mirror of
https://github.com/Instadapp/fluid-contracts-public.git
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212 lines
10 KiB
Solidity
212 lines
10 KiB
Solidity
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// SPDX-License-Identifier: BUSL-1.1
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pragma solidity 0.8.21;
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import { ErrorTypes } from "../errorTypes.sol";
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import { IChainlinkAggregatorV3 } from "../interfaces/external/IChainlinkAggregatorV3.sol";
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import { Error as OracleError } from "../error.sol";
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import { OracleUtils } from "../libraries/oracleUtils.sol";
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import { ChainlinkStructs } from "./structs.sol";
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/// @title Chainlink Oracle implementation
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/// @notice This contract is used to get the exchange rate via up to 3 hops at Chainlink price feeds.
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/// The rate is multiplied with the previous rate at each hop.
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/// E.g. to go from wBTC to USDC (assuming rates for example):
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/// 1. wBTC -> BTC https://data.chain.link/ethereum/mainnet/crypto-other/wbtc-btc, rate: 0.92.
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/// 2. BTC -> USD https://data.chain.link/ethereum/mainnet/crypto-usd/btc-usd rate: 30,000.
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/// 3. USD -> USDC https://data.chain.link/ethereum/mainnet/stablecoins/usdc-usd rate: 0.98. Must invert feed: 1.02
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/// finale rate would be: 0.92 * 30,000 * 1.02 = 28,152
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abstract contract ChainlinkOracleImpl is OracleError, ChainlinkStructs {
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/// @notice Chainlink price feed 1 to check for the exchange rate
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IChainlinkAggregatorV3 internal immutable _CHAINLINK_FEED1;
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/// @notice Chainlink price feed 2 to check for the exchange rate
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IChainlinkAggregatorV3 internal immutable _CHAINLINK_FEED2;
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/// @notice Chainlink price feed 3 to check for the exchange rate
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IChainlinkAggregatorV3 internal immutable _CHAINLINK_FEED3;
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/// @notice Flag to invert the price or not for feed 1 (to e.g. for WETH/USDC pool return prive of USDC per 1 WETH)
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bool internal immutable _CHAINLINK_INVERT_RATE1;
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/// @notice Flag to invert the price or not for feed 2 (to e.g. for WETH/USDC pool return prive of USDC per 1 WETH)
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bool internal immutable _CHAINLINK_INVERT_RATE2;
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/// @notice Flag to invert the price or not for feed 3 (to e.g. for WETH/USDC pool return prive of USDC per 1 WETH)
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bool internal immutable _CHAINLINK_INVERT_RATE3;
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/// @notice constant value for price scaling to reduce gas usage for feed 1
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uint256 internal immutable _CHAINLINK_PRICE_SCALER_MULTIPLIER1;
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/// @notice constant value for inverting price to reduce gas usage for feed 1
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uint256 internal immutable _CHAINLINK_INVERT_PRICE_DIVIDEND1;
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/// @notice constant value for price scaling to reduce gas usage for feed 2
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uint256 internal immutable _CHAINLINK_PRICE_SCALER_MULTIPLIER2;
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/// @notice constant value for inverting price to reduce gas usage for feed 2
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uint256 internal immutable _CHAINLINK_INVERT_PRICE_DIVIDEND2;
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/// @notice constant value for price scaling to reduce gas usage for feed 3
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uint256 internal immutable _CHAINLINK_PRICE_SCALER_MULTIPLIER3;
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/// @notice constant value for inverting price to reduce gas usage for feed 3
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uint256 internal immutable _CHAINLINK_INVERT_PRICE_DIVIDEND3;
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/// @notice constructor sets the Chainlink price feed and invertRate flag for each hop.
