update ytLending

contracts/ytLending/Lending.sol

@@ -50,8 +50,7 @@ contract Lending is
         // 常量：一年的秒数
         uint256 SECONDS_PER_YEAR = 365 * 24 * 60 * 60;  // 31,536,000
         
-        // 设置利率参数（将年化利率转换为每秒利率，只计算一次）
-        // 这样可以大幅降低每次计提利息的 Gas 成本并提高精度
+        // 设置利率参数
         supplyKink = config.supplyKink;
         supplyPerSecondInterestRateSlopeLow = uint64(config.supplyPerYearInterestRateSlopeLow / SECONDS_PER_YEAR);
         supplyPerSecondInterestRateSlopeHigh = uint64(config.supplyPerYearInterestRateSlopeHigh / SECONDS_PER_YEAR);
@@ -78,9 +77,9 @@ contract Lending is
             AssetConfig memory assetConfig = config.assetConfigs[i];
             
             // 验证参数合法性（必须 < 1）
-            require(assetConfig.liquidationFactor < 1e18, "Invalid liquidationFactor");
-            require(assetConfig.borrowCollateralFactor < 1e18, "Invalid borrowCF");
-            require(assetConfig.liquidateCollateralFactor < 1e18, "Invalid liquidateCF");
+            if(assetConfig.liquidationFactor >= 1e18) revert InvalidLiquidationFactor();
+            if(assetConfig.borrowCollateralFactor >= 1e18) revert InvalidBorrowCollateralFactor();
+            if(assetConfig.liquidateCollateralFactor >= 1e18) revert InvalidLiquidateCollateralFactor();
             
             assetConfigs[assetConfig.asset] = assetConfig;
             assetList.push(assetConfig.asset);
@@ -263,6 +262,7 @@ contract Lending is
 
     /**
      * @notice 借款
+     * @dev baseBorrowMin 是用户借款的最小金额，如果用户借款后，余额小于 baseBorrowMin（由正数变为负数同理），则抛出 BorrowTooSmall 错误
      */
     function borrow(uint256 amount) external override nonReentrant whenNotPaused {
         accrueInterest();
@@ -294,10 +294,10 @@ contract Lending is
         totalSupplyBase -= withdrawAmount;
         totalBorrowBase += borrowAmount;
         
-        // 更新用户本金
+        // 更新用户本金，方便检查更新后的用户本金是否大于还是小于抵押品价值
         userBasic[msg.sender].principal = newPrincipal;
         
-        // 检查抵押品是否充足
+        // 检查抵押品是否充足  
         if (!_isSolvent(msg.sender)) revert InsufficientCollateral();
         
         IERC20(baseToken).safeTransfer(msg.sender, amount);
@@ -307,6 +307,7 @@ contract Lending is
 
     /**
      * @notice 清算不良债务（内部实现）
+     * @dev 当用户抵押品由于乘以liquidateCollateralFactor后，小于债务价值时，会进行清算，清算后，如果实际抵押品价值大于债务价值，则将差额部分作为用户本金（本金以baseToken显示），否则将差额部分作为坏账，由协议承担
      */
     function _absorbInternal(address absorber, address borrower) internal {
         if (!isLiquidatable(borrower)) revert NotLiquidatable();
@@ -438,7 +439,6 @@ contract Lending is
         IERC20(asset).safeTransfer(recipient, collateralAmount);
         
         // 注意：收入会自动体现在 getReserves() 中，因为 balance 增加了
-        
         emit BuyCollateral(msg.sender, asset, baseAmount, collateralAmount);
     }
     
@@ -451,7 +451,7 @@ contract Lending is
         uint256 assetPrice = IPriceFeed(assetConfig.priceFeed).getPrice();
         uint256 basePrice = IPriceFeed(baseTokenPriceFeed).getPrice();
         
-        // 计算折扣率 - 使用 Compound V3 的 mulFactor 方式
+        // 计算折扣率
         // discountFactor = storeFrontPriceFactor * (FACTOR_SCALE - liquidationFactor) / FACTOR_SCALE
         uint256 FACTOR_SCALE = 1e18;
         uint256 discountFactor = (storeFrontPriceFactor * (FACTOR_SCALE - assetConfig.liquidationFactor)) / FACTOR_SCALE;