add namespace meta data

asyncua/common/xmlimporter.py

@@ -93,6 +93,26 @@ class XmlImporter:
             raise ValueError("Server doesn't satisfy required XML-Models. Import them first!")
         return None
 
+    async def _check_if_namespace_meta_information_is_added(self):
+        """
+        check if the NamespaceMetadata objects in server namespaces exists otherwise add them
+        to prevent errors when other nodesets depend on this namespace.
+        """
+        descs = await self.server.nodes.namespaces.get_children_descriptions()
+        ns_objs = [n.BrowseName.Name for n in descs]
+        for uri, version, pub_date in self.parser.get_nodeset_namespaces():
+            if uri not in ns_objs:
+                idx = await self.server.register_namespace(uri)
+                obj = await self.nodes.namespaces.add_object(idx, uri, ua.ObjectIds.NamespaceMetadataType, False)
+                ns_uri = await obj.get_child('NamespaceUri')
+                await ns_uri.write_value(uri, ua.VariantType.String)
+                ns_ver = await obj.get_child('NamespaceVersion')
+                await ns_ver.write_value(version, ua.VariantType.String)
+                ns_date = await obj.get_child('NamespacePublicationDate')
+                await ns_date.write_value(pub_date)
+                ns_subset = await obj.get_child('IsNamespaceSubset')
+                await ns_subset.write_value(True)
+
     async def import_xml(self, xmlpath=None, xmlstring=None):
         """
         import xml and return added nodes
@@ -131,6 +151,7 @@ class XmlImporter:
                 "The following references could not be imported and are probably broken: %s",
                 self.refs,
             )
+        await self._check_if_namespace_meta_information_is_added()
         return nodes
 
     async def _add_missing_reverse_references(self, new_nodes):

asyncua/common/xmlparser.py

@@ -5,6 +5,7 @@ import re
 import asyncio
 import base64
 import logging
+from typing import List, Tuple
 import xml.etree.ElementTree as ET
 
 from pytz import utc
@@ -439,3 +440,20 @@ class XMLParser:
                 # check if ModelUri X, in Version Y from time Z was already imported
                 required_models.append(child.attrib)
         return required_models
+
+    def get_nodeset_namespaces(self) -> List[Tuple[str, ua.String, ua.DateTime]]:
+        """
+        Get all namespaces that are registered with version and date_time
+        """
+        ns = []
+        for model in self.root.findall('base:Models/base:Model', self.ns):
+            uri = model.attrib.get('ModelUri')
+            if uri is not None:
+                version = model.attrib.get('Version', ua.String())
+                date_time = model.attrib.get('PublicationDate')
+                if date_time is None:
+                    date_time = ua.DateTime(1, 1, 1)
+                else:
+                    date_time = ua.DateTime.strptime(date_time, "%Y-%m-%dT%H:%M:%SZ")
+                ns.append((uri, version, date_time))
+        return ns

tests/test_xml.py

@@ -582,3 +582,17 @@ async def test_disable_xml_export_without_value(opc, tmpdir):
     assert dv.Value != v.Value
     assert v.Value.Value is None
     await opc.opc.delete_nodes([o2])
+
+
+async def test_if_missing_meta_data_is_added(opc):
+    # check if missing namespace infos are added
+    urn = "http://yourorganisation.org/testenum104/"
+    idx = await opc.opc.register_namespace(urn)
+    await opc.opc.import_xml(CUSTOM_REQ_XML_PASS_PATH)
+    o = await opc.opc.nodes.namespaces.get_child([f"{idx}:{urn}"])
+    assert await (await o.get_child("NamespaceUri")).read_value() == urn
+    assert await (await o.get_child("NamespaceVersion")).read_value() == "1.0.0"
+    dt = await (await o.get_child("NamespacePublicationDate")).read_value()
+    assert dt.year == 2020
+    assert dt.month == 8
+    assert dt.day == 11