implements db events

server.js

@@ -15,6 +15,8 @@ const connectionString = `${db.prefix}${db.user}:${db.password}@${db.host}/${db.
 mongoose.connect(connectionString, { useNewUrlParser: true });
 mongoose.set('useFindAndModify', false);
 
+const mongodb = mongoose.connection;
+
 app.use((err, req, res, next) => {
   logger.logError(err);
   res.status(500);
@@ -33,12 +35,24 @@ app.listen(port, () => {
   logger.logConsole('Server started.');
 });
 
+mongodb.on('connected', () => {
+  logger.logInfo('DB connected');
+});
+
+mongodb.on('disconnected', () => {
+  logger.logInfo('DB disconnected');
+});
+
+mongodb.on('error', (err) => {
+  logger.logError(`DB error:' ${err}`);
+});
+
 process.on('uncaughtException', (err) => {
   logger.logError(err);
 });
 
 process.on('SIGINT', () => {
-  mongoose.connection.close();
+  mongoose.disconnect();
   logger.logInfo('Server stopped');
   logger.logConsole('Server stopped');
   process.exit(0);