@sonicswap/periphery

{ "contractName": "ExampleSlidingWindowOracle", "abi": [ { "inputs": [ { "internalType": "address", "name": "factory_", "type": "address" }, { "internalType": "uint256", "name": "windowSize_", "type": "uint256" }, { "internalType": "uint8", "name": "granularity_", "type": "uint8" } ], "stateMutability": "nonpayable", "type": "constructor" }, { "inputs": [], "name": "factory", "outputs": [ { "internalType": "address", "name": "", "type": "address" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "granularity", "outputs": [ { "internalType": "uint8", "name": "", "type": "uint8" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "", "type": "address" }, { "internalType": "uint256", "name": "", "type": "uint256" } ], "name": "pairObservations", "outputs": [ { "internalType": "uint256", "name": "timestamp", "type": "uint256" }, { "internalType": "uint256", "name": "price0Cumulative", "type": "uint256" }, { "internalType": "uint256", "name": "price1Cumulative", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "periodSize", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "windowSize", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "uint256", "name": "timestamp", "type": "uint256" } ], "name": "observationIndexOf", "outputs": [ { "internalType": "uint8", "name": "index", "type": "uint8" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "tokenA", "type": "address" }, { "internalType": "address", "name": "tokenB", "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" } ], "metadata": "{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"address\",\"name\":\"factory_\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"windowSize_\",\"type\":\"uint256\"},{\"internalType\":\"uint8\",\"name\":\"granularity_\",\"type\":\"uint8\"}],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"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\":[],\"name\":\"granularity\",\"outputs\":[{\"internalType\":\"uint8\",\"name\":\"\",\"type\":\"uint8\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"name\":\"observationIndexOf\",\"outputs\":[{\"internalType\":\"uint8\",\"name\":\"index\",\"type\":\"uint8\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"pairObservations\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"price0Cumulative\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"price1Cumulative\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"periodSize\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"tokenA\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"tokenB\",\"type\":\"address\"}],\"name\":\"update\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"windowSize\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"}],\"devdoc\":{\"kind\":\"dev\",\"methods\":{},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/var/www/Sonic/sonicswap-periphery/contracts/examples/ExampleSlidingWindowOracle.sol\":\"ExampleSlidingWindowOracle\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"/var/www/Sonic/sonicswap-periphery/contracts/examples/ExampleSlidingWindowOracle.sol\":{\"keccak256\":\"0x03fe5a9c0ff36afc247d609f3f33891da1234dc8e6bbe573723fd11a008aefe0\",\"license\":\"GPL-3.0\",\"urls\":[\"bzz-raw://af269faddcc4dbdda710283bc084536d05db727fa30cca598bbfd311b076363c\",\"dweb:/ipfs/QmPASYUJt5CqhBNwFw3PLAvyX5z77kwG3krYzCf4GySJc3\"]},\"/var/www/Sonic/sonicswap-periphery/contracts/libraries/SafeMath.sol\":{\"keccak256\":\"0x97845129a51dbb1869a765595d1c671fa473b97ef800756402afaadc7640a94e\",\"license\":\"GPL-3.0\",\"urls\":[\"bzz-raw://5928803fe14654103d3f15b57b5b8df40b98f58cbe4e7044888f092f2462af04\",\"dweb:/ipfs/QmdnB83EBtNjwoKFHizxsTo6e2ytKN97SCvYnX28p75DCu\"]},\"/var/www/Sonic/sonicswap-periphery/contracts/libraries/UniswapV2Library.sol\":{\"keccak256\":\"0x97bae257510f91855e0f098176f8dbb967702f788492884bca5886dc1d1aec7d\",\"license\":\"GPL-3.0\",\"urls\":[\"bzz-raw://310af80b5807f9ca7b8da55e529f44d41cd2f897511191f40d85d41e351bbeb4\",\"dweb:/ipfs/QmXMrQD79HZXN7JrHqNGYp3AKTSN7Kw8TjwrUw8Z33jFU6\"]},\"/var/www/Sonic/sonicswap-periphery/contracts/libraries/UniswapV2OracleLibrary.sol\":{\"keccak256\":\"0xa41e7d2548091ad9d2a7d41a7d204dc02de4c239918befdc91d38fe86a45c8a3\",\"license\":\"GPL-3.0\",\"urls\":[\"bzz-raw://9b334a4d861aaffed92ad7157e7c272a043ed985f7ebe2054530cec5ac4164dc\",\"dweb:/ipfs/QmcuLSWUDLFXaogTpQNqHavfE1GKDjZHvoWDwcZ5x1eDea\"]},\"@sonicswap/core/contracts/interfaces/IUniswapV2Factory.sol\":{\"keccak256\":\"0xf493893f508c8caa2f5923d1a39080fc5f1f362ea1f1d65ffc38b7782b35c4b7\",\"license\":\"GPL-3.0\",\"urls\":[\"bzz-raw://993a51b20f6d79edb33069524ee3a66378f8687d3df52e279561c4ef72e17cb2\",\"dweb:/ipfs/QmQSmgeRkVyA4jyShZStAWVt1CWNZQ8JvYmc2V2jgEUNEE\"]},\"@sonicswap/core/contracts/interfaces/IUniswapV2Pair.sol\":{\"keccak256\":\"0xa87a1a8e9d72090e25812f396a9c0766a715dda52d8b6115ca0ab3f2a9c10f87\",\"license\":\"GPL-3.0\",\"urls\":[\"bzz-raw://3b179da8f464eaa162ef0f9cfac56989d6fb5aa9667bebd23b355d93ea3ff10b\",\"dweb:/ipfs/QmcgYA55h3VJJRo7fFFNSDDDspdnJVTW83aH657v4E9bGZ\"]},\"@sonicswap/lib/contracts/libraries/Babylonian.sol\":{\"keccak256\":\"0xc2389737a1d4954f93ed88099f8833ccc350a62b8b29b61c2a24f237eb4649bc\",\"license\":\"GPL-3.0-or-later\",\"urls\":[\"bzz-raw://3d95218a6f0c7c5030e1f81aabcfe297449bf8bb92fcac1c4ba9bcfc8d61e62b\",\"dweb:/ipfs/QmXzJQLQfgqCuxL5JGMrKRQf5ziRNvQiQkNK3ZK6Lkn4CR\"]},\"@sonicswap/lib/contracts/libraries/BitMath.sol\":{\"keccak256\":\"0xa4d662f44b982fc9aa6542249aa79b2b07b3e34d5cdaa03720d3d471ac07f5de\",\"license\":\"GPL-3.0-or-later\",\"urls\":[\"bzz-raw://4d40d6c87edb8699d5c5c80344b642a516e0a071f173d393678fee58bbc5fde5\",\"dweb:/ipfs/QmXfp4W5jAdpcsv8VTP8RWsPcmASEtmzF9Xg9xehKK7Xdm\"]},\"@sonicswap/lib/contracts/libraries/FixedPoint.sol\":{\"keccak256\":\"0xba90ab07a7e7870d349fd22dda12b02b78a2b5c0f797de591115cde1ae3e47b0\",\"license\":\"GPL-3.0-or-later\",\"urls\":[\"bzz-raw://b91731ebb4825bcd8512fbf9721d602c298a18392919ddf800f3394231090cb4\",\"dweb:/ipfs/QmUNu1dqnNMyjUeD23KheR1ACVvWmP1T6SmH55Q2kS4nwS\"]},\"@sonicswap/lib/contracts/libraries/FullMath.sol\":{\"keccak256\":\"0x074f43cf798f046118ed21bb9859a7fa1074b9581fe315c8702d6d292fdb2784\",\"license\":\"CC-BY-4.0\",\"urls\":[\"bzz-raw://55a5cb6c5ae9ccc1e6870315bfa5f23f4c758db606f6a292fdff2224fcec082e\",\"dweb:/ipfs/QmRZayK4DWdWHaape9XcVj6VobzX7en7Tejk7gbzv7CHTy\"]}},\"version\":1}", 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"source": "// SPDX-License-Identifier: GPL-3.0\npragma solidity =0.6.12;\n\nimport '@sonicswap/core/contracts/interfaces/IUniswapV2Factory.sol';\nimport '@sonicswap/core/contracts/interfaces/IUniswapV2Pair.sol';\nimport '@sonicswap/lib/contracts/libraries/FixedPoint.sol';\n\nimport '../libraries/SafeMath.sol';\nimport '../libraries/UniswapV2Library.sol';\nimport '../libraries/UniswapV2OracleLibrary.sol';\n\n// sliding window oracle that uses observations collected over a window to provide moving price averages in the past\n// `windowSize` with a precision of `windowSize / granularity`\n// note this is a singleton oracle and only needs to be deployed once per desired parameters, which\n// differs from the simple oracle which must be deployed once per pair.\ncontract ExampleSlidingWindowOracle {\n using FixedPoint for *;\n using SafeMath for uint;\n\n struct Observation {\n uint timestamp;\n uint price0Cumulative;\n uint price1Cumulative;\n }\n\n address public immutable factory;\n // the desired amount of time over which the moving average should be computed, e.g. 24 hours\n uint public immutable windowSize;\n // the number of observations stored for each pair, i.e. how many price observations are stored for the window.\n // as granularity increases from 1, more frequent updates are needed, but moving averages become more precise.\n // averages are computed over intervals with sizes in the range:\n // [windowSize - (windowSize / granularity) * 2, windowSize]\n // e.g. if the window size is 24 hours, and the granularity is 24, the oracle will return the average price for\n // the period:\n // [now - [22 hours, 24 hours], now]\n uint8 public immutable granularity;\n // this is redundant with granularity and windowSize, but stored for gas savings & informational purposes.