fix(credentials-local): one operation chain, read-modify-write under the shared writer lock, and a quote-aware line editor
Review round three, credentials half. dsh-atomic-write grows the cross-process writer-lock primitive (withFileLock: wx sentinel, bounded backoff, stale takeover via onStaleBreak, deadline failure) plus a dirMode option, and settings-local migrates its private copy to it; both providers now create harness-home directories 0700. credentials-local reuses the reviewed settings-local shape: watcher reloads and line edits share one settled operation chain; every write re-reads the document under the lock and publishes unobserved external entries before editing, so an edit inside the debounce window (or another process's write) can never be overwritten; the watcher's ready signal queues one reconcile closing the startup gap. The line editor is now physical-line aware: continuation lines of a quoted multi-line value are never mistaken for assignments, untouched lines keep their exact bytes (CRLF included), an edited line keeps its own terminator, and appends use the document's dominant ending. A multi-line entry reports writable: false, matching what set() would do. The Credentials base class owns a contained notifyUpdated fan-out: providers publish only after the commit, every listener runs, sync throws and async rejections are logged without failing the committed write, and INVARIANT-coded failures rethrow after the fan-out.
This commit is contained in:
Yichen Jiang
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// Third-review behaviors: read-modify-write under the writer lock (external
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// edits survive an API write), the contained credentials/updated fan-out (a
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// broken observer never fails a committed write), and the physical-line
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// editor's multi-line and CRLF discipline.
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import { afterEach, describe, expect, it, vi } from 'vitest'
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import { Context } from 'cordis'
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import { mkdtemp, readFile, rm, stat, utimes, writeFile } from 'node:fs/promises'
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import { tmpdir } from 'node:os'
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import { join } from 'node:path'
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import { credentialRef } from '@deepseek-ai/dsh-credentials'
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import { CredentialsLocal } from '../src/index.ts'
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const ALPHA = credentialRef('DSH_REVIEW_ALPHA')
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const BETA = credentialRef('DSH_REVIEW_BETA')
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const INNER = credentialRef('DSH_REVIEW_INNER')
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const cleanups: Array<() => Promise<void>> = []
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afterEach(async () => {
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while (cleanups.length > 0) await cleanups.pop()!()
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})
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async function tempDir(): Promise<string> {
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const dir = await mkdtemp(join(tmpdir(), 'dsh-cred-review-'))
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cleanups.push(() => rm(dir, { recursive: true, force: true }))
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return dir
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}
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async function boot(config: ConstructorParameters<typeof CredentialsLocal>[1]): Promise<Context> {
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const ctx = new Context()
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const fiber = ctx.plugin(CredentialsLocal, config)
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cleanups.push(async () => { await fiber.dispose() })
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await fiber
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return ctx
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}
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describe('read-modify-write', () => {
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it('folds an unobserved external edit into a write instead of overwriting it', async () => {
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const dir = await tempDir()
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const path = join(dir, '.env')
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const ctx = await boot({ path, watch: false })
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const seen: string[] = []
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ctx.on('credentials/updated', (ref) => { seen.push(ref) })
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await ctx.credentials.set(ALPHA, 'one')
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// The external edit has landed on disk but no watcher reported it (watch
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// is off — the same blind spot as a debounce window or a missed event).
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await writeFile(path, `${ALPHA}=one\n${BETA}=external\n`)
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await ctx.credentials.set(ALPHA, 'two')
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const text = await readFile(path, 'utf8')
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expect(text).toContain(`${BETA}=external`)
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expect(text).toContain(`${ALPHA}=two`)
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// The fold published the unobserved entry before the write's own commit.
