What
Database changes notification library.
Example
/main.go
package main
import (
"encoding/json"
"log"
"net/http"
"git.icod.de/dalu/notifier"
"github.com/gin-gonic/gin"
"gopkg.in/olahol/melody.v1"
)
func main() {
r := gin.Default()
m := melody.New()
n := notifier.NewNotifier(m)
h := NewHandler(n)
r.GET("/", h.Index)
r.GET("/ws", func(cx *gin.Context) {
m.HandleRequest(cx.Writer, cx.Request)
})
r.GET("/acme/ins", h.InsertDB)
go n.Listen(func(notification *notifier.Notification) {
b, e := json.Marshal(notification)
if e != nil {
log.Println(e.Error())
return
}
m.Broadcast(b)
})
r.Run(":5000")
}
type Handler struct {
notifier *notifier.Notifier
}
func NewHandler(n *notifier.Notifier) *Handler {
h := new(Handler)
h.notifier = n
return h
}
func (h *Handler) Index(cx *gin.Context) {
http.ServeFile(cx.Writer, cx.Request, "index.html")
}
func (h *Handler) InsertDB(cx *gin.Context) {
// Do database insert stuff
h.notifier.Notify("acme", "INSERT", []byte(`{"id": 1, "name": acme}`))
cx.JSON(201, map[string]interface{}{"status": "ok"})
}
/index.html
<html>
<head>
<title>Melody example: chatting</title>
</head>
<style>
#chat {
text-align: left;
background: #f1f1f1;
width: 500px;
min-height: 300px;
padding: 20px;
}
</style>
<body>
<div align="center">
<h3>Chat</h3>
<pre id="chat"></pre>
</div>
<script>
let url = "ws://localhost:5000/ws";
let ws = new WebSocket(url);
let chat = document.getElementById("chat");
let now = function () {
let iso = new Date().toISOString();
return iso.split("T")[1].split(".")[0];
};
ws.onmessage = function (msg) {
let line = now() + " " + msg.data + "\n";
chat.innerText += line;
};
</script>
</body>
</html>
then run
go run main.go
curl localhost:5000/acme/ins
.
├── index.html
└── main.go
0 directories, 2 files