src/charging-station/WorkerBroadcastChannel.ts

   1 import { BroadcastChannel } from 'worker_threads';
   2
   3 import type { JsonType } from '../types/JsonType';
   4 import type {
   5   BroadcastChannelRequest,
   6   BroadcastChannelResponse,
   7   MessageEvent,
   8 } from '../types/WorkerBroadcastChannel';
   9 import logger from '../utils/Logger';
  10 import Utils from '../utils/Utils';
  11
  12 const moduleName = 'WorkerBroadcastChannel';
  13
  14 export default abstract class WorkerBroadcastChannel extends BroadcastChannel {
  15   protected constructor() {
  16     super('worker');
  17   }
  18
  19   public sendRequest(request: BroadcastChannelRequest): void {
  20     this.postMessage(request);
  21   }
  22
  23   protected sendResponse(response: BroadcastChannelResponse): void {
  24     this.postMessage(response);
  25   }
  26
  27   protected isRequest(message: JsonType[]): boolean {
  28     return Array.isArray(message) === true && message.length === 3;
  29   }
  30
  31   protected isResponse(message: JsonType[]): boolean {
  32     return Array.isArray(message) === true && message.length === 2;
  33   }
  34
  35   protected validateMessageEvent(messageEvent: MessageEvent): MessageEvent | false {
  36     if (Array.isArray(messageEvent.data) === false) {
  37       logger.error(
  38         `${this.logPrefix(
  39           moduleName,
  40           'validateMessageEvent'
  41         )} Worker broadcast channel protocol message event data is not an array`
  42       );
  43       return false;
  44     }
  45     if (Utils.validateUUID(messageEvent.data[0]) === false) {
  46       logger.error(
  47         `${this.logPrefix(
  48           moduleName,
  49           'validateMessageEvent'
  50         )} Worker broadcast channel protocol message event data UUID field is invalid`
  51       );
  52       return false;
  53     }
  54     return messageEvent;
  55   }
  56
  57   private logPrefix = (modName: string, methodName: string): string => {
  58     return Utils.logPrefix(` Worker Broadcast Channel | ${modName}.${methodName}:`);
  59   };
  60 }