fix(cli): dispatch OS_DATABASE_DRIVER=memory to the mingo InMemoryDriver (#3276)

`os dev` / `os start` / `os serve` all advertise a `memory` database driver
(`--database-driver memory`, `OS_DATABASE_DRIVER=memory`, and a `memory://`
URL scheme), but serve.ts's driver dispatch had no `memory` branch. So
selecting it silently fell through to the dev SQLite `:memory:` default
(SQLite-in-memory — a different engine), or registered no driver at all in
production. Declared ≠ enforced.

Fix + refactor:
- Extract the driver kind-resolution and construction out of serve.ts's
  inline if/else chain into utils/storage-driver.ts, mirroring the existing
  utils/telemetry-datasource.ts / utils/plugin-detection.ts pattern, so the
  whole dispatch is unit-testable in isolation.
- Add the missing `memory` (aliases `mingo`, `in-memory`) branch that builds
  the mingo InMemoryDriver, honored in dev AND production.
- Recognize the advertised `memory://` / `mingo://` URL scheme in
  inferDriverTypeFromUrl (distinct from sqlite's `:memory:` pseudo-file,
  which stays SQLite's own in-memory mode).
- serve.ts telemetry-datasource provisioning behavior is preserved exactly
  (keyed on an explicit-sqlite primary path; never the memory driver).

Tests (storage-driver.test.ts) cover the full URL→kind mapping, explicit>URL
precedence, and every construction branch; the `memory` assertions go red
without the new branch (verified: dev→SqlDriver, prod→null).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: os-zhuang

packages/cli/src/commands/serve.ts

@@ -8,6 +8,7 @@ import chalk from 'chalk';
 import { bundleRequire } from 'bundle-require';
 import { loadConfig, BUNDLE_REQUIRE_EXTERNALS } from '../utils/config.js';
 import { isHostConfig, shouldBootWithLibrary } from '../utils/plugin-detection.js';
+import { resolveDriverType, createStorageDriver } from '../utils/storage-driver.js';
 import { readEnvWithDeprecation, resolveMultiOrgEnabled, resolveAllowDegradedTenancy, isMcpServerEnabled, resolveSearchPinyinEnabled, isModuleNotFoundError } from '@objectstack/types';
 import { PLATFORM_CAPABILITY_TOKENS, canonicalizePlatformCapability } from '@objectstack/spec/kernel';
 import { resolveObjectStackHome } from '@objectstack/runtime';
@@ -872,71 +873,48 @@ export default class Serve extends Command {
       //        postgres://, postgresql://       → postgres
       //        mysql://, mysql2://              → mysql
       //        libsql://, http(s):// + .turso.  → turso
-      //        file:, sqlite:, *.db, :memory:   → sqlite
-      //   3. Default: InMemoryDriver in dev mode
+      //        wasm-sqlite://, *.wasm.db        → sqlite-wasm
+      //        memory://, mingo://              → memory (mingo InMemoryDriver)
+      //        file:, sqlite:, *.db, :memory:   → sqlite (SQLite's own in-memory mode)
+      //   3. Default: dev SQLite (native → wasm → in-memory step-down); prod none
+      //
+      // Kind-resolution and construction live in utils/storage-driver.ts so the
+      // whole dispatch is unit-testable (storage-driver.test.ts). #3276: the
+      // `memory` kind now maps to the mingo InMemoryDriver instead of silently
+      // falling through to the dev SQLite `:memory:` default.
       const hasDriver = plugins.some((p: any) => p.name?.includes('driver') || p.constructor?.name?.includes('Driver'));
       if (!hasDriver && config.objects) {
-         const explicitDriver = (process.env.OS_DATABASE_DRIVER ?? '').toLowerCase().trim();
          const databaseUrl = process.env.OS_DATABASE_URL;
-
-         const inferDriverFromUrl = (url: string | undefined): string => {
-           if (!url) return '';
-           const u = url.trim();
-           if (/^mongodb(\+srv)?:\/\//i.test(u)) return 'mongodb';
-           if (/^postgres(ql)?:\/\//i.test(u)) return 'postgres';
-           if (/^mysql2?:\/\//i.test(u)) return 'mysql';
-           if (/^libsql:\/\//i.test(u)) return 'turso';
-           if (/^https?:\/\//i.test(u) && /\.turso\./i.test(u)) return 'turso';
-           if (/^wasm-sqlite:\/\//i.test(u) || /\.wasm\.db$/i.test(u)) return 'sqlite-wasm';
-           if (/^file:/i.test(u) || /^sqlite:/i.test(u) || u === ':memory:' || /\.(db|sqlite|sqlite3)$/i.test(u)) return 'sqlite';
-           return '';
-         };
-
-         const driverType = explicitDriver || inferDriverFromUrl(databaseUrl);
+         const driverType = resolveDriverType(process.env.OS_DATABASE_DRIVER, databaseUrl);
 
