DragonswapV2Staker

Below is the technical reference for the staker contract, DragonswapV2Staker.sol. A technical guide for interacting with this staking contract will be released soon.

Functions​

stakes​

  function stakes(
    uint256 tokenId,
    bytes32 incentiveId
  ) public view override returns (uint160 secondsPerLiquidityInsideInitialX128, uint128 liquidity)

Returns information about a staked liquidity NFT

Parameters:​

Name	Type	Description
tokenId	uint256	The ID of the staked token
incentiveId	bytes32	The ID of the incentive for which the token is staked

Return Values:​

Name	Type	Description
secondsPerLiquidityInsideInitialX128	uint160	secondsPerLiquidity represented as a UQ32.128
liquidity	bytes32	The amount of liquidity in the NFT as of the last time the rewards were computed

constructor​

  function constructor(
    contract IDragonswapV2Factory _factory,
    contract INonfungiblePositionManager _nonfungiblePositionManager,
    uint256 _maxIncentiveStartLeadTime,
    uint256 _maxIncentiveDuration
  ) public

Parameters:​

Name	Type	Description
_factory	contract IDragonswapV2Factory	the DragonswapV2 factory
_nonfungiblePositionManager	contract INonfungiblePositionManager	the NFT position manager contract address
_maxIncentiveStartLeadTime	uint256	the max duration of an incentive in seconds
_maxIncentiveDuration	uint256	the max amount of seconds into the future the incentive startTime can be set

createIncentive​

  function createIncentive(
    struct IDragonswapV2Staker.IncentiveKey key,
    uint256 reward
  ) external

Creates a new liquidity mining incentive program

Parameters:​

Name	Type	Description
key	struct IDragonswapV2Staker.IncentiveKey	Details of the incentive to create
reward	uint256	The amount of reward tokens to be distributed

endIncentive​

  function endIncentive(
    struct IDragonswapV2Staker.IncentiveKey key
  ) external returns (uint256 refund)

Ends an incentive after the incentive end time has passed and all stakes have been withdrawn

Parameters:​

Name	Type	Description
key	struct IDragonswapV2Staker.IncentiveKey	Details of the incentive to end

Return Values:​

Name	Type	Description
refund	uint256	The remaining reward tokens when the incentive is ended

onERC721Received​

  function onERC721Received(
  ) external returns (bytes4)

Upon receiving a DragonswapV2 ERC721, creates the token deposit setting owner to from. Also stakes token in one or more incentives if properly formatted data has a length > 0.

Whenever an {IERC721} tokenId token is transferred to this contract via {IERC721-safeTransferFrom} by operator from from, this function is called. It must return its Solidity selector to confirm the token transfer. If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted. The selector can be obtained in Solidity with IERC721.onERC721Received.selector.

transferDeposit​

  function transferDeposit(
    uint256 tokenId,
    address to
  ) external

Transfers ownership of a deposit from the sender to the given recipient

Parameters:​

Name	Type	Description
tokenId	uint256	The ID of the token (and the deposit) to transfer
to	address	The new owner of the deposit

withdrawToken​

  function withdrawToken(
    uint256 tokenId,
    address to,
    bytes data
  ) external

Withdraws a DragonswapV2 LP token tokenId from this contract to the recipient to

Parameters:​

Name	Type	Description
tokenId	uint256	The unique identifier of an DragonswapV2 LP token
to	address	The address where the LP token will be sent
data	bytes	An optional data array that will be passed along to the to address via the NFT safeTransferFrom

stakeToken​

  function stakeToken(
    struct IDragonswapV2Staker.IncentiveKey key,
    uint256 tokenId
  ) external

Stakes a DragonswapV2 LP token

Parameters:​

Name	Type	Description
key	struct IDragonswapV2Staker.IncentiveKey	The key of the incentive for which to stake the NFT
tokenId	uint256	The ID of the token to stake

unstakeToken​

  function unstakeToken(
    struct IDragonswapV2Staker.IncentiveKey key,
    uint256 tokenId
  ) external

Unstakes a DragonswapV2 LP token

Parameters:​

Name	Type	Description
key	struct IDragonswapV2Staker.IncentiveKey	The key of the incentive for which to unstake the NFT
tokenId	uint256	The ID of the token to unstake

claimReward​

  function claimReward(
    contract IERC20Minimal rewardToken,
    address to,
    uint256 amountRequested
  ) external override returns (uint256 reward)

Transfers amountRequested of accrued rewardToken rewards from the contract to the recipient to

Parameters:​

Name	Type	Description
rewardToken	contract IERC20Minimal	The token being distributed as a reward
to	address	The address where claimed rewards will be sent to
amountRequested	uint256	The amount of reward tokens to claim. Claims entire reward amount if set to 0.

Return Values:​

Name	Type	Description
reward	uint256	The amount of reward tokens claimed

getRewardInfo​

  function getRewardInfo(
    struct IDragonswapV2Staker.IncentiveKey key,
    uint256 tokenId
  ) external view override returns (uint256 reward, uint160 secondsInsideX128)

Calculates the reward amount that will be received for the given stake

Parameters:​

Name	Type	Description
key	struct IDragonswapV2Staker.IncentiveKey	The key of the incentive
tokenId	uint256	The ID of the token

Return Values:​

Name	Type	Description
reward	uint256	The reward accrued to the NFT for the given incentive thus far
secondsInsideX128	uint160	The seconds inside the tick range