H-05, M-05, N-21 (OZ Audit)

src/oracles/reserve/ReserveOracle.sol

@@ -8,6 +8,7 @@ import { WadRayMath } from "src/libraries/math/WadRayMath.sol";
 
 // should equal to the number of feeds available in the contract
 uint8 constant MAX_FEED_COUNT = 3;
+uint256 constant UPDATE_COOLDOWN = 1 hours;
 
 abstract contract ReserveOracle {
     using SafeCast for *;
@@ -22,6 +23,7 @@ abstract contract ReserveOracle {
     IReserveFeed public immutable FEED2;
 
     uint256 public currentExchangeRate; // [wad] the bounded queried last time
+    uint256 public lastUpdated; // [wad] the bounded queried last time
 
     // --- Events ---
     event UpdateExchangeRate(uint256 exchangeRate);
@@ -30,6 +32,7 @@ abstract contract ReserveOracle {
     error InvalidQuorum(uint8 quorum);
     error InvalidFeedLength(uint256 length);
     error InvalidInitialization(uint256 exchangeRate);
+    error UpdateCooldown(uint256 lastUpdated);
 
     // --- Override ---
     function _getProtocolExchangeRate() internal view virtual returns (uint256);
@@ -93,6 +96,8 @@ abstract contract ReserveOracle {
     // then bounds it up to the maximum change and writes the bounded value to the state.
     // NOTE: keepers should call this update to reflect recent values
     function updateExchangeRate() public {
+        if (block.timestamp - lastUpdated < UPDATE_COOLDOWN) revert UpdateCooldown(lastUpdated);
+
         uint256 _currentExchangeRate = currentExchangeRate;
 
         uint256 minimum = Math.min(_getProtocolExchangeRate(), _aggregate(ILK_INDEX));
@@ -101,6 +106,8 @@ abstract contract ReserveOracle {
         uint256 bounded = _bound(minimum, _currentExchangeRate - diff, _currentExchangeRate + diff);
         currentExchangeRate = bounded;
 
+        lastUpdated = block.timestamp;
+
         emit UpdateExchangeRate(bounded);
     }
 }

src/oracles/spot/EthXSpotOracle.sol

@@ -7,7 +7,10 @@ import { IChainlink } from "src/interfaces/IChainlink.sol";
 import { WadRayMath } from "src/libraries/math/WadRayMath.sol";
 
 interface IRedstonePriceFeed {
-    function latestAnswer() external view returns (int256 answer);
+    function latestRoundData()
+        external
+        view
+        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);
 }
 
 uint8 constant REDSTONE_DECIMALS = 8;
@@ -31,15 +34,16 @@ contract EthXSpotOracle is SpotOracle {
         USD_PER_ETH_CHAINLINK = IChainlink(_usdPerEthChainlink);
     }
 
-    // @notice Gets the price of ETHx in ETH. 
+    // @notice Gets the price of ETHx in ETH.
     // @dev redstone oracle returns dollar value per ETHx with 6 decimals.
     // This needs to be converted to [wad] and to ETH denomination.
-    // @return ethPerEthX price of ETHx in ETH [wad] 
+    // @return ethPerEthX price of ETHx in ETH [wad]
     function getPrice() public view override returns (uint256 ethPerEthX) {
         // get price from the protocol feed
         // usd per ETHx
+        (, int256 answer,,,) = REDSTONE_ETHX_PRICE_FEED.latestRoundData();
 
-        uint256 usdPerEthX = uint256(REDSTONE_ETHX_PRICE_FEED.latestAnswer()).scaleUpToWad(REDSTONE_DECIMALS); //
+        uint256 usdPerEthX = uint256(answer).scaleUpToWad(REDSTONE_DECIMALS); //
 
         // usd per ETH
         (, int256 _usdPerEth,,,) = USD_PER_ETH_CHAINLINK.latestRoundData(); // price of stETH denominated in ETH

test/fork/concrete/EthXReserveOracleFork.t.sol

@@ -5,13 +5,33 @@ import { EthXReserveOracle } from "src/oracles/reserve/EthXReserveOracle.sol";
 import { ReserveFeed } from "src/oracles/reserve/ReserveFeed.sol";
 import { IStaderStakePoolsManager } from "src/interfaces/ProviderInterfaces.sol";
 import { WadRayMath, RAY } from "src/libraries/math/WadRayMath.sol";
+import { ReserveOracle } from "../../../src/oracles/reserve/ReserveOracle.sol";
+
 import { ReserveOracleSharedSetup } from "test/helpers/ReserveOracleSharedSetup.sol";
 
 contract EthXReserveOracleForkTest is ReserveOracleSharedSetup {
     using WadRayMath for *;
 
