xINV Manager contract and deploy script

contracts/XinvManager.sol

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+pragma solidity ^0.5.16;
+
+interface Ixinv {
+    function _acceptAdmin() external;
+    function _setPendingAdmin(address payable newPendingAdmin) external;
+    function _setComptroller(address newComptroller) external;
+    function _setRewardTreasury(address newRewardTreasury) external;
+    function _setRewardPerBlock(uint newRewardPerBlock) external;
+}
+
+contract XinvManager {
+
+    Ixinv public xinv;
+    address public governance;
+    address public policyCommittee;
+    uint public maxRewardPerBlock = uint(-1);
+
+    constructor(Ixinv _xinv, address _governance, address _policyCommittee) public {
+        xinv = _xinv;
+        governance = _governance;
+        policyCommittee = _policyCommittee;
+    }
+
+    modifier onlyGov {
+        require(msg.sender == governance, "ONLY GOVERNANCE");
+        _;
+    }
+
+    function changeGovernance(address _governance) external onlyGov {
+        require(_governance != address(0), "GOVERNANCE CANNOT BE ADDRESS 0");
+        governance = _governance;
+    }
+
+    function changePolicyCommittee(address _policyCommittee) external onlyGov {
+        require(_policyCommittee != address(0), "POLICY COMMITTEE CANNOT BE ADDRESS 0");
+        policyCommittee = _policyCommittee;
+    }
+
+    function _acceptAdmin() external onlyGov {
+        xinv._acceptAdmin();
+    }
+
+    function _setPendingAdmin(address payable newPendingAdmin) external onlyGov {
+        xinv._setPendingAdmin(newPendingAdmin);
+    }
+
+    function _setComptroller(address newComptroller) external onlyGov {
+        xinv._setComptroller(newComptroller);
+    }
+
+    function _setRewardTreasury(address newRewardTreasury) external onlyGov {
+        xinv._setRewardTreasury(newRewardTreasury);
+    }
+
+    function _setRewardPerBlock(uint newRewardPerBlock) external {
+        require(msg.sender == policyCommittee || msg.sender == governance, "ONLY POLICY COMMITTEE OR GOVERNANCE");
+        require(newRewardPerBlock <= maxRewardPerBlock, "NEW REWARD RATE EXCEEDS MAX");
+        xinv._setRewardPerBlock(newRewardPerBlock);
+    }
+
+    function setMaxRewardPerBlock(uint _maxRewardPerBlock) external onlyGov {
+        maxRewardPerBlock = _maxRewardPerBlock;
+    }
+}

deploy/36_xinvManager.js

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+module.exports = async ({
+    deployments,
+    getNamedAccounts
+  }) => {
+    console.log("36. Deploy xINV Manager")
+    const {deploy, get} = deployments;
+    const {deployer, gov} = await getNamedAccounts();
+    const XINV = await get('XINV');
+
+    await deploy('XinvManager', {
+      from: deployer,
+      args:[
+        XINV.address,
+        gov,
+        policyCommittee
+      ]
+    });
+  };
+
+module.exports.tags = ['XinvManager'];