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const path = require('path'); const http = require('http'); const WebSocket = require('ws'); const { Pool } = require('pg'); const allFoods = require('./src/data/food.json').categories.flatMap(c => c.foods); // Constants for game modes and their configurations const MODE_CONFIG = { Easy: { fruitSpeed: 100, allowPenalty: false, allowEffect: false, }, Medium: { fruitSpeed: 125, allowPenalty: true, allowEffect: true, }, Hard: { fruitSpeed: 150, allowPenalty: true, allowEffect: true, }, }; const server = http.createServer(); const wss = new WebSocket.Server({ noServer: true }); const sessions = {}; const reconnectionTimers = {}; const sessionFilePath = path.resolve(__dirname, './src/data/sessionID.json'); const scoresBySession = {}; const fruitQueues = {}; const fruitIntervals = {}; const TARGET_FOOD_WEIGHT = 16; // Weight for the target food in the queue const sessionGameModes = {}; let foodInstanceCounter = 0 const activeFoods = {}; const lastSpawnAt = {}; const QUEUE_MAX = 10; // Reject connections from unauthorized origins const allowedOrigins = [ 'http://localhost:3000', 'http://localhost:3001', 'http://localhost:3002', 'http://localhost:3003', 'http://localhost:3004', 'http://localhost:3005', 'https://project-acc-hungry-hippos.vercel.app' ]; server.on('upgrade', (request, socket, head) => { const origin = request.headers.origin; if (!allowedOrigins.includes(origin)) { console.log(`[WSS] Connection from unauthorized origin ${origin} rejected.`); socket.write('HTTP/1.1 401 Unauthorized\r\n\r\n'); socket.destroy(); return; } wss.handleUpgrade(request, socket, head, (ws) => { console.log(`[WSS] Connection from ${origin} accepted.`); wss.emit('connection', ws, request); }); }); const IS_PROD = process.env.NODE_ENV === 'production'; let pool; if (IS_PROD) { pool = new Pool({ connectionString: process.env.DATABASE_URL, ssl: { rejectUnauthorized: false } }); } // Runs once to set up the database and tables const setupDatabase = async () => { if (!IS_PROD) return; const client = await pool.connect(); try { // Check if the tables exist, if not create them await client.query(` CREATE TABLE IF NOT EXISTS sessions ( session_id VARCHAR(5) PRIMARY KEY, created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP ); `); // Create a players table to store users in each session await client.query(` CREATE TABLE IF NOT EXISTS players ( id SERIAL PRIMARY KEY, user_id VARCHAR(255) NOT NULL, session_id VARCHAR(5) NOT NULL REFERENCES sessions(session_id) ON DELETE CASCADE, role VARCHAR(25), UNIQUE(session_id, user_id) ); `); // Create a table to store session data await client.query(` CREATE TABLE IF NOT EXISTS game_statistics ( id INT PRIMARY KEY DEFAULT 1, total_sessions_played INT DEFAULT 0, total_hippo_players INT DEFAULT 0, total_aac_users INT DEFAULT 0, hippo_color_counts JSONB DEFAULT '{}'::jsonb, mode_counts JSONB DEFAULT '{}'::jsonb, total_correct_eats INT DEFAULT 0, total_wrong_eats INT DEFAULT 0, aac_food_counts JSONB DEFAULT '{}'::jsonb, aac_verb_counts JSONB DEFAULT '{}'::jsonb, last_updated TIMESTAMPTZ ); `); await client.query(` INSERT INTO game_statistics (id) VALUES (1) ON CONFLICT (id) DO NOTHING; `); console.log('Database setup complete'); } catch (err) { console.error('Error setting up database:', err); } finally { client.release(); } } // Function to get a weighted random food item from the list // This function will give more weight to the target food, making it more likely to be selected function getWeightedRandomFood(allFoods, targetId) { if (!allFoods || allFoods.length === 0) { console.error('Food list is empty or undefined'); return null; } const weightedList = []; for (const food of allFoods) { const weight = food.id === targetId ? TARGET_FOOD_WEIGHT : 1; for (let i = 0; i < weight; i++) { weightedList.push(food); } } return weightedList[Math.floor(Math.random() * weightedList.length)]; } // Websocket