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contracts/ytLp/core/YTPriceFeed.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
import "../../interfaces/IYTToken.sol";
/**
* @title YTPriceFeed
* @notice 价格读取器，直接从YT合约读取价格变量（带保护机制和价差）
* @dev UUPS可升级合约
*/
contract YTPriceFeed is Initializable, UUPSUpgradeable {
error Forbidden();
error MaxChangeTooHigh();
error PriceChangeTooLarge();
error SpreadTooHigh();
error InvalidAddress();
address public gov;
uint256 public constant PRICE_PRECISION = 10 ** 30;
uint256 public constant BASIS_POINTS_DIVISOR = 10000;
uint256 public constant MAX_SPREAD_BASIS_POINTS = 200; // 最大2%价差
// WUSD固定价格
address public wusdAddress;
// WUSD价格来源
address public wusdPriceSource;
// 价格保护参数
uint256 public maxPriceChangeBps; // 5% 最大价格变动
// 价差配置（每个代币可以有不同的价差）
mapping(address => uint256) public spreadBasisPoints;
// 价格历史记录
mapping(address => uint256) public lastPrice;
// 价格更新权限
mapping(address => bool) public isKeeper;
event PriceUpdate(address indexed token, uint256 oldPrice, uint256 newPrice, uint256 timestamp);
event SpreadUpdate(address indexed token, uint256 spreadBps);
event KeeperSet(address indexed keeper, bool isActive);
modifier onlyGov() {
if (msg.sender != gov) revert Forbidden();
_;
}
modifier onlyKeeper() {
if (!isKeeper[msg.sender] && msg.sender != gov) revert Forbidden();
_;
}
/**
* @notice 初始化合约
*/
function initialize(address _wusdAddress) external initializer {
__UUPSUpgradeable_init();
if (_wusdAddress == address(0)) revert InvalidAddress();
wusdAddress = _wusdAddress;
gov = msg.sender;
maxPriceChangeBps = 500; // 5% 最大价格变动
}
/**
* @notice 授权升级（仅gov可调用）
* @param newImplementation 新实现合约地址
*/
function _authorizeUpgrade(address newImplementation) internal override onlyGov {}
/**
* @notice 设置WUSD价格来源（YTAssetVault地址）
* @param _wusdPriceSource YTAssetVault合约地址
*/
function setWusdPriceSource(address _wusdPriceSource) external onlyGov {
wusdPriceSource = _wusdPriceSource;
}
/**
* @notice 设置keeper权限
* @param _keeper keeper地址
* @param _isActive 是否激活
*/
function setKeeper(address _keeper, bool _isActive) external onlyGov {
isKeeper[_keeper] = _isActive;
emit KeeperSet(_keeper, _isActive);
}
/**
* @notice 设置最大价格变动百分比
* @param _maxPriceChangeBps 最大变动（基点）
*/
function setMaxPriceChangeBps(uint256 _maxPriceChangeBps) external onlyGov {
if (_maxPriceChangeBps > 2000) revert MaxChangeTooHigh(); // 最大20%
maxPriceChangeBps = _maxPriceChangeBps;
}
/**
* @notice 设置代币价差
* @param _token 代币地址
* @param _spreadBasisPoints 价差（基点）例如：10 = 0.1%, 100 = 1%
*/
function setSpreadBasisPoints(address _token, uint256 _spreadBasisPoints) external onlyGov {
if (_spreadBasisPoints > MAX_SPREAD_BASIS_POINTS) revert SpreadTooHigh();
spreadBasisPoints[_token] = _spreadBasisPoints;
emit SpreadUpdate(_token, _spreadBasisPoints);
}
/**
* @notice 批量设置代币价差
* @param _tokens 代币地址数组
* @param _spreadBasisPoints 价差数组
*/
function setSpreadBasisPointsForMultiple(
address[] calldata _tokens,
uint256[] calldata _spreadBasisPoints
) external onlyGov {
require(_tokens.length == _spreadBasisPoints.length, "length mismatch");
for (uint256 i = 0; i < _tokens.length; i++) {
if (_spreadBasisPoints[i] > MAX_SPREAD_BASIS_POINTS) revert SpreadTooHigh();
spreadBasisPoints[_tokens[i]] = _spreadBasisPoints[i];
emit SpreadUpdate(_tokens[i], _spreadBasisPoints[i]);
}
}
/**
* @notice 强制更新价格（紧急情况）
* @param _token 代币地址
* @param _price 新价格
*/
function forceUpdatePrice(address _token, uint256 _price) external onlyGov {
uint256 oldPrice = lastPrice[_token];
lastPrice[_token] = _price;
emit PriceUpdate(_token, oldPrice, _price, block.timestamp);
}
/**
* @notice 获取YT代币价格（带波动保护和价差）
* @param _token 代币地址
* @param _maximise true=最大价格（上浮价差，对协议有利）, false=最小价格（下压价差，对协议有利）
* @return 价格（30位精度）
*
* 使用场景：
