2f3d897312
This patch adds a new optional service in Mistral, event engine service will listen to the message queue with exchange and topic users configed, and trigger the corresponding workflow via rpc call to mistral engine. The event engine service will receive rpc messages from mistral api Change-Id: I8bef24822575670ca90ef0479b9ce2e3e330cdeb Implements: blueprint event-notification-trigger Co-Authored-By: Lingxian Kong <anlin.kong@gmail.com>
113 lines
3.4 KiB
Python
113 lines
3.4 KiB
Python
# Copyright 2016 - IBM Corp.
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# Copyright 2016 Catalyst IT Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# 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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"""
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This module contains common structures and functions that help to handle
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AMQP messages based on olso.messaging framework.
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"""
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import abc
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import socket
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from oslo_log import log as logging
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import oslo_messaging
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from oslo_messaging.notify import dispatcher
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from oslo_messaging.notify import listener
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from oslo_messaging import target
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from oslo_messaging import transport
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import six
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LOG = logging.getLogger(__name__)
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def handle_event(self, ctxt, publisher_id, event_type, payload, metadata):
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"""Callback function of each priority of notification messages.
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The function is used to construct endpoint class dynamically when starting
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listener in event engine service.
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After the class is created, 'self' param will make sense.
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:param ctxt: the notification context dict
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:param publisher_id: always describes where notification is sent from, for
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example: 'compute.host1'
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:param event_type: describes the event, for example:
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'compute.create_instance'
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:param payload: the notification payload
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:param metadata: the notification metadata, is always a mapping containing
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a unique message_id and a timestamp.
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"""
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LOG.debug('Received notification. publisher_id: %s, event_type: %s, '
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'payload: %s, metadata: %s.', publisher_id, event_type, payload,
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metadata)
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self.event_engine.process_notification_event(
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ctxt,
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event_type,
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payload,
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metadata
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)
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return dispatcher.NotificationResult.HANDLED
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@six.add_metaclass(abc.ABCMeta)
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class NotificationEndpoint(object):
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"""Message listener endpoint.
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Only handle notifications that match the NotificationFilter rule set into
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the filter_rule attribute of the endpoint.
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"""
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event_types = []
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def __init__(self, event_engine):
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self.event_engine = event_engine
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self.filter_rule = oslo_messaging.NotificationFilter(
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event_type='|'.join(self.event_types))
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def get_pool_name(exchange):
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"""Get pool name.
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Get the pool name for the listener, it will be formatted as
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'mistral-exchange-hostname'
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:param exchange: exchange name
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"""
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pool_name = 'mistral-%s-%s' % (exchange, socket.gethostname())
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LOG.debug("Listener pool name is %s", pool_name)
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return pool_name
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def start_listener(conf, exchange, topic, endpoints):
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"""Starts up a notification listener."""
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trans = transport.get_transport(conf)
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targets = [target.Target(exchange=exchange, topic=topic)]
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pool_name = get_pool_name(exchange)
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notification_listener = listener.get_notification_listener(
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trans,
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targets,
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endpoints,
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executor='threading',
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allow_requeue=False,
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pool=pool_name
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)
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notification_listener.start()
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return notification_listener
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