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ws.go
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ws.go
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package events
import (
"encoding/json"
"github.com/gorilla/websocket"
"net/http"
"sync"
)
type event struct {
Name string `json:"event"`
Payload interface{} `json:"payload"`
}
type wsStreamer struct {
feedLock sync.Mutex
writers []*websocket.Conn
}
func NewWebsocketStream() *wsStreamer {
return &wsStreamer{}
}
func (ws *wsStreamer) Feed(eventName string, payload interface{}) {
data, _ := json.Marshal(event{
Name: eventName,
Payload: payload,
})
var wg sync.WaitGroup
ws.feedLock.Lock()
defer ws.feedLock.Unlock()
for _, conn := range ws.writers {
wg.Add(1)
go func(conn *websocket.Conn) {
defer wg.Done()
err := conn.WriteMessage(websocket.TextMessage, data)
if err != nil {
_ = conn.Close()
}
}(conn)
}
wg.Wait()
}
func (ws *wsStreamer) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
upgrader := websocket.Upgrader{
ReadBufferSize: 8192,
WriteBufferSize: 8192,
}
defer request.Body.Close()
conn, err := upgrader.Upgrade(writer, request, nil)
if err != nil {
return
}
defer conn.Close()
ws.feedLock.Lock()
ws.writers = append(ws.writers, conn)
ws.feedLock.Unlock()
for {
_, _, err := conn.ReadMessage()
if err != nil {
break
}
}
ws.feedLock.Lock()
for i, w := range ws.writers {
if w == conn {
N := len(ws.writers)
ws.writers[i] = ws.writers[N-1]
ws.writers = ws.writers[:N-1]
break
}
}
ws.feedLock.Unlock()
}