refactoring-1

introduced pipelines and abstracted download process.go in Downloader interface

server/internal/downloaders/downloader.go

@@ -0,0 +1,26 @@
+package downloaders
+
+import (
+	"github.com/marcopiovanello/yt-dlp-web-ui/v3/server/common"
+	"github.com/marcopiovanello/yt-dlp-web-ui/v3/server/internal"
+)
+
+type Downloader interface {
+	Start() error
+	Stop() error
+	Status() *internal.ProcessSnapshot
+
+	SetOutput(output internal.DownloadOutput)
+	SetProgress(progress internal.DownloadProgress)
+	SetMetadata(fetcher func(url string) (*common.DownloadMetadata, error))
+	SetPending(p bool)
+
+	IsCompleted() bool
+
+	UpdateSavedFilePath(path string)
+
+	RestoreFromSnapshot(*internal.ProcessSnapshot) error
+
+	GetId() string
+	GetUrl() string
+}