HistoryDict.new_historized_event() - Code Metrics - Inspection of "xmlexporter: move similar code to functions, small..." - FreeOpcUa/python-opcua - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( eb5e78...c75f71 )

by Olivier

created 2016-08-20 18:19 UTC

HistoryDict.new_historized_event() A

↳ Parent: HistoryDict

Complexity

Conditions

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	3
CRAP Score	2.0625

Importance

Changes

Metric	Value
cc	2
dl	0
loc	5
ccs	3
cts	4
cp	0.75
crap	2.0625
rs	9.4285
c	0
b	0
f	0

import logging
from datetime import timedelta
from datetime import datetime

from opcua import Subscription
from opcua import ua
from opcua.common import utils


class UaNodeAlreadyHistorizedError(ua.UaError):
    pass


class HistoryStorageInterface(object):

    """
    Interface of a history backend.
    Must be implemented by backends
    """

    def new_historized_node(self, node_id, period, count=0):
        """
        Called when a new node is to be historized
        Returns None
        """
        raise NotImplementedError

    def save_node_value(self, node_id, datavalue):
        """
        Called when the value of a historized node has changed and should be saved in history
        Returns None
        """
        raise NotImplementedError

    def read_node_history(self, node_id, start, end, nb_values):
        """
        Called when a client make a history read request for a node
        if start or end is missing then nb_values is used to limit query
        nb_values is the max number of values to read. Ignored if 0
        Start time and end time are inclusive
        Returns a list of DataValues and a continuation point which
        is None if all nodes are read or the ServerTimeStamp of the last rejected DataValue
        """
        raise NotImplementedError

    def new_historized_event(self, source_id, evtypes, period, count=0):
        """
        Called when historization of events is enabled on server side
        Returns None
        """
        raise NotImplementedError

    def save_event(self, event):
        """
        Called when a new event has been generated ans should be saved in history
        Returns None
        """
        raise NotImplementedError

    def read_event_history(self, source_id, start, end, nb_values, evfilter):
        """
        Called when a client make a history read request for events
        Start time and end time are inclusive
        Returns a list of Events and a continuation point which
        is None if all events are read or the ServerTimeStamp of the last rejected event
        """
        raise NotImplementedError

    def stop(self):
        """
        Called when the server shuts down
        Can be used to close database connections etc.
        """
        raise NotImplementedError


class HistoryDict(HistoryStorageInterface):
    """
    Very minimal history backend storing data in memory using a Python dictionary
    """

    def __init__(self):
        self._datachanges = {}
        self._datachanges_period = {}
        self._events = {}
        self._events_periods = {}

    def new_historized_node(self, node_id, period, count=0):
        if node_id in self._datachanges:
            raise UaNodeAlreadyHistorizedError(node_id)
        self._datachanges[node_id] = []
        self._datachanges_period[node_id] = period, count

    def save_node_value(self, node_id, datavalue):
        data = self._datachanges[node_id]
        period, count = self._datachanges_period[node_id]
        data.append(datavalue)
        now = datetime.utcnow()
        if period:
            while len(data) and now - data[0].ServerTimestamp > period:
                data.pop(0)
        if count and len(data) > count:
            data.pop(0)

    def read_node_history(self, node_id, start, end, nb_values):

        cont = None
        if node_id not in self._datachanges:
            print("Error attempt to read history for a node which is not historized")
            return [], cont
        else:
            if start is None:
                start = ua.DateTimeMinValue
            if end is None:
                end = ua.DateTimeMinValue
            if start == ua.DateTimeMinValue:
                results = [dv for dv in reversed(self._datachanges[node_id]) if start <= dv.ServerTimestamp]
            elif end == ua.DateTimeMinValue:
                results = [dv for dv in self._datachanges[node_id] if start <= dv.ServerTimestamp]
            elif start > end:
                results = [dv for dv in reversed(self._datachanges[node_id]) if end <= dv.ServerTimestamp <= start]

            else:
                results = [dv for dv in self._datachanges[node_id] if start <= dv.ServerTimestamp <= end]
            if nb_values and len(results) > nb_values:
                cont = results[nb_values + 1].ServerTimestamp
                results = results[:nb_values]
            return results, cont

    def new_historized_event(self, source_id, evtypes, period, count=0):
        if source_id in self._events:
            raise UaNodeAlreadyHistorizedError(source_id)
        self._events[source_id] = []
        self._events_periods[source_id] = period, count

