V4TypeGeneric

Git Source

Inherits: ERC20Selectors, Masks

Title: Uniswap V4 type swapper contract

Can only be executed within manager.unlock() Ergo, if Uniswap v4 is in the path (no matter how many times), one has to push the swap data and execution into the UniswapV4.unlock This should be usable together with flash loans from their singleton Cannot unlock multiple times! The execution of a swap follows the steps: 1) pm.unlock(...) (outside of this contract) 2) call pm.swap(...) 3) getDeltas via pm.exttload(bytes[]) (we get it for input/output at once) we get [inputDelta, outputDelta] (pay amount, receive amount) As for the V4 docs, swap does not necessarily return the correct deltas when using hooks, that is why we remain with fetching the deltas 4) call pm.take to pull the outputDelta from pm 4) if input nonnative call pm.sync() and send inputDelta to pm 5) call pm.settle to settle the swap (if native with input value) Technically it is possible to call multihops within V4 where one would skip the take when the next swap is also for V4 This is a bit annoying to implement and for this first version we skip it

State Variables

SWAP

We need all these selectors for executing a single swap

bytes32 private constant SWAP = 0xf3cd914c00000000000000000000000000000000000000000000000000000000

TAKE

bytes32 private constant TAKE = 0x0b0d9c0900000000000000000000000000000000000000000000000000000000

SETTLE

bytes32 private constant SETTLE = 0x11da60b400000000000000000000000000000000000000000000000000000000

SYNC

bytes32 private constant SYNC = 0xa584119400000000000000000000000000000000000000000000000000000000

EXTTLOAD

bytes32 private constant EXTTLOAD = 0x9bf6645f00000000000000000000000000000000000000000000000000000000

Functions

constructor

constructor() ;

_swapUniswapV4ExactInGeneric

Swaps exact input on Uniswap V4 pools

Can only be executed within manager.unlock(). Cannot unlock multiple times.

Note: calldata-offset-table:

function _swapUniswapV4ExactInGeneric(
    uint256 fromAmount,
    address tokenIn,
    address tokenOut,
    address receiver,
    uint256 currentOffset,
    address callerAddress
)
    internal
    returns (
        // this var changes from zeroToOne to the received amount
        uint256 receivedAmount,
        // similar to other implementations, we use this temp variable
        // to avoid stackToo deep
        uint256 tempVar
    );

Parameters

Returns