forked from lei.chen/myxce
Rongsong Shen
e6b234a6a4
Four property-style raft tests proving the PreVote API preserves the safety invariants: term/voted_for/role never change and on_persist never fires across mixed begin/request/reply sequences (WON and LOST); a WON round creates no leader (stays FOLLOWER); and the real-vote higher-term-adopt + step-down + quorum-elect path is unchanged (bug-339/340 intact). Records the TLA+/checklist consistency argument (RN-1) in test_raft.c and research.md, citing the tests as evidence. Raft suite 123/0/0; zero production change. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
4002 lines
133 KiB
C
4002 lines
133 KiB
C
#include <errno.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <unity/unity.h>
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#include "../raft/raft.h"
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/* ---------- stub callbacks ---------- */
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static int stub_send_vote_request(void *ctx, int peer_idx, uint64_t term)
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{
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(void)ctx; (void)peer_idx; (void)term;
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return 0;
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}
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static void stub_become_leader(void *ctx, uint64_t term)
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{
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(void)ctx; (void)term;
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}
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static void stub_become_follower(void *ctx, uint64_t term, int leader_idx)
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{
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(void)ctx; (void)term; (void)leader_idx;
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}
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static int stub_persist(void *ctx, uint64_t term, int voted_for)
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{
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(void)ctx; (void)term; (void)voted_for;
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return 0;
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}
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static void stub_schedule_timeout(void *ctx, uint32_t delay_ms)
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{
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(void)ctx; (void)delay_ms;
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}
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static void stub_cancel_timeout(void *ctx)
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{
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(void)ctx;
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}
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static void stub_start_election_after_delay(void *ctx, uint32_t delay_ms)
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{
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(void)ctx; (void)delay_ms;
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}
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/* Build a fully-populated callbacks struct */
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static raft_callbacks_t make_full_cbs(void)
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{
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raft_callbacks_t cbs;
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memset(&cbs, 0, sizeof(cbs));
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cbs.on_send_vote_request = stub_send_vote_request;
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cbs.on_become_leader = stub_become_leader;
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cbs.on_become_follower = stub_become_follower;
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cbs.on_persist = stub_persist;
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cbs.on_schedule_timeout = stub_schedule_timeout;
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cbs.on_cancel_timeout = stub_cancel_timeout;
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cbs.on_start_election_after_delay = stub_start_election_after_delay;
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/* on_vote_eligible and on_trace left NULL (optional) */
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return cbs;
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}
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/* ---------- mock infrastructure for raft_start_election tests ---------- */
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/* Per-test counters — reset by each test before calling start_election */
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typedef struct {
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int send_vote_request_count;
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int last_send_peer_idx;
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uint64_t last_send_term;
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/* track each peer index sent (up to 8 for test purposes) */
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int sent_peers[8];
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int schedule_timeout_count;
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uint32_t last_schedule_delay;
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int persist_count;
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uint64_t last_persist_term;
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int last_persist_voted_for;
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int persist_return_value; /* configurable: 0=success, non-zero=fail */
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int become_leader_count;
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uint64_t last_become_leader_term;
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/* on_vote_eligible mock */
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int vote_eligible_return_value; /* configurable: 1=grant, 0=deny; default 1 */
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int vote_eligible_call_count;
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/* on_trace mock */
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int trace_call_count;
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char last_trace_event[64];
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/* on_become_follower mock */
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int become_follower_count;
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uint64_t last_become_follower_term;
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int last_become_follower_leader_idx;
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/* on_cancel_timeout mock */
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int cancel_timeout_count;
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/* on_start_election_after_delay mock (task 3.5) */
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int start_election_after_delay_count;
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uint32_t last_start_election_delay;
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/* on_send_pre_vote_request mock (task 2.2) */
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int send_pre_vote_request_count;
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int last_pre_vote_peer_idx;
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uint64_t last_pre_vote_term;
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/* per-peer prospective term recorded by index (up to 8) */
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uint64_t pre_vote_sent_term[8]; /* term sent to peer i; 0 = not sent */
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int pre_vote_sent_peers[8]; /* ordered list of peer indices sent to */
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} mock_cbs_state_t;
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static mock_cbs_state_t g_mock;
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static void reset_mock(void)
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{
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memset(&g_mock, 0, sizeof(g_mock));
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/* Defaults: persist succeeds, vote_eligible grants */
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g_mock.persist_return_value = 0;
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g_mock.vote_eligible_return_value = 1;
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}
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static int mock_send_vote_request(void *ctx, int peer_idx, uint64_t term)
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{
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(void)ctx;
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if (g_mock.send_vote_request_count < 8)
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g_mock.sent_peers[g_mock.send_vote_request_count] = peer_idx;
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g_mock.last_send_peer_idx = peer_idx;
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g_mock.last_send_term = term;
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g_mock.send_vote_request_count++;
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return 0;
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}
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static void mock_become_leader(void *ctx, uint64_t term)
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{
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(void)ctx;
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g_mock.become_leader_count++;
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g_mock.last_become_leader_term = term;
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}
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static void mock_become_follower(void *ctx, uint64_t term, int leader_idx)
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{
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(void)ctx;
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g_mock.become_follower_count++;
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g_mock.last_become_follower_term = term;
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g_mock.last_become_follower_leader_idx = leader_idx;
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}
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static void mock_cancel_timeout(void *ctx)
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{
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(void)ctx;
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g_mock.cancel_timeout_count++;
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}
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static void mock_start_election_after_delay(void *ctx, uint32_t delay_ms)
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{
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(void)ctx;
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g_mock.start_election_after_delay_count++;
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g_mock.last_start_election_delay = delay_ms;
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}
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static int mock_send_pre_vote_request(void *ctx, int peer_idx,
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uint64_t prospective_term)
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{
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(void)ctx;
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if (g_mock.send_pre_vote_request_count < 8)
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g_mock.pre_vote_sent_peers[g_mock.send_pre_vote_request_count] = peer_idx;
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if (peer_idx >= 0 && peer_idx < 8)
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g_mock.pre_vote_sent_term[peer_idx] = prospective_term;
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g_mock.last_pre_vote_peer_idx = peer_idx;
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g_mock.last_pre_vote_term = prospective_term;
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g_mock.send_pre_vote_request_count++;
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return 0;
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}
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static int mock_persist(void *ctx, uint64_t term, int voted_for)
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{
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(void)ctx;
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g_mock.persist_count++;
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g_mock.last_persist_term = term;
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g_mock.last_persist_voted_for = voted_for;
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return g_mock.persist_return_value;
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}
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static void mock_schedule_timeout(void *ctx, uint32_t delay_ms)
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{
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(void)ctx;
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g_mock.schedule_timeout_count++;
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g_mock.last_schedule_delay = delay_ms;
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}
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static int mock_vote_eligible(void *ctx, int from_idx, uint64_t term)
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{
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(void)ctx; (void)from_idx; (void)term;
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g_mock.vote_eligible_call_count++;
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return g_mock.vote_eligible_return_value;
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}
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static void mock_trace(void *ctx, const char *event, const char *detail)
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{
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(void)ctx; (void)detail;
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g_mock.trace_call_count++;
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if (event) {
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strncpy(g_mock.last_trace_event, event,
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sizeof(g_mock.last_trace_event) - 1);
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g_mock.last_trace_event[sizeof(g_mock.last_trace_event) - 1] = '\0';
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}
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}
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/* Build callbacks that record invocations in g_mock */
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static raft_callbacks_t make_mock_cbs(void)
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{
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raft_callbacks_t cbs;
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memset(&cbs, 0, sizeof(cbs));
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cbs.on_send_vote_request = mock_send_vote_request;
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cbs.on_become_leader = mock_become_leader;
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cbs.on_become_follower = mock_become_follower;
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cbs.on_persist = mock_persist;
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cbs.on_schedule_timeout = mock_schedule_timeout;
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cbs.on_cancel_timeout = mock_cancel_timeout;
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cbs.on_start_election_after_delay = mock_start_election_after_delay;
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cbs.on_send_pre_vote_request = mock_send_pre_vote_request;
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/* on_vote_eligible and on_trace left NULL — tests that need them set explicitly */
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return cbs;
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}
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/* ---------- helpers ---------- */
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/* Initialize a raft_state_t with mock callbacks; n_peers and self_idx configurable */
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static int init_node(raft_state_t *s, raft_callbacks_t *cbs, int n_peers, int self_idx)
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{
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raft_config_t cfg;
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memset(&cfg, 0, sizeof(cfg));
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cfg.n_peers = n_peers;
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cfg.self_idx = self_idx;
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cfg.election_timeout_ms = 1000;
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cfg.cbs = cbs;
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return raft_init(s, &cfg);
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}
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/* ---------- raft_init tests ---------- */
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/* raft_init with NULL required callback returns -EINVAL and does not modify s */
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static void test_raft_init_null_send_vote_request_returns_einval(void)
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{
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raft_state_t s;
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raft_callbacks_t cbs = make_full_cbs();
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raft_config_t cfg;
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/* canary: fill s with a non-zero sentinel so we can verify it's untouched */
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memset(&s, 0xAB, sizeof(s));
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cbs.on_send_vote_request = NULL; /* knock out a required callback */
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memset(&cfg, 0, sizeof(cfg));
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cfg.n_peers = 3;
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cfg.self_idx = 0;
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cfg.cbs = &cbs;
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cfg.ctx = NULL;
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int rc = raft_init(&s, &cfg);
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TEST_ASSERT_EQUAL_INT(-EINVAL, rc);
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/* s must be completely unchanged (canary check — spot-check first byte) */
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{
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unsigned char buf[sizeof(s)];
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memset(buf, 0xAB, sizeof(buf));
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TEST_ASSERT_EQUAL_MEMORY(buf, &s, sizeof(s));
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}
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}
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static void test_raft_init_null_become_leader_returns_einval(void)
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{
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raft_state_t s;
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raft_callbacks_t cbs = make_full_cbs();
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raft_config_t cfg;
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memset(&s, 0, sizeof(s));
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cbs.on_become_leader = NULL;
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memset(&cfg, 0, sizeof(cfg));
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cfg.n_peers = 3; cfg.self_idx = 0; cfg.cbs = &cbs;
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TEST_ASSERT_EQUAL_INT(-EINVAL, raft_init(&s, &cfg));
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}
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static void test_raft_init_null_become_follower_returns_einval(void)
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{
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raft_state_t s;
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raft_callbacks_t cbs = make_full_cbs();
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raft_config_t cfg;
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memset(&s, 0, sizeof(s));
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cbs.on_become_follower = NULL;
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memset(&cfg, 0, sizeof(cfg));
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cfg.n_peers = 3; cfg.self_idx = 0; cfg.cbs = &cbs;
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TEST_ASSERT_EQUAL_INT(-EINVAL, raft_init(&s, &cfg));
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}
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static void test_raft_init_null_persist_returns_einval(void)
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{
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raft_state_t s;
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raft_callbacks_t cbs = make_full_cbs();
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raft_config_t cfg;
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memset(&s, 0, sizeof(s));
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cbs.on_persist = NULL;
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memset(&cfg, 0, sizeof(cfg));
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cfg.n_peers = 3; cfg.self_idx = 0; cfg.cbs = &cbs;
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TEST_ASSERT_EQUAL_INT(-EINVAL, raft_init(&s, &cfg));
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}
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static void test_raft_init_null_schedule_timeout_returns_einval(void)
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{
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raft_state_t s;
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raft_callbacks_t cbs = make_full_cbs();
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raft_config_t cfg;
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memset(&s, 0, sizeof(s));
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cbs.on_schedule_timeout = NULL;
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memset(&cfg, 0, sizeof(cfg));
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cfg.n_peers = 3; cfg.self_idx = 0; cfg.cbs = &cbs;
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TEST_ASSERT_EQUAL_INT(-EINVAL, raft_init(&s, &cfg));
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}
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static void test_raft_init_null_cancel_timeout_returns_einval(void)
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{
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raft_state_t s;
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raft_callbacks_t cbs = make_full_cbs();
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raft_config_t cfg;
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memset(&s, 0, sizeof(s));
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cbs.on_cancel_timeout = NULL;
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memset(&cfg, 0, sizeof(cfg));
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cfg.n_peers = 3; cfg.self_idx = 0; cfg.cbs = &cbs;
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TEST_ASSERT_EQUAL_INT(-EINVAL, raft_init(&s, &cfg));
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}
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static void test_raft_init_null_start_election_after_delay_returns_einval(void)
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{
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raft_state_t s;
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raft_callbacks_t cbs = make_full_cbs();
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raft_config_t cfg;
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memset(&s, 0, sizeof(s));
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cbs.on_start_election_after_delay = NULL;
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memset(&cfg, 0, sizeof(cfg));
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cfg.n_peers = 3; cfg.self_idx = 0; cfg.cbs = &cbs;
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TEST_ASSERT_EQUAL_INT(-EINVAL, raft_init(&s, &cfg));
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}
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/* n_peers even (>1) → -EINVAL: even-sized clusters have no fault-tolerance
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* advantage over the next-smaller odd cluster; reject to prevent misconfiguration. */
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static void test_raft_init_even_peers_returns_einval(void)
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{
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raft_state_t s;
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raft_callbacks_t cbs = make_full_cbs();
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raft_config_t cfg;
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memset(&s, 0xAB, sizeof(s));
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/* n_peers=2: even, >1 → must fail */
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memset(&cfg, 0, sizeof(cfg));
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cfg.n_peers = 2;
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cfg.self_idx = 0;
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cfg.cbs = &cbs;
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TEST_ASSERT_EQUAL_INT(-EINVAL, raft_init(&s, &cfg));
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/* n_peers=4: even, >1 → must fail */
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cfg.n_peers = 4;
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TEST_ASSERT_EQUAL_INT(-EINVAL, raft_init(&s, &cfg));
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/* n_peers=1: single-node is always valid (odd by convention) */
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cfg.n_peers = 1;
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TEST_ASSERT_EQUAL_INT(0, raft_init(&s, &cfg));
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/* n_peers=3: odd, >1 → must succeed */
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memset(&cfg, 0, sizeof(cfg));
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cfg.n_peers = 3;
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cfg.self_idx = 0;
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cfg.cbs = &cbs;
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TEST_ASSERT_EQUAL_INT(0, raft_init(&s, &cfg));
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/* s must NOT be unchanged after valid inits above */
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TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
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}
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/* n_peers == 0 → -EINVAL */
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static void test_raft_init_zero_peers_returns_einval(void)
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{
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raft_state_t s;
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raft_callbacks_t cbs = make_full_cbs();
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raft_config_t cfg;
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memset(&s, 0xAB, sizeof(s));
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memset(&cfg, 0, sizeof(cfg));
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cfg.n_peers = 0;
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cfg.self_idx = 0;
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cfg.cbs = &cbs;
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TEST_ASSERT_EQUAL_INT(-EINVAL, raft_init(&s, &cfg));
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/* s must be unchanged */
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unsigned char buf[sizeof(s)];
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memset(buf, 0xAB, sizeof(buf));
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TEST_ASSERT_EQUAL_MEMORY(buf, &s, sizeof(s));
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}
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/* Successful init: check all fields */
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static void test_raft_init_success_fields(void)
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{
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raft_state_t s;
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raft_callbacks_t cbs = make_full_cbs();
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raft_config_t cfg;
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memset(&s, 0, sizeof(s));
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memset(&cfg, 0, sizeof(cfg));
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cfg.n_peers = 3;
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cfg.self_idx = 1;
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cfg.election_timeout_ms = 1500;
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cfg.my_priority = 2;
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cfg.initial_term = 7;
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cfg.initial_voted_for = -1;
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cfg.cbs = &cbs;
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cfg.ctx = (void *)0xDEADBEEF;
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int rc = raft_init(&s, &cfg);
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TEST_ASSERT_EQUAL_INT(0, rc);
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TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
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TEST_ASSERT_EQUAL_INT(3, s.n_peers);
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TEST_ASSERT_EQUAL_INT(1, s.self_idx);
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TEST_ASSERT_EQUAL_UINT32(1500, s.election_timeout_ms);
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TEST_ASSERT_EQUAL_INT(2, s.my_priority);
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TEST_ASSERT_EQUAL_UINT64(7, s.term);
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TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
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TEST_ASSERT_EQUAL_UINT64(0, s.voted_for_term);
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TEST_ASSERT_EQUAL_INT(0, s.votes_granted);
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TEST_ASSERT_EQUAL_INT(0, s.replies_received);
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TEST_ASSERT_EQUAL_INT(0, s.election_decided);
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/* cbs/ctx must be stored in raft_state_t for the state machine to fire callbacks */
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TEST_ASSERT_EQUAL_PTR(&cbs, s.cbs);
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TEST_ASSERT_EQUAL_PTR((void *)0xDEADBEEF, s.ctx);
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}
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/* election_timeout_ms == 0 → default 2000 */
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static void test_raft_init_default_election_timeout(void)
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{
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raft_state_t s;
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raft_callbacks_t cbs = make_full_cbs();
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raft_config_t cfg;
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memset(&s, 0, sizeof(s));
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memset(&cfg, 0, sizeof(cfg));
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cfg.n_peers = 3;
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cfg.self_idx = 0;
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cfg.election_timeout_ms = 0; /* trigger default */
|
||
cfg.cbs = &cbs;
|
||
|
||
int rc = raft_init(&s, &cfg);
|
||
TEST_ASSERT_EQUAL_INT(0, rc);
|
||
TEST_ASSERT_EQUAL_UINT32(2000, s.election_timeout_ms);
|
||
}
|
||
|
||
/* optional callbacks (on_vote_eligible, on_trace) may be NULL — must succeed */
|
||
static void test_raft_init_optional_callbacks_null_succeeds(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_full_cbs();
|
||
raft_config_t cfg;
|
||
|
||
memset(&s, 0, sizeof(s));
|
||
cbs.on_vote_eligible = NULL;
|
||
cbs.on_trace = NULL;
|
||
|
||
memset(&cfg, 0, sizeof(cfg));
|
||
cfg.n_peers = 3;
|
||
cfg.self_idx = 0;
|
||
cfg.cbs = &cbs;
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, raft_init(&s, &cfg));
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
}
|
||
|
||
/* ---------- raft_start_election tests (task 3.2) ---------- */
|
||
|
||
/*
|
||
* test_start_election_from_follower_3node
|
||
*
|
||
* 3-node cluster (self=0). raft_start_election transitions to CANDIDATE,
|
||
* increments term, records self-vote, fires on_persist(new_term, self_idx),
|
||
* fires on_send_vote_request for each peer != self_idx (peers 1 and 2),
|
||
* fires on_schedule_timeout once, returns RAFT_OK.
