Refactored downloader

api/internal/core/services/downloader/downloader.go

@@ -0,0 +1,54 @@
+package downloader
+
+import (
+	"downloader/internal/core/ports/downloadhandler"
+	"downloader/internal/core/ports/fileorchestrator"
+	"errors"
+	"go.uber.org/zap"
+)
+
+type Downloader interface {
+	Download(link string, downloadId string) error
+}
+
+type downloader struct {
+	logger            *zap.SugaredLogger
+	downloadHandler   downloadhandler.DownloadHandler
+	fileOrchestrator  *fileorchestrator.FileOrchestrator
+	ondownloadhandler downloadhandler.OnDownloadEventHandler
+}
+
+func New(
+	logger *zap.SugaredLogger,
+	orchestrator *fileorchestrator.FileOrchestrator,
+	downloadHandler downloadhandler.DownloadHandler,
+	downloadEventHandler downloadhandler.OnDownloadEventHandler,
+) Downloader {
+	return &downloader{
+		logger:            logger,
+		downloadHandler:   downloadHandler,
+		fileOrchestrator:  orchestrator,
+		ondownloadhandler: downloadEventHandler,
+	}
+}
+
+func (y *downloader) Download(link string, downloadId string) error {
+	basePath, err := y.fileOrchestrator.Begin(link)
+	if err != nil {
+		return errors.New("could not prepare for this link")
+	}
+	defer y.fileOrchestrator.CleanUp(basePath)
+
+	y.downloadHandler.OnProgress(y.ondownloadhandler)
+	err = y.downloadHandler.Download(link, basePath, downloadId)
+	if err != nil {
+		return errors.New("could not download file")
+	}
+
+	err = y.fileOrchestrator.Move(basePath)
+	if err != nil {
+		return errors.New("could not move to final destination")
+	}
+
+	return nil
+}