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// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;

import "./Interfaces.sol";
import "@openzeppelin/contracts-0.6/math/SafeMath.sol";
import "@openzeppelin/contracts-0.6/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts-0.6/utils/Address.sol";
import "@openzeppelin/contracts-0.6/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts-0.6/utils/ReentrancyGuard.sol";

/**
 * @title   Booster
 * @author  ConvexFinance
 * @notice  Main deposit contract; keeps track of pool info & user deposits; distributes rewards.
 * @dev     They say all paths lead to Rome, and the cvxBooster is no different. This is where it all goes down.
 *          It is responsible for tracking all the pools, it collects rewards from all pools and redirects it.
 */
contract Booster is ReentrancyGuard {
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;

    address public immutable crv;

    mapping(address => bool) public validVotingContracts;

    uint256 public lockIncentive = 825; //incentive to crv stakers
    uint256 public stakerIncentive = 825; //incentive to native token stakers
    uint256 public earmarkIncentive = 50; //incentive to users who spend gas to make calls
    uint256 public platformFee = 0; //possible fee to build treasury
    uint256 public constant MaxFees = 4000;
    uint256 public constant FEE_DENOMINATOR = 10000;

    address public owner;
    address public feeManager;
    address public poolManager;
    address public immutable staker;
    address public immutable minter;
    address public rewardFactory;
    address public stashFactory;
    address public tokenFactory;
    address public rewardArbitrator;
    address public voteDelegate;
    address public voteManager;
    address public treasury;
    address public stakerRewards; //cvx rewards
    address public lockRewards; //cvxCrv rewards(crv)
    address public bridgeDelegate;
    mapping(uint256 => uint256) public l2FeesHistory;
    uint256 immutable epochLength = 1 weeks;

    mapping(address => FeeDistro) public feeTokens;
    struct FeeDistro {
        address distro;
        address rewards;
        bool active;
    }

    bool public isShutdown;

    struct PoolInfo {
        address lptoken;
        address token;
        address gauge;
        address crvRewards;
        address stash;
        bool shutdown;
    }

    //index(pid) -> pool
    PoolInfo[] public poolInfo;
    mapping(address => bool) public gaugeMap;

    // Reward multiplier for increasing or decreasing AURA rewards per PID
    uint256 public constant REWARD_MULTIPLIER_DENOMINATOR = 10000;
    // rewardContract => rewardMultiplier (10000 = 100%)
    mapping(address => uint256) public getRewardMultipliers;

    event Deposited(address indexed user, uint256 indexed poolid, uint256 amount);
    event Withdrawn(address indexed user, uint256 indexed poolid, uint256 amount);

    event PoolAdded(address lpToken, address gauge, address token, address rewardPool, address stash, uint256 pid);
    event PoolShutdown(uint256 poolId);

    event OwnerUpdated(address newOwner);
    event FeeManagerUpdated(address newFeeManager);
    event PoolManagerUpdated(address newPoolManager);
    event FactoriesUpdated(address rewardFactory, address stashFactory, address tokenFactory);
    event ArbitratorUpdated(address newArbitrator);
    event VoteDelegateUpdated(address newVoteDelegate);
    event VoteManagerUpdated(address newVoteManager);
    event RewardContractsUpdated(address lockRewards, address stakerRewards);
    event FeesUpdated(uint256 lockIncentive, uint256 stakerIncentive, uint256 earmarkIncentive, uint256 platformFee);
    event TreasuryUpdated(address newTreasury);
    event FeeInfoUpdated(address feeDistro, address lockFees, address feeToken);
    event FeeInfoChanged(address feeDistro, bool active);

    event UpdateVotingContract(address votingContract, bool active);

    /**
     * @dev Constructor doing what constructors do. It is noteworthy that
     *      a lot of basic config is set to 0 - expecting subsequent calls to setFeeInfo etc.
     * @param _staker                 VoterProxy (locks the crv and adds to all gauges)
     * @param _minter                 CVX token, or the thing that mints it
     * @param _crv                    CRV
     */
    constructor(
        address _staker,
        address _minter,
        address _crv
    ) public {
        staker = _staker;
        minter = _minter;
        crv = _crv;
        isShutdown = false;

        owner = msg.sender;
        voteDelegate = msg.sender;
        feeManager = msg.sender;
        poolManager = msg.sender;
        voteManager = msg.sender;
        treasury = address(0);

        emit OwnerUpdated(msg.sender);
        emit VoteDelegateUpdated(msg.sender);
        emit FeeManagerUpdated(msg.sender);
        emit PoolManagerUpdated(msg.sender);
    }


    /// SETTER SECTION ///

    /**
     * @notice Owner is responsible for setting initial config, updating vote delegate and shutting system
     */
    function setOwner(address _owner) external {
        require(msg.sender == owner, "!auth");
        owner = _owner;

        emit OwnerUpdated(_owner);
    }

    /**
     * @notice Fee Manager can update the fees (lockIncentive, stakeIncentive, earmarkIncentive, platformFee)
     */
    function setFeeManager(address _feeM) external {
        require(msg.sender == owner, "!auth");
        feeManager = _feeM;

        emit FeeManagerUpdated(_feeM);
    }

    /**
     * @notice Pool manager is responsible for adding new pools
     */
    function setPoolManager(address _poolM) external {
        require(msg.sender == poolManager, "!auth");
        poolManager = _poolM;

        emit PoolManagerUpdated(_poolM);
    }

    /**
     * @notice Factories are used when deploying new pools. Only the stash factory is mutable after init
     */
    function setFactories(address _rfactory, address _sfactory, address _tfactory) external {
        require(msg.sender == owner, "!auth");

        //stash factory should be considered more safe to change
        //updating may be required to handle new types of gauges
        stashFactory = _sfactory;

        //reward factory only allow this to be called once even if owner
        //removes ability to inject malicious staking contracts
        //token factory can also be immutable
        if(rewardFactory == address(0)){
            rewardFactory = _rfactory;
            tokenFactory = _tfactory;

            emit FactoriesUpdated(_rfactory, _sfactory, _tfactory);
        } else {
            emit FactoriesUpdated(address(0), _sfactory, address(0));
        }
    }

    /**
     * @notice Arbitrator handles tokens that are used as secondary rewards across multiple pools
     */
    function setArbitrator(address _arb) external {
        require(msg.sender==owner, "!auth");
        rewardArbitrator = _arb;

        emit ArbitratorUpdated(_arb);
    }

    /**
     * @notice Vote Delegate has the rights to cast votes on the VoterProxy via the Booster
     */
    function setVoteDelegate(address _voteDelegate) external {
        require(msg.sender==owner, "!auth");
        voteDelegate = _voteDelegate;

        emit VoteDelegateUpdated(_voteDelegate);
    }

    /**
     * @notice Vote Manager has the rights to add new voting contracts
     */
    function setVoteManager(address _voteManager) external {
        require(msg.sender==owner, "!auth");
        voteManager = _voteManager;

        emit VoteManagerUpdated(_voteManager);
    }

    /**
     * @notice Only called once, to set the addresses of cvxCrv (lockRewards) and cvx staking (stakerRewards)
     */
    function setRewardContracts(address _rewards, address _stakerRewards) external {
        require(msg.sender == owner, "!auth");
        
        //reward contracts are immutable or else the owner
        //has a means to redeploy and mint cvx via rewardClaimed()
        if(lockRewards == address(0)){
            lockRewards = _rewards;
            stakerRewards = _stakerRewards;
            getRewardMultipliers[lockRewards] = REWARD_MULTIPLIER_DENOMINATOR;
            emit RewardContractsUpdated(_rewards, _stakerRewards);
        }
    }

    /**
     * @notice Set reward token and claim contract
     * @dev    This creates a secondary (VirtualRewardsPool) rewards contract for the vcxCrv staking contract
     */
    function setFeeInfo(address _feeToken, address _feeDistro) external nonReentrant {
        require(msg.sender == owner, "!auth");
        require(!isShutdown, "shutdown");
        require(lockRewards != address(0) && rewardFactory != address(0), "!initialised");

        require(_feeToken != address(0) && _feeDistro != address(0), "!addresses");
        require(IFeeDistributor(_feeDistro).getTokenTimeCursor(_feeToken) > 0, "!distro");

        if(feeTokens[_feeToken].distro == address(0)){
            require(!gaugeMap[_feeToken], "!token");

            // Distributed directly
            if(_feeToken == crv){
                feeTokens[crv] = FeeDistro({
                    distro: _feeDistro,
                    rewards: lockRewards,
                    active: true
                });
                emit FeeInfoUpdated(_feeDistro, lockRewards, crv);
            } else {
                //create a new reward contract for the new token
                require(IRewards(lockRewards).extraRewardsLength() < 10, "too many rewards");
                address rewards = IRewardFactory(rewardFactory).CreateTokenRewards(_feeToken, lockRewards, address(this));
                feeTokens[_feeToken] = FeeDistro({
                    distro: _feeDistro,
                    rewards: rewards,
                    active: true
                });
                emit FeeInfoUpdated(_feeDistro, rewards, _feeToken);
            }
        } else {
            feeTokens[_feeToken].distro = _feeDistro;
            emit FeeInfoUpdated(_feeDistro, address(0), _feeToken);
        }
    }

