Subscription.unsubscribe() - Code Metrics - Inspection of "Merge pull request #207 from zerox1212/master" - FreeOpcUa/python-opcua - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 4652a3...eeb0ed )

by Olivier

created 2016-06-17 11:04 UTC

Subscription.unsubscribe() A

↳ Parent: Subscription

Complexity

Conditions

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	7
CRAP Score	4

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	4
c	1
b	0
f	0
dl	0
loc	15
ccs	7
cts	7
cp	1
crap	4
rs	9.2

"""
high level interface to subscriptions
"""
import time
import logging
from threading import Lock

from opcua import ua
from opcua.common import events
from opcua import Node


class SubHandler(object):
    """
    Subscription Handler. To receive events from server for a subscription
    This class is just a sample class. Whatever class having these methods can be used
    """

    def data_change(self, handle, node, val, attr):
        """
        Deprecated, use datachange_notification
        """
        pass

    def datachange_notification(self, node, val, data):
        """
        called for every datachange notification from server
        """
        pass

    def event_notification(self, event):
        """
        called for every event notification from server
        """
        pass

    def status_change_notification(self, status):
        """
        called for every status change notification from server
        """
        pass


class SubscriptionItemData(object):
    """
    To store useful data from a monitored item
    """
    def __init__(self):
        self.node = None
        self.client_handle = None
        self.server_handle = None
        self.attribute = None
        self.mfilter = None


class DataChangeNotif(object):
    """
    To be send to clients for every datachange notification from server
    """
    def __init__(self, subscription_data, monitored_item):
        self.monitored_item = monitored_item
        self.subscription_data = subscription_data

    def __str__(self):
        return "DataChangeNotification({}, {})".format(self.subscription_data, self.monitored_item)
    __repr__ = __str__


class Subscription(object):
    """
    Subscription object returned by Server or Client objects.
    The object represent a subscription to an opc-ua server.
    This is a high level class, especially subscribe_data_change
    and subscribe_events methods. If more control is necessary look at
    code and/or use create_monitored_items method.
    """

    def __init__(self, server, params, handler):
        self.logger = logging.getLogger(__name__)
        self.server = server
        self._client_handle = 200
        self._handler = handler
        self.parameters = params  # move to data class
        self._monitoreditems_map = {}
        self._lock = Lock()
        self.subscription_id = None
        response = self.server.create_subscription(params, self.publish_callback)
        self.subscription_id = response.SubscriptionId  # move to data class
        self.server.publish()
        self.server.publish()

    def delete(self):
        """
        Delete subscription on server. This is automatically done by Client and Server classes on exit
        """
        results = self.server.delete_subscriptions([self.subscription_id])
        results[0].check()

    def publish_callback(self, publishresult):
        self.logger.info("Publish callback called with result: %s", publishresult)
        while self.subscription_id is None:
            time.sleep(0.01)

        for notif in publishresult.NotificationMessage.NotificationData:
            if isinstance(notif, ua.DataChangeNotification):
                self._call_datachange(notif)
            elif isinstance(notif, ua.EventNotificationList):
                self._call_event(notif)
            elif isinstance(notif, ua.StatusChangeNotification):
                self._call_status(notif)
            else:
                self.logger.warning("Notification type not supported yet for notification %s", notif)

        ack = ua.SubscriptionAcknowledgement()
        ack.SubscriptionId = self.subscription_id
        ack.SequenceNumber = publishresult.NotificationMessage.SequenceNumber
        self.server.publish([ack])

