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https://github.com/Instadapp/fluid-contracts-public.git
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81 lines
3.8 KiB
Solidity
81 lines
3.8 KiB
Solidity
// 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 { IRedstoneOracle } from "../interfaces/external/IRedstoneOracle.sol";
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import { Error as OracleError } from "../error.sol";
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import { ChainlinkOracleImpl } from "./chainlinkOracleImpl.sol";
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import { RedstoneOracleImpl } from "./redstoneOracleImpl.sol";
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/// @title Fallback Oracle implementation
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/// @notice This contract is used to get the exchange rate from a main oracle feed and a fallback oracle feed.
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//
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// @dev inheriting contracts should implement a view method to expose `_FALLBACK_ORACLE_MAIN_SOURCE`
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abstract contract FallbackOracleImpl is OracleError, RedstoneOracleImpl, ChainlinkOracleImpl {
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/// @dev which oracle to use as main source:
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/// - 1 = Chainlink ONLY (no fallback)
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/// - 2 = Chainlink with Redstone Fallback
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/// - 3 = Redstone with Chainlink Fallback
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uint8 internal immutable _FALLBACK_ORACLE_MAIN_SOURCE;
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/// @notice sets the main source, Chainlink Oracle and Redstone Oracle data.
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/// @param mainSource_ which oracle to use as main source:
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/// - 1 = Chainlink ONLY (no fallback)
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/// - 2 = Chainlink with Redstone Fallback
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/// - 3 = Redstone with Chainlink Fallback
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/// @param chainlinkParams_ chainlink Oracle constructor params struct.
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/// @param redstoneOracle_ Redstone Oracle data. (address can be set to zero address if using Chainlink only)
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constructor(
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uint8 mainSource_,
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ChainlinkConstructorParams memory chainlinkParams_,
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RedstoneOracleData memory redstoneOracle_
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)
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ChainlinkOracleImpl(chainlinkParams_)
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RedstoneOracleImpl(
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address(redstoneOracle_.oracle) == address(0)
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? RedstoneOracleData(IRedstoneOracle(_REDSTONE_ORACLE_NOT_SET_ADDRESS), false, 1)
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: redstoneOracle_
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)
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{
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if (mainSource_ < 1 || mainSource_ > 3) {
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revert FluidOracleError(ErrorTypes.FallbackOracle__InvalidParams);
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}
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_FALLBACK_ORACLE_MAIN_SOURCE = mainSource_;
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}
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/// @dev returns the exchange rate for the main oracle source, or the fallback source (if configured) if the main exchange rate
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/// fails to be fetched. If returned rate is 0, fetching rate failed or something went wrong.
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/// @return exchangeRate_ exchange rate
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/// @return fallback_ whether fallback was necessary or not
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function _getRateWithFallback() internal view returns (uint256 exchangeRate_, bool fallback_) {
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if (_FALLBACK_ORACLE_MAIN_SOURCE == 1) {
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// 1 = Chainlink ONLY (no fallback)
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exchangeRate_ = _getChainlinkExchangeRate();
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} else if (_FALLBACK_ORACLE_MAIN_SOURCE == 2) {
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// 2 = Chainlink with Redstone Fallback
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exchangeRate_ = _getChainlinkExchangeRate();
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if (exchangeRate_ == 0) {
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fallback_ = true;
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exchangeRate_ = _getRedstoneExchangeRate();
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}
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} else {
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// 3 = Redstone with Chainlink Fallback
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exchangeRate_ = _getRedstoneExchangeRate();
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if (exchangeRate_ == 0) {
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fallback_ = true;
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exchangeRate_ = _getChainlinkExchangeRate();
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}
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}
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}
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/// @dev returns the exchange rate for Chainlink, or Redstone if configured & Chainlink fails.
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function _getChainlinkOrRedstoneAsFallback() internal view returns (uint256 exchangeRate_) {
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exchangeRate_ = _getChainlinkExchangeRate();
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if (exchangeRate_ == 0 && _FALLBACK_ORACLE_MAIN_SOURCE != 1) {
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// Chainlink failed but Redstone is configured too -> try Redstone
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exchangeRate_ = _getRedstoneExchangeRate();
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}
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}
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}
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