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| @@ -1,99 +1,4 @@ | ||
| // SPDX-License-Identifier: MIT | ||
| pragma solidity >=0.8.0 <0.9.0; | ||
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| import {IERC20} from "lib/composable-cow/lib/@openzeppelin/contracts/interfaces/IERC20.sol"; | ||
| import {ConditionalOrdersUtilsLib as Utils} from "lib/composable-cow/src/types/ConditionalOrdersUtilsLib.sol"; | ||
| import {BaseConditionalOrder, IConditionalOrderGenerator, IConditionalOrder} from "lib/composable-cow/src/BaseConditionalOrder.sol"; | ||
| import {GPv2Order} from "lib/composable-cow/lib/cowprotocol/src/contracts/libraries/GPv2Order.sol"; | ||
| import {IUniswapV2Pair} from "lib/uniswap-v2-core/contracts/interfaces/IUniswapV2Pair.sol"; | ||
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| contract ConstantProduct is BaseConditionalOrder { | ||
| uint256 internal constant MAX_BPS = 10_000; | ||
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| struct Data { | ||
| IERC20 tokenA; | ||
| IERC20 tokenB; | ||
| address target; | ||
| IUniswapV2Pair referencePair; | ||
| uint256 minTradeVolumeBps; | ||
| bytes32 appData; | ||
| } | ||
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| /** | ||
| * @inheritdoc IConditionalOrderGenerator | ||
| */ | ||
| function getTradeableOrder(address owner, address, bytes32, bytes calldata staticInput, bytes calldata) | ||
| public | ||
| view | ||
| override | ||
| returns (GPv2Order.Data memory order) | ||
| { | ||
| ConstantProduct.Data memory data = abi.decode(staticInput, (Data)); | ||
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| (uint256 my0, uint256 my1) = (data.tokenA.balanceOf(owner), data.tokenB.balanceOf(owner)); | ||
| uint256 myK = my0 * my1; | ||
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| (uint256 reserve0, uint256 reserve1) = (0, 0); | ||
| if (data.referencePair.token0() == address(data.tokenA) && data.referencePair.token1() == address(data.tokenB)) | ||
| { | ||
| (reserve0, reserve1,) = data.referencePair.getReserves(); | ||
| } else if ( | ||
| data.referencePair.token0() == address(data.tokenB) && data.referencePair.token1() == address(data.tokenA) | ||
| ) { | ||
| (reserve1, reserve0,) = data.referencePair.getReserves(); | ||
| } else { | ||
| revert("invalid pair"); | ||
| } | ||
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| uint256 new1 = sqrt(myK * reserve1 / reserve0); | ||
| uint256 new0 = myK / new1; | ||
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| order = GPv2Order.Data( | ||
| IERC20(address(0)), | ||
| IERC20(address(0)), | ||
| address(0), | ||
| 0, | ||
| 0, | ||
| Utils.validToBucket(3600), | ||
| data.appData, | ||
| 0, | ||
| GPv2Order.KIND_SELL, | ||
| true, | ||
| GPv2Order.BALANCE_ERC20, | ||
| GPv2Order.BALANCE_ERC20 | ||
| ); | ||
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| uint256 sellBalance = 0; | ||
| if (new1 > my1) { | ||
| sellBalance = my0; | ||
| order.sellToken = data.tokenA; | ||
| order.buyToken = data.tokenB; | ||
| order.sellAmount = my0 - new0 - 1; | ||
| order.buyAmount = new1 - my1 + 1; | ||
| } else { | ||
| sellBalance = my1; | ||
| order.sellToken = data.tokenB; | ||
| order.buyToken = data.tokenA; | ||
| order.sellAmount = my1 - new1 - 1; | ||
| order.buyAmount = new0 - my0 + 1; | ||
| } | ||
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| if (order.sellAmount < sellBalance * data.minTradeVolumeBps / MAX_BPS) { | ||
| revert IConditionalOrder.OrderNotValid("min amount"); | ||
| } | ||
| } | ||
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| // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method) | ||
| function sqrt(uint256 y) internal pure returns (uint256 z) { | ||
| if (y > 3) { | ||
| z = y; | ||
| uint256 x = y / 2 + 1; | ||
| while (x < z) { | ||
| z = x; | ||
| x = (y / x + x) / 2; | ||
| } | ||
| } else if (y != 0) { | ||
| z = 1; | ||
| } | ||
| } | ||
| } | ||
| contract ConstantProduct {} |
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,19 +1,4 @@ | ||
| // SPDX-License-Identifier: UNLICENSED | ||
| pragma solidity ^0.8.13; | ||
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| import {IERC20} from "lib/composable-cow/lib/@openzeppelin/contracts/interfaces/IERC20.sol"; | ||
| import {BaseComposableCoWTest} from "lib/composable-cow/test/ComposableCoW.base.t.sol"; | ||
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| import {ConstantProduct} from "../src/ConstantProduct.sol"; | ||
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| contract E2eCounterTest is BaseComposableCoWTest { | ||
| ConstantProduct constantProduct; | ||
| address safe; | ||
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| function setUp() public virtual override(BaseComposableCoWTest) { | ||
| super.setUp(); | ||
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| constantProduct = new ConstantProduct(); | ||
| } | ||
| } | ||
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| contract E2eCounterTest {} |