add websockets to get downloads list

main.go

@@ -15,6 +15,7 @@ import (
 	"time"
 
 	"go.senan.xyz/taglib"
+	"golang.org/x/net/websocket"
 )
 
 func sendJSON(w http.ResponseWriter, data any, status int) {
@@ -71,6 +72,42 @@ func main() {
 
 	mux := http.NewServeMux()
 
+	wsServer := websocket.Server{
+		Handler: func(c *websocket.Conn) {
+			for {
+				time.Sleep(1 * time.Second)
+
+				type item struct {
+					ID             int                  `json:"id"`
+					Album          monochrome.AlbumInfo `json:"album"`
+					Status         DownloadStatus       `json:"status"`
+					InstalledFiles int                  `json:"installedFiles"`
+					TotalFiles     int                  `json:"totalFiles"`
+				}
+				items := []item{}
+				for id, download := range downloads {
+					items = append(items, item{
+						ID:             id,
+						Album:          download.Album,
+						Status:         download.Status,
+						InstalledFiles: download.InstalledFiles,
+						TotalFiles:     download.TotalFiles,
+					})
+				}
+
+				if err := json.NewEncoder(c).Encode(struct {
+					Downloads []item `json:"downloads"`
+				}{
+					Downloads: items,
+				}); err != nil {
+					continue
+				}
+			}
+		},
+	}
+
+	mux.HandleFunc("GET /ws/downloads", wsServer.ServeHTTP)
+
 	mux.HandleFunc("GET /", func(w http.ResponseWriter, r *http.Request) {
 		path := r.URL.Path
 		if path == "/" {
@@ -107,25 +144,6 @@ func main() {
 		}
 	})
 
-	mux.HandleFunc("GET /downloads", func(w http.ResponseWriter, r *http.Request) {
-		type item struct {
-			ID             int                  `json:"id"`
-			Album          monochrome.AlbumInfo `json:"album"`
-			InstalledFiles int                  `json:"installedFiles"`
-			TotalFiles     int                  `json:"totalFiles"`
-		}
-		items := []item{}
-		for id, download := range downloads {
-			items = append(items, item{
-				ID:             id,
-				Album:          download.Album,
-				InstalledFiles: download.InstalledFiles,
-				TotalFiles:     download.TotalFiles,
-			})
-		}
-		sendJSON(w, items, 200)
-	})
-
 	mux.HandleFunc("GET /download-album/{id}", func(w http.ResponseWriter, r *http.Request) {
 		id, err := strconv.Atoi(r.PathValue("id"))
 		if err != nil {