Multiplicative Price Feed #757
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| constructor(address priceFeedA_, address priceFeedB_, uint8 decimals_, string memory description_) { | ||
| priceFeedA = priceFeedA_; | ||
| priceFeedB = priceFeedB_; | ||
| uint8 priceFeedADecimals = AggregatorV3Interface(priceFeedA_).decimals(); | ||
| uint8 priceFeedBDecimals = AggregatorV3Interface(priceFeedB_).decimals(); | ||
| combinedScale = signed256(10 ** (priceFeedADecimals + priceFeedBDecimals)); | ||
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| if (decimals_ > 18) revert BadDecimals(); | ||
| decimals = decimals_; | ||
| description = description_; | ||
| priceFeedScale = int256(10 ** decimals); | ||
| } |
Check notice
Code scanning / Semgrep
Semgrep Finding: rules.solidity.performance.non-payable-constructor
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| constructor(address priceFeedA_, address priceFeedB_, uint8 decimals_, string memory description_) { | ||
| priceFeedA = priceFeedA_; | ||
| priceFeedB = priceFeedB_; | ||
| uint8 priceFeedADecimals = AggregatorV3Interface(priceFeedA_).decimals(); | ||
| uint8 priceFeedBDecimals = AggregatorV3Interface(priceFeedB_).decimals(); | ||
| combinedScale = signed256(10 ** (priceFeedADecimals + priceFeedBDecimals)); | ||
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| if (decimals_ > 18) revert BadDecimals(); | ||
| decimals = decimals_; | ||
| description = description_; | ||
| priceFeedScale = int256(10 ** decimals); | ||
| } |
Check warning
Code scanning / Semgrep
Semgrep Finding: compound.solidity.missing-constructor-sanity-checks
Comment on lines
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to
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| constructor(address priceFeedA_, address priceFeedB_, uint8 decimals_, string memory description_) { | ||
| priceFeedA = priceFeedA_; | ||
| priceFeedB = priceFeedB_; | ||
| uint8 priceFeedADecimals = AggregatorV3Interface(priceFeedA_).decimals(); | ||
| uint8 priceFeedBDecimals = AggregatorV3Interface(priceFeedB_).decimals(); | ||
| combinedScale = signed256(10 ** (priceFeedADecimals + priceFeedBDecimals)); | ||
|
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||
| if (decimals_ > 18) revert BadDecimals(); | ||
| decimals = decimals_; | ||
| description = description_; | ||
| priceFeedScale = int256(10 ** decimals); | ||
| } |
Check warning
Code scanning / Semgrep
Semgrep Finding: compound.solidity.missing-constructor-sanity-checks
Comment on lines
+45
to
+56
| constructor(address priceFeedA_, address priceFeedB_, uint8 decimals_, string memory description_) { | ||
| priceFeedA = priceFeedA_; | ||
| priceFeedB = priceFeedB_; | ||
| uint8 priceFeedADecimals = AggregatorV3Interface(priceFeedA_).decimals(); | ||
| uint8 priceFeedBDecimals = AggregatorV3Interface(priceFeedB_).decimals(); | ||
| combinedScale = signed256(10 ** (priceFeedADecimals + priceFeedBDecimals)); | ||
|
|
||
| if (decimals_ > 18) revert BadDecimals(); | ||
| decimals = decimals_; | ||
| description = description_; | ||
| priceFeedScale = int256(10 ** decimals); | ||
| } |
Check warning
Code scanning / Semgrep
Semgrep Finding: compound.solidity.missing-constructor-sanity-checks
scott-silver
reviewed
Jun 8, 2023
|
Forgot to merge this. Here is the final audit report from OZ: https://gist.github.com/antonleviathan/2938185330642deffe141f682375678b |
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This generalizes the logic used in the recently audited
WBTCPriceFeedto create aMultiplicativePriceFeedthat derives its price from multiplying the prices from two other price feeds together.This is a flexible wrapper price feed that can be used to generate prices for any asset that does not have a price feed that fits Comet's expected price denomination. e.g. if we wanted to add
cbETHtocUSDCv3, there is no Chainlink price feed forcbETH / USD, so we would need to multiply thecbETH / ETHandETH / USDprice feeds together to getcbETH / USD