Files
deepseek-harness/packages/api/session-controller/tests/session.client.spec.ts
T
imccyu a4426261ab fix(ui-chat): fold next-message work details on one frame clock
Folding on the next message reserved the whole closing height as bottom
room and kept scrollTop whenever the input had no transcript echo on this
page: a message from another tab, a queued message delivered after the
previous Turn, or a send from a subagent child in the right Sidebar. A
reader below the fold was left on an empty viewport.

Every batch of closing rows now runs on the viewport's frame-clock driver.
It lands at the tail for this client's own input or a following reader and
otherwise keeps the reader's content still, installing only the room the
landing lacks. Subagent child sends register a local echo and pass its
request id to subagents.prompt, so the child's recorded message retires it.
2026-10-14 00:31:59 +08:00

1047 lines
53 KiB
TypeScript

/**
* Session object lifecycle, event-window transport, commands, and resync
* behavior, driven through the assembled client: every Remote call a Session
* makes crosses the roster's own Connection through the tier's `remote.<ns>`
* proxies and is answered by endpoint name.
*/
import { describe, expect, onTestFinished, vi } from 'vitest'
import { SessionSeq, type SessionEvent } from '@deepseek-ai/dsh-session/types'
import { AttachmentId } from '@deepseek-ai/dsh-attachment'
import type { SessionId } from '@deepseek-ai/dsh-api-remotes/client'
import { RemoteStreamCarrierError } from '@deepseek-ai/dsh-api-gateway/client'
import { RemoteError, type RemoteResult } from '@deepseek-ai/dsh-typert-protocol'
import { ok, type RemoteMock } from '@deepseek-ai/dsh-remote-mock'
import { createClientTest, type TestClient, webApp } from '@deepseek-ai/dsh-client-test-runtime/src/assembly/index.ts'
import { Session } from '../src/client/sessions/session.ts'
import { SessionEventStream } from '../src/client/transport.ts'
import type { SessionFollowRequest, SessionPage, SessionPageRequest } from '../src/types.ts'
import { entries, ev, historyValue, plainTurn } from './event-script.client.ts'
import { sessionBench } from './remote/bench.client.ts'
import {
FOLLOW, PAGE, err, followScript, followSnapshot, frame, history, pageRule, pushEvent,
} from './remote/session.client.ts'
/** A Session talks through the Gateway client; its dependency cone is the Typert registry and the Connection. */
const API_ROSTER = webApp.closure(['@deepseek-ai/dsh-api-gateway'])
const it = createClientTest({ roster: API_ROSTER })
const SID = 'fk-s1' as SessionId
const PARENT = 'fk-parent' as SessionId
const ADDRESS = { kind: 'session', sessionId: SID } as const
const TIME_ZONE = new Intl.DateTimeFormat().resolvedOptions().timeZone
/** The first client boot pays the cold module transform of the api cone. */
const COLD_BOOT_TIMEOUT_MS = 60_000
function windowEntries(session: Session) {
return session.eventSource.getSnapshot().entries
}
function eventSeqs(session: Session): number[] {
return windowEntries(session).map(entry => entry.event.seq)
}
describe('Session open', () => {
it('rejects a second scope binding until the owned scope is unbound', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
const client = await start()
session.bindScope(client.ctx)
expect(() => { session.bindScope(client.ctx.extend()) }).toThrow('already has a bound scope')
session.unbindScope()
expect(() => { session.bindScope(client.ctx.extend()) }).not.toThrow()
})
it('keeps a bare Session blank until an authoritative lifecycle signal arrives', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
expect(session.getSnapshot()).toMatchObject({ blank: true, promptAttempted: false, running: false })
session.handleRunning(true)
expect(session.getSnapshot()).toMatchObject({ blank: false, running: true })
}, COLD_BOOT_TIMEOUT_MS)
it('rejects a blank list hint when current metadata records a started conversation', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
session.projections.apply('sessionListMetadata', { blank: false, lastPromptAt: 1200 }, SessionSeq(8))
session.handleBlank(true)
expect(session.getSnapshot()).toMatchObject({ blank: false, promptAttempted: false, running: false })
})
it('installs the tail page: cold → loading → open with window and nodes in place', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
const page = plainTurn(SessionSeq(10), 3, '问', '答')
mock.stream(FOLLOW, followScript(history(page, true)))
expect(session.getSnapshot().openState).toBe('cold')
const opening = session.open()
expect(session.getSnapshot().openState).toBe('loading')
await opening
const snapshot = session.getSnapshot()
expect(snapshot.openState).toBe('open')
expect(snapshot.hasMore).toBe(true)
expect(eventSeqs(session)).toEqual([10, 11, 12, 13, 14, 15])
expect(session.eventSource.getSnapshot().change).toMatchObject({ kind: 'replace' })
})
it('is idempotent: concurrent opens share one follow, reopening when open is a no-op', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
await Promise.all([session.open(), session.open()])
await session.open()
expect(mock.log.requests(FOLLOW)).toHaveLength(1)
expect(mock.log.requests(PAGE)).toEqual([])
})
it('lands an error result in openState=error with the Remote failure kept', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(err(new RemoteError('session/not-found', 'gone', { sessionId: SID }))))
await session.open()
const snapshot = session.getSnapshot()
expect(snapshot.openState).toBe('error')
expect(snapshot.openError?.code).toBe('session/not-found')
})
it('lands exhausted carrier retries in openState=error as gateway/internal', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
// Two consecutive carrier losses before any opening is accepted exhaust the
// Gateway's retry budget; the escaping failure crosses the stream boundary marked.
