.

go/zodb/storage/demo/demo_test.go

@@ -44,6 +44,34 @@ func withDemoStorage(t *testing.T, f func(t *testing.T, dsrv *Storage/*XXX -> Sr
 		opt = optv[0]
 	}
 
+	// retrive zdump of Preload
+	zdump := ""
+	if opt.Preload != "" {
+		ctx := context.Background()
+		buf := bytes.Buffer{}
+		stor, _, err := fs1.Open(ctx, opt.Preload, &zodb.DriverOptions{ReadOnly: true}); X(err)
+		err = zodbtools.Dump(ctx, buf, stor, 0, zodb.TidMax, /*hashonly=*/false)
+		stor.Close()
+		X(err)
+		zdump = buf.String()
+	}
+
+	// split zdump into transactions
+	// TODO -> zodbtools.DumpReader
+	txnRe := regexp.MustCompile(`^txn (?P<tid>[0-9a-f]{16}) "(?P<status>.)"$`)
+	type zdumpTxn struct {
+		tid zodb.Tid
+		pos int      // where this transaction starts in the dump
+	}
+	var txnv []zdumpTxn
+	for _, m := range txnRe.FindAllStringSubmatchIndex(zdump, -1) {
+		// [m[0]:m[1]] refer to whole txn line
+		__ := zdump[m[2]:m[3]]
+		tid, err := zodb.ParseTid(__); X(err)
+		txnv = append(txnv, zdumpTxn{tid, m[0])
+	}
+
+
 	// verify on all combinations of preload being split into base+δ 
 	txnv, err := xtesting.LoadDBHistory(opt.Preload); X(err)