HistoryDict.read_event_history() - Code Metrics - Inspection of "Merge pull request #190 from FreeOpcUa/morevents" - FreeOpcUa/python-opcua - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 175840...68f055 )

by Olivier

created 2016-05-27 19:08 UTC

HistoryDict.read_event_history() F

↳ Parent: HistoryDict

Complexity

Conditions

Size

Total Lines

Duplication

Lines	23
Ratio	100 %

Code Coverage

Tests	17
CRAP Score	17

Importance

Changes	2
Bugs	0	Features	0

Metric	Value
cc	17
c	2
b	0
f	0
dl	23
loc	23
ccs	17
cts	17
cp	1
crap	17
rs	3.0143

How to fix Complexity

import logging
from datetime import timedelta
from datetime import datetime

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


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, etype, 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, etype, period, count):
        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; custom event properties included
        """
        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 the event types the source node generates and a list of all possible event fields
        event_types, ev_fields = self._get_source_event_data(source)

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

        handler = self._sub.subscribe_events(source)  # FIXME supply list of event types when master is fixed
        self._handlers[source] = handler

    def dehistorize(self, node):
        """
        remove subscription to the node/source which is being historized
        """
        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 _get_source_event_data(self, source):
        # get all event types which the source node can generate; get the fields of those event types
        event_types = source.get_referenced_nodes(ua.ObjectIds.GeneratesEvent)

        ev_aggregate_fields = []
        for event_type in event_types:
            ev_aggregate_fields.extend((events.get_event_properties_from_type_node(event_type)))

        ev_fields = []
        for field in set(ev_aggregate_fields):
            ev_fields.append(field.get_display_name().Text.decode(encoding='utf-8'))
        return event_types, ev_fields