|
||
*/
|
||
static void test_start_election_from_follower_3node(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_UINT64(0, s.term);
|
||
|
||
int rc = raft_start_election(&s);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, rc);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, s.role);
|
||
TEST_ASSERT_EQUAL_UINT64(1, s.term);
|
||
TEST_ASSERT_EQUAL_INT(0, s.self_idx);
|
||
TEST_ASSERT_EQUAL_INT(0, s.voted_for); /* voted_for == self_idx */
|
||
TEST_ASSERT_EQUAL_UINT64(1, s.voted_for_term); /* voted_for_term == new term */
|
||
TEST_ASSERT_EQUAL_INT(1, s.votes_granted); /* self-vote counted */
|
||
TEST_ASSERT_EQUAL_INT(0, s.replies_received);
|
||
TEST_ASSERT_EQUAL_INT(0, s.election_decided);
|
||
|
||
/* on_persist must fire once with (new_term=1, self_idx=0) */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.persist_count);
|
||
TEST_ASSERT_EQUAL_UINT64(1, g_mock.last_persist_term);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.last_persist_voted_for);
|
||
|
||
/* on_send_vote_request must fire for peers 1 and 2 (not self=0) */
|
||
TEST_ASSERT_EQUAL_INT(2, g_mock.send_vote_request_count);
|
||
/* Both sends must use the new term */
|
||
TEST_ASSERT_EQUAL_UINT64(1, g_mock.last_send_term);
|
||
/* Verify neither sent peer is self_idx=0 */
|
||
{
|
||
int i;
|
||
for (i = 0; i < g_mock.send_vote_request_count; i++) {
|
||
TEST_ASSERT_NOT_EQUAL(0, g_mock.sent_peers[i]);
|
||
}
|
||
}
|
||
|
||
/* on_schedule_timeout must fire exactly once */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.schedule_timeout_count);
|
||
TEST_ASSERT_EQUAL_UINT32(1000, g_mock.last_schedule_delay);
|
||
|
||
/* on_become_leader must NOT fire (multi-node path) */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
}
|
||
|
||
/*
|
||
* test_start_election_single_node
|
||
*
|
||
* 1-node cluster (self=0). raft_start_election shortcircuits to LEADER,
|
||
* fires on_persist then on_become_leader, returns RAFT_ELECTED_IMMEDIATELY.
|
||
* No on_send_vote_request or on_schedule_timeout calls.
|
||
*/
|
||
static void test_start_election_single_node(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 1, 0));
|
||
|
||
int rc = raft_start_election(&s);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_ELECTED_IMMEDIATELY, rc);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, s.role);
|
||
TEST_ASSERT_EQUAL_UINT64(1, s.term);
|
||
TEST_ASSERT_EQUAL_INT(0, s.voted_for); /* self-vote */
|
||
TEST_ASSERT_EQUAL_INT(1, s.election_decided);
|
||
|
||
/* on_persist fires once with (term=1, self_idx=0) */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.persist_count);
|
||
TEST_ASSERT_EQUAL_UINT64(1, g_mock.last_persist_term);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.last_persist_voted_for);
|
||
|
||
/* on_become_leader fires once with term=1 */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.become_leader_count);
|
||
TEST_ASSERT_EQUAL_UINT64(1, g_mock.last_become_leader_term);
|
||
|
||
/* on_send_vote_request must NOT fire */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.send_vote_request_count);
|
||
|
||
/* on_schedule_timeout must NOT fire */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.schedule_timeout_count);
|
||
}
|
||
|
||
/*
|
||
* test_start_election_already_candidate
|
||
*
|
||
* Call raft_start_election once (become CANDIDATE), then call again.
|
||
* Second call must return -EALREADY and leave state completely unchanged.
|
||
*/
|
||
static void test_start_election_already_candidate(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 1));
|
||
|
||
/* First election — becomes CANDIDATE */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, raft_start_election(&s));
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, s.role);
|
||
uint64_t term_after_first = s.term;
|
||
|
||
/* Snapshot the state before the second call */
|
||
int saved_voted_for = s.voted_for;
|
||
int saved_votes_granted = s.votes_granted;
|
||
int saved_replies_recvd = s.replies_received;
|
||
int saved_election_dec = s.election_decided;
|
||
|
||
reset_mock();
|
||
|
||
/* Second call must be rejected */
|
||
int rc = raft_start_election(&s);
|
||
TEST_ASSERT_EQUAL_INT(-EALREADY, rc);
|
||
|
||
/* State must be unchanged */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, s.role);
|
||
TEST_ASSERT_EQUAL_UINT64(term_after_first, s.term);
|
||
TEST_ASSERT_EQUAL_INT(saved_voted_for, s.voted_for);
|
||
TEST_ASSERT_EQUAL_INT(saved_votes_granted, s.votes_granted);
|
||
TEST_ASSERT_EQUAL_INT(saved_replies_recvd, s.replies_received);
|
||
TEST_ASSERT_EQUAL_INT(saved_election_dec, s.election_decided);
|
||
|
||
/* No callbacks must have fired on the second call */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.send_vote_request_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.schedule_timeout_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
}
|
||
|
||
/*
|
||
* test_start_election_already_leader
|
||
*
|
||
* Manually set role=RAFT_LEADER, then call raft_start_election.
|
||
* Must return -EALREADY without modifying any state or firing any callback.
|
||
*/
|
||
static void test_start_election_already_leader(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 2));
|
||
|
||
/* Manually elevate to LEADER */
|
||
s.role = RAFT_LEADER;
|
||
s.term = 5;
|
||
|
||
int rc = raft_start_election(&s);
|
||
TEST_ASSERT_EQUAL_INT(-EALREADY, rc);
|
||
|
||
/* All state must be unchanged */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, s.role);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
|
||
/* No callbacks must fire */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.send_vote_request_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.schedule_timeout_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
}
|
||
|
||
/* ---------- raft_on_vote_request tests (task 3.3) ---------- */
|
||
|
||
/*
|
||
* Helper: init a 3-node node with mock callbacks (including trace).
|
||
* term, role, voted_for can be set after init.
|
||
*/
|
||
static int init_vote_node(raft_state_t *s, raft_callbacks_t *cbs,
|
||
int n_peers, int self_idx, uint64_t initial_term)
|
||
{
|
||
raft_config_t cfg;
|
||
memset(&cfg, 0, sizeof(cfg));
|
||
cfg.n_peers = n_peers;
|
||
cfg.self_idx = self_idx;
|
||
cfg.election_timeout_ms = 1000;
|
||
cfg.initial_term = initial_term;
|
||
cfg.initial_voted_for = -1;
|
||
cfg.cbs = cbs;
|
||
return raft_init(s, &cfg);
|
||
}
|
||
|
||
/*
|
||
* test_vote_req_stale_term
|
||
*
|
||
* Node at term=5, receives request with term=3.
|
||
* Expected: RAFT_DENY, *reply_term=5, state unchanged,
|
||
* on_trace fired with "vote_denied_stale_term".
|
||
*/
|
||
static void test_vote_req_stale_term(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
/* Confirm starting state */
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 3, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(5, reply_term);
|
||
|
||
/* State must be unchanged */
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
|
||
|
||
/* on_trace must fire with "vote_denied_stale_term" */
|
||
TEST_ASSERT_GREATER_THAN_INT(0, g_mock.trace_call_count);
|
||
TEST_ASSERT_EQUAL_STRING("vote_denied_stale_term", g_mock.last_trace_event);
|
||
|
||
/* on_persist must NOT fire */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
}
|
||
|
||
/*
|
||
* test_vote_req_higher_term_updates_state
|
||
*
|
||
* Node at term=2, receives request with term=5 (higher).
|
||
* Expected: s->term updated to 5, voted_for cleared to -1, role=FOLLOWER.
|
||
* Since voted_for is unset and persist succeeds: RAFT_GRANT.
|
||
* reply_term = 5.
|
||
*/
|
||
static void test_vote_req_higher_term_updates_state(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 2));
|
||
/* Simulate node was CANDIDATE in term=2 */
|
||
s.role = RAFT_CANDIDATE;
|
||
s.voted_for = 0; /* voted for self */
|
||
s.voted_for_term = 2;
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 5, &reply_term);
|
||
|
||
/* Term upgrade must happen: term updated, role stepped down */
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
|
||
/* Then grant because voted_for is cleared and persist succeeds */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(5, reply_term);
|
||
|
||
/* on_persist must fire once */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.persist_count);
|
||
TEST_ASSERT_EQUAL_UINT64(5, g_mock.last_persist_term);
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.last_persist_voted_for);
|
||
|
||
/* voted_for set on grant */
|
||
TEST_ASSERT_EQUAL_INT(1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.voted_for_term);
|
||
}
|
||
|
||
/*
|
||
* test_vote_req_same_term_already_voted_different
|
||
*
|
||
* Node at term=5, voted_for=1, voted_for_term=5.
|
||
* Receives request from idx=2 at term=5.
|
||
* Expected: RAFT_DENY, "vote_denied_already_voted" trace.
|
||
*/
|
||
static void test_vote_req_same_term_already_voted_different(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
s.voted_for = 1;
|
||
s.voted_for_term = 5;
|
||
|
||
int rc = raft_on_vote_request(&s, 2, 5, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(5, reply_term);
|
||
|
||
/* State: voted_for still 1 (not 2), term unchanged */
|
||
TEST_ASSERT_EQUAL_INT(1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
|
||
/* on_trace fires with already_voted */
|
||
TEST_ASSERT_GREATER_THAN_INT(0, g_mock.trace_call_count);
|
||
TEST_ASSERT_EQUAL_STRING("vote_denied_already_voted", g_mock.last_trace_event);
|
||
|
||
/* on_persist must NOT fire */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
}
|
||
|
||
/*
|
||
* test_vote_req_same_term_idempotent_same_candidate
|
||
*
|
||
* Node at term=5, voted_for=1, voted_for_term=5.
|
||
* Receives request from idx=1 at term=5 (same candidate, same term).
|
||
* Expected: idempotent re-grant → RAFT_GRANT, voted_for still 1.
|
||
*/
|
||
static void test_vote_req_same_term_idempotent_same_candidate(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
s.voted_for = 1;
|
||
s.voted_for_term = 5;
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 5, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(5, reply_term);
|
||
|
||
/* voted_for still 1 */
|
||
TEST_ASSERT_EQUAL_INT(1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.voted_for_term);
|
||
|
||
/* on_persist must fire once for the re-grant */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.persist_count);
|
||
}
|
||
|
||
/*
|
||
* test_vote_req_leader_denies
|
||
*
|
||
* Node is RAFT_LEADER at term=5, receives request at term=5 (same term, no upgrade).
|
||
* Expected: RAFT_DENY ("vote_denied_role" trace), role stays LEADER.
|
||
*/
|
||
static void test_vote_req_leader_denies(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
s.role = RAFT_LEADER;
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 5, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(5, reply_term);
|
||
|
||
/* Role gate fires: still LEADER (term==request term, no upgrade) */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, s.role);
|
||
|
||
/* on_trace fires with "vote_denied_role" */
|
||
TEST_ASSERT_GREATER_THAN_INT(0, g_mock.trace_call_count);
|
||
TEST_ASSERT_EQUAL_STRING("vote_denied_role", g_mock.last_trace_event);
|
||
|
||
/* on_persist must NOT fire */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
}
|
||
|
||
/*
|
||
* test_vote_req_on_vote_eligible_denies
|
||
*
|
||
* on_vote_eligible returns 0 → RAFT_DENY, voted_for unchanged,
|
||
* "vote_denied_freshness" trace fires.
|
||
*/
|
||
static void test_vote_req_on_vote_eligible_denies(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
cbs.on_vote_eligible = mock_vote_eligible;
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
g_mock.vote_eligible_return_value = 0; /* deny */
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 5, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(5, reply_term);
|
||
|
||
/* voted_for must be unchanged */
|
||
TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
|
||
|
||
/* on_vote_eligible must have been called */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.vote_eligible_call_count);
|
||
|
||
/* on_trace fires with "vote_denied_freshness" */
|
||
TEST_ASSERT_GREATER_THAN_INT(0, g_mock.trace_call_count);
|
||
TEST_ASSERT_EQUAL_STRING("vote_denied_freshness", g_mock.last_trace_event);
|
||
|
||
/* on_persist must NOT fire */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
}
|
||
|
||
/*
|
||
* test_vote_req_on_vote_eligible_grants
|
||
*
|
||
* on_vote_eligible returns 1 and persist succeeds → RAFT_GRANT, voted_for set.
|
||
*/
|
||
static void test_vote_req_on_vote_eligible_grants(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
cbs.on_vote_eligible = mock_vote_eligible;
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
g_mock.vote_eligible_return_value = 1; /* grant */
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 5, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(5, reply_term);
|
||
|
||
/* voted_for must be set */
|
||
TEST_ASSERT_EQUAL_INT(1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.voted_for_term);
|
||
|
||
/* on_vote_eligible called once */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.vote_eligible_call_count);
|
||
|
||
/* on_persist called once */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.persist_count);
|
||
|
||
/* on_trace fires "vote_granted" */
|
||
TEST_ASSERT_GREATER_THAN_INT(0, g_mock.trace_call_count);
|
||
TEST_ASSERT_EQUAL_STRING("vote_granted", g_mock.last_trace_event);
|
||
}
|
||
|
||
/*
|
||
* test_vote_req_on_vote_eligible_null
|
||
*
|
||
* on_vote_eligible is NULL → treated as eligible, grant if persist ok.
|
||
*/
|
||
static void test_vote_req_on_vote_eligible_null(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
/* on_vote_eligible left NULL in make_mock_cbs */
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 5, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(5, reply_term);
|
||
|
||
/* voted_for must be set */
|
||
TEST_ASSERT_EQUAL_INT(1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.voted_for_term);
|
||
|
||
/* on_persist called once */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.persist_count);
|
||
}
|
||
|
||
/*
|
||
* test_vote_req_persist_fails
|
||
*
|
||
* on_persist returns non-zero → RAFT_DENY, voted_for unchanged.
|
||
*/
|
||
static void test_vote_req_persist_fails(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
g_mock.persist_return_value = -1; /* fail */
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 5, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(5, reply_term);
|
||
|
||
/* voted_for must NOT be updated */
|
||
TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(0, s.voted_for_term);
|
||
|
||
/* on_persist called once (it ran, but failed) */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.persist_count);
|
||
}
|
||
|
||
/*
|
||
* test_vote_req_reply_term_always_set
|
||
*
|
||
* Verify that *reply_term == s->term on every return path by testing
|
||
* several scenarios and checking reply_term each time.
|
||
*/
|
||
static void test_vote_req_reply_term_always_set(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term;
|
||
|
||
/* Path 1: stale term deny */
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 7));
|
||
reply_term = 0;
|
||
raft_on_vote_request(&s, 1, 3, &reply_term);
|
||
TEST_ASSERT_EQUAL_UINT64(s.term, reply_term); /* must equal current term=7 */
|
||
|
||
/* Path 2: term upgrade + grant */
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 3));
|
||
reply_term = 0;
|
||
raft_on_vote_request(&s, 1, 7, &reply_term);
|
||
TEST_ASSERT_EQUAL_UINT64(s.term, reply_term); /* must equal upgraded term=7 */
|
||
|
||
/* Path 3: already voted for different — deny */
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
s.voted_for = 1; s.voted_for_term = 5;
|
||
reply_term = 0;
|
||
raft_on_vote_request(&s, 2, 5, &reply_term);
|
||
TEST_ASSERT_EQUAL_UINT64(s.term, reply_term); /* must equal 5 */
|
||
|
||
/* Path 4: persist fails — deny */
|
||
g_mock.persist_return_value = -1;
|
||
reset_mock();
|
||
g_mock.persist_return_value = -1;
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
reply_term = 0;
|
||
raft_on_vote_request(&s, 1, 5, &reply_term);
|
||
TEST_ASSERT_EQUAL_UINT64(s.term, reply_term); /* must equal 5 */
|
||
}
|
||
|
||
/* ---------- raft_on_vote_reply tests (task 3.4) ---------- */
|
||
|
||
/*
|
||
* test_vote_reply_higher_term_steps_down
|
||
*
|
||
* Node is CANDIDATE at term=2. Receives reply with term=5 (higher).
|
||
* Expected: RAFT_BECAME_FOLLOWER, role=FOLLOWER, term=5, election_decided=1,
|
||
* on_become_follower fired with (5, -1), on_cancel_timeout fired once.
|
||
*/
|
||
static void test_vote_reply_higher_term_steps_down(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
/* Manually put node into CANDIDATE state at term=2 */
|
||
s.role = RAFT_CANDIDATE;
|
||
s.term = 2;
|
||
s.votes_granted = 1;
|
||
s.replies_received = 0;
|
||
s.election_decided = 0;
|
||
|
||
int rc = raft_on_vote_reply(&s, 1, 0, 5);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_BECAME_FOLLOWER, rc);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(1, s.election_decided);
|
||
|
||
/* on_become_follower must fire once with (term=5, leader_idx=-1) */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.become_follower_count);
|
||
TEST_ASSERT_EQUAL_UINT64(5, g_mock.last_become_follower_term);
|
||
TEST_ASSERT_EQUAL_INT(-1, g_mock.last_become_follower_leader_idx);
|
||
|
||
/* on_cancel_timeout must fire once */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.cancel_timeout_count);
|
||
|
||
/* on_become_leader must NOT fire */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
}
|
||
|
||
/*
|
||
* test_vote_reply_noop_after_decided
|
||
*
|
||
* election_decided=1 already set. Call raft_on_vote_reply.
|
||
* Expected: RAFT_PENDING, no callbacks fire.
|
||
*/
|
||
static void test_vote_reply_noop_after_decided(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.role = RAFT_CANDIDATE;
|
||
s.term = 2;
|
||
s.votes_granted = 1;
|
||
s.replies_received = 0;
|
||
s.election_decided = 1; /* already decided */
|
||
|
||
int rc = raft_on_vote_reply(&s, 1, 1, 2);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PENDING, rc);
|
||
|
||
/* No callbacks must fire */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_follower_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.cancel_timeout_count);
|
||
}
|
||
|
||
/*
|
||
* test_vote_reply_quorum_3node_1grant
|
||
*
|
||
* 3-node cluster (quorum=2). Node is CANDIDATE with votes_granted=1 (self-vote).
