asyncua.server.monitored_item_service.MonitoredItemService.datachange_callback() - Code Metrics - Inspection of "Refactored Subscription" - FreeOpcUa/opcua-asyncio - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#45)

unknown

created 2019-05-01 11:34 UTC

MonitoredItemService.datachange_callback() A

↳ Parent: asyncua.server.monitored_item_service

Complexity

Conditions

Size

Total Lines	20
Code Lines	18

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	4
eloc	18
nop	4
dl	0
loc	20
rs	9.5
c	0
b	0
f	0

"""
server side implementation of a subscription object
"""

import logging
from asyncua import ua


class MonitoredItemData:
    def __init__(self):
        self.client_handle = None
        self.callback_handle = None
        self.monitored_item_id = None
        self.mode = None
        self.filter = None
        self.mvalue = MonitoredItemValues()
        self.where_clause_evaluator = None
        self.queue_size = 0


class MonitoredItemValues:
    def __init__(self):
        self.current_value = None
        self.old_value = None

    def set_current_value(self, cur_val):
        self.old_value = self.current_value
        self.current_value = cur_val

    def get_current_value(self):
        return self.current_value

    def get_old_value(self):
        return self.old_value


class MonitoredItemService:
    """
    Implements monitored item service for one subscription
    """

    def __init__(self, isub, aspace):
        self.logger = logging.getLogger(f"{__name__}.{isub.data.SubscriptionId}")
        self.isub = isub
        self.aspace = aspace
        self._monitored_items = {}
        self._monitored_events = {}
        self._monitored_datachange = {}
        self._monitored_item_counter = 111

    def __str__(self):
        return f"MonitoredItemService({self.isub.data.SubscriptionId})"

    def delete_all_monitored_items(self):
        self.delete_monitored_items([mdata.monitored_item_id for mdata in self._monitored_items.values()])

    async def create_monitored_items(self, params):
        results = []
        for item in params.ItemsToCreate:
            # with self._lock:
            if item.ItemToMonitor.AttributeId == ua.AttributeIds.EventNotifier:
                result = self._create_events_monitored_item(item)
            else:
                result = self._create_data_change_monitored_item(item)
            results.append(result)
        return results

    def modify_monitored_items(self, params):
        results = []
        for item in params.ItemsToModify:
            results.append(self._modify_monitored_item(item))
        return results

    def trigger_datachange(self, handle, nodeid, attr):
        self.logger.debug("triggering datachange for handle %s, nodeid %s, and attribute %s", handle, nodeid, attr)
        variant = self.aspace.get_attribute_value(nodeid, attr)
        self.datachange_callback(handle, variant)

    def _modify_monitored_item(self, params):
        for mdata in self._monitored_items.values():
            result = ua.MonitoredItemModifyResult()
            if mdata.monitored_item_id == params.MonitoredItemId:
                result.RevisedSamplingInterval = params.RequestedParameters.SamplingInterval
                result.RevisedQueueSize = params.RequestedParameters.QueueSize
                if params.RequestedParameters.Filter is not None:
                    mdata.filter = params.RequestedParameters.Filter
                mdata.queue_size = params.RequestedParameters.QueueSize
                return result
        result = ua.MonitoredItemModifyResult()
        result.StatusCode(ua.StatusCodes.BadMonitoredItemIdInvalid)
        return result

    def _commit_monitored_item(self, result, mdata):
        if result.StatusCode.is_good():
            self._monitored_items[result.MonitoredItemId] = mdata
            self._monitored_item_counter += 1

    def _make_monitored_item_common(self, params):
        result = ua.MonitoredItemCreateResult()
        result.RevisedSamplingInterval = self.isub.data.RevisedPublishingInterval
        result.RevisedQueueSize = params.RequestedParameters.QueueSize
        self._monitored_item_counter += 1
        result.MonitoredItemId = self._monitored_item_counter
        self.logger.debug("Creating MonitoredItem with id %s", result.MonitoredItemId)

