Add Parameter for all contract settable variable

contracts/Airdropper.sol

@@ -8,7 +8,9 @@ import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
 import '@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol';
 import '@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol';
 
-contract Airdropper is Initializable, OwnableUpgradeable {
+import './interfaces/IParameter.sol';
+
+contract Airdropper is Initializable, OwnableUpgradeable, IParameter {
     using SafeERC20 for IERC20;
     // -- Data --
 
@@ -53,6 +55,7 @@ contract Airdropper is Initializable, OwnableUpgradeable {
 
     function setSettleDestination(address _settleDestination) external onlyOwner {
         settleDestination = _settleDestination;
+        emit Parameter('settleDestination', abi.encodePacked(settleDestination));
     }
 
     function addController(address controller) external onlyOwner {

contracts/ConsumerHost.sol

@@ -15,6 +15,7 @@ import './interfaces/IConsumer.sol';
 import './interfaces/IEraManager.sol';
 import './interfaces/ISettings.sol';
 import './interfaces/IConsumerRegistry.sol';
+import './interfaces/IParameter.sol';
 
 /**
  * @title Consumer Host Contract
@@ -25,7 +26,7 @@ import './interfaces/IConsumerRegistry.sol';
  * Other contracts can verify the consumer and safeTransfer SQT.
  *
  */
-contract ConsumerHost is Initializable, OwnableUpgradeable, IConsumer, ERC165 {
+contract ConsumerHost is Initializable, OwnableUpgradeable, IConsumer, ERC165, IParameter {
     using SafeERC20 for IERC20;
 
     // -- Structs --
@@ -109,6 +110,7 @@ contract ConsumerHost is Initializable, OwnableUpgradeable, IConsumer, ERC165 {
         __Ownable_init();
         settings = _settings;
         feePerMill = _feePerMill;
+        emit Parameter('feePerMill', abi.encodePacked(feePerMill));
 
         // Approve Token to State Channel.
         IERC20 sqt = IERC20(_sqt);
@@ -130,6 +132,8 @@ contract ConsumerHost is Initializable, OwnableUpgradeable, IConsumer, ERC165 {
     function setFeeRate(uint256 _feePerMill) external onlyOwner {
         require(_feePerMill <= PER_MILL, 'C001');
         feePerMill = _feePerMill;
+
+        emit Parameter('feePerMill', abi.encodePacked(feePerMill));
     }
 
     /**

contracts/DisputeManager.sol

@@ -13,8 +13,9 @@ import './interfaces/ISettings.sol';
 import './interfaces/IEraManager.sol';
 import './interfaces/ISQToken.sol';
 import './interfaces/IDisputeManager.sol';
+import './interfaces/IParameter.sol';
 
-contract DisputeManager is IDisputeManager, Initializable, OwnableUpgradeable {
+contract DisputeManager is IDisputeManager, Initializable, OwnableUpgradeable, IParameter {
     using SafeERC20 for IERC20;
 
     enum DisputeType {
@@ -65,6 +66,7 @@ contract DisputeManager is IDisputeManager, Initializable, OwnableUpgradeable {
         settings = _settings;
         nextDisputeId = 1;
         minimumDeposit = _minimumDeposit;
+        emit Parameter('minimumDeposit', abi.encodePacked(minimumDeposit));
     }
 
     /**
@@ -77,6 +79,7 @@ contract DisputeManager is IDisputeManager, Initializable, OwnableUpgradeable {
 
     function setMinimumDeposit(uint256 _minimumDeposit) external onlyOwner {
         minimumDeposit = _minimumDeposit;
+        emit Parameter('minimumDeposit', abi.encodePacked(minimumDeposit));
     }
 
     function createDispute(

contracts/IndexerRegistry.sol

@@ -15,6 +15,7 @@ import './Constants.sol';
 import './interfaces/IRewardsStaking.sol';
 import './interfaces/IStakingManager.sol';
 import './utils/MathUtil.sol';
+import './interfaces/IParameter.sol';
 
 /**
  * @title Indexer Registry Contract
@@ -44,7 +45,7 @@ import './utils/MathUtil.sol';
  * Indexer must set a appropriate commission rate and stake enough SQT Token when registering.
  * Indexer need to make sure all the query projects with NOT INDEXING status before unregister.
  */
-contract IndexerRegistry is Initializable, OwnableUpgradeable {
+contract IndexerRegistry is Initializable, OwnableUpgradeable, IParameter {
     using SafeERC20 for IERC20;
     using MathUtil for uint256;
 