mock.stream(FOLLOW, followScript(() => Promise.reject(new RemoteStreamCarrierError('history carrier down'))))
await session.open()
expect(session.getSnapshot().openState).toBe('error')
expect(session.getSnapshot().openError).toMatchObject({
code: 'gateway/internal', message: 'history carrier down',
})
expect(mock.log.requests(FOLLOW)).toHaveLength(2)
})
it('lands a Gateway-marked stream failure in openState=error', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(() => Promise.reject(new Error('socket died'))))
await session.open()
expect(session.getSnapshot().openState).toBe('error')
expect(session.getSnapshot().openError).toMatchObject({ code: 'gateway/internal', message: 'socket died' })
})
it('stitches live frames landing right behind the opening snapshot, dropping the page overlap', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
const gate = Promise.withResolvers<SessionPage>()
const page = plainTurn(SessionSeq(10), 0, '早', '安')
mock.stream(FOLLOW, async ([request], stream) => {
stream.push(followSnapshot(await gate.promise, request as SessionFollowRequest))
// Two live frames follow the snapshot before the opening settles; seq 15 overlaps its tail.
stream.push(frame(ev.turnStart(SessionSeq(15), 1)))
stream.push(frame(ev.user(SessionSeq(16), '插进来的')))
})
const opening = session.open()
gate.resolve(historyValue(page))
await opening
await mock.streams.drained(FOLLOW)
// Overlapping seq-15 frame (== page tail turn/end) was dropped; 16 appended once.
expect(eventSeqs(session)).toEqual([10, 11, 12, 13, 14, 15, 16])
})
})
describe('live event path', () => {
async function opened(mock: RemoteMock, start: () => Promise<TestClient>, events: SessionEvent[] = plainTurn(SessionSeq(0), 0, 'a', 'b')) {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(events)))
await session.open()
return session
}
it('drops replayed frames at or below the window tail', async ({ mock, start }) => {
const session = await opened(mock, start)
const before = session.eventSource.getSnapshot()
await pushEvent(mock, ev.user(SessionSeq(3), '重放'))
expect(session.eventSource.getSnapshot()).toBe(before)
})
it('keeps the authoritative host blank bit across unrelated log events', async ({ mock, start }) => {
const session = await opened(mock, start, [])
session.handleBlank(true)
await pushEvent(mock, ev.commandRun(SessionSeq(0), 'cmd-perm', 'permission', ' danger-full-access'))
await pushEvent(mock, ev.commandDone(SessionSeq(1), 'cmd-perm', 'success', 'preset danger-full-access'))
const snapshot = session.getSnapshot()
expect(eventSeqs(session)).toEqual([0, 1])
expect(snapshot.blank).toBe(true)
})
it('repairs a seq gap by repulling the tail page instead of appending a hole', async ({ mock, start }) => {
const session = await opened(mock, start, plainTurn(SessionSeq(0), 0, 'a', 'b')) // tail seq = 5
const repaired = [...plainTurn(SessionSeq(0), 0, 'a', 'b'), ...plainTurn(SessionSeq(6), 1, 'c', 'd')]
mock.remote.session.page.mockImplementation(pageRule(history(repaired)))
// seq 9 with tail 5 → gap; the event detours to the buffer and one page refetch fires.
await pushEvent(mock, ev.assistant(SessionSeq(9), 1, 'd'))
await vi.waitFor(() => {
expect(mock.log.requests(PAGE)).toHaveLength(1)
})
await vi.waitFor(() => {
expect(eventSeqs(session)).toEqual(
repaired.filter(event => event.seq <= 9).map(event => event.seq),
)
})
})
})
describe('paging', () => {
it('prepends an older page and keeps seq continuity', async ({ mock, start }) => {
const older = plainTurn(SessionSeq(0), 0, '旧问', '旧答')
const newer = plainTurn(SessionSeq(6), 1, '新问', '新答')
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(newer, true)))
mock.remote.session.page.mockImplementation(pageRule(history(older)))
await session.open()
await session.loadOlder()
const snapshot = session.getSnapshot()
expect(mock.log.requests(FOLLOW)).toMatchObject([{ maxMessages: 500, turnWindow: { minMessages: 50, minTurns: 2 } }])
expect(mock.log.requests(PAGE)).toEqual([
{ address: ADDRESS, throughSeq: 11, beforeSeq: 6, maxMessages: 500, turnWindow: { minMessages: 50, minTurns: 2 } },
])
expect(snapshot.hasMore).toBe(false)
expect(eventSeqs(session)).toEqual([...older, ...newer].map(event => event.seq))
})
it('installs a page without interpreting business replacement metadata', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history([
ev.compactSummary(SessionSeq(80), '窗外范围的摘要', SessionSeq(3), SessionSeq(40)),
ev.compactCheckpoint(SessionSeq(81), SessionSeq(80), SessionSeq(3), SessionSeq(40)),
ev.user(SessionSeq(82), '压缩后的新问题'),
], true)))
const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => undefined)
try {
await session.open()
const snapshot = session.getSnapshot()
expect(snapshot.openState).toBe('open')
expect(eventSeqs(session)).toEqual([80, 81, 82])
expect(errorSpy).not.toHaveBeenCalled()
} finally {
errorSpy.mockRestore()
}
})
it('drops a discontinuous older page fail-soft (window unchanged, hasMore cleared)', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(10), 1, '新', '页'), true)))
mock.remote.session.page.mockImplementation(pageRule(history(plainTurn(SessionSeq(0), 0, '断', '层'), true))) // tail seq 5, but baseSeq is 10 → hole
const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => undefined)
try {
await session.open()
const windowBefore = session.eventSource.getSnapshot()
await session.loadOlder()
const snapshot = session.getSnapshot()
expect(session.eventSource.getSnapshot().entries).toEqual(windowBefore.entries)
expect(snapshot.hasMore).toBe(false)
} finally {
errorSpy.mockRestore()
}
})
it('loadThrough pages repeatedly until the window covers the target seq', async ({ mock, start }) => {
const oldest = plainTurn(SessionSeq(0), 0, '最旧问', '最旧答')
const middle = plainTurn(SessionSeq(6), 1, '中问', '中答')
const newest = plainTurn(SessionSeq(12), 2, '新问', '新答')
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(newest, true)))
await session.open()
const gate = Promise.withResolvers<RemoteResult<SessionPage>>()
mock.remote.session.page.mockImplementation(pageRule(request => (request.beforeSeq === 12 ? history(middle, true) : history(oldest))))
