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ws.go
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ws.go
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package main
import (
"encoding/json"
"sync/atomic"
"github.com/aofei/air"
"github.com/google/uuid"
"github.com/kdudkov/goatak/pkg/model"
)
type JSONWsHandler struct {
name string
ws *air.WebSocket
ch chan *model.WebUnit
active int32
}
func NewHandler(name string, ws *air.WebSocket) *JSONWsHandler {
return &JSONWsHandler{
name: name,
ws: ws,
ch: make(chan *model.WebUnit, 10),
active: 1,
}
}
func (w *JSONWsHandler) IsActive() bool {
return w != nil && atomic.LoadInt32(&w.active) == 1
}
func (w *JSONWsHandler) stop() {
if atomic.CompareAndSwapInt32(&w.active, 1, 0) {
close(w.ch)
w.ws.Close()
}
}
func (w *JSONWsHandler) writer() {
defer w.stop()
for item := range w.ch {
if w.ws.Closed {
return
}
if item == nil {
continue
}
if b, err := json.Marshal(item); err == nil {
if w.ws.WriteText(string(b)) != nil {
return
}
} else {
return
}
}
}
func (w *JSONWsHandler) SendItem(i *model.Item) bool {
if w == nil || !w.IsActive() {
return false
}
select {
case w.ch <- i.ToWeb():
default:
}
return true
}
func (w *JSONWsHandler) deleteItem(uid string) bool {
if w == nil || !w.IsActive() {
return false
}
select {
case w.ch <- &model.WebUnit{UID: uid, Category: "delete"}:
default:
}
return true
}
func (w *JSONWsHandler) Listen() {
if w.ws.Closed {
return
}
defer w.stop()
go w.writer()
w.ws.Listen()
}
func getWsHandler(app *App) air.Handler {
return func(req *air.Request, res *air.Response) error {
ws, err := res.WebSocket()
if err != nil {
return err
}
name := uuid.New().String()
h := NewHandler(name, ws)
app.logger.Info("ws listener connected")
app.changeCb.Subscribe(name, h.SendItem)
app.deleteCb.Subscribe(name, h.deleteItem)
h.Listen()
app.logger.Info("ws listener disconnected")
app.changeCb.Unsubscribe(name)
app.deleteCb.Unsubscribe(name)
return nil
}
}