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feat: P2-4 wire repl_broadcast into persist_wal_async/sync_append; last_replicated_crc

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- Move repl.h from controller/ to include/ (shared header) to break
  persist.h ↔ repl.h circular include
- Extract wal_entry_hdr_t + wal_entry_type into include/wal_types.h so
  repl.h can include only what it needs without pulling in all of persist.h
- Add replicator_t repl field to persist_t (embedded by value, P2-4)
- Wire repl_init/repl_fini into persist_init/persist_fini lifecycle
- Wire repl_broadcast into persist_wal_async after each WAL write;
  last_replicated_crc updated here (not in persist_write_checkpoint_marker)
- Wire repl_wait_ack into persist_wal_sync_append; returns 0 on local
  WAL success; sync_rc_out carries -ENODEV/-ETIMEDOUT for degraded mode
- Add 4 TDD tests in test_persist_repl.c: structural repl field check,
  async no-standbys succeeds, sync degraded mode rc, checkpoint CRC invariant
This commit is contained in:
Rongsong Shen 2026-05-07 17:54:48 +00:00
parent d326ee1b2e
commit 3563d7387b
7 changed files with 228 additions and 41 deletions
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39
src/include/persist.h
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@ -6,44 +6,12 @@
#include <stdint.h>
#include "config.h"
#include "wal_types.h" /* wal_entry_hdr_t, wal_entry_type — P2-4: shared with repl.h */
#include "repl.h" /* replicator_t — P2-4: embedded in persist_t */
/* Forward declaration */
typedef struct cluster_s cluster_t;
/* ============================================================
* WAL entry header — 40 bytes, 8-byte aligned (Part 2.2)
* ============================================================ */
typedef struct {
uint64_t term; /* Election term (incremented on failover) */
uint64_t lsn; /* Log sequence number within this term */
uint64_t timestamp; /* Epoch microseconds */
uint32_t type; /* wal_entry_type enum value */
uint32_t payload_len; /* Bytes of payload following this header */
uint32_t crc; /* CRC32(header[0..WAL_HDR_CRC_SIZE-1] + payload) */
uint32_t prev_crc; /* CRC of previous record; WAL_CRC_NONE for first in segment */
} wal_entry_hdr_t;
_Static_assert(sizeof(wal_entry_hdr_t) == 40,
"wal_entry_hdr_t must be 40 bytes for on-disk format stability");
/* ============================================================
* WAL entry types (Part 2.3)
* ============================================================ */
typedef enum {
WAL_JOB_SUBMIT = 1, /* SYNC replication */
WAL_JOB_START = 2,
WAL_JOB_FINISH = 3,
WAL_JOB_FAIL = 4,
WAL_JOB_STOP = 5,
WAL_JOB_RESUME = 6,
WAL_JOB_UPDATE = 7,
WAL_JOB_RUSAGE = 8,
WAL_JOB_CKPT = 9,
WAL_JOB_PREASON = 10,
WAL_QUEUE_CTRL = 20,
WAL_WORKER_CTRL = 30,
WAL_CHECKPOINT = 100, /* Local WAL marker only — never replicated */
} wal_entry_type;
/* ============================================================
* Persistence configuration (Part 2.6)
* ============================================================ */
@ -120,6 +88,9 @@ struct persist_s {
pthread_cond_t checkpoint_done;
pthread_mutex_t checkpoint_mutex;
pthread_t snap_thread;
/* Fan-out replicator — P2-4 */
replicator_t repl;
};
typedef struct persist_s persist_t;