Notifier.process() - Code Metrics - Inspection of "Merge pull request #3496 from StackStorm/issue_348..." - StackStorm/st2 - Measure and Improve Code Quality continuously with Scrutinizer

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created 2017-06-27 10:00 UTC

Notifier.process() A

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Complexity

Conditions

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes	2
Bugs	0	Features	0

Metric	Value
cc	3
c	2
b	0
f	0
dl	0
loc	18
rs	9.4285

# Licensed to the StackStorm, Inc ('StackStorm') under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from datetime import datetime
import json

from kombu import Connection
from oslo_config import cfg

from st2common import log as logging
from st2common.constants.action import LIVEACTION_STATUS_SUCCEEDED
from st2common.constants.action import LIVEACTION_FAILED_STATES
from st2common.constants.action import LIVEACTION_COMPLETED_STATES
from st2common.constants.triggers import INTERNAL_TRIGGER_TYPES
from st2common.models.api.trace import TraceContext
from st2common.models.db.execution import ActionExecutionDB
from st2common.persistence.action import Action
from st2common.persistence.liveaction import LiveAction
from st2common.persistence.policy import Policy
from st2common import policies
from st2common.models.system.common import ResourceReference
from st2common.persistence.execution import ActionExecution
from st2common.services import trace as trace_service
from st2common.transport import consumers, execution, publishers
from st2common.transport import utils as transport_utils
from st2common.transport.reactor import TriggerDispatcher
from st2common.util import isotime
from st2common.util import jinja as jinja_utils
from st2common.constants.action import ACTION_CONTEXT_KV_PREFIX
from st2common.constants.action import ACTION_PARAMETERS_KV_PREFIX
from st2common.constants.action import ACTION_RESULTS_KV_PREFIX
from st2common.constants.keyvalue import FULL_SYSTEM_SCOPE, SYSTEM_SCOPE, DATASTORE_PARENT_SCOPE
from st2common.services.keyvalues import KeyValueLookup

__all__ = [
    'Notifier',
    'get_notifier'
]

LOG = logging.getLogger(__name__)

ACTIONUPDATE_WORK_Q = execution.get_queue('st2.notifiers.execution.work',
                                          routing_key=publishers.UPDATE_RK)

ACTION_SENSOR_ENABLED = cfg.CONF.action_sensor.enable
# XXX: Fix this nasty positional dependency.
ACTION_TRIGGER_TYPE = INTERNAL_TRIGGER_TYPES['action'][0]
NOTIFY_TRIGGER_TYPE = INTERNAL_TRIGGER_TYPES['action'][1]


class Notifier(consumers.MessageHandler):
    message_type = ActionExecutionDB

    def __init__(self, connection, queues, trigger_dispatcher=None):
        super(Notifier, self).__init__(connection, queues)
        if not trigger_dispatcher:
            trigger_dispatcher = TriggerDispatcher(LOG)
        self._trigger_dispatcher = trigger_dispatcher
        self._notify_trigger = ResourceReference.to_string_reference(
            pack=NOTIFY_TRIGGER_TYPE['pack'],
            name=NOTIFY_TRIGGER_TYPE['name'])
        self._action_trigger = ResourceReference.to_string_reference(
            pack=ACTION_TRIGGER_TYPE['pack'],
            name=ACTION_TRIGGER_TYPE['name'])

    def process(self, execution_db):
        execution_id = str(execution_db.id)
        extra = {'execution': execution_db}
        LOG.debug('Processing execution %s', execution_id, extra=extra)

        if execution_db.status not in LIVEACTION_COMPLETED_STATES:
            LOG.debug('Skipping processing of execution %s since it\'s not in a completed state' %
                      (execution_id), extra=extra)
            return

        liveaction_id = execution_db.liveaction['id']
        liveaction_db = LiveAction.get_by_id(liveaction_id)
        self._apply_post_run_policies(liveaction_db=liveaction_db)

        if liveaction_db.notify is not None:
            self._post_notify_triggers(liveaction_db=liveaction_db, execution_db=execution_db)

        self._post_generic_trigger(liveaction_db=liveaction_db, execution_db=execution_db)

