676 lines
25 KiB
Python
676 lines
25 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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# Copyright 2011 - 2012, 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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"""
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Shared code between AMQP based openstack.common.rpc implementations.
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The code in this module is shared between the rpc implemenations based on AMQP.
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Specifically, this includes impl_kombu and impl_qpid. impl_carrot also uses
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AMQP, but is deprecated and predates this code.
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"""
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import collections
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import inspect
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import sys
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import uuid
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from eventlet import greenpool
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from eventlet import pools
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from eventlet import queue
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from eventlet import semaphore
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# TODO(pekowsk): Remove import cfg and below comment in Havana.
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# This import should no longer be needed when the amqp_rpc_single_reply_queue
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# option is removed.
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from oslo.config import cfg
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from quantum.openstack.common import excutils
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from quantum.openstack.common.gettextutils import _
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from quantum.openstack.common import local
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from quantum.openstack.common import log as logging
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from quantum.openstack.common.rpc import common as rpc_common
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# TODO(pekowski): Remove this option in Havana.
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amqp_opts = [
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cfg.BoolOpt('amqp_rpc_single_reply_queue',
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default=False,
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help='Enable a fast single reply queue if using AMQP based '
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'RPC like RabbitMQ or Qpid.'),
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]
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cfg.CONF.register_opts(amqp_opts)
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UNIQUE_ID = '_unique_id'
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LOG = logging.getLogger(__name__)
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class Pool(pools.Pool):
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"""Class that implements a Pool of Connections."""
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def __init__(self, conf, connection_cls, *args, **kwargs):
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self.connection_cls = connection_cls
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self.conf = conf
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kwargs.setdefault("max_size", self.conf.rpc_conn_pool_size)
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kwargs.setdefault("order_as_stack", True)
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super(Pool, self).__init__(*args, **kwargs)
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self.reply_proxy = None
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# TODO(comstud): Timeout connections not used in a while
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def create(self):
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LOG.debug(_('Pool creating new connection'))
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return self.connection_cls(self.conf)
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def empty(self):
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while self.free_items:
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self.get().close()
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# Force a new connection pool to be created.
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# Note that this was added due to failing unit test cases. The issue
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# is the above "while loop" gets all the cached connections from the
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# pool and closes them, but never returns them to the pool, a pool
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# leak. The unit tests hang waiting for an item to be returned to the
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# pool. The unit tests get here via the teatDown() method. In the run
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# time code, it gets here via cleanup() and only appears in service.py
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# just before doing a sys.exit(), so cleanup() only happens once and
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# the leakage is not a problem.
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self.connection_cls.pool = None
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_pool_create_sem = semaphore.Semaphore()
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def get_connection_pool(conf, connection_cls):
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with _pool_create_sem:
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# Make sure only one thread tries to create the connection pool.
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if not connection_cls.pool:
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connection_cls.pool = Pool(conf, connection_cls)
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return connection_cls.pool
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class ConnectionContext(rpc_common.Connection):
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"""The class that is actually returned to the caller of
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create_connection(). This is essentially a wrapper around
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Connection that supports 'with'. It can also return a new
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Connection, or one from a pool. The function will also catch
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when an instance of this class is to be deleted. With that
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we can return Connections to the pool on exceptions and so
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forth without making the caller be responsible for catching
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them. If possible the function makes sure to return a
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connection to the pool.
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"""
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def __init__(self, conf, connection_pool, pooled=True, server_params=None):
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"""Create a new connection, or get one from the pool"""
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self.connection = None
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self.conf = conf
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self.connection_pool = connection_pool
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if pooled:
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self.connection = connection_pool.get()
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else:
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self.connection = connection_pool.connection_cls(
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conf,
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server_params=server_params)
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self.pooled = pooled
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def __enter__(self):
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"""When with ConnectionContext() is used, return self"""
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return self
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def _done(self):
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"""If the connection came from a pool, clean it up and put it back.