    def _call_datachange(self, datachange):
        for item in datachange.MonitoredItems:
            with self._lock:
                if item.ClientHandle not in self._monitoreditems_map:
                    self.logger.warning("Received a notification for unknown handle: %s", item.ClientHandle)
                    continue
                data = self._monitoreditems_map[item.ClientHandle]
            if hasattr(self._handler, "datachange_notification"):
                event_data = DataChangeNotif(data, item)
                try:
                    self._handler.datachange_notification(data.node, item.Value.Value.Value, event_data)
                except Exception:
                    self.logger.exception("Exception calling data change handler")
            elif hasattr(self._handler, "data_change"):  # deprecated API
                self.logger.warning("data_change method is deprecated, use datachange_notification")
                try:
                    self._handler.data_change(data.server_handle, data.node, item.Value.Value.Value, data.attribute)
                except Exception:
                    self.logger.exception("Exception calling deprecated data change handler")
            else:
                self.logger.error("DataChange subscription created but handler has no datachange_notification method")

    def _call_event(self, eventlist):
        for event in eventlist.Events:
            with self._lock:
                data = self._monitoreditems_map[event.ClientHandle]
            result = events.Event.from_event_fields(data.mfilter.SelectClauses, event.EventFields)
            result.server_handle = data.server_handle
            if hasattr(self._handler, "event_notification"):
                try:
                    self._handler.event_notification(result)
                except Exception:
                    self.logger.exception("Exception calling event handler")
            elif hasattr(self._handler, "event"):  # depcrecated API
                try:
                    self._handler.event(data.server_handle, result)
                except Exception:
                    self.logger.exception("Exception calling deprecated event handler")
            else:
                self.logger.error("Event subscription created but handler has no event_notification method")

    def _call_status(self, status):
        try:
            self._handler.status_change_notification(status.Status)
        except Exception:
            self.logger.exception("Exception calling status change handler")

    def subscribe_data_change(self, nodes, attr=ua.AttributeIds.Value):
        """
        Subscribe for data change events for a node or list of nodes.
        default attribute is Value.
        Return a handle which can be used to unsubscribe
        If more control is necessary use create_monitored_items method
        """
        return self._subscribe(nodes, attr, queuesize=0)

    def subscribe_events(self, sourcenode=ua.ObjectIds.Server, evtypes=ua.ObjectIds.BaseEventType, evfilter=None):
        """
        Subscribe to events from a node. Default node is Server node.
        In most servers the server node is the only one you can subscribe to.
        if evtypes is not provided, evtype defaults to BaseEventType
        if evtypes is a list or tuple of custom event types, the events will be filtered to the supplied types
        Return a handle which can be used to unsubscribe
        """
        sourcenode = Node(self.server, sourcenode)

        if evfilter is None:
            if not type(evtypes) in (list, tuple):
                evtypes = [evtypes]

            evtypes = [Node(self.server, evtype) for evtype in evtypes]

            evfilter = events.get_filter_from_event_type(evtypes)
        return self._subscribe(sourcenode, ua.AttributeIds.EventNotifier, evfilter)

    def _subscribe(self, nodes, attr, mfilter=None, queuesize=0):
        is_list = True
        if not type(nodes) in (list, tuple):
            is_list = False
            nodes = [nodes]
        mirs = []
        for node in nodes:
            mir = self._make_monitored_item_request(node, attr, mfilter, queuesize)
            mirs.append(mir)

        mids = self.create_monitored_items(mirs)
        if is_list:
            return mids
        if type(mids[0]) == ua.StatusCode:
            mids[0].check()
        return mids[0]

    def _make_monitored_item_request(self, node, attr, mfilter, queuesize):
        rv = ua.ReadValueId()
        rv.NodeId = node.nodeid
        rv.AttributeId = attr
        # rv.IndexRange //We leave it null, then the entire array is returned
        mparams = ua.MonitoringParameters()
        with self._lock:
            self._client_handle += 1
            mparams.ClientHandle = self._client_handle
        mparams.SamplingInterval = self.parameters.RequestedPublishingInterval
        mparams.QueueSize = queuesize
        mparams.DiscardOldest = True
        if mfilter:
            mparams.Filter = mfilter
        mir = ua.MonitoredItemCreateRequest()
        mir.ItemToMonitor = rv
        mir.MonitoringMode = ua.MonitoringMode.Reporting
        mir.RequestedParameters = mparams
        return mir

    def create_monitored_items(self, monitored_items):
        """
        low level method to have full control over subscription parameters
        Client handle must be unique since it will be used as key for internal registration of data
        """
        params = ua.CreateMonitoredItemsParameters()
        params.SubscriptionId = self.subscription_id
        params.ItemsToCreate = monitored_items
        params.TimestampsToReturn = ua.TimestampsToReturn.Neither

