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# Copyright 2015-2016 Mirantis, 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 abc
import six
import oslo_messaging
from oslo_messaging._drivers.zmq_driver import zmq_async
zmq = zmq_async.import_zmq()
@six.add_metaclass(abc.ABCMeta)
class PublisherBase(object):
"""Abstract publisher class
Each publisher from zmq-driver client should implement
this interface to serve as a messages publisher.
Publisher can send request objects from zmq_request.
"""
def __init__(self, sockets_manager, sender, receiver):
"""Construct publisher.
Accept sockets manager, sender and receiver objects.
:param sockets_manager: sockets manager object
:type sockets_manager: zmq_sockets_manager.SocketsManager
:param sender: request sender object
:type sender: zmq_senders.RequestSenderBase
:param receiver: response receiver object
:type receiver: zmq_receivers.ReceiverBase
"""
self.sockets_manager = sockets_manager
self.conf = sockets_manager.conf
self.matchmaker = sockets_manager.matchmaker
self.sender = sender
self.receiver = receiver
@abc.abstractmethod
def acquire_connection(self, request):
"""Get socket to publish request on it.
:param request: request object
:type senders: zmq_request.Request
"""
@abc.abstractmethod
def send_request(self, socket, request):
"""Publish request on a socket.
:param socket: socket object to publish request on
:type socket: zmq_socket.ZmqSocket
:param request: request object
:type senders: zmq_request.Request
"""
@abc.abstractmethod
def receive_reply(self, socket, request):
"""Wait for a reply via the socket used for sending the request.
:param socket: socket object to receive reply from
:type socket: zmq_socket.ZmqSocket
:param request: request object
:type senders: zmq_request.Request
"""
@staticmethod
def _raise_timeout(request):
raise oslo_messaging.MessagingTimeout(
"Timeout %(tout)s seconds was reached for message %(msg_id)s" %
{"tout": request.timeout, "msg_id": request.message_id})
def cleanup(self):
"""Cleanup publisher: stop receiving responses, close allocated
connections etc.
"""
self.receiver.stop()
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