examples/typescript/websocket-server-pool/ws-cluster/src/worker.ts

   1 import { ClusterWorker } from 'poolifier'
   2 import { type RawData, WebSocketServer } from 'ws'
   3 import {
   4   type DataPayload,
   5   type MessagePayload,
   6   MessageType,
   7   type WorkerData,
   8   type WorkerResponse
   9 } from './types.js'
  10
  11 const factorial: (n: number) => number = n => {
  12   if (n === 0) {
  13     return 1
  14   }
  15   return factorial(n - 1) * n
  16 }
  17
  18 class WebSocketServerWorker extends ClusterWorker<WorkerData, WorkerResponse> {
  19   private static wss: WebSocketServer
  20
  21   private static readonly startWebSocketServer = (
  22     workerData?: WorkerData
  23   ): WorkerResponse => {
  24     const { port } = workerData as WorkerData
  25
  26     WebSocketServerWorker.wss = new WebSocketServer({ port }, () => {
  27       console.info(
  28         `⚡️[ws server]: WebSocket server is started in cluster worker at ws://localhost:${port}/`
  29       )
  30     })
  31
  32     WebSocketServerWorker.wss.on('connection', ws => {
  33       ws.on('error', console.error)
  34       ws.on('message', (message: RawData) => {
  35         const { type, data } = JSON.parse(
  36           // eslint-disable-next-line @typescript-eslint/no-base-to-string
  37           message.toString()
  38         ) as MessagePayload<DataPayload>
  39         switch (type) {
  40           case MessageType.echo:
  41             ws.send(
  42               JSON.stringify({
  43                 type: MessageType.echo,
  44                 data
  45               })
  46             )
  47             break
  48           case MessageType.factorial:
  49             ws.send(
  50               JSON.stringify({
  51                 type: MessageType.factorial,
  52                 data: { number: factorial(data.number as number) }
  53               })
  54             )
  55             break
  56         }
  57       })
  58     })
  59     return {
  60       status: true,
  61       port: WebSocketServerWorker.wss.options.port
  62     }
  63   }
  64
  65   public constructor () {
  66     super(WebSocketServerWorker.startWebSocketServer, {
  67       killHandler: () => {
  68         WebSocketServerWorker.wss.close()
  69       }
  70     })
  71   }
  72 }
  73
  74 export const webSocketServerWorker = new WebSocketServerWorker()