deb-heat/heat/common/messaging.py
Angus Salkeld a98d2c9c5d Add OSprofiler integration into Heat
This adds builtin rpc and db traces to Heat, as well as
some toplevel stack methods to aid in reading the output.

A 'profiler' config group is added to enable profiling.

Change-Id: Ie5c1c8f1931f59e4d4bcf1ec3b791f55984eb6d2
Closes-bug: #1363782
2014-10-03 15:40:25 +10:00

132 lines
4.2 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2013 eNovance <licensing@enovance.com>
#
# Author: Mehdi Abaakouk <mehdi.abaakouk@enovance.com>
#
# 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
from oslo.serialization import jsonutils
from osprofiler import profiler
from heat.common import context
TRANSPORT = None
NOTIFIER = None
_ALIASES = {
'heat.openstack.common.rpc.impl_kombu': 'rabbit',
'heat.openstack.common.rpc.impl_qpid': 'qpid',
'heat.openstack.common.rpc.impl_zmq': 'zmq',
}
class RequestContextSerializer(oslo.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)
class JsonPayloadSerializer(oslo.messaging.NoOpSerializer):
@classmethod
def serialize_entity(cls, context, entity):
return jsonutils.to_primitive(entity, convert_instances=True)
def setup(url=None, optional=False):
"""Initialise the oslo.messaging layer."""
global TRANSPORT, NOTIFIER
if url and url.startswith("fake://"):
# NOTE(sileht): oslo.messaging fake driver uses time.sleep
# for task switch, so we need to monkey_patch it
eventlet.monkey_patch(time=True)
if not TRANSPORT:
oslo.messaging.set_transport_defaults('heat')
exmods = ['heat.common.exception']
try:
TRANSPORT = oslo.messaging.get_transport(
cfg.CONF, url, allowed_remote_exmods=exmods, aliases=_ALIASES)
except oslo.messaging.InvalidTransportURL as e:
TRANSPORT = None
if not optional or e.url:
# NOTE(sileht): oslo.messaging is configured but unloadable
# so reraise the exception
raise
if not NOTIFIER and TRANSPORT:
serializer = RequestContextSerializer(JsonPayloadSerializer())
NOTIFIER = oslo.messaging.Notifier(TRANSPORT, serializer=serializer)
def cleanup():
"""Cleanup the oslo.messaging layer."""
global TRANSPORT, NOTIFIER
if TRANSPORT:
TRANSPORT.cleanup()
TRANSPORT = NOTIFIER = None
def get_rpc_server(target, endpoint):
"""Return a configured oslo.messaging rpc server."""
serializer = RequestContextSerializer(JsonPayloadSerializer())
return oslo.messaging.get_rpc_server(TRANSPORT, target, [endpoint],
executor='eventlet',
serializer=serializer)
def get_rpc_client(**kwargs):
"""Return a configured oslo.messaging RPCClient."""
target = oslo.messaging.Target(**kwargs)
serializer = RequestContextSerializer(JsonPayloadSerializer())
return oslo.messaging.RPCClient(TRANSPORT, target,
serializer=serializer)
def get_notifier(publisher_id):
"""Return a configured oslo.messaging notifier."""
return NOTIFIER.prepare(publisher_id=publisher_id)