src/charging-station/ui-server/UIWebSocketServer.ts

   1 import { IncomingMessage } from 'http';
   2
   3 import WebSocket from 'ws';
   4
   5 import { ServerOptions } from '../../types/ConfigurationData';
   6 import { Protocol, ProtocolVersion } from '../../types/UIProtocol';
   7 import Configuration from '../../utils/Configuration';
   8 import logger from '../../utils/Logger';
   9 import Utils from '../../utils/Utils';
  10 import { AbstractUIServer } from './AbstractUIServer';
  11 import UIServiceFactory from './ui-services/UIServiceFactory';
  12
  13 const moduleName = 'UIWebSocketServer';
  14
  15 export default class UIWebSocketServer extends AbstractUIServer {
  16   public constructor(options?: ServerOptions) {
  17     super();
  18     this.server = new WebSocket.Server(options ?? Configuration.getUIServer().options);
  19   }
  20
  21   public start(): void {
  22     this.server.on('connection', (socket: WebSocket, request: IncomingMessage): void => {
  23       const protocolIndex = socket.protocol.indexOf(Protocol.UI);
  24       const version = socket.protocol.substring(
  25         protocolIndex + Protocol.UI.length
  26       ) as ProtocolVersion;
  27       if (!this.uiServices.has(version)) {
  28         this.uiServices.set(version, UIServiceFactory.getUIServiceImplementation(version, this));
  29       }
  30       // FIXME: check connection validity
  31       socket.on('message', (messageData) => {
  32         this.uiServices
  33           .get(version)
  34           .requestHandler(messageData)
  35           .catch((error) => {
  36             logger.error(
  37               `${this.logPrefix(
  38                 moduleName,
  39                 'start.socket.onmessage'
  40               )} Error while handling message:`,
  41               error
  42             );
  43           });
  44       });
  45       socket.on('error', (error) => {
  46         logger.error(
  47           `${this.logPrefix(moduleName, 'start.socket.onerror')} Error on WebSocket:`,
  48           error
  49         );
  50       });
  51     });
  52   }
  53
  54   public stop(): void {
  55     this.server.close();
  56   }
  57
  58   public sendRequest(request: string): void {
  59     this.broadcastToClients(request);
  60   }
  61
  62   public sendResponse(response: string): void {
  63     this.broadcastToClients(response);
  64   }
  65
  66   public logPrefix(modName?: string, methodName?: string): string {
  67     const logMsg =
  68       modName && methodName
  69         ? ` UI WebSocket Server | ${modName}.${methodName}:`
  70         : ' UI WebSocket Server |';
  71     return Utils.logPrefix(logMsg);
  72   }
  73
  74   private broadcastToClients(message: string): void {
  75     for (const client of (this.server as WebSocket.Server).clients) {
  76       if (client?.readyState === WebSocket.OPEN) {
  77         client.send(message);
  78       }
  79     }
  80   }
  81 }