a3fe3eb698
When a atom is reverted it can be useful to retain the result of that 'revert' method being called, so that it can be later analyzed (or used for various purposes) so adjust the storage, and actions to enable it to be stored. Change-Id: I38a9a5f3bf7550e924468bb4a86652cb8beb306c
130 lines
4.7 KiB
Python
130 lines
4.7 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
# Copyright (C) 2012-2013 Yahoo! Inc. All Rights Reserved.
|
|
#
|
|
# 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.
|
|
|
|
from taskflow.engines.action_engine.actions import base
|
|
from taskflow.engines.action_engine import executor as ex
|
|
from taskflow import logging
|
|
from taskflow import retry as retry_atom
|
|
from taskflow import states
|
|
from taskflow.types import failure
|
|
from taskflow.types import futures
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
def _execute_retry(retry, arguments):
|
|
try:
|
|
result = retry.execute(**arguments)
|
|
except Exception:
|
|
result = failure.Failure()
|
|
return (ex.EXECUTED, result)
|
|
|
|
|
|
def _revert_retry(retry, arguments):
|
|
try:
|
|
result = retry.revert(**arguments)
|
|
except Exception:
|
|
result = failure.Failure()
|
|
return (ex.REVERTED, result)
|
|
|
|
|
|
class RetryAction(base.Action):
|
|
"""An action that handles executing, state changes, ... of retry atoms."""
|
|
|
|
def __init__(self, storage, notifier):
|
|
super(RetryAction, self).__init__(storage, notifier)
|
|
self._executor = futures.SynchronousExecutor()
|
|
|
|
def _get_retry_args(self, retry, addons=None):
|
|
arguments = self._storage.fetch_mapped_args(
|
|
retry.rebind,
|
|
atom_name=retry.name,
|
|
optional_args=retry.optional
|
|
)
|
|
history = self._storage.get_retry_history(retry.name)
|
|
arguments[retry_atom.EXECUTE_REVERT_HISTORY] = history
|
|
if addons:
|
|
arguments.update(addons)
|
|
return arguments
|
|
|
|
def change_state(self, retry, state, result=base.Action.NO_RESULT):
|
|
old_state = self._storage.get_atom_state(retry.name)
|
|
if state in self.SAVE_RESULT_STATES:
|
|
save_result = None
|
|
if result is not self.NO_RESULT:
|
|
save_result = result
|
|
self._storage.save(retry.name, save_result, state)
|
|
# TODO(harlowja): combine this with the save to avoid a call
|
|
# back into the persistence layer...
|
|
if state == states.REVERTED:
|
|
self._storage.cleanup_retry_history(retry.name, state)
|
|
else:
|
|
if state == old_state:
|
|
# NOTE(imelnikov): nothing really changed, so we should not
|
|
# write anything to storage and run notifications.
|
|
return
|
|
self._storage.set_atom_state(retry.name, state)
|
|
retry_uuid = self._storage.get_atom_uuid(retry.name)
|
|
details = {
|
|
'retry_name': retry.name,
|
|
'retry_uuid': retry_uuid,
|
|
'old_state': old_state,
|
|
}
|
|
if result is not self.NO_RESULT:
|
|
details['result'] = result
|
|
self._notifier.notify(state, details)
|
|
|
|
def execute(self, retry):
|
|
|
|
def _on_done_callback(fut):
|
|
result = fut.result()[-1]
|
|
if isinstance(result, failure.Failure):
|
|
self.change_state(retry, states.FAILURE, result=result)
|
|
else:
|
|
self.change_state(retry, states.SUCCESS, result=result)
|
|
|
|
self.change_state(retry, states.RUNNING)
|
|
fut = self._executor.submit(_execute_retry, retry,
|
|
self._get_retry_args(retry))
|
|
fut.add_done_callback(_on_done_callback)
|
|
fut.atom = retry
|
|
return fut
|
|
|
|
def revert(self, retry):
|
|
|
|
def _on_done_callback(fut):
|
|
result = fut.result()[-1]
|
|
if isinstance(result, failure.Failure):
|
|
self.change_state(retry, states.REVERT_FAILURE, result=result)
|
|
else:
|
|
self.change_state(retry, states.REVERTED, result=result)
|
|
|
|
self.change_state(retry, states.REVERTING)
|
|
arg_addons = {
|
|
retry_atom.REVERT_FLOW_FAILURES: self._storage.get_failures(),
|
|
}
|
|
fut = self._executor.submit(_revert_retry, retry,
|
|
self._get_retry_args(retry,
|
|
addons=arg_addons))
|
|
fut.add_done_callback(_on_done_callback)
|
|
fut.atom = retry
|
|
return fut
|
|
|
|
def on_failure(self, retry, atom, last_failure):
|
|
self._storage.save_retry_failure(retry.name, atom.name, last_failure)
|
|
arguments = self._get_retry_args(retry)
|
|
return retry.on_failure(**arguments)
|