    /**
     * @notice Allows turning off or on for fee distro
     */
    function updateFeeInfo(address _feeToken, bool _active) external {
        require(msg.sender==owner, "!auth");

        require(feeTokens[_feeToken].distro != address(0), "Fee doesn't exist");

        feeTokens[_feeToken].active = _active;

        emit FeeInfoChanged(_feeToken, _active);
    }

    /**
     * @notice Fee manager can set all the relevant fees
     * @param _lockFees     % for cvxCrv stakers where 1% == 100
     * @param _stakerFees   % for CVX stakers where 1% == 100
     * @param _callerFees   % for whoever calls the claim where 1% == 100
     * @param _platform     % for "treasury" or WETH-LIQ or liqLIT-LIT staking where 1% == 100
     */
    function setFees(uint256 _lockFees, uint256 _stakerFees, uint256 _callerFees, uint256 _platform) external nonReentrant{
        require(msg.sender==feeManager, "!auth");

        uint256 total = _lockFees.add(_stakerFees).add(_callerFees).add(_platform);
        require(total <= MaxFees, ">MaxFees");

        require(_lockFees >= 300 && _lockFees <= 3500, "!lockFees");
        require(_stakerFees >= 300 && _stakerFees <= 1500, "!stakerFees");
        require(_callerFees >= 10 && _callerFees <= 100, "!callerFees");
        require(_platform <= 1000, "!platform");

        lockIncentive = _lockFees;
        stakerIncentive = _stakerFees;
        earmarkIncentive = _callerFees;
        platformFee = _platform;

        emit FeesUpdated(_lockFees, _stakerFees, _callerFees, _platform);
    }

    /**
     * @notice Set the address of the treasury (i.e. vlCVX)
     */
    function setTreasury(address _treasury) external {
        require(msg.sender==feeManager, "!auth");
        treasury = _treasury;

        emit TreasuryUpdated(_treasury);
    }

    
    /**
     * @dev Set bridge delegate
     * @param _bridgeDelegate The bridge delegate address
     */
    function setBridgeDelegate(address _bridgeDelegate) external {
        require(msg.sender == feeManager, "!auth");
        bridgeDelegate = _bridgeDelegate;
    }

    function setRewardMultiplier(address rewardContract, uint256 multiplier) external {
        require(msg.sender == feeManager, "!auth");
        require(multiplier <= REWARD_MULTIPLIER_DENOMINATOR * 2, "too high");
        getRewardMultipliers[rewardContract] = multiplier;
    }

    /// END SETTER SECTION ///


    function poolLength() external view returns (uint256) {
        return poolInfo.length;
    }

    /**
     * @notice Called by the PoolManager (i.e. PoolManagerProxy) to add a new pool - creates all the required
     *         contracts (DepositToken, RewardPool, Stash) and then adds to the list!
     */
    function addPool(address _lptoken, address _gauge, uint256 _stashVersion) external returns(bool){
        require(msg.sender==poolManager && !isShutdown, "!add");
        require(_gauge != address(0) && _lptoken != address(0),"!param");
        require(feeTokens[_gauge].distro == address(0), "!gauge");

        //the next pool's pid
        uint256 pid = poolInfo.length;

        //create a tokenized deposit
        address token = ITokenFactory(tokenFactory).CreateDepositToken(_lptoken);
        //create a reward contract for crv rewards
        address newRewardPool = IRewardFactory(rewardFactory).CreateCrvRewards(pid,token,_lptoken);
        //create a stash to handle extra incentives
        address stash = IStashFactory(stashFactory).CreateStash(pid,_gauge,staker,_stashVersion);

        //add the new pool
        poolInfo.push(
            PoolInfo({
                lptoken: _lptoken,
                token: token,
                gauge: _gauge,
                crvRewards: newRewardPool,
                stash: stash,
                shutdown: false
            })
        );
        gaugeMap[_gauge] = true;
        //give stashes access to rewardfactory and voteproxy
        //   voteproxy so it can grab the incentive tokens off the contract after claiming rewards
        //   reward factory so that stashes can make new extra reward contracts if a new incentive is added to the gauge
        if(stash != address(0)){
            poolInfo[pid].stash = stash;
            IStaker(staker).setStashAccess(stash,true);
            IRewardFactory(rewardFactory).setAccess(stash,true);
        }

