package api import ( "time" "github.com/gin-gonic/gin" "github.com/gorilla/websocket" "github.com/photoprism/photoprism/internal/config" "github.com/photoprism/photoprism/internal/event" ) var wsConnection = websocket.Upgrader{} var wsTimeout = 60 * time.Second func wsReader(ws *websocket.Conn) { defer ws.Close() ws.SetReadLimit(512) ws.SetReadDeadline(time.Now().Add(wsTimeout)) ws.SetPongHandler(func(string) error { ws.SetReadDeadline(time.Now().Add(wsTimeout)); return nil }) for { _, m, err := ws.ReadMessage() if err != nil { break } log.Debugf("websocket: received %d bytes", len(m)) } } func wsWriter(ws *websocket.Conn, conf *config.Config) { pingTicker := time.NewTicker(10 * time.Second) s := event.Subscribe("log.*", "notify.*", "index.*", "upload.*", "import.*", "config.*", "count.*") defer func() { pingTicker.Stop() event.Unsubscribe(s) ws.Close() }() for { select { case <-pingTicker.C: ws.SetWriteDeadline(time.Now().Add(10 * time.Second)) if err := ws.WriteMessage(websocket.PingMessage, []byte{}); err != nil { return } case msg := <-s.Receiver: ws.SetWriteDeadline(time.Now().Add(10 * time.Second)) if err := ws.WriteJSON(gin.H{"event": msg.Name, "data": msg.Fields}); err != nil { log.Debug(err) return } } } } // GET /api/v1/ws func Websocket(router *gin.RouterGroup, conf *config.Config) { router.GET("/ws", func(c *gin.Context) { w := c.Writer r := c.Request ws, err := wsConnection.Upgrade(w, r, nil) if err != nil { log.Error(err) return } defer ws.Close() log.Debug("websocket: connected") go wsWriter(ws, conf) wsReader(ws) }) }