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src/plugin/contracts/AlgebraBasePluginV2.sol

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+// SPDX-License-Identifier: BUSL-1.1
+pragma solidity =0.8.20;
+
+import '@cryptoalgebra/integral-core/contracts/libraries/Plugins.sol';
+import '@cryptoalgebra/integral-core/contracts/libraries/TickMath.sol';
+
+import '@cryptoalgebra/integral-core/contracts/interfaces/IAlgebraFactory.sol';
+import '@cryptoalgebra/integral-core/contracts/interfaces/plugin/IAlgebraPlugin.sol';
+import '@cryptoalgebra/integral-core/contracts/interfaces/pool/IAlgebraPoolState.sol';
+import '@cryptoalgebra/integral-core/contracts/interfaces/IAlgebraPool.sol';
+
+
+import './base/SlidingFeeModule.sol'; 
+
+import './interfaces/IAlgebraBasePluginV1.sol';
+import './interfaces/IBasePluginV1Factory.sol';
+import './interfaces/IAlgebraVirtualPool.sol';
+
+import './libraries/VolatilityOracle.sol';
+import './libraries/AdaptiveFee.sol';
+import './types/AlgebraFeeConfigurationU144.sol';
+
+/// @title Algebra Integral 1.1 default plugin
+/// @notice This contract stores timepoints and calculates adaptive fee and statistical averages
+contract AlgebraBasePluginV2 is SlidingFeeModule, IAlgebraBasePluginV1, IAlgebraPlugin {
+  using Plugins for uint8;
+  using AlgebraFeeConfigurationU144Lib for AlgebraFeeConfiguration;
+
+  uint256 internal constant UINT16_MODULO = 65536;
+  using VolatilityOracle for VolatilityOracle.Timepoint[UINT16_MODULO];
+
+  /// @dev The role can be granted in AlgebraFactory
+  bytes32 public constant ALGEBRA_BASE_PLUGIN_MANAGER = keccak256('ALGEBRA_BASE_PLUGIN_MANAGER');
+
+  /// @inheritdoc IAlgebraPlugin
+  uint8 public constant override defaultPluginConfig = uint8(Plugins.AFTER_INIT_FLAG | Plugins.BEFORE_SWAP_FLAG | Plugins.DYNAMIC_FEE);
+
+  /// @inheritdoc IFarmingPlugin
+  address public immutable override pool;
+  address private immutable factory;
+  address private immutable pluginFactory;
+
+  /// @inheritdoc IVolatilityOracle
+  VolatilityOracle.Timepoint[UINT16_MODULO] public override timepoints;
+
+  /// @inheritdoc IVolatilityOracle
+  uint16 public override timepointIndex;
+
+  /// @inheritdoc IVolatilityOracle
+  uint32 public override lastTimepointTimestamp;
+
+  /// @inheritdoc IVolatilityOracle
+  bool public override isInitialized;
+
+  /// @dev AlgebraFeeConfiguration struct packed in uint144
+  AlgebraFeeConfigurationU144 private _feeConfig;
+
+  /// @inheritdoc IFarmingPlugin
+  address public override incentive;
+
+  /// @dev the address which connected the last incentive. Needed so that he can disconnect it
+  address private _lastIncentiveOwner;
+
+  modifier onlyPool() {
+    _checkIfFromPool();
+    _;
+  }
+
+  constructor(address _pool, address _factory, address _pluginFactory) SlidingFeeModule() {
+    (factory, pool, pluginFactory) = (_factory, _pool, _pluginFactory);
+  }
+
+  /// @inheritdoc IDynamicFeeManager
+  function feeConfig()
+    external
+    view
+    override
+    returns (uint16 alpha1, uint16 alpha2, uint32 beta1, uint32 beta2, uint16 gamma1, uint16 gamma2, uint16 baseFee)
+  {
+    (alpha1, alpha2) = (_feeConfig.alpha1(), _feeConfig.alpha2());
+    (beta1, beta2) = (_feeConfig.beta1(), _feeConfig.beta2());
+    (gamma1, gamma2) = (_feeConfig.gamma1(), _feeConfig.gamma2());
+    baseFee = _feeConfig.baseFee();
+  }
+
+  function _checkIfFromPool() internal view {
+    require(msg.sender == pool, 'Only pool can call this');
+  }
+
+  function _getPoolState() internal view returns (uint160 price, int24 tick, uint16 fee, uint8 pluginConfig) {
+    (price, tick, fee, pluginConfig, , ) = IAlgebraPoolState(pool).globalState();
+  }
+
+  function _getPluginInPool() internal view returns (address plugin) {
+    return IAlgebraPool(pool).plugin();
+  }
+
+  /// @inheritdoc IAlgebraBasePluginV1
+  function initialize() external override {
+    require(!isInitialized, 'Already initialized');
+    require(_getPluginInPool() == address(this), 'Plugin not attached');
+    (uint160 price, int24 tick, , ) = _getPoolState();
+    require(price != 0, 'Pool is not initialized');
+
+    uint32 time = _blockTimestamp();
+    timepoints.initialize(time, tick);
+    lastTimepointTimestamp = time;
+    isInitialized = true;
+
+    _updatePluginConfigInPool();
+  }
+
+  // ###### Volatility and TWAP oracle ######
