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import type { SessionResponse } from '@ydbjs/api/coordination'
import { StatusIds_StatusCode } from '@ydbjs/api/operation'
import { YDBError } from '@ydbjs/error'
import { SessionClosedError, SessionExpiredError } from '../errors.js'
import type { TransitionResult, TransitionRuntime } from '@ydbjs/fsm'
export type SessionState =
| 'idle'
| 'ready'
| 'closed'
| 'expired'
| 'closing'
| 'connecting'
| 'reconnecting'
export type SessionCtx = {
sessionId: bigint | null
retryScheduled: boolean
hasEverConnected: boolean
recoveryScheduled: boolean
startTimeoutScheduled: boolean
}
// Events the session FSM reacts to. Transport-level concerns (ping/pong,
// ready/reconnecting state, watch restoration) are handled autonomously
// by the transport — the session FSM only sees lifecycle-significant events.
export type SessionEvent =
| { type: 'session.start' }
| { type: 'session.close' }
| { type: 'session.abort'; reason?: unknown }
| { type: 'session.destroy'; reason?: unknown }
| { type: 'session.transport.started'; sessionId: bigint }
| { type: 'session.transport.disconnected'; reason?: unknown }
| { type: 'session.transport.stopped'; sessionId?: bigint }
| { type: 'session.transport.failure'; status: StatusIds_StatusCode; issues?: unknown[] }
| { type: 'session.transport.fatal'; error: unknown }
| { type: 'session.timer.start_timeout' }
| { type: 'session.timer.retry_backoff_elapsed' }
| { type: 'session.timer.recovery_window_expired' }
// Effects the session FSM emits. The transport is autonomous — the session
// FSM only issues high-level lifecycle commands: connect, stop, close.
export type SessionEffect =
| { type: 'session.effect.transport.connect' }
| { type: 'session.effect.transport.stop' }
| { type: 'session.effect.transport.close' }
| { type: 'session.effect.timer.schedule_start_timeout' }
| { type: 'session.effect.timer.schedule_retry_backoff' }
| { type: 'session.effect.timer.schedule_recovery_window' }
| { type: 'session.effect.timer.clear_start_timeout' }
| { type: 'session.effect.timer.clear_retry_backoff' }
| { type: 'session.effect.timer.clear_recovery_window' }
| { type: 'session.effect.runtime.mark_closed'; reason: unknown }
| { type: 'session.effect.runtime.mark_expired'; reason: unknown }
export type SessionOutput =
| { type: 'session.error'; error: unknown }
| { type: 'session.ready'; sessionId: bigint }
| { type: 'session.closed'; reason?: unknown }
| { type: 'session.expired'; sessionId?: bigint; reason?: unknown }
export let createSessionCtx = function createSessionCtx(): SessionCtx {
return {
sessionId: null,
hasEverConnected: false,
recoveryScheduled: false,
retryScheduled: false,
startTimeoutScheduled: false,
}
}
export let isTerminalSessionStatus = function isTerminalSessionStatus(
status: StatusIds_StatusCode
): boolean {
return (
status === StatusIds_StatusCode.SESSION_EXPIRED ||
status === StatusIds_StatusCode.BAD_SESSION
)
}
export let isSessionLiveState = function isSessionLiveState(state: SessionState): boolean {
return state === 'connecting' || state === 'ready' || state === 'reconnecting'
}
export let isSessionTerminalState = function isSessionTerminalState(state: SessionState): boolean {
return state === 'closed' || state === 'expired'
}
export let toSessionFailureReason = function toSessionFailureReason(
status: StatusIds_StatusCode,
issues?: unknown[]
): YDBError {
return new YDBError(status, (issues || []) as any[])
}
export let clearReconnectScheduling = function clearReconnectScheduling(ctx: SessionCtx): void {
ctx.retryScheduled = false
ctx.recoveryScheduled = false
}
export let clearAllScheduling = function clearAllScheduling(context: SessionCtx): void {
context.retryScheduled = false
context.recoveryScheduled = false
context.startTimeoutScheduled = false
}
export let sessionTransition = function sessionTransition(
ctx: SessionCtx,
event: SessionEvent,
runtime: TransitionRuntime<SessionState, SessionEvent, SessionOutput>
): TransitionResult<SessionState, SessionEffect> | void {
let state = runtime.state
// Global handlers — apply regardless of current state.
