Merge pull request #1448 from morpho-dao/feat/increase-delta

Increase delta

README.md

@@ -76,9 +76,9 @@ You can also send an email to [[email protected]](mailto:[email protected])
 ### Morpho-Aave-V2 Ethereum
 
 - Morpho Proxy: [0x299ff2534c6f11624d6a65463b8b40c958ab668f](https://etherscan.io/address/0x299ff2534c6f11624d6a65463b8b40c958ab668f)
-- Morpho Implementation: [0x299ff2534c6f11624d6a65463b8b40c958ab668f](https://etherscan.io/address/0x299ff2534c6f11624d6a65463b8b40c958ab668f)
+- Morpho Implementation: [0x497897080d90bc0418f896f4bfcdddd06fe8a9ea](https://etherscan.io/address/0x497897080d90bc0418f896f4bfcdddd06fe8a9ea)
 - EntryPositionsManager: [0xdf93cf1ca3acf96bc26783e6fab89400d362d0b4](https://etherscan.io/address/0xdf93cf1ca3acf96bc26783e6fab89400d362d0b4)
-- ExitPositionsManager: [0xf6998f72b92b81c8f683d30ed8678d348fe9754b](https://etherscan.io/address/0xf6998f72b92b81c8f683d30ed8678d348fe9754b)
+- ExitPositionsManager: [0x51ae58e71fed9b1162810898bbd68301206786b2](https://etherscan.io/address/0x51ae58e71fed9b1162810898bbd68301206786b2)
 - InterestRatesManager: [0x91b23044d4a8089670309852c7f0a93e5ca8efb7](https://etherscan.io/address/0x91b23044d4a8089670309852c7f0a93e5ca8efb7)
 - Lens Proxy: [0x507fa343d0a90786d86c7cd885f5c49263a91ff4](https://etherscan.io/address/0x507fa343d0a90786d86c7cd885f5c49263a91ff4)
 - Lens: [0x8706256509684e9cd93b7f19254775ce9324c226](https://etherscan.io/address/0x8706256509684e9cd93b7f19254775ce9324c226)

contracts/aave-v2/ExitPositionsManager.sol

@@ -67,6 +67,11 @@ contract ExitPositionsManager is IExitPositionsManager, PositionsManagerUtils {
         uint256 _amountSeized
     );
 
+    /// @notice Emitted when the peer-to-peer deltas are increased by the governance.
+    /// @param _poolToken The address of the market on which the deltas were increased.
+    /// @param _amount The amount that has been added to the deltas (in underlying).
+    event P2PDeltasIncreased(address indexed _poolToken, uint256 _amount);
+
     /// ERRORS ///
 
     /// @notice Thrown when user is not a member of the market.
@@ -250,6 +255,45 @@ contract ExitPositionsManager is IExitPositionsManager, PositionsManagerUtils {
         );
     }
 
