Submission Details
Impact:
Likelihood:
State Variable Not Declared Immutable
Author Revealed upon completion
Root + Impact
Description
The contract sets the variables faucetDrip, sepEthAmountToDrip, and dailySepEthCap in the constructor, and their values never change after deployment. Declaring these as immutable would save gas and make it clear to anyone reading the code that these values are fixed for the lifetime of the contract.
uint256 public faucetDrip; // @> Should be declared immutable
uint256 public sepEthAmountToDrip; // @> Should be declared immutable
uint256 public dailySepEthCap; // @> Should be declared immutable
Risk
Likelihood:
This issue is present in every deployment of the contract until the variable are made immutable.
Impact:
The contract uses more gas than necessary for these variables.
Proof of Concept
// These variables are only set in the constructor and never changed afterwards.
RaiseBoxFaucet.sol:
uint256 public faucetDrip;
uint256 public sepEthAmountToDrip;
uint256 public dailySepEthCap;
// After deployment, their values never change.
Recommended Mitigation
- uint256 public faucetDrip;
+ uint256 public immutable faucetDrip;
- uint256 public sepEthAmountToDrip;
+ uint256 public immutable sepEthAmountToDrip;
- uint256 public dailySepEthCap;
+ uint256 public immutable dailySepEthCap;
Rewards breakdown
nSLOC
157This contest has a flat reward structure with the following payouts:
100 EXP
20 EXP
2 EXP
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