if (state !== 'closed' && event.type === 'session.destroy') {
clearAllScheduling(ctx)
return {
state: 'closed',
effects: [
{
type: 'session.effect.runtime.mark_closed',
reason: event.reason ?? new SessionClosedError('Session destroyed'),
},
{ type: 'session.effect.transport.close' },
{ type: 'session.effect.timer.clear_start_timeout' },
{ type: 'session.effect.timer.clear_retry_backoff' },
{ type: 'session.effect.timer.clear_recovery_window' },
],
}
}
if (state !== 'closed' && state !== 'expired' && event.type === 'session.transport.fatal') {
clearAllScheduling(ctx)
return {
state: 'expired',
effects: [
{ type: 'session.effect.runtime.mark_expired', reason: event.error },
{ type: 'session.effect.transport.close' },
{ type: 'session.effect.timer.clear_start_timeout' },
{ type: 'session.effect.timer.clear_retry_backoff' },
{ type: 'session.effect.timer.clear_recovery_window' },
],
}
}
// State-specific handlers.
switch (state) {
case 'idle': {
if (event.type === 'session.start') {
ctx.startTimeoutScheduled = true
return {
state: 'connecting',
effects: [
{ type: 'session.effect.transport.connect' },
{ type: 'session.effect.timer.schedule_start_timeout' },
],
}
}
Eif (event.type === 'session.close' || event.type === 'session.abort') {
clearAllScheduling(ctx)
let reason =
event.type === 'session.abort'
? (event.reason ??
new SessionClosedError('Session was closed before start'))
: new SessionClosedError('Session was closed before start')
return {
state: 'closed',
effects: [
{
type: 'session.effect.runtime.mark_closed',
reason,
},
],
}
}
return
}
case 'connecting': {
if (event.type === 'session.transport.started') {
ctx.sessionId = event.sessionId
ctx.hasEverConnected = true
ctx.startTimeoutScheduled = false
clearReconnectScheduling(ctx)
return {
state: 'ready',
effects: [
{ type: 'session.effect.timer.clear_start_timeout' },
{ type: 'session.effect.timer.clear_retry_backoff' },
{ type: 'session.effect.timer.clear_recovery_window' },
],
}
}
Iif (
event.type === 'session.transport.failure' &&
isTerminalSessionStatus(event.status)
) {
clearAllScheduling(ctx)
return {
state: 'expired',
effects: [
{ type: 'session.effect.timer.clear_start_timeout' },
{ type: 'session.effect.timer.clear_retry_backoff' },
{ type: 'session.effect.timer.clear_recovery_window' },
{
type: 'session.effect.runtime.mark_expired',
reason: toSessionFailureReason(event.status, event.issues),
},
],
}
}
Eif (
event.type === 'session.timer.start_timeout' ||
event.type === 'session.transport.disconnected'
) {
ctx.startTimeoutScheduled = false
Eif (!ctx.retryScheduled) {
ctx.retryScheduled = true
}
Eif (!ctx.recoveryScheduled) {
ctx.recoveryScheduled = true
}
return {
state: 'reconnecting',
effects: [
{ type: 'session.effect.timer.clear_start_timeout' },
{ type: 'session.effect.timer.schedule_retry_backoff' },
{ type: 'session.effect.timer.schedule_recovery_window' },
],
}
}
if (event.type === 'session.close' || event.type === 'session.abort') {
clearAllScheduling(ctx)
return {
state: 'closing',
effects: [
{ type: 'session.effect.transport.stop' },
{ type: 'session.effect.timer.clear_start_timeout' },
{ type: 'session.effect.timer.clear_retry_backoff' },
{ type: 'session.effect.timer.clear_recovery_window' },
],
}
}
return
}
case 'ready': {
