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# Copyright 2015 NTT corp.
# All Rights Reserved.
# Licensed 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.
import collections
import errno
import os
import signal
from oslo_log import log as logging
LOG = logging.getLogger(__name__)
class InstanceJobTracker(object):
def __init__(self):
self.jobs = collections.defaultdict(list)
def add_job(self, instance, pid):
"""Appends process_id of instance to cache.
This method will store the pid of a process in cache as
a key: value pair which will be used to kill the process if it
is running while deleting the instance. Instance uuid is used as
a key in the cache and pid will be the value.
:param instance: Object of instance
:param pid: Id of the process
"""
self.jobs[instance.uuid].append(pid)
def remove_job(self, instance, pid):
"""Removes pid of process from cache.
This method will remove the pid of a process from the cache.
:param instance: Object of instance
:param pid: Id of the process
"""
uuid = instance.uuid
if uuid in self.jobs and pid in self.jobs[uuid]:
self.jobs[uuid].remove(pid)
# remove instance.uuid if no pid's remaining
if not self.jobs[uuid]:
self.jobs.pop(uuid, None)
def terminate_jobs(self, instance):
"""Kills the running processes for given instance.
This method is used to kill all running processes of the instance if
it is deleted in between.
:param instance: Object of instance
"""
pids_to_remove = list(self.jobs.get(instance.uuid, []))
for pid in pids_to_remove:
try:
# Try to kill the process
os.kill(pid, signal.SIGKILL)
except OSError as exc:
if exc.errno != errno.ESRCH:
LOG.error('Failed to kill process %(pid)s '
'due to %(reason)s, while deleting the '
'instance.', {'pid': pid, 'reason': exc},
instance=instance)
try:
# Check if the process is still alive.
os.kill(pid, 0)
except OSError as exc:
if exc.errno != errno.ESRCH:
LOG.error('Unexpected error while checking process '
'%(pid)s.', {'pid': pid}, instance=instance)
else:
# The process is still around
LOG.warning("Failed to kill a long running process "
"%(pid)s related to the instance when "
"deleting it.", {'pid': pid}, instance=instance)
self.remove_job(instance, pid)
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