@valueswap/v2-periphery

{ "contractName": "ExampleFlashSwap", "abi": [ { "inputs": [ { "internalType": "address", "name": "_factory", "type": "address" }, { "internalType": "address", "name": "_factoryV1", "type": "address" }, { "internalType": "address", "name": "router", "type": "address" } ], "stateMutability": "nonpayable", "type": "constructor" }, { "stateMutability": "payable", "type": "receive" }, { "inputs": [ { "internalType": "address", "name": "sender", "type": "address" }, { "internalType": "uint256", "name": "amount0", "type": "uint256" }, { "internalType": "uint256", "name": "amount1", "type": "uint256" }, { "internalType": "bytes", "name": "data", "type": "bytes" } ], "name": "valueswapV2Call", "outputs": [], "stateMutability": "nonpayable", "type": "function" } ], "metadata": "{\"compiler\":{\"version\":\"0.6.6+commit.6c089d02\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_factory\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"_factoryV1\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"router\",\"type\":\"address\"}],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"sender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount0\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"amount1\",\"type\":\"uint256\"},{\"internalType\":\"bytes\",\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"valueswapV2Call\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"stateMutability\":\"payable\",\"type\":\"receive\"}],\"devdoc\":{\"methods\":{}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"/Users/second/Documents/work/valueswap-v2-periphery/contracts/examples/ExampleFlashSwap.sol\":\"ExampleFlashSwap\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":999999},\"remappings\":[]},\"sources\":{\"/Users/second/Documents/work/valueswap-v2-periphery/contracts/examples/ExampleFlashSwap.sol\":{\"keccak256\":\"0x2624b41a44e62b12d214a591fb11f9bd07ed2d3cf2aa9a128c081dbd98dbe1d6\",\"urls\":[\"bzz-raw://470c8cf2903b9c9b5d86a72bbc5318d38ea20d530be467ca383889d05ec68ac2\",\"dweb:/ipfs/QmeM2TK7pt2ncPpk9c9GrJQAgkW6zSFcQ67umtqLenDpMn\"]},\"/Users/second/Documents/work/valueswap-v2-periphery/contracts/interfaces/IERC20.sol\":{\"keccak256\":\"0x61db17aebc5d812c7002d15c1da954065e56abe49d64b14c034abe5604d70eb3\",\"urls\":[\"bzz-raw://b006685e753f9120469f10b09c159f222d4cb8b507a6c1f0c14ed50c883ebe66\",\"dweb:/ipfs/QmSyY7iTugbczPwfGK67etiyPULenYGzzRYbt8aabwwkUb\"]},\"/Users/second/Documents/work/valueswap-v2-periphery/contracts/interfaces/IValueswapV2Router01.sol\":{\"keccak256\":\"0x36353f46a62274a8eba493ea0bed9284da4f97e30025def7688d84de95552826\",\"urls\":[\"bzz-raw://e258df9bf935cb183c593417f96967ffcb32e438d834a6840cc8c51ab61dfce8\",\"dweb:/ipfs/QmWqucAgec2mSqtMzMDFSaJWQFUByvw1L6oodDZEwYm5vk\"]},\"/Users/second/Documents/work/valueswap-v2-periphery/contracts/interfaces/IWETH.sol\":{\"keccak256\":\"0xfc10758fd8dba790c39468dccd358cb7cef06ae7c4781832cc7aa76f91f167e6\",\"urls\":[\"bzz-raw://dc22493dea6c60d47835eeba53726f8a6f76f4fcd798d40e54608a1380515d49\",\"dweb:/ipfs/QmS1QVcBRH4TELYNE7XCfjSVQEWFupyaNLKmMkKH7iPjrm\"]},\"/Users/second/Documents/work/valueswap-v2-periphery/contracts/interfaces/V1/IValueswapV1Exchange.sol\":{\"keccak256\":\"0x18347987e5ec9f2db6d046221e16425bbbd2b615f7d857e581eaa3c4622a299e\",\"urls\":[\"bzz-raw://152e46b593cc84f238a26ac798a240a104f83473db87528a1dd90f4624dd70b9\",\"dweb:/ipfs/QmVCrpGsk4cmvLBN56tdcdtaZojFFkwsNrKWw9oZSjRkAT\"]},\"/Users/second/Documents/work/valueswap-v2-periphery/contracts/interfaces/V1/IValueswapV1Factory.sol\":{\"keccak256\":\"0x97cf41f192263151cb96dc3c80d52b155ab550df4814fa66fe7fef808fd2ffab\",\"urls\":[\"bzz-raw://1d67f84c9bcb570a8aaaeb2108a81a454b4516bc67fabfec93f701db30eed84e\",\"dweb:/ipfs/QmYHtYT7E3ftKLdQbCciwjgSipYxt4sr8VVhPyDmLZfC1g\"]},\"/Users/second/Documents/work/valueswap-v2-periphery/contracts/libraries/SafeMath.sol\":{\"keccak256\":\"0x27f0ea82f879b3b01387b583e6d9d0ec858dca3b22b0aad173f8fbda06e761e1\",\"urls\":[\"bzz-raw://0db9cf37793eb7035f0bfced36323d240f0212150009c39a3a108701d9b50b6c\",\"dweb:/ipfs/QmUAdiG9XNcieXkKfiMB49zQqD34FbXFE15csV2KQzwEqg\"]},\"/Users/second/Documents/work/valueswap-v2-periphery/contracts/libraries/ValueswapV2Library.sol\":{\"keccak256\":\"0xf676dcf67bcef334c141c95ae2c8328c76bcaf316edd882fe9bf960dc7887904\",\"urls\":[\"bzz-raw://37aa805cf7db173d7465a186acb5d9a958c8d1628c2335807c054e7864501dc5\",\"dweb:/ipfs/QmbZhcmRJkPLzsfMoNbeRZ8UKrqsjF86QNiZjsYyfxg9t6\"]},\"@valueswap/v2-core/contracts/interfaces/IValueswapV2Callee.sol\":{\"keccak256\":\"0x6ae31ab548230a0da52d5478beb1759507c55d9be5bbb3393dd84f769c796781\",\"urls\":[\"bzz-raw://f94793e529f221f55f6eb94ea18c28a7dc4c393c16a036efbe292eb83fd00d89\",\"dweb:/ipfs/QmbbBRZV73opEXQHrW8txVHNCXCrXM2f6eLnB6qTGGXKFi\"]},\"@valueswap/v2-core/contracts/interfaces/IValueswapV2Pair.sol\":{\"keccak256\":\"0x4899f60670cbc336cd8f5fefb631d6ce27ae4226ad4aac5d0963cd23db2fc36a\",\"urls\":[\"bzz-raw://7aa68c3572d1a4713c4af9ba99dd1907a9dc5a104273dab86e1d02797f6b1dd6\",\"dweb:/ipfs/QmXq89Vb6D4XeA2PDqNy13VkNeevTJePCrLF7KUHkver4q\"]}},\"version\":1}", 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"source": "pragma solidity =0.6.6;\n\nimport '@valueswap/v2-core/contracts/interfaces/IValueswapV2Callee.sol';\n\nimport '../libraries/ValueswapV2Library.sol';\nimport '../interfaces/V1/IValueswapV1Factory.sol';\nimport '../interfaces/V1/IValueswapV1Exchange.sol';\nimport '../interfaces/IValueswapV2Router01.sol';\nimport '../interfaces/IERC20.sol';\nimport '../interfaces/IWETH.sol';\n\ncontract ExampleFlashSwap is IValueswapV2Callee {\n IValueswapV1Factory immutable factoryV1;\n address immutable factory;\n IWETH immutable WETH;\n\n constructor(address _factory, address _factoryV1, address router) public {\n factoryV1 = IValueswapV1Factory(_factoryV1);\n factory = _factory;\n WETH = IWETH(IValueswapV2Router01(router).WETH());\n }\n\n // needs to accept ETH from any V1 exchange and WETH. ideally this could be enforced, as in the router,\n // but it's not possible because it requires a call to the v1 factory, which takes too much gas\n receive() external payable {}\n\n // gets tokens/WETH via a V2 flash swap, swaps for the ETH/tokens on V1, repays V2, and keeps the rest!\n function valueswapV2Call(address sender, uint amount0, uint amount1, bytes calldata data) external override {\n address[] memory path = new address[](2);\n uint amountToken;\n uint amountETH;\n { // scope for token{0,1}, avoids stack too deep errors\n address token0 = IValueswapV2Pair(msg.sender).token0();\n address token1 = IValueswapV2Pair(msg.sender).token1();\n assert(msg.sender == ValueswapV2Library.pairFor(factory, token0, token1)); // ensure that msg.sender is actually a V2 pair\n assert(amount0 == 0 || amount1 == 0); // this strategy is unidirectional\n path[0] = amount0 == 0 ? token0 : token1;\n path[1] = amount0 == 0 ? token1 : token0;\n amountToken = token0 == address(WETH) ? amount1 : amount0;\n amountETH = token0 == address(WETH) ? amount0 : amount1;\n }\n\n assert(path[0] == address(WETH) || path[1] == address(WETH)); // this strategy only works with a V2 WETH pair\n IERC20 token = IERC20(path[0] == address(WETH) ? path[1] : path[0]);\n IValueswapV1Exchange exchangeV1 = IValueswapV1Exchange(factoryV1.getExchange(address(token))); // get V1 exchange\n\n if (amountToken > 0) {\n (uint minETH) = abi.decode(data, (uint)); // slippage parameter for V1, passed in by caller\n token.approve(address(exchangeV1), amountToken);\n uint amountReceived = exchangeV1.tokenToEthSwapInput(amountToken, minETH, uint(-1));\n uint amountRequired = ValueswapV2Library.getAmountsIn(factory, amountToken, path)[0];\n assert(amountReceived > amountRequired); // fail if we didn't get enough ETH back to repay our flash loan\n WETH.deposit{value: amountRequired}();\n assert(WETH.transfer(msg.sender, amountRequired)); // return WETH to V2 pair\n (bool success,) = sender.call{value: amountReceived - amountRequired}(new bytes(0)); // keep the rest! (ETH)\n assert(success);\n } else {\n (uint minTokens) = abi.decode(data, (uint)); // slippage parameter for V1, passed in by caller\n WETH.withdraw(amountETH);\n uint amountReceived = exchangeV1.ethToTokenSwapInput{value: amountETH}(minTokens, uint(-1));\n uint amountRequired = ValueswapV2Library.getAmountsIn(factory, amountETH, path)[0];\n assert(amountReceived > amountRequired); // fail if we didn't get enough tokens back to repay our flash loan\n assert(token.transfer(msg.sender, amountRequired)); // return tokens to V2 pair\n assert(token.transfer(sender, amountReceived - amountRequired)); // keep the rest! (tokens)\n }\n }\n}\n", "sourcePath": "/Users/second/Documents/work/valueswap-v2-periphery/contracts/examples/ExampleFlashSwap.sol", "ast": { "absolutePath": "/Users/second/Documents/work/valueswap-v2-periphery/contracts/examples/ExampleFlashSwap.sol", "exportedSymbols": { "ExampleFlashSwap": [ 4075 ] }, "id": 4076, "nodeType": "SourceUnit", "nodes": [ { "id": 3700, "literals": [ "solidity", "=", "0.6", ".6" ], "nodeType": "PragmaDirective", "src": "0:23:4" }, { "absolutePath": "@valueswap/v2-core/contracts/interfaces/IValueswapV2Callee.sol", "file": "@valueswap/v2-core/contracts/interfaces/IValueswapV2Callee.sol", "id": 3701, "nodeType": "ImportDirective", "scope": 4076, "sourceUnit": 9054, "src": "25:72:4", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/Users/second/Documents/work/valueswap-v2-periphery/contracts/libraries/ValueswapV2Library.sol", "file": "../libraries/ValueswapV2Library.sol", "id": 3702, "nodeType": "ImportDirective", "scope": 4076, "sourceUnit": 6054, "src": "99:45:4", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/Users/second/Documents/work/valueswap-v2-periphery/contracts/interfaces/V1/IValueswapV1Factory.sol", "file": "../interfaces/V1/IValueswapV1Factory.sol", "id": 3703, "nodeType": "ImportDirective", "scope": 4076, "sourceUnit": 5507, "src": "145:50:4", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/Users/second/Documents/work/valueswap-v2-periphery/contracts/interfaces/V1/IValueswapV1Exchange.sol", "file": "../interfaces/V1/IValueswapV1Exchange.sol", "id": 3704, "nodeType": "ImportDirective", "scope": 4076, "sourceUnit": 5497, "src": "196:51:4", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/Users/second/Documents/work/valueswap-v2-periphery/contracts/interfaces/IValueswapV2Router01.sol", "file": "../interfaces/IValueswapV2Router01.sol", "id": 3705, "nodeType": "ImportDirective", "scope": 4076, "sourceUnit": 5333, "src": "248:48:4", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/Users/second/Documents/work/valueswap-v2-periphery/contracts/interfaces/IERC20.sol", "file": "../interfaces/IERC20.sol", "id": 3706, "nodeType": "ImportDirective", "scope": 4076, "sourceUnit": 5009, "src": "297:34:4", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/Users/second/Documents/work/valueswap-v2-periphery/contracts/interfaces/IWETH.sol", "file": "../interfaces/IWETH.sol", "id": 3707, "nodeType": "ImportDirective", "scope": 4076, "sourceUnit": 5441, "src": "332:33:4", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 3708, "name": "IValueswapV2Callee", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 9053, "src": "396:18:4", "typeDescriptions": { "typeIdentifier": "t_contract$_IValueswapV2Callee_$9053", "typeString": "contract IValueswapV2Callee" } }, "id": 3709, "nodeType": "InheritanceSpecifier", "src": "396:18:4" } ], "contractDependencies": 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