src/charging-station/Bootstrap.ts

   1 // Partial Copyright Jerome Benoit. 2021. All Rights Reserved.
   2
   3 import { ChargingStationWorkerData, ChargingStationWorkerMessage, ChargingStationWorkerMessageEvents } from '../types/ChargingStationWorker';
   4
   5 import Configuration from '../utils/Configuration';
   6 import { Storage } from '../performance/storage/Storage';
   7 import { StorageFactory } from '../performance/storage/StorageFactory';
   8 import { UIServiceUtils } from './ui-websocket-services/UIServiceUtils';
   9 import UIWebSocketServer from './UIWebSocketServer';
  10 import Utils from '../utils/Utils';
  11 import WorkerAbstract from '../worker/WorkerAbstract';
  12 import WorkerFactory from '../worker/WorkerFactory';
  13 import chalk from 'chalk';
  14 import { isMainThread } from 'worker_threads';
  15 import path from 'path';
  16 import { version } from '../../package.json';
  17
  18 export default class Bootstrap {
  19   private static instance: Bootstrap | null = null;
  20   private workerImplementation: WorkerAbstract | null = null;
  21   private readonly uiWebSocketServer!: UIWebSocketServer;
  22   private readonly storage!: Storage;
  23   private numberOfChargingStations: number;
  24   private readonly version: string = version;
  25   private started: boolean;
  26   private readonly workerScript: string;
  27
  28   private constructor() {
  29     this.started = false;
  30     this.workerScript = path.join(path.resolve(__dirname, '../'), 'charging-station', 'ChargingStationWorker.js');
  31     this.initWorkerImplementation();
  32     Configuration.getUIWebSocketServer().enabled && (this.uiWebSocketServer = new UIWebSocketServer({
  33       ...Configuration.getUIWebSocketServer().options, handleProtocols: UIServiceUtils.handleProtocols
  34     }));
  35     Configuration.getPerformanceStorage().enabled && (this.storage = StorageFactory.getStorage(
  36       Configuration.getPerformanceStorage().type,
  37       Configuration.getPerformanceStorage().uri,
  38       this.logPrefix()
  39     ));
  40     Configuration.setConfigurationChangeCallback(async () => Bootstrap.getInstance().restart());
  41   }
  42
  43   public static getInstance(): Bootstrap {
  44     if (!Bootstrap.instance) {
  45       Bootstrap.instance = new Bootstrap();
  46     }
  47     return Bootstrap.instance;
  48   }
  49
  50   public async start(): Promise<void> {
  51     if (isMainThread && !this.started) {
  52       try {
  53         this.numberOfChargingStations = 0;
  54         await this.storage?.open();
  55         await this.workerImplementation.start();
  56         this.uiWebSocketServer?.start();
  57         const stationTemplateUrls = Configuration.getStationTemplateUrls();
  58         // Start ChargingStation object in worker thread
  59         if (stationTemplateUrls) {
  60           for (const stationTemplateUrl of stationTemplateUrls) {
  61             try {
  62               const nbStations = stationTemplateUrl.numberOfStations ?? 0;
  63               for (let index = 1; index <= nbStations; index++) {
  64                 const workerData: ChargingStationWorkerData = {
  65                   index,
  66                   templateFile: path.join(path.resolve(__dirname, '../'), 'assets', 'station-templates', path.basename(stationTemplateUrl.file))
  67                 };
  68                 await this.workerImplementation.addElement(workerData);
  69                 this.numberOfChargingStations++;
  70               }
  71             } catch (error) {
  72               console.error(chalk.red('Charging station start with template file ' + stationTemplateUrl.file + ' error '), error);
  73             }
  74           }
  75         } else {
  76           console.warn(chalk.yellow('No stationTemplateUrls defined in configuration, exiting'));
  77         }
  78         if (this.numberOfChargingStations === 0) {
  79           console.warn(chalk.yellow('No charging station template enabled in configuration, exiting'));
  80         } else {
  81           console.log(chalk.green(`Charging stations simulator ${this.version} started with ${this.numberOfChargingStations.toString()} charging station(s) and ${Utils.workerDynamicPoolInUse() ? `${Configuration.getWorkerPoolMinSize().toString()}/` : ''}${this.workerImplementation.size}${Utils.workerPoolInUse() ? `/${Configuration.getWorkerPoolMaxSize().toString()}` : ''} worker(s) concurrently running in '${Configuration.getWorkerProcess()}' mode${this.workerImplementation.maxElementsPerWorker ? ` (${this.workerImplementation.maxElementsPerWorker} charging station(s) per worker)` : ''}`));
  82         }
  83         this.started = true;
  84       } catch (error) {
  85         console.error(chalk.red('Bootstrap start error '), error);
  86       }
  87     } else {
  88       console.error(chalk.red('Cannot start an already started charging stations simulator'));
  89     }
  90   }
  91
  92   public async stop(): Promise<void> {
  93     if (isMainThread && this.started) {
  94       await this.workerImplementation.stop();
  95       this.uiWebSocketServer?.stop();
  96       await this.storage?.close();
  97     } else {
  98       console.error(chalk.red('Trying to stop the charging stations simulator while not started'));
  99     }
 100     this.started = false;
 101   }
 102
 103   public async restart(): Promise<void> {
 104     await this.stop();
 105     this.initWorkerImplementation();
 106     await this.start();
 107   }
 108
 109   private initWorkerImplementation(): void {
 110     this.workerImplementation = WorkerFactory.getWorkerImplementation<ChargingStationWorkerData>(this.workerScript, Configuration.getWorkerProcess(),
 111       {
 112         startDelay: Configuration.getWorkerStartDelay(),
 113         poolMaxSize: Configuration.getWorkerPoolMaxSize(),
 114         poolMinSize: Configuration.getWorkerPoolMinSize(),
 115         elementsPerWorker: Configuration.getChargingStationsPerWorker(),
 116         poolOptions: {
 117           workerChoiceStrategy: Configuration.getWorkerPoolStrategy()
 118         },
 119         messageHandler: async (msg: ChargingStationWorkerMessage) => {
 120           if (msg.id === ChargingStationWorkerMessageEvents.STARTED) {
 121             this.uiWebSocketServer.chargingStations.add(msg.data.id);
 122           } else if (msg.id === ChargingStationWorkerMessageEvents.STOPPED) {
 123             this.uiWebSocketServer.chargingStations.delete(msg.data.id);
 124           } else if (msg.id === ChargingStationWorkerMessageEvents.PERFORMANCE_STATISTICS) {
 125             await this.storage.storePerformanceStatistics(msg.data);
 126           }
 127         }
 128       });
 129   }
 130
 131   private logPrefix(): string {
 132     return Utils.logPrefix(' Bootstrap |');
 133   }
 134 }