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1
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""" |
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2
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Usefull method and classes not belonging anywhere and depending on opcua library |
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3
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""" |
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4
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5
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from dateutil import parser |
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6
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from datetime import datetime |
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7
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from enum import Enum, IntEnum |
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8
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9
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from opcua import ua |
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10
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from opcua.common.uaerrors import UaError |
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11
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12
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13
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def val_to_string(val): |
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14
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""" |
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15
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convert a python object or python-opcua object to a string |
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16
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which should be easy to understand for human |
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17
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easy to modify, and not too hard to parse back ....not easy |
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18
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meant for UI or command lines |
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19
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20
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""" |
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21
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if isinstance(val, (list, tuple)): |
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22
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res = [] |
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23
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for v in val: |
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24
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res.append(val_to_string(v)) |
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25
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return "[" + ", ".join(res) + "]" |
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26
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27
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if hasattr(val, "to_string"): |
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28
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val = val.to_string() |
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29
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elif isinstance(val, ua.StatusCode): |
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30
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val = val.name |
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31
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elif isinstance(val, (Enum, IntEnum)): |
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32
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val = val.name |
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33
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elif isinstance(val, ua.DataValue): |
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34
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val = variant_to_string(val.Value) |
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35
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elif isinstance(val, str): |
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36
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pass |
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37
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elif isinstance(val, bytes): |
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38
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val = str(val) |
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39
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elif isinstance(val, datetime): |
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40
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val = val.isoformat() |
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41
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elif isinstance(val, (int, float)): |
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42
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val = str(val) |
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43
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else: |
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44
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# FIXME: Some types are probably missing! |
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45
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val = str(val) |
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46
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return val |
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47
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48
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49
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def variant_to_string(var): |
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50
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""" |
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51
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convert a variant to a string which should be easy to understand for human |
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52
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easy to modify, and not too hard to parse back ....not easy |
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53
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meant for UI or command lines |
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54
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""" |
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55
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return val_to_string(var.Value) |
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56
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57
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58
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def string_to_val(string, vtype): |
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59
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""" |
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60
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Convert back a string to a python or python-opcua object |
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61
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""" |
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62
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string = string.strip() |
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63
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if string.startswith("["): |
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64
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string = string[1:-1] |
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65
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var = [] |
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66
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for s in string.split(","): |
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67
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s = s.strip() |
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68
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val = string_to_val(s, vtype) |
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69
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var.append(val) |
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70
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return var |
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71
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72
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if vtype == ua.VariantType.Null: |
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73
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val = None |
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74
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elif vtype == ua.VariantType.Boolean: |
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75
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val = bool(string) |
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76
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elif 4 <= vtype.value < 9: |
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77
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val = int(string) |
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78
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elif vtype in (ua.VariantType.Float, ua.VariantType.Double): |
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79
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val = float(string) |
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80
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elif vtype in (ua.VariantType.String, ua.VariantType.XmlElement): |
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81
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val = string |
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82
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elif vtype in (ua.VariantType.SByte, ua.VariantType.Guid, ua.VariantType.ByteString): |
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83
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val = bytes(string) |
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84
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elif vtype in (ua.VariantType.NodeId, ua.VariantType.ExpandedNodeId): |
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85
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val = ua.NodeId.from_string(string) |
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86
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elif vtype == ua.VariantType.QualifiedName: |
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87
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val = ua.QualifiedName.from_string(string) |
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88
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elif vtype == ua.VariantType.DateTime: |
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89
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val = parser.parse(string) |
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90
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elif vtype == ua.VariantType.LocalizedText: |
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91
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val = ua.LocalizedText(string) |
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92
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elif vtype == ua.VariantType.StatusCode: |
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93
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val = ua.StatusCode(string) |
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94
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else: |
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95
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# FIXME: Some types are probably missing! |
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96
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raise NotImplementedError |
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97
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return val |
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98
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99
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100
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def string_to_variant(string, vtype): |
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101
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""" |
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102
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convert back a string to an ua.Variant |
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103
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""" |
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104
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return ua.Variant(string_to_val(string, vtype), vtype) |
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105
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106
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107
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def get_node_children(node, nodes=None): |
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108
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""" |
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109
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Get recursively all children of a node |
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110
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""" |
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111
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if nodes is None: |
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112
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nodes = [node] |
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113
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for child in node.get_children(): |
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114
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nodes.append(child) |
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115
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get_node_children(child, nodes) |
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116
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return nodes |
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117
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118
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119
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def get_node_subtypes(node, nodes=None): |
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120
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if nodes is None: |
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121
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nodes = [node] |
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122
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for child in node.get_children(refs=ua.ObjectIds.HasSubtype): |
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123
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nodes.append(child) |
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124
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get_node_subtypes(child, nodes) |
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125
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return nodes |
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126
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127
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128
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def get_node_supertypes(node, includeitself = False, skipbase = True): |
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129
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""" |
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130
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return get all subtype parents of node recursive |
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131
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:param server: used in case node is nodeid |
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132
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:param node: can be a ua.Node or ua.NodeId |
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133
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:param includeitself: include also node to the list |
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134
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:param skipbase don't include the toplevel one |
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135
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:returns list of ua.Node, top parent first |
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136
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""" |
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137
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parents =[] |
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138
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if includeitself: |
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139
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parents.append(node) |
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140
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parents.extend(_get_node_supertypes(node)) |
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141
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if skipbase and len(parents) > 1: |
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142
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parents = parents [:-1] |
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143
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144
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return parents |
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145
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146
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147
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def _get_node_supertypes(node): |
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148
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""" |
|
149
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recursive implementation of get_node_derived_from_types |
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150
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""" |
|
151
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basetypes = [] |
|
152
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parents = node.get_referenced_nodes(refs=ua.ObjectIds.HasSubtype, direction=ua.BrowseDirection.Inverse, includesubtypes=True) |
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153
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if len(parents) != 0: |
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154
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#TODO: Is it possible to have multiple subtypes ? If so extended support for it |
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155
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basetypes.append(parents[0]) |
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156
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basetypes.extend( _get_node_supertypes(parents[0]) ) |
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157
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158
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return basetypes |
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159
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160
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def is_child_present(node, browsename): |
|
161
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""" |
|
162
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return if a browsename is present a child from the provide node |
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163
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:param node: node wherein to find the browsename |
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164
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:param browsename: browsename to search |
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165
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:returns returne True if the browsename is present else False |
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166
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""" |
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167
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child_descs = node.get_children_descriptions() |
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168
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for child_desc in child_descs: |
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169
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if child_desc.BrowseName == browsename: |
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170
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return True |
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171
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172
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return False |
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173
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FreeOpcUa /
python-opcua
