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December 2, 2021 10:04
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| // SPDX-License-Identifier: MIT | |
| pragma solidity 0.8.7; | |
| import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol"; | |
| /** | |
| * THIS EXAMPLE USES UN-AUDITED CODE. | |
| * Network: Kovan | |
| * Base: BTC/USD | |
| * Base Address: 0x6135b13325bfC4B00278B4abC5e20bbce2D6580e | |
| * Quote: EUR/USD | |
| * Quote Address: 0x0c15Ab9A0DB086e062194c273CC79f41597Bbf13 | |
| * Decimals: 8 | |
| */ | |
| contract PriceConverter { | |
| function getDerivedPrice(address _base, address _quote, uint8 _decimals) | |
| public | |
| view | |
| returns (int256) | |
| { | |
| require(_decimals > uint8(0) && _decimals <= uint8(18), "Invalid _decimals"); | |
| int256 decimals = int256(10 ** uint256(_decimals)); | |
| ( , int256 basePrice, , , ) = AggregatorV3Interface(_base).latestRoundData(); | |
| uint8 baseDecimals = AggregatorV3Interface(_base).decimals(); | |
| basePrice = scalePrice(basePrice, baseDecimals, _decimals); | |
| ( , int256 quotePrice, , , ) = AggregatorV3Interface(_quote).latestRoundData(); | |
| uint8 quoteDecimals = AggregatorV3Interface(_quote).decimals(); | |
| quotePrice = scalePrice(quotePrice, quoteDecimals, _decimals); | |
| return basePrice * decimals / quotePrice; | |
| } | |
| function scalePrice(int256 _price, uint8 _priceDecimals, uint8 _decimals) | |
| internal | |
| pure | |
| returns (int256) | |
| { | |
| if (_priceDecimals < _decimals) { | |
| return _price * int256(10 ** uint256(_decimals - _priceDecimals)); | |
| } else if (_priceDecimals > _decimals) { | |
| return _price / int256(10 ** uint256(_priceDecimals - _decimals)); | |
| } | |
| return _price; | |
| } | |
| } |
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