if (event.type === 'session.transport.disconnected') {
Eif (!ctx.retryScheduled) {
ctx.retryScheduled = true
}
Eif (!ctx.recoveryScheduled) {
ctx.recoveryScheduled = true
}
return {
state: 'reconnecting',
effects: [
{ type: 'session.effect.timer.schedule_retry_backoff' },
{ type: 'session.effect.timer.schedule_recovery_window' },
],
}
}
if (
event.type === 'session.transport.failure' &&
isTerminalSessionStatus(event.status)
) {
clearAllScheduling(ctx)
return {
state: 'expired',
effects: [
{ type: 'session.effect.timer.clear_start_timeout' },
{ type: 'session.effect.timer.clear_retry_backoff' },
{ type: 'session.effect.timer.clear_recovery_window' },
{
type: 'session.effect.runtime.mark_expired',
reason: toSessionFailureReason(event.status, event.issues),
},
],
}
}
Eif (event.type === 'session.close' || event.type === 'session.abort') {
clearAllScheduling(ctx)
return {
state: 'closing',
effects: [
{ type: 'session.effect.transport.stop' },
{ type: 'session.effect.timer.clear_start_timeout' },
{ type: 'session.effect.timer.clear_retry_backoff' },
{ type: 'session.effect.timer.clear_recovery_window' },
],
}
}
return
}
case 'reconnecting': {
if (event.type === 'session.transport.started') {
ctx.sessionId = event.sessionId
ctx.hasEverConnected = true
ctx.startTimeoutScheduled = false
clearReconnectScheduling(ctx)
return {
state: 'ready',
effects: [
{ type: 'session.effect.timer.clear_start_timeout' },
{ type: 'session.effect.timer.clear_retry_backoff' },
{ type: 'session.effect.timer.clear_recovery_window' },
],
}
}
if (event.type === 'session.timer.retry_backoff_elapsed') {
ctx.retryScheduled = false
ctx.startTimeoutScheduled = true
return {
state: 'connecting',
effects: [
{ type: 'session.effect.transport.connect' },
{ type: 'session.effect.timer.schedule_start_timeout' },
],
}
}
Eif (event.type === 'session.timer.recovery_window_expired') {
ctx.recoveryScheduled = false
ctx.retryScheduled = false
ctx.startTimeoutScheduled = false
return {
state: 'expired',
effects: [
{ type: 'session.effect.timer.clear_start_timeout' },
{ type: 'session.effect.timer.clear_retry_backoff' },
{ type: 'session.effect.timer.clear_recovery_window' },
{
type: 'session.effect.runtime.mark_expired',
reason: new SessionExpiredError('Recovery window expired'),
},
],
}
}
if (
event.type === 'session.transport.failure' &&
isTerminalSessionStatus(event.status)
) {
clearAllScheduling(ctx)
return {
state: 'expired',
effects: [
{ type: 'session.effect.timer.clear_start_timeout' },
{ type: 'session.effect.timer.clear_retry_backoff' },
{ type: 'session.effect.timer.clear_recovery_window' },
{
type: 'session.effect.runtime.mark_expired',
reason: toSessionFailureReason(event.status, event.issues),
},
],
}
}
if (event.type === 'session.close' || event.type === 'session.abort') {
clearAllScheduling(ctx)
return {
state: 'closing',
effects: [
{ type: 'session.effect.transport.stop' },
{ type: 'session.effect.timer.clear_start_timeout' },
{ type: 'session.effect.timer.clear_retry_backoff' },
{ type: 'session.effect.timer.clear_recovery_window' },
],
}
}
return
}
case 'closing': {
if (
event.type === 'session.transport.stopped' ||
event.type === 'session.transport.disconnected'
) {
clearAllScheduling(ctx)
return {
state: 'closed',
effects: [
{
type: 'session.effect.runtime.mark_closed',
