AWS Lambda RDS connection timeout

Question

I\'m trying to write a Lambda function using Node.js which connects to my RDS database. The database is working and accessible from my Elastic Beanstalk environment. When I

Answer 1

the connection.end() should be after callback:

so working code:

    'use strict';
var mysql = require('mysql');

var connection = mysql.createConnection({
    host     : 'xxxxxx.amazonaws.com',
    user     : 'testuser',
    password : 'testPWD',
    port     : 3306,
    database: 'testDB',
    debug    : false        
});

module.exports.handler = (event, context, callback) => {
    // **Connection to database**      
    connection.connect(function(err) {
        if (err) {
            console.error('Database connection failed: ' + err.stack);
            context.fail();
            return;
        }
      else{ 
            console.log('Connected to database.');
        }
    });

    connection.query('show tables from testDB', function (error, results, fields) {
        if (error) {
            console.log("error: connection failed with db!");
            connection.destroy();
            throw error;
        } else {
            // connected!
            console.log("info: connection ok with db!");
            console.log(results);
            context.succeed("done");
            callback(error, results);
        }
    });

    //Send API Response
    callback(null, {
        statusCode: '200',
        body: 'succeed',
        headers: {
          'Content-Type': 'application/json',
        },
    });

    //Close Connection
    connection.end(); // Missing this section will result in timeout***

};