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remove liquidity complete

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This commit is contained in:
Samyak Jain 2019-04-06 16:39:34 +05:30
parent 1fe5eb1250
commit f298a6da91
1 changed files with 24 additions and 7 deletions
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31
contracts/ProxyLogics/InstaUniswapPool.sol
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@ -129,19 +129,18 @@ contract Helper {
* @dev setting allowance to kyber for the "user proxy" if required * @dev setting allowance to kyber for the "user proxy" if required
* @param token is the token address * @param token is the token address
*/ */
function setApproval(address token, address exchangeAddr) internal { function setApproval(address token, address to) internal {
IERC20(token).approve(exchangeAddr, 2**255); IERC20(token).approve(to, 2**255);
} }
/** /**
* @dev configuring token approval with user proxy * @dev configuring token approval with user proxy
* @param token is the token * @param token is the token
*/ */
function manageApproval(address token, uint srcAmt) internal returns (uint) { function manageApproval(address token, uint srcAmt, address to) internal returns (uint) {
address exchangeAddr = getExchangeAddress(token); uint tokenAllowance = IERC20(token).allowance(address(this), to);
uint tokenAllowance = IERC20(token).allowance(address(this), exchangeAddr);
if (srcAmt > tokenAllowance) { if (srcAmt > tokenAllowance) {
setApproval(token, exchangeAddr); setApproval(token, to);
} }
} }
@ -156,7 +155,7 @@ contract InstaUniswapPool is Helper {
uint tokenToDeposit = msg.value * exchangeTokenBal / exchangeEthBal + 1; uint tokenToDeposit = msg.value * exchangeTokenBal / exchangeEthBal + 1;
require(tokenToDeposit < maxDepositedTokens, "Token to deposit is greater than Max token to Deposit"); require(tokenToDeposit < maxDepositedTokens, "Token to deposit is greater than Max token to Deposit");
IERC20(token).transferFrom(msg.sender, address(this), tokenToDeposit); IERC20(token).transferFrom(msg.sender, address(this), tokenToDeposit);
manageApproval(token, tokenToDeposit); manageApproval(token, tokenToDeposit, exchangeAddr);
tokensMinted = UniswapPool(exchangeAddr).addLiquidity.value(msg.value)( tokensMinted = UniswapPool(exchangeAddr).addLiquidity.value(msg.value)(
uint(0), uint(0),
tokenToDeposit, tokenToDeposit,
@ -164,5 +163,23 @@ contract InstaUniswapPool is Helper {
); );
} }
function removeLiquidity(
address token,
uint amount,
uint minEth,
uint minTokens
) public returns (uint ethReturned, uint tokenReturned)
{
address exchangeAddr = getExchangeAddress(token);
manageApproval(exchangeAddr, amount, exchangeAddr);
(ethReturned, tokenReturned) = UniswapPool(exchangeAddr).removeLiquidity(
amount,
minEth,
minTokens,
uint(1899063809) // 6th March 2030 GMT // no logic
);
address(msg.sender).transfer(ethReturned);
IERC20(token).transfer(msg.sender, tokenReturned);
}
} }