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PriceCalculatorBSC.sol

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// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

pragma experimental ABIEncoderV2;

___ _ _

| _ )_ _ _ _ _ _ _ _ | | | |

| _ \ || | ' \| ' \ || | |_| |_|

|___/\_,_|_||_|_||_\_, | (_) (_)

|__/

* MIT License

* ===========

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

* The above copyright notice and this permission notice shall be included in all

* copies or substantial portions of the Software.

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

import "@pancakeswap/pancake-swap-lib/contracts/token/BEP20/IBEP20.sol";

import "@pancakeswap/pancake-swap-lib/contracts/math/SafeMath.sol";

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

import "../../interfaces/IPancakePair.sol";

import "../../interfaces/IPancakeFactory.sol";

import "../../interfaces/AggregatorV3Interface.sol";

import "../../interfaces/IPriceCalculator.sol";

import "../../library/HomoraMath.sol";

contract PriceCalculatorBSC is IPriceCalculator, OwnableUpgradeable {

using SafeMath for uint;

using HomoraMath for uint;

address public constant WBNB = 0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c;

address public constant CAKE = 0x0E09FaBB73Bd3Ade0a17ECC321fD13a19e81cE82;

address public constant BUNNY = 0xC9849E6fdB743d08fAeE3E34dd2D1bc69EA11a51;

address public constant VAI = 0x4BD17003473389A42DAF6a0a729f6Fdb328BbBd7;

address public constant BUSD = 0xe9e7CEA3DedcA5984780Bafc599bD69ADd087D56;

address public constant BUNNY_BNB_V1 = 0x7Bb89460599Dbf32ee3Aa50798BBcEae2A5F7f6a;

address public constant BUNNY_BNB_V2 = 0x5aFEf8567414F29f0f927A0F2787b188624c10E2;

IPancakeFactory private constant factory = IPancakeFactory(0xcA143Ce32Fe78f1f7019d7d551a6402fC5350c73);

AggregatorV3Interface private constant bnbPriceFeed = AggregatorV3Interface(0x0567F2323251f0Aab15c8dFb1967E4e8A7D42aeE);

/* ========== STATE VARIABLES ========== */

mapping(address => address) private pairTokens;

mapping(address => address) private tokenFeeds;

/* ========== INITIALIZER ========== */

function initialize() external initializer {

__Ownable_init();

setPairToken(VAI, BUSD);

}

/* ========== Restricted Operation ========== */

function setPairToken(address asset, address pairToken) public onlyOwner {

pairTokens[asset] = pairToken;

}

function setTokenFeed(address asset, address feed) public onlyOwner {

tokenFeeds[asset] = feed;

}

/* ========== Value Calculation ========== */

function priceOfBNB() view public returns (uint) {

(, int price, , ,) = bnbPriceFeed.latestRoundData();

(, int price, , ,) = AggregatorV3Interface(tokenFeeds[WBNB]).latestRoundData();

return uint(price).mul(1e10);

}

function priceOfCake() view public returns (uint) {

(, uint cakePriceInUSD) = valueOfAsset(CAKE, 1e18);

(, int price, , ,) = AggregatorV3Interface(tokenFeeds[CAKE]).latestRoundData();

return cakePriceInUSD;

return uint(price).mul(1e10);

}

function priceOfBunny() view public returns (uint) {

(, uint bunnyPriceInUSD) = valueOfAsset(BUNNY, 1e18);

return bunnyPriceInUSD;

}

function pricesInUSD(address[] memory assets) public view override returns (uint[] memory) {

uint[] memory prices = new uint[](assets.length);

for (uint i = 0; i < assets.length; i++) {

(, uint valueInUSD) = valueOfAsset(assets[i], 1e18);

prices[i] = valueInUSD;

}

return prices;

}

function valueOfAsset(address asset, uint amount) public view override returns (uint valueInBNB, uint valueInUSD) {

if (asset == address(0) || asset == WBNB) {

return _oracleValueOf(WBNB, amount);

} else if (asset == BUNNY || asset == BUNNY_BNB_V1 || asset == BUNNY_BNB_V2) {

return _unsafeValueOfAsset(asset, amount);

} else if (keccak256(abi.encodePacked(IPancakePair(asset).symbol())) == keccak256("Cake-LP")) {

return _getPairPrice(asset, amount);

} else {

return _oracleValueOf(asset, amount);