|
||
* One peer grant arrives → votes_granted=2 >= quorum=2.
|
||
* Expected: RAFT_BECAME_LEADER, role=LEADER, election_decided=1,
|
||
* on_become_leader fired, on_cancel_timeout fired.
|
||
*/
|
||
static void test_vote_reply_quorum_3node_1grant(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
/* Simulate state after raft_start_election: CANDIDATE, self-vote counted */
|
||
s.role = RAFT_CANDIDATE;
|
||
s.term = 1;
|
||
s.votes_granted = 1;
|
||
s.replies_received = 0;
|
||
s.election_decided = 0;
|
||
|
||
/* One peer grants */
|
||
int rc = raft_on_vote_reply(&s, 1, 1, 1);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_BECAME_LEADER, rc);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(1, s.election_decided);
|
||
TEST_ASSERT_EQUAL_INT(2, s.votes_granted);
|
||
|
||
/* on_become_leader must fire once with the current term */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.become_leader_count);
|
||
TEST_ASSERT_EQUAL_UINT64(1, g_mock.last_become_leader_term);
|
||
|
||
/* on_cancel_timeout must fire once */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.cancel_timeout_count);
|
||
|
||
/* on_become_follower must NOT fire */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_follower_count);
|
||
}
|
||
|
||
/*
|
||
* test_vote_reply_no_quorum_all_replied_3node
|
||
*
|
||
* 3-node cluster. Node starts election (votes_granted=1, replies_received=0).
|
||
* Both peers deny. After second deny: replies_received=2 == n_peers-1=2,
|
||
* votes_granted=1 < quorum=2 → RAFT_BECAME_FOLLOWER.
|
||
*/
|
||
static void test_vote_reply_no_quorum_all_replied_3node(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.role = RAFT_CANDIDATE;
|
||
s.term = 1;
|
||
s.votes_granted = 1;
|
||
s.replies_received = 0;
|
||
s.election_decided = 0;
|
||
|
||
/* First deny: replies_received=1, not yet all replied */
|
||
int rc1 = raft_on_vote_reply(&s, 1, 0, 1);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PENDING, rc1);
|
||
TEST_ASSERT_EQUAL_INT(1, s.replies_received);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_follower_count);
|
||
|
||
/* Second deny: replies_received=2 == n_peers-1=2 → step down */
|
||
int rc2 = raft_on_vote_reply(&s, 2, 0, 1);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_BECAME_FOLLOWER, rc2);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(1, s.election_decided);
|
||
|
||
/* on_become_follower must fire once */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.become_follower_count);
|
||
TEST_ASSERT_EQUAL_UINT64(1, g_mock.last_become_follower_term);
|
||
TEST_ASSERT_EQUAL_INT(-1, g_mock.last_become_follower_leader_idx);
|
||
|
||
/* on_become_leader must NOT fire */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
|
||
/* on_cancel_timeout must NOT fire for all-replied-no-quorum (only term-upgrade and quorum paths cancel) */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.cancel_timeout_count);
|
||
}
|
||
|
||
/*
|
||
* test_vote_reply_quorum_5node
|
||
*
|
||
* 5-node cluster (quorum=3). Node starts election (votes_granted=1).
|
||
* Two grants arrive → votes_granted=3 = quorum=3 → RAFT_BECAME_LEADER.
|
||
*/
|
||
static void test_vote_reply_quorum_5node(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 5, 0));
|
||
s.role = RAFT_CANDIDATE;
|
||
s.term = 1;
|
||
s.votes_granted = 1;
|
||
s.replies_received = 0;
|
||
s.election_decided = 0;
|
||
|
||
/* First grant: votes_granted=2, quorum=3 → still pending */
|
||
int rc1 = raft_on_vote_reply(&s, 1, 1, 1);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PENDING, rc1);
|
||
TEST_ASSERT_EQUAL_INT(2, s.votes_granted);
|
||
|
||
/* Second grant: votes_granted=3 = quorum → leader */
|
||
int rc2 = raft_on_vote_reply(&s, 2, 1, 1);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_BECAME_LEADER, rc2);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(1, s.election_decided);
|
||
TEST_ASSERT_EQUAL_INT(3, s.votes_granted);
|
||
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.become_leader_count);
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.cancel_timeout_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_follower_count);
|
||
}
|
||
|
||
/*
|
||
* test_vote_reply_pending_waiting
|
||
*
|
||
* 3-node cluster. Node starts election (votes_granted=1, replies_received=0).
|
||
* One deny arrives: replies_received=1, n_peers-1=2 → not all replied yet.
|
||
* Expected: RAFT_PENDING, no role change, no callbacks.
|
||
*/
|
||
static void test_vote_reply_pending_waiting(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.role = RAFT_CANDIDATE;
|
||
s.term = 1;
|
||
s.votes_granted = 1;
|
||
s.replies_received = 0;
|
||
s.election_decided = 0;
|
||
|
||
/* One deny: replies_received=1, n_peers-1=2 → still waiting */
|
||
int rc = raft_on_vote_reply(&s, 1, 0, 1);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PENDING, rc);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, s.role);
|
||
TEST_ASSERT_EQUAL_INT(0, s.election_decided);
|
||
TEST_ASSERT_EQUAL_INT(1, s.replies_received);
|
||
TEST_ASSERT_EQUAL_INT(1, s.votes_granted); /* unchanged */
|
||
|
||
/* No role-change callbacks */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_follower_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.cancel_timeout_count);
|
||
}
|
||
|
||
/* ---------- raft_on_election_timeout tests (task 3.5) ---------- */
|
||
|
||
/*
|
||
* test_election_timeout_undecided
|
||
*
|
||
* Node is CANDIDATE, election_decided=0.
|
||
* raft_on_election_timeout must:
|
||
* - set role=FOLLOWER
|
||
* - set election_decided=1
|
||
* - fire on_become_follower once
|
||
* - fire on_cancel_timeout once
|
||
* - trace "election_timeout"
|
||
*/
|
||
static void test_election_timeout_undecided(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.role = RAFT_CANDIDATE;
|
||
s.term = 2;
|
||
s.election_decided = 0;
|
||
|
||
int become_follower_before = g_mock.become_follower_count;
|
||
|
||
raft_on_election_timeout(&s);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(1, s.election_decided);
|
||
|
||
/* on_become_follower fired once (with current term, leader_idx=-1) */
|
||
TEST_ASSERT_EQUAL_INT(become_follower_before + 1, g_mock.become_follower_count);
|
||
TEST_ASSERT_EQUAL_UINT64(2, g_mock.last_become_follower_term);
|
||
TEST_ASSERT_EQUAL_INT(-1, g_mock.last_become_follower_leader_idx);
|
||
|
||
/* on_cancel_timeout fired once */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.cancel_timeout_count);
|
||
|
||
/* trace fired with "election_timeout" */
|
||
TEST_ASSERT_GREATER_THAN_INT(0, g_mock.trace_call_count);
|
||
TEST_ASSERT_EQUAL_STRING("election_timeout", g_mock.last_trace_event);
|
||
}
|
||
|
||
/*
|
||
* test_election_timeout_already_decided
|
||
*
|
||
* election_decided=1 already set (election outcome already fired).
|
||
* raft_on_election_timeout must:
|
||
* - fire on_cancel_timeout once (stale timer cleanup, Req 6.3)
|
||
* - NOT fire an additional on_become_follower
|
||
* - trace "election_timeout_noop"
|
||
*/
|
||
static void test_election_timeout_already_decided(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.role = RAFT_CANDIDATE;
|
||
s.term = 2;
|
||
s.election_decided = 1; /* already decided */
|
||
|
||
/* Snapshot become_follower_count before the call */
|
||
int become_follower_before = g_mock.become_follower_count;
|
||
|
||
raft_on_election_timeout(&s);
|
||
|
||
/* on_cancel_timeout must fire once (stale timer cleanup, Req 6.3) */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.cancel_timeout_count);
|
||
|
||
/* on_become_follower must NOT have fired an additional time */
|
||
TEST_ASSERT_EQUAL_INT(become_follower_before, g_mock.become_follower_count);
|
||
|
||
/* trace fired with "election_timeout_noop" */
|
||
TEST_ASSERT_GREATER_THAN_INT(0, g_mock.trace_call_count);
|
||
TEST_ASSERT_EQUAL_STRING("election_timeout_noop", g_mock.last_trace_event);
|
||
}
|
||
|
||
/* ---------- raft_on_leader_lost tests (task 3.5) ---------- */
|
||
|
||
/*
|
||
* test_leader_lost_clears_voted_for
|
||
*
|
||
* Node had voted_for=1. raft_on_leader_lost must:
|
||
* - set voted_for=-1
|
||
* - set role=FOLLOWER
|
||
* - fire on_start_election_after_delay with delay = my_priority * election_timeout_ms
|
||
* - trace "leader_lost"
|
||
*/
|
||
static void test_leader_lost_clears_voted_for(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
raft_config_t cfg;
|
||
memset(&cfg, 0, sizeof(cfg));
|
||
cfg.n_peers = 3;
|
||
cfg.self_idx = 0;
|
||
cfg.election_timeout_ms = 500;
|
||
cfg.my_priority = 2;
|
||
cfg.initial_voted_for = -1;
|
||
cfg.cbs = &cbs;
|
||
TEST_ASSERT_EQUAL_INT(0, raft_init(&s, &cfg));
|
||
|
||
s.voted_for = 1;
|
||
s.role = RAFT_FOLLOWER;
|
||
|
||
raft_on_leader_lost(&s);
|
||
|
||
TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
|
||
/* on_start_election_after_delay fired once with delay = priority * timeout */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.start_election_after_delay_count);
|
||
TEST_ASSERT_EQUAL_UINT32(2 * 500, g_mock.last_start_election_delay);
|
||
|
||
/* trace fired with "leader_lost" */
|
||
TEST_ASSERT_GREATER_THAN_INT(0, g_mock.trace_call_count);
|
||
TEST_ASSERT_EQUAL_STRING("leader_lost", g_mock.last_trace_event);
|
||
}
|
||
|
||
/* ---------- raft_check_and_start_election tests (task 3.5) ---------- */
|
||
|
||
/*
|
||
* test_check_and_start_voted_for_other
|
||
*
|
||
* voted_for=1, self_idx=0 (voted for a different candidate).
|
||
* Must return RAFT_SKIP_ELECTION, role stays FOLLOWER, no election started.
|
||
* Trace "jitter_skip" fires.
|
||
*/
|
||
static void test_check_and_start_voted_for_other(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.voted_for = 1; /* voted for peer 1, not self (0) */
|
||
s.role = RAFT_FOLLOWER;
|
||
|
||
int rc = raft_check_and_start_election(&s);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_SKIP_ELECTION, rc);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
|
||
/* No election RPCs must have fired */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.send_vote_request_count);
|
||
|
||
/* trace fired with "jitter_skip" */
|
||
TEST_ASSERT_GREATER_THAN_INT(0, g_mock.trace_call_count);
|
||
TEST_ASSERT_EQUAL_STRING("jitter_skip", g_mock.last_trace_event);
|
||
}
|
||
|
||
/*
|
||
* test_check_and_start_not_voted
|
||
*
|
||
* voted_for==-1 (no vote cast yet).
|
||
* Must call raft_start_election internally and return RAFT_ELECTION_STARTED.
|
||
* role becomes CANDIDATE (3-node cluster).
|
||
*/
|
||
static void test_check_and_start_not_voted(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.voted_for = -1;
|
||
s.role = RAFT_FOLLOWER;
|
||
|
||
int rc = raft_check_and_start_election(&s);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_ELECTION_STARTED, rc);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, s.role);
|
||
|
||
/* raft_start_election must have fired vote requests */
|
||
TEST_ASSERT_GREATER_THAN_INT(0, g_mock.send_vote_request_count);
|
||
}
|
||
|
||
/*
|
||
* test_check_and_start_voted_for_self
|
||
*
|
||
* voted_for==self_idx (we previously voted for ourselves — this means
|
||
* we already started an election, so start again to re-enter candidacy).
|
||
* Must return RAFT_ELECTION_STARTED, not RAFT_SKIP_ELECTION.
|
||
*/
|
||
static void test_check_and_start_voted_for_self(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.voted_for = 0; /* voted for self (self_idx=0) */
|
||
s.role = RAFT_FOLLOWER;
|
||
|
||
int rc = raft_check_and_start_election(&s);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_ELECTION_STARTED, rc);
|
||
}
|
||
|
||
/* ---------- raft_snapshot tests ---------- */
|
||
|
||
static void test_raft_snapshot_returns_current_state(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_snapshot_t snap;
|
||
raft_callbacks_t cbs = make_full_cbs();
|
||
raft_config_t cfg;
|
||
|
||
memset(&s, 0, sizeof(s));
|
||
memset(&cfg, 0, sizeof(cfg));
|
||
cfg.n_peers = 3;
|
||
cfg.self_idx = 0;
|
||
cfg.initial_term = 5;
|
||
cfg.initial_voted_for = 1;
|
||
cfg.cbs = &cbs;
|
||
|
||
int rc = raft_init(&s, &cfg);
|
||
TEST_ASSERT_EQUAL_INT(0, rc);
|
||
|
||
/* manually set a few fields to distinguish from zero defaults */
|
||
s.votes_granted = 2;
|
||
s.election_decided = 1;
|
||
s.voted_for_term = 5;
|
||
|
||
memset(&snap, 0xFF, sizeof(snap)); /* canary */
|
||
raft_snapshot(&s, &snap);
|
||
|
||
TEST_ASSERT_EQUAL_UINT64(5, snap.term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, snap.role);
|
||
TEST_ASSERT_EQUAL_INT(1, snap.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(5, snap.voted_for_term);
|
||
TEST_ASSERT_EQUAL_INT(2, snap.votes_granted);
|
||
TEST_ASSERT_EQUAL_INT(1, snap.election_decided);
|
||
}
|
||
|
||
/* ---------- simulator tests (task 4.1) ---------- */
|
||
|
||
#ifdef XCE_TESTING
|
||
|
||
/*
|
||
* test_sim_init_3node
|
||
*
|
||
* raft_sim_init(c, 3, 2000) returns 0.
|
||
* All 3 nodes have: role=FOLLOWER, term=0, voted_for=-1.
|
||
* leader_count=0, pending_count=0.
|
||
*/
|
||
static void test_sim_init_3node(void)
|
||
{
|
||
raft_sim_cluster_t c;
|
||
memset(&c, 0xFF, sizeof(c)); /* canary — force all fields to non-zero */
|
||
|
||
int rc = raft_sim_init(&c, 3, 2000);
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, rc);
|
||
TEST_ASSERT_EQUAL_INT(3, c.n);
|
||
TEST_ASSERT_EQUAL_INT(0, c.leader_count);
|
||
TEST_ASSERT_EQUAL_INT(0, c.pending_count);
|
||
|
||
for (int i = 0; i < 3; i++) {
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, c.nodes[i].state.role);
|
||
TEST_ASSERT_EQUAL_UINT64(0, c.nodes[i].state.term);
|
||
TEST_ASSERT_EQUAL_INT(-1, c.nodes[i].state.voted_for);
|
||
TEST_ASSERT_EQUAL_INT(i, c.nodes[i].idx);
|
||
TEST_ASSERT_EQUAL_INT(0, c.nodes[i].partition);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* test_sim_trace_buf
|
||
*
|
||
* After raft_sim_init, calling raft_start_election on node 0 (which has
|
||
* on_trace wired) must append at least one event to node 0's trace_buf.
|
||
*/
|
||
static void test_sim_trace_buf(void)
|
||
{
|
||
raft_sim_cluster_t c;
|
||
memset(&c, 0, sizeof(c));
|
||
|
||
int rc = raft_sim_init(&c, 3, 2000);
|
||
TEST_ASSERT_EQUAL_INT(0, rc);
|
||
|
||
/* trace_buf must start empty */
|
||
TEST_ASSERT_EQUAL_INT(0, c.nodes[0].trace_len);
|
||
|
||
/* Start election on node 0 — on_trace wired in raft_sim_init will write to trace_buf */
|
||
raft_start_election(&c.nodes[0].state);
|
||
|
||
/* At least one trace event must have been written */
|
||
TEST_ASSERT_GREATER_THAN_INT(0, c.nodes[0].trace_len);
|
||
}
|
||
|
||
/*
|
||
* test_sim_3node_election_one_leader (task 4.2)
|
||
*
|
||
* Node 0 starts the election alone (priority=0, highest priority).
|
||
* Nodes 1 and 2 have not yet voted, so they grant node 0's request.
|
||
* After delivering pending RPCs, node 0 reaches quorum and becomes LEADER.
|
||
*
|
||
* Steps:
|
||
* 1. raft_sim_init(c, 3, 2000)
|
||
* 2. raft_start_election only for node 0 → buffers 2 vote-request RPCs
|
||
* 3. raft_sim_deliver_pending(c) → nodes 1 and 2 grant; node 0 wins
|
||
* 4. Assert c->leader_count == 1 (exactly one LEADER, no split brain)
|
||
* 5. Assert node 0 is RAFT_LEADER, nodes 1 and 2 are RAFT_FOLLOWER
|
||
*/
|
||
static void test_sim_3node_election_one_leader(void)
|
||
{
|
||
raft_sim_cluster_t c;
|
||
memset(&c, 0, sizeof(c));
|
||
|
||
int rc = raft_sim_init(&c, 3, 2000);
|
||
TEST_ASSERT_EQUAL_INT(0, rc);
|
||
|
||
/* Only node 0 starts an election (highest priority) */
|
||
raft_start_election(&c.nodes[0].state);
|
||
|
||
/* 2 RPCs buffered (to nodes 1 and 2) */
|
||
TEST_ASSERT_EQUAL_INT(2, c.pending_count);
|
||
|
||
/* Deliver: nodes 1 and 2 have not voted yet → both grant node 0 */
|
||
raft_sim_deliver_pending(&c);
|
||
|
||
/* Exactly one leader must exist */
|
||
TEST_ASSERT_EQUAL_INT(1, c.leader_count);
|
||
|
||
/* Node 0 must be the leader */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, c.nodes[0].state.role);
|
||
|
||
/* Nodes 1 and 2 are followers */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, c.nodes[1].state.role);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, c.nodes[2].state.role);
|
||
}
|
||
|
||
/*
|
||
* test_sim_start_all_elections_no_winner (task 4.2)
|
||
*
|
||
* All 3 nodes start elections simultaneously at the same term.
