DataStorageOperator

Algebra timepoints data operator

This contract stores timepoints and calculates adaptive fee and statistical averages

Modifiers

onlyPool

modifier onlyPool() internal

Variables

struct DataStorage.Timepoint[65536] timepoints

Returns data belonging to a certain timepoint

Developer note: There is more convenient function to fetch a timepoint: getTimepoints(). Which requires not an index but seconds

struct AlgebraFeeConfiguration feeConfig

bytes32 FEE_CONFIG_MANAGER constant

Developer note: The role can be granted in AlgebraFactory

Functions

constructor

constructor(address _pool) public public

Name	Type	Description
_pool	address

initialize

function initialize(uint32 time, int24 tick) external external

Initialize the dataStorage array by writing the first slot. Called once for the lifecycle of the timepoints array

Name	Type	Description
time	uint32	The time of the dataStorage initialization, via block.timestamp truncated to uint32
tick	int24	Initial tick

changeFeeConfiguration

function changeFeeConfiguration(struct AlgebraFeeConfiguration _config) external external

Changes fee configuration for the pool

Name	Type	Description
_config	struct AlgebraFeeConfiguration

getSingleTimepoint

function getSingleTimepoint(uint32 time, uint32 secondsAgo, int24 tick, uint16 lastIndex) external view returns (int56 tickCumulative, uint112 volatilityCumulative) view external

Developer note: Reverts if a timepoint at or before the desired timepoint timestamp does not exist. 0 may be passed as `secondsAgo' to return the current cumulative values. If called with a timestamp falling between two timepoints, returns the counterfactual accumulator values at exactly the timestamp between the two timepoints.

Name	Type	Description
time	uint32	The current block timestamp
secondsAgo	uint32	The amount of time to look back, in seconds, at which point to return a timepoint
tick	int24	The current tick
lastIndex	uint16

Returns:

Name	Type	Description
tickCumulative	int56	The cumulative tick since the pool was first initialized, as of `secondsAgo`
volatilityCumulative	uint112	The cumulative volatility value since the pool was first initialized, as of `secondsAgo`

getTimepoints

function getTimepoints(uint32[] secondsAgos) external view returns (int56[] tickCumulatives, uint112[] volatilityCumulatives) view external

Returns the accumulator values as of each time seconds ago from the given time in the array of `secondsAgos` Developer note: Reverts if `secondsAgos` > oldest timepoint

Name	Type	Description
secondsAgos	uint32[]	Each amount of time to look back, in seconds, at which point to return a timepoint

Returns:

Name	Type	Description
tickCumulatives	int56[]	The cumulative tick since the pool was first initialized, as of each `secondsAgo`
volatilityCumulatives	uint112[]	The cumulative volatility values since the pool was first initialized, as of each `secondsAgo`

write

function write(uint16 index, uint32 blockTimestamp, int24 tick) external returns (uint16 indexUpdated, uint16 newFee) external

Writes a dataStorage timepoint to the array Developer note: Writable at most once per block. Index represents the most recently written element. index must be tracked externally.

Name	Type	Description
index	uint16	The index of the timepoint that was most recently written to the timepoints array
blockTimestamp	uint32	The timestamp of the new timepoint
tick	int24	The active tick at the time of the new timepoint

Returns:

Name	Type	Description
indexUpdated	uint16	The new index of the most recently written element in the dataStorage array
newFee	uint16	The fee in hundredths of a bip, i.e. 1e-6

prepayTimepointsStorageSlots

function prepayTimepointsStorageSlots(uint16 startIndex, uint16 amount) external external

Fills uninitialized timepoints with nonzero value Developer note: Can be used to reduce the gas cost of future swaps

Name	Type	Description
startIndex	uint16	The start index, must be not initialized
amount	uint16	of slots to fill, startIndex + amount must be <= type(uint16).max