ytLending supports USDC as the base token

contracts/ytLending/Configurator.sol

@@ -200,5 +200,11 @@ contract Configurator is
     function getConfiguration(address lendingProxy) external view returns (Configuration memory) {
         return configuratorParams[lendingProxy];
     }
+
+    /**
+     * @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;
 }
 

contracts/ytLending/Lending.sol

@@ -156,7 +156,7 @@ contract Lending is
     function supply(uint256 amount) external override nonReentrant whenNotPaused {
         accrueInterest();
         
-        IERC20(baseToken).safeTransferFrom(msg.sender, address(this), amount);
+        IERC20(baseToken).transferFrom(msg.sender, address(this), amount);
         
         // 获取用户当前本金
         UserBasic memory user = userBasic[msg.sender];
@@ -240,7 +240,7 @@ contract Lending is
         uint256 newTotal = userCollateral[msg.sender][asset] + amount;
         if (newTotal > config.supplyCap) revert SupplyCapExceeded();
         
-        IERC20(asset).safeTransferFrom(msg.sender, address(this), amount);
+        IERC20(asset).transferFrom(msg.sender, address(this), amount);
         
         userCollateral[msg.sender][asset] += amount;
         
@@ -440,7 +440,7 @@ contract Lending is
         if (collateralAmount > collateralReserves[asset]) revert InsufficientBalance();
         
         // 收取清算人支付的资金
-        IERC20(baseToken).safeTransferFrom(msg.sender, address(this), baseAmount);
+        IERC20(baseToken).transferFrom(msg.sender, address(this), baseAmount);
         
         // 抵押品出库
         collateralReserves[asset] -= collateralAmount;
@@ -673,5 +673,11 @@ contract Lending is
         
         emit WithdrawReserves(to, amount);
     }
+
+    /**
+     * @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;
 }
 

contracts/ytLending/LendingPriceFeed.sol

@@ -1,39 +1,59 @@
 // SPDX-License-Identifier: MIT
 pragma solidity ^0.8.0;
 
-import "../interfaces/IYTVault.sol";
-import "@openzeppelin/contracts/access/Ownable.sol";
+import "../interfaces/IYTAssetVault.sol";
+import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
+import {AggregatorV3Interface} from "@chainlink/contracts/src/v0.8/shared/interfaces/AggregatorV3Interface.sol";
 
-contract LendingPriceFeed is Ownable {
-    address public ytVault;
-    address public wusdAddress;
+contract LendingPriceFeed is OwnableUpgradeable, UUPSUpgradeable {
+    address public usdcAddress;
+    AggregatorV3Interface internal usdcPriceFeed;
 
-    error InvalidYTVaultAddress();
-    error InvalidWUSDAddress();
-    
-    constructor(address _ytVault, address _wusdAddress) Ownable(msg.sender) {
-        if (_ytVault == address(0)) revert InvalidYTVaultAddress();
-        if (_wusdAddress == address(0)) revert InvalidWUSDAddress();
-        ytVault = _ytVault;
-        wusdAddress = _wusdAddress;
+    error InvalidUsdcAddress();
+    error InvalidUsdcPriceFeedAddress();
+    error InvalidChainlinkPrice();
+
+    /// @custom:oz-upgrades-unsafe-allow constructor
+    constructor() {
+        _disableInitializers();
     }
 
-    function setYTVault(address _ytVault) external onlyOwner {
-        if (_ytVault == address(0)) revert InvalidYTVaultAddress();
-        ytVault = _ytVault;
+    function initialize(address _usdcAddress, address _usdcPriceFeed) external initializer {
+        __UUPSUpgradeable_init();
+        __Ownable_init(msg.sender);
+        if (_usdcAddress == address(0)) revert InvalidUsdcAddress();
+        if (_usdcPriceFeed == address(0)) revert InvalidUsdcPriceFeedAddress();
+        usdcAddress = _usdcAddress;   
+        usdcPriceFeed = AggregatorV3Interface(_usdcPriceFeed);
     }
 