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expect(seen).toEqual([ALPHA, BETA, ALPHA])
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expect(await ctx.credentials.resolve(BETA)).toEqual({ value: 'external', source: 'file' })
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})
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it('keeps both refs when two providers write the same document concurrently', async () => {
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const dir = await tempDir()
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const path = join(dir, '.env')
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const first = await boot({ path, watch: false })
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const second = await boot({ path, watch: false })
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await Promise.all([
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(async () => { for (const value of ['1', '2', '3'] as const) await first.credentials.set(ALPHA, value) })(),
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(async () => { for (const value of ['1', '2', '3'] as const) await second.credentials.set(BETA, value) })(),
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])
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const third = await boot({ path, watch: false })
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expect(await third.credentials.resolve(ALPHA)).toEqual({ value: '3', source: 'file' })
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expect(await third.credentials.resolve(BETA)).toEqual({ value: '3', source: 'file' })
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})
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it('breaks a stale writer lock with a warning and writes through', async () => {
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const dir = await tempDir()
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const path = join(dir, '.env')
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const ctx = await boot({ path, watch: false })
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await writeFile(`${path}.lock`, 'crashed-holder\n')
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const past = (Date.now() - 60_000) / 1000
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await utimes(`${path}.lock`, past, past)
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await ctx.credentials.set(ALPHA, 'nine')
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expect(await readFile(path, 'utf8')).toContain(`${ALPHA}=nine`)
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})
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it('creates the credentials directory owner-only', async () => {
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const dir = await tempDir()
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const home = join(dir, 'home')
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const ctx = await boot({ path: join(home, '.env'), watch: false })
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await ctx.credentials.set(ALPHA, 'one')
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expect((await stat(home)).mode & 0o777).toBe(0o700)
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})
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})
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describe('contained update fan-out', () => {
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it('does not fail a committed set when a listener throws, and later listeners still run', async () => {
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const dir = await tempDir()
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const ctx = await boot({ path: join(dir, '.env'), watch: false })
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ctx.on('credentials/updated', () => {
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throw new Error('observer boom')
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})
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const second = vi.fn()
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ctx.on('credentials/updated', second)
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await expect(ctx.credentials.set(ALPHA, 'one')).resolves.toBeUndefined()
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expect(second).toHaveBeenCalledWith(ALPHA)
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expect(await ctx.credentials.resolve(ALPHA)).toEqual({ value: 'one', source: 'file' })
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})
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it('contains an async listener rejection', async () => {
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const dir = await tempDir()
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const ctx = await boot({ path: join(dir, '.env'), watch: false })
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// An unknown-returning function keeps the typed surface legal while the
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// runtime value is still the rejected promise the containment must handle.
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const boom = (): unknown => Promise.reject(new Error('async observer boom'))
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ctx.on('credentials/updated', boom)
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await expect(ctx.credentials.set(ALPHA, 'one')).resolves.toBeUndefined()
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await new Promise(resolve => setTimeout(resolve, 10))
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})
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it('rethrows an invariant-coded failure after the commit and the remaining listeners', async () => {
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const dir = await tempDir()
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const path = join(dir, '.env')
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const ctx = await boot({ path, watch: false })
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ctx.on('credentials/updated', () => {
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throw Object.assign(new Error('forged relation'), { code: 'INVARIANT' })
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})
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const second = vi.fn()
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ctx.on('credentials/updated', second)
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await expect(ctx.credentials.set(ALPHA, 'one')).rejects.toThrow(/forged relation/)
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// Harness-fatal by design — but the write itself committed first.
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expect(second).toHaveBeenCalledWith(ALPHA)
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expect(await readFile(path, 'utf8')).toContain(`${ALPHA}=one`)
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expect(await ctx.credentials.resolve(ALPHA)).toEqual({ value: 'one', source: 'file' })
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})
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})
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describe('physical-line editor', () => {
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it('never mistakes a quoted multi-line continuation for an assignment', async () => {
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const dir = await tempDir()
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const path = join(dir, '.env')
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const wrapped = `DSH_REVIEW_WRAPPED="line1\n${INNER}=looks-like-one\nline3"\n${ALPHA}=a\n`
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await writeFile(path, wrapped)
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const ctx = await boot({ path, watch: false })
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await ctx.credentials.set(ALPHA, 'b')
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// The wrapped value survives byte-for-byte; only ALPHA's line changed.
