Farm

Git Source

Inherits: FarmStorage, OwnableUpgradeable, ReentrancyGuardUpgradeable, MulticallUpgradeable

Author: Sperax Foundation.

This contract contains the core logic for the Demeter farms.

Functions

constructor

constructor();

withdraw

Function to be called to withdraw deposit.

function withdraw(uint256 _depositId) external virtual;

Parameters

Name	Type	Description
_depositId	uint256	The id of the deposit.

claimRewards

A function to be called by the depositor to claim rewards.

function claimRewards(uint256 _depositId) external;

Parameters

Name	Type	Description
_depositId	uint256	The id of the deposit.

initiateCooldown

Function to be called to initiate cooldown for a staked deposit.

_depositId is corresponding to the user's deposit.

function initiateCooldown(uint256 _depositId) external nonReentrant;

Parameters

Name	Type	Description
_depositId	uint256	The id of the deposit to be locked.

addRewards

Add rewards to the farm.

function addRewards(address _rwdToken, uint256 _amount) external nonReentrant;

Parameters

Name	Type	Description
_rwdToken	address	The reward token's address.
_amount	uint256	The amount of reward tokens to add.

updateCooldownPeriod

Update the cooldown period.

function updateCooldownPeriod(uint256 _newCooldownPeriod) external onlyOwner;

Parameters

Name	Type	Description
_newCooldownPeriod	uint256	The new cooldown period (in days). E.g: 7 means 7 days.

farmPauseSwitch

Pause / UnPause the farm.

function farmPauseSwitch(bool _isPaused) external onlyOwner;

Parameters

Name	Type	Description
_isPaused	bool	Desired state of the farm (true to pause the farm).

closeFarm

A function to explicitly close the farm.

Recovers remaining non accrued rewards.

function closeFarm() external onlyOwner nonReentrant;

recoverERC20

Recover erc20 tokens other than the reward tokens.

function recoverERC20(address _token) external onlyOwner nonReentrant;

Parameters

Name	Type	Description
_token	address	Address of token to be recovered.

recoverRewardFunds

Get the remaining reward balance out of the farm.

Function recovers minOf(_amount, rewardsLeft).

function recoverRewardFunds(address _rwdToken, uint256 _amount) external nonReentrant;

Parameters

Name	Type	Description
_rwdToken	address	The reward token's address.
_amount	uint256	The amount of the reward tokens to be withdrawn.

setRewardRate

Function to update reward params for a fund.

function setRewardRate(address _rwdToken, uint128[] memory _newRewardRates) external;

Parameters

Name	Type	Description
_rwdToken	address	The reward token's address.
_newRewardRates	uint128[]	The new reward rate for the fund (includes the precision).

updateRewardData

Transfer the tokenManagerRole to other user.

Only the existing tokenManager for a reward can call this function.

function updateRewardData(address _rwdToken, address _newTknManager) external;

Parameters

Name	Type	Description
_rwdToken	address	The reward token's address.
_newTknManager	address	Address of the new token manager.

computeRewards

Function to compute the total accrued rewards for a deposit for each subscription.

function computeRewards(address _account, uint256 _depositId)
    external
    view
    virtual
    returns (uint256[][] memory rewards);

Parameters

Name	Type	Description
_account	address	The user's address.
_depositId	uint256	The id of the deposit.

Returns

Name	Type	Description
rewards	uint256[][]	The total accrued rewards for the deposit for each subscription (uint256[][]).

getRewardFunds

Get the reward fund details.

function getRewardFunds() external view returns (RewardFund[] memory);

Returns

Name	Type	Description
<none>	RewardFund[]	The available reward funds' details for all the reward funds.

getRewardData

Get the reward details for specified reward token.

function getRewardData(address _rwdToken) external view returns (RewardData memory);

Parameters

Name	Type	Description
_rwdToken	address	The address of the reward token.

Returns

Name	Type	Description
<none>	RewardData	The available reward details for the specified reward token.

getDepositInfo

Get deposit info for a deposit id.

function getDepositInfo(uint256 _depositId) external view returns (Deposit memory);

Parameters

Name	Type	Description
_depositId	uint256	The id of the deposit.

Returns

Name	Type	Description
<none>	Deposit	The deposit info (Deposit).

getNumSubscriptions

Get number of subscriptions for an account.

function getNumSubscriptions(uint256 _depositId) external view returns (uint256);

Parameters

Name	Type	Description
_depositId	uint256	The deposit id.

Returns

Name	Type	Description
<none>	uint256	The number of subscriptions for the deposit.

getSubscriptionInfo

Get subscription stats for a deposit.

function getSubscriptionInfo(uint256 _depositId, uint256 _subscriptionId) external view returns (Subscription memory);

Parameters

Name	Type	Description
_depositId	uint256	The deposit id.
_subscriptionId	uint256	The subscription's id.

