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# 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.
# pylint: disable=assignment-from-none
# XXX: This file has a lot of duplication with TriggerWatcher.
# XXX: Refactor.
from __future__ import absolute_import
import eventlet
from kombu.mixins import ConsumerMixin
from kombu import Connection
from st2common import log as logging
from st2common.transport import reactor, publishers
from st2common.transport import utils as transport_utils
import st2common.util.queues as queue_utils
LOG = logging.getLogger(__name__)
class SensorWatcher(ConsumerMixin):
def __init__(self, create_handler, update_handler, delete_handler,
queue_suffix=None):
"""
:param create_handler: Function which is called on SensorDB create event.
:type create_handler: ``callable``
:param update_handler: Function which is called on SensorDB update event.
:type update_handler: ``callable``
:param delete_handler: Function which is called on SensorDB delete event.
:type delete_handler: ``callable``
"""
# TODO: Handle sensor type filtering using routing key
self._create_handler = create_handler
self._update_handler = update_handler
self._delete_handler = delete_handler
self._sensor_watcher_q = self._get_queue(queue_suffix)
self.connection = None
self._updates_thread = None
self._handlers = {
publishers.CREATE_RK: create_handler,
publishers.UPDATE_RK: update_handler,
publishers.DELETE_RK: delete_handler
}
def get_consumers(self, Consumer, channel):
consumers = [Consumer(queues=[self._sensor_watcher_q],
accept=['pickle'],
callbacks=[self.process_task])]
return consumers
def process_task(self, body, message):
LOG.debug('process_task')
LOG.debug(' body: %s', body)
LOG.debug(' message.properties: %s', message.properties)
LOG.debug(' message.delivery_info: %s', message.delivery_info)
routing_key = message.delivery_info.get('routing_key', '')
handler = self._handlers.get(routing_key, None)
try:
if not handler:
LOG.info('Skipping message %s as no handler was found.', message)
return
try:
handler(body)
except Exception as e:
LOG.exception('Handling failed. Message body: %s. Exception: %s',
body, str(e))
finally:
message.ack()
def start(self):
try:
self.connection = Connection(transport_utils.get_messaging_urls())
self._updates_thread = eventlet.spawn(self.run)
except:
LOG.exception('Failed to start sensor_watcher.')
self.connection.release()
def stop(self):
LOG.debug('Shutting down sensor watcher.')
try:
if self._updates_thread:
self._updates_thread = eventlet.kill(self._updates_thread)
if self.connection:
channel = self.connection.channel()
bound_sensor_watch_q = self._sensor_watcher_q(channel)
try:
bound_sensor_watch_q.delete()
except:
LOG.error('Unable to delete sensor watcher queue: %s', self._sensor_watcher_q)
finally:
if self.connection:
self.connection.release()
@staticmethod
def _get_queue(queue_suffix):
queue_name = queue_utils.get_queue_name(queue_name_base='st2.sensor.watch',
queue_name_suffix=queue_suffix,
add_random_uuid_to_suffix=True
)
return reactor.get_sensor_cud_queue(queue_name, routing_key='#')