Optimize Testimonial struct packing timestamp uint256 to uint64#37
Optimize Testimonial struct packing timestamp uint256 to uint64#37Atharva0506 wants to merge 2 commits into
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WalkthroughChanged the ChangesTestimonial struct packing & ABI/types
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Pull request overview
This PR optimizes the VouchMe.Testimonial storage layout by shrinking timestamp from uint256 to uint64 and reordering fields to improve packing, then updates the web ABI/typechain outputs and adjusts tests to match.
Changes:
- Update
Testimonial.timestamptouint64and reorder fields for tighter storage packing - Update ABI + TypeChain artifacts to reflect the new struct field order/types
- Adjust Solidity test assertion(s) to match the new
uint64timestamp type
Reviewed changes
Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.
Show a summary per file
| File | Description |
|---|---|
| contracts/src/VouchMe.sol | Reorders Testimonial fields and changes timestamp to uint64; updates struct initialization and metadata serialization ordering. |
| contracts/test/VouchMe.t.sol | Updates timestamp assertion to compare against a uint64 cast. |
| web/src/abis/VouchMe.json | Updates ABI struct components (order + uint64 timestamp). |
| web/src/typechain-types/VouchMe.ts | Updates generated TypeChain struct input/output typings to match ABI changes. |
| web/src/typechain-types/factories/VouchMe__factory.ts | Updates generated factory ABI definition for Testimonial (order + uint64 timestamp). |
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| '","verified":"', testimonial.verified ? "true" : "false", | ||
| '","timestamp":"', uint256(testimonial.timestamp).toString(), | ||
| '"}' |
Addressed Issues:
Fixes #38
This pull request optimizes the
Testimonialstruct by changing thetimestampfield fromuint256touint64and adjusting the field layout. Becausetimestampis now 8 bytes, it securely packs withreceiver(20 bytes) andverified(1 byte) into exactly one 32-byte storage slot.This structural upgrade reduces the
Testimoniallayout from 7 storage slots down to 6, significantly shaving gas costs across the board without sacrificing functionality (asuint64universally handles timestamps up to the year 584,942,417,355).Gas Efficiency Benchmarks & Full Reductions
Below is the comprehensive comparison of gas consumption across all test suites, showcasing exactly how much gas was saved:
1. Unit Tests (
VouchMe.t.sol)testEfficientArrayRemovaltestReplaceExistingTestimonialtestCreateMultipleTestimonialsForSameReceivertestCreateTestimonialBasictestTokensAreNonTransferabletestTokenURIGenerationtestCreateTestimonialEmitsEventtestCannotDeleteOthersTestimonialtestCannotDeleteAlreadyDeletedTestimonialtestDeleteTestimonialtestEmptyStringInputs2. Integration Tests (
VouchMeIntegration.t.sol)(These emulate large-scale operations where optimizations scale significantly)
testLargeScaleDeletiontestNetworkEffectstestCompleteWorkflowtestProfileUpdatesWithTestimonials3. Fuzz Tests (
VouchMeFuzz.t.sol)(Values represent the mathematical mean (μ) gas usage across 256 random runs)
testFuzzArrayManagementtestFuzzTestimonialReplacementtestFuzzMultipleTestimonialstestFuzzCreateTestimonial4. Signature Tests (
VouchMeSignature.t.sol)testValidSignatureScreenshots/Recordings:
Before Optimization:
Before Log File (Clean/No Warnings):
tests_before_optimization.log
After Optimization:
After Log File (Clean/No Warnings):
tests_after_optimization.log
Additional Notes:
VouchMe.sol): ReorderedTestimonialfields and updatedtimestamptouint64. This single change successfully compounds into massive scaling gas reliefs (saving upwards of 650K+ gas on large array operations).VouchMe.json,VouchMe.ts, and factory files. No frontend logic rewrite is required sinceethers.jsgracefully maps returneduint64values tobigintexactly as it did foruint256.AI Usage Disclosure:
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