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feat(ha-repl-hardening): standby snapshot receive handler (task 3.5c)

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ha_handle_snapshot_chunk writes chunks to snap.part, on isLast verifies
total_size, atomic renames to snap-{lsn}.bin, loads via new
persist_load_snapshot wrapper, sets applied_lsn=checkpoint_lsn.
3 tests: 2-chunk assembly, size mismatch, null args. Wired into
myreq_handler OPCode_snapshotTransfer dispatch.
This commit is contained in:
Rongsong Shen 2026-06-05 01:43:05 +00:00
parent 318098c727
commit cbd91fca43
7 changed files with 361 additions and 2 deletions
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24
src/controller/ha.h
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@ -361,6 +361,30 @@ void ha_process_standby_state(ha_state_t *ha, int peer_idx,
uint64_t reported_tag, uint64_t reported_lsn,
uint64_t committed_tag, uint64_t committed_lsn);
/* ── Task 3.5c: Standby snapshot receive handler ──────────────────────────── */
/*
* ha_handle_snapshot_chunk: receive one snapshot transfer chunk on the standby.
*
* Each chunk's payload bytes are written (or appended) to snap.part in snap_dir.
* When chunk->is_last is non-zero:
* 1. Verify total bytes written == chunk->total_size.
* 2. Atomically rename snap.part → snap-{snapshot_lsn:016x}.bin.
* 3. Load the snapshot via persist_load_snapshot().
* 4. Set ha->applied_lsn = p->checkpoint_lsn (in-memory only).
*
* On mid-transfer reconnect (caller resets state), snap.part is discarded.
* Returns 0 on success, negative errno on error.
*
* Requirements: 4.2, 4.3, 4.4 (ha-repl-hardening spec)
* Boundary: Standby Dispatch (cluster.c, ha.c)
*/
int ha_handle_snapshot_chunk(ha_state_t *ha, persist_t *p,
const char *snap_dir,
snapshot_transfer_t *chunk,
const uint8_t *payload_bytes,
size_t payload_len);
/* ── HA Config Bootstrap & Term Durability (ha-config-bootstrap spec) ── */
/*