mock.remote.session.page.mockReturnValueOnce(gate.promise)
const jump = session.loadThrough(SessionSeq(0))
expect(session.getSnapshot().loadingOlder).toBe(true)
gate.resolve(history(middle, true))
await jump
const snapshot = session.getSnapshot()
expect(snapshot.loadingOlder).toBe(false)
expect(eventSeqs(session)).toEqual([...oldest, ...middle, ...newest].map(event => event.seq))
expect(mock.log.requests(PAGE)).toMatchObject([
{ beforeSeq: 12, maxMessages: 500, turnWindow: { minMessages: 200, minTurns: 2 } },
{ beforeSeq: 6, maxMessages: 500, turnWindow: { minMessages: 200, minTurns: 2 } },
])
})
it('loadThrough is a no-op when the window already covers the target or the session is not open', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
await session.loadThrough(SessionSeq(0)) // cold: no-op
expect(mock.log.requests()).toEqual([])
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(6), 1, 'x', 'y'), true)))
await session.open()
const sent = mock.log.requests().length
await session.loadThrough(SessionSeq(6)) // baseSeq is already 6
await session.loadThrough(SessionSeq(9)) // inside the window
expect(mock.log.requests()).toHaveLength(sent)
})
it('publishes jump pages together while live events remain visible', async ({ mock, start }) => {
const oldest = plainTurn(SessionSeq(0), 0, 'old', 'answer')
const middle = plainTurn(SessionSeq(6), 1, 'middle', 'answer')
const newest = plainTurn(SessionSeq(12), 2, 'new', 'answer')
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(newest, true)))
await session.open()
const secondRequested = Promise.withResolvers<undefined>()
const lastPage = Promise.withResolvers<RemoteResult<SessionPage>>()
mock.remote.session.page.mockImplementation(pageRule((request) => {
if (request.beforeSeq === 12) return history(middle, true)
secondRequested.resolve(undefined)
return lastPage.promise
}))
const changes: string[] = []
onTestFinished(session.eventSource.subscribe(() => { changes.push(session.eventSource.getSnapshot().change.kind) }))
const jump = session.loadThrough(SessionSeq(0))
await secondRequested.promise
expect(changes).toEqual([])
expect(eventSeqs(session)).toEqual(newest.map(event => event.seq))
expect(session.getSnapshot().loadingOlder).toBe(true)
await pushEvent(mock, ev.turnStart(SessionSeq(18), 3))
expect(changes).toEqual(['append'])
expect(eventSeqs(session)).toEqual([...newest.map(event => event.seq), 18])
const nearerJump = session.loadThrough(SessionSeq(6))
expect(nearerJump).toBe(jump)
lastPage.resolve(history(oldest))
await jump
expect(changes).toEqual(['append', 'prepend'])
expect(eventSeqs(session)).toEqual(Array.from({ length: 19 }, (_, index) => index))
expect(session.eventSource.getSnapshot().change).toMatchObject({
kind: 'prepend', entries: entries([...oldest, ...middle]),
})
expect(session.getSnapshot()).toMatchObject({ loadingOlder: false, hasMore: false })
})
it('publishes the successful jump prefix once when a later page fails', async ({ mock, start }) => {
const middle = plainTurn(SessionSeq(6), 1, 'middle', 'answer')
const newest = plainTurn(SessionSeq(12), 2, 'new', 'answer')
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(newest, true)))
await session.open()
const changed = vi.fn()
onTestFinished(session.eventSource.subscribe(changed))
mock.remote.session.page.mockImplementation(pageRule(request => request.beforeSeq === 12
? history(middle, true)
: err(new RemoteError('gateway/internal', 'page unavailable', {}))))
await session.loadThrough(SessionSeq(0))
expect(changed).toHaveBeenCalledOnce()
expect(eventSeqs(session)).toEqual([...middle, ...newest].map(event => event.seq))
expect(session.getSnapshot()).toMatchObject({ loadingOlder: false, hasMore: true })
})
it('discards buffered jump pages when the Session replaces its stream', async ({ mock, start }) => {
const newest = plainTurn(SessionSeq(12), 2, 'new', 'answer')
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(newest, true)))
await session.open()
const secondRequested = Promise.withResolvers<undefined>()
const lastPage = Promise.withResolvers<RemoteResult<SessionPage>>()
mock.remote.session.page.mockImplementation(pageRule((request) => {
if (request.beforeSeq === 12) return history(plainTurn(SessionSeq(6), 1, 'middle', 'answer'), true)
secondRequested.resolve(undefined)
return lastPage.promise
}))
const changes: string[] = []
onTestFinished(session.eventSource.subscribe(() => { changes.push(session.eventSource.getSnapshot().change.kind) }))
const jump = session.loadThrough(SessionSeq(0))
await secondRequested.promise
const replacement = session.resync()
lastPage.resolve(history(plainTurn(SessionSeq(0), 0, 'old', 'answer')))
await Promise.all([jump, replacement])
expect(changes).toEqual(['replace'])
expect(eventSeqs(session)).toEqual(newest.map(event => event.seq))
expect(session.getSnapshot().loadingOlder).toBe(false)
})
it('loadThrough retargets a running jump to the lowest requested seq and shares its completion', async ({ mock, start }) => {
const oldest = plainTurn(SessionSeq(0), 0, 'a', 'b')
const middle = plainTurn(SessionSeq(6), 1, 'c', 'd')
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(12), 2, 'e', 'f'), true)))
await session.open()
const gate = Promise.withResolvers<RemoteResult<SessionPage>>()
mock.remote.session.page.mockImplementation(pageRule(history(oldest)))
mock.remote.session.page.mockReturnValueOnce(gate.promise)
const first = session.loadThrough(SessionSeq(6))
const second = session.loadThrough(SessionSeq(0))
gate.resolve(history(middle, true))
await Promise.all([first, second])
expect(eventSeqs(session)).toEqual([
...[...oldest, ...middle].map(event => event.seq),
12, 13, 14, 15, 16, 17,
])
expect(mock.log.requests(PAGE)).toHaveLength(2)
})
it('loadThrough refused by a busy pager leaves no target behind for later jumps', async ({ mock, start }) => {
const middle = plainTurn(SessionSeq(6), 1, 'c', 'd')
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(12), 2, 'e', 'f'), true)))
await session.open()
// A plain single-page pull holds the busy flag while the jump is refused.
