563 lines
14 KiB
JavaScript
563 lines
14 KiB
JavaScript
import { createEventBus } from './eventBus'
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import { createBleState, BLE_STAGE } from './state'
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import { createBleError, getBleErrorText, normalizeBleError } from './errors'
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import { uint8ArrayToArrayBuffer, toUint8Array } from '../utils/bytes'
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import { toFullUuid, uuidEquals, uuidInList } from '../utils/uuid'
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import { runWithRetry } from './retry'
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import { getBleProfile, DEVICE_PROFILE } from '../protocols/profiles'
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// 把 uni 的 success/fail 回调风格统一成 Promise，便于串联 async 流程。
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function promisifyUniApi(apiName, params = {}) {
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return new Promise((resolve, reject) => {
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uni[apiName]({
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...params,
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success: (res) => resolve(res),
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fail: (err) => reject(err)
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})
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})
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}
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/**
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* BLE 核心能力封装：
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* 负责适配器生命周期、扫描、连接、服务/特征发现、读写与通知监听。
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*/
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export function createBleCore(options = {}) {
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const {
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reconnect = {
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enabled: true,
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retries: 2,
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delay: 1200
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},
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logger = console,
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profileId = DEVICE_PROFILE.UNKNOWN
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} = options
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const eventBus = createEventBus()
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const state = createBleState()
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let currentProfile = getBleProfile(profileId)
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let deviceFoundHandler = null
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let adapterStateHandler = null
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let connectionStateHandler = null
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let characteristicValueHandler = null
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// 返回状态快照，避免调用方直接改写内部状态对象。
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function snapshotState() {
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return {
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...state,
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auth: { ...state.auth },
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deviceMap: { ...state.deviceMap },
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characteristics: { ...state.characteristics }
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}
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}
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// 统一 patch 状态并广播 state:change，保证 UI 状态来源单一。
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function patchState(partialState) {
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Object.assign(state, partialState)
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eventBus.emit('state:change', snapshotState())
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}
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function setStage(stage) {
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patchState({ stage })
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}
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function setProfile(nextProfileId) {
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currentProfile = getBleProfile(nextProfileId)
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patchState({ profileId: currentProfile.id })
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}
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function getProfile() {
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return currentProfile
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}
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function setAuthState(partialAuth = {}) {
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patchState({
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auth: {
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...state.auth,
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...partialAuth
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}
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})
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}
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function emit(eventName, payload) {
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eventBus.emit(eventName, payload)
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}
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function emitError(error) {
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const normalized = normalizeBleError(error)
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patchState({ lastError: normalized })
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eventBus.emit('error', normalized)
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return normalized
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}
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async function openAdapter() {
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try {
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await promisifyUniApi('openBluetoothAdapter')
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patchState({ available: true })
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setStage(BLE_STAGE.ADAPTER_OPENED)
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return true
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} catch (error) {
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throw emitError(error)
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}
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}
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async function closeAdapter() {
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try {
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await promisifyUniApi('closeBluetoothAdapter')
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} catch (error) {
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logger.warn('[BLE] close adapter failed', error)
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}
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patchState({
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stage: BLE_STAGE.IDLE,
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available: false,
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discovering: false,
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connected: false,
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deviceId: '',
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serviceId: '',
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characteristics: {}
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})
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}
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async function getAdapterState() {
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try {
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const result = await promisifyUniApi('getBluetoothAdapterState')
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patchState({
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available: Boolean(result.available),
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discovering: Boolean(result.discovering)
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})
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return result
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} catch (error) {
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throw emitError(error)
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}
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}
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function watchAdapterState() {
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if (adapterStateHandler) {
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return
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}
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adapterStateHandler = (result) => {
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patchState({
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available: Boolean(result.available),
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discovering: Boolean(result.discovering)
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})
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eventBus.emit('adapter:state', result)
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if (!result.available) {
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setStage(BLE_STAGE.DISCONNECTED)
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}
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}
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uni.onBluetoothAdapterStateChange(adapterStateHandler)
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}
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function unwatchAdapterState() {
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if (!adapterStateHandler) {
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return
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}
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if (uni.offBluetoothAdapterStateChange) {
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uni.offBluetoothAdapterStateChange(adapterStateHandler)
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}
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adapterStateHandler = null
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}
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/**
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* 启动设备扫描。
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* services 传入时会做 UUID 标准化，用于只扫描目标服务设备。
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*/
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async function startDiscovery(params = {}) {
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const {
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services = [],
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allowDuplicatesKey = true,
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interval = 0,
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powerLevel = 'high'
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} = params
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try {
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if (!state.available) {
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await openAdapter()
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}
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const options = {
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allowDuplicatesKey,
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interval
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}
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if (services.length) {
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options.services = services.map((uuid) => toFullUuid(uuid) || uuid)
