refactor: code cleanup

[e-mobility-charging-stations-simulator.git] / src / charging-station / AutomaticTransactionGenerator.ts

// Partial Copyright Jerome Benoit. 2021-2023. All Rights Reserved.

import { AsyncResource } from 'node:async_hooks';

import { hoursToMilliseconds, secondsToMilliseconds } from 'date-fns';

import type { ChargingStation } from './ChargingStation';
import { checkChargingStation } from './Helpers';
import { IdTagsCache } from './IdTagsCache';
import { BaseError } from '../exception';
import { PerformanceStatistics } from '../performance';
import {
  AuthorizationStatus,
  type AuthorizeRequest,
  type AuthorizeResponse,
  ConnectorStatusEnum,
  RequestCommand,
  type StartTransactionRequest,
  type StartTransactionResponse,
  type Status,
  StopTransactionReason,
  type StopTransactionResponse,
} from '../types';
import {
  Constants,
  cloneObject,
  formatDurationMilliSeconds,
  getRandomInteger,
  isNullOrUndefined,
  logPrefix,
  logger,
  secureRandom,
  sleep,
} from '../utils';

const moduleName = 'AutomaticTransactionGenerator';

export class AutomaticTransactionGenerator extends AsyncResource {
  private static readonly instances: Map<string, AutomaticTransactionGenerator> = new Map<
    string,
    AutomaticTransactionGenerator
  >();

  public readonly connectorsStatus: Map<number, Status>;
  public started: boolean;
  private starting: boolean;
  private stopping: boolean;
  private readonly chargingStation: ChargingStation;

  private constructor(chargingStation: ChargingStation) {
    super(moduleName);
    this.started = false;
    this.starting = false;
    this.stopping = false;
    this.chargingStation = chargingStation;
    this.connectorsStatus = new Map<number, Status>();
    this.initializeConnectorsStatus();
  }

  public static getInstance(
    chargingStation: ChargingStation,
  ): AutomaticTransactionGenerator | undefined {
    if (AutomaticTransactionGenerator.instances.has(chargingStation.stationInfo.hashId) === false) {
      AutomaticTransactionGenerator.instances.set(
        chargingStation.stationInfo.hashId,
        new AutomaticTransactionGenerator(chargingStation),
      );
    }
    return AutomaticTransactionGenerator.instances.get(chargingStation.stationInfo.hashId);
  }

  public start(): void {
    if (checkChargingStation(this.chargingStation, this.logPrefix()) === false) {
      return;
    }
    if (this.started === true) {
      logger.warn(`${this.logPrefix()} is already started`);
      return;
    }
    if (this.starting === true) {
      logger.warn(`${this.logPrefix()} is already starting`);
      return;
    }
    this.starting = true;
    this.startConnectors();
    this.started = true;
    this.starting = false;
  }

  public stop(): void {
    if (this.started === false) {
      logger.warn(`${this.logPrefix()} is already stopped`);
      return;
    }
    if (this.stopping === true) {
      logger.warn(`${this.logPrefix()} is already stopping`);
      return;
    }
    this.stopping = true;
    this.stopConnectors();
    this.started = false;
    this.stopping = false;
  }

  public startConnector(connectorId: number): void {
    if (checkChargingStation(this.chargingStation, this.logPrefix(connectorId)) === false) {
      return;
    }
    if (this.connectorsStatus.has(connectorId) === false) {
      logger.error(`${this.logPrefix(connectorId)} starting on non existing connector`);
      throw new BaseError(`Connector ${connectorId} does not exist`);
    }
    if (this.connectorsStatus.get(connectorId)?.start === false) {
      this.runInAsyncScope(
        this.internalStartConnector.bind(this) as (
          this: AutomaticTransactionGenerator,
          ...args: unknown[]
        ) => Promise<void>,
        this,
        connectorId,
      ).catch(Constants.EMPTY_FUNCTION);
    } else if (this.connectorsStatus.get(connectorId)?.start === true) {
      logger.warn(`${this.logPrefix(connectorId)} is already started on connector`);
    }
  }

  public stopConnector(connectorId: number): void {
    if (this.connectorsStatus.has(connectorId) === false) {
      logger.error(`${this.logPrefix(connectorId)} stopping on non existing connector`);
      throw new BaseError(`Connector ${connectorId} does not exist`);
    }
    if (this.connectorsStatus.get(connectorId)?.start === true) {
      this.connectorsStatus.get(connectorId)!.start = false;
    } else if (this.connectorsStatus.get(connectorId)?.start === false) {
      logger.warn(`${this.logPrefix(connectorId)} is already stopped on connector`);
    }
  }

