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 { checkChargingStation } from './Helpers';
   9 import { IdTagsCache } from './IdTagsCache';
  10 import { OCPPServiceUtils } from './ocpp';
  11 import { BaseError } from '../exception';
  12 import { PerformanceStatistics } from '../performance';
  13 import {
  14   AuthorizationStatus,
  15   RequestCommand,
  16   type StartTransactionRequest,
  17   type StartTransactionResponse,
  18   type Status,
  19   StopTransactionReason,
  20   type StopTransactionResponse,
  21 } from '../types';
  22 import {
  23   Constants,
  24   cloneObject,
  25   formatDurationMilliSeconds,
  26   getRandomInteger,
  27   isNullOrUndefined,
  28   logPrefix,
  29   logger,
  30   secureRandom,
  31   sleep,
  32 } from '../utils';
  33
  34 const moduleName = 'AutomaticTransactionGenerator';
  35
  36 export class AutomaticTransactionGenerator extends AsyncResource {
  37   private static readonly instances: Map<string, AutomaticTransactionGenerator> = new Map<
  38     string,
  39     AutomaticTransactionGenerator
  40   >();
  41
  42   public readonly connectorsStatus: Map<number, Status>;
  43   public started: boolean;
  44   private starting: boolean;
  45   private stopping: boolean;
  46   private readonly chargingStation: ChargingStation;
  47
  48   private constructor(chargingStation: ChargingStation) {
  49     super(moduleName);
  50     this.started = false;
  51     this.starting = false;
  52     this.stopping = false;
  53     this.chargingStation = chargingStation;
  54     this.connectorsStatus = new Map<number, Status>();
  55     this.initializeConnectorsStatus();
  56   }
  57
  58   public static getInstance(
  59     chargingStation: ChargingStation,
  60   ): AutomaticTransactionGenerator | undefined {
  61     if (AutomaticTransactionGenerator.instances.has(chargingStation.stationInfo.hashId) === false) {
  62       AutomaticTransactionGenerator.instances.set(
  63         chargingStation.stationInfo.hashId,
  64         new AutomaticTransactionGenerator(chargingStation),
  65       );
  66     }
  67     return AutomaticTransactionGenerator.instances.get(chargingStation.stationInfo.hashId);
  68   }
  69
  70   public start(): void {
  71     if (checkChargingStation(this.chargingStation, this.logPrefix()) === false) {
  72       return;
  73     }
  74     if (this.started === true) {
  75       logger.warn(`${this.logPrefix()} is already started`);
  76       return;
  77     }
  78     if (this.starting === true) {
  79       logger.warn(`${this.logPrefix()} is already starting`);
  80       return;
  81     }
  82     this.starting = true;
  83     this.startConnectors();
  84     this.started = true;
  85     this.starting = false;
  86   }
  87
  88   public stop(): void {
  89     if (this.started === false) {
  90       logger.warn(`${this.logPrefix()} is already stopped`);
  91       return;
  92     }
  93     if (this.stopping === true) {
  94       logger.warn(`${this.logPrefix()} is already stopping`);
  95       return;
  96     }
  97     this.stopping = true;
  98     this.stopConnectors();
  99     this.started = false;
 100     this.stopping = false;
 101   }
 102
 103   public startConnector(connectorId: number): void {
 104     if (checkChargingStation(this.chargingStation, this.logPrefix(connectorId)) === false) {
 105       return;
 106     }
 107     if (this.connectorsStatus.has(connectorId) === false) {
 108       logger.error(`${this.logPrefix(connectorId)} starting on non existing connector`);
 109       throw new BaseError(`Connector ${connectorId} does not exist`);
 110     }
 111     if (this.connectorsStatus.get(connectorId)?.start === false) {
 112       this.runInAsyncScope(
 113         this.internalStartConnector.bind(this) as (
 114           this: AutomaticTransactionGenerator,
 115           ...args: unknown[]
 116         ) => Promise<void>,
 117         this,
 118         connectorId,
 119       ).catch(Constants.EMPTY_FUNCTION);
 120     } else if (this.connectorsStatus.get(connectorId)?.start === true) {
 121       logger.warn(`${this.logPrefix(connectorId)} is already started on connector`);
 122     }
 123   }
 124
 125   public stopConnector(connectorId: number): void {
 126     if (this.connectorsStatus.has(connectorId) === false) {
 127       logger.error(`${this.logPrefix(connectorId)} stopping on non existing connector`);
 128       throw new BaseError(`Connector ${connectorId} does not exist`);
 129     }
 130     if (this.connectorsStatus.get(connectorId)?.start === true) {
 131       this.connectorsStatus.get(connectorId)!.start = false;
 132     } else if (this.connectorsStatus.get(connectorId)?.start === false) {
 133       logger.warn(`${this.logPrefix(connectorId)} is already stopped on connector`);
 134     }
 135   }
 136
 137   private startConnectors(): void {
 138     if (
 139       this.connectorsStatus?.size > 0 &&
 140       this.connectorsStatus.size !== this.chargingStation.getNumberOfConnectors()
 141     ) {
 142       this.connectorsStatus.clear();
 143       this.initializeConnectorsStatus();
 144     }
 145     if (this.chargingStation.hasEvses) {
 146       for (const [evseId, evseStatus] of this.chargingStation.evses) {
 147         if (evseId > 0) {
 148           for (const connectorId of evseStatus.connectors.keys()) {
 149             this.startConnector(connectorId);
 150           }
 151         }
 152       }
 153     } else {
 154       for (const connectorId of this.chargingStation.connectors.keys()) {
 155         if (connectorId > 0) {
 156           this.startConnector(connectorId);
 157         }
 158       }
 159     }
 160   }
 161
 162   private stopConnectors(): void {
 163     if (this.chargingStation.hasEvses) {
 164       for (const [evseId, evseStatus] of this.chargingStation.evses) {
 165         if (evseId > 0) {
 166           for (const connectorId of evseStatus.connectors.keys()) {
 167             this.stopConnector(connectorId);
 168           }
 169         }
 170       }
 171     } else {
 172       for (const connectorId of this.chargingStation.connectors.keys()) {
 173         if (connectorId > 0) {
 174           this.stopConnector(connectorId);
 175         }
 176       }
 177     }
 178   }
 179
 180   private async internalStartConnector(connectorId: number): Promise<void> {
 181     this.setStartConnectorStatus(connectorId);
 182     logger.info(
 183       `${this.logPrefix(
 184         connectorId,
 185       )} started on connector and will run for ${formatDurationMilliSeconds(
 186         this.connectorsStatus.get(connectorId)!.stopDate!.getTime() -
 187           this.connectorsStatus.get(connectorId)!.startDate!.getTime(),
 188       )}`,
 189     );
 190     while (this.connectorsStatus.get(connectorId)?.start === true) {
 191       await this.waitChargingStationServiceInitialization(connectorId);
 192       await this.waitChargingStationAvailable(connectorId);
 193       await this.waitConnectorAvailable(connectorId);
 194       if (!this.canStartConnector(connectorId)) {
 195         this.stopConnector(connectorId);
 196         break;
 197       }
 198       const wait = secondsToMilliseconds(
 199         getRandomInteger(
 200           this.chargingStation.getAutomaticTransactionGeneratorConfiguration()
 201             .maxDelayBetweenTwoTransactions,
 202           this.chargingStation.getAutomaticTransactionGeneratorConfiguration()
 203             .minDelayBetweenTwoTransactions,
 204         ),
 205       );
 206       logger.info(`${this.logPrefix(connectorId)} waiting for ${formatDurationMilliSeconds(wait)}`);
 207       await sleep(wait);
 208       const start = secureRandom();
 209       if (
 210         start <
 211         this.chargingStation.getAutomaticTransactionGeneratorConfiguration().probabilityOfStart
 212       ) {
 213         this.connectorsStatus.get(connectorId)!.skippedConsecutiveTransactions = 0;
 214         // Start transaction
 215         const startResponse = await this.startTransaction(connectorId);
 216         if (startResponse?.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
 217           // Wait until end of transaction
 218           const waitTrxEnd = secondsToMilliseconds(
 219             getRandomInteger(
 220               this.chargingStation.getAutomaticTransactionGeneratorConfiguration().maxDuration,
 221               this.chargingStation.getAutomaticTransactionGeneratorConfiguration().minDuration,
 222             ),
 223           );
 224           logger.info(
 225             `${this.logPrefix(
 226               connectorId,
 227             )} transaction started with id ${this.chargingStation.getConnectorStatus(connectorId)
