209 lines
10 KiB
HTML
209 lines
10 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Server-Sent Events. Room "{{.roomid}}"</title>
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<!-- jQuery -->
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<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
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<script src="http://malsup.github.com/jquery.form.js"></script>
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<!-- EPOCH -->
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<script src="http://d3js.org/d3.v3.min.js"></script>
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<script src="/static/epoch.min.js"></script>
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<link rel="stylesheet" href="/static/epoch.min.css">
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<script src="/static/realtime.js"></script>
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<!-- Latest compiled and minified CSS -->
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
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<!-- Optional theme -->
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css">
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<!-- Latest compiled and minified JavaScript -->
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
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<!-- Primjs -->
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<link href="/static/prismjs.min.css" rel="stylesheet" />
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<script type="text/javascript">
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$(document).ready(function() {
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StartRealtime({{.roomid}}, {{.timestamp}});
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});
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</script>
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<style>
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body { padding-top: 50px; }
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</style>
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</head>
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<body>
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<nav class="navbar navbar-fixed-top navbar-inverse">
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<div class="container">
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<div class="navbar-header">
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<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
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<span class="sr-only">Toggle navigation</span>
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<span class="icon-bar"></span>
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<span class="icon-bar"></span>
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<span class="icon-bar"></span>
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</button>
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<a class="navbar-brand" href="#">Server-Sent Events</a>
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</div>
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<div id="navbar" class="collapse navbar-collapse">
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<ul class="nav navbar-nav">
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<li class="active"><a href="#">Demo</a></li>
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<li><a href="http://www.w3.org/TR/2009/WD-eventsource-20091029/">W3 Standard</a></li>
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<li><a href="http://caniuse.com/#feat=eventsource">Browser Support</a></li>
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<li><a href="http://gin-gonic.github.io/gin/">Gin Framework</a></li>
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<li><a href="https://github.com/gin-gonic/gin/tree/develop/examples/realtime-advanced">Github</a></li>
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</ul>
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</div><!-- /.nav-collapse -->
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</div><!-- /.container -->
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</nav><!-- /.navbar -->
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<!-- Main jumbotron for a primary marketing message or call to action -->
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<div class="jumbotron">
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<div class="container">
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<h1>Server-Sent Events in Go</h1>
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<p>Server-sent events (SSE) is a technology where a browser receives automatic updates from a server via HTTP connection. It is not websockets. <a href="http://www.html5rocks.com/en/tutorials/eventsource/basics/">Learn more.</a></p>
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<p>The chat and the charts data is provided in realtime using the SSE implemention of <a href="https://github.com/gin-gonic/gin/blob/15b0c49da556d58a3d934b86e3aa552ff224026d/examples/realtime-chat/main.go#L23-L32">Gin Framework</a>.</p>
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<div class="row">
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<div class="col-md-8">
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<div id="chat-scroll" style="overflow-y:scroll; overflow-x:scroll; height:290px">
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<table id="table-style" class="table" data-show-header="false">
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<thead>
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<tr>
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<th data-field="nick" class="col-md-2">Nick</th>
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<th data-field="message" class="col-md-8">Message</th>
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</tr>
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</thead>
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<tbody id="chat"></tbody>
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</table>
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</div>
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{{if .nick}}
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<form autocomplete="off" class="form-inline" id="chat-form" action="/room-post/{{.roomid}}?nick={{.nick}}" method="post">
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<div class="form-group">
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<label class="sr-only" for="chat-message">Message</label>
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<div class="input-group">
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<div class="input-group-addon">{{.nick}}</div>
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<input type="text" name="message" id="chat-message" class="form-control" placeholder="a message" value="" />
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</div>
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</div>
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<input type="submit" class="btn btn-primary" value="Send" />
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</form>
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{{else}}
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<form action="" method="get" class="form-inline">
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<legend>Join the SSE real-time chat</legend>
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<div class="form-group">
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<input value='' name="nick" id="nick" placeholder="Your Name" type="text" class="form-control" />
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</div>
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<div class="form-group text-center">
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<input type="submit" class="btn btn-success btn-login-submit" value="Join" />
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</div>
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</form>
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{{end}}
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</div>
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<div class="col-md-4">
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<div id="messagesChart" class="epoch category10"></div>
