Centrifugo is a real-time messaging server. It’s language-agnostic and can be used in conjunction with application backend written in any language – Python, Ruby, Perl, PHP, Javascript, Java, Objective-C etc.

Centrifugo runs as separate service and keeps persistent Websocket or SockJS connections from your application clients (from web browsers or other environments like iOS or Android apps). When some event happens you can broadcast it to all interested clients using Centrifugo API.

https://github.com/centrifugal/centrifugo