OpenStack Block Storage (Cinder)
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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 os
from oslo_log import log as logging
# For more information please visit: https://wiki.openstack.org/wiki/TaskFlow
from taskflow import formatters
from taskflow.listeners import base
from taskflow.listeners import logging as logging_listener
from taskflow import task
from cinder import exception
LOG = logging.getLogger(__name__)
def _make_task_name(cls, addons=None):
"""Makes a pretty name for a task class."""
base_name = ".".join([cls.__module__, cls.__name__])
extra = ''
if addons:
extra = ';%s' % (", ".join([str(a) for a in addons]))
return base_name + extra
class CinderTask(task.Task):
"""The root task class for all cinder tasks.
It automatically names the given task using the module and class that
implement the given task as the task name.
"""
def __init__(self, addons=None, **kwargs):
super(CinderTask, self).__init__(self.make_name(addons), **kwargs)
@classmethod
def make_name(cls, addons=None):
return _make_task_name(cls, addons)
class SpecialFormatter(formatters.FailureFormatter):
#: Exception is an excepted case, don't include traceback in log if fails.
_NO_TRACE_EXCEPTIONS = (exception.InvalidInput, exception.QuotaError)
def __init__(self, engine):
super(SpecialFormatter, self).__init__(engine)
def format(self, fail, atom_matcher):
if fail.check(*self._NO_TRACE_EXCEPTIONS) is not None:
exc_info = None
exc_details = '%s%s' % (os.linesep, fail.pformat(traceback=False))
return (exc_info, exc_details)
else:
return super(SpecialFormatter, self).format(fail, atom_matcher)
class DynamicLogListener(logging_listener.DynamicLoggingListener):
"""This is used to attach to taskflow engines while they are running.
It provides a bunch of useful features that expose the actions happening
inside a taskflow engine, which can be useful for developers for debugging,
for operations folks for monitoring and tracking of the resource actions
and more...
"""
def __init__(self, engine,
task_listen_for=base.DEFAULT_LISTEN_FOR,
flow_listen_for=base.DEFAULT_LISTEN_FOR,
retry_listen_for=base.DEFAULT_LISTEN_FOR,
logger=LOG):
super(DynamicLogListener, self).__init__(
engine,
task_listen_for=task_listen_for,
flow_listen_for=flow_listen_for,
retry_listen_for=retry_listen_for,
log=logger, fail_formatter=SpecialFormatter(engine))