Compare text

Find the difference between two text files

Real-time diff

Unified diff

Collapse lines

Highlight change

Syntax highlighting

Tools

MasterChef

Created 3 years agoDiff never expires

148 removals

332 lines

163 additions

347 lines

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import '@pancakeswap/pancake-swap-lib/contracts/math/SafeMath.sol';

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import '@pancakeswap/pancake-swap-lib/contracts/token/BEP20/IBEP20.sol';

import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";

import '@pancakeswap/pancake-swap-lib/contracts/token/BEP20/SafeBEP20.sol';

import "@openzeppelin/contracts/utils/EnumerableSet.sol";

import '@pancakeswap/pancake-swap-lib/contracts/access/Ownable.sol';

import "@openzeppelin/contracts/math/SafeMath.sol";

import "@openzeppelin/contracts/access/Ownable.sol";

import "./CakeToken.sol";

import "./SyrupBar.sol";

// import "@nomiclabs/buidler/console.sol";

import "./FinToken.sol";

import "./CaviarBar.sol";

interface IMigratorChef {

// Perform LP token migration from legacy PancakeSwap to CakeSwap.

// Perform LP token migration from legacy FinSwap to new FinSwap.

// Take the current LP token address and return the new LP token address.

// Migrator should have full access to the caller's LP token.

// Return the new LP token address.

// XXX Migrator must have allowance access to PancakeSwap LP tokens.

// XXX Migrator must have allowance access to FinSwap LP tokens.

// CakeSwap must mint EXACTLY the same amount of CakeSwap LP tokens or

// FinSwap must mint EXACTLY the same amount of FinSwap LP tokens or

// else something bad will happen. Traditional PancakeSwap does not

// else something bad will happen. Traditional FinSwap does not

// do that so be careful!

function migrate(IBEP20 token) external returns (IBEP20);

function migrate(IERC20 token) external returns (IERC20);

}

// MasterChef is the master of Cake. He can make Cake and he is a fair guy.

// MasterChef is the master of Fins. He can make Fins and he is a fair guy.

// Note that it's ownable and the owner wields tremendous power. The ownership

// will be transferred to a governance smart contract once CAKE is sufficiently

// will be transferred to a governance smart contract once FINS is sufficiently

// distributed and the community can show to govern itself.

// Have fun reading it. Hopefully it's bug-free. God bless.

contract MasterChef is Ownable {

using SafeMath for uint256;

using SafeBEP20 for IBEP20;

using SafeERC20 for IERC20;

// Info of each user.

struct UserInfo {

uint256 amount; // How many LP tokens the user has provided.

uint256 rewardDebt; // Reward debt. See explanation below.

// We do some fancy math here. Basically, any point in time, the amount of CAKEs

// We do some fancy math here. Basically, any point in time, the amount of FINSs

// entitled to a user but is pending to be distributed is:

// pending reward = (user.amount * pool.accCakePerShare) - user.rewardDebt

// pending reward = (user.amount * pool.accFinsPerShare) - user.rewardDebt

// Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:

// 1. The pool's `accCakePerShare` (and `lastRewardBlock`) gets updated.

// 1. The pool's `accFinsPerShare` (and `lastRewardTime`) gets updated.

// 2. User receives the pending reward sent to his/her address.

// 3. User's `amount` gets updated.

// 4. User's `rewardDebt` gets updated.

}

// Info of each pool.

struct PoolInfo {

IBEP20 lpToken; // Address of LP token contract.

IERC20 lpToken; // Address of LP token contract.

uint256 allocPoint; // How many allocation points assigned to this pool. CAKEs to distribute per block.

uint256 allocPoint; // How many allocation points assigned to this pool. FINS to distribute per block.

uint256 lastRewardBlock; // Last block number that CAKEs distribution occurs.

uint256 lastRewardTime; // Last block number that FINS distribution occurs.

uint256 accCakePerShare; // Accumulated CAKEs per share, times 1e12. See below.

uint256 accFinsPerShare; // Accumulated FINS per share, times 1e12. See below.

}

// The CAKE TOKEN!

// The FINS TOKEN!

CakeToken public cake;

FinToken public fins;

// The SYRUP TOKEN!

// The caviar TOKEN!

SyrupBar public syrup;

CaviarBar public caviar;

// Dev address.

address public devaddr;

// CAKE tokens created per block.

// FINS tokens created per second.

uint256 public cakePerBlock;

uint256 public finsPerSecond;

// Bonus muliplier for early cake makers.

// Max finsPerSecond keep never ol

uint256 public BONUS_MULTIPLIER = 1;

uint256 public constant maxFinsPerSecond = 1e18;

// The migrator contract. It has a lot of power. Can only be set through governance (owner).

IMigratorChef public migrator;

// Info of each pool.

PoolInfo[] public poolInfo;

// add the same LP token only once

mapping(address => bool) lpExists;

// Info of each user that stakes LP tokens.

mapping (uint256 => mapping (address => UserInfo)) public userInfo;

// Total allocation points. Must be the sum of all allocation points in all pools.

uint256 public totalAllocPoint = 0;

// The block number when CAKE mining starts.

