chore(beacon): drand protobuf and drand fake signer

[EclesioMeloJunior]

Summary of changes

• Includes the drand gossipsub proto definition
• Includes the fake drand signer, required for generating valid signatures while testing the gossipsub message handling & validation

Changes introduced in this pull request:

• Ref fetch beacon entries from gossipsub #7414

Reference issue to close (if applicable)

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Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

Outside contributions

• This pull request is based on an issue that a maintainer has accepted (see Before Opening a Pull Request).
• I have read and agree to the CONTRIBUTING document.
• I have read and agree to the AI Policy document. I understand that failure to comply with the guidelines will lead to rejection of the pull request.

Summary by CodeRabbit

• Tests
  • Added coverage for decoding and verifying drand beacon entries across multiple rounds, including checks of response payloads. The tests also exercise beacon entry creation and signature validation using a simulated signer, helping confirm that valid entries are accepted across the tested rounds.

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📥 Commits

Reviewing files that changed from the base of the PR and between 5e0c737 and 67000a8.

📒 Files selected for processing: 5

• proto/drand_pb.proto
• src/beacon/mod.rs
• src/beacon/signatures/mod.rs
• src/beacon/tests/drand.rs
• src/beacon/tests/fake_drand_signer.rs

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• filecoin-project/lotus (manual)

💤 Files with no reviewable changes: 1

• src/beacon/mod.rs

🚧 Files skipped from review as they are similar to previous changes: 1

• proto/drand_pb.proto

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Walkthrough

The changes add a test-only protobuf response type and a fake drand signer. A test encodes and decodes entries for rounds 1–5, then checks that the beacon verifies them.

Changes

Drand test support

Layer / File(s)	Summary
Protobuf response and test wiring proto/drand_pb.proto, src/beacon/drand_pb.rs, src/beacon/mod.rs, .gitattributes	The protobuf schema and Rust implementation define PublicRandResponse with round and signature fields. The module is compiled for tests, and the generated Rust file is marked as generated.
Fake signer and entry verification src/beacon/signatures/mod.rs, src/beacon/tests/drand.rs, src/beacon/mod.rs, src/beacon/tests/fake_drand_signer.rs	CSUITE_G1 is visible within crate::beacon. The test-only fake signer configures an unchained Quicknet test chain, signs round messages, encodes and decodes responses, and tests verification for rounds 1–5. Beacon constructors use named Filecoin timing constants.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 67000

This change only adds test support for drand gossipsub validation and does not affect production behavior. It has no actionable merge-blocking risk.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 30.77% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 5 files. (1 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely identifies the two main changes: adding the drand protobuf and the fake signer.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 30.77% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 5 files. (1 skipped: 1 unsupported.)

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[codecov]

Codecov Report

❌ Patch coverage is 54.54545% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.42%. Comparing base (3e69fed) to head (a129a48).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/beacon/drand_pb.rs	47.36%	6 Missing and 4 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
src/beacon/signatures/mod.rs	82.55% <100.00%> (+0.63%)	⬆️
src/beacon/drand_pb.rs	47.36% <47.36%> (ø)

... and 7 files with indirect coverage changes

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[akaladarshi]

@EclesioMeloJunior the PR title is not actually feat it should either test or chore, since changes are not adding any features.