update lending contract

contracts/ytLending/Lending.sol

@@ -46,9 +46,9 @@ contract Lending is
         // 设置基础配置
         baseToken = config.baseToken;
         baseTokenPriceFeed = config.baseTokenPriceFeed;
-        
+
         // 常量：一年的秒数
-        uint256 SECONDS_PER_YEAR = 365 * 24 * 60 * 60;  // 31,536,000
+        uint64 SECONDS_PER_YEAR = 365 * 24 * 60 * 60;  // 31,536,000
         
         // 设置利率参数
         supplyKink = config.supplyKink;
@@ -113,7 +113,7 @@ contract Lending is
         if (timeElapsed == 0) return;
         
         // 计算实际的 totalSupply 和 totalBorrow（含利息）
-        // 注意：totalSupplyBase 和 totalBorrowBase 都是正数本金
+        // 注意：totalSupplyBase 和 totalBorrowBase 都是正数本金（正数=存款本金，负数=借款本金）
         // supplyIndex 用于存款，borrowIndex 用于借款
         uint256 totalSupply = (uint256(totalSupplyBase) * supplyIndex) / 1e18;
         uint256 totalBorrow = (uint256(totalBorrowBase) * borrowIndex) / 1e18;
@@ -137,7 +137,7 @@ contract Lending is
             borrowPerSecondInterestRateBase
         );
         
-        // 更新利息累计因子（使用每秒利率，计算更精确且 Gas 更低）
+        // 更新利息累计因子（使用每秒利率）
         supplyIndex = LendingMath.accrueInterest(supplyIndex, supplyRate, timeElapsed);
         borrowIndex = LendingMath.accrueInterest(borrowIndex, borrowRate, timeElapsed);
         
@@ -167,7 +167,7 @@ contract Lending is
         uint256 newIndex = newBalance >= 0 ? supplyIndex : borrowIndex;
         int104 newPrincipal = LendingMath.balanceToPrincipal(newBalance, newIndex);
         
-        // 计算还款和存款金额
+        // 根据新旧本金，计算还款和存款金额
         (uint104 repayAmount, uint104 supplyAmount) = LendingMath.repayAndSupplyAmount(oldPrincipal, newPrincipal);
         
         // 更新全局状态
@@ -307,7 +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
+     * @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乘以liquidateCollateralFactor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();
@@ -432,7 +432,7 @@ contract Lending is
         uint256 totalBorrow = (uint256(totalBorrowBase) * borrowIndex) / 1e18;
         int256 currentReserves = int256(balance) - int256(totalSupply) + int256(totalBorrow);
         if (currentReserves >= 0 && uint256(currentReserves) >= targetReserves) {
-            revert InsufficientBalance(); // 储备金充足，无需出售
+            revert NotForSale(); // 储备金充足，无需出售
         }
         
         // 收取清算人支付的资金
@@ -619,6 +619,21 @@ contract Lending is
         return perSecondRate * 31536000; // SECONDS_PER_YEAR
     }
 
+    function getBorrowRate() external view override returns (uint64) {
+        uint256 totalSupply = (uint256(totalSupplyBase) * supplyIndex) / 1e18;
+        uint256 totalBorrow = (uint256(totalBorrowBase) * borrowIndex) / 1e18;
+        uint64 utilization = LendingMath.getUtilization(totalSupply, totalBorrow);
+        uint64 perSecondRate = LendingMath.getBorrowRate(
+            utilization,
+            borrowKink,
+            borrowPerSecondInterestRateSlopeLow,
+            borrowPerSecondInterestRateSlopeHigh,
+            borrowPerSecondInterestRateBase
+        );
+        // 转换为年化利率（APY）
+        return perSecondRate * 31536000; // SECONDS_PER_YEAR
+    }
+
     /**
      * @notice 提取协议储备金（仅 owner）
      */
@@ -638,20 +653,5 @@ contract Lending is
         
         emit WithdrawReserves(to, amount);
     }
-    
-    function getBorrowRate() external view override returns (uint64) {
-        uint256 totalSupply = (uint256(totalSupplyBase) * supplyIndex) / 1e18;
-        uint256 totalBorrow = (uint256(totalBorrowBase) * borrowIndex) / 1e18;
-        uint64 utilization = LendingMath.getUtilization(totalSupply, totalBorrow);
-        uint64 perSecondRate = LendingMath.getBorrowRate(
-            utilization,
-            borrowKink,
-            borrowPerSecondInterestRateSlopeLow,
-            borrowPerSecondInterestRateSlopeHigh,
-            borrowPerSecondInterestRateBase
-        );
-        // 转换为年化利率（APY）
-        return perSecondRate * 31536000; // SECONDS_PER_YEAR
-    }
 }
 

