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""" |
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instantiate 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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7
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from opcua import Node |
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from opcua import ua |
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11
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class _ReadAdder(object): |
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""" |
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Internal |
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""" |
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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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self._debug_attr = [] |
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22
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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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29
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def read(self): |
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vals = self.server.read(self.params) |
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31
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new_vals = [] |
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32
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for idx, val in enumerate(vals): |
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33
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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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# val.StatusCode.check() |
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new_vals.append(val.Value.Value) |
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return new_vals |
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40
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41
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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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#vals = ra.read() |
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47
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def instantiate(parent, node_type, nodeid=None, bname=None, idx=0): |
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48
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""" |
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49
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instantiate a node type under a parent node. |
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50
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nodeid and browse name of new node can be specified, or just namespace index |
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51
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""" |
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52
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53
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results = node_type.get_attributes([ua.AttributeIds.NodeClass, ua.AttributeIds.BrowseName, ua.AttributeIds.DisplayName]) |
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54
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nclass, qname, dname = [res.Value.Value for res in results] |
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55
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56
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rdesc = ua.ReferenceDescription() |
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57
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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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rdesc.ReferenceTypeId = ua.TwoByteNodeId(ua.ObjectIds.HasComponent) |
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62
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rdesc.TypeDefinition = node_type.nodeid |
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63
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print("MYRDESC", rdesc) |
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if nodeid is None: |
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nodeid = ua.NodeId(namespaceidx=idx) # will trigger automtic 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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70
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71
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return _instantiate_node(parent.server, parent.nodeid, rdesc, nodeid, bname) |
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72
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73
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74
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def _instantiate_node(server, parentid, rdesc, nodeid, bname, recursive=True): |
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""" |
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76
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instantiate a node type under parent |
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77
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""" |
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78
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79
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print("\n\nInstanciating: node %s in %s" % (nodeid, parentid)) |
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80
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print(rdesc) |
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81
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addnode = ua.AddNodesItem() |
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addnode.RequestedNewNodeId = nodeid |
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addnode.BrowseName = bname |
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addnode.ParentNodeId = parentid |
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addnode.ReferenceTypeId = rdesc.ReferenceTypeId |
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86
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addnode.TypeDefinition = rdesc.TypeDefinition |
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#print("ADDNODE", addnode) |
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89
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node_type = Node(server, rdesc.NodeId) |
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90
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91
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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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93
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print(node_type, " is object", rdesc.NodeClass) |
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94
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_read_and_copy_attrs(node_type, ua.ObjectAttributes(), addnode) |
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95
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96
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elif rdesc.NodeClass in (ua.NodeClass.Variable, ua.NodeClass.VariableType): |
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97
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addnode.NodeClass = ua.NodeClass.Variable |
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98
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print(node_type, " is variable", rdesc.NodeClass) |
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99
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_read_and_copy_attrs(node_type, ua.VariableAttributes(), addnode) |
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100
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101
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else: |
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102
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print("Node class not supported: ", rdesc.NodeClass) |
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103
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104
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#print("ADDNODE FINAL ", addnode) |
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105
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res = server.add_nodes([addnode])[0] |
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106
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print("RES", res) |
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107
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108
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#refs = [] |
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109
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#ref = ua.AddReferencesItem() |
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110
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#ref.IsForward = True |
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111
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#ref.ReferenceTypeId = addnode.ReferenceTypeId |
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112
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#ref.SourceNodeId = parentid |
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113
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#ref.TargetNodeClass = addnode.NodeClass |
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114
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#ref.TargetNodeId = res.AddedNodeId |
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115
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116
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#refs.append(ref) |
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117
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#server.add_references(refs) |
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118
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119
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if recursive: |
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120
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descs = node_type.get_children_descriptions(includesubtypes=False) |
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121
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for c_rdesc in descs: |
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122
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print(" Instanciating children", c_rdesc) |
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123
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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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124
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return Node(server, addnode.RequestedNewNodeId) |
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125
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126
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127
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def _add_object_attrs(addnode, rdesc, node_type): |
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128
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results = node_type.get_attributes([ |
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129
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ua.AttributeIds.BrowseName, |
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130
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ua.AttributeIds.Description, |
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131
