src/charging-station/ChargingStation.js

   1 const Configuration = require('../utils/Configuration');
   2 const logger = require('../utils/Logger');
   3 const WebSocket = require('ws');
   4 const Constants = require('../utils/Constants');
   5 const Utils = require('../utils/Utils');
   6 const OCPPError = require('./OcppError');
   7 const AutomaticTransactionGenerator = require('./AutomaticTransactionGenerator');
   8 const Statistics = require('../utils/Statistics');
   9 const fs = require('fs');
  10 const {performance, PerformanceObserver} = require('perf_hooks');
  11
  12 class ChargingStation {
  13   constructor(index, stationTemplateFile) {
  14     this._index = index;
  15     this._stationTemplateFile = stationTemplateFile;
  16     this._initialize();
  17
  18     this._autoReconnectRetryCount = 0;
  19     this._autoReconnectMaxRetries = Configuration.getAutoReconnectMaxRetries(); // -1 for unlimited
  20     this._autoReconnectTimeout = Configuration.getAutoReconnectTimeout() * 1000; // ms, zero for disabling
  21
  22     this._requests = {};
  23     this._messageQueue = [];
  24
  25     this._isSocketRestart = false;
  26
  27     this._authorizedTags = this._loadAndGetAuthorizedTags();
  28   }
  29
  30   _initialize() {
  31     this._stationInfo = this._buildStationInfo();
  32     this._bootNotificationMessage = {
  33       chargePointModel: this._stationInfo.chargePointModel,
  34       chargePointVendor: this._stationInfo.chargePointVendor,
  35       chargePointSerialNumber: this._stationInfo.chargePointSerialNumberPrefix ? this._stationInfo.chargePointSerialNumberPrefix : '',
  36       firmwareVersion: this._stationInfo.firmwareVersion ? this._stationInfo.firmwareVersion : '',
  37     };
  38     this._configuration = this._getConfiguration();
  39     this._supervisionUrl = this._getSupervisionURL();
  40     this._statistics = new Statistics(this._stationInfo.name);
  41     this._performanceObserver = new PerformanceObserver((list) => {
  42       const entry = list.getEntries()[0];
  43       this._statistics.logPerformance(entry, 'ChargingStation');
  44       this._performanceObserver.disconnect();
  45     });
  46   }
  47
  48   _basicFormatLog() {
  49     return Utils.basicFormatLog(` ${this._stationInfo.name}:`);
  50   }
  51
  52   _getConfiguration() {
  53     return this._stationInfo.Configuration ? this._stationInfo.Configuration : {};
  54   }
  55
  56   _getAuthorizationFile() {
  57     return this._stationInfo.authorizationFile ? this._stationInfo.authorizationFile : '';
  58   }
  59
  60   _loadAndGetAuthorizedTags() {
  61     let authorizedTags = [];
  62     const authorizationFile = this._getAuthorizationFile();
  63     if (authorizationFile) {
  64       try {
  65         // Load authorization file
  66         const fileDescriptor = fs.openSync(authorizationFile, 'r');
  67         authorizedTags = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8'));
  68         fs.closeSync(fileDescriptor);
  69       } catch (error) {
  70         logger.error(this._basicFormatLog() + ' Authorization file loading error: ' + error);
  71       }
  72     } else {
  73       logger.info(this._basicFormatLog() + ' No authorization file given in template file ' + this._stationTemplateFile);
  74     }
  75     return authorizedTags;
  76   }
  77
  78   _startAuthorizationFileMonitoring() {
  79     // eslint-disable-next-line no-unused-vars
  80     fs.watchFile(this._getAuthorizationFile(), (current, previous) => {
  81       try {
  82         logger.debug(this._basicFormatLog() + ' Authorization file ' + this._getAuthorizationFile() + ' have changed, reload');
  83         // Initialize _authorizedTags
  84         this._authorizedTags = this._loadAndGetAuthorizedTags();
  85       } catch (error) {
  86         logger.error(this._basicFormatLog() + ' Authorization file monitoring error: ' + error);
  87       }
  88     });
  89   }
  90
  91   _startStationTemplateFileMonitoring() {
  92     // eslint-disable-next-line no-unused-vars
  93     fs.watchFile(this._stationTemplateFile, (current, previous) => {
  94       try {
  95         logger.debug(this._basicFormatLog() + ' Template file ' + this._stationTemplateFile + ' have changed, reload');
  96         // Initialize
  97         this._initialize();
  98       } catch (error) {
  99         logger.error(this._basicFormatLog() + ' Charging station template file monitoring error: ' + error);