-    function setWUSDAddress(address _wusdAddress) external onlyOwner {
-        if (_wusdAddress == address(0)) revert InvalidWUSDAddress();
-        wusdAddress = _wusdAddress;
+    function _authorizeUpgrade(address newImplementation) internal override onlyOwner {}
+
+    function setUsdcAddress(address _usdcAddress) external onlyOwner {
+        if (_usdcAddress == address(0)) revert InvalidUsdcAddress();
+        usdcAddress = _usdcAddress;
     }
     
     function getPrice(address _token) external view returns (uint256) {
-        if (_token == wusdAddress) {
-            return IYTVault(ytVault).wusdPrice();
-        } else {
-            return IYTVault(_token).ytPrice();
+        if (_token == usdcAddress) {
+            return _getUSDCPrice();
         }
+        return IYTAssetVault(_token).ytPrice();
+    }
+
+    function _getUSDCPrice() internal view returns (uint256) {
+        (
+            /* uint80 roundId */,
+            int256 price,
+            /* uint256 startedAt */,
+            /* uint256 updatedAt */,
+            /* uint80 answeredInRound */
+        ) = usdcPriceFeed.latestRoundData();
+        
+        if (price <= 0) revert InvalidChainlinkPrice();
+        
+        return uint256(price) * 1e22; // 1e22 = 10^(30-8)
     }
 }
 

contracts/ytLp/core/YTPoolManager.sol

@@ -165,7 +165,7 @@ contract YTPoolManager is Initializable, UUPSUpgradeable, ReentrancyGuardUpgrade
         uint256 aumInUsdy = getAumInUsdy(true);
         uint256 ytLPSupply = IERC20(ytLP).totalSupply();
         
-        IERC20(_token).safeTransferFrom(_fundingAccount, ytVault, _amount);
+        IERC20(_token).transferFrom(_fundingAccount, ytVault, _amount);
         uint256 usdyAmount = IYTVault(ytVault).buyUSDY(_token, address(this));
         if (usdyAmount < _minUsdy) revert InsufficientOutput();
         

contracts/ytLp/core/YTRewardRouter.sol

@@ -117,7 +117,7 @@ contract YTRewardRouter is Initializable, UUPSUpgradeable, ReentrancyGuardUpgrad
         
         address account = msg.sender;
         
-        IERC20(_token).safeTransferFrom(account, address(this), _amount);
+        IERC20(_token).transferFrom(account, address(this), _amount);
         IERC20(_token).approve(ytPoolManager, _amount);
         
         uint256 ytLPAmount = IYTPoolManager(ytPoolManager).addLiquidityForAccount(
@@ -181,7 +181,7 @@ contract YTRewardRouter is Initializable, UUPSUpgradeable, ReentrancyGuardUpgrad
         
         address account = msg.sender;
         
-        IERC20(_tokenIn).safeTransferFrom(account, ytVault, _amountIn);
+        IERC20(_tokenIn).transferFrom(account, ytVault, _amountIn);
         
         uint256 amountOut = IYTVault(ytVault).swap(_tokenIn, _tokenOut, _receiver);
         

contracts/ytVault/YTAssetVault.sol

@@ -292,7 +292,7 @@ contract YTAssetVault is
         }
         
         // 转入USDC
-        IERC20(usdcAddress).safeTransferFrom(msg.sender, address(this), _usdcAmount);
+        IERC20(usdcAddress).transferFrom(msg.sender, address(this), _usdcAmount);
         
         // 铸造YT
         _mint(msg.sender, ytAmount);
@@ -551,7 +551,7 @@ contract YTAssetVault is
         }
         
         // 从manager转入USDC到合约
-        IERC20(usdcAddress).safeTransferFrom(msg.sender, address(this), _amount);
+        IERC20(usdcAddress).transferFrom(msg.sender, address(this), _amount);
         
         emit AssetsDeposited(_amount);
     }