mirror of
https://github.com/ansible/awx.git
synced 2026-01-13 19:10:07 -03:30
147 lines
4.5 KiB
Python
147 lines
4.5 KiB
Python
# Copyright (c) 2018 Ansible by Red Hat
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# All Rights Reserved.
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import os
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import logging
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import signal
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from uuid import UUID
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from Queue import Empty as QueueEmpty
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from kombu import Producer
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from kombu.mixins import ConsumerMixin
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from awx.main.dispatch.pool import WorkerPool
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logger = logging.getLogger('awx.main.dispatch')
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def signame(sig):
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return dict(
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(k, v) for v, k in signal.__dict__.items()
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if v.startswith('SIG') and not v.startswith('SIG_')
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)[sig]
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class WorkerSignalHandler:
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def __init__(self):
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self.kill_now = False
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signal.signal(signal.SIGINT, self.exit_gracefully)
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def exit_gracefully(self, *args, **kwargs):
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self.kill_now = True
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class AWXConsumer(ConsumerMixin):
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def __init__(self, name, connection, worker, queues=[], pool=None):
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self.connection = connection
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self.total_messages = 0
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self.queues = queues
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self.worker = worker
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self.pool = pool
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if pool is None:
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self.pool = WorkerPool()
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self.pool.init_workers(self.worker.work_loop)
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def get_consumers(self, Consumer, channel):
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logger.debug(self.listening_on)
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return [Consumer(queues=self.queues, accept=['json'],
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callbacks=[self.process_task])]
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@property
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def listening_on(self):
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return 'listening on {}'.format([
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'{} [{}]'.format(q.name, q.exchange.type) for q in self.queues
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])
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def control(self, body, message):
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logger.warn(body)
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control = body.get('control')
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if control in ('status', 'running'):
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producer = Producer(
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channel=self.connection,
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routing_key=message.properties['reply_to']
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)
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if control == 'status':
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msg = '\n'.join([self.listening_on, self.pool.debug()])
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elif control == 'running':
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msg = []
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for worker in self.pool.workers:
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worker.calculate_managed_tasks()
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msg.extend(worker.managed_tasks.keys())
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producer.publish(msg)
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elif control == 'reload':
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for worker in self.pool.workers:
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worker.quit()
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else:
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logger.error('unrecognized control message: {}'.format(control))
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message.ack()
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def process_task(self, body, message):
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if 'control' in body:
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return self.control(body, message)
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if len(self.pool):
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if "uuid" in body and body['uuid']:
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try:
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queue = UUID(body['uuid']).int % len(self.pool)
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except Exception:
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queue = self.total_messages % len(self.pool)
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else:
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queue = self.total_messages % len(self.pool)
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else:
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queue = 0
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self.pool.write(queue, body)
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self.total_messages += 1
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message.ack()
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def run(self, *args, **kwargs):
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signal.signal(signal.SIGINT, self.stop)
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signal.signal(signal.SIGTERM, self.stop)
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self.worker.on_start()
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super(AWXConsumer, self).run(*args, **kwargs)
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def stop(self, signum, frame):
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self.should_stop = True # this makes the kombu mixin stop consuming
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logger.debug('received {}, stopping'.format(signame(signum)))
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self.worker.on_stop()
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raise SystemExit()
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class BaseWorker(object):
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def work_loop(self, queue, finished, idx, *args):
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ppid = os.getppid()
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signal_handler = WorkerSignalHandler()
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while not signal_handler.kill_now:
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# if the parent PID changes, this process has been orphaned
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# via e.g., segfault or sigkill, we should exit too
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if os.getppid() != ppid:
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break
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try:
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body = queue.get(block=True, timeout=1)
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if body == 'QUIT':
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break
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except QueueEmpty:
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continue
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except Exception as e:
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logger.error("Exception on worker {}, restarting: ".format(idx) + str(e))
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continue
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try:
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self.perform_work(body, *args)
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finally:
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if 'uuid' in body:
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uuid = body['uuid']
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logger.debug('task {} is finished'.format(uuid))
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finished.put(uuid)
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logger.warn('worker exiting gracefully pid:{}'.format(os.getpid()))
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def perform_work(self, body):
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raise NotImplementedError()
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def on_start(self):
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pass
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def on_stop(self):
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pass
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