        mdata = MonitoredItemData()
        mdata.mode = params.MonitoringMode
        mdata.client_handle = params.RequestedParameters.ClientHandle
        mdata.monitored_item_id = result.MonitoredItemId
        mdata.queue_size = params.RequestedParameters.QueueSize
        mdata.filter = params.RequestedParameters.Filter

        return result, mdata

    def _create_events_monitored_item(self, params):
        self.logger.info("request to subscribe to events for node %s and attribute %s", params.ItemToMonitor.NodeId,
                         params.ItemToMonitor.AttributeId)

        result, mdata = self._make_monitored_item_common(params)
        ev_notify_byte = self.aspace.get_attribute_value(params.ItemToMonitor.NodeId,
                                                         ua.AttributeIds.EventNotifier).Value.Value

        if ev_notify_byte is None or not ua.ua_binary.test_bit(ev_notify_byte, ua.EventNotifier.SubscribeToEvents):
            result.StatusCode = ua.StatusCode(ua.StatusCodes.BadServiceUnsupported)
            return result
        # result.FilterResult = ua.EventFilterResult()  # spec says we can ignore if not error
        mdata.where_clause_evaluator = WhereClauseEvaluator(self.logger, self.aspace, mdata.filter.WhereClause)
        self._commit_monitored_item(result, mdata)
        if params.ItemToMonitor.NodeId not in self._monitored_events:
            self._monitored_events[params.ItemToMonitor.NodeId] = []
        self._monitored_events[params.ItemToMonitor.NodeId].append(result.MonitoredItemId)
        return result

    def _create_data_change_monitored_item(self, params):
        self.logger.info("request to subscribe to datachange for node %s and attribute %s", params.ItemToMonitor.NodeId,
                         params.ItemToMonitor.AttributeId)

        result, mdata = self._make_monitored_item_common(params)
        result.FilterResult = params.RequestedParameters.Filter
        result.StatusCode, handle = self.aspace.add_datachange_callback(
            params.ItemToMonitor.NodeId, params.ItemToMonitor.AttributeId, self.datachange_callback)

        self.logger.debug("adding callback return status %s and handle %s", result.StatusCode, handle)
        mdata.callback_handle = handle
        self._commit_monitored_item(result, mdata)
        if result.StatusCode.is_good():
            self._monitored_datachange[handle] = result.MonitoredItemId
            # force data change event generation
            self.trigger_datachange(handle, params.ItemToMonitor.NodeId, params.ItemToMonitor.AttributeId)
        return result

    def delete_monitored_items(self, ids):
        self.logger.debug("delete monitored items %s", ids)
        # with self._lock:
        results = []
        for mid in ids:
            results.append(self._delete_monitored_items(mid))
        return results

    def _delete_monitored_items(self, mid):
        if mid not in self._monitored_items:
            return ua.StatusCode(ua.StatusCodes.BadMonitoredItemIdInvalid)
        for k, v in self._monitored_events.items():
            if mid in v:
                v.remove(mid)
                if not v:
                    self._monitored_events.pop(k)
                break
        for k, v in self._monitored_datachange.items():
            if v == mid:
                self.aspace.delete_datachange_callback(k)
                self._monitored_datachange.pop(k)
                break
        self._monitored_items.pop(mid)
        return ua.StatusCode()

    def datachange_callback(self, handle, value, error=None):
        if error:
            self.logger.info("subscription %s: datachange callback called with handle '%s' and error '%s'", self,
                             handle, error)
            self.trigger_statuschange(error)
        else:
            self.logger.info("subscription %s: datachange callback called with handle '%s' and value '%s'", self,
                             handle, value.Value)
            event = ua.MonitoredItemNotification()
            mid = self._monitored_datachange[handle]
            mdata = self._monitored_items[mid]
            mdata.mvalue.set_current_value(value.Value.Value)
            if mdata.filter:
                deadband_flag_pass = self.deadband_callback(mdata.mvalue, mdata.filter)
            else:
                deadband_flag_pass = True
            if deadband_flag_pass:
                event.ClientHandle = mdata.client_handle
                event.Value = value
                self.isub.enqueue_datachange_event(mid, event, mdata.queue_size)

