2d2f6ca5d2
Python 3 deprecated the logger.warn method, please see: https://docs.python.org/3/library/logging.html#logging.warning, so we prefer to use warning to avoid DeprecationWarning. Change-Id: I55148140bb2e85039356726057ae1d552e69b663
110 lines
4.0 KiB
Python
110 lines
4.0 KiB
Python
# Copyright 2014, Red Hat, Inc.
|
|
#
|
|
# 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 threading
|
|
import time
|
|
|
|
from oslo_messaging._drivers.protocols.amqp import controller
|
|
from oslo_messaging._i18n import _LW
|
|
from oslo_messaging import exceptions
|
|
|
|
from six import moves
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
class SendTask(controller.Task):
|
|
"""A task that sends a message to a target, and optionally waits for a
|
|
reply message. The caller may block until the remote confirms receipt or
|
|
the reply message has arrived.
|
|
"""
|
|
def __init__(self, target, request, wait_for_reply, deadline):
|
|
super(SendTask, self).__init__()
|
|
self._target = target
|
|
self._request = request
|
|
self._deadline = deadline
|
|
self._wait_for_reply = wait_for_reply
|
|
self._results_queue = moves.queue.Queue()
|
|
|
|
def wait(self, timeout):
|
|
"""Wait for the send to complete, and, optionally, a reply message from
|
|
the remote. Will raise MessagingTimeout if the send does not complete
|
|
or no reply is received within timeout seconds. If the request has
|
|
failed for any other reason, a MessagingException is raised.
|
|
"""
|
|
try:
|
|
result = self._results_queue.get(timeout=timeout)
|
|
except moves.queue.Empty:
|
|
if self._wait_for_reply:
|
|
reason = "Timed out waiting for a reply."
|
|
else:
|
|
reason = "Timed out waiting for send to complete."
|
|
raise exceptions.MessagingTimeout(reason)
|
|
if result["status"] == "OK":
|
|
return result.get("response", None)
|
|
raise result["error"]
|
|
|
|
def execute(self, controller):
|
|
"""Runs on eventloop thread - sends request."""
|
|
if not self._deadline or self._deadline > time.time():
|
|
controller.request(self._target, self._request,
|
|
self._results_queue, self._wait_for_reply)
|
|
else:
|
|
LOG.warning(_LW("Send request to %s aborted: TTL expired."),
|
|
self._target)
|
|
|
|
|
|
class ListenTask(controller.Task):
|
|
"""A task that creates a subscription to the given target. Messages
|
|
arriving from the target are given to the listener.
|
|
"""
|
|
def __init__(self, target, listener, notifications=False):
|
|
"""Create a subscription to the target."""
|
|
super(ListenTask, self).__init__()
|
|
self._target = target
|
|
self._listener = listener
|
|
self._notifications = notifications
|
|
|
|
def execute(self, controller):
|
|
"""Run on the eventloop thread - subscribes to target. Inbound messages
|
|
are queued to the listener's incoming queue.
|
|
"""
|
|
if self._notifications:
|
|
controller.subscribe_notifications(self._target,
|
|
self._listener.incoming)
|
|
else:
|
|
controller.subscribe(self._target, self._listener.incoming)
|
|
|
|
|
|
class ReplyTask(controller.Task):
|
|
"""A task that sends 'response' message to 'address'.
|
|
"""
|
|
def __init__(self, address, response, log_failure):
|
|
super(ReplyTask, self).__init__()
|
|
self._address = address
|
|
self._response = response
|
|
self._log_failure = log_failure
|
|
self._wakeup = threading.Event()
|
|
|
|
def wait(self):
|
|
"""Wait for the controller to send the message.
|
|
"""
|
|
self._wakeup.wait()
|
|
|
|
def execute(self, controller):
|
|
"""Run on the eventloop thread - send the response message."""
|
|
controller.response(self._address, self._response)
|
|
self._wakeup.set()
|