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1
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""" |
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2
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Instantiate a new node and its child nodes from a node type. |
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3
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""" |
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4
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5
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6
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1 |
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from opcua import Node |
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7
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1 |
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from opcua import ua |
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8
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1 |
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from opcua.common import ua_utils |
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9
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1 |
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from opcua.common.copy_node import _rdesc_from_node, _read_and_copy_attrs |
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10
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11
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12
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1 |
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def instantiate(parent, node_type, nodeid=None, bname=None, idx=0): |
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13
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""" |
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14
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instantiate a node type under a parent node. |
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15
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nodeid and browse name of new node can be specified, or just namespace index |
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16
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If they exists children of the node type, such as components, variables and |
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17
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properties are also instantiated |
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18
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""" |
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19
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1 |
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rdesc = _rdesc_from_node(parent, node_type) |
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20
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1 |
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rdesc.TypeDefinition = node_type.nodeid |
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21
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22
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1 |
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if nodeid is None: |
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23
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1 |
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nodeid = ua.NodeId(namespaceidx=idx) # will trigger automatic node generation in namespace idx |
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24
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1 |
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if bname is None: |
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25
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bname = rdesc.BrowseName |
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26
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1 |
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elif isinstance(bname, str): |
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27
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1 |
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bname = ua.QualifiedName.from_string(bname) |
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28
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29
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1 |
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nodeids = _instantiate_node(parent.server, parent.nodeid, rdesc, nodeid, bname) |
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30
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1 |
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return [Node(parent.server, nid) for nid in nodeids] |
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31
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32
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33
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1 |
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def _instantiate_node(server, parentid, rdesc, nodeid, bname, recursive=True): |
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34
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""" |
|
35
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instantiate a node type under parent |
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36
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""" |
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37
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1 |
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node_type = Node(server, rdesc.NodeId) |
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38
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1 |
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refs = node_type.get_referenced_nodes(refs=ua.ObjectIds.HasModellingRule) |
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39
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40
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# skip optional elements |
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41
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1 |
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if len(refs) == 1 and refs[0].nodeid == ua.NodeId(ua.ObjectIds.ModellingRule_Optional): |
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42
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return [] |
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43
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44
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1 |
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addnode = ua.AddNodesItem() |
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45
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1 |
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addnode.RequestedNewNodeId = nodeid |
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46
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1 |
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addnode.BrowseName = bname |
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47
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1 |
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addnode.ParentNodeId = parentid |
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48
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1 |
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addnode.ReferenceTypeId = rdesc.ReferenceTypeId |
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49
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1 |
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addnode.TypeDefinition = rdesc.TypeDefinition |
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50
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51
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1 |
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if rdesc.NodeClass in (ua.NodeClass.Object, ua.NodeClass.ObjectType): |
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52
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1 |
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addnode.NodeClass = ua.NodeClass.Object |
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53
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1 |
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_read_and_copy_attrs(node_type, ua.ObjectAttributes(), addnode) |
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54
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55
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1 |
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elif rdesc.NodeClass in (ua.NodeClass.Variable, ua.NodeClass.VariableType): |
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56
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1 |
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addnode.NodeClass = ua.NodeClass.Variable |
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57
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1 |
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_read_and_copy_attrs(node_type, ua.VariableAttributes(), addnode) |
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58
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elif rdesc.NodeClass in (ua.NodeClass.Method,): |
|
59
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addnode.NodeClass = ua.NodeClass.Method |
|
60
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_read_and_copy_attrs(node_type, ua.MethodAttributes(), addnode) |
|
61
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else: |
|
62
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print("Instantiate: Node class not supported: ", rdesc.NodeClass) |
|
63
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return |
|
64
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|
65
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1 |
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res = server.add_nodes([addnode])[0] |
|
66
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1 |
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added_nodes = [res.AddedNodeId] |
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67
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|
68
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1 |
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if recursive: |
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69
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1 |
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parents = ua_utils.get_node_supertypes(node_type, includeitself=True) |
|
70
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1 |
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node = Node(server, res.AddedNodeId) |
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71
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1 |
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for parent in parents: |
|
72
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1 |
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descs = parent.get_children_descriptions(includesubtypes=False) |
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73
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1 |
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for c_rdesc in descs: |
|
74
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# skip items that already exists, prefer the 'lowest' one in object hierarchy |
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75
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1 |
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if not ua_utils.is_child_present(node, c_rdesc.BrowseName): |
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76
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# if root node being instantiated has a String NodeId, create the children with a String NodeId |
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77
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1 |
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if res.AddedNodeId.NodeIdType is ua.NodeIdType.String: |
|
78
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1 |
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inst_nodeid = res.AddedNodeId.Identifier + "." + c_rdesc.BrowseName.Name |
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79
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1 |
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nodeids = _instantiate_node(server, res.AddedNodeId, c_rdesc, nodeid=ua.NodeId(identifier=inst_nodeid, namespaceidx=res.AddedNodeId.NamespaceIndex), bname=c_rdesc.BrowseName) |
|
80
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else: |
|
81
|
1 |
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nodeids = _instantiate_node(server, res.AddedNodeId, c_rdesc, nodeid=ua.NodeId(namespaceidx=res.AddedNodeId.NamespaceIndex), bname=c_rdesc.BrowseName) |
|
82
|
1 |
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added_nodes.extend(nodeids) |
|
83
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|
84
|
1 |
|
return added_nodes |
|
85
|
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|
86
|
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|
87
|
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|
FreeOpcUa /
python-opcua