}

function _oracleValueOf(address asset, uint amount) private view returns (uint valueInBNB, uint valueInUSD) {

(, int price, , ,) = AggregatorV3Interface(tokenFeeds[asset]).latestRoundData();

valueInUSD = uint(price).mul(1e10).mul(amount).div(1e18);

valueInBNB = valueInUSD.mul(1e18).div(priceOfBNB());

}

function _getPairPrice(address pair, uint amount) private view returns (uint valueInBNB, uint valueInUSD) {

address token0 = IPancakePair(pair).token0();

address token1 = IPancakePair(pair).token1();

uint totalSupply = IPancakePair(pair).totalSupply();

(uint r0, uint r1, ) = IPancakePair(pair).getReserves();

uint sqrtK = HomoraMath.sqrt(r0.mul(r1)).fdiv(totalSupply);

(uint px0,) = _oracleValueOf(token0, 1e18);

(uint px1,) = _oracleValueOf(token1, 1e18);

uint fairPriceInBNB = sqrtK.mul(2).mul(HomoraMath.sqrt(px0)).div(2**56).mul(HomoraMath.sqrt(px1)).div(2**56);

valueInBNB = fairPriceInBNB.mul(amount).div(1e18);

valueInUSD = valueInBNB.mul(priceOfBNB()).div(1e18);

}

function _unsafeValueOfAsset(address asset, uint amount) private view returns (uint valueInBNB, uint valueInUSD) {

if (asset == address(0) || asset == WBNB) {

valueInBNB = amount;

valueInUSD = amount.mul(priceOfBNB()).div(1e18);

}

else if (keccak256(abi.encodePacked(IPancakePair(asset).symbol())) == keccak256("Cake-LP")) {

if (IPancakePair(asset).totalSupply() == 0) return (0, 0);

(uint reserve0, uint reserve1, ) = IPancakePair(asset).getReserves();

if (IPancakePair(asset).token0() == WBNB) {

valueInBNB = amount.mul(reserve0).mul(2).div(IPancakePair(asset).totalSupply());

valueInUSD = valueInBNB.mul(priceOfBNB()).div(1e18);

} else if (IPancakePair(asset).token1() == WBNB) {

valueInBNB = amount.mul(reserve1).mul(2).div(IPancakePair(asset).totalSupply());

valueInUSD = valueInBNB.mul(priceOfBNB()).div(1e18);

} else {

(uint token0PriceInBNB,) = valueOfAsset(IPancakePair(asset).token0(), 1e18);

valueInBNB = amount.mul(reserve0).mul(2).mul(token0PriceInBNB).div(1e18).div(IPancakePair(asset).totalSupply());

valueInUSD = valueInBNB.mul(priceOfBNB()).div(1e18);

}

else {

address pairToken = pairTokens[asset] == address(0) ? WBNB : pairTokens[asset];

address pair = factory.getPair(asset, pairToken);

if (IBEP20(asset).balanceOf(pair) == 0) return (0, 0);

(uint reserve0, uint reserve1, ) = IPancakePair(pair).getReserves();

if (IPancakePair(pair).token0() == pairToken) {

valueInBNB = reserve0.mul(amount).div(reserve1);

} else if (IPancakePair(pair).token1() == pairToken) {

valueInBNB = reserve1.mul(amount).div(reserve0);

} else {

return (0, 0);

}

if (pairToken != WBNB) {

(uint pairValueInBNB,) = valueOfAsset(pairToken, 1e18);

valueInBNB = valueInBNB.mul(pairValueInBNB).div(1e18);

}

valueInUSD = valueInBNB.mul(priceOfBNB()).div(1e18);

}

Saved diffs

Original text

Open file

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

/*
  ___                      _   _
 | _ )_  _ _ _  _ _ _  _  | | | |
 | _ \ || | ' \| ' \ || | |_| |_|
 |___/\_,_|_||_|_||_\_, | (_) (_)
                    |__/