+
+  /// @inheritdoc IVolatilityOracle
+  function getSingleTimepoint(uint32 secondsAgo) external view override returns (int56 tickCumulative, uint88 volatilityCumulative) {
+    // `volatilityCumulative` values for timestamps after the last timepoint _should not_ be compared: they may differ due to interpolation errors
+    (, int24 tick, , ) = _getPoolState();
+    uint16 lastTimepointIndex = timepointIndex;
+    uint16 oldestIndex = timepoints.getOldestIndex(lastTimepointIndex);
+    VolatilityOracle.Timepoint memory result = timepoints.getSingleTimepoint(_blockTimestamp(), secondsAgo, tick, lastTimepointIndex, oldestIndex);
+    (tickCumulative, volatilityCumulative) = (result.tickCumulative, result.volatilityCumulative);
+  }
+
+  /// @inheritdoc IVolatilityOracle
+  function getTimepoints(
+    uint32[] memory secondsAgos
+  ) external view override returns (int56[] memory tickCumulatives, uint88[] memory volatilityCumulatives) {
+    // `volatilityCumulative` values for timestamps after the last timepoint _should not_ be compared: they may differ due to interpolation errors
+    (, int24 tick, , ) = _getPoolState();
+    return timepoints.getTimepoints(_blockTimestamp(), secondsAgos, tick, timepointIndex);
+  }
+
+  /// @inheritdoc IVolatilityOracle
+  function prepayTimepointsStorageSlots(uint16 startIndex, uint16 amount) external override {
+    require(!timepoints[startIndex].initialized); // if not initialized, then all subsequent ones too
+    require(amount > 0 && type(uint16).max - startIndex >= amount);
+
+    unchecked {
+      for (uint256 i = startIndex; i < startIndex + amount; ++i) {
+        timepoints[i].blockTimestamp = 1; // will be overwritten
+      }
+    }
+  }
+
+  // ###### Fee manager ######
+
+  /// @inheritdoc IDynamicFeeManager
+  function changeFeeConfiguration(AlgebraFeeConfiguration calldata _config) external override {
+    require(msg.sender == pluginFactory || IAlgebraFactory(factory).hasRoleOrOwner(ALGEBRA_BASE_PLUGIN_MANAGER, msg.sender));
+    AdaptiveFee.validateFeeConfiguration(_config);
+
+    _feeConfig = _config.pack(); // pack struct to uint144 and write in storage
+    emit FeeConfiguration(_config);
+  }
+
+  function setPriceChangeFactor(uint256 _priceChangeFactor) external {
+      require(msg.sender == pluginFactory || IAlgebraFactory(factory).hasRoleOrOwner(ALGEBRA_BASE_PLUGIN_MANAGER, msg.sender));
+      s_priceChangeFactor = _priceChangeFactor;
+
+      emit PriceChangeFactor(_priceChangeFactor);
+  }
+
+  /// @inheritdoc IAlgebraDynamicFeePlugin
+  function getCurrentFee() external view override returns (uint16 fee) {
+    (, , fee, ) = _getPoolState();
+  }
+
+  function _getFeeAtLastTimepoint(
+    uint160 currentPrice,
+    uint16 lastTimepoinIntex,
+    uint16 currentPoolFee,
+    bool zeroToOne
+  ) internal returns (uint16 fee) {
+    VolatilityOracle.Timepoint memory lastTimepoint = timepoints[lastTimepoinIntex];
+
+    return _getFeeAndUpdateFactors(currentPrice, TickMath.getSqrtRatioAtTick(lastTimepoint.tick), currentPoolFee, zeroToOne);
+  }
+
+  // ###### Farming plugin ######
+
+  /// @inheritdoc IFarmingPlugin
+  function setIncentive(address newIncentive) external override {
+    bool toConnect = newIncentive != address(0);
+    bool accessAllowed;
+    if (toConnect) {
+      accessAllowed = msg.sender == IBasePluginV1Factory(pluginFactory).farmingAddress();
+    } else {
+      // we allow the one who connected the incentive to disconnect it,
+      // even if he no longer has the rights to connect incentives
+      if (_lastIncentiveOwner != address(0)) accessAllowed = msg.sender == _lastIncentiveOwner;
+      if (!accessAllowed) accessAllowed = msg.sender == IBasePluginV1Factory(pluginFactory).farmingAddress();
+    }
+    require(accessAllowed, 'Not allowed to set incentive');
+
+    bool isPluginConnected = _getPluginInPool() == address(this);
+    if (toConnect) require(isPluginConnected, 'Plugin not attached');
+
+    address currentIncentive = incentive;
+    require(currentIncentive != newIncentive, 'Already active');
+    if (toConnect) require(currentIncentive == address(0), 'Has active incentive');
+
+    incentive = newIncentive;
+    emit Incentive(newIncentive);
+
+    if (toConnect) {
+      _lastIncentiveOwner = msg.sender; // write creator of this incentive