contracts/ytLending/LendingConfiguration.sol

@@ -10,14 +10,14 @@ contract LendingConfiguration {
         address asset;                      // 资产地址
         address priceFeed;                  // 价格预言机地址
         uint8 decimals;                     // 小数位数
-        uint64 borrowCollateralFactor;     // 借款抵押率 (例: 0.8e18 = 80%)
+        uint64 borrowCollateralFactor;     // 借款抵押率
-        uint64 liquidateCollateralFactor;  // 清算抵押率 (例: 0.85e18 = 85%)
+        uint64 liquidateCollateralFactor;  // 清算抵押率
-        uint64 liquidationFactor;           // 清算激励 (例: 1.05e18 = 5%折扣)
+        uint64 liquidationFactor;           // 清算折扣
         uint128 supplyCap;                  // 供应上限
     }
 
     struct Configuration {
-        address baseToken;                              // 基础资产（借出的资产，如 USDC）
+        address baseToken;                              // 基础资产
         address baseTokenPriceFeed;                     // 基础资产价格预言机
         
         // 利率模型参数

contracts/ytLending/interfaces/ILending.sol

@@ -35,6 +35,7 @@ interface ILending {
     error InvalidBorrowCollateralFactor();
     error InvalidLiquidateCollateralFactor();
     error InsufficientReserves();
+    error NotForSale();
     
     // ========== Core Functions ==========
     

out/LendingConfiguration.sol/LendingConfiguration.json

@@ -1 +1 @@
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out/build-info/3727933aebc49b60.json

@@ -1 +1 @@
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out/build-info/5c8609e4d5730c4a.json

@@ -1 +1 @@
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+{"id":"5c8609e4d5730c4a","source_id_to_path":{"0":"contracts/ytLending/Configurator.sol","1":"contracts/ytLending/ConfiguratorStorage.sol","2":"contracts/ytLending/Lending.sol","3":"contracts/ytLending/LendingConfiguration.sol","4":"contracts/ytLending/LendingFactory.sol","5":"contracts/ytLending/LendingMath.sol","6":"contracts/ytLending/LendingStorage.sol","7":"contracts/ytLending/interfaces/ILending.sol","8":"contracts/ytLending/interfaces/IPriceFeed.sol","9":"lib/forge-std/src/Base.sol","10":"lib/forge-std/src/StdAssertions.sol","11":"lib/forge-std/src/StdChains.sol","12":"lib/forge-std/src/StdCheats.sol","13":"lib/forge-std/src/StdConstants.sol","14":"lib/forge-std/src/StdError.sol","15":"lib/forge-std/src/StdInvariant.sol","16":"lib/forge-std/src/StdJson.sol","17":"lib/forge-std/src/StdMath.sol","18":"lib/forge-std/src/StdStorage.sol","19":"lib/forge-std/src/StdStyle.sol","20":"lib/forge-std/src/StdToml.sol","21":"lib/forge-std/src/StdUtils.sol","22":"lib/forge-std/src/Test.sol","23":"lib/forge-std/src/Vm.sol","24":"lib/forge-std/src/console.sol","25":"lib/forge-std/src/console2.sol","26":"lib/forge-std/src/interfaces/IMulticall3.sol","27":"lib/forge-std/src/safeconsole.sol","28":"node_modules/@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol","29":"node_modules/@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol","30":"node_modules/@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol","31":"node_modules/@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol","32":"node_modules/@openzeppelin/contracts-upgradeable/utils/PausableUpgradeable.sol","33":"node_modules/@openzeppelin/contracts-upgradeable/utils/ReentrancyGuardUpgradeable.sol","34":"node_modules/@openzeppelin/contracts/access/Ownable.sol","35":"node_modules/@openzeppelin/contracts/interfaces/IERC1363.sol","36":"node_modules/@openzeppelin/contracts/interfaces/IERC165.sol","37":"node_modules/@openzeppelin/contracts/interfaces/IERC1967.sol","38":"node_modules/@openzeppelin/contracts/interfaces/IERC20.sol","39":"node_modules/@openzeppelin/contracts/interfaces/draft-IERC1822.sol","40":"node_modules/@openzeppelin/contracts/interfaces/draft-IERC6093.sol","41":"node_modules/@openzeppelin/contracts/proxy/ERC1967/ERC1967Proxy.sol","42":"node_modules/@openzeppelin/contracts/proxy/ERC1967/ERC1967Utils.sol","43":"node_modules/@openzeppelin/contracts/proxy/Proxy.sol","44":"node_modules/@openzeppelin/contracts/proxy/beacon/IBeacon.sol","45":"node_modules/@openzeppelin/contracts/token/ERC20/ERC20.sol","46":"node_modules/@openzeppelin/contracts/token/ERC20/IERC20.sol","47":"node_modules/@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol","48":"node_modules/@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol","49":"node_modules/@openzeppelin/contracts/utils/Address.sol","50":"node_modules/@openzeppelin/contracts/utils/Context.sol","51":"node_modules/@openzeppelin/contracts/utils/Errors.sol","52":"node_modules/@openzeppelin/contracts/utils/StorageSlot.sol","53":"node_modules/@openzeppelin/contracts/utils/introspection/IERC165.sol","54":"test/YtLending.t.sol"},"language":"Solidity"}

