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Swap: use Uniswap v3 pools #251
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| // SPDX-License-Identifier: MIT | ||
| pragma solidity 0.8.26; | ||
|
|
||
| import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; | ||
| import "@uniswap/v3-periphery/contracts/interfaces/ISwapRouter.sol"; | ||
|
|
||
| library SwapLibrary { | ||
| uint24 constant POOL_FEE = 3000; // 0.3% fee tier | ||
|
|
||
| /** | ||
| * @notice Swap exact tokens for tokens using Uniswap V3 | ||
| */ | ||
| function swapExactTokensForTokens( | ||
| address inputToken, | ||
| uint256 amountIn, | ||
| address outputToken, | ||
| address uniswapRouter, | ||
| address wzeta | ||
| ) internal returns (uint256) { | ||
| // Approve router to spend input tokens | ||
| IERC20(inputToken).approve(uniswapRouter, amountIn); | ||
|
|
||
| // Try direct swap first | ||
| try | ||
| ISwapRouter(uniswapRouter).exactInputSingle( | ||
| ISwapRouter.ExactInputSingleParams({ | ||
| tokenIn: inputToken, | ||
| tokenOut: outputToken, | ||
| fee: POOL_FEE, | ||
| recipient: address(this), | ||
| deadline: block.timestamp + 15 minutes, | ||
| amountIn: amountIn, | ||
| amountOutMinimum: 0, // Let Uniswap handle slippage | ||
| sqrtPriceLimitX96: 0 | ||
| }) | ||
| ) | ||
| returns (uint256 amountOut) { | ||
| return amountOut; | ||
| } catch { | ||
| // If direct swap fails, try through WZETA using exactInput for multi-hop | ||
| // The path is encoded as (tokenIn, fee, WZETA, fee, tokenOut) | ||
| bytes memory path = abi.encodePacked( | ||
| inputToken, | ||
| POOL_FEE, | ||
| wzeta, | ||
| POOL_FEE, | ||
| outputToken | ||
| ); | ||
|
|
||
| ISwapRouter.ExactInputParams memory params = ISwapRouter | ||
| .ExactInputParams({ | ||
| path: path, | ||
| recipient: address(this), | ||
| deadline: block.timestamp + 15 minutes, | ||
| amountIn: amountIn, | ||
| amountOutMinimum: 0 // Let Uniswap handle slippage | ||
| }); | ||
|
|
||
| return ISwapRouter(uniswapRouter).exactInput(params); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * @notice Swap tokens for exact tokens using Uniswap V3 | ||
| */ | ||
| function swapTokensForExactTokens( | ||
| address inputToken, | ||
| uint256 amountOut, | ||
| address outputToken, | ||
| address uniswapRouter, | ||
| address wzeta | ||
| ) internal returns (uint256) { | ||
| // Approve router to spend input tokens | ||
| IERC20(inputToken).approve(uniswapRouter, type(uint256).max); | ||
|
|
||
| // Try direct swap first | ||
| try | ||
| ISwapRouter(uniswapRouter).exactOutputSingle( | ||
| ISwapRouter.ExactOutputSingleParams({ | ||
| tokenIn: inputToken, | ||
| tokenOut: outputToken, | ||
| fee: POOL_FEE, | ||
| recipient: address(this), | ||
| deadline: block.timestamp + 15 minutes, | ||
| amountOut: amountOut, | ||
| amountInMaximum: type(uint256).max, // Let Uniswap handle slippage | ||
| sqrtPriceLimitX96: 0 | ||
| }) | ||
| ) | ||
| returns (uint256 amountIn) { | ||
| return amountIn; | ||
| } catch { | ||
| // If direct swap fails, try through WZETA using exactOutput for multi-hop | ||
| // The path is encoded as (tokenOut, fee, WZETA, fee, tokenIn) in reverse order | ||
| bytes memory path = abi.encodePacked( | ||
| outputToken, | ||
| POOL_FEE, | ||
| wzeta, | ||
| POOL_FEE, | ||
| inputToken | ||
| ); | ||
|
|
||
| ISwapRouter.ExactOutputParams memory params = ISwapRouter | ||
| .ExactOutputParams({ | ||
| path: path, | ||
| recipient: address(this), | ||
| deadline: block.timestamp + 15 minutes, | ||
| amountOut: amountOut, | ||
| amountInMaximum: type(uint256).max // Let Uniswap handle slippage | ||
| }); | ||
|
|
||
| return ISwapRouter(uniswapRouter).exactOutput(params); | ||
| } | ||
| } | ||
|
Comment on lines
+66
to
+114
Check warningCode scanning / Slither Unused return Medium |
||
| } | ||
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Code scanning / Slither
Unused return Medium