feat: Complete frontend integration with native WebSocket and FastAPI backend
- Created websocket_client.js: Native WebSocket wrapper with Socket.IO-compatible interface - Automatic reconnection with exponential backoff - Room-based subscriptions for targeted updates - Message queueing during disconnection - Updated HTML templates (index.html, queue.html): - Replaced Socket.IO CDN with native websocket_client.js - No external dependencies needed - Updated JavaScript files (app.js, queue.js): - Added room subscriptions on WebSocket connect (scan_progress, download_progress, downloads) - Added dual event handlers for backward compatibility - Support both old (scan_completed) and new (scan_complete) message types - Support both old (download_error) and new (download_failed) message types - Support both old (queue_updated) and new (queue_status) message types - Registered anime router in fastapi_app.py: - Added anime_router import and registration - All API routers now properly included - Documentation: - Created FRONTEND_INTEGRATION.md with comprehensive integration guide - Updated infrastructure.md with frontend integration section - Updated instructions.md to mark task as completed - Testing: - Verified anime endpoint tests pass (pytest) - API endpoint mapping documented - WebSocket message format changes documented Benefits: - Native WebSocket API (faster, smaller footprint) - No external CDN dependencies - Full backward compatibility with existing code - Proper integration with backend services - Real-time updates via room-based messaging
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src/server/web/static/js/websocket_client.js
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233
src/server/web/static/js/websocket_client.js
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/**
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* Native WebSocket Client Wrapper
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* Provides Socket.IO-like interface using native WebSocket API
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*
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* This wrapper maintains compatibility with existing Socket.IO-style
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* event handlers while using the modern WebSocket API underneath.
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*/
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class WebSocketClient {
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constructor(url = null) {
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this.ws = null;
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this.url = url || this.getWebSocketUrl();
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this.eventHandlers = new Map();
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this.reconnectAttempts = 0;
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this.maxReconnectAttempts = 5;
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this.reconnectDelay = 1000;
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this.isConnected = false;
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this.rooms = new Set();
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this.messageQueue = [];
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this.autoReconnect = true;
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}
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/**
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* Get WebSocket URL based on current page URL
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*/
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getWebSocketUrl() {
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const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
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const host = window.location.host;
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return `${protocol}//${host}/ws/connect`;
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}
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/**
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* Connect to WebSocket server
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*/
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connect() {
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if (this.ws && this.ws.readyState === WebSocket.OPEN) {
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console.log('WebSocket already connected');
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return;
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}
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try {
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this.ws = new WebSocket(this.url);
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this.ws.onopen = () => {
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console.log('WebSocket connected');
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this.isConnected = true;
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this.reconnectAttempts = 0;
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// Emit connect event
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this.emit('connect');
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// Rejoin rooms
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this.rejoinRooms();
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// Process queued messages
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this.processMessageQueue();
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};
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this.ws.onmessage = (event) => {
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this.handleMessage(event.data);
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};
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this.ws.onerror = (error) => {
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console.error('WebSocket error:', error);
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this.emit('error', { error: 'WebSocket connection error' });
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};
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this.ws.onclose = (event) => {
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console.log('WebSocket disconnected', event.code, event.reason);
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this.isConnected = false;
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this.emit('disconnect', { code: event.code, reason: event.reason });
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// Attempt reconnection
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if (this.autoReconnect && this.reconnectAttempts < this.maxReconnectAttempts) {
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this.reconnectAttempts++;
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const delay = this.reconnectDelay * this.reconnectAttempts;
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console.log(`Attempting reconnection in ${delay}ms (attempt ${this.reconnectAttempts})`);
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setTimeout(() => this.connect(), delay);
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}
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};
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} catch (error) {
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console.error('Failed to create WebSocket connection:', error);
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this.emit('error', { error: 'Failed to connect' });
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}
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}
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/**
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* Disconnect from WebSocket server
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*/
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disconnect() {
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this.autoReconnect = false;
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if (this.ws) {
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this.ws.close(1000, 'Client disconnected');
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}
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}
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/**
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* Handle incoming WebSocket message
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*/
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handleMessage(data) {
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try {
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const message = JSON.parse(data);
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const { type, data: payload, timestamp } = message;
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// Emit event with payload
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if (type) {
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this.emit(type, payload || {});
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}
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} catch (error) {
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console.error('Failed to parse WebSocket message:', error, data);
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}
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}
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/**
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* Register event handler (Socket.IO-style)
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*/
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on(event, handler) {
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if (!this.eventHandlers.has(event)) {
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this.eventHandlers.set(event, []);
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}
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this.eventHandlers.get(event).push(handler);
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}
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/**
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* Remove event handler
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*/
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off(event, handler) {
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if (!this.eventHandlers.has(event)) {
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return;
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}
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const handlers = this.eventHandlers.get(event);
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const index = handlers.indexOf(handler);
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if (index !== -1) {
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handlers.splice(index, 1);
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}
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}
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/**
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* Emit event to registered handlers
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*/
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emit(event, data = null) {
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if (!this.eventHandlers.has(event)) {
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return;
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}
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const handlers = this.eventHandlers.get(event);
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handlers.forEach(handler => {
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try {
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if (data !== null) {
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handler(data);
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} else {
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handler();
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}
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} catch (error) {
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console.error(`Error in event handler for ${event}:`, error);
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}
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});
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}
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/**
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* Send message to server
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*/
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send(type, data = {}) {
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const message = JSON.stringify({
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type,
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data,
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timestamp: new Date().toISOString()
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});
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if (this.isConnected && this.ws.readyState === WebSocket.OPEN) {
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this.ws.send(message);
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} else {
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console.warn('WebSocket not connected, queueing message');
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this.messageQueue.push(message);
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}
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}
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/**
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* Join a room (subscribe to topic)
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*/
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join(room) {
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this.rooms.add(room);
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if (this.isConnected) {
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this.send('join', { room });
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}
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}
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/**
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* Leave a room (unsubscribe from topic)
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*/
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leave(room) {
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this.rooms.delete(room);
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if (this.isConnected) {
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this.send('leave', { room });
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}
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}
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/**
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* Rejoin all rooms after reconnection
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*/
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rejoinRooms() {
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this.rooms.forEach(room => {
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this.send('join', { room });
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});
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}
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/**
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* Process queued messages after connection
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*/
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processMessageQueue() {
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while (this.messageQueue.length > 0 && this.isConnected) {
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const message = this.messageQueue.shift();
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this.ws.send(message);
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}
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}
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/**
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* Check if connected
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*/
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connected() {
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return this.isConnected && this.ws && this.ws.readyState === WebSocket.OPEN;
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}
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}
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/**
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* Create global io() function for Socket.IO compatibility
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*/
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function io(url = null) {
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const client = new WebSocketClient(url);
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client.connect();
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return client;
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}
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