feat(ha-repl-hardening): snapshot transfer integration and dispatch-path tests (task 3.5d)
- Add ha_repl_send_snapshot_hook seam in ha.c/ha.h for XCE_TESTING - test_dispatch_repl_action_send_snapshot: verifies SEND_SNAPSHOT decision triggers hook when standby_lsn < oldest_wal_lsn - test_snapshot_recv_two_chunks_assembles_and_renames: verifies standby assembles snap.part across chunks and renames on isLast=true - test_snapshot_recv_reconnect_discards_snappart: verifies O_TRUNC semantics on chunk_index==0 restart after reconnect - All tests pass under ASAN
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5 changed files with 207 additions and 2 deletions
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@ -1167,6 +1167,12 @@ int ha_dispatch_repl_action_for_standby(ha_state_t *ha,
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INFO("HA repl: standby[%d] lsn=%" PRIu64
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" < oldest_wal_lsn=%" PRIu64 " → requesting snapshot transfer",
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peer_idx, standby_lsn, oldest_wal_lsn);
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#ifdef XCE_TESTING
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if (ha_repl_send_snapshot_hook != NULL) {
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ha_repl_send_snapshot_hook(peer_idx);
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break;
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}
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#endif
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if (c && c->persist.snap_path[0]) {
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extern int ha_send_snapshot_to_standby(endpoint_t *, const char *,
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uint64_t);
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@ -1756,6 +1762,14 @@ int (*ha_repl_stream_wal_hook)(void *ep, const char *wal_path,
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uint64_t standby_lsn,
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uint64_t committed_lsn) = NULL;
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/*
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* ha_repl_send_snapshot_hook: test-only seam for ha_send_snapshot_to_standby.
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* When non-NULL, ha_dispatch_repl_action_for_standby() calls this INSTEAD OF
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* ha_send_snapshot_to_standby() when the decision is HA_REPL_SEND_SNAPSHOT.
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* Requirements: 4.1–4.5 (ha-repl-hardening)
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*/
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int (*ha_repl_send_snapshot_hook)(int peer_idx) = NULL;
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#endif /* XCE_TESTING */
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/* ── Election Evaluation (Req 2.1, 2.7, 2.8) ───────────────────────────────
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@ -565,7 +565,8 @@ void ha_repl_ack_received(ha_state_t *ha, cluster_t *c);
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* - HA_REPL_STREAM_WAL: calls ha_stream_wal_to_standby(ep, wal_path, standby_lsn,
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* committed_lsn) to batch-stream WAL entries via xce_request() (non-blocking).
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* In XCE_TESTING builds, calls ha_repl_stream_wal_hook if non-NULL.
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* - HA_REPL_SEND_SNAPSHOT: stub (Task 3.5).
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* - HA_REPL_SEND_SNAPSHOT: calls ha_send_snapshot_to_standby(ep, snap_path, lsn).
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* In XCE_TESTING builds, calls ha_repl_send_snapshot_hook(peer_idx) if non-NULL.
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* - HA_REPL_CONVERGED: no-op.
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*
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* One action per heartbeat cycle per standby (design §Unified Heartbeat-Driven
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@ -660,6 +661,20 @@ extern int (*ha_repl_stream_wal_hook)(void *ep, const char *wal_path,
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uint64_t standby_lsn,
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uint64_t committed_lsn);
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/*
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* ha_repl_send_snapshot_hook: test-only seam for ha_send_snapshot_to_standby.
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*
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* When non-NULL, ha_dispatch_repl_action_for_standby() calls this INSTEAD OF
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* ha_send_snapshot_to_standby() when the decision is HA_REPL_SEND_SNAPSHOT,
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* so unit tests can verify the wiring without requiring a real endpoint or
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* snapshot directory.
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*
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* Signature: int hook(int peer_idx)
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* peer_idx — 0-based index of the standby that triggered the snapshot
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* Requirements: 4.1–4.5 (ha-repl-hardening)
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*/
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extern int (*ha_repl_send_snapshot_hook)(int peer_idx);
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/*
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* ha_tcp_connect_hook: test-only seam for the raw TCP connect inside
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* ha_find_and_connect_to_primary. When non-NULL, the function calls this
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@ -1803,6 +1803,111 @@ static void test_snapshot_recv_null_args_fail(void)
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printf("test_snapshot_recv_null_args_fail: PASS\n");
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}
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/* Test 3.5d: reconnected standby discards snap.part and restarts from chunk 0.
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*
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* Design §Snapshot Transfer: "Mid-transfer reconnect always restarts snapshot
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* from chunk 0 — the standby discards its partial snap.part file on reconnect."
