83d5b25ed0
This commit resolves a TODO item (bulk metadata create), rephrases some comments and makes use of new TaskFlow functionality to save results of revert command to make decisions in c-vol manager instead of doing an ugly workaround by injecting the information into exception raised. Partial-Implements: blueprint taskflow-refactoring Depends-On: I82ebd0102aa5f50d98d9d6b48b13cd659d6dbcec Change-Id: Ia4739c87ca83ae725e16256e3f2c596c5e6d935b
81 lines
2.9 KiB
Python
81 lines
2.9 KiB
Python
# 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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import os
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from oslo_log import log as logging
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# For more information please visit: https://wiki.openstack.org/wiki/TaskFlow
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from taskflow.listeners import base
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from taskflow.listeners import logging as logging_listener
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from taskflow import task
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from cinder import exception
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LOG = logging.getLogger(__name__)
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def _make_task_name(cls, addons=None):
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"""Makes a pretty name for a task class."""
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base_name = ".".join([cls.__module__, cls.__name__])
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extra = ''
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if addons:
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extra = ';%s' % (", ".join([str(a) for a in addons]))
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return base_name + extra
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class CinderTask(task.Task):
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"""The root task class for all cinder tasks.
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It automatically names the given task using the module and class that
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implement the given task as the task name.
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"""
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def __init__(self, addons=None, **kwargs):
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super(CinderTask, self).__init__(self.make_name(addons), **kwargs)
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@classmethod
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def make_name(cls, addons=None):
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return _make_task_name(cls, addons)
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class DynamicLogListener(logging_listener.DynamicLoggingListener):
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"""This is used to attach to taskflow engines while they are running.
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It provides a bunch of useful features that expose the actions happening
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inside a taskflow engine, which can be useful for developers for debugging,
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for operations folks for monitoring and tracking of the resource actions
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and more...
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"""
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#: Exception is an excepted case, don't include traceback in log if fails.
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_NO_TRACE_EXCEPTIONS = (exception.InvalidInput, exception.QuotaError)
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def __init__(self, engine,
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task_listen_for=base.DEFAULT_LISTEN_FOR,
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flow_listen_for=base.DEFAULT_LISTEN_FOR,
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retry_listen_for=base.DEFAULT_LISTEN_FOR,
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logger=LOG):
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super(DynamicLogListener, self).__init__(
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engine,
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task_listen_for=task_listen_for,
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flow_listen_for=flow_listen_for,
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retry_listen_for=retry_listen_for,
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log=logger)
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def _format_failure(self, fail):
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if fail.check(*self._NO_TRACE_EXCEPTIONS) is not None:
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exc_info = None
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exc_details = '%s%s' % (os.linesep, fail.pformat(traceback=False))
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return (exc_info, exc_details)
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else:
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return super(DynamicLogListener, self)._format_failure(fail)
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