Server wss.on('connection', (ws) => { console.log('WSS Client connected'); ws.on('message', async (message) => { try { const data = JSON.parse(message); // console.log('WSS Received:', data); // Validate session request if (data.type === 'VALIDATE_SESSION') { const { gameCode } = data.payload; let isValid = false; let sessionsData = { sessions: {} }; if (!IS_PROD) { // If local development, read from the session file try { if (fs.existsSync(sessionFilePath)) { sessionsData = JSON.parse(fs.readFileSync(sessionFilePath, 'utf-8')); } } catch (e) { console.error('Error reading session file:', e); } isValid = Object.hasOwn(sessionsData.sessions, gameCode); } else { // If in production, check the database try { const result = await pool.query('SELECT EXISTS (SELECT 1 FROM sessions WHERE session_id = $1)', [gameCode]); isValid = result.rows[0].exists; } catch (err) { console.error('Error validating session:', err); } } ws.send(JSON.stringify({ type: 'SESSION_VALIDATED', payload: { isValid, gameCode } })); } // Handle session creation request if (data.type === 'CREATE_SESSION') { // If local development, skip database operations let sessionId; if (!IS_PROD) { let sessionsData = { sessions: {} }; try { if (fs.existsSync(sessionFilePath)) { sessionsData = JSON.parse(fs.readFileSync(sessionFilePath, 'utf-8')); } } catch (e) { console.error('Error reading session file:', e); } sessionId = generateUniqueSessionId(Object.keys(sessionsData.sessions)); sessionsData.sessions[sessionId] = []; fs.writeFileSync(sessionFilePath, JSON.stringify(sessionsData, null, 2), 'utf-8'); } else { // If in production, insert into the database while (true) { sessionId = generateSessionId(); try { await pool.query('INSERT INTO sessions (session_id) VALUES ($1)', [sessionId]); await pool.query('UPDATE game_statistics SET total_sessions_played = total_sessions_played + 1, last_updated = NOW() WHERE id = 1'); break; } catch (err) { console.error('Error creating session:', err); } } } ws.send(JSON.stringify({ type: 'SESSION_CREATED', payload: { sessionId } })); sessions[sessionId] = new Set(); sessions[sessionId].statsLogged = false; } if (data.type === 'PLAYER_MOVE') { const { sessionId, userId, x, y } = data.payload; broadcast(sessionId, { type: 'PLAYER_MOVE_BROADCAST', payload: { userId, x, y } }); } // When a player joins, store their WebSocket connection in the correct session room if (data.type === 'PLAYER_JOIN') { const { sessionId, userId, role, color } = data.payload; ws.sessionId = sessionId; ws.userId = userId; ws.role = role; ws.color = color; if (!sessions[sessionId]) { sendError(ws, { code: 'SESSION_NOT_FOUND', message: `Session ${sessionId} not found`, sessionId, }); return; } sessions[sessionId].add(ws); console.log(`WSS User ${userId} joined session ${sessionId}. Total clients in session: ${sessions[sessionId].size}`); if (!scoresBySession[sessionId]) scoresBySession[sessionId] = {}; if (role === 'Hippo Player' && !scoresBySession[sessionId][userId]) { scoresBySession[sessionId][userId] = 0; } if (IS_PROD) { // If in production, insert the player into the database try { await pool.query(` INSERT INTO players (session_id, user_id, role) VALUES ($1, $2, $3) ON CONFLICT (session_id, user_id) DO UPDATE SET role = EXCLUDED.role`, [sessionId, userId, role]); } catch (err) { console.error('Error adding player to database:', err); } } // Broadcast to all clients in that session that a new player has joined broadcast(sessionId, { type: 'PLAYER_JOINED_BROADCAST', payload: { userId, role, color } }); // Collect all users in the session const usersInSession = Array.from(sessions[sessionId]) .filter(client => client.readyState === WebSocket.OPEN) .map(client => ({ userId: client.userId, role: client.role, color: client.color })); // Send full user list broadcast(sessionId, { type: 'USERS_LIST_UPDATE', payload: { users: usersInSession } }); console.log(`[WSS] Broadcasting USERS_LIST_UPDATE to ${sessionId}:`, usersInSession); // Broadcast initial leaderboard with everyone at score 0 broadcast(sessionId, { type: 'SCORE_UPDATE_BROADCAST', payload: { scores: scoresBySession[sessionId] } }); } // When the presenter clicks "Start Game", broadcast to all clients in the session // to signal that the game has begun. Clients will navigate to the game screen. if (data.type === 'START_GAME') { const { sessionId, mode } = data.payload; console.log(`[WSS] Start game received for session ${sessionId} with mode ${mode}`); if (IS_PROD && sessions[sessionId]) { if (!sessions[sessionId].statsLogged) { try { await pool.query( "DELETE FROM players WHERE session_id = $1 AND role = 'Presenter'", [sessionId] ); await pool.query( `UPDATE game_statistics SET mode_counts = jsonb_set( mode_counts, '{${mode}}', (COALESCE(mode_counts->>'${mode}', '0')::int + 1)::text::jsonb ) WHERE id = 1` ); let hippoCount = 0; let aacCount = 0; for (const client of sessions[sessionId]) { if (client.role === 'Hippo Player') { hippoCount++; } else if (client.role === 'AAC User') { aacCount++; } } if (hippoCount > 0 || aacCount > 0) { await pool.query( `UPDATE game_statistics SET total_hippo_players = total_hippo_players + $1, total_aac_users = total_aac_users + $2, last_updated = NOW() WHERE id = 1`, [hippoCount, aacCount] ); } sessions[sessionId].statsLogged = true; } catch (err) { console.error('[WSS] Error cleaning up presenter role:', err); } } } if (sessions[sessionId]) { sessions[sessionId].gameStarted = true; } // Store mode and reset per-session state sessionGameModes[sessionId] = mode; activeFoods[sessionId] = []; // Seed queue with objects if (!fruitQueues[sessionId]) { // const allFoods = require('./src/data/food.json').categories.flatMap(c => c.foods); // fruitQueues[sessionId] = []; // for (let i = 0; i < 10; i++) { // const food = allFoods[Math.floor(Math.random() * allFoods.length)]; // fruitQueues[sessionId].push(food); // if (fruitQueues[sessionId].length > QUEUE_MAX) { // fruitQueues[sessionId] = fruitQueues[sessionId].slice(0, QUEUE_MAX); // } // } clearFruitQueue(sessionId); for (let i = 0; i < QUEUE_MAX; i++) { const food = allFoods[Math.floor(Math.random() * allFoods.length)]; enqueueFruit(sessionId, food); } } // Target tracking sessions[sessionId].initialTargetSent = false; sessions[sessionId].currentTargetFoodId = null; const SCREEN_WIDTH = 1024; const SCREEN_HEIGHT = 1024; // spawn mark (first spawn after 3s) lastSpawnAt[sessionId] = Date.now(); // 50ms game loop; spawns happen every 3000ms const TICK_INTERVAL = 50; fruitIntervals[sessionId] = setInterval(() => { if (!sessions[sessionId]) { clearInterval(fruitIntervals[sessionId]); delete fruitIntervals[sessionId]; return; } //const allFoods = require('./src/data/food.json').categories.flatMap(c => c.foods); const gameMode = sessionGameModes[sessionId] || 'Easy'; const speed = MODE_CONFIG[gameMode].fruitSpeed; // spawn every 3s const now = Date.now(); if (now - lastSpawnAt[sessionId] >= 3000) { lastSpawnAt[sessionId] = now; if (fruitQueues[sessionId] && fruitQueues[sessionId].length > 0) { const dequeued = fruitQueues[sessionId].shift(); const nextFoodId = typeof dequeued === 'string' ? dequeued : dequeued.id; const targetFood = allFoods.find(f => f.id === nextFoodId); if (nextFoodId && targetFood) { if (!sessions[sessionId].initialTargetSent) { sessions[sessionId].currentTargetFoodId = nextFoodId; sessions[sessionId].initialTargetSent = true; broadcast(sessionId, { type: 'AAC_TARGET_FOOD', payload: { targetFoodId: nextFoodId, targetFoodData: targetFood, effect: null }, }); } const weightedFood = getWeightedRandomFood(allFoods, sessions[sessionId].currentTargetFoodId); // fruitQueues[sessionId].push(weightedFood); // keep objects // if (fruitQueues[sessionId].length > QUEUE_MAX) { // fruitQueues[sessionId] = fruitQueues[sessionId].slice(0, QUEUE_MAX); // } enqueueFruit(sessionId, weightedFood); foodInstanceCounter++; const instanceId = `food-${foodInstanceCounter}`; const hippoClients = [...sessions[sessionId]].filter(c => c.role === 'Hippo Player'); hippoClients.forEach(client => { // Assign a random angle based on the edge they selected // Each hippo will spawn from their selected edge const edge = client.edge || 'bottom'; const angleRange = getAngleRangeForEdge(edge); const angle = Math.random() * (angleRange.max - angleRange.min) + angleRange.min; const vx = (Math.cos(angle) * speed) / SCREEN_WIDTH; const vy = (Math.sin(angle) * speed) / SCREEN_HEIGHT; activeFoods[sessionId].push({ instanceId: `${instanceId}-${client.userId}`, foodId: nextFoodId, x: 0.5, y: 0.5, vx, vy, effect: (nextFoodId === sessions[sessionId].currentTargetFoodId) ? sessions[sessionId].currentTargetEffect : null, }); }); // Broadcast the new food state to all clients in the session broadcast(sessionId, { type: 'FOOD_STATE_UPDATE', payload: { foods: activeFoods[sessionId] } }); //console.log('[WSS] Spawned', nextFoodId, 'queueLen=', fruitQueues[sessionId].length); } else { console.warn('[WSS] Unknown food in queue, skipping spawn:', dequeued); } } } // physics tick @ 50ms const timeStep = TICK_INTERVAL / 1000; // convert to seconds activeFoods[sessionId].forEach(food => { food.x += food.vx * timeStep; food.y += food.vy * timeStep; }); // broadcast motion broadcast(sessionId, { type: 'FOOD_STATE_UPDATE', payload: { foods: activeFoods[sessionId] } }); // cull off-screen const BOUNDARY_BUFFER = 100; activeFoods[sessionId] = activeFoods[sessionId].filter(food => food.x > -BOUNDARY_BUFFER && food.x < 1024 + BOUNDARY_BUFFER && food.y > -BOUNDARY_BUFFER && food.y < 1024 + BOUNDARY_BUFFER ); }, TICK_INTERVAL); broadcast(sessionId, { type: 'START_GAME_BROADCAST', payload: { sessionId, mode }, }); } if (data.type === 'START_TIMER') { const { sessionId } = data.payload; //console.log(`[WSS] Starting timer for session ${sessionId}`); let secondsLeft = 180; //console.log('[WSS] SECONDSLEFT INIT:', secondsLeft); const interval = setInterval(() => { if (secondsLeft <= 0) { //console.log(`[WSS] Timer ended for session ${sessionId}`); broadcast(sessionId, { type: 'TIMER_UPDATE', secondsLeft: 0 }); broadcast(sessionId, { type: 'GAME_OVER' }); clearInterval(fruitIntervals[sessionId]); cleanupSession(sessionId); delete fruitIntervals[sessionId]; delete fruitQueues[sessionId]; clearInterval(interval); } else { broadcast(sessionId, { type: 'TIMER_UPDATE', secondsLeft }); secondsLeft--; } }, 1000); } if (data.type === 'SET_EDGE') { const { sessionId, userId, edge } = data.payload; for (const client of sessions[sessionId]) { if (client.userId === userId) { client.edge = edge; //console.log(`[WSS] Stored edge "${edge}" for user ${userId}`); break; } } const assignedEdges = [...sessions[sessionId]].map(c => `${c.userId}: ${c.edge}`); // console.log(`[WSS DEBUG] Current edge map for session ${sessionId}:`, assignedEdges); } // When an AAC user selects a food, broadcast it to the session if (data.type === 'AAC_FOOD_SELECTED') { const { sessionId, food, effect } = data.payload; //console.log(`WSS Food selected in session ${sessionId}:`, food, effect); const gameMode = sessionGameModes[sessionId] || 'Easy'; const finalEffect = MODE_CONFIG[gameMode].allowEffect ? effect : null; if (IS_PROD) { await pool.query( `UPDATE game_statistics SET aac_food_counts = jsonb_set( aac_food_counts, '{${food.id}}', (COALESCE(aac_food_counts->>'${food.id}', '0')::int + 1)::text::jsonb ) WHERE id = 1` ); if (finalEffect) { await pool.query( `UPDATE game_statistics SET aac_verb_counts = jsonb_set( aac_verb_counts, '{${finalEffect.id}}', (COALESCE(aac_verb_counts->>'${finalEffect.id}', '0')::int + 1)::text::jsonb ) WHERE id = 1` ); } } if (fruitQueues[sessionId]) { // Pushes AAC-selected food to the front of the queue // Keep queue entries as full objects, not ids const head = fruitQueues[sessionId][0]; const headId = head && (head.id || head); // tolerate any stray ids if (headId !