src/charging-station/ocpp/2.0/OCPP20RequestService.ts

   1 // Partial Copyright Jerome Benoit. 2021-2023. All Rights Reserved.
   2
   3 import fs from 'fs';
   4 import path from 'path';
   5 import { fileURLToPath } from 'url';
   6
   7 import type { JSONSchemaType } from 'ajv';
   8
   9 import { OCPP20ServiceUtils } from './OCPP20ServiceUtils';
  10 import OCPPError from '../../../exception/OCPPError';
  11 import type { JsonObject, JsonType } from '../../../types/JsonType';
  12 import {
  13   type OCPP20BootNotificationRequest,
  14   type OCPP20HeartbeatRequest,
  15   OCPP20RequestCommand,
  16   type OCPP20StatusNotificationRequest,
  17 } from '../../../types/ocpp/2.0/Requests';
  18 import { ErrorType } from '../../../types/ocpp/ErrorType';
  19 import { OCPPVersion } from '../../../types/ocpp/OCPPVersion';
  20 import type { RequestParams } from '../../../types/ocpp/Requests';
  21 import Utils from '../../../utils/Utils';
  22 import type ChargingStation from '../../ChargingStation';
  23 import OCPPConstants from '../OCPPConstants';
  24 import OCPPRequestService from '../OCPPRequestService';
  25 import type OCPPResponseService from '../OCPPResponseService';
  26
  27 const moduleName = 'OCPP20RequestService';
  28
  29 export default class OCPP20RequestService extends OCPPRequestService {
  30   protected jsonSchemas: Map<OCPP20RequestCommand, JSONSchemaType<JsonObject>>;
  31
  32   public constructor(ocppResponseService: OCPPResponseService) {
  33     if (new.target?.name === moduleName) {
  34       throw new TypeError(`Cannot construct ${new.target?.name} instances directly`);
  35     }
  36     super(OCPPVersion.VERSION_20, ocppResponseService);
  37     this.jsonSchemas = new Map<OCPP20RequestCommand, JSONSchemaType<JsonObject>>([
  38       [
  39         OCPP20RequestCommand.BOOT_NOTIFICATION,
  40         this.parseJsonSchemaFile<OCPP20BootNotificationRequest>(
  41           '../../../assets/json-schemas/ocpp/2.0/BootNotificationRequest.json'
  42         ),
  43       ],
  44       [
  45         OCPP20RequestCommand.HEARTBEAT,
  46         this.parseJsonSchemaFile<OCPP20HeartbeatRequest>(
  47           '../../../assets/json-schemas/ocpp/2.0/HeartbeatRequest.json'
  48         ),
  49       ],
  50       [
  51         OCPP20RequestCommand.STATUS_NOTIFICATION,
  52         this.parseJsonSchemaFile<OCPP20StatusNotificationRequest>(
  53           '../../../assets/json-schemas/ocpp/2.0/StatusNotificationRequest.json'
  54         ),
  55       ],
  56     ]);
  57     this.buildRequestPayload.bind(this);
  58   }
  59
  60   public async requestHandler<RequestType extends JsonType, ResponseType extends JsonType>(
  61     chargingStation: ChargingStation,
  62     commandName: OCPP20RequestCommand,
  63     commandParams?: JsonType,
  64     params?: RequestParams
  65   ): Promise<ResponseType> {
  66     if (OCPP20ServiceUtils.isRequestCommandSupported(chargingStation, commandName) === true) {
  67       return (await this.sendMessage(
  68         chargingStation,
  69         Utils.generateUUID(),
  70         this.buildRequestPayload<RequestType>(chargingStation, commandName, commandParams),
  71         commandName,
  72         params
  73       )) as unknown as ResponseType;
  74     }
  75     // OCPPError usage here is debatable: it's an error in the OCPP stack but not targeted to sendError().
  76     throw new OCPPError(
  77       ErrorType.NOT_SUPPORTED,
  78       `Unsupported OCPP command '${commandName}'`,
  79       commandName,
  80       commandParams
  81     );
  82   }
  83
  84   private buildRequestPayload<Request extends JsonType>(
  85     chargingStation: ChargingStation,
  86     commandName: OCPP20RequestCommand,
  87     commandParams?: JsonType
  88   ): Request {
  89     commandParams = commandParams as JsonObject;
  90     switch (commandName) {
  91       case OCPP20RequestCommand.BOOT_NOTIFICATION:
  92         return commandParams as unknown as Request;
  93       case OCPP20RequestCommand.HEARTBEAT:
  94         return OCPPConstants.OCPP_RESPONSE_EMPTY as unknown as Request;
  95       case OCPP20RequestCommand.STATUS_NOTIFICATION:
  96         return {
  97           timestamp: new Date(),
  98           ...commandParams,
  99         } as unknown as Request;
 100       default:
 101         // OCPPError usage here is debatable: it's an error in the OCPP stack but not targeted to sendError().
 102         throw new OCPPError(
 103           ErrorType.NOT_SUPPORTED,
 104           // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
 105           `Unsupported OCPP command '${commandName}'`,
 106           commandName,
 107           commandParams
 108         );
 109     }
 110   }
 111
 112   private parseJsonSchemaFile<T extends JsonType>(relativePath: string): JSONSchemaType<T> {
 113     return JSON.parse(
 114       fs.readFileSync(
 115         path.resolve(path.dirname(fileURLToPath(import.meta.url)), relativePath),
 116         'utf8'
 117       )
 118     ) as JSONSchemaType<T>;
 119   }
 120 }