mirror of
https://github.com/Instadapp/smart-contract.git
synced 2024-07-29 22:08:07 +00:00
276 lines
8.1 KiB
Solidity
276 lines
8.1 KiB
Solidity
pragma solidity ^0.5.0;
|
|
|
|
interface TubInterface {
|
|
function open() external returns (bytes32);
|
|
function join(uint) external;
|
|
function exit(uint) external;
|
|
function lock(bytes32, uint) external;
|
|
function free(bytes32, uint) external;
|
|
function draw(bytes32, uint) external;
|
|
function wipe(bytes32, uint) external;
|
|
function give(bytes32, address) external;
|
|
function shut(bytes32) external;
|
|
function cups(bytes32) external view returns (address, uint, uint, uint);
|
|
function gem() external view returns (TokenInterface);
|
|
function gov() external view returns (TokenInterface);
|
|
function skr() external view returns (TokenInterface);
|
|
function sai() external view returns (TokenInterface);
|
|
function ink(bytes32) external view returns (uint);
|
|
function tab(bytes32) external returns (uint);
|
|
function rap(bytes32) external returns (uint);
|
|
function per() external view returns (uint);
|
|
function pep() external view returns (PepInterface);
|
|
}
|
|
|
|
interface TokenInterface {
|
|
function allowance(address, address) external view returns (uint);
|
|
function balanceOf(address) external view returns (uint);
|
|
function approve(address, uint) external;
|
|
function transfer(address, uint) external returns (bool);
|
|
function transferFrom(address, address, uint) external returns (bool);
|
|
function deposit() external payable;
|
|
function withdraw(uint) external;
|
|
}
|
|
|
|
interface PepInterface {
|
|
function peek() external returns (bytes32, bool);
|
|
}
|
|
|
|
interface UniswapExchange {
|
|
function getEthToTokenOutputPrice(uint256 tokensBought) external view returns (uint256 ethSold);
|
|
function getTokenToEthOutputPrice(uint256 ethBought) external view returns (uint256 tokensSold);
|
|
function tokenToTokenSwapOutput(
|
|
uint256 tokensBought,
|
|
uint256 maxTokensSold,
|
|
uint256 maxEthSold,
|
|
uint256 deadline,
|
|
address tokenAddr
|
|
) external returns (uint256 tokensSold);
|
|
}
|
|
|
|
|
|
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 Helpers is DSMath {
|
|
|
|
/**
|
|
* @dev get MakerDAO CDP engine
|
|
*/
|
|
function getSaiTubAddress() public pure returns (address sai) {
|
|
sai = 0x448a5065aeBB8E423F0896E6c5D525C040f59af3;
|
|
}
|
|
|
|
/**
|
|
* @dev get uniswap MKR exchange
|
|
*/
|
|
function getUniswapMKRExchange() public pure returns (address ume) {
|
|
ume = 0x2C4Bd064b998838076fa341A83d007FC2FA50957;
|
|
}
|
|
|
|
/**
|
|
* @dev get uniswap DAI exchange
|
|
*/
|
|
function getUniswapDAIExchange() public pure returns (address ude) {
|
|
ude = 0x09cabEC1eAd1c0Ba254B09efb3EE13841712bE14;
|
|
}
|
|
|
|
/**
|
|
* @dev get CDP bytes by CDP ID
|
|
*/
|
|
function getCDPBytes(uint cdpNum) public pure returns (bytes32 cup) {
|
|
cup = bytes32(cdpNum);
|
|
}
|
|
|
|
}
|
|
|
|
|
|
contract CDPResolver is Helpers {
|
|
|
|
function open() public returns (uint) {
|
|
bytes32 cup = TubInterface(getSaiTubAddress()).open();
|
|
return uint(cup);
|
|
}
|
|
|
|
/**
|
|
* @dev transfer CDP ownership
|
|
*/
|
|
function give(uint cdpNum, address nextOwner) public {
|
|
TubInterface(getSaiTubAddress()).give(bytes32(cdpNum), nextOwner);
|
|
}
|
|
|
|
function lock(uint cdpNum) public payable {
|
|
if (msg.value > 0) {
|
|
bytes32 cup = bytes32(cdpNum);
|
|
address tubAddr = getSaiTubAddress();
|
|
|
|
TubInterface tub = TubInterface(tubAddr);
|
|
TokenInterface weth = tub.gem();
|
|
TokenInterface peth = tub.skr();
|
|
|
|
(address lad,,,) = tub.cups(cup);
|
|