|
||
* Each node votes for itself; all peer requests are denied (already voted).
|
||
* No node reaches quorum — leader_count remains 0.
|
||
*
|
||
* This demonstrates that simultaneous same-term elections produce no winner
|
||
* and require a timeout + retry cycle to resolve.
|
||
*/
|
||
static void test_sim_start_all_elections_no_winner(void)
|
||
{
|
||
raft_sim_cluster_t c;
|
||
memset(&c, 0, sizeof(c));
|
||
|
||
int rc = raft_sim_init(&c, 3, 2000);
|
||
TEST_ASSERT_EQUAL_INT(0, rc);
|
||
|
||
/* All nodes start elections at term 1 — each votes for itself */
|
||
raft_sim_start_all_elections(&c);
|
||
|
||
/* 6 RPCs buffered: each of 3 nodes sends to 2 peers */
|
||
TEST_ASSERT_EQUAL_INT(6, c.pending_count);
|
||
|
||
/* Deliver: every node has voted_for=self, so all peer requests are denied */
|
||
raft_sim_deliver_pending(&c);
|
||
|
||
/* No leader — all denied each other */
|
||
TEST_ASSERT_EQUAL_INT(0, c.leader_count);
|
||
|
||
/* All nodes have stepped back to FOLLOWER after all-replied-no-quorum */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, c.nodes[0].state.role);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, c.nodes[1].state.role);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, c.nodes[2].state.role);
|
||
}
|
||
|
||
/*
|
||
* test_sim_partition_no_quorum (task 4.2)
|
||
*
|
||
* Node 2 is isolated before it starts an election.
|
||
* Its vote-request RPCs are dropped during delivery (partition flag set).
|
||
* Node 2 receives no grants and remains CANDIDATE; leader_count stays 0.
|
||
*
|
||
* Steps:
|
||
* 1. raft_sim_init(c, 3, 2000)
|
||
* 2. raft_sim_partition(c, 2, 1) — isolate node 2
|
||
* 3. raft_start_election(&c->nodes[2]) — node 2 starts election
|
||
* 4. raft_sim_deliver_pending(c) — RPCs to/from node 2 are dropped
|
||
* 5. Assert node 2 is still CANDIDATE (no quorum reached)
|
||
* 6. Assert c->leader_count == 0
|
||
*/
|
||
static void test_sim_partition_no_quorum(void)
|
||
{
|
||
raft_sim_cluster_t c;
|
||
memset(&c, 0, sizeof(c));
|
||
|
||
int rc = raft_sim_init(&c, 3, 2000);
|
||
TEST_ASSERT_EQUAL_INT(0, rc);
|
||
|
||
/* Isolate node 2 */
|
||
raft_sim_partition(&c, 2, 1);
|
||
TEST_ASSERT_EQUAL_INT(1, c.nodes[2].partition);
|
||
|
||
/* Node 2 starts an election — becomes CANDIDATE and buffers RPCs */
|
||
raft_start_election(&c.nodes[2].state);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, c.nodes[2].state.role);
|
||
|
||
/* Deliver: node 2 is partitioned → all its RPCs are dropped */
|
||
raft_sim_deliver_pending(&c);
|
||
|
||
/* Node 2 never received any grants — still CANDIDATE */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, c.nodes[2].state.role);
|
||
|
||
/* No leader elected */
|
||
TEST_ASSERT_EQUAL_INT(0, c.leader_count);
|
||
}
|
||
|
||
/*
|
||
* test_sim_fire_timeout_steps_down (task 4.2)
|
||
*
|
||
* Node 0 starts an election (becomes CANDIDATE).
|
||
* raft_sim_fire_timeout fires the election timeout for node 0.
|
||
* Node 0 must step down to FOLLOWER.
|
||
*/
|
||
static void test_sim_fire_timeout_steps_down(void)
|
||
{
|
||
raft_sim_cluster_t c;
|
||
memset(&c, 0, sizeof(c));
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, raft_sim_init(&c, 3, 2000));
|
||
|
||
/* Start election — node 0 becomes CANDIDATE */
|
||
raft_start_election(&c.nodes[0].state);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, c.nodes[0].state.role);
|
||
|
||
/* Fire timeout — no quorum was reached */
|
||
raft_sim_fire_timeout(&c, 0);
|
||
|
||
/* Node 0 must step down */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, c.nodes[0].state.role);
|
||
}
|
||
|
||
/* ---------- Group A: Basic Election Correctness (task 5.1) ---------- */
|
||
|
||
/*
|
||
* test_proto_A1_single_node_self_elects
|
||
*
|
||
* 1-node cluster: raft_start_election returns RAFT_ELECTED_IMMEDIATELY.
|
||
* role==LEADER, leader_count==1, no on_send_vote_request calls (no pending RPCs).
|
||
* on_become_leader fired once.
|
||
*/
|
||
static void test_proto_A1_single_node_self_elects(void)
|
||
{
|
||
raft_sim_cluster_t c;
|
||
memset(&c, 0, sizeof(c));
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, raft_sim_init(&c, 1, 2000));
|
||
|
||
int rc = raft_start_election(&c.nodes[0].state);
|
||
|
||
/* Single-node shortcircuit */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_ELECTED_IMMEDIATELY, rc);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, c.nodes[0].state.role);
|
||
|
||
/* on_become_leader fired once → leader_count incremented */
|
||
TEST_ASSERT_EQUAL_INT(1, c.leader_count);
|
||
|
||
/* No pending RPCs — no on_send_vote_request calls */
|
||
TEST_ASSERT_EQUAL_INT(0, c.pending_count);
|
||
}
|
||
|
||
/*
|
||
* test_proto_A2_3node_one_leader
|
||
*
|
||
* 3-node cluster: node 0 (highest priority, idx=0) wins the election.
|
||
* After deliver_pending: leader_count==1, node 0 is LEADER, others FOLLOWER.
|
||
*/
|
||
static void test_proto_A2_3node_one_leader(void)
|
||
{
|
||
raft_sim_cluster_t c;
|
||
memset(&c, 0, sizeof(c));
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, raft_sim_init(&c, 3, 2000));
|
||
|
||
/* Only node 0 starts — it will ask nodes 1 and 2 for votes */
|
||
raft_start_election(&c.nodes[0].state);
|
||
raft_sim_deliver_pending(&c);
|
||
|
||
/* Exactly one leader */
|
||
TEST_ASSERT_EQUAL_INT(1, c.leader_count);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, c.nodes[0].state.role);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, c.nodes[1].state.role);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, c.nodes[2].state.role);
|
||
}
|
||
|
||
/*
|
||
* test_proto_A3_late_election_denied
|
||
*
|
||
* Node 0 wins at term=1. Node 1 already voted_for=0 at term=1.
|
||
* Send a vote request from idx=2 to node 1 at term=1 directly.
|
||
* Node 1 must DENY (already voted this term), leader_count stays 1.
|
||
*/
|
||
static void test_proto_A3_late_election_denied(void)
|
||
{
|
||
raft_sim_cluster_t c;
|
||
memset(&c, 0, sizeof(c));
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, raft_sim_init(&c, 3, 2000));
|
||
|
||
/* Node 0 wins at term=1 */
|
||
raft_start_election(&c.nodes[0].state);
|
||
raft_sim_deliver_pending(&c);
|
||
TEST_ASSERT_EQUAL_INT(1, c.leader_count);
|
||
|
||
/* Node 1 granted node 0 at term=1: voted_for=0, voted_for_term=1 */
|
||
TEST_ASSERT_EQUAL_INT(0, c.nodes[1].state.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(1, c.nodes[1].state.voted_for_term);
|
||
|
||
/* Now node 2 tries to request a vote from node 1 at the same term=1 */
|
||
uint64_t reply_term = 0;
|
||
int rc = raft_on_vote_request(&c.nodes[1].state, 2, 1, &reply_term);
|
||
|
||
/* Node 1 must deny — already voted for node 0 this term */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
|
||
/* leader_count still 1 (no new leader elected) */
|
||
TEST_ASSERT_EQUAL_INT(1, c.leader_count);
|
||
}
|
||
|
||
/*
|
||
* test_proto_A4_5node_quorum_3
|
||
*
|
||
* 5-node cluster: node 0 starts the election.
|
||
* Quorum=3 (self + 2 peer grants). After deliver, node 0 is LEADER.
|
||
*/
|
||
static void test_proto_A4_5node_quorum_3(void)
|
||
{
|
||
raft_sim_cluster_t c;
|
||
memset(&c, 0, sizeof(c));
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, raft_sim_init(&c, 5, 2000));
|
||
|
||
raft_start_election(&c.nodes[0].state);
|
||
raft_sim_deliver_pending(&c);
|
||
|
||
TEST_ASSERT_EQUAL_INT(1, c.leader_count);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, c.nodes[0].state.role);
|
||
/* Self vote + 4 peer grants → election_decided=1 after first quorum reached */
|
||
TEST_ASSERT_GREATER_OR_EQUAL(3, c.nodes[0].state.votes_granted);
|
||
}
|
||
|
||
/*
|
||
* test_proto_A5_leader_denies_vote_request
|
||
*
|
||
* Node 0 is LEADER at term=1. Receives a vote request from idx=1 at term=1.
|
||
* The role gate must deny (LEADER, same term → no step-down).
|
||
* Node 0 stays LEADER.
|
||
*/
|
||
static void test_proto_A5_leader_denies_vote_request(void)
|
||
{
|
||
raft_sim_cluster_t c;
|
||
memset(&c, 0, sizeof(c));
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, raft_sim_init(&c, 3, 2000));
|
||
|
||
/* Make node 0 the leader */
|
||
raft_start_election(&c.nodes[0].state);
|
||
raft_sim_deliver_pending(&c);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, c.nodes[0].state.role);
|
||
|
||
uint64_t term_before = c.nodes[0].state.term; /* =1 */
|
||
int lc_before = c.leader_count;
|
||
|
||
/* Send a vote request to the leader at the same term */
|
||
uint64_t reply_term = 0;
|
||
int rc = raft_on_vote_request(&c.nodes[0].state, 1, term_before, &reply_term);
|
||
|
||
/* Must be denied */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
|
||
/* Node 0 remains LEADER */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, c.nodes[0].state.role);
|
||
|
||
/* No new leader elected */
|
||
TEST_ASSERT_EQUAL_INT(lc_before, c.leader_count);
|
||
}
|
||
|
||
/* ---------- Group C: on_vote_eligible policy callback (task 5.2) ---------- */
|
||
|
||
/*
|
||
* test_proto_C1_eligible_denies
|
||
*
|
||
* on_vote_eligible returns 0 → RAFT_DENY, voted_for unchanged (-1),
|
||
* vote_eligible_call_count == 1.
|
||
*/
|
||
static void test_proto_C1_eligible_denies(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
cbs.on_vote_eligible = mock_vote_eligible;
|
||
reset_mock();
|
||
g_mock.vote_eligible_return_value = 0; /* deny */
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.term = 1;
|
||
s.voted_for = -1;
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 1, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.vote_eligible_call_count);
|
||
}
|
||
|
||
/*
|
||
* test_proto_C2_eligible_grants
|
||
*
|
||
* on_vote_eligible returns 1 → RAFT_GRANT, voted_for==1,
|
||
* vote_eligible_call_count == 1.
|
||
*/
|
||
static void test_proto_C2_eligible_grants(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
cbs.on_vote_eligible = mock_vote_eligible;
|
||
reset_mock();
|
||
g_mock.vote_eligible_return_value = 1; /* grant */
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.term = 1;
|
||
s.voted_for = -1;
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 1, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc);
|
||
TEST_ASSERT_EQUAL_INT(1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.vote_eligible_call_count);
|
||
}
|
||
|
||
/*
|
||
* test_proto_C3_eligible_null_grants
|
||
*
|
||
* on_vote_eligible is NULL (default make_mock_cbs) → treated as eligible,
|
||
* grant succeeds (RAFT_GRANT).
|
||
*/
|
||
static void test_proto_C3_eligible_null_grants(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
/* on_vote_eligible left NULL in make_mock_cbs */
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.term = 1;
|
||
s.voted_for = -1;
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 1, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc);
|
||
/* vote_eligible not called (NULL) */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.vote_eligible_call_count);
|
||
}
|
||
|
||
/*
|
||
* test_proto_C4_stale_term_no_eligible_call
|
||
*
|
||
* Node at term=5, receives request at term=3 (stale).
|
||
* The stale-term check must return DENY before the policy gate is reached.
|
||
* vote_eligible_call_count must be 0.
|
||
*/
|
||
static void test_proto_C4_stale_term_no_eligible_call(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
cbs.on_vote_eligible = mock_vote_eligible;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.term = 5;
|
||
s.voted_for = -1;
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 3, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.vote_eligible_call_count);
|
||
}
|
||
|
||
/*
|
||
* test_proto_C5_already_voted_no_eligible_call
|
||
*
|
||
* voted_for=1, voted_for_term=3 at term=3.
|
||
* Receives request from idx=2 at term=3.
|
||
* The dup-vote check must fire before the policy gate.
|
||
* vote_eligible_call_count must be 0.
|
||
*/
|
||
static void test_proto_C5_already_voted_no_eligible_call(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
cbs.on_vote_eligible = mock_vote_eligible;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.term = 3;
|
||
s.voted_for = 1;
|
||
s.voted_for_term = 3;
|
||
|
||
int rc = raft_on_vote_request(&s, 2, 3, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.vote_eligible_call_count);
|
||
}
|
||
|
||
/* ---------- Group H: Persistence and restart (task 5.2) ---------- */
|
||
|
||
/*
|
||
* test_proto_H1_init_with_persisted_state
|
||
*
|
||
* raft_config_t with initial_term=5, initial_voted_for=1.
|
||
* After raft_init: s.term==5, s.voted_for==1, s.role==RAFT_FOLLOWER.
|
||
*/
|
||
static void test_proto_H1_init_with_persisted_state(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
raft_config_t cfg;
|
||
|
||
memset(&s, 0, sizeof(s));
|
||
memset(&cfg, 0, sizeof(cfg));
|
||
cfg.n_peers = 3;
|
||
cfg.self_idx = 0;
|
||
cfg.election_timeout_ms = 1000;
|
||
cfg.initial_term = 5;
|
||
cfg.initial_voted_for = 1;
|
||
cfg.cbs = &cbs;
|
||
|
||
int rc = raft_init(&s, &cfg);
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(1, s.voted_for);
|
||
/* The restored vote belongs to the restored term — without this, the
|
||
* duplicate-vote check cannot match after restart (see H6). */
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.voted_for_term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
}
|
||
|
||
/*
|
||
* test_proto_H2_init_first_boot
|
||
*
|
||
* initial_term=0, initial_voted_for=-1 (first boot).
|
||
* After raft_init: s.term==0, s.voted_for==-1, s.role==RAFT_FOLLOWER.
|
||
*/
|
||
static void test_proto_H2_init_first_boot(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
raft_config_t cfg;
|
||
|
||
memset(&s, 0, sizeof(s));
|
||
memset(&cfg, 0, sizeof(cfg));
|
||
cfg.n_peers = 3;
|
||
cfg.self_idx = 0;
|
||
cfg.election_timeout_ms = 1000;
|
||
cfg.initial_term = 0;
|
||
cfg.initial_voted_for = -1;
|
||
cfg.cbs = &cbs;
|
||
|
||
int rc = raft_init(&s, &cfg);
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(0, s.term);
|
||
TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
}
|
||
|
||
/*
|
||
* test_proto_H6_restored_vote_blocks_second_vote
|
||
*
|
||
* Election Safety across restart: a node that voted for candidate 1 in
|
||
* term 5, then restarted (raft_init with initial_term=5, initial_voted_for=1),
|
||
* must DENY a vote request from a DIFFERENT candidate (idx=2) in the same
|
||
* term 5. Without restoring voted_for_term alongside voted_for, the
|
||
* duplicate-vote check cannot match the restored term and the node would
|
||
* grant a second vote in term 5 → two leaders in one term.
|
||
*/
|
||
static void test_proto_H6_restored_vote_blocks_second_vote(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
reset_mock();
|
||
|
||
raft_config_t cfg;
|
||
memset(&s, 0, sizeof(s));
|
||
memset(&cfg, 0, sizeof(cfg));
|
||
cfg.n_peers = 3;
|
||
cfg.self_idx = 0;
|
||
cfg.election_timeout_ms = 1000;
|
||
cfg.initial_term = 5;
|
||
cfg.initial_voted_for = 1; /* persisted vote for candidate 1, term 5 */
|
||
cfg.cbs = &cbs;
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, raft_init(&s, &cfg));
|
||
|
||
/* Different candidate (idx=2) requests a vote in the SAME term 5 */
|
||
int rc = raft_on_vote_request(&s, 2, 5, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(5, reply_term);
|
||
|
||
/* The restored vote must be untouched */
|
||
TEST_ASSERT_EQUAL_INT(1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.voted_for_term);
|
||
|
||
/* Same candidate (idx=1) retransmitting must still be re-granted */
|
||
rc = raft_on_vote_request(&s, 1, 5, &reply_term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc);
|
||
}
|
||
|
||
/*
|
||
* test_proto_H3_persist_before_vote_recorded
|
||
*
|
||
* Verify that on_persist fires BEFORE voted_for is written to raft_state_t.
|
||
* A custom persist callback captures s->voted_for at call time; it must
|
||
* still be -1 (unset) when persist is invoked, and set to the candidate
|
||
* after raft_on_vote_request returns RAFT_GRANT.
