdPerEth), 10);
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|
}
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|
|
|
function getDebtToBorrow(uint ethCol, uint daiDebt, uint usdPerEth) internal pure returns (uint debtToBorrow) {
|
|
uint colToUSD = sub(wmul(ethCol, usdPerEth), 10);
|
|
uint maxDebtLimit = sub(wdiv(colToUSD, 1500000000000000000), 10);
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|
debtToBorrow = sub(maxDebtLimit, daiDebt);
|
|
}
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|
|
|
}
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|
|
|
|
contract InstaSave is Save {
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|
|
|
uint public version;
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|
|
|
/**
|
|
* @dev setting up variables on deployment
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|
* 1...2...3 versioning in each subsequent deployments
|
|
*/
|
|
constructor(uint _version) public {
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|
version = _version;
|
|
}
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|
|
|
function() external payable {}
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|
|
|
} |