 100       }
 101     });
 102   }
 103
 104   _getSupervisionURL() {
 105     const supervisionUrls = Utils.cloneJSonDocument(this._stationInfo.supervisionURL ? this._stationInfo.supervisionURL : Configuration.getSupervisionURLs());
 106     let indexUrl = 0;
 107     if (Array.isArray(supervisionUrls)) {
 108       if (Configuration.getDistributeStationToTenantEqually()) {
 109         indexUrl = this._index % supervisionUrls.length;
 110       } else {
 111         // Get a random url
 112         indexUrl = Math.floor(Math.random() * supervisionUrls.length);
 113       }
 114       return supervisionUrls[indexUrl];
 115     }
 116     return supervisionUrls;
 117   }
 118
 119   _getStationName(stationTemplate) {
 120     return stationTemplate.fixedName ? stationTemplate.baseName : stationTemplate.baseName + '-' + ('000000000' + this._index).substr(('000000000' + this._index).length - 4);
 121   }
 122
 123   _getAuthorizeRemoteTxRequests() {
 124     const authorizeRemoteTxRequests = this._getConfigurationKey('AuthorizeRemoteTxRequests');
 125     return authorizeRemoteTxRequests ? Utils.convertToBoolean(authorizeRemoteTxRequests.value) : false;
 126   }
 127
 128   _getLocalAuthListEnabled() {
 129     const localAuthListEnabled = this._getConfigurationKey('LocalAuthListEnabled');
 130     return localAuthListEnabled ? Utils.convertToBoolean(localAuthListEnabled.value) : false;
 131   }
 132
 133   _buildStationInfo() {
 134     let stationTemplateFromFile;
 135     try {
 136       // Load template file
 137       const fileDescriptor = fs.openSync(this._stationTemplateFile, 'r');
 138       stationTemplateFromFile = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8'));
 139       fs.closeSync(fileDescriptor);
 140     } catch (error) {
 141       logger.error(this._basicFormatLog() + ' Template file loading error: ' + error);
 142     }
 143     const stationTemplate = stationTemplateFromFile || {};
 144     if (Array.isArray(stationTemplateFromFile.power)) {
 145       stationTemplate.maxPower = stationTemplateFromFile.power[Math.floor(Math.random() * stationTemplateFromFile.power.length)];
 146     } else {
 147       stationTemplate.maxPower = stationTemplateFromFile.power;
 148     }
 149     stationTemplate.name = this._getStationName(stationTemplateFromFile);
 150     return stationTemplate;
 151   }
 152
 153   async start() {
 154     this._url = this._supervisionUrl + '/' + this._stationInfo.name;
 155     this._wsConnection = new WebSocket(this._url, 'ocpp1.6');
 156     logger.info(this._basicFormatLog() + ' Will communicate with ' + this._supervisionUrl);
 157     // Monitor authorization file
 158     this._startAuthorizationFileMonitoring();
 159     // Monitor station template file
 160     this._startStationTemplateFileMonitoring();
 161     // Handle Socket incoming messages
 162     this._wsConnection.on('message', this.onMessage.bind(this));
 163     // Handle Socket error
 164     this._wsConnection.on('error', this.onError.bind(this));
 165     // Handle Socket close
 166     this._wsConnection.on('close', this.onClose.bind(this));
 167     // Handle Socket opening connection
 168     this._wsConnection.on('open', this.onOpen.bind(this));
 169     // Handle Socket ping
 170     this._wsConnection.on('ping', this.onPing.bind(this));
 171   }
 172
 173   onOpen() {
 174     logger.info(`${this._basicFormatLog()} Is connected to server through ${this._url}`);
 175     if (!this._heartbeatInterval) {
 176       // Send BootNotification
 177       try {
 178         this.sendMessage(Utils.generateUUID(), this._bootNotificationMessage, Constants.OCPP_JSON_CALL_MESSAGE, 'BootNotification');
 179       } catch (error) {
 180         logger.error(this._basicFormatLog() + ' Send boot notification error: ' + error);
 181       }
 182     }
 183     if (this._isSocketRestart) {
 184       this._basicStartMessageSequence();
 185       if (this._messageQueue.length > 0) {
 186         this._messageQueue.forEach((message) => {
 187           if (this._wsConnection.readyState === WebSocket.OPEN) {
 188             this._wsConnection.send(message);
 189           }
 190         });
 191       }
 192     }
 193     this._autoReconnectRetryCount = 0;
 194     this._isSocketRestart = false;
 195   }
 196
 197   onError(error) {
 198     switch (error) {
 199       case 'ECONNREFUSED':
 200         this._isSocketRestart = true;
 201         this._reconnect(error);
