Clojure core.async interface to Jetty7's websockets.
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Jetty 7 websockets async

Did you know that your familiar friend Jetty 7 (of ring-jetty-adapter fame) can talk websockets? This library provides a Jetty 7 configurator that exposes websockets as core.async channels.

Install | Server quick-start | Client quick-start | Example app | Thanks! | Similar libraries


Add to your project.clj:

[com.keminglabs/jetty7-websockets-async "0.1.0"]

See the in-depth example for fancy core.match message dispatch and a core.async client in ClojureScript.

Server quick start

(require '[com.keminglabs.jetty7-websockets-async.core :refer [configurator]]
         '[clojure.core.async :refer [chan go >! <!]]
         '[ring.adapter.jetty :refer [run-jetty]])

(defn http-handler
  {:response 200 :body "HTTP hello" :headers {}})

(def c (chan))

(def ws-configurator
  (configurator c {:path "/"}))

(def server
  (run-jetty http-handler {:configurator ws-configurator
                           :port 8090, :join? false}))

(go (loop []
      (let [ws-req (<! c)]
        (>! (:in ws-req) "Hello new websocket client!")

Client quick start

(require '[com.keminglabs.jetty7-websockets-async.core :refer [connect!]]
         '[clojure.core.async :refer [chan go >! <!]])

(def c (chan))

(connect! c "ws://remote-server")

(go (loop []
      (let [ws-req (<! c)]
        (>! (:in ws-req) "Hello remote websocket server!")


Zach Allaun for suggesting that the websocket server and client code could be handled symmetrically.

Similar libraries

Take a look at @ptaoussanis's Sente, which provides channels over WebSockets and Ajax on the http-kit server.