reason: new SessionClosedError(),
},
{ type: 'session.effect.transport.close' },
{ type: 'session.effect.timer.clear_start_timeout' },
{ type: 'session.effect.timer.clear_retry_backoff' },
{ type: 'session.effect.timer.clear_recovery_window' },
],
}
}
Iif (
event.type === 'session.transport.failure' &&
isTerminalSessionStatus(event.status)
) {
clearAllScheduling(ctx)
return {
state: 'expired',
effects: [
{
type: 'session.effect.runtime.mark_expired',
reason: toSessionFailureReason(event.status, event.issues),
},
{ type: 'session.effect.transport.close' },
{ type: 'session.effect.timer.clear_start_timeout' },
{ type: 'session.effect.timer.clear_retry_backoff' },
{ type: 'session.effect.timer.clear_recovery_window' },
],
}
}
return
}
case 'closed':
case 'expired':
return
default: {
let exhaustiveCheck: never = state
fail(`Unhandled session state: ${exhaustiveCheck}`)
}
}
}
// ── Transport FSM ─────────────────────────────────────────────────────────────
export type TransportState =
| 'idle'
| 'connecting'
| 'ready'
| 'disconnected'
| 'stopping'
| 'closed'
export type TransportCtx = {
wasEverReady: boolean
}
export type TransportEvent =
| { type: 'transport.connect' }
| { type: 'transport.stop' }
| { type: 'transport.close' }
| { type: 'transport.destroy'; reason?: unknown }
| { type: 'transport.stream.message'; response: SessionResponse }
| { type: 'transport.stream.ended' }
| { type: 'transport.stream.error'; error: unknown }
export type TransportEffect =
| { type: 'transport.effect.open_stream' }
| { type: 'transport.effect.close_stream' }
| { type: 'transport.effect.send_pong'; opaque: bigint }
| { type: 'transport.effect.send_stop' }
| { type: 'transport.effect.mark_ready'; sessionId: bigint }
| { type: 'transport.effect.mark_disconnected' }
| { type: 'transport.effect.notify_watches' }
| { type: 'transport.effect.finalize'; reason: unknown }
// Events the transport emits to the parent session FSM via AsyncIterable output.
export type TransportOutput =
| { type: 'transport.stream.started'; sessionId: bigint }
| { type: 'transport.stream.disconnected'; reason?: unknown }
| { type: 'transport.stream.stopped'; sessionId?: bigint }
| { type: 'transport.stream.failure'; status: StatusIds_StatusCode; issues?: unknown[] }
| { type: 'transport.stream.fatal'; error: unknown }
export interface StreamOpenParams {
path: string
sessionId: bigint | null
description: string
recoveryWindow: number
}
export type CoordinationSessionClient = {
session(
request: AsyncIterable<StreamEnvelope>,
options?: { signal?: AbortSignal }
): AsyncIterable<SessionResponse>
}
export type StreamEnvelope = {
request: {
case: string
value: unknown
}
}
export type WatchChange = {
dataChanged: boolean
ownersChanged: boolean
}
// ── Message classification ────────────────────────────────────────────────────
type ClassifiedMessage =
| { kind: 'ping'; opaque: bigint }
| { kind: 'started'; sessionId: bigint }
| { kind: 'stopped'; sessionId?: bigint }
| { kind: 'failure'; status: StatusIds_StatusCode; issues?: unknown[] }
| { kind: 'response'; reqId: bigint; response: SessionResponse }
| { kind: 'watch'; reqId: bigint; change: WatchChange }
export let classifyMessage = function classifyMessage(
response: SessionResponse