  private startConnectors(): void {
    if (
      this.connectorsStatus?.size > 0 &&
      this.connectorsStatus.size !== this.chargingStation.getNumberOfConnectors()
    ) {
      this.connectorsStatus.clear();
      this.initializeConnectorsStatus();
    }
    if (this.chargingStation.hasEvses) {
      for (const [evseId, evseStatus] of this.chargingStation.evses) {
        if (evseId > 0) {
          for (const connectorId of evseStatus.connectors.keys()) {
            this.startConnector(connectorId);
          }
        }
      }
    } else {
      for (const connectorId of this.chargingStation.connectors.keys()) {
        if (connectorId > 0) {
          this.startConnector(connectorId);
        }
      }
    }
  }

  private stopConnectors(): void {
    if (this.chargingStation.hasEvses) {
      for (const [evseId, evseStatus] of this.chargingStation.evses) {
        if (evseId > 0) {
          for (const connectorId of evseStatus.connectors.keys()) {
            this.stopConnector(connectorId);
          }
        }
      }
    } else {
      for (const connectorId of this.chargingStation.connectors.keys()) {
        if (connectorId > 0) {
          this.stopConnector(connectorId);
        }
      }
    }
  }

  private async internalStartConnector(connectorId: number): Promise<void> {
    this.setStartConnectorStatus(connectorId);
    logger.info(
      `${this.logPrefix(
        connectorId,
      )} started on connector and will run for ${formatDurationMilliSeconds(
        this.connectorsStatus.get(connectorId)!.stopDate!.getTime() -
          this.connectorsStatus.get(connectorId)!.startDate!.getTime(),
      )}`,
    );
    while (this.connectorsStatus.get(connectorId)?.start === true) {
      if (!this.canStartConnector(connectorId)) {
        this.stopConnector(connectorId);
        break;
      }
      if (!this.chargingStation?.ocppRequestService) {
        logger.info(
          `${this.logPrefix(
            connectorId,
          )} transaction loop waiting for charging station service to be initialized`,
        );
        do {
          await sleep(Constants.CHARGING_STATION_ATG_INITIALIZATION_TIME);
        } while (!this.chargingStation?.ocppRequestService);
      }
      const wait = secondsToMilliseconds(
        getRandomInteger(
          this.chargingStation.getAutomaticTransactionGeneratorConfiguration()
            .maxDelayBetweenTwoTransactions,
          this.chargingStation.getAutomaticTransactionGeneratorConfiguration()
            .minDelayBetweenTwoTransactions,
        ),
      );
      logger.info(`${this.logPrefix(connectorId)} waiting for ${formatDurationMilliSeconds(wait)}`);
      await sleep(wait);
      const start = secureRandom();
      if (
        start <
        this.chargingStation.getAutomaticTransactionGeneratorConfiguration().probabilityOfStart
      ) {
        this.connectorsStatus.get(connectorId)!.skippedConsecutiveTransactions = 0;
        // Start transaction
        const startResponse = await this.startTransaction(connectorId);
        if (startResponse?.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
          // Wait until end of transaction
          const waitTrxEnd = secondsToMilliseconds(
            getRandomInteger(
              this.chargingStation.getAutomaticTransactionGeneratorConfiguration().maxDuration,
              this.chargingStation.getAutomaticTransactionGeneratorConfiguration().minDuration,
            ),
          );
          logger.info(
            `${this.logPrefix(connectorId)} transaction started with id ${this.chargingStation
              .getConnectorStatus(connectorId)
              ?.transactionId?.toString()} and will stop in ${formatDurationMilliSeconds(
              waitTrxEnd,
            )}`,
          );
          await sleep(waitTrxEnd);
          // Stop transaction
          logger.info(
            `${this.logPrefix(connectorId)} stop transaction with id ${this.chargingStation
              .getConnectorStatus(connectorId)
              ?.transactionId?.toString()}`,
          );
          await this.stopTransaction(connectorId);
        }
      } else {
        ++this.connectorsStatus.get(connectorId)!.skippedConsecutiveTransactions!;
        ++this.connectorsStatus.get(connectorId)!.skippedTransactions!;
        logger.info(
          `${this.logPrefix(connectorId)} skipped consecutively ${this.connectorsStatus
            .get(connectorId)
            ?.skippedConsecutiveTransactions?.toString()}/${this.connectorsStatus
            .get(connectorId)
            ?.skippedTransactions?.toString()} transaction(s)`,
        );
      }
      this.connectorsStatus.get(connectorId)!.lastRunDate = new Date();
    }
    this.connectorsStatus.get(connectorId)!.stoppedDate = new Date();
    logger.info(
      `${this.logPrefix(
        connectorId,
      )} stopped on connector and lasted for ${formatDurationMilliSeconds(
        this.connectorsStatus.get(connectorId)!.stoppedDate!.getTime() -
          this.connectorsStatus.get(connectorId)!.startDate!.getTime(),
      )}`,
    );
    logger.debug(
      `${this.logPrefix(connectorId)} connector status: %j`,
      this.connectorsStatus.get(connectorId),
    );
  }