    def _get_execution_for_liveaction(self, liveaction):
        execution = ActionExecution.get(liveaction__id=str(liveaction.id))
param = 5

class Foo:
    def __init__(self, param):   # "param" would be flagged here
        self.param = param

        if not execution:
            return None

        return execution

    def _post_notify_triggers(self, liveaction_db=None, execution_db=None):
        notify = getattr(liveaction_db, 'notify', None)

        if not notify:
            return

        if notify.on_complete:
            self._post_notify_subsection_triggers(
                liveaction_db=liveaction_db, execution_db=execution_db,
                notify_subsection=notify.on_complete,
                default_message_suffix='completed.')
        if liveaction_db.status == LIVEACTION_STATUS_SUCCEEDED and notify.on_success:
            self._post_notify_subsection_triggers(
                liveaction_db=liveaction_db, execution_db=execution_db,
                notify_subsection=notify.on_success,
                default_message_suffix='succeeded.')
        if liveaction_db.status in LIVEACTION_FAILED_STATES and notify.on_failure:
            self._post_notify_subsection_triggers(
                liveaction_db=liveaction_db, execution_db=execution_db,
                notify_subsection=notify.on_failure,
                default_message_suffix='failed.')

    def _post_notify_subsection_triggers(self, liveaction_db=None, execution_db=None,
                                         notify_subsection=None,
                                         default_message_suffix=None):
        routes = (getattr(notify_subsection, 'routes') or
                  getattr(notify_subsection, 'channels', None))

        execution_id = str(execution_db.id)

        if routes and len(routes) >= 1:
            payload = {}
            message = notify_subsection.message or (
                'Action ' + liveaction_db.action + ' ' + default_message_suffix)
            data = notify_subsection.data or {}

            jinja_context = self._build_jinja_context(
                liveaction_db=liveaction_db, execution_db=execution_db
            )

            try:
                message = self._transform_message(message=message,
                                                  context=jinja_context)
            except:
                LOG.exception('Failed (Jinja) transforming `message`.')

            try:
                data = self._transform_data(data=data, context=jinja_context)
            except:
                LOG.exception('Failed (Jinja) transforming `data`.')

            # At this point convert result to a string. This restricts the rulesengines
            # ability to introspect the result. On the other handle atleast a json usable
            # result is sent as part of the notification. If jinja is required to convert
            # to a string representation it uses str(...) which make it impossible to
            # parse the result as json any longer.
            # TODO: Use to_serializable_dict
            data['result'] = json.dumps(liveaction_db.result)

            payload['message'] = message
            payload['data'] = data
            payload['execution_id'] = execution_id
            payload['status'] = liveaction_db.status
            payload['start_timestamp'] = isotime.format(liveaction_db.start_timestamp)

            try:
                payload['end_timestamp'] = isotime.format(liveaction_db.end_timestamp)
            except AttributeError:
                # This can be raised if liveaction.end_timestamp is None, which is caused
                # when policy cancels a request due to concurrency
                # In this case, use datetime.now() instead
                payload['end_timestamp'] = isotime.format(datetime.utcnow())

            payload['action_ref'] = liveaction_db.action
            payload['runner_ref'] = self._get_runner_ref(liveaction_db.action)

            trace_context = self._get_trace_context(execution_id=execution_id)

            failed_routes = []
            for route in routes:
                try:
                    payload['route'] = route
                    # Deprecated. Only for backward compatibility reasons.
                    payload['channel'] = route
                    LOG.debug('POSTing %s for %s. Payload - %s.', NOTIFY_TRIGGER_TYPE['name'],
                              liveaction_db.id, payload)
                    self._trigger_dispatcher.dispatch(self._notify_trigger, payload=payload,
                                                      trace_context=trace_context)
                except:
                    failed_routes.append(route)

            if len(failed_routes) > 0:
                raise Exception('Failed notifications to routes: %s' % ', '.join(failed_routes))

