src/charging-station/AutomaticTransactionGenerator.ts

   1 // Partial Copyright Jerome Benoit. 2021-2023. All Rights Reserved.
   2
   3 import { AsyncResource } from 'node:async_hooks';
   4
   5 import { hoursToMilliseconds, secondsToMilliseconds } from 'date-fns';
   6
   7 import type { ChargingStation } from './ChargingStation';
   8 import { IdTagsCache } from './IdTagsCache';
   9 import { checkChargingStation } from './Utils';
  10 import { BaseError } from '../exception';
  11 import { PerformanceStatistics } from '../performance';
  12 import {
  13   AuthorizationStatus,
  14   type AuthorizeRequest,
  15   type AuthorizeResponse,
  16   ConnectorStatusEnum,
  17   RequestCommand,
  18   type StartTransactionRequest,
  19   type StartTransactionResponse,
  20   type Status,
  21   StopTransactionReason,
  22   type StopTransactionResponse,
  23 } from '../types';
  24 import {
  25   Constants,
  26   cloneObject,
  27   formatDurationMilliSeconds,
  28   getRandomInteger,
  29   isNullOrUndefined,
  30   logPrefix,
  31   logger,
  32   secureRandom,
  33   sleep,
  34 } from '../utils';
  35
  36 const moduleName = 'AutomaticTransactionGenerator';
  37
  38 export class AutomaticTransactionGenerator extends AsyncResource {
  39   private static readonly instances: Map<string, AutomaticTransactionGenerator> = new Map<
  40     string,
  41     AutomaticTransactionGenerator
  42   >();
  43
  44   public readonly connectorsStatus: Map<number, Status>;
  45   public started: boolean;
  46   private starting: boolean;
  47   private stopping: boolean;
  48   private readonly chargingStation: ChargingStation;
  49
  50   private constructor(chargingStation: ChargingStation) {
  51     super(moduleName);
  52     this.started = false;
  53     this.starting = false;
  54     this.stopping = false;
  55     this.chargingStation = chargingStation;
  56     this.connectorsStatus = new Map<number, Status>();
  57     this.initializeConnectorsStatus();
  58   }
  59
  60   public static getInstance(
  61     chargingStation: ChargingStation,
  62   ): AutomaticTransactionGenerator | undefined {
  63     if (AutomaticTransactionGenerator.instances.has(chargingStation.stationInfo.hashId) === false) {
  64       AutomaticTransactionGenerator.instances.set(
  65         chargingStation.stationInfo.hashId,
  66         new AutomaticTransactionGenerator(chargingStation),
  67       );
  68     }
  69     return AutomaticTransactionGenerator.instances.get(chargingStation.stationInfo.hashId);
  70   }
  71
  72   public start(): void {
  73     if (checkChargingStation(this.chargingStation, this.logPrefix()) === false) {
  74       return;
  75     }
  76     if (this.started === true) {
  77       logger.warn(`${this.logPrefix()} is already started`);
  78       return;
  79     }
  80     if (this.starting === true) {
  81       logger.warn(`${this.logPrefix()} is already starting`);
  82       return;
  83     }
  84     this.starting = true;
  85     this.startConnectors();
  86     this.started = true;
  87     this.starting = false;
  88   }
  89
  90   public stop(): void {
  91     if (this.started === false) {
  92       logger.warn(`${this.logPrefix()} is already stopped`);
  93       return;
  94     }
  95     if (this.stopping === true) {
  96       logger.warn(`${this.logPrefix()} is already stopping`);
  97       return;
  98     }
  99     this.stopping = true;
 100     this.stopConnectors();
 101     this.started = false;
 102     this.stopping = false;
 103   }
 104
 105   public startConnector(connectorId: number): void {
 106     if (checkChargingStation(this.chargingStation, this.logPrefix(connectorId)) === false) {
 107       return;
 108     }
 109     if (this.connectorsStatus.has(connectorId) === false) {
 110       logger.error(`${this.logPrefix(connectorId)} starting on non existing connector`);
 111       throw new BaseError(`Connector ${connectorId} does not exist`);
 112     }
 113     if (this.connectorsStatus.get(connectorId)?.start === false) {
 114       this.runInAsyncScope(
 115         this.internalStartConnector.bind(this) as (
 116           this: AutomaticTransactionGenerator,
 117           ...args: unknown[]
 118         ) => Promise<void>,
