OpenStack Networking (Neutron)
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# Copyright 2013 Red Hat, 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 eventlet
from neutron._i18n import _
from neutron.agent.common import async_process
from neutron.agent.linux import utils
from neutron.common import utils as common_utils
from neutron.tests.functional import base
class AsyncProcessTestFramework(base.BaseLoggingTestCase):
def setUp(self):
super(AsyncProcessTestFramework, self).setUp()
self.test_file_path = self.get_temp_file_path('test_async_process.tmp')
self.data = [str(x) for x in range(4)]
with open(self.test_file_path, 'w') as f:
f.writelines('%s\n' % item for item in self.data)
def _check_stdout(self, proc):
# Ensure that all the output from the file is read
output = []
while output != self.data:
new_output = list(proc.iter_stdout())
if new_output:
output += new_output
eventlet.sleep(0.01)
class TestAsyncProcess(AsyncProcessTestFramework):
def _safe_stop(self, proc):
try:
proc.stop()
except async_process.AsyncProcessException:
pass
def test_stopping_async_process_lifecycle(self):
proc = async_process.AsyncProcess(['tail', '-f',
self.test_file_path])
self.addCleanup(self._safe_stop, proc)
proc.start(block=True)
self._check_stdout(proc)
proc.stop(block=True)
# Ensure that the process and greenthreads have stopped
proc._process.wait()
self.assertEqual(proc._process.returncode, -9)
for watcher in proc._watchers:
watcher.wait()
def test_async_process_respawns(self):
proc = async_process.AsyncProcess(['tail', '-f',
self.test_file_path],
respawn_interval=0)
self.addCleanup(self._safe_stop, proc)
proc.start()
# Ensure that the same output is read twice
self._check_stdout(proc)
pid = proc.pid
utils.execute(['kill', '-9', pid])
common_utils.wait_until_true(
lambda: proc.is_active() and pid != proc.pid,
timeout=5,
sleep=0.01,
exception=RuntimeError(_("Async process didn't respawn")))
self._check_stdout(proc)