38 lines
1.1 KiB
Solidity
38 lines
1.1 KiB
Solidity
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pragma solidity ^0.5.0;
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import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
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import "openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol";
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import "openzeppelin-solidity/contracts/token/ERC20/ERC20Burnable.sol";
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import "math.sol";
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contract StakingPool is ERC20, ERC20Detailed, ERC20Burnable, DSMath {
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uint private INITIAL_SUPPLY = 0;
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constructor () public ERC20Detailed("TellerStatus", "TSNT", 18) {
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}
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function exchangeRate (uint256 excludeAmount) public view returns (uint256) {
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if (totalSupply() == 0) return 1000000000000000000;
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return wdiv(address(this).balance - excludeAmount, totalSupply());
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}
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function estimatedTokens(uint256 value) public view returns (uint256) {
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uint256 rate = exchangeRate(value);
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return wdiv(value, wdiv(rate, 1000000000000000000));
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}
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function deposit () public payable {
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uint256 rate = exchangeRate(msg.value);
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_mint(msg.sender, estimatedTokens(msg.value));
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}
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function withdraw (uint256 amount) public {
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uint256 rate = exchangeRate(0);
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burn(amount);
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msg.sender.transfer(wmul(amount, wdiv(rate, 1000000000000000000)));
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}
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function() external payable {
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}
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}
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