currentPrice

Contract: JBChainlinkV3PriceFeed​‌

Interface: IJBPriceFeed

Step by step

Gets the current price from the feed, normalized to the specified number of decimals.

Definition

function currentPrice(uint256 _decimals) external view override returns (uint256)  { ... }

• Arguments:
  • _decimals is the number of decimals the returned fixed point price should include.
• The view function can be accessed externally by anyone.
• The view function does not alter state on the blockchain.
• The function overrides a function definition from the IJBPriceFeed interface.
• The function returns the current price of the feed, as a fixed point number with the specified number of decimals.

Body

1. Get the latest price being reported by the price feed. The latestRoundData function returns several feed parameters, but only the _price is needed.

   // Get the latest round information. Only need the price is needed.
   (, int256 _price, , , ) = feed.latestRoundData();

   Internal references:

   • feed

   External references:

   • latestRoundData

2. Get the number of decimals being reported by the price feed that the provided price is expected to have.

   // Get a reference to the number of decimals the feed uses.
   uint256 _feedDecimals = feed.decimals();

   Internal references:

   • feed

   External references:

   • decimals

3. Return the fixed point price after normalizing the value to the desired number of decimals.

   // Return the price, adjusted to the target decimals.
   return uint256(_price).adjustDecimals(_feedDecimals, _decimals);

   Library references:

   • JBFixedPointNumber
     • .adjustDecimals(...)

Code

/**
  @notice
  Gets the current price from the feed, normalized to the specified number of decimals.

  @param _decimals The number of decimals the returned fixed point price should include.

  @return The current price of the feed, as a fixed point number with the specified number of decimals.
*/
function currentPrice(uint256 _decimals) external view override returns (uint256) {
  // Get the latest round information. Only need the price is needed.
  (, int256 _price, , , ) = feed.latestRoundData();

  // Get a reference to the number of decimals the feed uses.
  uint256 _feedDecimals = feed.decimals();

  // Return the price, adjusted to the target decimals.
  return uint256(_price).adjustDecimals(_feedDecimals, _decimals);
}

Bug bounty

Category	Description	Reward
Optimization	Help make this operation more efficient.	0.5ETH
Low severity	Identify a vulnerability in this operation that could lead to an inconvenience for a user of the protocol or for a protocol developer.	1ETH
High severity	Identify a vulnerability in this operation that could lead to data corruption or loss of funds.	5+ETH