|
||
*/
|
||
static raft_state_t *h3_state_ptr = NULL;
|
||
static int h3_voted_for_snapshot = 999; /* sentinel; updated by h3_persist */
|
||
|
||
static int h3_persist(void *ctx, uint64_t term, int voted_for)
|
||
{
|
||
(void)ctx; (void)term; (void)voted_for;
|
||
/* Capture voted_for from the live state object at persist call time */
|
||
if (h3_state_ptr)
|
||
h3_voted_for_snapshot = h3_state_ptr->voted_for;
|
||
g_mock.persist_count++;
|
||
return 0;
|
||
}
|
||
|
||
static void test_proto_H3_persist_before_vote_recorded(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
reset_mock();
|
||
h3_state_ptr = &s;
|
||
h3_voted_for_snapshot = 999; /* reset sentinel */
|
||
cbs.on_persist = h3_persist;
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.term = 1;
|
||
s.voted_for = -1;
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 1, &reply_term);
|
||
|
||
/* Must grant */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc);
|
||
|
||
/* on_persist must have fired once */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.persist_count);
|
||
|
||
/* At persist call time, voted_for must still have been -1 (not yet written) */
|
||
TEST_ASSERT_EQUAL_INT(-1, h3_voted_for_snapshot);
|
||
|
||
/* After the call returns, voted_for must be set to from_idx=1 */
|
||
TEST_ASSERT_EQUAL_INT(1, s.voted_for);
|
||
|
||
h3_state_ptr = NULL;
|
||
}
|
||
|
||
/*
|
||
* test_proto_H4_persist_fail_denies
|
||
*
|
||
* g_mock.persist_return_value = -1.
|
||
* raft_on_vote_request must return RAFT_DENY and leave voted_for==-1.
|
||
*/
|
||
static void test_proto_H4_persist_fail_denies(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
reset_mock();
|
||
g_mock.persist_return_value = -1;
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.term = 1;
|
||
s.voted_for = -1;
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 1, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
|
||
}
|
||
|
||
/*
|
||
* test_proto_H5_start_election_self_vote_persisted
|
||
*
|
||
* raft_start_election(s) for a 3-node cluster.
|
||
* on_persist must fire with (new_term=1, self_idx=0).
|
||
* g_mock.last_persist_voted_for == s.self_idx (0).
|
||
* g_mock.last_persist_term == 1.
|
||
*/
|
||
static void test_proto_H5_start_election_self_vote_persisted(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
|
||
int rc = raft_start_election(&s);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, rc);
|
||
|
||
/* on_persist fired with (term=1, self_idx=0) for the self-vote */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.persist_count);
|
||
TEST_ASSERT_EQUAL_UINT64(1, g_mock.last_persist_term);
|
||
TEST_ASSERT_EQUAL_INT(s.self_idx, g_mock.last_persist_voted_for);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.last_persist_voted_for);
|
||
}
|
||
|
||
/*
|
||
* test_proto_Hnull_required_callback_einval
|
||
*
|
||
* raft_init with NULL on_become_follower → returns -EINVAL.
|
||
* State remains untouched (canary check).
|
||
*/
|
||
static void test_proto_Hnull_required_callback_einval(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
raft_config_t cfg;
|
||
|
||
memset(&s, 0xAB, sizeof(s));
|
||
|
||
cbs.on_become_follower = NULL; /* knock out a required callback */
|
||
|
||
memset(&cfg, 0, sizeof(cfg));
|
||
cfg.n_peers = 3;
|
||
cfg.self_idx = 0;
|
||
cfg.cbs = &cbs;
|
||
|
||
int rc = raft_init(&s, &cfg);
|
||
|
||
TEST_ASSERT_EQUAL_INT(-EINVAL, rc);
|
||
|
||
/* s must be completely unchanged (canary check) */
|
||
{
|
||
unsigned char buf[sizeof(s)];
|
||
memset(buf, 0xAB, sizeof(buf));
|
||
TEST_ASSERT_EQUAL_MEMORY(buf, &s, sizeof(s));
|
||
}
|
||
}
|
||
|
||
/* ---------- Group B: voted_for Invariant (task 5.1) ---------- */
|
||
|
||
/*
|
||
* test_proto_B1_one_vote_per_term
|
||
*
|
||
* Node 2 receives two RPCs in the same term — one from node 0, one from node 1.
|
||
* Both RPCs are buffered (nodes 0 and 1 both start elections simultaneously).
|
||
* After delivery node 2 grants only the first requester; the second is denied.
|
||
* voted_for is set to exactly one candidate.
|
||
*/
|
||
static void test_proto_B1_one_vote_per_term(void)
|
||
{
|
||
raft_sim_cluster_t c;
|
||
memset(&c, 0, sizeof(c));
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, raft_sim_init(&c, 3, 2000));
|
||
|
||
/* Both node 0 and node 1 start elections — they each send to all peers */
|
||
raft_start_election(&c.nodes[0].state);
|
||
raft_start_election(&c.nodes[1].state);
|
||
|
||
/* 4 RPCs buffered: node0→1, node0→2, node1→0, node1→2 */
|
||
TEST_ASSERT_EQUAL_INT(4, c.pending_count);
|
||
|
||
/* Deliver all */
|
||
raft_sim_deliver_pending(&c);
|
||
|
||
/* Node 2 must have voted for exactly one candidate */
|
||
TEST_ASSERT_NOT_EQUAL(-1, c.nodes[2].state.voted_for);
|
||
|
||
/* voted_for must be 0 or 1 (one of the two candidates that requested) */
|
||
int vf = c.nodes[2].state.voted_for;
|
||
TEST_ASSERT_TRUE(vf == 0 || vf == 1);
|
||
}
|
||
|
||
/*
|
||
* test_proto_B2_higher_term_updates_state
|
||
*
|
||
* Single-node at term=2, role=FOLLOWER, voted_for=1 (old vote).
|
||
* Receives vote request at term=5 (higher).
|
||
* Expected: node.term==5, voted_for updated (grant because on_vote_eligible is NULL).
|
||
*/
|
||
static void test_proto_B2_higher_term_updates_state(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 1, 2));
|
||
|
||
/* Simulate old vote from a previous term */
|
||
s.voted_for = 1; /* node voted for itself in an earlier election */
|
||
s.voted_for_term = 1; /* that vote was in term 1 */
|
||
|
||
int rc = raft_on_vote_request(&s, 0, 5, &reply_term);
|
||
|
||
/* Term must be upgraded to 5 */
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
|
||
/* After term upgrade, voted_for is cleared to -1 and then re-evaluated.
|
||
* With on_vote_eligible=NULL and persist succeeding, must grant. */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(5, reply_term);
|
||
|
||
/* voted_for must now be set to from_idx=0 */
|
||
TEST_ASSERT_EQUAL_INT(0, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.voted_for_term);
|
||
}
|
||
|
||
/*
|
||
* test_proto_B3_stale_term_denied
|
||
*
|
||
* Node at term=5. Receives request at term=3 (stale).
|
||
* Must return RAFT_DENY, reply_term==5, node.term==5 (unchanged).
|
||
*/
|
||
static void test_proto_B3_stale_term_denied(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
|
||
int rc = raft_on_vote_request(&s, 0, 3, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(5, reply_term);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term); /* term unchanged */
|
||
|
||
/* on_persist must NOT fire */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
}
|
||
|
||
/*
|
||
* test_proto_B4_different_candidate_denied
|
||
*
|
||
* voted_for=1, voted_for_term=3 at term=3.
|
||
* Receives request from idx=2 at term=3.
|
||
* Must DENY — already voted for 1 this term.
|
||
*/
|
||
static void test_proto_B4_different_candidate_denied(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 3));
|
||
s.voted_for = 1;
|
||
s.voted_for_term = 3;
|
||
|
||
int rc = raft_on_vote_request(&s, 2, 3, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(3, reply_term);
|
||
|
||
/* voted_for must still be 1 — unchanged */
|
||
TEST_ASSERT_EQUAL_INT(1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(3, s.voted_for_term);
|
||
|
||
/* on_persist must NOT fire */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
}
|
||
|
||
/*
|
||
* test_proto_B5_idempotent_same_candidate
|
||
*
|
||
* voted_for=1, voted_for_term=3 at term=3.
|
||
* Receives request from idx=1 at term=3 again (same candidate, same term).
|
||
* Must GRANT (idempotent re-grant).
|
||
*/
|
||
static void test_proto_B5_idempotent_same_candidate(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 3));
|
||
s.voted_for = 1;
|
||
s.voted_for_term = 3;
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 3, &reply_term);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc);
|
||
TEST_ASSERT_EQUAL_UINT64(3, reply_term);
|
||
|
||
/* voted_for must still be 1 */
|
||
TEST_ASSERT_EQUAL_INT(1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(3, s.voted_for_term);
|
||
|
||
/* on_persist fires once for the re-grant */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.persist_count);
|
||
}
|
||
|
||
/* ---------- Group D: Quorum and Result (task 5.3) ---------- */
|
||
|
||
/*
|
||
* test_proto_D1_quorum_1grant_of_2_needed
|
||
*
|
||
* 3-node cluster, node 0 starts election (votes_granted=1, n_peers=3, quorum=2).
|
||
* Feed 1 grant reply from peer 1: votes_granted becomes 2 == quorum.
|
||
* Expected: RAFT_BECAME_LEADER, role==RAFT_LEADER, election_decided==1,
|
||
* on_become_leader fired exactly once.
|
||
*/
|
||
static void test_proto_D1_quorum_1grant_of_2_needed(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
|
||
/* Start election: votes_granted=1 (self), role=CANDIDATE */
|
||
int start_rc = raft_start_election(&s);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, start_rc);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, s.role);
|
||
TEST_ASSERT_EQUAL_INT(1, s.votes_granted);
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.schedule_timeout_count);
|
||
|
||
/* Feed 1 grant from peer 1: votes_granted=2 == quorum=2 */
|
||
int rc = raft_on_vote_reply(&s, 1, 1, 1);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_BECAME_LEADER, rc);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(1, s.election_decided);
|
||
|
||
/* on_become_leader must have fired exactly once */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.become_leader_count);
|
||
}
|
||
|
||
/*
|
||
* test_proto_D2_both_peers_deny_becomes_follower
|
||
*
|
||
* 3-node cluster, node 0 starts election (votes_granted=1, replies_received=0).
|
||
* Feed 2 deny replies from peers 1 and 2.
|
||
* After second deny: replies_received==2 == n_peers-1=2, votes_granted=1 < quorum=2.
|
||
* Expected: RAFT_BECAME_FOLLOWER, role==RAFT_FOLLOWER, election_decided==1,
|
||
* on_become_follower fired.
|
||
*/
|
||
static void test_proto_D2_both_peers_deny_becomes_follower(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
|
||
/* Start election */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, raft_start_election(&s));
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, s.role);
|
||
TEST_ASSERT_EQUAL_INT(0, s.replies_received);
|
||
|
||
/* First deny from peer 1: replies_received=1, still pending */
|
||
int rc1 = raft_on_vote_reply(&s, 1, 0, 1);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PENDING, rc1);
|
||
TEST_ASSERT_EQUAL_INT(1, s.replies_received);
|
||
TEST_ASSERT_EQUAL_INT(0, s.election_decided);
|
||
|
||
/* Second deny from peer 2: replies_received=2 == n_peers-1=2 → step down */
|
||
int rc2 = raft_on_vote_reply(&s, 2, 0, 1);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_BECAME_FOLLOWER, rc2);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(1, s.election_decided);
|
||
|
||
/* on_become_follower must have fired once */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.become_follower_count);
|
||
}
|
||
|
||
/*
|
||
* test_proto_D3_second_vote_reply_noop
|
||
*
|
||
* 3-node cluster, start election.
|
||
* Feed 1 grant → RAFT_BECAME_LEADER (election_decided=1).
|
||
* Feed a second grant from peer 2 → RAFT_PENDING (noop, election_decided guard).
|
||
* Expected: become_leader_count still 1 (on_become_leader fired exactly once).
|
||
*/
|
||
static void test_proto_D3_second_vote_reply_noop(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
|
||
/* Start election */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, raft_start_election(&s));
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, s.role);
|
||
|
||
/* First grant: wins election */
|
||
int rc1 = raft_on_vote_reply(&s, 1, 1, 1);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_BECAME_LEADER, rc1);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(1, s.election_decided);
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.become_leader_count);
|
||
|
||
/* Second grant from peer 2: election already decided → noop */
|
||
int rc2 = raft_on_vote_reply(&s, 2, 1, 1);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PENDING, rc2);
|
||
|
||
/* on_become_leader must NOT have fired again */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.become_leader_count);
|
||
}
|
||
|
||
/*
|
||
* test_proto_D4_reply_higher_term_steps_down
|
||
*
|
||
* 3-node cluster, start election (term=1).
|
||
* Feed reply with term=3 (granted=0) → higher term → step down.
|
||
* Expected: RAFT_BECAME_FOLLOWER, role==RAFT_FOLLOWER, s.term==3,
|
||
* election_decided==1, on_become_follower fired.
|
||
*/
|
||
static void test_proto_D4_reply_higher_term_steps_down(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
|
||
/* Start election: term becomes 1 */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, raft_start_election(&s));
|
||
TEST_ASSERT_EQUAL_INT(1, (int)s.term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, s.role);
|
||
|
||
/* Reply with higher term=3, not granted */
|
||
int rc = raft_on_vote_reply(&s, 1, 0, 3);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_BECAME_FOLLOWER, rc);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_UINT64(3, s.term);
|
||
TEST_ASSERT_EQUAL_INT(1, s.election_decided);
|
||
|
||
/* on_become_follower must have fired once */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.become_follower_count);
|
||
}
|
||
|
||
/* ---------- Group E: Election Timeout (task 5.3) ---------- */
|
||
|
||
/*
|
||
* test_proto_E1_timeout_before_quorum
|
||
*
|
||
* 3-node cluster, start election (on_schedule_timeout fires → schedule_timeout_count==1).
|
||
* Call raft_on_election_timeout before any replies.
|
||
* Expected: role==RAFT_FOLLOWER, election_decided==1, on_become_follower fired,
|
||
* on_cancel_timeout fired.
|
||
*/
|
||
static void test_proto_E1_timeout_before_quorum(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
|
||
/* Start election: schedule_timeout fires */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, raft_start_election(&s));
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, s.role);
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.schedule_timeout_count);
|
||
|
||
/* Fire timeout before any replies */
|
||
raft_on_election_timeout(&s);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(1, s.election_decided);
|
||
|
||
/* on_become_follower must have fired */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.become_follower_count);
|
||
|
||
/* on_cancel_timeout must have fired */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.cancel_timeout_count);
|
||
}
|
||
|
||
/*
|
||
* test_proto_E2_timeout_after_quorum_noop
|
||
*
|
||
* 3-node cluster, start election, feed 1 grant → RAFT_BECAME_LEADER.
|
||
* Call raft_on_election_timeout.
|
||
* Expected: role still RAFT_LEADER (already decided, timeout is noop),
|
||
* on_cancel_timeout fired (stale timer cleanup),
|
||
* on_become_follower NOT additionally fired.
|
||
*/
|
||
static void test_proto_E2_timeout_after_quorum_noop(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
|
||
/* Start election */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, raft_start_election(&s));
|
||
|
||
/* Feed 1 grant → LEADER */
|
||
int rc = raft_on_vote_reply(&s, 1, 1, 1);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_BECAME_LEADER, rc);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(1, s.election_decided);
|
||
|
||
/* Snapshot counters before stale timeout delivery */
|
||
int follower_before = g_mock.become_follower_count;
|
||
int cancel_before = g_mock.cancel_timeout_count;
|
||
|
||
/* Fire timeout: already decided → fires on_cancel_timeout, no other effects (Req 6.3) */
|
||
raft_on_election_timeout(&s);
|
||
|
||
/* Role must still be LEADER */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, s.role);
|
||
|
||
/* on_cancel_timeout fires exactly once for the stale delivery (Req 6.3) */
|
||
TEST_ASSERT_EQUAL_INT(cancel_before + 1, g_mock.cancel_timeout_count);
|
||
|
||
/* on_become_follower must NOT have fired additionally */
|
||
TEST_ASSERT_EQUAL_INT(follower_before, g_mock.become_follower_count);
|
||
}
|
||
|
||
/*
|
||
* test_proto_E3_new_election_after_timeout
|
||
*
|
||
* 3-node cluster, start election (term=1).
|
||
* Timeout fires → becomes FOLLOWER (election_decided=1).
|
||
* Start new election: raft_start_election again.
|
||
* Expected: term==2 (incremented), on_schedule_timeout fired again
|
||
* (schedule_timeout_count==2 total).
|
||
*/
|
||
static void test_proto_E3_new_election_after_timeout(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
|
||
/* First election: term=1 */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, raft_start_election(&s));
|
||
TEST_ASSERT_EQUAL_UINT64(1, s.term);
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.schedule_timeout_count);
|
||
|
||
/* Timeout: step down to FOLLOWER */
|
||
raft_on_election_timeout(&s);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(1, s.election_decided);
|
||
|
||
/* Start new election: election_decided=1 means old state decided — need to
|
||
* reset election state so raft_start_election allows another attempt.
|
||
* Per spec: a new election restarts the state machine; reset election_decided. */
|
||
s.election_decided = 0;
|
||
s.role = RAFT_FOLLOWER;
|
||
|
||
int rc2 = raft_start_election(&s);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, rc2);
|
||
|
||
/* Term must have incremented to 2 */
|
||
TEST_ASSERT_EQUAL_UINT64(2, s.term);
|
||
|
||
/* on_schedule_timeout must have fired again (total 2) */
|
||
TEST_ASSERT_EQUAL_INT(2, g_mock.schedule_timeout_count);
|
||
}
|
||
|
||
/* ---------- Group F: RDHUP Failover (task 5.4) ---------- */
|
||
|
||
/*
|
||
* test_proto_F1_leader_lost_priority_delay
|
||
*
|
||
* Verify that on_start_election_after_delay fires with delay = my_priority * election_timeout_ms.
|
||
* Node 1 (priority=1, timeout=1000) → delay=1000ms.
|
||
* Node 2 (priority=2, timeout=1000) → delay=2000ms.
