{ "contractName": "UniswapOracle", "abi": [ { "inputs": [ { "internalType": "address", "name": "_factory", "type": "address" } ], "stateMutability": "nonpayable", "type": "constructor" }, { "inputs": [], "name": "PERIOD", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "factory", "outputs": [ { "internalType": "address", "name": "", "type": "address" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "_tokenIn", "type": "address" }, { "internalType": "address", "name": "_tokenOut", "type": "address" } ], "name": "update", "outputs": [], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "_tokenIn", "type": "address" }, { "internalType": "uint256", "name": "_amountIn", "type": "uint256" }, { "internalType": "address", "name": "_tokenOut", "type": "address" } ], "name": "consult", "outputs": [ { "internalType": "uint256", "name": "_amountOut", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "_tokenIn", "type": "address" }, { "internalType": "uint256", "name": "_amountIn", "type": "uint256" }, { "internalType": "address", "name": "_tokenOut", "type": "address" } ], "name": "updateAndConsult", "outputs": [ { "internalType": "uint256", "name": "_amountOut", "type": "uint256" } ], "stateMutability": "nonpayable", "type": "function" } ], "metadata": "{\"compiler\":{\"version\":\"0.6.10+commit.00c0fcaf\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_factory\",\"type\":\"address\"}],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"inputs\":[],\"name\":\"PERIOD\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_tokenIn\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_amountIn\",\"type\":\"uint256\"},{\"internalType\":\"address\",\"name\":\"_tokenOut\",\"type\":\"address\"}],\"name\":\"consult\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"_amountOut\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"factory\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_tokenIn\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"_tokenOut\",\"type\":\"address\"}],\"name\":\"update\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_tokenIn\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_amountIn\",\"type\":\"uint256\"},{\"internalType\":\"address\",\"name\":\"_tokenOut\",\"type\":\"address\"}],\"name\":\"updateAndConsult\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"_amountOut\",\"type\":\"uint256\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"methods\":{\"update(address,address)\":{\"details\":\"For the first 24 hours the rate will be 0.\"}}},\"userdoc\":{\"methods\":{\"consult(address,uint256,address)\":{\"notice\":\"Returns the rate after `update` has been called.\"},\"update(address,address)\":{\"notice\":\"Updates and stores the exchange rate\"},\"updateAndConsult(address,uint256,address)\":{\"notice\":\"Calls `update` and returns the rate in a single call\"}}}},\"settings\":{\"compilationTarget\":{\"project:/contracts/protocols/Uniswap/UniswapOracle.sol\":\"UniswapOracle\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":2000000},\"remappings\":[]},\"sources\":{\"@openzeppelin/contracts/math/SafeMath.sol\":{\"keccak256\":\"0xcc78a17dd88fa5a2edc60c8489e2f405c0913b377216a5b26b35656b2d0dab52\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://526dc85e1f9b9b45830e202568d267d93dde7a4fcccf4ad7798dadcd92304d3c\",\"dweb:/ipfs/QmaoXMB972J3cSDLtBq3xBo4jLwqD2uzXTwujtSPqkYVhR\"]},\"@uniswap/lib/contracts/libraries/Babylonian.sol\":{\"keccak256\":\"0x2799682d733a6ef3aae1dce