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from opcua import ua |
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from opcua.common.node import Node |
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def copy_node(parent, node, nodeid=None, recursive=True): |
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""" |
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Copy a node or node tree as child of parent node |
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""" |
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print("Copying", node, "into ", parent) |
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rdesc = _rdesc_from_node(parent, node) |
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if nodeid is None: |
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nodeid = ua.NodeId(namespaceidx=node.nodeid.NamespaceIndex) |
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added_nodeids = _copy_node(parent.server, parent.nodeid, rdesc, nodeid, recursive) |
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return [Node(parent.server, nid) for nid in added_nodeids] |
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def _copy_node(server, parent_nodeid, rdesc, nodeid, recursive): |
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addnode = ua.AddNodesItem() |
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addnode.RequestedNewNodeId = nodeid |
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addnode.BrowseName = rdesc.BrowseName |
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addnode.ParentNodeId = parent_nodeid |
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addnode.ReferenceTypeId = rdesc.ReferenceTypeId |
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addnode.TypeDefinition = rdesc.TypeDefinition |
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addnode.NodeClass = rdesc.NodeClass |
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node_to_copy = Node(server, rdesc.NodeId) |
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attrObj = getattr(ua, rdesc.NodeClass.name + "Attributes") |
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_read_and_copy_attrs(node_to_copy, attrObj(), addnode) |
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res = server.add_nodes([addnode])[0] |
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added_nodes = [res.AddedNodeId] |
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if recursive: |
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descs = node_to_copy.get_children_descriptions() |
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for desc in descs: |
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nodes = _copy_node(server, res.AddedNodeId, desc, nodeid=ua.NodeId(namespaceidx=desc.NodeId.NamespaceIndex), recursive=True) |
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added_nodes.extend(nodes) |
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return added_nodes |
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def _rdesc_from_node(parent, node): |
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results = node.get_attributes([ua.AttributeIds.NodeClass, ua.AttributeIds.BrowseName, ua.AttributeIds.DisplayName]) |
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nclass, qname, dname = [res.Value.Value for res in results] |
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rdesc = ua.ReferenceDescription() |
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rdesc.NodeId = node.nodeid |
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rdesc.BrowseName = qname |
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rdesc.DisplayName = dname |
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rdesc.NodeClass = nclass |
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if parent.get_type_definition() == ua.NodeId(ua.ObjectIds.FolderType): |
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rdesc.ReferenceTypeId = ua.NodeId(ua.ObjectIds.Organizes) |
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else: |
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rdesc.ReferenceTypeId = ua.NodeId(ua.ObjectIds.HasComponent) |
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typedef = node.get_type_definition() |
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if typedef: |
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rdesc.TypeDefinition = typedef |
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return rdesc |
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def _read_and_copy_attrs(node_type, struct, addnode): |
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names = [name for name in struct.__dict__.keys() if not name.startswith("_") and name not in ("BodyLength", "TypeId", "SpecifiedAttributes", "Encoding", "IsAbstract", "EventNotifier")] |
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attrs = [getattr(ua.AttributeIds, name) for name in names] |
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for name in names: |
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results = node_type.get_attributes(attrs) |
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for idx, name in enumerate(names): |
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if results[idx].StatusCode.is_good(): |
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if name == "Value": |
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setattr(struct, name, results[idx].Value) |
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else: |
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setattr(struct, name, results[idx].Value.Value) |
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else: |
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print("Instantiate: while copying attributes from node type %s, attribute %s, statuscode is %s" % (node_type, name, results[idx].StatusCode)) |
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addnode.NodeAttributes = struct |
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FreeOpcUa /
python-opcua
