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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, SockJS, WebTransport). Centrifugo has the concept of a channel – 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.

For details, go to the Centrifugo documentation site.

See installation instructions in Centrifugo documentation.

• Centrifugo is fast and capable to scale to millions of simultaneous connections
• Simple integration with any application – Centrifugo works as a separate service, provides HTTP and GRPC API
• Client real-time SDKs for popular frontend environments – for both web and mobile development
• Strict client protocol based on Protobuf schema, with JSON and binary data transfer support
• Bidirectional transport support (WebSocket and SockJS) for full-featured communication
• Unidirectional transport support for simple use cases with zero SDK dependency - use native APIs (SSE, Fetch, WebSocket, GRPC)
• User authentication with JWT or over connection request proxy to the configured HTTP/GRPC endpoint
• Proper connection management and expiration control
• Various types of channel subscriptions: client-side or server-side
• Transform RPC calls sent over real-time transport to the configured HTTP or GRPC endpoint calls
• Presence information for channels (show all active clients in a channel)
• History information for channels (last messages published into a channel)
• Join/leave events for channels (client subscribed/unsubscribed)
• Automatic recovery of missed messages between reconnects over configured retention period
• Built-in administrative web panel
• Cross-platform – works on Linux, macOS and Windows
• Ready to deploy (Docker, RPM/DEB packages, automatic TLS certificates, Prometheus instrumentation, Grafana dashboard)
• Open-source license

This repository is hosted by packagecloud.io.

Also thanks to JetBrains for supporting OSS (most of the code here written in Goland):