v5.1.1

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.

What's changed

Improvements

• Option to extract client connection user ID from HTTP header #730. See documentation for it.
• Speed up channel config operations by using atomic.Value and reduce allocations upon channel namespace extraction by using channel options cache, #727
• New metrics for the size of messages sent and received by Centrifugo real-time transport. Transport messages metrics also include frame_type resolution. Finally all the metrics exposed by Centrifugo are described in docs - see Server observability -> Exposed metrics

Fixes

• Fix Lua redis lib command arguments must be strings or integers script error when calling Redis reversed history and the stream metadata key does not exist, #732
• Fix Centrifugo logo image link in our Grafana dashboard - new revision uploaded

Misc

• Dependencies updated (rueidis, quic-go, etc)
• Improved logging for bidirectional emulation transports and unidirectional transports - avoid unnecessary error logs
• If you represent a business and using Centrifugo - see also the release of Centrifugo PRO v5.1.1