    def deadband_callback(self, values, flt):
        if flt.DeadbandType == ua.DeadbandType.None_ or values.get_old_value() is None:
            return True
        if flt.DeadbandType == ua.DeadbandType.Absolute and \
                ((abs(values.get_current_value() - values.get_old_value())) > flt.DeadbandValue):
            return True
        if flt.DeadbandType == ua.DeadbandType.Percent:
            self.logger.warning("DeadbandType Percent is not implemented !")
            return True
        return False

    def trigger_event(self, event):
        if event.emitting_node not in self._monitored_events:
            self.logger.debug("%s has no subscription for events %s from node: %s", self, event, event.emitting_node)
            return False
        self.logger.debug("%s has subscription for events %s from node: %s", self, event, event.emitting_node)
        mids = self._monitored_events[event.emitting_node]
        for mid in mids:
            self._trigger_event(event, mid)
        return True

    def _trigger_event(self, event, mid):
        if mid not in self._monitored_items:
            self.logger.debug("Could not find monitored items for id %s for event %s in subscription %s", mid, event,
                              self)
            return
        mdata = self._monitored_items[mid]
        if not mdata.where_clause_evaluator.eval(event):
            self.logger.info("%s, %s, Event %s does not fit WhereClause, not generating event", self, mid, event)
            return
        fieldlist = ua.EventFieldList()
        fieldlist.ClientHandle = mdata.client_handle
        fieldlist.EventFields = event.to_event_fields(mdata.filter.SelectClauses)
        self.isub.enqueue_event(mid, fieldlist, mdata.queue_size)

    def trigger_statuschange(self, code):
        self.isub.enqueue_statuschange(code)


class WhereClauseEvaluator:
    def __init__(self, logger, aspace, whereclause):
        self.logger = logger
        self.elements = whereclause.Elements
        self._aspace = aspace

    def eval(self, event):
        if not self.elements:
            return True
        # spec says we should only evaluate first element, which may use other elements
        try:
            res = self._eval_el(0, event)
        except Exception as ex:
            self.logger.exception("Exception while evaluating WhereClause %s for event %s: %s", self.elements, event,
                                  ex)
            return False
        return res

    def _eval_el(self, index, event):
        el = self.elements[index]
        # ops = [self._eval_op(op, event) for op in el.FilterOperands]
        ops = el.FilterOperands  # just to make code more readable
        if el.FilterOperator == ua.FilterOperator.Equals:
            return self._eval_op(ops[0], event) == self._eval_el(ops[1], event)
        if el.FilterOperator == ua.FilterOperator.IsNull:
            return self._eval_op(ops[0], event) is None  # FIXME: might be too strict
        if el.FilterOperator == ua.FilterOperator.GreaterThan:
            return self._eval_op(ops[0], event) > self._eval_el(ops[1], event)
        if el.FilterOperator == ua.FilterOperator.LessThan:
            return self._eval_op(ops[0], event) < self._eval_el(ops[1], event)
        if el.FilterOperator == ua.FilterOperator.GreaterThanOrEqual:
            return self._eval_op(ops[0], event) >= self._eval_el(ops[1], event)
        if el.FilterOperator == ua.FilterOperator.LessThanOrEqual:
            return self._eval_op(ops[0], event) <= self._eval_el(ops[1], event)
        if el.FilterOperator == ua.FilterOperator.Like:
            return self._like_operator(self._eval_op(ops[0], event), self._eval_el(ops[1], event))
        if el.FilterOperator == ua.FilterOperator.Not:
            return not self._eval_op(ops[0], event)
        if el.FilterOperator == ua.FilterOperator.Between:
            return self._eval_el(ops[2], event) >= self._eval_op(ops[0], event) >= self._eval_el(ops[1], event)
        if el.FilterOperator == ua.FilterOperator.InList:
            return self._eval_op(ops[0], event) in [self._eval_op(op, event) for op in ops[1:]]
        if el.FilterOperator == ua.FilterOperator.And:
            self.elements(ops[0].Index)
            return self._eval_op(ops[0], event) and self._eval_op(ops[1], event)
        if el.FilterOperator == ua.FilterOperator.Or:
            return self._eval_op(ops[0], event) or self._eval_el(ops[1], event)
        if el.FilterOperator == ua.FilterOperator.Cast:
            self.logger.warn("Cast operand not implemented, assuming True")
            return True
        if el.FilterOperator == ua.FilterOperator.OfType:
            return event.EventType == self._eval_op(ops[0], event)
        # TODO: implement missing operators
        self.logger.warning("WhereClause not implemented for element: %s", el)
        raise NotImplementedError