== food.id) { // fruitQueues[sessionId].unshift(food); // if (fruitQueues[sessionId].length > QUEUE_MAX) { // fruitQueues[sessionId] = fruitQueues[sessionId].slice(0, QUEUE_MAX); // } enqueueFruit(sessionId, food, { front: true }); } } // Updates the session's current weighted target sessions[sessionId].currentTargetFoodId = food.id; sessions[sessionId].currentTargetEffect = finalEffect; // Broadcasts the selected food as the official target broadcast(sessionId, { type: 'AAC_TARGET_FOOD', payload: { targetFoodId: food.id, targetFoodData: food, effect: finalEffect } }); } // When a player eats a target food with an effect, broadcast it to the session if (data.type === 'PLAYER_EFFECT_APPLIED') { const { sessionId, targetUserId, effect } = data.payload; broadcast(sessionId, { type: 'PLAYER_EFFECT_BROADCAST', payload: { targetUserId, effect } }); } // Defines angle ranges in radians function getAngleRangeForEdge(edge) { switch (edge) { case 'top': return { min: -Math.PI * 3/4, max: -Math.PI / 4 }; // Up: -135° to -45° case 'bottom': return { min: Math.PI / 4, max: Math.PI * 3/4 }; // Down: +45° to +135° case 'left': return { min: Math.PI * 7/8, max: Math.PI * 9/8 }; // Left: 157.5° to 202.5° case 'right': return { min: -Math.PI / 4, max: Math.PI / 4 }; // Right: -45° to +45° default: return { min: 0, max: 2 * Math.PI }; } } // Notify all players in the session to remove the fruit if (data.type === 'FRUIT_EATEN') { const { sessionId, instanceId } = data.payload; if (activeFoods[sessionId]) { activeFoods[sessionId] = activeFoods[sessionId].filter(f => f.instanceId !== instanceId); } broadcast(sessionId, { type: 'REMOVE_FOOD', payload: { instanceId } }); } // Broadcast updated scores if (data.type === 'FRUIT_EATEN_BY_PLAYER') { const { sessionId, userId, isCorrect, allowPenalty, effect } = data.payload; if (!scoresBySession[sessionId]) scoresBySession[sessionId] = {}; const prev = scoresBySession[sessionId][userId] || 0; if (isCorrect) { sessions[sessionId].currentTargetEffect = null; if (effect === 'burn') { scoresBySession[sessionId][userId] = Math.max(0, prev - 2); //console.log(`[WSS] Player ${userId} burned, score reduced by 2 from ${prev} to ${scoresBySession[sessionId][userId]}`); } else if (effect === 'grow') { scoresBySession[sessionId][userId] = prev + 2; // console.log(`[WSS] Player ${userId} grew, score increased by 2 from ${prev} to ${scoresBySession[sessionId][userId]}`); } else { scoresBySession[sessionId][userId] = prev + 1; } } else if (allowPenalty) { scoresBySession[sessionId][userId] = Math.max(0, prev - 1); } broadcast(sessionId, { type: 'SCORE_UPDATE_BROADCAST', payload: { scores: scoresBySession[sessionId] } }); if (IS_PROD) { if (isCorrect) { await pool.query('UPDATE game_statistics SET total_correct_eats = total_correct_eats + 1 WHERE id = 1'); } else { await pool.query('UPDATE game_statistics SET total_wrong_eats = total_wrong_eats + 1 WHERE id = 1'); } } } // When a player selects a color, broadcast it to the session if (data.type === 'SELECT_COLOR') { const { sessionId, userId, color } = data.payload; if (sessions[sessionId]) { // Find the client who sent the message and assign them the color for (const client of sessions[sessionId]) { if (client.userId === userId) { client.color = color; break; } } // Collect all taken colors in the session const takenColors = Array.from(sessions[sessionId]) .map(client => client.color) .filter(c => c); broadcast(sessionId, { type: 'COLOR_UPDATE', payload: { takenColors } }); } // If in production, update the database with the color selection if (IS_PROD && color) { await pool.query( `UPDATE game_statistics SET hippo_color_counts = jsonb_set( hippo_color_counts, '{${color}}', (COALESCE(hippo_color_counts->>'${color}', '0')::int + 1)::text::jsonb ) WHERE id = 1` ); } } // When a client requests an update on taken colors, broadcast the current state if (data.type === 'REQUEST_COLOR_UPDATE') { const { sessionId } = data.payload; if (sessions[sessionId]) { const takenColors = Array.from(sessions[sessionId]) .map(client => client.color) .filter(c => c); broadcast(sessionId, { type: 'COLOR_UPDATE', payload: { takenColors } }); } } // When a presenter clicks "End Game", broadcast to all clients in the session if (data.type === 'RESET_GAME') { const { sessionId } = data.payload; console.log('[WSS] RESET_GAME received for session', sessionId); // Reset scores to 0 for Hippo Players if (scoresBySession[sessionId]) { console.log('[WSS] Scores before reset:', scoresBySession[sessionId]); for (const client of sessions[sessionId]) { if (client.role === 'Hippo Player') { console.log(`[WSS] Resetting score for ${client.userId}`); scoresBySession[sessionId][client.userId] = 0; } } console.log('[WSS] Scores after reset:', scoresBySession[sessionId]); } else { console.log('[WSS] No scores found for session', sessionId); } // Send updated scores to all clients broadcast(sessionId, { type: 'SCORE_UPDATE_BROADCAST', payload: { scores: scoresBySession[sessionId] } }); // Notify clients to reset game UI broadcast(sessionId, { type: 'RESET_GAME_BROADCAST', payload: {}, }); } } catch (error) { console.error('WSS Error processing message:', error); sendError(ws, { message: 'Server error' }); } }); ws.on('close', async () => { const { sessionId, userId } = ws; if (!sessionId || !userId) { console.log('WSS Client disconnected without session or user ID'); return; } console.log(`WSS Client ${userId} disconnected from session ${sessionId}`); let remainingPlayers = 0; if (IS_PROD && sessionId && userId) { try { await pool.query('DELETE FROM players WHERE session_id = $1 AND user_id = $2', [sessionId, userId]); const result = await pool.query('SELECT COUNT(*) FROM players WHERE session_id = $1', [sessionId]); remainingPlayers = parseInt(result.rows[0].count, 10); // If no players remain, remove the session from the database if (remainingPlayers === 0) { await pool.query('DELETE FROM sessions WHERE session_id = $1', [sessionId]); console.log(`WSS Session ${sessionId} was empty and has been removed from the database.`); } else { console.log(`WSS Player ${userId} removed from session ${sessionId}. Remaining players: ${remainingPlayers}`); } } catch (err) { console.error('Error removing player from database:', err); } } // Remove the session from the sessions object if it is empty if (sessions[sessionId] && sessions[sessionId].size === 0) { cleanupSession(sessionId); delete sessions[sessionId]; } // If the role is Presenter and the game hasn't started, broadcast SESSION_CLOSED if (userId === 'presenter' && sessions[sessionId] && !sessions[sessionId].gameStarted) { console.log(`[WSS] Presenter for session ${sessionId} disconnected. Starting 5s reconnect timer...`); reconnectionTimers[sessionId] = setTimeout(async () => { // Before closing, double-check if the presenter has rejoined. const sessionClients = sessions[sessionId] ? Array.from(sessions[sessionId]) : []; const isPresenterConnected = sessionClients.some(client => client.role === 'Presenter'); if (!isPresenterConnected) { console.log(`[WSS] Presenter for ${sessionId} did not reconnect in time. Closing session.`); broadcast(sessionId, { type: 'SESSION_CLOSED' }); cleanupSession(sessionId); delete sessions[sessionId]; if (IS_PROD) { try { await pool.query('DELETE FROM sessions WHERE session_id = $1', [sessionId]); console.log(`[WSS] Deleted timed-out session ${sessionId} from database.`); } catch (err) { console.error(`[WSS] Error deleting timed-out session ${sessionId} from DB:`, err); } } } else { console.log(`[WSS] Reconnect timer for ${sessionId} fired, but presenter has returned. Aborting closure.