// The block number when FINS mining starts.

uint256 public startBlock;

uint256 public startTime;

event Deposit(address indexed user, uint256 indexed pid, uint256 amount);

event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);

event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);

constructor(

CakeToken _cake,

FinToken _fins,

SyrupBar _syrup,

CaviarBar _caviar,

address _devaddr,

uint256 _cakePerBlock,

uint256 _finsPerSecond,

uint256 _startBlock

uint256 _startTime

) public {

cake = _cake;

fins = _fins;

syrup = _syrup;

caviar = _caviar;

devaddr = _devaddr;

cakePerBlock = _cakePerBlock;

finsPerSecond = _finsPerSecond;

startBlock = _startBlock;

startTime = _startTime;

// staking pool

poolInfo.push(PoolInfo({

lpToken: _cake,

lpToken: _fins,

allocPoint: 1000,

lastRewardBlock: startBlock,

lastRewardTime: startTime,

accCakePerShare: 0

accFinsPerShare: 0

}));

totalAllocPoint = 1000;

}

function updateMultiplier(uint256 multiplierNumber) public onlyOwner {

BONUS_MULTIPLIER = multiplierNumber;

}

function poolLength() external view returns (uint256) {

return poolInfo.length;

}

// Add a new lp to the pool. Can only be called by the owner.

// XXX DO NOT add the same LP token more than once. Rewards will be messed up if you do.

function add(uint256 _allocPoint, IBEP20 _lpToken, bool _withUpdate) public onlyOwner {

function add(uint256 _allocPoint, IERC20 _lpToken, bool _withUpdate) public onlyOwner {

require(!lpExists[address(_lpToken)], "!lpToken exists");

if (_withUpdate) {

massUpdatePools();

}

uint256 lastRewardBlock = block.number > startBlock ? block.number : startBlock;

uint256 lastRewardTime = block.timestamp > startTime ? block.timestamp : startTime;

totalAllocPoint = totalAllocPoint.add(_allocPoint);

poolInfo.push(PoolInfo({

lpToken: _lpToken,

allocPoint: _allocPoint,

lastRewardBlock: lastRewardBlock,

lastRewardTime: lastRewardTime,

accCakePerShare: 0

accFinsPerShare: 0

}));

updateStakingPool();

lpExists[address(_lpToken)] = true;

}

// Update the given pool's CAKE allocation point. Can only be called by the owner.

// Update the given pool's FINS allocation point. Can only be called by the owner.

function set(uint256 _pid, uint256 _allocPoint, bool _withUpdate) public onlyOwner {

if (_withUpdate) {

massUpdatePools();

}

uint256 prevAllocPoint = poolInfo[_pid].allocPoint;

poolInfo[_pid].allocPoint = _allocPoint;

if (prevAllocPoint != _allocPoint) {

totalAllocPoint = totalAllocPoint.sub(prevAllocPoint).add(_allocPoint);

updateStakingPool();

}

function updateStakingPool() internal {

uint256 length = poolInfo.length;

uint256 points = 0;

for (uint256 pid = 1; pid < length; ++pid) {

points = points.add(poolInfo[pid].allocPoint);

}

if (points != 0) {

points = points.div(3);

totalAllocPoint = totalAllocPoint.sub(poolInfo[0].allocPoint).add(points);

poolInfo[0].allocPoint = points;

}

// Set the migrator contract. Can only be called by the owner.

function setMigrator(IMigratorChef _migrator) public onlyOwner {

migrator = _migrator;

}

// Migrate lp token to another lp contract. Can be called by anyone. We trust that migrator contract is good.

function migrate(uint256 _pid) public {

require(address(migrator) != address(0), "migrate: no migrator");

PoolInfo storage pool = poolInfo[_pid];

IBEP20 lpToken = pool.lpToken;

IERC20 lpToken = pool.lpToken;

uint256 bal = lpToken.balanceOf(address(this));

lpToken.safeApprove(address(migrator), bal);

IBEP20 newLpToken = migrator.migrate(lpToken);

IERC20 newLpToken = migrator.migrate(lpToken);

require(bal == newLpToken.balanceOf(address(this)), "migrate: bad");

pool.lpToken = newLpToken;

}

// Return reward multiplier over the given _from to _to block.

function getMultiplier(uint256 _from, uint256 _to) public view returns (uint256) {

return _to.sub(_from).mul(BONUS_MULTIPLIER);

_from = _from > startTime ? _from : startTime;

if (_to < startTime) {

return 0;

}

return _to.sub(_from);

}

// View function to see pending CAKEs on frontend.

// View function to see pending FINS on frontend.

function pendingCake(uint256 _pid, address _user) external view returns (uint256) {

function pendingFins(uint256 _pid, address _user) external view returns (uint256) {

PoolInfo storage pool = poolInfo[_pid];

UserInfo storage user = userInfo[_pid][_user];

uint256 accCakePerShare = pool.accCakePerShare;

uint256 accFinsPerShare = pool.accFinsPerShare;

uint256 lpSupply = pool.lpToken.balanceOf(address(this));

if (block.number > pool.lastRewardBlock && lpSupply != 0) {

if (block.timestamp > pool.lastRewardTime && lpSupply != 0) {

uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);

uint256 multiplier = getMultiplier(pool.lastRewardTime, block.timestamp);

uint256 cakeReward = multiplier.mul(cakePerBlock).mul(pool.allocPoint).div(totalAllocPoint);

uint256 finsReward = multiplier.mul(finsPerSecond).mul(pool.allocPoint).div(totalAllocPoint);

accCakePerShare = accCakePerShare.add(cakeReward.mul(1e12).div(lpSupply));

accFinsPerShare = accFinsPerShare.add(finsReward.mul(1e12).div(lpSupply));

