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

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Push — master ( 3fb232...b005e0 )

by Olivier

created 2019-05-04 07:55 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
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 = 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

    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: 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
            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: 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.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: 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
            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()

    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)
            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: 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)
        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: 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_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			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 = 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			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			variant = self.aspace.get_attribute_value(nodeid, attr)
78			self.datachange_callback(handle, variant)
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			self._monitored_item_counter += 1
98
99			def _make_monitored_item_common(self, params):
100			result = ua.MonitoredItemCreateResult()
101			result.RevisedSamplingInterval = self.isub.data.RevisedPublishingInterval
102			result.RevisedQueueSize = params.RequestedParameters.QueueSize
103			self._monitored_item_counter += 1
104			result.MonitoredItemId = self._monitored_item_counter
105			self.logger.debug("Creating MonitoredItem with id %s", result.MonitoredItemId)
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			return result, mdata
113
114			def _create_events_monitored_item(self, params: ua.MonitoredItemCreateRequest):
115			self.logger.info("request to subscribe to events for node %s and attribute %s", params.ItemToMonitor.NodeId,
116			params.ItemToMonitor.AttributeId)
117
118			result, mdata = self._make_monitored_item_common(params)
119			ev_notify_byte = self.aspace.get_attribute_value(params.ItemToMonitor.NodeId,
120			ua.AttributeIds.EventNotifier).Value.Value
121
122			if ev_notify_byte is None or not ua.ua_binary.test_bit(ev_notify_byte, ua.EventNotifier.SubscribeToEvents):
123			result.StatusCode = ua.StatusCode(ua.StatusCodes.BadServiceUnsupported)
124			return result
125			# result.FilterResult = ua.EventFilterResult() # spec says we can ignore if not error
126			mdata.where_clause_evaluator = WhereClauseEvaluator(self.logger, self.aspace, mdata.filter.WhereClause)
127			self._commit_monitored_item(result, mdata)
128			if params.ItemToMonitor.NodeId not in self._monitored_events:
129			self._monitored_events[params.ItemToMonitor.NodeId] = []
130			self._monitored_events[params.ItemToMonitor.NodeId].append(result.MonitoredItemId)
131			return result
132
133			def _create_data_change_monitored_item(self, params: ua.MonitoredItemCreateRequest):
134			self.logger.info("request to subscribe to datachange for node %s and attribute %s", params.ItemToMonitor.NodeId,
135			params.ItemToMonitor.AttributeId)
136
137			result, mdata = self._make_monitored_item_common(params)
138			result.FilterResult = params.RequestedParameters.Filter
139			result.StatusCode, handle = self.aspace.add_datachange_callback(
140			params.ItemToMonitor.NodeId, params.ItemToMonitor.AttributeId, self.datachange_callback)
141
142			self.logger.debug("adding callback return status %s and handle %s", result.StatusCode, handle)
143			mdata.callback_handle = handle
144			self._commit_monitored_item(result, mdata)
145			if result.StatusCode.is_good():
146			self._monitored_datachange[handle] = result.MonitoredItemId
147			# force data change event generation
148			self.trigger_datachange(handle, params.ItemToMonitor.NodeId, params.ItemToMonitor.AttributeId)
149			return result
150
151			def delete_monitored_items(self, ids):
152			self.logger.debug("delete monitored items %s", ids)
153			# with self._lock:
154			results = []
155			for mid in ids:
156			results.append(self._delete_monitored_items(mid))
157			return results
158
159			def _delete_monitored_items(self, mid: int):
160			if mid not in self._monitored_items:
161			return ua.StatusCode(ua.StatusCodes.BadMonitoredItemIdInvalid)
162			for k, v in self._monitored_events.items():
163			if mid in v:
164			v.remove(mid)
165			if not v:
166			self._monitored_events.pop(k)
167			break
168			for k, v in self._monitored_datachange.items():
169			if v == mid:
170			self.aspace.delete_datachange_callback(k)
171			self._monitored_datachange.pop(k)
172			break
173			self._monitored_items.pop(mid)
174			return ua.StatusCode()
175
176			def datachange_callback(self, handle: int, value, error=None):
177			if error:
178			self.logger.info("subscription %s: datachange callback called with handle '%s' and error '%s'", self,
179			handle, error)
180			self.trigger_statuschange(error)
181			else:
182			self.logger.info("subscription %s: datachange callback called with handle '%s' and value '%s'", self,
183			handle, value.Value)
184			event = ua.MonitoredItemNotification()
185			mid = self._monitored_datachange[handle]
186			mdata = self._monitored_items[mid]
187			mdata.mvalue.set_current_value(value.Value.Value)
188			if mdata.filter:
189			deadband_flag_pass = self.deadband_callback(mdata.mvalue, mdata.filter)
190			else:
191			deadband_flag_pass = True
192			if deadband_flag_pass:
193			event.ClientHandle = mdata.client_handle
194			event.Value = value
195			self.isub.enqueue_datachange_event(mid, event, mdata.queue_size)
196
