Scalable socketio server

Shows a list of IP addresses viewing the page Application launched with docker: node server with redis server as a message broker for scaling and nginx server as a balancer and web server for static client files (index.html and index.js)

Installation

1. git clone this repo
2. Make sure you use latest docker and docker-compose
3. Run yarn build from client directory to create dist/index.js bundle
4. Run docker-compose up. It builds web, redis and socket-server containers for you. Run docker-compose build if you want to rebuild containers
5. Site available on 0.0.0.0:80 on Unix-like systems (check ifconfig to find correct IP if not)

Development

Client uses Webpack to create bundle dist/index.js. If something changed in client/src directory, yarn build should be launched to update index.js bundle

Automated Test

1. Unit tests launch yarn test-unit
2. Functional tests must be launched in docker env like docker exec currentlyviewingapp_socket-server_1 yarn test-func

Manual Test

!!!NOTE!!! In purpose of testing on one machine, websocket server doesn't use real IPs, but number which changed every 10 seconds.

When user opens a tab in browser, number N assigned to this tab via socket connection.

When user opens the second tab in browser, application assigns the same number N or the new number M.

IF the second tab assigned with number N and user closes the first tab, it's "IP-number" still in the list, because there is at least one tab. It allows to see how would it work if user opens many tabs from the same and different computers.

Uncomment server/src/index.js:15 if you wish to see real IP addresses (requires to restart docker container)

TODOs

1. add deploy script to launch yarn build before docker containers start. Ignore client index.js bundle from get repo