        // Init the pool with the default reward multiplier
        getRewardMultipliers[newRewardPool] = REWARD_MULTIPLIER_DENOMINATOR;

        emit PoolAdded(_lptoken, _gauge, token, newRewardPool, stash, pid);
        return true;
    }

    /**
     * @notice Shuts down the pool by withdrawing everything from the gauge to here (can later be
     *         claimed from depositors by using the withdraw fn) and marking it as shut down
     */
    function shutdownPool(uint256 _pid) external nonReentrant returns(bool){
        require(msg.sender==poolManager, "!auth");
        PoolInfo storage pool = poolInfo[_pid];

        //withdraw from gauge
        try IStaker(staker).withdrawAll(pool.lptoken,pool.gauge){
        }catch{}

        pool.shutdown = true;
        gaugeMap[pool.gauge] = false;

        emit PoolShutdown(_pid);
        return true;
    }

    /**
     * @notice Shuts down the WHOLE SYSTEM by withdrawing all the LP tokens to here and then allowing
     *         for subsequent withdrawal by any depositors.
     */
    function shutdownSystem() external{
        require(msg.sender == owner, "!auth");
        isShutdown = true;

        for(uint i=0; i < poolInfo.length; i++){
            PoolInfo storage pool = poolInfo[i];
            if (pool.shutdown) continue;

            address token = pool.lptoken;
            address gauge = pool.gauge;

            //withdraw from gauge
            try IStaker(staker).withdrawAll(token,gauge){
                pool.shutdown = true;
            }catch{}
        }
    }

    /**
     * @notice  Deposits an "_amount" to a given gauge (specified by _pid), mints a `DepositToken`
     *          and subsequently stakes that on Convex BaseRewardPool
     */
    function deposit(uint256 _pid, uint256 _amount, bool _stake) public nonReentrant returns(bool){
        require(!isShutdown,"shutdown");
        PoolInfo storage pool = poolInfo[_pid];
        require(pool.shutdown == false, "pool is closed");

        //send to proxy to stake
        address lptoken = pool.lptoken;
        IERC20(lptoken).safeTransferFrom(msg.sender, staker, _amount);

        //stake
        address gauge = pool.gauge;
        require(gauge != address(0),"!gauge setting");
        IStaker(staker).deposit(lptoken,gauge);

        //some gauges claim rewards when depositing, stash them in a seperate contract until next claim
        address stash = pool.stash;
        if(stash != address(0)){
            IStash(stash).stashRewards();
        }

        address token = pool.token;
        if(_stake){
            //mint here and send to rewards on user behalf
            ITokenMinter(token).mint(address(this),_amount);
            address rewardContract = pool.crvRewards;
            IERC20(token).safeApprove(rewardContract,0);
            IERC20(token).safeApprove(rewardContract,_amount);
            IRewards(rewardContract).stakeFor(msg.sender,_amount);
        }else{
            //add user balance directly
            ITokenMinter(token).mint(msg.sender,_amount);
        }

        
        emit Deposited(msg.sender, _pid, _amount);
        return true;
    }

    /**
     * @notice  Deposits all a senders balance to a given gauge (specified by _pid), mints a `DepositToken`
     *          and subsequently stakes that on Convex BaseRewardPool
     */
    function depositAll(uint256 _pid, bool _stake) external returns(bool){
        address lptoken = poolInfo[_pid].lptoken;
        uint256 balance = IERC20(lptoken).balanceOf(msg.sender);
        deposit(_pid,balance,_stake);
        return true;
    }

    /**
     * @notice  Withdraws LP tokens from a given PID (& user).
     *          1. Burn the cvxLP balance from "_from" (implicit balance check)
     *          2. If pool !shutdown.. withdraw from gauge
     *          3. If stash, stash rewards
     *          4. Transfer out the LP tokens
     */
    function _withdraw(uint256 _pid, uint256 _amount, address _from, address _to) internal nonReentrant {
        PoolInfo storage pool = poolInfo[_pid];
        address lptoken = pool.lptoken;
        address gauge = pool.gauge;

        //remove lp balance
        address token = pool.token;
        ITokenMinter(token).burn(_from,_amount);

        //pull from gauge if not shutdown
        // if shutdown tokens will be in this contract
        if (!pool.shutdown) {
            IStaker(staker).withdraw(lptoken,gauge, _amount);
        }