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const afterAlpha = await readFile(path, 'utf8')
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expect(afterAlpha).toBe(`DSH_REVIEW_WRAPPED="line1\n${INNER}=looks-like-one\nline3"\n${ALPHA}=b\n`)
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// Setting the inner-looking ref appends a real assignment; the
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// continuation line inside the quoted value stays untouched.
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await ctx.credentials.set(INNER, 'real')
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const afterInner = await readFile(path, 'utf8')
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expect(afterInner).toBe(`DSH_REVIEW_WRAPPED="line1\n${INNER}=looks-like-one\nline3"\n${ALPHA}=b\n${INNER}=real\n`)
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expect(await ctx.credentials.resolve(INNER)).toEqual({ value: 'real', source: 'file' })
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})
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it('preserves CRLF line endings on untouched and edited lines', async () => {
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const dir = await tempDir()
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const path = join(dir, '.env')
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await writeFile(path, `# note\r\n${ALPHA}=a\r\n${BETA}=keep\r\n`)
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const ctx = await boot({ path, watch: false })
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await ctx.credentials.set(ALPHA, 'b')
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expect(await readFile(path, 'utf8')).toBe(`# note\r\n${ALPHA}=b\r\n${BETA}=keep\r\n`)
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await ctx.credentials.set(INNER, 'new')
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expect(await readFile(path, 'utf8')).toBe(`# note\r\n${ALPHA}=b\r\n${BETA}=keep\r\n${INNER}=new\r\n`)
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})
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it('terminates a final unterminated line before appending', async () => {
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const dir = await tempDir()
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const path = join(dir, '.env')
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await writeFile(path, `${ALPHA}=a`)
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const ctx = await boot({ path, watch: false })
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await ctx.credentials.set(BETA, 'b')
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expect(await readFile(path, 'utf8')).toBe(`${ALPHA}=a\n${BETA}=b\n`)
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})
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it('rewrites a final unterminated assignment in the dominant ending style', async () => {
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const dir = await tempDir()
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const path = join(dir, '.env')
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await writeFile(path, `${ALPHA}=a`)
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const ctx = await boot({ path, watch: false })
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await ctx.credentials.set(ALPHA, 'b')
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expect(await readFile(path, 'utf8')).toBe(`${ALPHA}=b\n`)
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})
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it('tracks a single-quoted multi-line value through its continuation', async () => {
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const dir = await tempDir()
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const path = join(dir, '.env')
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await writeFile(path, `DSH_REVIEW_SQ='line1\n${INNER}=shadow\nline3'\n`)
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const ctx = await boot({ path, watch: false })
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await ctx.credentials.set(ALPHA, 'x')
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expect(await readFile(path, 'utf8'))
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.toBe(`DSH_REVIEW_SQ='line1\n${INNER}=shadow\nline3'\n${ALPHA}=x\n`)
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})
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it('reports a multi-line entry as unwritable and refuses to edit it', async () => {
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const dir = await tempDir()
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const path = join(dir, '.env')
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await writeFile(path, `${ALPHA}="line1\nline2"\n`)
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const ctx = await boot({ path, watch: false })
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expect(await ctx.credentials.describe(ALPHA)).toEqual({ configured: true, source: 'file', writable: false })
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await expect(ctx.credentials.set(ALPHA, 'flat')).rejects.toThrow(/multi-line entry/)
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await expect(ctx.credentials.unset(ALPHA)).rejects.toThrow(/multi-line entry/)
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// Resolution still serves the multi-line value.
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expect(await ctx.credentials.resolve(ALPHA)).toEqual({ value: 'line1\nline2', source: 'file' })
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})
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})
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