|
||
*/
|
||
static void test_proto_F1_leader_lost_priority_delay(void)
|
||
{
|
||
/* --- Node 1: priority=1, election_timeout_ms=1000 → expected delay=1000 --- */
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
raft_config_t cfg;
|
||
|
||
reset_mock();
|
||
memset(&cfg, 0, sizeof(cfg));
|
||
cfg.n_peers = 3;
|
||
cfg.self_idx = 1;
|
||
cfg.my_priority = 1;
|
||
cfg.election_timeout_ms = 1000;
|
||
cfg.initial_voted_for = -1;
|
||
cfg.cbs = &cbs;
|
||
TEST_ASSERT_EQUAL_INT(0, raft_init(&s, &cfg));
|
||
|
||
raft_on_leader_lost(&s);
|
||
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.start_election_after_delay_count);
|
||
TEST_ASSERT_EQUAL_UINT32(1000, g_mock.last_start_election_delay);
|
||
}
|
||
|
||
/* --- Node 2: priority=2, election_timeout_ms=1000 → expected delay=2000 --- */
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
raft_config_t cfg;
|
||
|
||
reset_mock();
|
||
memset(&cfg, 0, sizeof(cfg));
|
||
cfg.n_peers = 3;
|
||
cfg.self_idx = 2;
|
||
cfg.my_priority = 2;
|
||
cfg.election_timeout_ms = 1000;
|
||
cfg.initial_voted_for = -1;
|
||
cfg.cbs = &cbs;
|
||
TEST_ASSERT_EQUAL_INT(0, raft_init(&s, &cfg));
|
||
|
||
raft_on_leader_lost(&s);
|
||
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.start_election_after_delay_count);
|
||
TEST_ASSERT_EQUAL_UINT32(2000, g_mock.last_start_election_delay);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* test_proto_F2_voted_during_delay_skip
|
||
*
|
||
* Node calls raft_on_leader_lost (voted_for=-1).
|
||
* During the jitter delay, a vote request arrives from node 0 at term=1.
|
||
* Node grants the vote (voted_for=0).
|
||
* Then raft_check_and_start_election is called.
|
||
* Since voted_for==0 != self_idx==1, must return RAFT_SKIP_ELECTION.
|
||
*/
|
||
static void test_proto_F2_voted_during_delay_skip(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
raft_config_t cfg;
|
||
uint64_t reply_term = 0;
|
||
|
||
reset_mock();
|
||
memset(&cfg, 0, sizeof(cfg));
|
||
cfg.n_peers = 3;
|
||
cfg.self_idx = 1;
|
||
cfg.my_priority = 1;
|
||
cfg.election_timeout_ms = 1000;
|
||
cfg.initial_voted_for = -1;
|
||
cfg.cbs = &cbs;
|
||
TEST_ASSERT_EQUAL_INT(0, raft_init(&s, &cfg));
|
||
|
||
/* Leader lost: clears voted_for to -1, schedules delayed election */
|
||
raft_on_leader_lost(&s);
|
||
TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
|
||
|
||
/* During the delay, a vote request arrives from node 0 at term=1 */
|
||
int rc = raft_on_vote_request(&s, 0, 1, &reply_term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc);
|
||
TEST_ASSERT_EQUAL_INT(0, s.voted_for);
|
||
|
||
/* Timer fires: check-and-start sees voted_for=0 != self_idx=1 → skip */
|
||
int check_rc = raft_check_and_start_election(&s);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_SKIP_ELECTION, check_rc);
|
||
|
||
/* Role must stay FOLLOWER — no election started */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
}
|
||
|
||
/*
|
||
* test_proto_F3_no_vote_during_delay_starts_election
|
||
*
|
||
* Node 0 (priority=0, self_idx=0) calls raft_on_leader_lost.
|
||
* No vote arrives during the delay (voted_for stays -1).
|
||
* raft_check_and_start_election must return RAFT_ELECTION_STARTED and role==CANDIDATE.
|
||
*/
|
||
static void test_proto_F3_no_vote_during_delay_starts_election(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
raft_config_t cfg;
|
||
|
||
reset_mock();
|
||
memset(&cfg, 0, sizeof(cfg));
|
||
cfg.n_peers = 3;
|
||
cfg.self_idx = 0;
|
||
cfg.my_priority = 0;
|
||
cfg.election_timeout_ms = 1000;
|
||
cfg.initial_voted_for = -1;
|
||
cfg.cbs = &cbs;
|
||
TEST_ASSERT_EQUAL_INT(0, raft_init(&s, &cfg));
|
||
|
||
/* Leader lost: voted_for cleared to -1 */
|
||
raft_on_leader_lost(&s);
|
||
TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
|
||
|
||
/* No vote arrived during the delay */
|
||
int rc = raft_check_and_start_election(&s);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_ELECTION_STARTED, rc);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, s.role);
|
||
}
|
||
|
||
/*
|
||
* test_proto_F4_simultaneous_rdhup_one_leader
|
||
*
|
||
* Nodes 1 and 2 both receive RDHUP (leader/node 0 lost).
|
||
* Both call raft_on_leader_lost → voted_for=-1 for both.
|
||
* Node 1 (lower idx, lower priority) calls check_and_start first → ELECTION_STARTED.
|
||
* Node 1 sends vote requests; deliver them to node 2.
|
||
* Node 2 grants node 1 (voted_for=1).
|
||
* Node 2 then calls check_and_start → RAFT_SKIP_ELECTION (voted_for=1 != self_idx=2).
|
||
* Result: leader_count==1.
|
||
*/
|
||
static void test_proto_F4_simultaneous_rdhup_one_leader(void)
|
||
{
|
||
raft_sim_cluster_t c;
|
||
memset(&c, 0, sizeof(c));
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, raft_sim_init(&c, 3, 2000));
|
||
|
||
/* Simulate: node 0 was the leader, now lost. Nodes 1 and 2 see RDHUP. */
|
||
raft_on_leader_lost(&c.nodes[1].state);
|
||
raft_on_leader_lost(&c.nodes[2].state);
|
||
|
||
/* Both have voted_for=-1 now */
|
||
TEST_ASSERT_EQUAL_INT(-1, c.nodes[1].state.voted_for);
|
||
TEST_ASSERT_EQUAL_INT(-1, c.nodes[2].state.voted_for);
|
||
|
||
/* Node 1 fires its delayed timer first (lower priority = smaller delay) */
|
||
int rc1 = raft_check_and_start_election(&c.nodes[1].state);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_ELECTION_STARTED, rc1);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, c.nodes[1].state.role);
|
||
|
||
/* Deliver node 1's vote requests to the cluster (node 2 gets one, node 0 is gone) */
|
||
/* Only deliver the RPC intended for node 2; skip node 0 (it's gone/isolated) */
|
||
raft_sim_partition(&c, 0, 1); /* node 0 is isolated (lost leader) */
|
||
raft_sim_deliver_pending(&c);
|
||
|
||
/* Node 2 received node 1's vote request and granted it */
|
||
TEST_ASSERT_EQUAL_INT(1, c.nodes[2].state.voted_for);
|
||
|
||
/* Node 2's timer fires: check_and_start sees voted_for=1 != self_idx=2 → skip */
|
||
int rc2 = raft_check_and_start_election(&c.nodes[2].state);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_SKIP_ELECTION, rc2);
|
||
|
||
/* Exactly one leader (node 1) elected */
|
||
TEST_ASSERT_EQUAL_INT(1, c.leader_count);
|
||
}
|
||
|
||
/* ---------- Group G: Split-Brain Prevention (task 5.4) ---------- */
|
||
|
||
/*
|
||
* test_proto_G1_no_split_brain_100_rounds
|
||
*
|
||
* Run 100 independent election rounds on a fresh 3-node cluster each time.
|
||
* Node 0 always starts first. After delivering pending RPCs, leader_count must
|
||
* equal exactly 1 (no split brain, no starvation).
|
||
*/
|
||
static void test_proto_G1_no_split_brain_100_rounds(void)
|
||
{
|
||
int total_leaders = 0;
|
||
|
||
for (int round = 0; round < 100; round++) {
|
||
raft_sim_cluster_t c;
|
||
memset(&c, 0, sizeof(c));
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, raft_sim_init(&c, 3, 2000));
|
||
|
||
/* Node 0 always starts first (highest priority, idx=0) */
|
||
raft_start_election(&c.nodes[0].state);
|
||
raft_sim_deliver_pending(&c);
|
||
|
||
/* Each round must produce exactly one leader — no split brain */
|
||
TEST_ASSERT_EQUAL_INT(1, c.leader_count);
|
||
total_leaders += c.leader_count;
|
||
}
|
||
|
||
/* Across 100 rounds, exactly 100 leaders must have been elected */
|
||
TEST_ASSERT_EQUAL_INT(100, total_leaders);
|
||
}
|
||
|
||
/*
|
||
* test_proto_G2_partition_minority_no_quorum
|
||
*
|
||
* 3-node cluster. Node 2 is isolated (partition of 1).
|
||
* Nodes 0+1 form the majority partition (size=2 = quorum).
|
||
* Node 0 starts election in the majority partition → wins (leader_count=1).
|
||
* Node 2 tries to start election in isolation → RPCs dropped → cannot win.
|
||
* leader_count remains 1.
|
||
*/
|
||
static void test_proto_G2_partition_minority_no_quorum(void)
|
||
{
|
||
raft_sim_cluster_t c;
|
||
memset(&c, 0, sizeof(c));
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, raft_sim_init(&c, 3, 2000));
|
||
|
||
/* Isolate node 2 (minority partition of 1) */
|
||
raft_sim_partition(&c, 2, 1);
|
||
|
||
/* Node 0 starts election in the majority partition {0, 1} */
|
||
raft_start_election(&c.nodes[0].state);
|
||
raft_sim_deliver_pending(&c);
|
||
|
||
/* Nodes 0+1 have quorum=2; node 0 must be LEADER */
|
||
TEST_ASSERT_EQUAL_INT(1, c.leader_count);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, c.nodes[0].state.role);
|
||
|
||
/* Node 2 attempts to start an election in isolation */
|
||
raft_start_election(&c.nodes[2].state);
|
||
raft_sim_deliver_pending(&c); /* RPCs to/from node 2 are dropped */
|
||
|
||
/* Node 2 cannot win — still CANDIDATE (no grants received) */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, c.nodes[2].state.role);
|
||
|
||
/* leader_count still 1 — no split brain */
|
||
TEST_ASSERT_EQUAL_INT(1, c.leader_count);
|
||
}
|
||
|
||
#endif /* XCE_TESTING */
|
||
|
||
/* ---------- raft_on_pre_vote_request tests (task 2.1) ---------- */
|
||
|
||
/*
|
||
* raft_on_pre_vote_request is the voter-side PreVote decision. It mirrors
|
||
* raft_on_vote_request's Step 1 (stale-term deny) and Step 5 (on_vote_eligible
|
||
* gate) but strips ALL persistent mutation: it must never touch term,
|
||
* voted_for, voted_for_term, role, and must never call on_persist. Freshness is
|
||
* applied by the dispatcher BEFORE this call (same contract as the real vote).
|
||
*/
|
||
|
||
/*
|
||
* test_pre_vote_req_grant_higher_term_eligible
|
||
*
|
||
* Node at term=5 (FOLLOWER, no vote), receives PreVote for cand_term=6 with the
|
||
* eligibility callback granting (return 1). Expected: grant (1), and term /
|
||
* voted_for / voted_for_term / role all unchanged, on_persist NOT called.
|
||
*/
|
||
static void test_pre_vote_req_grant_higher_term_eligible(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
cbs.on_vote_eligible = mock_vote_eligible;
|
||
reset_mock();
|
||
g_mock.vote_eligible_return_value = 1; /* eligibility grants */
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
|
||
int rc = raft_on_pre_vote_request(&s, 1, 6);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc);
|
||
|
||
/* PURITY: nothing persistent may change on a granted PreVote */
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(0, s.voted_for_term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
|
||
/* eligibility gate was consulted */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.vote_eligible_call_count);
|
||
}
|
||
|
||
/*
|
||
* test_pre_vote_req_grant_equal_term_eligible
|
||
*
|
||
* Equal-term candidate (cand_term == s->term) must NOT be denied by the
|
||
* stale-term gate (deny is only for cand_term < term), and is granted when
|
||
* eligibility allows. Purity invariant still holds.
|
||
*/
|
||
static void test_pre_vote_req_grant_equal_term_eligible(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
cbs.on_vote_eligible = mock_vote_eligible;
|
||
reset_mock();
|
||
g_mock.vote_eligible_return_value = 1;
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
|
||
int rc = raft_on_pre_vote_request(&s, 1, 5); /* equal term */
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc);
|
||
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(0, s.voted_for_term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
}
|
||
|
||
/*
|
||
* test_pre_vote_req_deny_stale_term
|
||
*
|
||
* Node at term=5, receives PreVote for cand_term=4 (< term). Expected: deny (0)
|
||
* WITHOUT consulting on_vote_eligible, no term-adoption, no persist.
|
||
*/
|
||
static void test_pre_vote_req_deny_stale_term(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
cbs.on_vote_eligible = mock_vote_eligible;
|
||
reset_mock();
|
||
g_mock.vote_eligible_return_value = 1; /* would grant if consulted */
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
|
||
int rc = raft_on_pre_vote_request(&s, 1, 4); /* stale */
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
|
||
/* Stale-term denial short-circuits BEFORE the eligibility gate. */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.vote_eligible_call_count);
|
||
|
||
/* PURITY: term must NOT be adopted, no persist. */
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(0, s.voted_for_term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
}
|
||
|
||
/*
|
||
* test_pre_vote_req_deny_eligibility_rejects
|
||
*
|
||
* Fresh, higher-term candidate but the eligibility callback rejects (returns 0)
|
||
* — e.g. primary-deny / fresh-heartbeat stickiness / catch-up. Expected: deny,
|
||
* with the eligibility gate consulted, and the purity invariant preserved.
|
||
*/
|
||
static void test_pre_vote_req_deny_eligibility_rejects(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
cbs.on_vote_eligible = mock_vote_eligible;
|
||
reset_mock();
|
||
g_mock.vote_eligible_return_value = 0; /* eligibility denies */
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
|
||
int rc = raft_on_pre_vote_request(&s, 1, 6);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_DENY, rc);
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.vote_eligible_call_count);
|
||
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(0, s.voted_for_term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
}
|
||
|
||
/*
|
||
* test_pre_vote_req_null_eligible_grants
|
||
*
|
||
* When on_vote_eligible is NULL, a fresh higher-or-equal-term candidate is
|
||
* granted (all Raft-eligible candidates granted), with no mutation/persist.
|
||
*/
|
||
static void test_pre_vote_req_null_eligible_grants(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
/* on_vote_eligible deliberately left NULL */
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
|
||
int rc = raft_on_pre_vote_request(&s, 1, 6);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc);
|
||
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(-1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(0, s.voted_for_term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
}
|
||
|
||
/*
|
||
* test_pre_vote_req_grant_preserves_existing_vote (Req 2.4)
|
||
*
|
||
* A node that has already voted for someone in the current term may still GRANT
|
||
* a PreVote (PreVote does not consume / change the recorded vote). Confirms the
|
||
* existing voted_for / voted_for_term are untouched by a granted PreVote.
|
||
*/
|
||
static void test_pre_vote_req_grant_preserves_existing_vote(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
cbs.on_vote_eligible = mock_vote_eligible;
|
||
reset_mock();
|
||
g_mock.vote_eligible_return_value = 1;
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
/* Node already cast its real vote for peer 1 in term 5. */
|
||
s.voted_for = 1;
|
||
s.voted_for_term = 5;
|
||
|
||
/* A different candidate (peer 2) probes a PreVote for term 6. */
|
||
int rc = raft_on_pre_vote_request(&s, 2, 6);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc);
|
||
|
||
/* The recorded real vote must be untouched (no consume, no overwrite). */
|
||
TEST_ASSERT_EQUAL_INT(1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.voted_for_term);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
}
|
||
|
||
/* ---------- raft_begin_pre_vote tests (task 2.2) ---------- */
|
||
|
||
/*
|
||
* raft_begin_pre_vote is the candidate-side PreVote start. It is the pre-image
|
||
* of raft_start_election: it sends a probe to each peer and tallies a self-grant,
|
||
* but STRIPS the term++/persist/role-change/timeout. Per Req 1.2/1.3/6.2 it must
|
||
* NOT modify s->term, s->voted_for, s->voted_for_term, s->role, and must NOT call
|
||
* on_persist. The prospective term (term+1) is a LOCAL value only.
|
||
*/
|
||
|
||
/*
|
||
* test_begin_pre_vote_uses_prospective_term_not_persisted
|
||
*
|
||
* 3-node FOLLOWER at term=5. raft_begin_pre_vote must send PreVote requests
|
||
* carrying prospective_term = term+1 = 6 to each peer, while s->term itself
|
||
* stays 5 and on_persist never fires.
|
||
*/
|
||
static void test_begin_pre_vote_uses_prospective_term_not_persisted(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
|
||
int rc = raft_begin_pre_vote(&s);
|
||
|
||
/* Round started (multi-node, not single) */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, rc);
|
||
|
||
/* Each peer probe carried prospective term = term+1 = 6 */
|
||
TEST_ASSERT_EQUAL_UINT64(6, g_mock.last_pre_vote_term);
|
||
|
||
/* PURITY: persistent term is unchanged (still 5) and never persisted */
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
}
|
||
|
||
/*
|
||
* test_begin_pre_vote_sends_once_per_non_self_peer
|
||
*
|
||
* 3-node FOLLOWER, self=1. The send-pre-vote callback must fire exactly once
|
||
* for each peer != self (peers 0 and 2), never for self.
|
||
*/
|
||
static void test_begin_pre_vote_sends_once_per_non_self_peer(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 1, 5));
|
||
|
||
int rc = raft_begin_pre_vote(&s);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, rc);
|
||
|
||
/* Exactly n_peers-1 = 2 sends */
|
||
TEST_ASSERT_EQUAL_INT(2, g_mock.send_pre_vote_request_count);
|
||
|
||
/* Self (idx 1) must NOT be probed; peers 0 and 2 must each be probed once. */
|
||
TEST_ASSERT_EQUAL_UINT64(0, g_mock.pre_vote_sent_term[1]); /* self untouched */
|
||
TEST_ASSERT_EQUAL_UINT64(6, g_mock.pre_vote_sent_term[0]);
|
||
TEST_ASSERT_EQUAL_UINT64(6, g_mock.pre_vote_sent_term[2]);
|
||
|
||
/* None of the ordered sent peers is self_idx=1 */
|
||
for (int i = 0; i < g_mock.send_pre_vote_request_count; i++)
|
||
TEST_ASSERT_NOT_EQUAL(1, g_mock.pre_vote_sent_peers[i]);
|
||
}
|
||
|
||
/*
|
||
* test_begin_pre_vote_self_grant_and_in_progress
|
||
*
|
||
* After begin, the PreVote tally must show in_progress=1 and a single self-grant
|
||
* (pre_votes_granted=1). No real election timeout is scheduled here (the
|
||
* controller arms the round timeout separately).