197			def deadband_callback(self, values, flt):
198			if flt.DeadbandType == ua.DeadbandType.None_ or values.get_old_value() is None:
199			return True
200			if flt.DeadbandType == ua.DeadbandType.Absolute and \
201			((abs(values.get_current_value() - values.get_old_value())) > flt.DeadbandValue):
202			return True
203			if flt.DeadbandType == ua.DeadbandType.Percent:
204			self.logger.warning("DeadbandType Percent is not implemented !")
205			return True
206			return False
207
208			def trigger_event(self, event):
209			if event.emitting_node not in self._monitored_events:
210			self.logger.debug("%s has no subscription for events %s from node: %s", self, event, event.emitting_node)
211			return False
212			self.logger.debug("%s has subscription for events %s from node: %s", self, event, event.emitting_node)
213			mids = self._monitored_events[event.emitting_node]
214			for mid in mids:
215			self._trigger_event(event, mid)
216			return True
217
218			def _trigger_event(self, event, mid: int):
219			if mid not in self._monitored_items:
220			self.logger.debug("Could not find monitored items for id %s for event %s in subscription %s", mid, event,
221			self)
222			return
223			mdata = self._monitored_items[mid]
224			if not mdata.where_clause_evaluator.eval(event):
225			self.logger.info("%s, %s, Event %s does not fit WhereClause, not generating event", self, mid, event)
226			return
227			fieldlist = ua.EventFieldList()
228			fieldlist.ClientHandle = mdata.client_handle
229			fieldlist.EventFields = event.to_event_fields(mdata.filter.SelectClauses)
230			self.isub.enqueue_event(mid, fieldlist, mdata.queue_size)
231
232			def trigger_statuschange(self, code):
233			self.isub.enqueue_statuschange(code)
234
235
236			class WhereClauseEvaluator:
237			def __init__(self, logger, aspace: AddressSpace, whereclause):
238			self.logger = logger
239			self.elements = whereclause.Elements
240			self._aspace = aspace
241
242			def eval(self, event):
243			if not self.elements:
244			return True
245			# spec says we should only evaluate first element, which may use other elements
246			try:
247			res = self._eval_el(0, event)
248			except Exception as ex:
249			self.logger.exception("Exception while evaluating WhereClause %s for event %s: %s", self.elements, event,
250			ex)
251			return False
252			return res
253
254			def _eval_el(self, index, event):
255			el = self.elements[index]
256			# ops = [self._eval_op(op, event) for op in el.FilterOperands]
257			ops = el.FilterOperands # just to make code more readable
258			if el.FilterOperator == ua.FilterOperator.Equals:
259			return self._eval_op(ops[0], event) == self._eval_el(ops[1], event)
260			if el.FilterOperator == ua.FilterOperator.IsNull:
261			return self._eval_op(ops[0], event) is None # FIXME: might be too strict
262			if el.FilterOperator == ua.FilterOperator.GreaterThan:
263			return self._eval_op(ops[0], event) > self._eval_el(ops[1], event)
264			if el.FilterOperator == ua.FilterOperator.LessThan:
265			return self._eval_op(ops[0], event) < self._eval_el(ops[1], event)
266			if el.FilterOperator == ua.FilterOperator.GreaterThanOrEqual:
267			return self._eval_op(ops[0], event) >= self._eval_el(ops[1], event)
268			if el.FilterOperator == ua.FilterOperator.LessThanOrEqual:
269			return self._eval_op(ops[0], event) <= self._eval_el(ops[1], event)
270			if el.FilterOperator == ua.FilterOperator.Like:
271			return self._like_operator(self._eval_op(ops[0], event), self._eval_el(ops[1], event))
272			if el.FilterOperator == ua.FilterOperator.Not:
273			return not self._eval_op(ops[0], event)
274			if el.FilterOperator == ua.FilterOperator.Between:
275			return self._eval_el(ops[2], event) >= self._eval_op(ops[0], event) >= self._eval_el(ops[1], event)
276			if el.FilterOperator == ua.FilterOperator.InList:
277			return self._eval_op(ops[0], event) in [self._eval_op(op, event) for op in ops[1:]]
278			if el.FilterOperator == ua.FilterOperator.And:
279			self.elements(ops[0].Index)
280			return self._eval_op(ops[0], event) and self._eval_op(ops[1], event)
281			if el.FilterOperator == ua.FilterOperator.Or:
282			return self._eval_op(ops[0], event) or self._eval_el(ops[1], event)
283			if el.FilterOperator == ua.FilterOperator.Cast:
284			self.logger.warn("Cast operand not implemented, assuming True")
285			return True
286			if el.FilterOperator == ua.FilterOperator.OfType:
287			return event.EventType == self._eval_op(ops[0], event)
288			# TODO: implement missing operators
289			self.logger.warning("WhereClause not implemented for element: %s", el)
290			raise NotImplementedError
291
292			def _like_operator(self, string, pattern):
293			raise NotImplementedError
294
295			def _eval_op(self, op, event):
296			# seems spec says we should return Null if issues
297			if isinstance(op, ua.ElementOperand):
298			return self._eval_el(op.Index, event)
299			if isinstance(op, ua.AttributeOperand):
300			if op.BrowsePath:
301			return getattr(event, op.BrowsePath.Elements[0].TargetName.Name)
302			return self._aspace.get_attribute_value(event.EventType, op.AttributeId).Value.Value
303			# FIXME: check, this is probably broken
304			if isinstance(op, ua.SimpleAttributeOperand):
305			if op.BrowsePath:
306			# we only support depth of 1
307			return getattr(event, op.BrowsePath[0].Name)
308			# TODO: write code for index range.... but doe it make any sense
309			return self._aspace.get_attribute_value(event.EventType, op.AttributeId).Value.Value
310			if isinstance(op, ua.LiteralOperand):
311			return op.Value.Value
312			self.logger.warning("Where clause element % is not of a known type", op)
313			raise NotImplementedError
314

FreeOpcUa / opcua-asyncio

Push — master ( 3fb232...b005e0 )

MonitoredItemService.datachange_callback() A

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Duplication

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