centrifugal/centrifugo v6.0.3

on GitHub

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 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.

What's changed

Improvements

• Added Valkey - https://valkey.io/ - to the Redis engine integration tests suite. This is becoming important as AWS moves Elasticache to Valkey under the hood.
• Optimizations for unidirectional transports #941
  • uni_sse – now supports writing many messages to the underlying HTTP connection buffer before Flush, thereby inheriting Centrifugo client protocol message batching capabilities. This may result into fewer syscalls => better CPU usage.
  • uni_http_stream – implements the same improvements as uni_sse.
  • uni_websocket – new boolean option uni_websocket.join_push_messages. Once enabled, it allows Centrifugo to join unidirectional Push messages into a single websocket frame. It is a separate option for uni_websocket because, in this case, the client side must be prepared to decode the frame into separate messages. The messages follow the Centrifugal client protocol format (for JSON – new-line delimited). Essentially, this mirrors the format used by Centrifugo for the bidirectional websocket.
  • Reduced allocations during the unidirectional connect stage by eliminating the intermediary ConnectRequest object.
• Optimizations for bidirectional emulation:
  • The http_stream and sse transports used in bidirectional emulation now benefit from the same improvements regarding connection buffer writes as described for unidirectional transports.
  • The /emulation endpoint now uses faster JSON decoder for incoming requests.
• Improved documentation:
  • Enhanced readability in the configuration docs – available options are now clearly visible.
  • More detailed unidirectional protocol description.
  • More structured descriptions for real-time transports with better options visibility.

Miscellaneous

• Centrifugo v6 has been recently released. See the details in the Centrifugo v6 release blog post.
• This release is built with Go 1.23.6.
• See also the corresponding Centrifugo PRO release.