|
1
|
|
|
|
|
2
|
1 |
|
from datetime import datetime |
|
3
|
|
|
|
|
4
|
1 |
|
from opcua import ua |
|
5
|
1 |
|
from opcua import Node |
|
6
|
1 |
|
import uuid |
|
7
|
|
|
|
|
8
|
|
|
|
|
9
|
1 |
|
class EventGenerator(object): |
|
10
|
|
|
|
|
11
|
|
|
""" |
|
12
|
|
|
Create an event based on an event type. Per default is BaseEventType used. |
|
13
|
|
|
Object members are dynamically created from the base event type and send to |
|
14
|
|
|
client when evebt is triggered (see example code in source) |
|
15
|
|
|
|
|
16
|
|
|
Arguments to constructor are: |
|
17
|
|
|
|
|
18
|
|
|
server: The InternalSession object to use for query and event triggering |
|
19
|
|
|
|
|
20
|
|
|
event: The event object |
|
21
|
|
|
""" |
|
22
|
|
|
|
|
23
|
|
|
def __init__(self, isession, event=ua.BaseEvent()): |
|
24
|
|
|
self.isession = isession |
|
25
|
1 |
|
self.event = event |
|
26
|
1 |
|
|
|
27
|
|
|
self.source = Node(isession, self.event.SourceNode) |
|
28
|
1 |
|
if self.event.SourceNode.Identifier: |
|
29
|
|
|
self.event.SourceName = self.source.get_display_name().Text |
|
30
|
1 |
|
self.source.set_attribute(ua.AttributeIds.EventNotifier, ua.DataValue(ua.Variant(1, ua.VariantType.Byte))) |
|
31
|
|
|
|
|
32
|
|
|
def __str__(self): |
|
33
|
1 |
|
return "EventGenerator(Event:{})".format(self.event) |
|
34
|
|
|
__repr__ = __str__ |
|
35
|
1 |
|
|
|
36
|
1 |
|
def trigger(self, time=None, message=None): |
|
37
|
|
|
""" |
|
38
|
1 |
|
Trigger the event. This will send a notification to all subscribed clients |
|
39
|
|
|
""" |
|
40
|
|
|
self.event.EventId = ua.Variant(uuid.uuid4().hex, ua.VariantType.ByteString) |
|
41
|
1 |
|
if time: |
|
42
|
|
|
self.event.Time = time |
|
43
|
|
|
else: |
|
44
|
1 |
|
self.event.Time = datetime.utcnow() |
|
45
|
1 |
|
self.event.ReciveTime = datetime.utcnow() |
|
46
|
1 |
|
#FIXME: LocalTime is wrong but currently know better. For description s. Part 5 page 18 |
|
47
|
1 |
|
self.event.LocaleTime = datetime.utcnow() |
|
48
|
1 |
|
if message: |
|
49
|
1 |
|
self.Message = ua.LocalizedText(message) |
|
50
|
1 |
|
elif not self.event.Message and self.event.SourceNode.Identifier: |
|
51
|
1 |
|
self.event.Message = ua.LocalizedText(self.source.get_browse_name().Text) |
|
52
|
|
|
self.isession.subscription_service.trigger_event(self.event) |
|
53
|
|
|
|
FreeOpcUa /
python-opcua
