Instadapp/dsa-resolvers-deprecated
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added add and remove liquidity resolver

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This commit is contained in:
Thrilok Kumar 2020-05-28 04:20:07 +05:30
parent d52c84b94e
commit 9c01ed34b1
1 changed files with 51 additions and 2 deletions
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53
contracts/protocols/uniswapV2.sol
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@ -28,6 +28,7 @@ interface TokenInterface {
function approve(address, uint) external; function approve(address, uint) external;
function transfer(address, uint) external returns (bool); function transfer(address, uint) external returns (bool);
function decimals() external view returns (uint); function decimals() external view returns (uint);
function totalSupply() external view returns (uint);
} }
contract DSMath { contract DSMath {
@ -160,22 +161,70 @@ contract UniswapHelpers is Helpers {
unitAmt = wmul(unitAmt, add(WAD, slippage)); unitAmt = wmul(unitAmt, add(WAD, slippage));
} }
function getMinAmount(
TokenInterface token,
uint amt,
uint slippage
) internal view returns(uint minAmt) {
uint _amt18 = convertTo18(token.decimals(), amt);
minAmt = wmul(_amt18, sub(WAD, slippage));
minAmt = convert18ToDec(token.decimals(), minAmt);
}
} }
contract Resolver is UniswapHelpers { contract Resolver is UniswapHelpers {
function getBuyAmount(address buyAddr, address sellAddr, uint sellAmt, uint slippage) public view returns (uint expectedRate, uint unitAmt) { function getBuyAmount(address buyAddr, address sellAddr, uint sellAmt, uint slippage)
public view returns (uint expectedRate, uint unitAmt)
{
(TokenInterface _buyAddr, TokenInterface _sellAddr) = changeEthAddress(buyAddr, sellAddr); (TokenInterface _buyAddr, TokenInterface _sellAddr) = changeEthAddress(buyAddr, sellAddr);
expectedRate = getExpectedBuyAmt(address(_buyAddr), address(_sellAddr), sellAmt); expectedRate = getExpectedBuyAmt(address(_buyAddr), address(_sellAddr), sellAmt);
unitAmt = getBuyUnitAmt(_buyAddr, expectedRate, _sellAddr, sellAmt, slippage); unitAmt = getBuyUnitAmt(_buyAddr, expectedRate, _sellAddr, sellAmt, slippage);
} }
function getSellAmount(address buyAddr, address sellAddr, uint buyAmt, uint slippage) public view returns (uint expectedRate, uint unitAmt) { function getSellAmount(address buyAddr, address sellAddr, uint buyAmt, uint slippage)
public view returns (uint expectedRate, uint unitAmt)
{
(TokenInterface _buyAddr, TokenInterface _sellAddr) = changeEthAddress(buyAddr, sellAddr); (TokenInterface _buyAddr, TokenInterface _sellAddr) = changeEthAddress(buyAddr, sellAddr);
expectedRate = getExpectedSellAmt(address(_buyAddr), address(_sellAddr), buyAmt); expectedRate = getExpectedSellAmt(address(_buyAddr), address(_sellAddr), buyAmt);
unitAmt = getSellUnitAmt(_sellAddr, expectedRate, _buyAddr, buyAmt, slippage); unitAmt = getSellUnitAmt(_sellAddr, expectedRate, _buyAddr, buyAmt, slippage);
} }
function getLiquidityAmounts(
address tokenA,
address tokenB,
uint amtA
)
public view returns (uint amtB, uint unitAmt)
{
(TokenInterface _tokenA, TokenInterface _tokenB) = changeEthAddress(tokenA, tokenB);
IUniswapV2Router01 router = IUniswapV2Router01(getUniswapAddr());
address exchangeAddr = IUniswapV2Factory(router.factory()).getPair(address(_tokenA), address(_tokenB));
require(exchangeAddr != address(0), "pair-not-found.");
uint _amtA18 = convertTo18(_tokenA.decimals(), _tokenA.balanceOf(exchangeAddr));
uint _amtB18 = convertTo18(_tokenB.decimals(), _tokenB.balanceOf(exchangeAddr));
unitAmt = wdiv(_amtB18, _amtA18);
amtB = convert18ToDec(unitAmt, amtA);
}
function getUniTokenAmount(
address tokenA,
address tokenB,
uint uniAmt
)
public view returns (uint amtA, uint amtB)
{
// TODO - shall we return min amtA and amtB?
(TokenInterface _tokenA, TokenInterface _tokenB) = changeEthAddress(tokenA, tokenB);
IUniswapV2Router01 router = IUniswapV2Router01(getUniswapAddr());
address exchangeAddr = IUniswapV2Factory(router.factory()).getPair(address(_tokenA), address(_tokenB));
require(exchangeAddr != address(0), "pair-not-found.");
TokenInterface uniToken = TokenInterface(exchangeAddr);
uint share = wdiv(uniAmt, uniToken.totalSupply());
amtA = wmul(_tokenA.balanceOf(exchangeAddr), share);
amtB = wmul(_tokenB.balanceOf(exchangeAddr), share);
}
} }