    def _like_operator(self, string, pattern):
        raise NotImplementedError

    def _eval_op(self, op, event):
        # seems spec says we should return Null if issues
        if isinstance(op, ua.ElementOperand):
            return self._eval_el(op.Index, event)
        if isinstance(op, ua.AttributeOperand):
            if op.BrowsePath:
                return getattr(event, op.BrowsePath.Elements[0].TargetName.Name)
            return self._aspace.get_attribute_value(event.EventType, op.AttributeId).Value.Value
            # FIXME: check, this is probably broken
        if isinstance(op, ua.SimpleAttributeOperand):
            if op.BrowsePath:
                # we only support depth of 1
                return getattr(event, op.BrowsePath[0].Name)
            # TODO: write code for index range.... but doe it make any sense
            return self._aspace.get_attribute_value(event.EventType, op.AttributeId).Value.Value
        if isinstance(op, ua.LiteralOperand):
            return op.Value.Value
        self.logger.warning("Where clause element % is not of a known type", op)
        raise NotImplementedError


1			"""
2			server side implementation of a subscription object
3			"""
4
5			import logging
6			from asyncua import ua
7
8
9			class MonitoredItemData:
10			def __init__(self):
11			self.client_handle = None
12			self.callback_handle = None
13			self.monitored_item_id = None
14			self.mode = None
15			self.filter = None
16			self.mvalue = MonitoredItemValues()
17			self.where_clause_evaluator = None
18			self.queue_size = 0
19
20
21			class MonitoredItemValues:
22			def __init__(self):
23			self.current_value = None
24			self.old_value = None
25
26			def set_current_value(self, cur_val):
27			self.old_value = self.current_value
28			self.current_value = cur_val
29
30			def get_current_value(self):
31			return self.current_value
32
33			def get_old_value(self):
34			return self.old_value
35
36
37			class MonitoredItemService:
38			"""
39			Implements monitored item service for one subscription
40			"""
41
42			def __init__(self, isub, aspace):
43			self.logger = logging.getLogger(f"{__name__}.{isub.data.SubscriptionId}")
44			self.isub = isub
45			self.aspace = aspace
46			self._monitored_items = {}
47			self._monitored_events = {}
48			self._monitored_datachange = {}
49			self._monitored_item_counter = 111
50
51			def __str__(self):
52			return f"MonitoredItemService({self.isub.data.SubscriptionId})"
53
54			def delete_all_monitored_items(self):
55			self.delete_monitored_items([mdata.monitored_item_id for mdata in self._monitored_items.values()])
56
57			async def create_monitored_items(self, params):
58			results = []
59			for item in params.ItemsToCreate:
60			# with self._lock:
61			if item.ItemToMonitor.AttributeId == ua.AttributeIds.EventNotifier:
62			result = self._create_events_monitored_item(item)
63			else:
64			result = self._create_data_change_monitored_item(item)
65			results.append(result)
66			return results
67
68			def modify_monitored_items(self, params):
69			results = []
70			for item in params.ItemsToModify:
71			results.append(self._modify_monitored_item(item))
72			return results
73
74			def trigger_datachange(self, handle, nodeid, attr):
75			self.logger.debug("triggering datachange for handle %s, nodeid %s, and attribute %s", handle, nodeid, attr)
76			variant = self.aspace.get_attribute_value(nodeid, attr)
77			self.datachange_callback(handle, variant)
78
79			def _modify_monitored_item(self, params):
80			for mdata in self._monitored_items.values():
81			result = ua.MonitoredItemModifyResult()
82			if mdata.monitored_item_id == params.MonitoredItemId:
