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""" |
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2
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Instanciate a node from a node type. |
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Can also be used to duplicate a node tree |
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""" |
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1 |
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from opcua import Node |
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1 |
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from opcua import ua |
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10
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11
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1 |
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class _ReadAdder(object): |
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""" |
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Internal |
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""" |
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1 |
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def __init__(self, server, nodeid): |
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self.server = server |
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self.nodeid = nodeid |
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self.params = ua.ReadParameters() |
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19
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self._debug_attr = [] |
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21
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1 |
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def add(self, attr): |
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rv = ua.ReadValueId() |
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rv.NodeId = self.nodeid |
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rv.AttributeId = attr |
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self.params.NodesToRead.append(rv) |
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self._debug_attr.append(attr) |
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28
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1 |
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def read(self): |
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vals = self.server.read(self.params) |
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30
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new_vals = [] |
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31
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for idx, val in enumerate(vals): |
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32
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if not val.StatusCode.is_good(): |
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print(val) |
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print("Error attribute %s is not valid for node %s" % ( self._debug_attr[idx], self.nodeid)) |
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35
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#val.StatusCode.check() |
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36
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new_vals.append(val.Value.Value) |
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37
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return new_vals |
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38
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39
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40
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#def _read_attributed(server, nodeid, attrs_obj, *attrs): |
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#ra = _ReadAdder(server, rdesc.NodeId) |
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#for attr in attrs: |
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#ra.add(atttr) |
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44
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#vals = ra.read() |
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46
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1 |
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def instanciate_node(parent, node_type, idx): |
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47
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""" |
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48
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Instanciate a new node under 'parent' using a type |
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49
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""" |
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50
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51
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results = node_type.get_attributes([ua.AttributeIds.NodeClass, ua.AttributeIds.BrowseName, ua.AttributeIds.DisplayName]) |
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52
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nclass, bname, dname = [res.Value.Value for res in results] |
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53
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54
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#descs = node_type.get_children_descriptions(refs=ua.ObjectIds.HasTypeDefinition) |
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55
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typedef = ua.FourByteNodeId(ua.ObjectIds.BaseObjectType) |
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56
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#if len(descs) > 1: |
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57
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#print("DESCS", descs) |
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58
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#typedef = descs[0].TypeDefinition |
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59
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60
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rdesc = ua.ReferenceDescription() |
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61
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rdesc.NodeId = node_type.nodeid |
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62
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rdesc.BrowseName = bname |
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63
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rdesc.DisplayName = dname |
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64
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rdesc.NodeClass = nclass |
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65
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rdesc.ReferenceTypeId = ua.TwoByteNodeId(ua.ObjectIds.HasComponent) |
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66
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rdesc.TypeDefinition = typedef |
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67
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print("MYRDESC", rdesc) |
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68
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69
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return _instanciate_node(parent.server, parent.nodeid, rdesc, idx) |
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70
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71
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72
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1 |
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def _instanciate_node(server, parentid, rdesc, idx): |
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73
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""" |
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74
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Instanciate a new node under 'parent' using a type |
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75
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""" |
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76
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77
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print("Instanciating: node %s in %s" % (rdesc, parentid)) |
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78
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addnode = ua.AddNodesItem() |
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79
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addnode.RequestedNewNodeId = ua.generate_nodeid(idx) |
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80
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addnode.BrowseName = rdesc.BrowseName |
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81
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addnode.NodeClass = rdesc.NodeClass |
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addnode.ParentNodeId = parentid |
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83
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addnode.ReferenceTypeId = ua.TwoByteNodeId(ua.ObjectIds.HasComponent) |
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84
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addnode.TypeDefinition = rdesc.TypeDefinition |
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print("ADDNODE", addnode) |
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86
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87
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node_type = Node(server, rdesc.NodeId) |
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88
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89
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if rdesc.NodeClass in (ua.NodeClass.Object, ua.NodeClass.ObjectType): |
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90
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print(node_type, " is object") |
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91
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_read_and_copy_attrs(node_type, ua.ObjectAttributes(), addnode) |
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92
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#_add_object_attrs(addnode, rdesc, node_type) |
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93
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94
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elif rdesc.NodeClass in (ua.NodeClass.Variable, ua.NodeClass.VariableType): |
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95
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print(node_type, " is variable") |
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96
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_read_and_copy_attrs(node_type, ua.VariableAttributes(), addnode) |
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97
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#_add_variable_attrs(addnode, rdesc, node_type) |
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98
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99
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else: |
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100
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print("Node class not supported: ", rdesc.NodeClass) |
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101
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102
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print("ADDNODE FINAL ", addnode) |
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103
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server.add_nodes([addnode]) |
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104
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105
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refs = [] |
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106
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ref = ua.AddReferencesItem() |
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107
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ref.IsForward = True |
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108
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ref.ReferenceTypeId = addnode.ReferenceTypeId |
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109
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ref.SourceNodeId = parentid |
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110
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ref.TargetNodeClass = addnode.NodeClass |
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111
