Submission Details
Severity:
No need to declare a new variable for recent_winner
Summary
Using same name for recent_winner and self.recent_winner
Vulnerability Details
redundant variable declaration
@internal
def fulfillRandomWords(request_id: uint256, random_words: uint256[MAX_ARRAY_SIZE]):
index_of_winner: uint256 = random_words[0] % len(self.players)
@> recent_winner: address = self.players[index_of_winner]
@> self.recent_winner = recent_winner
self.players = []
self.raffle_state = RaffleState.OPEN
self.last_timestamp = block.timestamp
rarity: uint256 = random_words[0] % 3
self.tokenIdToRarity[ERC721._total_supply()] = rarity
log WinnerPicked(recent_winner)
ERC721._mint(recent_winner, ERC721._total_supply())
send(recent_winner, self.balance)
Impact
redundancy in code and gas
Tools Used
manual review
Recommendations
we can do this to make it more efficient
@internal
def fulfillRandomWords(request_id: uint256, random_words: uint256[MAX_ARRAY_SIZE]):
index_of_winner: uint256 = random_words[0] % len(self.players)
- recent_winner: address = self.players[index_of_winner]
- self.recent_winner = recent_winner
+ self.recent_winner = self.players[index_of_winner]
self.players = []
self.raffle_state = RaffleState.OPEN
self.last_timestamp = block.timestamp
rarity: uint256 = random_words[0] % 3
self.tokenIdToRarity[ERC721._total_supply()] = rarity
log WinnerPicked(recent_winner)
ERC721._mint(recent_winner, ERC721._total_supply())
send(recent_winner, self.balance)
Rewards breakdown
nSLOC
136This contest has a flat reward structure with the following payouts:
100 EXP
20 EXP
2 EXP
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