        //some gauges claim rewards when withdrawing, stash them in a separate contract until next claim
        //do not call if shutdown since stashes wont have access
        address stash = pool.stash;
        if(stash != address(0) && !isShutdown && !pool.shutdown){
            IStash(stash).stashRewards();
        }
        
        //return lp tokens
        IERC20(lptoken).safeTransfer(_to, _amount);

        emit Withdrawn(_to, _pid, _amount);
    }

    /**
     * @notice  Withdraw a given amount from a pool (must already been unstaked from the Convex Reward Pool -
     *          BaseRewardPool uses withdrawAndUnwrap to get around this)
     */
    function withdraw(uint256 _pid, uint256 _amount) public returns(bool){
        _withdraw(_pid,_amount,msg.sender,msg.sender);
        return true;
    }

    /**
     * @notice  Withdraw all the senders LP tokens from a given gauge
     */
    function withdrawAll(uint256 _pid) public returns(bool){
        address token = poolInfo[_pid].token;
        uint256 userBal = IERC20(token).balanceOf(msg.sender);
        withdraw(_pid, userBal);
        return true;
    }

    /**
     * @notice Allows the actual BaseRewardPool to withdraw and send directly to the user
     */
    function withdrawTo(uint256 _pid, uint256 _amount, address _to) external returns(bool){
        address rewardContract = poolInfo[_pid].crvRewards;
        require(msg.sender == rewardContract,"!auth");

        _withdraw(_pid,_amount,msg.sender,_to);
        return true;
    }

    /**
     * @notice set valid vote hash on VoterProxy 
     */
    function setVote(bytes32 _hash) external returns(bool){
        require(msg.sender == voteDelegate, "!auth");
        
        IStaker(staker).setVote(_hash, false);
        return true;
    }

    /**
     * @notice Set delegate on snapshot
     */
    function setDelegate(address _delegateContract, address _delegate, bytes32 _space) external{
        require(msg.sender == voteDelegate, "!auth");
        bytes memory data = abi.encodeWithSelector(bytes4(keccak256("setDelegate(bytes32,address)")), _space, _delegate);
        IStaker(staker).execute(_delegateContract,uint256(0),data);
    }

    /**
     * @notice Delegate address votes on dao via VoterProxy
     */
    function vote(uint256 _voteId, address _votingAddress, bool _support) external returns(bool){
        require(msg.sender == voteDelegate, "!auth");
        require(validVotingContracts[_votingAddress], "!voteAddr");
        
        IStaker(staker).vote(_voteId,_votingAddress,_support);
        return true;
    }

    /**
     * @notice Delegate address votes on gauge weight via VoterProxy
     */
    function voteGaugeWeight(address[] calldata _gauge, uint256[] calldata _weight ) external returns(bool){
        require(msg.sender == voteDelegate, "!auth");

        for(uint256 i = 0; i < _gauge.length; i++){
            IStaker(staker).voteGaugeWeight(_gauge[i],_weight[i]);
        }
        return true;
    }

    /**
     * @notice Enables or disables a Timeless on-chain DAO voting contract
     */
    function updateVotingContract(address _votingContract, bool _active) external {
        require(msg.sender == voteManager, "!auth");
		validVotingContracts[_votingContract] = _active;
		emit UpdateVotingContract(_votingContract, _active);
	}

    /**
     * @notice Allows a stash to claim secondary rewards from a gauge
     */
    function claimRewards(uint256 _pid, address _gauge) external returns(bool){
        address stash = poolInfo[_pid].stash;
        require(msg.sender == stash,"!auth");

        IStaker(staker).claimRewards(_gauge);
        return true;
    }

    /**
     * @notice Tells the Curve gauge to redirect any accrued rewards to the given stash via the VoterProxy
     */
    function setGaugeRedirect(uint256 _pid) external returns(bool){
        address stash = poolInfo[_pid].stash;
        require(msg.sender == stash,"!auth");
        address gauge = poolInfo[_pid].gauge;
        bytes memory data = abi.encodeWithSelector(bytes4(keccak256("set_rewards_receiver(address)")), stash);
        IStaker(staker).execute(gauge,uint256(0),data);
        return true;
    }

    /**
     * @notice Basically a hugely pivotal function.
     *         Responsible for collecting the crv from gauge, and then redistributing to the correct place.
     *         Pays the caller a fee to process this.
     */
    function _earmarkRewards(uint256 _pid) internal {
        PoolInfo storage pool = poolInfo[_pid];
        require(pool.shutdown == false, "pool is closed");

        address gauge = pool.gauge;

