src/charging-station/ChargingStationWorkerBroadcastChannel.ts

   1 import BaseError from '../exception/BaseError';
   2 import { RequestCommand } from '../types/ocpp/Requests';
   3 import {
   4   AuthorizationStatus,
   5   StartTransactionRequest,
   6   StartTransactionResponse,
   7   StopTransactionReason,
   8   StopTransactionRequest,
   9   StopTransactionResponse,
  10 } from '../types/ocpp/Transaction';
  11 import {
  12   BroadcastChannelProcedureName,
  13   BroadcastChannelRequest,
  14   BroadcastChannelRequestPayload,
  15   BroadcastChannelResponsePayload,
  16   MessageEvent,
  17 } from '../types/WorkerBroadcastChannel';
  18 import { ResponseStatus } from '../ui/web/src/type/UIProtocol';
  19 import logger from '../utils/Logger';
  20 import type ChargingStation from './ChargingStation';
  21 import WorkerBroadcastChannel from './WorkerBroadcastChannel';
  22
  23 const moduleName = 'ChargingStationWorkerBroadcastChannel';
  24
  25 type CommandResponse = StartTransactionResponse | StopTransactionResponse;
  26
  27 export default class ChargingStationWorkerBroadcastChannel extends WorkerBroadcastChannel {
  28   private readonly chargingStation: ChargingStation;
  29
  30   constructor(chargingStation: ChargingStation) {
  31     super();
  32     this.chargingStation = chargingStation;
  33     this.onmessage = this.requestHandler.bind(this) as (message: MessageEvent) => void;
  34     this.onmessageerror = this.messageErrorHandler.bind(this) as (message: MessageEvent) => void;
  35   }
  36
  37   private async requestHandler(messageEvent: MessageEvent): Promise<void> {
  38     if (this.isResponse(messageEvent.data)) {
  39       return;
  40     }
  41     if (Array.isArray(messageEvent.data) === false) {
  42       throw new BaseError('Worker broadcast channel protocol request is not an array');
  43     }
  44
  45     const [uuid, command, requestPayload] = messageEvent.data as BroadcastChannelRequest;
  46
  47     if (requestPayload?.hashId !== this.chargingStation.hashId) {
  48       return;
  49     }
  50
  51     let responsePayload: BroadcastChannelResponsePayload;
  52     let commandResponse: CommandResponse;
  53     try {
  54       commandResponse = await this.commandHandler(command, requestPayload);
  55       if (commandResponse === undefined) {
  56         responsePayload = { status: ResponseStatus.SUCCESS };
  57       } else {
  58         responsePayload = { status: this.commandResponseToResponseStatus(commandResponse) };
  59       }
  60     } catch (error) {
  61       logger.error(
  62         `${this.chargingStation.logPrefix()} ${moduleName}.requestHandler: Handle request error:`,
  63         error
  64       );
  65       responsePayload = {
  66         status: ResponseStatus.FAILURE,
  67         command,
  68         requestPayload,
  69         commandResponse,
  70         errorMessage: (error as Error).message,
  71         errorStack: (error as Error).stack,
  72       };
  73     }
  74     this.sendResponse([uuid, responsePayload]);
  75   }
  76
  77   private messageErrorHandler(messageEvent: MessageEvent): void {
  78     logger.error(
  79       `${this.chargingStation.logPrefix()} ${moduleName}.messageErrorHandler: Error at handling message:`,
  80       { messageEvent, messageEventData: messageEvent.data }
  81     );
  82   }
  83
  84   private async commandHandler(
  85     command: BroadcastChannelProcedureName,
  86     requestPayload: BroadcastChannelRequestPayload
  87   ): Promise<CommandResponse | undefined> {
  88     switch (command) {
  89       case BroadcastChannelProcedureName.START_TRANSACTION:
  90         return this.chargingStation.ocppRequestService.requestHandler<
  91           StartTransactionRequest,
  92           StartTransactionResponse
  93         >(this.chargingStation, RequestCommand.START_TRANSACTION, {
  94           connectorId: requestPayload.connectorId,
  95           idTag: requestPayload.idTag,
  96         });
  97       case BroadcastChannelProcedureName.STOP_TRANSACTION:
  98         return this.chargingStation.ocppRequestService.requestHandler<
  99           StopTransactionRequest,
 100           StopTransactionResponse
 101         >(this.chargingStation, RequestCommand.STOP_TRANSACTION, {
 102           transactionId: requestPayload.transactionId,
 103           meterStop: this.chargingStation.getEnergyActiveImportRegisterByTransactionId(
 104             requestPayload.transactionId
 105           ),
 106           idTag: this.chargingStation.getTransactionIdTag(requestPayload.transactionId),
 107           reason: StopTransactionReason.NONE,
 108         });
 109       case BroadcastChannelProcedureName.START_CHARGING_STATION:
 110         this.chargingStation.start();
 111         break;
 112       case BroadcastChannelProcedureName.STOP_CHARGING_STATION:
 113         await this.chargingStation.stop();
 114         break;
 115       case BroadcastChannelProcedureName.OPEN_CONNECTION:
 116         this.chargingStation.openWSConnection();
 117         break;
 118       case BroadcastChannelProcedureName.CLOSE_CONNECTION:
 119         this.chargingStation.closeWSConnection();
 120         break;
 121       default:
 122         // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
 123         throw new BaseError(`Unknown worker broadcast channel command: ${command}`);
 124     }
 125   }
 126
 127   private commandResponseToResponseStatus(commandResponse: CommandResponse): ResponseStatus {
 128     if (commandResponse?.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
 129       return ResponseStatus.SUCCESS;
 130     }
 131     return ResponseStatus.FAILURE;
 132   }
 133 }