[Adapter] feat: add Adapter::unlockTime and Adapter::currentTime func…

…tions

src/adapters/Adapter.sol

@@ -20,6 +20,10 @@ interface Adapter is IERC165 {
 
     function unlockMaturity(uint256 unlockID) external view returns (uint256);
 
+    function unlockTime() external view returns (uint256);
+
+    function currentTime() external view returns (uint256);
+
     function stake(address validator, uint256 amount) external;
 
     function unstake(address validator, uint256 amount) external returns (uint256 unlockID);

src/adapters/GraphAdapter.sol

@@ -92,6 +92,14 @@ contract GraphAdapter is Adapter {
         }
     }
 
+    function unlockTime() external view override returns (uint256) {
+        return GRAPH.thawingPeriod();
+    }
+
+    function currentTime() external view override returns (uint256) {
+        return block.number;
+    }
+
     function stake(address validator, uint256 amount) external override {
         GRT.safeApprove(address(GRAPH), amount);
         GRAPH.delegate(validator, amount);

src/adapters/LivepeerAdapter.sol

@@ -79,6 +79,14 @@ contract LivepeerAdapter is Adapter {
         }
     }
 
+    function unlockTime() external view override returns (uint256) {
+        return LIVEPEER_ROUNDS.roundLength() * LIVEPEER.unbondingPeriod();
+    }
+
+    function currentTime() external view override returns (uint256) {
+        return block.number;
+    }
+
     function stake(address validator, uint256 amount) public {
         LPT.approve(address(LIVEPEER), amount);
         LIVEPEER.bond(amount, validator);

src/adapters/PolygonAdapter.sol

@@ -77,6 +77,14 @@ contract PolygonAdapter is Adapter {
         return u.withdrawEpoch + WITHDRAW_DELAY;
     }
 
+    function unlockTime() external pure override returns (uint256) {
+        return WITHDRAW_DELAY;
+    }
+
+    function currentTime() external view override returns (uint256) {
+        return MATIC_STAKE_MANAGER.epoch();
+    }
+
     function stake(address validator, uint256 amount) external override {
         // approve tokens
         POLY.safeApprove(address(MATIC_STAKE_MANAGER), amount);

src/adapters/interfaces/ILivepeer.sol

@@ -46,6 +46,8 @@ interface ILivepeerBondingManager {
         returns (uint256 amount, uint256 withdrawRound);
 
     function isRegisteredTranscoder(address _transcoder) external view returns (bool);
+
+    function unbondingPeriod() external view returns (uint256);
 }
 
 interface ILivepeerRoundsManager {

src/adapters/interfaces/IPolygon.sol

@@ -12,6 +12,7 @@ struct DelegatorUnbond {
 interface IMaticStakeManager {
     function getValidatorId(address user) external view returns (uint256);
     function getValidatorContract(uint256 validatorId) external view returns (address);
+    function epoch() external view returns (uint256);
 }
 
 interface IValidatorShares {