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}
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if (powerLevel) {
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options.powerLevel = powerLevel
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}
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await promisifyUniApi('startBluetoothDevicesDiscovery', options)
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patchState({ discovering: true, deviceMap: {} })
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setStage(BLE_STAGE.DISCOVERING)
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return true
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} catch (error) {
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throw emitError(error)
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}
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}
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async function stopDiscovery() {
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try {
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await promisifyUniApi('stopBluetoothDevicesDiscovery')
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} catch (error) {
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logger.warn('[BLE] stop discovery failed', error)
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}
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patchState({ discovering: false })
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}
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function watchDeviceFound() {
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if (deviceFoundHandler) {
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return
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}
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deviceFoundHandler = (result) => {
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const list = Array.isArray(result.devices) ? result.devices : [result]
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const nextMap = { ...state.deviceMap }
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// 基于 deviceId 做去重与增量更新，避免列表无限叠加。
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list.forEach((device) => {
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if (!device || !device.deviceId) {
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return
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}
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const previous = nextMap[device.deviceId] || {}
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nextMap[device.deviceId] = {
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...previous,
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...device,
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showName: device.name || device.localName || previous.showName || '未命名设备'
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}
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})
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patchState({ deviceMap: nextMap })
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eventBus.emit('device:found', Object.values(nextMap))
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}
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uni.onBluetoothDeviceFound(deviceFoundHandler)
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}
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function unwatchDeviceFound() {
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if (!deviceFoundHandler) {
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return
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}
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if (uni.offBluetoothDeviceFound) {
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uni.offBluetoothDeviceFound(deviceFoundHandler)
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}
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deviceFoundHandler = null
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}
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async function connect(deviceId, options = {}) {
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if (!deviceId) {
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throw emitError(createBleError(10013, 'deviceId 不能为空'))
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}
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const {
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timeout = 15000,
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autoReconnect = reconnect.enabled
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} = options
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const runConnect = async () => {
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setStage(BLE_STAGE.CONNECTING)
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await promisifyUniApi('createBLEConnection', { deviceId, timeout })
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patchState({ connected: true, deviceId })
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setStage(BLE_STAGE.CONNECTED)
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return true
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}
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try {
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if (!autoReconnect) {
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return await runConnect()
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}
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return await runWithRetry(runConnect, {
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retries: reconnect.retries,
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delay: reconnect.delay,
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shouldRetry: (error) => {
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const normalized = normalizeBleError(error)
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return [10003, 10006, 10012].includes(normalized.code)
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}
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})
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} catch (error) {
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throw emitError(error)
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}
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}
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async function disconnect(deviceId = state.deviceId) {
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if (!deviceId) {
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return
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}
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try {
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await promisifyUniApi('closeBLEConnection', { deviceId })
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} catch (error) {
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logger.warn('[BLE] close connection failed', error)
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}
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patchState({ connected: false, deviceId: '', serviceId: '', characteristics: {} })
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setStage(BLE_STAGE.DISCONNECTED)
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}
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function watchConnectionChange() {
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if (connectionStateHandler) {
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return
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}
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connectionStateHandler = (result) => {
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if (state.deviceId && result.deviceId !== state.deviceId) {
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return
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}
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patchState({ connected: Boolean(result.connected) })
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eventBus.emit('connection:change', result)
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if (!result.connected) {
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setStage(BLE_STAGE.DISCONNECTED)
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}
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}
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uni.onBLEConnectionStateChange(connectionStateHandler)
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}
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function unwatchConnectionChange() {
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if (!connectionStateHandler) {
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return
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}
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if (uni.offBLEConnectionStateChange) {
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uni.offBLEConnectionStateChange(connectionStateHandler)
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}
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connectionStateHandler = null
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}
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function getServiceCandidates() {
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const profileService = currentProfile?.uuids?.service
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const candidates = [
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profileService,
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toFullUuid('00F4'),
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toFullUuid('F400'),
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toFullUuid('FFF4')
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]
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return candidates.filter(Boolean)
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}
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/**
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* 发现并锁定目标服务。
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* 文档主服务为 0x00F4，同时兼容部分固件 0xF400 / 0xFFF4。
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*/
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async function discoverServices(deviceId = state.deviceId) {
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if (!deviceId) {
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throw emitError(createBleError(10013, 'discoverServices 缺少 deviceId'))
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}
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try {
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const result = await promisifyUniApi('getBLEDeviceServices', { deviceId })
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const services = result.services || []
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const candidates = getServiceCandidates()
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const targetService = services.find((service) => candidates.some((uuid) => uuidEquals(service.uuid, uuid)))
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if (!targetService) {
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throw createBleError(10004, '设备未暴露目标服务(00F4/F400/FFF4)')
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}
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patchState({ serviceId: targetService.uuid })
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setStage(BLE_STAGE.SERVICE_DISCOVERED)
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return {
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services,
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targetService
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}
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} catch (error) {
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throw emitError(error)
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}
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}
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async function discoverCharacteristics(options = {}) {