 202         break;
 203       default:
 204         logger.error(this._basicFormatLog() + ' Socket error: ' + error);
 205         break;
 206     }
 207   }
 208
 209   onClose(error) {
 210     switch (error) {
 211       case 1000: // Normal close
 212       case 1005:
 213         logger.info(this._basicFormatLog() + ' Socket normally closed ' + error);
 214         this._autoReconnectRetryCount = 0;
 215         break;
 216       default: // Abnormal close
 217         this._isSocketRestart = true;
 218         this._reconnect(error);
 219         break;
 220     }
 221   }
 222
 223   onPing() {
 224     logger.debug(this._basicFormatLog() + ' Has received a WS ping (rfc6455) from the server');
 225   }
 226
 227   async onMessage(message) {
 228     let [messageType, messageId, commandName, commandPayload, errorDetails] = [0, '', Constants.ENTITY_CHARGING_STATION, '', ''];
 229     try {
 230       // Parse the message
 231       [messageType, messageId, commandName, commandPayload, errorDetails] = JSON.parse(message);
 232
 233       // Check the Type of message
 234       switch (messageType) {
 235         // Incoming Message
 236         case Constants.OCPP_JSON_CALL_MESSAGE:
 237           // Process the call
 238           this._statistics.addMessage(commandName);
 239           await this.handleRequest(messageId, commandName, commandPayload);
 240           break;
 241         // Outcome Message
 242         case Constants.OCPP_JSON_CALL_RESULT_MESSAGE:
 243           // Respond
 244           // eslint-disable-next-line no-case-declarations
 245           let responseCallback; let requestPayload;
 246           if (Utils.isIterable(this._requests[messageId])) {
 247             [responseCallback, , requestPayload] = this._requests[messageId];
 248           } else {
 249             throw new Error(`Response request for unknown message id ${messageId} is not iterable`);
 250           }
 251           if (!responseCallback) {
 252             // Error
 253             throw new Error(`Response for unknown message id ${messageId}`);
 254           }
 255           delete this._requests[messageId];
 256           // this._statistics.addMessage(commandName)
 257           responseCallback(commandName, requestPayload);
 258           break;
 259         // Error Message
 260         case Constants.OCPP_JSON_CALL_ERROR_MESSAGE:
 261           if (!this._requests[messageId]) {
 262             // Error
 263             throw new Error(`Error for unknown message id ${messageId}`);
 264           }
 265           // eslint-disable-next-line no-case-declarations
 266           let rejectCallback;
 267           if (Utils.isIterable(this._requests[messageId])) {
 268             [, rejectCallback] = this._requests[messageId];
 269           } else {
 270             throw new Error(`Error request for unknown message id ${messageId} is not iterable`);
 271           }
 272           delete this._requests[messageId];
 273           rejectCallback(new OCPPError(commandName, commandPayload, errorDetails));
 274           break;
 275         // Error
 276         default:
 277           throw new Error(`Wrong message type ${messageType}`);
 278       }
 279     } catch (error) {
 280       // Log
 281       logger.error('%s Incoming message %j processing error %s on request content %s', this._basicFormatLog(), message, error, this._requests[messageId]);
 282       // Send error
 283       // await this.sendError(messageId, error);
 284     }
 285   }
 286
 287   // eslint-disable-next-line class-methods-use-this
 288   async _startHeartbeat(self) {
 289     if (self._heartbeatInterval && !self._heartbeatSetInterval) {
 290       self._heartbeatSetInterval = setInterval(() => {
 291         try {
 292           const payload = {
 293             currentTime: new Date().toISOString(),
 294           };
 295           self.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'Heartbeat');
 296         } catch (error) {
 297           logger.error(self._basicFormatLog() + ' Send heartbeat error: ' + error);
 298         }
 299       }, self._heartbeatInterval);
 300       logger.info(self._basicFormatLog() + ' Heartbeat started every ' + self._heartbeatInterval + 'ms');
 301     } else {
 302       logger.error(self._basicFormatLog() + ' Heartbeat interval undefined, not starting the heartbeat');
 303     }
 304   }
 305
 306   _reconnect(error) {