          try {
            const { DriverPlugin } = await import('@objectstack/runtime');
-
-           if (driverType === 'mongodb' || driverType === 'mongo') {
-             const { MongoDBDriver } = await import('@objectstack/driver-mongodb');
-             await kernel.use(new DriverPlugin(new MongoDBDriver({
-               url: databaseUrl ?? 'mongodb://localhost:27017/objectstack',
-             }) as any));
-             trackPlugin('MongoDBDriver');
-             resolvedDriverLabel = 'MongoDBDriver';
-             resolvedDatabaseUrl = databaseUrl ?? 'mongodb://localhost:27017/objectstack';
-           } else if (driverType === 'sqlite' || driverType === 'sql') {
-             const filePath = (databaseUrl ?? ':memory:').replace(/^file:/, '').replace(/^sqlite:/, '').replace(/^sql:\/\//, '');
-             // Probe-by-connect with a dev-only native → wasm → in-memory
-             // step-down (#2229). better-sqlite3 loads its native addon lazily
-             // (first query), so an ABI mismatch is invisible here and would
-             // otherwise surface much later as a runtime crash. resolveSqliteDriver
-             // forces the load and degrades gracefully in dev / fails loudly in prod.
-             const { resolveSqliteDriver } = await import('@objectstack/service-datasource');
-             const resolved = await resolveSqliteDriver({
-               filename: filePath,
-               dev: isDev,
-               // #2186: in dev, self-heal a persisted DB when a metadata change
-               // relaxes a constraint (loosen-only; never destructive / never in prod).
-               autoMigrate: isDev ? 'safe' : undefined,
-               warn: (m) => console.warn(chalk.yellow(m)),
-             });
-             await kernel.use(new DriverPlugin(resolved.driver));
-             trackPlugin(resolved.engine === 'memory' ? 'MemoryDriver' : resolved.engine === 'sqlite-wasm' ? 'SqliteWasmDriver' : 'SqlDriver');
-             resolvedDriverLabel = resolved.label;
-             resolvedDatabaseUrl = resolved.engine === 'memory' ? '(in-memory)' : (databaseUrl ?? ':memory:');
+           const resolution = await createStorageDriver(driverType, {
+             databaseUrl,
+             isDev,
+             warn: (m) => console.warn(chalk.yellow(m)),
+           });
+           if (resolution) {
+             await kernel.use(new DriverPlugin(resolution.driver as any));
+             trackPlugin(resolution.trackName);
+             resolvedDriverLabel = resolution.label;
+             resolvedDatabaseUrl = resolution.displayUrl;
 
