优化数据库稳定性

server/index.js

@@ -28,6 +28,7 @@ const SESSION_TTL_SECONDS = parseInt(process.env.SESSION_TTL_SECONDS, 10) || 864
 const PASSWORD_ITERATIONS = parseInt(process.env.PASSWORD_ITERATIONS, 10) || 210000;
 const ALLOW_REMOTE_SETUP = process.env.ALLOW_REMOTE_SETUP === 'true';
 const COOKIE_SECURE = process.env.COOKIE_SECURE === 'true';
+const APP_SECRET = process.env.APP_SECRET || crypto.randomBytes(32).toString('hex');
 const RATE_LIMITS = {
   login: { windowMs: 15 * 60 * 1000, max: 8 },
   setup: { windowMs: 10 * 60 * 1000, max: 20 }
@@ -619,6 +620,7 @@ COOKIE_SECURE=${process.env.COOKIE_SECURE || 'false'}
 SESSION_TTL_SECONDS=${process.env.SESSION_TTL_SECONDS || SESSION_TTL_SECONDS}
 PASSWORD_ITERATIONS=${process.env.PASSWORD_ITERATIONS || PASSWORD_ITERATIONS}
 ENABLE_EXTERNAL_GEO_LOOKUP=${process.env.ENABLE_EXTERNAL_GEO_LOOKUP || 'false'}
+APP_SECRET=${process.env.APP_SECRET || APP_SECRET}
 `;
     fs.writeFileSync(path.join(__dirname, '..', '.env'), envContent);
     
@@ -1384,6 +1386,8 @@ app.get('/api/metrics/latency', async (req, res) => {
 const server = http.createServer(app);
 const wss = new WebSocket.Server({ server });
 let isBroadcastRunning = false;
+let cachedLatencyRoutes = null;
+let lastRoutesUpdate = 0;
 
 function broadcast(data) {
   const message = JSON.stringify(data);
@@ -1394,21 +1398,25 @@ function broadcast(data) {
   });
 }
 
-// Broadcast loop
 async function broadcastMetrics() {
   if (isBroadcastRunning) return;
   isBroadcastRunning = true;
   try {
     const overview = await getOverview();
     
-    // Also include latencies in the broadcast to make map lines real-time
-    const [routes] = await db.query(`
-      SELECT r.*, s.url, s.type as source_type
-      FROM latency_routes r 
-      JOIN prometheus_sources s ON r.source_id = s.id
-    `);
+    // Refresh routes list every 60 seconds or if it hasn't been fetched yet
+    const now = Date.now();
+    if (!cachedLatencyRoutes || now - lastRoutesUpdate > 60000) {
+      const [routes] = await db.query(`
+        SELECT r.*, s.url, s.type as source_type
+        FROM latency_routes r 
+        JOIN prometheus_sources s ON r.source_id = s.id
+      `);
+      cachedLatencyRoutes = routes;
+      lastRoutesUpdate = now;
+    }
     
-    const latencyResults = await Promise.all(routes.map(async (route) => {
+    const latencyResults = await Promise.all(cachedLatencyRoutes.map(async (route) => {
       let latency = await cache.get(`latency:route:${route.id}`);
       if (latency === null && route.source_type === 'prometheus') {
         latency = await prometheusService.getLatency(route.url, route.latency_target);
@@ -1478,6 +1486,16 @@ async function start() {
       }
     }, 3600000); // Once per hour
 
+    // Periodic cleanup of sessions Map to prevent memory growth
+    setInterval(() => {
+      const now = Date.now();
+      for (const [sessionId, session] of sessions.entries()) {
+        if (session.expiresAt && session.expiresAt <= now) {
+          sessions.delete(sessionId);
+        }
+      }
+    }, 300000); // Once every 5 minutes
+
     server.listen(PORT, HOST, () => {
       console.log(`\n  🚀 Data Visualization Display Wall (WebSocket Enabled)`);
       console.log(`  📊 Server running at http://${HOST === '0.0.0.0' ? 'localhost' : HOST}:${PORT}`);