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