const gate = Promise.withResolvers<RemoteResult<SessionPage>>()
mock.remote.session.page.mockReturnValueOnce(gate.promise)
const older = session.loadOlder()
await session.loadThrough(SessionSeq(0)) // refused: must not park seq 0 anywhere
gate.resolve(history(middle, true))
await older
// A later jump to a nearer seq pages exactly to it — a leaked 0 target
// would keep pulling three-event pages all the way to the head.
mock.remote.session.page.mockImplementation(pageRule((request) => {
const start = (request.beforeSeq ?? 0) - 3
return history(
[ev.user(SessionSeq(start), `u${String(start)}`), ev.user(SessionSeq(start + 1), `u${String(start + 1)}`), ev.user(SessionSeq(start + 2), `u${String(start + 2)}`)],
start > 0,
)
}))
await session.loadThrough(SessionSeq(4))
// Covered at seq 3 (≤ 4) after one page; a leaked 0 target would add a
// third call at beforeSeq 3 and pull the head to 0.
expect((mock.log.requests(PAGE) as SessionPageRequest[]).map(request => request.beforeSeq)).toEqual([12, 6])
expect(eventSeqs(session)[0]).toBe(3)
})
it('loadThrough stops paging when the event stream generation moves mid-loop', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(12), 2, 'x', 'y'), true)))
await session.open()
const gate = Promise.withResolvers<RemoteResult<SessionPage>>()
mock.remote.session.page.mockReturnValueOnce(gate.promise)
const jump = session.loadThrough(SessionSeq(0))
// The address is rebuilt while the first page is in flight; the same follow script serves the new generation.
const rebuilt = session.resync()
gate.resolve(history(plainTurn(SessionSeq(6), 1, 'c', 'd'), true))
await jump
await rebuilt
// The stale loop must not page the new generation toward its old target:
// the gated page is the only page call, and the resync opened a second follow.
expect(mock.log.requests(PAGE)).toHaveLength(1)
expect(mock.log.requests(FOLLOW)).toHaveLength(2)
expect(session.getSnapshot().loadingOlder).toBe(false)
})
it('loadThrough stops on a page that makes no progress instead of looping', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(12), 2, 'x', 'y'), true)))
mock.remote.session.page.mockImplementation(pageRule(history([], true))) // empty page still claiming more history
await session.open()
await session.loadThrough(SessionSeq(0))
expect(session.getSnapshot().loadingOlder).toBe(false)
expect(mock.log.requests(PAGE)).toHaveLength(1)
})
it('loadThrough fails soft on a page failure and clears its busy state: a folded carrier throw quietly, a local throw with console.error', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(12), 2, 'x', 'y'), true)))
await session.open()
const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => undefined)
const prepend = vi.spyOn(SessionEventStream.prototype, 'prepend')
try {
mock.remote.session.page.mockImplementation(() => Promise.reject(new Error('page wire down')))
await session.loadThrough(SessionSeq(0))
expect(errorSpy).not.toHaveBeenCalled() // the proxy folds the throw into a Remote failure, as the generated client would
expect(session.getSnapshot().loadingOlder).toBe(false)
prepend.mockRejectedValueOnce(new Error('local fault'))
await session.loadThrough(SessionSeq(0))
expect(errorSpy).toHaveBeenCalledWith('[session-controller] loadThrough failed:', expect.any(Error))
expect(session.getSnapshot().loadingOlder).toBe(false)
} finally {
prepend.mockRestore()
errorSpy.mockRestore()
}
})
it('ignores loadOlder while one is in flight (single request)', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(6), 1, 'x', 'y'), true)))
await session.open()
const gate = Promise.withResolvers<RemoteResult<SessionPage>>()
mock.remote.session.page.mockImplementation(pageRule(gate.promise))
const first = session.loadOlder()
const second = session.loadOlder()
gate.resolve(history(plainTurn(SessionSeq(0), 0, 'a', 'b')))
await Promise.all([first, second])
expect(mock.log.requests(FOLLOW)).toHaveLength(1)
expect(mock.log.requests(PAGE)).toHaveLength(1)
})
})
describe('prompt and cancel errors', () => {
const CHILD = { parentSessionId: PARENT, childSessionId: SID, mode: 'continuable' } as const
it('routes an addressed child through non-activating history, continuation prompt, and interrupt only', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID, { address: CHILD, parentAvailable: true })
await session.open()
const prompted = await session.prompt([{ type: 'text', text: '继续' }], 'queue')
const steered = await session.prompt([{ type: 'text', text: '现在处理' }], 'steer')
const cancelled = await session.cancel()
expect(prompted).toEqual({ ok: true, value: { accepted: true } })
expect(steered).toEqual({ ok: true, value: { accepted: true } })
expect(cancelled).toEqual({ ok: true, value: { accepted: true } })
expect(mock.log.requests(FOLLOW)).toEqual([
{ address: { kind: 'subagent', ...CHILD }, assistantStream: true, maxMessages: 500, turnWindow: { minMessages: 50, minTurns: 2 } },
])
expect(mock.log.requests(PAGE)).toEqual([])
// The prompt mode crosses the wire as the request's delivery.
expect(mock.log.requests('subagents/prompt')).toEqual([
{
requestId: expect.any(String) as unknown as string,
...CHILD,
delivery: 'queue',
content: [{ type: 'text', text: '继续' }],
clientTimeZone: TIME_ZONE,
},
{
requestId: expect.any(String) as unknown as string,
...CHILD,
delivery: 'steer',
content: [{ type: 'text', text: '现在处理' }],
clientTimeZone: TIME_ZONE,
},
])
// Positional parameters cross the wire as positional args.
expect(mock.log.calls('subagents/interruptByParent').map(call => call.args)).toEqual([[SID, PARENT, 'continuable']])
expect(mock.log.requests('session/prompt')).toEqual([])
expect(mock.log.requests('session/cancel')).toEqual([])
// A successful interrupt leaves no stop error behind.