              // ADR-0057 §3.6 (#2834 ②): provision the dedicated `telemetry`
              // datasource — a sibling SQLite file the engine routes every
              // telemetry/event/audit-classed object to, so platform-generated
              // growth can never again bloat the business DB. Dev default-on
              // for file-backed primaries; `OS_TELEMETRY_DB=0` opts out,
-             // `OS_TELEMETRY_DB=<path>` opts in anywhere (incl. serve).
-             if (resolved.engine !== 'memory') {
+             // `OS_TELEMETRY_DB=<path>` opts in anywhere (incl. serve). Gated on
+             // an explicit SQLite primary (`sqliteFilePath`, unset for the mingo
+             // memory driver AND the dev-default `:memory:` store) whose resolved
+             // engine is real SQLite — never mingo in-memory.
+             if (resolution.sqliteFilePath && resolution.engine !== 'memory') {
                const { resolveTelemetryDbPath } = await import('../utils/telemetry-datasource.js');
-               const telemetryPath = resolveTelemetryDbPath({ primaryPath: filePath, env: process.env, dev: isDev });
+               const telemetryPath = resolveTelemetryDbPath({ primaryPath: resolution.sqliteFilePath, env: process.env, dev: isDev });
                if (telemetryPath) {
                  try {
+                   const { resolveSqliteDriver } = await import('@objectstack/service-datasource');
                    const telemetry = await resolveSqliteDriver({
                      filename: telemetryPath,
                      dev: isDev,
@@ -957,59 +935,6 @@ export default class Serve extends Command {
                  }
                }
              }
-           } else if (driverType === 'sqlite-wasm' || driverType === 'wasm-sqlite' || driverType === 'wasm') {
-             const { SqliteWasmDriver } = await import('@objectstack/driver-sqlite-wasm');
-             const filePath = (databaseUrl ?? ':memory:').replace(/^file:/, '').replace(/^wasm-sqlite:\/\//, '').replace(/^sqlite:/, '');
-             await kernel.use(new DriverPlugin(new SqliteWasmDriver({
-               filename: filePath,
-               persist: 'on-disconnect',
-             }) as any));
-             trackPlugin('SqliteWasmDriver');
-             resolvedDriverLabel = 'SqliteWasmDriver';
-             resolvedDatabaseUrl = databaseUrl ?? ':memory:';
-           } else if (driverType === 'postgres' || driverType === 'postgresql' || driverType === 'pg') {
-             const { SqlDriver } = await import('@objectstack/driver-sql');
-             await kernel.use(new DriverPlugin(new SqlDriver({
-               client: 'pg',
-               connection: databaseUrl,
-               pool: { min: 0, max: 5 },
-               autoMigrate: isDev ? 'safe' : undefined, // #2186 dev loosen-only self-heal
-             }) as any));
-             trackPlugin('PostgresDriver');
-             resolvedDriverLabel = 'SqlDriver(pg)';
-             resolvedDatabaseUrl = databaseUrl;
-           } else if (driverType === 'mysql' || driverType === 'mysql2') {
-             const { SqlDriver } = await import('@objectstack/driver-sql');
-             await kernel.use(new DriverPlugin(new SqlDriver({
-               client: 'mysql2',
-               connection: databaseUrl,
-               pool: { min: 0, max: 5 },
-               autoMigrate: isDev ? 'safe' : undefined, // #2186 dev loosen-only self-heal
-             }) as any));
-             trackPlugin('MySQLDriver');
-             resolvedDriverLabel = 'SqlDriver(mysql2)';
-             resolvedDatabaseUrl = databaseUrl;
-           } else if (isDev) {
-             // Default in dev (no DB configured): prefer native SQLite for
-             // production-like SQL at native speed, with a graceful step-down to
-             // wasm SQLite (real SQL + on-disk persistence) then in-memory when the
-             // native better-sqlite3 binary is unavailable — not built, ABI mismatch
-             // after a Node upgrade (e.g. NODE_MODULE_VERSION change), or a blocked
-             // prebuild download. Shared with the explicit-file branch and the
-             // datasource factory via resolveSqliteDriver (#2229), which probes by
-             // actually opening a connection + running SELECT 1 (better-sqlite3 loads
-             // its native addon lazily at first query, not at construction).
-             const { resolveSqliteDriver } = await import('@objectstack/service-datasource');
-             const resolved = await resolveSqliteDriver({
-               filename: ':memory:',
-               dev: true,
-               autoMigrate: 'safe', // #2186 dev loosen-only self-heal
-               warn: (m) => console.warn(chalk.yellow(m)),
-             });
-             await kernel.use(new DriverPlugin(resolved.driver));
-             trackPlugin(resolved.engine === 'memory' ? 'MemoryDriver' : resolved.engine === 'sqlite-wasm' ? 'SqliteWasmDriver' : 'SqlDriver');
-             resolvedDriverLabel = resolved.label;
-             resolvedDatabaseUrl = resolved.engine === 'memory' ? '(in-memory)' : ':memory:';
            }
          } catch (e: any) {
            // silent

