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import { mkdtemp, readFile, readdir, rm, utimes, writeFile } from 'node:fs/promises'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
import { z } from 'zod'
import * as durable from '../durable-file-write'
import {
marker,
NOW,
SESSION
} from '../native-chat/agent-session-wire/structured-agent-session-restart-resume-test-harness'
import {
AgentSessionRecoveryCapsule,
AGENT_SESSION_RECOVERY_CAPSULE_FILE
} from './agent-session-recovery-capsule'
import type { AgentSessionResumeFailureInput } from './agent-session-recovery-capsule-entries'
let directory: string
let filePath: string
let capsule: AgentSessionRecoveryCapsule
beforeEach(async () => {
directory = await mkdtemp(join(tmpdir(), 'orca-recovery-capsule-'))
filePath = join(directory, AGENT_SESSION_RECOVERY_CAPSULE_FILE)
capsule = new AgentSessionRecoveryCapsule(directory)
})
afterEach(async () => {
vi.restoreAllMocks()
await rm(directory, { recursive: true, force: true })
})
function failure(
overrides: Partial<AgentSessionResumeFailureInput> = {}
): AgentSessionResumeFailureInput {
return {
sessionId: SESSION,
failedAt: NOW,
outcome: 'refused',
reason: 'agent_session_restart_work_superseded',
latestPrompt: '',
latestUserItemId: 'user-after-failure',
...overrides
}
}
async function fileFailure(overrides: Partial<AgentSessionResumeFailureInput> = {}) {
await capsule.beginResume([SESSION], 'operation-a', NOW)
await capsule.failResume('operation-a', [failure(overrides)], NOW)
}
function failPublish() {
return vi.spyOn(durable, 'renameDurable').mockRejectedValueOnce(new Error('publish unavailable'))
}
describe('durable restart offers', () => {
it('lists without spending or rewriting the durable records', async () => {
const markers = [marker(), marker({ sessionId: 'second' })]
await capsule.record(markers, NOW)
const before = await readFile(filePath)
expect(await capsule.list(NOW)).toEqual(markers)
expect(await capsule.list(NOW)).toEqual(markers)
expect(await readFile(filePath)).toEqual(before)
})
it('merges fresh teardown markers with existing offers by session', async () => {
const replacement = marker({ teardownId: 'teardown-new', recordedAt: NOW + 1 })
await capsule.record([marker(), marker({ sessionId: 'second' })], NOW)
await capsule.record([replacement], NOW + 1)
expect(await capsule.list(NOW + 1)).toEqual([replacement, marker({ sessionId: 'second' })])
})
it('does not let a late older teardown replace a newer offer', async () => {
const older = marker({ recordedAt: NOW })
const newer = marker({ recordedAt: NOW + 1, teardownId: 'teardown-new' })
await capsule.record([newer], NOW + 1)
await capsule.record([older], NOW + 1)
expect(await capsule.list(NOW + 1)).toEqual([newer])
})
it('reserves only one copy of a selected session across competing owners', async () => {
await capsule.record([marker(), marker({ sessionId: 'second' })], NOW)
const other = new AgentSessionRecoveryCapsule(directory)
const results = await Promise.allSettled([
capsule.beginResume([SESSION], 'operation-a', NOW),
other.beginResume([SESSION], 'operation-b', NOW)
])
const selected = results.flatMap((result) =>
result.status === 'fulfilled' ? result.value : []
)
// File locking serializes admission; the second action sees the first reservation.
