79 lines
2.7 KiB
Python
79 lines
2.7 KiB
Python
# Copyright (c) 2015 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 multiprocessing
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import zmq
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from oslo_config import cfg
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from oslo_log import log as logging
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from shaker.agent import agent
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from shaker.engine import utils
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LOG = logging.getLogger(__name__)
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HEARTBEAT_AGENT = '__heartbeat'
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class MessageQueue(object):
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def __init__(self, endpoint):
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ip, port = utils.split_address(endpoint)
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context = zmq.Context()
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self.socket = context.socket(zmq.REP)
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self.socket.bind("tcp://*:%s" % port)
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LOG.info('Listening on *:%s', port)
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heartbeat = multiprocessing.Process(
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target=agent.work,
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kwargs=dict(agent_id=HEARTBEAT_AGENT, endpoint=endpoint,
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ignore_sigint=True))
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heartbeat.daemon = True
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heartbeat.start()
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def __iter__(self):
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try:
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while True:
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# Set a timeout(ms) based on agent_loss_timeout.
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# Add some padding so agent_loss_timeout
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# has a chance to fire correctly before the socket closes
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client_timeout = (cfg.CONF.agent_loss_timeout * 1000) + 3000
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# This prevents a hung process/thread when
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# server_endpoint is not reachable
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self.socket.setsockopt(zmq.RCVTIMEO, client_timeout)
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# If this is not set to 0 the socket will not
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# close even if timeout is reached
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self.socket.setsockopt(zmq.LINGER, 0)
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# Wait for next request from client
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message = self.socket.recv_json()
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LOG.debug('Received request: %s', message)
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def reply_handler(reply_message):
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self.socket.send_json(reply_message)
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LOG.debug('Sent reply: %s', reply_message)
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try:
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yield message, reply_handler
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except GeneratorExit:
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break
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except BaseException as e:
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if isinstance(e, KeyboardInterrupt): # SIGINT is ok
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LOG.info('Process is interrupted')
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else:
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LOG.exception(e)
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raise
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