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johnlauerjohnlauer
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First major checkin. Windows only working right now.
Ajax server working. List ports working. Serial send/receive working. Former-commit-id: 50b35315b4a4eb8805b272befbbe31890878e383
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‎.project‎

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>sps</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>com.googlecode.goclipse.goBuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>goclipse.goNature</nature>
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</natures>
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</projectDescription>

‎A_WebSocket_Example.md‎

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This gist is the source code for http://gary.beagledreams.com/page/go-websocket-chat.html
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Copyright (c) 2013 Gary Burd
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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‎conn.go‎

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package main
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import (
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"github.com/gorilla/websocket"
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"log"
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"net/http"
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)
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type connection struct {
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// The websocket connection.
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ws *websocket.Conn
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// Buffered channel of outbound messages.
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send chan []byte
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}
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func (c *connection) reader() {
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for {
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_, message, err := c.ws.ReadMessage()
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if err != nil {
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break
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}
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h.broadcast <- message
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}
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c.ws.Close()
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}
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func (c *connection) writer() {
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for message := range c.send {
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err := c.ws.WriteMessage(websocket.TextMessage, message)
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if err != nil {
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break
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}
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}
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c.ws.Close()
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}
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func wsHandler(w http.ResponseWriter, r *http.Request) {
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log.Print("Started a new websocket handler")
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ws, err := websocket.Upgrade(w, r, nil, 1024, 1024)
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if _, ok := err.(websocket.HandshakeError); ok {
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http.Error(w, "Not a websocket handshake", 400)
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return
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} else if err != nil {
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return
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}
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c := &connection{send: make(chan []byte, 256), ws: ws}
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h.register <- c
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defer func() { h.unregister <- c }()
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go c.writer()
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c.reader()
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}

‎dummy.go‎

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package main
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import (
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"log"
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"time"
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)
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type dummy struct {
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//myvar mytype string
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}
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var d = dummy{
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//myvar: make(mytype string),
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}
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func (d *dummy) run() {
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for {
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//h.broadcast <- message
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log.Print("dummy data")
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h.broadcast <- []byte("dummy data")
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time.Sleep(15000 * time.Millisecond)
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}
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}

‎home.html‎

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<html>
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<head>
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<title>Serial Port Example</title>
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<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
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<script type="text/javascript">
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$(function() {
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var conn;
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var msg = $("#msg");
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var log = $("#log");
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function appendLog(msg) {
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var d = log[0]
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var doScroll = d.scrollTop == d.scrollHeight - d.clientHeight;
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msg.appendTo(log)
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if (doScroll) {
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d.scrollTop = d.scrollHeight - d.clientHeight;
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}
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}
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$("#form").submit(function() {
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if (!conn) {
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return false;
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}
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if (!msg.val()) {
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return false;
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}
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conn.send(msg.val());
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msg.val("");
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return false
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});
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if (window["WebSocket"]) {
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conn = new WebSocket("ws://{{$}}/ws");
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conn.onclose = function(evt) {
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appendLog($("<div><b>Connection closed.</b></div>"))
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}
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conn.onmessage = function(evt) {
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appendLog($("<div/>").text(evt.data))
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}
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} else {
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appendLog($("<div><b>Your browser does not support WebSockets.</b></div>"))
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}
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});
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</script>
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<style type="text/css">
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html {
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overflow: hidden;
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}
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body {
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overflow: hidden;
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padding: 0;
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margin: 0;
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width: 100%;
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height: 100%;
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background: gray;
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}
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#log {
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background: white;
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margin: 0;
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padding: 0.5em 0.5em 0.5em 0.5em;
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position: absolute;
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top: 0.5em;
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left: 0.5em;
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right: 0.5em;
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bottom: 3em;
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overflow: auto;
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}
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#form {
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padding: 0 0.5em 0 0.5em;
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margin: 0;
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position: absolute;
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bottom: 1em;
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left: 0px;
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width: 100%;
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overflow: hidden;
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}
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</style>
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</head>
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<body>
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<div id="log"></div>
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<form id="form">
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<input type="submit" value="Send" />
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<input type="text" id="msg" size="64"/>
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</form>
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</body>
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</html>