}

return user.amount.mul(accCakePerShare).div(1e12).sub(user.rewardDebt);

return user.amount.mul(accFinsPerShare).div(1e12).sub(user.rewardDebt);

}

// Update reward variables for all pools. Be careful of gas spending!

function massUpdatePools() public {

uint256 length = poolInfo.length;

for (uint256 pid = 0; pid < length; ++pid) {

updatePool(pid);

}

// Update reward variables of the given pool to be up-to-date.

function updatePool(uint256 _pid) public {

PoolInfo storage pool = poolInfo[_pid];

if (block.number <= pool.lastRewardBlock) {

if (block.timestamp <= pool.lastRewardTime) {

return;

}

uint256 lpSupply = pool.lpToken.balanceOf(address(this));

if (lpSupply == 0) {

pool.lastRewardBlock = block.number;

pool.lastRewardTime = block.timestamp;

return;

}

uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);

uint256 multiplier = getMultiplier(pool.lastRewardTime, block.timestamp);

uint256 cakeReward = multiplier.mul(cakePerBlock).mul(pool.allocPoint).div(totalAllocPoint);

uint256 finsReward = multiplier.mul(finsPerSecond).mul(pool.allocPoint).div(totalAllocPoint);

cake.mint(devaddr, cakeReward.div(10));

fins.mint(devaddr, finsReward.div(10));

cake.mint(address(syrup), cakeReward);

fins.mint(address(caviar), finsReward);

pool.accCakePerShare = pool.accCakePerShare.add(cakeReward.mul(1e12).div(lpSupply));

pool.accFinsPerShare = pool.accFinsPerShare.add(finsReward.mul(1e12).div(lpSupply));

pool.lastRewardBlock = block.number;

pool.lastRewardTime = block.timestamp;

}

// Deposit LP tokens to MasterChef for CAKE allocation.

// Deposit LP tokens to MasterChef for FINS allocation.

function deposit(uint256 _pid, uint256 _amount) public {

require (_pid != 0, 'deposit CAKE by staking');

require (_pid != 0, 'deposit FINS by staking');

PoolInfo storage pool = poolInfo[_pid];

UserInfo storage user = userInfo[_pid][msg.sender];

updatePool(_pid);

if (user.amount > 0) {

uint256 pending = user.amount.mul(pool.accCakePerShare).div(1e12).sub(user.rewardDebt);

uint256 pending = user.amount.mul(pool.accFinsPerShare).div(1e12).sub(user.rewardDebt);

if(pending > 0) {

safeCakeTransfer(msg.sender, pending);

safeFinsTransfer(msg.sender, pending);

}

if (_amount > 0) {

pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);

user.amount = user.amount.add(_amount);

}

user.rewardDebt = user.amount.mul(pool.accCakePerShare).div(1e12);

user.rewardDebt = user.amount.mul(pool.accFinsPerShare).div(1e12);

emit Deposit(msg.sender, _pid, _amount);

}

// Withdraw LP tokens from MasterChef.

function withdraw(uint256 _pid, uint256 _amount) public {

require (_pid != 0, 'withdraw CAKE by unstaking');

require (_pid != 0, 'withdraw FINS by unstaking');

PoolInfo storage pool = poolInfo[_pid];

UserInfo storage user = userInfo[_pid][msg.sender];

require(user.amount >= _amount, "withdraw: not good");

updatePool(_pid);

uint256 pending = user.amount.mul(pool.accCakePerShare).div(1e12).sub(user.rewardDebt);

uint256 pending = user.amount.mul(pool.accFinsPerShare).div(1e12).sub(user.rewardDebt);

if(pending > 0) {

safeCakeTransfer(msg.sender, pending);

safeFinsTransfer(msg.sender, pending);

}

if(_amount > 0) {

user.amount = user.amount.sub(_amount);

pool.lpToken.safeTransfer(address(msg.sender), _amount);

}

user.rewardDebt = user.amount.mul(pool.accCakePerShare).div(1e12);

user.rewardDebt = user.amount.mul(pool.accFinsPerShare).div(1e12);

emit Withdraw(msg.sender, _pid, _amount);

}

// Stake CAKE tokens to MasterChef

// Stake FINS tokens to MasterChef

function enterStaking(uint256 _amount) public {

PoolInfo storage pool = poolInfo[0];

UserInfo storage user = userInfo[0][msg.sender];

updatePool(0);

if (user.amount > 0) {

uint256 pending = user.amount.mul(pool.accCakePerShare).div(1e12).sub(user.rewardDebt);

uint256 pending = user.amount.mul(pool.accFinsPerShare).div(1e12).sub(user.rewardDebt);

if(pending > 0) {

safeCakeTransfer(msg.sender, pending);

safeFinsTransfer(msg.sender, pending);

}

if(_amount > 0) {

pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);

user.amount = user.amount.add(_amount);

}

user.rewardDebt = user.amount.mul(pool.accCakePerShare).div(1e12);

user.rewardDebt = user.amount.mul(pool.accFinsPerShare).div(1e12);

syrup.mint(msg.sender, _amount);

caviar.mint(msg.sender, _amount);

emit Deposit(msg.sender, 0, _amount);

}

// Withdraw CAKE tokens from STAKING.

