152 lines
4.9 KiB
Python
152 lines
4.9 KiB
Python
# Copyright (c) 2013 Mirantis Inc.
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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
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# 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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import random
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import ssl as ssl_module
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import anyjson
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import eventlet
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import kombu
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from oslo_service import sslutils
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from muranoagent.common.messaging import subscription
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class MqClient(object):
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def __init__(self, login, password, host, port, virtual_host,
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ssl=False, ssl_version=None, ca_certs=None, insecure=False):
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ssl_params = None
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if ssl:
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cert_reqs = ssl_module.CERT_REQUIRED
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if insecure:
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if ca_certs:
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cert_reqs = ssl_module.CERT_OPTIONAL
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else:
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cert_reqs = ssl_module.CERT_NONE
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ssl_params = {
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'ca_certs': ca_certs,
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'cert_reqs': cert_reqs
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}
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if ssl_version:
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key = ssl_version.lower()
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try:
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ssl_params['ssl_version'] = sslutils._SSL_PROTOCOLS[key]
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except KeyError:
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raise RuntimeError("Invalid SSL version: %s" % ssl_version)
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# Time interval after which RabbitMQ will disconnect client if no
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# heartbeats were received. Usually client sends 2 heartbeats during
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# this interval. Using random to make it less lucky that many agents
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# ping RabbitMQ simultaneously
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heartbeat_rate = 20 + 20 * random.random()
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self._connection = kombu.Connection(
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'amqp://{0}:{1}@{2}:{3}/{4}'.format(
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login,
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password,
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host,
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port,
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virtual_host
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), ssl=ssl_params, heartbeat=heartbeat_rate
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)
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self._channel = None
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self._connected = False
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self._exception = None
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def __enter__(self):
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self.connect()
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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if exc_type:
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self._connected = False
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else:
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self.close()
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return False
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def connect(self):
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self._connection.connect()
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self._channel = self._connection.channel()
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if not self._connected:
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self._connected = True
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eventlet.spawn(self._heartbeater)
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def close(self):
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if self._connected:
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self._connection.close()
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self._connected = False
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def _check_exception(self):
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ex = self._exception
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if ex:
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self._exception = None
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raise ex
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def _heartbeater(self):
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while self._connected:
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eventlet.sleep(1)
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try:
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self._connection.heartbeat_check()
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except Exception as ex:
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self._exception = ex
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self._connected = False
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def declare(self, queue, exchange='', enable_ha=False, ttl=0):
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self._check_exception()
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if not self._connected:
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raise RuntimeError('Not connected to RabbitMQ')
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queue_arguments = {}
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if enable_ha is True:
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# To use mirrored queues feature in RabbitMQ 2.x
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# we need to declare this policy on the queue itself.
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#
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# Warning: this option has no effect on RabbitMQ 3.X,
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# to enable mirrored queues feature in RabbitMQ 3.X, please
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# configure RabbitMQ.
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queue_arguments['x-ha-policy'] = 'all'
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if ttl > 0:
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queue_arguments['x-expires'] = ttl
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exchange = kombu.Exchange(exchange, type='direct', durable=True)
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queue = kombu.Queue(queue, exchange, queue, durable=False,
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queue_arguments=queue_arguments)
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bound_queue = queue(self._connection)
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bound_queue.declare()
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def send(self, message, key, exchange=''):
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self._check_exception()
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if not self._connected:
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raise RuntimeError('Not connected to RabbitMQ')
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producer = kombu.Producer(self._connection)
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producer.publish(
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exchange=str(exchange),
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routing_key=str(key),
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body=anyjson.dumps(message.body),
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message_id=str(message.id)
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)
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def open(self, queue, prefetch_count=1):
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self._check_exception()
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if not self._connected:
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raise RuntimeError('Not connected to RabbitMQ')
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return subscription.Subscription(self._connection, queue,
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prefetch_count, self._check_exception)
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