_currentFeeDiscount

Contract: JBPayoutRedemptionPaymentTerminal​‌

Step by step

Get the fee discount from the fee gauge for the specified project.

Definition

function _currentFeeDiscount(uint256 _projectId) private view returns (uint256) { ... }

• Arguments:
  • _projectId is the ID of the project to get a fee discount for.
• The view function is private to this contract.
• The view function does not alter state on the blockchain.
• The function returns thhe fee discount, which should be interpreted as a percentage out MAX_FEE_DISCOUNT.

Body

1. If the fee beneficiary project doesn't have a terminal that accepts this terminal's token, no fee can be taken so a max discount should be returned.

   if (
     directory.primaryTerminalOf(_FEE_BENEFICIARY_PROJECT_ID, token) ==
     IJBPaymentTerminal(address(0))
   ) return JBConstants.MAX_FEE_DISCOUNT;

   Library references:

   • JBConstants
     • .MAX_FEE_DISCOUNT

   Internal references:

   • directory
   • _FEE_BENEFICIARY_PROJECT_ID

   External references:

   • primaryTerminalOf

2. If there's a gauge, ask it for the discount. Otherwise, there is no discount. If the gauge reverts, set the discount to 0.

   // Get the fee discount.
   if (feeGauge != IJBFeeGauge(address(0)))
     // If the guage reverts, keep the discount at 0.
     try feeGauge.currentDiscountFor(_projectId) returns (uint256 discount) {
       // If the fee discount is greater than the max, we ignore the return value
       if (discount <= JBConstants.MAX_FEE_DISCOUNT) return discount;
     } catch {
       return 0;
     }

   Internal references:

   • feeGauge

   External references:

   • currentDiscountFor

Code

/**
  @notice
  Get the fee discount from the fee gauge for the specified project.

  @param _projectId The ID of the project to get a fee discount for.

  @return feeDiscount The fee discount, which should be interpreted as a percentage out MAX_FEE_DISCOUNT.
*/
function _currentFeeDiscount(uint256 _projectId) internal view returns (uint256) {
  // Can't take a fee if the protocol project doesn't have a terminal that accepts the token.
  if (
    directory.primaryTerminalOf(_FEE_BENEFICIARY_PROJECT_ID, token) ==
    IJBPaymentTerminal(address(0))
  ) return JBConstants.MAX_FEE_DISCOUNT;

  // Get the fee discount.
  if (feeGauge != IJBFeeGauge(address(0)))
    // If the guage reverts, keep the discount at 0.
    try feeGauge.currentDiscountFor(_projectId) returns (uint256 discount) {
      // If the fee discount is greater than the max, we ignore the return value
      if (discount <= JBConstants.MAX_FEE_DISCOUNT) return discount;
    } catch {
      return 0;
    }

  return 0;
}

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