socketizer-service

Socketizer Service

The Websockets and API server behind Socketizer service.

The whole project is based uppon 3 sub-projects:

• Socketizer which is the front-end, that showcases the service, registers new users, made with Python and Django
• Socketizer-Service (this repository) which is the WebSockets server, responsible for pushing live updates to WordPress sites, made with Go
• Socketizer-WordPress which is the WordPress plugin, responsible to call the websocket server API, made with PHP

Demo

You can check the live site at: https://www.socketizer.com/

Configuration of the Server

OS: Ubuntu 16.04 LTS

Supervisor

This service uses Supervisor for process management

• Install supervisor
• Add a SystemD config file supervisor.service as the following

[Unit]
Description=Supervisord Service

[Service]
Restart=on-failure
RestartSec=5s
User=root
ExecStart=/usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf

[Install]
WantedBy=multi-user.target

• Create a configuration directory mkdir /etc/supervisor
• Echo the supervisor config to /etc/supervisor directory echo_supervisord_conf > /etc/supervisor/supervisor.conf
• Change the [include] directive to include configuration files from /etc/supervisor/conf.d such as files = /etc/supervisor/conf.d/*.conf

Raise OS open file limits

Raise to 100.000

edit /etc/security/limits.conf and add the following at the end of the file

 *    soft nofile 100000
 *    hard nofile 100000
 root soft nofile 100000
 root hard nofile 100000

edit /etc/pam.d/common-session and add the following at the end of the file

session required pam_limits.so

edit /etc/pam.d/common-session-noninteractive and add the following at the end of the file

session required pam_limits.so

Raise Supervisor Limits

Raise to 100000

edit /etc/supervisor/supervisord.conf and set minfds= as following

minfds=100000

To pick up the changes you must log out - relogin

Raise Nginx Limits

Raise to 100000

edit /etc/nginx/nginx.conf in two places

1. add worker_rlimit_nofile 100000; after worker_processes (usually near the top of the file
2. at the events block edit worker_connections set worker_connections 100000;

Endpoints

Values inside curly braces state some parameter passed to URL

Websockets

WordPress

Websockets endpoint for WordPress clients

 wss://service.socketizer.com/service/wordpress/live/{hostname}

API

WordPress

a WordPress post (post, comment, bbRpess, WooCommerce) has been updated

/service/api/v1/wordpress/cmd/client/refresh/post/