packages/cli/src/utils/storage-driver.test.ts

@@ -0,0 +1,133 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+import { describe, it, expect } from 'vitest';
+import { InMemoryDriver } from '@objectstack/driver-memory';
+import {
+  inferDriverTypeFromUrl,
+  resolveDriverType,
+  createStorageDriver,
+} from './storage-driver.js';
+
+describe('inferDriverTypeFromUrl', () => {
+  it('maps each recognized URL scheme to its canonical driver kind', () => {
+    expect(inferDriverTypeFromUrl('mongodb://localhost:27017/db')).toBe('mongodb');
+    expect(inferDriverTypeFromUrl('mongodb+srv://cluster/db')).toBe('mongodb');
+    expect(inferDriverTypeFromUrl('postgres://u:p@h/db')).toBe('postgres');
+    expect(inferDriverTypeFromUrl('postgresql://u:p@h/db')).toBe('postgres');
+    expect(inferDriverTypeFromUrl('mysql://u:p@h/db')).toBe('mysql');
+    expect(inferDriverTypeFromUrl('mysql2://u:p@h/db')).toBe('mysql');
+    expect(inferDriverTypeFromUrl('libsql://x.turso.io')).toBe('turso');
+    expect(inferDriverTypeFromUrl('https://x.turso.io')).toBe('turso');
+    expect(inferDriverTypeFromUrl('wasm-sqlite://data.db')).toBe('sqlite-wasm');
+    expect(inferDriverTypeFromUrl('./local.wasm.db')).toBe('sqlite-wasm');
+    expect(inferDriverTypeFromUrl('file:./app.db')).toBe('sqlite');
+    expect(inferDriverTypeFromUrl('sqlite:./app.db')).toBe('sqlite');
+    expect(inferDriverTypeFromUrl('./app.sqlite')).toBe('sqlite');
+  });
+
+  // #3276: the mingo in-memory engine has its own `memory://` URL scheme.
+  it('maps the memory:// (and mingo://) scheme to the mingo `memory` kind', () => {
+    expect(inferDriverTypeFromUrl('memory://')).toBe('memory');
+    expect(inferDriverTypeFromUrl('memory://ignored-host')).toBe('memory');
+    expect(inferDriverTypeFromUrl('mingo://')).toBe('memory');
+  });
+
+  // The sqlite `:memory:` PSEUDO-FILE is SQLite's own in-memory mode — NOT the
+  // mingo engine. It must stay `sqlite`, distinct from the `memory://` scheme.
+  it('keeps sqlite `:memory:` mapped to sqlite (distinct from memory://)', () => {
+    expect(inferDriverTypeFromUrl(':memory:')).toBe('sqlite');
+  });
+
+  it('returns "" for an absent or unrecognized URL', () => {
+    expect(inferDriverTypeFromUrl(undefined)).toBe('');
+    expect(inferDriverTypeFromUrl('')).toBe('');
+    expect(inferDriverTypeFromUrl('redis://localhost')).toBe('');
+  });
+});
+
+describe('resolveDriverType', () => {
+  it('lets an explicit driver win over URL inference (and normalizes case/space)', () => {
+    expect(resolveDriverType('memory', 'postgres://h/db')).toBe('memory');
+    expect(resolveDriverType('  MEMORY  ', undefined)).toBe('memory');
+    expect(resolveDriverType('Postgres', 'mongodb://h/db')).toBe('postgres');
+  });
+
+  it('falls back to URL inference when no explicit driver is set', () => {
+    expect(resolveDriverType(undefined, 'mongodb://h/db')).toBe('mongodb');
+    expect(resolveDriverType('', 'memory://')).toBe('memory');
+    expect(resolveDriverType('   ', undefined)).toBe('');
+  });
+});
+
+describe('createStorageDriver', () => {
+  // ── #3276: the regression this whole change exists to fix ──────────────────
+  // `memory` must construct the mingo InMemoryDriver — NOT fall through to the
+  // dev SQLite `:memory:` default (SQLite-in-memory, a different engine). Remove
+  // the `memory` branch in storage-driver.ts and this assertion goes red: in dev
