/usr/share/pyshared/melange/common/messaging.py is in python-melange 1:2012.1-3.
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# Copyright 2011 OpenStack LLC.
# All Rights Reserved.
#
# Licensed 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.
import logging
import kombu.connection
from kombu.pools import connections
from melange.common import config
from melange.common import utils
LOG = logging.getLogger('melange.common.messaging')
class Queue(object):
def __init__(self, name, queue_class):
self.name = name
self.queue_class = queue_class
def __enter__(self):
self.connect()
self.queue = self.conn.SimpleQueue(self.name, no_ack=False)
return self
def __exit__(self, exc_type, exc_value, traceback):
self.close()
def connect(self):
options = queue_connection_options(self.queue_class)
LOG.info("Connecting to message queue.")
LOG.debug("Message queue connect options: %(options)s" % locals())
self.conn = connections[kombu.connection.BrokerConnection(
**options)].acquire()
def put(self, msg):
LOG.debug("Putting message '%(msg)s' on queue '%(queue)s'"
% dict(msg=msg, queue=self.name))
self.queue.put(msg)
def pop(self):
msg = self.queue.get(block=False)
LOG.debug("Popped message '%(msg)s' from queue '%(queue)s'"
% dict(msg=msg, queue=self.name))
return msg.payload
def close(self):
LOG.info("Closing connection to message queue '%(queue)s'."
% dict(queue=self.name))
self.conn.release()
def purge(self):
LOG.info("Purging message queue '%(queue)s'." % dict(queue=self.name))
self.queue.queue.purge()
def queue_connection_options(queue_class):
queue_params = config.Config.get_params_group(queue_class)
queue_params['ssl'] = utils.bool_from_string(queue_params.get('ssl',
"false"))
queue_params['port'] = int(queue_params.get('port', 5672))
return queue_params
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