expect(selected).toHaveLength(1)
expect(await capsule.list(NOW)).toEqual([marker({ sessionId: 'second' })])
})
it('deletes only completed sessions and leaves unrelated offers', async () => {
await capsule.record([marker(), marker({ sessionId: 'second' })], NOW)
const reserved = await capsule.beginResume([SESSION], 'operation-a', NOW)
expect(reserved).toEqual([marker()])
await capsule.completeResume('operation-a', [SESSION], NOW)
expect(await capsule.list(NOW)).toEqual([marker({ sessionId: 'second' })])
})
it('files an acted-on session whose agent did not carry on as a durable failure', async () => {
await capsule.record([marker(), marker({ sessionId: 'second' })], NOW)
await capsule.beginResume([SESSION], 'operation-a', NOW)
await capsule.failResume(
'operation-a',
[
failure({
failedAt: NOW + 5,
reason: 'agent_session_restart_work_superseded',
latestPrompt: 'fix the auth bug'
})
],
NOW + 5
)
expect(await capsule.list(NOW + 5)).toEqual([marker({ sessionId: 'second' })])
expect(await capsule.listFailed(NOW + 5)).toEqual([
{
marker: marker(),
failedAt: NOW + 5,
outcome: 'refused',
reason: 'agent_session_restart_work_superseded',
latestPrompt: 'fix the auth bug',
latestUserItemId: 'user-after-failure'
}
])
await capsule.rollbackResume('operation-a', NOW + 5)
expect(await capsule.list(NOW + 5)).toEqual([marker({ sessionId: 'second' })])
expect(await capsule.listFailed(NOW + 5)).toHaveLength(1)
})
it('only files failures for the operation that owns the reservation', async () => {
await capsule.record([marker()], NOW)
await capsule.beginResume([SESSION], 'operation-a', NOW)
await capsule.failResume('operation-b', [failure()], NOW)
expect(await capsule.listFailed(NOW)).toEqual([])
await capsule.rollbackResume('operation-a', NOW)
expect(await capsule.list(NOW)).toEqual([marker()])
})
it('retries a failure only when the action names it, and a success removes it', async () => {
await capsule.record([marker(), marker({ sessionId: 'second' })], NOW)
await fileFailure()
expect(await capsule.beginResume(undefined, 'operation-b', NOW)).toEqual([
marker({ sessionId: 'second' })
])
await capsule.rollbackResume('operation-b', NOW)
// Explicit selection retries failures without removing their guidance until settlement.
expect(await capsule.beginResume([SESSION], 'operation-c', NOW)).toEqual([marker()])
expect(await capsule.listFailed(NOW)).toHaveLength(1)
await capsule.completeResume('operation-c', [SESSION], NOW)
expect(await capsule.listFailed(NOW)).toEqual([])
expect(await capsule.list(NOW)).toEqual([marker({ sessionId: 'second' })])
})
it('keeps a retried failure a failure when the retry rolls back or its lease lapses', async () => {
await capsule.record([marker()], NOW)
await fileFailure()
await capsule.beginResume([SESSION], 'operation-b', NOW)
await capsule.rollbackResume('operation-b', NOW)
expect(await capsule.list(NOW)).toEqual([])
expect(await capsule.listFailed(NOW)).toHaveLength(1)
expect(await capsule.beginResume(undefined, 'operation-c', NOW)).toEqual([])
await capsule.beginResume([SESSION], 'operation-d', NOW)
const later = NOW + 10 * 60 * 1000 + 1
expect(await capsule.list(later)).toEqual([])
expect(await capsule.beginResume(undefined, 'operation-e', later)).toEqual([])
expect(await capsule.listFailed(later)).toHaveLength(1)
})
it('refiles a failed retry with its new reason', async () => {
await capsule.record([marker()], NOW)
await fileFailure()
await capsule.beginResume([SESSION], 'operation-b', NOW + 1)
await capsule.failResume(
'operation-b',
[failure({ failedAt: NOW + 1, reason: 'agent_session_conflict' })],
NOW + 1
)
expect(await capsule.listFailed(NOW + 1)).toMatchObject([
{ failedAt: NOW + 1, reason: 'agent_session_conflict' }
])
})
it('lets a newer teardown of the same chat supersede its recorded failure', async () => {
await capsule.record([marker()], NOW)
await fileFailure({ outcome: 'unconfirmed', reason: 'pending' })
await capsule.record([marker()], NOW)
expect(await capsule.list(NOW)).toEqual([])
expect(await capsule.listFailed(NOW)).toHaveLength(1)
const newer = marker({ recordedAt: NOW + 1, teardownId: 'teardown-new' })
await capsule.record([newer], NOW + 1)
expect(await capsule.list(NOW + 1)).toEqual([newer])
expect(await capsule.listFailed(NOW + 1)).toEqual([])
})
it('forgets a superseded failure only while it is the one that was read', async () => {
await capsule.record([marker()], NOW)
await fileFailure()
await capsule.forgetSuperseded(
[{ sessionId: SESSION, recordedAt: NOW, failedAt: NOW - 1 }],
NOW
)
expect(await capsule.listFailed(NOW)).toHaveLength(1)
await capsule.forgetSuperseded([{ sessionId: SESSION, recordedAt: NOW, failedAt: NOW }], NOW)
expect(await capsule.listFailed(NOW)).toEqual([])
})
// New user messages invalidate only the observed witness; preserve later teardown records.
