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Proposal for Mantle USDe market (#939)
Co-authored-by: dmitriy-woof-software <[email protected]> Co-authored-by: Dmitriy Babenko <[email protected]> Co-authored-by: GitHub Actions Bot <>
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contracts/pricefeeds/ScalingPriceFeedWithCustomDescription.sol
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// SPDX-License-Identifier: BUSL-1.1 | ||
pragma solidity 0.8.15; | ||
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import "../vendor/@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol"; | ||
import "../IPriceFeed.sol"; | ||
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/** | ||
* @title Scaling price feed | ||
* @notice A custom price feed that scales up or down the price received from an underlying price feed and returns the result | ||
* @author Compound | ||
*/ | ||
contract ScalingPriceFeedWithCustomDescription is IPriceFeed { | ||
/** Custom errors **/ | ||
error InvalidInt256(); | ||
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/// @notice Version of the price feed | ||
uint public constant override version = 1; | ||
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/// @notice Description of the price feed | ||
string public description; | ||
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/// @notice Number of decimals for returned prices | ||
uint8 public immutable override decimals; | ||
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/// @notice Underlying price feed where prices are fetched from | ||
address public immutable underlyingPriceFeed; | ||
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/// @notice Whether or not the price should be upscaled | ||
bool internal immutable shouldUpscale; | ||
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/// @notice The amount to upscale or downscale the price by | ||
int256 internal immutable rescaleFactor; | ||
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/** | ||
* @notice Construct a new scaling price feed | ||
* @param underlyingPriceFeed_ The address of the underlying price feed to fetch prices from | ||
* @param decimals_ The number of decimals for the returned prices | ||
**/ | ||
constructor(address underlyingPriceFeed_, uint8 decimals_, string memory description_) { | ||
underlyingPriceFeed = underlyingPriceFeed_; | ||
decimals = decimals_; | ||
description = description_; | ||
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uint8 underlyingPriceFeedDecimals = AggregatorV3Interface(underlyingPriceFeed_).decimals(); | ||
// Note: Solidity does not allow setting immutables in if/else statements | ||
shouldUpscale = underlyingPriceFeedDecimals < decimals_ ? true : false; | ||
rescaleFactor = (shouldUpscale | ||
? signed256(10 ** (decimals_ - underlyingPriceFeedDecimals)) | ||
: signed256(10 ** (underlyingPriceFeedDecimals - decimals_)) | ||
); | ||
} | ||
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/** | ||
* @notice Price for the latest round | ||
* @return roundId Round id from the underlying price feed | ||
* @return answer Latest price for the asset in terms of ETH | ||
* @return startedAt Timestamp when the round was started; passed on from underlying price feed | ||
* @return updatedAt Timestamp when the round was last updated; passed on from underlying price feed | ||
* @return answeredInRound Round id in which the answer was computed; passed on from underlying price feed | ||
**/ | ||
function latestRoundData() override external view returns ( | ||
uint80 roundId, | ||
int256 answer, | ||
uint256 startedAt, | ||
uint256 updatedAt, | ||
uint80 answeredInRound | ||
) { | ||
(uint80 roundId_, int256 price, uint256 startedAt_, uint256 updatedAt_, uint80 answeredInRound_) = AggregatorV3Interface(underlyingPriceFeed).latestRoundData(); | ||
return (roundId_, scalePrice(price), startedAt_, updatedAt_, answeredInRound_); | ||
} | ||
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function signed256(uint256 n) internal pure returns (int256) { | ||
if (n > uint256(type(int256).max)) revert InvalidInt256(); | ||
return int256(n); | ||
} | ||
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function scalePrice(int256 price) internal view returns (int256) { | ||
int256 scaledPrice; | ||
if (shouldUpscale) { | ||
scaledPrice = price * rescaleFactor; | ||
} else { | ||
scaledPrice = price / rescaleFactor; | ||
} | ||
return scaledPrice; | ||
} | ||
} |
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