@@ -113,6 +114,8 @@ contract IndexerRegistry is Initializable, OwnableUpgradeable {
 
         settings = _settings;
         minimumStakingAmount = _minimumStakingAmount;
+        emit Parameter('minimumStakingAmount', abi.encodePacked(minimumStakingAmount));
+        emit Parameter('minimumCommissionRate', abi.encodePacked(uint256(0)));
     }
 
     /**
@@ -129,6 +132,7 @@ contract IndexerRegistry is Initializable, OwnableUpgradeable {
      */
     function setminimumStakingAmount(uint256 amount) external onlyOwner {
         minimumStakingAmount = amount;
+        emit Parameter('minimumStakingAmount', abi.encodePacked(minimumStakingAmount));
     }
 
     /**
@@ -139,6 +143,7 @@ contract IndexerRegistry is Initializable, OwnableUpgradeable {
         require(rate <= PER_MILL, 'IR006');
         minimumCommissionRate = rate;
         emit MinimumCommissionRateUpdated(rate);
+        emit Parameter('minimumCommissionRate', abi.encodePacked(minimumCommissionRate));
     }
 
     /**

contracts/PermissionedExchange.sol

@@ -10,13 +10,14 @@ import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
 
 import './interfaces/ISettings.sol';
 import './interfaces/IEraManager.sol';
+import './interfaces/IParameter.sol';
 
 /**
  * @title PermissionedExchange Contract
  * @notice For now PermissionedExchange contract allows traders trade their SQTs on admin sent orders, later on we may allow others to send their orders. Controllers may set the trade quota for trader, and trader cannot trade over the their quota.
  * It provides a way for indexers to swap their rewards(SQT) to stable token with a fixed exchange rate.
  */
-contract PermissionedExchange is Initializable, OwnableUpgradeable {
+contract PermissionedExchange is Initializable, OwnableUpgradeable, IParameter {
     using SafeERC20 for IERC20;
 
     struct ExchangeOrder {
@@ -93,6 +94,9 @@ contract PermissionedExchange is Initializable, OwnableUpgradeable {
         for (uint256 i; i < _controllers.length; i++) {
             exchangeController[_controllers[i]] = true;
         }
+
+        emit Parameter('tradeLimitation', abi.encodePacked(uint256(0)));
+        emit Parameter('tradeLimitationPerAccount', abi.encodePacked(uint256(0)));
     }
 
     /**
@@ -118,6 +122,7 @@ contract PermissionedExchange is Initializable, OwnableUpgradeable {
      */
     function setTradeLimitation(uint256 _limit) external onlyOwner {
         tradeLimitation = _limit;
+        emit Parameter('tradeLimitation', abi.encodePacked(tradeLimitation));
     }
 
     /**
@@ -126,6 +131,7 @@ contract PermissionedExchange is Initializable, OwnableUpgradeable {
      */
     function setTradeLimitationPerAccount(uint256 _limit) external onlyOwner {
         tradeLimitationPerAccount = _limit;
+        emit Parameter('tradeLimitationPerAccount', abi.encodePacked(tradeLimitationPerAccount));
     }
 
     /**

contracts/PlanManager.sol

@@ -13,6 +13,7 @@ import './interfaces/ISettings.sol';
 import './interfaces/IPlanManager.sol';
 import './interfaces/IEraManager.sol';
 import './interfaces/IPriceOracle.sol';
+import './interfaces/IParameter.sol';
 
 /**
  * @title Plan Manager Contract
@@ -26,7 +27,7 @@ import './interfaces/IPriceOracle.sol';
  * PlanTemplate: PlanTemplate is create and maintenance by owner, we provide a set of PlanTemplates
  * for Indexer to create the Plan.
  */
-contract PlanManager is Initializable, OwnableUpgradeable, IPlanManager {
+contract PlanManager is Initializable, OwnableUpgradeable, IPlanManager, IParameter {
     /// @dev ### STATES
     /// @notice ISettings contract which stores SubQuery network contracts address
     ISettings public settings;
@@ -81,6 +82,7 @@ contract PlanManager is Initializable, OwnableUpgradeable, IPlanManager {
         settings = _settings;
         limit = 5;
         nextPlanId = 1;
+        emit Parameter('limit', abi.encodePacked(limit));
     }
 
     /**
@@ -97,6 +99,7 @@ contract PlanManager is Initializable, OwnableUpgradeable, IPlanManager {
      */
     function setPlanLimit(uint256 _limit) external onlyOwner {
         limit = _limit;
+        emit Parameter('limit', abi.encodePacked(limit));
     }
 
     /**

contracts/PriceOracle.sol

@@ -7,8 +7,9 @@ import '@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol';
 import '@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol';
 
 import './interfaces/IPriceOracle.sol';
+import './interfaces/IParameter.sol';
 