|
||
*/
|
||
static void test_begin_pre_vote_self_grant_and_in_progress(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
|
||
int rc = raft_begin_pre_vote(&s);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, rc);
|
||
|
||
TEST_ASSERT_EQUAL_INT(1, s.pre_vote_in_progress);
|
||
TEST_ASSERT_EQUAL_INT(1, s.pre_votes_granted); /* self-grant only */
|
||
|
||
/* No election-timeout scheduled by begin_pre_vote (controller owns it). */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.schedule_timeout_count);
|
||
}
|
||
|
||
/*
|
||
* test_begin_pre_vote_purity_no_persistent_mutation
|
||
*
|
||
* Byte-for-byte: term, voted_for, voted_for_term, role unchanged; no persist,
|
||
* no role transition to CANDIDATE, no become_leader/become_follower.
|
||
*/
|
||
static void test_begin_pre_vote_purity_no_persistent_mutation(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
/* Node already cast a real vote for peer 2 in term 5 — must survive. */
|
||
s.voted_for = 2;
|
||
s.voted_for_term = 5;
|
||
|
||
int rc = raft_begin_pre_vote(&s);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, rc);
|
||
|
||
/* PURITY: every persistent field untouched */
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(2, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.voted_for_term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role); /* stays FOLLOWER, not CANDIDATE */
|
||
|
||
/* No persistence / no leadership-transition side effects */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_follower_count);
|
||
}
|
||
|
||
/*
|
||
* test_begin_pre_vote_single_node_wins
|
||
*
|
||
* 1-node cluster: no peers, the self-grant is already a majority, so the round
|
||
* is won immediately. Returns RAFT_PRE_VOTE_WON, sends nothing, and still
|
||
* mutates no persistent state.
|
||
*/
|
||
static void test_begin_pre_vote_single_node_wins(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 1, 0, 5));
|
||
|
||
int rc = raft_begin_pre_vote(&s);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_WON, rc);
|
||
|
||
/* No peer probes for a single-node cluster */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.send_pre_vote_request_count);
|
||
|
||
/* Self-grant recorded as a majority */
|
||
TEST_ASSERT_EQUAL_INT(1, s.pre_votes_granted);
|
||
|
||
/* PURITY even on the WON short-circuit */
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
}
|
||
|
||
/*
|
||
* test_begin_pre_vote_null_send_callback_suppressed
|
||
*
|
||
* If on_send_pre_vote_request is NULL, begin must still run (the caller owns
|
||
* transport) without crashing, recording the self-grant, and emitting no sends.
|
||
*/
|
||
static void test_begin_pre_vote_null_send_callback_suppressed(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
cbs.on_send_pre_vote_request = NULL; /* suppressed */
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
|
||
int rc = raft_begin_pre_vote(&s);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, rc);
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.send_pre_vote_request_count);
|
||
TEST_ASSERT_EQUAL_INT(1, s.pre_vote_in_progress);
|
||
TEST_ASSERT_EQUAL_INT(1, s.pre_votes_granted);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
}
|
||
|
||
/* ---------- raft_on_pre_vote_reply tally (task 2.3) ---------- */
|
||
|
||
/*
|
||
* Helper: arm a pre-vote round on an n-node cluster at the given term.
|
||
* Mirrors what raft_begin_pre_vote sets up (self-grant, in-progress), so the
|
||
* tally tests can feed replies without depending on the send transport.
|
||
*/
|
||
static int arm_pre_vote_round(raft_state_t *s, raft_callbacks_t *cbs,
|
||
int n_peers, int self_idx, uint64_t term)
|
||
{
|
||
int rc = init_vote_node(s, cbs, n_peers, self_idx, term);
|
||
if (rc != 0)
|
||
return rc;
|
||
/* Suppress sends; we drive replies directly. */
|
||
raft_begin_pre_vote(s);
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* test_pre_vote_reply_won_at_quorum
|
||
*
|
||
* 3-node cluster (quorum=2), self-grant already counted. One peer grants →
|
||
* the round is WON. Tally lives on the raft state; in-progress is cleared.
|
||
*/
|
||
static void test_pre_vote_reply_won_at_quorum(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, arm_pre_vote_round(&s, &cbs, 3, 0, 5));
|
||
/* begin sent to peers; clear send counter so it does not confuse asserts. */
|
||
|
||
int rc = raft_on_pre_vote_reply(&s, 1, 1 /* granted */);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_WON, rc);
|
||
TEST_ASSERT_EQUAL_INT(2, s.pre_votes_granted); /* self + peer 1 */
|
||
TEST_ASSERT_EQUAL_INT(0, s.pre_vote_in_progress); /* round closed */
|
||
|
||
/* CRITICAL: a win must NEVER fire leadership callbacks. */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_follower_count);
|
||
}
|
||
|
||
/*
|
||
* test_pre_vote_reply_lost_when_all_reply_no_quorum
|
||
*
|
||
* 3-node cluster. Both peers deny. After all non-self peers reply without
|
||
* quorum, the round is LOST.
|
||
*/
|
||
static void test_pre_vote_reply_lost_when_all_reply_no_quorum(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, arm_pre_vote_round(&s, &cbs, 3, 0, 5));
|
||
|
||
int rc1 = raft_on_pre_vote_reply(&s, 1, 0 /* deny */);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_PENDING, rc1); /* one peer still out */
|
||
|
||
int rc2 = raft_on_pre_vote_reply(&s, 2, 0 /* deny */);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_LOST, rc2); /* all replied, no quorum */
|
||
|
||
TEST_ASSERT_EQUAL_INT(1, s.pre_votes_granted); /* self only */
|
||
TEST_ASSERT_EQUAL_INT(0, s.pre_vote_in_progress);
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_follower_count);
|
||
}
|
||
|
||
/*
|
||
* test_pre_vote_reply_pending_when_undecided
|
||
*
|
||
* 3-node cluster. One peer denies, the other has not replied yet → PENDING
|
||
* (quorum still reachable).
|
||
*/
|
||
static void test_pre_vote_reply_pending_when_undecided(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, arm_pre_vote_round(&s, &cbs, 3, 0, 5));
|
||
|
||
int rc = raft_on_pre_vote_reply(&s, 1, 0 /* deny */);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_PENDING, rc);
|
||
TEST_ASSERT_EQUAL_INT(1, s.pre_votes_granted); /* self only */
|
||
TEST_ASSERT_EQUAL_INT(1, s.pre_vote_in_progress); /* still open */
|
||
}
|
||
|
||
/*
|
||
* test_pre_vote_reply_duplicate_ignored
|
||
*
|
||
* A duplicate reply from the same peer must not double-count. A grant from
|
||
* peer 1, then a second grant from peer 1, leaves the tally at 2 (self + one
|
||
* grant). In a 5-node cluster (quorum=3) that keeps the round PENDING.
|
||
*/
|
||
static void test_pre_vote_reply_duplicate_ignored(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, arm_pre_vote_round(&s, &cbs, 5, 0, 5));
|
||
|
||
int rc1 = raft_on_pre_vote_reply(&s, 1, 1 /* grant */);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_PENDING, rc1);
|
||
TEST_ASSERT_EQUAL_INT(2, s.pre_votes_granted); /* self + peer 1 */
|
||
|
||
/* Duplicate grant from peer 1 — must be ignored. */
|
||
int rc2 = raft_on_pre_vote_reply(&s, 1, 1 /* grant again */);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_PENDING, rc2);
|
||
TEST_ASSERT_EQUAL_INT(2, s.pre_votes_granted); /* unchanged: no double-count */
|
||
TEST_ASSERT_EQUAL_INT(1, s.pre_vote_in_progress);
|
||
}
|
||
|
||
/*
|
||
* test_pre_vote_reply_won_purity_state_unchanged
|
||
*
|
||
* On WON: term, voted_for, voted_for_term, role are all unchanged and no
|
||
* persist / leadership callback fires.
|
||
*/
|
||
static void test_pre_vote_reply_won_purity_state_unchanged(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, arm_pre_vote_round(&s, &cbs, 3, 0, 5));
|
||
/* A real vote cast earlier in this term must survive the tally. */
|
||
s.voted_for = 2;
|
||
s.voted_for_term = 5;
|
||
|
||
int rc = raft_on_pre_vote_reply(&s, 1, 1 /* grant */);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_WON, rc);
|
||
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(2, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.voted_for_term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_follower_count);
|
||
}
|
||
|
||
/*
|
||
* test_pre_vote_reply_lost_purity_state_unchanged
|
||
*
|
||
* On LOST: term / voted_for / role unchanged; no leadership callback.
|
||
*/
|
||
static void test_pre_vote_reply_lost_purity_state_unchanged(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, arm_pre_vote_round(&s, &cbs, 3, 0, 7));
|
||
s.voted_for = 1;
|
||
s.voted_for_term = 7;
|
||
|
||
raft_on_pre_vote_reply(&s, 1, 0 /* deny */);
|
||
int rc = raft_on_pre_vote_reply(&s, 2, 0 /* deny */);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_LOST, rc);
|
||
|
||
TEST_ASSERT_EQUAL_UINT64(7, s.term);
|
||
TEST_ASSERT_EQUAL_INT(1, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(7, s.voted_for_term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_follower_count);
|
||
}
|
||
|
||
/*
|
||
* test_pre_vote_reply_out_of_range_peer_ignored
|
||
*
|
||
* A peer_idx outside [0, n_peers) (or >= RAFT_MAX_PEERS) is ignored: no tally
|
||
* change, round stays in progress, returns PENDING.
|
||
*/
|
||
static void test_pre_vote_reply_out_of_range_peer_ignored(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, arm_pre_vote_round(&s, &cbs, 3, 0, 5));
|
||
|
||
int rc_neg = raft_on_pre_vote_reply(&s, -1, 1 /* grant */);
|
||
int rc_over = raft_on_pre_vote_reply(&s, 3, 1 /* grant */); /* == n_peers */
|
||
int rc_max = raft_on_pre_vote_reply(&s, RAFT_MAX_PEERS, 1);
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_PENDING, rc_neg);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_PENDING, rc_over);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_PENDING, rc_max);
|
||
|
||
TEST_ASSERT_EQUAL_INT(1, s.pre_votes_granted); /* self only, no spurious count */
|
||
TEST_ASSERT_EQUAL_INT(1, s.pre_vote_in_progress);
|
||
}
|
||
|
||
/*
|
||
* test_pre_vote_reply_5node_won_at_three
|
||
*
|
||
* 5-node cluster (quorum=3): self + two granting peers → WON.
|
||
*/
|
||
static void test_pre_vote_reply_5node_won_at_three(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, arm_pre_vote_round(&s, &cbs, 5, 0, 5));
|
||
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_PENDING,
|
||
raft_on_pre_vote_reply(&s, 1, 1));
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_WON,
|
||
raft_on_pre_vote_reply(&s, 2, 1));
|
||
|
||
TEST_ASSERT_EQUAL_INT(3, s.pre_votes_granted);
|
||
TEST_ASSERT_EQUAL_INT(0, s.pre_vote_in_progress);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_follower_count);
|
||
}
|
||
|
||
/* ====================================================================== *
|
||
* Task 6.1 — Raft safety-invariant assertions for the PreVote API
|
||
*
|
||
* The per-function tests above (tasks 2.1/2.2/2.3) check individual cases.
|
||
* The tests below assert the SAFETY INVARIANTS as *properties* that hold
|
||
* across the ENTIRE PreVote API, mechanically backing the RN-1 TLA+/
|
||
* verification-checklist consistency argument recorded in
|
||
* .kiro/specs/ha-prevote/research.md (§"RN-1 resolved").
|
||
*
|
||
* ---------------------------------------------------------------------- *
|
||
* RN-1 CONSISTENCY ARGUMENT (mechanically evidenced below)
|
||
* ---------------------------------------------------------------------- *
|
||
* Claim: adding the PreVote phase preserves every Raft safety invariant
|
||
* the repository's `raft/raft.tla` reference and the controller
|
||
* verification checklist require — Election Safety (at most one leader per
|
||
* term), Leader Completeness, term monotonicity, and a monotonic commit
|
||
* index — so the system stays consistent after the change.
|
||
*
|
||
* Proof structure (purity ⇒ no new transitions):
|
||
*
|
||
* 1. The three PreVote functions — raft_begin_pre_vote,
|
||
* raft_on_pre_vote_request, raft_on_pre_vote_reply — are PURE with
|
||
* respect to the persistent Raft state. Across an arbitrary sequence of
|
||
* begin / request / reply calls (mixed grant+deny, duplicates,
|
||
* out-of-range peers, and both WON and LOST terminal outcomes), none of
|
||
* them ever:
|
||
* - changes s->term, s->voted_for, s->voted_for_term, or s->role, or
|
||
* - invokes on_persist, or
|
||
* - invokes on_become_leader / on_become_follower.
|
||
* (Asserted by test_invariant_prevote_sequence_pure_no_persist and
|
||
* test_invariant_prevote_won_grants_no_leadership.)
|
||
*
|
||
* 2. Because the PreVote path mutates no term, it cannot violate term
|
||
* monotonicity: the only writer of s->term remains raft_start_election
|
||
* (real term bump) and raft_on_vote_request Step 2 (adopt a strictly
|
||
* higher term) — both UNCHANGED by this feature. A PreVote can only
|
||
* *gate* whether raft_start_election is later called; it never advances
|
||
* a term itself. (Asserted by the term-constant checks below.)
|
||
*
|
||
* 3. Because the PreVote path creates no leader (no on_become_leader, no
|
||
* role := RAFT_LEADER), it adds no new way to satisfy the antecedent of
|
||
* Election Safety. The sole leadership-creating transitions remain
|
||
* raft_start_election's single-node short-circuit and
|
||
* raft_on_vote_reply's quorum branch — again UNCHANGED. A PreVote round
|
||
* reaching RAFT_PRE_VOTE_WON returns a STATUS only; the node stays
|
||
* RAFT_FOLLOWER until the separate, unchanged real-election path runs.
|
||
* (Asserted by test_invariant_prevote_won_grants_no_leadership.)
|
||
*
|
||
* 4. The legitimate higher-term-adopt failover path (the bug-339/bug-340
|
||
* fix) lives entirely in raft_on_vote_request / raft_on_vote_reply,
|
||
* which this feature does not touch. PreVote sits strictly *before* that
|
||
* path and, by (1), leaves its inputs (term/voted_for/role) untouched.
|
||
* test_invariant_real_vote_higher_term_adopt_unchanged demonstrates the
|
||
* real-vote path still adopts a higher term and fires become_follower /
|
||
* become_leader exactly as before, even after a full PreVote round has
|
||
* run on the same node — so PreVote did not alter the legitimate
|
||
* failover semantics bug-339/bug-340 depend on.
|
||
*
|
||
* Conclusion: PreVote introduces no transition that writes a term or
|
||
* creates a leader. Every term-writing / leadership-creating transition in
|
||
* the model is byte-for-byte the pre-PreVote transition. Therefore the set
|
||
* of reachable (term, leader) configurations is unchanged, and the TLA+
|
||
* invariants (Election Safety, Leader Completeness, term monotonicity,
|
||
* monotonic commit index) and the controller verification checklist
|
||
* continue to hold. The tests below are the mechanical evidence for
|
||
* premises (1)–(4).
|
||
* ====================================================================== */
|
||
|
||
/*
|
||
* test_invariant_prevote_sequence_pure_no_persist (Req 6.2, 2.3, 1.2)
|
||
*
|
||
* PROPERTY (term monotonicity / no persistent mutation): drive a long,
|
||
* mixed sequence of PreVote operations through a node and assert that across
|
||
* the WHOLE sequence the persistent Raft state (term, voted_for,
|
||
* voted_for_term, role) never changes and on_persist is NEVER called.
|
||
*
|
||
* The sequence deliberately exercises: begin → answer an incoming request
|
||
* (grant) → answer a stale-term request (deny) → reply tally with a grant,
|
||
* a duplicate of that grant, an out-of-range peer, and a deny — i.e. every
|
||
* PreVote entry point and both grant/deny outcomes, including a WON
|
||
* terminal. If ANY PreVote code path leaked a term/vote/role write or a
|
||
* persist, this property fails — which would be a real Election-Safety /
|
||
* term-monotonicity finding, not a test bug.
|
||
*/
|
||
static void test_invariant_prevote_sequence_pure_no_persist(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_vote_eligible = mock_vote_eligible;
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
g_mock.vote_eligible_return_value = 1; /* grant when consulted */
|
||
|
||
/* 3-node FOLLOWER at term=5, having voted for peer 1 in an earlier term.
|
||
* These persistent values are the canary: nothing below may change them. */
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 5));
|
||
s.voted_for = 1;
|
||
s.voted_for_term = 4;
|
||
|
||
const uint64_t term0 = s.term;
|
||
const int voted_for0 = s.voted_for;
|
||
const uint64_t voted_for_term0 = s.voted_for_term;
|
||
const raft_role_t role0 = s.role;
|
||
|
||
/* (a) begin a round — self-grant + prospective term, no persist */
|
||
TEST_ASSERT_EQUAL_INT(0, raft_begin_pre_vote(&s));
|
||
|
||
/* (b) answer an incoming PreVote request that PASSES eligibility — grant */
|
||
TEST_ASSERT_EQUAL_INT(1, raft_on_pre_vote_request(&s, 2, 6 /* higher */));
|
||
|
||
/* (c) answer a STALE-term incoming request — deny */
|
||
TEST_ASSERT_EQUAL_INT(0, raft_on_pre_vote_request(&s, 2, 3 /* stale */));
|
||
|
||
/* (d) answer an incoming request the eligibility gate REJECTS — deny */
|
||
g_mock.vote_eligible_return_value = 0;
|
||
TEST_ASSERT_EQUAL_INT(0, raft_on_pre_vote_request(&s, 2, 6));
|
||
g_mock.vote_eligible_return_value = 1;
|
||
|
||
/* (e) tally replies: a grant (drives to WON quorum on 3-node), then a
|
||
* duplicate of the same grant, an out-of-range peer, and a deny. */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_WON,
|
||
raft_on_pre_vote_reply(&s, 1, 1 /* grant */));
|
||
/* round closed after WON; further replies are no-ops on persistent state */
|
||
(void)raft_on_pre_vote_reply(&s, 1, 1 /* duplicate grant */);
|
||
(void)raft_on_pre_vote_reply(&s, 99, 1 /* out-of-range */);
|
||
(void)raft_on_pre_vote_reply(&s, 2, 0 /* late deny */);
|
||
|
||
/* INVARIANT: persistent Raft state byte-for-byte unchanged. */
|
||
TEST_ASSERT_EQUAL_UINT64(term0, s.term);
|
||
TEST_ASSERT_EQUAL_INT(voted_for0, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(voted_for_term0, s.voted_for_term);
|
||
TEST_ASSERT_EQUAL_INT(role0, s.role);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role); /* never promoted */
|
||
|
||
/* INVARIANT: PreVote never persists and never fires leadership callbacks. */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_follower_count);
|
||
}
|
||
|
||
/*
|
||
* test_invariant_prevote_lost_sequence_pure_no_persist (Req 6.2, 1.4)
|
||
*
|
||
* Same purity property as above, but driving the round to the LOST terminal
|
||
* outcome (all peers deny). A WON path and a LOST path are the two ways a
|
||
* round can end; both must be side-effect-free. This guards the case where
|
||
* a frozen-then-resumed standby gets no PreVote majority (Req 4) — the round
|
||
* must leave term/vote/role untouched so the node simply re-attaches.