it('forgets a superseded pending offer only for the witness that was read', async () => {
await capsule.record([marker()], NOW)
await capsule.forgetSuperseded([{ sessionId: SESSION, recordedAt: NOW - 1 }], NOW)
expect(await capsule.list(NOW)).toHaveLength(1)
await capsule.forgetSuperseded([{ sessionId: SESSION, recordedAt: NOW }], NOW)
expect(await capsule.list(NOW)).toEqual([])
})
it('does not forget an in-progress reservation as superseded', async () => {
await capsule.record([marker()], NOW)
await capsule.beginResume([SESSION], 'operation-a', NOW)
await capsule.forgetSuperseded([{ sessionId: SESSION, recordedAt: NOW }], NOW)
await capsule.rollbackResume('operation-a', NOW)
expect(await capsule.list(NOW)).toEqual([marker()])
})
it('forgets named records of any state and reports how many went', async () => {
await capsule.record(
[marker(), marker({ sessionId: 'second' }), marker({ sessionId: 'third' })],
NOW
)
await fileFailure()
expect(await capsule.dismiss([SESSION, 'second', 'missing'], NOW)).toBe(2)
expect(await capsule.list(NOW)).toEqual([marker({ sessionId: 'third' })])
expect(await capsule.listFailed(NOW)).toEqual([])
const publish = vi.spyOn(durable, 'renameDurable')
expect(await capsule.dismiss(['missing'], NOW)).toBe(0)
expect(publish).not.toHaveBeenCalled()
await capsule.record([marker()], NOW)
expect(await capsule.list(NOW)).toEqual([marker({ sessionId: 'third' }), marker()])
})
it('forgets every record of any state except the ones kept, without a fence', async () => {
await capsule.record(
[marker(), marker({ sessionId: 'second' }), marker({ sessionId: 'kept' })],
NOW
)
await fileFailure()
expect(await capsule.listFailed(NOW)).toHaveLength(1)
await capsule.beginResume(['second'], 'operation-b', NOW)
const keep = (stored: { sessionId: string }) => stored.sessionId === 'kept'
expect(await capsule.dismiss('all', NOW, keep)).toBe(2)
expect(await capsule.list(NOW)).toEqual([marker({ sessionId: 'kept' })])
expect(await capsule.listFailed(NOW)).toEqual([])
await capsule.record([marker()], NOW)
expect(await capsule.list(NOW)).toEqual([marker({ sessionId: 'kept' }), marker()])
})
it('keeps a months-old failure on record', async () => {
await capsule.record([marker()], NOW)
await fileFailure()
expect(await capsule.listFailed(NOW + 90 * 24 * 60 * 60 * 1000)).toHaveLength(1)
})
// Older parsers reject new entry states but ignore unknown top-level keys; store failures separately.
it('writes failures in a file an older build still reads its offers from', async () => {
const olderEntry = z.object({
state: z.enum(['pending', 'in-progress']),
operationId: z.string().min(1).optional(),
startedAt: z.number().int().nonnegative().optional(),
marker: z.unknown(),
replacement: z.unknown().optional()
})
const olderCapsule = z.object({
version: z.literal(2),
entries: z.array(z.unknown()),
dismissedAt: z.number().int().nonnegative().optional()
})
const olderStates = async () =>
olderCapsule
.parse(JSON.parse(await readFile(filePath, 'utf8')))
.entries.map((entry) => olderEntry.parse(entry).state)
await capsule.record([marker(), marker({ sessionId: 'second' })], NOW)
await fileFailure()
expect(await olderStates()).toEqual(['pending'])
await capsule.beginResume([SESSION], 'operation-retry', NOW)
expect((await olderStates()).sort()).toEqual(['in-progress', 'pending'])
expect(JSON.parse(await readFile(filePath, 'utf8'))).toMatchObject({
failed: [{ marker: { sessionId: SESSION } }]
})
})
// Downgrade must skip unknown failures without losing offers or blocking newer teardowns.