 119         this,
 120         connectorId,
 121       ).catch(Constants.EMPTY_FUNCTION);
 122     } else if (this.connectorsStatus.get(connectorId)?.start === true) {
 123       logger.warn(`${this.logPrefix(connectorId)} is already started on connector`);
 124     }
 125   }
 126
 127   public stopConnector(connectorId: number): void {
 128     if (this.connectorsStatus.has(connectorId) === false) {
 129       logger.error(`${this.logPrefix(connectorId)} stopping on non existing connector`);
 130       throw new BaseError(`Connector ${connectorId} does not exist`);
 131     }
 132     if (this.connectorsStatus.get(connectorId)?.start === true) {
 133       this.connectorsStatus.get(connectorId)!.start = false;
 134     } else if (this.connectorsStatus.get(connectorId)?.start === false) {
 135       logger.warn(`${this.logPrefix(connectorId)} is already stopped on connector`);
 136     }
 137   }
 138
 139   private startConnectors(): void {
 140     if (
 141       this.connectorsStatus?.size > 0 &&
 142       this.connectorsStatus.size !== this.chargingStation.getNumberOfConnectors()
 143     ) {
 144       this.connectorsStatus.clear();
 145       this.initializeConnectorsStatus();
 146     }
 147     if (this.chargingStation.hasEvses) {
 148       for (const [evseId, evseStatus] of this.chargingStation.evses) {
 149         if (evseId > 0) {
 150           for (const connectorId of evseStatus.connectors.keys()) {
 151             this.startConnector(connectorId);
 152           }
 153         }
 154       }
 155     } else {
 156       for (const connectorId of this.chargingStation.connectors.keys()) {
 157         if (connectorId > 0) {
 158           this.startConnector(connectorId);
 159         }
 160       }
 161     }
 162   }
 163
 164   private stopConnectors(): void {
 165     if (this.chargingStation.hasEvses) {
 166       for (const [evseId, evseStatus] of this.chargingStation.evses) {
 167         if (evseId > 0) {
 168           for (const connectorId of evseStatus.connectors.keys()) {
 169             this.stopConnector(connectorId);
 170           }
 171         }
 172       }
 173     } else {
 174       for (const connectorId of this.chargingStation.connectors.keys()) {
 175         if (connectorId > 0) {
 176           this.stopConnector(connectorId);
 177         }
 178       }
 179     }
 180   }
 181
 182   private async internalStartConnector(connectorId: number): Promise<void> {
 183     this.setStartConnectorStatus(connectorId);
 184     logger.info(
 185       `${this.logPrefix(
 186         connectorId,
 187       )} started on connector and will run for ${formatDurationMilliSeconds(
 188         this.connectorsStatus.get(connectorId)!.stopDate!.getTime() -
 189           this.connectorsStatus.get(connectorId)!.startDate!.getTime(),
 190       )}`,
 191     );
 192     while (this.connectorsStatus.get(connectorId)?.start === true) {
 193       if (!this.canStartConnector(connectorId)) {
 194         this.stopConnector(connectorId);
 195         break;
 196       }
 197       if (!this.chargingStation?.ocppRequestService) {
 198         logger.info(
 199           `${this.logPrefix(
 200             connectorId,
 201           )} transaction loop waiting for charging station service to be initialized`,
 202         );
 203         do {
 204           await sleep(Constants.CHARGING_STATION_ATG_INITIALIZATION_TIME);
 205         } while (!this.chargingStation?.ocppRequestService);
 206       }
 207       const wait = secondsToMilliseconds(
 208         getRandomInteger(
 209           this.chargingStation.getAutomaticTransactionGeneratorConfiguration()
 210             .maxDelayBetweenTwoTransactions,
 211           this.chargingStation.getAutomaticTransactionGeneratorConfiguration()
 212             .minDelayBetweenTwoTransactions,
 213         ),
 214       );
 215       logger.info(`${this.logPrefix(connectorId)} waiting for ${formatDurationMilliSeconds(wait)}`);
 216       await sleep(wait);
 217       const start = secureRandom();
 218       if (
 219         start <
 220         this.chargingStation.getAutomaticTransactionGeneratorConfiguration().probabilityOfStart
 221       ) {
 222         this.connectorsStatus.get(connectorId)!.skippedConsecutiveTransactions = 0;