        # insert monitored item into map to avoid notification arrive before result return
        # server_handle is left as None in purpose as we don't get it yet.
        with self._lock:
            for mi in monitored_items:
                data = SubscriptionItemData()
                data.client_handle = mi.RequestedParameters.ClientHandle
                data.node = Node(self.server, mi.ItemToMonitor.NodeId)
                data.attribute = mi.ItemToMonitor.AttributeId
                #TODO: Either use the filter from request or from response. Here it uses from request, in modify it uses from response
                data.mfilter = mi.RequestedParameters.Filter
                self._monitoreditems_map[mi.RequestedParameters.ClientHandle] = data
        results = self.server.create_monitored_items(params)
        mids = []
        # process result, add server_handle, or remove it if failed
        with self._lock:
            for idx, result in enumerate(results):
                mi = params.ItemsToCreate[idx]
                if not result.StatusCode.is_good():
                    del self._monitoreditems_map[mi.RequestedParameters.ClientHandle]
                    mids.append(result.StatusCode)
                    continue
                data = self._monitoreditems_map[mi.RequestedParameters.ClientHandle]
                data.server_handle = result.MonitoredItemId
                mids.append(result.MonitoredItemId)
        return mids

    def unsubscribe(self, handle):
        """
        unsubscribe to datachange or events using the handle returned while subscribing
        if you delete subscription, you do not need to unsubscribe
        """
        params = ua.DeleteMonitoredItemsParameters()
        params.SubscriptionId = self.subscription_id
        params.MonitoredItemIds = [handle]
        results = self.server.delete_monitored_items(params)
        results[0].check()
        with self._lock:
            for k, v in self._monitoreditems_map.items():
                if v.server_handle == handle:
                    del(self._monitoreditems_map[k])
                    return

    def modify_monitored_item(self, handle, new_samp_time, new_queuesize=0, mod_filter_val=-1):
        """
        Modify a monitored item.
        :param handle: Handle returned when originally subscribing
        :param new_samp_time: New wanted sample time
        :param new_queuesize: New wanted queuesize, default is 0
        :param mod_filter_val: New deadband filter value
        :return: Return a Modify Monitored Item Result
        """
        for monitored_item_index in self._monitoreditems_map:
            if self._monitoreditems_map[monitored_item_index].server_handle == handle:
                item_to_change = self._monitoreditems_map[monitored_item_index]
                break
        if mod_filter_val == None:
            mod_filter = None
        elif mod_filter_val < 0:
            mod_filter = item_to_change.mfilter
        else:
            mod_filter = ua.DataChangeFilter()
            mod_filter.Trigger = ua.DataChangeTrigger(1)  # send notification when status or value change
            mod_filter.DeadbandType = 1
            mod_filter.DeadbandValue = mod_filter_val  # absolute float value or from 0 to 100 for percentage deadband
        modif_item = ua.MonitoredItemModifyRequest()
        modif_item.MonitoredItemId = handle
        modif_item.RequestedParameters = self._modify_monitored_item_request(new_queuesize, new_samp_time,
                                                                             mod_filter)
        params = ua.ModifyMonitoredItemsParameters()
        params.SubscriptionId = self.subscription_id
        params.ItemsToModify.append(modif_item)
        results = self.server.modify_monitored_items(params)
        item_to_change.mfilter = results[0].FilterResult
        return results