// Withdraw FINS tokens from STAKING.

function leaveStaking(uint256 _amount) public {

PoolInfo storage pool = poolInfo[0];

UserInfo storage user = userInfo[0][msg.sender];

require(user.amount >= _amount, "withdraw: not good");

updatePool(0);

uint256 pending = user.amount.mul(pool.accCakePerShare).div(1e12).sub(user.rewardDebt);

uint256 pending = user.amount.mul(pool.accFinsPerShare).div(1e12).sub(user.rewardDebt);

if(pending > 0) {

safeCakeTransfer(msg.sender, pending);

safeFinsTransfer(msg.sender, pending);

}

if(_amount > 0) {

user.amount = user.amount.sub(_amount);

pool.lpToken.safeTransfer(address(msg.sender), _amount);

}

user.rewardDebt = user.amount.mul(pool.accCakePerShare).div(1e12);

user.rewardDebt = user.amount.mul(pool.accFinsPerShare).div(1e12);

syrup.burn(msg.sender, _amount);

caviar.burn(msg.sender, _amount);

emit Withdraw(msg.sender, 0, _amount);

}

// Withdraw without caring about rewards. EMERGENCY ONLY.

function emergencyWithdraw(uint256 _pid) public {

PoolInfo storage pool = poolInfo[_pid];

UserInfo storage user = userInfo[_pid][msg.sender];

pool.lpToken.safeTransfer(address(msg.sender), user.amount);

emit EmergencyWithdraw(msg.sender, _pid, user.amount);

user.amount = 0;

user.rewardDebt = 0;

}

// Safe cake transfer function, just in case if rounding error causes pool to not have enough CAKEs.

// Safe fins transfer function, just in case if rounding error causes pool to not have enough fins.

function safeCakeTransfer(address _to, uint256 _amount) internal {

function safeFinsTransfer(address _to, uint256 _amount) internal {

syrup.safeCakeTransfer(_to, _amount);

caviar.safeFinsTransfer(_to, _amount);

}

// Update dev address by the previous dev.

function dev(address _devaddr) public {

function setDevAddress(address _devaddr) public {

require(msg.sender == devaddr, "dev: wut?");

devaddr = _devaddr;

}

function setFinsPerSecond(uint256 _finsPerSecond) public onlyOwner {

require(_finsPerSecond <= maxFinsPerSecond, "finsPerSecond: ol?");

massUpdatePools();

finsPerSecond = _finsPerSecond;

}

Saved diffs

Original text

Open file

pragma solidity 0.6.12;

import '@pancakeswap/pancake-swap-lib/contracts/math/SafeMath.sol';
import '@pancakeswap/pancake-swap-lib/contracts/token/BEP20/IBEP20.sol';
import '@pancakeswap/pancake-swap-lib/contracts/token/BEP20/SafeBEP20.sol';
import '@pancakeswap/pancake-swap-lib/contracts/access/Ownable.sol';

import "./CakeToken.sol";
import "./SyrupBar.sol";

// import "@nomiclabs/buidler/console.sol";

interface IMigratorChef {
    // Perform LP token migration from legacy PancakeSwap to CakeSwap.
    // Take the current LP token address and return the new LP token address.
    // Migrator should have full access to the caller's LP token.
    // Return the new LP token address.
    //
    // XXX Migrator must have allowance access to PancakeSwap LP tokens.
    // CakeSwap must mint EXACTLY the same amount of CakeSwap LP tokens or
    // else something bad will happen. Traditional PancakeSwap does not
    // do that so be careful!
    function migrate(IBEP20 token) external returns (IBEP20);
}

// MasterChef is the master of Cake. He can make Cake and he is a fair guy.
//
// Note that it's ownable and the owner wields tremendous power. The ownership
// will be transferred to a governance smart contract once CAKE is sufficiently
// distributed and the community can show to govern itself.
//
// Have fun reading it. Hopefully it's bug-free. God bless.
contract MasterChef is Ownable {
    using SafeMath for uint256;
    using SafeBEP20 for IBEP20;

    // Info of each user.
    struct UserInfo {
        uint256 amount;     // How many LP tokens the user has provided.
        uint256 rewardDebt; // Reward debt. See explanation below.
        //
        // We do some fancy math here. Basically, any point in time, the amount of CAKEs
        // entitled to a user but is pending to be distributed is:
        //
        //   pending reward = (user.amount * pool.accCakePerShare) - user.rewardDebt
        //
        // Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:
        //   1. The pool's `accCakePerShare` (and `lastRewardBlock`) gets updated.
        //   2. User receives the pending reward sent to his/her address.
        //   3. User's `amount` gets updated.
        //   4. User's `rewardDebt` gets updated.
    }

    // Info of each pool.
    struct PoolInfo {
        IBEP20 lpToken;           // Address of LP token contract.
        uint256 allocPoint;       // How many allocation points assigned to this pool. CAKEs to distribute per block.
        uint256 lastRewardBlock;  // Last block number that CAKEs distribution occurs.
        uint256 accCakePerShare; // Accumulated CAKEs per share, times 1e12. See below.
    }

    // The CAKE TOKEN!
    CakeToken public cake;
    // The SYRUP TOKEN!
    SyrupBar public syrup;
    // Dev address.
    address public devaddr;
    // CAKE tokens created per block.
    uint256 public cakePerBlock;
    // Bonus muliplier for early cake makers.
    uint256 public BONUS_MULTIPLIER = 1;
    // The migrator contract. It has a lot of power. Can only be set through governance (owner).
    IMigratorChef public migrator;

