@valueswap/v2-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\":\"0.6.6+commit.6c089d02\"},\"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\":{\"methods\":{}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"/Users/second/Documents/work/valueswap-v2-periphery/contracts/examples/ExampleSlidingWindowOracle.sol\":\"ExampleSlidingWindowOracle\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":999999},\"remappings\":[]},\"sources\":{\"/Users/second/Documents/work/valueswap-v2-periphery/contracts/examples/ExampleSlidingWindowOracle.sol\":{\"keccak256\":\"0x4bb51c1e536a781fceed675d3b5730d7fb6cce08349206af9695c8faef86a770\",\"urls\":[\"bzz-raw://1525402b3912ffb33fe9daecd4faa24fb7712c91ac3808a367b19a954c8c1d38\",\"dweb:/ipfs/QmdVokJ6Lc7HaRrEyBwaG6bUkjbbc3ATrFURG2WUpciMUu\"]},\"/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\"]},\"/Users/second/Documents/work/valueswap-v2-periphery/contracts/libraries/ValueswapV2OracleLibrary.sol\":{\"keccak256\":\"0x3a8a56b8e1d867cecffdb0ff2de6e9a293cc132dd9b2fbd54a8e1cd0eb14cf38\",\"urls\":[\"bzz-raw://892355f90888817408635e26a4c9514f1e18f1a57d7fdd492aef676644bde319\",\"dweb:/ipfs/QmNcMiLuFVHdnEgTSMubByZkzVu8hWjchR9SRKQe7j53TQ\"]},\"@valueswap/lib/contracts/libraries/Babylonian.sol\":{\"keccak256\":\"0xeb1c2a281a00f4660775f75ccfa1e51fbe1d75f86aeb9d0d297151ecdb900177\",\"urls\":[\"bzz-raw://68515f0265381bddfb1d1356ea10ce4e5784276fc09f197fcdcedfa5c75cc069\",\"dweb:/ipfs/QmXWVVPnuJwRUAu3Qpu1s7Fyc5WPQxmZPczVEe5cJ5wVHZ\"]},\"@valueswap/lib/contracts/libraries/BitMath.sol\":{\"keccak256\":\"0x19f84d5268286794b44939ec0d85b3c6f59e133f826cdbd9e40112fc94919bb7\",\"urls\":[\"bzz-raw://d21c67ed58cf667d052e141df2fba76c46c159edcc45eb897c908c20c69d2727\",\"dweb:/ipfs/QmUyKz1992wgR8nYAzBuQzjBAKMxLAN3hTgzpYJxusbmVH\"]},\"@valueswap/lib/contracts/libraries/FixedPoint.sol\":{\"keccak256\":\"0xc3a39b8a11715cea45ad9f67f50e4e4c33778c1124acd59e90daf064c9a93974\",\"urls\":[\"bzz-raw://2c6c3cdcdb30caa5d15477550003b5dbb174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"source": "pragma solidity =0.6.6;\n\nimport '@valueswap/v2-core/contracts/interfaces/IValueswapV2Factory.sol';\nimport '@valueswap/v2-core/contracts/interfaces/IValueswapV2Pair.sol';\nimport '@valueswap/lib/contracts/libraries/FixedPoint.sol';\n\nimport '../libraries/SafeMath.sol';\nimport '../libraries/ValueswapV2Library.sol';\nimport '../libraries/ValueswapV2OracleLibrary.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 = ValueswapV2Library.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,) = ValueswapV2OracleLibrary.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 = ValueswapV2Library.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,) = ValueswapV2OracleLibrary.currentCumulativePrices(pair);\n (address token0,) = ValueswapV2Library.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": "/Users/second/Documents/work/valueswap-v2-periphery/contracts/examples/ExampleSlidingWindowOracle.sol", "ast": { "absolutePath": "/Users/second/Documents/work/valueswap-v2-periphery/contracts/examples/ExampleSlidingWindowOracle.sol", "exportedSymbols": { "ExampleSlidingWindowOracle": [ 4649 ] }, "id": 4650, "nodeType": "SourceUnit", "nodes": [ { "id": 4295, "literals": [ "solidity", "=", "0.6", ".6" ], "nodeType": "PragmaDirective", "src": "0:23:6" }, { "absolutePath": "@valueswap/v2-core/contracts/interfaces/IValueswapV2Factory.sol", "file": "@valueswap/v2-core/contracts/interfaces/IValueswapV2Factory.sol", "id": 4296, "nodeType": "ImportDirective", "scope": 4650, "sourceUnit": 9117, "src": "25:73:6", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@valueswap/v2-core/contracts/interfaces/IValueswapV2Pair.sol", "file": 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