  private setStartConnectorStatus(connectorId: number): void {
    this.connectorsStatus.get(connectorId)!.skippedConsecutiveTransactions = 0;
    const previousRunDuration =
      this.connectorsStatus.get(connectorId)?.startDate &&
      this.connectorsStatus.get(connectorId)?.lastRunDate
        ? this.connectorsStatus.get(connectorId)!.lastRunDate!.getTime() -
          this.connectorsStatus.get(connectorId)!.startDate!.getTime()
        : 0;
    this.connectorsStatus.get(connectorId)!.startDate = new Date();
    this.connectorsStatus.get(connectorId)!.stopDate = new Date(
      this.connectorsStatus.get(connectorId)!.startDate!.getTime() +
        hoursToMilliseconds(
          this.chargingStation.getAutomaticTransactionGeneratorConfiguration().stopAfterHours,
        ) -
        previousRunDuration,
    );
    this.connectorsStatus.get(connectorId)!.start = true;
  }

  private canStartConnector(connectorId: number): boolean {
    if (new Date() > this.connectorsStatus.get(connectorId)!.stopDate!) {
      return false;
    }
    if (this.chargingStation.inAcceptedState() === false) {
      logger.error(
        `${this.logPrefix(
          connectorId,
        )} entered in transaction loop while the charging station is not in accepted state`,
      );
      return false;
    }
    if (this.chargingStation.isChargingStationAvailable() === false) {
      logger.info(
        `${this.logPrefix(
          connectorId,
        )} entered in transaction loop while the charging station is unavailable`,
      );
      return false;
    }
    if (this.chargingStation.isConnectorAvailable(connectorId) === false) {
      logger.info(
        `${this.logPrefix(
          connectorId,
        )} entered in transaction loop while the connector ${connectorId} is unavailable`,
      );
      return false;
    }
    if (
      this.chargingStation.getConnectorStatus(connectorId)?.status ===
      ConnectorStatusEnum.Unavailable
    ) {
      logger.info(
        `${this.logPrefix(
          connectorId,
        )} entered in transaction loop while the connector ${connectorId} status is unavailable`,
      );
      return false;
    }
    return true;
  }

  private initializeConnectorsStatus(): void {
    if (this.chargingStation.hasEvses) {
      for (const [evseId, evseStatus] of this.chargingStation.evses) {
        if (evseId > 0) {
          for (const connectorId of evseStatus.connectors.keys()) {
            this.connectorsStatus.set(connectorId, this.getConnectorStatus(connectorId));
          }
        }
      }
    } else {
      for (const connectorId of this.chargingStation.connectors.keys()) {
        if (connectorId > 0) {
          this.connectorsStatus.set(connectorId, this.getConnectorStatus(connectorId));
        }
      }
    }
  }

  private getConnectorStatus(connectorId: number): Status {
    const connectorStatus = this.chargingStation.getAutomaticTransactionGeneratorStatuses()
      ? cloneObject<Status[]>(this.chargingStation.getAutomaticTransactionGeneratorStatuses()!)[
          connectorId
        ]
      : undefined;
    delete connectorStatus?.startDate;
    delete connectorStatus?.lastRunDate;
    delete connectorStatus?.stopDate;
    delete connectorStatus?.stoppedDate;
    return (
      connectorStatus ?? {
        start: false,
        authorizeRequests: 0,
        acceptedAuthorizeRequests: 0,
        rejectedAuthorizeRequests: 0,
        startTransactionRequests: 0,
        acceptedStartTransactionRequests: 0,
        rejectedStartTransactionRequests: 0,
        stopTransactionRequests: 0,
        acceptedStopTransactionRequests: 0,
        rejectedStopTransactionRequests: 0,
        skippedConsecutiveTransactions: 0,
        skippedTransactions: 0,
      }
    );
  }

