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websocket.clj
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websocket.clj
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(ns rj9a.websocket
(:gen-class)
(:require [ring.adapter.jetty9 :as jetty]
[ring.websocket :as ringws]))
(defn my-websocket-handler [upgrade-request]
(let [provided-subprotocols (:websocket-subprotocols upgrade-request)
provided-extensions (:websocket-extensions upgrade-request)]
{:ring.websocket/listener {:on-open (fn [socket]
(tap> [:ws :connect]))
:on-message (fn [socket message]
(tap> [:ws :msg message])
(ringws/send socket (str "echo: " message)))
:on-close (fn [socket status-code reason]
(tap> [:ws :close status-code reason]))
:on-pong (fn [socket data]
(tap> [:ws :pong]))
:on-ping (fn [socket data]
(tap> [:ws :ping])
(ringws/pong socket))
:on-error (fn [socket error]
(.printStackTrace error)
(tap> [:ws :error error]))}
:ring.websocket/protocol (first provided-subprotocols)}))
(defn handler [req]
(if (jetty/ws-upgrade-request? req)
(my-websocket-handler req)
{:status 200 :body "hello"}))
(defn async-handler [request send-response _]
(send-response
(if (jetty/ws-upgrade-request? request)
(my-websocket-handler request)
{:status 200 :body "hello"})))
(defonce server (atom nil))
(defn start! [async?]
(when-not @server
(reset! server (jetty/run-jetty
(if async? #'async-handler #'handler)
{:port 5000
:join? false
:async? async?
:allow-null-path-info true}))))
(defn stop! []
(when @server
(jetty/stop-server @server)
(reset! server nil)))
(comment
(start! false)
(stop!))
(defn -main [& _]
(start! false))