14431bc076
Add a new logging BLATHER level to easily allow its usage for messages that are below the normal DEBUG level such as compilation information and scope lookup info which can be very verbose in logs if always enabled. Change-Id: I828211403bd02bfd6777b10cdcfe58fb0637a52c
127 lines
5.3 KiB
Python
127 lines
5.3 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2012-2013 Yahoo! Inc. All Rights Reserved.
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#
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# 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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from taskflow import logging
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from taskflow import states
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from taskflow import task as task_atom
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from taskflow.types import failure
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LOG = logging.getLogger(__name__)
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SAVE_RESULT_STATES = (states.SUCCESS, states.FAILURE)
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class TaskAction(object):
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"""An action that handles scheduling, state changes, ... of task atoms."""
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def __init__(self, storage, task_executor, notifier, walker_factory):
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self._storage = storage
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self._task_executor = task_executor
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self._notifier = notifier
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self._walker_factory = walker_factory
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@staticmethod
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def handles(atom):
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return isinstance(atom, task_atom.BaseTask)
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def _is_identity_transition(self, state, task, progress):
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if state in SAVE_RESULT_STATES:
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# saving result is never identity transition
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return False
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old_state = self._storage.get_atom_state(task.name)
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if state != old_state:
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# changing state is not identity transition by definition
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return False
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# NOTE(imelnikov): last thing to check is that the progress has
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# changed, which means progress is not None and is different from
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# what is stored in the database.
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if progress is None:
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return False
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old_progress = self._storage.get_task_progress(task.name)
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if old_progress != progress:
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return False
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return True
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def change_state(self, task, state, result=None, progress=None):
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if self._is_identity_transition(state, task, progress):
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# NOTE(imelnikov): ignore identity transitions in order
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# to avoid extra write to storage backend and, what's
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# more important, extra notifications
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return
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if state in SAVE_RESULT_STATES:
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self._storage.save(task.name, result, state)
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else:
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self._storage.set_atom_state(task.name, state)
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if progress is not None:
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self._storage.set_task_progress(task.name, progress)
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task_uuid = self._storage.get_atom_uuid(task.name)
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details = dict(task_name=task.name,
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task_uuid=task_uuid,
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result=result)
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self._notifier.notify(state, details)
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if progress is not None:
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task.update_progress(progress)
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def _on_update_progress(self, task, event_data, progress, **kwargs):
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"""Should be called when task updates its progress."""
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try:
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self._storage.set_task_progress(task.name, progress, kwargs)
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except Exception:
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# Update progress callbacks should never fail, so capture and log
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# the emitted exception instead of raising it.
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LOG.exception("Failed setting task progress for %s to %0.3f",
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task, progress)
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def schedule_execution(self, task):
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self.change_state(task, states.RUNNING, progress=0.0)
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scope_walker = self._walker_factory(task)
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kwargs = self._storage.fetch_mapped_args(task.rebind,
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atom_name=task.name,
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scope_walker=scope_walker)
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task_uuid = self._storage.get_atom_uuid(task.name)
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return self._task_executor.execute_task(task, task_uuid, kwargs,
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self._on_update_progress)
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def complete_execution(self, task, result):
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if isinstance(result, failure.Failure):
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self.change_state(task, states.FAILURE, result=result)
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else:
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self.change_state(task, states.SUCCESS,
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result=result, progress=1.0)
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def schedule_reversion(self, task):
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self.change_state(task, states.REVERTING, progress=0.0)
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scope_walker = self._walker_factory(task)
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kwargs = self._storage.fetch_mapped_args(task.rebind,
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atom_name=task.name,
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scope_walker=scope_walker)
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task_uuid = self._storage.get_atom_uuid(task.name)
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task_result = self._storage.get(task.name)
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failures = self._storage.get_failures()
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future = self._task_executor.revert_task(task, task_uuid, kwargs,
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task_result, failures,
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self._on_update_progress)
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return future
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def complete_reversion(self, task, rev_result):
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if isinstance(rev_result, failure.Failure):
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self.change_state(task, states.FAILURE)
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else:
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self.change_state(task, states.REVERTED, progress=1.0)
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def wait_for_any(self, fs, timeout):
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return self._task_executor.wait_for_any(fs, timeout)
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