 307     logger.error(this._basicFormatLog() + ' Socket: abnormally closed', error);
 308     // Stop heartbeat
 309     if (this._heartbeatSetInterval) {
 310       clearInterval(this._heartbeatSetInterval);
 311       this._heartbeatSetInterval = null;
 312     }
 313     // Stop the ATG if needed
 314     if (Utils.convertToBoolean(this._stationInfo.AutomaticTransactionGenerator.enable) &&
 315       Utils.convertToBoolean(this._stationInfo.AutomaticTransactionGenerator.stopOnConnectionFailure) &&
 316       this._automaticTransactionGeneration &&
 317       !this._automaticTransactionGeneration.timeToStop) {
 318       this._automaticTransactionGeneration.stop();
 319     }
 320     if (this._autoReconnectTimeout !== 0 &&
 321       (this._autoReconnectRetryCount < this._autoReconnectMaxRetries || this._autoReconnectMaxRetries === -1)) {
 322       logger.error(`${this._basicFormatLog()} Socket: connection retry with timeout ${this._autoReconnectTimeout}ms`);
 323       this._autoReconnectRetryCount++;
 324       setTimeout(() => {
 325         logger.error(this._basicFormatLog() + ' Socket: reconnecting try #' + this._autoReconnectRetryCount);
 326         this.start();
 327       }, this._autoReconnectTimeout);
 328     } else if (this._autoReconnectTimeout !== 0 || this._autoReconnectMaxRetries !== -1) {
 329       logger.error(`${this._basicFormatLog()} Socket: max retries reached (${this._autoReconnectRetryCount}) or retry disabled (${this._autoReconnectTimeout})`);
 330     }
 331   }
 332
 333   send(command, messageType = Constants.OCPP_JSON_CALL_MESSAGE) {
 334     // Send Message
 335     return this.sendMessage(Utils.generateUUID(), command, messageType);
 336   }
 337
 338   sendError(messageId, err) {
 339     // Check exception: only OCPP error are accepted
 340     const error = err instanceof OCPPError ? err : new OCPPError(Constants.OCPP_ERROR_INTERNAL_ERROR, err.message);
 341     // Send error
 342     return this.sendMessage(messageId, error, Constants.OCPP_JSON_CALL_ERROR_MESSAGE);
 343   }
 344
 345   async sendStatusNotification(connectorId, status, errorCode = 'NoError') {
 346     try {
 347       const payload = {
 348         connectorId,
 349         errorCode,
 350         status,
 351       };
 352       await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StatusNotification');
 353     } catch (error) {
 354       logger.error(this._basicFormatLog() + ' Send status error: ' + error);
 355     }
 356   }
 357
 358   async sendStatusNotificationWithTimeout(connectorId, status, errorCode = 'NoError', timeout = Constants.STATUS_NOTIFICATION_TIMEOUT) {
 359     setTimeout(() => this.sendStatusNotification(connectorId, status, errorCode), timeout);
 360   }
 361
 362   sendMessage(messageId, command, messageType = Constants.OCPP_JSON_CALL_RESULT_MESSAGE, commandName = '') {
 363     // Send a message through wsConnection
 364     const self = this;
 365     // Create a promise
 366     return new Promise((resolve, reject) => {
 367       let messageToSend;
 368       // Type of message
 369       switch (messageType) {
 370         // Request
 371         case Constants.OCPP_JSON_CALL_MESSAGE:
 372           this._statistics.addMessage(commandName);
 373           // Build request
 374           this._requests[messageId] = [responseCallback, rejectCallback, command];
 375           messageToSend = JSON.stringify([messageType, messageId, commandName, command]);
 376           break;
 377         // Response
 378         case Constants.OCPP_JSON_CALL_RESULT_MESSAGE:
 379           // Build response
 380           messageToSend = JSON.stringify([messageType, messageId, command]);
 381           break;
 382         // Error Message
 383         case Constants.OCPP_JSON_CALL_ERROR_MESSAGE:
 384           // Build Message
 385           this._statistics.addMessage(`Error ${command.code}`);
 386           messageToSend = JSON.stringify([messageType, messageId, command.code ? command.code : Constants.OCPP_ERROR_GENERIC_ERROR, command.message ? command.message : '', command.details ? command.details : {}]);
 387           break;
 388       }
 389       // Check if wsConnection is ready
 390       if (this._wsConnection.readyState === WebSocket.OPEN) {
 391         // Yes: Send Message
 392         this._wsConnection.send(messageToSend);
 393       } else {
 394         // Buffer message until connection is back
 395         this._messageQueue.push(messageToSend);
 396       }
 397       // Request?
