Sente

Realtime web comms for Clojure/Script

Sente is a small client+server library that makes it easy to build realtime web applications with Clojure + ClojureScript.

Loosely inspired by Socket.IO, it uses core.async, WebSockets, and Ajax under the hood to provide a simple high-level API that enables reliable, high-performance, bidirectional communications.

Sen-te (先手) is a Japanese Go term used to describe a play with such an overwhelming follow-up that it demands an immediate response, leaving its player with the initiative.

Latest release

2023-07-04: 1.18.1 - release notes | Clojars

Resources

Wiki - community docs (👈 start here)
Release info - releases and changes
API docs - auto-generated API docs
GitHub issues - for support requests, contributions, etc.

Features

Bidirectional a/sync comms over WebSockets with auto Ajax fallback
It just works: auto keep-alives, buffering, protocol selection, reconnects
Efficient design with transparent event batching for low-bandwidth use, even over Ajax
Send arbitrary Clojure vals over edn or Transit (JSON, MessagePack, etc.)
Tiny API (see the wiki for details)
Automatic, sensible support for users connected with multiple clients and/or devices simultaneously
Realtime info on which users are connected over which protocols
Standard Ring security model: auth as you like, HTTPS when available, CSRF support, etc.
Support for several popular web servers, easily extended to other servers.

Funding this work

Please see here if you'd like to help support my continued open-source work (thank you!! 🙏) - Peter