`); } delete reconnectionTimers[sessionId]; }, 5000); } // Remove the client from the ws if (sessions[sessionId]) { sessions[sessionId].delete(ws); // If the session still exists, broadcast the updated user list const usersInSession = Array.from(sessions[sessionId]) .filter(client => client.readyState === WebSocket.OPEN) .map(client => ({ userId: client.userId, role: client.role })); broadcast(sessionId, { type: 'USERS_LIST_UPDATE', payload: { users: usersInSession } }); // After a player leaves, re-calculate the taken colors and notify everyone. const takenColors = Array.from(sessions[sessionId]) .map(client => client.color) .filter(c => c); broadcast(sessionId, { type: 'COLOR_UPDATE', payload: { takenColors } }); console.log(`WSS Player left, broadcasting updated USERS_LIST_UPDATE to ${sessionId}:`, usersInSession); } // Remove the session from the sessions object if it is empty // if (sessions[sessionId].size === 0) { // delete sessions[sessionId]; // } }); }); /** * Helper function to broadcast a message to all clients in a specific session * @param {string} sessionId The ID of the session room * @param {object} data The data to send */ function broadcast(sessionId, data) { if (sessions[sessionId]) { sessions[sessionId].forEach(client => { if (client.readyState === WebSocket.OPEN) { try { client.send(JSON.stringify(data)); } catch (err) { console.error('Error broadcasting to client:', err); } } }); } } /** * Generates a random alphanumeric session ID consisting of uppercase letters and digits. * * @param {number} length - The desired length of the session ID. Defaults to 5. * @returns {string} A randomly generated session ID. */ function generateSessionId(length = 5) { const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; let id = ''; for (let i = 0; i < length; i++) { id += chars[Math.floor(Math.random() * chars.length)]; } return id; } /** * Generates a unique session ID that does not exist in the given array of existing session IDs. * * @param {string[]} existingSessions - An array of session IDs that are already taken. * @param {number} length - The desired length of the new session ID. Defaults to 5. * @returns {string} A new unique session ID not present in the existingSessions array. * */ function generateUniqueSessionId(existingSessions, length = 5) { let newId; let attempts = 0; const maxAttempts = 1000; do { if (attempts >= maxAttempts) { throw new Error('Max attempts reached'); } newId = generateSessionId(length); attempts++; } while (existingSessions.includes(newId)); return newId; } const PORT = process.env.PORT || 4000; // Start the Express server setupDatabase().then(() => { server.listen(PORT, () => { console.log(`Server listening on ${PORT}`); }); }); function cleanupSession(sessionId) { // Clear fruit interval if present if (fruitIntervals[sessionId]) { clearInterval(fruitIntervals[sessionId]); delete fruitIntervals[sessionId]; } // Remove all per-session state delete activeFoods[sessionId]; delete fruitQueues[sessionId]; delete scoresBySession[sessionId]; delete sessionGameModes[sessionId]; delete lastSpawnAt[sessionId]; } // ---- Queue Management Helpers ---- function enqueueFruit(sessionId, fruit, { front = false } = {}) { if (!fruitQueues[sessionId]) fruitQueues[sessionId] = []; if (front) { fruitQueues[sessionId].unshift(fruit); } else { fruitQueues[sessionId].push(fruit); } // Trim after any mutation if (fruitQueues[sessionId].length > QUEUE_MAX) { fruitQueues[sessionId] = fruitQueues[sessionId].slice(0, QUEUE_MAX); } } function dequeueFruit(sessionId) { if (!fruitQueues[sessionId] || fruitQueues[sessionId].length === 0) return null; return fruitQueues[sessionId].shift(); } function clearFruitQueue(sessionId) { fruitQueues[sessionId] = []; } function sendError(ws, { code = 'SERVER_ERROR', message, ...meta }) { ws.send( JSON.stringify({ type: 'ERROR_MESSAGE', payload: { code, message, ...meta }, }), ); } |