|
||
*/
|
||
static void test_invariant_prevote_lost_sequence_pure_no_persist(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
cbs.on_trace = mock_trace;
|
||
reset_mock();
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 9));
|
||
s.voted_for = 0;
|
||
s.voted_for_term = 9;
|
||
|
||
const uint64_t term0 = s.term;
|
||
const int voted_for0 = s.voted_for;
|
||
const uint64_t voted_for_term0 = s.voted_for_term;
|
||
const raft_role_t role0 = s.role;
|
||
|
||
TEST_ASSERT_EQUAL_INT(0, raft_begin_pre_vote(&s));
|
||
|
||
/* both peers deny → LOST, no majority */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_PENDING,
|
||
raft_on_pre_vote_reply(&s, 1, 0));
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_LOST,
|
||
raft_on_pre_vote_reply(&s, 2, 0));
|
||
|
||
/* INVARIANT: persistent state unchanged across a LOST round. */
|
||
TEST_ASSERT_EQUAL_UINT64(term0, s.term);
|
||
TEST_ASSERT_EQUAL_INT(voted_for0, s.voted_for);
|
||
TEST_ASSERT_EQUAL_UINT64(voted_for_term0, s.voted_for_term);
|
||
TEST_ASSERT_EQUAL_INT(role0, s.role);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_follower_count);
|
||
}
|
||
|
||
/*
|
||
* test_invariant_prevote_won_grants_no_leadership (Req 6.1)
|
||
*
|
||
* ELECTION SAFETY property: a PreVote round that reaches RAFT_PRE_VOTE_WON
|
||
* grants NO leadership. The node must remain RAFT_FOLLOWER and no
|
||
* on_become_leader / on_become_follower callback may fire — a PreVote WON is
|
||
* a STATUS the controller acts on, not a leadership transition. Only the
|
||
* separate, unchanged raft_start_election path creates a leader.
|
||
*
|
||
* The test then demonstrates the contrast: invoking the real
|
||
* raft_start_election (the only leadership-creating path) from the same
|
||
* still-FOLLOWER node bumps the term and self-votes — proving the leader is
|
||
* created exclusively by the real path, never by the PreVote WON itself.
|
||
*/
|
||
static void test_invariant_prevote_won_grants_no_leadership(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
|
||
reset_mock();
|
||
/* arm a round on a 3-node FOLLOWER at term=5 (self-grant in progress) */
|
||
TEST_ASSERT_EQUAL_INT(0, arm_pre_vote_round(&s, &cbs, 3, 0, 5));
|
||
|
||
const uint64_t term_before_won = s.term;
|
||
|
||
/* one peer grant → WON on a 3-node cluster (quorum=2) */
|
||
int rc = raft_on_pre_vote_reply(&s, 1, 1 /* grant */);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_PRE_VOTE_WON, rc);
|
||
|
||
/* INVARIANT (Election Safety): WON created NO leader. */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role); /* still a follower */
|
||
TEST_ASSERT_EQUAL_UINT64(term_before_won, s.term); /* term not advanced */
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_leader_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.become_follower_count);
|
||
TEST_ASSERT_EQUAL_INT(0, g_mock.persist_count);
|
||
|
||
/* CONTRAST: leadership is created ONLY by the unchanged real path.
|
||
* Starting the real election now bumps the term + records the self-vote
|
||
* (this is the sole term-writing / leadership-creating transition). */
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(RAFT_OK, raft_start_election(&s));
|
||
TEST_ASSERT_EQUAL_INT(RAFT_CANDIDATE, s.role);
|
||
TEST_ASSERT_EQUAL_UINT64(term_before_won + 1, s.term); /* real bump here */
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.persist_count); /* persisted here */
|
||
}
|
||
|
||
/*
|
||
* test_invariant_real_vote_higher_term_adopt_unchanged (Req 5.2, 5.3)
|
||
*
|
||
* REAL-VOTE-PATH-UNCHANGED property: PreVote must not have altered the
|
||
* legitimate higher-term-adopt failover path that the bug-339/bug-340 fixes
|
||
* depend on. After running a full PreVote round on a node, the real
|
||
* raft_on_vote_request still adopts a strictly higher term and steps a
|
||
* leader down (fires on_become_follower), and raft_on_vote_reply still wins
|
||
* at quorum (fires on_become_leader) — exactly as before PreVote existed.
|
||
*
|
||
* This is the library-level guard for bug-339 (higher-term adopt on
|
||
* RDHUP failover) and bug-340 (rejoin), confirming PreVote sits beside the
|
||
* real-vote path without modifying it.
|
||
*/
|
||
static void test_invariant_real_vote_higher_term_adopt_unchanged(void)
|
||
{
|
||
raft_state_t s;
|
||
raft_callbacks_t cbs = make_mock_cbs();
|
||
uint64_t reply_term = 0;
|
||
|
||
cbs.on_trace = mock_trace;
|
||
|
||
/* --- Part 1: higher-term real RequestVote adopts term + steps down a
|
||
* leader, even after a PreVote round ran on this node. --- */
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_vote_node(&s, &cbs, 3, 0, 2));
|
||
|
||
/* Run a (lost) PreVote round first to prove it leaves the real-vote
|
||
* adopt path untouched. */
|
||
TEST_ASSERT_EQUAL_INT(0, raft_begin_pre_vote(&s));
|
||
(void)raft_on_pre_vote_reply(&s, 1, 0);
|
||
(void)raft_on_pre_vote_reply(&s, 2, 0);
|
||
TEST_ASSERT_EQUAL_UINT64(2, s.term); /* PreVote did not move the term */
|
||
|
||
/* Now this node is the leader in term 2 and a real higher-term vote
|
||
* request arrives — the unchanged Step 2 must adopt term 5 and step down. */
|
||
s.role = RAFT_LEADER;
|
||
s.voted_for = 0;
|
||
s.voted_for_term = 2;
|
||
reset_mock();
|
||
|
||
int rc = raft_on_vote_request(&s, 1, 5, &reply_term);
|
||
|
||
/* Higher-term adopt + leader step-down, exactly as bug-339/340 require. */
|
||
TEST_ASSERT_EQUAL_UINT64(5, s.term);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_FOLLOWER, s.role);
|
||
TEST_ASSERT_EQUAL_UINT64(5, reply_term);
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.become_follower_count); /* stepped down */
|
||
TEST_ASSERT_EQUAL_INT(RAFT_GRANT, rc); /* then grants */
|
||
|
||
/* --- Part 2: real raft_on_vote_reply still elects a leader at quorum,
|
||
* unaffected by PreVote. --- */
|
||
reset_mock();
|
||
TEST_ASSERT_EQUAL_INT(0, init_node(&s, &cbs, 3, 0));
|
||
s.role = RAFT_CANDIDATE;
|
||
s.term = 1;
|
||
s.votes_granted = 1; /* self-vote */
|
||
s.replies_received = 0;
|
||
s.election_decided = 0;
|
||
|
||
int rcr = raft_on_vote_reply(&s, 1, 1 /* grant */, 1);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_BECAME_LEADER, rcr);
|
||
TEST_ASSERT_EQUAL_INT(RAFT_LEADER, s.role);
|
||
TEST_ASSERT_EQUAL_INT(1, g_mock.become_leader_count); /* real path elects */
|
||
}
|
||
|
||
/* ---------- test_raft entry point ---------- */
|
||
|
||
void test_raft(void)
|
||
{
|
||
printf("\n>> raft test\n\n");
|
||
|
||
RUN_TEST(test_raft_init_null_send_vote_request_returns_einval);
|
||
RUN_TEST(test_raft_init_null_become_leader_returns_einval);
|
||
RUN_TEST(test_raft_init_null_become_follower_returns_einval);
|
||
RUN_TEST(test_raft_init_null_persist_returns_einval);
|
||
RUN_TEST(test_raft_init_null_schedule_timeout_returns_einval);
|
||
RUN_TEST(test_raft_init_null_cancel_timeout_returns_einval);
|
||
RUN_TEST(test_raft_init_null_start_election_after_delay_returns_einval);
|
||
RUN_TEST(test_raft_init_even_peers_returns_einval);
|
||
RUN_TEST(test_raft_init_zero_peers_returns_einval);
|
||
RUN_TEST(test_raft_init_success_fields);
|
||
RUN_TEST(test_raft_init_default_election_timeout);
|
||
RUN_TEST(test_raft_init_optional_callbacks_null_succeeds);
|
||
RUN_TEST(test_raft_snapshot_returns_current_state);
|
||
|
||
/* raft_start_election (task 3.2) */
|
||
RUN_TEST(test_start_election_from_follower_3node);
|
||
RUN_TEST(test_start_election_single_node);
|
||
RUN_TEST(test_start_election_already_candidate);
|
||
RUN_TEST(test_start_election_already_leader);
|
||
|
||
/* raft_on_vote_reply (task 3.4) */
|
||
RUN_TEST(test_vote_reply_higher_term_steps_down);
|
||
RUN_TEST(test_vote_reply_noop_after_decided);
|
||
RUN_TEST(test_vote_reply_quorum_3node_1grant);
|
||
RUN_TEST(test_vote_reply_no_quorum_all_replied_3node);
|
||
RUN_TEST(test_vote_reply_quorum_5node);
|
||
RUN_TEST(test_vote_reply_pending_waiting);
|
||
|
||
/* raft_on_vote_request (task 3.3) */
|
||
RUN_TEST(test_vote_req_stale_term);
|
||
RUN_TEST(test_vote_req_higher_term_updates_state);
|
||
RUN_TEST(test_vote_req_same_term_already_voted_different);
|
||
RUN_TEST(test_vote_req_same_term_idempotent_same_candidate);
|
||
RUN_TEST(test_vote_req_leader_denies);
|
||
RUN_TEST(test_vote_req_on_vote_eligible_denies);
|
||
RUN_TEST(test_vote_req_on_vote_eligible_grants);
|
||
RUN_TEST(test_vote_req_on_vote_eligible_null);
|
||
RUN_TEST(test_vote_req_persist_fails);
|
||
RUN_TEST(test_vote_req_reply_term_always_set);
|
||
|
||
/* raft_on_election_timeout, raft_on_leader_lost, raft_check_and_start_election (task 3.5) */
|
||
RUN_TEST(test_election_timeout_undecided);
|
||
RUN_TEST(test_election_timeout_already_decided);
|
||
RUN_TEST(test_leader_lost_clears_voted_for);
|
||
RUN_TEST(test_check_and_start_voted_for_other);
|
||
RUN_TEST(test_check_and_start_not_voted);
|
||
RUN_TEST(test_check_and_start_voted_for_self);
|
||
|
||
/* raft_on_pre_vote_request (task 2.1) */
|
||
RUN_TEST(test_pre_vote_req_grant_higher_term_eligible);
|
||
RUN_TEST(test_pre_vote_req_grant_equal_term_eligible);
|
||
RUN_TEST(test_pre_vote_req_deny_stale_term);
|
||
RUN_TEST(test_pre_vote_req_deny_eligibility_rejects);
|
||
RUN_TEST(test_pre_vote_req_null_eligible_grants);
|
||
RUN_TEST(test_pre_vote_req_grant_preserves_existing_vote);
|
||
|
||
/* raft_begin_pre_vote (task 2.2) */
|
||
RUN_TEST(test_begin_pre_vote_uses_prospective_term_not_persisted);
|
||
RUN_TEST(test_begin_pre_vote_sends_once_per_non_self_peer);
|
||
RUN_TEST(test_begin_pre_vote_self_grant_and_in_progress);
|
||
RUN_TEST(test_begin_pre_vote_purity_no_persistent_mutation);
|
||
RUN_TEST(test_begin_pre_vote_single_node_wins);
|
||
RUN_TEST(test_begin_pre_vote_null_send_callback_suppressed);
|
||
|
||
/* raft_on_pre_vote_reply tally (task 2.3) */
|
||
RUN_TEST(test_pre_vote_reply_won_at_quorum);
|
||
RUN_TEST(test_pre_vote_reply_lost_when_all_reply_no_quorum);
|
||
RUN_TEST(test_pre_vote_reply_pending_when_undecided);
|
||
RUN_TEST(test_pre_vote_reply_duplicate_ignored);
|
||
RUN_TEST(test_pre_vote_reply_won_purity_state_unchanged);
|
||
RUN_TEST(test_pre_vote_reply_lost_purity_state_unchanged);
|
||
RUN_TEST(test_pre_vote_reply_out_of_range_peer_ignored);
|
||
RUN_TEST(test_pre_vote_reply_5node_won_at_three);
|
||
|
||
/* Raft safety-invariant assertions for the PreVote API (task 6.1, RN-1) */
|
||
RUN_TEST(test_invariant_prevote_sequence_pure_no_persist);
|
||
RUN_TEST(test_invariant_prevote_lost_sequence_pure_no_persist);
|
||
RUN_TEST(test_invariant_prevote_won_grants_no_leadership);
|
||
RUN_TEST(test_invariant_real_vote_higher_term_adopt_unchanged);
|
||
|
||
/* simulator init (task 4.1) */
|
||
#ifdef XCE_TESTING
|
||
RUN_TEST(test_sim_init_3node);
|
||
RUN_TEST(test_sim_trace_buf);
|
||
|
||
/* simulator network operations (task 4.2) */
|
||
RUN_TEST(test_sim_3node_election_one_leader);
|
||
RUN_TEST(test_sim_start_all_elections_no_winner);
|
||
RUN_TEST(test_sim_partition_no_quorum);
|
||
RUN_TEST(test_sim_fire_timeout_steps_down);
|
||
|
||
/* Group A: basic election correctness (task 5.1) */
|
||
RUN_TEST(test_proto_A1_single_node_self_elects);
|
||
RUN_TEST(test_proto_A2_3node_one_leader);
|
||
RUN_TEST(test_proto_A3_late_election_denied);
|
||
RUN_TEST(test_proto_A4_5node_quorum_3);
|
||
RUN_TEST(test_proto_A5_leader_denies_vote_request);
|
||
|
||
/* Group B: voted_for invariant (task 5.1) */
|
||
RUN_TEST(test_proto_B1_one_vote_per_term);
|
||
RUN_TEST(test_proto_B2_higher_term_updates_state);
|
||
RUN_TEST(test_proto_B3_stale_term_denied);
|
||
RUN_TEST(test_proto_B4_different_candidate_denied);
|
||
RUN_TEST(test_proto_B5_idempotent_same_candidate);
|
||
|
||
/* Group C: on_vote_eligible policy callback (task 5.2) */
|
||
RUN_TEST(test_proto_C1_eligible_denies);
|
||
RUN_TEST(test_proto_C2_eligible_grants);
|
||
RUN_TEST(test_proto_C3_eligible_null_grants);
|
||
RUN_TEST(test_proto_C4_stale_term_no_eligible_call);
|
||
RUN_TEST(test_proto_C5_already_voted_no_eligible_call);
|
||
|
||
/* Group H: Persistence and restart (task 5.2) */
|
||
RUN_TEST(test_proto_H1_init_with_persisted_state);
|
||
RUN_TEST(test_proto_H2_init_first_boot);
|
||
RUN_TEST(test_proto_H3_persist_before_vote_recorded);
|
||
RUN_TEST(test_proto_H4_persist_fail_denies);
|
||
RUN_TEST(test_proto_H5_start_election_self_vote_persisted);
|
||
RUN_TEST(test_proto_H6_restored_vote_blocks_second_vote);
|
||
RUN_TEST(test_proto_Hnull_required_callback_einval);
|
||
|
||
/* Group D: Quorum and Result (task 5.3) */
|
||
RUN_TEST(test_proto_D1_quorum_1grant_of_2_needed);
|
||
RUN_TEST(test_proto_D2_both_peers_deny_becomes_follower);
|
||
RUN_TEST(test_proto_D3_second_vote_reply_noop);
|
||
RUN_TEST(test_proto_D4_reply_higher_term_steps_down);
|
||
|
||
/* Group E: Election Timeout (task 5.3) */
|
||
RUN_TEST(test_proto_E1_timeout_before_quorum);
|
||
RUN_TEST(test_proto_E2_timeout_after_quorum_noop);
|
||
RUN_TEST(test_proto_E3_new_election_after_timeout);
|
||
|
||
/* Group F: RDHUP Failover (task 5.4) */
|
||
RUN_TEST(test_proto_F1_leader_lost_priority_delay);
|
||
RUN_TEST(test_proto_F2_voted_during_delay_skip);
|
||
RUN_TEST(test_proto_F3_no_vote_during_delay_starts_election);
|
||
RUN_TEST(test_proto_F4_simultaneous_rdhup_one_leader);
|
||
|
||
/* Group G: Split-Brain Prevention (task 5.4) */
|
||
RUN_TEST(test_proto_G1_no_split_brain_100_rounds);
|
||
RUN_TEST(test_proto_G2_partition_minority_no_quorum);
|
||
#endif
|
||
}
|