Working

2020-04-09 23:09:33 -06:00 · 2020-04-09 23:09:33 -06:00 · 2578ee1848
commit 2578ee1848
5 changed files with 140 additions and 0 deletions
--- a/README.md
+++ b/README.md
@ -0,0 +1,11 @@
+This is a thing you can run to practice morse code with your friends.
+
+It's very simple.
+It doesn't try to prevent people from screwing with each other,
+or the server.
+
+You can use any key on the keyboard,
+or a mouse button,
+to key down.
+
+Network jitter is going to make this horrible.
--- a/main.go
+++ b/main.go
@ -0,0 +1,57 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"golang.org/x/net/websocket"
+)
+
+type Client struct {
+	ws *websocket.Conn
+	active bool
+}
+
+var clients []Client
+
+func (c Client) Chat() {
+	for c.active {
+		buf := make([]byte, 800)
+		n, err := c.ws.Read(buf)
+		if err != nil {
+			c.active = false
+		}
+		buf = buf[:n]
+
+		for i, o := range clients {
+			if o.active == false {
+				nclients := len(clients)
+				clients[i] = clients[nclients - 1]
+				clients[nclients - 1] = Client{}
+				clients = clients[:nclients - 1]
+			} else if o == c {
+				// Don't send it back to the sending client
+			} else {
+				o.ws.Write(buf)
+			}
+		}
+	}
+}
+
+func ChatServer(ws *websocket.Conn) {
+	me := Client{
+		ws: ws,
+		active: true,
+	}
+	clients = append(clients, me)
+	
+	me.Chat()
+}
+
+func main() {
+	http.Handle("/chat", websocket.Handler(ChatServer))
+	http.Handle("/", http.FileServer(http.Dir("static")))
+	err := http.ListenAndServe(":8080", nil)
+	if err != nil {
+		log.Fatal(err.Error())
+	}
+}
--- a/static/index.html
+++ b/static/index.html
@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Vail</title>
+    <script src="vail.js"></script>
+  </head>
+  <body>
+    <h1>Vail</h1>
+    <div id="output"></div>
+  </body>
+</html>
--- a/static/vail.css
+++ b/static/vail.css
--- a/static/vail.js
+++ b/static/vail.js
@ -0,0 +1,61 @@
+var ac = new AudioContext()
+var gain = ac.createGain()
+gain.connect(ac.destination)
+gain.gain.value = 0.1
+
+var longest = 500
+var audioFreq = 660
+var audioFreqMe = audioFreq * 6 / 5 // I think this works out to a minor third
+var myosc
+
+function message(event) {
+  let duration = Number(event.data) || 0
+  duration = Math.min(duration, longest)
+  
+  let osc = ac.createOscillator()
+  osc.connect(gain)
+  osc.frequency.value = audioFreq
+  osc.start(ac.currentTime)
+  osc.stop(ac.currentTime + (duration * 0.001))
+}
+
+function key(event) {
+  if (event.type.endsWith("down")) {
+    if (! event.repeat) {
+      window.down = event.timeStamp
+    }
+    if (! myosc) {
+      myosc = ac.createOscillator()
+      myosc.connect(gain)
+      myosc.frequency.value = audioFreqMe
+      myosc.start(ac.currentTime)
+    }
+  } else {
+    let duration = event.timeStamp - window.down
+    duration = Math.min(duration, longest)
+    console.log(event.timeStamp, window.down, duration)
+    window.socket.send(duration)
+    
+    if (myosc) {
+      myosc.stop(ac.currentTime)
+      myosc = null
+    }
+  }
+}
+
+function init() {
+  window.socket = new WebSocket("ws://penguin.linux.test:8080/chat")
+  window.socket.addEventListener("message", message)
+
+  document.addEventListener("mousedown", e => key(e))
+  document.addEventListener("mouseup", e => key(e))
+  document.addEventListener("keydown", e => key(e))
+  document.addEventListener("keyup", e => key(e))
+}
+
+
+if (document.readyState === "loading") {
+  document.addEventListener("DOMContentLoaded", init)
+} else {
+  init()
+}