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feat(ha-prevote): implement pure voter-side PreVote decision (task 2.1)

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raft_on_pre_vote_request: deny on stale term, else reuse on_vote_eligible
(primary/heartbeat-stickiness/catch-up gates). Never mutates term/voted_for/
role and never persists or adopts a higher term. 6 RED-first raft unit tests
assert the purity invariant; libxce suite green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Rongsong Shen 2026-06-16 04:24:23 +00:00
parent 449b8e9e93
commit 722fee5323
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.kiro/specs/ha-prevote/tasks.md
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@ -16,7 +16,7 @@
- _Boundary: raft pre-vote functions_
- [ ] 2. Core: raft-library pure PreVote decision and tally (test-first, no side effects)
- [ ] 2.1 Implement the voter-side PreVote decision
- [x] 2.1 Implement the voter-side PreVote decision
- RED first: add raft unit tests asserting grant for a fresh, higher-or-equal-term candidate when the eligibility callback allows it, and deny on stale term or when the eligibility callback rejects.
- Reuse the existing vote-eligibility callback (primary-deny, fresh-heartbeat stickiness, catch-up deny) and let the dispatcher apply freshness beforehand, exactly as the real-vote path does.
- Observable: after a granted PreVote the test confirms term, voted-for, and role are all unchanged and no persist callback fired.