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# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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.
"""
Celery task executor.
"""
import threading
import Queue
from aria.orchestrator.workflows.executor import BaseExecutor
class CeleryExecutor(BaseExecutor):
"""
Celery task executor.
"""
def __init__(self, app, *args, **kwargs):
super(CeleryExecutor, self).__init__(*args, **kwargs)
self._app = app
self._started_signaled = False
self._started_queue = Queue.Queue(maxsize=1)
self._tasks = {}
self._results = {}
self._receiver = None
self._stopped = False
self._receiver_thread = threading.Thread(target=self._events_receiver)
self._receiver_thread.daemon = True
self._receiver_thread.start()
self._started_queue.get(timeout=30)
def _execute(self, ctx):
self._tasks[ctx.id] = ctx
arguments = dict(arg.unwrapped for arg in ctx.task.arguments.itervalues())
arguments['ctx'] = ctx.context
self._results[ctx.id] = self._app.send_task(
ctx.operation_mapping,
kwargs=arguments,
task_id=ctx.task.id,
queue=self._get_queue(ctx))
def close(self):
self._stopped = True
if self._receiver:
self._receiver.should_stop = True
self._receiver_thread.join()
@staticmethod
def _get_queue(task):
return None if task else None # TODO
def _events_receiver(self):
with self._app.connection() as connection:
self._receiver = self._app.events.Receiver(connection, handlers={
'task-started': self._celery_task_started,
'task-succeeded': self._celery_task_succeeded,
'task-failed': self._celery_task_failed,
})
for _ in self._receiver.itercapture(limit=None, timeout=None, wakeup=True):
if not self._started_signaled:
self._started_queue.put(True)
self._started_signaled = True
if self._stopped:
return
def _celery_task_started(self, event):
self._task_started(self._tasks[event['uuid']])
def _celery_task_succeeded(self, event):
task, _ = self._remove_task(event['uuid'])
self._task_succeeded(task)
def _celery_task_failed(self, event):
task, async_result = self._remove_task(event['uuid'])
try:
exception = async_result.result
except BaseException as e:
exception = RuntimeError(
'Could not de-serialize exception of task {0} --> {1}: {2}'
.format(task.name, type(e).__name__, str(e)))
self._task_failed(task, exception=exception)
def _remove_task(self, task_id):
return self._tasks.pop(task_id), self._results.pop(task_id)
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