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refactor(session): fold the session family into packages/session/

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git mv the 12 packages from session-persistence/, session-projection/,
session-title/, and telemetry/ into one session/ group per the
regrouping RFC; merge the four group READMEs into one bilingual
triplet; rewrite the group segment in tsconfig references (intra-group
references shorten to ../<pkg>), tsconfig.base.json paths/globs,
knip.json keys, vitest include, gate scripts, and authored doc/note
citations; regenerate module graph, doc graphs, catalogs, and the
lockfile importer keys. No npm names change.

Full unit suite: 8779 passed; the 18 reported failures reproduce as
env flakes (ambient-proxy IPv6 tunneling, watched-dir inotify
timeouts under parallel load) — each passes in isolation with
NO_PROXY set, matching their known pre-existing behavior on master.
This commit is contained in:
Tianyi Cui
2026-07-30 01:52:06 +08:00
parent 645fcf5713
commit 7e445c3a67
220 changed files with 258 additions and 286 deletions
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packages/session/session-telemetry/src/coordinator.ts
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/**
* Capture coordinator: the seam's upstream half. Live capture subscribes to
* the session firehose plus the one live-bus relay (`agent/error`). Both
* capture paths apply the fixed chunk projection, build logical records, and
* run each through the
* `telemetry/record` waterfall (deployment-mounted redaction rules;
* pass-through when none), then hands the result to the backend. Live capture
* follows the session firehose; on-demand capture replays the canonical log
* only when requested. Every synchronous handler is self-contained so a
* failing backend can never starve other subscribers (cordis `emit` is
* stop-on-throw) or touch the agent loop. Composed by a backend in its
* constructor.
*
* @module @deepseek-ai/dsh-session-telemetry/coordinator
*/
import type { Context } from 'cordis'
import type { Session, SessionEvent } from '@deepseek-ai/dsh-session'
import type { Agent } from '@deepseek-ai/dsh-agent'
import type { TelemetryBackend, TelemetryRecord, TelemetrySeverity } from './index.ts'
/** Whether capture follows live events or reads the canonical log only when requested. */
export type TelemetryCapture = 'live' | 'on-demand'
/** One projected record ready for backend handoff. */
interface ProjectedRecord {
readonly record: TelemetryRecord
/** Ledger cursor advanced only after the backend accepts this record. */
readonly seq?: number
}
/**
* The handoff cursor: per session, the highest `seq` handed to a backend.
* Deliberately MODULE-scope ambient state — a narrow, documented exception
* to the registrations-are-effects discipline: cordis has no HMR
* state-handover API, and keying by the `Session` object (which belongs to
* the session store and outlives any telemetry fiber) is the only in-process
* lifetime that lets a re-adopting fiber resume instead of re-handing
* history. Entries die with their sessions; a missing entry safely means
* "re-hand everything". Advanced only at emit time — the cursor marks
* handed-off, not delivered.
*/
const handoffCursor = new WeakMap<Session, number>()
/**
* Install the telemetry capture side onto a context for one backend.
*
* Live capture registers the persistence-coordinator listener set plus the
* `agent/error` relay, all through `ctx.effect()`/`ctx.on()` on the composing
* fiber, and sweeps already-live sessions (a hot reload does not replay
* `session/created`). A `session/disposed` captures the session's `shutdown`
* operational record at its own termination edge and retires it from the
* adopted set. On-demand capture registers none of those continuous listeners;
* {@link captureSession} reads the canonical log explicitly and never creates
* operational records. Disposal captures shutdown markers for live-adopted
* sessions, then awaits the backend's `shutdown()`; a failure there warns
* instead of throwing — best-effort reporting must not fail application
* teardown.
*/
export class TelemetryCoordinator {
/**
* Sessions adopted by THIS fiber and still live, for double-adoption
* protection and the teardown sweep of unmarked sessions;
* `session/disposed` marks and retires entries.
*/
private readonly adopted = new Set<Session>()
/** Per session, the `turn:step` keys whose first chunk already shipped; rebuilt from the log on re-adoption. */
private readonly chunkSeen = new WeakMap<Session, Set<string>>()
/**
* @param ctx - the composing backend's context; listeners bind to its fiber.
* @param backend - the backend receiving records; owned elsewhere, never disposed here beyond `shutdown()` forwarding.