    def _modify_monitored_item_request(self, new_queuesize, new_samp_time, mod_filter):
        req_params = ua.MonitoringParameters()
        with self._lock:
            req_params.ClientHandle = self._client_handle
        req_params.QueueSize = new_queuesize
        req_params.Filter = mod_filter
        req_params.SamplingInterval = new_samp_time
        return req_params

    def deadband_monitor(self, var, deadband_val, deadbandtype=1, queuesize=0, attr=ua.AttributeIds.Value):
        """
        Method to create a subscription with a Deadband Value.
        Default deadband value type is absolute.
        Return a handle which can be used to unsubscribe
        :param var: Variable to which you want to subscribe
        :param deadband_val: Absolute float value
        :param deadbandtype: Default value is 1 (absolute), change to 2 for percentage deadband
        :param queuesize: Wanted queue size, default is 1
        """
        deadband_filter = ua.DataChangeFilter()
        deadband_filter.Trigger = ua.DataChangeTrigger(1)  # send notification when status or value change
        deadband_filter.DeadbandType = deadbandtype
        deadband_filter.DeadbandValue = deadband_val  # absolute float value or from 0 to 100 for percentage deadband
        return self._subscribe(var, attr, deadband_filter, queuesize)


1		"""
2		high level interface to subscriptions
3		"""
4	1	import time
5	1	import logging
6	1	from threading import Lock
7
8	1	from opcua import ua
9	1	from opcua.common import events
10		from opcua import Node
11
12	1
13		class SubHandler(object):
14		"""
15		Subscription Handler. To receive events from server for a subscription
16		This class is just a sample class. Whatever class having these methods can be used
17		"""
18	1
19		def data_change(self, handle, node, val, attr):
20		"""
21		Deprecated, use datachange_notification
22		"""
23		pass
24	1
25		def datachange_notification(self, node, val, data):
26		"""
27		called for every datachange notification from server
28		"""
29		pass
30	1
31		def event_notification(self, event):
32		"""
33		called for every event notification from server
34		"""
35		pass
36	1
37		def status_change_notification(self, status):
38		"""
39		called for every status change notification from server
40		"""
41		pass
42
43	1
44		class SubscriptionItemData(object):
45		"""
46		To store useful data from a monitored item
47		"""
48	1	def __init__(self):
49	1	self.node = None
50		self.client_handle = None
51	1	self.server_handle = None
52		self.attribute = None
53	1	self.mfilter = None
54
55	1
56		class DataChangeNotif(object):
57		"""
58		To be send to clients for every datachange notification from server
59	1	"""
60	1	def __init__(self, subscription_data, monitored_item):
61	1	self.monitored_item = monitored_item
62	1	self.subscription_data = subscription_data
63	1
64		def __str__(self):
65		return "DataChangeNotification({}, {})".format(self.subscription_data, self.monitored_item)
66	1	__repr__ = __str__
67
68
69		class Subscription(object):
70	1	"""
71	1	Subscription object returned by Server or Client objects.
72	1	The object represent a subscription to an opc-ua server.
73	1	This is a high level class, especially subscribe_data_change
74	1	and subscribe_events methods. If more control is necessary look at
75	1	code and/or use create_monitored_items method.
76		"""
77
78	1	def __init__(self, server, params, handler):
79		self.logger = logging.getLogger(__name__)
80		self.server = server
81		self._client_handle = 200
82	1	self._handler = handler
83	1	self.parameters = params # move to data class
84	1	self._monitoreditems_map = {}
85		self._lock = Lock()
86	1	self.subscription_id = None
87		response = self.server.create_subscription(params, self.publish_callback)
