asyncua.server.monitored_item_service.WhereClauseEvaluator._eval_el() - Code Metrics - FreeOpcUa/opcua-asyncio - Measure and Improve Code Quality continuously with Scrutinizer

WhereClauseEvaluator._eval_el() F
last analyzed 2020-12-22 17:52 UTC

↳ Parent: asyncua.server.monitored_item_service

Complexity

Conditions

Size

Total Lines	37
Code Lines	35

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	15
eloc	35
nop	3
dl	0
loc	37
rs	2.9998
c	0
b	0
f	0

How to fix Complexity

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

import logging
from asyncua import ua
from typing import Dict
from .address_space import AddressSpace


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: AddressSpace):
        self.logger = logging.getLogger(f"{__name__}.{isub.data.SubscriptionId}")
        self.isub = isub
        self.aspace: AddressSpace = aspace
        self._monitored_items: Dict[int, MonitoredItemData] = {}
        self._monitored_events = {}
        self._monitored_datachange: Dict[int, int] = {}
        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: ua.CreateMonitoredItemsParameters):
        results = []
        for item in params.ItemsToCreate:
            if item.ItemToMonitor.AttributeId == ua.AttributeIds.EventNotifier:
                result = self._create_events_monitored_item(item)
            else:
                result = await self._create_data_change_monitored_item(item)
            results.append(result)
        return results

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

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

    def _modify_monitored_item(self, params: ua.MonitoredItemModifyRequest):
        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: MonitoredItemData):
        if result.StatusCode.is_good():
            self._monitored_items[result.MonitoredItemId] = mdata

    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: ua.MonitoredItemCreateRequest):
        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.read_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

    async def _create_data_change_monitored_item(self, params: ua.MonitoredItemCreateRequest):
        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
            await 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: int):
        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()

    async def datachange_callback(self, handle: int, value, error=None):
        if error:
            self.logger.info("subscription %s: datachange callback called with handle '%s' and error '%s'", self,
                             handle, error)
            await self.trigger_statuschange(error)
        else:
            # self.logger.info(f"subscription {self}: datachange callback called "
            #                 f"with handle '{handle}' and value '{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
                await 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

    async 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:
            await self._trigger_event(event, mid)
        return True

    async def _trigger_event(self, event, mid: int):
        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)
        await self.isub.enqueue_event(mid, fieldlist, mdata.queue_size)

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


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

FreeOpcUa / opcua-asyncio

WhereClauseEvaluator._eval_el() F last analyzed 2020-12-22 17:52 UTC

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WhereClauseEvaluator._eval_el() F
last analyzed 2020-12-22 17:52 UTC