): ClassifiedMessage | null {
if (response.response.case === 'describeSemaphoreChanged') {
let value = response.response.value
return {
kind: 'watch',
reqId: value.reqId,
change: { dataChanged: value.dataChanged, ownersChanged: value.ownersChanged },
}
}
let reqId = extractReqId(response)
if (reqId !== null) {
return { kind: 'response', reqId, response }
}
if (response.response.case === 'ping') {
return { kind: 'ping', opaque: response.response.value.opaque }
}
if (response.response.case === 'sessionStarted') {
return { kind: 'started', sessionId: response.response.value.sessionId }
}
Eif (response.response.case === 'sessionStopped') {
return { kind: 'stopped', sessionId: response.response.value.sessionId }
}
if (response.response.case === 'failure') {
return {
kind: 'failure',
status: response.response.value.status as StatusIds_StatusCode,
issues: response.response.value.issues,
}
}
return null
}
export let extractReqId = function extractReqId(response: SessionResponse): bigint | null {
switch (response.response.case) {
case 'acquireSemaphorePending':
case 'acquireSemaphoreResult':
case 'releaseSemaphoreResult':
case 'createSemaphoreResult':
case 'updateSemaphoreResult':
case 'deleteSemaphoreResult':
case 'describeSemaphoreResult':
return response.response.value.reqId
default:
return null
}
}
export let isAbortError = function isAbortError(error: unknown): boolean {
return error instanceof Error && error.name === 'AbortError'
}
// ── Transport FSM transition ──────────────────────────────────────────────────
export let transportTransition = function transportTransition(
ctx: TransportCtx,
event: TransportEvent,
runtime: TransitionRuntime<TransportState, TransportEvent, TransportOutput>
): TransitionResult<TransportState, TransportEffect> | void {
let state = runtime.state
// Global: destroy from any non-closed state.
Iif (state !== 'closed' && event.type === 'transport.destroy') {
return {
state: 'closed',
effects: [
{ type: 'transport.effect.close_stream' },
{
type: 'transport.effect.finalize',
reason: event.reason ?? new Error('Transport destroyed'),
},
],
}
}
switch (state) {
case 'idle': {
if (event.type === 'transport.connect') {
return {
state: 'connecting',
effects: [{ type: 'transport.effect.open_stream' }],
}
}
Eif (event.type === 'transport.close') {
return {
state: 'closed',
effects: [
{
type: 'transport.effect.finalize',
reason: new Error('Transport closed before connecting'),
},
],
}
}
return
}
case 'connecting': {
if (event.type === 'transport.stream.message') {
let msg = classifyMessage(event.response)
Iif (!msg) {
return
}
Iif (msg.kind === 'ping') {
return { effects: [{ type: 'transport.effect.send_pong', opaque: msg.opaque }] }
}
Eif (msg.kind === 'started') {
let wasReconnect = ctx.wasEverReady
ctx.wasEverReady = true
return {
state: 'ready',
effects: [
{ type: 'transport.effect.mark_ready', sessionId: msg.sessionId },
...(wasReconnect
? [
{
type: 'transport.effect.notify_watches',
} satisfies TransportEffect,
]
: []),
],
}
}
if (msg.kind === 'failure') {
let output: TransportOutput = {
type: 'transport.stream.failure',
status: msg.status,
}
if (msg.issues) {
output = { ...output, issues: msg.issues }
}
runtime.emit(output)
return
}
// Responses and watches can arrive while connecting (unlikely but safe).