    // Info of each pool.
    PoolInfo[] public poolInfo;
    // Info of each user that stakes LP tokens.
    mapping (uint256 => mapping (address => UserInfo)) public userInfo;
    // Total allocation points. Must be the sum of all allocation points in all pools.
    uint256 public totalAllocPoint = 0;
    // The block number when CAKE mining starts.
    uint256 public startBlock;

    event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
    event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
    event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);

    constructor(
        CakeToken _cake,
        SyrupBar _syrup,
        address _devaddr,
        uint256 _cakePerBlock,
        uint256 _startBlock
    ) public {
        cake = _cake;
        syrup = _syrup;
        devaddr = _devaddr;
        cakePerBlock = _cakePerBlock;
        startBlock = _startBlock;

        // staking pool
        poolInfo.push(PoolInfo({
            lpToken: _cake,
            allocPoint: 1000,
            lastRewardBlock: startBlock,
            accCakePerShare: 0
        }));

        totalAllocPoint = 1000;

    }

    function updateMultiplier(uint256 multiplierNumber) public onlyOwner {
        BONUS_MULTIPLIER = multiplierNumber;
    }

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

    // Add a new lp to the pool. Can only be called by the owner.
    // XXX DO NOT add the same LP token more than once. Rewards will be messed up if you do.
    function add(uint256 _allocPoint, IBEP20 _lpToken, bool _withUpdate) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }
        uint256 lastRewardBlock = block.number > startBlock ? block.number : startBlock;
        totalAllocPoint = totalAllocPoint.add(_allocPoint);
        poolInfo.push(PoolInfo({
            lpToken: _lpToken,
            allocPoint: _allocPoint,
            lastRewardBlock: lastRewardBlock,
            accCakePerShare: 0
        }));
        updateStakingPool();
    }

    // Update the given pool's CAKE allocation point. Can only be called by the owner.
    function set(uint256 _pid, uint256 _allocPoint, bool _withUpdate) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }
        uint256 prevAllocPoint = poolInfo[_pid].allocPoint;
        poolInfo[_pid].allocPoint = _allocPoint;
        if (prevAllocPoint != _allocPoint) {
            totalAllocPoint = totalAllocPoint.sub(prevAllocPoint).add(_allocPoint);
            updateStakingPool();
        }
    }

    function updateStakingPool() internal {
        uint256 length = poolInfo.length;
        uint256 points = 0;
        for (uint256 pid = 1; pid < length; ++pid) {
            points = points.add(poolInfo[pid].allocPoint);
        }
        if (points != 0) {
            points = points.div(3);
            totalAllocPoint = totalAllocPoint.sub(poolInfo[0].allocPoint).add(points);
            poolInfo[0].allocPoint = points;
        }
    }

    // Set the migrator contract. Can only be called by the owner.
    function setMigrator(IMigratorChef _migrator) public onlyOwner {
        migrator = _migrator;
    }

    // Migrate lp token to another lp contract. Can be called by anyone. We trust that migrator contract is good.
    function migrate(uint256 _pid) public {
        require(address(migrator) != address(0), "migrate: no migrator");
        PoolInfo storage pool = poolInfo[_pid];
        IBEP20 lpToken = pool.lpToken;
        uint256 bal = lpToken.balanceOf(address(this));
        lpToken.safeApprove(address(migrator), bal);
        IBEP20 newLpToken = migrator.migrate(lpToken);
        require(bal == newLpToken.balanceOf(address(this)), "migrate: bad");
        pool.lpToken = newLpToken;
    }

    // Return reward multiplier over the given _from to _to block.
    function getMultiplier(uint256 _from, uint256 _to) public view returns (uint256) {
        return _to.sub(_from).mul(BONUS_MULTIPLIER);
    }

    // View function to see pending CAKEs on frontend.
    function pendingCake(uint256 _pid, address _user) external view returns (uint256) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
        uint256 accCakePerShare = pool.accCakePerShare;
        uint256 lpSupply = pool.lpToken.balanceOf(address(this));
        if (block.number > pool.lastRewardBlock && lpSupply != 0) {
            uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
            uint256 cakeReward = multiplier.mul(cakePerBlock).mul(pool.allocPoint).div(totalAllocPoint);
            accCakePerShare = accCakePerShare.add(cakeReward.mul(1e12).div(lpSupply));
        }
        return user.amount.mul(accCakePerShare).div(1e12).sub(user.rewardDebt);
    }

    // Update reward variables for all pools. Be careful of gas spending!
    function massUpdatePools() public {
        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            updatePool(pid);
        }
    }


    // Update reward variables of the given pool to be up-to-date.
    function updatePool(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        if (block.number <= pool.lastRewardBlock) {
            return;
        }
        uint256 lpSupply = pool.lpToken.balanceOf(address(this));
        if (lpSupply == 0) {
            pool.lastRewardBlock = block.number;
            return;
        }
        uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
        uint256 cakeReward = multiplier.mul(cakePerBlock).mul(pool.allocPoint).div(totalAllocPoint);
        cake.mint(devaddr, cakeReward.div(10));
        cake.mint(address(syrup), cakeReward);
        pool.accCakePerShare = pool.accCakePerShare.add(cakeReward.mul(1e12).div(lpSupply));
        pool.lastRewardBlock = block.number;
    }

