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import { abortable, linkSignals } from '@ydbjs/abortable'
import {
SessionRequest_PingPongSchema,
SessionRequest_SessionStartSchema,
SessionRequest_SessionStopSchema,
} from '@ydbjs/api/coordination'
import { loggers } from '@ydbjs/debug'
import { type MachineRuntime, createMachineRuntime } from '@ydbjs/fsm'
import { AsyncQueue } from '@ydbjs/fsm/queue'
import {
type Deferred,
SessionReconnectError,
SessionRequestRegistry,
createDeferred,
} from './session-registry.js'
import {
type CoordinationSessionClient,
type StreamEnvelope,
type StreamOpenParams,
type TransportCtx,
type TransportEffect,
type TransportEvent,
type TransportOutput,
type TransportState,
type WatchChange,
classifyMessage,
isAbortError,
transportTransition,
} from './session-state.js'
export type {
CoordinationSessionClient,
StreamEnvelope,
StreamOpenParams,
TransportOutput,
WatchChange,
}
let dbg = loggers.coordination.extend('transport')
// ── Watch subscription ─────────────────────────────────────────────────────────
export class WatchSubscription implements Disposable {
#transport: SessionTransport
#name: string
#disposed = false
queue: AsyncQueue<WatchChange>
reqId = 0n
constructor(transport: SessionTransport, name: string, queue: AsyncQueue<WatchChange>) {
this.#transport = transport
this.#name = name
this.queue = queue
}
updateReqId(reqId: bigint): void {
this.#transport.remapWatch(this.#name, this, reqId)
}
[Symbol.dispose](): void {
if (this.#disposed) {
return
}
this.#disposed = true
this.#transport.removeWatch(this.#name, this)
this.queue.close()
}
}
// ── Session transport ──────────────────────────────────────────────────────────
export class SessionTransport implements Disposable {
#ac = new AbortController()
#client: CoordinationSessionClient
#registry = new SessionRequestRegistry()
#readyDeferred: Deferred<void> = createDeferred<void>()
#destroyed = false
#watchesByName = new Map<string, WatchSubscription>()
#watchesByReqId = new Map<bigint, WatchSubscription>()
#streamAC: AbortController | null = null
#streamInput: AsyncQueue<StreamEnvelope> | null = null
#streamParams: StreamOpenParams | null = null
#streamIngestTask: Promise<void> | null = null
#machine: MachineRuntime<TransportState, TransportCtx, TransportEvent, TransportOutput>
constructor(client: CoordinationSessionClient) {
this.#client = client
this.#machine = createMachineRuntime<
TransportState,
TransportCtx,
{},
TransportEvent,
TransportEffect,
TransportOutput
>({
initialState: 'idle',
ctx: { wasEverReady: false },
env: {},
transition: transportTransition,
effects: {
'transport.effect.open_stream': () => {
this.#openStream()
},
'transport.effect.close_stream': async () => {
await this.#closeStream()
},
'transport.effect.send_pong': (_ctx, effect) => {
this.#sendPong(effect.opaque)
},
'transport.effect.send_stop': () => {
this.#sendStop()
},
'transport.effect.mark_ready': (_ctx, effect, runtime) => {
this.#markReady(effect.sessionId)
runtime.emit({ type: 'transport.stream.started', sessionId: effect.sessionId })
},
'transport.effect.mark_disconnected': (_ctx, _effect, runtime) => {
this.#markDisconnected()
runtime.emit({ type: 'transport.stream.disconnected' })
},
'transport.effect.notify_watches': () => {
this.notifyAllWatches()
},
'transport.effect.finalize': (_ctx, effect) => {
this.#finalize(effect.reason)
},
},
})
}
// ── Accessors ──────────────────────────────────────────────────────────────
get signal(): AbortSignal {
return this.#ac.signal
}
get state(): TransportState {
return this.#machine.state
}
// The parent session FSM iterates this to receive transport events.
