def check_workers(actor_id, ttl):
"""Check health of all workers for an actor."""
logger.info("Checking health for actor: {}".format(actor_id))
try:
workers = Worker.get_workers(actor_id)
except Exception as e:
logger.error("Got exception trying to retrieve workers: {}".format(e))
return None
logger.debug("workers: {}".format(workers))
host_id = os.environ.get('SPAWNER_HOST_ID',
Config.get('spawner', 'host_id'))
logger.debug("host_id: {}".format(host_id))
for worker in workers:
# if the worker has only been requested, it will not have a host_id.
if 'host_id' not in worker:
# @todo- we will skip for now, but we need something more robust in case the worker is never claimed.
continue
# ignore workers on different hosts
if not host_id == worker['host_id']:
continue
# first check if worker is responsive; if not, will need to manually kill
logger.info("Checking health for worker: {}".format(worker))
ch = WorkerChannel(worker_id=worker['id'])
worker_id = worker.get('id')
result = None
try:
logger.debug("Issuing status check to channel: {}".format(
worker['ch_name']))
result = ch.put_sync('status', timeout=5)
except channelpy.exceptions.ChannelTimeoutException:
logger.info(
"Worker did not respond, removing container and deleting worker."
)
try:
rm_container(worker['cid'])
except DockerError:
pass
try:
Worker.delete_worker(actor_id, worker_id)
logger.info("worker {} deleted from store".format(worker_id))
except Exception as e:
logger.error(
"Got exception trying to delete worker: {}".format(e))
# if the put_sync timed out and we removed the worker, we also need to delete the channel
# otherwise the un-acked message will remain.
try:
ch.delete()
except Exception as e:
logger.error(
"Got exception: {} while trying to delete worker channel for worker: {}"
.format(e, worker_id))
finally:
try:
ch.close()
except Exception as e:
logger.error(
"Got an error trying to close the worker channel for dead worker. Exception: {}"
.format(e))
if result and not result == 'ok':
logger.error(
"Worker responded unexpectedly: {}, deleting worker.".format(
result))
try:
rm_container(worker['cid'])
Worker.delete_worker(actor_id, worker_id)
except Exception as e:
logger.error(
"Got error removing/deleting worker: {}".format(e))
else:
# worker is healthy so update last health check:
Worker.update_worker_health_time(actor_id, worker_id)
logger.info("Worker ok.")
# now check if the worker has been idle beyond the ttl:
if ttl < 0:
# ttl < 0 means infinite life
logger.info("Infinite ttl configured; leaving worker")
return
# we don't shut down workers that are currently running:
if not worker['status'] == codes.BUSY:
last_execution = worker.get('last_execution_time', 0)
# if worker has made zero executions, use the create_time
if last_execution == 0:
last_execution = worker.get('create_time',
datetime.datetime.min)
logger.debug("using last_execution: {}".format(last_execution))
try:
assert type(last_execution) == datetime.datetime
except:
logger.error(
"Time received for TTL measurements is not of type datetime."
)
last_execution = datetime.datetime.min
if last_execution + datetime.timedelta(
seconds=ttl) < datetime.datetime.utcnow():
# shutdown worker
logger.info("Shutting down worker beyond ttl.")
shutdown_worker(actor_id, worker['id'])
else:
logger.info("Still time left for this worker.")
if worker['status'] == codes.ERROR:
# shutdown worker
logger.info("Shutting down worker in error status.")
shutdown_worker(actor_id, worker['id'])
