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OpenStack Study: amqp.py**** CubicPower OpenStack Study ****
# Copyright 2010 United States Government as represented by the # Administrator of the National Aeronautics and Space Administration. # All Rights Reserved. # Copyright 2011 - 2012, Red Hat, Inc. # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. """ Shared code between AMQP based openstack.common.rpc implementations. The code in this module is shared between the rpc implementations based on AMQP. Specifically, this includes impl_kombu and impl_qpid. impl_carrot also uses AMQP, but is deprecated and predates this code. """ import collections import inspect import sys import uuid from eventlet import greenpool from eventlet import pools from eventlet import queue from eventlet import semaphore from oslo.config import cfg import six from neutron.openstack.common import excutils from neutron.openstack.common.gettextutils import _, _LE from neutron.openstack.common import local from neutron.openstack.common import log as logging from neutron.openstack.common.rpc import common as rpc_common amqp_opts = [ cfg.BoolOpt('amqp_durable_queues', default=False, deprecated_name='rabbit_durable_queues', deprecated_group='DEFAULT', help='Use durable queues in amqp.'), cfg.BoolOpt('amqp_auto_delete', default=False, help='Auto-delete queues in amqp.'), ] cfg.CONF.register_opts(amqp_opts) UNIQUE_ID = '_unique_id' LOG = logging.getLogger(__name__)
**** CubicPower OpenStack Study **** class Pool(pools.Pool): """Class that implements a Pool of Connections."""
**** CubicPower OpenStack Study **** def __init__(self, conf, connection_cls, *args, **kwargs): self.connection_cls = connection_cls self.conf = conf kwargs.setdefault("max_size", self.conf.rpc_conn_pool_size) kwargs.setdefault("order_as_stack", True) super(Pool, self).__init__(*args, **kwargs) self.reply_proxy = None # TODO(comstud): Timeout connections not used in a while
**** CubicPower OpenStack Study **** def create(self): LOG.debug('Pool creating new connection') return self.connection_cls(self.conf)
**** CubicPower OpenStack Study **** def empty(self): while self.free_items: self.get().close() # Force a new connection pool to be created. # Note that this was added due to failing unit test cases. The issue # is the above "while loop" gets all the cached connections from the # pool and closes them, but never returns them to the pool, a pool # leak. The unit tests hang waiting for an item to be returned to the # pool. The unit tests get here via the tearDown() method. In the run # time code, it gets here via cleanup() and only appears in service.py # just before doing a sys.exit(), so cleanup() only happens once and # the leakage is not a problem. self.connection_cls.pool = None _pool_create_sem = semaphore.Semaphore() def get_connection_pool(conf, connection_cls): with _pool_create_sem: # Make sure only one thread tries to create the connection pool. if not connection_cls.pool: connection_cls.pool = Pool(conf, connection_cls) return connection_cls.pool
**** CubicPower OpenStack Study **** def get_connection_pool(conf, connection_cls): with _pool_create_sem: # Make sure only one thread tries to create the connection pool. if not connection_cls.pool: connection_cls.pool = Pool(conf, connection_cls) return connection_cls.pool
**** CubicPower OpenStack Study **** class ConnectionContext(rpc_common.Connection): """The class that is actually returned to the create_connection() caller. This is essentially a wrapper around Connection that supports 'with'. It can also return a new Connection, or one from a pool. The function will also catch when an instance of this class is to be deleted. With that we can return Connections to the pool on exceptions and so forth without making the caller be responsible for catching them. If possible the function makes sure to return a connection to the pool. """
**** CubicPower OpenStack Study **** def __init__(self, conf, connection_pool, pooled=True, server_params=None): """Create a new connection, or get one from the pool.""" self.connection = None self.conf = conf self.connection_pool = connection_pool if pooled: self.connection = connection_pool.get() else: self.connection = connection_pool.connection_cls( conf, server_params=server_params) self.pooled = pooled
**** CubicPower OpenStack Study **** def __enter__(self): """When with ConnectionContext() is used, return self.""" return self
**** CubicPower OpenStack Study **** def _done(self): """If the connection came from a pool, clean it up and put it back. If it did not come from a pool, close it. """ if self.connection: if self.pooled: # Reset the connection so it's ready for the