693 lines
27 KiB
Python
693 lines
27 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 logging
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import threading
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import time
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import uuid
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import cachetools
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from oslo_utils import timeutils
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from six import moves
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import oslo_messaging
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from oslo_messaging._drivers import amqp as rpc_amqp
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from oslo_messaging._drivers import base
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from oslo_messaging._drivers import common as rpc_common
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from oslo_messaging import MessageDeliveryFailure
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__all__ = ['AMQPDriverBase']
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LOG = logging.getLogger(__name__)
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# Minimum/Maximum sleep between a poll and ack/requeue
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# Maximum should be small enough to not get rejected ack,
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# minimum should be big enough to not burn the CPU.
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ACK_REQUEUE_EVERY_SECONDS_MIN = 0.001
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ACK_REQUEUE_EVERY_SECONDS_MAX = 1.0
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class MessageOperationsHandler(object):
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"""Queue used by message operations to ensure that all tasks are
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serialized and run in the same thread, since underlying drivers like kombu
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are not thread safe.
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"""
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def __init__(self, name):
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self.name = "%s (%s)" % (name, hex(id(self)))
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self._tasks = moves.queue.Queue()
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self._shutdown = threading.Event()
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self._shutdown_thread = threading.Thread(
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target=self._process_in_background)
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self._shutdown_thread.daemon = True
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def stop(self):
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self._shutdown.set()
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def process_in_background(self):
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"""Run all pending tasks queued by do() in an thread during the
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shutdown process.
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"""
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self._shutdown_thread.start()
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def _process_in_background(self):
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while not self._shutdown.is_set():
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self.process()
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time.sleep(ACK_REQUEUE_EVERY_SECONDS_MIN)
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def process(self):
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"Run all pending tasks queued by do()."
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while True:
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try:
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task = self._tasks.get(block=False)
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except moves.queue.Empty:
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break
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task()
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def do(self, task):
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"Put the task in the queue."
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self._tasks.put(task)
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class AMQPIncomingMessage(base.RpcIncomingMessage):
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def __init__(self, listener, ctxt, message, unique_id, msg_id, reply_q,
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client_timeout, obsolete_reply_queues,
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message_operations_handler):
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super(AMQPIncomingMessage, self).__init__(ctxt, message)
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self.listener = listener
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self.unique_id = unique_id
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self.msg_id = msg_id
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self.reply_q = reply_q
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self.client_timeout = client_timeout
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self._obsolete_reply_queues = obsolete_reply_queues
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self._message_operations_handler = message_operations_handler
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self.stopwatch = timeutils.StopWatch()
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self.stopwatch.start()
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def _send_reply(self, conn, reply=None, failure=None, ending=True):
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if not self._obsolete_reply_queues.reply_q_valid(self.reply_q,
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self.msg_id):
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return
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if failure:
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failure = rpc_common.serialize_remote_exception(failure)
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# NOTE(sileht): ending can be removed in N*, see Listener.wait()
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# for more detail.
