Updated price oracle sentinel interface

contracts/interfaces/ISequencerOracle.sol

@@ -9,8 +9,21 @@ pragma solidity 0.8.10;
 interface ISequencerOracle {
   /**
    * @notice Returns the health status of the sequencer.
-   * @return True if the sequencer is down, false otherwise
-   * @return The timestamp of last time the sequencer got up
+   * @return roundId The round ID from the aggregator for which the data was retrieved combined with a phase to ensure
+   * that round IDs get larger as time moves forward.
+   * @return answer The answer for the latest round: 0 if the sequencer is up, 1 if it is down.
+   * @return startedAt The timestamp when the round was started.
+   * @return updatedAt The timestamp of the block in which the answer was updated on L1.
+   * @return answeredInRound The round ID of the round in which the answer was computed.
    */
-  function latestAnswer() external view returns (bool, uint256);
+  function latestRoundData()
+    external
+    view
+    returns (
+      uint80 roundId,
+      int256 answer,
+      uint256 startedAt,
+      uint256 updatedAt,
+      uint80 answeredInRound
+    );
 }

contracts/mocks/oracle/SequencerOracle.sol

@@ -27,7 +27,22 @@ contract SequencerOracle is ISequencerOracle, Ownable {
   }
 
   /// @inheritdoc ISequencerOracle
-  function latestAnswer() external view override returns (bool, uint256) {
-    return (_isDown, _timestampGotUp);
+  function latestRoundData()
+    external
+    view
+    override
+    returns (
+      uint80 roundId,
+      int256 answer,
+      uint256 startedAt,
+      uint256 updatedAt,
+      uint80 answeredInRound
+    )
+  {
+    int256 isDown;
+    if (_isDown) {
+      isDown = 1;
+    }
+    return (0, isDown, 0, _timestampGotUp, 0);
   }
 }

contracts/protocol/configuration/PriceOracleSentinel.sol

@@ -73,8 +73,8 @@ contract PriceOracleSentinel is IPriceOracleSentinel {
    * @return True if the SequencerOracle is up and the grace period passed, false otherwise
    */
   function _isUpAndGracePeriodPassed() internal view returns (bool) {
-    (bool isDown, uint256 timestampGotUp) = _sequencerOracle.latestAnswer();
-    return !isDown && block.timestamp - timestampGotUp > _gracePeriod;
+    (, int256 answer, , uint256 lastUpdateTimestamp, ) = _sequencerOracle.latestRoundData();
+    return answer == 0 && block.timestamp - lastUpdateTimestamp > _gracePeriod;
   }
 
   /// @inheritdoc IPriceOracleSentinel

test-suites/price-oracle-sentinel.spec.ts

@@ -70,9 +70,9 @@ makeSuite('PriceOracleSentinel', (testEnv: TestEnv) => {
 
     expect(await addressesProvider.getPriceOracleSentinel()).to.be.eq(priceOracleSentinel.address);
 
-    const answer = await sequencerOracle.latestAnswer();
-    expect(answer[0]).to.be.eq(false);
+    const answer = await sequencerOracle.latestRoundData();
     expect(answer[1]).to.be.eq(0);
+    expect(answer[3]).to.be.eq(0);
   });
 
   it('Pooladmin updates grace period for sentinel', async () => {
@@ -212,8 +212,8 @@ makeSuite('PriceOracleSentinel', (testEnv: TestEnv) => {
     const userGlobalData = await pool.getUserAccountData(borrower.address);
 
     expect(userGlobalData.healthFactor).to.be.lt(utils.parseUnits('1', 18), INVALID_HF);
-    const currAnswer = await sequencerOracle.latestAnswer();
-    waitForTx(await sequencerOracle.setAnswer(true, currAnswer[1]));
+    const currAnswer = await sequencerOracle.latestRoundData();
+    waitForTx(await sequencerOracle.setAnswer(true, currAnswer[3]));
   });
 
   it('Tries to liquidate borrower when sequencer is down (HF > 0.95) (revert expected)', async () => {
@@ -431,8 +431,8 @@ makeSuite('PriceOracleSentinel', (testEnv: TestEnv) => {
   });
 
   it('Turn off sequencer + increase time more than grace period', async () => {
-    const currAnswer = await sequencerOracle.latestAnswer();
-    await waitForTx(await sequencerOracle.setAnswer(true, currAnswer[1]));
+    const currAnswer = await sequencerOracle.latestRoundData();
+    await waitForTx(await sequencerOracle.setAnswer(true, currAnswer[3]));
     await increaseTime(GRACE_PERIOD.mul(2).toNumber());
   });