     // --- ETHx Reserve Oracle Test ---
 
+    function test_RevertWhen_UpdateIsOnCooldown() public {
+        uint256 maxChange = 3e25; // 0.03 3%
+        address[] memory feeds = new address[](3);
+        uint8 quorum = 0;
+        EthXReserveOracle ethXReserveOracle = new EthXReserveOracle(
+            STADER_STAKE_POOLS_MANAGER,
+            ETHX_ILK_INDEX,
+            feeds,
+            quorum,
+            maxChange
+        );
+
+        ethXReserveOracle.updateExchangeRate();
+
+        vm.expectRevert(abi.encodeWithSelector(ReserveOracle.UpdateCooldown.selector, block.timestamp));
+        ethXReserveOracle.updateExchangeRate();
+    }
+
     function test_EthXReserveOracleGetProtocolExchangeRate() public {
         uint256 maxChange = 3e25; // 0.03 3%
         address[] memory feeds = new address[](3);

test/fork/concrete/SwEthReserveOracleFork.t.sol

@@ -5,11 +5,31 @@ import { SwEthReserveOracle } from "src/oracles/reserve/SwEthReserveOracle.sol";
 import { ReserveFeed } from "src/oracles/reserve/ReserveFeed.sol";
 import { ISwEth } from "src/interfaces/ProviderInterfaces.sol";
 import { RAY } from "src/libraries/math/WadRayMath.sol";
+import { ReserveOracle } from "../../../src/oracles/reserve/ReserveOracle.sol";
+
 import { ReserveOracleSharedSetup } from "test/helpers/ReserveOracleSharedSetup.sol";
 
 contract SwEthReserveOracleForkTest is ReserveOracleSharedSetup {
     // --- swETH Reserve Oracle Test ---
 
+    function test_RevertWhen_UpdateIsOnCooldown() public {
+        uint256 maxChange = 3e25; // 0.03 3%
+        address[] memory feeds = new address[](3);
+        uint8 quorum = 0;
+        SwEthReserveOracle swEthReserveOracle = new SwEthReserveOracle(
+            SWETH,
+            SWETH_ILK_INDEX, 
+            feeds, 
+            quorum,
+            maxChange
+        );
+
+        swEthReserveOracle.updateExchangeRate();
+
+        vm.expectRevert(abi.encodeWithSelector(ReserveOracle.UpdateCooldown.selector, block.timestamp));
+        swEthReserveOracle.updateExchangeRate();
+    }
+
     function test_SwEthReserveOracleGetProtocolExchangeRate() public {
         uint256 maxChange = 3e25; // 0.03 3%
         uint8 quorum = 0;

test/fork/concrete/WstEthReserveOracleFork.t.sol

@@ -13,6 +13,19 @@ import { ReserveOracleSharedSetup } from "test/helpers/ReserveOracleSharedSetup.
 contract WstEthReserveOracleForkTest is ReserveOracleSharedSetup {
     // --- stETH Reserve Oracle Test ---
 
+    function test_RevertWhen_UpdateIsOnCooldown() public {
+        uint256 maxChange = 3e25; // 0.03 3%
+        address[] memory feeds = new address[](3);
+        uint8 quorum = 0;
+        WstEthReserveOracle wstEthReserveOracle =
+            new WstEthReserveOracle(WSTETH, STETH_ILK_INDEX, feeds, quorum, maxChange);
+
+        wstEthReserveOracle.updateExchangeRate();
+
+        vm.expectRevert(abi.encodeWithSelector(ReserveOracle.UpdateCooldown.selector, block.timestamp));
+        wstEthReserveOracle.updateExchangeRate();
+    }
+
     function test_WstEthReserveOracleGetProtocolExchangeRate() public {
         uint256 maxChange = 3e25; // 0.03 3%
         address[] memory feeds = new address[](3);