require(lad == address(this), "cup-not-owned");
|
|
|
|
weth.deposit.value(msg.value)();
|
|
|
|
uint ink = rdiv(msg.value, tub.per());
|
|
ink = rmul(ink, tub.per()) <= msg.value ? ink : ink - 1;
|
|
|
|
setAllowance(weth, tubAddr);
|
|
tub.join(ink);
|
|
|
|
setAllowance(peth, tubAddr);
|
|
tub.lock(cup, ink);
|
|
}
|
|
}
|
|
|
|
function free(uint cdpNum, uint jam) public {
|
|
if (jam > 0) {
|
|
bytes32 cup = bytes32(cdpNum);
|
|
address tubAddr = getSaiTubAddress();
|
|
|
|
TubInterface tub = TubInterface(tubAddr);
|
|
TokenInterface peth = tub.skr();
|
|
TokenInterface weth = tub.gem();
|
|
|
|
uint ink = rdiv(jam, tub.per());
|
|
ink = rmul(ink, tub.per()) <= jam ? ink : ink - 1;
|
|
tub.free(cup, ink);
|
|
|
|
setAllowance(peth, tubAddr);
|
|
|
|
tub.exit(ink);
|
|
uint freeJam = weth.balanceOf(address(this)); // withdraw possible previous stuck WETH as well
|
|
weth.withdraw(freeJam);
|
|
|
|
address(msg.sender).transfer(freeJam);
|
|
}
|
|
}
|
|
|
|
function draw(uint cdpNum, uint _wad) public {
|
|
bytes32 cup = bytes32(cdpNum);
|
|
if (_wad > 0) {
|
|
TubInterface tub = TubInterface(getSaiTubAddress());
|
|
|
|
tub.draw(cup, _wad);
|
|
tub.sai().transfer(msg.sender, _wad);
|
|
}
|
|
}
|
|
|
|
function wipe(uint cdpNum, uint _wad) public {
|
|
if (_wad > 0) {
|
|
TubInterface tub = TubInterface(getSaiTubAddress());
|
|
UniswapExchange daiEx = UniswapExchange(getUniswapDAIExchange());
|
|
UniswapExchange mkrEx = UniswapExchange(getUniswapMKRExchange());
|
|
TokenInterface dai = tub.sai();
|
|
TokenInterface mkr = tub.gov();
|
|
|
|
bytes32 cup = bytes32(cdpNum);
|
|
|
|
(address lad,,,) = tub.cups(cup);
|
|
require(lad == address(this), "cup-not-owned");
|
|
|
|
setAllowance(dai, getSaiTubAddress());
|
|
setAllowance(mkr, getSaiTubAddress());
|
|
setAllowance(dai, getUniswapDAIExchange());
|
|
|
|
(bytes32 val, bool ok) = tub.pep().peek();
|
|
|
|
// MKR required for wipe = Stability fees accrued in Dai / MKRUSD value
|
|
uint mkrFee = wdiv(rmul(_wad, rdiv(tub.rap(cup), tub.tab(cup))), uint(val));
|
|
|
|
uint daiAmt = daiEx.getTokenToEthOutputPrice(mkrEx.getEthToTokenOutputPrice(mkrFee));
|
|
daiAmt = add(_wad, daiAmt);
|
|
require(dai.transferFrom(msg.sender, address(this), daiAmt), "not-approved-yet");
|
|
|
|
if (ok && val != 0) {
|
|
daiEx.tokenToTokenSwapOutput(
|
|
mkrFee,
|
|
daiAmt,
|
|
uint(999000000000000000000),
|
|
uint(1899063809), // 6th March 2030 GMT // no logic
|
|
address(mkr)
|
|
);
|
|
}
|
|
|
|
tub.wipe(cup, _wad);
|
|
}
|
|
}
|
|
|
|
function setAllowance(TokenInterface _token, address _spender) private {
|
|
if (_token.allowance(address(this), _spender) != uint(-1)) {
|
|
_token.approve(_spender, uint(-1));
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
|
|
contract CDPCluster is CDPResolver {
|
|
|
|
function wipeAndFree(uint cdpNum, uint jam, uint _wad) public payable {
|
|
wipe(cdpNum, _wad);
|
|
free(cdpNum, jam);
|
|
}
|
|
|
|
/**
|
|
* @dev close CDP
|
|
*/
|
|
function shut(uint cdpNum) public {
|
|
bytes32 cup = bytes32(cdpNum);
|
|
TubInterface tub = TubInterface(getSaiTubAddress());
|
|
wipeAndFree(cdpNum, rmul(tub.ink(cup), tub.per()), tub.tab(cup));
|
|
tub.shut(cup);
|
|
}
|
|
|
|
/**
|
|
* @dev open a new CDP and lock ETH
|
|
*/
|
|
function openAndLock() public payable returns (uint cdpNum) {
|
|
cdpNum = open();
|
|
lock(cdpNum);
|
|
}
|
|
|
|
}
|
|
|
|
|
|
contract InstaMaker is CDPCluster {
|
|
|
|
uint public version;
|
|
|
|
/**
|
|
* @dev setting up variables on deployment
|
|
* 1...2...3 versioning in each subsequent deployments
|
|
*/
|
|
constructor(uint _version) public {
|
|
version = _version;
|
|
}
|
|
|
|
function() external payable {}
|
|
|
|
} |