Created
October 10, 2013 00:16
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A UDP echo server in Clojure. http://jvns.ca/blog/2013/10/09/day-7-an-echo-server-in-clojure/
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(ns echo-server | |
(:import (java.net InetAddress DatagramPacket DatagramSocket))) | |
(def udp-server (ref nil)) | |
(def port 12345) | |
(defn localhost [] (. InetAddress getLocalHost)) | |
(defn message [text] | |
(new DatagramPacket (. text getBytes) (. text length) (localhost) port )) | |
(defn send-message [text] | |
(.send @udp-server (message text))) | |
(defn create-udp-server [] | |
(DatagramSocket. port)) | |
(defn start-udp-server [] | |
(dosync (ref-set udp-server (create-udp-server)))) | |
(defn stop-udp-server [] | |
(.close @udp-server)) | |
(start-udp-server) | |
(defn empty-message [n] | |
(new DatagramPacket (byte-array n) n)) | |
(while true (do | |
(def orig-packet (empty-message 1024)) | |
(.receive @udp-server orig-packet) | |
(.send @udp-server orig-packet) | |
(println ( new String (.getData orig-packet) "UTF-8")) | |
) | |
) |
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