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import { timestampDate } from '@bufbuild/protobuf/wkt'
import { StatusIds_StatusCode } from '@ydbjs/api/operation'
import {
Codec,
OffsetsRangeSchema,
TopicServiceDefinition,
TransactionIdentitySchema,
UpdateOffsetsInTransactionRequestSchema,
UpdateOffsetsInTransactionRequest_TopicOffsetsSchema,
UpdateOffsetsInTransactionRequest_TopicOffsets_PartitionOffsetsSchema,
} from '@ydbjs/api/topic'
import { linkSignals } from '@ydbjs/abortable'
import type { Driver } from '@ydbjs/core'
import { loggers } from '@ydbjs/debug'
import { YDBError } from '@ydbjs/error'
import { AsyncQueue } from '@ydbjs/fsm/queue'
import { type CodecMap, defaultCodecMap, getCodec } from '../codec.js'
import { TopicMessage } from '../message.js'
import type { TopicPartitionSession } from '../partition-session.js'
import type { TX } from '../tx.js'
import { parseReadSettings } from './read-settings.js'
import {
type ReaderScope,
publishClosed,
publishCommitted,
publishErrored,
publishOpened,
publishPartitionStarted,
publishPartitionStopped,
publishReconnecting,
publishSessionStarted,
traceCommit,
} from './diagnostics.js'
import {
DEFAULT_MAX_BUFFER_BYTES,
type ReaderRuntime,
createReaderRuntime,
} from './reader-runtime.js'
import type { ReaderMessage } from './reader-state.js'
import type { TopicReadOptions, TopicReaderOptions, TopicTxReader } from './types.js'
let dbg = loggers.topic.extend('reader')
// A decoded ReadResponse: the consumer takes the messages, then the reader releases
// the response's flow-control credit (backpressure — credit is granted only as the
// consumer keeps up).
type Chunk = { messages: TopicMessage[]; releaseBytes: bigint }
type TxReadOffsetUpdate = {
partitionSession: TopicPartitionSession
offsetRange: { firstOffset: bigint; lastOffset: bigint }
}
// Bind the read offsets to the transaction via UpdateOffsetsInTransaction, so they
// become committed if and only if the transaction commits. Called from the tx.onCommit
// hook the constructor wires; a throw here fails the commit, and the offsets roll
// back with it.
let commitTxOffsets = async function commitTxOffsets(
tx: TX,
driver: Driver,
consumer: string,
updates: TxReadOffsetUpdate[]
): Promise<void> {
Iif (updates.length === 0) {
return
}
// The request nests ranges per topic per partition; updates arrive flat.
let partitionsByTopic = new Map<string, TxReadOffsetUpdate[]>()
for (let update of updates) {
let path = update.partitionSession.topicPath
let partitions = partitionsByTopic.get(path)
if (!partitions) {
partitions = []
partitionsByTopic.set(path, partitions)
}
partitions.push(update)
}
let request = create(UpdateOffsetsInTransactionRequestSchema, {
tx: create(TransactionIdentitySchema, {
id: tx.transactionId,
session: tx.sessionId,
}),
topics: Array.from(partitionsByTopic, ([path, partitions]) =>
create(UpdateOffsetsInTransactionRequest_TopicOffsetsSchema, {
path,
partitions: partitions.map((update) =>
create(UpdateOffsetsInTransactionRequest_TopicOffsets_PartitionOffsetsSchema, {
partitionId: update.partitionSession.partitionId,
partitionOffsets: [
create(OffsetsRangeSchema, {
start: update.offsetRange.firstOffset,
// The wire range is half-open; updates carry inclusive lastOffset.
end: update.offsetRange.lastOffset + 1n,
}),
],
})
),
})
),
consumer,
})
dbg.log('committing read offsets in tx %s (%d partitions)', tx.transactionId, updates.length)
let client = driver.createClient(TopicServiceDefinition)
let response = await client.updateOffsetsInTransaction(request)
Iif (response.operation?.status !== StatusIds_StatusCode.SUCCESS) {
// YDBError carries the status code and issues, so retry classifiers and user
// code can inspect it like every other server-status failure in the package.
throw new YDBError(
response.operation?.status ?? StatusIds_StatusCode.STATUS_CODE_UNSPECIFIED,
response.operation?.issues ?? []
)
}
}
// The public topic reader. read() is a pull async-iterator over decoded batches;
// commit() acknowledges offsets and resolves once the server's committed high-water
// mark reaches them — surviving transparent reconnects (never rejected by one).
export class TopicReader implements AsyncDisposable, Disposable {
#options: TopicReaderOptions
#codecs: CodecMap
#runtime: ReaderRuntime
#chunks = new AsyncQueue<Chunk>()
// waiterId -> commit() promise; the FSM only carries the id, never the callback.
