Tasks: Implement Uniswap V3 swapper (#97)

Co-authored-by: Facu Spagnuolo <[email protected]>

packages/tasks/contracts/interfaces/swap/IUniswapV3Swapper.sol

@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+pragma solidity >=0.8.0;
+
+import './IBaseSwapTask.sol';
+
+/**
+ * @dev Uniswap v3 swapper task interface
+ */
+interface IUniswapV3Swapper is IBaseSwapTask {
+    /**
+     * @dev Execution function
+     */
+    function call(
+        address tokenIn,
+        uint256 amountIn,
+        uint256 minAmountOut,
+        uint24 fee,
+        address[] memory hopTokens,
+        uint24[] memory hopFees
+    ) external;
+}

packages/tasks/contracts/swap/UniswapV3Swapper.sol

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+// SPDX-License-Identifier: GPL-3.0-or-later
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+pragma solidity ^0.8.0;
+
+import '@mimic-fi/v3-helpers/contracts/math/FixedPoint.sol';
+import '@mimic-fi/v3-helpers/contracts/utils/BytesHelpers.sol';
+import '@mimic-fi/v3-connectors/contracts/interfaces/swap/IUniswapV3Connector.sol';
+
+import './BaseSwapTask.sol';
+import '../interfaces/swap/IUniswapV3Swapper.sol';
+
+/**
+ * @title Uniswap v3 swapper task
+ * @dev Task that extends the swapper task to use Uniswap v3
+ */
+contract UniswapV3Swapper is IUniswapV3Swapper, BaseSwapTask {
+    using FixedPoint for uint256;
+    using BytesHelpers for bytes;
+
+    // Execution type for relayers
+    bytes32 public constant override EXECUTION_TYPE = keccak256('UNISWAP_V3_SWAPPER');
+
+    /**
+     * @dev Uniswap v3 swap config. Only used in the initializer.
+     */
+    struct UniswapV3SwapConfig {
+        BaseSwapConfig baseSwapConfig;
+    }
+
+    /**
+     * @dev Initializes the Uniswap v3 swapper
+     * @param config Uniswap v3 swap config
+     */
+    function initialize(UniswapV3SwapConfig memory config) external initializer {
+        __UniswapV3Swapper_init(config);
+    }
+
+    /**
+     * @dev Initializes the Uniswap V3 swapper. It does call upper contracts.
+     * @param config Uniswap v3 swap config
+     */
+    function __UniswapV3Swapper_init(UniswapV3SwapConfig memory config) internal onlyInitializing {
+        __BaseSwapTask_init(config.baseSwapConfig);
+        __UniswapV3Swapper_init_unchained(config);
+    }
+
+    /**
+     * @dev Initializes the Uniswap V3 swapper. It does not call upper contracts.
+     * @param config Uniswap v3 swap config
+     */
+    function __UniswapV3Swapper_init_unchained(UniswapV3SwapConfig memory config) internal onlyInitializing {
+        // solhint-disable-previous-line no-empty-blocks
+    }
+
+    /**
+     * @dev Executes the Uniswap v3 swapper task
+     */
+    function call(
+        address tokenIn,
+        uint256 amountIn,
+        uint256 slippage,
+        uint24 fee,
+        address[] memory hopTokens,
+        uint24[] memory hopFees
+    ) external override authP(authParams(tokenIn, amountIn, slippage, fee)) {
+        if (amountIn == 0) amountIn = getTaskAmount(tokenIn);
+        _beforeUniswapV3Swapper(tokenIn, amountIn, slippage);
+
+        address tokenOut = getTokenOut(tokenIn);
+        uint256 price = _getPrice(tokenIn, tokenOut);
+        uint256 minAmountOut = amountIn.mulUp(price).mulUp(FixedPoint.ONE - slippage);
+
+        bytes memory connectorData = abi.encodeWithSelector(
+            IUniswapV3Connector.execute.selector,
+            tokenIn,
+            tokenOut,
+            amountIn,
+            minAmountOut,
+            fee,
+            hopTokens,
+            hopFees
+        );
+
+        bytes memory result = ISmartVault(smartVault).execute(connector, connectorData);
+        _afterUniswapV3Swapper(tokenIn, amountIn, slippage, tokenOut, result.toUint256());
+    }
+
+    /**
+     * @dev Before Uniswap v3 swapper task
+     */
+    function _beforeUniswapV3Swapper(address token, uint256 amount, uint256 slippage) internal virtual {
+        _beforeBaseSwapTask(token, amount, slippage);
+    }
+
+    /**
+     * @dev After Uniswap v3 swapper hook
+     */
+    function _afterUniswapV3Swapper(
+        address tokenIn,
+        uint256 amountIn,
+        uint256 slippage,
+        address tokenOut,
+        uint256 amountOut
+    ) internal virtual {
+        _afterBaseSwapTask(tokenIn, amountIn, slippage, tokenOut, amountOut);
+    }
+}

packages/tasks/contracts/test/swap/UniswapV3ConnectorMock.sol

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+// SPDX-License-Identifier: GPL-3.0-or-later
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+pragma solidity ^0.8.0;
+
+contract UniswapV3ConnectorMock {
+    event LogExecute(
+        address tokenIn,
+        address tokenOut,
+        uint256 amountIn,
+        uint256 minAmountOut,
+        uint24 fee,
+        address[] hopTokens,
+        uint24[] hopFees
+    );
+
+    function execute(
+        address tokenIn,
+        address tokenOut,
+        uint256 amountIn,
+        uint256 minAmountOut,
+        uint24 fee,
+        address[] memory hopTokens,
+        uint24[] memory hopFees
+    ) external returns (uint256) {
+        emit LogExecute(tokenIn, tokenOut, amountIn, minAmountOut, fee, hopTokens, hopFees);
+        return minAmountOut;
+    }
+}