func downloadFile(writer io.Writer, ptr *Pointer, workingfile, mediafile string, manifest *transfer.Manifest, cb progress.CopyCallback) error {
fmt.Fprintf(os.Stderr, "Downloading %s (%s)\n", workingfile, pb.FormatBytes(ptr.Size))
xfers := manifest.GetDownloadAdapterNames()
obj, adapterName, err := api.BatchOrLegacySingle(config.Config, &api.ObjectResource{Oid: ptr.Oid, Size: ptr.Size}, "download", xfers)
if err != nil {
return errors.Wrapf(err, "Error downloading %s: %s", filepath.Base(mediafile), err)
}
if ptr.Size == 0 {
ptr.Size = obj.Size
}
adapter := manifest.NewDownloadAdapter(adapterName)
var tcb transfer.TransferProgressCallback
if cb != nil {
tcb = func(name string, totalSize, readSoFar int64, readSinceLast int) error {
return cb(totalSize, readSoFar, readSinceLast)
}
}
// Single download
adapterResultChan := make(chan transfer.TransferResult, 1)
err = adapter.Begin(1, tcb, adapterResultChan)
if err != nil {
return err
}
adapter.Add(transfer.NewTransfer(filepath.Base(workingfile), obj, mediafile))
adapter.End()
res := <-adapterResultChan
if res.Error != nil {
return errors.Wrapf(err, "Error buffering media file: %s", res.Error)
}
return readLocalFile(writer, ptr, mediafile, workingfile, nil)
}