expect(session.getSnapshot().promptError).toBeNull()
expect(session.getSnapshot().subagent).toEqual({ address: CHILD, parentAvailable: true })
})
it('sends an addressed child continuation under its echo request id and retires a refused echo', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID, { address: CHILD, parentAvailable: true })
await session.open()
const accepted = session.beginSubmission({ mode: 'queue', text: '继续', attachments: [] })
await session.prompt([{ type: 'text', text: '继续' }], 'queue', undefined, accepted.requestId)
expect(mock.log.requests('subagents/prompt')).toMatchObject([{ requestId: accepted.requestId, ...CHILD }])
expect(session.getSnapshot().pendingSubmissions.map(echo => echo.requestId)).toEqual([accepted.requestId])
const refused = session.beginSubmission({ mode: 'queue', text: '附件', attachments: [] })
await session.prompt([{ type: 'file', receiptId: 'receipt' as never }], 'queue', undefined, refused.requestId)
expect(session.getSnapshot().pendingSubmissions.map(echo => echo.requestId)).toEqual([accepted.requestId])
})
it('forwards continuation image parts to the subagent prompt Remote unstripped', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID, { address: CHILD, parentAvailable: true })
await session.open()
const content = [
{ type: 'text' as const, text: '看这张图' },
{ type: 'image' as const, mediaType: 'image/png' as const, data: 'aGk=', name: 'shot.png' },
]
const prompted = await session.prompt(content, 'queue')
expect(prompted).toEqual({ ok: true, value: { accepted: true } })
expect(mock.log.requests('subagents/prompt')).toEqual([
{
requestId: expect.any(String) as unknown as string,
...CHILD,
delivery: 'queue',
content,
clientTimeZone: TIME_ZONE,
},
])
expect(session.getSnapshot().promptError).toBeNull()
})
it('lands an interrupt business failure in promptError with op=stop', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID, { address: CHILD, parentAvailable: true })
mock.remote.subagents.interruptByParent.mockResolvedValue(err(new RemoteError('subagent/unauthorized', 'nope', { childSessionId: SID })))
await session.open()
const cancelled = await session.cancel()
expect(cancelled).toMatchObject({ ok: false, error: { code: 'subagent/unauthorized' } })
expect(session.getSnapshot().promptError).toMatchObject({
op: 'stop', error: { code: 'subagent/unauthorized' },
})
})
it('rejects staged files instead of dropping them from subagent continuations', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID, { address: CHILD, parentAvailable: true })
await session.open()
const prompted = await session.prompt([
{ type: 'file', receiptId: 'receipt' as never },
{ type: 'text', text: '继续' },
], 'queue')
expect(prompted).toMatchObject({
ok: false,
error: {
code: 'subagent/attachment-invalid',
details: { reason: 'SUBAGENT_FILE_UNSUPPORTED' },
},
})
expect(mock.log.requests('subagents/prompt')).toEqual([])
})
it('sends a one-shot address to the Host under the continuable marker', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID, { address: { ...CHILD, mode: 'one-shot' } })
mock.remote.subagents.prompt.mockResolvedValue(err(new RemoteError(
'subagent/not-resumable', 'subagent cannot be resumed', { childSessionId: SID },
)))
await session.open()
const prompted = await session.prompt([{ type: 'text', text: '继续' }], 'queue')
const cancelled = await session.cancel()
// The Host reads the durable descriptor; the wire marker stays 'continuable'.
expect(prompted).toMatchObject({ ok: false, error: { code: 'subagent/not-resumable' } })
expect(cancelled).toEqual({ ok: true, value: { accepted: true } })
expect(mock.log.requests('subagents/prompt')).toMatchObject([CHILD])
expect(mock.log.calls('subagents/interruptByParent').map(call => call.args)).toEqual([[SID, PARENT, 'continuable']])
expect(mock.log.requests(FOLLOW)).toEqual([
{ address: { kind: 'subagent', ...CHILD, mode: 'one-shot' }, assistantStream: true, maxMessages: 500, turnWindow: { minMessages: 50, minTurns: 2 } },
])
expect(mock.log.requests(PAGE)).toEqual([])
expect(mock.log.requests('session/cancel')).toEqual([])
})
it('delivers an image continuation to the Host without narrowing its upload parts', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID, { address: CHILD })
await session.open()
const prompted = await session.prompt(
[{ type: 'text', text: '看图' }, { type: 'image', mediaType: 'image/png', data: 'AA==' }],
'queue',
)
expect(prompted).toEqual({ ok: true, value: { accepted: true } })
expect(mock.log.requests('subagents/prompt')).toMatchObject([
{ content: [{ type: 'text' }, { type: 'image', mediaType: 'image/png', data: 'AA==' }] },
])
})
it('publishes the first-prompt lifecycle synchronously before the Remote settles', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
session.handleBlank(true)
expect(session.getSnapshot()).toMatchObject({
blank: true, promptAttempted: false, awaitingFirstTurn: false,
})
const inFlight = session.prompt([{ type: 'text', text: '要发的' }], 'queue')
expect(session.getSnapshot()).toMatchObject({
blank: true, promptAttempted: true, awaitingFirstTurn: true,
})
const result = await inFlight
expect(result.ok).toBe(true)
expect(session.getSnapshot()).toMatchObject({
blank: false, promptAttempted: true, awaitingFirstTurn: true,
})
expect(mock.log.requests('session/prompt')).toMatchObject([{
sessionId: SID,
mode: 'queue',
content: [{ type: 'text', text: '要发的' }],
clientTimeZone: TIME_ZONE,
}])
session.handleRunning(true)
expect(session.getSnapshot()).toMatchObject({ running: true, awaitingFirstTurn: false })
})
it('does not await a first turn when the history already contains one', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
session.handleBlank(false)
const inFlight = session.prompt([{ type: 'text', text: '继续' }], 'queue')
expect(session.getSnapshot()).toMatchObject({ blank: false, promptAttempted: true, awaitingFirstTurn: false })
expect((await inFlight).ok).toBe(true)
expect(session.getSnapshot()).toMatchObject({ blank: false, awaitingFirstTurn: false })
})
it('keeps an accepted first prompt converted when a later prompt is rejected', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