* - 添加流动性时AUM计算：_maximise=true（高估AUM，用户获得较少LP）
* - 移除流动性时AUM计算：_maximise=false（低估AUM，用户获得较少代币）
* - buyUSDY时（用户卖代币）：_maximise=false（低估用户代币价值）
* - sellUSDY时（用户买代币）：_maximise=true（高估需支付的代币价值）
* - swap时tokenIn：_maximise=false（低估输入）
* - swap时tokenOut：_maximise=true（高估输出）
*/
function getPrice(address _token, bool _maximise) external view returns (uint256) {
if (_token == wusdAddress) {
return _getWUSDPrice();
}
uint256 basePrice = _getRawPrice(_token);
// 价格波动检查
_validatePriceChange(_token, basePrice);
// 应用价差
return _applySpread(_token, basePrice, _maximise);
}
/**
* @notice 更新价格并返回（由keeper调用）
* @param _token 代币地址
* @return 新价格
*/
function updatePrice(address _token) external onlyKeeper returns (uint256) {
if (_token == wusdAddress) {
return _getWUSDPrice();
}
uint256 oldPrice = lastPrice[_token];
uint256 newPrice = _getRawPrice(_token);
// 价格波动检查
_validatePriceChange(_token, newPrice);
lastPrice[_token] = newPrice;
emit PriceUpdate(_token, oldPrice, newPrice, block.timestamp);
return newPrice;
}
/**
* @notice 直接读取YT代币的ytPrice变量
*/
function _getRawPrice(address _token) private view returns (uint256) {
return IYTToken(_token).ytPrice();
}
/**
* @notice 从配置的YTAssetVault读取wusdPrice
* @dev 如果未设置wusdPriceSource，返回固定价格1.0
*/
function _getWUSDPrice() private view returns (uint256) {
if (wusdPriceSource == address(0)) {
return PRICE_PRECISION; // 默认1.0
}
return IYTToken(wusdPriceSource).wusdPrice();
}
/**
* @notice 应用价差
* @param _token 代币地址
* @param _basePrice 基础价格
* @param _maximise true=上浮价格，false=下压价格
* @return 应用价差后的价格
*/
function _applySpread(
address _token,
uint256 _basePrice,
bool _maximise
) private view returns (uint256) {
uint256 spread = spreadBasisPoints[_token];
// 如果没有设置价差，直接返回基础价格
if (spread == 0) {
return _basePrice;
}
if (_maximise) {
// 上浮价格：basePrice * (1 + spread%)
return _basePrice * (BASIS_POINTS_DIVISOR + spread) / BASIS_POINTS_DIVISOR;
} else {
// 下压价格：basePrice * (1 - spread%)
return _basePrice * (BASIS_POINTS_DIVISOR - spread) / BASIS_POINTS_DIVISOR;
}
}
/**
* @notice 验证价格变动是否在允许范围内
*/
function _validatePriceChange(address _token, uint256 _newPrice) private view {
uint256 oldPrice = lastPrice[_token];
// 首次设置价格，跳过检查
if (oldPrice == 0) {
return;
}
// 计算价格变动百分比
uint256 priceDiff = _newPrice > oldPrice ? _newPrice - oldPrice : oldPrice - _newPrice;
uint256 maxDiff = oldPrice * maxPriceChangeBps / BASIS_POINTS_DIVISOR;
if (priceDiff > maxDiff) revert PriceChangeTooLarge();
}
/**
* @notice 获取价格详细信息
*/
function getPriceInfo(address _token) external view returns (
uint256 currentPrice,
uint256 cachedPrice,
uint256 maxPrice,
uint256 minPrice,
uint256 spread
) {
if (_token == wusdAddress) {
uint256 wusdPrice = _getWUSDPrice();
currentPrice = wusdPrice;
cachedPrice = wusdPrice;
maxPrice = wusdPrice;
minPrice = wusdPrice;
spread = 0;
} else {
currentPrice = _getRawPrice(_token);
cachedPrice = lastPrice[_token];
spread = spreadBasisPoints[_token];
maxPrice = _applySpread(_token, currentPrice, true);
minPrice = _applySpread(_token, currentPrice, false);
}
}
/**
* @notice 获取最大价格（上浮价差）
*/
function getMaxPrice(address _token) external view returns (uint256) {
if (_token == wusdAddress) {
// WUSD通常不需要价差，直接返回原价格
return _getWUSDPrice();
}
uint256 basePrice = _getRawPrice(_token);
_validatePriceChange(_token, basePrice);
return _applySpread(_token, basePrice, true);
}
/**
* @notice 获取最小价格（下压价差）
*/
function getMinPrice(address _token) external view returns (uint256) {
if (_token == wusdAddress) {
// WUSD通常不需要价差，直接返回原价格
return _getWUSDPrice();
}
uint256 basePrice = _getRawPrice(_token);
_validatePriceChange(_token, basePrice);
return _applySpread(_token, basePrice, false);
}
/**
* @dev 预留存储空间，用于未来升级时添加新的状态变量
* 50个slot = 50 * 32 bytes = 1600 bytes
*/
uint256[50] private __gap;
}