myex-cli/src/db/connection.js

Opinionated Express.js framework with CLI tools

import mongoose from 'mongoose';
import { logger } from '../utils/logger.js';

/**
 * Connect to MongoDB database
 */
export const connectToDatabase = async () => {
  try {
    const connectionString = process.env.MONGODB_URI;
    
    // Set mongoose options
    const options = {
      serverSelectionTimeoutMS: 5000, // Timeout after 5s
    };

    await mongoose.connect(connectionString, options);
    
    logger.info('Connected to MongoDB');
    
    // Handle MongoDB connection events
    mongoose.connection.on('error', (err) => {
      logger.error(`MongoDB connection error: ${err}`);
    });
    
    mongoose.connection.on('disconnected', () => {
      logger.warn('MongoDB disconnected');
    });
    
    // Handle application termination
    process.on('SIGINT', async () => {
      await mongoose.connection.close();
      logger.info('MongoDB connection closed due to app termination');
      process.exit(0);
    });
    
  } catch (error) {
    logger.error(`Error connecting to MongoDB: ${error.message}`);
    process.exit(1);
  }
};