#waiters = new Map<number, PromiseWithResolvers<void>>()
#nextWaiterId = 1
// partitionId -> current session, for the committed/stopped callbacks and tx hook.
#sessions = new Map<bigint, TopicPartitionSession>()
// tx read offsets: first/last delivered offset per partitionId. The FSM is
// tx-agnostic — the facade tracks these itself from delivered messages (only for a
// tx reader) and commits them in the tx.onCommit hook. Undefined for a non-tx reader.
#txReadOffsets?: Map<bigint, { firstOffset: bigint; lastOffset: bigint }>
// Shadow of the FSM's terminal error: set by the #consume drain on `reader.error`
// (or a machine fault), then consulted synchronously by read()/commit()/close() to
// surface it to the caller — the FSM cannot reject an already-running read() promise.
#lastError: unknown = undefined
#closed = false
#closing = false
#reading = false // read() is single-consumer
#transactional: boolean
#scope: ReaderScope
#closedDeferred = Promise.withResolvers<void>()
constructor(driver: Driver, options: TopicReaderOptions, runtimeOptions?: { tx?: TX }) {
this.#options = options
this.#transactional = runtimeOptions?.tx !== undefined
if (this.#transactional) {
this.#txReadOffsets = new Map()
}
this.#codecs = options.codecMap ?? defaultCodecMap
this.#scope = {
driver: driver.identity,
consumer: options.consumer,
topics: parseReadSettings(options.topic).map((settings) => settings.path),
}
publishOpened(this.#scope, {
maxBufferBytes: options.maxBufferBytes ?? DEFAULT_MAX_BUFFER_BYTES,
updateTokenIntervalMs: options.updateTokenIntervalMs ?? 60_000,
gracefulShutdownTimeoutMs: options.gracefulShutdownTimeoutMs ?? 30_000,
recoveryWindowMs: options.recoveryWindowMs ?? Infinity,
retryOnSchemeError: options.retryOnSchemeError ?? false,
})
this.#runtime = createReaderRuntime(driver, options)
// Fire-and-forget drain; an internal machine fault rethrows and is funneled to
// the terminal path (never an unhandled rejection).
this.#consume().catch((error) => this.#fail(error))
// Tx lifecycle is wired here — not in the factory — so the hooks can reach
// #-private state directly instead of going through an exported accessor.
if (runtimeOptions?.tx) {
let tx = runtimeOptions.tx
tx.onCommit(async () => {
// Bind the read offsets to the tx; on failure the commit (and thus the
// offsets) roll back, and the reader is torn down by onClose below.
await commitTxOffsets(tx, driver, options.consumer, this.#txReadOffsetUpdates())
// Release the partition once offsets are committed. A tx reader left open
// keeps the consumer's partition assigned server-side, so a later reader on
// the same consumer never gets a partition session — it hangs until its
// read deadline.
await this.close()
})
tx.onRollback(() => {
this.destroy(new Error('Transaction rolled back'))
})
tx.onClose((committed) => {
if (!committed) {
this.destroy(new Error('Transaction closed without commit'))
}
})
}
}
async *read(options?: TopicReadOptions): AsyncIterable<TopicMessage[]> {
// Single-consumer: two concurrent read() loops would race the shared chunk
// iterator and double-release flow-control credit.
if (this.#reading) {
throw new Error('read() is already in progress — the reader is single-consumer')
}
this.#reading = true
let limit = options?.limit
// `waitMs` is the deprecated alias for `batchWindowMs`.
let batchWindowMs = options?.batchWindowMs ?? options?.waitMs
let signal = options?.signal
try {
for (;;) {
if (this.#lastError) {
throw this.#lastError
}
// Accumulate a batch of up to `limit` messages, waiting at most
// `batchWindowMs` (a batch is yielded — possibly empty — once the window
// elapses so an idle topic never hangs the consumer). With no
// `batchWindowMs`, block for one chunk.