next caller # to grab from the pool self.connection.reset() self.connection_pool.put(self.connection) else: try: self.connection.close() except Exception: pass self.connection = None
**** CubicPower OpenStack Study **** def __exit__(self, exc_type, exc_value, tb): """End of 'with' statement. We're done here.""" self._done()
**** CubicPower OpenStack Study **** def __del__(self): """Caller is done with this connection. Make sure we cleaned up.""" self._done()
**** CubicPower OpenStack Study **** def close(self): """Caller is done with this connection.""" self._done()
**** CubicPower OpenStack Study **** def create_consumer(self, topic, proxy, fanout=False): self.connection.create_consumer(topic, proxy, fanout)
**** CubicPower OpenStack Study **** def create_worker(self, topic, proxy, pool_name): self.connection.create_worker(topic, proxy, pool_name)
**** CubicPower OpenStack Study **** def join_consumer_pool(self, callback, pool_name, topic, exchange_name, ack_on_error=True): self.connection.join_consumer_pool(callback, pool_name, topic, exchange_name, ack_on_error)
**** CubicPower OpenStack Study **** def consume_in_thread(self): return self.connection.consume_in_thread()
**** CubicPower OpenStack Study **** def __getattr__(self, key): """Proxy all other calls to the Connection instance.""" if self.connection: return getattr(self.connection, key) else: raise rpc_common.InvalidRPCConnectionReuse()
**** CubicPower OpenStack Study **** class ReplyProxy(ConnectionContext): """Connection class for RPC replies / callbacks."""
**** CubicPower OpenStack Study **** def __init__(self, conf, connection_pool): self._call_waiters = {} self._num_call_waiters = 0 self._num_call_waiters_wrn_threshold = 10 self._reply_q = 'reply_' + uuid.uuid4().hex super(ReplyProxy, self).__init__(conf, connection_pool, pooled=False) self.declare_direct_consumer(self._reply_q, self._process_data) self.consume_in_thread()
**** CubicPower OpenStack Study **** def _process_data(self, message_data): msg_id = message_data.pop('_msg_id', None) waiter = self._call_waiters.get(msg_id) if not waiter: LOG.warn(_('No calling threads waiting for msg_id : %(msg_id)s' ', message : %(data)s'), {'msg_id': msg_id, 'data': message_data}) LOG.warn(_('_call_waiters: %s') % str(self._call_waiters)) else: waiter.put(message_data)
**** CubicPower OpenStack Study **** def add_call_waiter(self, waiter, msg_id): self._num_call_waiters += 1 if self._num_call_waiters > self._num_call_waiters_wrn_threshold: LOG.warn(_('Number of call waiters is greater than warning ' 'threshold: %d. There could be a MulticallProxyWaiter ' 'leak.') % self._num_call_waiters_wrn_threshold) self._num_call_waiters_wrn_threshold *= 2 self._call_waiters[msg_id] = waiter
**** CubicPower OpenStack Study **** def del_call_waiter(self, msg_id): self._num_call_waiters -= 1 del self._call_waiters[msg_id]
**** CubicPower OpenStack Study **** def get_reply_q(self): return self._reply_q def msg_reply(conf, msg_id, reply_q, connection_pool, reply=None, failure=None, ending=False, log_failure=True): """Sends a reply or an error on the channel signified by msg_id. Failure should be a sys.exc_info() tuple. """ with ConnectionContext(conf, connection_pool) as conn: if failure: failure = rpc_common.serialize_remote_exception(failure, log_failure) msg = {'result': reply, 'failure': failure} if ending: msg['ending'] = True _add_unique_id(msg) # If a reply_q exists, add the msg_id to the reply and pass the # reply_q to direct_send() to use it as the response queue. # Otherwise use the msg_id for backward compatibility. if reply_q: msg['_msg_id'] = msg_id conn.direct_send(reply_q, rpc_common.serialize_msg(msg)) else: conn.direct_send(msg_id, rpc_common.serialize_msg(msg))
**** CubicPower OpenStack Study **** def msg_reply(conf, msg_id, reply_q, connection_pool, reply=None, failure=None, ending=False, log_failure=True): """Sends a reply or an error on the channel signified by msg_id. Failure should be a sys.exc_info() tuple. """ with ConnectionContext(conf, connection_pool) as conn: if failure: failure = rpc_common.serialize_remote_exception(failure, log_failure) msg = {'result': reply, 'failure': failure} if ending: msg['ending'] = True _add_unique_id(msg) # If a reply_q exists, add the msg_id to the reply and pass the # reply_q to direct_send() to use it as the response queue. # Otherwise use the msg_id for backward compatibility. if reply_q: msg['_msg_id'] = msg_id conn.direct_send(reply_q, rpc_common.serialize_msg(msg)) else: conn.direct_send(msg_id, rpc_common.serialize_msg(msg))
**** CubicPower OpenStack Study **** class RpcContext(rpc_common.CommonRpcContext): """Context that supports replying to a rpc.call."""