-contract PriceOracle is IPriceOracle, Initializable, OwnableUpgradeable {
+contract PriceOracle is IPriceOracle, Initializable, OwnableUpgradeable, IParameter {
     ///@notice the price of assetTo in assetFrom
     mapping(address => mapping(address => uint256)) public prices;
 
@@ -32,6 +33,8 @@ contract PriceOracle is IPriceOracle, Initializable, OwnableUpgradeable {
         sizeLimit = _sizeLimit;
         blockLimit = _blockLimit;
         enlargementFactor = 1e6;
+        emit Parameter('sizeLimit', abi.encodePacked(sizeLimit));
+        emit Parameter('blockLimit', abi.encodePacked(blockLimit));
     }
 
     event PricePosted(address assetFrom, address assetTo, uint256 previousPrice, uint256 newPrice);
@@ -40,6 +43,8 @@ contract PriceOracle is IPriceOracle, Initializable, OwnableUpgradeable {
     function setLimit(uint256 _sizeLimit, uint256 _blockLimit) public onlyOwner {
         sizeLimit = _sizeLimit;
         blockLimit = _blockLimit;
+        emit Parameter('sizeLimit', abi.encodePacked(sizeLimit));
+        emit Parameter('blockLimit', abi.encodePacked(blockLimit));
     }
 
     ///@notice update the controller account

contracts/PurchaseOfferMarket.sol

@@ -18,6 +18,7 @@ import './interfaces/IEraManager.sol';
 import './interfaces/IStakingManager.sol';
 import './Constants.sol';
 import './utils/MathUtil.sol';
+import './interfaces/IParameter.sol';
 
 /**
  * @title Purchase Offer Market Contract
@@ -42,7 +43,12 @@ import './utils/MathUtil.sol';
  * Consumers can cancel their purchase offer after expire date for free, but if cancel the unexpired Purchase Offer
  * we will charge the penalty fee.
  */
-contract PurchaseOfferMarket is Initializable, OwnableUpgradeable, IPurchaseOfferMarket {
+contract PurchaseOfferMarket is
+    Initializable,
+    OwnableUpgradeable,
+    IPurchaseOfferMarket,
+    IParameter
+{
     using SafeERC20 for IERC20;
 
     /**
@@ -139,6 +145,9 @@ contract PurchaseOfferMarket is Initializable, OwnableUpgradeable, IPurchaseOffe
         settings = _settings;
         penaltyRate = _penaltyRate;
         penaltyDestination = _penaltyDestination;
+
+        emit Parameter('penaltyRate', abi.encodePacked(penaltyRate));
+        emit Parameter('penaltyDestination', abi.encodePacked(penaltyDestination));
     }
 
     /**
@@ -156,6 +165,7 @@ contract PurchaseOfferMarket is Initializable, OwnableUpgradeable, IPurchaseOffe
     function setPenaltyRate(uint256 _penaltyRate) external onlyOwner {
         require(_penaltyRate < PER_MILL, 'PO001');
         penaltyRate = _penaltyRate;
+        emit Parameter('penaltyRate', abi.encodePacked(penaltyRate));
     }
 
     /**
@@ -164,6 +174,7 @@ contract PurchaseOfferMarket is Initializable, OwnableUpgradeable, IPurchaseOffe
      */
     function setPenaltyDestination(address _penaltyDestination) external onlyOwner {
         penaltyDestination = _penaltyDestination;
+        emit Parameter('penaltyDestination', abi.encodePacked(penaltyDestination));
     }
 
     /**

contracts/RewardsBooster.sol

@@ -24,13 +24,14 @@ import './interfaces/IProjectRegistry.sol';
 import './utils/FixedMath.sol';
 import './utils/MathUtil.sol';
 import './utils/StakingUtil.sol';
+import './interfaces/IParameter.sol';
 
 /**
  * @title Rewards for running
  * @notice ### Overview
  * The RewardsRunning using the Cobb-Douglas production function for staking & running
  */
-contract RewardsBooster is Initializable, OwnableUpgradeable, IRewardsBooster {
+contract RewardsBooster is Initializable, OwnableUpgradeable, IRewardsBooster, IParameter {
     using ERC165CheckerUpgradeable for address;
     using SafeERC20 for IERC20;
     using MathUtil for uint256;
@@ -120,6 +121,8 @@ contract RewardsBooster is Initializable, OwnableUpgradeable, IRewardsBooster {
         settings = _settings;
         issuancePerBlock = _issuancePerBlock;
         minimumDeploymentBooster = _minimumDeploymentBooster;
+        emit Parameter('issuancePerBlock', abi.encodePacked(issuancePerBlock));
+        emit Parameter('minimumDeploymentBooster', abi.encodePacked(minimumDeploymentBooster));
     }
 