 228               ?.transactionId} and will stop in ${formatDurationMilliSeconds(waitTrxEnd)}`,
 229           );
 230           await sleep(waitTrxEnd);
 231           await this.stopTransaction(connectorId);
 232         }
 233       } else {
 234         ++this.connectorsStatus.get(connectorId)!.skippedConsecutiveTransactions!;
 235         ++this.connectorsStatus.get(connectorId)!.skippedTransactions!;
 236         logger.info(
 237           `${this.logPrefix(connectorId)} skipped consecutively ${this.connectorsStatus.get(
 238             connectorId,
 239           )?.skippedConsecutiveTransactions}/${this.connectorsStatus.get(connectorId)
 240             ?.skippedTransactions} transaction(s)`,
 241         );
 242       }
 243       this.connectorsStatus.get(connectorId)!.lastRunDate = new Date();
 244     }
 245     this.connectorsStatus.get(connectorId)!.stoppedDate = new Date();
 246     logger.info(
 247       `${this.logPrefix(
 248         connectorId,
 249       )} stopped on connector and lasted for ${formatDurationMilliSeconds(
 250         this.connectorsStatus.get(connectorId)!.stoppedDate!.getTime() -
 251           this.connectorsStatus.get(connectorId)!.startDate!.getTime(),
 252       )}`,
 253     );
 254     logger.debug(
 255       `${this.logPrefix(connectorId)} connector status: %j`,
 256       this.connectorsStatus.get(connectorId),
 257     );
 258   }
 259
 260   private setStartConnectorStatus(connectorId: number): void {
 261     this.connectorsStatus.get(connectorId)!.skippedConsecutiveTransactions = 0;
 262     const previousRunDuration =
 263       this.connectorsStatus.get(connectorId)?.startDate &&
 264       this.connectorsStatus.get(connectorId)?.lastRunDate
 265         ? this.connectorsStatus.get(connectorId)!.lastRunDate!.getTime() -
 266           this.connectorsStatus.get(connectorId)!.startDate!.getTime()
 267         : 0;
 268     this.connectorsStatus.get(connectorId)!.startDate = new Date();
 269     this.connectorsStatus.get(connectorId)!.stopDate = new Date(
 270       this.connectorsStatus.get(connectorId)!.startDate!.getTime() +
 271         hoursToMilliseconds(
 272           this.chargingStation.getAutomaticTransactionGeneratorConfiguration().stopAfterHours,
 273         ) -
 274         previousRunDuration,
 275     );
 276     this.connectorsStatus.get(connectorId)!.start = true;
 277   }
 278
 279   private canStartConnector(connectorId: number): boolean {
 280     if (new Date() > this.connectorsStatus.get(connectorId)!.stopDate!) {
 281       return false;
 282     }
 283     if (this.chargingStation.inAcceptedState() === false) {
 284       logger.error(
 285         `${this.logPrefix(
 286           connectorId,
 287         )} entered in transaction loop while the charging station is not in accepted state`,
 288       );
 289       return false;
 290     }
 291     if (this.chargingStation.isChargingStationAvailable() === false) {
 292       logger.info(
 293         `${this.logPrefix(
 294           connectorId,
 295         )} entered in transaction loop while the charging station is unavailable`,
 296       );
 297       return false;
 298     }
 299     if (this.chargingStation.isConnectorAvailable(connectorId) === false) {
 300       logger.info(
 301         `${this.logPrefix(
 302           connectorId,
 303         )} entered in transaction loop while the connector ${connectorId} is unavailable`,
 304       );
 305       return false;
 306     }
 307     return true;
 308   }
 309
 310   private async waitChargingStationServiceInitialization(connectorId: number): Promise<void> {
 311     let logged = false;
 312     while (!this.chargingStation?.ocppRequestService) {
 313       if (!logged) {
 314         logger.info(
 315           `${this.logPrefix(
 316             connectorId,
 317           )} transaction loop waiting for charging station service to be initialized`,
 318         );
 319         logged = true;
 320       }
 321       await sleep(Constants.CHARGING_STATION_ATG_INITIALIZATION_TIME);
 322     }
 323   }
 324
 325   private async waitChargingStationAvailable(connectorId: number): Promise<void> {
 326     let logged = false;
 327     while (!this.chargingStation.isChargingStationAvailable()) {
 328       if (!logged) {
 329         logger.info(
 330           `${this.logPrefix(