*
* MIT License
* ===========
*
* Copyright (c) 2020 BunnyFinance
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/

import "@pancakeswap/pancake-swap-lib/contracts/token/BEP20/IBEP20.sol";
import "@pancakeswap/pancake-swap-lib/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

import "../../interfaces/IPancakePair.sol";
import "../../interfaces/IPancakeFactory.sol";
import "../../interfaces/AggregatorV3Interface.sol";
import "../../interfaces/IPriceCalculator.sol";

contract PriceCalculatorBSC is IPriceCalculator, OwnableUpgradeable {
    using SafeMath for uint;

address public constant WBNB = 0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c;
    address public constant CAKE = 0x0E09FaBB73Bd3Ade0a17ECC321fD13a19e81cE82;
    address public constant BUNNY = 0xC9849E6fdB743d08fAeE3E34dd2D1bc69EA11a51;
    address public constant VAI = 0x4BD17003473389A42DAF6a0a729f6Fdb328BbBd7;
    address public constant BUSD = 0xe9e7CEA3DedcA5984780Bafc599bD69ADd087D56;

IPancakeFactory private constant factory = IPancakeFactory(0xcA143Ce32Fe78f1f7019d7d551a6402fC5350c73);
    AggregatorV3Interface private constant bnbPriceFeed = AggregatorV3Interface(0x0567F2323251f0Aab15c8dFb1967E4e8A7D42aeE);

/* ========== STATE VARIABLES ========== */

mapping(address => address) private pairTokens;

/* ========== INITIALIZER ========== */

function initialize() external initializer {
        __Ownable_init();
        setPairToken(VAI, BUSD);
    }

/* ========== Restricted Operation ========== */

function setPairToken(address asset, address pairToken) public onlyOwner {
        pairTokens[asset] = pairToken;
    }

/* ========== Value Calculation ========== */

function priceOfBNB() view public returns (uint) {
        (, int price, , ,) = bnbPriceFeed.latestRoundData();
        return uint(price).mul(1e10);
    }

function priceOfCake() view public returns (uint) {
        (, uint cakePriceInUSD) = valueOfAsset(CAKE, 1e18);
        return cakePriceInUSD;
    }

function priceOfBunny() view public returns (uint) {
        (, uint bunnyPriceInUSD) = valueOfAsset(BUNNY, 1e18);
        return bunnyPriceInUSD;
    }

function pricesInUSD(address[] memory assets) public view override returns (uint[] memory) {
        uint[] memory prices = new uint[](assets.length);
        for (uint i = 0; i < assets.length; i++) {
            (, uint valueInUSD) = valueOfAsset(assets[i], 1e18);
            prices[i] = valueInUSD;
        }
        return prices;
    }

function valueOfAsset(address asset, uint amount) public view override returns (uint valueInBNB, uint valueInUSD) {
        if (asset == address(0) || asset == WBNB) {
            valueInBNB = amount;
            valueInUSD = amount.mul(priceOfBNB()).div(1e18);
        }
        else if (keccak256(abi.encodePacked(IPancakePair(asset).symbol())) == keccak256("Cake-LP")) {
            if (IPancakePair(asset).totalSupply() == 0) return (0, 0);

(uint reserve0, uint reserve1, ) = IPancakePair(asset).getReserves();
            if (IPancakePair(asset).token0() == WBNB) {
                valueInBNB = amount.mul(reserve0).mul(2).div(IPancakePair(asset).totalSupply());
                valueInUSD = valueInBNB.mul(priceOfBNB()).div(1e18);
            } else if (IPancakePair(asset).token1() == WBNB) {
                valueInBNB = amount.mul(reserve1).mul(2).div(IPancakePair(asset).totalSupply());
                valueInUSD = valueInBNB.mul(priceOfBNB()).div(1e18);
            } else {
                (uint token0PriceInBNB,) = valueOfAsset(IPancakePair(asset).token0(), 1e18);
                valueInBNB = amount.mul(reserve0).mul(2).mul(token0PriceInBNB).div(1e18).div(IPancakePair(asset).totalSupply());
                valueInUSD = valueInBNB.mul(priceOfBNB()).div(1e18);
            }
        }
        else {
            address pairToken = pairTokens[asset] == address(0) ? WBNB : pairTokens[asset];
            address pair = factory.getPair(asset, pairToken);
            if (IBEP20(asset).balanceOf(pair) == 0) return (0, 0);

(uint reserve0, uint reserve1, ) = IPancakePair(pair).getReserves();
            if (IPancakePair(pair).token0() == pairToken) {
                valueInBNB = reserve0.mul(amount).div(reserve1);
            } else if (IPancakePair(pair).token1() == pairToken) {
                valueInBNB = reserve1.mul(amount).div(reserve0);
            } else {
                return (0, 0);
            }

if (pairToken != WBNB) {
                (uint pairValueInBNB,) = valueOfAsset(pairToken, 1e18);
                valueInBNB = valueInBNB.mul(pairValueInBNB).div(1e18);
            }
            valueInUSD = valueInBNB.mul(priceOfBNB()).div(1e18);
        }
    }
}