    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		from opcua.common import events
9
10
11	1		class UaNodeAlreadyHistorizedError(ua.UaError):
12			pass
13
14
15			class HistoryStorageInterface(object):
16
17			"""
18	1		Interface of a history backend.
19			Must be implemented by backends
20			"""
21
22			def new_historized_node(self, node_id, period, count=0):
23			"""
24			Called when a new node is to be historized
25	1		Returns None
26			"""
27			raise NotImplementedError
28
29			def save_node_value(self, node_id, datavalue):
30			"""
31			Called when the value of a historized node has changed and should be saved in history
32	1		Returns None
33			"""
34			raise NotImplementedError
35
36			def read_node_history(self, node_id, start, end, nb_values):
37			"""
38			Called when a client make a history read request for a node
39			if start or end is missing then nb_values is used to limit query
40			nb_values is the max number of values to read. Ignored if 0
41			Start time and end time are inclusive
42			Returns a list of DataValues and a continuation point which
43	1		is None if all nodes are read or the ServerTimeStamp of the last rejected DataValue
44			"""
45			raise NotImplementedError
46
47			def new_historized_event(self, source_id, etype, period, count=0):
48			"""
49			Called when historization of events is enabled on server side
50			Returns None
51	1		"""
52			raise NotImplementedError
53
54			def save_event(self, event):
55			"""
56			Called when a new event has been generated ans should be saved in history
57			Returns None
58	1		"""
59			raise NotImplementedError
60
61			def read_event_history(self, source_id, start, end, nb_values, evfilter):
62			"""
63			Called when a client make a history read request for events
64			Start time and end time are inclusive
65			Returns a list of Events and a continuation point which
66			is None if all events are read or the ServerTimeStamp of the last rejected event
67	1		"""
68			raise NotImplementedError
69
70			def stop(self):
71			"""
72			Called when the server shuts down
73			Can be used to close database connections etc.
74			"""
75	1		raise NotImplementedError
76
77
78			class HistoryDict(HistoryStorageInterface):
79	1		"""
80	1		very minimal history backend storing data in memory using a Python dictionary
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, etype, period, count):
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; custom event properties included
224			"""
225			if not self._sub:
226			self._sub = self._create_subscription(SubHandler(self.storage))
227	1		if source in self._handlers:
228	1		raise ua.UaError("Events from {} are already historized".format(source))
229	1
230			# get the event types the source node generates and a list of all possible event fields
231			event_types, ev_fields = self._get_source_event_data(source)
232
233	1		self.storage.new_historized_event(source.nodeid, ev_fields, period, count)
234	1
235	1		handler = self._sub.subscribe_events(source) # FIXME supply list of event types when master is fixed
236	1		self._handlers[source] = handler
237
238	1		def dehistorize(self, node):
239	1		"""
240			remove subscription to the node/source which is being historized
241			"""
242	1		if node in self._handlers:
243	1		self._sub.unsubscribe(self._handlers[node])
244	1		del(self._handlers[node])
245			else:
246			self.logger.error("History Manager isn't subscribed to %s", node)
247
248			def read_history(self, params):
249	1		"""
250			Read history for a node
251	1		This is the part AttributeService, but implemented as its own service
252	1		since it requires more logic than other attribute service methods
253	1		"""
254			results = []
255
256			for rv in params.NodesToRead:
257			res = self._read_history(params.HistoryReadDetails, rv)
258			results.append(res)
259			return results
260
261	1		def _read_history(self, details, rv):
262			"""
263			determine if the history read is for a data changes or events; then read the history for that node
264			"""
265	1		result = ua.HistoryReadResult()
266			if isinstance(details, ua.ReadRawModifiedDetails):
267	1		if details.IsReadModified:
268			result.HistoryData = ua.HistoryModifiedData()
269			# we do not support modified history by design so we return what we have
270	1		else:
271			result.HistoryData = ua.HistoryData()
272	1		dv, cont = self._read_datavalue_history(rv, details)
273	1		result.HistoryData.DataValues = dv
274	1		result.ContinuationPoint = cont
275
276			elif isinstance(details, ua.ReadEventDetails):
277			result.HistoryData = ua.HistoryEvent()
278			# FIXME: filter is a cumbersome type, maybe transform it something easier
279			# to handle for storage
280			ev, cont = self._read_event_history(rv, details)
281			result.HistoryData.Events = ev
282	1		result.ContinuationPoint = cont
283
284			else:
285			# we do not currently support the other types, clients can process data themselves
286			result.StatusCode = ua.StatusCode(ua.StatusCodes.BadNotImplemented)
287	1		return result
288
289	1		def _read_datavalue_history(self, rv, details):
290	1		starttime = details.StartTime
291			if rv.ContinuationPoint:
292	1		# Spec says we should ignore details if cont point is present
293			# but they also say we can use cont point as timestamp to enable stateless
294	1		# implementation. This is contradictory, so we assume details is
295			# send correctly with continuation point
296	1		starttime = ua.unpack_datetime(utils.Buffer(rv.ContinuationPoint))
297	1
298	1		dv, cont = self.storage.read_node_history(rv.NodeId,
299			starttime,
300	1		details.EndTime,
301	1		details.NumValuesPerNode)
302	1		if cont:
303	1		cont = ua.pack_datetime(cont)
304			# rv.IndexRange
305	1		# rv.DataEncoding # xml or binary, seems spec say we can ignore that one
306			return dv, cont
307
308			def _read_event_history(self, rv, details):
309			starttime = details.StartTime
310			if rv.ContinuationPoint:
311			# Spec says we should ignore details if cont point is present
312			# but they also say we can use cont point as timestamp to enable stateless
313			# implementation. This is contradictory, so we assume details is
314			# send correctly with continuation point
315			starttime = ua.unpack_datetime(utils.Buffer(rv.ContinuationPoint))
316
317			evts, cont = self.storage.read_event_history(rv.NodeId,
318			starttime,
319	1		details.EndTime,
320			details.NumValuesPerNode,
321			details.Filter)
322			results = []
323	1		for ev in evts:
324			field_list = ua.HistoryEventFieldList()
325			field_list.EventFields = ev.to_event_fields(details.Filter.SelectClauses)
326			results.append(field_list)
327			if cont:
328			cont = ua.pack_datetime(cont)
329			return results, cont
330
331			def _get_source_event_data(self, source):
332			# get all event types which the source node can generate; get the fields of those event types
333			event_types = source.get_referenced_nodes(ua.ObjectIds.GeneratesEvent)
334
335			ev_aggregate_fields = []
336			for event_type in event_types:
337			ev_aggregate_fields.extend((events.get_event_properties_from_type_node(event_type)))
338
339			ev_fields = []
340			for field in set(ev_aggregate_fields):
341			ev_fields.append(field.get_display_name().Text.decode(encoding='utf-8'))
342			return event_types, ev_fields
343
344			def update_history(self, params):
345			"""
346			Update history for a node
347			This is the part AttributeService, but implemented as its own service
348			since it requires more logic than other attribute service methods
349			"""
350			results = []
351			for _ in params.HistoryUpdateDetails:
352			result = ua.HistoryUpdateResult()
353			# we do not accept to rewrite history
354			result.StatusCode = ua.StatusCode(ua.StatusCodes.BadNotWritable)
355			results.append(results)
356			return results
357
358			def stop(self):
359			"""
360			call stop methods of active storage interface whenever the server is stopped
361			"""
362			self.storage.stop()
363

FreeOpcUa / python-opcua

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HistoryDict.read_event_history() F

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