it('skips a failure record it cannot read instead of rejecting the whole file', async () => {
const readable = {
marker: marker(),
failedAt: NOW,
outcome: 'refused',
reason: 'agent_session_restart_work_superseded',
latestPrompt: '',
latestUserItemId: null
}
await writeFile(
filePath,
JSON.stringify({
version: 2,
entries: [{ state: 'pending', marker: marker({ sessionId: 'second' }) }],
failed: [
{ ...readable, marker: marker({ sessionId: 'future' }), outcome: 'later-outcome' },
{ ...readable, marker: { ...marker({ sessionId: 'future-marker' }), trigger: 'later' } },
readable
]
})
)
expect(await capsule.list(NOW)).toEqual([marker({ sessionId: 'second' })])
expect(await capsule.listFailed(NOW)).toEqual([readable])
await capsule.record([marker({ sessionId: 'third' })], NOW)
expect(await capsule.list(NOW)).toEqual([
marker({ sessionId: 'second' }),
marker({ sessionId: 'third' })
])
expect(await capsule.listFailed(NOW)).toEqual([readable])
expect(JSON.parse(await readFile(filePath, 'utf8')).failed).toEqual([readable])
})
it('keeps refusal details beside the code, read back against that code', async () => {
const readable = {
marker: marker(),
failedAt: NOW,
outcome: 'refused',
reason: 'agent_session_conflict',
latestPrompt: '',
latestUserItemId: null
}
await writeFile(
filePath,
JSON.stringify({
version: 2,
entries: [],
failed: [
{ ...readable, details: { reason: 'claimConflicted', note: 'dropped' } },
// Retired cause fields supply no current details.
{ ...readable, marker: marker({ sessionId: 'older' }), cause: 'claimConflicted' },
{
...readable,
marker: marker({ sessionId: 'foreign' }),
details: { reason: 'promptGone' }
}
]
})
)
expect(await capsule.listFailed(NOW)).toEqual([
{ ...readable, details: { reason: 'claimConflicted' } },
{ ...readable, marker: marker({ sessionId: 'older' }) },
{ ...readable, marker: marker({ sessionId: 'foreign' }) }
])
})
it('reads a malformed failure list as no failures', async () => {
await writeFile(
filePath,
JSON.stringify({
version: 2,
entries: [{ state: 'pending', marker: marker() }],
failed: { unexpected: true }
})
)
expect(await capsule.list(NOW)).toEqual([marker()])
expect(await capsule.listFailed(NOW)).toEqual([])
await capsule.record([marker({ sessionId: 'second' })], NOW)
expect(await capsule.list(NOW)).toEqual([marker(), marker({ sessionId: 'second' })])
})
it('rolls a failed acquisition back to a pending offer', async () => {
await capsule.record([marker()], NOW)
await capsule.beginResume([SESSION], 'operation-a', NOW)
expect(await capsule.list(NOW)).toEqual([])
await capsule.rollbackResume('operation-a', NOW)
expect(await capsule.list(NOW)).toEqual([marker()])
})
it('does not let another operation complete or roll back an active reservation', async () => {
await capsule.record([marker()], NOW)
await capsule.beginResume([SESSION], 'operation-a', NOW)
await capsule.completeResume('operation-b', [SESSION], NOW)
await capsule.rollbackResume('operation-b', NOW)
