Cheers Land Farm - Smart Contract Audit Report

Summary

Cheers Land Farm is a new yield farming contract that pays rewards to stakers in designated rewards tokens.

Notes on the CheersLpPool Contract:

• This contract allows anyone to stake a single asset determined by the project team in exchange for rewards.
• On initialization, the owner must specify the rewards token, the staking token, and the start of the staking period; rewards will stop being distributed 90 days after the start date.
• The team must exercise caution when deciding the staking token to avoid fee-on-transfer and ERC777-compliant tokens (this is uncommon).


• If a threshold value of staking tokens is reached during a deposit, users may be whitelisted in various "association pools".
• If a user falls below the threshold value of an association pool during a withdrawal, they may be removed from the whitelist for that association pool.
• The threshold value for each pool is independent and may be different for each pool.
• The team should exercise caution to not add too many association pools, as this may cause loops in the deposit and withdrawal function to hit the gas block limit.
• Users will receive a reward amount on each block based on the amount staked; staking rewards can be calculated and transferred to the user at any time.
• Rewards will not be received unless they are claimed, they are not distributed during regular deposits and withdrawals.
• A fee will be taken and sent to a fee address if tokens are withdrawn before the cooldown time since the the user's most recent deposit has passed.


• The owner is able to set the start/end time and stop reward distribution at any time.
• The owner is able to add and remove association pools at any time.
• The owner is able to update the fee percentage taken for early withdrawal, the cooldown period after staking, and the address that receives fees at any time.
• The owner is able to update the rewards rate at any time.
• The owner is able to update the designated staking token at any time.

• Utilization of SafeMath to prevent overflows.

Audit Findings Summary

• No external threats were identified.
• Ensure trust in the team as they have considerable control within the ecosystem.
• Date: November 16th, 2021.

Audit Results

 ($) = payable function
 # = non-constant function

 + [Lib] Address 
    - [Int] isContract
    - [Int] sendValue #
    - [Int] functionCall #
    - [Int] functionCall #
    - [Int] functionCallWithValue #
    - [Int] functionCallWithValue #
    - [Int] functionStaticCall
    - [Int] functionStaticCall
    - [Int] functionDelegateCall #
    - [Int] functionDelegateCall #
    - [Int] verifyCallResult

 + [Lib] Math 
    - [Int] max
    - [Int] min
    - [Int] average
    - [Int] ceilDiv

 + [Lib] SafeMath 
    - [Int] tryAdd
    - [Int] trySub
    - [Int] tryMul
    - [Int] tryDiv
    - [Int] tryMod
    - [Int] add
    - [Int] sub
    - [Int] mul
    - [Int] div
    - [Int] mod
    - [Int] sub
    - [Int] div
    - [Int] mod

 + [Int] IERC20 
    - [Ext] totalSupply
    - [Ext] balanceOf
    - [Ext] transfer #
    - [Ext] allowance
    - [Ext] approve #
    - [Ext] transferFrom #

 + [Lib] SafeERC20 
    - [Int] safeTransfer #
    - [Int] safeTransferFrom #
    - [Int] safeApprove #
    - [Int] safeIncreaseAllowance #
    - [Int] safeDecreaseAllowance #
    - [Prv] _callOptionalReturn #

 +  CheersLpPool (Auth)
    - [Pub] Constructor #
    - [Pub] lastTimeRewardApplicable
    - [Pub] rewardPerToken
    - [Pub] earned
    - [Pub] stake #
       - modifiers: checkStart,updateReward
    - [Pub] withdraw #
       - modifiers: updateReward
    - [Pub] receiveRewards #
       - modifiers: updateReward
    - [Pub] addAssociationPool #
       - modifiers: onlyOperator
    - [Pub] deleteAssociationPool #
       - modifiers: onlyOperator
    - [Pub] updateMortgageLp #
       - modifiers: onlyOperator
    - [Pub] updateFeeAddress #
       - modifiers: onlyOperator
    - [Pub] updateStartTime #
       - modifiers: onlyOperator
    - [Pub] updateEndTime #
       - modifiers: onlyOperator
    - [Pub] updateMiningOutput #
       - modifiers: onlyOperator
    - [Pub] setWithDrawPunishTime #
       - modifiers: onlyOperator
    - [Pub] setFeeRatio #
       - modifiers: onlyOperator
    - [Pub] getMortgageNum
    - [Pub] isMortgage
    - [Pub] isStart
    - [Pub] getDailyReward
    - [Pub] getUserPunishTime
    - [Pub] remainingTime
    - [Pub] balanceOfByUser

							

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