Returns

Name	Type	Description
<none>	Subscription	The subscription info (Subscription).

getRewardRates

Get reward rates for a rewardToken.

function getRewardRates(address _rwdToken) external view returns (uint256[] memory);

Parameters

Name	Type	Description
_rwdToken	address	The reward token's address.

Returns

Name	Type	Description
<none>	uint256[]	The reward rates for the reward token (uint256[]).

getRewardFundInfo

Get farm reward fund info.

function getRewardFundInfo(uint8 _fundId) external view returns (RewardFund memory);

Parameters

Name	Type	Description
_fundId	uint8	The fund's id.

Returns

Name	Type	Description
<none>	RewardFund	The reward fund info (RewardFund).

getRewardTokens

Function to get the reward tokens added in the farm.

function getRewardTokens() external view returns (address[] memory);

Returns

Name	Type	Description
<none>	address[]	The reward tokens added in the farm.

getTokenAmounts

Function to be called by Demeter Rewarder to get tokens and amounts associated with the farm's liquidity.

This function should be overridden to add the respective logic.

function getTokenAmounts() external view virtual returns (address[] memory, uint256[] memory);

Returns

Name	Type	Description
<none>	address[]	Tokens associated with the farm's pool.
<none>	uint256[]	Amounts associated with the farm's liquidity.

updateFarmRewardData

Function to update the FarmRewardData for all funds.

function updateFarmRewardData() public virtual;

claimRewardsTo

Claim rewards and send it to another account.

Only the depositor can call this function.

function claimRewardsTo(address _account, uint256 _depositId) public nonReentrant;

Parameters

Name	Type	Description
_account	address	To receive the rewards.
_depositId	uint256	The id of the deposit.

updateFarmStartTime

Update the farm start time.

Can be updated only before the farm start. New start time should be in future.

function updateFarmStartTime(uint256 _newStartTime) public virtual onlyOwner;

Parameters

Name	Type	Description
_newStartTime	uint256	The new farm start time.

isFarmOpen

Returns if farm is open. Farm is open if it is not closed.

This function can be overridden to add any new/additional logic.

function isFarmOpen() public view virtual returns (bool);

Returns

Name	Type	Description
<none>	bool	bool True if farm is open.

isFarmActive

Returns if farm is active. Farm is active if it is not paused and not closed.

This function can be overridden to add any new/additional logic.

function isFarmActive() public view virtual returns (bool);

Returns

Name	Type	Description
<none>	bool	bool True if farm is active.

getRewardBalance

Get the reward balance for specified reward token.

This function calculates the available reward balance by considering the accrued rewards and the token supply.

function getRewardBalance(address _rwdToken) public view returns (uint256);

Parameters

Name	Type	Description
_rwdToken	address	The address of the reward token.

Returns

Name	Type	Description
<none>	uint256	The available reward balance for the specified reward token.

_recoverERC20

function _recoverERC20(address _token) internal virtual;

_deposit

Common logic for deposit in the demeter farm.

function _deposit(address _account, bool _lockup, uint256 _liquidity) internal returns (uint256);

Parameters

Name	Type	Description
_account	address	Address of the depositor.
_lockup	bool	Lockup option for the deposit.
_liquidity	uint256	Liquidity amount to be added to the pool.

Returns

Name	Type	Description
<none>	uint256	The deposit id.

_initiateCooldown

Common logic for initiating cooldown.

function _initiateCooldown(uint256 _depositId) internal;

Parameters

Name	Type	Description
_depositId	uint256	User's deposit Id.

_withdraw

Common logic for withdraw.

function _withdraw(uint256 _depositId) internal;

Parameters

Name	Type	Description
_depositId	uint256	User's deposit id.

_updateAndClaimFarmRewards

Claim rewards for the user.

NOTE: any function calling this private function should be marked as non-reentrant.

function _updateAndClaimFarmRewards(uint256 _depositId) internal;

Parameters

Name	Type	Description
_depositId	uint256	The id of the deposit.

_updateAndClaimFarmRewardsTo

Claim rewards for the user and send it to another account.

NOTE: any function calling this private function should be marked as non-reentrant.

function _updateAndClaimFarmRewardsTo(uint256 _depositId, address _receiver) internal;

Parameters

Name	Type	Description
_depositId	uint256	The id of the deposit.
_receiver	address	The receiver of the rewards (Could be different from depositor)

_recoverRewardFunds

Get the remaining reward balance out of the farm.

Function recovers minOf(_amount, rewardsLeft).

In case of partial withdraw of funds, the reward rate has to be set manually again.

function _recoverRewardFunds(address _rwdToken, uint256 _amount) internal;

Parameters

Name	Type	Description
_rwdToken	address	The reward token's address.
_amount	uint256	The amount of the reward token to be withdrawn.