88	1	self.subscription_id = response.SubscriptionId # move to data class
89		self.server.publish()
90		self.server.publish()
91	1
92		def delete(self):
93		"""
94		Delete subscription on server. This is automatically done by Client and Server classes on exit
95		"""
96		results = self.server.delete_subscriptions([self.subscription_id])
97		results[0].check()
98
99		def publish_callback(self, publishresult):
100	1	self.logger.info("Publish callback called with result: %s", publishresult)
101	1	while self.subscription_id is None:
102	1	time.sleep(0.01)
103	1
104	1	for notif in publishresult.NotificationMessage.NotificationData:
105	1	if isinstance(notif, ua.DataChangeNotification):
106	1	self._call_datachange(notif)
107	1	elif isinstance(notif, ua.EventNotificationList):
108	1	self._call_event(notif)
109	1	elif isinstance(notif, ua.StatusChangeNotification):
110	1	self._call_status(notif)
111	1	else:
112	1	self.logger.warning("Notification type not supported yet for notification %s", notif)
113
114	1	ack = ua.SubscriptionAcknowledgement()
115		ack.SubscriptionId = self.subscription_id
116		ack.SequenceNumber = publishresult.NotificationMessage.SequenceNumber
117		self.server.publish([ack])
118	1
119	1	def _call_datachange(self, datachange):
120		for item in datachange.MonitoredItems:
121	1	with self._lock:
122	1	if item.ClientHandle not in self._monitoreditems_map:
123	1	self.logger.warning("Received a notification for unknown handle: %s", item.ClientHandle)
124	1	continue
125		data = self._monitoreditems_map[item.ClientHandle]
126	1	if hasattr(self._handler, "datachange_notification"):
127	1	event_data = DataChangeNotif(data, item)
128	1	try:
129	1	self._handler.datachange_notification(data.node, item.Value.Value.Value, event_data)
130	1	except Exception:
131		self.logger.exception("Exception calling data change handler")
132		elif hasattr(self._handler, "data_change"): # deprecated API
133		self.logger.warning("data_change method is deprecated, use datachange_notification")
134		try:
135		self._handler.data_change(data.server_handle, data.node, item.Value.Value.Value, data.attribute)
136	1	except Exception:
137	1	self.logger.exception("Exception calling deprecated data change handler")
138	1	else:
139	1	self.logger.error("DataChange subscription created but handler has no datachange_notification method")
140
141	1	def _call_event(self, eventlist):
142	1	for event in eventlist.Events:
143	1	with self._lock:
144	1	data = self._monitoreditems_map[event.ClientHandle]
145		result = events.Event.from_event_fields(data.mfilter.SelectClauses, event.EventFields)
146		result.server_handle = data.server_handle
147	1	if hasattr(self._handler, "event_notification"):
148	1	try:
149	1	self._handler.event_notification(result)
150	1	except Exception:
151	1	self.logger.exception("Exception calling event handler")
152		elif hasattr(self._handler, "event"): # depcrecated API
153		try:
154	1	self._handler.event(data.server_handle, result)
155	1	except Exception:
156	1	self.logger.exception("Exception calling deprecated event handler")
157	1	else:
158		self.logger.error("Event subscription created but handler has no event_notification method")
159
160		def _call_status(self, status):
161		try:
162		self._handler.status_change_notification(status.Status)
163	1	except Exception:
164	1	self.logger.exception("Exception calling status change handler")
165	1
166	1	def subscribe_data_change(self, nodes, attr=ua.AttributeIds.Value):
167	1	"""
168	1	Subscribe for data change events for a node or list of nodes.
169	1	default attribute is Value.
170	1	Return a handle which can be used to unsubscribe
171		If more control is necessary use create_monitored_items method
172		"""
