Microservices and javascript on the
server-side
Libor Vilímek

Switching to Node.js
Easy to learn
Easy to use
Easy to become Node.js wizard

Hypetrain is real

Node.js quick summary
One thread – no deadlocks, not expensive thread creation
Npm install – as easy as possible
Javascript – allows almost anything
Public modules – always open source, huge community
Asynchronous – no worker threads

No more copy-paste solutions

Advantages of small projects
Smaller codebase – easier to maintain
Change-requests are much more efficient
Easy to understand – join and understand new project fast
Less bugs – due to lower complexity

Microservices!!
Build your application as multiple independent projects
Use lightweight communication (i.e. REST API)
Create its own database for each microservice

Microservices in 2017
Automated deploy – programmer does not have to manually compile and
upload to server
Healthchecks – admin does not have „watch“ and repair failing service
Docker – admin/programmer does not have to configure each service
Cloud hosting – cheap, almost no maintance

Advantages of Microservices
Modularity – you can easily deploy one microservice in more applications
Development – more developers can work on the same application
Small codebase – it has all the advantages of small projects
Scalability – different number of instances for each microservice

App4Fest architecture

Pitfalls of Microservice Architecture
Stateless – never ever do transactions through microservices
Data – more databases = count on desynchronized data
„Microservices are great, lets split everything into them“
Have active communication between teams

exports.createPayment = function(object, cb) {
var rand = Math.abs((Math.random() * (9999999999 - 1) + 1) | 0).toString();
// console.log(rand);
Payment.findOne({vs: rand}, function(err, obj) {
if (obj) {
rand = Math.abs((Math.random() * (9999999999 - 1) + 1) | 0).toString();
// console.log(rand);
Payment.findOne({vs: rand}, function(err, obj) {
if (obj) {
rand = Math.abs((Math.random() * (9999999999 - 1) + 1) | 0).toString();
// console.log(rand);
Payment.findOne({vs: rand}, function(err, obj) {
if (obj) {
rand = Math.abs((Math.random() * (9999999999 - 1) + 1) | 0).toString();
// console.log(rand);
Payment.findOne({vs: rand}, function(err, obj) {
if (obj) {
rand = Math.abs((Math.random() * (9999999999 - 1) + 1) | 0).toString();
// console.log(rand);
Payment.findOne({vs: rand}, function(err, obj) {
if (obj) {
cb(1, null);
} else {
object.vs = rand;
var create = new Payment(object);
create.save(function(err, payment) {
cb(err, payment);
});
}
});

Bad code destroys even great design

What you get with CI, Node.js and
Microservices
Quick development
Easy maintance
You can fire admin team (finally)
No server downtime

Special slide for business inteligence
sitting here

www.ackee.cz
Krásní lidé, krásné appky