_setRewardRate

Function to update reward params for a fund.

function _setRewardRate(address _rwdToken, uint128[] memory _newRewardRates) internal;

Parameters

Name	Type	Description
_rwdToken	address	The reward token's address.
_newRewardRates	uint128[]	The new reward rate for the fund (includes the precision).

_setupFarm

Function to setup the reward funds and initialize the farm global params during construction.

function _setupFarm(
    string calldata _farmId,
    uint256 _farmStartTime,
    uint256 _cooldownPeriod,
    RewardTokenData[] memory _rwdTokenData
) internal initializer;

Parameters

Name	Type	Description
_farmId	string	ID of the farm. E.g: Demeter_Camelot_V2.
_farmStartTime	uint256	- Farm start time.
_cooldownPeriod	uint256	- Cooldown period in days for locked deposits. E.g: 7 means 7 days.
_rwdTokenData	RewardTokenData[]	- Reward data for each reward token.

_addRewardData

Adds new reward token to the farm.

function _addRewardData(address _token, address _tknManager) internal;

Parameters

Name	Type	Description
_token	address	Address of the reward token to be added.
_tknManager	address	Address of the reward token Manager.

_updateLastRewardAccrualTime

Update the last reward accrual time.

function _updateLastRewardAccrualTime() internal virtual;

_getAccRewards

Computes the accrued reward for a given fund id and time interval.

_alreadyAccRewardBal is useful when this function called from computeRewards function. As computeReward is a view function and it doesn't update the accRewardBal in the rewardData.

function _getAccRewards(uint8 _rwdId, uint8 _fundId, uint256 _time, uint256 _alreadyAccRewardBal)
    internal
    view
    returns (uint256);

Parameters

Name	Type	Description
_rwdId	uint8	Id of the reward token.
_fundId	uint8	Id of the reward fund.
_time	uint256	Time interval for the reward computation.
_alreadyAccRewardBal	uint256	Already accrued reward balance.

Returns

Name	Type	Description
<none>	uint256	accRewards Accrued rewards for the given _rwdId, _fundId and _time.

_validateDeposit

Validate the deposit for account.

function _validateDeposit(address _account, uint256 _depositId) internal view;

Parameters

Name	Type	Description
_account	address	Address of the caller to be checked against depositor.
_depositId	uint256	Id of the deposit.

_validateNotRecentDeposit

A function to validate deposit ts to prevent flash loan vulnerabilities

Reverts when deposit made in the same transaction.

function _validateNotRecentDeposit(uint256 _depositTs) internal view;

Parameters

Name	Type	Description
_depositTs	uint256	depositTs of user's deposit. (It represents deposit ts or increaseDeposit ts)

_validateFarmOpen

Validate if farm is open. Revert otherwise.

This function can be overridden to add any new/additional logic.

function _validateFarmOpen() internal view;

_validateFarmActive

Validate if farm is active. Revert otherwise. Farm is active if it is not paused and not closed.

This function can be overridden to add any new/additional logic.

function _validateFarmActive() internal view;

_validateTokenManager

Validate the caller is the token Manager. Revert otherwise.

function _validateTokenManager(address _rwdToken) internal view;

Parameters

Name	Type	Description
_rwdToken	address	Address of reward token.

_validateRewardToken

Validate the reward token is valid.

function _validateRewardToken(address _rwdToken) internal view;

Parameters

Name	Type	Description
_rwdToken	address	Address of reward token.

_getRewardAccrualTimeElapsed

Get the time elapsed since the last reward accrual.

function _getRewardAccrualTimeElapsed() internal view virtual returns (uint256);

Returns

Name	Type	Description
<none>	uint256	time The time elapsed since the last reward accrual.

_validateCooldownPeriod

An internal function to validate cooldown period.

function _validateCooldownPeriod(uint256 _cooldownPeriod) internal pure;

Parameters

Name	Type	Description
_cooldownPeriod	uint256	Period to be validated.

_validateNonZeroAddr

Validate address.

function _validateNonZeroAddr(address _addr) internal pure;

Parameters

Name	Type	Description
_addr	address	Address to be validated.

_subscribeRewardFund

Add subscription to the reward fund for a deposit.

function _subscribeRewardFund(uint8 _fundId, uint256 _depositId, uint256 _liquidity) private;

Parameters

Name	Type	Description
_fundId	uint8	The reward fund id.
_depositId	uint256	The unique ID of the deposit.
_liquidity	uint256	The liquidity of the deposit.

_unsubscribeRewardFund

Unsubscribe a reward fund from a deposit.

The rewards claimed from the reward fund is persisted in the event.

function _unsubscribeRewardFund(uint8 _fundId, uint256 _depositId) private;

Parameters

Name	Type	Description
_fundId	uint8	The reward fund id.
_depositId	uint256	The deposit id corresponding to the user.