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import { CoordinationServiceDefinition } from '@ydbjs/api/coordination'
import type { Driver } from '@ydbjs/core'
import { loggers } from '@ydbjs/debug'
import { type Deferred, createDeferred } from './session-registry.js'
import {
type CoordinationSessionClient,
SessionTransport,
type TransportOutput,
} from './session-transport.js'
import {
type SessionCtx,
type SessionEffect,
type SessionEvent,
type SessionOutput,
type SessionState,
createSessionCtx,
sessionTransition,
} from './session-state.js'
import { createMachineRuntime } from '@ydbjs/fsm'
let dbg = loggers.coordination.extend('session')
export type SessionStatus = SessionState
export interface SessionRuntime {
readonly transport: SessionTransport
get sessionId(): bigint | null
get status(): SessionStatus
get signal(): AbortSignal
close(signal?: AbortSignal): Promise<void>
destroy(reason?: unknown): void
}
// Runtime I/O handles passed as the env (RC) to the FSM.
// The transition function never sees these — only effect handlers do.
type SessionEnv = {
path: string
description: string
startTimeout: number
retryBackoff: number
recoveryWindow: number
ac: AbortController
transport: SessionTransport
isFinalized: boolean
closedDeferred: Deferred<void>
timerStartTimeout: ReturnType<typeof setTimeout> | null
timerRetryBackoff: ReturnType<typeof setTimeout> | null
timerRecoveryWindow: ReturnType<typeof setTimeout> | null
}
type FullCtx = SessionCtx & SessionEnv
let clearTimer = function clearTimer(timer: ReturnType<typeof setTimeout> | null): null {
if (timer) {
clearTimeout(timer)
}
return null
}
let clearAllTimers = function clearAllTimers(ctx: FullCtx): void {
ctx.timerStartTimeout = clearTimer(ctx.timerStartTimeout)
ctx.timerRetryBackoff = clearTimer(ctx.timerRetryBackoff)
ctx.timerRecoveryWindow = clearTimer(ctx.timerRecoveryWindow)
}
let finalize = function finalize(ctx: FullCtx, reason: unknown, kind: 'closed' | 'expired'): void {
Iif (ctx.isFinalized) {
return
}
ctx.isFinalized = true
ctx.closedDeferred.resolve()
ctx.ac.abort(reason)
ctx.transport.destroy(reason)
dbg.log('session finalized as %s: %O', kind, reason)
}
// Maps a TransportOutput event to a SessionEvent for the session FSM.
let mapTransportOutput = function mapTransportOutput(output: TransportOutput): SessionEvent | null {
switch (output.type) {
case 'transport.stream.started':
return { type: 'session.transport.started', sessionId: output.sessionId }
case 'transport.stream.disconnected':
return {
type: 'session.transport.disconnected',
...('reason' in output ? { reason: output.reason } : {}),
}
case 'transport.stream.stopped':
return {
type: 'session.transport.stopped',
...('sessionId' in output ? { sessionId: output.sessionId } : {}),
}
case 'transport.stream.failure': {
let event: SessionEvent = { type: 'session.transport.failure', status: output.status }
if (output.issues) {
event = { ...event, issues: output.issues }
}
return event
}
case 'transport.stream.fatal':
return { type: 'session.transport.fatal', error: output.error }
default:
return null
}
}
export interface CreateSessionOptions {
path: string
description?: string
recoveryWindow?: number
startTimeout?: number
retryBackoff?: number
}
export function createRuntime(
driver: Driver,
options: CreateSessionOptions,
outerSignal?: AbortSignal
): SessionRuntime {
let client = driver.createClient(CoordinationServiceDefinition) as CoordinationSessionClient
let transport = new SessionTransport(client)
let path = options.path
let description = options.description ?? ''
let retryBackoff = options.retryBackoff ?? 30
let startTimeout = options.startTimeout ?? 3_000
let recoveryWindow = options.recoveryWindow ?? 30_000
let machineRuntime = createMachineRuntime<
SessionState,
SessionCtx,
SessionEnv,
SessionEvent,
SessionEffect,
SessionOutput
>({
initialState: 'idle',
ctx: createSessionCtx(),
env: {
path,
description,
startTimeout,
retryBackoff,
recoveryWindow,
ac: new AbortController(),
transport,
isFinalized: false,
closedDeferred: createDeferred<void>(),
timerStartTimeout: null,
timerRetryBackoff: null,
timerRecoveryWindow: null,