\n uint public immutable periodSize;\n\n // mapping from pair address to a list of price observations of that pair\n mapping(address => Observation[]) public pairObservations;\n\n constructor(address factory_, uint windowSize_, uint8 granularity_) public {\n require(granularity_ > 1, 'SlidingWindowOracle: GRANULARITY');\n require(\n (periodSize = windowSize_ / granularity_) * granularity_ == windowSize_,\n 'SlidingWindowOracle: WINDOW_NOT_EVENLY_DIVISIBLE'\n );\n factory = factory_;\n windowSize = windowSize_;\n granularity = granularity_;\n }\n\n // returns the index of the observation corresponding to the given timestamp\n function observationIndexOf(uint timestamp) public view returns (uint8 index) {\n uint epochPeriod = timestamp / periodSize;\n return uint8(epochPeriod % granularity);\n }\n\n // returns the observation from the oldest epoch (at the beginning of the window) relative to the current time\n function getFirstObservationInWindow(address pair) private view returns (Observation storage firstObservation) {\n uint8 observationIndex = observationIndexOf(block.timestamp);\n // no overflow issue. if observationIndex + 1 overflows, result is still zero.\n uint8 firstObservationIndex = (observationIndex + 1) % granularity;\n firstObservation = pairObservations[pair][firstObservationIndex];\n }\n\n // update the cumulative price for the observation at the current timestamp. each observation is updated at most\n // once per epoch period.\n function update(address tokenA, address tokenB) external {\n address pair = UniswapV2Library.pairFor(factory, tokenA, tokenB);\n\n // populate the array with empty observations (first call only)\n for (uint i = pairObservations[pair].length; i < granularity; i++) {\n pairObservations[pair].push();\n }\n\n // get the observation for the current period\n uint8 observationIndex = observationIndexOf(block.timestamp);\n Observation storage observation = pairObservations[pair][observationIndex];\n\n // we only want to commit updates once per period (i.e. windowSize / granularity)\n uint timeElapsed = block.timestamp - observation.timestamp;\n if (timeElapsed > periodSize) {\n (uint price0Cumulative, uint price1Cumulative,) = UniswapV2OracleLibrary.currentCumulativePrices(pair);\n observation.timestamp = block.timestamp;\n observation.price0Cumulative = price0Cumulative;\n observation.price1Cumulative = price1Cumulative;\n }\n }\n\n // given the cumulative prices of the start and end of a period, and the length of the period, compute the average\n // price in terms of how much amount out is received for the amount in\n function computeAmountOut(\n uint priceCumulativeStart, uint priceCumulativeEnd,\n uint timeElapsed, uint amountIn\n ) private pure returns (uint amountOut) {\n // overflow is desired.\n FixedPoint.uq112x112 memory priceAverage = FixedPoint.uq112x112(\n uint224((priceCumulativeEnd - priceCumulativeStart) / timeElapsed)\n );\n amountOut = priceAverage.mul(amountIn).decode144();\n }\n\n // returns the amount out corresponding to the amount in for a given token using the moving average over the time\n // range [now - [windowSize, windowSize - periodSize * 2], now]\n // update must have been called for the bucket corresponding to timestamp `now - windowSize`\n function consult(address tokenIn, uint amountIn, address tokenOut) external view returns (uint amountOut) {\n address pair = UniswapV2Library.pairFor(factory, tokenIn, tokenOut);\n Observation storage firstObservation = getFirstObservationInWindow(pair);\n\n uint timeElapsed = block.timestamp - firstObservation.timestamp;\n require(timeElapsed <= windowSize, 'SlidingWindowOracle: MISSING_HISTORICAL_OBSERVATION');\n // should never happen.\n require(timeElapsed >= windowSize - periodSize * 2, 'SlidingWindowOracle: UNEXPECTED_TIME_ELAPSED');\n\n (uint price0Cumulative, uint price1Cumulative,) = UniswapV2OracleLibrary.currentCumulativePrices(pair);\n (address token0,) = UniswapV2Library.sortTokens(tokenIn, tokenOut);\n\n if (token0 == tokenIn) {\n return computeAmountOut(firstObservation.price0Cumulative, price0Cumulative, timeElapsed, amountIn);\n } else {\n return computeAmountOut(firstObservation.price1Cumulative, price1Cumulative, timeElapsed, amountIn);\n }\n }\n}\n", "sourcePath": "/var/www/Sonic/sonicswap-periphery/contracts/examples/ExampleSlidingWindowOracle.sol", "ast": { "absolutePath": "/var/www/Sonic/sonicswap-periphery/contracts/examples/ExampleSlidingWindowOracle.sol", "exportedSymbols": { "ExampleSlidingWindowOracle": [ 4751 ] }, "id": 4752, "license": "GPL-3.0", "nodeType": "SourceUnit", "nodes": [ { "id": 4397, "literals": [ "solidity", "=", "0.6", ".12" ], "nodeType": "PragmaDirective", "src": "36:24:6" }, { "absolutePath": "@sonicswap/core/contracts/interfaces/IUniswapV2Factory.sol", "file": "@sonicswap/core/contracts/interfaces/IUniswapV2Factory.sol", "id": 4398, "nodeType": "ImportDirective", "scope": 