Instadapp/yield-contract
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Added variable exchange rate

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This commit is contained in:
Thrilok Kumar 2020-08-27 12:23:28 +05:30
parent de4232c233
commit abeeb63865
1 changed files with 20 additions and 5 deletions
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25
contracts/tokenPool.sol
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@ -31,6 +31,20 @@ interface RateInterface {
} }
contract PoolToken is ReentrancyGuard, DSMath, ERC20Pausable { contract PoolToken is ReentrancyGuard, DSMath, ERC20Pausable {
function convert36To18(uint _dec, uint256 _amt) public pure returns (uint256 amt) {
amt = (_amt / 10 ** (18 - _dec));
}
function convert18To36(uint _dec, uint256 _amt) public pure returns (uint256 amt) {
amt = mul(_amt, 10 ** (18 - _dec));
}
function convertDecTo18(uint _dec, uint256 _amt) internal pure returns (uint256 amt) {
amt = mul(_amt, 10 ** (18 - _dec));
}
using SafeERC20 for IERC20; using SafeERC20 for IERC20;
event LogDeploy(uint amount); event LogDeploy(uint amount);
@ -42,6 +56,7 @@ contract PoolToken is ReentrancyGuard, DSMath, ERC20Pausable {
event LogPausePool(bool); event LogPausePool(bool);
IERC20 public immutable baseToken; // Base token. Eg:- DAI, USDC, etc. IERC20 public immutable baseToken; // Base token. Eg:- DAI, USDC, etc.
uint256 public immutable baseDecimal; // Base token. Eg:- DAI, USDC, etc.
RegistryInterface public immutable registry; // Pool Registry RegistryInterface public immutable registry; // Pool Registry
IndexInterface public constant instaIndex = IndexInterface(0x2971AdFa57b20E5a416aE5a708A8655A9c74f723); // Main Index IndexInterface public constant instaIndex = IndexInterface(0x2971AdFa57b20E5a416aE5a708A8655A9c74f723); // Main Index
@ -56,6 +71,7 @@ contract PoolToken is ReentrancyGuard, DSMath, ERC20Pausable {
address _baseToken address _baseToken
) public ERC20(_name, _symbol) { ) public ERC20(_name, _symbol) {
baseToken = IERC20(_baseToken); baseToken = IERC20(_baseToken);
baseDecimal = ERC20(_baseToken).decimals();
registry = RegistryInterface(_registry); registry = RegistryInterface(_registry);
} }
@ -71,12 +87,11 @@ contract PoolToken is ReentrancyGuard, DSMath, ERC20Pausable {
} }
function setExchangeRate() public isChief { function setExchangeRate() public isChief {
uint _previousRate = exchangeRate; uint _previousRate = convert36To18(baseDecimal, exchangeRate);
uint _totalToken = RateInterface(registry.poolLogic(address(this))).getTotalToken(); uint _totalToken = RateInterface(registry.poolLogic(address(this))).getTotalToken();
uint _currentRate = wdiv(_totalToken, totalSupply()); uint _currentRate = convertDecTo18(baseDecimal, wdiv(_totalToken, totalSupply()));
if (_currentRate < _previousRate) { if (_currentRate < _previousRate) {
uint difRate = _previousRate - _currentRate; uint difTkn = sub(tokenBalance, _totalToken);
uint difTkn = wmul(_totalToken, difRate);
insuranceAmt = sub(insuranceAmt, difTkn); insuranceAmt = sub(insuranceAmt, difTkn);
_currentRate = _previousRate; _currentRate = _previousRate;
} else { } else {
@ -88,7 +103,7 @@ contract PoolToken is ReentrancyGuard, DSMath, ERC20Pausable {
_currentRate = sub(_currentRate, insureFee); _currentRate = sub(_currentRate, insureFee);
tokenBalance = sub(_totalToken, insuranceAmt); tokenBalance = sub(_totalToken, insuranceAmt);
} }
exchangeRate = _currentRate; exchangeRate = convert18To36(baseDecimal, _currentRate);
emit LogExchangeRate(exchangeRate, tokenBalance, insuranceAmt); emit LogExchangeRate(exchangeRate, tokenBalance, insuranceAmt);
} }