7fb3469c6a
All non-plugin exceptions are now located in one place. The constructor usage is now brought to one pattern. Change-Id: I794143889edf89a8ab79d0c6b8fb410da39081a0
95 lines
2.7 KiB
Python
95 lines
2.7 KiB
Python
# Copyright (c) 2013 Mirantis Inc.
|
|
#
|
|
# 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 os
|
|
import pickle
|
|
import sys
|
|
|
|
from eventlet.green import subprocess
|
|
from eventlet import timeout as e_timeout
|
|
from oslo_log import log as logging
|
|
|
|
from sahara import context
|
|
from sahara import exceptions
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
def _get_sub_executable():
|
|
return '%s/_sahara-subprocess' % os.path.dirname(sys.argv[0])
|
|
|
|
|
|
def start_subprocess():
|
|
return subprocess.Popen((sys.executable, _get_sub_executable()),
|
|
close_fds=True,
|
|
stdin=subprocess.PIPE,
|
|
stdout=subprocess.PIPE,
|
|
stderr=subprocess.PIPE)
|
|
|
|
|
|
def run_in_subprocess(proc, func, args=(), kwargs={}, interactive=False):
|
|
try:
|
|
pickle.dump(func, proc.stdin)
|
|
pickle.dump(args, proc.stdin)
|
|
pickle.dump(kwargs, proc.stdin)
|
|
proc.stdin.flush()
|
|
|
|
if not interactive:
|
|
result = pickle.load(proc.stdout)
|
|
|
|
if 'exception' in result:
|
|
raise exceptions.SubprocessException(result['exception'])
|
|
|
|
return result['output']
|
|
finally:
|
|
# NOTE(dmitryme): in openstack/common/processutils.py it
|
|
# is suggested to sleep a little between calls to multiprocessing.
|
|
# That should allow it make some necessary cleanup
|
|
context.sleep(0)
|
|
|
|
|
|
def _finish(cleanup_func):
|
|
cleanup_func()
|
|
sys.stdin.close()
|
|
sys.stdout.close()
|
|
sys.stderr.close()
|
|
sys.exit(0)
|
|
|
|
|
|
def shutdown_subprocess(proc, cleanup_func):
|
|
try:
|
|
with e_timeout.Timeout(5):
|
|
# timeout would mean that our single-threaded subprocess
|
|
# is hung on previous task which blocks _finish to complete
|
|
run_in_subprocess(proc, _finish, (cleanup_func,))
|
|
except BaseException:
|
|
# exception could be caused by either timeout, or
|
|
# successful shutdown, ignoring anyway
|
|
pass
|
|
finally:
|
|
kill_subprocess(proc)
|
|
|
|
|
|
def kill_subprocess(proc):
|
|
proc.stdin.close()
|
|
proc.stdout.close()
|
|
proc.stderr.close()
|
|
|
|
try:
|
|
proc.kill()
|
|
except OSError:
|
|
# could be caused by process already dead, so ignoring
|
|
pass
|