Minor gas optimizations in ElectionFactory#221
Minor gas optimizations in ElectionFactory#221Esar1212 wants to merge 1 commit intoAOSSIE-Org:mainfrom
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📝 WalkthroughWalkthroughA Solidity smart contract has been optimized by making the factory owner an immutable state variable, refactoring election creation to use array-based IDs instead of a counter with unchecked arithmetic, and implementing a swap-and-pop pattern for efficient array element deletion. Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes Poem
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Actionable comments posted: 1
🤖 Fix all issues with AI agents
In `@blockchain/contracts/ElectionFactory.sol`:
- Around line 81-86: The code mixes a persistent counter (electionCount) with
array indices (openBasedElections.length) which breaks after swap-and-pop in
deleteElection(); fix by using a stable persistent ID for elections: assign id =
electionCount, set electionOwner[electionCount] = msg.sender, pass electionCount
into initialize(), push the election address into openBasedElections and also
maintain a mapping electionIdToIndex[electionCount] =
openBasedElections.length-1 (and update that mapping when you swap in
deleteElection()), increment electionCount afterwards; alternatively, if you
prefer no index mapping, change deleteElection() to perform lazy deletion (set a
deleted flag on the election struct) instead of swap-and-pop so stored IDs
remain valid (update functions referencing electionOwner, initialize,
deleteElection to use the chosen ID strategy).
| unchecked{ //Skips overflow check as electionCount will never be that high. | ||
| electionCount++; | ||
| } | ||
| uint electionId = openBasedElections.length; | ||
| electionOwner[electionId] = msg.sender; | ||
| openBasedElections.push(address(election)); |
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🧩 Analysis chain
🏁 Script executed:
find . -type f -name "*.sol" | head -20Repository: AOSSIE-Org/Agora-Blockchain
Length of output: 1128
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fd -t f -name "*.sol" | grep -E "(Election|election)" | head -20Repository: AOSSIE-Org/Agora-Blockchain
Length of output: 301
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rg -n "initialize\(" -t sol -C 2 | head -100Repository: AOSSIE-Org/Agora-Blockchain
Length of output: 98
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rg -n "electionCount" -t sol -C 2Repository: AOSSIE-Org/Agora-Blockchain
Length of output: 98
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rg -n "deleteElection|getOpenElections" -t sol -C 2Repository: AOSSIE-Org/Agora-Blockchain
Length of output: 98
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cat blockchain/contracts/Election.sol | head -50Repository: AOSSIE-Org/Agora-Blockchain
Length of output: 1441
🏁 Script executed:
#!/bin/bash
# First, locate the files
echo "=== Finding Election-related files ==="
find . -type f -name "*.sol" | grep -i election
echo -e "\n=== Searching for initialize method signatures ==="
rg -n "function initialize" -t sol -C 2
echo -e "\n=== Searching for electionCount usage ==="
rg -n "electionCount" -t sol -C 2
echo -e "\n=== Searching for deleteElection ==="
rg -n "deleteElection" -t sol -C 3
echo -e "\n=== Searching for getOpenElections ==="
rg -n "getOpenElections" -t sol -C 3Repository: AOSSIE-Org/Agora-Blockchain
Length of output: 490
🏁 Script executed:
#!/bin/bash
echo "=== Initialize method in Election.sol ==="
rg -n "function initialize" -A 5
echo -e "\n=== electionCount usage patterns ==="
rg -n "electionCount" -B 2 -A 2
echo -e "\n=== deleteElection implementation ==="
rg -n "deleteElection|function.*delete" -B 1 -A 5
echo -e "\n=== openBasedElections array operations ==="
rg -n "openBasedElections" -B 1 -A 1
echo -e "\n=== ID parameter passing to initialize ==="
rg -n "election.initialize|\.initialize" -B 2 -A 2Repository: AOSSIE-Org/Agora-Blockchain
Length of output: 50386
Resolve ID inconsistency between electionCount and array indices.
The initialize() call receives electionCount as the election ID, but electionOwner is keyed by array indices (openBasedElections.length). While these align during creation, the swap-and-pop deletion in deleteElection() reorganizes array positions without updating stored election IDs, causing misalignment. If downstream code or users attempt deletion using a stored electionId, it will target the wrong mapping entry or array position. Use either a persistent counter for all ID assignments or refactor deletion to avoid array compaction (e.g., lazy deletion with a deleted flag).
🤖 Prompt for AI Agents
In `@blockchain/contracts/ElectionFactory.sol` around lines 81 - 86, The code
mixes a persistent counter (electionCount) with array indices
(openBasedElections.length) which breaks after swap-and-pop in deleteElection();
fix by using a stable persistent ID for elections: assign id = electionCount,
set electionOwner[electionCount] = msg.sender, pass electionCount into
initialize(), push the election address into openBasedElections and also
maintain a mapping electionIdToIndex[electionCount] =
openBasedElections.length-1 (and update that mapping when you swap in
deleteElection()), increment electionCount afterwards; alternatively, if you
prefer no index mapping, change deleteElection() to perform lazy deletion (set a
deleted flag on the election struct) instead of swap-and-pop so stored IDs
remain valid (update functions referencing electionOwner, initialize,
deleteElection to use the chosen ID strategy).
|
Thanks for flagging this. I agree there is a potential ID inconsistency between the persistent electionCount passed to Election.initialize and the index-based management of openBasedElections, particularly with swap-and-pop deletion. I’ve intentionally kept this PR limited to gas/readability improvements and avoided altering election lifecycle semantics. I believe this deserves a dedicated discussion or follow-up PR so we can agree on a single source of truth for election IDs. Happy to proceed based on maintainer preference. |
1 participant
Description
This PR introduces minor gas and code-quality optimizations in the ElectionFactory contract without altering existing functionality or external behavior.
The changes focus on:
Improving parameter handling and visibility choices for better gas efficiency
Removing unnecessary storage reads where possible
Enhancing overall code clarity and consistency
No functional logic has been modified, and all existing tests continue to pass.
Type of change
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Checklist:
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