forked from MTSR/mapserver
80 lines
1.2 KiB
Go
80 lines
1.2 KiB
Go
package web
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/json"
|
|
"mapserver/app"
|
|
"math/rand"
|
|
"net/http"
|
|
"sync"
|
|
|
|
"github.com/gorilla/websocket"
|
|
)
|
|
|
|
type WS struct {
|
|
ctx *app.App
|
|
channels map[int]chan []byte
|
|
mutex *sync.RWMutex
|
|
}
|
|
|
|
func NewWS(ctx *app.App) *WS {
|
|
ws := WS{}
|
|
ws.mutex = &sync.RWMutex{}
|
|
ws.channels = make(map[int]chan []byte)
|
|
|
|
return &ws
|
|
}
|
|
|
|
var upgrader = websocket.Upgrader{
|
|
ReadBufferSize: 1024,
|
|
WriteBufferSize: 1024,
|
|
}
|
|
|
|
func (t *WS) OnEvent(eventtype string, o interface{}) {
|
|
data, err := json.Marshal(o)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
buf := new(bytes.Buffer)
|
|
buf.Write([]byte("{\"type\":\""))
|
|
buf.Write([]byte(eventtype))
|
|
buf.Write([]byte("\",\"data\":"))
|
|
buf.Write(data)
|
|
buf.Write([]byte("}"))
|
|
|
|
t.mutex.RLock()
|
|
defer t.mutex.RUnlock()
|
|
|
|
for _, c := range t.channels {
|
|
select {
|
|
case c <- buf.Bytes():
|
|
default:
|
|
}
|
|
}
|
|
}
|
|
|
|
func (t *WS) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
|
|
conn, _ := upgrader.Upgrade(resp, req, nil)
|
|
|
|
id := rand.Intn(64000)
|
|
ch := make(chan []byte)
|
|
|
|
t.mutex.Lock()
|
|
t.channels[id] = ch
|
|
t.mutex.Unlock()
|
|
|
|
for {
|
|
data := <-ch
|
|
err := conn.WriteMessage(websocket.TextMessage, data)
|
|
if err != nil {
|
|
break
|
|
}
|
|
}
|
|
|
|
t.mutex.Lock()
|
|
delete(t.channels, id)
|
|
close(ch)
|
|
t.mutex.Unlock()
|
|
}
|