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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