let batch: TopicMessage[] = []
let closed = false
// The batch window is a cancellation source: link it with the user signal
// so take() aborts when either fires. linkSignals (not the banned
// AbortSignal.any) releases its listeners at batch end via `using`. No
// window → wait on the user signal directly.
using window =
batchWindowMs !== undefined
? linkSignals(signal, AbortSignal.timeout(batchWindowMs))
: undefined
let waitSignal = window ? window.signal : signal
for (;;) {
let result: IteratorResult<Chunk>
try {
// oxlint-disable-next-line no-await-in-loop
result = await this.#chunks.take(waitSignal)
} catch (error) {
// A user cancel propagates; the batch window elapsing just ends
// accumulation so an idle topic yields an empty batch. Anything
// else (a failed queue) is a real fault — rethrow it.
if (signal?.aborted) {
throw signal.reason
}
Eif (waitSignal?.aborted) {
break
}
throw error
}
if (result.done) {
closed = true
break
}
let chunk = result.value
// Release the response's credit the moment its chunk is consumed — it
// has already left the buffer, and nothing downstream (a break, a
// consumer throw, a signal abort mid-window) may strand it. dispatch()
// on a closed machine is a safe no-op.
this.#runtime.machine.dispatch({
type: 'reader.read_release',
bytes: chunk.releaseBytes,
})
// Skip messages of partitions force-stopped after buffering: the
// partition already belongs to another reader which re-reads them —
// delivering here means duplicate processing and commits that reject.
for (let message of chunk.messages) {
let session = message.partitionSession.deref()
if (session !== undefined && !session.isStopped) {
batch.push(message)
}
}
if (
(limit !== undefined && batch.length >= limit) ||
batchWindowMs === undefined
) {
break
}
}
if (batch.length > 0) {
if (limit !== undefined && batch.length > limit) {
for (let i = 0; i < batch.length; i += limit) {
yield batch.slice(i, i + limit)
}
} else {
yield batch
}
} else if (batchWindowMs !== undefined && !closed) {
// Idle-window tick: yield an empty batch so the consumer can act.
yield batch
}
if (closed) {
// A terminal error surfaces to the consumer — it must not look like a
// clean end-of-stream. Any buffered batch above was delivered first, then
// we throw. The reader is already torn down (markClosed + FSM finalize):
// it is not reusable, and every further read()/commit() throws this too.
if (this.#lastError) {
throw this.#lastError
}
return
}
}
} finally {
this.#reading = false
}
}
commit(input: TopicMessage | TopicMessage[]): Promise<void> {
// The TopicTxReader type hides commit(), but the method still exists on the
// runtime object — enforce the boundary for plain-JS callers too: a manual
// commit would land outside the transaction and survive its rollback.
if (this.#transactional) {
throw new Error(
'Tx reader commits offsets via the transaction — commit() is not available'
)
}
// One span per commit covers batching, the server ack, and any reconnect in between.
return traceCommit(this.#scope, () => this.#commitOffsets(input))
}
// Debuggers and util.inspect show the constructor name, which cannot tell a tx
// reader apart — the tag makes it render as TopicReader [TopicTxReader] { ... }.
get [Symbol.toStringTag](): string {
return this.#transactional ? 'TopicTxReader' : 'TopicReader'
}
async #commitOffsets(input: TopicMessage | TopicMessage[]): Promise<void> {
if (this.#lastError) {
throw this.#lastError
}
Iif (this.#closed || this.#closing) {
throw new Error('Reader is closed — cannot commit')
}
let messages = Array.isArray(input) ? input : [input]
let byPartition = new Map<bigint, bigint[]>()
for (let message of messages) {
let session = message.partitionSession.deref()
if (!session || session.isStopped) {
throw new Error(
'Cannot commit a message from a stopped or expired partition session'
)
}
Iif (message.offset === undefined) {
throw new Error('Cannot commit a message without an offset')
}
let offsets = byPartition.get(session.partitionId)
if (offsets === undefined) {
byPartition.set(session.partitionId, [message.offset])
} else {
offsets.push(message.offset)
}
}
// One waiter per partition; the call resolves only when every partition's
// offsets are acknowledged.