Changed text

Open file

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

/*
  ___                      _   _
 | _ )_  _ _ _  _ _ _  _  | | | |
 | _ \ || | ' \| ' \ || | |_| |_|
 |___/\_,_|_||_|_||_\_, | (_) (_)
                    |__/

import "@pancakeswap/pancake-swap-lib/contracts/token/BEP20/IBEP20.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

import "../../interfaces/IPancakePair.sol";
import "../../interfaces/IPancakeFactory.sol";
import "../../interfaces/AggregatorV3Interface.sol";
import "../../interfaces/IPriceCalculator.sol";
import "../../library/HomoraMath.sol";

contract PriceCalculatorBSC is IPriceCalculator, OwnableUpgradeable {
    using SafeMath for uint;
    using HomoraMath for uint;

address public constant BUNNY_BNB_V1 = 0x7Bb89460599Dbf32ee3Aa50798BBcEae2A5F7f6a;
    address public constant BUNNY_BNB_V2 = 0x5aFEf8567414F29f0f927A0F2787b188624c10E2;

IPancakeFactory private constant factory = IPancakeFactory(0xcA143Ce32Fe78f1f7019d7d551a6402fC5350c73);

/* ========== STATE VARIABLES ========== */

mapping(address => address) private pairTokens;
    mapping(address => address) private tokenFeeds;

/* ========== INITIALIZER ========== */

function initialize() external initializer {
        __Ownable_init();
        setPairToken(VAI, BUSD);
    }

/* ========== Restricted Operation ========== */

function setPairToken(address asset, address pairToken) public onlyOwner {
        pairTokens[asset] = pairToken;
    }

function setTokenFeed(address asset, address feed) public onlyOwner {
        tokenFeeds[asset] = feed;
    }

/* ========== Value Calculation ========== */

function priceOfBNB() view public returns (uint) {
        (, int price, , ,) = AggregatorV3Interface(tokenFeeds[WBNB]).latestRoundData();
        return uint(price).mul(1e10);
    }

function priceOfCake() view public returns (uint) {
        (, int price, , ,) = AggregatorV3Interface(tokenFeeds[CAKE]).latestRoundData();
        return uint(price).mul(1e10);
    }

function priceOfBunny() view public returns (uint) {
        (, uint bunnyPriceInUSD) = valueOfAsset(BUNNY, 1e18);
        return bunnyPriceInUSD;
    }

function _oracleValueOf(address asset, uint amount) private view returns (uint valueInBNB, uint valueInUSD) {
        (, int price, , ,) = AggregatorV3Interface(tokenFeeds[asset]).latestRoundData();
        valueInUSD = uint(price).mul(1e10).mul(amount).div(1e18);
        valueInBNB = valueInUSD.mul(1e18).div(priceOfBNB());
    }

function _getPairPrice(address pair, uint amount) private view returns (uint valueInBNB, uint valueInUSD) {
        address token0 = IPancakePair(pair).token0();
        address token1 = IPancakePair(pair).token1();
        uint totalSupply = IPancakePair(pair).totalSupply();
        (uint r0, uint r1, ) = IPancakePair(pair).getReserves();

uint sqrtK = HomoraMath.sqrt(r0.mul(r1)).fdiv(totalSupply);
        (uint px0,) = _oracleValueOf(token0, 1e18);
        (uint px1,) = _oracleValueOf(token1, 1e18);
        uint fairPriceInBNB = sqrtK.mul(2).mul(HomoraMath.sqrt(px0)).div(2**56).mul(HomoraMath.sqrt(px1)).div(2**56);

valueInBNB = fairPriceInBNB.mul(amount).div(1e18);
        valueInUSD = valueInBNB.mul(priceOfBNB()).div(1e18);
    }

function _unsafeValueOfAsset(address asset, uint amount) private view returns (uint valueInBNB, uint valueInUSD) {
        if (asset == address(0) || asset == WBNB) {
            valueInBNB = amount;
            valueInUSD = amount.mul(priceOfBNB()).div(1e18);
        }
        else if (keccak256(abi.encodePacked(IPancakePair(asset).symbol())) == keccak256("Cake-LP")) {
            if (IPancakePair(asset).totalSupply() == 0) return (0, 0);