    def save_event(self, event):
        evts = self._events[event.SourceNode]
        evts.append(event)
        period, count = self._events_periods[event.SourceNode]
        now = datetime.utcnow()
        if period:
            while len(evts) and now - evts[0].ServerTimestamp > period:
                evts.pop(0)
        if count and len(evts) > count:
            evts.pop(0)

    def read_event_history(self, source_id, start, end, nb_values, evfilter):

        cont = None
        if source_id not in self._events:
            print("Error attempt to read event history for a node which does not historize events")
            return [], cont
        else:
            if start is None:
                start = ua.DateTimeMinValue
            if end is None:
                end = ua.DateTimeMinValue
            if start == ua.DateTimeMinValue:
                results = [ev for ev in reversed(self._events[source_id]) if start <= ev.Time]
            elif end == ua.DateTimeMinValue:
                results = [ev for ev in self._events[source_id] if start <= ev.Time]
            elif start > end:
                results = [ev for ev in reversed(self._events[source_id]) if end <= ev.Time <= start]

            else:
                results = [ev for ev in self._events[source_id] if start <= ev.Time <= end]
            if nb_values and len(results) > nb_values:
                cont = results[nb_values + 1].Time
                results = results[:nb_values]
            return results, cont

    def stop(self):
        pass


class SubHandler(object):
    def __init__(self, storage):
        self.storage = storage

    def datachange_notification(self, node, val, data):
        self.storage.save_node_value(node.nodeid, data.monitored_item.Value)

    def event_notification(self, event):
        self.storage.save_event(event)


class HistoryManager(object):
    def __init__(self, iserver):
        self.logger = logging.getLogger(__name__)
        self.iserver = iserver
        self.storage = HistoryDict()
        self._sub = None
        self._handlers = {}

    def set_storage(self, storage):
        """
        set the desired HistoryStorageInterface which History Manager will use for historizing
        """
        self.storage = storage

    def _create_subscription(self, handler):
        params = ua.CreateSubscriptionParameters()
        params.RequestedPublishingInterval = 10
        params.RequestedLifetimeCount = 3000
        params.RequestedMaxKeepAliveCount = 10000
        params.MaxNotificationsPerPublish = 0
        params.PublishingEnabled = True
        params.Priority = 0
        return Subscription(self.iserver.isession, params, handler)

    def historize_data_change(self, node, period=timedelta(days=7), count=0):
        """
        Subscribe to the nodes' data changes and store the data in the active storage.
        """
        if not self._sub:
            self._sub = self._create_subscription(SubHandler(self.storage))
        if node in self._handlers:
            raise ua.UaError("Node {} is already historized".format(node))
        self.storage.new_historized_node(node.nodeid, period, count)
        handler = self._sub.subscribe_data_change(node)
        self._handlers[node] = handler

    def historize_event(self, source, period=timedelta(days=7), count=0):
        """
        Subscribe to the source nodes' events and store the data in the active storage.

        SQL Implementation
        The default is to historize every event type the source generates, custom event properties are included. At
        this time there is no way to historize a specific event type. The user software can filter out events which are
        not desired when reading.

        Note that adding custom events to a source node AFTER historizing has been activated is not supported at this
        time (in SQL history there will be no columns in the SQL table for the new event properties). For SQL The table
        must be deleted manually so that a new table with the custom event fields can be created.
        """
        if not self._sub:
            self._sub = self._create_subscription(SubHandler(self.storage))
        if source in self._handlers:
            raise ua.UaError("Events from {} are already historized".format(source))

        # get list of all event types that the source node generates; change this to only historize specific events
        event_types = source.get_referenced_nodes(ua.ObjectIds.GeneratesEvent)

        self.storage.new_historized_event(source.nodeid, event_types, period, count)

        handler = self._sub.subscribe_events(source, event_types)
        self._handlers[source] = handler

    def dehistorize(self, node):
        """
        Remove subscription to the node/source which is being historized

