add strict_mode

In non strict_mode most errors are just logged an the import continues.

asyncua/client/client.py

@@ -639,11 +639,11 @@ class Client:
     async def delete_nodes(self, nodes, recursive=False) -> Coroutine:
         return await delete_nodes(self.uaclient, nodes, recursive)
 
-    async def import_xml(self, path=None, xmlstring=None) -> Coroutine:
+    async def import_xml(self, path=None, xmlstring=None, strict_mode=True) -> Coroutine:
         """
         Import nodes defined in xml
         """
-        importer = XmlImporter(self)
+        importer = XmlImporter(self, strict_mode=strict_mode)
         return await importer.import_xml(path, xmlstring)
 
     async def export_xml(self, nodes, path, export_values: bool = False):

asyncua/common/xmlimporter.py

@@ -18,13 +18,19 @@ def _parse_version(version_string: str) -> List[int]:
     return [int(v) for v in version_string.split('.')]
 
 class XmlImporter:
-    def __init__(self, server):
+
+    def __init__(self, server, strict_mode=True):
+        '''
+        strict_mode: stop on a error, if False only a error message is logged,
+                     but the import continues
+        '''
         self.parser = None
         self.server = server
         self.namespaces: Dict[int, int] = {}  # Dict[IndexInXml, IndexInServer]
         self.aliases: Dict[str, ua.NodeId] = {}
         self._unmigrated_aliases: Dict[str, str] = {}  # Dict[name, nodeId string]
         self.refs = None
+        self.strict_mode = strict_mode
 
     async def _map_namespaces(self):
         """
@@ -110,8 +116,10 @@ class XmlImporter:
         for nodedata in nodes_parsed:  # self.parser:
             try:
                 node = await self._add_node_data(nodedata, no_namespace_migration=True)
-            except Exception:
-                _logger.warning("failure adding node %s", nodedata)
+                raise Exception('test')
+            except Exception as e:
+                _logger.warning("failure adding node %s %s", nodedata, e)
+                if self.strict_mode:
                     raise
             nodes.append(node)
         self.refs, remaining_refs = [], self.refs

asyncua/server/server.py

@@ -582,11 +582,11 @@ class Server:
             await custom_t.add_method(idx, method[0], method[1], method[2], method[3])
         return custom_t
 
-    async def import_xml(self, path=None, xmlstring=None) -> Coroutine:
+    async def import_xml(self, path=None, xmlstring=None, strict_mode=True) -> Coroutine:
         """
         Import nodes defined in xml
         """
-        importer = XmlImporter(self)
+        importer = XmlImporter(self, strict_mode)
         return await importer.import_xml(path, xmlstring)
 
     async def export_xml(self, nodes, path, export_values: bool = False):

asyncua/sync.py

@@ -330,7 +330,7 @@ class Server:
         return SyncNode(self.tloop, self.aio_obj.get_node(nodeid))
 
     @syncmethod
-    def import_xml(self, path=None, xmlstring=None):
+    def import_xml(self, path=None, xmlstring=None, strict_mode=True):
         pass
 
     @syncmethod