X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=src%2Fcharging-station%2FChargingStation.ts;h=070707625771e3fffdc2a2fbda8bd8b5f1069561;hb=34eeb1fb097b9eda12531ff9024d2f9c0e627a28;hp=b52fb585a63c226b5998ea444158d0496c24a0c2;hpb=5e128725c7e0dae5e1c5819fb3160aec4c6db816;p=e-mobility-charging-stations-simulator.git diff --git a/src/charging-station/ChargingStation.ts b/src/charging-station/ChargingStation.ts index b52fb585..07070762 100644 --- a/src/charging-station/ChargingStation.ts +++ b/src/charging-station/ChargingStation.ts @@ -128,6 +128,7 @@ export class ChargingStation { private wsConnectionRestarted: boolean; private autoReconnectRetryCount: number; private templateFileWatcher!: fs.FSWatcher | undefined; + private templateFileHash!: string; private readonly sharedLRUCache: SharedLRUCache; private webSocketPingSetInterval!: NodeJS.Timeout; private readonly chargingStationWorkerBroadcastChannel: ChargingStationWorkerBroadcastChannel; @@ -265,6 +266,9 @@ export class ChargingStation { public getNumberOfConnectors(): number { if (this.hasEvses) { + if (this.evses.size === 0) { + throw new BaseError('Evses not initialized, cannot get number of connectors'); + } let numberOfConnectors = 0; for (const [evseId, evseStatus] of this.evses) { if (evseId > 0) { @@ -273,10 +277,16 @@ export class ChargingStation { } return numberOfConnectors; } + if (this.connectors.size === 0) { + throw new BaseError('Connectors not initialized, cannot get number of connectors'); + } return this.connectors.has(0) ? this.connectors.size - 1 : this.connectors.size; } public getNumberOfEvses(): number { + if (this.evses.size === 0) { + throw new BaseError('Evses not initialized, cannot get number of evses'); + } return this.evses.has(0) ? this.evses.size - 1 : this.evses.size; } @@ -303,8 +313,8 @@ export class ChargingStation { public getVoltageOut(stationInfo?: ChargingStationInfo): number | undefined { const defaultVoltageOut = ChargingStationUtils.getDefaultVoltageOut( this.getCurrentOutType(stationInfo), - this.templateFile, - this.logPrefix() + this.logPrefix(), + this.templateFile ); const localStationInfo: ChargingStationInfo = stationInfo ?? this.stationInfo; return !Utils.isUndefined(localStationInfo.voltageOut) @@ -328,7 +338,8 @@ export class ChargingStation { ? ACElectricUtils.powerTotal( this.getNumberOfPhases(), this.getVoltageOut(), - this.getAmperageLimitation() * this.getNumberOfConnectors() + this.getAmperageLimitation() * + (this.hasEvses ? this.getNumberOfEvses() : this.getNumberOfConnectors()) ) : DCElectricUtils.power(this.getVoltageOut(), this.getAmperageLimitation())) / this.powerDivider; @@ -366,6 +377,26 @@ export class ChargingStation { } } + public getNumberOfRunningTransactions(): number { + let trxCount = 0; + if (this.hasEvses) { + for (const evseStatus of this.evses.values()) { + for (const connectorStatus of evseStatus.connectors.values()) { + if (connectorStatus.transactionStarted === true) { + ++trxCount; + } + } + } + } else { + for (const connectorId of this.connectors.keys()) { + if (connectorId > 0 && this.getConnectorStatus(connectorId)?.transactionStarted === true) { + ++trxCount; + } + } + } + return trxCount; + } + public getOutOfOrderEndMeterValues(): boolean { return this.stationInfo?.outOfOrderEndMeterValues ?? false; } @@ -622,7 +653,7 @@ export class ChargingStation { this.templateFile } file have changed, reload` ); - this.sharedLRUCache.deleteChargingStationTemplate(this.stationInfo?.templateHash); + this.sharedLRUCache.deleteChargingStationTemplate(this.templateFileHash); // Initialize this.initialize(); // Restart the ATG @@ -669,7 +700,7 @@ export class ChargingStation { } this.sharedLRUCache.deleteChargingStationConfiguration(this.configurationFileHash); this.templateFileWatcher?.close(); - this.sharedLRUCache.deleteChargingStationTemplate(this.stationInfo?.templateHash); + this.sharedLRUCache.deleteChargingStationTemplate(this.templateFileHash); delete