QuoterV2

Allows getting the expected amount out or amount in for a given swap without executing the swap

These functions are not gas efficient and should not be called on chain. Instead, optimistically execute the swap and check the amounts in the callback.

State Variables

amountOutCached

Transient storage variable used to check a safety condition in exact output swaps.

uint256 private amountOutCached;

Functions

constructor

constructor(address _factory, address _WSEI) PeripheryImmutableState(_factory, _WSEI);

getPool

function getPool(address tokenA, address tokenB, uint24 fee) private view returns (IDragonswapV2Pool);

dragonswapV2SwapCallback

Called to msg.sender after executing a swap via IDragonswapV2Pool#swap.

In the implementation you must pay the pool tokens owed for the swap. The caller of this method must be checked to be a DragonswapV2Pool deployed by the canonical DragonswapV2Factory. amount0Delta and amount1Delta can both be 0 if no tokens were swapped.

function dragonswapV2SwapCallback(int256 amount0Delta, int256 amount1Delta, bytes memory path) external view override;

Parameters

Name	Type	Description
amount0Delta	int256	The amount of token0 that was sent (negative) or must be received (positive) by the pool by the end of the swap. If positive, the callback must send that amount of token0 to the pool.
amount1Delta	int256	The amount of token1 that was sent (negative) or must be received (positive) by the pool by the end of the swap. If positive, the callback must send that amount of token1 to the pool.
path	bytes

parseRevertReason

Parses a revert reason that should contain the numeric quote

function parseRevertReason(bytes memory reason)
    private
    pure
    returns (uint256 amount, uint160 sqrtPriceX96After, int24 tickAfter);

handleRevert

function handleRevert(bytes memory reason, IDragonswapV2Pool pool, uint256 gasEstimate)
    private
    view
    returns (uint256 amount, uint160 sqrtPriceX96After, uint32 initializedTicksCrossed, uint256);

quoteExactInputSingle

function quoteExactInputSingle(QuoteExactInputSingleParams memory params)
    public
    override
    returns (uint256 amountOut, uint160 sqrtPriceX96After, uint32 initializedTicksCrossed, uint256 gasEstimate);

quoteExactInput

function quoteExactInput(bytes memory path, uint256 amountIn)
    public
    override
    returns (
        uint256 amountOut,
        uint160[] memory sqrtPriceX96AfterList,
        uint32[] memory initializedTicksCrossedList,
        uint256 gasEstimate
    );

quoteExactOutputSingle

function quoteExactOutputSingle(QuoteExactOutputSingleParams memory params)
    public
    override
    returns (uint256 amountIn, uint160 sqrtPriceX96After, uint32 initializedTicksCrossed, uint256 gasEstimate);

quoteExactOutput

function quoteExactOutput(bytes memory path, uint256 amountOut)
    public
    override
    returns (
        uint256 amountIn,
        uint160[] memory sqrtPriceX96AfterList,
        uint32[] memory initializedTicksCrossedList,
        uint256 gasEstimate
    );