    def _build_jinja_context(self, liveaction_db, execution_db):
        context = {}
        context.update({
            DATASTORE_PARENT_SCOPE: {
                SYSTEM_SCOPE: KeyValueLookup(scope=FULL_SYSTEM_SCOPE)
            }
        })
        context.update({ACTION_PARAMETERS_KV_PREFIX: liveaction_db.parameters})
        context.update({ACTION_CONTEXT_KV_PREFIX: liveaction_db.context})
        context.update({ACTION_RESULTS_KV_PREFIX: execution_db.result})
        return context

    def _transform_message(self, message, context=None):
        mapping = {'message': message}
        context = context or {}
        return (jinja_utils.render_values(mapping=mapping, context=context)).get('message',
                                                                                 message)

    def _transform_data(self, data, context=None):
        return jinja_utils.render_values(mapping=data, context=context)

    def _get_trace_context(self, execution_id):
        trace_db = trace_service.get_trace_db_by_action_execution(
            action_execution_id=execution_id)
        if trace_db:
            return TraceContext(id_=str(trace_db.id), trace_tag=trace_db.trace_tag)
        # If no trace_context is found then do not create a new one here. If necessary
        # it shall be created downstream. Sure this is impl leakage of some sort.
        return None

    def _post_generic_trigger(self, liveaction_db=None, execution_db=None):
        if not ACTION_SENSOR_ENABLED:
            LOG.debug('Action trigger is disabled, skipping trigger dispatch...')
            return

        execution_id = str(execution_db.id)
        payload = {'execution_id': execution_id,
                   'status': liveaction_db.status,
                   'start_timestamp': str(liveaction_db.start_timestamp),
                   # deprecate 'action_name' at some point and switch to 'action_ref'
                   'action_name': liveaction_db.action,
                   'action_ref': liveaction_db.action,
                   'runner_ref': self._get_runner_ref(liveaction_db.action),
                   'parameters': liveaction_db.get_masked_parameters(),
                   'result': liveaction_db.result}
        # Use execution_id to extract trace rather than liveaction. execution_id
        # will look-up an exact TraceDB while liveaction depending on context
        # may not end up going to the DB.
        trace_context = self._get_trace_context(execution_id=execution_id)
        LOG.debug('POSTing %s for %s. Payload - %s. TraceContext - %s',
                  ACTION_TRIGGER_TYPE['name'], liveaction_db.id, payload, trace_context)
        self._trigger_dispatcher.dispatch(self._action_trigger, payload=payload,
                                          trace_context=trace_context)

    def _apply_post_run_policies(self, liveaction_db):
        # Apply policies defined for the action.
        policy_dbs = Policy.query(resource_ref=liveaction_db.action, enabled=True)
        LOG.debug('Applying %s post_run policies' % (len(policy_dbs)))

        for policy_db in policy_dbs:
            driver = policies.get_driver(policy_db.ref,
                                         policy_db.policy_type,
                                         **policy_db.parameters)

            try:
                LOG.debug('Applying post_run policy "%s" (%s) for liveaction %s' %
                          (policy_db.ref, policy_db.policy_type, str(liveaction_db.id)))
                liveaction_db = driver.apply_after(liveaction_db)
            except:
                LOG.exception('An exception occurred while applying policy "%s".', policy_db.ref)

        return liveaction_db

    def _get_runner_ref(self, action_ref):
        """
        Retrieve a runner reference for the provided action.

        :rtype: ``str``
        """
        action = Action.get_by_ref(action_ref)
        return action['runner_type']['name']


def get_notifier():
    with Connection(transport_utils.get_messaging_urls()) as conn:
        return Notifier(conn, [ACTIONUPDATE_WORK_Q], trigger_dispatcher=TriggerDispatcher(LOG))