 223         // Start transaction
 224         const startResponse = await this.startTransaction(connectorId);
 225         if (startResponse?.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
 226           // Wait until end of transaction
 227           const waitTrxEnd = secondsToMilliseconds(
 228             getRandomInteger(
 229               this.chargingStation.getAutomaticTransactionGeneratorConfiguration().maxDuration,
 230               this.chargingStation.getAutomaticTransactionGeneratorConfiguration().minDuration,
 231             ),
 232           );
 233           logger.info(
 234             `${this.logPrefix(connectorId)} transaction started with id ${this.chargingStation
 235               .getConnectorStatus(connectorId)
 236               ?.transactionId?.toString()} and will stop in ${formatDurationMilliSeconds(
 237               waitTrxEnd,
 238             )}`,
 239           );
 240           await sleep(waitTrxEnd);
 241           // Stop transaction
 242           logger.info(
 243             `${this.logPrefix(connectorId)} stop transaction with id ${this.chargingStation
 244               .getConnectorStatus(connectorId)
 245               ?.transactionId?.toString()}`,
 246           );
 247           await this.stopTransaction(connectorId);
 248         }
 249       } else {
 250         ++this.connectorsStatus.get(connectorId)!.skippedConsecutiveTransactions!;
 251         ++this.connectorsStatus.get(connectorId)!.skippedTransactions!;
 252         logger.info(
 253           `${this.logPrefix(connectorId)} skipped consecutively ${this.connectorsStatus
 254             .get(connectorId)
 255             ?.skippedConsecutiveTransactions?.toString()}/${this.connectorsStatus
 256             .get(connectorId)
 257             ?.skippedTransactions?.toString()} transaction(s)`,
 258         );
 259       }
 260       this.connectorsStatus.get(connectorId)!.lastRunDate = new Date();
 261     }
 262     this.connectorsStatus.get(connectorId)!.stoppedDate = new Date();
 263     logger.info(
 264       `${this.logPrefix(
 265         connectorId,
 266       )} stopped on connector and lasted for ${formatDurationMilliSeconds(
 267         this.connectorsStatus.get(connectorId)!.stoppedDate!.getTime() -
 268           this.connectorsStatus.get(connectorId)!.startDate!.getTime(),
 269       )}`,
 270     );
 271     logger.debug(
 272       `${this.logPrefix(connectorId)} connector status: %j`,
 273       this.connectorsStatus.get(connectorId),
 274     );
 275   }
 276
 277   private setStartConnectorStatus(connectorId: number): void {
 278     this.connectorsStatus.get(connectorId)!.skippedConsecutiveTransactions = 0;
 279     const previousRunDuration =
 280       this.connectorsStatus.get(connectorId)?.startDate &&
 281       this.connectorsStatus.get(connectorId)?.lastRunDate
 282         ? this.connectorsStatus.get(connectorId)!.lastRunDate!.getTime() -
 283           this.connectorsStatus.get(connectorId)!.startDate!.getTime()
 284         : 0;
 285     this.connectorsStatus.get(connectorId)!.startDate = new Date();
 286     this.connectorsStatus.get(connectorId)!.stopDate = new Date(
 287       this.connectorsStatus.get(connectorId)!.startDate!.getTime() +
 288         hoursToMilliseconds(
 289           this.chargingStation.getAutomaticTransactionGeneratorConfiguration().stopAfterHours,
 290         ) -
 291         previousRunDuration,
 292     );
 293     this.connectorsStatus.get(connectorId)!.start = true;
 294   }
 295
 296   private canStartConnector(connectorId: number): boolean {
 297     if (new Date() > this.connectorsStatus.get(connectorId)!.stopDate!) {
 298       return false;
 299     }
 300     if (this.chargingStation.inAcceptedState() === false) {
 301       logger.error(
 302         `${this.logPrefix(
 303           connectorId,
 304         )} entered in transaction loop while the charging station is not in accepted state`,
 305       );
 306       return false;
 307     }
 308     if (this.chargingStation.isChargingStationAvailable() === false) {
 309       logger.info(
 310         `${this.logPrefix(
 311           connectorId,
 312         )} entered in transaction loop while the charging station is unavailable`,