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* The discard (unlink) is done by the ctrlhello handler before the first chunk
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* of a new transfer arrives. This test verifies that:
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* 1. After receiving chunk 0 (creating snap.part), if the caller unlinks
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* snap.part (simulating reconnect/reset) and then calls ha_handle_snapshot_chunk
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* again with chunk_index=0, the function creates a fresh snap.part
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* (not appending to a previous stale file).
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* 2. The resulting snap.part contains only the new chunk's bytes (not a
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* concatenation of old + new data).
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*
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* Requirement: 4.4 (ha-repl-hardening) — retry by reconnecting initiates new transfer.
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*/
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static void test_snapshot_recv_reconnect_discards_snappart(void)
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{
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char tmpdir[] = "/tmp/xcectest_snapreconn_XXXXXX";
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TEST_ASSERT_NOT_NULL(mkdtemp(tmpdir));
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char snap_dir[512];
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snprintf(snap_dir, sizeof(snap_dir), "%s/snap", tmpdir);
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TEST_ASSERT_EQUAL_INT(0, mkdir(snap_dir, 0700));
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persist_t *p = calloc(1, sizeof(persist_t));
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TEST_ASSERT_NOT_NULL(p);
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persist_config_t pcfg = persist_config_defaults();
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persist_set_workdir(p, tmpdir, "ctrl-snapreconn");
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persist_init(p, &pcfg, NULL);
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persist_start(p);
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ha_state_t ha;
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snap_recv_ha_init(&ha);
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uint64_t snap_lsn = 300;
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uint8_t first[64];
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uint8_t second[64];
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memset(first, 0xAA, 64);
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memset(second, 0xBB, 64);
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/* ── First transfer attempt: send chunk 0 ── */
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snapshot_transfer_t c0;
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memset(&c0, 0, sizeof(c0));
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c0.snapshot_lsn = snap_lsn;
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c0.chunk_index = 0;
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c0.chunk_offset = 0;
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c0.total_size = 64; /* single-chunk transfer */
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c0.is_last = 0; /* not last — simulates partial in-flight transfer */
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int rc = ha_handle_snapshot_chunk(&ha, p, snap_dir, &c0, first, 64);
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TEST_ASSERT_EQUAL_INT(0, rc);
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/* snap.part must exist and contain exactly 64 bytes (first chunk) */
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char part_path[600];
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snprintf(part_path, sizeof(part_path), "%s/snap.part", snap_dir);
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struct stat st;
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TEST_ASSERT_EQUAL_INT_MESSAGE(0, stat(part_path, &st),
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"snap.part must exist after first chunk");
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TEST_ASSERT_EQUAL_UINT64_MESSAGE(64, (uint64_t)st.st_size,
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"snap.part must be 64 bytes after first chunk");
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/* ── Simulate reconnect: caller discards snap.part ── */
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TEST_ASSERT_EQUAL_INT_MESSAGE(0, unlink(part_path),
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"unlink snap.part must succeed (simulating reconnect)");
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/* ── Second transfer attempt: restart from chunk 0 ── */
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snapshot_transfer_t c0b;
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memset(&c0b, 0, sizeof(c0b));
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c0b.snapshot_lsn = snap_lsn;
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c0b.chunk_index = 0;
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c0b.chunk_offset = 0;
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c0b.total_size = 64;
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c0b.is_last = 0; /* still not last — just verifying discard */
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rc = ha_handle_snapshot_chunk(&ha, p, snap_dir, &c0b, second, 64);
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TEST_ASSERT_EQUAL_INT(0, rc);
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/* snap.part must exist and contain exactly 64 bytes (second chunk only,
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* not 128 bytes which would indicate old data was appended) */
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TEST_ASSERT_EQUAL_INT_MESSAGE(0, stat(part_path, &st),
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"snap.part must exist after reconnect chunk 0");
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TEST_ASSERT_EQUAL_UINT64_MESSAGE(64, (uint64_t)st.st_size,
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"snap.part must be 64 bytes (not 128) — stale data discarded");
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/* Verify the content is the second chunk (0xBB bytes), not the first (0xAA) */
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FILE *f = fopen(part_path, "rb");
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TEST_ASSERT_NOT_NULL_MESSAGE(f, "snap.part must be readable");
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uint8_t buf[64];
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size_t n = fread(buf, 1, 64, f);
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fclose(f);
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TEST_ASSERT_EQUAL_UINT64_MESSAGE(64, (uint64_t)n, "must read 64 bytes from snap.part");
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TEST_ASSERT_EQUAL_UINT8_MESSAGE(0xBB, buf[0],
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"snap.part content must be second chunk (0xBB), not first (0xAA)");
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ha_fini(&ha);
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persist_stop(p);
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persist_fini(p);
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free(p);
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char cmd[512];
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snprintf(cmd, sizeof(cmd), "rm -rf %s", tmpdir);
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system(cmd);
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printf("test_snapshot_recv_reconnect_discards_snappart: PASS\n");
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}
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#endif /* XCE_TESTING */
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/* ── dispatch ───────────────────────────────────── */
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@ -1854,6 +1959,8 @@ void test_config_repl(void)
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RUN_TEST(test_snapshot_recv_two_chunks_assembles_and_renames);
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RUN_TEST(test_snapshot_recv_size_mismatch_fails);
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RUN_TEST(test_snapshot_recv_null_args_fail);
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/* Task 3.5d: reconnect discards snap.part */
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RUN_TEST(test_snapshot_recv_reconnect_discards_snappart);
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#endif
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/* Task A: raw capnp shims */
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RUN_TEST(test_replconfig_req_ssl_encode);
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@ -480,6 +480,73 @@ static void test_dispatch_repl_action_no_push_when_converged(void)
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#endif
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}
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/* ── Task 3.5d: ha_dispatch_repl_action_for_standby SEND_SNAPSHOT wiring ────
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*
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* When standby_lsn < oldest_wal_lsn (standby predates WAL retention window),
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* ha_dispatch_repl_action_for_standby must call ha_send_snapshot_to_standby
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* (via ha_repl_send_snapshot_hook in XCE_TESTING builds).
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*
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* Requirements: 4.1 (ha-repl-hardening), design §Snapshot Transfer
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*/
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#ifdef XCE_TESTING
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extern int (*ha_repl_send_snapshot_hook)(int peer_idx);
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#endif
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/* Call-counting state for the snapshot hook */
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static int g_send_snapshot_count = 0;
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static int g_send_snapshot_idx = -1;
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static int stub_repl_send_snapshot(int peer_idx)
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{
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g_send_snapshot_count++;
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g_send_snapshot_idx = peer_idx;
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return 0;
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}
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/*
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* Test: when standby_lsn < oldest_wal_lsn (and standby_tag == committed_tag),
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* ha_dispatch_repl_action_for_standby must call ha_send_snapshot_to_standby
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* (via hook in test mode).
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*
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* Steps:
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* 1. Set ha->standby_reported_tag[0] = committed_tag (tag is current)
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* 2. Set ha->standby_reported_lsn[0] = 10 (behind oldest_wal_lsn=50)
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* 3. Call ha_dispatch_repl_action_for_standby(..., oldest_wal_lsn=50)
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* 4. Assert hook called once with peer_idx=0
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*
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* Requirements: 4.1 (snapshot when standby_lsn < oldest_wal_lsn)
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*/
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static void test_dispatch_repl_action_send_snapshot(void)
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{
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#ifdef XCE_TESTING
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ha_repl_send_snapshot_hook = stub_repl_send_snapshot;
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g_send_snapshot_count = 0;
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g_send_snapshot_idx = -1;
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ha_state_t *ha = build_ha_for_convergence_test();
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/* standby[0] has current config tag but LSN predates WAL window */
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ha->standby_reported_tag[0] = 5;
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ha->standby_reported_lsn[0] = 10; /* < oldest_wal_lsn=50 */
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int rc = ha_dispatch_repl_action_for_standby(
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ha, /*c=*/NULL, /*ep=*/NULL, /*peer_idx=*/0,
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/*committed_tag=*/5, /*committed_lsn=*/100, /*oldest_wal_lsn=*/50);
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(void)rc;
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TEST_ASSERT_EQUAL_INT_MESSAGE(1, g_send_snapshot_count,
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"SEND_SNAPSHOT: hook must fire once when standby_lsn < oldest_wal_lsn");
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TEST_ASSERT_EQUAL_INT_MESSAGE(0, g_send_snapshot_idx,
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"SEND_SNAPSHOT: hook must receive correct peer_idx=0");
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ha_fini(ha);
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ha_repl_send_snapshot_hook = NULL;
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printf("test_dispatch_repl_action_send_snapshot: PASS\n");
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#else
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printf("test_dispatch_repl_action_send_snapshot: SKIP (non-test build)\n");
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#endif
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}
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/* ── Task 3.2: ha_evaluate_repl_action unified decision tree ─────────────── */
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/*
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@ -597,6 +664,8 @@ void test_ha_role(void)
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/* Task 3.3: ha_dispatch_repl_action_for_standby PUSH_CONFIG wiring */
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RUN_TEST(test_dispatch_repl_action_push_config_when_tag_behind);
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RUN_TEST(test_dispatch_repl_action_no_push_when_converged);
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/* Task 3.5d: ha_dispatch_repl_action_for_standby SEND_SNAPSHOT wiring */
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RUN_TEST(test_dispatch_repl_action_send_snapshot);
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}
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/* test_am_i_primary suite deleted — am_i_primary() removed (election-iomgr-refactor) */
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