session.handleBlank(true)
expect((await session.prompt([{ type: 'text', text: '第一次' }], 'queue')).ok).toBe(true)
session.handleRunning(true)
session.handleRunning(false)
mock.remote.session.prompt.mockResolvedValue(err(new RemoteError('session/agent-busy', 'busy', { reason: 'x' })))
expect((await session.prompt([{ type: 'text', text: '第二次' }], 'queue')).ok).toBe(false)
expect(session.getSnapshot()).toMatchObject({
blank: false, running: false, awaitingFirstTurn: false,
promptError: { op: 'send', error: { code: 'session/agent-busy' } },
})
})
it('keeps the attempted-first-prompt state when the Host rejects the prompt', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
session.handleBlank(true)
mock.remote.session.prompt.mockResolvedValue(err(new RemoteError('session/agent-busy', 'busy', { reason: 'x' })))
const result = await session.prompt([{ type: 'text', text: '失败的' }], 'queue')
expect(result.ok).toBe(false)
expect(session.getSnapshot().promptError).toMatchObject({ op: 'send', error: { code: 'session/agent-busy' } })
expect(session.getSnapshot()).toMatchObject({
blank: true, promptAttempted: true, awaitingFirstTurn: true,
})
})
it('receives a carrier throw while cancelling as the client\'s gateway/internal fold, landing op=stop', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.remote.session.cancel.mockImplementation(() => Promise.reject(new Error('cancel transport down')))
const cancelled = await session.cancel()
expect(cancelled).toMatchObject({
ok: false, error: { code: 'gateway/internal', message: 'client api: session/cancel failed: cancel transport down' },
})
expect(session.getSnapshot().promptError).toMatchObject({ op: 'stop', error: { code: 'gateway/internal' } })
})
it('reads session-authorized attachment bytes and keeps the opaque id on the wire', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
const result = await session.readAttachment('attachment-1' as never)
expect(result).toEqual({
ok: true,
value: {
attachment: { attachmentId: 'a', mediaType: 'image/png', bytes: 1, width: 1, height: 1 },
data: Uint8Array.of(0),
},
})
expect(mock.log.requests('session/attachment')).toEqual([{
sessionId: SID, attachmentId: 'attachment-1',
}])
})
it('forwards attachment rejection without trying to decode absent bytes', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
const failure = new RemoteError('gateway/internal', 'attachment unavailable', {})
mock.remote.session.attachment.mockResolvedValueOnce(err(failure))
await expect(session.readAttachment(AttachmentId('missing'))).resolves.toMatchObject({ ok: false, error: failure })
})
it('reports an unmatched command and forwards execution failures without opening history', async ({ mock, start }) => {
const client = await start()
// The Gateway-only assembly has no commands contribution; this facade test supplies its unary dependency.
const session = new Session(SID, {
session: client.ctx.remote.session,
subagents: client.ctx.remote.subagents,
commands: mock.remote.commands,
$stream: client.ctx.remote.$stream.bind(client.ctx.remote),
})
onTestFinished(() => session.dispose())
mock.remote.commands.execute.mockResolvedValueOnce(ok(undefined))
await expect(session.command('/unknown')).resolves.toEqual({ ok: true, value: { matched: false } })
const failure = new RemoteError('gateway/internal', 'command unavailable', {})
mock.remote.commands.execute.mockResolvedValueOnce(err(failure))
await expect(session.command('/failed')).resolves.toMatchObject({ ok: false, error: failure })
expect(mock.log.requests(FOLLOW)).toHaveLength(0)
})
})
describe('rename', () => {
it('settles the title projection cell from the unary response (higher-seq-wins vs the push frame)', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.remote.session.rename.mockResolvedValue(ok({ title: '正名', seq: 7 }))
const result = await session.rename(' 正名 ')
expect(result).toMatchObject({ ok: true, value: { title: '正名', seq: 7 } })
expect(mock.log.requests('session/rename')).toMatchObject([{ sessionId: SID, title: ' 正名 ' }])
expect(session.projections.faceOf('title').getSnapshot()).toBe('正名')
// A stale lower-seq apply (the push-frame path routes into this same
// store) must not roll the settled value back.
session.projections.apply('title', '旧名', SessionSeq(3))
expect(session.projections.faceOf('title').getSnapshot()).toBe('正名')
})
it('returns the business error untouched and a carrier throw as the client\'s gateway/internal fold', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.remote.session.rename.mockResolvedValue(err(new RemoteError('session/title-invalid', 'empty', { sessionId: SID })))
const rejected = await session.rename(' ')
expect(rejected).toMatchObject({ ok: false, error: { code: 'session/title-invalid' } })
expect(session.projections.faceOf('title').getSnapshot()).toBeUndefined()
mock.remote.session.rename.mockImplementation(() => Promise.reject(new Error('rename transport down')))
const folded = await session.rename('x')
expect(folded).toMatchObject({ ok: false, error: { code: 'gateway/internal', message: 'client api: session/rename failed: rename transport down' } })
expect(session.projections.faceOf('title').getSnapshot()).toBeUndefined()
})
})
describe('remaining branches', () => {
it('receives a carrier throw while prompting as the client\'s gateway/internal fold, landing op=send', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.remote.session.prompt.mockImplementation(() => Promise.reject(new Error('prompt wire down')))
const prompted = await session.prompt([{ type: 'text', text: 'x' }], 'queue')
expect(prompted).toMatchObject({
ok: false, error: { code: 'gateway/internal', message: 'client api: session/prompt failed: prompt wire down' },
})
expect(session.getSnapshot().promptError).toMatchObject({ op: 'send', error: { code: 'gateway/internal' } })
})
it('cancel business error also lands op=stop promptError', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.remote.session.cancel.mockResolvedValue(err(new RemoteError('session/agent-busy', 'nope', { reason: 'r' })))
await session.cancel()
