/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_receivers.py is in python-oslo.messaging 5.10.0-2.
This file is owned by root:root, with mode 0o644.
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#
# 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 logging
import threading
import futurist
import six
from oslo_messaging._drivers.zmq_driver.client import zmq_response
from oslo_messaging._drivers.zmq_driver import zmq_async
from oslo_messaging._drivers.zmq_driver import zmq_names
LOG = logging.getLogger(__name__)
zmq = zmq_async.import_zmq()
@six.add_metaclass(abc.ABCMeta)
class ReceiverBase(object):
"""Base response receiving interface."""
def __init__(self, conf):
self.conf = conf
self._lock = threading.Lock()
self._requests = {}
self._poller = zmq_async.get_poller()
self._executor = zmq_async.get_executor(method=self._run_loop)
self._executor.execute()
@abc.abstractproperty
def message_types(self):
"""A set of supported incoming response types."""
def register_socket(self, socket):
"""Register a socket for receiving data."""
self._poller.register(socket, recv_method=self.recv_response)
def unregister_socket(self, socket):
"""Unregister a socket from receiving data."""
self._poller.unregister(socket)
@abc.abstractmethod
def recv_response(self, socket):
"""Receive a response and return a tuple of the form
(reply_id, message_type, message_id, response).
"""
def track_request(self, request):
"""Track a request via already registered sockets and return
a dict of futures for monitoring all types of responses.
"""
futures = {}
for message_type in self.message_types:
future = futurist.Future()
self._set_future(request.message_id, message_type, future)
futures[message_type] = future
return futures
def untrack_request(self, request):
"""Untrack a request and stop monitoring any responses."""
for message_type in self.message_types:
self._pop_future(request.message_id, message_type)
def stop(self):
self._poller.close()
self._executor.stop()
def _get_future(self, message_id, message_type):
with self._lock:
return self._requests.get((message_id, message_type))
def _set_future(self, message_id, message_type, future):
with self._lock:
self._requests[(message_id, message_type)] = future
def _pop_future(self, message_id, message_type):
with self._lock:
return self._requests.pop((message_id, message_type), None)
def _run_loop(self):
data, socket = self._poller.poll(
timeout=self.conf.oslo_messaging_zmq.rpc_poll_timeout)
if data is None:
return
reply_id, message_type, message_id, response = data
assert message_type in self.message_types, \
"%s is not supported!" % zmq_names.message_type_str(message_type)
future = self._get_future(message_id, message_type)
if future is not None:
LOG.debug("Received %(msg_type)s for %(msg_id)s",
{"msg_type": zmq_names.message_type_str(message_type),
"msg_id": message_id})
future.set_result((reply_id, response))
class ReplyReceiver(ReceiverBase):
message_types = {zmq_names.REPLY_TYPE}
class ReplyReceiverProxy(ReplyReceiver):
def recv_response(self, socket):
empty = socket.recv()
assert empty == b'', "Empty expected!"
reply_id = socket.recv()
assert reply_id is not None, "Reply ID expected!"
message_type = int(socket.recv())
assert message_type == zmq_names.REPLY_TYPE, "Reply expected!"
message_id = socket.recv_string()
reply_body, failure = socket.recv_loaded()
reply = zmq_response.Reply(
message_id=message_id, reply_id=reply_id,
reply_body=reply_body, failure=failure
)
return reply_id, message_type, message_id, reply
class ReplyReceiverDirect(ReplyReceiver):
def recv_response(self, socket):
empty = socket.recv()
assert empty == b'', "Empty expected!"
raw_reply = socket.recv_loaded()
assert isinstance(raw_reply, dict), "Dict expected!"
reply = zmq_response.Reply(**raw_reply)
return reply.reply_id, reply.msg_type, reply.message_id, reply
class AckAndReplyReceiver(ReceiverBase):
message_types = {zmq_names.ACK_TYPE, zmq_names.REPLY_TYPE}
class AckAndReplyReceiverProxy(AckAndReplyReceiver):
def recv_response(self, socket):
empty = socket.recv()
assert empty == b'', "Empty expected!"
reply_id = socket.recv()
assert reply_id is not None, "Reply ID expected!"
message_type = int(socket.recv())
assert message_type in (zmq_names.ACK_TYPE, zmq_names.REPLY_TYPE), \
"Ack or reply expected!"
message_id = socket.recv_string()
if message_type == zmq_names.REPLY_TYPE:
reply_body, failure = socket.recv_loaded()
reply = zmq_response.Reply(
message_id=message_id, reply_id=reply_id,
reply_body=reply_body, failure=failure
)
response = reply
else:
response = None
return reply_id, message_type, message_id, response
class AckAndReplyReceiverDirect(AckAndReplyReceiver):
def recv_response(self, socket):
# acks are not supported yet
empty = socket.recv()
assert empty == b'', "Empty expected!"
raw_reply = socket.recv_loaded()
assert isinstance(raw_reply, dict), "Dict expected!"
reply = zmq_response.Reply(**raw_reply)
return reply.reply_id, reply.msg_type, reply.message_id, reply
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