- Added batch to credit delegation

contracts/interfaces/ILendingPool.sol

@@ -32,11 +32,11 @@ interface ILendingPool {
   event Withdraw(address indexed reserve, address indexed user, uint256 amount);
 
   event BorrowAllowanceDelegated(
-    address indexed asset,
     address indexed fromUser,
     address indexed toUser,
-    uint256 interestRateMode,
-    uint256 amount
+    address[] assets,
+    uint256[] interestRateModes,
+    uint256[] amounts
   );
   /**
    * @dev emitted on borrow
@@ -189,17 +189,17 @@ interface ILendingPool {
   function withdraw(address reserve, uint256 amount) external;
 
   /**
-   * @dev Sets allowance to borrow on a certain type of debt asset for a certain user address
-   * @param asset The underlying asset of the debt token
+   * @dev Sets allowance to borrow on a certain type of debt assets for a certain user address
+   * @param assets The underlying asset of each debt token
    * @param user The user to give allowance to
-   * @param interestRateMode Type of debt: 1 for stable, 2 for variable
-   * @param amount Allowance amount to borrow
+   * @param interestRateModes Types of debt: 1 for stable, 2 for variable
+   * @param amounts Allowance amounts to borrow
    **/
   function delegateBorrowAllowance(
-    address asset,
+    address[] calldata assets,
     address user,
-    uint256 interestRateMode,
-    uint256 amount
+    uint256[] calldata interestRateModes,
+    uint256[] calldata amounts
   ) external;
 
   function getBorrowAllowance(

contracts/lendingpool/LendingPool.sol

@@ -179,23 +179,32 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
   }
 
   /**
-   * @dev Sets allowance to borrow on a certain type of debt asset for a certain user address
-   * @param asset The underlying asset of the debt token
+   * @dev Sets allowance to borrow on a certain type of debt assets for a certain user address
+   * @param assets The underlying asset of each debt token
    * @param user The user to give allowance to
-   * @param interestRateMode Type of debt: 1 for stable, 2 for variable
-   * @param amount Allowance amount to borrow
+   * @param interestRateModes Types of debt: 1 for stable, 2 for variable
+   * @param amounts Allowance amounts to borrow
    **/
   function delegateBorrowAllowance(
-    address asset,
+    address[] calldata assets,
     address user,
-    uint256 interestRateMode,
-    uint256 amount
+    uint256[] calldata interestRateModes,
+    uint256[] calldata amounts
   ) external override {
     _whenNotPaused();
-    address debtToken = _reserves[asset].getDebtTokenAddress(interestRateMode);
 
-    _borrowAllowance[debtToken][msg.sender][user] = amount;
-    emit BorrowAllowanceDelegated(asset, msg.sender, user, interestRateMode, amount);
+    uint256 countAssets = assets.length;
+    require(
+      countAssets == interestRateModes.length && countAssets == amounts.length,
+      Errors.INCONSISTENT_PARAMS_LENGTH
+    );
+
+    for (uint256 i = 0; i < countAssets; i++) {
+      address debtToken = _reserves[assets[i]].getDebtTokenAddress(interestRateModes[i]);
+      _borrowAllowance[debtToken][msg.sender][user] = amounts[i];
+    }
+
+    emit BorrowAllowanceDelegated(msg.sender, user, assets, interestRateModes, amounts);
   }
 
   /**
@@ -913,7 +922,6 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
    * @dev adds a reserve to the array of the _reserves address
    **/
   function _addReserveToList(address asset) internal {
-
     uint256 reservesCount = _reservesCount;
 
     require(reservesCount < MAX_NUMBER_RESERVES, Errors.NO_MORE_RESERVES_ALLOWED);

contracts/libraries/helpers/Errors.sol

@@ -97,6 +97,9 @@ library Errors {
   string public constant INVALID_DECIMALS = '73';
   string public constant INVALID_RESERVE_FACTOR = '74';
 
+  // Credit delegation
+  string public constant INCONSISTENT_PARAMS_LENGTH = '75';
+
 
   enum CollateralManagerErrors {
     NO_ERROR,

test/helpers/actions.ts

@@ -279,9 +279,9 @@ export const withdraw = async (
 };
 
 export const delegateBorrowAllowance = async (
-  reserveSymbol: string,
-  amount: string,
-  interestRateMode: string,
+  reserveSymbols: string[],
+  amounts: string[],
+  interestRateModes: string[],
   user: SignerWithAddress,
   receiver: tEthereumAddress,
   expectedResult: string,
@@ -290,20 +290,27 @@ export const delegateBorrowAllowance = async (
 ) => {
   const {pool} = testEnv;
 
-  const reserve = await getReserveAddressFromSymbol(reserveSymbol);
-  const amountToDelegate = await convertToCurrencyDecimals(reserve, amount);
+  const reserves : tEthereumAddress[] = []
+  const amountsToDelegate: tEthereumAddress[] = []
+  for (const reserveSymbol of reserveSymbols) {
+    const newLength = reserves.push(await getReserveAddressFromSymbol(reserveSymbol))
+    amountsToDelegate.push(await (await convertToCurrencyDecimals(reserves[newLength-1], amounts[newLength-1])).toString())
+  }
 
   const delegateAllowancePromise = pool
     .connect(user.signer)
-    .delegateBorrowAllowance(reserve, receiver, interestRateMode, amountToDelegate.toString());
+    .delegateBorrowAllowance(reserves, receiver, interestRateModes, amountsToDelegate);
   if (expectedResult === 'revert') {
     await expect(delegateAllowancePromise, revertMessage).to.be.reverted;
     return;
   } else {
     await delegateAllowancePromise;
-    expect(
-      (await pool.getBorrowAllowance(user.address, receiver, reserve, interestRateMode)).toString()
-    ).to.be.equal(amountToDelegate.toString(), 'borrowAllowance are set incorrectly');
+    for (const [i, reserve] of reserves.entries()) {
+      expect(
+        (await pool.getBorrowAllowance(user.address, receiver, reserve, interestRateModes[i])).toString()
+      ).to.be.equal(amountsToDelegate[i], 'borrowAllowance are set incorrectly');
+    }
+    
   }
 };
 

test/helpers/scenario-engine.ts

@@ -121,9 +121,9 @@ const executeAction = async (action: Action, users: SignerWithAddress[], testEnv
         }
 
         await delegateBorrowAllowance(
-          reserve,
-          amount,
-          rateMode,
+          [reserve],
+          [amount],
+          [rateMode],
           user,
           toUser,
           expected,

test/pausable-functions.spec.ts

@@ -132,7 +132,7 @@ makeSuite('Pausable Pool', (testEnv: TestEnv) => {
 
     // Try to execute liquidation
     await expect(
-      pool.connect(user.signer).delegateBorrowAllowance(dai.address, toUser.address, '1', '1')
+      pool.connect(user.signer).delegateBorrowAllowance([dai.address], toUser.address, ['1'], ['1'])
     ).revertedWith(IS_PAUSED);
 
     // Unpause the pool