expect(session.getSnapshot().promptError).toMatchObject({ op: 'stop', error: { code: 'session/agent-busy' } })
})
it('loadOlder guards: not-open/no-hasMore no-op, err result kept window, empty page updates hasMore, throw fail-soft', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
await session.loadOlder() // cold: no-op, zero traffic
expect(mock.log.requests()).toEqual([])
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(6), 1, 'x', 'y'), true)))
await session.open()
// err result: window unchanged
mock.remote.session.page.mockResolvedValue(err(new RemoteError('gateway/internal', 'x', {})))
await session.loadOlder()
expect(eventSeqs(session)).toHaveLength(6)
expect(session.getSnapshot().hasMore).toBe(true)
// empty page: hasMore adopts the response
mock.remote.session.page.mockImplementation(pageRule(history([])))
await session.loadOlder()
expect(session.getSnapshot().hasMore).toBe(false)
// hasMore false now: further loadOlder is a guard no-op
const sent = mock.log.requests().length
await session.loadOlder()
expect(mock.log.requests()).toHaveLength(sent)
// failure paths, after a resync reopens hasMore from the follow snapshot: a carrier throw arrives folded as a
// Remote failure and stays quiet; a local throw fails soft with console.error
const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => undefined)
const prepend = vi.spyOn(SessionEventStream.prototype, 'prepend')
try {
await session.resync()
mock.remote.session.page.mockImplementation(() => Promise.reject(new Error('page wire down')))
await session.loadOlder()
expect(errorSpy).not.toHaveBeenCalled()
expect(session.getSnapshot().loadingOlder).toBe(false)
prepend.mockRejectedValueOnce(new Error('local fault'))
await session.loadOlder()
expect(errorSpy).toHaveBeenCalledWith('[session-controller] loadOlder failed:', expect.any(Error))
expect(session.getSnapshot().loadingOlder).toBe(false)
} finally {
prepend.mockRestore()
errorSpy.mockRestore()
}
})
it('subscribe delivers snapshot-change notifications and unsubscribes', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(0), 0, 'a', 'b'))))
let notified = 0
const unsubscribe = session.subscribe(() => { notified++ })
await session.open()
await new Promise(resolve => setTimeout(resolve, 0))
expect(notified).toBeGreaterThan(0)
const seen = notified
unsubscribe()
session.handleRunning(true) // any snapshot mutation; the listener must stay silent
await new Promise(resolve => setTimeout(resolve, 0))
expect(notified).toBe(seen)
})
it('records an opening page that does not end at the opening cursor', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(0), 0, 'a', 'b')), { cursor: 11 }))
await session.open()
expect(mock.log.requests(FOLLOW)).toHaveLength(1)
const snapshot = session.getSnapshot()
expect(snapshot.openState).toBe('error')
expect(snapshot.openError).toMatchObject({
code: 'gateway/internal', message: 'session event stream page did not end at its requested cursor',
})
expect(eventSeqs(session)).toEqual([])
})
it('deduplicates repeated running flips and records removal', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
const before = session.getSnapshot()
session.handleRunning(false) // already false: dedup branch
expect(session.getSnapshot()).toBe(before)
session.handleRemoved()
expect(session.getSnapshot().removed).toBe(true)
})
it('drops live events while cold/error (no window upkeep)', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
await pushEvent(mock, ev.user(SessionSeq(0), '冷态帧')) // no follow is open: nothing receives it
expect(eventSeqs(session)).toEqual([])
mock.stream(FOLLOW, followScript(err(new RemoteError('gateway/internal', 'x', {}))))
await session.open()
await pushEvent(mock, ev.user(SessionSeq(0), '错态帧'))
expect(eventSeqs(session)).toEqual([])
})
it('preserves a Host-reported failure that terminates the live source', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(0), 0, 'a', 'b'))))
await session.open()
const failure = new RemoteError('session/not-found', 'session disappeared', { sessionId: SID })
mock.streams.fail(FOLLOW, failure)
await vi.waitFor(() => { expect(session.getSnapshot().openState).toBe('error') })
expect(session.getSnapshot().openError).toMatchObject({
code: failure.code, message: failure.message, details: failure.details,
})
})
it('coalesces queued gap frames behind one repair and exposes a failed repair', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(0), 0, 'a', 'b'))))
await session.open()
const gate = Promise.withResolvers<RemoteResult<SessionPage>>()
mock.remote.session.page.mockImplementation(pageRule(gate.promise))
await pushEvent(mock, ev.user(SessionSeq(9), '洞一'))
await pushEvent(mock, ev.user(SessionSeq(10), '洞二'))
await vi.waitFor(() => { expect(mock.log.requests(PAGE)).toHaveLength(1) })
gate.resolve(err(new RemoteError('gateway/internal', 'repair wire down', {})))
await vi.waitFor(() => { expect(session.getSnapshot().openState).toBe('error') })
expect(session.getSnapshot().openError).toMatchObject({ code: 'gateway/internal', message: 'repair wire down' })
expect(eventSeqs(session)).toHaveLength(6)
})
it('drops a stale opening without replacing the new generation error state', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
const stale = Promise.withResolvers<RemoteResult<SessionPage>>()
mock.stream(FOLLOW, followScript(() => stale.promise))
const opening = session.open()
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(0), 0, 'a', 'b'))))
const resynced = session.resync()
stale.reject(new Error('stale wire'))
await Promise.all([opening, resynced])
expect(session.getSnapshot().openState).toBe('open') // stale catch did not write error
})
it('drops a stale doOpen whose history resolved successfully after resync superseded it', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
const stale = Promise.withResolvers<RemoteResult<SessionPage>>()
mock.stream(FOLLOW, followScript(() => stale.promise))
const opening = session.open()
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(6), 1, '新', '代'))))
const resynced = session.resync()
stale.resolve(history(plainTurn(SessionSeq(0), 0, '旧', '代'))) // success, but its generation is gone
