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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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source: The emiting source for the node, either an objectId, NodeId or a Node |
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etype: The event type, either an objectId, a NodeId or a Node object |
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""" |
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def __init__(self, isession, etype=ua.BaseEvent(), source=ua.ObjectIds.Server): |
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self.isession = isession |
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self.event = None |
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node = None |
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if isinstance(etype, ua.BaseEvent): |
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self.event = etype |
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elif isinstance(etype, Node): |
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node = etype |
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elif isinstance(etype, ua.NodeId): |
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node = Node(self.isession, etype) |
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else: |
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node = Node(self.isession, ua.NodeId(etype)) |
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if node: |
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self.event = get_event_from_node(node) |
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if isinstance(source, Node): |
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pass |
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elif isinstance(source, ua.NodeId): |
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source = Node(isession, source) |
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else: |
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source = Node(isession, ua.NodeId(source)) |
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if self.event.SourceNode.Identifier: |
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source = Node(self.isession, self.event.SourceNode) |
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self.event.SourceName = source.get_display_name().Text |
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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(Type:{}, Source:{}, Time:{}, Message: {})".format(self.EventType, self.SourceNode, self.Time, self.Message) |
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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.RecieveTime = 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.LocalTime = 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: |
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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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def get_event_from_node(node): |
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if node.nodeid.Identifier in ua.uaevents_auto.IMPLEMNTED_EVENTS.keys(): |
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return ua.uaevents_auto.IMPLEMNTED_EVENTS[node.nodeid.Identifier]() |
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else: |
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parent_identifier, parent_eventtype = _find_parent_eventtype(node) |
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if not parent_eventtype: |
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return None |
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class CustomEvent(parent_eventtype): |
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def __init__(self): |
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super(CustomEvent, self).__init__() |
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curr_node = node |
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while curr_node.nodeid.Identifier != parent_identifier: |
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properties = curr_node.get_referenced_nodes(refs=ua.ObjectIds.HasProperty, direction=ua.BrowseDirection.Forward) |
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for prop in properties: |
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setattr(self, prop.get_browse_name().Name, prop.get_value()) |
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parents = node.get_referenced_nodes(refs=ua.ObjectIds.HasSubtype, direction=ua.BrowseDirection.Inverse, includesubtypes=False) |
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if len(parents) != 1: # Something went wrong |
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return None |
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curr_node = parents[0] |
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#TODO: Extend to show all fields of CustomEvent |
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def __str__(self): |
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s = 'CustomEvent(' |
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s += 'EventId:{}'.format(self.EventId) |
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s += ', EventType:{}'.format(self.EventType) |
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s += ', SourceNode:{}'.format(self.SourceNode) |
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s += ', SourceName:{}'.format(self.SourceName) |
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s += ', Time:{}'.format(self.Time) |
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s += ', RecieveTime:{}'.format(self.RecieveTime) |
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s += ', LocalTime:{}'.format(self.LocalTime) |
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s += ', Message:{}'.format(self.Message) |
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s += ', Severity:{}'.format(self.Severity) |
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s += ')' |
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#class CustomEvent(): |
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#pass |
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#references = node.get_children_descriptions(refs=ua.ObjectIds.HasProperty) |
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#for desc in references: |
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#child = Node(self.isession, desc.NodeId) |
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#setattr(self.event, desc.BrowseName.Name, child.get_value()) |
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return CustomEvent() |
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def _find_parent_eventtype(node): |
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parents = node.get_referenced_nodes(refs=ua.ObjectIds.HasSubtype, direction=ua.BrowseDirection.Inverse, includesubtypes=False) |
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if len(parents) != 1: # Something went wrong |
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return None |
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if parents[0].nodeid.Identifier in ua.uaevents_auto.IMPLEMNTED_EVENTS.keys(): |
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return node.nodeid.Identifier, ua.uaevents_auto.IMPLEMNTED_EVENTS[parents[0].nodeid.Identifier] |
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else: |
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_find_parent_eventtype(parents[0]) |
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FreeOpcUa /
python-opcua