4752, "sourceUnit": 8112, "src": "62:68:6", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@sonicswap/core/contracts/interfaces/IUniswapV2Pair.sol", "file": "@sonicswap/core/contracts/interfaces/IUniswapV2Pair.sol", "id": 4399, "nodeType": "ImportDirective", "scope": 4752, "sourceUnit": 8354, "src": "131:65:6", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@sonicswap/lib/contracts/libraries/FixedPoint.sol", "file": "@sonicswap/lib/contracts/libraries/FixedPoint.sol", "id": 4400, "nodeType": "ImportDirective", "scope": 4752, "sourceUnit": 9464, "src": "197:59:6", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/var/www/Sonic/sonicswap-periphery/contracts/libraries/SafeMath.sol", "file": "../libraries/SafeMath.sol", "id": 4401, "nodeType": "ImportDirective", "scope": 4752, "sourceUnit": 5609, "src": "258:35:6", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/var/www/Sonic/sonicswap-periphery/contracts/libraries/UniswapV2Library.sol", "file": "../libraries/UniswapV2Library.sol", "id": 4402, "nodeType": "ImportDirective", "scope": 4752, "sourceUnit": 6081, "src": "294:43:6", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/var/www/Sonic/sonicswap-periphery/contracts/libraries/UniswapV2OracleLibrary.sol", "file": "../libraries/UniswapV2OracleLibrary.sol", "id": 4403, "nodeType": "ImportDirective", "scope": 4752, "sourceUnit": 6654, "src": "338:49:6", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "contract", "documentation": null, "fullyImplemented": true, "id": 4751, "linearizedBaseContracts": [ 4751 ], "name": "ExampleSlidingWindowOracle", "nodeType": "ContractDefinition", "nodes": [ { "id": 4405, "libraryName": { "contractScope": null, "id": 4404, "name": "FixedPoint", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 9463, "src": "789:10:6", "typeDescriptions": { "typeIdentifier": "t_contract$_FixedPoint_$9463", "typeString": "library FixedPoint" } }, "nodeType": "UsingForDirective", "src": "783:23:6", "typeName": null }, { "id": 4408, "libraryName": { "contractScope": null, "id": 4406, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 5608, "src": "817:8:6", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$5608", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "811:24:6", "typeName": { "id": 4407, "name": "uint", "nodeType": "ElementaryTypeName", "src": "830:4:6", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "canonicalName": "ExampleSlidingWindowOracle.Observation", "id": 4415, "members": [ { "constant": false, "id": 4410, "mutability": "mutable", "name": "timestamp", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4415, "src": "870:14:6", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 4409, "name": "uint", "nodeType": "ElementaryTypeName", "src": "870:4:6", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 4412, "mutability": "mutable", "name": "price0Cumulative", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4415, "src": "894:21:6", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 4411, "name": "uint", "nodeType": "ElementaryTypeName", "src": "894:4:6", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 4414, "mutability": "mutable", "name": "price1Cumulative", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4415, "src": "925:21:6", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 4413, "name": "uint", "nodeType": "ElementaryTypeName", "src": "925:4:6", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "name": "Observation", "nodeType": "StructDefinition", "scope": 4751, "src": "841:112:6", "visibility": "public" }, { "constant": false, "functionSelector": "c45a0155", "id": 4417, "mutability": "immutable", "name": "factory", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4751, "src": "959:32:6", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 4416, "name": "address", "nodeType": "ElementaryTypeName", "src": "959:7:6", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "public" }, { "constant": false, "functionSelector": "8a14117a", "id": 4419, "mutability": "immutable", "name": "windowSize", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4751, "src": "1095:32:6", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 4418, "name": "uint", "nodeType": "ElementaryTypeName", "src": "1095:4:6", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "public" }, { "constant