**** CubicPower OpenStack Study **** def __init__(self, **kwargs): self.msg_id = kwargs.pop('msg_id', None) self.reply_q = kwargs.pop('reply_q', None) self.conf = kwargs.pop('conf') super(RpcContext, self).__init__(**kwargs)
**** CubicPower OpenStack Study **** def deepcopy(self): values = self.to_dict() values['conf'] = self.conf values['msg_id'] = self.msg_id values['reply_q'] = self.reply_q return self.__class__(**values)
**** CubicPower OpenStack Study **** def reply(self, reply=None, failure=None, ending=False, connection_pool=None, log_failure=True): if self.msg_id: msg_reply(self.conf, self.msg_id, self.reply_q, connection_pool, reply, failure, ending, log_failure) if ending: self.msg_id = None def unpack_context(conf, msg): """Unpack context from msg.""" context_dict = {} for key in list(msg.keys()): # NOTE(vish): Some versions of python don't like unicode keys # in kwargs. key = str(key) if key.startswith('_context_'): value = msg.pop(key) context_dict[key[9:]] = value context_dict['msg_id'] = msg.pop('_msg_id', None) context_dict['reply_q'] = msg.pop('_reply_q', None) context_dict['conf'] = conf ctx = RpcContext.from_dict(context_dict) rpc_common._safe_log(LOG.debug, 'unpacked context: %s', ctx.to_dict()) return ctx def pack_context(msg, context): """Pack context into msg. Values for message keys need to be less than 255 chars, so we pull context out into a bunch of separate keys. If we want to support more arguments in rabbit messages, we may want to do the same for args at some point. """ if isinstance(context, dict): context_d = dict([('_context_%s' % key, value) for (key, value) in six.iteritems(context)]) else: context_d = dict([('_context_%s' % key, value) for (key, value) in six.iteritems(context.to_dict())]) msg.update(context_d)
**** CubicPower OpenStack Study **** def unpack_context(conf, msg): """Unpack context from msg.""" context_dict = {} for key in list(msg.keys()): # NOTE(vish): Some versions of python don't like unicode keys # in kwargs. key = str(key) if key.startswith('_context_'): value = msg.pop(key) context_dict[key[9:]] = value context_dict['msg_id'] = msg.pop('_msg_id', None) context_dict['reply_q'] = msg.pop('_reply_q', None) context_dict['conf'] = conf ctx = RpcContext.from_dict(context_dict) rpc_common._safe_log(LOG.debug, 'unpacked context: %s', ctx.to_dict()) return ctx
**** CubicPower OpenStack Study **** def pack_context(msg, context): """Pack context into msg. Values for message keys need to be less than 255 chars, so we pull context out into a bunch of separate keys. If we want to support more arguments in rabbit messages, we may want to do the same for args at some point. """ if isinstance(context, dict): context_d = dict([('_context_%s' % key, value) for (key, value) in six.iteritems(context)]) else: context_d = dict([('_context_%s' % key, value) for (key, value) in six.iteritems(context.to_dict())]) msg.update(context_d)
**** CubicPower OpenStack Study **** class _MsgIdCache(object): """This class checks any duplicate messages.""" # NOTE: This value is considered can be a configuration item, but # it is not necessary to change its value in most cases, # so let this value as static for now. DUP_MSG_CHECK_SIZE = 16
**** CubicPower OpenStack Study **** def __init__(self, **kwargs): self.prev_msgids = collections.deque([], maxlen=self.DUP_MSG_CHECK_SIZE)
**** CubicPower OpenStack Study **** def check_duplicate_message(self, message_data): """AMQP consumers may read same message twice when exceptions occur before ack is returned. This method prevents doing it. """ if UNIQUE_ID in message_data: msg_id = message_data[UNIQUE_ID] if msg_id not in self.prev_msgids: self.prev_msgids.append(msg_id) else: raise rpc_common.DuplicateMessageError(msg_id=msg_id) def _add_unique_id(msg): """Add unique_id for checking duplicate messages.""" unique_id = uuid.uuid4().hex msg.update({UNIQUE_ID: unique_id}) LOG.debug('UNIQUE_ID is %s.' % (unique_id))
**** CubicPower OpenStack Study **** def _add_unique_id(msg): """Add unique_id for checking duplicate messages.""" unique_id = uuid.uuid4().hex msg.update({UNIQUE_ID: unique_id}) LOG.debug('UNIQUE_ID is %s.' % (unique_id))
**** CubicPower OpenStack Study **** class _ThreadPoolWithWait(object): """Base class for a delayed invocation manager. Used by the Connection class to start up green threads to handle incoming messages. """
**** CubicPower OpenStack Study **** def __init__(self, conf, connection_pool): self.pool = greenpool.GreenPool(conf.rpc_thread_pool_size) self.connection_pool = connection_pool self.conf = conf
**** CubicPower OpenStack Study **** def wait(self): """Wait for all callback threads to exit.""" self.pool.waitall()
**** CubicPower OpenStack Study **** class CallbackWrapper(_ThreadPoolWithWait): """Wraps a straight callback. Allows it to be invoked in a green thread. """
**** CubicPower OpenStack Study **** def __init__(self, conf, callback, connection_pool, wait_for_consumers=False): """Initiates CallbackWrapper object. :param conf: cfg.CONF instance :param callback: a callable (probably a function) :param connection_pool: connection pool as returned by get_connection_pool() :param wait_for_consumers: wait for all green threads to complete and raise the last caught exception, if any. """ super(CallbackWrapper, self).__init__( conf=conf, connection_pool=connection_pool, ) self.callback = callback self.wait_for_consumers = wait_for_consumers self.exc_info = None
**** CubicPower OpenStack Study **** def _wrap(self, message_data, **kwargs): """Wrap the callback invocation to catch exceptions. """ try: self.callback(message_data, **kwargs) except Exception: self.exc_info = sys.exc_info()
**** CubicPower OpenStack Study **** def __call__(self, message_data): self.exc_info = None self.pool.spawn_n(self._wrap, message_data) if self.wait_for_consumers: self.pool.waitall() if self.exc_info: six.reraise(self.exc_info[1], None, self.exc_info[2])
**** CubicPower OpenStack Study **** class ProxyCallback(_ThreadPoolWithWait): """Calls methods on a proxy object based on method and args."""
