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add fundWithToken

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add maxSlippage to contract
This commit is contained in:
Barry Gitarts 2019-10-09 11:56:39 -04:00 committed by Barry G
parent ffa9f64d20
commit 315db5a6f1
1 changed files with 40 additions and 11 deletions
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51
contracts/SwapProxy.sol
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@ -29,6 +29,7 @@ contract SwapProxy {
KyberNetworkProxy public kyberProxy;
LiquidPledging public liquidPledging;
address public vault;
uint public maxSlippage;
/**
* @param _liquidPledging LiquidPledging contract address
@ -36,7 +37,7 @@ contract SwapProxy {
* @param _ETH Kyber ETH address
* @param _vault address that receives swap fees
*/
constructor(address _liquidPledging, address _kyberProxy, address _ETH, address _vault) public {
constructor(address _liquidPledging, address _kyberProxy, address _ETH, address _vault, uint _maxSlippage) public {
if (_vault == address(0)){
_vault = address(this);
}
@ -44,6 +45,7 @@ contract SwapProxy {
kyberProxy = KyberNetworkProxy(_kyberProxy);
ETH = _ETH;
vault = _vault;
maxSlippage = _maxSlippage;
}
/**
@ -72,17 +74,44 @@ contract SwapProxy {
* @param token token to convert from ETH
*/
function fundWithETH(uint64 idReceiver, address token) public payable {
require(msg.value > 0, "Not enough ETH");
require(msg.value > 0, "Not enough ETH");
(uint expectedRate, uint slippageRate) = kyberProxy.getExpectedRate(ETH, token, msg.value);
require(expectedRate > 0, "expected rate can not be 0");
uint slippagePercent = (slippageRate * 100) / expectedRate;
require(slippagePercent < 15, "slippage exceeds 15%, try a smaller amount");
uint maxDestinationAmount = (slippageRate / (10**18)) * msg.value;
uint amount = kyberProxy.trade.value(msg.value)(ETH, msg.value, token, address(this), maxDestinationAmount, slippageRate, vault);
require(amount > 0, "Not enough tokens for funding");
(uint expectedRate, uint slippageRate) = kyberProxy.getExpectedRate(ETH, token, msg.value);
require(expectedRate > 0, "expected rate can not be 0");
uint slippagePercent = (slippageRate * 100) / expectedRate;
require(slippagePercent <= maxSlippage, "slippage exceeds maximum, try a smaller amount");
uint maxDestinationAmount = (slippageRate / (10**18)) * msg.value;
uint amount = kyberProxy.trade.value(msg.value)(ETH, msg.value, token, address(this), maxDestinationAmount, slippageRate, vault);
require(amount > 0, "Not enough tokens for funding");
ERC20Token(token).approve(address(LiquidPledging), sntBalance);
liquidPledging.addGiverAndDonate(idReceiver, token, amount);
ERC20Token(token).approve(address(LiquidPledging), amount);
liquidPledging.addGiverAndDonate(idReceiver, token, amount);
}
/**
* @notice Funds a project in desired token using an ERC20 Token
* @param idReceiver receiver of donation
* @param token token to convert from
* @param amount being sent
* @param receiverToken token being converted to
*/
function fundWithToken(uint64 idReceiver, address token, uint amount, address receiverToken) public {
require(ERC20Token(token).transferFrom(msg.sender, address(this), amount));
(uint expectedRate, uint slippageRate) = kyberProxy.getExpectedRate(ETH, token, msg.value);
(uint expectedRate, uint slippageRate) = kyberProxy.getExpectedRate(token, receiverToken, amount);
require(expectedRate > 0, "expected rate can not be 0");
uint slippagePercent = (slippageRate * 100) / expectedRate;
require(slippagePercent <= maxSlippage, "slippage exceeds maximum, try a smaller amount");
require(ERC20Token(token).approve(address(kyberProxy), 0), "Could not reset approval");
require(ERC20Token(token).approve(address(kyberProxy), amount), "Could not approve amount");
uint maxDestinationAmount = (slippageRate / (10**18)) * amount;
uint receiverAmount = kyberProxy.trade(token, amount, receiverToken, address(this), maxDestinationAmount, slippageRate, vault);
require(receiverAmount > 0, "Not enough tokens for funding");
ERC20Token(token).approve(address(LiquidPledging), receiverAmount);
liquidPledging.addGiverAndDonate(idReceiver, receiverToken, receiverAmount);
}
}