Junhui Chen
665ccc6132
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269 lines
9.1 KiB
TypeScript
269 lines
9.1 KiB
TypeScript
import Constants from 'expo-constants';
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import * as SecureStore from 'expo-secure-store';
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import { TFunction } from 'i18next';
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import { Platform } from 'react-native';
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// 从环境变量或默认值中定义 WebSocket 端点
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export const WEBSOCKET_ENDPOINT = process.env.EXPO_PUBLIC_WEBSOCKET_ENDPOINT || Constants.expoConfig?.extra?.WEBSOCKET_ENDPOINT;
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export type WebSocketStatus = 'connecting' | 'connected' | 'disconnected' | 'reconnecting';
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type StatusListener = (status: WebSocketStatus) => void;
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// 消息监听器类型
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type MessageListener = (data: any) => void;
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// 根据后端 Rust 定义的 WsMessage 枚举创建 TypeScript 类型
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export type WsMessage =
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| { type: 'Chat', session_id: string, message: string, image_material_ids?: string[], video_material_ids?: string[] }
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| { type: 'ChatResponse', session_id: string, message: any, message_id?: string }
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| { type: 'ChatStream', session_id: string, chunk: string }
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| { type: 'ChatStreamEnd', session_id: string, message: any }
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| { type: 'Error', code: string, message: string }
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| { type: 'Ping' }
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| { type: 'Pong' }
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| { type: 'Connected', user_id: number };
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class WebSocketManager {
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private ws: WebSocket | null = null;
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private status: WebSocketStatus = 'disconnected';
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private messageListeners: Map<string, Set<(message: WsMessage) => void>> = new Map();
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private statusListeners: Set<StatusListener> = new Set();
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private reconnectAttempts = 0;
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private readonly maxReconnectAttempts = 1;
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private readonly reconnectInterval = 1000; // 初始重连间隔为1秒
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private pingIntervalId: ReturnType<typeof setInterval> | null = null;
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private readonly pingInterval = 30000; // 30秒发送一次心跳
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private isConnecting = false; // 防止并发重复连接
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private connectTimeoutId: ReturnType<typeof setTimeout> | null = null; // 连接超时
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constructor() {
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// 这是一个单例类，连接通过调用 connect() 方法来启动
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}
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/**
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* 获取当前 WebSocket 连接状态。
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*/
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public getStatus(): WebSocketStatus {
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return this.status;
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}
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/**
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* 启动 WebSocket 连接。
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* 会自动获取并使用存储的认证 token。
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*/
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public async connect() {
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// 已连或正在连，直接返回（基于状态的幂等）
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if (this.status === 'connected' || this.status === 'connecting' || this.isConnecting) {
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return;
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}
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this.isConnecting = true;
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this.setStatus('connecting');
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let token = "";
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try {
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if (Platform.OS === 'web') {
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token = localStorage.getItem('token') || "";
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} else {
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token = await SecureStore.getItemAsync('token') || "";
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}
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} catch (e) {
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console.error('WebSocket: 获取 token 失败:', e);
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}
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if (!token) {
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console.error('WebSocket: 未找到认证 token，无法连接。');
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this.isConnecting = false;
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this.setStatus('disconnected');
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return;
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}
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const url = `${WEBSOCKET_ENDPOINT}?token=${encodeURIComponent(token)}`;
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console.log('WebSocket: 开始连接到服务器');
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const ws = new WebSocket(url);
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this.ws = ws;
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// 连接超时（15s）
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if (this.connectTimeoutId) {
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clearTimeout(this.connectTimeoutId);
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this.connectTimeoutId = null;
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}
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this.connectTimeoutId = setTimeout(() => {
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if (this.ws === ws && ws.readyState !== WebSocket.OPEN) {
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try { ws.close(); } catch { /* noop */ }
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}
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}, 15000);
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ws.onopen = () => {
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if (this.connectTimeoutId) {
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clearTimeout(this.connectTimeoutId);
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this.connectTimeoutId = null;
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}
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console.log('WebSocket connected');
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this.setStatus('connected');
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this.reconnectAttempts = 0; // 重置重连尝试次数
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this.isConnecting = false;
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this.startPing();
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};
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ws.onmessage = (event) => {
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try {
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const message: WsMessage = JSON.parse(event.data);
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const eventListeners = this.messageListeners.get(message.type);
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if (eventListeners) {
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eventListeners.forEach(callback => callback(message));
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}
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} catch (error) {
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console.error('处理 WebSocket 消息失败:', error);
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}
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};
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ws.onerror = (error) => {
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if (this.connectTimeoutId) {
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clearTimeout(this.connectTimeoutId);
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this.connectTimeoutId = null;
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}
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console.error('WebSocket 发生错误:', error);
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this.stopPing();
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this.isConnecting = false;
