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oasis resolver added unitAmt calculations

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This commit is contained in:
Samyak Jain 2020-04-28 15:50:50 +10:00
parent 3eef3a6a34
commit a7e627922d
1 changed files with 64 additions and 3 deletions
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67
protocols/oasis.sol
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@ -12,10 +12,38 @@ interface TokenInterface {
function balanceOf(address) external view returns (uint);
function approve(address, uint) external;
function transfer(address, uint) external returns (bool);
function decimals() external view returns (uint);
}
contract Helpers {
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");
}
function sub(uint x, uint y) internal pure returns (uint z) {
require((z = x - y) <= x, "sub-overflow");
}
uint constant WAD = 10 ** 18;
function wmul(uint x, uint y) internal pure returns (uint z) {
z = add(mul(x, y), WAD / 2) / WAD;
}
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 Ethereum address
*/
@ -44,19 +72,52 @@ contract OasisHelpers is Helpers {
_buy = buy == getAddressETH() ? TokenInterface(getAddressWETH()) : TokenInterface(buy);
_sell = sell == getAddressETH() ? TokenInterface(getAddressWETH()) : TokenInterface(sell);
}
function convertTo18(uint _dec, uint256 _amt) internal pure returns (uint256 amt) {
amt = mul(_amt, 10 ** (18 - _dec));
}
function getBuyUnitAmt(
TokenInterface buyAddr,
uint expectedAmt,
TokenInterface sellAddr,
uint sellAmt,
uint slippage
) internal view returns (uint unitAmt) {
uint _sellAmt = convertTo18((sellAddr).decimals(), sellAmt);
uint _buyAmt = convertTo18(buyAddr.decimals(), expectedAmt);
unitAmt = wdiv(_buyAmt, _sellAmt);
unitAmt = wmul(unitAmt, sub(WAD, slippage));
}
function getSellUnitAmt(
TokenInterface sellAddr,
uint expectedAmt,
TokenInterface buyAddr,
uint buyAmt,
uint slippage
) internal view returns (uint unitAmt) {
uint _buyAmt = convertTo18(buyAddr.decimals(), buyAmt);
uint _sellAmt = convertTo18(sellAddr.decimals(), expectedAmt);
unitAmt = wdiv(_sellAmt, _buyAmt);
unitAmt = wmul(unitAmt, add(WAD, slippage));
}
}
contract Resolver is OasisHelpers {
function getBuyAmount(address buyAddr, address sellAddr, uint sellAmt) public view returns (uint buyAmt) {
function getBuyAmount(address buyAddr, address sellAddr, uint sellAmt, uint slippage) public view returns (uint buyAmt, uint unitAmt) {
(TokenInterface _buyAddr, TokenInterface _sellAddr) = changeEthAddress(buyAddr, sellAddr);
buyAmt = OasisInterface(getOasisAddr()).getBuyAmount(address(_buyAddr), address(_sellAddr), sellAmt);
unitAmt = getBuyUnitAmt(_buyAddr, buyAmt, _sellAddr, sellAmt, slippage);
}
function getSellAmount(address buyAddr, address sellAddr, uint buyAmt) public view returns (uint sellAmt) {
function getSellAmount(address buyAddr, address sellAddr, uint buyAmt, uint slippage) public view returns (uint sellAmt, uint unitAmt) {
(TokenInterface _buyAddr, TokenInterface _sellAddr) = changeEthAddress(buyAddr, sellAddr);
sellAmt = OasisInterface(getOasisAddr()).getPayAmount(address(_sellAddr), address(_buyAddr), buyAmt);
unitAmt = getBuyUnitAmt(_sellAddr, sellAmt, _buyAddr, buyAmt, slippage);
}
function getMinSellAmount(address sellAddr) public view returns (uint minAmt) {