7dbe2cff5513f0244e4abd07338fe7a45c8fd9733\",\"license\":\"GPL-3.0-or-later\",\"urls\":[\"bzz-raw://332968199300fe6025b9ad8f3d69f252ec2a3a092fa42a0ef7f2d1397f59a7e5\",\"dweb:/ipfs/Qme4wBzDwfHr7zHk8WrCwCpozpt4KHuDQSxfJTDoHL8Pdi\"]},\"@uniswap/lib/contracts/libraries/BitMath.sol\":{\"keccak256\":\"0x0ef2d7cd41b3f1818fa41019b38948489238efccebe428d4b04919174378abf5\",\"license\":\"GPL-3.0-or-later\",\"urls\":[\"bzz-raw://696ac37d8731506cbac9b428afb7bdfa35a490df139022be2b04ab3815113cf4\",\"dweb:/ipfs/QmUQ5ty49YATw4Gf5PrtFkxNErcnwhNUpRF3WFaVJxATf9\"]},\"@uniswap/lib/contracts/libraries/FixedPoint.sol\":{\"keccak256\":\"0x0e8d7f2bfad7505f9d029ea060eab9747363d50bf01f2d954bf719da6fac342f\",\"license\":\"GPL-3.0-or-later\",\"urls\":[\"bzz-raw://35dd605e2fd59d2606529ab1575cd937082018cd041cfbb843b68e97e440b9b0\",\"dweb:/ipfs/QmUHbzyCdzwUSCUPVFFm9N6oKXiisVdscX8H73nwNXmmpV\"]},\"@uniswap/lib/contracts/libraries/FullMath.sol\":{\"keccak256\":\"0xf3dd7fc13a7eee86c17cdfe13b03a7f24ebaf09588550b64b581ae7b2bd59273\",\"license\":\"CC-BY-4.0\",\"urls\":[\"bzz-raw://492ced3afa929c790c9b1314b86454a977528e8f3d408a55b1275a396154d097\",\"dweb:/ipfs/QmbX2YAgtoM13Z2MRnV5WnUpzmw3fMxmhzCnsKKxQUjGJJ\"]},\"@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol\":{\"keccak256\":\"0xe5905c0989cf5a865ed9bb7b9252536ca011c5b744017a82a7d4443b9c00a891\",\"urls\":[\"bzz-raw://5d2a90a0a796491507462a3da18c3f8819721d571572d765a2207c35bf0a0389\",\"dweb:/ipfs/Qmf9ACYiT3qzjgsYuhm866FBdiBpRMXAPpQhSFbgqcyhHt\"]},\"@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol\":{\"keccak256\":\"0x7c9bc70e5996c763e02ff38905282bc24fb242b0ef2519a003b36824fc524a4b\",\"urls\":[\"bzz-raw://85d5ad2dd23ee127f40907a12865a1e8cb5828814f6f2480285e1827dd72dedf\",\"dweb:/ipfs/QmayKQWJgWmr46DqWseADyUanmqxh662hPNdAkdHRjiQQH\"]},\"@uniswap/v2-periphery/contracts/libraries/UniswapV2OracleLibrary.sol\":{\"keccak256\":\"0x993538630a9568290c39140d54c034a66cf1b95cdeef4ba804a948c4ee2fc311\",\"urls\":[\"bzz-raw://adff017b539750d5ac84403360967c4d6b02a1ee9b8f2487f0bcddd7fa7c523e\",\"dweb:/ipfs/QmQqUiUvoezf33f2SZa64M8KgksHSXFPrGuwDvxijtXYMo\"]},\"project:/contracts/protocols/Uniswap/IUniswapOracle.sol\":{\"keccak256\":\"0x05b6d798d77c056327991f472b01b7cba705b0136da35e6ab7253029f08d147a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://e2e55aca59c764faafc065bc48086dbb53afbfc02f47c76aebaadd730c635507\",\"dweb:/ipfs/QmeGfMkeibFNkM1ewT5LutvF1Z9XvfCVPSgVz6FTiKNfqG\"]},\"project:/contracts/protocols/Uniswap/UniswapOracle.sol\":{\"keccak256\":\"0xed121ed35d335a397fba79e7dc0d63fc8aca5815a94ab6bd86a2faa07814c590\",\"license\":\"GPL-3.0\",\"urls\":[\"bzz-raw://86cc1f263514f7bcaf6a511eb571667252821f25ae5f099403c25375cd38cb9d\",\"dweb:/ipfs/QmYn2upw6fQJkq3rFD2nC8YvXPjrZfKwPadtMNYJ2aaZWe\"]},\"project:/contracts/protocols/Uniswap/UniswapV2Library.sol\":{\"keccak256\":\"0x65165b942a31dbf2bbd457075244dc8de9914d1b242568a26e310e12d824e8b9\",\"license\":\"GPL-3.0\",\"urls\":[\"bzz-raw://8e2724628228ef70e3df52f2fa11a3f6825ff9427af700988d051f3d7dad740c\",\"dweb:/ipfs/QmUo6akdzoDwSdtrbVB75BGAA9qE2KCuURVrisTTHiWnCY\"]}},\"version\":1}", 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"source": "\n// SPDX-License-Identifier: GPL-3.0\n// Original source: https://github.com/Uniswap/uniswap-v2-periphery/blob/master/contracts/examples\n// Modified to unpin solidity version and to support multiple pairs\npragma solidity ^0.6.6;\n\nimport '@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol';\nimport '@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol';\nimport '@uniswap/lib/contracts/libraries/FixedPoint.sol';\nimport '@openzeppelin/contracts/math/SafeMath.sol';\nimport '@uniswap/v2-periphery/contracts/libraries/UniswapV2OracleLibrary.sol';\nimport './UniswapV2Library.sol';\nimport './IUniswapOracle.sol';\n\ncontract UniswapOracle is IUniswapOracle\n{ \n using FixedPoint for *;\n\n struct Observation\n {\n uint timestamp;\n uint price0Cumulative;\n uint price1Cumulative;\n FixedPoint.uq112x112 price0Average;\n FixedPoint.uq112x112 price1Average;\n }\n\n uint public override constant PERIOD = 24 hours;\n address public override immutable factory;\n // mapping from pair address to a list of price observations of that pair\n mapping(address => Observation) private pairObservations;\n \n constructor(\n address _factory\n ) public\n {\n factory = _factory;\n }\n\n /**\n * @notice Updates and stores the exchange rate\n * @dev For the first 24 hours the rate will be 0.\n */\n function update(\n address _tokenIn,\n address _tokenOut\n ) public override\n {\n address pair = UniswapV2Library.pairFor(factory, _tokenIn, _tokenOut);\n Observation storage observation = pairObservations[pair];\n (uint price0Cumulative, uint price1Cumulative, uint32 blockTimestamp) =\n UniswapV2OracleLibrary.currentCumulativePrices(address(pair));\n uint32 timeElapsed = uint32(blockTimestamp - observation.timestamp); // overflow is desired\n\n // ensure that at least one full period has passed since the last update\n if(timeElapsed >= PERIOD)\n {\n if(observation.price0Cumulative > 0)\n {\n // overflow is desired, casting never truncates\n // cumulative price is in (uq112x112 price * seconds) units so we simply wrap it after division by time elapsed\n observation.price0Average = FixedPoint.uq112x112(uint224((price0Cumulative - observation.price0Cumulative) / timeElapsed));\n observation.price1Average = FixedPoint.uq112x112(uint224((price1Cumulative - observation.price1Cumulative) / timeElapsed));\n }\n observation.price0Cumulative = price0Cumulative;\n observation.price1Cumulative = price1Cumulative;\n observation.timestamp = blockTimestamp;\n }\n }\n\n /**\n * @notice Returns the rate after `update` has been called.\n */\n function consult(\n address _tokenIn,\n uint _amountIn,\n address _tokenOut\n ) public override view\n returns (uint _amountOut)\n {\n address pair = UniswapV2Library.pairFor(factory, _tokenIn, _tokenOut);\n Observation storage observation = pairObservations[pair];\n (address token0,) = UniswapV2Library.sortTokens(_tokenIn, _tokenOut);\n if (_tokenIn == token0)\n {\n _amountOut = observation.price0Average.mul(_amountIn).decode144();\n }\n else\n {\n _amountOut = observation.price1Average.mul(_amountIn).decode144();\n }\n }\n \n /**\n * @notice Calls `update` and returns the rate in a single call\n */\n function updateAndConsult(\n address _tokenIn,\n uint _amountIn,\n address _tokenOut\n ) public override\n returns (uint _amountOut)\n {\n update(_tokenIn, _tokenOut);\n return consult(_tokenIn, _amountIn, _tokenOut);\n }\n}", "sourcePath": "/home/circleci/repo/contracts/protocols/Uniswap/UniswapOracle.sol", "ast": { "absolutePath": "project:/contracts/protocols/Uniswap/UniswapOracle.sol", "exportedSymbols": { "UniswapOracle": [ 3157 ] }, "id": 3158, "license": "GPL-3.0", "nodeType": "SourceUnit", "nodes": [ { "id": 2911, "literals": [ "solidity", "^", "0.6", ".6" ], "nodeType": "PragmaDirective", "src": "204:23:14" }, { "absolutePath": "@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol", "file": "@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol", "id": 2912, "nodeType": "ImportDirective", "scope": 3158, "sourceUnit": 1443, "src": "229:69:14", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol", "file": "@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol", "id": 2913, "nodeType": "ImportDirective", "scope": 3158, "sourceUnit": 1685, "src": "299:66:14", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@uniswap/lib/contracts/libraries/FixedPoint.sol", "file": "@uniswap/lib/contracts/libraries/FixedPoint.sol", "id": 2914, "nodeType": "ImportDirective", "scope": 3158, "sourceUnit": 1167, "src": "366:57:14", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/math/SafeMath.sol", "file": "@openzeppelin/contracts/math/SafeMath.sol", "id": 2915, "nodeType": "ImportDirective", "scope": 3158, "sourceUnit": 355, "src": "424:51:14", "symbolAliases": [], "unitAlias": "" 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"isLValue": true, "isPure": false, "lValueRequested": true, "memberName": "timestamp", "nodeType": "MemberAccess", "referencedDeclaration": 2924, "src": "2499:21:14", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "id": 3062, "name": "blockTimestamp", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2983, "src": "2523:14:14", "typeDescriptions": { "typeIdentifier": "t_uint32", "typeString": "uint32" } }, "src": "2499:38:14", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3064, "nodeType": "ExpressionStatement", "src": "2499:38:14" } ] } } ] }, "documentation": { "id": 2955, "nodeType": "StructuredDocumentation", "src": "1192:112:14", "text": " @notice Updates and stores the exchange rate\n @dev For the first 24 hours the rate will be 0." }, "functionSelector": "c640752d", "id": 3068, 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"UserDefinedTypeName", "referencedDeclaration": 2933, "src": "2846:11:14", "typeDescriptions": { "typeIdentifier": "t_struct$_Observation_$2933_storage_ptr", "typeString": "struct UniswapOracle.Observation" } }, "value": null, "visibility": "internal" } ], "id": 3095, "initialValue": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 3092, "name": "pairObservations", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2944, "src": "2880:16:14", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_struct$_Observation_$2933_storage_$", "typeString": "mapping(address => struct UniswapOracle.Observation storage ref)" } }, "id": 3094, "indexExpression": { "argumentTypes": null, "id": 3093, "name": "pair", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3082, "src": "2897:4:14", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "2880:22:14", "typeDescriptions": { "typeIdentifier": "t_struct$_Observation_$2933_storage", "typeString": "struct UniswapOracle.Observation storage ref" } }, "nodeType": "VariableDeclarationStatement", "src": "2846:56:14" }, { "assignments": [ 3097, null ], "declarations": [ { "constant": false, "id": 3097, "mutability": "mutable", "name": "token0", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3130, "src": "2909:14:14", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3096, "name": "address", "nodeType": "ElementaryTypeName", "src": "2909:7:14", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, null ], "id": 3103, "initialValue": { "argumentTypes": null, "arguments": [ { 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