await Promise.all([opening, resynced])
expect(eventSeqs(session)).toEqual(plainTurn(SessionSeq(6), 1, '新', '代').map(event => event.seq))
})
it('drops a gap repair superseded by a full resync while its pull was in flight', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(0), 0, 'a', 'b'))))
await session.open()
const repairPull = Promise.withResolvers<RemoteResult<SessionPage>>()
mock.remote.session.page.mockImplementation(pageRule(repairPull.promise))
await pushEvent(mock, ev.user(SessionSeq(9), '洞'))
await vi.waitFor(() => { expect(mock.log.requests(PAGE)).toHaveLength(1) })
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(6), 1, 'c', 'd'))))
const resynced = session.resync() // bumps the generation
repairPull.resolve(history(plainTurn(SessionSeq(0), 0, '旧', '页'))) // repair result: stale, dropped
await resynced
expect(eventSeqs(session)).toEqual(plainTurn(SessionSeq(6), 1, 'c', 'd').map(event => event.seq))
})
it('successful cancel leaves no promptError', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(0), 0, 'a', 'b'))))
await session.open()
const result = await session.cancel()
expect(result.ok).toBe(true)
expect(session.getSnapshot().promptError).toBeNull()
})
it('carries raw history and follow events through the event feed', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
const historyCall = ev.toolCall(SessionSeq(6), 1, 'h1', 'bash', '{"cmd":"pwd"}')
const historyResult = ev.toolResult(SessionSeq(7), 1, 'h1', 'done')
mock.stream(FOLLOW, followScript(history([...plainTurn(SessionSeq(0), 0, 'a', 'b'), historyCall, historyResult])))
await session.open()
expect(windowEntries(session).slice(-2)).toEqual(entries([historyCall, historyResult]))
const liveCall = ev.toolCall(SessionSeq(8), 2, 'l1', 'write', '{"file_path":"a.ts"}')
await pushEvent(mock, liveCall)
expect(windowEntries(session).at(-1)).toEqual(frame(liveCall))
const liveResult = ev.toolResult(SessionSeq(9), 2, 'l1', 'ok')
await pushEvent(mock, liveResult)
expect(windowEntries(session).at(-1)).toEqual(frame(liveResult))
})
})
describe('resync', () => {
it('keeps the old feed until the reconnect snapshot, then repairs queued live gaps', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(0), 0, '旧', '窗'))))
await session.open()
const oldWindow = session.eventSource.getSnapshot()
const replacement = Promise.withResolvers<SessionPage>()
// The reconnect generation: its snapshot is gated, then two live frames land out of order right behind it.
mock.stream(FOLLOW, async ([request], stream) => {
stream.push(followSnapshot(await replacement.promise, request as SessionFollowRequest))
stream.push(frame(ev.user(SessionSeq(17), '后到高位')))
stream.push(frame(ev.user(SessionSeq(16), '后到低位')))
})
mock.remote.session.page.mockImplementation(pageRule(history([
...plainTurn(SessionSeq(10), 2, '终', '页'),
ev.user(SessionSeq(16), '后到低位'),
ev.user(SessionSeq(17), '后到高位'),
])))
const publications: ReturnType<Session['eventSource']['getSnapshot']>[] = []
const off = session.eventSource.subscribe(() => {
publications.push(session.eventSource.getSnapshot())
})
const syncing = session.resync()
await vi.waitFor(() => { expect(mock.log.requests(FOLLOW)).toHaveLength(2) })
expect(session.eventSource.getSnapshot()).toBe(oldWindow)
expect(publications).toEqual([])
replacement.resolve(historyValue(plainTurn(SessionSeq(10), 2, '终', '页')))
await syncing
await vi.waitFor(() => {
expect(eventSeqs(session)).toEqual([10, 11, 12, 13, 14, 15, 16, 17])
})
expect(publications).toHaveLength(2)
expect(publications.map(snapshot => snapshot.change.kind)).toEqual(['replace', 'replace'])
expect(publications[0]?.entries.map(entry => entry.event.seq)).toEqual([10, 11, 12, 13, 14, 15])
expect(publications[1]?.entries.map(entry => entry.event.seq)).toEqual([10, 11, 12, 13, 14, 15, 16, 17])
off()
})
it('rebuilds the window without clearing control state', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(0), 0, 'a', 'b'))))
await session.open()
session.handleRunning(true)
session.handleAgentError('still visible')
mock.stream(FOLLOW, followScript(history([...plainTurn(SessionSeq(0), 0, 'a', 'b'), ...plainTurn(SessionSeq(6), 1, 'c', 'd')])))
await session.resync()
const snapshot = session.getSnapshot()
expect(snapshot.openState).toBe('open')
expect(snapshot.running).toBe(true)
expect(snapshot.lastAgentError).toBe('still visible')
expect(eventSeqs(session)).toHaveLength(12)
})
it('does not resync a cold Session', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
await session.resync()
expect(mock.log.requests()).toEqual([])
})
it('drops a stale in-flight open superseded by resync (generation guard)', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
const stale = Promise.withResolvers<RemoteResult<SessionPage>>()
mock.stream(FOLLOW, followScript(() => stale.promise))
const firstOpen = session.open()
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(6), 1, '新', '代'))))
const resynced = session.resync()
stale.reject(new Error('dead connection')) // the doomed pre-disconnect request fails late
await firstOpen
await resynced
const snapshot = session.getSnapshot()
expect(snapshot.openState).toBe('open') // stale failure did not settle the fresh generation into error
expect(eventSeqs(session)).toEqual(plainTurn(SessionSeq(6), 1, '新', '代').map(event => event.seq))
})
})
describe('snapshot ownership', () => {
it('publishes event-window appends without changing an unrelated Session snapshot', async ({ mock, start }) => {
const session = await sessionBench(mock, start, SID)
mock.stream(FOLLOW, followScript(history(plainTurn(SessionSeq(0), 0, '稳', '定'))))
await session.open()
const sessionBefore = session.getSnapshot()
const windowBefore = session.eventSource.getSnapshot()
const firstEntry = windowBefore.entries[0]
await pushEvent(mock, ev.user(SessionSeq(6), '追加'))
const windowAfter = session.eventSource.getSnapshot()
expect(session.getSnapshot()).toBe(sessionBefore)
expect(windowAfter).not.toBe(windowBefore)
expect(windowAfter.entries[0]).toBe(firstEntry)
expect(windowAfter.change).toMatchObject({ kind: 'append' })
})
})