* @param capture - follow live events, or wait for explicit canonical-log capture.
*/
constructor(
private readonly ctx: Context,
private readonly backend: TelemetryBackend,
capture: TelemetryCapture = 'live',
) {
if (capture === 'live') {
ctx.on('session/created', (session) => {
this.adopt(session)
})
// Capture the shutdown marker at the session's own termination edge,
// then retire the only strong reference owned by this coordinator.
ctx.on('session/disposed', (session) => {
this.contain(() => {
if (!this.adopted.delete(session)) return
this.deliver(session, { record: this.redact(shutdownRecord(session)) })
})
})
ctx.on('session/event', (session, event) => {
this.contain(() => {
this.captureEvent(session, event)
})
})
// Parallel listeners are awaited by the loop at turn end; returning void
// (not the SDK's flush promise) is the turn-latency contract.
ctx.on('session/flush', (session) => {
this.contain(() => {
this.hintFlush(session)
})
})
ctx.on('agent/error', ({ agent, turn, step, error }) => {
this.contain(() => {
this.relayAgentError(agent, turn, step, error)
})
})
for (const session of ctx.sessions.list()) {
this.adopt(session)
}
}
ctx.effect(() => async () => {
// Sessions still adopted here are alive through whole-application
// teardown, so capture the marker before the backend quiesces.
for (const session of this.adopted) {
this.contain(() => {
this.deliver(session, { record: this.redact(shutdownRecord(session)) })
})
}
try {
await this.backend.shutdown()
} catch (error) {
this.ctx.logger.warn(`telemetry: backend shutdown failed: ${String(error)}`)
}
}, 'telemetry capture')
}
/**
* Project and hand over the canonical session-log suffix after the handoff
* cursor, optionally stopping at an inclusive sequence boundary. Redaction
* runs during this call, so an on-demand caller retains no copied records
* before requesting capture and uses the policy mounted at that time.
* Backend and policy failures remain contained per event and do not starve
* later events in the same replay.
* @param session - session whose current canonical-log prefix may be handed over.
* @param throughSeq - optional last sequence included in this capture.
*/
captureSession(session: Session, throughSeq?: number): void {
const cursor = handoffCursor.get(session) ?? session.firstLiveSeq - 1
// Containment is PER EVENT: one rejected record is withheld fail-closed
// while the rest of the historical replay proceeds.
for (const event of session.events) {
if (throughSeq !== undefined && event.seq > throughSeq) break
this.contain(() => {
if (event.seq <= cursor) this.track(session, event)
else this.captureEvent(session, event)
})
}
}
/**
* Adopt a session: replay its log THROUGH the projection from the handoff
* cursor, then rely on the firehose for everything after. When no cursor
* survived, replay starts at the session's construction boundary
* (`firstLiveSeq`), not seq 0: constructor seeds never publish on the
* firehose, and their content already left the process under another
* identity — the same id in a previous process (resume) or the parent's
* stream (fork, stitched by receivers via `session.seed_length`). Events
* at or below the start still feed the projection state (first-chunk
* tracking) without being re-handed, so a resumed fiber drops mid-step
* chunk continuations exactly like the fiber that saw the step begin. The
* cost, accepted with the seam's at-most-once stance: a resume no longer
* backfills records a previous process failed to deliver.
* @param session - the live session to adopt; a second adoption is a no-op.
*/
private adopt(session: Session): void {
if (this.adopted.has(session)) return
this.adopted.add(session)
this.captureSession(session)
}
/** Feed the chunk projection without handing off — the ≤cursor half of re-adoption. */
private track(session: Session, event: SessionEvent): void {
if (event.type === 'assistant/chunk') {
this.seen(session).add(`${event.data.turn}:${event.data.step}`)
}
}
/** Project, redact, and hand one event to the backend. */
private captureEvent(session: Session, event: SessionEvent): void {
if (event.type === 'assistant/chunk') {
const key = `${event.data.turn}:${event.data.step}`
const seen = this.seen(session)
// Fixed chunk projection: only the first chunk of each (turn, step)
// ships — the stream-started signal; content is byte-complete in the
// step's assembled assistant/message. Dropped chunks do not advance
// the cursor, so re-adoption re-drops them deterministically.
