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Adds realtime-chat example code

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This commit is contained in:
Manu Mtz-Almeida 2015-05-12 19:23:54 +02:00
parent 470b7e1010
commit 15b0c49da5
3 changed files with 135 additions and 0 deletions
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58
examples/realtime-chat/main.go Normal file
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package main
import (
"fmt"
"io"
"math/rand"
"github.com/gin-gonic/gin"
)
func main() {
router := gin.Default()
router.SetHTMLTemplate(html)
router.GET("/room/:roomid", roomGET)
router.POST("/room/:roomid", roomPOST)
router.DELETE("/room/:roomid", roomDELETE)
router.GET("/stream/:roomid", stream)
router.Run(":8080")
}
func stream(c *gin.Context) {
roomid := c.ParamValue("roomid")
listener := openListener(roomid)
defer closeListener(roomid, listener)
c.Stream(func(w io.Writer) bool {
c.SSEvent("message", <-listener)
return true
})
}
func roomGET(c *gin.Context) {
roomid := c.ParamValue("roomid")
userid := fmt.Sprint(rand.Int31())
c.HTML(200, "chat_room", gin.H{
"roomid": roomid,
"userid": userid,
})
}
func roomPOST(c *gin.Context) {
roomid := c.ParamValue("roomid")
userid := c.PostFormValue("user")
message := c.PostFormValue("message")
room(roomid).Submit(userid + ": " + message)
c.JSON(200, gin.H{
"status": "success",
"message": message,
})
}
func roomDELETE(c *gin.Context) {
roomid := c.ParamValue("roomid")
deleteBroadcast(roomid)
}

33
examples/realtime-chat/rooms.go Normal file
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package main
import "github.com/dustin/go-broadcast"
var roomChannels = make(map[string]broadcast.Broadcaster)
func openListener(roomid string) chan interface{} {
listener := make(chan interface{})
room(roomid).Register(listener)
return listener
}
func closeListener(roomid string, listener chan interface{}) {
room(roomid).Unregister(listener)
close(listener)
}
func deleteBroadcast(roomid string) {
b, ok := roomChannels[roomid]
if ok {
b.Close()
delete(roomChannels, roomid)
}
}
func room(roomid string) broadcast.Broadcaster {
b, ok := roomChannels[roomid]
if !ok {
b = broadcast.NewBroadcaster(10)
roomChannels[roomid] = b
}
return b
}

44
examples/realtime-chat/template.go Normal file
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package main
import "html/template"
var html = template.Must(template.New("chat_room").Parse(`
<html>
<head>
<title>{{.roomid}}</title>
<link rel="stylesheet" type="text/css" href="http://meyerweb.com/eric/tools/css/reset/reset.css"/>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.js"></script>
<script src="http://malsup.github.com/jquery.form.js"></script>
<script>
$('#message_form').focus();
$(document).ready(function() {
// bind 'myForm' and provide a simple callback function
$('#myForm').ajaxForm(function() {
$('#message_form').val('');
$('#message_form').focus();
});
if (!!window.EventSource) {
var source = new EventSource('/stream/{{.roomid}}');
source.addEventListener('message', function(e) {
$('#messages').append(e.data + "</br>");
$('html, body').animate({scrollTop:$(document).height()}, 'slow');
}, false);
} else {
alert("NOT SUPPORTED");
}
});
</script>
</head>
<body>
<h1>Welcome to {{.roomid}} room</h1>
<div id="messages"></div>
<form id="myForm" action="/room/{{.roomid}}" method="post">
User: <input id="user_form" name="user" value="{{.userid}}"></input>
Message: <input id="message_form" name="message"></input>
<input type="submit" value="Submit" />
</form>
</body>
</html>
`))