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import {
Codec,
StreamWriteMessage_WriteRequestSchema,
TransactionIdentitySchema,
} from '@ydbjs/api/topic'
import type { Driver } from '@ydbjs/core'
import { loggers } from '@ydbjs/debug'
import { type MachineRuntime, createMachineRuntime } from '@ydbjs/fsm'
import { type InitParams, WriterTransport } from './transport.js'
import type { TransportOutput } from './transport-state.js'
import type { TopicWriterOptions } from './types.js'
import {
type GlobalTimerName,
MAX_BATCH_BYTES,
type WriterCtx,
type WriterEffect,
type WriterEvent,
type WriterOutput,
type WriterState,
createWriterCtx,
writerTransition,
} from './writer-state.js'
// Watchdog for a connect that never produces an init response.
let DEFAULT_START_TIMEOUT_MS = 30_000
// Single source of the option defaults — the facade imports these for its
// diagnostics config snapshot, so the published effective config cannot drift.
export const DEFAULT_MAX_BUFFER_BYTES = 256n * 1024n * 1024n
export const DEFAULT_MAX_INFLIGHT_COUNT = 1000
export const DEFAULT_FLUSH_INTERVAL_MS = 1000
export const DEFAULT_UPDATE_TOKEN_INTERVAL_MS = 60_000
export const DEFAULT_GRACEFUL_SHUTDOWN_TIMEOUT_MS = 30_000
export const DEFAULT_RECOVERY_WINDOW_MS = Infinity
let BACKOFF_BASE_MS = 50
let BACKOFF_MAX_MS = 30_000
// I/O handles and config — visible to effect handlers only, never to the transition.
type WriterEnv = {
// I/O
transport: WriterTransport
codec: number
txIdentity?: { id: string; session: string }
// timer durations (ms)
startTimeoutMs: number
flushIntervalMs: number
updateTokenIntervalMs: number
gracefulShutdownTimeoutMs: number
// lifecycle
ac: AbortController
closedDeferred: PromiseWithResolvers<void>
isFinalized: boolean
// Keyed by GlobalTimerName — string-keyed like the reader, whose keys also
// carry a partition suffix (the writer has no partition timers).
timers: Map<string, ReturnType<typeof setTimeout>>
}
type FullCtx = WriterCtx & WriterEnv
export type WriterRuntime = {
machine: MachineRuntime<WriterState, WriterCtx, WriterEvent, WriterOutput>
}
let timerEvent = function timerEvent(which: GlobalTimerName): WriterEvent {
switch (which) {
case 'start_timeout':
return { type: 'writer.timer.start_timeout' }
case 'retry_backoff':
return { type: 'writer.timer.retry_backoff' }
case 'recovery_window':
return { type: 'writer.timer.recovery_window' }
case 'flush_tick':
return { type: 'writer.timer.flush_tick' }
case 'update_token':
return { type: 'writer.timer.update_token' }
case 'graceful_timeout':
return { type: 'writer.timer.graceful_timeout' }
}
}
// Equal-jitter exponential backoff: half fixed, half random in [d/2, d].
let backoffDelay = function backoffDelay(attempts: number): number {
let capped = Math.min(BACKOFF_BASE_MS * 2 ** attempts, BACKOFF_MAX_MS)
return Math.round(capped / 2 + Math.random() * (capped / 2))
}
let delayFor = function delayFor(ctx: FullCtx, which: GlobalTimerName): number {
switch (which) {
case 'start_timeout':
return ctx.startTimeoutMs
case 'retry_backoff':
return backoffDelay(ctx.attempts)
case 'recovery_window':
return ctx.recoveryWindowMs
case 'flush_tick':
return ctx.flushIntervalMs
case 'update_token':
return ctx.updateTokenIntervalMs
case 'graceful_timeout':
return ctx.gracefulShutdownTimeoutMs
}
}
let clearTimerByKey = function clearTimerByKey(ctx: FullCtx, key: string): void {
let handle = ctx.timers.get(key)
if (handle) {
clearTimeout(handle)
ctx.timers.delete(key)
}
}
// `dbg` carries low-frequency lifecycle (connect, start); the per-event / per-batch
// trace goes to `evdbg` so enabling `ydb:topic:writer` doesn't flood with the
// per-message send/transition noise — opt into it with `ydb:topic:writer:event`.
let dbg = loggers.topic.extend('writer')
let evdbg = dbg.extend('event')
let mapTransportOutput = function mapTransportOutput(output: TransportOutput): WriterEvent | null {
evdbg.log('transport → writer: %s', output.type)
switch (output.type) {
case 'transport.stream.init_response':
return {
type: 'writer.stream.init_response',
sessionId: output.sessionId,
lastSeqNo: output.lastSeqNo,
...(output.partitionId !== undefined && { partitionId: output.partitionId }),
...(output.supportedCodecs !== undefined && {
supportedCodecs: output.supportedCodecs,
}),
}
case 'transport.stream.write_response':
return { type: 'writer.stream.write_response', acks: output.acks }
case 'transport.stream.token_response':
return { type: 'writer.stream.token_response' }
case 'transport.stream.disconnected':
return {
type: 'writer.stream.disconnected',
...('error' in output ? { error: output.error } : {}),
}
default:
return null
}
}
// Builds the writer FSM and binds its effects to real I/O: transport connect/send,
// timers with equal-jitter backoff, and transport-output → writer-event mapping.
