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# Licensed to the StackStorm, Inc ('StackStorm') under one or more |
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# contributor license agreements. See the NOTICE file distributed with |
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# this work for additional information regarding copyright ownership. |
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# The ASF licenses this file to You under the Apache License, Version 2.0 |
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# (the "License"); you may not use this file except in compliance with |
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# the License. You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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from kombu import Connection |
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from st2common import log as logging |
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from st2common.constants.trace import TRACE_CONTEXT, TRACE_ID |
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from st2common.constants import triggers as trigger_constants |
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from st2common.util import date as date_utils |
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from st2common.services import trace as trace_service |
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from st2common.transport import consumers, reactor |
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from st2common.transport import utils as transport_utils |
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import st2reactor.container.utils as container_utils |
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from st2reactor.rules.engine import RulesEngine |
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LOG = logging.getLogger(__name__) |
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RULESENGINE_WORK_Q = reactor.get_trigger_instances_queue( |
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name='st2.trigger_instances_dispatch.rules_engine', routing_key='#') |
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class TriggerInstanceDispatcher(consumers.StagedMessageHandler): |
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message_type = dict |
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def __init__(self, connection, queues): |
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super(TriggerInstanceDispatcher, self).__init__(connection, queues) |
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self.rules_engine = RulesEngine() |
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def pre_ack_process(self, message): |
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''' |
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TriggerInstance from message is create prior to acknowledging the message. This |
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gets us a way to not acknowledge messages. |
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''' |
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trigger = message['trigger'] |
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payload = message['payload'] |
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# Accomodate for not being able to create a TrigegrInstance if a TriggerDB |
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# is not found. |
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trigger_instance = container_utils.create_trigger_instance( |
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trigger, |
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payload or {}, |
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date_utils.get_datetime_utc_now(), |
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raise_on_no_trigger=True) |
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return self._compose_pre_ack_process_response(trigger_instance, message) |
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def process(self, pre_ack_response): |
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trigger_instance, message = self._decompose_pre_ack_process_response(pre_ack_response) |
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if not trigger_instance: |
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raise ValueError('No trigger_instance provided for processing.') |
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try: |
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# Use trace_context from the message and if not found create a new context |
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# and use the trigger_instance.id as trace_tag. |
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trace_context = message.get(TRACE_CONTEXT, None) |
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if not trace_context: |
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trace_context = { |
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TRACE_ID: 'trigger_instance-%s' % str(trigger_instance.id) |
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} |
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# add a trace or update an existing trace with trigger_instance |
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trace_service.add_or_update_given_trace_context( |
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trace_context=trace_context, |
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trigger_instances=[ |
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trace_service.get_trace_component_for_trigger_instance(trigger_instance) |
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] |
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) |
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container_utils.update_trigger_instance_status( |
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trigger_instance, trigger_constants.TRIGGER_INSTANCE_PROCESSING) |
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self.rules_engine.handle_trigger_instance(trigger_instance) |
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container_utils.update_trigger_instance_status( |
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trigger_instance, trigger_constants.TRIGGER_INSTANCE_PROCESSED) |
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except: |
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# TODO : Capture the reason for failure. |
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container_utils.update_trigger_instance_status( |
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trigger_instance, trigger_constants.TRIGGER_INSTANCE_PROCESSING_FAILED) |
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# This could be a large message but at least in case of an exception |
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# we get to see more context. |
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# Beyond this point code cannot really handle the exception anyway so |
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# eating up the exception. |
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LOG.exception('Failed to handle trigger_instance %s.', trigger_instance) |
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return |
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@staticmethod |
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def _compose_pre_ack_process_response(trigger_instance, message): |
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""" |
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Codify response of the pre_ack_process method. |
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""" |
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return {'trigger_instance': trigger_instance, 'message': message} |
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@staticmethod |
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def _decompose_pre_ack_process_response(response): |
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""" |
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Break-down response of pre_ack_process into constituents for simpler consumption. |
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""" |
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return response.get('trigger_instance', None), response.get('message', None) |
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def get_worker(): |
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with Connection(transport_utils.get_messaging_urls()) as conn: |
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return TriggerInstanceDispatcher(conn, [RULESENGINE_WORK_Q]) |
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StackStorm /
st2