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If it did not come from a pool, close it.
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"""
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if self.connection:
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if self.pooled:
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# Reset the connection so it's ready for the next caller
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# to grab from the pool
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self.connection.reset()
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self.connection_pool.put(self.connection)
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else:
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try:
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self.connection.close()
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except Exception:
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pass
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self.connection = None
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def __exit__(self, exc_type, exc_value, tb):
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"""End of 'with' statement. We're done here."""
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self._done()
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def __del__(self):
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"""Caller is done with this connection. Make sure we cleaned up."""
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self._done()
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def close(self):
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"""Caller is done with this connection."""
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self._done()
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def create_consumer(self, topic, proxy, fanout=False):
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self.connection.create_consumer(topic, proxy, fanout)
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def create_worker(self, topic, proxy, pool_name):
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self.connection.create_worker(topic, proxy, pool_name)
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def join_consumer_pool(self, callback, pool_name, topic, exchange_name):
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self.connection.join_consumer_pool(callback,
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pool_name,
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topic,
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exchange_name)
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def consume_in_thread(self):
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self.connection.consume_in_thread()
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def __getattr__(self, key):
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"""Proxy all other calls to the Connection instance"""
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if self.connection:
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return getattr(self.connection, key)
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else:
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raise rpc_common.InvalidRPCConnectionReuse()
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class ReplyProxy(ConnectionContext):
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""" Connection class for RPC replies / callbacks """
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def __init__(self, conf, connection_pool):
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self._call_waiters = {}
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self._num_call_waiters = 0
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self._num_call_waiters_wrn_threshhold = 10
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self._reply_q = 'reply_' + uuid.uuid4().hex
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super(ReplyProxy, self).__init__(conf, connection_pool, pooled=False)
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self.declare_direct_consumer(self._reply_q, self._process_data)
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self.consume_in_thread()
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def _process_data(self, message_data):
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msg_id = message_data.pop('_msg_id', None)
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waiter = self._call_waiters.get(msg_id)
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if not waiter:
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LOG.warn(_('no calling threads waiting for msg_id : %s'
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', message : %s') % (msg_id, message_data))
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else:
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waiter.put(message_data)
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def add_call_waiter(self, waiter, msg_id):
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self._num_call_waiters += 1
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if self._num_call_waiters > self._num_call_waiters_wrn_threshhold:
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LOG.warn(_('Number of call waiters is greater than warning '
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'threshhold: %d. There could be a MulticallProxyWaiter '
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'leak.') % self._num_call_waiters_wrn_threshhold)
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self._num_call_waiters_wrn_threshhold *= 2
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self._call_waiters[msg_id] = waiter
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def del_call_waiter(self, msg_id):
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self._num_call_waiters -= 1
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del self._call_waiters[msg_id]
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def get_reply_q(self):
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return self._reply_q
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def msg_reply(conf, msg_id, reply_q, connection_pool, reply=None,
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failure=None, ending=False, log_failure=True):
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"""Sends a reply or an error on the channel signified by msg_id.
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Failure should be a sys.exc_info() tuple.
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"""
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with ConnectionContext(conf, connection_pool) as conn:
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if failure:
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failure = rpc_common.serialize_remote_exception(failure,
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log_failure)
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try:
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msg = {'result': reply, 'failure': failure}
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except TypeError:
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msg = {'result': dict((k, repr(v))
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for k, v in reply.__dict__.iteritems()),
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'failure': failure}
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if ending:
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msg['ending'] = True
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_add_unique_id(msg)
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# If a reply_q exists, add the msg_id to the reply and pass the
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# reply_q to direct_send() to use it as the response queue.
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# Otherwise use the msg_id for backward compatibilty.
