Eos/eos/core/tasks/__init__.py

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2017-12-07 15:32:39 +11:00
# Eos - Verifiable elections
# Copyright © 2017 RunasSudo (Yingtong Li)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from eos.core.objects import *
class Task(TopLevelObject):
class Status:
UNKNOWN = 0
READY = 20
PROCESSING = 30
COMPLETE = 50
FAILED = -10
TIMEOUT = -20
_id = UUIDField()
run_strategy = EmbeddedObjectField()
run_at = DateTimeField()
started_at = DateTimeField()
completed_at = DateTimeField()
status = IntField(default=0)
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messages = ListField(StringField())
def run(self):
self.run_strategy.run(self)
def _run(self):
pass
class DummyTask(Task):
_db_name = Task._db_name
label = 'A dummy task'
def _run(self):
if is_python:
#__pragma__('skip')
import time
#__pragma__('noskip')
time.sleep(15)
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class RunStrategy(DocumentObject):
def run(self, task):
raise Exception('Not implemented')
class TaskScheduler:
@staticmethod
def pending_tasks():
pending_tasks = []
tasks = Task.get_all()
for task in tasks:
if task.status == Task.Status.READY and task.run_at and task.run_at < DateTimeField.now():
pending_tasks.append(task)
return pending_tasks
@staticmethod
def active_tasks():
active_tasks = []
tasks = Task.get_all()
for task in tasks:
if task.status == Task.Status.PROCESSING:
active_tasks.append(task)
return active_tasks
@staticmethod
def completed_tasks(limit=None):
completed_tasks = []
tasks = Task.get_all()
for task in tasks:
if task.status == Task.Status.COMPLETE or task.status < 0:
completed_tasks.append(task)
if limit:
completed_tasks.sort(key=lambda x: x.completed_at)
completed_tasks = completed_tasks[-limit:]
return completed_tasks
@staticmethod
def tick():
for task in TaskScheduler.pending_tasks():
task.run()