+  // it resolves to a SqlDriver/SQLite engine, in prod it resolves to null.
+  it('constructs the mingo InMemoryDriver for `memory` in DEV', async () => {
+    const r = await createStorageDriver('memory', { isDev: true });
+    expect(r).not.toBeNull();
+    expect(r!.driver).toBeInstanceOf(InMemoryDriver);
+    expect(r!.engine).toBe('memory');
+    expect(r!.label).toBe('InMemoryDriver');
+    expect(r!.trackName).toBe('MemoryDriver');
+    expect(r!.displayUrl).toBe('(in-memory)');
+    // Never provisions a telemetry sibling.
+    expect(r!.sqliteFilePath).toBeUndefined();
+  });
+
+  // The explicit choice is honored in PRODUCTION too — declared === enforced.
+  it('constructs the mingo InMemoryDriver for `memory` in PROD', async () => {
+    const r = await createStorageDriver('memory', { isDev: false });
+    expect(r!.driver).toBeInstanceOf(InMemoryDriver);
+    expect(r!.engine).toBe('memory');
+  });
+
+  it('accepts the `mingo` and `in-memory` aliases', async () => {
+    expect((await createStorageDriver('mingo', { isDev: false }))!.driver).toBeInstanceOf(InMemoryDriver);
+    expect((await createStorageDriver('in-memory', { isDev: false }))!.driver).toBeInstanceOf(InMemoryDriver);
+  });
+
+  // ── Regression guards for the other branches (no connection is opened) ─────
+  it('constructs mongodb with the default URL when none is supplied', async () => {
+    const r = await createStorageDriver('mongodb', { isDev: false });
+    expect(r!.label).toBe('MongoDBDriver');
+    expect(r!.trackName).toBe('MongoDBDriver');
+    expect(r!.displayUrl).toBe('mongodb://localhost:27017/objectstack');
+  });
+
+  it('constructs postgres / mysql with their SqlDriver labels', async () => {
+    const pg = await createStorageDriver('postgres', { databaseUrl: 'postgres://u:p@h/db', isDev: false });
+    expect(pg!.label).toBe('SqlDriver(pg)');
+    expect(pg!.trackName).toBe('PostgresDriver');
+    const my = await createStorageDriver('mysql', { databaseUrl: 'mysql://u:p@h/db', isDev: false });
+    expect(my!.label).toBe('SqlDriver(mysql2)');
+    expect(my!.trackName).toBe('MySQLDriver');
+  });
+
+  it('constructs sqlite-wasm without connecting', async () => {
+    const r = await createStorageDriver('sqlite-wasm', { databaseUrl: 'file:./x.db', isDev: false });
+    expect(r!.label).toBe('SqliteWasmDriver');
+    expect(r!.trackName).toBe('SqliteWasmDriver');
+  });
+
+  // In PROD, `resolveSqliteDriver` returns the native driver UNPROBED (no
+  // connect), so this is fast and native-addon-free. It also documents that an
+  // explicit sqlite primary DOES surface `sqliteFilePath` for the telemetry
+  // sibling — the field the `memory` driver deliberately leaves unset.
+  it('constructs explicit sqlite and surfaces sqliteFilePath for telemetry', async () => {
+    const r = await createStorageDriver('sqlite', { databaseUrl: ':memory:', isDev: false });
+    expect(r!.engine).toBe('better-sqlite3');
+    expect(r!.label).toBe('SqlDriver(sqlite)');
+    expect(r!.trackName).toBe('SqlDriver');
+    expect(r!.sqliteFilePath).toBe(':memory:');
+  });
+
+  // Production with no driver configured registers nothing (loud downstream
+  // failure), rather than silently inventing an engine.
+  it('returns null for an unknown/absent driver in PROD', async () => {
+    expect(await createStorageDriver('', { isDev: false })).toBeNull();
+    expect(await createStorageDriver('nonsense', { isDev: false })).toBeNull();
+  });
+});