refactor, sketch SSE implementation

handlers/videos.go

@@ -0,0 +1,53 @@
+package handlers
+
+import (
+	"encoding/json"
+	"fmt"
+	"ytdlp-site/originals"
+
+	"github.com/labstack/echo/v4"
+)
+
+func VideosEvents(c echo.Context) error {
+
+	user, err := GetUser(c)
+	if err != nil {
+		return err
+	}
+
+	req := c.Request()
+	res := c.Response()
+
+	// Set headers for SSE
+	res.Header().Set(echo.HeaderContentType, "text/event-stream")
+	res.Header().Set("Cache-Control", "no-cache")
+	res.Header().Set("Connection", "keep-alive")
+
+	// Create a channel to signal client disconnect
+	done := req.Context().Done()
+
+	q := originals.Subscribe(user.Id)
+	defer originals.Unsubscribe(user.Id, q)
+
+	// Send SSE messages
+	for {
+		select {
+		case <-done:
+			return nil
+		default:
+			event := <-q.Ch
+
+			jsonData, err := json.Marshal(event)
+			if err != nil {
+				return err
+			}
+
+			msg := fmt.Sprintf("data: %s\n\n", jsonData)
+			_, err = res.Write([]byte(msg))
+			if err != nil {
+				return err
+			}
+			res.Flush()
+		}
+	}
+}