// The returned machine is the only handle the facade drives; every side effect
// (sockets, timers, token refresh) fires from the effect handlers wired here.
export function createWriterRuntime(driver: Driver, options: TopicWriterOptions): WriterRuntime {
let initParams: InitParams = {
path: options.topic,
producerId: options.producer!,
...(options.partitionId !== undefined && { partitionId: options.partitionId }),
...(options.messageGroupId !== undefined && { messageGroupId: options.messageGroupId }),
}
let transport = new WriterTransport(driver, initParams)
let env: WriterEnv = {
// I/O
transport,
codec: options.codec?.codec ?? Codec.RAW,
...(options.tx && {
txIdentity: { id: options.tx.transactionId, session: options.tx.sessionId },
}),
// timer durations (ms)
startTimeoutMs: DEFAULT_START_TIMEOUT_MS,
flushIntervalMs: options.flushIntervalMs ?? DEFAULT_FLUSH_INTERVAL_MS,
updateTokenIntervalMs: options.updateTokenIntervalMs ?? DEFAULT_UPDATE_TOKEN_INTERVAL_MS,
gracefulShutdownTimeoutMs:
options.gracefulShutdownTimeoutMs ?? DEFAULT_GRACEFUL_SHUTDOWN_TIMEOUT_MS,
// lifecycle
ac: new AbortController(),
closedDeferred: Promise.withResolvers<void>(),
isFinalized: false,
timers: new Map(),
}
let ctx = createWriterCtx(
{
maxInflightCount: options.maxInflightCount ?? DEFAULT_MAX_INFLIGHT_COUNT,
maxBatchBytes: MAX_BATCH_BYTES,
},
{
retryOnSchemeError: options.retryOnSchemeError ?? false,
recoveryWindowMs: options.recoveryWindowMs ?? DEFAULT_RECOVERY_WINDOW_MS,
codec: options.codec?.codec ?? Codec.RAW,
}
)
let machine = createMachineRuntime<
WriterState,
WriterCtx,
WriterEnv,
WriterEvent,
WriterEffect,
WriterOutput
>({
initialState: 'idle',
ctx,
env,
// Wrap the pure transition to log each event and state change without
// putting side effects in the transition itself.
transition: (fullCtx, event, runtime) => {
let result = writerTransition(fullCtx, event, runtime)
Iif (evdbg.enabled) {
evdbg.log('%s: %s → %s', event.type, runtime.state, result?.state ?? runtime.state)
}
return result
},
effects: {
'writer.effect.transport.connect': (fullCtx, effect) => {
dbg.log('connect (getLastSeqNo=%s)', effect.getLastSeqNo)
fullCtx.transport.connect(effect.getLastSeqNo)
},
'writer.effect.transport.close': (fullCtx) => {
fullCtx.transport.close()
},
'writer.effect.send.write_request': (fullCtx, effect) => {
evdbg.log(
'send write_request: %d messages (seqNo %s..%s)',
effect.messages.length,
effect.messages[0]?.seqNo,
effect.messages[effect.messages.length - 1]?.seqNo
)
let request = create(StreamWriteMessage_WriteRequestSchema, {
codec: fullCtx.codec,
messages: effect.messages,
...(fullCtx.txIdentity && {
tx: create(TransactionIdentitySchema, fullCtx.txIdentity),
}),
})
fullCtx.transport.sendBatch(request)
},
'writer.effect.send.update_token': (fullCtx) => {
void fullCtx.transport.sendUpdateToken().catch(() => {
// Token refresh failures surface as a stream error on the next write.
})
},
'writer.effect.timer.schedule': (fullCtx, effect, runtime) => {
let which = effect.which
// The recovery window is armed once per reconnect saga.
Iif (which === 'recovery_window' && fullCtx.timers.has('recovery_window')) {
return
}
clearTimerByKey(fullCtx, which)
let repeating = which === 'flush_tick' || which === 'update_token'
let delay = delayFor(fullCtx, which)
let event = timerEvent(which)
let handle = repeating
? setInterval(() => runtime.dispatch(event), delay)
: setTimeout(() => {
fullCtx.timers.delete(which)
runtime.dispatch(event)
}, delay)
handle.unref?.()
fullCtx.timers.set(which, handle)
},
'writer.effect.timer.clear': (fullCtx, effect) => {
clearTimerByKey(fullCtx, effect.which)
},
'writer.effect.finalize': (fullCtx, effect) => {
Iif (fullCtx.isFinalized) {
return
}
fullCtx.isFinalized = true
for (let handle of fullCtx.timers.values()) {
clearTimeout(handle)
}
fullCtx.timers.clear()
fullCtx.transport.destroy(effect.reason)
fullCtx.ac.abort(effect.reason)
fullCtx.closedDeferred.resolve()
},
},
})
// Route transport lifecycle events into the writer FSM.
machine.ingest(transport.events, mapTransportOutput)
dbg.log('starting writer on %s (producer=%s)', options.topic, options.producer)
machine.dispatch({ type: 'writer.start' })
return { machine }
}
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