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bluetooth.service.ts
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bluetooth.service.ts
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import { Injectable, Logger } from '@nestjs/common';
import noble, { Peripheral } from '@abandonware/noble';
import util from 'util';
import { exec } from 'child_process';
import { BluetoothHealthIndicator } from './bluetooth.health';
import { BluetoothClassicConfig } from '../bluetooth-classic/bluetooth-classic.config';
import { ConfigService } from '../../config/config.service';
import { Device } from '../bluetooth-classic/device';
type BluetoothAdapterState = 'inquiry' | 'scan' | 'inactive';
const execPromise = util.promisify(exec);
const rssiRegex = new RegExp(/-?[0-9]+/);
@Injectable()
export class BluetoothService {
private readonly logger: Logger = new Logger(BluetoothService.name);
private readonly classicConfig: BluetoothClassicConfig;
private readonly adapterStates = new Map<number, BluetoothAdapterState>();
private lowEnergyAdapterId: number;
constructor(
private readonly configService: ConfigService,
private readonly healthIndicator: BluetoothHealthIndicator
) {
this.classicConfig = this.configService.get('bluetoothClassic');
}
/**
* Registers a callback function that will be invoked when a
* Bluetooth Low Energy peripheral advertisement was received.
*
* @param callback - Callback function that receives a peripheral
*/
onLowEnergyDiscovery(callback: (peripheral: Peripheral) => void): void {
if (this.lowEnergyAdapterId == undefined) {
this.setupNoble();
}
noble.on('discover', callback);
}
/**
* Queries for the RSSI of a Bluetooth device using the hcitool shell command.
*
* @param adapterId - HCI Adapter ID to use for queries
* @param address - Bluetooth MAC address
* @returns RSSI value
*/
async inquireClassicRssi(
adapterId: number,
address: string
): Promise<number> {
this.lockAdapter(adapterId);
this.logger.debug(`Querying for RSSI of ${address} using hcitool`);
try {
const output = await execPromise(
`hcitool -i hci${adapterId} cc "${address}" && hcitool -i hci${adapterId} rssi "${address}"`,
{
timeout: this.classicConfig.scanTimeLimit * 1000,
killSignal: 'SIGKILL',
}
);
const matches = output.stdout.match(rssiRegex);
this.healthIndicator.reportSuccess();
return matches?.length > 0 ? parseInt(matches[0], 10) : undefined;
} catch (e) {
if (e.signal === 'SIGKILL') {
this.logger.debug(
`Query of ${address} reached scan time limit, resetting hci${this.classicConfig.hciDeviceId}`
);
await this.resetHciDevice(adapterId);
// when not reachable a scan runs for 6s, so lower time limits might not be an error
if (this.classicConfig.scanTimeLimit >= 6) {
this.healthIndicator.reportError();
}
} else if (
e.message?.includes('Input/output') ||
e.message?.includes('I/O')
) {
this.logger.debug(e.message);
} else {
this.logger.error(e.message);
this.healthIndicator.reportError();
}
return undefined;
} finally {
this.unlockAdapter(adapterId);
}
}
/**
* Inquires device information of a Bluetooth peripheral.
*
* @param adapterId - HCI Adapter ID to use for queries
* @param address - Bluetooth MAC address
* @returns Device information
*/
async inquireClassicDeviceInfo(
adapterId: number,
address: string
): Promise<Device> {
this.lockAdapter(adapterId);
try {
const output = await execPromise(
`hcitool -i hci${adapterId} info "${address}"`
);
const nameMatches = /Device Name: (.+)/g.exec(output.stdout);
const manufacturerMatches = /OUI Company: (.+) \(.+\)/g.exec(
output.stdout
);
return {
address,
name: nameMatches ? nameMatches[1] : address,
manufacturer: manufacturerMatches ? manufacturerMatches[1] : undefined,
};
} catch (e) {
this.logger.error(e.message, e.stack);
return {
address,
name: address,
};
} finally {
this.unlockAdapter(adapterId);
}
}
/**
* Reset the hci (Bluetooth) device used for inquiries.
*/
protected async resetHciDevice(adapterId: number): Promise<void> {
try {
await execPromise(`hciconfig hci${adapterId} reset`);
} catch (e) {
this.logger.error(e.message);
}
}
/**
* Locks an adapter for an active inquiry.
*
* @param adapterId - HCI Device ID of the adapter to lock
*/
protected lockAdapter(adapterId: number): void {
if (this.adapterStates.get(adapterId) == 'scan') {
noble.stopScanning();
}
this.adapterStates.set(adapterId, 'inquiry');
}
/**
* Unlocks an adapter and returns it to scan or inactive state.
*
* @param adapterId - HCI Device ID of the adapter to unlock
*/
protected unlockAdapter(adapterId: number): void {
this.adapterStates.set(adapterId, 'inactive');
if (adapterId == this.lowEnergyAdapterId) {
this.handleAdapterStateChange(noble.state);
}
}
/**
* Sets up Noble hooks.
*/
private setupNoble(): void {
this.lowEnergyAdapterId = parseInt(process.env.NOBLE_HCI_DEVICE_ID) || 0;
noble.on('stateChange', this.handleAdapterStateChange.bind(this));
noble.on('warning', (message) => {
this.logger.warn(message);
});
}
/**
* Handles state adapter changes as reported by Noble.
*
* @param state - State of the HCI adapter
*/
private handleAdapterStateChange(state: string): void {
if (this.adapterStates.get(this.lowEnergyAdapterId) != 'inquiry') {
if (state === 'poweredOn') {
noble.startScanning([], true);
this.adapterStates.set(this.lowEnergyAdapterId, 'scan');
} else {
noble.stopScanning();
this.adapterStates.set(this.lowEnergyAdapterId, 'inactive');
}
}
}
}