     /**
@@ -137,6 +140,7 @@ contract RewardsBooster is Initializable, OwnableUpgradeable, IRewardsBooster {
 
     function setMinimumDeploymentBooster(uint256 _minimumDeploymentBooster) external onlyOwner {
         minimumDeploymentBooster = _minimumDeploymentBooster;
+        emit Parameter('minimumDeploymentBooster', abi.encodePacked(minimumDeploymentBooster));
     }
 
     /**
@@ -151,6 +155,7 @@ contract RewardsBooster is Initializable, OwnableUpgradeable, IRewardsBooster {
 
         issuancePerBlock = _issuancePerBlock;
         emit ParameterUpdated('issuancePerBlock', issuancePerBlock);
+        emit Parameter('issuancePerBlock', abi.encodePacked(issuancePerBlock));
     }
 
     /**
@@ -197,10 +202,7 @@ contract RewardsBooster is Initializable, OwnableUpgradeable, IRewardsBooster {
      * @param deploymentId deploymentId
      * @param amount the added amount
      */
-    function removeBoosterDeployment(
-        bytes32 deploymentId,
-        uint256 amount
-    ) external {
+    function removeBoosterDeployment(bytes32 deploymentId, uint256 amount) external {
         require(deploymentPools[deploymentId].accountBooster[msg.sender] >= amount, 'RB003');
         _removeBoosterDeployment(deploymentId, msg.sender, amount);
         IERC20(settings.getContractAddress(SQContracts.SQToken)).safeTransfer(msg.sender, amount);
@@ -278,21 +280,24 @@ contract RewardsBooster is Initializable, OwnableUpgradeable, IRewardsBooster {
             );
     }
 
-
     /**
      * @notice Add booster deployment staking
      * @param _deploymentId the deployment id
      * @param _account the booster account
      * @param _amount the added amount
      */
-    function _addBoosterDeployment(bytes32 _deploymentId, address _account, uint256 _amount) internal {
+    function _addBoosterDeployment(
+        bytes32 _deploymentId,
+        address _account,
+        uint256 _amount
+    ) internal {
         DeploymentPool storage deploymentPool = deploymentPools[_deploymentId];
         onDeploymentBoosterUpdate(_deploymentId, _account);
         deploymentPool.boosterPoint += _amount;
         deploymentPool.accountBooster[_account] += _amount;
         deploymentPool.accRewardsPerBooster = accRewardsPerBooster;
         totalBoosterPoint += _amount;
-        
+
         emit DeploymentBoosterAdded(_deploymentId, _account, _amount);
     }
 

contracts/RewardsDistributor.sol

@@ -20,6 +20,7 @@ import './interfaces/IStaking.sol';
 import './interfaces/IStakingManager.sol';
 import './Constants.sol';
 import './utils/MathUtil.sol';
+import './interfaces/IParameter.sol';
 
 /**
  * @title Rewards Distributer Contract
@@ -55,7 +56,7 @@ import './utils/MathUtil.sol';
  *
  * Runner's commission is treated as unbond request to Staking Contract, which applies a lock period on it.
  */
-contract RewardsDistributor is IRewardsDistributor, Initializable, OwnableUpgradeable {
+contract RewardsDistributor is IRewardsDistributor, Initializable, OwnableUpgradeable, IParameter {
     using SafeERC20 for IERC20;
     using MathUtil for uint256;
 
@@ -123,6 +124,8 @@ contract RewardsDistributor is IRewardsDistributor, Initializable, OwnableUpgrad
 
         //Settings
         settings = _settings;
+        emit Parameter('maxCommissionFactor', abi.encodePacked(uint256(0)));
+        emit Parameter('maxRewardFactor', abi.encodePacked(uint256(0)));
     }
 
     function setSettings(ISettings _settings) external onlyOwner {
@@ -131,10 +134,12 @@ contract RewardsDistributor is IRewardsDistributor, Initializable, OwnableUpgrad
 
     function setMaxCommissionFactor(uint256 _maxCommissionFactor) external onlyOwner {
         maxCommissionFactor = _maxCommissionFactor;
+        emit Parameter('maxCommissionFactor', abi.encodePacked(maxCommissionFactor));
     }
 
     function setMaxRewardFactor(uint256 _maxRewardFactor) external onlyOwner {
         maxRewardFactor = _maxRewardFactor;
+        emit Parameter('maxRewardFactor', abi.encodePacked(maxRewardFactor));
     }
 
     /**