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186
uni_modules/ak-sbsrv/utssdk/web/service-manager.uts
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186
uni_modules/ak-sbsrv/utssdk/web/service-manager.uts
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// 服务与特征值操作相关：服务发现、特征值读写、订阅
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import { BleService, BleCharacteristic } from '../interface.uts';
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import { BLE_SERVICE_PREFIXES } from './bluetooth_manager.uts';
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// Helper: normalize UUIDs (accept 16-bit like '180F' and expand to full 128-bit)
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function normalizeUuid(uuid: string): string {
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if (!uuid) return uuid;
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const u = uuid.toLowerCase();
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// already full form
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if (u.length === 36 && u.indexOf('-') > 0) return u;
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// allow forms like '180f' or '0x180f'
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const hex = u.replace(/^0x/, '').replace(/[^0-9a-f]/g, '');
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if (/^[0-9a-f]{4}$/.test(hex)) {
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return `0000${hex}-0000-1000-8000-00805f9b34fb`;
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}
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return uuid;
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}
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export class ServiceManager {
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private services = {};
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private characteristics = {};
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private characteristicCallbacks = {};
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private characteristicListeners = {};
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constructor() {
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}
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async discoverServices(deviceId: string, server: any): Promise<BleService[]> {
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// 获取设备的 GATT 服务器
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console.log(deviceId)
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// 由外部传入 server
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if (!server) throw new Error('设备未连接');
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const bleServices: BleService[] = [];
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if (!this.services[deviceId]) this.services[deviceId] = {};
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try {
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console.log('[ServiceManager] discoverServices called for', deviceId)
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console.log('[ServiceManager] server param:', server)
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let services = null;
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// Typical case: server is a BluetoothRemoteGATTServer and has getPrimaryServices
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if (server && typeof server.getPrimaryServices === 'function') {
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console.log('server.getPrimaryServices')
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services = await server.getPrimaryServices();
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}
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if (server && server.gatt && typeof server.gatt.getPrimaryServices === 'function') {
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// sometimes a BluetoothDevice object is passed instead of the server
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console.log('server.gatt.getPrimaryServices')
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services = await server.gatt.getPrimaryServices();
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}
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if (server && server.device && server.device.gatt && typeof server.device.gatt.getPrimaryServices === 'function') {
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console.log('server.device.gatt.getPrimaryServices')
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services = await server.device.gatt.getPrimaryServices();
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} else {
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console.log('other getPrimaryServices')
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// Last resort: if server is a wrapper with a connect method, try to ensure connected
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if (server && typeof server.connect === 'function') {
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console.log('[ServiceManager] attempting to connect via server.connect()')
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try {
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const s = await server.connect();
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if (s && typeof s.getPrimaryServices === 'function') services = await s.getPrimaryServices();
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} catch (e) {
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console.warn('[ServiceManager] server.connect() failed', e)
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}
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}
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}
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console.log('[ServiceManager] services resolved:', services)
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if (!services) throw new Error('无法解析 GATT services 对象 —— server 参数不包含 getPrimaryServices');
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for (let i = 0; i < services.length; i++) {
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const service = services[i];
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const rawUuid = service.uuid;
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const uuid = normalizeUuid(rawUuid);
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bleServices.push({ uuid, isPrimary: true });
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this.services[deviceId][uuid] = service;
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// ensure service UUID detection supports standard BLE services like Battery (0x180F)
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const lower = uuid.toLowerCase();
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const isBattery = lower === '0000180f-0000-1000-8000-00805f9b34fb';
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if (isBattery || isBaeService(uuid) || isBleService(uuid, BLE_SERVICE_PREFIXES)) {
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await this.getCharacteristics(deviceId, uuid);
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}
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}
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return bleServices;
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} catch (err) {
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console.error('[ServiceManager] discoverServices error:', err)
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throw err;
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}
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}
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async getCharacteristics(deviceId: string, serviceId: string): Promise<BleCharacteristic[]> {
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const service = this.services[deviceId]?.[serviceId];
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if (!service) throw new Error('服务未找到');
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const characteristics = await service.getCharacteristics();
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console.log(characteristics)
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const bleCharacteristics: BleCharacteristic[] = [];
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if (!this.characteristics[deviceId]) this.characteristics[deviceId] = {};
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if (!this.characteristics[deviceId][serviceId]) this.characteristics[deviceId][serviceId] = {};