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<p>
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<span style="font-size:20px; color:#1f77b4">◼︎</span> Users<br>
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<span style="font-size:20px; color:#ff7f0e">◼︎</span> Inbound messages / sec<br>
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<span style="font-size:20px; color:#2ca02c">◼︎</span> Outbound messages / sec<br>
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</p>
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</div>
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</div>
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</div>
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</div>
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<div class="container">
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<div class="row">
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<h2>Realtime server Go stats</h2>
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<div class="col-md-6">
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<h3>Memory usage</h3>
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<p>
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<div id="heapChart" class="epoch category20c"></div>
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</p>
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<p>
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<span style="font-size:20px; color:#1f77b4">◼︎</span> Heap bytes<br>
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<span style="font-size:20px; color:#aec7e8">◼︎</span> Stack bytes<br>
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</p>
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</div>
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<div class="col-md-6">
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<h3>Allocations per second</h3>
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<p>
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<div id="mallocsChart" class="epoch category20b"></div>
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</p>
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<p>
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<span style="font-size:20px; color:#393b79">◼︎</span> Mallocs / sec<br>
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<span style="font-size:20px; color:#5254a3">◼︎</span> Frees / sec<br>
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</p>
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</div>
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</div>
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<div class="row">
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<h2>MIT Open Sourced</h2>
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<ul>
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<li><a href="https://github.com/gin-gonic/gin/tree/develop/examples/realtime-advanced">This demo website (JS and Go)</a></li>
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<li><a href="https://github.com/manucorporat/sse">The SSE implementation in Go</a></li>
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<li><a href="https://github.com/gin-gonic/gin">The Web Framework (Gin)</a></li>
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</ul>
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<div class="col-md-6">
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<script src="/static/prismjs.min.js"></script>
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<h3>Server-side (Go)</h3>
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<pre><code class="language-go">func streamRoom(c *gin.Context) {
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roomid := c.ParamValue("roomid")
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listener := openListener(roomid)
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statsTicker := time.NewTicker(1 * time.Second)
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defer closeListener(roomid, listener)
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defer statsTicker.Stop()
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c.Stream(func(w io.Writer) bool {
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select {
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case msg := <-listener:
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c.SSEvent("message", msg)
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case <-statsTicker.C:
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c.SSEvent("stats", Stats())
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}
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return true
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})
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}</code></pre>
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</div>
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<div class="col-md-6">
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<h3>Client-side (JS)</h3>
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<pre><code class="language-javascript">function StartSSE(roomid) {
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var source = new EventSource('/stream/'+roomid);
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source.addEventListener('message', newChatMessage, false);
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source.addEventListener('stats', stats, false);
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}</code></pre>
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</div>
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</div>
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<div class="row">
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<div class="col-md-12">
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<h3>SSE package</h3>
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<pre><code class="language-go">import "github.com/manucorporat/sse"
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func httpHandler(w http.ResponseWriter, req *http.Request) {
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// data can be a primitive like a string, an integer or a float
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sse.Encode(w, sse.Event{
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Event: "message",
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Data: "some data\nmore data",
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})
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// also a complex type, like a map, a struct or a slice
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sse.Encode(w, sse.Event{
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Id: "124",
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Event: "message",
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Data: map[string]interface{}{
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"user": "manu",
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"date": time.Now().Unix(),
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"content": "hi!",
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},
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})
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}</code></pre>
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<pre>event: message
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data: some data\\nmore data
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id: 124
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event: message
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data: {"content":"hi!","date":1431540810,"user":"manu"}</pre>
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</div>
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</div>
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<hr>
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<footer>
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<p>Created with <span class="glyphicon glyphicon-heart"></span> by <a href="https://github.com/manucorporat">Manu Martinez-Almeida</a></p>
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</footer>
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</div>
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</body>
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</html>
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