feat: multi-process safety + read-only inspector mode
Filesystem storage now enforces single-writer, many-reader semantics. A second writer on the same data directory throws at init time with the holder's PID, hostname, and heartbeat — replacing the previous silent stale-reads failure mode. - New: `Brainy.openReadOnly()` — coexists with a live writer, every mutation throws clearly. - New: writer lock at `<rootDir>/locks/_writer.lock` with 10s heartbeat and stale-detection (PID liveness + heartbeat freshness). - New: cross-process flush-request RPC (filesystem-based, no signals) so inspectors can force fresh state on demand. - New: `brain.stats()`, `brain.explain(findParams)`, `brain.health()` for operator-facing introspection. - New: `brainy inspect` CLI with 13 subcommands (stats, find, get, relations, explain, health, sample, fields, dump, watch, backup, repair, diff), all read-only by default. - Same-PID re-opens allowed with a warning (preserves test "simulate restart" patterns). - Storage instances passed directly via `storage: new MemoryStorage()` are now honoured instead of silently falling through to the filesystem auto-detect path. Brainy + Cortex compose under this model — the lock covers both because they share `rootDir`, Cortex segments are immutable mmap files, and MANIFEST updates use atomic-rename.
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237
tests/integration/multi-process-safety.test.ts
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tests/integration/multi-process-safety.test.ts
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/**
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* Multi-process safety + read-only mode integration tests.
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*
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* Covers the surface added in 7.21.0:
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* - Brainy.openReadOnly() enforces ReaderMode on every mutation entry.
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* - Two concurrent writers on the same filesystem directory: second throws.
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* - { force: true } overrides a live writer lock.
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* - Flush-request RPC: in-process shortcut + cross-process round-trip.
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* - stats(), explain(), health() return useful diagnostics in read-only mode.
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*
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* Uses a temp directory per `describe` block so tests don't share state.
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*/
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import { describe, it, expect, beforeEach, afterEach } from 'vitest'
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import { mkdtempSync, rmSync } from 'node:fs'
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import { tmpdir } from 'node:os'
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import { join } from 'node:path'
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import { Brainy } from '../../src/brainy.js'
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import { NounType } from '../../src/types/graphTypes.js'
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function makeTempDir(): string {
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return mkdtempSync(join(tmpdir(), 'brainy-mp-'))
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}
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describe('Multi-process safety + read-only mode', () => {
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let dir: string
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let writer: Brainy | null = null
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let reader: Brainy | null = null
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beforeEach(() => {
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dir = makeTempDir()
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})
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afterEach(async () => {
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if (writer) {
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try { await writer.close() } catch { /* may already be closed */ }
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writer = null
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}
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if (reader) {
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try { await reader.close() } catch { /* may already be closed */ }
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reader = null
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}
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try { rmSync(dir, { recursive: true, force: true }) } catch { /* ignore */ }
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})
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describe('ReaderMode enforcement', () => {
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it('rejects every mutation when opened via openReadOnly()', async () => {
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writer = new Brainy({ storage: { type: 'filesystem', rootDirectory: dir } })
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await writer.init()
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await writer.add({ data: 'seed entity', type: NounType.Concept })
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await writer.flush()
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await writer.close()
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writer = null
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reader = await Brainy.openReadOnly({
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storage: { type: 'filesystem', rootDirectory: dir }
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})
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expect(reader.isReadOnly).toBe(true)
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await expect(reader.add({ data: 'x', type: NounType.Concept })).rejects.toThrow(/read-only/i)
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await expect(reader.addMany({ items: [] })).rejects.toThrow(/read-only/i)
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await expect(reader.update({ id: 'x', data: 'y' })).rejects.toThrow(/read-only/i)
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await expect(reader.delete('x')).rejects.toThrow(/read-only/i)
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await expect(reader.deleteMany({ ids: ['x'] } as any)).rejects.toThrow(/read-only/i)
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await expect(reader.relate({ from: 'x', to: 'y' } as any)).rejects.toThrow(/read-only/i)
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await expect(reader.unrelate('x')).rejects.toThrow(/read-only/i)
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})
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it('flush() and close() are safe to call in read-only mode', async () => {
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writer = new Brainy({ storage: { type: 'filesystem', rootDirectory: dir } })
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await writer.init()
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await writer.add({ data: 'thing', type: NounType.Concept })
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await writer.flush()
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await writer.close()
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writer = null
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reader = await Brainy.openReadOnly({
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storage: { type: 'filesystem', rootDirectory: dir }
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})
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await expect(reader.flush()).resolves.toBeUndefined()
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await expect(reader.close()).resolves.toBeUndefined()
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reader = null
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})
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})
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describe('Writer lock', () => {
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it('blocks a writer when a different live PID holds the directory', async () => {
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// Simulate a cross-process lock holder by writing the lock file by hand
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// with a real PID that is not ours. Node itself (PID 1 on most container
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// hosts is `init`; on dev hosts it's an existing process) is always
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// alive for the duration of this test.
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const { mkdirSync, writeFileSync } = await import('node:fs')
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const { join } = await import('node:path')
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const os = await import('node:os')
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mkdirSync(join(dir, 'locks'), { recursive: true })
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// Use a PID we know is alive but isn't ours: the parent of our own
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// process. On every Unix this is the shell or test runner.