this.bootNotificationResponse; this.started = false; parentPort?.postMessage(MessageChannelUtils.buildStoppedMessage(this)); @@ -691,7 +722,7 @@ export class ChargingStation { public saveOcppConfiguration(): void { if (this.getOcppPersistentConfiguration()) { - this.saveConfiguration({ stationInfo: false, connectors: false, evses: false }); + this.saveConfiguration(); } } @@ -714,8 +745,7 @@ export class ChargingStation { } ): void { options.handshakeTimeout = options?.handshakeTimeout ?? this.getConnectionTimeout() * 1000; - params.closeOpened = params?.closeOpened ?? false; - params.terminateOpened = params?.terminateOpened ?? false; + params = { ...{ closeOpened: false, terminateOpened: false }, ...params }; if (this.started === false && this.starting === false) { logger.warn( `${this.logPrefix()} Cannot open OCPP connection to URL ${this.wsConnectionUrl.toString()} on stopped charging station` @@ -883,8 +913,8 @@ export class ChargingStation { private getTemplateFromFile(): ChargingStationTemplate | undefined { let template: ChargingStationTemplate; try { - if (this.sharedLRUCache.hasChargingStationTemplate(this.stationInfo?.templateHash)) { - template = this.sharedLRUCache.getChargingStationTemplate(this.stationInfo.templateHash); + if (this.sharedLRUCache.hasChargingStationTemplate(this.templateFileHash)) { + template = this.sharedLRUCache.getChargingStationTemplate(this.templateFileHash); } else { const measureId = `${FileType.ChargingStationTemplate} read`; const beginId = PerformanceStatistics.beginMeasure(measureId); @@ -897,6 +927,7 @@ export class ChargingStation { .update(JSON.stringify(template)) .digest('hex'); this.sharedLRUCache.setChargingStationTemplate(template); + this.templateFileHash = template.templateHash; } } catch (error) { FileUtils.handleFileException( @@ -911,21 +942,19 @@ export class ChargingStation { private getStationInfoFromTemplate(): ChargingStationInfo { const stationTemplate: ChargingStationTemplate | undefined = this.getTemplateFromFile(); - if (Utils.isNullOrUndefined(stationTemplate)) { - const errorMsg = `Failed to read charging station template file ${this.templateFile}`; - logger.error(`${this.logPrefix()} ${errorMsg}`); - throw new BaseError(errorMsg); - } - if (Utils.isEmptyObject(stationTemplate)) { - const errorMsg = `Empty charging station information from template file ${this.templateFile}`; - logger.error(`${this.logPrefix()} ${errorMsg}`); - throw new BaseError(errorMsg); - } + ChargingStationUtils.checkTemplateFile(stationTemplate, this.logPrefix(), this.templateFile); ChargingStationUtils.warnTemplateKeysDeprecation( - this.templateFile, stationTemplate, - this.logPrefix() + this.logPrefix(), + this.templateFile ); + if (stationTemplate?.Connectors) { + ChargingStationUtils.checkConnectorsConfiguration( + stationTemplate, + this.logPrefix(), + this.templateFile + ); + } const stationInfo: ChargingStationInfo = ChargingStationUtils.stationTemplateToStationInfo(stationTemplate); stationInfo.hashId = ChargingStationUtils.getHashId(this.index, stationTemplate); @@ -973,18 +1002,18 @@ export class ChargingStation { stationInfo.resetTime = !Utils.isNullOrUndefined(stationTemplate?.resetTime) ? stationTemplate.resetTime * 1000 : Constants.CHARGING_STATION_DEFAULT_RESET_TIME; - // Initialize evses or connectors if needed (FIXME: should be factored out) - this.initializeConnectorsOrEvses(stationInfo); stationInfo.maximumAmperage = this.getMaximumAmperage(stationInfo); - ChargingStationUtils.createStationInfoHash(stationInfo); return stationInfo; } private getStationInfoFromFile(): ChargingStationInfo | undefined { let stationInfo: ChargingStationInfo | undefined; - this.getStationInfoPersistentConfiguration() && - (stationInfo = this.getConfigurationFromFile()?.stationInfo); - stationInfo && ChargingStationUtils.createStationInfoHash(stationInfo); + if (this.getStationInfoPersistentConfiguration()) { + stationInfo = this.getConfigurationFromFile()?.stationInfo; + if (stationInfo) { + delete stationInfo?.infoHash; + } + } return stationInfo; } @@ -994,11 +1023,7 @@ export class ChargingStation { // Priority: // 1. charging station info from template // 2. charging station info from configuration file - // 3. charging station info attribute if (stationInfoFromFile?.templateHash === stationInfoFromTemplate.templateHash) { - if (this.stationInfo?.infoHash === stationInfoFromFile?.infoHash) { - return this.stationInfo; - } return stationInfoFromFile; } stationInfoFromFile && @@ -1012,7 +1037,7 @@ export class ChargingStation { private saveStationInfo(): void { if (this.getStationInfoPersistentConfiguration()) { - this.saveConfiguration({ ocppConfiguration: false, connectors: false, evses: false }); + this.saveConfiguration(); } } @@ -1025,16 +1050,19 @@ export class ChargingStation { } private handleUnsupportedVersion(version: OCPPVersion) { - const errMsg = `Unsupported protocol version '${version}' configured in template file ${this.templateFile}`; - logger.error(`${this.logPrefix()} ${errMsg}`); - throw new BaseError(errMsg); + const errorMsg = `Unsupported protocol version '${version}' configured in template file ${this.templateFile}`; + logger.error(`${this.logPrefix()} ${errorMsg}`); + throw new BaseError(errorMsg); } private initialize(): void { + const stationTemplate = this.getTemplateFromFile(); + ChargingStationUtils.checkTemplateFile(stationTemplate, this.logPrefix(), this.templateFile); this.configurationFile = path.join( path.dirname(this.templateFile.replace('station-templates', 'configurations')), - `${ChargingStationUtils.getHashId(this.index, this.getTemplateFromFile())}.json` + `${ChargingStationUtils.getHashId(this.index, stationTemplate)}.json` ); + this.initializeConnectorsOrEvsesFromTemplate(stationTemplate); this.stationInfo = this.getStationInfo(); if ( this.stationInfo.firmwareStatus === FirmwareStatus.Installing && @@ -1055,9 +1083,6 @@ export class ChargingStation { this.stationInfo.firmwareVersion = match?.join('.'); } this.saveStationInfo(); - // Avoid duplication of connectors or evses related information in RAM - delete this.stationInfo?.Connectors; - delete this.stationInfo?.Evses; this.configuredSupervisionUrl = this.getConfiguredSupervisionUrl(); if (this.getEnableStatistics() === true) { this.performanceStatistics = PerformanceStatistics.getInstance( @@ -1273,12 +1298,12 @@ export class ChargingStation { this.saveOcppConfiguration(); } - private initializeConnectorsOrEvses(stationInfo: ChargingStationInfo) { - if (stationInfo?.Connectors && !stationInfo?.Evses) { - this.initializeConnectors(stationInfo); - } else if (stationInfo?.Evses && !stationInfo?.Connectors) { - this.initializeEvses(stationInfo); - } else if (stationInfo?.Evses && stationInfo?.Connectors) { + private initializeConnectorsOrEvsesFromTemplate(stationTemplate: ChargingStationTemplate) { + if (stationTemplate?.Connectors && !stationTemplate?.Evses) { + this.initializeConnectorsFromTemplate(stationTemplate); + } else if (stationTemplate?.Evses && !stationTemplate?.Connectors) { + this.initializeEvsesFromTemplate(stationTemplate); + } else if (stationTemplate?.Evses && stationTemplate?.Connectors) { const errorMsg = `Connectors and evses defined at the same time in template file ${this.templateFile}`; logger.error(`${this.logPrefix()} ${errorMsg}`); throw new BaseError(errorMsg); @@ -1289,72 +1314,51 @@ export class ChargingStation { } } - private initializeConnectors(stationInfo: ChargingStationInfo): void { - if (!stationInfo?.Connectors && this.connectors.size === 0) { - const logMsg = `No already defined connectors and charging station information from template ${this.templateFile} with no connectors configuration defined`; - logger.error(`${this.logPrefix()} ${logMsg}`); - throw new BaseError(logMsg); + private initializeConnectorsFromTemplate(stationTemplate: ChargingStationTemplate): void { + if (!stationTemplate?.Connectors && this.connectors.size === 0) { + const errorMsg = `No already defined connectors and charging station information from template ${this.templateFile} with no connectors configuration defined`; + logger.error(`${this.logPrefix()} ${errorMsg}`); + throw new BaseError(errorMsg); } - if (!stationInfo?.Connectors[0]) { + if (!stationTemplate?.Connectors[0]) { logger.warn( `${this.logPrefix()} Charging station information from template ${ this.templateFile } with no connector id 0 configuration` ); } - if (stationInfo?.Connectors) { - const configuredMaxConnectors = - ChargingStationUtils.getConfiguredNumberOfConnectors(stationInfo); - ChargingStationUtils.checkConfiguredMaxConnectors( - configuredMaxConnectors, - this.templateFile, - this.logPrefix() - ); + if (stationTemplate?.Connectors) { + const { configuredMaxConnectors, templateMaxConnectors, templateMaxAvailableConnectors } = + ChargingStationUtils.checkConnectorsConfiguration( + stationTemplate, + this.logPrefix(), + this.templateFile + ); const connectorsConfigHash = crypto .createHash(Constants.DEFAULT_HASH_ALGORITHM) - .update(`${JSON.stringify(stationInfo?.Connectors)}${configuredMaxConnectors.toString()}`) + .update( + `${JSON.stringify(stationTemplate?.Connectors)}${configuredMaxConnectors.toString()}` + ) .digest('hex'); const connectorsConfigChanged = this.connectors?.size !== 0 && this.connectorsConfigurationHash !== connectorsConfigHash; if (this.connectors?.size === 0 || connectorsConfigChanged) { connectorsConfigChanged && this.connectors.clear(); this.connectorsConfigurationHash = connectorsConfigHash; - const templateMaxConnectors = ChargingStationUtils.getMaxNumberOfConnectors( - stationInfo.Connectors - ); - ChargingStationUtils.checkTemplateMaxConnectors( - templateMaxConnectors, - this.templateFile, - this.logPrefix() - ); - const templateMaxAvailableConnectors = stationInfo?.Connectors[0] - ? templateMaxConnectors - 1 - : templateMaxConnectors; - if ( - configuredMaxConnectors > templateMaxAvailableConnectors && - !stationInfo?.randomConnectors - ) { - logger.warn( - `${this.logPrefix()} Number of connectors exceeds the number of connector configurations in template ${ - this.templateFile - }, forcing random connector configurations affectation` - ); - stationInfo.randomConnectors = true; - } if (templateMaxConnectors > 0) { for (let connectorId = 0; connectorId <= configuredMaxConnectors; connectorId++) { if ( connectorId === 0 && - (!stationInfo?.Connectors[connectorId] || - this.getUseConnectorId0(stationInfo) === false) + (!stationTemplate?.Connectors[connectorId] || + this.getUseConnectorId0(stationTemplate) === false) ) { continue; } const templateConnectorId = - connectorId > 0 && stationInfo?.randomConnectors + connectorId > 0 && stationTemplate?.randomConnectors ? Utils.getRandomInteger(templateMaxAvailableConnectors, 1) : connectorId; - const connectorStatus = stationInfo?.Connectors[templateConnectorId]; + const connectorStatus = stationTemplate?.Connectors[templateConnectorId]; ChargingStationUtils.checkStationInfoConnectorStatus( templateConnectorId, connectorStatus, @@ -1382,43 +1386,43 @@ export class ChargingStation { } } - private initializeEvses(stationInfo: ChargingStationInfo): void { - if (!stationInfo?.Evses && this.evses.size === 0) { - const logMsg = `No already defined evses and charging station information from template ${this.templateFile} with no evses configuration defined`; - logger.error(`${this.logPrefix()} ${logMsg}`); - throw new BaseError(logMsg); + private initializeEvsesFromTemplate(stationTemplate: ChargingStationTemplate): void { + if (!stationTemplate?.Evses && this.evses.size === 0) { + const errorMsg = `No already defined evses and charging station information from template ${this.templateFile} with no evses configuration defined`; + logger.error(`${this.logPrefix()} ${errorMsg}`); + throw