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import Kafka, {type Message} from 'node-rdkafka';
import {Duplex} from 'stream';
type KafkaConfig = ConstructorParameters<typeof Kafka.KafkaConsumer>[0];
type CodecInstance = {
encode: (...args: unknown[]) => Promise<string | Buffer<ArrayBufferLike>>;
decode: (...args: unknown[]) => Promise<object[]>;
};
export interface IConfig {
connection: KafkaConfig;
consume: {
topics: string[];
groupId: string;
};
codec?: {
new (config: object): CodecInstance;
};
/**
* Operation mode.
* - `'stream'` (default): a produce/consume message adapter — every triple
* is routed through the Kafka stream (the request is encoded and produced
* to `consume.topics`, the response is consumed + decoded). This is the
* original design for message round-trips.
* - `'admin'`: an introspection adapter — triples are routed to `exec`
* (like the API adapters: `super.connect()` → `handle()` → `exec`), so
* `{ns}.topic.list` (broker metadata) and `{ns}.topic.find` (message
* reads via one-off consumers) are reachable. No produce/consume stream.
*/
mode?: 'stream' | 'admin';
}
export default adapter<IConfig>(() => {
let stream: Duplex | null = null;
let codec: CodecInstance | null = null;
let producerStream: ReturnType<typeof Kafka.Producer.createWriteStream> | null = null;
let consumerStream:
| (ReturnType<typeof Kafka.KafkaConsumer.createReadStream> & {
consumer: {
isConnected(): boolean;
once(event: 'ready', cb: () => void): void;
assignments(): {partition: number; topic: string; offset: number}[];
getMetadata(
opts: {timeout: number},
cb: (
err: Error | null,
data?: {topics?: Array<{name: string; partitions: unknown[]}>},
) => void,
): void;
};
})
| null = null;
return {
activation: {
default: {
type: 'kafka',
connection: {
'client.id': 'blong',
'security.protocol': 'sasl_plaintext',
'sasl.mechanism': 'SCRAM-SHA-256',
},
},
},
async start() {
const result = await super.start();
const isAdmin = this.config.mode === 'admin';
// The codec encodes/decodes the Kafka stream message format. Admin
// (introspection) mode routes triples to `exec` (plain object
// responses), so the codec must NOT be applied there — a stream
// codec would try `msg.value.toString()` on the exec result.
if (this.config.codec && !isAdmin) {
codec = new this.config.codec({});
this.encode = (...params) => codec!.encode(...params);
this.decode = (...params) => codec!.decode(...params);
} else {
codec = null;
}
const groupId = this.config.consume.groupId;
const startedAt = Date.now();
const consumerConfig = {
...this.config.connection,
'group.id': groupId,
};
this.log?.info?.(
{
groupId,
topics: this.config.consume.topics,
sessionTimeoutMs: consumerConfig['session.timeout.ms'],
broker: consumerConfig['metadata.broker.list'],
},
'kafka consumer creating',
);
consumerStream = Kafka.KafkaConsumer.createReadStream(
consumerConfig,
{
'auto.offset.reset': 'earliest',
},
{topics: this.config.consume.topics},
) as typeof consumerStream;
// Wait for consumer to connect and receive partition assignments.
// node-rdkafka group rebalance can take up to a few seconds after 'ready'.
await new Promise<void>((resolve, reject) => {
let poll: ReturnType<typeof setInterval> | null = null;
let safety: ReturnType<typeof setTimeout> | null = null;
const cleanup = () => {
if (poll) clearInterval(poll);
if (safety) clearTimeout(safety);
poll = null;
safety = null;
};
const startPolling = () => {
poll = setInterval(() => {
if (consumerStream!.consumer.assignments().length > 0) {
cleanup();
this.log?.info?.(
{groupId, elapsedMs: Date.now() - startedAt},
'kafka consumer assigned',
);
resolve();
}
}, 200);
safety = setTimeout(() => {
cleanup();
this.log?.warn?.(
{
groupId,
elapsedMs: Date.now() - startedAt,
hint: 'stale group members from an earlier abrupt shutdown keep the rebalance waiting up to session.timeout.ms',
},
'kafka consumer assignment timed out',
);
// Best-effort graceful close BEFORE failing start: a
// consumer that joined the group but never got an
// assignment would otherwise linger as a stale group
// member (no LeaveGroup), blocking the NEXT rebalance
// for up to session.timeout.ms too. destroy() →
// close() → disconnect() sends LeaveGroup.
try {
consumerStream?.destroy();
} catch {
// ignore — the process is already failing start
}
reject(new Error('Kafka assignment timeout'));
}, 30000);
};
if (consumerStream!.consumer.isConnected()) {
this.log?.info?.({groupId}, 'kafka consumer already connected');
startPolling();
} else {
this.log?.info?.({groupId}, 'kafka consumer connecting, waiting for ready');
consumerStream!.consumer.once('ready', () => {
this.log?.info?.(
{groupId, elapsedMs: Date.now() - startedAt},
'kafka consumer ready',
);
startPolling();
});
}
});
if (this.config.mode === 'admin') {
// Admin/introspection mode — route triples to `exec`
// (`super.connect()` → `handle()` → `findHandler(method) ||
// imported['exec']`). The consumer stays connected for broker
// metadata (`{ns}.topic.list` uses `getMetadata`); the
// produce/consume Duplex is not built and no messages are
// consumed by this adapter instance.
super.connect();
} else {
producerStream = Kafka.Producer.createWriteStream(
{
...this.config.connection,
},
{},
{
objectMode: true,
},
);
// Build a custom Duplex that writes to the Kafka producer and
// receives messages from the Kafka consumer via 'data' events.
