src/worker/cluster-worker.ts

   1 import type { Worker } from 'cluster'
   2 import { isMaster, worker } from 'cluster'
   3 import type { JSONValue, MessageValue } from '../utility-types'
   4 import { AbstractWorker } from './abstract-worker'
   5 import type { WorkerOptions } from './worker-options'
   6
   7 /**
   8  * An example worker that will be always alive, you just need to **extend** this class if you want a static pool.
   9  *
  10  * When this worker is inactive for more than 1 minute, it will send this info to the main worker,
  11  * if you are using DynamicClusterPool, the workers created after will be killed, the min num of worker will be guaranteed.
  12  *
  13  * @author [Christopher Quadflieg](https://github.com/Shinigami92)
  14  * @since 2.0.0
  15  */
  16 export class ClusterWorker<
  17   Data extends JSONValue = JSONValue,
  18   Response extends JSONValue = JSONValue
  19 > extends AbstractWorker<Worker, Data, Response> {
  20   public constructor (fn: (data: Data) => Response, opts: WorkerOptions = {}) {
  21     super('worker-cluster-pool:pioardi', isMaster, fn, opts)
  22
  23     worker.on('message', (value: MessageValue<Data>) => {
  24       if (value?.data && value.id) {
  25         // here you will receive messages
  26         // console.log('This is the main worker ' + isMain)
  27         if (this.async) {
  28           this.runInAsyncScope(this.runAsync.bind(this), this, fn, value)
  29         } else {
  30           this.runInAsyncScope(this.run.bind(this), this, fn, value)
  31         }
  32       } else if (value.kill) {
  33         // here is time to kill this worker, just clearing the interval
  34         if (this.interval) clearInterval(this.interval)
  35         this.emitDestroy()
  36       }
  37     })
  38   }
  39
  40   protected getMainWorker (): Worker {
  41     return worker
  42   }
  43
  44   protected sendToMainWorker (message: MessageValue<Response>): void {
  45     this.getMainWorker().send(message)
  46   }
  47
  48   protected handleError (e: Error | string): string {
  49     return e instanceof Error ? e.message : e
  50   }
  51 }