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/// E.g. `invertRate_` should be true if for the USDC/ETH pool it's expected that the oracle returns USDC per 1 ETH
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constructor(ChainlinkConstructorParams memory params_) {
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if (
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(params_.hops < 1 || params_.hops > 3) || // hops must be 1, 2 or 3
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(address(params_.feed1.feed) == address(0) || params_.feed1.token0Decimals == 0) || // first feed must always be defined
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(params_.hops > 1 && (address(params_.feed2.feed) == address(0) || params_.feed2.token0Decimals == 0)) || // if hops > 1, feed 2 must be defined
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(params_.hops > 2 && (address(params_.feed3.feed) == address(0) || params_.feed3.token0Decimals == 0)) // if hops > 2, feed 3 must be defined
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) {
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revert FluidOracleError(ErrorTypes.ChainlinkOracle__InvalidParams);
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}
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_CHAINLINK_FEED1 = params_.feed1.feed;
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_CHAINLINK_FEED2 = params_.feed2.feed;
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_CHAINLINK_FEED3 = params_.feed3.feed;
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_CHAINLINK_INVERT_RATE1 = params_.feed1.invertRate;
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_CHAINLINK_INVERT_RATE2 = params_.feed2.invertRate;
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_CHAINLINK_INVERT_RATE3 = params_.feed3.invertRate;
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// Actual desired output rate example USDC/ETH (6 decimals / 18 decimals).
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// Note ETH has 12 decimals more than USDC.
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// 0.000515525322211842331991619857165357691 // 39 decimals. ETH for 1 USDC
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// 1954.190000000000433 // 15 decimals. USDC for 1 ETH
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// to get to PRICE_SCLAER_MULTIPLIER and INVERT_PRICE_DIVIDEND:
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// fetched Chainlink price is in token1Decimals per 1 token0Decimals.
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// E.g. for an USDC/ETH price feed it's in ETH 18 decimals.
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// for an BTC/USD price feed it's in USD 8 decimals.
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// So to scale to 1e27 we need to multiply by 1e27 - token0Decimals.
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// E.g. for USDC/ETH it would be: fetchedPrice * 1e21
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//
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// or for inverted (x token0 per 1 token1), formula would be:
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// = 1e27 * 10**token0Decimals / fetchedPrice
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// E.g. for USDC/ETH it would be: 1e33 / fetchedPrice
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// no support for token1Decimals with more than OracleUtils.RATE_OUTPUT_DECIMALS decimals for now as extremely unlikely case
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_CHAINLINK_PRICE_SCALER_MULTIPLIER1 = 10 ** (OracleUtils.RATE_OUTPUT_DECIMALS - params_.feed1.token0Decimals);
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_CHAINLINK_INVERT_PRICE_DIVIDEND1 = 10 ** (OracleUtils.RATE_OUTPUT_DECIMALS + params_.feed1.token0Decimals);
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_CHAINLINK_PRICE_SCALER_MULTIPLIER2 = params_.hops > 1
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? 10 ** (OracleUtils.RATE_OUTPUT_DECIMALS - params_.feed2.token0Decimals)
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: 1;
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_CHAINLINK_INVERT_PRICE_DIVIDEND2 = params_.hops > 1
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? 10 ** (OracleUtils.RATE_OUTPUT_DECIMALS + params_.feed2.token0Decimals)
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: 1;
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_CHAINLINK_PRICE_SCALER_MULTIPLIER3 = params_.hops > 2
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? 10 ** (OracleUtils.RATE_OUTPUT_DECIMALS - params_.feed3.token0Decimals)
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: 1;
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_CHAINLINK_INVERT_PRICE_DIVIDEND3 = params_.hops > 2
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? 10 ** (OracleUtils.RATE_OUTPUT_DECIMALS + params_.feed3.token0Decimals)
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: 1;
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}
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/// @dev Get the exchange rate from Chainlike oracle price feed(s)
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/// @return rate_ The exchange rate in `OracleUtils.RATE_OUTPUT_DECIMALS`
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function _getChainlinkExchangeRate() internal view returns (uint256 rate_) {
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rate_ = _readFeedRate(
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_CHAINLINK_FEED1,
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_CHAINLINK_INVERT_RATE1,
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_CHAINLINK_PRICE_SCALER_MULTIPLIER1,
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_CHAINLINK_INVERT_PRICE_DIVIDEND1
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);
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if (rate_ == 0 || address(_CHAINLINK_FEED2) == address(0)) {
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// rate 0 or only 1 hop -> return rate of price feed 1
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return rate_;
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}
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rate_ =
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(rate_ *
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_readFeedRate(
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_CHAINLINK_FEED2,
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_CHAINLINK_INVERT_RATE2,
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_CHAINLINK_PRICE_SCALER_MULTIPLIER2,
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_CHAINLINK_INVERT_PRICE_DIVIDEND2
