@valueswap/v2-periphery/build/ExampleOracleSimple.json

🎚 Peripheral smart contracts for interacting with Valueswap V2

{
  "contractName": "ExampleOracleSimple",
  "abi": [
    {
      "inputs": [
        {
          "internalType": "address",
          "name": "factory",
          "type": "address"
        },
        {
          "internalType": "address",
          "name": "tokenA",
          "type": "address"
        },
        {
          "internalType": "address",
          "name": "tokenB",
          "type": "address"
        }
      ],
      "stateMutability": "nonpayable",
      "type": "constructor"
    },
    {
      "inputs": [],
      "name": "PERIOD",
      "outputs": [
        {
          "internalType": "uint256",
          "name": "",
          "type": "uint256"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "blockTimestampLast",
      "outputs": [
        {
          "internalType": "uint32",
          "name": "",
          "type": "uint32"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "price0Average",
      "outputs": [
        {
          "internalType": "uint224",
          "name": "_x",
          "type": "uint224"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "price0CumulativeLast",
      "outputs": [
        {
          "internalType": "uint256",
          "name": "",
          "type": "uint256"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "price1Average",
      "outputs": [
        {
          "internalType": "uint224",
          "name": "_x",
          "type": "uint224"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "price1CumulativeLast",
      "outputs": [
        {
          "internalType": "uint256",
          "name": "",
          "type": "uint256"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "token0",
      "outputs": [
        {
          "internalType": "address",
          "name": "",
          "type": "address"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "token1",
      "outputs": [
        {
          "internalType": "address",
          "name": "",
          "type": "address"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "update",
      "outputs": [],
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "inputs": [
        {
          "internalType": "address",
          "name": "token",
          "type": "address"
        },
        {
          "internalType": "uint256",
          "name": "amountIn",
          "type": "uint256"
        }
      ],
      "name": "consult",
      "outputs": [
        {
          "internalType": "uint256",
          "name": "amountOut",
          "type": "uint256"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    }
  ],
  "metadata": 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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/ValueswapV2OracleLibrary.sol';\nimport '../libraries/ValueswapV2Library.sol';\n\n// fixed window oracle that recomputes the average price for the entire period once every period\n// note that the price average is only guaranteed to be over at least 1 period, but may be over a longer period\ncontract ExampleOracleSimple {\n    using FixedPoint for *;\n\n    uint public constant PERIOD = 24 hours;\n\n    IValueswapV2Pair immutable pair;\n    address public immutable token0;\n    address public immutable token1;\n\n    uint    public price0CumulativeLast;\n    uint    public price1CumulativeLast;\n    uint32  public blockTimestampLast;\n    FixedPoint.uq112x112 public price0Average;\n    FixedPoint.uq112x112 public price1Average;\n\n    constructor(address factory, address tokenA, address tokenB) public {\n        IValueswapV2Pair _pair = IValueswapV2Pair(ValueswapV2Library.pairFor(factory, tokenA, tokenB));\n        pair = _pair;\n        token0 = _pair.token0();\n        token1 = _pair.token1();\n        price0CumulativeLast = _pair.price0CumulativeLast(); // fetch the current accumulated price value (1 / 0)\n        price1CumulativeLast = _pair.price1CumulativeLast(); // fetch the current accumulated price value (0 / 1)\n        uint112 reserve0;\n        uint112 reserve1;\n        (reserve0, reserve1, blockTimestampLast) = _pair.getReserves();\n        require(reserve0 != 0 && reserve1 != 0, 'ExampleOracleSimple: NO_RESERVES'); // ensure that there's liquidity in the pair\n    }\n\n    function update() external {\n        (uint price0Cumulative, uint price1Cumulative, uint32 blockTimestamp) =\n            ValueswapV2OracleLibrary.currentCumulativePrices(address(pair));\n        uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired\n\n        // ensure that at least one full period has passed since the last update\n        require(timeElapsed >= PERIOD, 'ExampleOracleSimple: PERIOD_NOT_ELAPSED');\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        price0Average = FixedPoint.uq112x112(uint224((price0Cumulative - price0CumulativeLast) / timeElapsed));\n        price1Average = FixedPoint.uq112x112(uint224((price1Cumulative - price1CumulativeLast) / timeElapsed));\n\n        price0CumulativeLast = price0Cumulative;\n        price1CumulativeLast = price1Cumulative;\n        blockTimestampLast = blockTimestamp;\n    }\n\n    // note this will always return 0 before update has been called successfully for the first time.\n    function consult(address token, uint amountIn) external view returns (uint amountOut) {\n        if (token == token0) {\n            amountOut = price0Average.mul(amountIn).decode144();\n        } else {\n            require(token == token1, 'ExampleOracleSimple: INVALID_TOKEN');\n            amountOut = price1Average.mul(amountIn).decode144();\n        }\n    }\n}\n",
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