X wcfs, lib/zodb: DemoStorage support

lib/zodb.py

+# -*- coding: utf-8 -*-
 # Wendelin.bigfile | common ZODB-related helpers
 # Copyright (C) 2014-2021  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
@@ -21,6 +22,7 @@
 
 import ZODB
 from ZODB.FileStorage import FileStorage
+from ZODB.DemoStorage import DemoStorage
 from ZODB import DB
 from ZODB import POSException
 from ZODB.utils import p64, u64
@@ -306,6 +308,10 @@ def zstor_2zurl(zstor):
     if isinstance(zstor, FileStorage):
         return "file://%s" % (zstor._file_name,)
 
+    if isinstance(zstor, DemoStorage):
+        # demo:(base_zurl)/(δ_zurl)
+        return "demo:(%s)/(%s)" % (zstor_2zurl(zstor.base), zstor_2zurl(zstor.changes))
+
     ztype = type(zstor).__module__ + "." + type(zstor).__name__
 
     # ZEO

wcfs/go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/pkg/errors v0.9.1
 	github.com/stretchr/testify v1.7.0
 	lab.nexedi.com/kirr/go123 v0.0.0-20210302025843-863c4602a230
-	lab.nexedi.com/kirr/neo/go v0.0.0-20210322184934-2888bbbcbe4b
+	lab.nexedi.com/kirr/neo/go v0.0.0-20210326102715-dc35035cdc18
 )
 
 // we use kirr/go-fuse@y/nodefs-cancel

wcfs/go.sum

@@ -189,3 +189,5 @@ lab.nexedi.com/kirr/go123 v0.0.0-20210302025843-863c4602a230 h1:Ca6y0vXtxL2ncrg6
 lab.nexedi.com/kirr/go123 v0.0.0-20210302025843-863c4602a230/go.mod h1:pwDpdCuvtz0QxisDzV/z9eUb9zc/rMQec520h4i8VWQ=
 lab.nexedi.com/kirr/neo/go v0.0.0-20210322184934-2888bbbcbe4b h1:JmC5mk3Mts39k6llztsx28tSAOarUoghcpCgNleBGro=
 lab.nexedi.com/kirr/neo/go v0.0.0-20210322184934-2888bbbcbe4b/go.mod h1:llI3hcJJMACe+rYuXUfS5dljjwIrlBMfJ1ZeRcey96A=
+lab.nexedi.com/kirr/neo/go v0.0.0-20210326102715-dc35035cdc18 h1:ysqIq6WqSMhCPbSRt3RnI1geV+chVkneXV7Wxn9zsEc=
+lab.nexedi.com/kirr/neo/go v0.0.0-20210326102715-dc35035cdc18/go.mod h1:llI3hcJJMACe+rYuXUfS5dljjwIrlBMfJ1ZeRcey96A=