refactor(simulator): factor out common helpers

[e-mobility-charging-stations-simulator.git] / src / charging-station / ui-server / ui-services / AbstractUIService.ts

import { BaseError, type OCPPError } from '../../../exception';
import {
  BroadcastChannelProcedureName,
  type BroadcastChannelRequestPayload,
  ProcedureName,
  type ProtocolRequest,
  type ProtocolRequestHandler,
  type ProtocolVersion,
  type RequestPayload,
  type ResponsePayload,
  ResponseStatus,
} from '../../../types';
import { Utils, logger } from '../../../utils';
import { Bootstrap } from '../../Bootstrap';
import { UIServiceWorkerBroadcastChannel } from '../../broadcast-channel/UIServiceWorkerBroadcastChannel';
import type { AbstractUIServer } from '../AbstractUIServer';

const moduleName = 'AbstractUIService';

export abstract class AbstractUIService {
  protected static readonly ProcedureNameToBroadCastChannelProcedureNameMap: Omit<
    Record<ProcedureName, BroadcastChannelProcedureName>,
    | ProcedureName.START_SIMULATOR
    | ProcedureName.STOP_SIMULATOR
    | ProcedureName.LIST_CHARGING_STATIONS
  > = {
    [ProcedureName.START_CHARGING_STATION]: BroadcastChannelProcedureName.START_CHARGING_STATION,
    [ProcedureName.STOP_CHARGING_STATION]: BroadcastChannelProcedureName.STOP_CHARGING_STATION,
    [ProcedureName.CLOSE_CONNECTION]: BroadcastChannelProcedureName.CLOSE_CONNECTION,
    [ProcedureName.OPEN_CONNECTION]: BroadcastChannelProcedureName.OPEN_CONNECTION,
    [ProcedureName.START_AUTOMATIC_TRANSACTION_GENERATOR]:
      BroadcastChannelProcedureName.START_AUTOMATIC_TRANSACTION_GENERATOR,
    [ProcedureName.STOP_AUTOMATIC_TRANSACTION_GENERATOR]:
      BroadcastChannelProcedureName.STOP_AUTOMATIC_TRANSACTION_GENERATOR,
    [ProcedureName.SET_SUPERVISION_URL]: BroadcastChannelProcedureName.SET_SUPERVISION_URL,
    [ProcedureName.START_TRANSACTION]: BroadcastChannelProcedureName.START_TRANSACTION,
    [ProcedureName.STOP_TRANSACTION]: BroadcastChannelProcedureName.STOP_TRANSACTION,
    [ProcedureName.AUTHORIZE]: BroadcastChannelProcedureName.AUTHORIZE,
    [ProcedureName.BOOT_NOTIFICATION]: BroadcastChannelProcedureName.BOOT_NOTIFICATION,
    [ProcedureName.STATUS_NOTIFICATION]: BroadcastChannelProcedureName.STATUS_NOTIFICATION,
    [ProcedureName.HEARTBEAT]: BroadcastChannelProcedureName.HEARTBEAT,
    [ProcedureName.METER_VALUES]: BroadcastChannelProcedureName.METER_VALUES,
    [ProcedureName.DATA_TRANSFER]: BroadcastChannelProcedureName.DATA_TRANSFER,
    [ProcedureName.DIAGNOSTICS_STATUS_NOTIFICATION]:
      BroadcastChannelProcedureName.DIAGNOSTICS_STATUS_NOTIFICATION,
    [ProcedureName.FIRMWARE_STATUS_NOTIFICATION]:
      BroadcastChannelProcedureName.FIRMWARE_STATUS_NOTIFICATION,
  };

  protected readonly requestHandlers: Map<ProcedureName, ProtocolRequestHandler>;
  private readonly version: ProtocolVersion;
  private readonly uiServer: AbstractUIServer;
  private readonly uiServiceWorkerBroadcastChannel: UIServiceWorkerBroadcastChannel;
  private readonly broadcastChannelRequests: Map<string, number>;

  constructor(uiServer: AbstractUIServer, version: ProtocolVersion) {
    this.uiServer = uiServer;
    this.version = version;
    this.requestHandlers = new Map<ProcedureName, ProtocolRequestHandler>([
      [ProcedureName.LIST_CHARGING_STATIONS, this.handleListChargingStations.bind(this)],
      [ProcedureName.START_SIMULATOR, this.handleStartSimulator.bind(this)],
      [ProcedureName.STOP_SIMULATOR, this.handleStopSimulator.bind(this)],
    ]);
    this.uiServiceWorkerBroadcastChannel = new UIServiceWorkerBroadcastChannel(this);
    this.broadcastChannelRequests = new Map<string, number>();
  }