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ref.TargetNodeId = addnode.RequestedNewNodeId |
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112
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113
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refs.append(ref) |
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114
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server.add_references(refs) |
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115
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116
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descs = node_type.get_children_descriptions(includesubtypes=False) #FIXME: should be false |
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117
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print("node is", rdesc.NodeId, node_type, node_type.get_children()) |
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118
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print("Children are: ", descs) |
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119
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for rdesc in descs: |
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120
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_instanciate_node(server, addnode.RequestedNewNodeId, rdesc, idx) |
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121
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return Node(server, addnode.RequestedNewNodeId) |
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122
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123
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124
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1 |
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def _add_object_attrs(addnode, node_type): |
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125
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results = node_type.get_attributes([ |
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126
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ua.AttributeIds.BrowseName, |
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127
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ua.AttributeIds.Description, |
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128
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ua.AttributeIds.WriteMask, |
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129
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ua.AttributeIds.UserWriteMask, |
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130
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ua.AttributeIds.EventNotifier]) |
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131
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132
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attrs = ua.ObjectAttributes() |
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133
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_set_attr(attrs.DisplayName, results, 0) |
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134
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_set_attr(attrs.Description, results, 0) |
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135
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attrs.DisplayName = rdesc.BrowseName |
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136
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attrs.Description = rdesc.Description |
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137
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if results[0].StatusCode.is_good(): |
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138
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attrs.Description = results[0].Value.Value |
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139
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if results[1].StatusCode.is_good(): |
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140
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attrs.WriteMask = results[1].Value.Value |
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141
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if results[2].StatusCode.is_good(): |
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142
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attrs.UserWriteMask = results[2].Value.Value |
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143
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if results[3].StatusCode.is_good(): |
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144
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attrs.UserWriteMask = results[3].Value.Value |
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145
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146
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addnode.NodeAttributes = attrs |
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147
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148
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149
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1 |
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def _read_and_copy_attrs(node_type, struct, addnode): |
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150
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names = [name for name in struct.__dict__.keys() if not name.startswith("_") and name not in ("BodyLength", "TypeId", "SpecifiedAttributes", "Encoding")] |
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151
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attrs = [getattr(ua.AttributeIds, name) for name in names] |
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152
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print("Names are ", names) |
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153
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for name in names: |
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154
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results = node_type.get_attributes(attrs) |
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155
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for idx, name in enumerate(names): |
|
156
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if results[idx].StatusCode.is_good(): |
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157
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if name == "Value": |
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158
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setattr(struct, name, results[idx].Value) |
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159
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else: |
|
160
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setattr(struct, name, results[idx].Value.Value) |
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161
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else: |
|
162
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print("!!!!!!!!!!!!Error, for nodeid %s, attribute %s, statuscode is %s" % (node_type, name, results[idx].StatusCode)) |
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163
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print("struct is ", struct) |
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164
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addnode.NodeAttributes = struct |
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165
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166
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167
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1 |
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def _add_variable_attrs(addnode, rdesc, node_type): |
|
168
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results = node_type.get_attributes([ |
|
169
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ua.AttributeIds.EventNotifier, |
|
170
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ua.AttributeIds.Description, |
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171
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ua.AttributeIds.WriteMask, |
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172
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ua.AttributeIds.UserWriteMask, |
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173
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ua.AttributeIds.Value, |
|
174
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ua.AttributeIds.DataType, |
|
175
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ua.AttributeIds.ValueRank, |
|
176
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ua.AttributeIds.ArrayDimentions, |
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177
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ua.AttributeIds.AccessLevel, |
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178
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ua.AttributeIds.UserAccessLevel, |
|
179
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ua.AttributeIds.MinimumSamplingInterval, |
|
180
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ua.AttributeIds.Historizing]) |
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181
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|
182
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attrs = ua.ObjectAttributes() |
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183
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if results[0].is_good(): |
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184
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attrs.DisplayName = results[0].Value.Value |
|
185
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if results[1].is_good(): |
|
186
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attrs.Description = results[1].Value.Value |
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187
|
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if results[2].is_good(): |
|
188
|
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attrs.WriteMask = results[2].Value.Value |
|
189
|
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if results[3].is_good(): |
|
190
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attrs.UserWriteMask = results[3].Value.Value |
|
191
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#if results[4].is_good(): |
|
192
|
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#attrs.Value = results[4].Value.Value |
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193
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if results[5].is_good(): |
|
194
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attrs.DataType = results[5].Value.Value |
|
195
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if results[6].is_good(): |
|
196
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attrs.ValueRank = results[6].Value.Value |
|
197
|
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if results[7].is_good(): |
|
198
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attrs.ArrayDimensions = results[7].Value.Value |
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199
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if results[8].is_good(): |
|
200
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attrs.AccessLevel = results[8].Value.Value |
|
201
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if results[9].is_good(): |
|
202
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attrs.UserAccessLevel = results[9].Value.Value |
|
203
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if results[10].is_good(): |
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204
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attrs.MinimumSamplingInterval = results[10].Value.Value |
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205
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if results[11].is_good(): |
|
206
|
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attrs.Historizing = results[11].Value.Value |
|
207
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|
208
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addnode.NodeAttributes = attrs |
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209
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210
|
1 |
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def _set_attr(container, result, idx): |
|
211
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if result.is_good(): |
|
212
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container = result.Value.Value |
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213
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214
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215
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FreeOpcUa /
python-opcua
