fix(chainlink): report error when response_slot < min_context_slot

[0xzrf]

Summary

Report error inside RemoteAccountProvider::fetch() when response_slot < min_context_slot instead of panicking on assert!

Summary by CodeRabbit

• Bug Fixes
  • Improved error handling for remote account provider to gracefully handle cases where response slots don't meet minimum requirements. Pending requests are now properly notified instead of causing system failures.

[coderabbitai]

📝 Walkthrough

Walkthrough

In RemoteAccountProvider::fetch, the async RPC-fetch loop replaces an assertion with explicit runtime validation. When the RPC response slot is below the minimum context slot threshold, the code now formats an error message, notifies pending requests via notify_error, and returns early instead of panicking. Otherwise, execution proceeds to existing account count validation and result handling.

Suggested reviewers

• GabrielePicco
• thlorenz

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@magicblock-chainlink/src/remote_account_provider/mod.rs`:
- Around line 2130-2137: The post-fetch check that logs "Response slot
{response_slot} < {min_context_slot}..." (using response_slot, min_context_slot,
pubkeys_str and notify_error) is unreachable because the fetch loop already
retries on slot < min_context_slot via the retry! path; move this explicit
min-context-slot failure reporting into the retry-exhaustion branch that handles
the retry! failure for the slot < min_context_slot case so callers receive a
deterministic "Minimum context slot ... not reached" error; remove the redundant
post-fetch branch or make it a no-op, and ensure the error text matches the
existing downstream "Minimum context slot ... not reached" wording so callers
get the same contract.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 01b39403-dd10-441f-ac48-f522377531fb

📥 Commits

Reviewing files that changed from the base of the PR and between a76aa3b and 0745dfe.

📒 Files selected for processing (1)

• magicblock-chainlink/src/remote_account_provider/mod.rs

[coderabbitai]

⚠️ Potential issue | 🟠 Major | ⚡ Quick win

Min-context-slot failure reason is effectively bypassed by current control flow

At Line 2130, this check runs after the fetch loop that already handles slot < min_context_slot (Line 2027) via retry!, so this branch is effectively unreachable in normal execution. On retry exhaustion, callers get a generic max-retries error instead of a deterministic min-context-slot-not-reached reason, which weakens the cross-layer error contract.

Please move the explicit min-context-slot failure reporting into the retry-exhaustion path for the slot < min_context_slot case (and keep the error text aligned with existing “Minimum context slot … not reached” handling used downstream).

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@magicblock-chainlink/src/remote_account_provider/mod.rs` around lines 2130 -
2137, The post-fetch check that logs "Response slot {response_slot} <
{min_context_slot}..." (using response_slot, min_context_slot, pubkeys_str and
notify_error) is unreachable because the fetch loop already retries on slot <
min_context_slot via the retry! path; move this explicit min-context-slot
failure reporting into the retry-exhaustion branch that handles the retry!
failure for the slot < min_context_slot case so callers receive a deterministic
"Minimum context slot ... not reached" error; remove the redundant post-fetch
branch or make it a no-op, and ensure the error text matches the existing
downstream "Minimum context slot ... not reached" wording so callers get the
same contract.