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86
contracts/pricefeeds/ScalingPriceFeedWithCustomDescription.sol
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| // 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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