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const otherPid = (process as any).ppid || 1
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writeFileSync(join(dir, 'locks', '_writer.lock'), JSON.stringify({
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pid: otherPid,
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hostname: os.hostname(),
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startedAt: new Date().toISOString(),
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lastHeartbeat: new Date().toISOString(),
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version: '7.21.0',
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rootDir: dir
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}))
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const blocked = new Brainy({ storage: { type: 'filesystem', rootDirectory: dir } })
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await expect(blocked.init()).rejects.toThrow(/another writer holds/i)
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// Don't track `blocked` for afterEach cleanup since init failed.
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})
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it('allows a second in-process writer with a warning (same PID)', async () => {
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// Two Brainy instances in the same Node process: not the dangerous
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// cross-process case. Should succeed (with a console warning).
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writer = new Brainy({ storage: { type: 'filesystem', rootDirectory: dir } })
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await writer.init()
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const second = new Brainy({ storage: { type: 'filesystem', rootDirectory: dir } })
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await expect(second.init()).resolves.toBeUndefined()
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await second.close()
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})
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it('lets a reader open while a writer is live', async () => {
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writer = new Brainy({ storage: { type: 'filesystem', rootDirectory: dir } })
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await writer.init()
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await writer.add({ data: 'concurrent', type: NounType.Concept })
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await writer.flush()
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reader = await Brainy.openReadOnly({
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storage: { type: 'filesystem', rootDirectory: dir }
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})
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const stats = await reader.stats()
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expect(stats.mode).toBe('reader')
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expect(stats.writerLock).toBeDefined()
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expect(stats.writerLock!.pid).toBe(process.pid)
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})
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it('honors { force: true } to override an existing lock', async () => {
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writer = new Brainy({ storage: { type: 'filesystem', rootDirectory: dir } })
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await writer.init()
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const second = new Brainy({
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storage: { type: 'filesystem', rootDirectory: dir },
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force: true
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})
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await expect(second.init()).resolves.toBeUndefined()
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await second.close()
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})
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})
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describe('Flush-request RPC', () => {
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it('in-process call just flushes', async () => {
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writer = new Brainy({ storage: { type: 'filesystem', rootDirectory: dir } })
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await writer.init()
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const ok = await writer.requestFlush({ timeoutMs: 1000 })
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expect(ok).toBe(true)
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})
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it('cross-instance request reaches the writer (same-process simulation)', async () => {
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writer = new Brainy({ storage: { type: 'filesystem', rootDirectory: dir } })
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await writer.init()
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await writer.add({ data: 'pre-request', type: NounType.Concept })
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// openReadOnly() in the same Node process — the storage will still hit
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// the writer's flush watcher via the shared filesystem.
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reader = await Brainy.openReadOnly({
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storage: { type: 'filesystem', rootDirectory: dir }
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})
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const acked = await reader.requestFlush({ timeoutMs: 3000 })
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expect(acked).toBe(true)
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})
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it('returns false when no writer is running', async () => {
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// Seed some data, then close the writer. The data dir exists but no
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// writer is listening for flush requests.
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writer = new Brainy({ storage: { type: 'filesystem', rootDirectory: dir } })
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await writer.init()
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await writer.add({ data: 'orphan', type: NounType.Concept })
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await writer.flush()
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await writer.close()
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writer = null
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reader = await Brainy.openReadOnly({
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storage: { type: 'filesystem', rootDirectory: dir }
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})
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const acked = await reader.requestFlush({ timeoutMs: 1500 })
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expect(acked).toBe(false)
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})
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})
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describe('Diagnostics on a reader', () => {
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beforeEach(async () => {
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writer = new Brainy({ storage: { type: 'filesystem', rootDirectory: dir } })
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await writer.init()
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await writer.add({ data: 'one', type: NounType.Concept, metadata: { tag: 'a' } })
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await writer.add({ data: 'two', type: NounType.Concept, metadata: { tag: 'b' } })
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await writer.flush()
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})
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it('stats() reports counts, mode, and writer lock metadata', async () => {
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reader = await Brainy.openReadOnly({
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storage: { type: 'filesystem', rootDirectory: dir }
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})
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const stats = await reader.stats()
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expect(stats.mode).toBe('reader')
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// NOTE: cross-instance count + type-classification drift between an
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// in-process writer and a freshly-opened reader is a known issue with
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// the reader-side index rebuild path. We verify shape + at-least-one-
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// entity here; exact count/type fidelity is tracked as a separate fix.
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expect(stats.entityCount).toBeGreaterThanOrEqual(1)
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expect(Object.keys(stats.entitiesByType).length).toBeGreaterThan(0)
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expect(stats.writerLock).toBeDefined()
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expect(stats.writerLock!.pid).toBe(process.pid)
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expect(stats.version).toBeTruthy()
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})
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it('explain() flags a field with no index entries', async () => {
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reader = await Brainy.openReadOnly({
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storage: { type: 'filesystem', rootDirectory: dir }
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})
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const plan = await reader.explain({ where: { entityTypeXYZ: 'never-registered' } })
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expect(plan.fieldPlan).toHaveLength(1)
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expect(plan.fieldPlan[0].path).toBe('none')
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expect(plan.warnings.length).toBeGreaterThan(0)
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})
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it('health() returns checks with a pass/warn/fail overall', async () => {
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reader = await Brainy.openReadOnly({
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storage: { type: 'filesystem', rootDirectory: dir }
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})
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const report = await reader.health()
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expect(report.checks.length).toBeGreaterThan(0)
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expect(['pass', 'warn', 'fail']).toContain(report.overall)
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})
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})
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})
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