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)) /
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(10 ** OracleUtils.RATE_OUTPUT_DECIMALS);
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if (rate_ == 0 || address(_CHAINLINK_FEED3) == address(0)) {
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// rate 0 or 2 hops -> return rate of feed 1 combined with feed 2
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return rate_;
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}
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// 3 hops -> return rate of feed 1 combined with feed 2 & feed 3
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rate_ =
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(rate_ *
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_readFeedRate(
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_CHAINLINK_FEED3,
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_CHAINLINK_INVERT_RATE3,
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_CHAINLINK_PRICE_SCALER_MULTIPLIER3,
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_CHAINLINK_INVERT_PRICE_DIVIDEND3
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)) /
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(10 ** OracleUtils.RATE_OUTPUT_DECIMALS);
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}
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/// @dev reads the exchange `rate_` from a Chainlink price `feed_` taking into account scaling and `invertRate_`
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function _readFeedRate(
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IChainlinkAggregatorV3 feed_,
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bool invertRate_,
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uint256 priceMultiplier_,
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uint256 invertDividend_
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) private view returns (uint256 rate_) {
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try feed_.latestRoundData() returns (uint80, int256 exchangeRate_, uint256, uint256, uint80) {
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// Return the price in `OracleUtils.RATE_OUTPUT_DECIMALS`
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if (invertRate_) {
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return invertDividend_ / uint256(exchangeRate_);
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} else {
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return uint256(exchangeRate_) * priceMultiplier_;
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}
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} catch {
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return 0;
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}
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}
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/// @notice returns all Chainlink oracle related data as utility for easy off-chain use / block explorer in a single view method
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function chainlinkOracleData()
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public
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view
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returns (
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uint256 chainlinkExchangeRate_,
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IChainlinkAggregatorV3 chainlinkFeed1_,
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bool chainlinkInvertRate1_,
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uint256 chainlinkExchangeRate1_,
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IChainlinkAggregatorV3 chainlinkFeed2_,
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bool chainlinkInvertRate2_,
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uint256 chainlinkExchangeRate2_,
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IChainlinkAggregatorV3 chainlinkFeed3_,
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bool chainlinkInvertRate3_,
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uint256 chainlinkExchangeRate3_
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)
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{
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return (
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_getChainlinkExchangeRate(),
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_CHAINLINK_FEED1,
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_CHAINLINK_INVERT_RATE1,
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_readFeedRate(
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_CHAINLINK_FEED1,
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_CHAINLINK_INVERT_RATE1,
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_CHAINLINK_PRICE_SCALER_MULTIPLIER1,
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_CHAINLINK_INVERT_PRICE_DIVIDEND1
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),
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_CHAINLINK_FEED2,
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_CHAINLINK_INVERT_RATE2,
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address(_CHAINLINK_FEED2) == address(0)
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? 0
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: _readFeedRate(
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_CHAINLINK_FEED2,
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_CHAINLINK_INVERT_RATE2,
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_CHAINLINK_PRICE_SCALER_MULTIPLIER2,
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_CHAINLINK_INVERT_PRICE_DIVIDEND2
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),
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_CHAINLINK_FEED3,
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_CHAINLINK_INVERT_RATE3,
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address(_CHAINLINK_FEED3) == address(0)
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? 0
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: _readFeedRate(
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_CHAINLINK_FEED3,
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_CHAINLINK_INVERT_RATE3,
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_CHAINLINK_PRICE_SCALER_MULTIPLIER3,
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_CHAINLINK_INVERT_PRICE_DIVIDEND3
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)
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);
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}
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}
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