        // If there is idle CRV in the Booster we need to transfer it out
        // in order that our accounting doesn't get screwed.
        uint256 crvBBalBefore = IERC20(crv).balanceOf(address(this));
        uint256 crvVBalBefore = IERC20(crv).balanceOf(staker);
        uint256 crvBalBefore = crvBBalBefore.add(crvVBalBefore);

        //claim crv
        IStaker(staker).claimCrv(gauge);

        //crv balance
        uint256 crvBalAfter = IERC20(crv).balanceOf(address(this));
        uint crvBal = crvBalAfter.sub(crvBalBefore);

        if(crvBalBefore > 0 && treasury != address(0)) {
            IERC20(crv).transfer(treasury, crvBalBefore);
        }

        //check if there are extra rewards
        address stash = pool.stash;
        if(stash != address(0)){
            //claim extra rewards
            IStash(stash).claimRewards();
            //process extra rewards
            IStash(stash).processStash();
        }

        if (crvBal > 0) {
            // LockIncentive = cvxCrv stakers (currently 10%)
            uint256 _lockIncentive = crvBal.mul(lockIncentive).div(FEE_DENOMINATOR);
            // StakerIncentive = cvx stakers (currently 5%)
            uint256 _stakerIncentive = crvBal.mul(stakerIncentive).div(FEE_DENOMINATOR);
            // CallIncentive = caller of this contract (currently 1%)
            uint256 _callIncentive = crvBal.mul(earmarkIncentive).div(FEE_DENOMINATOR);
            
            // Treasury = WETH-LIQ or liqLIT-LIT staking
            if(treasury != address(0) && treasury != address(this) && platformFee > 0){
                //only subtract after address condition check
                uint256 _platform = crvBal.mul(platformFee).div(FEE_DENOMINATOR);
                crvBal = crvBal.sub(_platform);
                IERC20(crv).safeTransfer(treasury, _platform);
            }

            //remove incentives from balance
            crvBal = crvBal.sub(_lockIncentive).sub(_callIncentive).sub(_stakerIncentive);

            //send incentives for calling
            IERC20(crv).safeTransfer(msg.sender, _callIncentive);          

            //send crv to lp provider reward contract
            address rewardContract = pool.crvRewards;
            IERC20(crv).safeTransfer(rewardContract, crvBal);
            IRewards(rewardContract).queueNewRewards(crvBal);

            //send lockers' share of crv to reward contract
            IERC20(crv).safeTransfer(lockRewards, _lockIncentive);
            IRewards(lockRewards).queueNewRewards(_lockIncentive);

            //send stakers's share of crv to reward contract
            IERC20(crv).safeTransfer(stakerRewards, _stakerIncentive);
            ILocker(stakerRewards).queueNewRewards(crv, _stakerIncentive);
        }
    }

    /**
     * @notice Basically a hugely pivotal function.
     *         Responsible for collecting the crv from gauge, and then redistributing to the correct place.
     *         Pays the caller a fee to process this.
     */
    function earmarkRewards(uint256 _pid) external nonReentrant returns(bool){
        require(!isShutdown,"shutdown");
        _earmarkRewards(_pid);
        return true;
    }

    /**
     * @notice Claim fees from curve distro contract, put in lockers' reward contract.
     *         lockFees is the secondary reward contract that uses the virtual balances from cvxCrv
     */
    function earmarkFees(address _feeToken) external nonReentrant returns(bool){
        require(!isShutdown,"shutdown");
        FeeDistro memory feeDistro = feeTokens[_feeToken];
        
        require(feeDistro.active, "Inactive distro");
        require(!gaugeMap[_feeToken], "Invalid token");

        //claim fee rewards
        uint256 tokenBalanceVBefore = IERC20(_feeToken).balanceOf(staker);
        uint256 tokenBalanceBBefore = IERC20(_feeToken).balanceOf(address(this));
        uint256 tokenBalanceBefore = tokenBalanceBBefore.add(tokenBalanceVBefore);
        IStaker(staker).claimFees(feeDistro.distro, _feeToken);
        uint256 tokenBalanceAfter = IERC20(_feeToken).balanceOf(address(this));
        uint256 feesClaimed = tokenBalanceAfter.sub(tokenBalanceBefore);