let promises: Promise<void>[] = []
for (let [partitionId, offsets] of byPartition) {
offsets.sort((a, b) => (a < b ? -1 : a > b ? 1 : 0))
let waiterId = this.#nextWaiterId++
let waiter = Promise.withResolvers<void>()
this.#waiters.set(waiterId, waiter)
this.#runtime.machine.dispatch({
type: 'reader.commit',
partitionId,
offsets,
waiterId,
})
promises.push(waiter.promise)
}
await Promise.all(promises)
}
async close(): Promise<void> {
if (this.#closed) {
if (this.#lastError) {
throw this.#lastError
}
return
}
this.#closing = true
this.#runtime.machine.dispatch({ type: 'reader.close' })
await this.#closedDeferred.promise
Iif (this.#lastError) {
throw this.#lastError
}
}
destroy(reason?: unknown): void {
if (this.#closed) {
return
}
this.#closing = true
let error = reason ?? new Error('Reader destroyed')
this.#lastError = error
this.#runtime.machine.dispatch({ type: 'reader.destroy', reason: error })
}
[Symbol.dispose](): void {
this.destroy()
}
async [Symbol.asyncDispose](): Promise<void> {
try {
await this.close()
} catch (error) {
this.destroy(error)
throw error
}
}
// Snapshot of the tx read offsets (tx reader only), mapped to the sessions the tx
// commit hook needs. Read synchronously in the hook via the module-scope
// txReadOffsetUpdates() accessor — a method here would leak into the public
// TopicReader type (JSDoc @internal does not hide it).
#txReadOffsetUpdates(): TxReadOffsetUpdate[] {
Iif (!this.#txReadOffsets) {
return []
}
let updates: TxReadOffsetUpdate[] = []
for (let [partitionId, offsetRange] of this.#txReadOffsets) {
let partitionSession = this.#sessions.get(partitionId)
Eif (partitionSession) {
updates.push({ partitionSession, offsetRange })
}
}
return updates
}
// ── internals ────────────────────────────────────────────────────────────────
async #consume(): Promise<void> {
for await (let output of this.#runtime.machine) {
switch (output.type) {
case 'reader.messages': {
// tx read-offset tracking (before decode, keyed by the stable partitionId
// so it survives a reconnect — the map is never cleared mid-tx).
if (this.#txReadOffsets) {
for (let group of output.groups) {
for (let message of group.messages) {
let existing = this.#txReadOffsets.get(group.session.partitionId)
if (existing === undefined) {
this.#txReadOffsets.set(group.session.partitionId, {
firstOffset: message.offset,
lastOffset: message.offset,
})
} else if (message.offset > existing.lastOffset) {
// Grow-only: a mid-tx reconnect redelivers from the committed
// offset, and a rewound range would commit fewer offsets than
// the transaction consumed.
existing.lastOffset = message.offset
}
}
}
}
try {
let messages: TopicMessage[] = []
for (let group of output.groups) {
for (let message of group.messages) {
messages.push(this.#toMessage(group.session, message))
}
}
this.#chunks.push({ messages, releaseBytes: output.releaseBytes })
} catch (error) {
// An undecodable message (corrupt payload / unsupported codec)
// faults the reader — tear the machine down cleanly rather than
// crash the drain loop into an unhandled rejection.
this.#lastError ??= error
this.#runtime.machine.dispatch({ type: 'reader.destroy', reason: error })
}
break
}
case 'reader.partition.started':
this.#sessions.set(output.partitionId, output.session)
publishPartitionStarted(
this.#scope,
output.partitionId,
output.partitionSessionId,
output.committedOffset
)
break
case 'reader.partition.stopped': {
let session = this.#sessions.get(output.partitionId)
if (session && this.#options.onPartitionSessionStop) {
// Callback errors are logged via dbg and ignored — a throwing user
// callback must never break the machine. Async rejections are caught
// the same way.
try {
Promise.resolve(
this.#options.onPartitionSessionStop(
session,
session.partitionCommittedOffset
)
).catch((error) => dbg.log('onPartitionSessionStop threw: %O', error))
} catch (error) {
dbg.log('onPartitionSessionStop threw: %O', error)
}
}
publishPartitionStopped(this.#scope, output.partitionId, output.reason)
// Drop the stopped partition's session to keep the map bounded. The tx
// reader keeps it (its offsets are committed at tx commit) and clears
// everything on terminal; a re-Started partition re-registers anyway.