 398       if (messageType !== Constants.OCPP_JSON_CALL_MESSAGE) {
 399         // Yes: send Ok
 400         resolve();
 401       } else if (this._wsConnection.readyState === WebSocket.OPEN) {
 402         // Send timeout in case connection is open otherwise wait for ever
 403         // FIXME: Handle message on timeout
 404         setTimeout(() => rejectCallback(`Timeout for message ${messageId}`), Constants.OCPP_SOCKET_TIMEOUT);
 405       }
 406
 407       // Function that will receive the request's response
 408       function responseCallback(payload, requestPayload) {
 409         self._statistics.addMessage(commandName, true);
 410         const responseCallbackFn = 'handleResponse' + commandName;
 411         if (typeof self[responseCallbackFn] === 'function') {
 412           self[responseCallbackFn](payload, requestPayload, self);
 413         } else {
 414           logger.debug(self._basicFormatLog() + ' Trying to call an undefined response callback function: ' + responseCallbackFn);
 415         }
 416         // Send the response
 417         resolve(payload);
 418       }
 419
 420       // Function that will receive the request's rejection
 421       function rejectCallback(reason) {
 422         // Build Exception
 423         // eslint-disable-next-line no-empty-function
 424         self._requests[messageId] = [() => { }, () => { }, '']; // Properly format the request
 425         const error = reason instanceof OCPPError ? reason : new Error(reason);
 426         // Send error
 427         reject(error);
 428       }
 429     });
 430   }
 431
 432   async _basicStartMessageSequence() {
 433     // Start heartbeat
 434     this._startHeartbeat(this);
 435     // Build connectors
 436     if (!this._connectors) {
 437       this._connectors = {};
 438       const connectorsConfig = Utils.cloneJSonDocument(this._stationInfo.Connectors);
 439       // Determine number of customized connectors
 440       let lastConnector;
 441       for (lastConnector in connectorsConfig) {
 442         // Add connector 0, OCPP specification violation that for example KEBA have
 443         if (Utils.convertToInt(lastConnector) === 0 && Utils.convertToBoolean(this._stationInfo.useConnectorId0) &&
 444             connectorsConfig[lastConnector]) {
 445           this._connectors[lastConnector] = connectorsConfig[lastConnector];
 446         }
 447       }
 448       let maxConnectors = 0;
 449       if (Array.isArray(this._stationInfo.numberOfConnectors)) {
 450         // Generate some connectors
 451         maxConnectors = this._stationInfo.numberOfConnectors[(this._index - 1) % this._stationInfo.numberOfConnectors.length];
 452       } else {
 453         maxConnectors = this._stationInfo.numberOfConnectors;
 454       }
 455       this._addConfigurationKey('NumberOfConnectors', maxConnectors, true);
 456       // Generate all connectors
 457       for (let index = 1; index <= maxConnectors; index++) {
 458         const randConnectorID = Utils.convertToBoolean(this._stationInfo.randomConnectors) ? Utils.getRandomInt(lastConnector, 1) : index;
 459         this._connectors[index] = connectorsConfig[randConnectorID];
 460       }
 461     }
 462
 463     for (const connector in this._connectors) {
 464       if (!this._connectors[connector].transactionStarted) {
 465         if (this._connectors[connector].bootStatus) {
 466           this.sendStatusNotificationWithTimeout(connector, this._connectors[connector].bootStatus);
 467         } else {
 468           this.sendStatusNotificationWithTimeout(connector, 'Available');
 469         }
 470       } else {
 471         this.sendStatusNotificationWithTimeout(connector, 'Charging');
 472       }
 473     }
 474
 475     if (Utils.convertToBoolean(this._stationInfo.AutomaticTransactionGenerator.enable)) {
 476       if (!this._automaticTransactionGeneration) {
 477         this._automaticTransactionGeneration = new AutomaticTransactionGenerator(this);
 478       }
 479       if (this._automaticTransactionGeneration.timeToStop) {
 480         this._automaticTransactionGeneration.start();
 481       }
 482     }
 483     this._statistics.start();
 484   }
 485
 486   _resetTransactionOnConnector(connectorID) {
 487     this._connectors[connectorID].transactionStarted = false;
 488     this._connectors[connectorID].transactionId = null;
 489     this._connectors[connectorID].lastConsumptionValue = -1;
 490     this._connectors[connectorID].lastSoC = -1;
 491     if (this._connectors[connectorID].transactionInterval) {
 492       clearInterval(this._connectors[connectorID].transactionInterval);
 493     }
 494   }
 495
 496   handleResponseBootNotification(payload) {
 497     if (payload.status === 'Accepted') {
 498       this._heartbeatInterval = payload.interval * 1000;
 499       this._addConfigurationKey('HeartBeatInterval', Utils.convertToInt(payload.interval));
 500       this._addConfigurationKey('HeartbeatInterval', Utils.convertToInt(payload.interval), false, false);
 501       this._basicStartMessageSequence();
 502     } else {
 503       logger.info(this._basicFormatLog() + ' Boot Notification rejected');
 504     }
 505   }
 506