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msg = {'result': reply, 'failure': failure, 'ending': ending,
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'_msg_id': self.msg_id}
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rpc_amqp._add_unique_id(msg)
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unique_id = msg[rpc_amqp.UNIQUE_ID]
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LOG.debug("sending reply msg_id: %(msg_id)s "
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"reply queue: %(reply_q)s "
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"time elapsed: %(elapsed)ss", {
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'msg_id': self.msg_id,
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'unique_id': unique_id,
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'reply_q': self.reply_q,
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'elapsed': self.stopwatch.elapsed()})
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conn.direct_send(self.reply_q, rpc_common.serialize_msg(msg))
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def reply(self, reply=None, failure=None):
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if not self.msg_id:
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# NOTE(Alexei_987) not sending reply, if msg_id is empty
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# because reply should not be expected by caller side
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return
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# NOTE(sileht): return without hold the a connection if possible
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if not self._obsolete_reply_queues.reply_q_valid(self.reply_q,
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self.msg_id):
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return
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# NOTE(sileht): we read the configuration value from the driver
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# to be able to backport this change in previous version that
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# still have the qpid driver
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duration = self.listener.driver.missing_destination_retry_timeout
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timer = rpc_common.DecayingTimer(duration=duration)
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timer.start()
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while True:
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try:
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with self.listener.driver._get_connection(
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rpc_common.PURPOSE_SEND) as conn:
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self._send_reply(conn, reply, failure)
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return
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except rpc_amqp.AMQPDestinationNotFound:
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if timer.check_return() > 0:
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LOG.debug(("The reply %(msg_id)s cannot be sent "
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"%(reply_q)s reply queue don't exist, "
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"retrying..."), {
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'msg_id': self.msg_id,
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'reply_q': self.reply_q})
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time.sleep(0.25)
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else:
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self._obsolete_reply_queues.add(self.reply_q, self.msg_id)
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infos = {
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'msg_id': self.msg_id,
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'reply_q': self.reply_q,
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'duration': duration
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}
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LOG.info("The reply %(msg_id)s cannot be sent "
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"%(reply_q)s reply queue don't exist after "
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"%(duration)s sec abandoning...", infos)
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return
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def heartbeat(self):
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# generate a keep alive for RPC call monitoring
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with self.listener.driver._get_connection(
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rpc_common.PURPOSE_SEND) as conn:
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try:
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self._send_reply(conn, None, None, ending=False)
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except rpc_amqp.AMQPDestinationNotFound:
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# internal exception that indicates queue/exchange gone -
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# broker unreachable.
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raise MessageDeliveryFailure("Heartbeat send failed")
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# NOTE(sileht): Those have already be ack in RpcListener IO thread
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# We keep them as noop until all drivers do the same
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def acknowledge(self):
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pass
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def requeue(self):
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pass
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class NotificationAMQPIncomingMessage(AMQPIncomingMessage):
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def acknowledge(self):
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def _do_ack():
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try:
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self.message.acknowledge()
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except Exception as exc:
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# NOTE(kgiusti): this failure is likely due to a loss of the
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# connection to the broker. Not much we can do in this case,
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# especially considering the Notification has already been
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# dispatched. This *could* result in message duplication
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# (unacked msg is returned to the queue by the broker), but the
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# driver tries to catch that using the msg_id_cache.
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LOG.warning("Failed to acknowledge received message: %s", exc)
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self._message_operations_handler.do(_do_ack)
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self.listener.msg_id_cache.add(self.unique_id)
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def requeue(self):
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# NOTE(sileht): In case of the connection is lost between receiving the
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# message and requeing it, this requeue call fail
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# but because the message is not acknowledged and not added to the
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# msg_id_cache, the message will be reconsumed, the only difference is
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# the message stay at the beginning of the queue instead of moving to
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# the end.
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def _do_requeue():
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try:
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self.message.requeue()
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except Exception as exc:
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LOG.warning("Failed to requeue received message: %s", exc)
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self._message_operations_handler.do(_do_requeue)
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class ObsoleteReplyQueuesCache(object):
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"""Cache of reply queue id that doesn't exists anymore.
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NOTE(sileht): In case of a broker restart/failover
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a reply queue can be unreachable for short period
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the IncomingMessage.send_reply will block for 60 seconds
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in this case or until rabbit recovers.
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But in case of the reply queue is unreachable because the
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rpc client is really gone, we can have a ton of reply to send
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waiting 60 seconds.
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This leads to a starvation of connection of the pool
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The rpc server take to much time to send reply, other rpc client will
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raise TimeoutError because their don't receive their replies in time.
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This object cache stores already known gone client to not wait 60 seconds
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and hold a connection of the pool.
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Keeping 200 last gone rpc client for 1 minute is enough
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and doesn't hold to much memory.