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if reply_q:
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msg['_msg_id'] = msg_id
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conn.direct_send(reply_q, rpc_common.serialize_msg(msg))
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else:
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conn.direct_send(msg_id, rpc_common.serialize_msg(msg))
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class RpcContext(rpc_common.CommonRpcContext):
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"""Context that supports replying to a rpc.call"""
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def __init__(self, **kwargs):
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self.msg_id = kwargs.pop('msg_id', None)
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self.reply_q = kwargs.pop('reply_q', None)
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self.conf = kwargs.pop('conf')
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super(RpcContext, self).__init__(**kwargs)
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def deepcopy(self):
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values = self.to_dict()
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values['conf'] = self.conf
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values['msg_id'] = self.msg_id
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values['reply_q'] = self.reply_q
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return self.__class__(**values)
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def reply(self, reply=None, failure=None, ending=False,
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connection_pool=None, log_failure=True):
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if self.msg_id:
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msg_reply(self.conf, self.msg_id, self.reply_q, connection_pool,
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reply, failure, ending, log_failure)
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if ending:
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self.msg_id = None
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def unpack_context(conf, msg):
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"""Unpack context from msg."""
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context_dict = {}
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for key in list(msg.keys()):
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# NOTE(vish): Some versions of python don't like unicode keys
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# in kwargs.
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key = str(key)
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if key.startswith('_context_'):
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value = msg.pop(key)
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context_dict[key[9:]] = value
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context_dict['msg_id'] = msg.pop('_msg_id', None)
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context_dict['reply_q'] = msg.pop('_reply_q', None)
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context_dict['conf'] = conf
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ctx = RpcContext.from_dict(context_dict)
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rpc_common._safe_log(LOG.debug, _('unpacked context: %s'), ctx.to_dict())
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return ctx
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def pack_context(msg, context):
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"""Pack context into msg.
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Values for message keys need to be less than 255 chars, so we pull
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context out into a bunch of separate keys. If we want to support
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more arguments in rabbit messages, we may want to do the same
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for args at some point.
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"""
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context_d = dict([('_context_%s' % key, value)
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for (key, value) in context.to_dict().iteritems()])
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msg.update(context_d)
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class _MsgIdCache(object):
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"""This class checks any duplicate messages."""
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# NOTE: This value is considered can be a configuration item, but
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# it is not necessary to change its value in most cases,
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# so let this value as static for now.
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DUP_MSG_CHECK_SIZE = 16
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def __init__(self, **kwargs):
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self.prev_msgids = collections.deque([],
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maxlen=self.DUP_MSG_CHECK_SIZE)
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def check_duplicate_message(self, message_data):
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"""AMQP consumers may read same message twice when exceptions occur
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before ack is returned. This method prevents doing it.
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"""
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if UNIQUE_ID in message_data:
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msg_id = message_data[UNIQUE_ID]
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if msg_id not in self.prev_msgids:
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self.prev_msgids.append(msg_id)
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else:
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raise rpc_common.DuplicateMessageError(msg_id=msg_id)
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def _add_unique_id(msg):
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"""Add unique_id for checking duplicate messages."""
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unique_id = uuid.uuid4().hex
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msg.update({UNIQUE_ID: unique_id})
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LOG.debug(_('UNIQUE_ID is %s.') % (unique_id))
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class _ThreadPoolWithWait(object):
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"""Base class for a delayed invocation manager used by
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the Connection class to start up green threads
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to handle incoming messages.
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"""
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def __init__(self, conf, connection_pool):
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self.pool = greenpool.GreenPool(conf.rpc_thread_pool_size)
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self.connection_pool = connection_pool
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self.conf = conf
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def wait(self):
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"""Wait for all callback threads to exit."""
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self.pool.waitall()
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class CallbackWrapper(_ThreadPoolWithWait):
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"""Wraps a straight callback to allow it to be invoked in a green
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thread.
