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https://github.com/centrifugal/centrifugo

Scalable real-time messaging server in a language-agnostic way. Self-hosted alternative to Pubnub, Pusher, Ably. Set up once and forever.
https://github.com/centrifugal/centrifugo

eventsource grpc http-streaming http3 messaging pubsub real-time redis scalability sockjs sse streaming websocket websockets webtransport

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Scalable real-time messaging server in a language-agnostic way. Self-hosted alternative to Pubnub, Pusher, Ably. Set up once and forever.

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README 

        
Centrifugo is an open-source scalable real-time messaging server. Centrifugo can instantly deliver messages to application online users connected over supported transports (WebSocket, HTTP-streaming, SSE/EventSource, GRPC, WebTransport). Centrifugo has the concept of channel subscriptions – so it's a user-facing PUB/SUB server.



Centrifugo is language-agnostic and can be used to build chat apps, live comments, multiplayer games, real-time data visualizations, collaborative tools, etc. in combination with any backend. It is well suited for modern architectures and allows decoupling the business logic from the real-time transport layer.



Several official client SDKs for browser and mobile development wrap the bidirectional protocol. In addition, Centrifugo supports a unidirectional approach for simple use cases with no SDK dependency.



## Documentation



* [Centrifugo official documentation site](https://centrifugal.dev)

* [Installation instructions](https://centrifugal.dev/docs/getting-started/installation)

* [Getting started tutorial](https://centrifugal.dev/docs/getting-started/quickstart)

* [Design overview and idiomatic usage](https://centrifugal.dev/docs/getting-started/design)

* [Build a WebSocket chat/messenger app with Centrifugo](https://centrifugal.dev/docs/tutorial/intro) tutorial

* [Centrifugal blog](https://centrifugal.dev/blog)

* [FAQ](https://centrifugal.dev/docs/faq)



## Join community



* [Telegram](https://t.me/joinchat/ABFVWBE0AhkyyhREoaboXQ)

* [Discord](https://discord.gg/tYgADKx)

* [Twitter](https://twitter.com/centrifugalabs)



## Why Centrifugo



The core idea of Centrifugo is simple – it's a PUB/SUB server on top of modern real-time transports:






The hard part is to make this concept production-ready, efficient, flexible and available from different application environments. Centrifugo is a mature solution that already helped many projects with adding real-time features and scale towards many concurrent connections. Centrifugo provides a set of features not available in other open-source solutions in the area:



* Efficient real-time transports: WebSocket, HTTP-streaming, Server-Sent Events (SSE), GRPC, WebTransport

* Built-in scalability with Redis (or Redis Cluster, or Redis-compatible storage – ex. AWS Elasticache, KeyDB, DragonflyDB, etc), or Nats.

* Simple HTTP and GRPC server API to communicate with Centrifugo from the app backend

* Flexible connection authentication mechanisms: JWT and proxy-like

* Channel subscription multiplexing over a single connection

* Different types of subscriptions: client-side and server-side

* Various channel permission strategies, channel namespace concept

* Hot message history in channels, with automatic message recovery upon reconnect, cache recovery mode (deliver latest publication immediately upon subscription)

* Delta compression in channels based on Fossil algorithm

* Online channel presence information, with join/leave notifications

* A way to send RPC calls to the backend over the real-time connection

* Strict and effective client protocol wrapped by several official SDKs

* JSON and binary Protobuf message transfer, with optimized serialization

* Beautiful embedded admin web UI

* And much more, visit [Centrifugo documentation site](https://centrifugal.dev)



## Backing



This repository is hosted by [packagecloud.io](https://packagecloud.io/).



Private NPM registry and Maven, RPM, DEB, PyPi and RubyGem Repository · packagecloud



Also thanks to [JetBrains](https://www.jetbrains.com/) for supporting OSS (most of the code here written in Goland):



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