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feat(raft-library): task 3.4 — raft_on_vote_reply quorum tracking; 6 tests + review fixes

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Rongsong Shen 2026-05-31 05:56:34 +00:00
parent e0bcb35554
commit f81054930f
3 changed files with 328 additions and 7 deletions
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60
src/lib/raft/raft.c
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@ -163,11 +163,63 @@ int raft_on_vote_request(raft_state_t *s, int from_idx, uint64_t term,
int raft_on_vote_reply(raft_state_t *s, int from_idx, int granted, uint64_t term)
{
(void)s;
(void)from_idx;
(void)granted;
(void)term;
return 0;
if (s->cbs->on_trace)
s->cbs->on_trace(s->ctx, "vote_reply_in", NULL);
/* Step 1: term upgrade — higher term means we lost the election */
if (term > s->term) {
s->term = term;
s->role = RAFT_FOLLOWER;
s->election_decided = 1;
s->cbs->on_become_follower(s->ctx, s->term, -1);
s->cbs->on_cancel_timeout(s->ctx);
if (s->cbs->on_trace)
s->cbs->on_trace(s->ctx, "became_follower", NULL);
return RAFT_BECAME_FOLLOWER;
}
/* Step 2: no-op guard — election already decided */
if (s->election_decided) {
if (s->cbs->on_trace)
s->cbs->on_trace(s->ctx, "vote_reply_noop", NULL);
return RAFT_PENDING;
}
/* Step 3: count this reply */
s->replies_received++;
/* Step 4: accumulate grant */
if (granted)
s->votes_granted++;
/* Step 5: quorum check */
int quorum = (s->n_peers / 2) + 1;
if (s->votes_granted >= quorum) {
s->role = RAFT_LEADER;
s->election_decided = 1;
s->cbs->on_become_leader(s->ctx, s->term);
s->cbs->on_cancel_timeout(s->ctx);
if (s->cbs->on_trace)
s->cbs->on_trace(s->ctx, "quorum_reached", NULL);
if (s->cbs->on_trace)
s->cbs->on_trace(s->ctx, "became_leader", NULL);
return RAFT_BECAME_LEADER;
}
/* Step 6: all-replied-no-quorum */
if (s->replies_received == s->n_peers - 1 && s->votes_granted < quorum) {
s->role = RAFT_FOLLOWER;
s->election_decided = 1;
s->cbs->on_become_follower(s->ctx, s->term, -1);
if (s->cbs->on_trace)
s->cbs->on_trace(s->ctx, "became_follower", NULL);
return RAFT_BECAME_FOLLOWER;
}
/* Step 7: still waiting */
return RAFT_PENDING;
}
void raft_on_election_timeout(raft_state_t *s)