69 lines
3.3 KiB
Solidity
69 lines
3.3 KiB
Solidity
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// SPDX-License-Identifier: GPL-3.0-or-later
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pragma solidity ^0.8.19;
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import { IWETH9 } from "../src/interfaces/IWETH9.sol";
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import "@uniswap-v3-core/interfaces/IUniswapV3Pool.sol";
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/**
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* @title SeedSwapper
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* @notice One-shot helper deployed during Deploy*.run() to perform the initial seed buy.
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* Executing a small buy before the protocol opens eliminates the cumulativeVolume==0
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* front-run window: after the seed recenter, VWAP has a real anchor and the bootstrap
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* path in LiquidityManager.recenter() is never reachable by external users.
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*
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* @dev Deployed by both DeployLocal and DeployBase; extracted here to avoid duplicate
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* Foundry artifacts and drift between the two deploy scripts.
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*/
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contract SeedSwapper {
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// TickMath sentinel values — the pool will consume as much input as available in-range.
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uint160 private constant SQRT_PRICE_LIMIT_MIN = 4295128740; // TickMath.MIN_SQRT_RATIO + 1
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uint160 private constant SQRT_PRICE_LIMIT_MAX = // TickMath.MAX_SQRT_RATIO - 1
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1461446703485210103287273052203988822378723970341;
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IWETH9 private immutable weth;
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IUniswapV3Pool private immutable pool;
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bool private immutable token0isWeth;
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constructor(address _weth, address _pool, bool _token0isWeth) {
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weth = IWETH9(_weth);
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pool = IUniswapV3Pool(_pool);
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token0isWeth = _token0isWeth;
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}
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/// @notice Wraps msg.value ETH to WETH, swaps it for KRK (buying KRK), and sweeps any
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/// unconsumed WETH back to `recipient`. The fee generated by the swap is captured
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/// in the LM's anchor position so the subsequent recenter() call will collect a
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/// non-zero ethFee and record VWAP.
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///
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/// @dev If the pool exhausts in-range liquidity before spending all WETH (price-limit
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/// sentinel reached), `wethDelta < msg.value` in the callback and the remainder
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/// stays as WETH in this contract. The post-swap sweep returns it to `recipient`
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/// so no funds are stranded.
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function executeSeedBuy(address recipient) external payable {
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weth.deposit{ value: msg.value }();
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// zeroForOne=true when WETH is token0: sell token0(WETH) -> token1(KRK)
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// zeroForOne=false when WETH is token1: sell token1(WETH) -> token0(KRK)
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bool zeroForOne = token0isWeth;
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uint160 priceLimit = zeroForOne ? SQRT_PRICE_LIMIT_MIN : SQRT_PRICE_LIMIT_MAX;
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pool.swap(recipient, zeroForOne, int256(msg.value), priceLimit, "");
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// Sweep any unconsumed WETH to recipient (occurs when price limit is reached
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// before the full input is spent).
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uint256 leftover = weth.balanceOf(address(this));
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if (leftover > 0) {
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require(weth.transfer(recipient, leftover), "SeedSwapper: WETH sweep failed");
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}
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}
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/// @notice Uniswap V3 callback: pay the WETH owed for the seed buy.
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function uniswapV3SwapCallback(int256 amount0Delta, int256 amount1Delta, bytes calldata) external {
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require(msg.sender == address(pool), "SeedSwapper: only pool");
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int256 wethDelta = token0isWeth ? amount0Delta : amount1Delta;
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if (wethDelta > 0) {
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require(weth.transfer(msg.sender, uint256(wethDelta)), "SeedSwapper: WETH transfer failed");
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}
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}
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}
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