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           taskFunctionNames: this.listTaskFunctionNames()
  47         })
  48       } catch {
  49         this.sendToMainWorker({
  50           ready: false,
  51           taskFunctionNames: this.listTaskFunctionNames()
  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 }