if (msg.kind === 'response' || msg.kind === 'watch') {
return
}
return
}
Iif (
event.type === 'transport.stream.ended' ||
event.type === 'transport.stream.error'
) {
return {
state: 'disconnected',
effects: [
{ type: 'transport.effect.close_stream' },
{ type: 'transport.effect.mark_disconnected' },
],
}
}
Eif (event.type === 'transport.stop' || event.type === 'transport.close') {
return {
state: 'closed',
effects: [
{ type: 'transport.effect.close_stream' },
{
type: 'transport.effect.finalize',
reason: new Error('Transport closed'),
},
],
}
}
return
}
case 'ready': {
if (event.type === 'transport.stream.message') {
let msg = classifyMessage(event.response)
Iif (!msg) {
return
}
Eif (msg.kind === 'ping') {
return { effects: [{ type: 'transport.effect.send_pong', opaque: msg.opaque }] }
}
if (msg.kind === 'failure') {
let output: TransportOutput = {
type: 'transport.stream.failure',
status: msg.status,
}
if (msg.issues) {
output = { ...output, issues: msg.issues }
}
runtime.emit(output)
return
}
// response and watch are handled inline by effects (not FSM concern)
return
}
if (
event.type === 'transport.stream.ended' ||
event.type === 'transport.stream.error'
) {
return {
state: 'disconnected',
effects: [
{ type: 'transport.effect.close_stream' },
{ type: 'transport.effect.mark_disconnected' },
],
}
}
if (event.type === 'transport.stop') {
return {
state: 'stopping',
effects: [{ type: 'transport.effect.send_stop' }],
}
}
Eif (event.type === 'transport.close') {
return {
state: 'closed',
effects: [
{ type: 'transport.effect.close_stream' },
{
type: 'transport.effect.finalize',
reason: new Error('Transport closed'),
},
],
}
}
if (event.type === 'transport.connect') {
// Reconnect request while already ready — re-open stream.
return {
state: 'connecting',
effects: [
{ type: 'transport.effect.mark_disconnected' },
{ type: 'transport.effect.open_stream' },
],
}
}
return
}
case 'disconnected': {
Eif (event.type === 'transport.connect') {
return {
state: 'connecting',
effects: [{ type: 'transport.effect.open_stream' }],
}
}
if (event.type === 'transport.stop' || event.type === 'transport.close') {
return {
state: 'closed',
effects: [
{
type: 'transport.effect.finalize',
reason: new Error('Transport closed'),
},
],
}
}
return
}
case 'stopping': {
if (event.type === 'transport.stream.message') {
let msg = classifyMessage(event.response)
Iif (!msg) {
return
}
if (msg.kind === 'ping') {
return { effects: [{ type: 'transport.effect.send_pong', opaque: msg.opaque }] }
}
// Server confirmed graceful stop. Emit the event so the parent
// session FSM can transition to closed and call transport.close()
// when it's ready. The transport stays in 'stopping' — finalization
// happens when the parent explicitly closes.
Eif (msg.kind === 'stopped') {
let stoppedOutput: TransportOutput = { type: 'transport.stream.stopped' }
if (msg.sessionId !== undefined) {
stoppedOutput = { ...stoppedOutput, sessionId: msg.sessionId }
}
runtime.emit(stoppedOutput)
return { effects: [{ type: 'transport.effect.mark_disconnected' }] }
}
if (msg.kind === 'failure') {
let output: TransportOutput = {
type: 'transport.stream.failure',
status: msg.status,
}
if (msg.issues) {
output = { ...output, issues: msg.issues }
}
runtime.emit(output)
return
}
return
}
// Stream dropped while waiting for graceful stop — treat the same
// as stopped: emit disconnected so the parent can react.
if (
event.type === 'transport.stream.ended' ||
event.type === 'transport.stream.error'
) {
runtime.emit({ type: 'transport.stream.disconnected' })
return { effects: [{ type: 'transport.effect.mark_disconnected' }] }
}
// Parent decided to force-close while waiting for graceful stop.
Eif (event.type === 'transport.close') {
return {
state: 'closed',
effects: [
{ type: 'transport.effect.close_stream' },
{
type: 'transport.effect.finalize',
reason: new Error('Transport closed'),
},
],
}
}
return
}
case 'closed':
return
default: {
let exhaustiveCheck: never = state
throw new Error(`Unhandled transport state: ${exhaustiveCheck}`)
}
}
}
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