1			# Licensed to the StackStorm, Inc ('StackStorm') under one or more
2			# contributor license agreements. See the NOTICE file distributed with
3			# this work for additional information regarding copyright ownership.
4			# The ASF licenses this file to You under the Apache License, Version 2.0
5			# (the "License"); you may not use this file except in compliance with
6			# the License. You may obtain a copy of the License at
7			#
8			# http://www.apache.org/licenses/LICENSE-2.0
9			#
10			# Unless required by applicable law or agreed to in writing, software
11			# distributed under the License is distributed on an "AS IS" BASIS,
12			# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13			# See the License for the specific language governing permissions and
14			# limitations under the License.
15
16			from datetime import datetime
17			import json
18
19			from kombu import Connection
20			from oslo_config import cfg
21
22			from st2common import log as logging
23			from st2common.constants.action import LIVEACTION_STATUS_SUCCEEDED
24			from st2common.constants.action import LIVEACTION_FAILED_STATES
25			from st2common.constants.action import LIVEACTION_COMPLETED_STATES
26			from st2common.constants.triggers import INTERNAL_TRIGGER_TYPES
27			from st2common.models.api.trace import TraceContext
28			from st2common.models.db.execution import ActionExecutionDB
29			from st2common.persistence.action import Action
30			from st2common.persistence.liveaction import LiveAction
31			from st2common.persistence.policy import Policy
32			from st2common import policies
33			from st2common.models.system.common import ResourceReference
34			from st2common.persistence.execution import ActionExecution
35			from st2common.services import trace as trace_service
36			from st2common.transport import consumers, execution, publishers
37			from st2common.transport import utils as transport_utils
38			from st2common.transport.reactor import TriggerDispatcher
39			from st2common.util import isotime
40			from st2common.util import jinja as jinja_utils
41			from st2common.constants.action import ACTION_CONTEXT_KV_PREFIX
42			from st2common.constants.action import ACTION_PARAMETERS_KV_PREFIX
43			from st2common.constants.action import ACTION_RESULTS_KV_PREFIX
44			from st2common.constants.keyvalue import FULL_SYSTEM_SCOPE, SYSTEM_SCOPE, DATASTORE_PARENT_SCOPE
45			from st2common.services.keyvalues import KeyValueLookup
46
47			__all__ = [
48			'Notifier',
49			'get_notifier'
50			]
51
52			LOG = logging.getLogger(__name__)
53
54			ACTIONUPDATE_WORK_Q = execution.get_queue('st2.notifiers.execution.work',
55			routing_key=publishers.UPDATE_RK)
56
57			ACTION_SENSOR_ENABLED = cfg.CONF.action_sensor.enable
58			# XXX: Fix this nasty positional dependency.
59			ACTION_TRIGGER_TYPE = INTERNAL_TRIGGER_TYPES['action'][0]
60			NOTIFY_TRIGGER_TYPE = INTERNAL_TRIGGER_TYPES['action'][1]
61
62
63			class Notifier(consumers.MessageHandler):
64			message_type = ActionExecutionDB
65
66			def __init__(self, connection, queues, trigger_dispatcher=None):
67			super(Notifier, self).__init__(connection, queues)
68			if not trigger_dispatcher:
69			trigger_dispatcher = TriggerDispatcher(LOG)
70			self._trigger_dispatcher = trigger_dispatcher
71			self._notify_trigger = ResourceReference.to_string_reference(
72			pack=NOTIFY_TRIGGER_TYPE['pack'],
73			name=NOTIFY_TRIGGER_TYPE['name'])
74			self._action_trigger = ResourceReference.to_string_reference(
75			pack=ACTION_TRIGGER_TYPE['pack'],
76			name=ACTION_TRIGGER_TYPE['name'])
77
78			def process(self, execution_db):
79			execution_id = str(execution_db.id)
80			extra = {'execution': execution_db}
81			LOG.debug('Processing execution %s', execution_id, extra=extra)
82
83			if execution_db.status not in LIVEACTION_COMPLETED_STATES:
84			LOG.debug('Skipping processing of execution %s since it\'s not in a completed state' %
85			(execution_id), extra=extra)
86			return
87
88			liveaction_id = execution_db.liveaction['id']
89			liveaction_db = LiveAction.get_by_id(liveaction_id)
90			self._apply_post_run_policies(liveaction_db=liveaction_db)
91
92			if liveaction_db.notify is not None:
93			self._post_notify_triggers(liveaction_db=liveaction_db, execution_db=execution_db)