83			result.RevisedSamplingInterval = params.RequestedParameters.SamplingInterval
84			result.RevisedQueueSize = params.RequestedParameters.QueueSize
85			if params.RequestedParameters.Filter is not None:
86			mdata.filter = params.RequestedParameters.Filter
87			mdata.queue_size = params.RequestedParameters.QueueSize
88			return result
89			result = ua.MonitoredItemModifyResult()
90			result.StatusCode(ua.StatusCodes.BadMonitoredItemIdInvalid)
91			return result
92
93			def _commit_monitored_item(self, result, mdata):
94			if result.StatusCode.is_good():
95			self._monitored_items[result.MonitoredItemId] = mdata
96			self._monitored_item_counter += 1
97
98			def _make_monitored_item_common(self, params):
99			result = ua.MonitoredItemCreateResult()
100			result.RevisedSamplingInterval = self.isub.data.RevisedPublishingInterval
101			result.RevisedQueueSize = params.RequestedParameters.QueueSize
102			self._monitored_item_counter += 1
103			result.MonitoredItemId = self._monitored_item_counter
104			self.logger.debug("Creating MonitoredItem with id %s", result.MonitoredItemId)
105
106			mdata = MonitoredItemData()
107			mdata.mode = params.MonitoringMode
108			mdata.client_handle = params.RequestedParameters.ClientHandle
109			mdata.monitored_item_id = result.MonitoredItemId
110			mdata.queue_size = params.RequestedParameters.QueueSize
111			mdata.filter = params.RequestedParameters.Filter
112
113			return result, mdata
114
115			def _create_events_monitored_item(self, params):
116			self.logger.info("request to subscribe to events for node %s and attribute %s", params.ItemToMonitor.NodeId,
117			params.ItemToMonitor.AttributeId)
118
119			result, mdata = self._make_monitored_item_common(params)
120			ev_notify_byte = self.aspace.get_attribute_value(params.ItemToMonitor.NodeId,
121			ua.AttributeIds.EventNotifier).Value.Value
122
123			if ev_notify_byte is None or not ua.ua_binary.test_bit(ev_notify_byte, ua.EventNotifier.SubscribeToEvents):
124			result.StatusCode = ua.StatusCode(ua.StatusCodes.BadServiceUnsupported)
125			return result
126			# result.FilterResult = ua.EventFilterResult() # spec says we can ignore if not error
127			mdata.where_clause_evaluator = WhereClauseEvaluator(self.logger, self.aspace, mdata.filter.WhereClause)
128			self._commit_monitored_item(result, mdata)
129			if params.ItemToMonitor.NodeId not in self._monitored_events:
130			self._monitored_events[params.ItemToMonitor.NodeId] = []
131			self._monitored_events[params.ItemToMonitor.NodeId].append(result.MonitoredItemId)
132			return result
133
134			def _create_data_change_monitored_item(self, params):
135			self.logger.info("request to subscribe to datachange for node %s and attribute %s", params.ItemToMonitor.NodeId,
136			params.ItemToMonitor.AttributeId)
137
138			result, mdata = self._make_monitored_item_common(params)
139			result.FilterResult = params.RequestedParameters.Filter
140			result.StatusCode, handle = self.aspace.add_datachange_callback(
141			params.ItemToMonitor.NodeId, params.ItemToMonitor.AttributeId, self.datachange_callback)
142
143			self.logger.debug("adding callback return status %s and handle %s", result.StatusCode, handle)
144			mdata.callback_handle = handle
145			self._commit_monitored_item(result, mdata)
146			if result.StatusCode.is_good():
147			self._monitored_datachange[handle] = result.MonitoredItemId
148			# force data change event generation
149			self.trigger_datachange(handle, params.ItemToMonitor.NodeId, params.ItemToMonitor.AttributeId)
150			return result
151
152			def delete_monitored_items(self, ids):
153			self.logger.debug("delete monitored items %s", ids)
154			# with self._lock:
155			results = []
156			for mid in ids:
157			results.append(self._delete_monitored_items(mid))
158			return results
159
160			def _delete_monitored_items(self, mid):
161			if mid not in self._monitored_items:
162			return ua.StatusCode(ua.StatusCodes.BadMonitoredItemIdInvalid)
163			for k, v in self._monitored_events.items():
164			if mid in v:
165			v.remove(mid)
166			if not v:
167			self._monitored_events.pop(k)
168			break
169			for k, v in self._monitored_datachange.items():
170			if v == mid:
171			self.aspace.delete_datachange_callback(k)
172			self._monitored_datachange.pop(k)
173			break
174			self._monitored_items.pop(mid)
175			return ua.StatusCode()
176
177			def datachange_callback(self, handle, value, error=None):
178			if error:
179			self.logger.info("subscription %s: datachange callback called with handle '%s' and error '%s'", self,
180			handle, error)
181			self.trigger_statuschange(error)
182			else:
183			self.logger.info("subscription %s: datachange callback called with handle '%s' and value '%s'", self,
184			handle, value.Value)
185			event = ua.MonitoredItemNotification()
186			mid = self._monitored_datachange[handle]
187			mdata = self._monitored_items[mid]
188			mdata.mvalue.set_current_value(value.Value.Value)
189			if mdata.filter:
190			deadband_flag_pass = self.deadband_callback(mdata.mvalue, mdata.filter)
191			else:
192			deadband_flag_pass = True
193			if deadband_flag_pass:
194			event.ClientHandle = mdata.client_handle
195			event.Value = value
196			self.isub.enqueue_datachange_event(mid, event, mdata.queue_size)
197
198			def deadband_callback(self, values, flt):
199			if flt.DeadbandType == ua.DeadbandType.None_ or values.get_old_value() is None:
200			return True
201			if flt.DeadbandType == ua.DeadbandType.Absolute and \
202			((abs(values.get_current_value() - values.get_old_value())) > flt.DeadbandValue):
203			return True
204			if flt.DeadbandType == ua.DeadbandType.Percent:
205			self.logger.warning("DeadbandType Percent is not implemented !")
206			return True
207			return False
208
209			def trigger_event(self, event):
210			if event.emitting_node not in self._monitored_events:
211			self.logger.debug("%s has no subscription for events %s from node: %s", self, event, event.emitting_node)
212			return False
213			self.logger.debug("%s has subscription for events %s from node: %s", self, event, event.emitting_node)
214			mids = self._monitored_events[event.emitting_node]
215			for mid in mids:
216			self._trigger_event(event, mid)
217			return True
218
219			def _trigger_event(self, event, mid):
220			if mid not in self._monitored_items:
221			self.logger.debug("Could not find monitored items for id %s for event %s in subscription %s", mid, event,
222			self)
223			return
224			mdata = self._monitored_items[mid]
225			if not mdata.where_clause_evaluator.eval(event):
226			self.logger.info("%s, %s, Event %s does not fit WhereClause, not generating event", self, mid, event)
227			return
228			fieldlist = ua.EventFieldList()
229			fieldlist.ClientHandle = mdata.client_handle
230			fieldlist.EventFields = event.to_event_fields(mdata.filter.SelectClauses)
231			self.isub.enqueue_event(mid, fieldlist, mdata.queue_size)
232
233			def trigger_statuschange(self, code):
234			self.isub.enqueue_statuschange(code)
235
236
237			class WhereClauseEvaluator:
238			def __init__(self, logger, aspace, whereclause):
239			self.logger = logger
240			self.elements = whereclause.Elements
241			self._aspace = aspace
242
243			def eval(self, event):
244			if not self.elements:
245			return True
246			# spec says we should only evaluate first element, which may use other elements
247			try:
248			res = self._eval_el(0, event)
249			except Exception as ex:
250			self.logger.exception("Exception while evaluating WhereClause %s for event %s: %s", self.elements, event,
251			ex)
252			return False
253			return res
254
255			def _eval_el(self, index, event):
256			el = self.elements[index]
257			# ops = [self._eval_op(op, event) for op in el.FilterOperands]
258			ops = el.FilterOperands # just to make code more readable
259			if el.FilterOperator == ua.FilterOperator.Equals:
260			return self._eval_op(ops[0], event) == self._eval_el(ops[1], event)
261			if el.FilterOperator == ua.FilterOperator.IsNull:
262			return self._eval_op(ops[0], event) is None # FIXME: might be too strict
263			if el.FilterOperator == ua.FilterOperator.GreaterThan:
264			return self._eval_op(ops[0], event) > self._eval_el(ops[1], event)
265			if el.FilterOperator == ua.FilterOperator.LessThan:
266			return self._eval_op(ops[0], event) < self._eval_el(ops[1], event)
267			if el.FilterOperator == ua.FilterOperator.GreaterThanOrEqual:
268			return self._eval_op(ops[0], event) >= self._eval_el(ops[1], event)
269			if el.FilterOperator == ua.FilterOperator.LessThanOrEqual:
270			return self._eval_op(ops[0], event) <= self._eval_el(ops[1], event)
271			if el.FilterOperator == ua.FilterOperator.Like:
272			return self._like_operator(self._eval_op(ops[0], event), self._eval_el(ops[1], event))
273			if el.FilterOperator == ua.FilterOperator.Not:
274			return not self._eval_op(ops[0], event)
275			if el.FilterOperator == ua.FilterOperator.Between:
276			return self._eval_el(ops[2], event) >= self._eval_op(ops[0], event) >= self._eval_el(ops[1], event)
277			if el.FilterOperator == ua.FilterOperator.InList:
278			return self._eval_op(ops[0], event) in [self._eval_op(op, event) for op in ops[1:]]
279			if el.FilterOperator == ua.FilterOperator.And:
280			self.elements(ops[0].Index)
281			return self._eval_op(ops[0], event) and self._eval_op(ops[1], event)
282			if el.FilterOperator == ua.FilterOperator.Or:
283			return self._eval_op(ops[0], event) or self._eval_el(ops[1], event)
284			if el.FilterOperator == ua.FilterOperator.Cast:
285			self.logger.warn("Cast operand not implemented, assuming True")
286			return True
287			if el.FilterOperator == ua.FilterOperator.OfType:
288			return event.EventType == self._eval_op(ops[0], event)
289			# TODO: implement missing operators
290			self.logger.warning("WhereClause not implemented for element: %s", el)
291			raise NotImplementedError
292
293			def _like_operator(self, string, pattern):
294			raise NotImplementedError
295
296			def _eval_op(self, op, event):
297			# seems spec says we should return Null if issues
298			if isinstance(op, ua.ElementOperand):
299			return self._eval_el(op.Index, event)
300			if isinstance(op, ua.AttributeOperand):
301			if op.BrowsePath:
302			return getattr(event, op.BrowsePath.Elements[0].TargetName.Name)
303			return self._aspace.get_attribute_value(event.EventType, op.AttributeId).Value.Value
304			# FIXME: check, this is probably broken
305			if isinstance(op, ua.SimpleAttributeOperand):
306			if op.BrowsePath:
307			# we only support depth of 1
308			return getattr(event, op.BrowsePath[0].Name)
309			# TODO: write code for index range.... but doe it make any sense
310			return self._aspace.get_attribute_value(event.EventType, op.AttributeId).Value.Value
311			if isinstance(op, ua.LiteralOperand):
312			return op.Value.Value
313			self.logger.warning("Where clause element % is not of a known type", op)
314			raise NotImplementedError
315

FreeOpcUa / opcua-asyncio

Pull Request — master (#45)

MonitoredItemService.datachange_callback() A

Complexity

Size

Duplication

Importance

Duplication Side-by-Side

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