XF Addon [2.3.X] [MMO] Centrifugo 2.3.1

Adds integration with Centrifuge.
Centrifugo is a self-hosted service which can handle connections over a variety of real-time transports and provides a simple publish API. Centrifugo integrates well with any application – no need to change an existing application architecture to introduce real-time features. Just let Centrifugo deal with persistent connections.

Great performance
Centrifugo is built in Go language with some smart optimizations inside. It has good performance – test stand with one million WebSocket connections and 30 million delivered messages per minute with hardware comparable to one modern server machine.

Feature-rich
Many built-in features can help to build an attractive real-time application in a limited time. Centrifugo provides different types of subscriptions, hot channel history, instant presence, RPC calls. There is also the possibility to proxy connection events to the application backend over HTTP or GRPC and more.
Built-in Redis, KeyDB, Tarantool engines, or Nats broker make it possible to scale connections over different machines. With consistent sharding of Redis, KeyDB, and Tarantool it's possible to handle millions of active connections with reasonable hardware requirements.

Used in production
Started almost 10 years back then Centrifugo (and Centrifuge library for Go it's built on top of) is a mature server successfully used in production by many companies around the world: Badoo, Ably, ManyChat, Grafana, and others.

What is real-time messaging?
Real-time messaging can help building interactive applications where events can be delivered to users almost immediately after being acknowledged by application backend by pushing data into persistent connection – thus achieving minimal delivery latency.

Chats, live comments, multiplayer games, streaming metrics can be built on top of a real-time messaging system.

Centrifugo handles persistent connections from clients over bidirectional WebSocket, SockJS, and unidirectional SSE (EventSource), HTTP-streaming, GRPC transports and provides API to publish messages to online clients in real-time.