‎hub.go‎

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package main
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import (
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"log"
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"strconv"
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"strings"
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)
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type hub struct {
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// Registered connections.
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connections map[*connection]bool
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// Inbound messages from the connections.
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broadcast chan []byte
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// Inbound messages from the system
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broadcastSys chan []byte
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// Register requests from the connections.
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register chan *connection
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// Unregister requests from connections.
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unregister chan *connection
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}
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var h = hub{
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broadcast: make(chan []byte),
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broadcastSys: make(chan []byte),
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register: make(chan *connection),
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unregister: make(chan *connection),
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connections: make(map[*connection]bool),
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}
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func (h *hub) run() {
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for {
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select {
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case c := <-h.register:
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h.connections[c] = true
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case c := <-h.unregister:
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delete(h.connections, c)
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close(c.send)
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case m := <-h.broadcast:
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log.Print("Got a broadcast")
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log.Print(m)
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//log.Print(h.broadcast)
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checkCmd(m)
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log.Print("-----")
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for c := range h.connections {
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select {
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case c.send <- m:
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log.Print("did broadcast to ")
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log.Print(c.ws.RemoteAddr())
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//c.send <- []byte("hello world")
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default:
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delete(h.connections, c)
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close(c.send)
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go c.ws.Close()
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}
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}
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case m := <-h.broadcastSys:
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log.Print("Got a system broadcast")
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log.Print(m)
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log.Print("-----")
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for c := range h.connections {
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select {
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case c.send <- m:
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log.Print("did broadcast to ")
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log.Print(c.ws.RemoteAddr())
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//c.send <- []byte("hello world")
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default:
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delete(h.connections, c)
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close(c.send)
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go c.ws.Close()
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}
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}
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}
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}
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}
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func checkCmd(m []byte) {
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log.Print("Inside checkCmd")
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s := string(m[:])
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log.Print(s)
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sl := strings.ToLower(s)
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if strings.HasPrefix(sl, "open") {
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args := strings.Split(s, " ")
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if len(args) < 3 {
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go spErr("You did not specify a port and baud rate in your open cmd")
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return
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}
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if len(args[1]) < 1 {
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go spErr("You did not specify a serial port")
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return
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}
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baud, err := strconv.Atoi(args[2])
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if err != nil {
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go spErr("Problem converting baud rate " + args[2])
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return
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}
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go spHandlerOpen(args[1], baud)
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} else if strings.HasPrefix(sl, "close") {
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args := strings.Split(s, " ")
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go spClose(args[1])
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} else if strings.HasPrefix(sl, "send ") {
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//args := strings.Split(s, "send ")
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go spWrite(s)
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} else if s == "list" {
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go spList()
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//go getListViaWmiPnpEntity()
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}
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log.Print("Done with checkCmd")
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}

‎main.go‎

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package main
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import (
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"flag"
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"go/build"
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"log"
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"net/http"
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"path/filepath"
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"text/template"
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)
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var (
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addr = flag.String("addr", ":8989", "http service address")
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assets = flag.String("assets", defaultAssetPath(), "path to assets")
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homeTempl *template.Template
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)
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func defaultAssetPath() string {
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//p, err := build.Default.Import("gary.burd.info/go-websocket-chat", "", build.FindOnly)
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p, err := build.Default.Import("github.com/johnlauer/serial-port-json-server", "", build.FindOnly)
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if err != nil {
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return "."
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}
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return p.Dir
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}
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func homeHandler(c http.ResponseWriter, req *http.Request) {
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homeTempl.Execute(c, req.Host)
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}
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func main() {
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//getList()
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flag.Parse()
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f := flag.Lookup("addr")
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log.Print("Started server and websocket on localhost" + f.Value.String())
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homeTempl = template.Must(template.ParseFiles(filepath.Join(*assets, "home.html")))
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// launch the hub routine which is the singleton for the websocket server
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go h.run()
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// launch our serial port routine
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go sh.run()
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// launch our dummy data routine
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//go d.run()
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http.HandleFunc("/", homeHandler)
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http.HandleFunc("/ws", wsHandler)
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if err := http.ListenAndServe(*addr, nil); err != nil {
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log.Fatal("ListenAndServe:", err)
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}
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}

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