// Duplex.from({readable, writable}) is not used because it does
// not reliably forward object-mode events from the inner readable.
stream = new Duplex({objectMode: true, read() {}});
stream.write = (chunk, ...args) =>
(producerStream!.write as (...a: unknown[]) => boolean)(chunk, ...args);
consumerStream!.on('data', msg => stream?.push(msg));
consumerStream!.on('end', () => stream?.push(null));
consumerStream!.on('error', err => stream?.destroy(err as Error));
super.connect(stream);
}
return result;
},
async stop(...params: unknown[]) {
const groupId = this.config.consume.groupId;
const stopStartedAt = Date.now();
this.log?.info?.({groupId}, 'kafka adapter stop');
const awaitClose = (
s: {once(e: 'close', cb: () => void): void} | null,
disconnect: () => void,
ms: number,
) =>
!s
? Promise.resolve()
: new Promise<void>(resolve => {
const t = setTimeout(() => {
this.log?.warn?.(
{
groupId,
waitMs: ms,
elapsedMs: Date.now() - stopStartedAt,
hint: 'consumer/producer did not emit close — the group member was not gracefully removed',
},
'kafka close timed out',
);
resolve();
}, ms);
s.once('close', () => {
clearTimeout(t);
this.log?.info?.(
{
groupId,
elapsedMs: Date.now() - stopStartedAt,
},
'kafka consumer/producer closed (LeaveGroup sent)',
);
resolve();
});
disconnect();
});
let result;
try {
stream?.destroy();
// consumerStream.destroy() → close() → consumer.disconnect() → emits 'close'
// producerStream.close() → producer.disconnect() → emits 'close'
// Both must complete so rdkafka uv handles are released and the process exits.
await Promise.all([
awaitClose(consumerStream, () => consumerStream?.destroy(), 20000),
awaitClose(
producerStream as unknown as Parameters<typeof awaitClose>[0],
() => (producerStream as unknown as {close(): void} | null)?.close(),
20000,
),
]);
this.log?.info?.(
{groupId, elapsedMs: Date.now() - stopStartedAt},
'kafka adapter stop complete',
);
} finally {
stream = null;
codec = null;
consumerStream = null;
producerStream = null;
result = await super.stop(...params);
}
return result;
},
async exec(
params: Record<string, unknown>,
$meta: IMeta,
): Promise<unknown> {
const {method} = $meta;
const [, object, operation] = method!.split('.');
if (object === 'topic') {
switch (operation) {
case 'list': {
// `{ns}.topic.list` — enumerate topics from broker metadata
if (!consumerStream) {
throw new Error('Kafka consumer not connected');
}
const metadata = await new Promise<{
topics: Array<{name: string; partitions: unknown[]}>;
}>((resolve, reject) => {
consumerStream!.consumer.getMetadata(
{timeout: 5000, allTopics: true},
(err, data) => (err ? reject(err) : resolve(data ?? {topics: []})),
);
});
return {
items: (metadata.topics ?? [])
.filter(t => !t.name.startsWith('__'))
.map(t => ({
topic: t.name,
partitionCount: t.partitions?.length ?? 0,
})),
};
}
case 'find': {
// `{ns}.topic.find` — read a batch of messages from a topic.
// A fresh consumer group with `auto.offset.reset: earliest`
// reads existing messages from the beginning (exploration);
// partitions are surfaced as message metadata, not tree nodes.
const topic = params.topic as string;
const limit = (params.limit as number) ?? 50;
if (!topic) {
throw new Error('Missing topic param');
}
const consumer = new Kafka.KafkaConsumer(
{
...this.config.connection,
'group.id': `blong-commander-${Date.now()}`,
},
{'auto.offset.reset': 'earliest'},
);
// A fresh group must complete the rebalance (group join +
// partition assignment) before the first consume returns.
consumer.setDefaultConsumeTimeout(3000);
// Always RESOLVE to a (possibly empty) batch — a rebalance
// stall or broker hiccup must surface as an empty topic, not
// as a malformed/empty RPC response ("JSON RPC response
// without response and error").
const messages = await new Promise<Message[] | undefined>(resolve => {
const timer = setTimeout(() => {
try {
consumer.disconnect();
} catch {
// ignore
}
resolve(undefined);
}, 15000);
const done = (msgs: Message[] | undefined) => {
clearTimeout(timer);
try {
consumer.disconnect();
} catch {
// ignore
}
resolve(msgs);
};
consumer.on('ready', () => {
consumer.subscribe([topic]);
consumer.consume(limit, (err, msgs) => {
if (err) return done(undefined);
done(msgs);
});
});
consumer.on('event.error', () => done(undefined));
consumer.connect();
});
return {
items: (messages ?? []).map(m => ({
topic: m.topic,
partition: m.partition,
offset: m.offset,
key: m.key?.toString(),
value: m.value?.toString(),
timestamp: m.timestamp,
})),
};
}
}
}
throw new Error(`Unknown kafka operation: ${object}.${operation}`);
},
};
});
|