        //send fee rewards to reward contract
        IERC20(_feeToken).safeTransfer(feeDistro.rewards, feesClaimed);
        IRewards(feeDistro.rewards).queueNewRewards(feesClaimed);

        return true;
    }

    /**
     * @notice Callback from reward contract when crv is received.
     * @dev    Goes off and mints a relative amount of `CVX` based on the distribution schedule.
     */
    function rewardClaimed(uint256 _pid, address _address, uint256 _amount) external returns(bool){
        address rewardContract = poolInfo[_pid].crvRewards;
        require(msg.sender == rewardContract || msg.sender == lockRewards, "!auth");

        uint256 mintAmount = _amount.mul(getRewardMultipliers[msg.sender]).div(REWARD_MULTIPLIER_DENOMINATOR);

        if(mintAmount > 0) {
            //mint reward tokens
            ITokenMinter(minter).mint(_address, mintAmount);
        }
        
        return true;
    }
     

    /**
     * @dev Distribute fees from L2 to L1 reward contracts
     * @param _amount Amount of fees to distribute
     */
    function distributeL2Fees(uint256 _amount) external nonReentrant {
        require(msg.sender == bridgeDelegate, "!auth");

        // calculate the rewards that were paid based on the incentives that
        // are being distributed
        uint256 totalIncentives = lockIncentive.add(stakerIncentive);
        uint256 totalFarmed = _amount.mul(FEE_DENOMINATOR).div(totalIncentives);
        uint256 eligibleForMint = totalFarmed.sub(_amount);

        // Ensure that the total amount of rewards claimed per epoch is less than 70k
        uint256 epoch = block.timestamp.div(epochLength);
        l2FeesHistory[epoch] = l2FeesHistory[epoch].add(totalFarmed);
        require(l2FeesHistory[epoch] <= 70000e18, "Too many L2 Fees");

        // Calculate fees for individual reward contracts
        uint256 _lockIncentive = _amount.mul(lockIncentive).div(totalIncentives);
        uint256 _stakerIncentive = _amount.sub(_lockIncentive);

        //send lockers' share of crv to reward contract
        IERC20(crv).safeTransferFrom(bridgeDelegate, lockRewards, _lockIncentive);
        IRewards(lockRewards).queueNewRewards(_lockIncentive);

        //send stakers's share of crv to reward contract
        IERC20(crv).safeTransferFrom(bridgeDelegate, stakerRewards, _stakerIncentive);
        ILocker(stakerRewards).queueNewRewards(crv, _stakerIncentive);

        // Mint CVX to bridge delegate
        ITokenMinter(minter).mint(bridgeDelegate, eligibleForMint);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;



interface ICurveGauge {
    function deposit(uint256) external;
    function balanceOf(address) external view returns (uint256);
    function withdraw(uint256) external;
    function claim_rewards() external;
    function reward_tokens(uint256) external view returns(address);//v2
    function rewarded_token() external view returns(address);//v1
    function lp_token() external view returns(address);
}

interface ICurveVoteEscrow {
    function create_lock(uint256, uint256) external;
    function increase_amount(uint256) external;
    function increase_unlock_time(uint256) external;
    function withdraw() external;
    function smart_wallet_checker() external view returns (address);
    function commit_smart_wallet_checker(address) external;
    function apply_smart_wallet_checker() external;
}

interface IWalletChecker {
    function check(address) external view returns (bool);
    function approveWallet(address) external;
    function dao() external view returns (address);
}

interface IVoting{
    function vote(uint256, bool, bool) external; //voteId, support, executeIfDecided
    function getVote(uint256) external view returns(bool,bool,uint64,uint64,uint64,uint64,uint256,uint256,uint256,bytes memory); 
    function vote_for_gauge_weights(address,uint256) external;
}

interface IMinter{
    function mint(address) external;
}

interface IStaker{
    function deposit(address, address) external returns (bool);
    function withdraw(address) external returns (uint256);
    function withdraw(address, address, uint256) external returns (bool);
    function withdrawAll(address, address) external returns (bool);
    function createLock(uint256, uint256) external returns(bool);
    function increaseAmount(uint256) external returns(bool);
    function increaseTime(uint256) external returns(bool);
    function release() external returns(bool);
    function claimCrv(address) external returns (uint256);
    function claimRewards(address) external returns(bool);
    function claimFees(address,address) external returns (uint256);
    function setStashAccess(address, bool) external returns (bool);
    function vote(uint256,address,bool) external returns(bool);
    function voteGaugeWeight(address,uint256) external returns(bool);
    function balanceOfPool(address) external view returns (uint256);
    function operator() external view returns (address);
    function execute(address _to, uint256 _value, bytes calldata _data) external returns (bool, bytes memory);
    function setVote(bytes32 hash, bool valid) external;
    function migrate(address to) external;
}

