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from datetime import datetime |
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from opcua import ua |
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from opcua import Node |
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import uuid |
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class EventGenerator(object): |
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""" |
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Create an event based on an event type. Per default is BaseEventType used. |
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Object members are dynamically created from the base event type and send to |
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client when evebt is triggered (see example code in source) |
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Arguments to constructor are: |
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server: The InternalSession object to use for query and event triggering |
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event: The event object |
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source: The emiting source for the node, either an objectId, NodeId or a Node |
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""" |
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def __init__(self, isession, event=ua.BaseEvent()): |
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self.isession = isession |
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self.event = event |
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self.source = Node(isession, self.event.SourceNode) |
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if self.event.SourceNode.Identifier: |
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self.event.SourceName = self.source.get_display_name().Text |
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self.source.set_attribute(ua.AttributeIds.EventNotifier, ua.DataValue(ua.Variant(1, ua.VariantType.Byte))) |
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def __str__(self): |
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return "EventGenerator(Event:{})".format(self.event) |
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__repr__ = __str__ |
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def trigger(self, time=None, message=None): |
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""" |
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Trigger the event. This will send a notification to all subscribed clients |
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""" |
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self.event.EventId = ua.Variant(uuid.uuid4().hex, ua.VariantType.ByteString) |
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if time: |
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self.event.Time = time |
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else: |
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self.event.Time = datetime.utcnow() |
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self.event.ReciveTime = datetime.utcnow() |
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#FIXME: LocalTime is wrong but currently know better. For description s. Part 5 page 18 |
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self.event.LocaleTime = datetime.utcnow() |
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if message: |
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self.Message = ua.LocalizedText(message) |
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elif not self.event.Message and self.event.SourceNode.Identifier: |
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self.event.Message = ua.LocalizedText(self.source.get_browse_name().Text) |
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self.isession.subscription_service.trigger_event(self.event) |
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FreeOpcUa /
python-opcua