 507   handleResponseStartTransaction(payload, requestPayload) {
 508     // Set connector transaction related attributes
 509     this._connectors[requestPayload.connectorId].transactionStarted = false;
 510     this._connectors[requestPayload.connectorId].idTag = requestPayload.idTag;
 511
 512     if (payload.idTagInfo.status === 'Accepted') {
 513       for (const connector in this._connectors) {
 514         if (Utils.convertToInt(connector) === Utils.convertToInt(requestPayload.connectorId)) {
 515           this._connectors[connector].transactionStarted = true;
 516           this._connectors[connector].transactionId = payload.transactionId;
 517           this._connectors[connector].lastConsumptionValue = 0;
 518           this._connectors[connector].lastSoC = 0;
 519           logger.info(this._basicFormatLog() + ' Transaction ' + this._connectors[connector].transactionId + ' STARTED on ' + this._stationInfo.name + '#' + requestPayload.connectorId + ' for idTag ' + requestPayload.idTag);
 520           this.sendStatusNotification(requestPayload.connectorId, 'Charging');
 521           const configuredMeterValueSampleInterval = this._getConfigurationKey('MeterValueSampleInterval');
 522           this.startMeterValues(requestPayload.connectorId,
 523             configuredMeterValueSampleInterval ? configuredMeterValueSampleInterval.value * 1000 : 60000,
 524             this);
 525         }
 526       }
 527     } else {
 528       logger.error(this._basicFormatLog() + ' Starting transaction id ' + payload.transactionId + ' REJECTED with status ' + payload.idTagInfo.status + ', idTag ' + requestPayload.idTag);
 529       for (const connector in this._connectors) {
 530         if (Utils.convertToInt(connector) === Utils.convertToInt(requestPayload.connectorId)) {
 531           this._resetTransactionOnConnector(connector);
 532         }
 533       }
 534       this.sendStatusNotification(requestPayload.connectorId, 'Available');
 535     }
 536   }
 537
 538   handleResponseStopTransaction(payload, requestPayload) {
 539     if (payload.idTagInfo && payload.idTagInfo.status) {
 540       logger.debug(this._basicFormatLog() + ' Stop transaction ' + requestPayload.transactionId + ' response status: ' + payload.idTagInfo.status);
 541     } else {
 542       logger.debug(this._basicFormatLog() + ' Stop transaction ' + requestPayload.transactionId + ' response status: Unknown');
 543     }
 544   }
 545
 546   handleResponseStatusNotification(payload, requestPayload) {
 547     logger.debug(this._basicFormatLog() + ' Status notification response received: %j to status notification request: %j', payload, requestPayload);
 548   }
 549
 550   handleResponseMeterValues(payload, requestPayload) {
 551     logger.debug(this._basicFormatLog() + ' MeterValues response received: %j to MeterValues request: %j', payload, requestPayload);
 552   }
 553
 554   handleResponseHeartbeat(payload, requestPayload) {
 555     logger.debug(this._basicFormatLog() + ' Heartbeat response received: %j to Heartbeat request: %j', payload, requestPayload);
 556   }
 557
 558   async handleRequest(messageId, commandName, commandPayload) {
 559     let result;
 560     this._statistics.addMessage(commandName, true);
 561     // Call
 562     if (typeof this['handle' + commandName] === 'function') {
 563       try {
 564         // Call the method
 565         result = await this['handle' + commandName](commandPayload);
 566       } catch (error) {
 567         // Log
 568         logger.error(this._basicFormatLog() + ' Handle request error: ' + error);
 569         // Send back response to inform backend
 570         await this.sendError(messageId, error);
 571       }
 572     } else {
 573       // Throw exception
 574       await this.sendError(messageId, new OCPPError(Constants.OCPP_ERROR_NOT_IMPLEMENTED, 'Not implemented', {}));
 575       throw new Error(`${commandName} is not implemented ${JSON.stringify(commandPayload, null, ' ')}`);
 576     }
 577     // Send response
 578     await this.sendMessage(messageId, result, Constants.OCPP_JSON_CALL_RESULT_MESSAGE);
 579   }
 580
 581   _getConfigurationKey(key) {
 582     return this._configuration.configurationKey.find((configElement) => configElement.key === key);
 583   }
 584
 585   _addConfigurationKey(key, value, readonly = false, visible = true) {
 586     const keyFound = this._getConfigurationKey(key);
 587     if (!keyFound) {
 588       this._configuration.configurationKey.push({
 589         key,
 590         readonly,
 591         value,
 592         visible,
 593       });
 594     }
 595   }
 596
 597   _setConfigurationKeyValue(key, value) {
 598     const keyFound = this._getConfigurationKey(key);
 599     if (keyFound) {
 600       this._configuration.configurationKey.key = value;
 601     }
 602   }
 603
 604   async handleGetConfiguration(commandPayload) {
 605     const configurationKey = [];
 606     const unknownKey = [];
 607     if (Utils.isEmptyArray(commandPayload.key)) {
 608       for (const configuration of this._configuration.configurationKey) {
 609         if (Utils.isUndefined(configuration.visible)) {
 610           configuration.visible = true;
 611         } else {