  public async requestHandler(request: ProtocolRequest): Promise<void> {
    let messageId: string;
    let command: ProcedureName;
    let requestPayload: RequestPayload | undefined;
    let responsePayload: ResponsePayload;
    try {
      [messageId, command, requestPayload] = request;

      if (this.requestHandlers.has(command) === false) {
        throw new BaseError(
          `${command} is not implemented to handle message payload ${JSON.stringify(
            requestPayload,
            null,
            2
          )}`
        );
      }

      // Call the request handler to build the response payload
      responsePayload = await this.requestHandlers.get(command)(messageId, command, requestPayload);
    } catch (error) {
      // Log
      logger.error(`${this.logPrefix(moduleName, 'messageHandler')} Handle request error:`, error);
      responsePayload = {
        hashIds: requestPayload?.hashIds,
        status: ResponseStatus.FAILURE,
        command,
        requestPayload,
        responsePayload,
        errorMessage: (error as Error).message,
        errorStack: (error as Error).stack,
        errorDetails: (error as OCPPError).details,
      };
    } finally {
      // Send response for payload not forwarded to broadcast channel
      if (!Utils.isNullOrUndefined(responsePayload)) {
        this.sendResponse(messageId, responsePayload);
      }
    }
  }

  public sendRequest(
    messageId: string,
    procedureName: ProcedureName,
    requestPayload: RequestPayload
  ): void {
    this.uiServer.sendRequest(
      this.uiServer.buildProtocolRequest(messageId, procedureName, requestPayload)
    );
  }

  public sendResponse(messageId: string, responsePayload: ResponsePayload): void {
    this.uiServer.sendResponse(this.uiServer.buildProtocolResponse(messageId, responsePayload));
  }

  public logPrefix = (modName: string, methodName: string): string => {
    return this.uiServer.logPrefix(modName, methodName, this.version);
  };

  public deleteBroadcastChannelRequest(uuid: string): void {
    this.broadcastChannelRequests.delete(uuid);
  }

  public getBroadcastChannelExpectedResponses(uuid: string): number {
    return this.broadcastChannelRequests.get(uuid) ?? 0;
  }

  protected handleProtocolRequest(
    uuid: string,
    procedureName: ProcedureName,
    payload: RequestPayload
  ): void {
    this.sendBroadcastChannelRequest(
      uuid,
      AbstractUIService.ProcedureNameToBroadCastChannelProcedureNameMap[
        procedureName
      ] as BroadcastChannelProcedureName,
      payload
    );
  }

  private sendBroadcastChannelRequest(
    uuid: string,
    procedureName: BroadcastChannelProcedureName,
    payload: BroadcastChannelRequestPayload
  ): void {
    if (Utils.isNotEmptyArray(payload.hashIds)) {
      payload.hashIds = payload.hashIds
        .filter((hashId) => !Utils.isNullOrUndefined(hashId))
        .map((hashId) => {
          if (this.uiServer.chargingStations.has(hashId) === true) {
            return hashId;
          }
          logger.warn(
            `${this.logPrefix(
              moduleName,
              'sendBroadcastChannelRequest'
            )} Charging station with hashId '${hashId}' not found`
          );
        });
    }
    const expectedNumberOfResponses = Utils.isNotEmptyArray(payload.hashIds)
      ? payload.hashIds.length
      : this.uiServer.chargingStations.size;
    this.uiServiceWorkerBroadcastChannel.sendRequest([uuid, procedureName, payload]);
    this.broadcastChannelRequests.set(uuid, expectedNumberOfResponses);
  }

  private handleListChargingStations(): ResponsePayload {
    return {
      status: ResponseStatus.SUCCESS,
      chargingStations: [...this.uiServer.chargingStations.values()],
    } as ResponsePayload;
  }

  private async handleStartSimulator(): Promise<ResponsePayload> {
    try {
      await Bootstrap.getInstance().start();
      return { status: ResponseStatus.SUCCESS };
    } catch (error) {
      return { status: ResponseStatus.FAILURE };
    }
  }

  private async handleStopSimulator(): Promise<ResponsePayload> {
    try {
      await Bootstrap.getInstance().stop();
      return { status: ResponseStatus.SUCCESS };
    } catch (error) {
      return { status: ResponseStatus.FAILURE };
    }
  }
}