| 1 | import { |
| 2 | DiagnosticsStatus, |
| 3 | IncomingRequestCommand, |
| 4 | RequestCommand, |
| 5 | ResponseType, |
| 6 | SendParams, |
| 7 | } from '../../types/ocpp/Requests'; |
| 8 | |
| 9 | import type ChargingStation from '../ChargingStation'; |
| 10 | import Constants from '../../utils/Constants'; |
| 11 | import { EmptyObject } from '../../types/EmptyObject'; |
| 12 | import { ErrorType } from '../../types/ocpp/ErrorType'; |
| 13 | import { HandleErrorParams } from '../../types/Error'; |
| 14 | import { JsonType } from '../../types/JsonType'; |
| 15 | import { MessageType } from '../../types/ocpp/MessageType'; |
| 16 | import OCPPError from '../../exception/OCPPError'; |
| 17 | import type OCPPResponseService from './OCPPResponseService'; |
| 18 | import PerformanceStatistics from '../../performance/PerformanceStatistics'; |
| 19 | import Utils from '../../utils/Utils'; |
| 20 | import logger from '../../utils/Logger'; |
| 21 | |
| 22 | export default abstract class OCPPRequestService { |
| 23 | private static readonly instances: Map<string, OCPPRequestService> = new Map< |
| 24 | string, |
| 25 | OCPPRequestService |
| 26 | >(); |
| 27 | |
| 28 | protected readonly chargingStation: ChargingStation; |
| 29 | private readonly ocppResponseService: OCPPResponseService; |
| 30 | |
| 31 | protected constructor( |
| 32 | chargingStation: ChargingStation, |
| 33 | ocppResponseService: OCPPResponseService |
| 34 | ) { |
| 35 | this.chargingStation = chargingStation; |
| 36 | this.ocppResponseService = ocppResponseService; |
| 37 | this.sendMessageHandler.bind(this); |
| 38 | } |
| 39 | |
| 40 | public static getInstance<T extends OCPPRequestService>( |
| 41 | this: new (chargingStation: ChargingStation, ocppResponseService: OCPPResponseService) => T, |
| 42 | chargingStation: ChargingStation, |
| 43 | ocppResponseService: OCPPResponseService |
| 44 | ): T { |
| 45 | if (!OCPPRequestService.instances.has(chargingStation.id)) { |
| 46 | OCPPRequestService.instances.set( |
| 47 | chargingStation.id, |
| 48 | new this(chargingStation, ocppResponseService) |
| 49 | ); |
| 50 | } |
| 51 | return OCPPRequestService.instances.get(chargingStation.id) as T; |
| 52 | } |
| 53 | |
| 54 | public async sendResult( |
| 55 | messageId: string, |
| 56 | messagePayload: JsonType, |
| 57 | commandName: IncomingRequestCommand |
| 58 | ): Promise<ResponseType> { |
| 59 | try { |
| 60 | // Send result message |
| 61 | return await this.internalSendMessage( |
| 62 | messageId, |
| 63 | messagePayload, |
| 64 | MessageType.CALL_RESULT_MESSAGE, |
| 65 | commandName |
| 66 | ); |
| 67 | } catch (error) { |
| 68 | this.handleRequestError(commandName, error as Error); |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | public async sendError( |
| 73 | messageId: string, |
| 74 | ocppError: OCPPError, |
| 75 | commandName: IncomingRequestCommand |
| 76 | ): Promise<ResponseType> { |
| 77 | try { |
| 78 | // Send error message |
| 79 | return await this.internalSendMessage( |
| 80 | messageId, |
| 81 | ocppError, |
| 82 | MessageType.CALL_ERROR_MESSAGE, |
| 83 | commandName |
| 84 | ); |
| 85 | } catch (error) { |
| 86 | this.handleRequestError(commandName, error as Error); |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | protected async sendMessage( |
| 91 | messageId: string, |
| 92 | messagePayload: JsonType, |
| 93 | commandName: RequestCommand, |
| 94 | params: SendParams = { |
| 95 | skipBufferingOnError: false, |
| 96 | triggerMessage: false, |
| 97 | } |
| 98 | ): Promise<ResponseType> { |
| 99 | try { |
| 100 | return await this.internalSendMessage( |
| 101 | messageId, |
| 102 | messagePayload, |
| 103 | MessageType.CALL_MESSAGE, |
| 104 | commandName, |
| 105 | params |
| 106 | ); |
| 107 | } catch (error) { |
| 108 | this.handleRequestError(commandName, error as Error, { throwError: false }); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | private async internalSendMessage( |