  private async startTransaction(
    connectorId: number,
  ): Promise<StartTransactionResponse | undefined> {
    const measureId = 'StartTransaction with ATG';
    const beginId = PerformanceStatistics.beginMeasure(measureId);
    let startResponse: StartTransactionResponse | undefined;
    if (this.chargingStation.hasIdTags()) {
      const idTag = IdTagsCache.getInstance().getIdTag(
        this.chargingStation.getAutomaticTransactionGeneratorConfiguration().idTagDistribution!,
        this.chargingStation,
        connectorId,
      );
      const startTransactionLogMsg = `${this.logPrefix(
        connectorId,
      )} start transaction with an idTag '${idTag}'`;
      if (this.getRequireAuthorize()) {
        // Authorize idTag
        const authorizeResponse: AuthorizeResponse =
          await this.chargingStation.ocppRequestService.requestHandler<
            AuthorizeRequest,
            AuthorizeResponse
          >(this.chargingStation, RequestCommand.AUTHORIZE, {
            idTag,
          });
        ++this.connectorsStatus.get(connectorId)!.authorizeRequests!;
        if (authorizeResponse?.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
          if (
            isNullOrUndefined(this.chargingStation.getConnectorStatus(connectorId)?.authorizeIdTag)
          ) {
            logger.warn(
              `${this.chargingStation.logPrefix()} IdTag ${idTag} is not set as authorized remotely, applying deferred initialization`,
            );
            this.chargingStation.getConnectorStatus(connectorId)!.authorizeIdTag = idTag;
          }
          ++this.connectorsStatus.get(connectorId)!.acceptedAuthorizeRequests!;
          logger.info(startTransactionLogMsg);
          // Start transaction
          startResponse = await this.chargingStation.ocppRequestService.requestHandler<
            StartTransactionRequest,
            StartTransactionResponse
          >(this.chargingStation, RequestCommand.START_TRANSACTION, {
            connectorId,
            idTag,
          });
          this.handleStartTransactionResponse(connectorId, startResponse);
          PerformanceStatistics.endMeasure(measureId, beginId);
          return startResponse;
        }
        ++this.connectorsStatus.get(connectorId)!.rejectedAuthorizeRequests!;
        PerformanceStatistics.endMeasure(measureId, beginId);
        return startResponse;
      }
      logger.info(startTransactionLogMsg);
      // Start transaction
      startResponse = await this.chargingStation.ocppRequestService.requestHandler<
        StartTransactionRequest,
        StartTransactionResponse
      >(this.chargingStation, RequestCommand.START_TRANSACTION, {
        connectorId,
        idTag,
      });
      this.handleStartTransactionResponse(connectorId, startResponse);
      PerformanceStatistics.endMeasure(measureId, beginId);
      return startResponse;
    }
    logger.info(`${this.logPrefix(connectorId)} start transaction without an idTag`);
    startResponse = await this.chargingStation.ocppRequestService.requestHandler<
      StartTransactionRequest,
      StartTransactionResponse
    >(this.chargingStation, RequestCommand.START_TRANSACTION, { connectorId });
    this.handleStartTransactionResponse(connectorId, startResponse);
    PerformanceStatistics.endMeasure(measureId, beginId);
    return startResponse;
  }

  private async stopTransaction(
    connectorId: number,
    reason: StopTransactionReason = StopTransactionReason.LOCAL,
  ): Promise<StopTransactionResponse | undefined> {
    const measureId = 'StopTransaction with ATG';
    const beginId = PerformanceStatistics.beginMeasure(measureId);
    let stopResponse: StopTransactionResponse | undefined;
    if (this.chargingStation.getConnectorStatus(connectorId)?.transactionStarted === true) {
      stopResponse = await this.chargingStation.stopTransactionOnConnector(connectorId, reason);
      ++this.connectorsStatus.get(connectorId)!.stopTransactionRequests!;
      if (stopResponse?.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
        ++this.connectorsStatus.get(connectorId)!.acceptedStopTransactionRequests!;
      } else {
        ++this.connectorsStatus.get(connectorId)!.rejectedStopTransactionRequests!;
      }
    } else {
      const transactionId = this.chargingStation.getConnectorStatus(connectorId)?.transactionId;
      logger.warn(
        `${this.logPrefix(connectorId)} stopping a not started transaction${
          !isNullOrUndefined(transactionId) ? ` with id ${transactionId?.toString()}` : ''
        }`,
      );
    }
    PerformanceStatistics.endMeasure(measureId, beginId);
    return stopResponse;
  }

  private getRequireAuthorize(): boolean {
    return (
      this.chargingStation.getAutomaticTransactionGeneratorConfiguration()?.requireAuthorize ?? true
    );
  }

  private logPrefix = (connectorId?: number): string => {
    return logPrefix(
      ` ${this.chargingStation.stationInfo.chargingStationId} | ATG${
        !isNullOrUndefined(connectorId) ? ` on connector #${connectorId!.toString()}` : ''
      }:`,
    );
  };

  private handleStartTransactionResponse(
    connectorId: number,
    startResponse: StartTransactionResponse,
  ): void {
    ++this.connectorsStatus.get(connectorId)!.startTransactionRequests!;
    if (startResponse?.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
      ++this.connectorsStatus.get(connectorId)!.acceptedStartTransactionRequests!;
    } else {
      logger.warn(`${this.logPrefix(connectorId)} start transaction rejected`);
      ++this.connectorsStatus.get(connectorId)!.rejectedStartTransactionRequests!;
    }
  }
}