94
95			self._post_generic_trigger(liveaction_db=liveaction_db, execution_db=execution_db)
96
97			def _get_execution_for_liveaction(self, liveaction):
98			execution = ActionExecution.get(liveaction__id=str(liveaction.id))
			0 ignored issues – show Comprehensibility Bug introduced 2017-06-20 03:29 UTC by Report Bug Copy Issue Report `execution` is re-defining a name which is already available in the outer-scope (previously defined on line `36`). It is generally a bad practice to shadow variables from the outer-scope. In most cases, this is done unintentionally and might lead to unexpected behavior: param = 5 class Foo: def __init__(self, param): # "param" would be flagged here self.param = param Loading history...
99
100			if not execution:
101			return None
102
103			return execution
104
105			def _post_notify_triggers(self, liveaction_db=None, execution_db=None):
106			notify = getattr(liveaction_db, 'notify', None)
107
108			if not notify:
109			return
110
111			if notify.on_complete:
112			self._post_notify_subsection_triggers(
113			liveaction_db=liveaction_db, execution_db=execution_db,
114			notify_subsection=notify.on_complete,
115			default_message_suffix='completed.')
116			if liveaction_db.status == LIVEACTION_STATUS_SUCCEEDED and notify.on_success:
117			self._post_notify_subsection_triggers(
118			liveaction_db=liveaction_db, execution_db=execution_db,
119			notify_subsection=notify.on_success,
120			default_message_suffix='succeeded.')
121			if liveaction_db.status in LIVEACTION_FAILED_STATES and notify.on_failure:
122			self._post_notify_subsection_triggers(
123			liveaction_db=liveaction_db, execution_db=execution_db,
124			notify_subsection=notify.on_failure,
125			default_message_suffix='failed.')
126
127			def _post_notify_subsection_triggers(self, liveaction_db=None, execution_db=None,
128			notify_subsection=None,
129			default_message_suffix=None):
130			routes = (getattr(notify_subsection, 'routes') or
131			getattr(notify_subsection, 'channels', None))
132
133			execution_id = str(execution_db.id)
134
135			if routes and len(routes) >= 1:
136			payload = {}
137			message = notify_subsection.message or (
138			'Action ' + liveaction_db.action + ' ' + default_message_suffix)
139			data = notify_subsection.data or {}
140
141			jinja_context = self._build_jinja_context(
142			liveaction_db=liveaction_db, execution_db=execution_db
143			)
144
145			try:
146			message = self._transform_message(message=message,
147			context=jinja_context)
148			except:
149			LOG.exception('Failed (Jinja) transforming `message`.')
150
151			try:
152			data = self._transform_data(data=data, context=jinja_context)
153			except:
154			LOG.exception('Failed (Jinja) transforming `data`.')
155
156			# At this point convert result to a string. This restricts the rulesengines
157			# ability to introspect the result. On the other handle atleast a json usable
158			# result is sent as part of the notification. If jinja is required to convert
159			# to a string representation it uses str(...) which make it impossible to
160			# parse the result as json any longer.
161			# TODO: Use to_serializable_dict
162			data['result'] = json.dumps(liveaction_db.result)
163
164			payload['message'] = message
165			payload['data'] = data
166			payload['execution_id'] = execution_id
167			payload['status'] = liveaction_db.status
168			payload['start_timestamp'] = isotime.format(liveaction_db.start_timestamp)
169
170			try:
171			payload['end_timestamp'] = isotime.format(liveaction_db.end_timestamp)
172			except AttributeError:
173			# This can be raised if liveaction.end_timestamp is None, which is caused
174			# when policy cancels a request due to concurrency
175			# In this case, use datetime.now() instead
176			payload['end_timestamp'] = isotime.format(datetime.utcnow())
177
178			payload['action_ref'] = liveaction_db.action
179			payload['runner_ref'] = self._get_runner_ref(liveaction_db.action)
180
181			trace_context = self._get_trace_context(execution_id=execution_id)
182
183			failed_routes = []
184			for route in routes:
185			try:
186			payload['route'] = route
187			# Deprecated. Only for backward compatibility reasons.
188			payload['channel'] = route
