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