Add custom errors for ConstantsManager (#75)

Author: Mike-CZ

contracts/sfc/ConstantsManager.sol

@@ -1,8 +1,8 @@
 // SPDX-License-Identifier: UNLICENSED
 pragma solidity ^0.8.9;
 
-import "../ownership/Ownable.sol";
-import "../common/Decimal.sol";
+import {Ownable} from "../ownership/Ownable.sol";
+import {Decimal} from "../common/Decimal.sol";
 
 contract ConstantsManager is Ownable {
     // Minimum amount of stake for a validator, i.e., 500000 FTM
@@ -32,94 +32,158 @@ contract ConstantsManager is Ownable {
     uint256 public targetGasPowerPerSecond;
     uint256 public gasPriceBalancingCounterweight;
 
+    /**
+     * @dev Given value is too small
+     */
+    error ValueTooSmall();
+
+    /**
+     * @dev Given value is too large
+     */
+    error ValueTooLarge();
+
     function initialize() external initializer {
         Ownable.initialize(msg.sender);
     }
 
     function updateMinSelfStake(uint256 v) external virtual onlyOwner {
-        require(v >= 100000 * 1e18, "too small value");
-        require(v <= 10000000 * 1e18, "too large value");
+        if (v < 100000 * 1e18) {
+            revert ValueTooSmall();
+        }
+        if (v > 10000000 * 1e18) {
+            revert ValueTooLarge();
+        }
         minSelfStake = v;
     }
 
     function updateMaxDelegatedRatio(uint256 v) external virtual onlyOwner {
-        require(v >= Decimal.unit(), "too small value");
-        require(v <= 31 * Decimal.unit(), "too large value");
+        if (v < Decimal.unit()) {
+            revert ValueTooSmall();
+        }
+        if (v > 31 * Decimal.unit()) {
+            revert ValueTooLarge();
+        }
         maxDelegatedRatio = v;
     }
 
     function updateValidatorCommission(uint256 v) external virtual onlyOwner {
-        require(v <= Decimal.unit() / 2, "too large value");
+        if (v > Decimal.unit() / 2) {
+            revert ValueTooLarge();
+        }
         validatorCommission = v;
     }
 
     function updateBurntFeeShare(uint256 v) external virtual onlyOwner {
-        require(v <= Decimal.unit() / 2, "too large value");
+        if (v > Decimal.unit() / 2) {
+            revert ValueTooLarge();
+        }
         burntFeeShare = v;
     }
 
     function updateTreasuryFeeShare(uint256 v) external virtual onlyOwner {
-        require(v <= Decimal.unit() / 2, "too large value");
+        if (v > Decimal.unit() / 2) {
+            revert ValueTooLarge();
+        }
         treasuryFeeShare = v;
     }
 
     function updateUnlockedRewardRatio(uint256 v) external virtual onlyOwner {
-        require(v >= (5 * Decimal.unit()) / 100, "too small value");
-        require(v <= Decimal.unit() / 2, "too large value");
+        if (v < (5 * Decimal.unit()) / 100) {
+            revert ValueTooSmall();
+        }
+        if (v > Decimal.unit() / 2) {
+            revert ValueTooLarge();
+        }
         unlockedRewardRatio = v;
     }
 
     function updateMinLockupDuration(uint256 v) external virtual onlyOwner {
-        require(v >= 86400, "too small value");
-        require(v <= 86400 * 30, "too large value");
+        if (v < 86400) {
+            revert ValueTooSmall();
+        }
+        if (v > 86400 * 30) {
+            revert ValueTooLarge();
+        }
         minLockupDuration = v;
     }
 
     function updateMaxLockupDuration(uint256 v) external virtual onlyOwner {
-        require(v >= 86400 * 30, "too small value");
-        require(v <= 86400 * 1460, "too large value");
+        if (v < 86400 * 30) {
+            revert ValueTooSmall();
+        }
+        if (v > 86400 * 1460) {
+            revert ValueTooLarge();
+        }
         maxLockupDuration = v;
     }
 
     function updateWithdrawalPeriodEpochs(uint256 v) external virtual onlyOwner {
-        require(v >= 2, "too small value");
-        require(v <= 100, "too large value");
+        if (v < 2) {
+            revert ValueTooSmall();
+        }
+        if (v > 100) {
+            revert ValueTooLarge();
+        }
         withdrawalPeriodEpochs = v;
     }
 
     function updateWithdrawalPeriodTime(uint256 v) external virtual onlyOwner {
-        require(v >= 86400, "too small value");
-        require(v <= 30 * 86400, "too large value");
+        if (v < 86400) {
+            revert ValueTooSmall();
+        }
+        if (v > 30 * 86400) {
+            revert ValueTooLarge();
+        }
         withdrawalPeriodTime = v;
     }
 
     function updateBaseRewardPerSecond(uint256 v) external virtual onlyOwner {
-        require(v >= 0.5 * 1e18, "too small value");
-        require(v <= 32 * 1e18, "too large value");
+        if (v < 0.5 * 1e18) {
+            revert ValueTooSmall();
+        }
+        if (v > 32 * 1e18) {
+            revert ValueTooLarge();
+        }
         baseRewardPerSecond = v;
     }
 
     function updateOfflinePenaltyThresholdTime(uint256 v) external virtual onlyOwner {
-        require(v >= 86400, "too small value");
-        require(v <= 10 * 86400, "too large value");
+        if (v < 86400) {
+            revert ValueTooSmall();
+        }
+        if (v > 10 * 86400) {
+            revert ValueTooLarge();
+        }
         offlinePenaltyThresholdTime = v;
     }
 
     function updateOfflinePenaltyThresholdBlocksNum(uint256 v) external virtual onlyOwner {
-        require(v >= 100, "too small value");
-        require(v <= 1000000, "too large value");
+        if (v < 100) {
+            revert ValueTooSmall();
+        }
+        if (v > 1000000) {
+            revert ValueTooLarge();
+        }
         offlinePenaltyThresholdBlocksNum = v;
     }
 
     function updateTargetGasPowerPerSecond(uint256 v) external virtual onlyOwner {
-        require(v >= 1000000, "too small value");
-        require(v <= 500000000, "too large value");
+        if (v < 1000000) {
+            revert ValueTooSmall();
+        }
+        if (v > 500000000) {
+            revert ValueTooLarge();
+        }
         targetGasPowerPerSecond = v;
     }
 
     function updateGasPriceBalancingCounterweight(uint256 v) external virtual onlyOwner {
-        require(v >= 100, "too small value");
-        require(v <= 10 * 86400, "too large value");
+        if (v < 100) {
+            revert ValueTooSmall();
+        }
+        if (v > 10 * 86400) {
+            revert ValueTooLarge();
+        }
         gasPriceBalancingCounterweight = v;
     }
 }

contracts/sfc/GasPriceConstants.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: UNLICENSED
 pragma solidity ^0.8.9;
 
-import "../common/Decimal.sol";
+import {Decimal} from "../common/Decimal.sol";
 
 library GP {
     function trimGasPriceChangeRatio(uint256 x) internal pure returns (uint256) {