    // Deposit LP tokens to MasterChef for CAKE allocation.
    function deposit(uint256 _pid, uint256 _amount) public {

        require (_pid != 0, 'deposit CAKE by staking');

        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        updatePool(_pid);
        if (user.amount > 0) {
            uint256 pending = user.amount.mul(pool.accCakePerShare).div(1e12).sub(user.rewardDebt);
            if(pending > 0) {
                safeCakeTransfer(msg.sender, pending);
            }
        }
        if (_amount > 0) {
            pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
            user.amount = user.amount.add(_amount);
        }
        user.rewardDebt = user.amount.mul(pool.accCakePerShare).div(1e12);
        emit Deposit(msg.sender, _pid, _amount);
    }

    // Withdraw LP tokens from MasterChef.
    function withdraw(uint256 _pid, uint256 _amount) public {

        require (_pid != 0, 'withdraw CAKE by unstaking');
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        require(user.amount >= _amount, "withdraw: not good");

        updatePool(_pid);
        uint256 pending = user.amount.mul(pool.accCakePerShare).div(1e12).sub(user.rewardDebt);
        if(pending > 0) {
            safeCakeTransfer(msg.sender, pending);
        }
        if(_amount > 0) {
            user.amount = user.amount.sub(_amount);
            pool.lpToken.safeTransfer(address(msg.sender), _amount);
        }
        user.rewardDebt = user.amount.mul(pool.accCakePerShare).div(1e12);
        emit Withdraw(msg.sender, _pid, _amount);
    }

    // Stake CAKE tokens to MasterChef
    function enterStaking(uint256 _amount) public {
        PoolInfo storage pool = poolInfo[0];
        UserInfo storage user = userInfo[0][msg.sender];
        updatePool(0);
        if (user.amount > 0) {
            uint256 pending = user.amount.mul(pool.accCakePerShare).div(1e12).sub(user.rewardDebt);
            if(pending > 0) {
                safeCakeTransfer(msg.sender, pending);
            }
        }
        if(_amount > 0) {
            pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
            user.amount = user.amount.add(_amount);
        }
        user.rewardDebt = user.amount.mul(pool.accCakePerShare).div(1e12);

        syrup.mint(msg.sender, _amount);
        emit Deposit(msg.sender, 0, _amount);
    }

    // Withdraw CAKE tokens from STAKING.
    function leaveStaking(uint256 _amount) public {
        PoolInfo storage pool = poolInfo[0];
        UserInfo storage user = userInfo[0][msg.sender];
        require(user.amount >= _amount, "withdraw: not good");
        updatePool(0);
        uint256 pending = user.amount.mul(pool.accCakePerShare).div(1e12).sub(user.rewardDebt);
        if(pending > 0) {
            safeCakeTransfer(msg.sender, pending);
        }
        if(_amount > 0) {
            user.amount = user.amount.sub(_amount);
            pool.lpToken.safeTransfer(address(msg.sender), _amount);
        }
        user.rewardDebt = user.amount.mul(pool.accCakePerShare).div(1e12);

        syrup.burn(msg.sender, _amount);
        emit Withdraw(msg.sender, 0, _amount);
    }

    // Withdraw without caring about rewards. EMERGENCY ONLY.
    function emergencyWithdraw(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        pool.lpToken.safeTransfer(address(msg.sender), user.amount);
        emit EmergencyWithdraw(msg.sender, _pid, user.amount);
        user.amount = 0;
        user.rewardDebt = 0;
    }

    // Safe cake transfer function, just in case if rounding error causes pool to not have enough CAKEs.
    function safeCakeTransfer(address _to, uint256 _amount) internal {
        syrup.safeCakeTransfer(_to, _amount);
    }

    // Update dev address by the previous dev.
    function dev(address _devaddr) public {
        require(msg.sender == devaddr, "dev: wut?");
        devaddr = _devaddr;
    }
}

Changed text

Open file

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

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/utils/EnumerableSet.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

import "./FinToken.sol";
import "./CaviarBar.sol";

interface IMigratorChef {
    // Perform LP token migration from legacy FinSwap to new FinSwap.
    // Take the current LP token address and return the new LP token address.
    // Migrator should have full access to the caller's LP token.
    // Return the new LP token address.
    //
    // XXX Migrator must have allowance access to FinSwap LP tokens.
    // FinSwap must mint EXACTLY the same amount of FinSwap LP tokens or
    // else something bad will happen. Traditional FinSwap does not
    // do that so be careful!
    function migrate(IERC20 token) external returns (IERC20);
}

// MasterChef is the master of Fins. He can make Fins and he is a fair guy.
//
// Note that it's ownable and the owner wields tremendous power. The ownership
// will be transferred to a governance smart contract once FINS is sufficiently
// distributed and the community can show to govern itself.
//
// Have fun reading it. Hopefully it's bug-free. God bless.
contract MasterChef is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    // Info of each user.
    struct UserInfo {
        uint256 amount;     // How many LP tokens the user has provided.
        uint256 rewardDebt; // Reward debt. See explanation below.
        //
        // We do some fancy math here. Basically, any point in time, the amount of FINSs
        // entitled to a user but is pending to be distributed is:
        //
        //   pending reward = (user.amount * pool.accFinsPerShare) - user.rewardDebt
        //
        // Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:
        //   1. The pool's `accFinsPerShare` (and `lastRewardTime`) gets updated.
        //   2. User receives the pending reward sent to his/her address.
        //   3. User's `amount` gets updated.
        //   4. User's `rewardDebt` gets updated.
    }

