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""" |
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Instantiate a new node and its child nodes from a node type. |
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""" |
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from opcua import Node |
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from opcua import ua |
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from opcua.common import ua_utils |
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def instantiate(parent, node_type, nodeid=None, bname=None, idx=0): |
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""" |
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instantiate a node type under a parent node. |
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nodeid and browse name of new node can be specified, or just namespace index |
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If they exists children of the node type, such as components, variables and |
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properties are also instantiated |
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""" |
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results = node_type.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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21
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rdesc = ua.ReferenceDescription() |
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rdesc.NodeId = node_type.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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31
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rdesc.TypeDefinition = node_type.nodeid |
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32
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if nodeid is None: |
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nodeid = ua.NodeId(namespaceidx=idx) # will trigger automatic node generation in namespace idx |
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if bname is None: |
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bname = rdesc.BrowseName |
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elif isinstance(bname, str): |
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bname = ua.QualifiedName.from_string(bname) |
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return _instantiate_node(parent.server, parent.nodeid, rdesc, nodeid, bname) |
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40
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41
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42
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def _instantiate_node(server, parentid, rdesc, nodeid, bname, recursive=True): |
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43
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""" |
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44
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instantiate a node type under parent |
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45
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""" |
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46
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47
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addnode = ua.AddNodesItem() |
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48
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addnode.RequestedNewNodeId = nodeid |
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49
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addnode.BrowseName = bname |
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50
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addnode.ParentNodeId = parentid |
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51
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addnode.ReferenceTypeId = rdesc.ReferenceTypeId |
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52
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addnode.TypeDefinition = rdesc.TypeDefinition |
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53
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54
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node_type = Node(server, rdesc.NodeId) |
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55
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56
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refs = node_type.get_referenced_nodes(refs=ua.ObjectIds.HasModellingRule) |
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57
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# skip optional elements |
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58
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if not(len(refs) == 1 and refs[0].nodeid == ua.NodeId(ua.ObjectIds.ModellingRule_Optional) ): |
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59
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60
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if rdesc.NodeClass in (ua.NodeClass.Object, ua.NodeClass.ObjectType): |
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addnode.NodeClass = ua.NodeClass.Object |
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_read_and_copy_attrs(node_type, ua.ObjectAttributes(), addnode) |
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63
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64
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elif rdesc.NodeClass in (ua.NodeClass.Variable, ua.NodeClass.VariableType): |
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addnode.NodeClass = ua.NodeClass.Variable |
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_read_and_copy_attrs(node_type, ua.VariableAttributes(), addnode) |
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67
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elif rdesc.NodeClass in (ua.NodeClass.Method,): |
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addnode.NodeClass = ua.NodeClass.Method |
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_read_and_copy_attrs(node_type, ua.MethodAttributes(), addnode) |
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70
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else: |
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print("Instantiate: Node class not supported: ", rdesc.NodeClass) |
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72
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return |
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73
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74
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res = server.add_nodes([addnode])[0] |
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75
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76
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if recursive: |
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77
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parents = ua_utils.get_node_supertypes(node_type, includeitself = True) |
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node = Node(server, res.AddedNodeId) |
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for parent in parents: |
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descs = parent.get_children_descriptions(includesubtypes=False) |
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81
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for c_rdesc in descs: |
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82
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# skip items that already exists, prefer the 'lowest' one in object hierarchy |
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83
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if not ua_utils.is_child_present(node, c_rdesc.BrowseName): |
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84
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_instantiate_node(server, res.AddedNodeId, c_rdesc, nodeid=ua.NodeId(namespaceidx=res.AddedNodeId.NamespaceIndex), bname=c_rdesc.BrowseName) |
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85
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86
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return Node(server, res.AddedNodeId) |
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87
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88
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else: |
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89
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return None |
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90
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91
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92
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def _read_and_copy_attrs(node_type, struct, addnode): |
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93
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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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94
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attrs = [getattr(ua.AttributeIds, name) for name in names] |
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95
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for name in names: |
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96
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results = node_type.get_attributes(attrs) |
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97
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for idx, name in enumerate(names): |
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98
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if results[idx].StatusCode.is_good(): |
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99
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if name == "Value": |
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100
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setattr(struct, name, results[idx].Value) |
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101
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else: |
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102
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setattr(struct, name, results[idx].Value.Value) |
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103
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else: |
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104
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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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105
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addnode.NodeAttributes = struct |
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106
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FreeOpcUa /
python-opcua
