IDragonswapV2PoolState

These methods compose the pool's state, and can change with any frequency including multiple times per transaction

Functions​

slot0​

  function slot0(
  ) external view returns (uint160 sqrtPriceX96, int24 tick, uint16 observationIndex, uint16 observationCardinality, uint16 observationCardinalityNext, uint8 feeProtocol, bool unlocked)

The 0th storage slot in the pool stores many values, and is exposed as a single method to save gas when accessed externally.

Return Values:​

Name	Type	Description
sqrtPriceX96	uint160	The current price of the pool as a sqrt(token1/token0) Q64.96 value
tick	int24	The current tick of the pool, i.e. according to the last tick transition that was run. This value may not always be equal to SqrtTickMath getTickAtSqrtRatio(sqrtPriceX96) if the price is on a tick boundary.
observationIndex	uint16	The index of the last oracle observation that was written,
observationCardinality	uint16	The current maximum number of observations stored in the pool,
observationCardinalityNext	uint16	The next maximum number of observations, to be updated when the observation.
feeProtocol	uint8	The protocol fee for both tokens of the pool. Encoded as two 4 bit values, where the protocol fee of token1 is shifted 4 bits and the protocol fee of token0is the lower 4 bits.Used as the denominator of a fraction of the swap fee, e.g. 4 means 1/4th of the swap fee.
unlocked	bool	Whether the pool is currently locked to reentrancy

feeGrowthGlobal0X128​

  function feeGrowthGlobal0X128(
  ) external view returns (uint256)

The fee growth as a Q128.128 fees of token0 collected per unit of liquidity for the entire life of the pool

This value can overflow the uint256

feeGrowthGlobal1X128​

  function feeGrowthGlobal1X128(
  ) external view returns (uint256)

The fee growth as a Q128.128 fees of token1 collected per unit of liquidity for the entire life of the pool

This value can overflow the uint256

protocolFees​

  function protocolFees(
  ) external view returns (uint128 token0, uint128 token1)

The amounts of token0 and token1 that are owed to the protocol

Protocol fees will never exceed uint128 max in either token

liquidity​

  function liquidity(
  ) external view returns (uint128)

The currently in range liquidity available to the pool

This value has no relationship to the total liquidity across all ticks

ticks​

  function ticks(
    int24 tick
  ) external view returns (uint128 liquidityGross, int128 liquidityNet, uint256 feeGrowthOutside0X128, uint256 feeGrowthOutside1X128, int56 tickCumulativeOutside, uint160 secondsPerLiquidityOutsideX128, uint32 secondsOutside, bool initialized)

Look up information about a specific tick in the pool

Parameters:​

Name	Type	Description
tick	int24	The tick to look up

Return Values:​

Name	Type	Description
liquidityGross	uint128	the total amount of position liquidity that uses the pool either as tick lower or tick upper,
liquidityNet	int128	how much liquidity changes when the pool price crosses the tick,
feeGrowthOutside0X128	uint256	the fee growth on the other side of the tick from the current tick in token0,
feeGrowthOutside1X128	uint256	the fee growth on the other side of the tick from the current tick in token1, feeGrowthOutsideX128 values can only be used if the tick is initialized, i.e. if liquidityGross is greater than 0. In addition, these values are only relative and are used to compute snapshots.
tickCumulativeOutside	int56
secondsPerLiquidityOutsideX128	uint160
secondsOutside	uint32
initialized	bool

a specific position.

tickBitmap​

  function tickBitmap(
      int16 wordPosition
  ) external view returns (uint256)

Returns 256 packed tick initialized boolean values. See TickBitmap for more information

positions​

  function positions(
    bytes32 key
  ) external view returns (uint128 _liquidity, uint256 feeGrowthInside0LastX128, uint256 feeGrowthInside1LastX128, uint128 tokensOwed0, uint128 tokensOwed1)

Returns the information about a position by the position's key

Parameters:​

Name	Type	Description
key	bytes32	The position's key is a hash of a preimage composed by the owner, tickLower and tickUpper

Return Values:​

Name	Type	Description
_liquidity	bytes32	The amount of liquidity in the position,
feeGrowthInside0LastX128	uint256	fee growth of token0 inside the tick range as of the last mint/burn/poke,
feeGrowthInside1LastX128	uint256	fee growth of token1 inside the tick range as of the last mint/burn/poke,
tokensOwed0	uint128	the computed amount of token0 owed to the position as of the last mint/burn/poke,
tokensOwed1	uint128	the computed amount of token1 owed to the position as of the last mint/burn/poke

observations​

  function observations(
    uint256 index
  ) external view returns (uint32 blockTimestamp, int56 tickCumulative, uint160 secondsPerLiquidityCumulativeX128, bool initialized)

Returns data about a specific observation index

You most likely want to use #observe() instead of this method to get an observation as of some amount of time ago, rather than at a specific index in the array.

Parameters:​

Name	Type	Description
index	uint256	The element of the observations array to fetch

Return Values:​

Name	Type	Description
blockTimestamp	uint256	The timestamp of the observation,
tickCumulative	int56	the tick multiplied by seconds elapsed for the life of the pool as of the observation timestamp,
secondsPerLiquidityCumulativeX128	uint160	the seconds per in range liquidity for the life of the pool as of the observation timestamp
initialized	bool	whether the observation has been initialized and the values are safe to use