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"""
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SIZE = 200
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TTL = 60
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def __init__(self):
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self._lock = threading.RLock()
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self._cache = cachetools.TTLCache(self.SIZE, self.TTL)
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def reply_q_valid(self, reply_q, msg_id):
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if reply_q in self._cache:
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self._no_reply_log(reply_q, msg_id)
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return False
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return True
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def add(self, reply_q, msg_id):
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with self._lock:
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self._cache.update({reply_q: msg_id})
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self._no_reply_log(reply_q, msg_id)
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def _no_reply_log(self, reply_q, msg_id):
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LOG.warning("%(reply_queue)s doesn't exists, drop reply to "
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"%(msg_id)s", {'reply_queue': reply_q, "msg_id": msg_id})
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class AMQPListener(base.PollStyleListener):
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def __init__(self, driver, conn):
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super(AMQPListener, self).__init__(driver.prefetch_size)
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self.driver = driver
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self.conn = conn
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self.msg_id_cache = rpc_amqp._MsgIdCache()
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self.incoming = []
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self._shutdown = threading.Event()
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self._shutoff = threading.Event()
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self._obsolete_reply_queues = ObsoleteReplyQueuesCache()
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self._message_operations_handler = MessageOperationsHandler(
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"AMQPListener")
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self._current_timeout = ACK_REQUEUE_EVERY_SECONDS_MIN
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def __call__(self, message):
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ctxt = rpc_amqp.unpack_context(message)
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unique_id = self.msg_id_cache.check_duplicate_message(message)
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if ctxt.msg_id:
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LOG.debug("received message msg_id: %(msg_id)s reply to "
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"%(queue)s", {'queue': ctxt.reply_q,
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'msg_id': ctxt.msg_id})
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else:
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LOG.debug("received message with unique_id: %s", unique_id)
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self.incoming.append(self.message_cls(
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self,
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ctxt.to_dict(),
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message,
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unique_id,
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ctxt.msg_id,
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ctxt.reply_q,
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ctxt.client_timeout,
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self._obsolete_reply_queues,
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self._message_operations_handler))
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@base.batch_poll_helper
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def poll(self, timeout=None):
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stopwatch = timeutils.StopWatch(duration=timeout).start()
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while not self._shutdown.is_set():
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self._message_operations_handler.process()
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if self.incoming:
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return self.incoming.pop(0)
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left = stopwatch.leftover(return_none=True)
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if left is None:
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left = self._current_timeout
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if left <= 0:
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return None
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try:
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self.conn.consume(timeout=min(self._current_timeout, left))
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except rpc_common.Timeout:
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self._current_timeout = max(self._current_timeout * 2,
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ACK_REQUEUE_EVERY_SECONDS_MAX)
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else:
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self._current_timeout = ACK_REQUEUE_EVERY_SECONDS_MIN
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# NOTE(sileht): listener is stopped, just processes remaining messages
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# and operations
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self._message_operations_handler.process()
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if self.incoming:
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return self.incoming.pop(0)
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self._shutoff.set()
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def stop(self):
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self._shutdown.set()
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self.conn.stop_consuming()
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self._shutoff.wait()
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# NOTE(sileht): Here, the listener is stopped, but some incoming
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# messages may still live on server side, because callback is still
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# running and message is not yet ack/requeue. It's safe to do the ack
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# into another thread, side the polling thread is now terminated.
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self._message_operations_handler.process_in_background()
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def cleanup(self):
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# NOTE(sileht): server executor is now stopped, we are sure that no
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# more incoming messages in live, we can acknowledge
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# remaining messages and stop the thread
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self._message_operations_handler.stop()
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# Closes listener connection
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self.conn.close()
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class RpcAMQPListener(AMQPListener):
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message_cls = AMQPIncomingMessage
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def __call__(self, message):
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# NOTE(kgiusti): In the original RPC implementation the RPC server
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# would acknowledge the request THEN process it. The goal of this was
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# to prevent duplication if the ack failed. Should the ack fail the
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# request would be discarded since the broker would not remove the
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# request from the queue since no ack was received. That would lead to
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# the request being redelivered at some point. However this approach
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# meant that the ack was issued from the dispatch thread, not the
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# consumer thread, which is bad since kombu is not thread safe. So a
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# change was made to schedule the ack to be sent on the consumer thread
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# - breaking the ability to catch ack errors before dispatching the
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# request. To fix this we do the actual ack here in the consumer
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# callback and avoid the upcall if the ack fails. See
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# https://bugs.launchpad.net/oslo.messaging/+bug/1695746
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# for all the gory details...