| 113 | messageId: string, |
| 114 | messagePayload: JsonType | OCPPError, |
| 115 | messageType: MessageType, |
| 116 | commandName?: RequestCommand | IncomingRequestCommand, |
| 117 | params: SendParams = { |
| 118 | skipBufferingOnError: false, |
| 119 | triggerMessage: false, |
| 120 | } |
| 121 | ): Promise<ResponseType> { |
| 122 | if ( |
| 123 | (this.chargingStation.isInUnknownState() && |
| 124 | commandName === RequestCommand.BOOT_NOTIFICATION) || |
| 125 | (!this.chargingStation.getOcppStrictCompliance() && |
| 126 | this.chargingStation.isInUnknownState()) || |
| 127 | this.chargingStation.isInAcceptedState() || |
| 128 | (this.chargingStation.isInPendingState() && params.triggerMessage) |
| 129 | ) { |
| 130 | // eslint-disable-next-line @typescript-eslint/no-this-alias |
| 131 | const self = this; |
| 132 | // Send a message through wsConnection |
| 133 | return Utils.promiseWithTimeout( |
| 134 | new Promise((resolve, reject) => { |
| 135 | const messageToSend = this.buildMessageToSend( |
| 136 | messageId, |
| 137 | messagePayload, |
| 138 | messageType, |
| 139 | commandName, |
| 140 | responseCallback, |
| 141 | rejectCallback |
| 142 | ); |
| 143 | if (this.chargingStation.getEnableStatistics()) { |
| 144 | this.chargingStation.performanceStatistics.addRequestStatistic( |
| 145 | commandName, |
| 146 | messageType |
| 147 | ); |
| 148 | } |
| 149 | // Check if wsConnection opened |
| 150 | if (this.chargingStation.isWebSocketConnectionOpened()) { |
| 151 | // Yes: Send Message |
| 152 | const beginId = PerformanceStatistics.beginMeasure(commandName); |
| 153 | // FIXME: Handle sending error |
| 154 | this.chargingStation.wsConnection.send(messageToSend); |
| 155 | PerformanceStatistics.endMeasure(commandName, beginId); |
| 156 | } else if (!params.skipBufferingOnError) { |
| 157 | // Buffer it |
| 158 | this.chargingStation.bufferMessage(messageToSend); |
| 159 | const ocppError = new OCPPError( |
| 160 | ErrorType.GENERIC_ERROR, |
| 161 | `WebSocket closed for buffered message id '${messageId}' with content '${messageToSend}'`, |
| 162 | commandName, |
| 163 | (messagePayload?.details as JsonType) ?? {} |
| 164 | ); |
| 165 | if (messageType === MessageType.CALL_MESSAGE) { |
| 166 | // Reject it but keep the request in the cache |
| 167 | return reject(ocppError); |
| 168 | } |
| 169 | return rejectCallback(ocppError, false); |
| 170 | } else { |
| 171 | // Reject it |
| 172 | return rejectCallback( |
| 173 | new OCPPError( |
| 174 | ErrorType.GENERIC_ERROR, |
| 175 | `WebSocket closed for non buffered message id '${messageId}' with content '${messageToSend}'`, |
| 176 | commandName, |
| 177 | (messagePayload?.details as JsonType) ?? {} |
| 178 | ), |
| 179 | false |
| 180 | ); |
| 181 | } |
| 182 | // Response? |
| 183 | if (messageType !== MessageType.CALL_MESSAGE) { |
| 184 | // Yes: send Ok |
| 185 | return resolve(messagePayload); |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * Function that will receive the request's response |
| 190 | * |
| 191 | * @param payload |
| 192 | * @param requestPayload |
| 193 | */ |
| 194 | async function responseCallback( |
| 195 | payload: JsonType | string, |
| 196 | requestPayload: JsonType |
| 197 | ): Promise<void> { |
| 198 | if (self.chargingStation.getEnableStatistics()) { |
| 199 | self.chargingStation.performanceStatistics.addRequestStatistic( |
| 200 | commandName, |
| 201 | MessageType.CALL_RESULT_MESSAGE |
| 202 | ); |
| 203 | } |
| 204 | // Handle the request's response |
| 205 | try { |
| 206 | await self.ocppResponseService.handleResponse( |
| 207 | commandName as RequestCommand, |
| 208 | payload, |
| 209 | requestPayload |
| 210 | ); |
| 211 | resolve(payload); |
| 212 | } catch (error) { |
| 213 | reject(error); |
| 214 | throw error; |