        SQL Implementation
        Only the subscriptions is removed. The historical data remains.
        """
        if node in self._handlers:
            self._sub.unsubscribe(self._handlers[node])
            del(self._handlers[node])
        else:
            self.logger.error("History Manager isn't subscribed to %s", node)

    def read_history(self, params):
        """
        Read history for a node
        This is the part AttributeService, but implemented as its own service
        since it requires more logic than other attribute service methods
        """
        results = []

        for rv in params.NodesToRead:
            res = self._read_history(params.HistoryReadDetails, rv)
            results.append(res)
        return results

    def _read_history(self, details, rv):
        """
        determine if the history read is for a data changes or events; then read the history for that node
        """
        result = ua.HistoryReadResult()
        if isinstance(details, ua.ReadRawModifiedDetails):
            if details.IsReadModified:
                result.HistoryData = ua.HistoryModifiedData()
                # we do not support modified history by design so we return what we have
            else:
                result.HistoryData = ua.HistoryData()
            dv, cont = self._read_datavalue_history(rv, details)
            result.HistoryData.DataValues = dv
            result.ContinuationPoint = cont

        elif isinstance(details, ua.ReadEventDetails):
            result.HistoryData = ua.HistoryEvent()
            # FIXME: filter is a cumbersome type, maybe transform it something easier
            # to handle for storage
            ev, cont = self._read_event_history(rv, details)
            result.HistoryData.Events = ev
            result.ContinuationPoint = cont

        else:
            # we do not currently support the other types, clients can process data themselves
            result.StatusCode = ua.StatusCode(ua.StatusCodes.BadNotImplemented)
        return result

    def _read_datavalue_history(self, rv, details):
        starttime = details.StartTime
        if rv.ContinuationPoint:
            # Spec says we should ignore details if cont point is present
            # but they also say we can use cont point as timestamp to enable stateless
            # implementation. This is contradictory, so we assume details is
            # send correctly with continuation point
            starttime = ua.unpack_datetime(utils.Buffer(rv.ContinuationPoint))

        dv, cont = self.storage.read_node_history(rv.NodeId,
                                                  starttime,
                                                  details.EndTime,
                                                  details.NumValuesPerNode)
        if cont:
            cont = ua.pack_datetime(cont)
        # rv.IndexRange
        # rv.DataEncoding # xml or binary, seems spec say we can ignore that one
        return dv, cont

    def _read_event_history(self, rv, details):
        starttime = details.StartTime
        if rv.ContinuationPoint:
            # Spec says we should ignore details if cont point is present
            # but they also say we can use cont point as timestamp to enable stateless
            # implementation. This is contradictory, so we assume details is
            # send correctly with continuation point
            starttime = ua.unpack_datetime(utils.Buffer(rv.ContinuationPoint))

        evts, cont = self.storage.read_event_history(rv.NodeId,
                                                     starttime,
                                                     details.EndTime,
                                                     details.NumValuesPerNode,
                                                     details.Filter)
        results = []
        for ev in evts:
            field_list = ua.HistoryEventFieldList()
            field_list.EventFields = ev.to_event_fields(details.Filter.SelectClauses)
            results.append(field_list)
        if cont:
            cont = ua.pack_datetime(cont)
        return results, cont

    def update_history(self, params):
        """
        Update history for a node
        This is the part AttributeService, but implemented as its own service
        since it requires more logic than other attribute service methods
        """
        results = []
        for _ in params.HistoryUpdateDetails:
            result = ua.HistoryUpdateResult()
            # we do not accept to rewrite history
            result.StatusCode = ua.StatusCode(ua.StatusCodes.BadNotWritable)
            results.append(results)
        return results

    def stop(self):
        """
        call stop methods of active storage interface whenever the server is stopped
        """
        self.storage.stop()