189			LOG.debug('POSTing %s for %s. Payload - %s.', NOTIFY_TRIGGER_TYPE['name'],
190			liveaction_db.id, payload)
191			self._trigger_dispatcher.dispatch(self._notify_trigger, payload=payload,
192			trace_context=trace_context)
193			except:
194			failed_routes.append(route)
195
196			if len(failed_routes) > 0:
197			raise Exception('Failed notifications to routes: %s' % ', '.join(failed_routes))
198
199			def _build_jinja_context(self, liveaction_db, execution_db):
200			context = {}
201			context.update({
202			DATASTORE_PARENT_SCOPE: {
203			SYSTEM_SCOPE: KeyValueLookup(scope=FULL_SYSTEM_SCOPE)
204			}
205			})
206			context.update({ACTION_PARAMETERS_KV_PREFIX: liveaction_db.parameters})
207			context.update({ACTION_CONTEXT_KV_PREFIX: liveaction_db.context})
208			context.update({ACTION_RESULTS_KV_PREFIX: execution_db.result})
209			return context
210
211			def _transform_message(self, message, context=None):
212			mapping = {'message': message}
213			context = context or {}
214			return (jinja_utils.render_values(mapping=mapping, context=context)).get('message',
215			message)
216
217			def _transform_data(self, data, context=None):
218			return jinja_utils.render_values(mapping=data, context=context)
219
220			def _get_trace_context(self, execution_id):
221			trace_db = trace_service.get_trace_db_by_action_execution(
222			action_execution_id=execution_id)
223			if trace_db:
224			return TraceContext(id_=str(trace_db.id), trace_tag=trace_db.trace_tag)
225			# If no trace_context is found then do not create a new one here. If necessary
226			# it shall be created downstream. Sure this is impl leakage of some sort.
227			return None
228
229			def _post_generic_trigger(self, liveaction_db=None, execution_db=None):
230			if not ACTION_SENSOR_ENABLED:
231			LOG.debug('Action trigger is disabled, skipping trigger dispatch...')
232			return
233
234			execution_id = str(execution_db.id)
235			payload = {'execution_id': execution_id,
236			'status': liveaction_db.status,
237			'start_timestamp': str(liveaction_db.start_timestamp),
238			# deprecate 'action_name' at some point and switch to 'action_ref'
239			'action_name': liveaction_db.action,
240			'action_ref': liveaction_db.action,
241			'runner_ref': self._get_runner_ref(liveaction_db.action),
242			'parameters': liveaction_db.get_masked_parameters(),
243			'result': liveaction_db.result}
244			# Use execution_id to extract trace rather than liveaction. execution_id
245			# will look-up an exact TraceDB while liveaction depending on context
246			# may not end up going to the DB.
247			trace_context = self._get_trace_context(execution_id=execution_id)
248			LOG.debug('POSTing %s for %s. Payload - %s. TraceContext - %s',
249			ACTION_TRIGGER_TYPE['name'], liveaction_db.id, payload, trace_context)
250			self._trigger_dispatcher.dispatch(self._action_trigger, payload=payload,
251			trace_context=trace_context)
252
253			def _apply_post_run_policies(self, liveaction_db):
254			# Apply policies defined for the action.
255			policy_dbs = Policy.query(resource_ref=liveaction_db.action, enabled=True)
256			LOG.debug('Applying %s post_run policies' % (len(policy_dbs)))
257
258			for policy_db in policy_dbs:
259			driver = policies.get_driver(policy_db.ref,
260			policy_db.policy_type,
261			**policy_db.parameters)
262
263			try:
264			LOG.debug('Applying post_run policy "%s" (%s) for liveaction %s' %
265			(policy_db.ref, policy_db.policy_type, str(liveaction_db.id)))
266			liveaction_db = driver.apply_after(liveaction_db)
267			except:
268			LOG.exception('An exception occurred while applying policy "%s".', policy_db.ref)
269
270			return liveaction_db
271
272			def _get_runner_ref(self, action_ref):
273			"""
274			Retrieve a runner reference for the provided action.
275
276			:rtype: ``str``
277			"""
278			action = Action.get_by_ref(action_ref)
279			return action['runner_type']['name']
280
281
282			def get_notifier():
283			with Connection(transport_utils.get_messaging_urls()) as conn:
284			return Notifier(conn, [ACTIONUPDATE_WORK_Q], trigger_dispatcher=TriggerDispatcher(LOG))
285

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Notifier.process() A

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