refactoring

weed/storage/needle/needle_write_test.go

@@ -59,7 +59,7 @@ func TestAppend(t *testing.T) {
 	datBackend := backend.NewDiskFile(tempFile)
 	defer datBackend.Close()
 
-	offset, _, _, _ := n.Append(datBackend, CurrentVersion)
+	offset, _, _, _ := n.Append(datBackend, GetCurrentVersion())
 	if offset != uint64(fileSize) {
 		t.Errorf("Fail to Append Needle.")
 	}

weed/storage/needle/volume_version.go

@@ -3,8 +3,11 @@ package needle
 type Version uint8
 
 const (
-	Version1       = Version(1)
-	Version2       = Version(2)
-	Version3       = Version(3)
-	CurrentVersion = Version3
+	Version1 = Version(1)
+	Version2 = Version(2)
+	Version3 = Version(3)
 )
+
+func GetCurrentVersion() Version {
+	return Version3
+}