 313       );
 314       return false;
 315     }
 316     if (this.chargingStation.isConnectorAvailable(connectorId) === false) {
 317       logger.info(
 318         `${this.logPrefix(
 319           connectorId,
 320         )} entered in transaction loop while the connector ${connectorId} is unavailable`,
 321       );
 322       return false;
 323     }
 324     if (
 325       this.chargingStation.getConnectorStatus(connectorId)?.status ===
 326       ConnectorStatusEnum.Unavailable
 327     ) {
 328       logger.info(
 329         `${this.logPrefix(
 330           connectorId,
 331         )} entered in transaction loop while the connector ${connectorId} status is unavailable`,
 332       );
 333       return false;
 334     }
 335     return true;
 336   }
 337
 338   private initializeConnectorsStatus(): void {
 339     if (this.chargingStation.hasEvses) {
 340       for (const [evseId, evseStatus] of this.chargingStation.evses) {
 341         if (evseId > 0) {
 342           for (const connectorId of evseStatus.connectors.keys()) {
 343             this.connectorsStatus.set(connectorId, this.getConnectorStatus(connectorId));
 344           }
 345         }
 346       }
 347     } else {
 348       for (const connectorId of this.chargingStation.connectors.keys()) {
 349         if (connectorId > 0) {
 350           this.connectorsStatus.set(connectorId, this.getConnectorStatus(connectorId));
 351         }
 352       }
 353     }
 354   }
 355
 356   private getConnectorStatus(connectorId: number): Status {
 357     const connectorStatus = this.chargingStation.getAutomaticTransactionGeneratorStatuses()
 358       ? cloneObject<Status[]>(this.chargingStation.getAutomaticTransactionGeneratorStatuses()!)[
 359           connectorId
 360         ]
 361       : undefined;
 362     delete connectorStatus?.startDate;
 363     delete connectorStatus?.lastRunDate;
 364     delete connectorStatus?.stopDate;
 365     delete connectorStatus?.stoppedDate;
 366     return (
 367       connectorStatus ?? {
 368         start: false,
 369         authorizeRequests: 0,
 370         acceptedAuthorizeRequests: 0,
 371         rejectedAuthorizeRequests: 0,
 372         startTransactionRequests: 0,
 373         acceptedStartTransactionRequests: 0,
 374         rejectedStartTransactionRequests: 0,
 375         stopTransactionRequests: 0,
 376         acceptedStopTransactionRequests: 0,
 377         rejectedStopTransactionRequests: 0,
 378         skippedConsecutiveTransactions: 0,
 379         skippedTransactions: 0,
 380       }
 381     );
 382   }
 383
 384   private async startTransaction(
 385     connectorId: number,
 386   ): Promise<StartTransactionResponse | undefined> {
 387     const measureId = 'StartTransaction with ATG';
 388     const beginId = PerformanceStatistics.beginMeasure(measureId);
 389     let startResponse: StartTransactionResponse | undefined;
 390     if (this.chargingStation.hasIdTags()) {
 391       const idTag = IdTagsCache.getInstance().getIdTag(
 392         this.chargingStation.getAutomaticTransactionGeneratorConfiguration().idTagDistribution!,
 393         this.chargingStation,
 394         connectorId,
 395       );
 396       const startTransactionLogMsg = `${this.logPrefix(
 397         connectorId,
 398       )} start transaction with an idTag '${idTag}'`;
 399       if (this.getRequireAuthorize()) {
 400         this.chargingStation.getConnectorStatus(connectorId)!.authorizeIdTag = idTag;
 401         // Authorize idTag
 402         const authorizeResponse: AuthorizeResponse =
 403           await this.chargingStation.ocppRequestService.requestHandler<
 404             AuthorizeRequest,
 405             AuthorizeResponse
 406           >(this.chargingStation, RequestCommand.AUTHORIZE, {
 407             idTag,
 408           });
 409         ++this.connectorsStatus.get(connectorId)!.authorizeRequests!;
 410         if (authorizeResponse?.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
 411           ++this.connectorsStatus.get(connectorId)!.acceptedAuthorizeRequests!;
 412           logger.info(startTransactionLogMsg);
 413           // Start transaction
 414           startResponse = await this.chargingStation.ocppRequestService.requestHandler<