Eif (!this.#transactional) {
this.#sessions.delete(output.partitionId)
}
break
}
case 'reader.partition.committed': {
let session = this.#sessions.get(output.partitionId)
Iif (session && this.#options.onCommittedOffset) {
// Callback errors are logged via dbg and ignored — a throwing user
// callback must never break the machine.
try {
this.#options.onCommittedOffset(session, output.committedOffset)
} catch (error) {
dbg.log('onCommittedOffset threw: %O', error)
}
}
publishCommitted(this.#scope, output.partitionId, output.committedOffset)
break
}
case 'reader.commit.resolved': {
let waiter = this.#waiters.get(output.waiterId)
Eif (waiter) {
this.#waiters.delete(output.waiterId)
waiter.resolve()
}
break
}
case 'reader.commit.rejected': {
let waiter = this.#waiters.get(output.waiterId)
Eif (waiter) {
this.#waiters.delete(output.waiterId)
waiter.reject(output.reason)
}
break
}
case 'reader.reconnecting':
dbg.log('reconnecting (attempt %d): %O', output.attempt, output.error)
publishReconnecting(this.#scope, output.attempt, output.error)
break
case 'reader.error':
dbg.log('errored: %O', output.error)
this.#lastError = output.error
publishErrored(this.#scope, output.error)
break
case 'reader.closed':
dbg.log('closed')
publishClosed(this.#scope)
this.#markClosed()
break
case 'reader.session':
dbg.log('session started (id=%s)', output.sessionId)
publishSessionStarted(this.#scope, output.sessionId)
break
}
}
// Stream ended; if no reader.closed arrived, the machine faulted — surface it.
Iif (!this.#closed) {
this.#fail(
this.#runtime.machine.signal.reason ?? new Error('Reader stopped unexpectedly')
)
}
}
#toMessage(session: TopicPartitionSession, message: ReaderMessage): TopicMessage {
return new TopicMessage({
partitionSession: session,
producer: message.producer,
payload: this.#decode(session, message),
codec: message.codec as Codec,
seqNo: message.seqNo,
offset: message.offset,
uncompressedSize: message.uncompressedSize,
...(message.createdAt && { createdAt: timestampDate(message.createdAt).getTime() }),
...(message.writtenAt && { writtenAt: timestampDate(message.writtenAt).getTime() }),
...(message.metadataItems.length > 0 && {
metadataItems: Object.fromEntries(
message.metadataItems.map((item) => [item.key, item.value])
),
}),
})
}
#decode(session: TopicPartitionSession, message: ReaderMessage): Uint8Array {
// UNSPECIFIED means "no codec recorded" — the payload is raw bytes (the current
// server normalizes missing codecs to RAW before delivery; older ones could
// leave it unset). Decompressing would corrupt it; erroring would kill the
// reader over absent metadata.
if (message.codec === Codec.UNSPECIFIED) {
return message.data
}
try {
let codec = this.#codecs.get(message.codec) ?? getCodec(message.codec as Codec)
return codec.decompress(message.data)
} catch (error) {
// Terminal by design: the protocol has no way to refuse a single partition,
// and skipping silently would be data loss. Make the error actionable.
throw new Error(
`Cannot decode message at offset ${message.offset} of partition ${session.partitionId} (${session.topicPath}): codec ${message.codec} — register it in codecMap`,
{ cause: error }
)
}
}
#markClosed(): void {
Iif (this.#closed) {
return
}
this.#closed = true
this.#chunks.close()
this.#sessions.clear()
this.#txReadOffsets?.clear()
// The FSM's terminate() already rejects outstanding commits via
// reader.commit.rejected; this settles any that slipped through, avoiding leaks.
for (let waiter of this.#waiters.values()) {
waiter.reject(this.#lastError ?? new Error('Reader closed'))
}
this.#waiters.clear()
this.#closedDeferred.resolve()
}
#fail(error: unknown): void {
if (this.#closed) {
return
}
this.#lastError ??= error
this.#markClosed()
}
}
export function createTopicReader(driver: Driver, options: TopicReaderOptions): TopicReader {
return new TopicReader(driver, options)
}
export function createTopicTxReader(
tx: TX,
driver: Driver,
options: TopicReaderOptions
): TopicTxReader {
// The constructor wires the tx lifecycle. The instance is returned as-is under the
// TopicTxReader type: offsets are tracked automatically, commit() is hidden by the
// type and guarded at runtime, and the Symbol.toStringTag renders the tx flavor.
return new TopicReader(driver, options, { tx })
}
|