 331             connectorId,
 332           )} transaction loop waiting for charging station to be available`,
 333         );
 334         logged = true;
 335       }
 336       await sleep(Constants.CHARGING_STATION_ATG_AVAILABILITY_TIME);
 337     }
 338   }
 339
 340   private async waitConnectorAvailable(connectorId: number): Promise<void> {
 341     let logged = false;
 342     while (!this.chargingStation.isConnectorAvailable(connectorId)) {
 343       if (!logged) {
 344         logger.info(
 345           `${this.logPrefix(
 346             connectorId,
 347           )} transaction loop waiting for connector ${connectorId} to be available`,
 348         );
 349         logged = true;
 350       }
 351       await sleep(Constants.CHARGING_STATION_ATG_AVAILABILITY_TIME);
 352     }
 353   }
 354
 355   private initializeConnectorsStatus(): void {
 356     if (this.chargingStation.hasEvses) {
 357       for (const [evseId, evseStatus] of this.chargingStation.evses) {
 358         if (evseId > 0) {
 359           for (const connectorId of evseStatus.connectors.keys()) {
 360             this.connectorsStatus.set(connectorId, this.getConnectorStatus(connectorId));
 361           }
 362         }
 363       }
 364     } else {
 365       for (const connectorId of this.chargingStation.connectors.keys()) {
 366         if (connectorId > 0) {
 367           this.connectorsStatus.set(connectorId, this.getConnectorStatus(connectorId));
 368         }
 369       }
 370     }
 371   }
 372
 373   private getConnectorStatus(connectorId: number): Status {
 374     const connectorStatus = this.chargingStation.getAutomaticTransactionGeneratorStatuses()?.[
 375       connectorId
 376     ]
 377       ? cloneObject<Status>(
 378           this.chargingStation.getAutomaticTransactionGeneratorStatuses()![connectorId],
 379         )
 380       : undefined;
 381     this.resetConnectorStatus(connectorStatus);
 382     return (
 383       connectorStatus ?? {
 384         start: false,
 385         authorizeRequests: 0,
 386         acceptedAuthorizeRequests: 0,
 387         rejectedAuthorizeRequests: 0,
 388         startTransactionRequests: 0,
 389         acceptedStartTransactionRequests: 0,
 390         rejectedStartTransactionRequests: 0,
 391         stopTransactionRequests: 0,
 392         acceptedStopTransactionRequests: 0,
 393         rejectedStopTransactionRequests: 0,
 394         skippedConsecutiveTransactions: 0,
 395         skippedTransactions: 0,
 396       }
 397     );
 398   }
 399
 400   private resetConnectorStatus(connectorStatus: Status | undefined): void {
 401     delete connectorStatus?.startDate;
 402     delete connectorStatus?.lastRunDate;
 403     delete connectorStatus?.stopDate;
 404     delete connectorStatus?.stoppedDate;
 405     if (
 406       !this.started &&
 407       (connectorStatus?.start === true ||
 408         this.chargingStation.getAutomaticTransactionGeneratorConfiguration().enable === false)
 409     ) {
 410       connectorStatus!.start = false;
 411     }
 412   }
 413
 414   private async startTransaction(
 415     connectorId: number,
 416   ): Promise<StartTransactionResponse | undefined> {
 417     const measureId = 'StartTransaction with ATG';
 418     const beginId = PerformanceStatistics.beginMeasure(measureId);
 419     let startResponse: StartTransactionResponse | undefined;
 420     if (this.chargingStation.hasIdTags()) {
 421       const idTag = IdTagsCache.getInstance().getIdTag(
 422         this.chargingStation.getAutomaticTransactionGeneratorConfiguration().idTagDistribution!,
 423         this.chargingStation,
 424         connectorId,
 425       );
 426       const startTransactionLogMsg = `${this.logPrefix(
 427         connectorId,
 428       )} start transaction with an idTag '${idTag}'`;
 429       if (this.getRequireAuthorize()) {
 430         ++this.connectorsStatus.get(connectorId)!.authorizeRequests!;
 431         if (await OCPPServiceUtils.isIdTagAuthorized(this.chargingStation, connectorId, idTag)) {
 432           ++this.connectorsStatus.get(connectorId)!.acceptedAuthorizeRequests!;
 433           logger.info(startTransactionLogMsg);
 434           // Start transaction
 435           startResponse = await this.chargingStation.ocppRequestService.requestHandler<
 436             StartTransactionRequest,
 437             StartTransactionResponse
