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| 1 | +pragma solidity ^0.6.0; |
| 2 | + |
| 3 | +import "@openzeppelin/contracts/math/SafeMath.sol"; |
| 4 | +import "./interfaces/IUniswapExchange.sol"; |
| 5 | +import "./interfaces/IUniswapFactory.sol"; |
| 6 | +import "./interfaces/IUniswapRouterV2.sol"; |
| 7 | +import "./interfaces/ICurveFi.sol"; |
| 8 | +import "./interfaces/IWeth.sol"; |
| 9 | +import "./interfaces/IPermanentStorage.sol"; |
| 10 | + |
| 11 | +contract AMMQuoter { |
| 12 | + using SafeMath for uint256; |
| 13 | + /* Constants */ |
| 14 | + string public constant version = "5.1.0"; |
| 15 | + address private constant ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE; |
| 16 | + address private constant ZERO_ADDRESS = address(0); |
| 17 | + address public constant UNISWAP_V2_ROUTER_02_ADDRESS = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D; |
| 18 | + address public constant SUSHISWAP_ROUTER_ADDRESS = 0xd9e1cE17f2641f24aE83637ab66a2cca9C378B9F; |
| 19 | + address public immutable weth; |
| 20 | + IPermanentStorage public immutable permStorage; |
| 21 | + |
| 22 | + event CurveTokenAdded(address indexed makerAddress, address indexed assetAddress, int128 index); |
| 23 | + |
| 24 | + constructor(IPermanentStorage _permStorage, address _weth) public { |
| 25 | + permStorage = _permStorage; |
| 26 | + weth = _weth; |
| 27 | + } |
| 28 | + |
| 29 | + function isETH(address assetAddress) public pure returns (bool) { |
| 30 | + return (assetAddress == ZERO_ADDRESS || assetAddress == ETH_ADDRESS); |
| 31 | + } |
| 32 | + |
| 33 | + function getMakerOutAmount( |
| 34 | + address _makerAddr, |
| 35 | + address _takerAssetAddr, |
| 36 | + address _makerAssetAddr, |
| 37 | + uint256 _takerAssetAmount |
| 38 | + ) public view returns (uint256) { |
| 39 | + uint256 makerAssetAmount; |
| 40 | + if (_makerAddr == UNISWAP_V2_ROUTER_02_ADDRESS || _makerAddr == SUSHISWAP_ROUTER_ADDRESS) { |
| 41 | + IUniswapRouterV2 router = IUniswapRouterV2(_makerAddr); |
| 42 | + address[] memory path = new address[](2); |
| 43 | + if (isETH(_takerAssetAddr)) { |
| 44 | + path[0] = weth; |
| 45 | + path[1] = _makerAssetAddr; |
| 46 | + } else if (isETH(_makerAssetAddr)) { |
| 47 | + path[0] = _takerAssetAddr; |
| 48 | + path[1] = weth; |
| 49 | + } else { |
| 50 | + path[0] = _takerAssetAddr; |
| 51 | + path[1] = _makerAssetAddr; |
| 52 | + } |
| 53 | + uint256[] memory amounts = router.getAmountsOut(_takerAssetAmount, path); |
| 54 | + makerAssetAmount = amounts[1]; |
| 55 | + } else { |
| 56 | + address curveTakerIntenalAsset = isETH(_takerAssetAddr) ? ETH_ADDRESS : _takerAssetAddr; |
| 57 | + address curveMakerIntenalAsset = isETH(_makerAssetAddr) ? ETH_ADDRESS : _makerAssetAddr; |
| 58 | + (int128 fromTokenCurveIndex, int128 toTokenCurveIndex, uint16 swapMethod, ) = permStorage.getCurvePoolInfo( |
| 59 | + _makerAddr, |
| 60 | + curveTakerIntenalAsset, |
| 61 | + curveMakerIntenalAsset |
| 62 | + ); |
| 63 | + if (fromTokenCurveIndex > 0 && toTokenCurveIndex > 0) { |
| 64 | + require(swapMethod != 0, "AMMQuoter: swap method not registered"); |
| 65 | + // Substract index by 1 because indices stored in `permStorage` starts from 1 |
| 66 | + fromTokenCurveIndex = fromTokenCurveIndex - 1; |
| 67 | + toTokenCurveIndex = toTokenCurveIndex - 1; |
| 68 | + ICurveFi curve = ICurveFi(_makerAddr); |
| 69 | + if (swapMethod == 1) { |
| 70 | + makerAssetAmount = curve.get_dy(fromTokenCurveIndex, toTokenCurveIndex, _takerAssetAmount).sub(1); |
| 71 | + } else if (swapMethod == 2) { |
| 72 | + makerAssetAmount = curve.get_dy_underlying(fromTokenCurveIndex, toTokenCurveIndex, _takerAssetAmount).sub(1); |
| 73 | + } |
| 74 | + } else { |
| 75 | + revert("AMMQuoter: Unsupported makerAddr"); |
| 76 | + } |
| 77 | + } |
| 78 | + return makerAssetAmount; |
| 79 | + } |
| 80 | + |
| 81 | + function getBestOutAmount( |
| 82 | + address[] calldata _makerAddresses, |
| 83 | + address _takerAssetAddr, |
| 84 | + address _makerAssetAddr, |
| 85 | + uint256 _takerAssetAmount |
| 86 | + ) external view returns (address bestMaker, uint256 bestAmount) { |
| 87 | + bestAmount = 0; |
