[PERF] Build Single-Transaction Multi-Slot Storage Vector Fetcher

[mijinummi]

Labels: medium-difficulty, solidity, storage, gasguard
Difficulty: Medium
Module: contracts/storage/

---

🧠 Concept

Create a utility function that packs reads from multiple contiguous storage slots into a single dynamic bytes32[] output buffer via Yul loops.

⚠️ Problem

Querying multiple non-contiguous state variables across client applications requires multiple RPC requests or standard abi.encode bloat.

📁 Implementation Scope

• contracts/storage/StorageSlotFetcher.sol
• test/storage/StorageSlotFetcher.test.ts

🛠️ Requirements

1. Accept array of slot keys (bytes32[] slots).
2. Iterate through slots using low-level sload in Yul and construct returned buffer directly in memory.

🎯 Acceptance Criteria

• Fetches up to 100 storage slots in a single view invocation efficiently.
• Keeps gas usage per slot read minimal by eliminating ABI boilerplate.

[Malcolm-Wander]

@Malcolm-Wander has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello maintainer,I’d love to work on this issue please,I promise to do a good and swift job..thank you.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Malcolm-Wander to this issue.

[The-Big-Danny]

@The-Big-Danny has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

hello, can i WORK on this issue?, i can fix it.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @The-Big-Danny to this issue.

[devwums]

@devwums has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi, I'd like to take this on.

I'm a full-stack developer with solid experience in modern JavaScript/TypeScript, REST APIs, and frontend frameworks like React. I enjoy working in open source and following existing project conventions.

I've gone through the details of this issue and I'm confident I can deliver a clean, well-tested solution that fits the codebase.

I'd appreciate being assigned to this issue and look forward to contributing.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @devwums to this issue.

[drips-wave]

Congratulations, @devwums! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @devwums: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[drips-wave]

This issue has been completed by @devwums as part of the Stellar Wave Program's 7th Wave 🥳

😎 @devwums: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.