mirror of https://github.com/nealey/vail.git
Working
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commit
2578ee1848
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This is a thing you can run to practice morse code with your friends.
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It's very simple.
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It doesn't try to prevent people from screwing with each other,
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or the server.
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You can use any key on the keyboard,
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or a mouse button,
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to key down.
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Network jitter is going to make this horrible.
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package main
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import (
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"log"
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"net/http"
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"golang.org/x/net/websocket"
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)
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type Client struct {
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ws *websocket.Conn
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active bool
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}
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var clients []Client
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func (c Client) Chat() {
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for c.active {
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buf := make([]byte, 800)
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n, err := c.ws.Read(buf)
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if err != nil {
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c.active = false
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}
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buf = buf[:n]
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for i, o := range clients {
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if o.active == false {
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nclients := len(clients)
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clients[i] = clients[nclients - 1]
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clients[nclients - 1] = Client{}
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clients = clients[:nclients - 1]
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} else if o == c {
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// Don't send it back to the sending client
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} else {
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o.ws.Write(buf)
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}
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}
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}
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}
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func ChatServer(ws *websocket.Conn) {
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me := Client{
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ws: ws,
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active: true,
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}
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clients = append(clients, me)
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me.Chat()
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}
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func main() {
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http.Handle("/chat", websocket.Handler(ChatServer))
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http.Handle("/", http.FileServer(http.Dir("static")))
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err := http.ListenAndServe(":8080", nil)
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if err != nil {
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log.Fatal(err.Error())
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}
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}
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@ -0,0 +1,11 @@
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<!DOCTYPE html>
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<html>
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<head>
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<title>Vail</title>
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<script src="vail.js"></script>
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</head>
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<body>
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<h1>Vail</h1>
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<div id="output"></div>
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</body>
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</html>
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var ac = new AudioContext()
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var gain = ac.createGain()
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gain.connect(ac.destination)
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gain.gain.value = 0.1
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var longest = 500
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var audioFreq = 660
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var audioFreqMe = audioFreq * 6 / 5 // I think this works out to a minor third
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var myosc
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function message(event) {
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let duration = Number(event.data) || 0
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duration = Math.min(duration, longest)
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let osc = ac.createOscillator()
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osc.connect(gain)
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osc.frequency.value = audioFreq
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osc.start(ac.currentTime)
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osc.stop(ac.currentTime + (duration * 0.001))
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}
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function key(event) {
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if (event.type.endsWith("down")) {
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if (! event.repeat) {
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window.down = event.timeStamp
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}
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if (! myosc) {
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myosc = ac.createOscillator()
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myosc.connect(gain)
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myosc.frequency.value = audioFreqMe
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myosc.start(ac.currentTime)
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}
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} else {
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let duration = event.timeStamp - window.down
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duration = Math.min(duration, longest)
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console.log(event.timeStamp, window.down, duration)
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window.socket.send(duration)
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if (myosc) {
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myosc.stop(ac.currentTime)
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myosc = null
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}
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}
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}
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function init() {
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window.socket = new WebSocket("ws://penguin.linux.test:8080/chat")
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window.socket.addEventListener("message", message)
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document.addEventListener("mousedown", e => key(e))
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document.addEventListener("mouseup", e => key(e))
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document.addEventListener("keydown", e => key(e))
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document.addEventListener("keyup", e => key(e))
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}
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if (document.readyState === "loading") {
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document.addEventListener("DOMContentLoaded", init)
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} else {
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init()
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}
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