| 88 | + uint256 poolLength = _makerAddresses.length; |
| 89 | + for (uint256 i = 0; i < poolLength; i++) { |
| 90 | + address makerAddress = _makerAddresses[i]; |
| 91 | + uint256 makerAssetAmount = getMakerOutAmount(makerAddress, _takerAssetAddr, _makerAssetAddr, _takerAssetAmount); |
| 92 | + if (makerAssetAmount > bestAmount) { |
| 93 | + bestAmount = makerAssetAmount; |
| 94 | + bestMaker = makerAddress; |
| 95 | + } |
| 96 | + } |
| 97 | + return (bestMaker, bestAmount); |
| 98 | + } |
| 99 | + |
| 100 | + function getTakerInAmount( |
| 101 | + address _makerAddr, |
| 102 | + address _takerAssetAddr, |
| 103 | + address _makerAssetAddr, |
| 104 | + uint256 _makerAssetAmount |
| 105 | + ) public view returns (uint256) { |
| 106 | + uint256 takerAssetAmount; |
| 107 | + if (_makerAddr == UNISWAP_V2_ROUTER_02_ADDRESS || _makerAddr == SUSHISWAP_ROUTER_ADDRESS) { |
| 108 | + IUniswapRouterV2 router = IUniswapRouterV2(_makerAddr); |
| 109 | + address[] memory path = new address[](2); |
| 110 | + if (isETH(_takerAssetAddr)) { |
| 111 | + path[0] = weth; |
| 112 | + path[1] = _makerAssetAddr; |
| 113 | + } else if (isETH(_makerAssetAddr)) { |
| 114 | + path[0] = _takerAssetAddr; |
| 115 | + path[1] = weth; |
| 116 | + } else { |
| 117 | + path[0] = _takerAssetAddr; |
| 118 | + path[1] = _makerAssetAddr; |
| 119 | + } |
| 120 | + uint256[] memory amounts = router.getAmountsIn(_makerAssetAmount, path); |
| 121 | + takerAssetAmount = amounts[0]; |
| 122 | + } else { |
| 123 | + address curveTakerIntenalAsset = isETH(_takerAssetAddr) ? ETH_ADDRESS : _takerAssetAddr; |
| 124 | + address curveMakerIntenalAsset = isETH(_makerAssetAddr) ? ETH_ADDRESS : _makerAssetAddr; |
| 125 | + (int128 fromTokenCurveIndex, int128 toTokenCurveIndex, uint16 swapMethod, bool supportGetDx) = permStorage.getCurvePoolInfo( |
| 126 | + _makerAddr, |
| 127 | + curveTakerIntenalAsset, |
| 128 | + curveMakerIntenalAsset |
| 129 | + ); |
| 130 | + if (fromTokenCurveIndex > 0 && toTokenCurveIndex > 0) { |
| 131 | + require(swapMethod != 0, "AMMQuoter: swap method not registered"); |
| 132 | + // Substract index by 1 because indices stored in `permStorage` starts from 1 |
| 133 | + fromTokenCurveIndex = fromTokenCurveIndex - 1; |
| 134 | + toTokenCurveIndex = toTokenCurveIndex - 1; |
| 135 | + ICurveFi curve = ICurveFi(_makerAddr); |
| 136 | + if (supportGetDx) { |
| 137 | + if (swapMethod == 1) { |
| 138 | + takerAssetAmount = curve.get_dx(fromTokenCurveIndex, toTokenCurveIndex, _makerAssetAmount); |
| 139 | + } else if (swapMethod == 2) { |
| 140 | + takerAssetAmount = curve.get_dx_underlying(fromTokenCurveIndex, toTokenCurveIndex, _makerAssetAmount); |
| 141 | + } |
| 142 | + } else { |
| 143 | + if (swapMethod == 1) { |
| 144 | + // does not support get_dx_underlying, try to get an estimated rate here |
| 145 | + takerAssetAmount = curve.get_dy(toTokenCurveIndex, fromTokenCurveIndex, _makerAssetAmount); |
| 146 | + } else if (swapMethod == 2) { |
| 147 | + takerAssetAmount = curve.get_dy_underlying(toTokenCurveIndex, fromTokenCurveIndex, _makerAssetAmount); |
| 148 | + } |
| 149 | + } |
| 150 | + } else { |
| 151 | + revert("AMMQuoter: Unsupported makerAddr"); |
| 152 | + } |
| 153 | + } |
| 154 | + return takerAssetAmount; |
| 155 | + } |
| 156 | + |
| 157 | + function getBestInAmount( |
| 158 | + address[] calldata _makerAddresses, |
| 159 | + address _takerAssetAddr, |
| 160 | + address _makerAssetAddr, |
| 161 | + uint256 _makerAssetAmount |
| 162 | + ) external view returns (address bestMaker, uint256 bestAmount) { |
| 163 | + bestAmount = 2**256 - 1; |
| 164 | + uint256 poolLength = _makerAddresses.length; |
| 165 | + for (uint256 i = 0; i < poolLength; i++) { |
| 166 | + address makerAddress = _makerAddresses[i]; |
| 167 | + uint256 takerAssetAmount = getTakerInAmount(makerAddress, _takerAssetAddr, _makerAssetAddr, _makerAssetAmount); |
| 168 | + if (takerAssetAmount < bestAmount) { |
| 169 | + bestAmount = takerAssetAmount; |
| 170 | + bestMaker = makerAddress; |
| 171 | + } |
| 172 | + } |
| 173 | + return (bestMaker, bestAmount); |
| 174 | + } |
| 175 | +} |
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