 438           >(this.chargingStation, RequestCommand.START_TRANSACTION, {
 439             connectorId,
 440             idTag,
 441           });
 442           this.handleStartTransactionResponse(connectorId, startResponse);
 443           PerformanceStatistics.endMeasure(measureId, beginId);
 444           return startResponse;
 445         }
 446         ++this.connectorsStatus.get(connectorId)!.rejectedAuthorizeRequests!;
 447         PerformanceStatistics.endMeasure(measureId, beginId);
 448         return startResponse;
 449       }
 450       logger.info(startTransactionLogMsg);
 451       // Start transaction
 452       startResponse = await this.chargingStation.ocppRequestService.requestHandler<
 453         StartTransactionRequest,
 454         StartTransactionResponse
 455       >(this.chargingStation, RequestCommand.START_TRANSACTION, {
 456         connectorId,
 457         idTag,
 458       });
 459       this.handleStartTransactionResponse(connectorId, startResponse);
 460       PerformanceStatistics.endMeasure(measureId, beginId);
 461       return startResponse;
 462     }
 463     logger.info(`${this.logPrefix(connectorId)} start transaction without an idTag`);
 464     startResponse = await this.chargingStation.ocppRequestService.requestHandler<
 465       StartTransactionRequest,
 466       StartTransactionResponse
 467     >(this.chargingStation, RequestCommand.START_TRANSACTION, { connectorId });
 468     this.handleStartTransactionResponse(connectorId, startResponse);
 469     PerformanceStatistics.endMeasure(measureId, beginId);
 470     return startResponse;
 471   }
 472
 473   private async stopTransaction(
 474     connectorId: number,
 475     reason = StopTransactionReason.LOCAL,
 476   ): Promise<StopTransactionResponse | undefined> {
 477     const measureId = 'StopTransaction with ATG';
 478     const beginId = PerformanceStatistics.beginMeasure(measureId);
 479     let stopResponse: StopTransactionResponse | undefined;
 480     if (this.chargingStation.getConnectorStatus(connectorId)?.transactionStarted === true) {
 481       logger.info(
 482         `${this.logPrefix(
 483           connectorId,
 484         )} stop transaction with id ${this.chargingStation.getConnectorStatus(connectorId)
 485           ?.transactionId}`,
 486       );
 487       stopResponse = await this.chargingStation.stopTransactionOnConnector(connectorId, reason);
 488       ++this.connectorsStatus.get(connectorId)!.stopTransactionRequests!;
 489       if (stopResponse?.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
 490         ++this.connectorsStatus.get(connectorId)!.acceptedStopTransactionRequests!;
 491       } else {
 492         ++this.connectorsStatus.get(connectorId)!.rejectedStopTransactionRequests!;
 493       }
 494     } else {
 495       const transactionId = this.chargingStation.getConnectorStatus(connectorId)?.transactionId;
 496       logger.debug(
 497         `${this.logPrefix(connectorId)} stopping a not started transaction${
 498           !isNullOrUndefined(transactionId) ? ` with id ${transactionId}` : ''
 499         }`,
 500       );
 501     }
 502     PerformanceStatistics.endMeasure(measureId, beginId);
 503     return stopResponse;
 504   }
 505
 506   private getRequireAuthorize(): boolean {
 507     return (
 508       this.chargingStation.getAutomaticTransactionGeneratorConfiguration()?.requireAuthorize ?? true
 509     );
 510   }
 511
 512   private logPrefix = (connectorId?: number): string => {
 513     return logPrefix(
 514       ` ${this.chargingStation.stationInfo.chargingStationId} | ATG${
 515         !isNullOrUndefined(connectorId) ? ` on connector #${connectorId}` : ''
 516       }:`,
 517     );
 518   };
 519
 520   private handleStartTransactionResponse(
 521     connectorId: number,
 522     startResponse: StartTransactionResponse,
 523   ): void {
 524     ++this.connectorsStatus.get(connectorId)!.startTransactionRequests!;
 525     if (startResponse?.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
 526       ++this.connectorsStatus.get(connectorId)!.acceptedStartTransactionRequests!;
 527     } else {
 528       logger.warn(`${this.logPrefix(connectorId)} start transaction rejected`);
 529       ++this.connectorsStatus.get(connectorId)!.rejectedStartTransactionRequests!;
 530     }
 531   }
 532 }