interface IRewards{
    function stake(address, uint256) external;
    function stakeFor(address, uint256) external;
    function withdraw(address, uint256) external;
    function exit(address) external;
    function getReward(address) external;
    function queueNewRewards(uint256) external;
    function notifyRewardAmount(uint256) external;
    function addExtraReward(address) external;
    function extraRewardsLength() external view returns (uint256);
    function stakingToken() external view returns (address);
    function rewardToken() external view returns(address);
    function earned(address account) external view returns (uint256);
}

interface IStash{
    function stashRewards() external returns (bool);
    function processStash() external returns (bool);
    function claimRewards() external returns (bool);
    function initialize(uint256 _pid, address _operator, address _staker, address _gauge, address _rewardFactory) external;
    function setExtraReward(address) external;
}

interface IFeeDistributor {
    function claimToken(address user, address token) external returns (uint256);
    function claimTokens(address user, address[] calldata tokens) external returns (uint256[] memory);
    function getTokenTimeCursor(address token) external view returns (uint256);
}

interface ITokenMinter{
    function mint(address,uint256) external;
    function burn(address,uint256) external;
}

interface IDeposit{
    function isShutdown() external view returns(bool);
    function balanceOf(address _account) external view returns(uint256);
    function totalSupply() external view returns(uint256);
    function poolInfo(uint256) external view returns(address,address,address,address,address, bool);
    function rewardClaimed(uint256,address,uint256) external;
    function withdrawTo(uint256,uint256,address) external;
    function claimRewards(uint256,address) external returns(bool);
    function rewardArbitrator() external returns(address);
    function setGaugeRedirect(uint256 _pid) external returns(bool);
    function owner() external returns(address);
    function deposit(uint256 _pid, uint256 _amount, bool _stake) external returns(bool);
}

interface ICrvDeposit{
    function deposit(uint256, bool) external;
    function lockIncentive() external view returns(uint256);
}

interface IRewardFactory{
    function setAccess(address,bool) external;
    function CreateCrvRewards(uint256,address,address) external returns(address);
    function CreateTokenRewards(address,address,address) external returns(address);
    function activeRewardCount(address) external view returns(uint256);
    function addActiveReward(address,uint256) external returns(bool);
    function removeActiveReward(address,uint256) external returns(bool);
}

interface IStashFactory{
    function CreateStash(uint256,address,address,uint256) external returns(address);
    function setImplementation(address, address, address) external;
}

interface ITokenFactory{
    function CreateDepositToken(address) external returns(address);
}

interface IPools{
    function addPool(address _lptoken, address _gauge, uint256 _stashVersion) external returns(bool);
    function forceAddPool(address _lptoken, address _gauge, uint256 _stashVersion) external returns(bool);
    function shutdownPool(uint256 _pid) external returns(bool);
    function poolInfo(uint256) external view returns(address,address,address,address,address,bool);
    function poolLength() external view returns (uint256);
    function gaugeMap(address) external view returns(bool);
    function setPoolManager(address _poolM) external;
    function shutdownSystem() external;
    function setUsedAddress(address[] memory) external;
}

interface IVestedEscrow{
    function fund(address[] calldata _recipient, uint256[] calldata _amount) external returns(bool);
}

interface IRewardDeposit {
    function addReward(address, uint256) external;
}

interface ILocker {
    function lock(address _account, uint256 _amount) external;
    function checkpointEpoch() external;
    function epochCount() external view returns (uint256);
    function balanceAtEpochOf(uint256 _epoch, address _user) external view returns (uint256 amount);
    function totalSupplyAtEpoch(uint256 _epoch) external view returns (uint256 supply);
    function queueNewRewards(address _rewardsToken, uint256 reward) external;
    function getReward(address _account, bool _stake) external;
    function getReward(address _account) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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00000000000000000000000037aeb332d6e57112f1bfe36923a7ee670ee9278b000000000000000000000000d82fd4d6d62f89a1e50b1db69ad19932314aa408000000000000000000000000627fee87d0d9d2c55098a06ac805db8f98b158aa

-----Decoded View---------------
Arg [0] : _staker (address): 0x37aeB332D6E57112f1BFE36923a7ee670Ee9278b
Arg [1] : _minter (address): 0xD82fd4D6D62f89A1E50b1db69AD19932314aa408
Arg [2] : _crv (address): 0x627fee87d0D9D2c55098A06ac805Db8F98B158Aa

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000037aeb332d6e57112f1bfe36923a7ee670ee9278b
Arg [1] : 000000000000000000000000d82fd4d6d62f89a1e50b1db69ad19932314aa408
Arg [2] : 000000000000000000000000627fee87d0d9d2c55098a06ac805db8f98b158aa