+    /// @notice Implements increaseP2PDeltas logic.
+    /// @dev The current Morpho supply on the pool might not be enough to borrow `_amount` before resupplying it.
+    /// In this case, consider calling this function multiple times.
+    /// @param _poolToken The address of the market on which to increase deltas.
+    /// @param _amount The maximum amount to add to the deltas (in underlying).
+    function increaseP2PDeltasLogic(address _poolToken, uint256 _amount)
+        external
+        isMarketCreated(_poolToken)
+    {
+        _updateIndexes(_poolToken);
+
+        Types.Delta storage deltas = deltas[_poolToken];
+        Types.PoolIndexes memory poolIndexes = poolIndexes[_poolToken];
+
+        _amount = Math.min(
+            _amount,
+            Math.min(
+                deltas.p2pSupplyAmount.rayMul(p2pSupplyIndex[_poolToken]).zeroFloorSub(
+                    deltas.p2pSupplyDelta.rayMul(poolIndexes.poolSupplyIndex)
+                ),
+                deltas.p2pBorrowAmount.rayMul(p2pBorrowIndex[_poolToken]).zeroFloorSub(
+                    deltas.p2pBorrowDelta.rayMul(poolIndexes.poolBorrowIndex)
+                )
+            )
+        );
+        if (_amount == 0) revert AmountIsZero();
+
+        deltas.p2pSupplyDelta += _amount.rayDiv(poolIndexes.poolSupplyIndex);
+        deltas.p2pBorrowDelta += _amount.rayDiv(poolIndexes.poolBorrowIndex);
+        emit P2PSupplyDeltaUpdated(_poolToken, deltas.p2pSupplyDelta);
+        emit P2PBorrowDeltaUpdated(_poolToken, deltas.p2pBorrowDelta);
+
+        ERC20 underlyingToken = ERC20(market[_poolToken].underlyingToken);
+        _borrowFromPool(underlyingToken, _amount);
+        _supplyToPool(underlyingToken, _amount);
+
+        emit P2PDeltasIncreased(_poolToken, _amount);
+    }
+
     /// INTERNAL ///
 
     /// @dev Implements withdraw logic without security checks.

contracts/aave-v2/MorphoGovernance.sol

@@ -13,6 +13,7 @@ abstract contract MorphoGovernance is MorphoUtils {
     using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
     using PercentageMath for uint256;
     using SafeTransferLib for ERC20;
+    using DelegateCall for address;
     using WadRayMath for uint256;
 
     /// EVENTS ///
@@ -327,6 +328,21 @@ abstract contract MorphoGovernance is MorphoUtils {
         pool.setUserUseReserveAsCollateral(market[_poolToken].underlyingToken, _newStatus);
     }
 
+    /// @notice Increases peer-to-peer deltas, to put some liquidity back on the pool.
+    /// @dev The current Morpho supply on the pool might not be enough to borrow `_amount` before resuppling it.
+    /// In this case, consider calling multiple times this function.
+    /// @param _poolToken The address of the market on which to increase deltas.
+    /// @param _amount The maximum amount to add to the deltas (in underlying).
+    function increaseP2PDeltas(address _poolToken, uint256 _amount) external onlyOwner {
+        address(exitPositionsManager).functionDelegateCall(
+            abi.encodeWithSelector(
+                IExitPositionsManager.increaseP2PDeltasLogic.selector,
+                _poolToken,
+                _amount
+            )
+        );
+    }
+
     /// @notice Transfers the protocol reserve fee to the DAO.
     /// @param _poolTokens The addresses of the pool token addresses on which to claim the reserve fee.
     /// @param _amounts The list of amounts of underlying tokens to claim on each market.

contracts/aave-v2/interfaces/IExitPositionsManager.sol

@@ -24,4 +24,6 @@ interface IExitPositionsManager {
         address _borrower,
         uint256 _amount
     ) external;
+
+    function increaseP2PDeltasLogic(address _poolToken, uint256 _amount) external;
 }

contracts/aave-v2/interfaces/IMorpho.sol

@@ -76,6 +76,7 @@ interface IMorpho {
     function setInterestRatesManager(IInterestRatesManager _interestRatesManager) external;
     function claimToTreasury(address[] calldata _poolTokens, uint256[] calldata _amounts) external;
     function createMarket(address _underlyingToken, uint16 _reserveFactor, uint16 _p2pIndexCursor) external;
+    function increaseP2PDeltas(address _poolToken, uint256 _amount) external;
 
     /// USERS ///
 

contracts/aave-v2/interfaces/aave/IVariableDebtToken.sol

@@ -69,4 +69,10 @@ interface IVariableDebtToken is IScaledBalanceToken {
         uint256 amount,
         uint256 index
     ) external;
+
+    /**
+     * @dev Returns the debt balance of the user
+     * @return The debt balance of the user.
+     **/
+    function balanceOf(address user) external view returns (uint256);
 }