},
transition: sessionTransition,
effects: {
'session.effect.transport.connect': (ctx) => {
dbg.log(
'connecting transport to %s (sessionId=%s)',
ctx.path,
ctx.sessionId ?? 'new'
)
ctx.transport.connect({
path: ctx.path,
sessionId: ctx.sessionId,
recoveryWindow: ctx.recoveryWindow,
description: ctx.description,
})
},
'session.effect.transport.stop': (ctx) => {
dbg.log('gracefully stopping session %s on %s', ctx.sessionId, ctx.path)
ctx.transport.stop()
},
'session.effect.transport.close': async (ctx) => {
dbg.log('force closing transport on %s', ctx.path)
ctx.transport.close()
},
'session.effect.timer.schedule_start_timeout': (ctx, _effect, runtime) => {
dbg.log(
'waiting up to %dms for server to accept session on %s',
ctx.startTimeout,
ctx.path
)
ctx.timerStartTimeout = clearTimer(ctx.timerStartTimeout)
ctx.timerStartTimeout = setTimeout(() => {
ctx.timerStartTimeout = null
runtime.dispatch({ type: 'session.timer.start_timeout' })
}, ctx.startTimeout)
},
'session.effect.timer.schedule_retry_backoff': (ctx, _effect, runtime) => {
dbg.log('disconnected from %s, retrying in %dms', ctx.path, ctx.retryBackoff)
ctx.timerRetryBackoff = clearTimer(ctx.timerRetryBackoff)
ctx.timerRetryBackoff = setTimeout(() => {
ctx.timerRetryBackoff = null
runtime.dispatch({ type: 'session.timer.retry_backoff_elapsed' })
}, ctx.retryBackoff)
},
'session.effect.timer.schedule_recovery_window': (ctx, _effect, runtime) => {
Iif (ctx.timerRecoveryWindow) {
return
}
dbg.log(
'recovery window started (%dms) — session expires if not reconnected on %s',
ctx.recoveryWindow,
ctx.path
)
ctx.timerRecoveryWindow = setTimeout(() => {
ctx.timerRecoveryWindow = null
runtime.dispatch({ type: 'session.timer.recovery_window_expired' })
}, ctx.recoveryWindow)
},
'session.effect.timer.clear_start_timeout': (ctx) => {
ctx.timerStartTimeout = clearTimer(ctx.timerStartTimeout)
},
'session.effect.timer.clear_retry_backoff': (ctx) => {
ctx.timerRetryBackoff = clearTimer(ctx.timerRetryBackoff)
},
'session.effect.timer.clear_recovery_window': (ctx) => {
ctx.timerRecoveryWindow = clearTimer(ctx.timerRecoveryWindow)
},
'session.effect.runtime.mark_closed': async (ctx, effect) => {
dbg.log('session closed on %s', ctx.path)
clearAllTimers(ctx)
finalize(ctx, effect.reason, 'closed')
},
'session.effect.runtime.mark_expired': async (ctx, effect) => {
dbg.log('session expired on %s: %O', ctx.path, effect.reason)
clearAllTimers(ctx)
finalize(ctx, effect.reason, 'expired')
},
},
})
// Ingest transport events into the session FSM. The transport emits
// lifecycle-significant events (started, disconnected, stopped, failure,
// fatal) as an AsyncIterable — the session FSM maps and processes them.
machineRuntime.ingest(transport.events, mapTransportOutput)
if (outerSignal) {
if (outerSignal.aborted) {
dbg.log('not starting session on %s: signal already aborted', path)
machineRuntime.dispatch({ type: 'session.destroy', reason: outerSignal.reason })
} else {
outerSignal.addEventListener(
'abort',
() => {
dbg.log('outer signal aborted, stopping session on %s', path)
machineRuntime.dispatch({
type: 'session.destroy',
reason: outerSignal.reason,
})
},
{ once: true }
)
}
}
dbg.log('starting coordination session on %s (recoveryWindow=%dms)', path, recoveryWindow)
machineRuntime.dispatch({ type: 'session.start' })
let ctx = (): FullCtx => machineRuntime.ctx as unknown as FullCtx
return {
transport,
get sessionId(): bigint | null {
return machineRuntime.ctx.sessionId
},
get status(): SessionStatus {
return machineRuntime.state
},
get signal(): AbortSignal {
return (machineRuntime.ctx as unknown as FullCtx).ac.signal
},
async close(signal?: AbortSignal): Promise<void> {
dbg.log('closing session %s on %s', machineRuntime.ctx.sessionId, path)
machineRuntime.dispatch({ type: 'session.close' })
let fullCtx = ctx()
using combined = linkSignals(fullCtx.ac.signal, signal)
await abortable(combined.signal, fullCtx.closedDeferred.promise)
},
destroy(reason?: unknown): void {
dbg.log('destroying session %s on %s', machineRuntime.ctx.sessionId, path)
machineRuntime.dispatch({ type: 'session.destroy', reason })
},
}
}
|