    // Info of each pool.
    struct PoolInfo {
        IERC20 lpToken;           // Address of LP token contract.
        uint256 allocPoint;       // How many allocation points assigned to this pool. FINS to distribute per block.
        uint256 lastRewardTime;  // Last block number that FINS distribution occurs.
        uint256 accFinsPerShare; // Accumulated FINS per share, times 1e12. See below.
    }

    // The FINS TOKEN!
    FinToken public fins;
    // The caviar TOKEN!
    CaviarBar public caviar;
    // Dev address.
    address public devaddr;
    // FINS tokens created per second.
    uint256 public finsPerSecond;
    // Max finsPerSecond keep never ol
    uint256 public constant maxFinsPerSecond = 1e18;

    // The migrator contract. It has a lot of power. Can only be set through governance (owner).
    IMigratorChef public migrator;

    // Info of each pool.
    PoolInfo[] public poolInfo;

    // add the same LP token only once
    mapping(address => bool) lpExists;

    // Info of each user that stakes LP tokens.
    mapping (uint256 => mapping (address => UserInfo)) public userInfo;
    // Total allocation points. Must be the sum of all allocation points in all pools.
    uint256 public totalAllocPoint = 0;
    // The block number when FINS mining starts.
    uint256 public startTime;

    event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
    event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
    event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);

    constructor(
        FinToken _fins,
        CaviarBar _caviar,
        address _devaddr,
        uint256 _finsPerSecond,
        uint256 _startTime
    ) public {
        fins = _fins;
        caviar = _caviar;
        devaddr = _devaddr;
        finsPerSecond = _finsPerSecond;
        startTime = _startTime;

        // staking pool
        poolInfo.push(PoolInfo({
            lpToken: _fins,
            allocPoint: 1000,
            lastRewardTime: startTime,
            accFinsPerShare: 0
        }));

        totalAllocPoint = 1000;

    }

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

    // Add a new lp to the pool. Can only be called by the owner.
    // XXX DO NOT add the same LP token more than once. Rewards will be messed up if you do.
    function add(uint256 _allocPoint, IERC20 _lpToken, bool _withUpdate) public onlyOwner {
        require(!lpExists[address(_lpToken)], "!lpToken exists");

        if (_withUpdate) {
            massUpdatePools();
        }
        uint256 lastRewardTime = block.timestamp > startTime ? block.timestamp : startTime;
        totalAllocPoint = totalAllocPoint.add(_allocPoint);
        poolInfo.push(PoolInfo({
            lpToken: _lpToken,
            allocPoint: _allocPoint,
            lastRewardTime: lastRewardTime,
            accFinsPerShare: 0
        }));
        updateStakingPool();
        
        lpExists[address(_lpToken)] = true;
    }

    // Update the given pool's FINS allocation point. Can only be called by the owner.
    function set(uint256 _pid, uint256 _allocPoint, bool _withUpdate) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }
        uint256 prevAllocPoint = poolInfo[_pid].allocPoint;
        poolInfo[_pid].allocPoint = _allocPoint;
        if (prevAllocPoint != _allocPoint) {
            totalAllocPoint = totalAllocPoint.sub(prevAllocPoint).add(_allocPoint);
            updateStakingPool();
        }
    }

    function updateStakingPool() internal {
        uint256 length = poolInfo.length;
        uint256 points = 0;
        for (uint256 pid = 1; pid < length; ++pid) {
            points = points.add(poolInfo[pid].allocPoint);
        }
        if (points != 0) {
            points = points.div(3);
            totalAllocPoint = totalAllocPoint.sub(poolInfo[0].allocPoint).add(points);
            poolInfo[0].allocPoint = points;
        }
    }

    // Set the migrator contract. Can only be called by the owner.
    function setMigrator(IMigratorChef _migrator) public onlyOwner {
        migrator = _migrator;
    }

    // Migrate lp token to another lp contract. Can be called by anyone. We trust that migrator contract is good.
    function migrate(uint256 _pid) public {
        require(address(migrator) != address(0), "migrate: no migrator");
        PoolInfo storage pool = poolInfo[_pid];
        IERC20 lpToken = pool.lpToken;
        uint256 bal = lpToken.balanceOf(address(this));
        lpToken.safeApprove(address(migrator), bal);
        IERC20 newLpToken = migrator.migrate(lpToken);
        require(bal == newLpToken.balanceOf(address(this)), "migrate: bad");
        pool.lpToken = newLpToken;
    }

    // Return reward multiplier over the given _from to _to block.
    function getMultiplier(uint256 _from, uint256 _to) public view returns (uint256) {
        _from = _from > startTime ? _from : startTime;
        if (_to < startTime) {
            return 0;
        }
        return _to.sub(_from);
    }

    // View function to see pending FINS on frontend.
    function pendingFins(uint256 _pid, address _user) external view returns (uint256) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
        uint256 accFinsPerShare = pool.accFinsPerShare;
        uint256 lpSupply = pool.lpToken.balanceOf(address(this));
        if (block.timestamp > pool.lastRewardTime && lpSupply != 0) {
            uint256 multiplier = getMultiplier(pool.lastRewardTime, block.timestamp);
            uint256 finsReward = multiplier.mul(finsPerSecond).mul(pool.allocPoint).div(totalAllocPoint);
            accFinsPerShare = accFinsPerShare.add(finsReward.mul(1e12).div(lpSupply));
        }
        return user.amount.mul(accFinsPerShare).div(1e12).sub(user.rewardDebt);
    }