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"""
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def __init__(self, conf, callback, connection_pool):
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"""
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:param conf: cfg.CONF instance
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:param callback: a callable (probably a function)
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:param connection_pool: connection pool as returned by
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get_connection_pool()
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"""
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super(CallbackWrapper, self).__init__(
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conf=conf,
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connection_pool=connection_pool,
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)
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self.callback = callback
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def __call__(self, message_data):
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self.pool.spawn_n(self.callback, message_data)
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class ProxyCallback(_ThreadPoolWithWait):
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"""Calls methods on a proxy object based on method and args."""
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def __init__(self, conf, proxy, connection_pool):
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super(ProxyCallback, self).__init__(
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conf=conf,
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connection_pool=connection_pool,
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)
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self.proxy = proxy
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self.msg_id_cache = _MsgIdCache()
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def __call__(self, message_data):
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"""Consumer callback to call a method on a proxy object.
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Parses the message for validity and fires off a thread to call the
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proxy object method.
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Message data should be a dictionary with two keys:
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method: string representing the method to call
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args: dictionary of arg: value
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Example: {'method': 'echo', 'args': {'value': 42}}
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"""
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# It is important to clear the context here, because at this point
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# the previous context is stored in local.store.context
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if hasattr(local.store, 'context'):
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del local.store.context
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rpc_common._safe_log(LOG.debug, _('received %s'), message_data)
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self.msg_id_cache.check_duplicate_message(message_data)
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ctxt = unpack_context(self.conf, message_data)
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method = message_data.get('method')
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args = message_data.get('args', {})
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version = message_data.get('version', None)
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if not method:
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LOG.warn(_('no method for message: %s') % message_data)
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ctxt.reply(_('No method for message: %s') % message_data,
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connection_pool=self.connection_pool)
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return
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self.pool.spawn_n(self._process_data, ctxt, version, method, args)
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def _process_data(self, ctxt, version, method, args):
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"""Process a message in a new thread.
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If the proxy object we have has a dispatch method
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(see rpc.dispatcher.RpcDispatcher), pass it the version,
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method, and args and let it dispatch as appropriate. If not, use
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the old behavior of magically calling the specified method on the
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proxy we have here.
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"""
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ctxt.update_store()
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try:
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rval = self.proxy.dispatch(ctxt, version, method, **args)
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# Check if the result was a generator
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if inspect.isgenerator(rval):
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for x in rval:
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ctxt.reply(x, None, connection_pool=self.connection_pool)
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else:
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ctxt.reply(rval, None, connection_pool=self.connection_pool)
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# This final None tells multicall that it is done.
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ctxt.reply(ending=True, connection_pool=self.connection_pool)
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except rpc_common.ClientException as e:
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LOG.debug(_('Expected exception during message handling (%s)') %
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e._exc_info[1])
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ctxt.reply(None, e._exc_info,
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connection_pool=self.connection_pool,
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log_failure=False)
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except Exception:
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# sys.exc_info() is deleted by LOG.exception().
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exc_info = sys.exc_info()
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LOG.error(_('Exception during message handling'),
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exc_info=exc_info)
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ctxt.reply(None, exc_info, connection_pool=self.connection_pool)
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class MulticallProxyWaiter(object):
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def __init__(self, conf, msg_id, timeout, connection_pool):
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self._msg_id = msg_id
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self._timeout = timeout or conf.rpc_response_timeout
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self._reply_proxy = connection_pool.reply_proxy
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self._done = False
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self._got_ending = False
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self._conf = conf
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self._dataqueue = queue.LightQueue()
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# Add this caller to the reply proxy's call_waiters
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self._reply_proxy.add_call_waiter(self, self._msg_id)
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self.msg_id_cache = _MsgIdCache()
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def put(self, data):
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self._dataqueue.put(data)
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def done(self):
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if self._done:
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return
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self._done = True
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# Remove this caller from reply proxy's call_waiters
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self._reply_proxy.del_call_waiter(self._msg_id)
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def _process_data(self, data):
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result = None
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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(self._conf,
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failure)
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elif data.get('ending', False):
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self._got_ending = True
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else:
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result = data['result']
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return result
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def __iter__(self):
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"""Return a result until we get a reply with an 'ending" flag"""
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if self._done:
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raise StopIteration
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while True:
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try:
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data = self._dataqueue.get(timeout=self._timeout)
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result = self._process_data(data)
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except queue.Empty:
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LOG.exception(_('Timed out waiting for RPC response.'))