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try:
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message.acknowledge()
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except Exception as exc:
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LOG.warning("Discarding RPC request due to failed acknowledge: %s",
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exc)
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else:
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# NOTE(kgiusti): be aware that even if the acknowledge call
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# succeeds there is no guarantee the broker actually gets the ACK
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# since acknowledge() simply writes the ACK to the socket (there is
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# no ACK confirmation coming back from the broker)
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super(RpcAMQPListener, self).__call__(message)
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class NotificationAMQPListener(AMQPListener):
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message_cls = NotificationAMQPIncomingMessage
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class ReplyWaiters(object):
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def __init__(self):
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self._queues = {}
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self._wrn_threshold = 10
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def get(self, msg_id, timeout):
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try:
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return self._queues[msg_id].get(block=True, timeout=timeout)
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except moves.queue.Empty:
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raise oslo_messaging.MessagingTimeout(
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'Timed out waiting for a reply '
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'to message ID %s' % msg_id)
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def put(self, msg_id, message_data):
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queue = self._queues.get(msg_id)
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if not queue:
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LOG.info('No calling threads waiting for msg_id : %s', msg_id)
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LOG.debug(' queues: %(queues)s, message: %(message)s',
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{'queues': len(self._queues), 'message': message_data})
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else:
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queue.put(message_data)
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def add(self, msg_id):
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self._queues[msg_id] = moves.queue.Queue()
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queues_length = len(self._queues)
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if queues_length > self._wrn_threshold:
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LOG.warning('Number of call queues is %(queues_length)s, '
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'greater than warning threshold: %(old_threshold)s. '
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'There could be a leak. Increasing threshold to: '
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'%(threshold)s',
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{'queues_length': queues_length,
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'old_threshold': self._wrn_threshold,
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'threshold': self._wrn_threshold * 2})
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self._wrn_threshold *= 2
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def remove(self, msg_id):
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del self._queues[msg_id]
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class ReplyWaiter(object):
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def __init__(self, reply_q, conn, allowed_remote_exmods):
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self.conn = conn
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self.allowed_remote_exmods = allowed_remote_exmods
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self.msg_id_cache = rpc_amqp._MsgIdCache()
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self.waiters = ReplyWaiters()
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self.conn.declare_direct_consumer(reply_q, self)
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self._thread_exit_event = threading.Event()
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self._thread = threading.Thread(target=self.poll)
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self._thread.daemon = True
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self._thread.start()
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def stop(self):
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if self._thread:
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self._thread_exit_event.set()
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self.conn.stop_consuming()
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self._thread.join()
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self._thread = None
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def poll(self):
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current_timeout = ACK_REQUEUE_EVERY_SECONDS_MIN
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while not self._thread_exit_event.is_set():
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try:
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# ack every ACK_REQUEUE_EVERY_SECONDS_MAX seconds
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self.conn.consume(timeout=current_timeout)
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except rpc_common.Timeout:
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current_timeout = max(current_timeout * 2,
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ACK_REQUEUE_EVERY_SECONDS_MAX)
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except Exception:
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LOG.exception("Failed to process incoming message, retrying..")
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else:
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current_timeout = ACK_REQUEUE_EVERY_SECONDS_MIN
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def __call__(self, message):
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# NOTE(sileht): __call__ is running within the polling thread,
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# (conn.consume -> conn.conn.drain_events() -> __call__ callback)
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# it's threadsafe to acknowledge the message here, no need to wait
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# the next polling
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message.acknowledge()
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incoming_msg_id = message.pop('_msg_id', None)
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if message.get('ending'):
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LOG.debug("received reply msg_id: %s", incoming_msg_id)
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self.waiters.put(incoming_msg_id, message)
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def listen(self, msg_id):
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self.waiters.add(msg_id)
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def unlisten(self, msg_id):
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self.waiters.remove(msg_id)
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@staticmethod
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def _raise_timeout_exception(msg_id):
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raise oslo_messaging.MessagingTimeout(
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'Timed out waiting for a reply to message ID %s.', msg_id)
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def _process_reply(self, data):
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self.msg_id_cache.check_duplicate_message(data)
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if data['failure']:
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failure = data['failure']
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result = rpc_common.deserialize_remote_exception(
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failure, self.allowed_remote_exmods)
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else:
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result = data.get('result', None)
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ending = data.get('ending', False)
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return result, ending
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def wait(self, msg_id, timeout, call_monitor_timeout):
