feat: price updates in batch liquidator

Author: doomsower

contracts/BatchLiquidator.sol

@@ -8,16 +8,23 @@ import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
 import {SafeERC20} from "@1inch/solidity-utils/contracts/libraries/SafeERC20.sol";
 
 import {IRouterV3, RouterResult} from "./interfaces/IRouterV3.sol";
-import {IBatchLiquidator, RouterLiqParams, LiquidationResult, LiqParams} from "./interfaces/IBatchLiquidator.sol";
+import {
+    IBatchLiquidator,
+    RouterLiqParams,
+    LiquidationResult,
+    LiqParams,
+    PriceUpdate
+} from "./interfaces/IBatchLiquidator.sol";
 import {ICreditAccountV3} from "@gearbox-protocol/core-v3/contracts/interfaces/ICreditAccountV3.sol";
 import {ICreditManagerV3} from "@gearbox-protocol/core-v3/contracts/interfaces/ICreditManagerV3.sol";
 import {ICreditFacadeV3} from "@gearbox-protocol/core-v3/contracts/interfaces/ICreditFacadeV3.sol";
 import {IPriceOracleV3} from "@gearbox-protocol/core-v3/contracts/interfaces/IPriceOracleV3.sol";
 import {ICreditFacadeV3Multicall} from "@gearbox-protocol/core-v3/contracts/interfaces/ICreditFacadeV3Multicall.sol";
 import {MultiCall, MultiCallOps} from "@gearbox-protocol/core-v2/contracts/libraries/MultiCall.sol";
 import {Balance} from "@gearbox-protocol/core-v2/contracts/libraries/Balances.sol";
+import {IUpdatablePriceFeed} from "@gearbox-protocol/core-v2/contracts/interfaces/IPriceFeed.sol";
 
-contract BatchLiquidator is IBatchLiquidator, Ownable {
+contract BatchLiquidator is Ownable {
     using SafeERC20 for IERC20;
     using MultiCallOps for MultiCall[];
 
@@ -47,6 +54,8 @@ contract BatchLiquidator is IBatchLiquidator, Ownable {
         results = new LiquidationResult[](len);
 
         for (uint256 i = 0; i < len;) {
+            _applyOnDemandPriceUpdates(params[i].creditAccount, params[i].priceUpdates);
+
             results[i].creditAccount = params[i].creditAccount;
 
             (bool pathSuccess, RouterResult memory res) = _findBestClosePath(params[i]);
@@ -120,6 +129,24 @@ contract BatchLiquidator is IBatchLiquidator, Ownable {
         underlying = ICreditManagerV3(creditManager).underlying();
     }
 
+    function _getPriceOracle(address creditAccount) internal view returns (address priceOracle) {
+        address creditManager = ICreditAccountV3(creditAccount).creditManager();
+        priceOracle = ICreditManagerV3(creditManager).priceOracle();
+    }
+
+    /// @dev Applies on-demand price feed updates, reverts if trying to update unknown price feeds
+    function _applyOnDemandPriceUpdates(address creditAccount, PriceUpdate[] calldata priceUpdates) internal {
+        address priceOracle = _getPriceOracle(creditAccount);
+
+        uint256 len = priceUpdates.length;
+        for (uint256 i; i < len; ++i) {
+            PriceUpdate calldata update = priceUpdates[i];
+            address priceFeed = IPriceOracleV3(priceOracle).priceFeedsRaw(update.token, update.reserve);
+            if (priceFeed == address(0)) revert("Price feed does not exist");
+            IUpdatablePriceFeed(priceFeed).updatePrice(update.data);
+        }
+    }
+
     function setWhitelistedStatus(address account, bool status) external onlyOwner {
         if (isWhitelisted[account] != status) {
             isWhitelisted[account] = status;

contracts/interfaces/IBatchLiquidator.sol

@@ -7,6 +7,12 @@ import {Balance} from "@gearbox-protocol/core-v2/contracts/libraries/Balances.so
 import {MultiCall} from "@gearbox-protocol/core-v2/contracts/libraries/MultiCall.sol";
 import {PathOption} from "./IRouterV3.sol";
 
+struct PriceUpdate {
+    address token;
+    bool reserve;
+    bytes data;
+}
+
 struct RouterLiqParams {
     address creditAccount;
     Balance[] expectedBalances;
@@ -16,6 +22,7 @@ struct RouterLiqParams {
     PathOption[] pathOptions;
     uint256 iterations;
     bool force;
+    PriceUpdate[] priceUpdates;
 }
 
 struct LiqParams {