    // Update reward variables for all pools. Be careful of gas spending!
    function massUpdatePools() public {
        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            updatePool(pid);
        }
    }


    // Update reward variables of the given pool to be up-to-date.
    function updatePool(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        if (block.timestamp <= pool.lastRewardTime) {
            return;
        }
        uint256 lpSupply = pool.lpToken.balanceOf(address(this));
        if (lpSupply == 0) {
            pool.lastRewardTime = block.timestamp;
            return;
        }
        uint256 multiplier = getMultiplier(pool.lastRewardTime, block.timestamp);
        uint256 finsReward = multiplier.mul(finsPerSecond).mul(pool.allocPoint).div(totalAllocPoint);
        fins.mint(devaddr, finsReward.div(10));
        fins.mint(address(caviar), finsReward);
        pool.accFinsPerShare = pool.accFinsPerShare.add(finsReward.mul(1e12).div(lpSupply));
        pool.lastRewardTime = block.timestamp;
    }

    // Deposit LP tokens to MasterChef for FINS allocation.
    function deposit(uint256 _pid, uint256 _amount) public {

        require (_pid != 0, 'deposit FINS by staking');

        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        updatePool(_pid);
        if (user.amount > 0) {
            uint256 pending = user.amount.mul(pool.accFinsPerShare).div(1e12).sub(user.rewardDebt);
            if(pending > 0) {
                safeFinsTransfer(msg.sender, pending);
            }
        }
        if (_amount > 0) {
            pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
            user.amount = user.amount.add(_amount);
        }
        user.rewardDebt = user.amount.mul(pool.accFinsPerShare).div(1e12);
        emit Deposit(msg.sender, _pid, _amount);
    }

    // Withdraw LP tokens from MasterChef.
    function withdraw(uint256 _pid, uint256 _amount) public {

        require (_pid != 0, 'withdraw FINS by unstaking');
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        require(user.amount >= _amount, "withdraw: not good");

        updatePool(_pid);
        uint256 pending = user.amount.mul(pool.accFinsPerShare).div(1e12).sub(user.rewardDebt);
        if(pending > 0) {
            safeFinsTransfer(msg.sender, pending);
        }
        if(_amount > 0) {
            user.amount = user.amount.sub(_amount);
            pool.lpToken.safeTransfer(address(msg.sender), _amount);
        }
        user.rewardDebt = user.amount.mul(pool.accFinsPerShare).div(1e12);
        emit Withdraw(msg.sender, _pid, _amount);
    }

    // Stake FINS tokens to MasterChef
    function enterStaking(uint256 _amount) public {
        PoolInfo storage pool = poolInfo[0];
        UserInfo storage user = userInfo[0][msg.sender];
        updatePool(0);
        if (user.amount > 0) {
            uint256 pending = user.amount.mul(pool.accFinsPerShare).div(1e12).sub(user.rewardDebt);
            if(pending > 0) {
                safeFinsTransfer(msg.sender, pending);
            }
        }
        if(_amount > 0) {
            pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
            user.amount = user.amount.add(_amount);
        }
        user.rewardDebt = user.amount.mul(pool.accFinsPerShare).div(1e12);

        caviar.mint(msg.sender, _amount);
        emit Deposit(msg.sender, 0, _amount);
    }

    // Withdraw FINS tokens from STAKING.
    function leaveStaking(uint256 _amount) public {
        PoolInfo storage pool = poolInfo[0];
        UserInfo storage user = userInfo[0][msg.sender];
        require(user.amount >= _amount, "withdraw: not good");
        updatePool(0);
        uint256 pending = user.amount.mul(pool.accFinsPerShare).div(1e12).sub(user.rewardDebt);
        if(pending > 0) {
            safeFinsTransfer(msg.sender, pending);
        }
        if(_amount > 0) {
            user.amount = user.amount.sub(_amount);
            pool.lpToken.safeTransfer(address(msg.sender), _amount);
        }
        user.rewardDebt = user.amount.mul(pool.accFinsPerShare).div(1e12);

        caviar.burn(msg.sender, _amount);
        emit Withdraw(msg.sender, 0, _amount);
    }

    // Withdraw without caring about rewards. EMERGENCY ONLY.
    function emergencyWithdraw(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        pool.lpToken.safeTransfer(address(msg.sender), user.amount);
        emit EmergencyWithdraw(msg.sender, _pid, user.amount);
        user.amount = 0;
        user.rewardDebt = 0;
    }

    // Safe fins transfer function, just in case if rounding error causes pool to not have enough fins.
    function safeFinsTransfer(address _to, uint256 _amount) internal {
        caviar.safeFinsTransfer(_to, _amount);
    }

    // Update dev address by the previous dev.
    function setDevAddress(address _devaddr) public {
        require(msg.sender == devaddr, "dev: wut?");
        devaddr = _devaddr;
    }

    function setFinsPerSecond(uint256 _finsPerSecond) public onlyOwner {
        require(_finsPerSecond <= maxFinsPerSecond, "finsPerSecond: ol?");
        massUpdatePools();
        finsPerSecond = _finsPerSecond;
    }
}