Clustering service for managing homogeneous objects in OpenStack
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import eventlet
from oslo_config import cfg
import oslo_messaging as messaging
from osprofiler import profiler
from senlin.common import consts
from senlin.common import context
# An alias for the default serializer
JsonPayloadSerializer = messaging.JsonPayloadSerializer
TRANSPORT = None
NOTIFICATION_TRANSPORT = None
NOTIFIER = None
class RequestContextSerializer(messaging.Serializer):
def __init__(self, base):
self._base = base
def serialize_entity(self, ctxt, entity):
if not self._base:
return entity
return self._base.serialize_entity(ctxt, entity)
def deserialize_entity(self, ctxt, entity):
if not self._base:
return entity
return self._base.deserialize_entity(ctxt, entity)
@staticmethod
def serialize_context(ctxt):
_context = ctxt.to_dict()
prof = profiler.get()
if prof:
trace_info = {
"hmac_key": prof.hmac_key,
"base_id": prof.get_base_id(),
"parent_id": prof.get_id()
}
_context.update({"trace_info": trace_info})
return _context
@staticmethod
def deserialize_context(ctxt):
trace_info = ctxt.pop("trace_info", None)
if trace_info:
profiler.init(**trace_info)
return context.RequestContext.from_dict(ctxt)
def setup(url=None, optional=False):
"""Initialise the oslo_messaging layer."""
global TRANSPORT, GLOBAL_TRANSPORT, NOTIFIER
if url and url.startswith("fake://"):
# NOTE: oslo_messaging fake driver uses time.sleep
# for task switch, so we need to monkey_patch it
eventlet.monkey_patch(time=True)
messaging.set_transport_defaults('senlin')
if not TRANSPORT:
exmods = ['senlin.common.exception']
try:
TRANSPORT = messaging.get_rpc_transport(
cfg.CONF, url, allowed_remote_exmods=exmods)
except messaging.InvalidTransportURL as e:
TRANSPORT = None
if not optional or e.url:
# NOTE: oslo_messaging is configured but unloadable
# so reraise the exception
raise
if not NOTIFIER:
exmods = ['senlin.common.exception']
try:
NOTIFICATION_TRANSPORT = messaging.get_notification_transport(
cfg.CONF, allowed_remote_exmods=exmods)
except Exception:
raise
serializer = RequestContextSerializer(JsonPayloadSerializer())
NOTIFIER = messaging.Notifier(NOTIFICATION_TRANSPORT,
serializer=serializer,
topics=cfg.CONF.notification_topics)
def cleanup():
"""Cleanup the oslo_messaging layer."""
global TRANSPORT, NOTIFICATION_TRANSPORT, NOTIFIER
if TRANSPORT:
TRANSPORT.cleanup()
TRANSPORT = None
NOTIFIER = None
if NOTIFICATION_TRANSPORT:
NOTIFICATION_TRANSPORT.cleanup()
NOTIFICATION_TRANSPORT = None
def get_rpc_server(target, endpoint, serializer=None):
"""Return a configured oslo_messaging rpc server."""
if serializer is None:
serializer = JsonPayloadSerializer()
serializer = RequestContextSerializer(serializer)
return messaging.get_rpc_server(TRANSPORT, target, [endpoint],
executor='eventlet',
serializer=serializer)
def get_rpc_client(topic, server, serializer=None):
"""Return a configured oslo_messaging RPCClient."""
target = messaging.Target(topic=topic, server=server,
version=consts.RPC_API_VERSION_BASE)
if serializer is None:
serializer = JsonPayloadSerializer()
serializer = RequestContextSerializer(serializer)
return messaging.RPCClient(TRANSPORT, target, serializer=serializer)
def get_notifier(publisher_id):
"""Return a configured oslo_messaging notifier."""
global NOTIFIER
return NOTIFIER.prepare(publisher_id=publisher_id)