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for (const characteristic of characteristics) {
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const properties = {
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read: characteristic.properties.read || false,
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write: characteristic.properties.write || characteristic.properties.writableAuxiliaries || characteristic.properties.reliableWrite || characteristic.properties.writeWithoutResponse || false,
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notify: characteristic.properties.notify || false,
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indicate: characteristic.properties.indicate || false
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};
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console.log(characteristic.properties)
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console.log(properties)
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// Construct a BleCharacteristic-shaped object including the required `service` property
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const bleCharObj = {
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uuid: characteristic.uuid,
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service: { uuid: serviceId, isPrimary: true },
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properties
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};
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bleCharacteristics.push(bleCharObj);
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// keep native characteristic reference for read/write/notify operations
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this.characteristics[deviceId][serviceId][characteristic.uuid] = characteristic;
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}
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return bleCharacteristics;
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}
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async writeCharacteristic(deviceId: string, serviceId: string, characteristicId: string, data: string | ArrayBuffer): Promise<void> {
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const characteristic = this.characteristics[deviceId]?.[serviceId]?.[characteristicId];
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if (!characteristic) throw new Error('特征值未找到');
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let buffer;
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if (typeof data === 'string') {
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buffer = new TextEncoder().encode(data).buffer;
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} else {
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buffer = data;
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}
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await characteristic.writeValue(buffer);
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}
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async subscribeCharacteristic(deviceId: string, serviceId: string, characteristicId: string, callback): Promise<void> {
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const characteristic = this.characteristics[deviceId]?.[serviceId]?.[characteristicId];
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if (!characteristic) throw new Error('特征值未找到');
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if (!characteristic.properties.notify && !characteristic.properties.indicate) {
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throw new Error('特征值不支持通知');
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}
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if (!this.characteristicCallbacks[deviceId]) this.characteristicCallbacks[deviceId] = {};
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if (!this.characteristicCallbacks[deviceId][serviceId]) this.characteristicCallbacks[deviceId][serviceId] = {};
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this.characteristicCallbacks[deviceId][serviceId][characteristicId] = callback;
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await characteristic.startNotifications();
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const listener = (event) => {
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const value = event.target.value;
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const data = new Uint8Array(value.buffer);
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const cb = this.characteristicCallbacks[deviceId][serviceId][characteristicId];
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if (cb) {
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cb({ deviceId, serviceId, characteristicId, data });
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}
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};
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// store listener so it can be removed later
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if (!this.characteristicListeners[deviceId]) this.characteristicListeners[deviceId] = {};
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if (!this.characteristicListeners[deviceId][serviceId]) this.characteristicListeners[deviceId][serviceId] = {};
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this.characteristicListeners[deviceId][serviceId][characteristicId] = { characteristic, listener };
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characteristic.addEventListener('characteristicvaluechanged', listener);
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}
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async unsubscribeCharacteristic(deviceId: string, serviceId: string, characteristicId: string): Promise<void> {
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const entry = this.characteristicListeners[deviceId]?.[serviceId]?.[characteristicId];
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if (!entry) return;
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try {
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const { characteristic, listener } = entry;
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characteristic.removeEventListener('characteristicvaluechanged', listener);
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await characteristic.stopNotifications();
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} catch (e) {
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// ignore
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}
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// cleanup
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delete this.characteristicListeners[deviceId][serviceId][characteristicId];
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delete this.characteristicCallbacks[deviceId][serviceId][characteristicId];
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}
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// Read a characteristic value and return ArrayBuffer
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async readCharacteristic(deviceId: string, serviceId: string, characteristicId: string): Promise<ArrayBuffer> {
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const characteristic = this.characteristics[deviceId]?.[serviceId]?.[characteristicId];
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if (!characteristic) throw new Error('特征值未找到');
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// Web Bluetooth returns a DataView from readValue()
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const value = await characteristic.readValue();
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if (!value) return new ArrayBuffer(0);
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// DataView.buffer is a shared ArrayBuffer; return a copy slice to be safe
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try {
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return value.buffer ? value.buffer.slice(0) : new Uint8Array(value).buffer;
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} catch (e) {
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// fallback
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const arr = new Uint8Array(value);
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return arr.buffer;
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}
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}
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}
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