 415             StartTransactionRequest,
 416             StartTransactionResponse
 417           >(this.chargingStation, RequestCommand.START_TRANSACTION, {
 418             connectorId,
 419             idTag,
 420           });
 421           this.handleStartTransactionResponse(connectorId, startResponse);
 422           PerformanceStatistics.endMeasure(measureId, beginId);
 423           return startResponse;
 424         }
 425         ++this.connectorsStatus.get(connectorId)!.rejectedAuthorizeRequests!;
 426         PerformanceStatistics.endMeasure(measureId, beginId);
 427         return startResponse;
 428       }
 429       logger.info(startTransactionLogMsg);
 430       // Start transaction
 431       startResponse = await this.chargingStation.ocppRequestService.requestHandler<
 432         StartTransactionRequest,
 433         StartTransactionResponse
 434       >(this.chargingStation, RequestCommand.START_TRANSACTION, {
 435         connectorId,
 436         idTag,
 437       });
 438       this.handleStartTransactionResponse(connectorId, startResponse);
 439       PerformanceStatistics.endMeasure(measureId, beginId);
 440       return startResponse;
 441     }
 442     logger.info(`${this.logPrefix(connectorId)} start transaction without an idTag`);
 443     startResponse = await this.chargingStation.ocppRequestService.requestHandler<
 444       StartTransactionRequest,
 445       StartTransactionResponse
 446     >(this.chargingStation, RequestCommand.START_TRANSACTION, { connectorId });
 447     this.handleStartTransactionResponse(connectorId, startResponse);
 448     PerformanceStatistics.endMeasure(measureId, beginId);
 449     return startResponse;
 450   }
 451
 452   private async stopTransaction(
 453     connectorId: number,
 454     reason: StopTransactionReason = StopTransactionReason.LOCAL,
 455   ): Promise<StopTransactionResponse | undefined> {
 456     const measureId = 'StopTransaction with ATG';
 457     const beginId = PerformanceStatistics.beginMeasure(measureId);
 458     let stopResponse: StopTransactionResponse | undefined;
 459     if (this.chargingStation.getConnectorStatus(connectorId)?.transactionStarted === true) {
 460       stopResponse = await this.chargingStation.stopTransactionOnConnector(connectorId, reason);
 461       ++this.connectorsStatus.get(connectorId)!.stopTransactionRequests!;
 462       if (stopResponse?.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
 463         ++this.connectorsStatus.get(connectorId)!.acceptedStopTransactionRequests!;
 464       } else {
 465         ++this.connectorsStatus.get(connectorId)!.rejectedStopTransactionRequests!;
 466       }
 467     } else {
 468       const transactionId = this.chargingStation.getConnectorStatus(connectorId)?.transactionId;
 469       logger.warn(
 470         `${this.logPrefix(connectorId)} stopping a not started transaction${
 471           !isNullOrUndefined(transactionId) ? ` with id ${transactionId?.toString()}` : ''
 472         }`,
 473       );
 474     }
 475     PerformanceStatistics.endMeasure(measureId, beginId);
 476     return stopResponse;
 477   }
 478
 479   private getRequireAuthorize(): boolean {
 480     return (
 481       this.chargingStation.getAutomaticTransactionGeneratorConfiguration()?.requireAuthorize ?? true
 482     );
 483   }
 484
 485   private logPrefix = (connectorId?: number): string => {
 486     return logPrefix(
 487       ` ${this.chargingStation.stationInfo.chargingStationId} | ATG${
 488         !isNullOrUndefined(connectorId) ? ` on connector #${connectorId!.toString()}` : ''
 489       }:`,
 490     );
 491   };
 492
 493   private handleStartTransactionResponse(
 494     connectorId: number,
 495     startResponse: StartTransactionResponse,
 496   ): void {
 497     ++this.connectorsStatus.get(connectorId)!.startTransactionRequests!;
 498     if (startResponse?.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
 499       ++this.connectorsStatus.get(connectorId)!.acceptedStartTransactionRequests!;
 500     } else {
 501       logger.warn(`${this.logPrefix(connectorId)} start transaction rejected`);
 502       ++this.connectorsStatus.get(connectorId)!.rejectedStartTransactionRequests!;
 503     }
 504   }
 505 }