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};
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ws.onclose = () => {
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if (this.connectTimeoutId) {
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clearTimeout(this.connectTimeoutId);
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this.connectTimeoutId = null;
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}
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console.log('WebSocket disconnected');
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this.ws = null;
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this.stopPing();
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this.isConnecting = false;
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// 只有在不是手动断开连接时才重连
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if (this.status !== 'disconnected') {
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this.setStatus('reconnecting');
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this.handleReconnect();
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}
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};
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}
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/**
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* 处理自动重连逻辑，使用指数退避策略。
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*/
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private handleReconnect() {
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if (this.reconnectAttempts < this.maxReconnectAttempts) {
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this.reconnectAttempts++;
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const delay = this.reconnectInterval * Math.pow(2, this.reconnectAttempts - 1);
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console.log(`${delay / 1000}秒后尝试重新连接 (第 ${this.reconnectAttempts} 次)...`);
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setTimeout(() => {
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this.connect();
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}, delay);
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} else {
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console.error('WebSocket 重连失败，已达到最大尝试次数。');
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this.setStatus('disconnected');
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}
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}
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/**
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* 发送消息到 WebSocket 服务器。
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* @param message 要发送的消息对象，必须包含 type 字段。
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*/
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public send(message: WsMessage) {
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if (!this.ws || this.ws.readyState !== WebSocket.OPEN) {
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console.error('WebSocket 未连接或未就绪，无法发送消息。');
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return;
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}
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this.ws.send(JSON.stringify(message));
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}
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/**
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* 订阅指定消息类型的消息。
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* @param type 消息类型，例如 'ChatResponse'。
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* @param callback 收到消息时的回调函数。
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*/
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public subscribe(type: WsMessage['type'], callback: (message: WsMessage) => void) {
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if (!this.messageListeners.has(type)) {
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this.messageListeners.set(type, new Set());
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}
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this.messageListeners.get(type)?.add(callback);
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}
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/**
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* 取消订阅指定消息类型的消息。
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* @param type 消息类型。
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* @param callback 要移除的回调函数。
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*/
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public unsubscribe(type: WsMessage['type'], callback: (message: WsMessage) => void) {
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const eventListeners = this.messageListeners.get(type);
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if (eventListeners) {
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eventListeners.delete(callback);
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if (eventListeners.size === 0) {
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this.messageListeners.delete(type);
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}
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}
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}
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/**
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* 手动断开 WebSocket 连接。
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*/
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public disconnect() {
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this.setStatus('disconnected');
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if (this.ws) {
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this.ws.close();
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}
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this.stopPing();
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}
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private setStatus(status: WebSocketStatus) {
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if (this.status !== status) {
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this.status = status;
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this.statusListeners.forEach(listener => listener(status));
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}
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}
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public subscribeStatus(listener: StatusListener) {
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this.statusListeners.add(listener);
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// Immediately invoke with current status
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listener(this.status);
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}
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public unsubscribeStatus(listener: StatusListener) {
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this.statusListeners.delete(listener);
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}
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/**
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* 启动心跳机制。
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*/
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private startPing() {
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this.stopPing(); // 先停止任何可能正在运行的计时器
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this.pingIntervalId = setInterval(() => {
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this.send({ type: 'Ping' });
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}, this.pingInterval);
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}
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/**
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* 停止心跳机制。
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*/
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private stopPing() {
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if (this.pingIntervalId) {
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clearInterval(this.pingIntervalId);
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this.pingIntervalId = null;
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}
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}
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}
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// 导出一个单例，确保整个应用共享同一个 WebSocket 连接
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export const webSocketManager = new WebSocketManager();
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// webscoket 错误映射
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export const getWebSocketErrorMessage = (key: string, t: TFunction) => {
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const messages = {
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'INSUFFICIENT_POINTS': t('ask:ask.insufficientPoints'),
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'INVALID_TOKEN': t('ask:ask.invalidToken'),
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'NOT_FOUND': t('ask:ask.notFound'),
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'PERMISSION_DENIED': t('ask:ask.permissionDenied'),
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'NOT_CONNECTED': t('ask:ask.notConnected'),
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};
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return messages[key as keyof typeof messages] || t('ask:ask.unknownError');
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}; |