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self.done()
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raise rpc_common.Timeout()
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except Exception:
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with excutils.save_and_reraise_exception():
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self.done()
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if self._got_ending:
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self.done()
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raise StopIteration
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if isinstance(result, Exception):
|
|
self.done()
|
|
raise result
|
|
yield result
|
|
|
|
|
|
#TODO(pekowski): Remove MulticallWaiter() in Havana.
|
|
class MulticallWaiter(object):
|
|
def __init__(self, conf, connection, timeout):
|
|
self._connection = connection
|
|
self._iterator = connection.iterconsume(timeout=timeout or
|
|
conf.rpc_response_timeout)
|
|
self._result = None
|
|
self._done = False
|
|
self._got_ending = False
|
|
self._conf = conf
|
|
self.msg_id_cache = _MsgIdCache()
|
|
|
|
def done(self):
|
|
if self._done:
|
|
return
|
|
self._done = True
|
|
self._iterator.close()
|
|
self._iterator = None
|
|
self._connection.close()
|
|
|
|
def __call__(self, data):
|
|
"""The consume() callback will call this. Store the result."""
|
|
self.msg_id_cache.check_duplicate_message(data)
|
|
if data['failure']:
|
|
failure = data['failure']
|
|
self._result = rpc_common.deserialize_remote_exception(self._conf,
|
|
failure)
|
|
|
|
elif data.get('ending', False):
|
|
self._got_ending = True
|
|
else:
|
|
self._result = data['result']
|
|
|
|
def __iter__(self):
|
|
"""Return a result until we get a 'None' response from consumer"""
|
|
if self._done:
|
|
raise StopIteration
|
|
while True:
|
|
try:
|
|
self._iterator.next()
|
|
except Exception:
|
|
with excutils.save_and_reraise_exception():
|
|
self.done()
|
|
if self._got_ending:
|
|
self.done()
|
|
raise StopIteration
|
|
result = self._result
|
|
if isinstance(result, Exception):
|
|
self.done()
|
|
raise result
|
|
yield result
|
|
|
|
|
|
def create_connection(conf, new, connection_pool):
|
|
"""Create a connection"""
|
|
return ConnectionContext(conf, connection_pool, pooled=not new)
|
|
|
|
|
|
_reply_proxy_create_sem = semaphore.Semaphore()
|
|
|
|
|
|
def multicall(conf, context, topic, msg, timeout, connection_pool):
|
|
"""Make a call that returns multiple times."""
|
|
# TODO(pekowski): Remove all these comments in Havana.
|
|
# For amqp_rpc_single_reply_queue = False,
|
|
# Can't use 'with' for multicall, as it returns an iterator
|
|
# that will continue to use the connection. When it's done,
|
|
# connection.close() will get called which will put it back into
|
|
# the pool
|
|
# For amqp_rpc_single_reply_queue = True,
|
|
# The 'with' statement is mandatory for closing the connection
|
|
LOG.debug(_('Making synchronous call on %s ...'), topic)
|
|
msg_id = uuid.uuid4().hex
|
|
msg.update({'_msg_id': msg_id})
|
|
LOG.debug(_('MSG_ID is %s') % (msg_id))
|
|
_add_unique_id(msg)
|
|
pack_context(msg, context)
