---
[poolifier.git] / src / worker / cluster-worker.ts
1 import cluster, { type Worker } from 'node:cluster'
2
3 import type { MessageValue } from '../utility-types.js'
4 import { AbstractWorker } from './abstract-worker.js'
5 import type { TaskFunction, TaskFunctions } from './task-functions.js'
6 import type { WorkerOptions } from './worker-options.js'
7
8 /**
9 * A cluster worker used by a poolifier `ClusterPool`.
10 *
11 * When this worker is inactive for more than the given `maxInactiveTime`,
12 * it will send a termination request to its main worker.
13 *
14 * If you use a `DynamicClusterPool` the extra workers that were created will be terminated,
15 * but the minimum number of workers will be guaranteed.
16 *
17 * @typeParam Data - Type of data this worker receives from pool's execution. This can only be structured-cloneable data.
18 * @typeParam Response - Type of response the worker sends back to the main worker. This can only be structured-cloneable data.
19 * @author [Christopher Quadflieg](https://github.com/Shinigami92)
20 * @since 2.0.0
21 */
22 export class ClusterWorker<
23 Data = unknown,
24 Response = unknown
25 > extends AbstractWorker<Worker, Data, Response> {
26 /**
27 * Constructs a new poolifier cluster worker.
28 *
29 * @param taskFunctions - Task function(s) processed by the worker when the pool's `execution` function is invoked.
30 * @param opts - Options for the worker.
31 */
32 public constructor (
33 taskFunctions: TaskFunction<Data, Response> | TaskFunctions<Data, Response>,
34 opts: WorkerOptions = {}
35 ) {
36 super(cluster.isPrimary, cluster.worker, taskFunctions, opts)
37 }
38
39 /** @inheritDoc */
40 protected handleReadyMessage (message: MessageValue<Data>): void {
41 if (message.workerId === this.id && message.ready === false) {
42 try {
43 this.getMainWorker().on('message', this.messageListener.bind(this))
44 this.sendToMainWorker({
45 ready: true,
46 taskFunctionsProperties: this.listTaskFunctionsProperties()
47 })
48 } catch {
49 this.sendToMainWorker({
50 ready: false,
51 taskFunctionsProperties: this.listTaskFunctionsProperties()
52 })
53 }
54 }
55 }
56
57 /** @inheritDoc */
58 protected get id (): number {
59 return this.getMainWorker().id
60 }
61
62 /** @inheritDoc */
63 protected readonly sendToMainWorker = (
64 message: MessageValue<Response>
65 ): void => {
66 this.getMainWorker().send({
67 ...message,
68 workerId: this.id
69 } satisfies MessageValue<Response>)
70 }
71 }