get events(): AsyncIterable<TransportOutput> {
return this.#machine
}
// ── Commands (called by parent session FSM) ────────────────────────────────
connect(params: StreamOpenParams): void {
this.#streamParams = params
this.#machine.dispatch({ type: 'transport.connect' })
}
stop(): void {
this.#machine.dispatch({ type: 'transport.stop' })
}
close(): void {
this.#machine.dispatch({ type: 'transport.close' })
}
// ── Request multiplexing (called by business layer) ────────────────────────
send(envelope: StreamEnvelope): void {
Iif (!this.#streamInput || this.#streamInput.isClosed || this.#streamInput.isDestroyed) {
return
}
this.#streamInput.push(envelope)
}
// Send a request and wait for the matching response. Retries transparently
// on reconnect — allocates a fresh reqId each attempt because the server
// lost the previous request state.
async call(
buildEnvelope: (reqId: bigint) => StreamEnvelope,
signal?: AbortSignal
): Promise<import('@ydbjs/api/coordination').SessionResponse> {
for (;;) {
// oxlint-disable-next-line no-await-in-loop
await this.waitReady(signal)
let reqId = this.#registry.nextReqId()
using pending = this.#registry.register(reqId)
using combined = linkSignals(this.#ac.signal, signal)
try {
this.send(buildEnvelope(reqId))
// oxlint-disable-next-line no-await-in-loop
return await abortable(combined.signal, pending.promise)
} catch (error) {
if (error instanceof SessionReconnectError) {
continue
}
throw error
}
}
}
// Wait for a response to an already-sent request with a pinned reqId.
// Used by the acquire pending loop — the server tracks the waiter slot
// by reqId so it must not change across reconnects.
async callPinned(
reqId: bigint,
resend: () => void,
signal?: AbortSignal
): Promise<import('@ydbjs/api/coordination').SessionResponse> {
for (;;) {
using pending = this.#registry.register(reqId)
using combined = linkSignals(this.#ac.signal, signal)
try {
// oxlint-disable-next-line no-await-in-loop
return await abortable(combined.signal, pending.promise)
} catch (error) {
Iif (error instanceof SessionReconnectError) {
// oxlint-disable-next-line no-await-in-loop
await this.waitReady(signal)
resend()
continue
}
throw error
}
}
}
// ── Watch subscriptions ────────────────────────────────────────────────────
watch(name: string): WatchSubscription {
let previous = this.#watchesByName.get(name)
Iif (previous) {
previous[Symbol.dispose]()
}
let queue = new AsyncQueue<WatchChange>()
let subscription = new WatchSubscription(this, name, queue)
this.#watchesByName.set(name, subscription)
return subscription
}
remapWatch(name: string, subscription: WatchSubscription, reqId: bigint): void {
let active = this.#watchesByName.get(name)
Iif (active !== subscription) {
return
}
if (subscription.reqId !== 0n) {
this.#watchesByReqId.delete(subscription.reqId)
}
subscription.reqId = reqId
this.#watchesByReqId.set(reqId, subscription)
}
removeWatch(name: string, subscription: WatchSubscription): void {
let active = this.#watchesByName.get(name)
Eif (active === subscription) {
this.#watchesByName.delete(name)
}
if (subscription.reqId !== 0n) {
this.#watchesByReqId.delete(subscription.reqId)
}
}
notifyAllWatches(): void {
dbg.log('notifying %d active watches to re-read after reconnect', this.#watchesByName.size)
for (let subscription of this.#watchesByName.values()) {
subscription.queue.push({ dataChanged: false, ownersChanged: false })
}
}
// ── waitReady ──────────────────────────────────────────────────────────────
// Loops through transient reconnect rejections — each time readyDeferred
// is rejected the transport replaces it with a fresh one.
async waitReady(callerSignal?: AbortSignal): Promise<void> {
using combined = linkSignals(this.#ac.signal, callerSignal)
for (;;) {
try {
// oxlint-disable-next-line no-await-in-loop
await abortable(combined.signal, this.#readyDeferred.promise)
return
} catch (error) {
Eif (combined.signal.aborted) {
throw error
}
}
}
}
// ── Teardown ───────────────────────────────────────────────────────────────
destroy(reason: unknown): void {
this.#finalize(reason)
}
[Symbol.dispose](): void {
this.destroy(new Error('Transport disposed'))
}
// ── Internal ───────────────────────────────────────────────────────────────
#openStream(): void {
let params = this.#streamParams
Iif (!params) {
throw new Error('No stream params set — call connect() first')
}
// Dispose previous stream if any (fire-and-forget).