1	1		import logging
2	1		from datetime import timedelta
3	1		from datetime import datetime
4
5	1		from opcua import Subscription
6	1		from opcua import ua
7	1		from opcua.common import utils
8	1
9
10			class UaNodeAlreadyHistorizedError(ua.UaError):
11	1		pass
12
13
14			class HistoryStorageInterface(object):
15
16			"""
17			Interface of a history backend.
18	1		Must be implemented by backends
19			"""
20
21			def new_historized_node(self, node_id, period, count=0):
22			"""
23			Called when a new node is to be historized
24			Returns None
25	1		"""
26			raise NotImplementedError
27
28			def save_node_value(self, node_id, datavalue):
29			"""
30			Called when the value of a historized node has changed and should be saved in history
31			Returns None
32	1		"""
33			raise NotImplementedError
34
35			def read_node_history(self, node_id, start, end, nb_values):
36			"""
37			Called when a client make a history read request for a node
38			if start or end is missing then nb_values is used to limit query
39			nb_values is the max number of values to read. Ignored if 0
40			Start time and end time are inclusive
41			Returns a list of DataValues and a continuation point which
42			is None if all nodes are read or the ServerTimeStamp of the last rejected DataValue
43	1		"""
44			raise NotImplementedError
45
46			def new_historized_event(self, source_id, evtypes, period, count=0):
47			"""
48			Called when historization of events is enabled on server side
49			Returns None
50			"""
51	1		raise NotImplementedError
52
53			def save_event(self, event):
54			"""
55			Called when a new event has been generated ans should be saved in history
56			Returns None
57			"""
58	1		raise NotImplementedError
59
60			def read_event_history(self, source_id, start, end, nb_values, evfilter):
61			"""
62			Called when a client make a history read request for events
63			Start time and end time are inclusive
64			Returns a list of Events and a continuation point which
65			is None if all events are read or the ServerTimeStamp of the last rejected event
66			"""
67	1		raise NotImplementedError
68
69			def stop(self):
70			"""
71			Called when the server shuts down
72			Can be used to close database connections etc.
73			"""
74			raise NotImplementedError
75	1
76
77			class HistoryDict(HistoryStorageInterface):
78			"""
79	1		Very minimal history backend storing data in memory using a Python dictionary
80	1		"""
81	1
82	1		def __init__(self):
83			self._datachanges = {}
84	1		self._datachanges_period = {}
85	1		self._events = {}
86	1		self._events_periods = {}
87
88	1		def new_historized_node(self, node_id, period, count=0):
89	1		if node_id in self._datachanges:
90	1		raise UaNodeAlreadyHistorizedError(node_id)
91	1		self._datachanges[node_id] = []
92	1		self._datachanges_period[node_id] = period, count
93	1
94	1		def save_node_value(self, node_id, datavalue):
95			data = self._datachanges[node_id]
96	1		period, count = self._datachanges_period[node_id]
97	1		data.append(datavalue)
98			now = datetime.utcnow()
99	1		if period:
100	1		while len(data) and now - data[0].ServerTimestamp > period:
101	1		data.pop(0)
102			if count and len(data) > count:
103			data.pop(0)
104
105	1	View Code Duplication	def read_node_history(self, node_id, start, end, nb_values):
			0 ignored issues – show Duplication introduced 2016-05-26 16:04 UTC by Report Bug Copy Issue Report This code seems to be duplicated in your project. Loading history...
106			cont = None
107	1		if node_id not in self._datachanges:
108			print("Error attempt to read history for a node which is not historized")
109	1		return [], cont
110	1		else:
111	1		if start is None:
112	1		start = ua.DateTimeMinValue
113	1		if end is None:
114	1		end = ua.DateTimeMinValue
115			if start == ua.DateTimeMinValue:
116			results = [dv for dv in reversed(self._datachanges[node_id]) if start <= dv.ServerTimestamp]
117	1		elif end == ua.DateTimeMinValue:
118	1		results = [dv for dv in self._datachanges[node_id] if start <= dv.ServerTimestamp]
119	1		elif start > end:
120	1		results = [dv for dv in reversed(self._datachanges[node_id]) if end <= dv.ServerTimestamp <= start]
121	1
122			else:
123	1		results = [dv for dv in self._datachanges[node_id] if start <= dv.ServerTimestamp <= end]
124	1		if nb_values and len(results) > nb_values:
125			cont = results[nb_values + 1].ServerTimestamp
126	1		results = results[:nb_values]
127			return results, cont
128
129	1		def new_historized_event(self, source_id, evtypes, period, count=0):
130			if source_id in self._events:
131			raise UaNodeAlreadyHistorizedError(source_id)
132	1		self._events[source_id] = []
133	1		self._events_periods[source_id] = period, count
