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import { StatusIds_StatusCode } from '@ydbjs/api/operation'
import {
type StreamReadMessage_FromClient,
StreamReadMessage_FromClientSchema,
StreamReadMessage_InitRequestSchema,
type StreamReadMessage_InitRequest_TopicReadSettings,
TopicServiceDefinition,
UpdateTokenRequestSchema,
} from '@ydbjs/api/topic'
import type { Driver } from '@ydbjs/core'
import { loggers } from '@ydbjs/debug'
import { YDBError } from '@ydbjs/error'
import { type MachineRuntime, createMachineRuntime } from '@ydbjs/fsm'
import { AsyncPriorityQueue } from '@ydbjs/fsm/queue'
import {
type TransportCtx,
type TransportEffect,
type TransportEvent,
type TransportOutput,
type TransportState,
transportTransition,
} from './transport-state.js'
let dbg = loggers.topic.extend('reader').extend('transport')
// Priorities keep the init handshake ahead of everything and token refreshes
// ahead of the read/commit backlog on the single outgoing stream.
let PRIORITY_INIT = 100
let PRIORITY_TOKEN = 10
let PRIORITY_DEFAULT = 0
// Partition-session control frames (start/stop responses) must overtake queued
// data-plane frames (commits at PRIORITY_DEFAULT): a reconciled commit may never
// reach the wire before the start response that makes its session live.
export const PRIORITY_CONTROL = 10
export type InitParams = {
consumer: string
topicsReadSettings: StreamReadMessage_InitRequest_TopicReadSettings[]
readerName?: string
autoPartitioningSupport?: boolean
}
// Owns one streamRead gRPC stream at a time. Reconnecting the underlying stream
// is transparent to the reader FSM: each open pushes a fresh init request and the
// ingest task forwards server messages (verbatim, except the init handshake) as
// transport outputs.
export class ReaderTransport {
#driver: Driver
#params: InitParams
#machine: MachineRuntime<TransportState, TransportCtx, TransportEvent, TransportOutput>
#streamAC: AbortController | null = null
#streamInput: AsyncPriorityQueue<StreamReadMessage_FromClient> | null = null
#streamTask: Promise<void> | null = null
#tokenPending = false
constructor(driver: Driver, params: InitParams) {
this.#driver = driver
this.#params = params
this.#machine = createMachineRuntime<
TransportState,
TransportCtx,
{},
TransportEvent,
TransportEffect,
TransportOutput
>({
initialState: 'idle',
ctx: {},
env: {},
transition: transportTransition,
effects: {
'transport.effect.open_stream': () => {
this.#openStream()
},
'transport.effect.close_stream': async () => {
await this.#closeStream()
},
'transport.effect.finalize': async () => {
await this.#closeStream()
},
},
})
}
// The reader FSM ingests this to receive stream lifecycle events.
get events(): AsyncIterable<TransportOutput> {
return this.#machine
}
connect(): void {
this.#machine.dispatch({ type: 'transport.connect' })
}
// Enqueue a client message (read request, commit, partition-session response)
// on the current stream. No-op if the stream is gone — the reader FSM rebuilds
// its outgoing state on the next init anyway.
send(message: StreamReadMessage_FromClient, priority: number = PRIORITY_DEFAULT): boolean {
return this.#push(message, priority)
}
async sendUpdateToken(): Promise<void> {
// Coalesce: keep at most one un-acknowledged update-token queued (see the
// writer transport for the rationale) — an interval-driven push on a wedged
// stream would otherwise pile up unboundedly.
if (this.#tokenPending) {
return
}
this.#tokenPending = true
try {
let token = await this.#driver.token
let queued = this.#push(
create(StreamReadMessage_FromClientSchema, {
clientMessage: {
case: 'updateTokenRequest',
value: create(UpdateTokenRequestSchema, { token }),
},
}),
PRIORITY_TOKEN
)
Iif (!queued) {
this.#tokenPending = false // nothing landed on the wire; allow a retry
}
} catch (error) {
this.#tokenPending = false
throw error
}
}
close(): void {
this.#machine.dispatch({ type: 'transport.close' })
}
destroy(reason?: unknown): void {
this.#machine.dispatch({ type: 'transport.destroy', reason })
}
#push(message: StreamReadMessage_FromClient, priority: number): boolean {
let input = this.#streamInput
Iif (!input || input.isClosed) {
return false
}
input.push(message, priority)
return true
}
#openStream(): void {
void this.#closeStream()
let ac = new AbortController()
let input = new AsyncPriorityQueue<StreamReadMessage_FromClient>()
input.push(
create(StreamReadMessage_FromClientSchema, {
clientMessage: {
case: 'initRequest',
value: create(StreamReadMessage_InitRequestSchema, {
consumer: this.#params.consumer,
topicsReadSettings: this.#params.topicsReadSettings,
readerName: this.#params.readerName ?? '',
autoPartitioningSupport: this.#params.autoPartitioningSupport ?? false,
}),
},
}),
PRIORITY_INIT
)
let dispatch = this.#machine.dispatch.bind(this.#machine)
let task = (async () => {
try {
await this.#driver.ready(ac.signal)
let stream = this.#driver
.createClient(TopicServiceDefinition)
.streamRead(input, { signal: ac.signal })
dbg.log('stream opened (consumer=%s)', this.#params.consumer)
for await (let response of stream) {
Iif (ac.signal.aborted) {
return
}
if (response.status !== StatusIds_StatusCode.SUCCESS) {
dbg.log('recv non-success status %d', response.status)
dispatch({
type: 'transport.error',
error: new YDBError(response.status, response.issues),
})
return
}
if (response.serverMessage.case === 'initResponse') {
dbg.log(
'recv initResponse (sessionId=%s)',
response.serverMessage.value.sessionId
)
dispatch({
type: 'transport.init',
sessionId: response.serverMessage.value.sessionId,
})
continue
}
if (response.serverMessage.case === 'updateTokenResponse') {
this.#tokenPending = false
}
dispatch({ type: 'transport.message', message: response })
}
dbg.log('stream ended')
dispatch({ type: 'transport.ended' })
} catch (error) {
Eif (ac.signal.aborted) {
return
}
dbg.log('stream error: %O', error)
dispatch({ type: 'transport.error', error })
}
})()
this.#streamAC = ac
this.#streamInput = input
this.#streamTask = task
this.#tokenPending = false // fresh stream — the previous token, if any, is gone
}
async #closeStream(): Promise<void> {
let ac = this.#streamAC
let input = this.#streamInput
let task = this.#streamTask
this.#streamAC = null
this.#streamInput = null
this.#streamTask = null
if (!ac) {
return
}
ac.abort(new Error('Stream disposed'))
input?.close()
await task
}
}
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