if (seen.has(key)) return
seen.add(key)
}
this.deliver(session, {
record: this.redact({
channel: 'ledger',
time: event.time,
severity: severityOf(event),
attributes: identityOf(session, event),
// The canonical event object is mutable and the backend serializes
// later; append-time validation guarantees this clone cannot throw.
body: structuredClone(event.data),
}),
seq: event.seq,
})
}
/**
* Run the `telemetry/record` waterfall at capture time. The innermost `next`
* passes the record through unchanged — the seam ships no rules; exported
* data is as clean as the listeners a deployment mounts. Callers run inside
* {@link contain}, so a throwing rule withholds the record instead of
* reaching the loop (fail-closed). On-demand capture invokes this waterfall
* while reading the canonical session log, not when the event was appended.
*/
private redact(record: TelemetryRecord): TelemetryRecord {
return this.ctx.waterfall('telemetry/record', record, () => record)
}
/** Hand one redacted record to the backend, then advance its ledger cursor. */
private deliver(session: Session, pending: ProjectedRecord): void {
this.backend.emit(pending.record)
if (pending.seq !== undefined) handoffCursor.set(session, pending.seq)
}
/** Forward the turn-end boundary to the backend's optional flush hint. */
private hintFlush(session: Session): void {
if (this.adopted.has(session)) this.backend.flush?.()
}
/** Relay one `agent/error` bus emission as an `agent-error` operational record. */
private relayAgentError(agent: Agent, turn: number, step: number, error: unknown): void {
const detail = errorDetail(error)
this.deliver(agent.session, {
record: this.redact({
channel: 'ops',
time: Date.now(),
severity: 'error',
attributes: {
'telemetry.op': 'agent-error',
'session.id': String(agent.session.id),
'agent.id': agent.id,
'error.name': detail.name,
turn,
step,
},
body: detail,
}),
})
}
/** Lazily create the per-session first-chunk tracking set. */
private seen(session: Session): Set<string> {
let set = this.chunkSeen.get(session)
if (!set) this.chunkSeen.set(session, set = new Set())
return set
}
/**
* Run one capture-side step with its exception contained: cordis `emit`
* is stop-on-throw, so a throwing listener would starve every subscriber
* registered after this plugin — nothing from the backend may escape.
*/
private contain(step: () => void): void {
try {
step()
} catch (error) {
this.ctx.logger.warn(`telemetry: capture step failed: ${String(error)}`)
}
}
}
/**
* Build the per-session clean-exit marker: emitted at the session's own
* disposal edge, or at coordinator dispose for sessions still alive then.
*/
function shutdownRecord(session: Session): TelemetryRecord {
return {
channel: 'ops',
time: Date.now(),
severity: 'info',
attributes: { 'telemetry.op': 'shutdown', 'session.id': String(session.id) },
body: { op: 'shutdown' },
}
}
/** Map an event's own outcome flag to the pre-baked alerting severity. */
function severityOf(event: SessionEvent): TelemetrySeverity {
switch (event.type) {
case 'tool/result':
return event.data.message.content[0].isError === true ? 'error' : 'info'
case 'turn/end':
return event.data.reason.kind === 'error' ? 'error' : 'info'
default:
// Merge-extensible fall-through (no assertNever): event types this seam
// does not depend on — including plugin-merged ones it never heard of —
// pass through as info; their owners' outcome semantics stay theirs.
return 'info'
}
}
/** Normalize the live bus's arbitrary thrown value into the stable operational-record shape. */
function errorDetail(error: unknown): { name: string; message: string } {
const normalized = error instanceof Error ? error : new Error(String(error))
return { name: normalized.name, message: normalized.message }
}
/** Build the minimal identity attributes: envelope plus self-contained header facts. */
function identityOf(session: Session, event: SessionEvent): Record<string, string | number> {
const attributes: Record<string, string | number> = {
'session.id': String(session.id),
'event.type': event.type,
'event.seq': event.seq,
}
const { cwd, parentSession, seedLength } = session.header
if (cwd !== undefined) attributes['session.cwd'] = cwd
if (parentSession !== undefined) attributes['session.parent_id'] = String(parentSession)
// The durable fork boundary: a forked stream starts here, and its prefix
// lives in the parent's stream — receivers stitch on (parent_id, seed_length).
if (seedLength !== undefined) attributes['session.seed_length'] = seedLength
return attributes
}