|
|
|
|
# TODO(pekowski): Remove this flag and the code under the if clause
|
|
# in Havana.
|
|
if not conf.amqp_rpc_single_reply_queue:
|
|
conn = ConnectionContext(conf, connection_pool)
|
|
wait_msg = MulticallWaiter(conf, conn, timeout)
|
|
conn.declare_direct_consumer(msg_id, wait_msg)
|
|
conn.topic_send(topic, rpc_common.serialize_msg(msg), timeout)
|
|
else:
|
|
with _reply_proxy_create_sem:
|
|
if not connection_pool.reply_proxy:
|
|
connection_pool.reply_proxy = ReplyProxy(conf, connection_pool)
|
|
msg.update({'_reply_q': connection_pool.reply_proxy.get_reply_q()})
|
|
wait_msg = MulticallProxyWaiter(conf, msg_id, timeout, connection_pool)
|
|
with ConnectionContext(conf, connection_pool) as conn:
|
|
conn.topic_send(topic, rpc_common.serialize_msg(msg), timeout)
|
|
return wait_msg
|
|
|
|
|
|
def call(conf, context, topic, msg, timeout, connection_pool):
|
|
"""Sends a message on a topic and wait for a response."""
|
|
rv = multicall(conf, context, topic, msg, timeout, connection_pool)
|
|
# NOTE(vish): return the last result from the multicall
|
|
rv = list(rv)
|
|
if not rv:
|
|
return
|
|
return rv[-1]
|
|
|
|
|
|
def cast(conf, context, topic, msg, connection_pool):
|
|
"""Sends a message on a topic without waiting for a response."""
|
|
LOG.debug(_('Making asynchronous cast on %s...'), topic)
|
|
_add_unique_id(msg)
|
|
pack_context(msg, context)
|
|
with ConnectionContext(conf, connection_pool) as conn:
|
|
conn.topic_send(topic, rpc_common.serialize_msg(msg))
|
|
|
|
|
|
def fanout_cast(conf, context, topic, msg, connection_pool):
|
|
"""Sends a message on a fanout exchange without waiting for a response."""
|
|
LOG.debug(_('Making asynchronous fanout cast...'))
|
|
_add_unique_id(msg)
|
|
pack_context(msg, context)
|
|
with ConnectionContext(conf, connection_pool) as conn:
|
|
conn.fanout_send(topic, rpc_common.serialize_msg(msg))
|
|
|
|
|
|
def cast_to_server(conf, context, server_params, topic, msg, connection_pool):
|
|
"""Sends a message on a topic to a specific server."""
|
|
_add_unique_id(msg)
|
|
pack_context(msg, context)
|
|
with ConnectionContext(conf, connection_pool, pooled=False,
|
|
server_params=server_params) as conn:
|
|
conn.topic_send(topic, rpc_common.serialize_msg(msg))
|
|
|
|
|
|
def fanout_cast_to_server(conf, context, server_params, topic, msg,
|
|
connection_pool):
|
|
"""Sends a message on a fanout exchange to a specific server."""
|
|
_add_unique_id(msg)
|
|
pack_context(msg, context)
|
|
with ConnectionContext(conf, connection_pool, pooled=False,
|
|
server_params=server_params) as conn:
|
|
conn.fanout_send(topic, rpc_common.serialize_msg(msg))
|
|
|
|
|
|
def notify(conf, context, topic, msg, connection_pool, envelope):
|
|
"""Sends a notification event on a topic."""
|
|
LOG.debug(_('Sending %(event_type)s on %(topic)s'),
|
|
dict(event_type=msg.get('event_type'),
|
|
topic=topic))
|
|
_add_unique_id(msg)
|
|
pack_context(msg, context)
|
|
with ConnectionContext(conf, connection_pool) as conn:
|
|
if envelope:
|
|
msg = rpc_common.serialize_msg(msg, force_envelope=True)
|
|
conn.notify_send(topic, msg)
|
|
|
|
|
|
def cleanup(connection_pool):
|
|
if connection_pool:
|
|
connection_pool.empty()
|
|
|
|
|
|
def get_control_exchange(conf):
|
|
return conf.control_exchange
|