134
135			def save_event(self, event):
136	1		evts = self._events[event.SourceNode]
137	1		evts.append(event)
138	1		period, count = self._events_periods[event.SourceNode]
139			now = datetime.utcnow()
140	1		if period:
141	1		while len(evts) and now - evts[0].ServerTimestamp > period:
142			evts.pop(0)
143	1		if count and len(evts) > count:
144	1		evts.pop(0)
145
146		View Code Duplication	def read_event_history(self, source_id, start, end, nb_values, evfilter):
			0 ignored issues – show Duplication introduced 2016-05-26 16:04 UTC by Report Bug Copy Issue Report This code seems to be duplicated in your project. Loading history...
147	1		cont = None
148	1		if source_id not in self._events:
149	1		print("Error attempt to read event history for a node which does not historize events")
150	1		return [], cont
151	1		else:
152	1		if start is None:
153	1		start = ua.DateTimeMinValue
154			if end is None:
155	1		end = ua.DateTimeMinValue
156			if start == ua.DateTimeMinValue:
157			results = [ev for ev in reversed(self._events[source_id]) if start <= ev.Time]
158			elif end == ua.DateTimeMinValue:
159	1		results = [ev for ev in self._events[source_id] if start <= ev.Time]
160			elif start > end:
161	1		results = [ev for ev in reversed(self._events[source_id]) if end <= ev.Time <= start]
162	1
163	1		else:
164	1		results = [ev for ev in self._events[source_id] if start <= ev.Time <= end]
165	1		if nb_values and len(results) > nb_values:
166	1		cont = results[nb_values + 1].Time
167	1		results = results[:nb_values]
168	1		return results, cont
169	1
170			def stop(self):
171	1		pass
172
173
174			class SubHandler(object):
175	1		def __init__(self, storage):
176	1		self.storage = storage
177	1
178			def datachange_notification(self, node, val, data):
179	1		self.storage.save_node_value(node.nodeid, data.monitored_item.Value)
180	1
181	1		def event_notification(self, event):
182			self.storage.save_event(event)
183	1
184
185			class HistoryManager(object):
186			def __init__(self, iserver):
187	1		self.logger = logging.getLogger(__name__)
188	1		self.iserver = iserver
189	1		self.storage = HistoryDict()
190			self._sub = None
191			self._handlers = {}
192
193	1		def set_storage(self, storage):
194			"""
195	1		set the desired HistoryStorageInterface which History Manager will use for historizing
196			"""
197	1		self.storage = storage
198	1
199			def _create_subscription(self, handler):
200	1		params = ua.CreateSubscriptionParameters()
201			params.RequestedPublishingInterval = 10
202			params.RequestedLifetimeCount = 3000
203			params.RequestedMaxKeepAliveCount = 10000
204	1		params.MaxNotificationsPerPublish = 0
205	1		params.PublishingEnabled = True
206	1		params.Priority = 0
207			return Subscription(self.iserver.isession, params, handler)
208
209			def historize_data_change(self, node, period=timedelta(days=7), count=0):
210	1		"""
211			Subscribe to the nodes' data changes and store the data in the active storage.
212			"""
213			if not self._sub:
214			self._sub = self._create_subscription(SubHandler(self.storage))
215			if node in self._handlers:
216	1		raise ua.UaError("Node {} is already historized".format(node))
217			self.storage.new_historized_node(node.nodeid, period, count)
218	1		handler = self._sub.subscribe_data_change(node)
219	1		self._handlers[node] = handler
220	1
221	1		def historize_event(self, source, period=timedelta(days=7), count=0):
222			"""
223	1		Subscribe to the source nodes' events and store the data in the active storage.
224
225			SQL Implementation
226			The default is to historize every event type the source generates, custom event properties are included. At
227	1		this time there is no way to historize a specific event type. The user software can filter out events which are
228	1		not desired when reading.
229	1
230			Note that adding custom events to a source node AFTER historizing has been activated is not supported at this
231			time (in SQL history there will be no columns in the SQL table for the new event properties). For SQL The table
232			must be deleted manually so that a new table with the custom event fields can be created.
233	1		"""
234	1		if not self._sub:
235	1		self._sub = self._create_subscription(SubHandler(self.storage))
236	1		if source in self._handlers:
237			raise ua.UaError("Events from {} are already historized".format(source))
238	1
239	1		# get list of all event types that the source node generates; change this to only historize specific events
240			event_types = source.get_referenced_nodes(ua.ObjectIds.GeneratesEvent)
241
242	1		self.storage.new_historized_event(source.nodeid, event_types, period, count)
