src/worker/cluster-worker.ts

   1 import type { Worker } from 'cluster'
   2 import cluster from 'cluster'
   3 import type { MessageValue } from '../utility-types'
   4 import { AbstractWorker } from './abstract-worker'
   5 import type { WorkerOptions } from './worker-options'
   6
   7 /**
   8  * A cluster worker used by a poolifier `ClusterPool`.
   9  *
  10  * When this worker is inactive for more than the given `maxInactiveTime`,
  11  * it will send a termination request to its main worker.
  12  *
  13  * If you use a `DynamicClusterPool` the extra workers that were created will be terminated,
  14  * but the minimum number of workers will be guaranteed.
  15  *
  16  * @template DataType of data this worker receives from pool's execution. This can only be serializable data.
  17  * @template ResponseType of response the worker sends back to the main worker. This can only be serializable data.
  18  * @author [Christopher Quadflieg](https://github.com/Shinigami92)
  19  * @since 2.0.0
  20  */
  21 export class ClusterWorker<
  22   Data = unknown,
  23   Response = unknown
  24 > extends AbstractWorker<Worker, Data, Response> {
  25   /**
  26    * Constructs a new poolifier cluster worker.
  27    *
  28    * @param fn Function processed by the worker when the pool's `execution` function is invoked.
  29    * @param opts Options for the worker.
  30    */
  31   public constructor (fn: (data: Data) => Response, opts: WorkerOptions = {}) {
  32     super(
  33       'worker-cluster-pool:poolifier',
  34       cluster.isPrimary,
  35       fn,
  36       cluster.worker,
  37       opts
  38     )
  39   }
  40
  41   /** @inheritdoc */
  42   protected sendToMainWorker (message: MessageValue<Response>): void {
  43     this.getMainWorker().send(message)
  44   }
  45
  46   /** @inheritdoc */
  47   protected handleError (e: Error | string): string {
  48     return e instanceof Error ? e.message : e
  49   }
  50 }