update serverless index

Author: lnqminh3003

shatter-backend/api/index.ts

@@ -4,36 +4,58 @@ import app from '../src/app';
 
 const MONGODB_URI = process.env.MONGO_URI;
 
-let cachedConnection: typeof mongoose | null = null;
+let isConnected = false;
 
 async function connectDB() {
-  if (cachedConnection) {
-    return cachedConnection;
+  if (isConnected && mongoose.connection.readyState === 1) {
+    console.log('Using existing MongoDB connection');
+    return;
   }
 
   if (!MONGODB_URI) {
     throw new Error('MONGO_URI is not set in environment variables');
   }
 
-  const conn = await mongoose.connect(MONGODB_URI, {
-    bufferCommands: false, 
-  });
+  try {
+    console.log('Creating new MongoDB connection...');
+    
+    await mongoose.connect(MONGODB_URI, {
+      bufferCommands: false,
+      maxPoolSize: 10,
+      serverSelectionTimeoutMS: 5000,
+      socketTimeoutMS: 45000,
+    });
+
+    isConnected = true;
+    console.log('MongoDB connected successfully');
+
+    mongoose.connection.on('error', (err) => {
+      console.error('MongoDB connection error:', err);
+      isConnected = false;
+    });
+
+    mongoose.connection.on('disconnected', () => {
+      console.log('MongoDB disconnected');
+      isConnected = false;
+    });
 
-  cachedConnection = conn;
-  return conn;
+  } catch (error) {
+    console.error('Failed to connect to MongoDB:', error);
+    isConnected = false;
+    throw error;
+  }
 }
 
-connectDB().catch((err) => {
-  console.error('Failed to connect to MongoDB:', err);
-});
-
 app.use(async (req, res, next) => {
   try {
     await connectDB();
     next();
-  } catch (error) {
+  } catch (error: any) {
     console.error('Database connection error:', error);
-    res.status(500).json({ error: 'Database connection failed' });
+    res.status(500).json({ 
+      error: 'Database connection failed',
+      details: process.env.NODE_ENV === 'development' ? error.message : undefined
+    });
   }
 });