void this.#closeStream()
let ac = new AbortController()
let input = new AsyncQueue<StreamEnvelope>()
let grpcStream = this.#client.session(input, { signal: ac.signal })
input.push({
request: {
case: 'sessionStart',
value: create(SessionRequest_SessionStartSchema, {
path: params.path,
sessionId: params.sessionId ?? 0n,
timeoutMillis: BigInt(params.recoveryWindow),
description: params.description,
seqNo: 0n,
protectionKey: new Uint8Array(),
}),
},
})
dbg.log(
'connecting to %s (sessionId=%s, recoveryWindow=%dms)',
params.path,
params.sessionId ?? 'new',
params.recoveryWindow
)
let registry = this.#registry
let dispatch = this.#machine.dispatch.bind(this.#machine)
let handleWatch = this.#handleWatch.bind(this)
let endEmitted = false
let ingestTask = (async () => {
try {
for await (let response of grpcStream) {
// Responses and watch notifications are resolved directly —
// they bypass the FSM because they don't affect transport state.
let msg = classifyMessage(response)
if (msg && msg.kind === 'response') {
registry.resolve(msg.reqId, msg.response)
continue
}
if (msg && msg.kind === 'watch') {
handleWatch(msg.reqId, msg.change)
continue
}
// Everything else (ping, started, stopped, failure) goes
// through the transport FSM for state transitions.
dispatch({ type: 'transport.stream.message', response })
}
} catch (error) {
Iif (!isAbortError(error)) {
dispatch({ type: 'transport.stream.error', error })
}
} finally {
input.close()
Eif (!endEmitted) {
endEmitted = true
dispatch({ type: 'transport.stream.ended' })
}
}
})()
this.#streamAC = ac
this.#streamInput = input
this.#streamIngestTask = ingestTask
}
async #closeStream(): Promise<void> {
let ac = this.#streamAC
let input = this.#streamInput
let ingestTask = this.#streamIngestTask
this.#streamAC = null
this.#streamInput = null
this.#streamIngestTask = null
if (!ac) {
return
}
// Abort first so the gRPC read unblocks — without this
// the ingest task deadlocks waiting for a message that never arrives.
ac.abort(new Error('Stream disposed'))
input?.close()
// Wait for the ingest finally{} block so the ended event
// is dispatched before we return.
await ingestTask
}
#sendPong(opaque: bigint): void {
this.send({
request: {
case: 'pong',
value: create(SessionRequest_PingPongSchema, { opaque }),
},
})
}
#sendStop(): void {
dbg.log('requesting graceful session stop')
this.#registry.close()
this.send({
request: {
case: 'sessionStop',
value: create(SessionRequest_SessionStopSchema, {}),
},
})
}
#markReady(sessionId: bigint): void {
dbg.log('transport ready (sessionId=%s)', sessionId)
this.#readyDeferred.resolve()
}
#markDisconnected(): void {
dbg.log('transport disconnected, rejecting pending requests')
this.#registry.reconnect()
this.#readyDeferred.reject(new Error('Session reconnecting'))
this.#readyDeferred = createDeferred<void>()
}
#finalize(reason: unknown): void {
if (this.#destroyed) {
return
}
this.#destroyed = true
let watches = Array.from(this.#watchesByName.values())
for (let subscription of watches) {
subscription[Symbol.dispose]()
}
this.#registry.destroy(reason)
// Replace the deferred with an already-rejected one so that any future
// waitReady() call rejects immediately. The old deferred is safe to
// reject because createDeferred attaches a no-op .catch() guard.
this.#readyDeferred.reject(reason)
this.#readyDeferred = createDeferred<void>()
this.#readyDeferred.reject(reason)
this.#ac.abort(reason)
}
#handleWatch(reqId: bigint, change: WatchChange): void {
let subscription = this.#watchesByReqId.get(reqId)
if (!subscription) {
return
}
Eif (subscription.reqId === reqId) {
subscription.queue.push(change)
}
}
}
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