visionA/local-tool/server/internal/api/ws/flash_ws.go

package ws

import (
	"github.com/gin-gonic/gin"
	"github.com/gorilla/websocket"
)

func FlashProgressHandler(hub *Hub) gin.HandlerFunc {
	return func(c *gin.Context) {
		deviceID := c.Param("id")
		conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
		if err != nil {
			return
		}
		defer conn.Close()

		client := &Client{Conn: conn, Send: make(chan []byte, 20)}
		room := "flash:" + deviceID
		sub := &Subscription{Client: client, Room: room}
		hub.RegisterSync(sub)
		defer hub.Unregister(sub)

		// Read pump — drain incoming messages (ping/pong, close frames)
		go func() {
			defer conn.Close()
			for {
				if _, _, err := conn.ReadMessage(); err != nil {
					break
				}
			}
		}()

		for msg := range client.Send {
			if err := conn.WriteMessage(websocket.TextMessage, msg); err != nil {
				return
			}
		}
	}
}