src/charging-station/ocpp/OCPPResponseService.ts

   1 import _Ajv, { type ValidateFunction } from 'ajv'
   2 import _ajvFormats from 'ajv-formats'
   3
   4 import type { ChargingStation } from '../../charging-station/index.js'
   5 import { OCPPError } from '../../exception/index.js'
   6 import type {
   7   IncomingRequestCommand,
   8   JsonType,
   9   OCPPVersion,
  10   RequestCommand
  11 } from '../../types/index.js'
  12 import { Constants, logger } from '../../utils/index.js'
  13 import { OCPPServiceUtils } from './OCPPServiceUtils.js'
  14 type Ajv = _Ajv.default
  15 // eslint-disable-next-line @typescript-eslint/no-redeclare
  16 const Ajv = _Ajv.default
  17 const ajvFormats = _ajvFormats.default
  18
  19 const moduleName = 'OCPPResponseService'
  20
  21 export abstract class OCPPResponseService {
  22   private static instance: OCPPResponseService | null = null
  23   private readonly version: OCPPVersion
  24   protected readonly ajv: Ajv
  25   protected readonly ajvIncomingRequest: Ajv
  26   protected abstract payloadValidateFunctions: Map<RequestCommand, ValidateFunction<JsonType>>
  27   public abstract incomingRequestResponsePayloadValidateFunctions: Map<
  28   IncomingRequestCommand,
  29   ValidateFunction<JsonType>
  30   >
  31
  32   protected constructor (version: OCPPVersion) {
  33     this.version = version
  34     this.ajv = new Ajv({
  35       keywords: ['javaType'],
  36       multipleOfPrecision: 2
  37     })
  38     ajvFormats(this.ajv)
  39     this.ajvIncomingRequest = new Ajv({
  40       keywords: ['javaType'],
  41       multipleOfPrecision: 2
  42     })
  43     ajvFormats(this.ajvIncomingRequest)
  44     this.responseHandler = this.responseHandler.bind(this)
  45     this.validateResponsePayload = this.validateResponsePayload.bind(this)
  46   }
  47
  48   public static getInstance<T extends OCPPResponseService>(this: new () => T): T {
  49     if (OCPPResponseService.instance === null) {
  50       OCPPResponseService.instance = new this()
  51     }
  52     return OCPPResponseService.instance as T
  53   }
  54
  55   protected validateResponsePayload<T extends JsonType>(
  56     chargingStation: ChargingStation,
  57     commandName: RequestCommand,
  58     payload: T
  59   ): boolean {
  60     if (chargingStation.stationInfo?.ocppStrictCompliance === false) {
  61       return true
  62     }
  63     const validate = this.payloadValidateFunctions.get(commandName)
  64     if (validate?.(payload) === true) {
  65       return true
  66     }
  67     logger.error(
  68       `${chargingStation.logPrefix()} ${moduleName}.validateResponsePayload: Command '${commandName}' response PDU is invalid: %j`,
  69       validate?.errors
  70     )
  71     throw new OCPPError(
  72       OCPPServiceUtils.ajvErrorsToErrorType(validate?.errors),
  73       'Response PDU is invalid',
  74       commandName,
  75       JSON.stringify(validate?.errors, undefined, 2)
  76     )
  77   }
  78
  79   protected emptyResponseHandler = Constants.EMPTY_FUNCTION
  80
  81   public abstract responseHandler<ReqType extends JsonType, ResType extends JsonType>(
  82     chargingStation: ChargingStation,
  83     commandName: RequestCommand,
  84     payload: ResType,
  85     requestPayload: ReqType
  86   ): Promise<void>
  87 }