Eos/eos/core/tasks/__init__.py

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# Eos - Verifiable elections
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# Copyright © 2017-2019 RunasSudo (Yingtong Li)
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#
# 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 *
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class TaskStatus(EosEnum):
UNKNOWN = 0
READY = 20
PROCESSING = 30
COMPLETE = 50
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FAILED = -10
TIMEOUT = -20
def is_error(self):
return self.value < 0
class Task(TopLevelObject):
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label = 'Unknown task'
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_ver = StringField(default='0.8')
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_id = UUIDField()
run_strategy = EmbeddedObjectField()
run_at = DateTimeField()
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timeout = IntField(default=3600) # seconds
started_at = DateTimeField()
completed_at = DateTimeField()
status = EnumField(TaskStatus, default=TaskStatus.UNKNOWN)
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messages = ListField(StringField())
def run(self):
self.run_strategy.run(self)
def _run(self):
pass
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def complete(self):
pass
def error(self):
pass
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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:
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if task.status == TaskStatus.READY:
pending_tasks.append(task)
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# Sort them to ensure we iterate over them in the correct order
pending_tasks.sort(key=lambda task: task.run_at.timestamp() if task.run_at else 0)
return pending_tasks
@staticmethod
def active_tasks():
active_tasks = []
tasks = Task.get_all()
for task in tasks:
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if task.status == TaskStatus.PROCESSING:
active_tasks.append(task)
return active_tasks
@staticmethod
def completed_tasks(limit=None):
completed_tasks = []
tasks = Task.get_all()
for task in tasks:
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if task.status == TaskStatus.COMPLETE or task.status.is_error():
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():
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now = DateTimeField.now()
for task in TaskScheduler.pending_tasks():
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if task.run_at and task.run_at < now:
task.run()
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for task in TaskScheduler.active_tasks():
if task.timeout and (now - task.started_at).total_seconds() > task.timeout:
task.status = TaskStatus.TIMEOUT
task.completed_at = DateTimeField.now()
task.messages.append('Elapsed time exceeded timeout')
task.save()
task.error()