173	1	return self._subscribe(nodes, attr, queuesize=0)
174	1
175	1	def subscribe_events(self, sourcenode=ua.ObjectIds.Server, evtypes=ua.ObjectIds.BaseEventType, evfilter=None):
176	1	"""
177		Subscribe to events from a node. Default node is Server node.
178		In most servers the server node is the only one you can subscribe to.
179		if evtypes is not provided, evtype defaults to BaseEventType
180		if evtypes is a list or tuple of custom event types, the events will be filtered to the supplied types
181		Return a handle which can be used to unsubscribe
182		"""
183		sourcenode = Node(self.server, sourcenode)
184
185		if evfilter is None:
186		if not type(evtypes) in (list, tuple):
187	1	evtypes = [evtypes]
188
189		evtypes = [Node(self.server, evtype) for evtype in evtypes]
190
191		evfilter = events.get_filter_from_event_type(evtypes)
192		return self._subscribe(sourcenode, ua.AttributeIds.EventNotifier, evfilter)
193	1
194		def _subscribe(self, nodes, attr, mfilter=None, queuesize=0):
195		is_list = True
196		if not type(nodes) in (list, tuple):
197		is_list = False
198		nodes = [nodes]
199		mirs = []
200	1	for node in nodes:
201		mir = self._make_monitored_item_request(node, attr, mfilter, queuesize)
202	1	mirs.append(mir)
203	1
204		mids = self.create_monitored_items(mirs)
205	1	if is_list:
206	1	return mids
207		if type(mids[0]) == ua.StatusCode:
208	1	mids[0].check()
209	1	return mids[0]
210
211	1	def _make_monitored_item_request(self, node, attr, mfilter, queuesize):
212	1	rv = ua.ReadValueId()
213	1	rv.NodeId = node.nodeid
214	1	rv.AttributeId = attr
215	1	# rv.IndexRange //We leave it null, then the entire array is returned
216	1	mparams = ua.MonitoringParameters()
217	1	with self._lock:
218	1	self._client_handle += 1
219	1	mparams.ClientHandle = self._client_handle
220	1	mparams.SamplingInterval = self.parameters.RequestedPublishingInterval
221		mparams.QueueSize = queuesize
222	1	mparams.DiscardOldest = True
223		if mfilter:
224		mparams.Filter = mfilter
225		mir = ua.MonitoredItemCreateRequest()
226		mir.ItemToMonitor = rv
227		mir.MonitoringMode = ua.MonitoringMode.Reporting
228	1	mir.RequestedParameters = mparams
229	1	return mir
230	1
231		def create_monitored_items(self, monitored_items):
232	1	"""
233	1	low level method to have full control over subscription parameters
234	1	Client handle must be unique since it will be used as key for internal registration of data
235	1	"""
236	1	params = ua.CreateMonitoredItemsParameters()
237	1	params.SubscriptionId = self.subscription_id
238	1	params.ItemsToCreate = monitored_items
239	1	params.TimestampsToReturn = ua.TimestampsToReturn.Neither
240	1
241		# insert monitored item into map to avoid notification arrive before result return
242	1	# server_handle is left as None in purpose as we don't get it yet.
243	1	with self._lock:
244	1	for mi in monitored_items:
245	1	data = SubscriptionItemData()
246	1	data.client_handle = mi.RequestedParameters.ClientHandle
247	1	data.node = Node(self.server, mi.ItemToMonitor.NodeId)
248		data.attribute = mi.ItemToMonitor.AttributeId
249	1	#TODO: Either use the filter from request or from response. Here it uses from request, in modify it uses from response
250	1	data.mfilter = mi.RequestedParameters.Filter
251	1	self._monitoreditems_map[mi.RequestedParameters.ClientHandle] = data
252	1	results = self.server.create_monitored_items(params)
253		mids = []
254	1	# process result, add server_handle, or remove it if failed
255	1	with self._lock:
256	1	for idx, result in enumerate(results):
257	1	mi = params.ItemsToCreate[idx]
258	1	if not result.StatusCode.is_good():
259	1	del self._monitoreditems_map[mi.RequestedParameters.ClientHandle]
260	1	mids.append(result.StatusCode)
261	1	continue
