.

go/zodb/storage/demo/demo.go

@@ -19,6 +19,9 @@
 
 // Package demo provides overlayed storage, similar to DemoStorage in ZODB/py.
 //
+// Storage combines base and δ storages as if δ transactional log was logically
+// appended to base.
+//
 // XXX
 // XXX link to DemoStorage
 package demo
@@ -59,8 +62,12 @@ func (d *Storage) Close() error {
 }
 
 // Sync implements zodb.IStorageDriver .
-func (d *Storage) Sync(ctx context.Context) (head zodb.Tid, _ error) {
-	// XXX errctx?
+func (d *Storage) Sync(ctx context.Context) (head zodb.Tid, err error) {
+	defer func() {
+		if err != nil {
+			err = &zodb.OpError{URL: d.URL(), Op: "sync", Args: xid, Err: err}
+		}
+	}()
 
 	head, err := d.δ.Sync(ctx)
 	if err != nil {
@@ -136,8 +143,7 @@ func (d *Storage) Load(ctx context.Context, xid zodb.Xid) (_ *mem.Buf, _ zodb.Ti
 
 // Iterator implements zodb.IStorageDriver .
 func (d *Storage) Iterate(ctx context.Context, tidMin, tidMax zodb.Tid) zodb.ITxnIterator {
-	// XXX errctx?
-	panic("TODO") // XXX
+	panic("TODO")
 }
 
 // URL implements zodb.IStorageDriver .