new BaseError(errorMsg); } - if (!stationInfo?.Evses[0]) { + if (!stationTemplate?.Evses[0]) { logger.warn( `${this.logPrefix()} Charging station information from template ${ this.templateFile } with no evse id 0 configuration` ); } - if (!stationInfo?.Evses[0]?.Connectors[0]) { + if (!stationTemplate?.Evses[0]?.Connectors[0]) { logger.warn( `${this.logPrefix()} Charging station information from template ${ this.templateFile } with evse id 0 with no connector id 0 configuration` ); } - if (stationInfo?.Evses) { + if (stationTemplate?.Evses) { const evsesConfigHash = crypto .createHash(Constants.DEFAULT_HASH_ALGORITHM) - .update(`${JSON.stringify(stationInfo?.Evses)}`) + .update(`${JSON.stringify(stationTemplate?.Evses)}`) .digest('hex'); const evsesConfigChanged = this.evses?.size !== 0 && this.evsesConfigurationHash !== evsesConfigHash; if (this.evses?.size === 0 || evsesConfigChanged) { evsesConfigChanged && this.evses.clear(); this.evsesConfigurationHash = evsesConfigHash; - const templateMaxEvses = ChargingStationUtils.getMaxNumberOfEvses(stationInfo?.Evses); + const templateMaxEvses = ChargingStationUtils.getMaxNumberOfEvses(stationTemplate?.Evses); if (templateMaxEvses > 0) { - for (const evse in stationInfo.Evses) { + for (const evse in stationTemplate.Evses) { const evseId = Utils.convertToInt(evse); this.evses.set(evseId, { connectors: ChargingStationUtils.buildConnectorsMap( - stationInfo?.Evses[evse]?.Connectors, + stationTemplate?.Evses[evse]?.Connectors, this.logPrefix(), this.templateFile ), @@ -1462,8 +1466,8 @@ export class ChargingStation { fs.readFileSync(this.configurationFile, 'utf8') ) as ChargingStationConfiguration; PerformanceStatistics.endMeasure(measureId, beginId); - this.configurationFileHash = configuration.configurationHash; this.sharedLRUCache.setChargingStationConfiguration(configuration); + this.configurationFileHash = configuration.configurationHash; } } catch (error) { FileUtils.handleFileException( @@ -1478,49 +1482,34 @@ export class ChargingStation { } private saveConnectorsStatus() { - if (this.getOcppPersistentConfiguration()) { - this.saveConfiguration({ stationInfo: false, ocppConfiguration: false, evses: false }); - } + this.saveConfiguration(); } private saveEvsesStatus() { - if (this.getOcppPersistentConfiguration()) { - this.saveConfiguration({ stationInfo: false, ocppConfiguration: false, connectors: false }); - } + this.saveConfiguration(); } - private saveConfiguration( - params: { - stationInfo?: boolean; - ocppConfiguration?: boolean; - connectors?: boolean; - evses?: boolean; - } = { stationInfo: true, ocppConfiguration: true, connectors: true, evses: true } - ): void { + private saveConfiguration(): void { if (this.configurationFile) { - params = { - ...params, - ...{ stationInfo: true, ocppConfiguration: true, connectors: true, evses: true }, - }; try { if (!fs.existsSync(path.dirname(this.configurationFile))) { fs.mkdirSync(path.dirname(this.configurationFile), { recursive: true }); } const configurationData: ChargingStationConfiguration = Utils.cloneObject(this.getConfigurationFromFile()) ?? {}; - if (params.stationInfo && this.stationInfo) { + if (this.getStationInfoPersistentConfiguration() && this.stationInfo) { configurationData.stationInfo = this.stationInfo; } - if (params.ocppConfiguration && this.ocppConfiguration?.configurationKey) { + if (this.getOcppPersistentConfiguration() && this.ocppConfiguration?.configurationKey) { configurationData.configurationKey = this.ocppConfiguration.configurationKey; } - if (params.connectors && this.connectors.size > 0) { + if (this.connectors.size > 0) { configurationData.connectorsStatus = [...this.connectors.values()].map( // eslint-disable-next-line @typescript-eslint/no-unused-vars ({ transactionSetInterval, ...connectorStatusRest }) => connectorStatusRest ); } - if (params.evses && this.evses.size > 0) { + if (this.evses.size > 