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Add uniswap v3 index exchange adapter (#89)
* Add external Uniswap V3 contracts * Add UniswapV3 Index Exchange Adapter contract * Modify compiler-version in .solhint.json * Add tests * Fix coverage * Improve javadocs and add getEncodedTradePath() test * Use soldityPack in getEncodedTradePath test * Change compiler version to 0.6.10 * Add suggested changes * Remove getTradeEncodedPath function * Remove @uniswap/v3-periphery as dependency * Add @uniswap/v3-core as dependency * Use exactInputSingle and exactOutputSingle functions instead of exactInput and exactOutput * Move BytesLib to external/contracts/uniswap/v3 * Add Note to set exchange data in GIM * Remove @uniswap/v3-core dependency *Add suggested changes * Add getEncodedFeeData function and add suggested changes * Refactor tests to use UniswapV3 Fixture * Fix uniswap/v3/SwapRotuer ABI * Add integration tests with GIM * Trade DAI for WETH on UniswapV3 during rebalance * Trade WETH for WBTC on UniswapV3 during rebalance * Fix comment
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‎contracts/interfaces/external/ISwapRouter.sol

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@@ -63,4 +63,4 @@ interface ISwapRouter {
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/// @param params The parameters necessary for the multi-hop swap, encoded as `ExactOutputParams` in calldata
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/// @return amountIn The amount of the input token
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function exactOutput(ExactOutputParams calldata params) external payable returns (uint256 amountIn);
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}
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}

‎contracts/protocol/integration/index-exchange/UniswapV3IndexExchangeAdapter.sol

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@@ -0,0 +1,158 @@
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/*
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Copyright 2021 Set Labs Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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SPDX-License-Identifier: Apache License, Version 2.0
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*/
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pragma solidity 0.6.10;
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pragma experimental "ABIEncoderV2";
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import { ISwapRouter } from "contracts/interfaces/external/ISwapRouter.sol";
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import { BytesLib } from "external/contracts/uniswap/v3/lib/BytesLib.sol";
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import { IIndexExchangeAdapter } from "../../../interfaces/IIndexExchangeAdapter.sol";
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/**
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* @title UniswapV3IndexExchangeAdapter
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* @author Set Protocol
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*
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* A Uniswap V3 exchange adapter that returns calldata for trading with GeneralIndexModule, allows encoding a trade with a fixed input quantity or
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* a fixed output quantity.
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*/
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contract UniswapV3IndexExchangeAdapter is IIndexExchangeAdapter {
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using BytesLib for bytes;
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/* ============ Constants ============ */
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// Uniswap router function string for swapping exact amount of input tokens for a minimum of output tokens
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string internal constant SWAP_EXACT_INPUT = "exactInputSingle((address,address,uint24,address,uint256,uint256,uint256,uint160))";
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// Uniswap router function string for swapping max amoutn of input tokens for an exact amount of output tokens
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string internal constant SWAP_EXACT_OUTPUT = "exactOutputSingle((address,address,uint24,address,uint256,uint256,uint256,uint160))";
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/* ============ State Variables ============ */
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// Address of Uniswap V3 SwapRouter contract
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address public immutable router;
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/* ============ Constructor ============ */
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/**
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* Set state variables
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*
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* @param _router Address of Uniswap V3 SwapRouter contract
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*/
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constructor(address _router) public {
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router = _router;
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}
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/* ============ External Getter Functions ============ */
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/**
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* Return calldata for trading with Uniswap V3 SwapRouter. Trade paths are created from _sourceToken,
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* _destinationToken and pool fees (which is encoded in _data).
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*
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* ---------------------------------------------------------------------------------------------------------------
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* _isSendTokenFixed | Parameter | Amount |
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* ---------------------------------------------------------------------------------------------------------------
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* True | _sourceQuantity | Fixed amount of _sourceToken to trade |
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* | _destinationQuantity | Minimum amount of _destinationToken willing to receive |
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* ---------------------------------------------------------------------------------------------------------------
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* False | _sourceQuantity | Maximum amount of _sourceToken to trade |
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* | _destinationQuantity | Fixed amount of _destinationToken want to receive |
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* ---------------------------------------------------------------------------------------------------------------
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*
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* @param _sourceToken Address of source token to be sold
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* @param _destinationToken Address of destination token to buy
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* @param _destinationAddress Address that assets should be transferred to
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* @param _isSendTokenFixed Boolean indicating if the send quantity is fixed, used to determine correct trade interface
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* @param _sourceQuantity Fixed/Max amount of source token to sell
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* @param _destinationQuantity Min/Fixed amount of destination token to buy
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* @param _data Arbitrary bytes containing fees value, expressed in hundredths of a bip,
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* used to determine the pool to trade among similar asset pools on Uniswap V3.
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* Note: SetToken manager must set the appropriate pool fees via `setExchangeData` in GeneralIndexModule
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* for each component that needs to be traded on UniswapV3. This is different from UniswapV3ExchangeAdapter,
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* where `_data` represents UniswapV3 trade path vs just the pool fees percentage.
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*
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* @return address Target contract address
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* @return uint256 Call value
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* @return bytes Trade calldata
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*/
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function getTradeCalldata(
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address _sourceToken,
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address _destinationToken,
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address _destinationAddress,
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bool _isSendTokenFixed,
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uint256 _sourceQuantity,
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uint256 _destinationQuantity,
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bytes memory _data
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)
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external
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view
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override
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returns (address, uint256, bytes memory)
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{
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uint24 fee = _data.toUint24(0);
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bytes memory callData = _isSendTokenFixed
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? abi.encodeWithSignature(
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SWAP_EXACT_INPUT,
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ISwapRouter.ExactInputSingleParams(
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_sourceToken,
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_destinationToken,
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fee,
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_destinationAddress,
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block.timestamp,
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_sourceQuantity,
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_destinationQuantity,
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0
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)
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) : abi.encodeWithSignature(
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SWAP_EXACT_OUTPUT,
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ISwapRouter.ExactOutputSingleParams(
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_sourceToken,
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_destinationToken,
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fee,
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_destinationAddress,
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block.timestamp,
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_destinationQuantity,
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_sourceQuantity,
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0
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)
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);
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return (router, 0, callData);
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}
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/**
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* Returns the address to approve source tokens to for trading. This is the Uniswap V3 router address.
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*
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* @return address Address of the contract to approve tokens to
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*/
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function getSpender() external view override returns (address) {
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return router;
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}
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/**
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* Helper that returns encoded fee value.
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*
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* @param fee UniswapV3 pool fee percentage, expressed in hundredths of a bip
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*
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* @return bytes Encoded fee value
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*/
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function getEncodedFeeData(uint24 fee) external view returns (bytes memory) {
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return abi.encodePacked(fee);
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}
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}

‎external/abi/uniswap/v3/SwapRouter.json

Lines changed: 7 additions & 7 deletions
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‎external/contracts/uniswap/v3/UniswapV3Factory.sol

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@@ -70,4 +70,4 @@ contract UniswapV3Factory is IUniswapV3Factory, UniswapV3PoolDeployer, NoDelegat
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feeAmountTickSpacing[fee] = tickSpacing;
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emit FeeAmountEnabled(fee, tickSpacing);
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}
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}
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}

‎external/contracts/uniswap/v3/lib/BytesLib.sol

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@@ -6,17 +6,17 @@
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* @dev Bytes tightly packed arrays utility library for ethereum contracts written in Solidity.
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* The library lets you concatenate, slice and type cast bytes arrays both in memory and storage.
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*/
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pragma solidity >=0.5.0 <0.8.0;
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pragma solidity 0.6.10;
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library BytesLib {
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function slice(
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bytes memory _bytes,
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uint256 _start,
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uint256 _length
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) internal pure returns (bytes memory) {
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require(_length + 31 >= _length, 'slice_overflow');
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require(_start + _length >= _start, 'slice_overflow');
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require(_bytes.length >= _start + _length, 'slice_outOfBounds');
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require(_length + 31 >= _length, "slice_overflow");
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require(_start + _length >= _start, "slice_overflow");
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require(_bytes.length >= _start + _length, "slice_outOfBounds");
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bytes memory tempBytes;
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}
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function toAddress(bytes memory _bytes, uint256 _start) internal pure returns (address) {
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require(_start + 20 >= _start, 'toAddress_overflow');
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require(_bytes.length >= _start + 20, 'toAddress_outOfBounds');
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require(_start + 20 >= _start, "toAddress_overflow");
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require(_bytes.length >= _start + 20, "toAddress_outOfBounds");
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address tempAddress;
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assembly {
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}
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function toUint24(bytes memory _bytes, uint256 _start) internal pure returns (uint24) {
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require(_start + 3 >= _start, 'toUint24_overflow');
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require(_bytes.length >= _start + 3, 'toUint24_outOfBounds');
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require(_start + 3 >= _start, "toUint24_overflow");
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require(_bytes.length >= _start + 3, "toUint24_outOfBounds");
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uint24 tempUint;
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assembly {

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