|
|
# NOTE(sileht): for each msg_id we receive two amqp message
|
|
# first one with the payload, a second one to ensure the other
|
|
# have finish to send the payload
|
|
# NOTE(viktors): We are going to remove this behavior in the N
|
|
# release, but we need to keep backward compatibility, so we should
|
|
# support both cases for now.
|
|
timer = rpc_common.DecayingTimer(duration=timeout)
|
|
timer.start()
|
|
if call_monitor_timeout:
|
|
call_monitor_timer = rpc_common.DecayingTimer(
|
|
duration=call_monitor_timeout)
|
|
call_monitor_timer.start()
|
|
else:
|
|
call_monitor_timer = None
|
|
final_reply = None
|
|
ending = False
|
|
while not ending:
|
|
timeout = timer.check_return(self._raise_timeout_exception, msg_id)
|
|
if call_monitor_timer and timeout > 0:
|
|
cm_timeout = call_monitor_timer.check_return(
|
|
self._raise_timeout_exception, msg_id)
|
|
if cm_timeout < timeout:
|
|
timeout = cm_timeout
|
|
try:
|
|
message = self.waiters.get(msg_id, timeout=timeout)
|
|
except moves.queue.Empty:
|
|
self._raise_timeout_exception(msg_id)
|
|
|
|
reply, ending = self._process_reply(message)
|
|
if reply is not None:
|
|
# NOTE(viktors): This can be either first _send_reply() with an
|
|
# empty `result` field or a second _send_reply() with
|
|
# ending=True and no `result` field.
|
|
final_reply = reply
|
|
elif ending is False:
|
|
LOG.debug('Call monitor heartbeat received; '
|
|
'renewing timeout timer')
|
|
call_monitor_timer.restart()
|
|
return final_reply
|
|
|
|
|
|
class AMQPDriverBase(base.BaseDriver):
|
|
missing_destination_retry_timeout = 0
|
|
|
|
def __init__(self, conf, url, connection_pool,
|
|
default_exchange=None, allowed_remote_exmods=None):
|
|
super(AMQPDriverBase, self).__init__(conf, url, default_exchange,
|
|
allowed_remote_exmods)
|
|
|
|
self._default_exchange = default_exchange
|
|
|
|
self._connection_pool = connection_pool
|
|
|
|
self._reply_q_lock = threading.Lock()
|
|
self._reply_q = None
|
|
self._reply_q_conn = None
|
|
self._waiter = None
|
|
|
|
def _get_exchange(self, target):
|
|
return target.exchange or self._default_exchange
|
|
|
|
def _get_connection(self, purpose=rpc_common.PURPOSE_SEND):
|
|
return rpc_common.ConnectionContext(self._connection_pool,
|
|
purpose=purpose)
|
|
|
|
def _get_reply_q(self):
|
|
with self._reply_q_lock:
|
|
if self._reply_q is not None:
|
|
return self._reply_q
|
|
|
|
reply_q = 'reply_' + uuid.uuid4().hex
|
|
|
|
conn = self._get_connection(rpc_common.PURPOSE_LISTEN)
|
|
|
|
self._waiter = ReplyWaiter(reply_q, conn,
|
|
self._allowed_remote_exmods)
|
|
|
|
self._reply_q = reply_q
|
|
self._reply_q_conn = conn
|
|
|
|
return self._reply_q
|
|
|
|
def _send(self, target, ctxt, message,
|
|
wait_for_reply=None, timeout=None, call_monitor_timeout=None,
|
|
envelope=True, notify=False, retry=None, transport_options=None):
|
|
|
|
msg = message
|
|
|
|
if wait_for_reply:
|
|
msg_id = uuid.uuid4().hex
|
|
msg.update({'_msg_id': msg_id})
|
|
msg.update({'_reply_q': self._get_reply_q()})
|
|
msg.update({'_timeout': call_monitor_timeout})
|
|
|
|
rpc_amqp._add_unique_id(msg)
|
|
unique_id = msg[rpc_amqp.UNIQUE_ID]
|
|
|
|
rpc_amqp.pack_context(msg, ctxt)
|
|
|
|
if envelope:
|
|
msg = rpc_common.serialize_msg(msg)
