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125 lines
3.8 KiB
Python
125 lines
3.8 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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import sys
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import redis
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import time
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from queue import Empty as QueueEmpty
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from django import db
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from django.conf import settings
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import redis.exceptions
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from awx.main.utils.redis import get_redis_client
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from awx.main.dispatch.pool import WorkerPool
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from awx.main.utils.db import set_connection_name
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if 'run_callback_receiver' in sys.argv:
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logger = logging.getLogger('awx.main.commands.run_callback_receiver')
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else:
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logger = logging.getLogger('awx.main.dispatch')
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def signame(sig):
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return dict((k, v) for v, k in signal.__dict__.items() if v.startswith('SIG') and not v.startswith('SIG_'))[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.SIGTERM, signal.SIG_DFL)
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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 AWXConsumerBase(object):
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last_stats = time.time()
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def __init__(self, name, worker, queues=[], pool=None):
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self.should_stop = False
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self.name = name
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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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self.redis = get_redis_client()
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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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# Child should implement other things here
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def stop(self, signum, frame):
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self.should_stop = True
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logger.warning('received {}, stopping'.format(signame(signum)))
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self.worker.on_stop()
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raise SystemExit()
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class AWXConsumerRedis(AWXConsumerBase):
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def run(self, *args, **kwargs):
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super(AWXConsumerRedis, self).run(*args, **kwargs)
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self.worker.on_start()
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logger.info(f'Callback receiver started with pid={os.getpid()}')
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db.connection.close() # logs use database, so close connection
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while True:
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time.sleep(60)
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class BaseWorker(object):
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def read(self, queue):
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return queue.get(block=True, timeout=1)
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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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set_connection_name('worker') # set application_name to distinguish from other dispatcher processes
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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 = self.read(queue)
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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:
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logger.exception("Exception on worker {}, reconnecting: ".format(idx))
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continue
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try:
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for conn in db.connections.all():
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# If the database connection has a hiccup during the prior message, close it
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# so we can establish a new connection
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conn.close_if_unusable_or_obsolete()
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self.perform_work(body, *args)
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except Exception:
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logger.exception(f'Unhandled exception in perform_work in worker pid={os.getpid()}')
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finally:
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if 'uuid' in body:
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uuid = body['uuid']
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finished.put(uuid)
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logger.debug('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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