**** CubicPower OpenStack Study **** def __init__(self, conf, proxy, connection_pool): super(ProxyCallback, self).__init__( conf=conf, connection_pool=connection_pool, ) self.proxy = proxy self.msg_id_cache = _MsgIdCache()
**** CubicPower OpenStack Study **** def __call__(self, message_data): """Consumer callback to call a method on a proxy object. Parses the message for validity and fires off a thread to call the proxy object method. Message data should be a dictionary with two keys: method: string representing the method to call args: dictionary of arg: value Example: {'method': 'echo', 'args': {'value': 42}} """ # It is important to clear the context here, because at this point # the previous context is stored in local.store.context if hasattr(local.store, 'context'): del local.store.context rpc_common._safe_log(LOG.debug, 'received %s', message_data) self.msg_id_cache.check_duplicate_message(message_data) ctxt = unpack_context(self.conf, message_data) method = message_data.get('method') args = message_data.get('args', {}) version = message_data.get('version') namespace = message_data.get('namespace') if not method: LOG.warn(_('no method for message: %s') % message_data) ctxt.reply(_('No method for message: %s') % message_data, connection_pool=self.connection_pool) return self.pool.spawn_n(self._process_data, ctxt, version, method, namespace, args)
**** CubicPower OpenStack Study **** def _process_data(self, ctxt, version, method, namespace, args): """Process a message in a new thread. If the proxy object we have has a dispatch method (see rpc.dispatcher.RpcDispatcher), pass it the version, method, and args and let it dispatch as appropriate. If not, use the old behavior of magically calling the specified method on the proxy we have here. """ ctxt.update_store() try: rval = self.proxy.dispatch(ctxt, version, method, namespace, **args) # Check if the result was a generator if inspect.isgenerator(rval): for x in rval: ctxt.reply(x, None, connection_pool=self.connection_pool) else: ctxt.reply(rval, None, connection_pool=self.connection_pool) # This final None tells multicall that it is done. ctxt.reply(ending=True, connection_pool=self.connection_pool) except rpc_common.ClientException as e: LOG.debug('Expected exception during message handling (%s)' % e._exc_info[1]) ctxt.reply(None, e._exc_info, connection_pool=self.connection_pool, log_failure=False) except Exception: # sys.exc_info() is deleted by LOG.exception(). exc_info = sys.exc_info() LOG.error(_LE('Exception during message handling'), exc_info=exc_info) ctxt.reply(None, exc_info, connection_pool=self.connection_pool)
**** CubicPower OpenStack Study **** class MulticallProxyWaiter(object):
**** CubicPower OpenStack Study **** def __init__(self, conf, msg_id, timeout, connection_pool): self._msg_id = msg_id self._timeout = timeout or conf.rpc_response_timeout self._reply_proxy = connection_pool.reply_proxy self._done = False self._got_ending = False self._conf = conf self._dataqueue = queue.LightQueue() # Add this caller to the reply proxy's call_waiters self._reply_proxy.add_call_waiter(self, self._msg_id) self.msg_id_cache = _MsgIdCache()
**** CubicPower OpenStack Study **** def put(self, data): self._dataqueue.put(data)
**** CubicPower OpenStack Study **** def done(self): if self._done: return self._done = True # Remove this caller from reply proxy's call_waiters self._reply_proxy.del_call_waiter(self._msg_id)
**** CubicPower OpenStack Study **** def _process_data(self, data): result = None self.msg_id_cache.check_duplicate_message(data) if data['failure']: failure = data['failure'] result = rpc_common.deserialize_remote_exception(self._conf, failure) elif data.get('ending', False): self._got_ending = True else: result = data['result'] return result
**** CubicPower OpenStack Study **** def __iter__(self): """Return a result until we get a reply with an 'ending' flag.""" if self._done: raise StopIteration while True: try: data = self._dataqueue.get(timeout=self._timeout) result = self._process_data(data) except queue.Empty: self.done() raise rpc_common.Timeout() except Exception: with excutils.save_and_reraise_exception(): self.done() if self._got_ending: self.done() raise StopIteration 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.""" 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) 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) conn.notify_send(topic, msg) def cleanup(connection_pool): if connection_pool: connection_pool.empty() def get_control_exchange(conf): return conf.control_exchange
**** CubicPower OpenStack Study **** def create_connection(conf, new, connection_pool): """Create a connection.""" return ConnectionContext(conf, connection_pool, pooled=not new) _reply_proxy_create_sem = semaphore.Semaphore()
**** CubicPower OpenStack Study **** def multicall(conf, context, topic, msg, timeout, connection_pool): """Make a call that returns multiple times.""" 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) 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
**** CubicPower OpenStack Study **** 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]
**** CubicPower OpenStack Study **** 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))
**** CubicPower OpenStack Study **** 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))
**** CubicPower OpenStack Study **** 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))
**** CubicPower OpenStack Study **** 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))
**** CubicPower OpenStack Study **** 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) conn.notify_send(topic, msg)
**** CubicPower OpenStack Study **** def cleanup(connection_pool): if connection_pool: connection_pool.empty()
**** CubicPower OpenStack Study **** def get_control_exchange(conf): return conf.control_exchange
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