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BNBPartyFee.sol
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BNBPartyFee.sol
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./BNBPartyModifiers.sol";
import "./interfaces/IUniswapV3Pool.sol";
/// @title BNBPartyFee
/// @notice This abstract contract provides internal functions for calculating fees in the BNB Party system.
abstract contract BNBPartyFee is BNBPartyModifiers {
/// @notice Internal function to retrieve the fee growth inside the position from the last observation
/// @param pool Address of the Uniswap V3 pool
/// @return feeGrowthInside0LastX128 Fee growth inside for token0 from the last observation
/// @return feeGrowthInside1LastX128 Fee growth inside for token1 from the last observation
function _getFeeGrowthInsideLastX128(
IUniswapV3Pool pool
)
internal
view
returns (
uint256 feeGrowthInside0LastX128,
uint256 feeGrowthInside1LastX128
)
{
(
feeGrowthInside0LastX128,
feeGrowthInside1LastX128
) = _getFeeGrowthInsideLastX128(
pool,
keccak256(
abi.encodePacked(
address(positionManager),
party.lpTicks.tickLower,
party.lpTicks.tickUpper
)
)
);
}
/// @notice Internal function to retrieve the fee growth inside the position from the last observation
/// @param pool Address of the Uniswap V3 pool
function _getPartyFeeGrowthInsideLastX128(
IUniswapV3Pool pool
)
internal
view
returns (
uint256 feeGrowthInside0LastX128,
uint256 feeGrowthInside1LastX128
)
{
(
feeGrowthInside0LastX128,
feeGrowthInside1LastX128
) = _getFeeGrowthInsideLastX128(
pool,
keccak256(
abi.encodePacked(
address(BNBPositionManager),
party.partyTicks.tickLower,
party.partyTicks.tickUpper
)
)
);
}
/// @notice Internal function to retrieve the fee growth inside the position from the last observation
/// @param pool Address of the Uniswap V3 pool
function _getFeeGrowthInsideLastX128(
IUniswapV3Pool pool,
bytes32 key
)
internal
view
returns (
uint256 feeGrowthInside0LastX128,
uint256 feeGrowthInside1LastX128
)
{
(, feeGrowthInside0LastX128, feeGrowthInside1LastX128, , ) = pool.positions(key);
}
/// @notice Internal function to calculate the global fee growth
/// @param pool Address of the Uniswap V3 pool
function _calculateFeeGrowthGlobal(IUniswapV3Pool pool) internal view returns (uint256 feeGrowthGlobal) {
if (pool.token0() == address(WBNB)) {
(uint256 feeGrowthInside0LastX128,) = _getPartyFeeGrowthInsideLastX128(pool);
feeGrowthGlobal = pool.feeGrowthGlobal0X128() - feeGrowthInside0LastX128;
} else {
(,uint256 feeGrowthInside1LastX128) = _getPartyFeeGrowthInsideLastX128(pool);
feeGrowthGlobal = pool.feeGrowthGlobal1X128() - feeGrowthInside1LastX128;
}
}
}