243	1
244	1		handler = self._sub.subscribe_events(source, event_types)
245			self._handlers[source] = handler
246
247			def dehistorize(self, node):
248			"""
249	1		Remove subscription to the node/source which is being historized
250
251	1		SQL Implementation
252	1		Only the subscriptions is removed. The historical data remains.
253	1		"""
254			if node in self._handlers:
255			self._sub.unsubscribe(self._handlers[node])
256			del(self._handlers[node])
257			else:
258			self.logger.error("History Manager isn't subscribed to %s", node)
259
260			def read_history(self, params):
261	1		"""
262			Read history for a node
263			This is the part AttributeService, but implemented as its own service
264			since it requires more logic than other attribute service methods
265	1		"""
266			results = []
267	1
268			for rv in params.NodesToRead:
269			res = self._read_history(params.HistoryReadDetails, rv)
270	1		results.append(res)
271			return results
272	1
273	1		def _read_history(self, details, rv):
274	1		"""
275			determine if the history read is for a data changes or events; then read the history for that node
276			"""
277			result = ua.HistoryReadResult()
278			if isinstance(details, ua.ReadRawModifiedDetails):
279			if details.IsReadModified:
280			result.HistoryData = ua.HistoryModifiedData()
281			# we do not support modified history by design so we return what we have
282	1		else:
283			result.HistoryData = ua.HistoryData()
284			dv, cont = self._read_datavalue_history(rv, details)
285			result.HistoryData.DataValues = dv
286			result.ContinuationPoint = cont
287	1
288			elif isinstance(details, ua.ReadEventDetails):
289	1		result.HistoryData = ua.HistoryEvent()
290	1		# FIXME: filter is a cumbersome type, maybe transform it something easier
291			# to handle for storage
292	1		ev, cont = self._read_event_history(rv, details)
293			result.HistoryData.Events = ev
294	1		result.ContinuationPoint = cont
295
296	1		else:
297	1		# we do not currently support the other types, clients can process data themselves
298	1		result.StatusCode = ua.StatusCode(ua.StatusCodes.BadNotImplemented)
299			return result
300	1
301	1		def _read_datavalue_history(self, rv, details):
302	1		starttime = details.StartTime
303	1		if rv.ContinuationPoint:
304			# Spec says we should ignore details if cont point is present
305	1		# but they also say we can use cont point as timestamp to enable stateless
306			# implementation. This is contradictory, so we assume details is
307			# send correctly with continuation point
308			starttime = ua.unpack_datetime(utils.Buffer(rv.ContinuationPoint))
309
310			dv, cont = self.storage.read_node_history(rv.NodeId,
311			starttime,
312			details.EndTime,
313			details.NumValuesPerNode)
314			if cont:
315			cont = ua.pack_datetime(cont)
316			# rv.IndexRange
317			# rv.DataEncoding # xml or binary, seems spec say we can ignore that one
318			return dv, cont
319	1
320			def _read_event_history(self, rv, details):
321			starttime = details.StartTime
322			if rv.ContinuationPoint:
323	1		# Spec says we should ignore details if cont point is present
324			# but they also say we can use cont point as timestamp to enable stateless
325			# implementation. This is contradictory, so we assume details is
326			# send correctly with continuation point
327			starttime = ua.unpack_datetime(utils.Buffer(rv.ContinuationPoint))
328
329			evts, cont = self.storage.read_event_history(rv.NodeId,
330			starttime,
331			details.EndTime,
332			details.NumValuesPerNode,
333			details.Filter)
334			results = []
335			for ev in evts:
336			field_list = ua.HistoryEventFieldList()
337			field_list.EventFields = ev.to_event_fields(details.Filter.SelectClauses)
338			results.append(field_list)
339			if cont:
340			cont = ua.pack_datetime(cont)
341			return results, cont
342
343			def update_history(self, params):
344			"""
345			Update history for a node
346			This is the part AttributeService, but implemented as its own service
347			since it requires more logic than other attribute service methods
348			"""
349			results = []
350			for _ in params.HistoryUpdateDetails:
351			result = ua.HistoryUpdateResult()
352			# we do not accept to rewrite history
353			result.StatusCode = ua.StatusCode(ua.StatusCodes.BadNotWritable)
354			results.append(results)
355			return results
356
357			def stop(self):
358			"""
359			call stop methods of active storage interface whenever the server is stopped
360			"""
361			self.storage.stop()
362

FreeOpcUa / python-opcua

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HistoryDict.new_historized_event() A

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