f37800943e
If you don't close the AMQP connection, then the connection remains open and the next time when the messages are sent on the listening topic, then some of the messages will not be processed as there is no dispatcher running to process the message. Closes-Bug: #1335086 Change-Id: I1f39eedf1500b6b6209ae0222f32e08e304895e0
109 lines
3.2 KiB
Python
109 lines
3.2 KiB
Python
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# Copyright 2013 Red Hat, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import abc
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import six
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from oslo.messaging import exceptions
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class TransportDriverError(exceptions.MessagingException):
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"""Base class for transport driver specific exceptions."""
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@six.add_metaclass(abc.ABCMeta)
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class IncomingMessage(object):
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def __init__(self, listener, ctxt, message):
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self.conf = listener.conf
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self.listener = listener
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self.ctxt = ctxt
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self.message = message
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@abc.abstractmethod
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def reply(self, reply=None, failure=None, log_failure=True):
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"Send a reply or failure back to the client."
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def acknowledge(self):
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"Acknowledge the message."
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@abc.abstractmethod
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def requeue(self):
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"Requeue the message."
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@six.add_metaclass(abc.ABCMeta)
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class Listener(object):
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def __init__(self, driver):
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self.conf = driver.conf
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self.driver = driver
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@abc.abstractmethod
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def poll(self, timeout=None):
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"""Blocking until a message is pending and return IncomingMessage.
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Return None after timeout seconds if timeout is set and no message is
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ending.
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"""
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def cleanup(self):
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"""Cleanup listener.
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Close connection used by listener if any. For some listeners like
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zmq there is no connection so no need to close connection.
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As this is listener specific method, overwrite it in to derived class
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if cleanup of listener required.
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"""
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pass
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@six.add_metaclass(abc.ABCMeta)
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class BaseDriver(object):
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def __init__(self, conf, url,
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default_exchange=None, allowed_remote_exmods=None):
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self.conf = conf
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self._url = url
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self._default_exchange = default_exchange
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self._allowed_remote_exmods = allowed_remote_exmods or []
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def require_features(self, requeue=False):
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if requeue:
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raise NotImplementedError('Message requeueing not supported by '
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'this transport driver')
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@abc.abstractmethod
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def send(self, target, ctxt, message,
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wait_for_reply=None, timeout=None, envelope=False):
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"""Send a message to the given target."""
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@abc.abstractmethod
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def send_notification(self, target, ctxt, message, version):
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"""Send a notification message to the given target."""
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@abc.abstractmethod
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def listen(self, target):
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"""Construct a Listener for the given target."""
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@abc.abstractmethod
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def listen_for_notifications(self, targets_and_priorities):
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"""Construct a notification Listener for the given list of
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tuple of (target, priority).
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"""
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@abc.abstractmethod
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def cleanup(self):
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"""Release all resources."""
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