|
|
|
|
if wait_for_reply:
|
|
self._waiter.listen(msg_id)
|
|
log_msg = "CALL msg_id: %s " % msg_id
|
|
else:
|
|
log_msg = "CAST unique_id: %s " % unique_id
|
|
|
|
try:
|
|
with self._get_connection(rpc_common.PURPOSE_SEND) as conn:
|
|
if notify:
|
|
exchange = self._get_exchange(target)
|
|
LOG.debug(log_msg + "NOTIFY exchange '%(exchange)s'"
|
|
" topic '%(topic)s'", {'exchange': exchange,
|
|
'topic': target.topic})
|
|
conn.notify_send(exchange, target.topic, msg, retry=retry)
|
|
elif target.fanout:
|
|
log_msg += "FANOUT topic '%(topic)s'" % {
|
|
'topic': target.topic}
|
|
LOG.debug(log_msg)
|
|
conn.fanout_send(target.topic, msg, retry=retry)
|
|
else:
|
|
topic = target.topic
|
|
exchange = self._get_exchange(target)
|
|
if target.server:
|
|
topic = '%s.%s' % (target.topic, target.server)
|
|
LOG.debug(log_msg + "exchange '%(exchange)s'"
|
|
" topic '%(topic)s'", {'exchange': exchange,
|
|
'topic': topic})
|
|
conn.topic_send(exchange_name=exchange, topic=topic,
|
|
msg=msg, timeout=timeout, retry=retry,
|
|
transport_options=transport_options)
|
|
|
|
if wait_for_reply:
|
|
result = self._waiter.wait(msg_id, timeout,
|
|
call_monitor_timeout)
|
|
if isinstance(result, Exception):
|
|
raise result
|
|
return result
|
|
finally:
|
|
if wait_for_reply:
|
|
self._waiter.unlisten(msg_id)
|
|
|
|
def send(self, target, ctxt, message, wait_for_reply=None, timeout=None,
|
|
call_monitor_timeout=None, retry=None, transport_options=None):
|
|
return self._send(target, ctxt, message, wait_for_reply, timeout,
|
|
call_monitor_timeout, retry=retry,
|
|
transport_options=transport_options)
|
|
|
|
def send_notification(self, target, ctxt, message, version, retry=None):
|
|
return self._send(target, ctxt, message,
|
|
envelope=(version == 2.0), notify=True, retry=retry)
|
|
|
|
def listen(self, target, batch_size, batch_timeout):
|
|
conn = self._get_connection(rpc_common.PURPOSE_LISTEN)
|
|
|
|
listener = RpcAMQPListener(self, conn)
|
|
|
|
conn.declare_topic_consumer(exchange_name=self._get_exchange(target),
|
|
topic=target.topic,
|
|
callback=listener)
|
|
conn.declare_topic_consumer(exchange_name=self._get_exchange(target),
|
|
topic='%s.%s' % (target.topic,
|
|
target.server),
|
|
callback=listener)
|
|
conn.declare_fanout_consumer(target.topic, listener)
|
|
|
|
return base.PollStyleListenerAdapter(listener, batch_size,
|
|
batch_timeout)
|
|
|
|
def listen_for_notifications(self, targets_and_priorities, pool,
|
|
batch_size, batch_timeout):
|
|
conn = self._get_connection(rpc_common.PURPOSE_LISTEN)
|
|
|
|
listener = NotificationAMQPListener(self, conn)
|
|
for target, priority in targets_and_priorities:
|
|
conn.declare_topic_consumer(
|
|
exchange_name=self._get_exchange(target),
|
|
topic='%s.%s' % (target.topic, priority),
|
|
callback=listener, queue_name=pool)
|
|
return base.PollStyleListenerAdapter(listener, batch_size,
|
|
batch_timeout)
|
|
|
|
def cleanup(self):
|
|
if self._connection_pool:
|
|
self._connection_pool.empty()
|
|
self._connection_pool = None
|
|
|
|
with self._reply_q_lock:
|
|
if self._reply_q is not None:
|
|
self._waiter.stop()
|
|
self._reply_q_conn.close()
|
|
self._reply_q_conn = None
|
|
self._reply_q = None
|
|
self._waiter = None
|