1 files changed, 45 insertions, 0 deletions
diff --git a/weed/filer/read_remote.go b/weed/filer/read_remote.go
new file mode 100644
index 000000000..77ca81f15
--- /dev/null
+++ b/weed/filer/read_remote.go
@@ -0,0 +1,45 @@
+package filer
+
+import (
+	"context"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+func (entry *Entry) IsInRemoteOnly() bool {
+	return len(entry.Chunks) == 0 && entry.Remote != nil && entry.Remote.RemoteSize > 0
+}
+
+func (f *Filer) ReadRemote(entry *Entry, offset int64, size int64) (data []byte, err error) {
+	client, _, found := f.RemoteStorage.GetRemoteStorageClient(entry.Remote.StorageName)
+	if !found {
+		return nil, fmt.Errorf("remote storage %v not found", entry.Remote.StorageName)
+	}
+
+	mountDir, remoteLoation := f.RemoteStorage.FindMountDirectory(entry.FullPath)
+
+	sourceLoc := MapFullPathToRemoteStorageLocation(mountDir, remoteLoation, entry.FullPath)
+
+	return client.ReadFile(sourceLoc, offset, size)
+}
+
+func MapFullPathToRemoteStorageLocation(localMountedDir util.FullPath, remoteMountedLocation *filer_pb.RemoteStorageLocation, fp util.FullPath) *filer_pb.RemoteStorageLocation {
+	remoteLocation := &filer_pb.RemoteStorageLocation{
+		Name:   remoteMountedLocation.Name,
+		Bucket: remoteMountedLocation.Bucket,
+		Path:   remoteMountedLocation.Path,
+	}
+	remoteLocation.Path += string(fp)[len(localMountedDir):]
+	return remoteLocation
+}
+
+func DownloadToLocal(filerClient filer_pb.FilerClient, remoteConf *filer_pb.RemoteConf, remoteLocation *filer_pb.RemoteStorageLocation, parent util.FullPath, entry *filer_pb.Entry) error {
+	return filerClient.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+		_, err := client.DownloadToLocal(context.Background(), &filer_pb.DownloadToLocalRequest{
+			Directory: string(parent),
+			Name:      entry.Name,
+		})
+		return err
+	})
+}