out/build-info/873f71b8338f0e7a.json

@@ -1 +0,0 @@
-{"id":"873f71b8338f0e7a","source_id_to_path":{"0":"contracts/ytLending/Configurator.sol","1":"contracts/ytLending/ConfiguratorStorage.sol","2":"contracts/ytLending/Lending.sol","3":"contracts/ytLending/LendingConfiguration.sol","4":"contracts/ytLending/LendingFactory.sol","5":"contracts/ytLending/LendingMath.sol","6":"contracts/ytLending/LendingStorage.sol","7":"contracts/ytLending/interfaces/ILending.sol","8":"contracts/ytLending/interfaces/IPriceFeed.sol","9":"lib/forge-std/src/Base.sol","10":"lib/forge-std/src/StdAssertions.sol","11":"lib/forge-std/src/StdChains.sol","12":"lib/forge-std/src/StdCheats.sol","13":"lib/forge-std/src/StdConstants.sol","14":"lib/forge-std/src/StdError.sol","15":"lib/forge-std/src/StdInvariant.sol","16":"lib/forge-std/src/StdJson.sol","17":"lib/forge-std/src/StdMath.sol","18":"lib/forge-std/src/StdStorage.sol","19":"lib/forge-std/src/StdStyle.sol","20":"lib/forge-std/src/StdToml.sol","21":"lib/forge-std/src/StdUtils.sol","22":"lib/forge-std/src/Test.sol","23":"lib/forge-std/src/Vm.sol","24":"lib/forge-std/src/console.sol","25":"lib/forge-std/src/console2.sol","26":"lib/forge-std/src/interfaces/IMulticall3.sol","27":"lib/forge-std/src/safeconsole.sol","28":"node_modules/@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol","29":"node_modules/@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol","30":"node_modules/@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol","31":"node_modules/@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol","32":"node_modules/@openzeppelin/contracts-upgradeable/utils/PausableUpgradeable.sol","33":"node_modules/@openzeppelin/contracts-upgradeable/utils/ReentrancyGuardUpgradeable.sol","34":"node_modules/@openzeppelin/contracts/access/Ownable.sol","35":"node_modules/@openzeppelin/contracts/interfaces/IERC1363.sol","36":"node_modules/@openzeppelin/contracts/interfaces/IERC165.sol","37":"node_modules/@openzeppelin/contracts/interfaces/IERC1967.sol","38":"node_modules/@openzeppelin/contracts/interfaces/IERC20.sol","39":"node_modules/@openzeppelin/contracts/interfaces/draft-IERC1822.sol","40":"node_modules/@openzeppelin/contracts/interfaces/draft-IERC6093.sol","41":"node_modules/@openzeppelin/contracts/proxy/ERC1967/ERC1967Proxy.sol","42":"node_modules/@openzeppelin/contracts/proxy/ERC1967/ERC1967Utils.sol","43":"node_modules/@openzeppelin/contracts/proxy/Proxy.sol","44":"node_modules/@openzeppelin/contracts/proxy/beacon/IBeacon.sol","45":"node_modules/@openzeppelin/contracts/token/ERC20/ERC20.sol","46":"node_modules/@openzeppelin/contracts/token/ERC20/IERC20.sol","47":"node_modules/@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol","48":"node_modules/@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol","49":"node_modules/@openzeppelin/contracts/utils/Address.sol","50":"node_modules/@openzeppelin/contracts/utils/Context.sol","51":"node_modules/@openzeppelin/contracts/utils/Errors.sol","52":"node_modules/@openzeppelin/contracts/utils/StorageSlot.sol","53":"node_modules/@openzeppelin/contracts/utils/introspection/IERC165.sol","54":"test/YtLending.t.sol"},"language":"Solidity"}

test/YtLending.t.sol

@@ -45,7 +45,7 @@ contract YtLendingTest is Test {
     uint64 constant SUPPLY_KINK = 0.8e18;                 // 80%
     uint64 constant SUPPLY_RATE_LOW = 0.03e18;            // 3% APY
     uint64 constant SUPPLY_RATE_HIGH = 0.4e18;            // 40% APY
-    uint64 constant SUPPLY_RATE_BASE = 0;
+    uint64 constant SUPPLY_RATE_BASE = 0;                 // 设置为0%，当没有借款时，存款人不获得利息
     
     uint64 constant BORROW_KINK = 0.8e18;                 // 80%
     uint64 constant BORROW_RATE_LOW = 0.05e18;            // 5% APY