| 215 | } finally { |
| 216 | self.chargingStation.requests.delete(messageId); |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | /** |
| 221 | * Function that will receive the request's error response |
| 222 | * |
| 223 | * @param error |
| 224 | * @param requestStatistic |
| 225 | */ |
| 226 | function rejectCallback(error: OCPPError, requestStatistic = true): void { |
| 227 | if (requestStatistic && self.chargingStation.getEnableStatistics()) { |
| 228 | self.chargingStation.performanceStatistics.addRequestStatistic( |
| 229 | commandName, |
| 230 | MessageType.CALL_ERROR_MESSAGE |
| 231 | ); |
| 232 | } |
| 233 | logger.error( |
| 234 | `${self.chargingStation.logPrefix()} Error %j occurred when calling command %s with message data %j`, |
| 235 | error, |
| 236 | commandName, |
| 237 | messagePayload |
| 238 | ); |
| 239 | self.chargingStation.requests.delete(messageId); |
| 240 | reject(error); |
| 241 | } |
| 242 | }), |
| 243 | Constants.OCPP_WEBSOCKET_TIMEOUT, |
| 244 | new OCPPError( |
| 245 | ErrorType.GENERIC_ERROR, |
| 246 | `Timeout for message id '${messageId}'`, |
| 247 | commandName, |
| 248 | (messagePayload?.details as JsonType) ?? {} |
| 249 | ), |
| 250 | () => { |
| 251 | messageType === MessageType.CALL_MESSAGE && |
| 252 | this.chargingStation.requests.delete(messageId); |
| 253 | } |
| 254 | ); |
| 255 | } |
| 256 | throw new OCPPError( |
| 257 | ErrorType.SECURITY_ERROR, |
| 258 | `Cannot send command ${commandName} payload when the charging station is in ${this.chargingStation.getRegistrationStatus()} state on the central server`, |
| 259 | commandName |
| 260 | ); |
| 261 | } |
| 262 | |
| 263 | private buildMessageToSend( |
| 264 | messageId: string, |
| 265 | messagePayload: JsonType | OCPPError, |
| 266 | messageType: MessageType, |
| 267 | commandName?: RequestCommand | IncomingRequestCommand, |
| 268 | responseCallback?: (payload: JsonType | string, requestPayload: JsonType) => Promise<void>, |
| 269 | rejectCallback?: (error: OCPPError, requestStatistic?: boolean) => void |
| 270 | ): string { |
| 271 | let messageToSend: string; |
| 272 | // Type of message |
| 273 | switch (messageType) { |
| 274 | // Request |
| 275 | case MessageType.CALL_MESSAGE: |
| 276 | // Build request |
| 277 | this.chargingStation.requests.set(messageId, [ |
| 278 | responseCallback, |
| 279 | rejectCallback, |
| 280 | commandName, |
| 281 | messagePayload, |
| 282 | ]); |
| 283 | messageToSend = JSON.stringify([messageType, messageId, commandName, messagePayload]); |
| 284 | break; |
| 285 | // Response |
| 286 | case MessageType.CALL_RESULT_MESSAGE: |
| 287 | // Build response |
| 288 | messageToSend = JSON.stringify([messageType, messageId, messagePayload]); |
| 289 | break; |
| 290 | // Error Message |
| 291 | case MessageType.CALL_ERROR_MESSAGE: |
| 292 | // Build Error Message |
| 293 | messageToSend = JSON.stringify([ |
| 294 | messageType, |
| 295 | messageId, |
| 296 | messagePayload?.code ?? ErrorType.GENERIC_ERROR, |
| 297 | messagePayload?.message ?? '', |
| 298 | messagePayload?.details ?? { commandName }, |
| 299 | ]); |
| 300 | break; |
| 301 | } |
| 302 | return messageToSend; |
| 303 | } |
| 304 | |
| 305 | private handleRequestError( |
| 306 | commandName: RequestCommand | IncomingRequestCommand, |
| 307 | error: Error, |
| 308 | params: HandleErrorParams<EmptyObject> = { throwError: true } |
| 309 | ): void { |
| 310 | logger.error( |
| 311 | this.chargingStation.logPrefix() + ' Request command %s error: %j', |
| 312 | commandName, |
| 313 | error |
| 314 | ); |
| 315 | if (params?.throwError) { |
| 316 | throw error; |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | public abstract sendMessageHandler( |
| 321 | commandName: RequestCommand, |
| 322 | commandParams?: JsonType, |
| 323 | params?: SendParams |
| 324 | ): Promise<ResponseType>; |
| 325 | } |