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ua.AttributeIds.WriteMask, |
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132
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ua.AttributeIds.UserWriteMask, |
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133
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ua.AttributeIds.EventNotifier]) |
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134
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135
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attrs = ua.ObjectAttributes() |
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136
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_set_attr(attrs.DisplayName, results, 0) |
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137
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_set_attr(attrs.Description, results, 0) |
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138
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attrs.DisplayName = rdesc.BrowseName |
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139
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attrs.Description = rdesc.Description |
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140
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if results[0].StatusCode.is_good(): |
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141
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attrs.Description = results[0].Value.Value |
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142
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if results[1].StatusCode.is_good(): |
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143
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attrs.WriteMask = results[1].Value.Value |
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144
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if results[2].StatusCode.is_good(): |
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145
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attrs.UserWriteMask = results[2].Value.Value |
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146
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if results[3].StatusCode.is_good(): |
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147
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attrs.UserWriteMask = results[3].Value.Value |
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148
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149
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addnode.NodeAttributes = attrs |
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150
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151
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152
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def _read_and_copy_attrs(node_type, struct, addnode): |
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153
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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")] |
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154
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attrs = [getattr(ua.AttributeIds, name) for name in names] |
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155
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#print("Names are ", names) |
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156
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for name in names: |
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157
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results = node_type.get_attributes(attrs) |
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158
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for idx, name in enumerate(names): |
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159
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if results[idx].StatusCode.is_good(): |
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160
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if name == "Value": |
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161
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setattr(struct, name, results[idx].Value) |
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162
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else: |
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163
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setattr(struct, name, results[idx].Value.Value) |
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164
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else: |
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165
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print("!!!!!!!!!!!!Error, for nodeid %s, attribute %s, statuscode is %s" % (node_type, name, results[idx].StatusCode)) |
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166
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#print("struct is ", struct) |
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167
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addnode.NodeAttributes = struct |
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168
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169
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170
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def _add_variable_attrs(addnode, rdesc, node_type): |
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171
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results = node_type.get_attributes([ |
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172
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ua.AttributeIds.EventNotifier, |
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173
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ua.AttributeIds.Description, |
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174
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ua.AttributeIds.WriteMask, |
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175
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ua.AttributeIds.UserWriteMask, |
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176
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ua.AttributeIds.Value, |
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177
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ua.AttributeIds.DataType, |
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178
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ua.AttributeIds.ValueRank, |
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179
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ua.AttributeIds.ArrayDimensions, |
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180
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ua.AttributeIds.AccessLevel, |
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181
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ua.AttributeIds.UserAccessLevel, |
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182
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ua.AttributeIds.MinimumSamplingInterval, |
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183
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ua.AttributeIds.Historizing]) |
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184
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|
185
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attrs = ua.ObjectAttributes() |
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186
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if results[0].is_good(): |
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187
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attrs.DisplayName = results[0].Value.Value |
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188
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if results[1].is_good(): |
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189
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attrs.Description = results[1].Value.Value |
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190
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if results[2].is_good(): |
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191
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attrs.WriteMask = results[2].Value.Value |
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192
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if results[3].is_good(): |
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193
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attrs.UserWriteMask = results[3].Value.Value |
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194
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# if results[4].is_good(): |
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195
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#attrs.Value = results[4].Value.Value |
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196
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if results[5].is_good(): |
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197
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attrs.DataType = results[5].Value.Value |
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198
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if results[6].is_good(): |
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199
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attrs.ValueRank = results[6].Value.Value |
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200
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if results[7].is_good(): |
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201
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attrs.ArrayDimensions = results[7].Value.Value |
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202
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if results[8].is_good(): |
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203
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attrs.AccessLevel = results[8].Value.Value |
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204
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if results[9].is_good(): |
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205
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attrs.UserAccessLevel = results[9].Value.Value |
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206
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if results[10].is_good(): |
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207
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attrs.MinimumSamplingInterval = results[10].Value.Value |
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208
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if results[11].is_good(): |
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209
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attrs.Historizing = results[11].Value.Value |
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210
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|
211
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addnode.NodeAttributes = attrs |
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212
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213
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214
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def _set_attr(container, result, idx): |
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215
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if result.is_good(): |
|
216
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container = result.Value.Value |
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217
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FreeOpcUa /
python-opcua