262	1	data = self._monitoreditems_map[mi.RequestedParameters.ClientHandle]
263	1	data.server_handle = result.MonitoredItemId
264	1	mids.append(result.MonitoredItemId)
265	1	return mids
266	1
267	1	def unsubscribe(self, handle):
268		"""
269	1	unsubscribe to datachange or events using the handle returned while subscribing
270		if you delete subscription, you do not need to unsubscribe
271		"""
272		params = ua.DeleteMonitoredItemsParameters()
273		params.SubscriptionId = self.subscription_id
274	1	params.MonitoredItemIds = [handle]
275	1	results = self.server.delete_monitored_items(params)
276	1	results[0].check()
277	1	with self._lock:
278		for k, v in self._monitoreditems_map.items():
279		if v.server_handle == handle:
280		del(self._monitoreditems_map[k])
281	1	return
282	1
283	1	def modify_monitored_item(self, handle, new_samp_time, new_queuesize=0, mod_filter_val=-1):
284	1	"""
285	1	Modify a monitored item.
286	1	:param handle: Handle returned when originally subscribing
287	1	:param new_samp_time: New wanted sample time
288	1	:param new_queuesize: New wanted queuesize, default is 0
289	1	:param mod_filter_val: New deadband filter value
290	1	:return: Return a Modify Monitored Item Result
291		"""
292	1	for monitored_item_index in self._monitoreditems_map:
293	1	if self._monitoreditems_map[monitored_item_index].server_handle == handle:
294	1	item_to_change = self._monitoreditems_map[monitored_item_index]
295	1	break
296	1	if mod_filter_val == None:
297	1	mod_filter = None
298	1	elif mod_filter_val < 0:
299	1	mod_filter = item_to_change.mfilter
300	1	else:
301	1	mod_filter = ua.DataChangeFilter()
302	1	mod_filter.Trigger = ua.DataChangeTrigger(1) # send notification when status or value change
303		mod_filter.DeadbandType = 1
304	1	mod_filter.DeadbandValue = mod_filter_val # absolute float value or from 0 to 100 for percentage deadband
305		modif_item = ua.MonitoredItemModifyRequest()
306		modif_item.MonitoredItemId = handle
307		modif_item.RequestedParameters = self._modify_monitored_item_request(new_queuesize, new_samp_time,
308		mod_filter)
309	1	params = ua.ModifyMonitoredItemsParameters()
310	1	params.SubscriptionId = self.subscription_id
311	1	params.ItemsToModify.append(modif_item)
312	1	results = self.server.modify_monitored_items(params)
313	1	item_to_change.mfilter = results[0].FilterResult
314	1	return results
315	1
316	1	def _modify_monitored_item_request(self, new_queuesize, new_samp_time, mod_filter):
317	1	req_params = ua.MonitoringParameters()
318	1	with self._lock:
319		req_params.ClientHandle = self._client_handle
320		req_params.QueueSize = new_queuesize
321	1	req_params.Filter = mod_filter
322	1	req_params.SamplingInterval = new_samp_time
323	1	return req_params
324
325	1	def deadband_monitor(self, var, deadband_val, deadbandtype=1, queuesize=0, attr=ua.AttributeIds.Value):
326	1	"""
327		Method to create a subscription with a Deadband Value.
328	1	Default deadband value type is absolute.
329	1	Return a handle which can be used to unsubscribe
330		:param var: Variable to which you want to subscribe
331	1	:param deadband_val: Absolute float value
332	1	:param deadbandtype: Default value is 1 (absolute), change to 2 for percentage deadband
333		:param queuesize: Wanted queue size, default is 1
334	1	"""
335		deadband_filter = ua.DataChangeFilter()
336	1	deadband_filter.Trigger = ua.DataChangeTrigger(1) # send notification when status or value change
337		deadband_filter.DeadbandType = deadbandtype
338		deadband_filter.DeadbandValue = deadband_val # absolute float value or from 0 to 100 for percentage deadband
339		return self._subscribe(var, attr, deadband_filter, queuesize)
340

FreeOpcUa / python-opcua

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