Cleanup

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

import { AuthorizeResponse, StartTransactionResponse, StopTransactionReason, StopTransactionResponse } from '../../types/ocpp/Transaction';
import { DiagnosticsStatus, IncomingRequestCommand, RequestCommand } from '../../types/ocpp/Requests';

import { BootNotificationResponse } from '../../types/ocpp/Responses';
import { ChargePointErrorCode } from '../../types/ocpp/ChargePointErrorCode';
import { ChargePointStatus } from '../../types/ocpp/ChargePointStatus';
import ChargingStation from '../ChargingStation';
import Constants from '../../utils/Constants';
import { ErrorType } from '../../types/ocpp/ErrorType';
import { MessageType } from '../../types/ocpp/MessageType';
import { MeterValue } from '../../types/ocpp/MeterValues';
import OCPPError from './OCPPError';
import OCPPResponseService from './OCPPResponseService';
import PerformanceStatistics from '../../performance/PerformanceStatistics';
import logger from '../../utils/Logger';

export default abstract class OCPPRequestService {
  public chargingStation: ChargingStation;
  protected ocppResponseService: OCPPResponseService;

  constructor(chargingStation: ChargingStation, ocppResponseService: OCPPResponseService) {
    this.chargingStation = chargingStation;
    this.ocppResponseService = ocppResponseService;
  }

  public async sendMessage(messageId: string, commandParams: any, messageType: MessageType, commandName: RequestCommand | IncomingRequestCommand,
      skipBufferingOnError = false): Promise<unknown> {
    // eslint-disable-next-line @typescript-eslint/no-this-alias
    const self = this;
    // Send a message through wsConnection
    return new Promise((resolve, reject) => {
      const messageToSend = this.buildMessageToSend(messageId, commandParams, messageType, commandName, responseCallback, rejectCallback);
      if (this.chargingStation.getEnableStatistics()) {
        this.chargingStation.performanceStatistics.addRequestStatistic(commandName, messageType);
      }
      // Check if wsConnection opened
      if (this.chargingStation.isWebSocketConnectionOpened()) {
        // Yes: Send Message
        const beginId = PerformanceStatistics.beginMeasure(commandName);
        // FIXME: Handle sending error
        this.chargingStation.wsConnection.send(messageToSend);
        PerformanceStatistics.endMeasure(commandName, beginId);
      } else if (!skipBufferingOnError) {
        // Buffer it
        this.chargingStation.addToMessageQueue(messageToSend);
        const ocppError = new OCPPError(ErrorType.GENERIC_ERROR, `WebSocket closed for buffered message id '${messageId}' with content '${messageToSend}'`, commandParams?.details ?? {});
        if (messageType === MessageType.CALL_MESSAGE) {
          // Reject it but keep the request in the cache
          return reject(ocppError);
        }
        return rejectCallback(ocppError);
      } else {
        // Reject it
        return rejectCallback(new OCPPError(ErrorType.GENERIC_ERROR, `WebSocket closed for non buffered message id '${messageId}' with content '${messageToSend}'`, commandParams?.details ?? {}));
      }
      // Response?
      if (messageType !== MessageType.CALL_MESSAGE) {
        // Yes: send Ok
        resolve(commandParams);
      } else {
        // Send timeout
        setTimeout(() => rejectCallback(new OCPPError(ErrorType.GENERIC_ERROR, `Timeout for message id '${messageId}' with content '${messageToSend}'`, commandParams?.details ?? {})), Constants.OCPP_SOCKET_TIMEOUT);
      }

      /**
       * Function that will receive the request's response
       *
       * @param payload
       * @param requestPayload
       */
      async function responseCallback(payload: Record<string, unknown> | string, requestPayload: Record<string, unknown>): Promise<void> {
        if (self.chargingStation.getEnableStatistics()) {
          self.chargingStation.performanceStatistics.addRequestStatistic(commandName, MessageType.CALL_RESULT_MESSAGE);
        }
        // Send the response
        await self.ocppResponseService.handleResponse(commandName as RequestCommand, payload, requestPayload);
        self.chargingStation.requests.delete(messageId);
        resolve(payload);
      }

      /**
       * Function that will receive the request's error response
       *
       * @param error
       */
      function rejectCallback(error: OCPPError): void {
        if (self.chargingStation.getEnableStatistics()) {
          self.chargingStation.performanceStatistics.addRequestStatistic(commandName, MessageType.CALL_ERROR_MESSAGE);
        }
        logger.error(`${self.chargingStation.logPrefix()} Error %j occurred when calling command %s with parameters %j`, error, commandName, commandParams);
        self.chargingStation.requests.delete(messageId);
        reject(error);
      }
    });
  }

  protected handleRequestError(commandName: RequestCommand, error: Error): void {
    logger.error(this.chargingStation.logPrefix() + ' Request command ' + commandName + ' error: %j', error);
    throw error;
  }

  private buildMessageToSend(messageId: string, commandParams: Record<string, unknown>, messageType: MessageType, commandName: RequestCommand | IncomingRequestCommand,
      responseCallback: (payload: Record<string, unknown> | string, requestPayload: Record<string, unknown>) => Promise<void>, rejectCallback: (error: OCPPError) => void): string {
    let messageToSend: string;
    // Type of message
    switch (messageType) {
      // Request
      case MessageType.CALL_MESSAGE:
        // Build request
        this.chargingStation.requests.set(messageId, [responseCallback, rejectCallback, commandName, commandParams]);
        messageToSend = JSON.stringify([messageType, messageId, commandName, commandParams]);
        break;
      // Response
      case MessageType.CALL_RESULT_MESSAGE:
        // Build response
        messageToSend = JSON.stringify([messageType, messageId, commandParams]);
        break;
      // Error Message
      case MessageType.CALL_ERROR_MESSAGE:
        // Build Error Message
        messageToSend = JSON.stringify([messageType, messageId, commandParams?.code ?? ErrorType.GENERIC_ERROR, commandParams?.message ?? '', commandParams?.details ?? {}]);
        break;
    }
    return messageToSend;
  }

  public abstract sendHeartbeat(): Promise<void>;
  public abstract sendBootNotification(chargePointModel: string, chargePointVendor: string, chargeBoxSerialNumber?: string, firmwareVersion?: string, chargePointSerialNumber?: string, iccid?: string, imsi?: string, meterSerialNumber?: string, meterType?: string): Promise<BootNotificationResponse>;
  public abstract sendStatusNotification(connectorId: number, status: ChargePointStatus, errorCode?: ChargePointErrorCode): Promise<void>;
  public abstract sendAuthorize(connectorId: number, idTag?: string): Promise<AuthorizeResponse>;
  public abstract sendStartTransaction(connectorId: number, idTag?: string): Promise<StartTransactionResponse>;
  public abstract sendStopTransaction(transactionId: number, meterStop: number, idTag?: string, reason?: StopTransactionReason): Promise<StopTransactionResponse>;
  public abstract sendMeterValues(connectorId: number, transactionId: number, interval: number): Promise<void>;
  public abstract sendTransactionBeginMeterValues(connectorId: number, transactionId: number, beginMeterValue: MeterValue): Promise<void>;
  public abstract sendTransactionEndMeterValues(connectorId: number, transactionId: number, endMeterValue: MeterValue): Promise<void>;
  public abstract sendDiagnosticsStatusNotification(diagnosticsStatus: DiagnosticsStatus): Promise<void>;
  public abstract sendError(messageId: string, error: OCPPError, commandName: RequestCommand | IncomingRequestCommand): Promise<unknown>;
}