.

go/zodb/storage/demo/demo.go

@@ -176,6 +176,9 @@ func (d *Storage) Sync(ctx context.Context) (_ zodb.Tid, err error) {
 			err = &zodb.OpError{URL: d.URL(), Op: "sync", Err: err}
 		}
 	}()
+	if ready(d.down) {
+		return zodb.InvalidTid, d.downErr
+	}
 
 	var head zodb.Tid
 	wg := xsync.NewWorkGroup(ctx)
@@ -215,7 +218,6 @@ func (d *Storage) Load(ctx context.Context, xid zodb.Xid) (_ *mem.Buf, _ zodb.Ti
 			err = &zodb.OpError{URL: d.URL(), Op: "load", Args: xid, Err: err}
 		}
 	}()
-
 	if ready(d.down) {
 		return nil, zodb.InvalidTid, d.downErr
 	}
@@ -397,7 +399,7 @@ func init() {
 }
 
 
-// misc
+// ---- misc ----
 
 // ready returns whether c is ready.
 func ready(c <-chan struct{}) bool {