expect(await capsule.list(NOW)).toEqual([])
await capsule.rollbackResume('operation-a', NOW)
expect(await capsule.list(NOW)).toEqual([marker()])
})
it('preserves an active reservation when teardown records another session', async () => {
await capsule.record([marker()], NOW)
await capsule.beginResume([SESSION], 'operation-a', NOW)
await capsule.record([marker({ sessionId: 'second' })], NOW)
expect(await capsule.list(NOW)).toEqual([marker({ sessionId: 'second' })])
const raw = JSON.parse(await readFile(filePath, 'utf8'))
expect(raw.entries).toEqual(
expect.arrayContaining([
expect.objectContaining({
state: 'in-progress',
operationId: 'operation-a',
marker: expect.objectContaining({ sessionId: SESSION })
}),
expect.objectContaining({
state: 'pending',
marker: expect.objectContaining({ sessionId: 'second' })
})
])
)
})
it('keeps a newer same-session teardown behind an active reservation', async () => {
const newer = marker({
teardownId: 'teardown-new',
recordedAt: NOW + 1,
work: { kind: 'turn', id: 'turn-new' }
})
await capsule.record([marker()], NOW)
await capsule.beginResume([SESSION], 'operation-a', NOW)
await capsule.record([newer], NOW + 1)
expect(await capsule.list(NOW + 1)).toEqual([])
await capsule.rollbackResume('operation-a', NOW + 1)
expect(await capsule.list(NOW + 1)).toEqual([newer])
await capsule.beginResume([SESSION], 'operation-b', NOW)
await capsule.completeResume('operation-b', [SESSION], NOW)
expect(await capsule.list(NOW)).toEqual([])
})
it('reclaims an expired in-progress reservation on the next mutation', async () => {
await capsule.record([marker()], NOW)
await capsule.beginResume([SESSION], 'operation-a', NOW)
const later = NOW + 10 * 60 * 1000 + 1
// Read without writing; expired action leases appear pending.
expect(await capsule.list(later)).toEqual([marker()])
const reserved = await capsule.beginResume([SESSION], 'operation-b', later)
expect(reserved).toEqual([marker()])
await capsule.completeResume('operation-b', [SESSION], later)
expect(await capsule.list(later)).toEqual([])
})
it('dismisses pending and active recovery records', async () => {
await capsule.record([marker(), marker({ sessionId: 'second' })], NOW)
await capsule.beginResume([SESSION], 'operation-a', NOW)
expect(await capsule.clearAll(NOW)).toBe(1)
expect(await capsule.list(NOW)).toEqual([])
await capsule.rollbackResume('operation-a', NOW)
expect(await capsule.list(NOW)).toEqual([])
})
it('fences a late teardown write until a genuinely newer interruption', async () => {
await capsule.record([marker()], NOW)
await capsule.clearAll(NOW + 1)
// Model a teardown callback outliving another host's timed phase.
await capsule.record([marker()], NOW + 1)
expect(await capsule.list(NOW + 1)).toEqual([])
const newer = marker({ recordedAt: NOW + 2, teardownId: 'teardown-new' })
await capsule.record([newer], NOW + 2)
expect(await capsule.list(NOW + 2)).toEqual([newer])
// New interruptions must preserve the fence against older delayed callbacks.
