|
1
|
|
|
|
|
2
|
|
|
from opcua import ua |
|
3
|
|
|
from opcua import Client |
|
4
|
|
|
from opcua import Node |
|
5
|
|
|
|
|
6
|
|
|
|
|
7
|
|
|
class UaClient(object): |
|
8
|
|
|
""" |
|
9
|
|
|
OPC-Ua client specialized for the need of GUI client |
|
10
|
|
|
return exactly whant GUI needs, no customization possible |
|
11
|
|
|
""" |
|
12
|
|
|
|
|
13
|
|
|
def __init__(self): |
|
14
|
|
|
self.client = None |
|
15
|
|
|
self._connected = False |
|
16
|
|
|
self._datachange_sub = None |
|
17
|
|
|
self._event_sub = None |
|
18
|
|
|
self._subs_dc = {} |
|
19
|
|
|
self._subs_ev = {} |
|
20
|
|
|
|
|
21
|
|
|
def get_node(self, nodeid): |
|
22
|
|
|
return self.client.get_node(nodeid) |
|
23
|
|
|
|
|
24
|
|
|
def connect(self, uri): |
|
25
|
|
|
self.disconnect() |
|
26
|
|
|
print("Connecting to ", uri) |
|
27
|
|
|
self.client = Client(uri) |
|
28
|
|
|
self.client.connect() |
|
29
|
|
|
self._connected = True |
|
30
|
|
|
|
|
31
|
|
|
def disconnect(self): |
|
32
|
|
|
if self._connected: |
|
33
|
|
|
print("Disconnecting from server") |
|
34
|
|
|
self._subs_dc = {} |
|
35
|
|
|
self._subs_ev = {} |
|
36
|
|
|
self._connected = False |
|
37
|
|
|
self._subscription = None |
|
38
|
|
|
self.client.disconnect() |
|
39
|
|
|
self.client = None |
|
40
|
|
|
|
|
41
|
|
|
def subscribe_datachange(self, node, handler): |
|
42
|
|
|
if not self._datachange_sub: |
|
43
|
|
|
self._datachange_sub = self.client.create_subscription(500, handler) |
|
44
|
|
|
handle = self._datachange_sub.subscribe_data_change(node) |
|
45
|
|
|
self._subs_dc[node.nodeid] = handle |
|
46
|
|
|
return handle |
|
47
|
|
|
|
|
48
|
|
|
def unsubscribe_datachange(self, node): |
|
49
|
|
|
self._datachange_sub.unsubscribe(self._subs_dc[node.nodeid]) |
|
50
|
|
|
|
|
51
|
|
|
def subscribe_events(self, node, handler): |
|
52
|
|
|
if not self._event_sub: |
|
53
|
|
|
print("subscirbing with handler: ", handler, dir(handler)) |
|
54
|
|
|
self._event_sub = self.client.create_subscription(500, handler) |
|
55
|
|
|
handle = self._event_sub.subscribe_events(node) |
|
56
|
|
|
self._subs_ev[node.nodeid] = handle |
|
57
|
|
|
return handle |
|
58
|
|
|
|
|
59
|
|
|
def unsubscribe_events(self, node): |
|
60
|
|
|
self._event_sub.unsubscribe(self._subs_ev[node.nodeid]) |
|
61
|
|
|
|
|
62
|
|
|
def get_node_attrs(self, node): |
|
63
|
|
|
if not isinstance(node, Node): |
|
64
|
|
|
node = self.client.get_node(node) |
|
65
|
|
|
attrs = node.get_attributes([ua.AttributeIds.DisplayName, ua.AttributeIds.BrowseName, ua.AttributeIds.NodeId]) |
|
66
|
|
|
return node, [attr.Value.Value.to_string() for attr in attrs] |
|
67
|
|
|
|
|
68
|
|
|
def get_children(self, node): |
|
69
|
|
|
descs = node.get_children_descriptions() |
|
70
|
|
|
descs.sort(key=lambda x: x.BrowseName) |
|
71
|
|
|
return descs |
|
72
|
|
|
|
|
73
|
|
|
|
FreeOpcUa /
opcua-client-gui
