深入 Uniswap V4 源码 - PathKey Library

PathKey Library

结构体定义

PathKey

struct PathKey {
    Currency intermediateCurrency;
    uint24 fee;
    int24 tickSpacing;
    IHooks hooks;
    bytes hookData;
}

• intermediateCurrency：中间代币
• fee：手续费
• tickSpacing：池子 tick 间隔
• hooks：Hooks 合约
• hookData：Hooks 数据

方法定义

getPoolAndSwapDirection

根据输入代币和中间代币信息，计算交易池子和交易方向。

/// @notice Get the pool and swap direction for a given PathKey
/// @param params the given PathKey
/// @param currencyIn the input currency
/// @return poolKey the pool key of the swap
/// @return zeroForOne the direction of the swap, true if currency0 is being swapped for currency1
function getPoolAndSwapDirection(PathKey calldata params, Currency currencyIn)
    internal
    pure
    returns (PoolKey memory poolKey, bool zeroForOne)
{
    Currency currencyOut = params.intermediateCurrency;
    (Currency currency0, Currency currency1) =
        currencyIn < currencyOut ? (currencyIn, currencyOut) : (currencyOut, currencyIn);

    zeroForOne = currencyIn == currency0;
    poolKey = PoolKey(currency0, currency1, params.fee, params.tickSpacing, params.hooks);
}

在 PoolKey 中介绍了 PoolKey 结构体，Uniswap v4 通过 currency0、currency1、fee、tickSpacing、hooks 来唯一标识一个池子，其中，currency0 地址小于 currency1 地址。

因此，在 getPoolAndSwapDirection 中确定交易池子时，首先排序 currency0 和 currency1，结合 fee、tickSpacing、hooks，得到 poolKey。

根据 currencyIn 是否等于 currency0，确定交易方向 zeroForOne，因为此时 currency0 即 token0。

• 本文转载自： github.com/adshao/public...