[NFC] Outline database connection into a separate file

server.js

@@ -77,16 +77,10 @@ const config = require('nconf')
 	.file('environment', { file: `config/${process.env.NODE_ENV}.json` })
 	.file('defaults', { file: 'config/default.json' });
 
-//DB
-const mongoose = require('mongoose');
-mongoose.connect(config.get('mongodb_uri') || config.get('mongolab_uri') || 'mongodb://localhost/naturalcrit',
-	{ retryWrites: false });
-mongoose.connection.on('error', (err)=>{
-	console.log('Error : Could not connect to a Mongo Database.');
-	console.log('        If you are running locally, make sure mongodb.exe is running.');
-	console.log(err);
-	throw 'Can not connect to Mongo';
-});
+// DB
+const DB = require('./server/db.js');
+// FIXME: consider implementing error hanlding for a Promise returned by connect
+DB.connect(config);
 
 //Account Middleware
 app.use((req, res, next)=>{

server/db.js

@@ -0,0 +1,37 @@
+const Mongoose = require('mongoose');
+
+const getMongoDBURL = (config)=>{
+	return config.get('mongodb_uri') ||
+           config.get('mongolab_uri') ||
+           'mongodb://localhost/homebrewery';
+};
+
+const disconnect = ()=>{
+	return Mongoose.close();
+};
+
+const connect = (config)=>{
+	const resolver = (resolve, reject)=>{
+		Mongoose.connect(getMongoDBURL(config),
+			{ retryWrites: false },
+			(error)=>{
+				if(error) {
+					console.error('Could not connect to a Mongo Database.');
+					console.log(error);
+					console.error('If you are running locally, make sure mongodb.exe is running.');
+					// FIXME: do we need to pass 'error' to 'reject'?
+					return reject();
+				}
+
+				return resolve();
+			});
+
+	};
+
+	return new Promise(resolver);
+};
+
+module.exports = {
+	connect    : connect,
+	disconnect : disconnect
+};