await capsule.record([marker()], NOW + 2)
expect(await capsule.list(NOW + 2)).toEqual([newer])
})
it('keeps a legacy v1 file readable until a mutating operation migrates it', async () => {
const legacy = JSON.stringify({ version: 1, markers: [marker()] })
await writeFile(filePath, legacy)
expect(await capsule.list(NOW)).toEqual([marker()])
expect(await readFile(filePath, 'utf8')).toBe(legacy)
await capsule.record([marker({ sessionId: 'second' })], NOW)
expect(JSON.parse(await readFile(filePath, 'utf8'))).toMatchObject({ version: 2 })
expect(await capsule.list(NOW)).toEqual([marker(), marker({ sessionId: 'second' })])
})
it('preserves unreadable bytes on list and ordinary writes', async () => {
const corrupt = '{"version":2,"entries":[{"state":"pending"}]}'
await writeFile(filePath, corrupt)
await expect(capsule.list(NOW)).rejects.toThrow()
await expect(capsule.record([marker()], NOW)).rejects.toThrow()
expect(await readFile(filePath, 'utf8')).toBe(corrupt)
})
it('fails closed on duplicate session records instead of allowing a second resume', async () => {
const duplicate = JSON.stringify({
version: 2,
entries: [
{ state: 'in-progress', operationId: 'operation-a', startedAt: NOW, marker: marker() },
{ state: 'pending', marker: marker({ teardownId: 'duplicate' }) }
]
})
await writeFile(filePath, duplicate)
await expect(capsule.list(NOW)).rejects.toThrow('duplicate_session')
expect(await readFile(filePath, 'utf8')).toBe(duplicate)
})
it('lets explicit dismissal replace an unreadable file with an empty fence', async () => {
await writeFile(filePath, '{')
expect(await capsule.clearAll(NOW)).toBe(0)
await expect(capsule.list(NOW)).resolves.toEqual([])
expect(JSON.parse(await readFile(filePath, 'utf8'))).toMatchObject({
version: 2,
entries: [],
dismissedAt: NOW
})
})
it('preserves prior records when a durable publication fails', async () => {
await capsule.record([marker()], NOW)
const publish = failPublish()
await expect(capsule.record([marker({ sessionId: 'second' })], NOW)).rejects.toThrow(
'publish unavailable'
)
publish.mockRestore()
expect(await capsule.list(NOW)).toEqual([marker()])
})
it('preserves a pending offer when reservation publication fails', async () => {
await capsule.record([marker()], NOW)
const publish = failPublish()
await expect(capsule.beginResume([SESSION], 'operation-a', NOW)).rejects.toThrow(
'publish unavailable'
)
publish.mockRestore()
expect(await capsule.list(NOW)).toEqual([marker()])
})
it('preserves an active reservation when completion publication fails', async () => {
await capsule.record([marker()], NOW)
await capsule.beginResume([SESSION], 'operation-a', NOW)
const publish = failPublish()
await expect(capsule.completeResume('operation-a', [SESSION], NOW)).rejects.toThrow(
'publish unavailable'
)
publish.mockRestore()
expect(await capsule.list(NOW)).toEqual([])
await capsule.rollbackResume('operation-a', NOW)
expect(await capsule.list(NOW)).toEqual([marker()])
})
// Offers expire only by user action, never TTL or clock drift.
it.each([NOW - 90 * 24 * 60 * 60 * 1000, NOW + 1])(
'still lists a months-old or clock-skewed marker (%s)',
async (recordedAt) => {
await capsule.record([marker({ recordedAt })], recordedAt)
expect(await capsule.list(NOW)).toHaveLength(1)
}
)
it('reclaims stale durable-write debris without touching unrelated files', async () => {
const abandoned = `${filePath}.0.1.abandoned.tmp`
const recent = `${filePath}.0.2.recent.tmp`
const unrelated = join(directory, 'conversation.tmp')
await Promise.all([abandoned, recent, unrelated].map((path) => writeFile(path, 'debris')))
const old = new Date(Date.now() - 25 * 60 * 60 * 1000)
await utimes(abandoned, old, old)
await capsule.record([marker()], NOW)
expect(await readdir(directory)).toEqual(
expect.arrayContaining([
AGENT_SESSION_RECOVERY_CAPSULE_FILE,
`${AGENT_SESSION_RECOVERY_CAPSULE_FILE}.0.2.recent.tmp`,
'conversation.tmp'
])
)
expect(await readdir(directory)).not.toContain(
`${AGENT_SESSION_RECOVERY_CAPSULE_FILE}.0.1.abandoned.tmp`
)
})
})
it('does not retain lock timers after reads, writes, or failed publications', async () => {
vi.useFakeTimers({ toFake: ['setTimeout', 'clearTimeout', 'setInterval', 'clearInterval'] })
try {
expect(vi.getTimerCount()).toBe(0)
await capsule.record([marker()], NOW)
expect(vi.getTimerCount()).toBe(0)
await capsule.list(NOW)
expect(vi.getTimerCount()).toBe(0)
failPublish()
await expect(capsule.record([marker()], NOW)).rejects.toThrow()
expect(vi.getTimerCount()).toBe(0)
} finally {
vi.useRealTimers()
}
})
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