IDataStorageOperator
The interface for the DataStorageOperator
Developer note: This contract stores timepoints and calculates adaptive fee and statistical averages
Events
FeeConfiguration
event FeeConfiguration(struct AlgebraFeeConfiguration feeConfig)
Emitted when the fee configuration is changed Developer note: See the AdaptiveFee library for more details
| Name | Type | Description |
|---|---|---|
feeConfig | struct AlgebraFeeConfiguration | The structure with dynamic fee parameters |
Functions
timepoints
function timepoints(uint256 index) external view returns (bool initialized, uint32 blockTimestamp, int56 tickCumulative, uint88 volatilityCumulative, int24 tick, int24 averageTick, uint16 windowStartIndex) view external
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
| Name | Type | Description |
|---|---|---|
index | uint256 | The index of timepoint in the array |
Returns:
| Name | Type | Description |
|---|---|---|
initialized | bool | Whether the timepoint has been initialized and the values are safe to use |
blockTimestamp | uint32 | The timestamp of the timepoint |
tickCumulative | int56 | The tick multiplied by seconds elapsed for the life of the pool as of the timepoint timestamp |
volatilityCumulative | uint88 | Cumulative standard deviation for the life of the pool as of the timepoint timestamp |
tick | int24 | The tick at blockTimestamp |
averageTick | int24 | Time-weighted average tick |
windowStartIndex | uint16 | Index of closest timepoint >= WINDOW seconds ago |
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 |
getSingleTimepoint
function getSingleTimepoint(uint32 time, uint32 secondsAgo, int24 tick, uint16 index) 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 |
index | uint16 | The index of the timepoint that was most recently written to the timepoints array |
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 |
changeFeeConfiguration
function changeFeeConfiguration(struct AlgebraFeeConfiguration feeConfig) external external
Changes fee configuration for the pool
| Name | Type | Description |
|---|---|---|
feeConfig | struct AlgebraFeeConfiguration |
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 |