 612           configuration.visible = Utils.convertToBoolean(configuration.visible);
 613         }
 614         if (!configuration.visible) {
 615           continue;
 616         }
 617         configurationKey.push({
 618           key: configuration.key,
 619           readonly: configuration.readonly,
 620           value: configuration.value,
 621         });
 622       }
 623     } else {
 624       for (const configuration of commandPayload.key) {
 625         const keyFound = this._getConfigurationKey(configuration);
 626         if (keyFound) {
 627           if (Utils.isUndefined(keyFound.visible)) {
 628             keyFound.visible = true;
 629           } else {
 630             keyFound.visible = Utils.convertToBoolean(configuration.visible);
 631           }
 632           if (!keyFound.visible) {
 633             continue;
 634           }
 635           configurationKey.push({
 636             key: keyFound.key,
 637             readonly: keyFound.readonly,
 638             value: keyFound.value,
 639           });
 640         } else {
 641           unknownKey.push(configuration);
 642         }
 643       }
 644     }
 645     return {
 646       configurationKey,
 647       unknownKey,
 648     };
 649   }
 650
 651   async handleChangeConfiguration(commandPayload) {
 652     const keyToChange = this._getConfigurationKey(commandPayload.key);
 653     if (!keyToChange) {
 654       return {status: Constants.OCPP_ERROR_NOT_SUPPORTED};
 655     } else if (keyToChange && Utils.convertToBoolean(keyToChange.readonly)) {
 656       return Constants.OCPP_RESPONSE_REJECTED;
 657     } else if (keyToChange && !Utils.convertToBoolean(keyToChange.readonly)) {
 658       const keyIndex = this._configuration.configurationKey.indexOf(keyToChange);
 659       this._configuration.configurationKey[keyIndex].value = commandPayload.value;
 660       if (keyToChange.key === 'HeartBeatInterval' || keyToChange === 'HeartbeatInterval') {
 661         this._heartbeatInterval = Utils.convertToInt(commandPayload.value) * 1000;
 662         // Stop heartbeat
 663         if (this._heartbeatSetInterval) {
 664           clearInterval(this._heartbeatSetInterval);
 665           this._heartbeatSetInterval = null;
 666         }
 667         // Start heartbeat
 668         this._startHeartbeat(this);
 669       }
 670       if (Utils.convertToBoolean(keyToChange.reboot)) {
 671         return Constants.OCPP_RESPONSE_REBOOT_REQUIRED;
 672       }
 673       return Constants.OCPP_RESPONSE_ACCEPTED;
 674     }
 675   }
 676
 677   async handleRemoteStartTransaction(commandPayload) {
 678     const transactionConnectorID = commandPayload.connectorId ? commandPayload.connectorId : '1';
 679     if (this.hasAuthorizedTags() && this._getLocalAuthListEnabled() && this._getAuthorizeRemoteTxRequests()) {
 680       // Check if authorized
 681       if (this._authorizedTags.find((value) => value === commandPayload.idTag)) {
 682         // Authorization successful start transaction
 683         this.sendStartTransactionWithTimeout(transactionConnectorID, commandPayload.idTag, Constants.START_TRANSACTION_TIMEOUT);
 684         logger.debug(this._basicFormatLog() + ' Transaction remotely STARTED on ' + this._stationInfo.name + '#' + transactionConnectorID + ' for idTag ' + commandPayload.idTag);
 685         return Constants.OCPP_RESPONSE_ACCEPTED;
 686       }
 687       logger.error(this._basicFormatLog() + ' Remote starting transaction REJECTED with status ' + commandPayload.idTagInfo.status + ', idTag ' + commandPayload.idTag);
 688       return Constants.OCPP_RESPONSE_REJECTED;
 689     }
 690     // No local authorization check required => start transaction
 691     this.sendStartTransactionWithTimeout(transactionConnectorID, commandPayload.idTag, Constants.START_TRANSACTION_TIMEOUT);
 692     logger.debug(this._basicFormatLog() + ' Transaction remotely STARTED on ' + this._stationInfo.name + '#' + transactionConnectorID + ' for idTag ' + commandPayload.idTag);
 693     return Constants.OCPP_RESPONSE_ACCEPTED;
 694   }
 695
 696   async handleRemoteStopTransaction(commandPayload) {
 697     for (const connector in this._connectors) {
 698       if (this._connectors[connector].transactionId === commandPayload.transactionId) {
 699         this.sendStopTransaction(commandPayload.transactionId, connector);
 700       }
 701     }
 702     return Constants.OCPP_RESPONSE_ACCEPTED;
 703   }
 704
 705   async sendStartTransaction(connectorID, idTag) {
 706     try {
 707       const payload = {
 708         connectorId: connectorID,
 709         idTag,
 710         meterStart: 0,
 711         timestamp: new Date().toISOString(),
 712       };
 713       return await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StartTransaction');
 714     } catch (error) {
 715       logger.error(this._basicFormatLog() + ' Send start transaction error: ' + error);
 716       this._resetTransactionOnConnector(connectorID);
 717       throw error;
 718     }
 719   }
 720   async sendStartTransactionWithTimeout(connectorID, idTag, timeout) {
 721     setTimeout(() => this.sendStartTransaction(connectorID, idTag), timeout);
 722   }
 723
