{ "contractName": "PairBPool", "abi": [ { "inputs": [ { "internalType": "address", "name": "input", "type": "address" }, { "internalType": "address", "name": "output", "type": "address" }, { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "bytes", "name": "data", "type": "bytes" } ], "name": "swap", "outputs": [], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "input", "type": "address" }, { "internalType": "address", "name": "output", "type": "address" }, { "internalType": "uint256", "name": "amountIn", "type": "uint256" }, { "internalType": "bytes", "name": "data", "type": "bytes" } ], "name": "getOutputAmount", "outputs": [ { "internalType": "uint256", "name": "amountOut", "type": "uint256" } ], "stateMutability": "nonpayable", "type": "function" } ], "metadata": 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"source": "// SPDX-License-Identifier: MIT\npragma solidity 0.6.8;\n\nimport \"@openzeppelin/contracts/math/SafeMath.sol\";\nimport \"@openzeppelin/contracts/token/ERC20/ERC20.sol\";\nimport \"../interfaces/balancer/IBPool.sol\";\nimport \"./ISwappaPairV1.sol\";\n\ncontract PairBPool is ISwappaPairV1 {\n\tusing SafeMath for uint;\n\n\tfunction swap(\n\t\taddress input,\n\t\taddress output,\n\t\taddress to,\n\t\tbytes calldata data\n\t) external override {\n\t\taddress poolAddr = parseData(data);\n\t\tuint inputAmount = ERC20(input).balanceOf(address(this));\n\t\trequire(\n\t\t\tERC20(input).approve(poolAddr, inputAmount),\n\t\t\t\"PairBPool: approve failed!\");\n\t\t(uint outputAmount,) = IBPool(poolAddr).swapExactAmountIn(\n\t\t\tinput,\n\t\t\tinputAmount,\n\t\t\toutput,\n\t\t\t0, // minAmountOut\n\t\t\t~uint256(0) // maxPrice\n\t\t);\n\t\trequire(\n\t\t\tERC20(output).transfer(to, outputAmount),\n\t\t\t\"PairBPool: transfer failed!\");\n\t}\n\n\tfunction parseData(bytes memory data) private pure returns (address poolAddr) {\n\t\trequire(data.length == 20, \"PairBPool: invalid data!\");\n\tassembly {\n\t poolAddr := mload(add(data, 20))\n\t}\n\t}\n\n\tfunction getOutputAmount(\n\t\taddress input,\n\t\taddress output,\n\t\tuint amountIn,\n\t\tbytes calldata data\n\t) external override returns (uint amountOut) {\n\t\tIBPool pool = IBPool(parseData(data));\n\t\tamountOut = pool.calcOutGivenIn(\n\t\t\tpool.getBalance(input),\n\t\t\tpool.getDenormalizedWeight(input),\n\t\t\tpool.getBalance(output),\n\t\t\tpool.getDenormalizedWeight(output),\n\t\t\tamountIn,\n\t\t\tpool.getSwapFee()\n\t\t);\n\t}\n}\n", "sourcePath": "/home/thezviad_gmail_com/src/swappa/contracts/swappa/PairBPool.sol", "ast": { "absolutePath": "project:/contracts/swappa/PairBPool.sol", "exportedSymbols": { "PairBPool": [ 5860 ] }, "id": 5861, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 5714, "literals": [ "solidity", "0.6", ".8" ], "nodeType": "PragmaDirective", "src": "32:22:49" }, { "absolutePath": "@openzeppelin/contracts/math/SafeMath.sol", "file": "@openzeppelin/contracts/math/SafeMath.sol", "id": 5715, "nodeType": "ImportDirective", "scope": 5861, "sourceUnit": 219, "src": "56:51:49", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/ERC20.sol", "file": "@openzeppelin/contracts/token/ERC20/ERC20.sol", "id": 5716, "nodeType": "ImportDirective", "scope": 5861, "sourceUnit": 726, "src": "108:55:49", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "project:/contracts/interfaces/balancer/IBPool.sol", "file": "../interfaces/balancer/IBPool.sol", "id": 5717, "nodeType": "ImportDirective", "scope": 5861, "sourceUnit": 1372, "src": "164:43:49", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "project:/contracts/swappa/ISwappaPairV1.sol", "file": "./ISwappaPairV1.sol", "id": 5718, "nodeType": "ImportDirective", "scope": 5861, "sourceUnit": 5326, "src": "208:29:49", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 5719, "name": "ISwappaPairV1", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 5325, "src": "261:13:49", "typeDescriptions": { "typeIdentifier": "t_contract$_ISwappaPairV1_$5325", "typeString": "contract ISwappaPairV1" } }, "id": 5720, "nodeType": "InheritanceSpecifier", "src": "261:13:49" } ], "contractDependencies": [ 5325 ], "contractKind": "contract", "documentation": null, "fullyImplemented": true, "id": 5860, "linearizedBaseContracts": [ 5860, 5325 ], "name": "PairBPool", "nodeType": "ContractDefinition", "nodes": [ { "id": 5723, "libraryName": { "contractScope": null, "id": 5721, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 218, "src": "284:8:49", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$218", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "278:24:49", "typeName": { "id": 5722, "name": "uint", "nodeType": "ElementaryTypeName", "src": "297:4:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "baseFunctions": [ 5311 ], "body": { "id": 5792, "nodeType": "Block", "src": "412:438:49", "statements": [ { "assignments": [ 5736 ], "declarations": [ { "constant": false, "id": 5736, "mutability": "mutable", "name": "poolAddr", "nodeType": "VariableDeclaration", "overrides": null, "scope": 5792, "src": "416:16:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 5735, "name": "address", "nodeType": "ElementaryTypeName", "src": "416:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" } ], "id": 5740, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 5738, "name": "data", "nodeType": 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"referencedDeclaration": 325, "src": "473:22:49", "typeDescriptions": { "typeIdentifier": "t_function_external_view$_t_address_$returns$_t_uint256_$", "typeString": "function (address) view external returns (uint256)" } }, "id": 5751, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "473:37:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "454:56:49" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 5758, "name": "poolAddr", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5736, "src": "547:8:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 5759, "name": "inputAmount", "nodeType": "Identifier", 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