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Darko Luketic 2018-07-22 15:43:40 +02:00
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The MIT License
Copyright (c) 2018 Darko Luketic. https://icod.de
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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README.md Normal file
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# What
Database changes notification library.
### Example
```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"})
}
```
```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>
```

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notifier.go Normal file
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package notifier
import (
"gopkg.in/olahol/melody.v1"
)
type Notifier struct {
channel chan *Notification
Melody *melody.Melody
}
func NewNotifier(m *melody.Melody) *Notifier {
n := new(Notifier)
n.channel = make(chan *Notification)
n.Melody = m
return n
}
func (n *Notifier) Listen(then func(notification *Notification)) {
for {
select {
case noti := <-n.channel:
then(noti)
}
}
}
func (n *Notifier) Notify(collection, type_ string, data []byte) {
n.channel <- &Notification{
Collection: collection,
Type: type_,
Data:data,
}
}
type Notification struct {
Collection string `json:"collection"`
Type string `json:"type"`
Data []byte `json:"data,omitempty"`
}