+    } else {
+      _lastIncentiveOwner = address(0);
+    }
+
+    if (isPluginConnected) {
+      _updatePluginConfigInPool();
+    }
+  }
+
+  /// @inheritdoc IFarmingPlugin
+  function isIncentiveConnected(address targetIncentive) external view override returns (bool) {
+    if (incentive != targetIncentive) return false;
+    if (_getPluginInPool() != address(this)) return false;
+    (, , , uint8 pluginConfig) = _getPoolState();
+    if (!pluginConfig.hasFlag(Plugins.AFTER_SWAP_FLAG)) return false;
+
+    return true;
+  }
+
+  // ###### HOOKS ######
+
+  function beforeInitialize(address, uint160) external override onlyPool returns (bytes4) {
+    _updatePluginConfigInPool();
+    return IAlgebraPlugin.beforeInitialize.selector;
+  }
+
+  function afterInitialize(address, uint160, int24 tick) external override onlyPool returns (bytes4) {
+    uint32 _timestamp = _blockTimestamp();
+    timepoints.initialize(_timestamp, tick);
+
+    lastTimepointTimestamp = _timestamp;
+    isInitialized = true;
+
+    IAlgebraPool(pool).setFee(_feeConfig.baseFee());
+    return IAlgebraPlugin.afterInitialize.selector;
+  }
+
+  /// @dev unused
+  function beforeModifyPosition(address, address, int24, int24, int128, bytes calldata) external override onlyPool returns (bytes4) {
+    _updatePluginConfigInPool(); // should not be called, reset config
+    return IAlgebraPlugin.beforeModifyPosition.selector;
+  }
+
+  /// @dev unused
+  function afterModifyPosition(address, address, int24, int24, int128, uint256, uint256, bytes calldata) external override onlyPool returns (bytes4) {
+    _updatePluginConfigInPool(); // should not be called, reset config
+    return IAlgebraPlugin.afterModifyPosition.selector;
+  }
+
+  function beforeSwap(address, address, bool zeroToOne, int256, uint160, bool, bytes calldata) external override onlyPool returns (bytes4) {
+    _writeTimepointAndUpdateFee(zeroToOne);
+    return IAlgebraPlugin.beforeSwap.selector;
+  }
+
+  function afterSwap(address, address, bool zeroToOne, int256, uint160, int256, int256, bytes calldata) external override onlyPool returns (bytes4) {
+    address _incentive = incentive;
+    if (_incentive != address(0)) {
+      (, int24 tick, , ) = _getPoolState();
+      IAlgebraVirtualPool(_incentive).crossTo(tick, zeroToOne);
+    } else {
+      _updatePluginConfigInPool(); // should not be called, reset config
+    }
+
+    return IAlgebraPlugin.afterSwap.selector;
+  }
+
+  /// @dev unused
+  function beforeFlash(address, address, uint256, uint256, bytes calldata) external override onlyPool returns (bytes4) {
+    _updatePluginConfigInPool(); // should not be called, reset config
+    return IAlgebraPlugin.beforeFlash.selector;
+  }
+
+  /// @dev unused
+  function afterFlash(address, address, uint256, uint256, uint256, uint256, bytes calldata) external override onlyPool returns (bytes4) {
+    _updatePluginConfigInPool(); // should not be called, reset config
+    return IAlgebraPlugin.afterFlash.selector;
+  }
+
+  function _updatePluginConfigInPool() internal {
+    uint8 newPluginConfig = defaultPluginConfig;
+    if (incentive != address(0)) {
+      newPluginConfig |= uint8(Plugins.AFTER_SWAP_FLAG);
+    }
+
+    (, , , uint8 currentPluginConfig) = _getPoolState();
+    if (currentPluginConfig != newPluginConfig) {
+      IAlgebraPool(pool).setPluginConfig(newPluginConfig);
+    }
+  }
+
+  function _writeTimepointAndUpdateFee(bool zeroToOne) internal {
+    // single SLOAD
+    uint16 _lastIndex = timepointIndex;
+    uint32 _lastTimepointTimestamp = lastTimepointTimestamp;
+    AlgebraFeeConfigurationU144 feeConfig_ = _feeConfig; // struct packed in uint144
+    bool _isInitialized = isInitialized;
+    require(_isInitialized, 'Not initialized');
+
+    uint32 currentTimestamp = _blockTimestamp();
+
+    if (_lastTimepointTimestamp == currentTimestamp) return;
+
+    (uint160 currentPrice, int24 tick, uint16 fee, ) = _getPoolState();
+    (uint16 newLastIndex, uint16 newOldestIndex) = timepoints.write(_lastIndex, currentTimestamp, tick);
+
+    timepointIndex = newLastIndex;
+    lastTimepointTimestamp = currentTimestamp;
+
+    uint16 newFee = _getFeeAtLastTimepoint(currentPrice, newLastIndex, fee, zeroToOne);
+    if (newFee != fee) {
+      IAlgebraPool(pool).setFee(newFee);
+    }
+  }
+}