 724   async sendStopTransaction(transactionId, connectorID) {
 725     try {
 726       const payload = {
 727         transactionId,
 728         meterStop: 0,
 729         timestamp: new Date().toISOString(),
 730       };
 731       await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StopTransaction');
 732       logger.info(this._basicFormatLog() + ' Transaction ' + this._connectors[connectorID].transactionId + ' STOPPED on ' + this._stationInfo.name + '#' + connectorID);
 733       this.sendStatusNotification(connectorID, 'Available');
 734     } catch (error) {
 735       logger.error(this._basicFormatLog() + ' Send stop transaction error: ' + error);
 736       throw error;
 737     } finally {
 738       this._resetTransactionOnConnector(connectorID);
 739     }
 740   }
 741
 742   // eslint-disable-next-line class-methods-use-this
 743   async sendMeterValues(connectorID, interval, self) {
 744     try {
 745       const sampledValueLcl = {
 746         timestamp: new Date().toISOString(),
 747       };
 748       const meterValuesClone = Utils.cloneJSonDocument(self._getConnector(connectorID).MeterValues);
 749       if (Array.isArray(meterValuesClone)) {
 750         sampledValueLcl.sampledValue = meterValuesClone;
 751       } else {
 752         sampledValueLcl.sampledValue = [meterValuesClone];
 753       }
 754       for (let index = 0; index < sampledValueLcl.sampledValue.length; index++) {
 755         if (sampledValueLcl.sampledValue[index].measurand && sampledValueLcl.sampledValue[index].measurand === 'SoC') {
 756           sampledValueLcl.sampledValue[index].value = Utils.getRandomInt(100);
 757           if (sampledValueLcl.sampledValue[index].value > 100) {
 758             logger.info(self._basicFormatLog() + ' MeterValues measurand: ' +
 759               sampledValueLcl.sampledValue[index].measurand ? sampledValueLcl.sampledValue[index].measurand : 'Energy.Active.Import.Register' +
 760               ', value: ' + sampledValueLcl.sampledValue[index].value);
 761           }
 762         } else {
 763           // Persist previous value in connector
 764           const connector = self._connectors[connectorID];
 765           let consumption;
 766           consumption = Utils.getRandomInt(self._stationInfo.maxPower / 3600000 * interval);
 767           if (connector && connector.lastConsumptionValue >= 0) {
 768             connector.lastConsumptionValue += consumption;
 769           } else {
 770             connector.lastConsumptionValue = 0;
 771           }
 772           consumption = Math.round(connector.lastConsumptionValue * 3600 / interval);
 773           logger.info(self._basicFormatLog() + ' MeterValues: connectorID ' + connectorID + ', transaction ' + connector.transactionId + ', value ' + connector.lastConsumptionValue);
 774           sampledValueLcl.sampledValue[index].value = connector.lastConsumptionValue;
 775           if (sampledValueLcl.sampledValue[index].value > (self._stationInfo.maxPower * 3600 / interval) || sampledValueLcl.sampledValue[index].value < 500) {
 776             logger.info(self._basicFormatLog() + ' MeterValues measurand: ' +
 777               sampledValueLcl.sampledValue[index].measurand ? sampledValueLcl.sampledValue[index].measurand : 'Energy.Active.Import.Register' +
 778               ', value: ' + sampledValueLcl.sampledValue[index].value + '/' + (self._stationInfo.maxPower * 3600 / interval));
 779           }
 780         }
 781       }
 782
 783       const payload = {
 784         connectorId: connectorID,
 785         transactionId: self._connectors[connectorID].transactionId,
 786         meterValue: [sampledValueLcl],
 787       };
 788       await self.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'MeterValues');
 789     } catch (error) {
 790       logger.error(self._basicFormatLog() + ' Send MeterValues error: ' + error);
 791     }
 792   }
 793
 794   async startMeterValues(connectorID, interval, self) {
 795     if (!this._connectors[connectorID].transactionStarted) {
 796       logger.debug(`${self._basicFormatLog()} Trying to start MeterValues on connector ID ${connectorID} with no transaction started`);
 797     } else if (this._connectors[connectorID].transactionStarted && !this._connectors[connectorID].transactionId) {
 798       logger.debug(`${self._basicFormatLog()} Trying to start MeterValues on connector ID ${connectorID} with no transaction id`);
 799     }
 800     this._connectors[connectorID].transactionInterval = setInterval(async () => {
 801       const sendMeterValues = performance.timerify(this.sendMeterValues);
 802       this._performanceObserver.observe({
 803         entryTypes: ['function'],
 804       });
 805       await sendMeterValues(connectorID, interval, self);
 806     }, interval);
 807   }
 808
 809   hasAuthorizedTags() {
 810     return !Utils.isEmptyArray(this._authorizedTags);
 811   }
 812
 813   getRandomTagId() {
 814     const index = Math.floor(Math.random() * this._authorizedTags.length);
 815     return this._authorizedTags[index];
 816   }
 817
 818   _getConnector(number) {
 819     return this._stationInfo.Connectors[number];
 820   }
 821 }
 822
 823 module.exports = ChargingStation;