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const deviceId = options.deviceId || state.deviceId
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const serviceId = options.serviceId || state.serviceId
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if (!deviceId || !serviceId) {
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throw emitError(createBleError(10013, 'discoverCharacteristics 缺少 deviceId/serviceId'))
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}
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try {
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const result = await promisifyUniApi('getBLEDeviceCharacteristics', { deviceId, serviceId })
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const list = result.characteristics || []
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const profile = getProfile()
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// 缓存业务侧常用特征，减少后续每次操作时的查找成本。
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const characteristicMap = {
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wifi: list.find((item) => uuidEquals(item.uuid, profile.uuids.wifi)) || null,
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key: list.find((item) => uuidEquals(item.uuid, profile.uuids.key)) || null,
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cmd: list.find((item) => uuidEquals(item.uuid, profile.uuids.cmd)) || null,
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msg: list.find((item) => uuidEquals(item.uuid, profile.uuids.msg)) || null,
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state: list.find((item) => uuidEquals(item.uuid, profile.uuids.state)) || null,
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radar: list.find((item) => uuidEquals(item.uuid, profile.uuids.radar)) || null,
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all: list
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}
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patchState({ characteristics: characteristicMap })
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return characteristicMap
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} catch (error) {
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throw emitError(error)
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}
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}
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async function readCharacteristic(characteristicId, options = {}) {
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const deviceId = options.deviceId || state.deviceId
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const serviceId = options.serviceId || state.serviceId
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if (!deviceId || !serviceId || !characteristicId) {
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throw emitError(createBleError(10013, 'readCharacteristic 参数缺失'))
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}
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try {
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await promisifyUniApi('readBLECharacteristicValue', {
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deviceId,
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serviceId,
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characteristicId
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})
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return true
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} catch (error) {
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throw emitError(error)
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}
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}
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async function writeCharacteristic(characteristicId, value, options = {}) {
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const deviceId = options.deviceId || state.deviceId
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const serviceId = options.serviceId || state.serviceId
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if (!deviceId || !serviceId || !characteristicId) {
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throw emitError(createBleError(10013, 'writeCharacteristic 参数缺失'))
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}
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try {
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await promisifyUniApi('writeBLECharacteristicValue', {
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deviceId,
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serviceId,
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characteristicId,
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value: uint8ArrayToArrayBuffer(toUint8Array(value))
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})
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return true
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} catch (error) {
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throw emitError(error)
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}
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}
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async function notifyCharacteristic(characteristicId, stateFlag = true, options = {}) {
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const deviceId = options.deviceId || state.deviceId
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const serviceId = options.serviceId || state.serviceId
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if (!deviceId || !serviceId || !characteristicId) {
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throw emitError(createBleError(10013, 'notifyCharacteristic 参数缺失'))
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}
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try {
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await promisifyUniApi('notifyBLECharacteristicValueChange', {
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deviceId,
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serviceId,
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characteristicId,
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state: Boolean(stateFlag)
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})
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return true
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} catch (error) {
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throw emitError(error)
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}
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}
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function watchCharacteristicValue() {
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if (characteristicValueHandler) {
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return
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}
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// 统一转为 Uint8Array，简化上层解析逻辑。
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characteristicValueHandler = (result) => {
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eventBus.emit('characteristic:value', {
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...result,
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value: toUint8Array(result.value)
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})
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}
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uni.onBLECharacteristicValueChange(characteristicValueHandler)
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}
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function unwatchCharacteristicValue() {
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if (!characteristicValueHandler) {
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return
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}
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if (uni.offBLECharacteristicValueChange) {
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uni.offBLECharacteristicValueChange(characteristicValueHandler)
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}
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characteristicValueHandler = null
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}
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function listDiscoveredDevices() {
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return Object.values(state.deviceMap)
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}
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function pickDeviceByService(serviceUuid = currentProfile.uuids.service) {
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const list = listDiscoveredDevices()
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return list.find((device) => uuidInList(serviceUuid, device.advertisServiceUUIDs || [])) || null
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}
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async function cleanup() {
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// 清理顺序：先停扫描与连接，再移除监听，最后关闭适配器。
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await stopDiscovery()
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await disconnect()
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unwatchDeviceFound()
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unwatchAdapterState()
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unwatchConnectionChange()
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unwatchCharacteristicValue()
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await closeAdapter()
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eventBus.clear()
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}
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return {
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openAdapter,
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closeAdapter,
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getAdapterState,
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watchAdapterState,
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unwatchAdapterState,
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startDiscovery,
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stopDiscovery,
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watchDeviceFound,
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unwatchDeviceFound,
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connect,
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disconnect,
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watchConnectionChange,
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unwatchConnectionChange,
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discoverServices,
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discoverCharacteristics,
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readCharacteristic,
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writeCharacteristic,
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notifyCharacteristic,
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watchCharacteristicValue,
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unwatchCharacteristicValue,
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pickDeviceByService,
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listDiscoveredDevices,
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getState: snapshotState,
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setStage,
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setProfile,
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getProfile,
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setAuthState,
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emit,
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on: eventBus.on,
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once: eventBus.once,
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cleanup,
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getBleErrorText
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}
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}
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