Erc20RewardMinterFacetStorage Code Style Findings

ERS-01C: Inefficient ABI Encoding Mechanism

Type	Severity	Location
Gas Optimization		Erc20RewardMinterFacetStorage.sol:L181

Description:

The referenced ABI encoding mechanism utilizes a string literal rather than the actual function signature of IERC20Extended::mint to generate the relevant payload.

Example:

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180// Call Reward Asset Handler to execute mint on the reward token contract with receiver being `to` address
181bytes memory data = abi.encodeWithSignature("mint(address,uint256)", to, amountToTransfer);

Recommendation:

We advise the abi.encodeWithSelector function to be utilized instead by importing the relevant IERC20Extended interface and utilizing the IERC20Extended.mint.selector syntax, optimizing the code's gas cost and syntax.

Alleviation (b64b659786cf3c84bea52feb3a69f546ba3601f0):

The abi.encodeWithSelector variant was incorporated into the codebase, addressing this exhibit as advised.

ERS-02C: Inefficient mapping Lookups

Type	Severity	Location
Gas Optimization		Erc20RewardMinterFacetStorage.sol:L183

Description:

The linked statements perform key-based lookup operations on mapping declarations from storage multiple times for the same key redundantly.

Example:

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174for (uint256 i = 0; i < length; i++) {
175    address tokenAddress = campaignPacketInfo.tokenAddresses[i];
176    uint256 amountToTransfer = campaignPacketInfo.amountOfTokensPerPacket[tokenAddress] * amountOfPackets;
177
178    // IMPORTANT: The campaign's reward asset handler should have minter role on every reward token[i]
179
180    // Call Reward Asset Handler to execute mint on the reward token contract with receiver being `to` address
181    bytes memory data = abi.encodeWithSignature("mint(address,uint256)", to, amountToTransfer);
182
183    ICampaignAssetManager(GeneralStorage.layout().campaignsInfo[campaignId].rewardAssetHandler).execute(
184        tokenAddress,
185        data
186    );
187}

Recommendation:

As the lookups internally perform an expensive keccak256 operation, we advise the lookups to be cached wherever possible to a single local declaration that either holds the value of the mapping in case of primitive types or holds a storage pointer to the struct contained.

As the compiler's optimizations may take care of these caching operations automatically at-times, we advise the optimization to be selectively applied, tested, and then fully adopted to ensure that the proposed caching model indeed leads to a reduction in gas costs.

Alleviation (b64b659786cf3c84bea52feb3a69f546ba3601f0):

All referenced inefficient mapping lookups have been optimized to the greatest extent possible, significantly reducing the gas cost of the functions the statements were located in.

ERS-03C: Non-Standard Storage Slot Definition

Type	Severity	Location
Standard Conformity		Erc20RewardMinterFacetStorage.sol:L54

Description:

The referenced declaration will define a storage slot for use by a facet of the system's main EIP-2535 Diamond, however, the way it is declared does not adhere to the latest standards.

Example:

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52/// @dev Unique identifier for the storage slot where the Layout struct is stored.
53bytes32 internal constant STORAGE_SLOT =
54    keccak256("evergonlabs.Staking.mintReward.storage.Erc20RewardMinterFacetStorage");

Recommendation:

We advise the EIP-7201 name-spaced layout approach to be adhered to similarly to OpenZeppelin and other relevant standard libraries, ensuring consistency among the ecosystem's widely utilized libraries and conforming to the latest standards.

Alleviation (b64b659786cf3c84bea52feb3a69f546ba3601f0):

The referenced slot definition has been updated to its standardized EIP-7201 representation, addressing this exhibit.

ERS-04C: Repetitive Value Literal

Type	Severity	Location
Code Style		Erc20RewardMinterFacetStorage.sol:L112

Description:

The linked value literal is repeated across the codebase multiple times.

Example:

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112if (GeneralStorage.layout().campaignsInfo[campaignId].state != 1) {

Recommendation:

We advise it to be set to a constant variable instead, optimizing the legibility of the codebase.

In case the constant has already been declared, we advise it to be properly re-used across the code.

Alleviation (b64b659786cf3c84bea52feb3a69f546ba3601f0):

The referenced literal has been properly introduced as part of the GeneralStakingStorage declarations and specifically as an ON_CREATION state, addressing this exhibit.