0) { configurationData.evsesStatus = [...this.evses.values()].map((evseStatus) => { const status = { ...evseStatus, @@ -1547,8 +1536,8 @@ export class ChargingStation { fs.closeSync(fileDescriptor); PerformanceStatistics.endMeasure(measureId, beginId); this.sharedLRUCache.deleteChargingStationConfiguration(this.configurationFileHash); - this.configurationFileHash = configurationHash; this.sharedLRUCache.setChargingStationConfiguration(configurationData); + this.configurationFileHash = configurationHash; } else { logger.debug( `${this.logPrefix()} Not saving unchanged charging station configuration file ${ @@ -1751,7 +1740,7 @@ export class ChargingStation { private async onMessage(data: RawData): Promise { let request: IncomingRequest | Response | ErrorResponse; let messageType: number; - let errMsg: string; + let errorMsg: string; try { request = JSON.parse(data.toString()) as IncomingRequest | Response | ErrorResponse; if (Array.isArray(request) === true) { @@ -1773,9 +1762,9 @@ export class ChargingStation { // Unknown Message default: // eslint-disable-next-line @typescript-eslint/restrict-template-expressions - errMsg = `Wrong message type ${messageType}`; - logger.error(`${this.logPrefix()} ${errMsg}`); - throw new OCPPError(ErrorType.PROTOCOL_ERROR, errMsg); + errorMsg = `Wrong message type ${messageType}`; + logger.error(`${this.logPrefix()} ${errorMsg}`); + throw new OCPPError(ErrorType.PROTOCOL_ERROR, errorMsg); } parentPort?.postMessage(MessageChannelUtils.buildUpdatedMessage(this)); } else { @@ -1855,29 +1844,8 @@ export class ChargingStation { ); } - private getUseConnectorId0(stationInfo?: ChargingStationInfo): boolean { - const localStationInfo = stationInfo ?? this.stationInfo; - return localStationInfo?.useConnectorId0 ?? true; - } - - private getNumberOfRunningTransactions(): number { - let trxCount = 0; - if (this.hasEvses) { - for (const evseStatus of this.evses.values()) { - for (const connectorStatus of evseStatus.connectors.values()) { - if (connectorStatus.transactionStarted === true) { - trxCount++; - } - } - } - } else { - for (const connectorId of this.connectors.keys()) { - if (connectorId > 0 && this.getConnectorStatus(connectorId)?.transactionStarted === true) { - trxCount++; - } - } - } - return trxCount; + private getUseConnectorId0(stationTemplate?: ChargingStationTemplate): boolean { + return stationTemplate?.useConnectorId0 ?? true; } private async stopRunningTransactions(reason = StopTransactionReason.NONE): Promise { @@ -1920,25 +1888,18 @@ export class ChargingStation { // -1 for unlimited, 0 for disabling private getAutoReconnectMaxRetries(): number | undefined { - if (!Utils.isUndefined(this.stationInfo.autoReconnectMaxRetries)) { - return this.stationInfo.autoReconnectMaxRetries; - } - if (!Utils.isUndefined(Configuration.getAutoReconnectMaxRetries())) { - return Configuration.getAutoReconnectMaxRetries(); - } - return -1; + return ( + this.stationInfo.autoReconnectMaxRetries ?? Configuration.getAutoReconnectMaxRetries() ?? -1 + ); } // 0 for disabling private getRegistrationMaxRetries(): number | undefined { - if (!Utils.isUndefined(this.stationInfo.registrationMaxRetries)) { - return this.stationInfo.registrationMaxRetries; - } - return -1; + return this.stationInfo.registrationMaxRetries ?? -1; } private getPowerDivider(): number { - let powerDivider = this.getNumberOfConnectors(); + let powerDivider = this.hasEvses ? this.getNumberOfEvses() : this.getNumberOfConnectors(); if (this.stationInfo?.powerSharedByConnectors) { powerDivider = this.getNumberOfRunningTransactions(); } @@ -1951,7 +1912,7 @@ export class ChargingStation { case CurrentType.AC: return ACElectricUtils.amperagePerPhaseFromPower( this.getNumberOfPhases(stationInfo), - maximumPower / this.getNumberOfConnectors(), + maximumPower / (this.hasEvses ? this.getNumberOfEvses() : this.getNumberOfConnectors()), this.getVoltageOut(stationInfo) ); case CurrentType.DC: