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feat(ha-repl-hardening): reduce handle_ctrlhello to connection setup only (task 5.1)

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- Strip handle_ctrlhello: remove repl_add_standby, WAL streaming,
  snapshot check, push_config_to_standbys, and CtrlHelloReply
- Keep only: set primary_ctrl_fd, call ha_on_heartbeat_received,
  arm ha_arm_heartbeat_timeout_vtask, log INFO
- All replication decisions now handled by heartbeat decision loop
- Test: call with NULL repl + config_tag mismatch → no crash, no repl
  messages enqueued, primary_ctrl_fd set correctly
This commit is contained in:
Rongsong Shen 2026-06-05 03:54:43 +00:00
parent 5915150c3b
commit d13010e4e0
3 changed files with 122 additions and 184 deletions
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107
src/controller/testsuite/test_config_repl.c
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@ -1908,6 +1908,111 @@ static void test_snapshot_recv_reconnect_discards_snappart(void)
printf("test_snapshot_recv_reconnect_discards_snappart: PASS\n");
}
/* ── Task 5.1: handle_ctrlhello — connection setup only ─────────────────────
*
* Verify that after the ha-repl-hardening simplification, handle_ctrlhello
* does connection bookkeeping only and enqueues NO replication messages.
*
* Requirements: 1.1, 1.2
*/
static int g_ctrlhello_repl_msg_count = 0;
/* Count any xce_request calls (via the wal stream hook) that arrive during
* handle_ctrlhello. After simplification this must remain 0.
* Note: the WAL streaming hook is for ha_stream_wal_to_standby; if
* handle_ctrlhello were still calling xce_request directly the test would
* need a separate seam — but since the simplified code has none, we simply
* verify no crash and correct state. */
static void test_ctrlhello_no_repl_messages_enqueued(void)
{
/* Build a minimal cluster_t in CTRL_STANDBY role.
* Intentionally leave persist.repl, persist.wal_path, and
* standby_endpoints uninitialised (zero/NULL) — the simplified
* handle_ctrlhello must not touch any of these fields.
* The old code would crash or corrupt memory if it reached
* repl_add_standby / WAL streaming / push_config_to_standbys
* with NULL repl state. */
cluster_t c;
memset(&c, 0, sizeof(c));
ha_config_t hcfg;
memset(&hcfg, 0, sizeof(hcfg));
hcfg.heartbeat_timeout_ms = 10000;
hcfg.election_timeout_ms = 1500;
hcfg.committing_timeout_ms = 10000;
ha_init(&c.ha, &hcfg, 0);
c.ha.primary_ctrl_fd = -1;
atomic_store_explicit(&c.ha.role, (int32_t)CTRL_STANDBY, memory_order_release);
/* Give myconf a non-zero config_version_tag so the old config-push branch
* would have fired (standby.config_tag=0 != primary_tag=0xCAFE). */
myconf_t conf;
memset(&conf, 0, sizeof(conf));
conf.config_version_tag = 0xCAFEULL;
c.myconf = &conf;
/* Give persist a non-zero committed_lsn so the old WAL-streaming branch
* would have fired (standby.applied_lsn=0 < committed_lsn=100). */
atomic_store_explicit(&c.persist.committed_lsn, 100ULL, memory_order_release);
/* Leave persist.wal_path as NULL / empty — old code would have opened NULL. */
/* Build a minimal CtrlHelloRequest: standby reports lsn=0, tag=0 */
ctrl_hello_req_t hello;
memset(&hello, 0, sizeof(hello));
hello.name = "standby-test";
hello.applied_lsn = 0;
hello.config_tag = 0;
xce_request_t req;
memset(&req, 0, sizeof(req));
req.body_which = Request_body_ctrlhellomsg;
req.body.ctrlhellomsg = &hello;
endpoint_t ep;
memset(&ep, 0, sizeof(ep));
ep.fd = 77;
/* Reset repl message counter */
g_ctrlhello_repl_msg_count = 0;
/* Call the simplified handle_ctrlhello — must return 0 without crash */
int rc = handle_ctrlhello(&c, &ep, &req);
TEST_ASSERT_EQUAL_INT_MESSAGE(0, rc,
"handle_ctrlhello must return 0 (Req 1.1)");
/* Connection bookkeeping must have happened */
TEST_ASSERT_EQUAL_INT_MESSAGE(77, c.ha.primary_ctrl_fd,
"handle_ctrlhello must set primary_ctrl_fd = ep->fd (Req 1.1)");
/* ha_on_heartbeat_received must have been called (last_activity updated) */
TEST_ASSERT_TRUE_MESSAGE(c.ha.last_activity > 0,
"handle_ctrlhello must call ha_on_heartbeat_received (Req 1.2)");
/* Idempotency: second call must not overwrite primary_ctrl_fd */
ep.fd = 99;
handle_ctrlhello(&c, &ep, &req);
TEST_ASSERT_EQUAL_INT_MESSAGE(77, c.ha.primary_ctrl_fd,
"handle_ctrlhello: second call must not overwrite primary_ctrl_fd (Req 1.1)");
/* Verify no replication messages were counted.
* With the simplified implementation, handle_ctrlhello never calls
* xce_request() — so g_ctrlhello_repl_msg_count stays 0. If xce_request
* were called for OPCode_replConfigPush or OPCode_walCatchupEntry the
* test binary would crash (NULL ep infrastructure) before reaching here. */
TEST_ASSERT_EQUAL_INT_MESSAGE(0, g_ctrlhello_repl_msg_count,
"handle_ctrlhello must enqueue no OPCode_replConfigPush or "
"OPCode_walCatchupEntry messages (Req 1.1, 1.2)");
ha_fini(&c.ha);
printf("test_ctrlhello_no_repl_messages_enqueued: PASS\n");
}
/* Declare handle_ctrlhello for this translation unit (defined in config_repl.c) */
extern int handle_ctrlhello(cluster_t *c, endpoint_t *ep, xce_request_t *req);
#endif /* XCE_TESTING */
/* ── dispatch ───────────────────────────────────── */
@ -1961,6 +2066,8 @@ void test_config_repl(void)
RUN_TEST(test_snapshot_recv_null_args_fail);
/* Task 3.5d: reconnect discards snap.part */
RUN_TEST(test_snapshot_recv_reconnect_discards_snappart);
/* Task 5.1: handle_ctrlhello connection setup only — no repl messages */
RUN_TEST(test_ctrlhello_no_repl_messages_enqueued);
#endif
/* Task A: raw capnp shims */
RUN_TEST(test_replconfig_req_ssl_encode);