84 lines
3.0 KiB
Solidity
84 lines
3.0 KiB
Solidity
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// SPDX-License-Identifier: MIT
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pragma solidity ^0.6.12;
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pragma experimental ABIEncoderV2;
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import { FeeManager, IERC20, ITornadoInstance, UniswapV3OracleHelper } from "../FeeManager.sol";
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import { OwnableLibrary } from "../libraries/OwnableLibrary.sol";
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/**
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* @dev Stores and returns overrided TORN-Token price
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Literally you don't need to do this unless you don't want to occupy another storage slot for the contract
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*/
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library TokenPriceLibrary {
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struct PriceStorage {
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mapping(address => uint256) _prices;
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}
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bytes32 private constant PriceStorageLocation = keccak256(abi.encode(uint256(keccak256("tornado.storage.price"))));
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function _getPriceStorage() private pure returns (PriceStorage storage pointer) {
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bytes32 slot = PriceStorageLocation;
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assembly {
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pointer_slot := slot
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}
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}
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function setPrice(address _token, uint256 _price) internal {
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PriceStorage storage priceStorage = _getPriceStorage();
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priceStorage._prices[_token] = _price;
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}
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function getPrice(address _token) internal view returns (uint256 price) {
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PriceStorage storage priceStorage = _getPriceStorage();
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price = priceStorage._prices[_token];
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}
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}
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/**
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* @dev A testnet feeManager that the maintainer could override V3 oracles, assuming it has been deployed with TestnetProxy
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*/
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contract TestnetFeeManager is FeeManager {
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constructor(
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address _torn,
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address _governance,
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address _registry
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) public FeeManager(_torn, _governance, _registry) {}
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modifier onlyOwner {
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require(OwnableLibrary.getOwner() == msg.sender, "Not an owner");
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_;
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}
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function setTokenPrice(address _token, uint256 _price) external onlyOwner {
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TokenPriceLibrary.setPrice(_token, _price);
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}
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function getTokenPriceRatio(address _token, uint24 _uniswapPoolSwappingFee) public view returns (uint256) {
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return TokenPriceLibrary.getPrice(_token) != 0
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? TokenPriceLibrary.getPrice(_token)
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: UniswapV3OracleHelper.getPriceRatioOfTokens(
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[torn, _token],
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[uniswapTornPoolSwappingFee, _uniswapPoolSwappingFee],
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uniswapTimePeriod
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);
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}
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function calculatePoolFee(ITornadoInstance _instance) public override view returns (uint160) {
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(bool isERC20, IERC20 token, , uint24 uniswapPoolSwappingFee, uint32 protocolFeePercentage) = registry.instances(_instance);
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if (protocolFeePercentage == 0) {
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return 0;
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}
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token = token == IERC20(0) && !isERC20 ? IERC20(UniswapV3OracleHelper.WETH) : token; // for eth instances
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uint256 tokenPriceRatio = getTokenPriceRatio(address(token), uniswapPoolSwappingFee);
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return uint160(
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_instance
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.denomination()
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.mul(UniswapV3OracleHelper.RATIO_DIVIDER)
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.div(tokenPriceRatio)
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.mul(uint256(protocolFeePercentage))
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.div(PROTOCOL_FEE_DIVIDER)
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);
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}
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}
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