fix(driver-sql): pre-create autonumber sequences table to avoid batch/tx deadlock#2537
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📓 Docs Drift CheckThis PR changes 1 package(s): 8 hand-written doc(s) reference the affected code and may need an implementation-accuracy re-verification:
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…/tx deadlock Lazy creation of _objectstack_sequences on the first autonumber INSERT asked the pool for a second connection. Inside a /api/v1/batch transaction on SQLite (pool max=1) the only connection is already held, so the acquire blocked until 'Knex: Timeout acquiring a connection'. Postgres/MySQL hit the same pool exhaustion under concurrent cold first-writes. - initObjects now pre-creates the counter table outside any data transaction. - The lazy fallback runs its DDL on the caller's transaction on SQLite only (never on MySQL, where DDL would implicitly commit the caller's transaction). - Regression test reproduces the deadlock (fails on old code, passes now).
Harden the lazy ensureSequencesTable fallback: when the table is created on the caller's transaction (SQLite in-tx path), the create is commit-conditional — a rollback would drop it. Cache sequencesTableReady only when the DDL ran on a durable pooled connection (this.knex); on the in-tx path leave the flag unset so the next write cheaply re-verifies via hasTable instead of trusting a stale process-level flag. initObjects still sets it durably up front, so the hot path is unchanged.
…ection deadlock Turns the latent 'bare this.knex query while a transaction holds SQLite's only pooled connection' hang (surfacing as 'Knex: Timeout acquiring a connection') into an immediate, actionable error at the call site. - Track open transactions (beginTransaction++/commit+rollback--) with a WeakSet so the decrement is idempotent on double close. - assertBareKnexSafe(op): throws only in the danger combination (non-production + SQLite + an open transaction). No-op in production and on non-SQLite dialects — zero hot-path cost. - Wire it into ensureSequencesTable's bare-knex branch, catching the 'opened a tx but forgot to thread it through as parentTrx' regression. Adds sql-driver-sqlite-tx-guard.test.ts (11 cases: tx bookkeeping, guard fires on the deadlock shape, guard stays quiet on legitimate paths, and the production/non-sqlite/no-tx branch matrix).
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问题
SQLite 下
POST /api/v1/batch创建含auto_number字段的对象会死锁(连接池 acquire 超时):根因
_objectstack_sequences计数表是在第一次 autonumber 写时懒创建的,走的是裸this.knex.schema.*—— 向连接池申请第二条连接。而/batch端点把整批操作包在一个ql.transaction(...)里(rest-server.ts:5637),SQLite 连接池上限硬编码为 1(knexClient_SQLite3.poolDefaults → { min:1, max:1 },better-sqlite3继承),那唯一的连接已被外层事务独占 → 第二条永远拿不到 → 超时。受
sequencesTableReady进程级一次性 flag 守护,所以只有进程启动后冷态的第一次 autonumber 写(若恰好走 batch/事务)才 100% 触发 —— 与报告的「已 seed 库重启后首个 batch 动作中招」完全吻合。不只 SQLite:Postgres/MySQL 池默认
max=10,单请求不死锁,但冷 flag 窗口内 ≥pool.max 个并发首写会同样池耗尽死锁。修复
initObjects在建表阶段(事务外、独立连接)预建计数表,数据写路径永不触发 DDL。验证
sql-driver-autonumber-tx.test.ts:预建断言 + batch 事务首写 + 冷态事务内首写(全部withTimeout抓死锁)。driver-sql套件 237 passed (27 files);DTS typecheck 通过。