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# Copyright (c) 2012 Intel, LLC
# Copyright (c) 2012 OpenStack Foundation
#
# 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.
"""
Test multiprocess enabled API service.
"""
import fixtures
import os
import signal
import time
import traceback
from nova.openstack.common import log as logging
from nova import service
from nova.tests.integrated import integrated_helpers
LOG = logging.getLogger(__name__)
class MultiprocessWSGITest(integrated_helpers._IntegratedTestBase):
def _start_api_service(self):
# Process will be started in _spawn()
self.osapi = service.WSGIService("osapi_compute")
self.auth_url = 'http://%s:%s/v2' % (self.osapi.host, self.osapi.port)
LOG.info('auth_url = %s' % self.auth_url)
def _get_flags(self):
self.workers = 2
f = super(MultiprocessWSGITest, self)._get_flags()
f['osapi_compute_workers'] = self.workers
return f
def _spawn(self):
pid = os.fork()
if pid == 0:
# NOTE(johannes): We can't let the child processes exit back
# into the unit test framework since then we'll have multiple
# processes running the same tests (and possibly forking more
# processes that end up in the same situation). So we need
# to catch all exceptions and make sure nothing leaks out, in
# particlar SystemExit, which is raised by sys.exit(). We use
# os._exit() which doesn't have this problem.
status = 0
try:
launcher = service.ProcessLauncher()
launcher.launch_server(self.osapi, workers=self.osapi.workers)
launcher.wait()
except SystemExit as exc:
status = exc.code
except BaseException:
# We need to be defensive here too
try:
traceback.print_exc()
except BaseException:
LOG.error("Couldn't print traceback")
status = 2
# Really exit
os._exit(status)
self.pid = pid
# Wait at most 10 seconds to spawn workers
cond = lambda: self.workers == len(self._get_workers())
timeout = 10
self._wait(cond, timeout)
workers = self._get_workers()
self.assertEqual(len(workers), self.workers)
return workers
def _wait(self, cond, timeout):
start = time.time()
while True:
if cond():
break
if time.time() - start > timeout:
break
time.sleep(.1)
def tearDown(self):
if self.pid:
# Make sure all processes are stopped
os.kill(self.pid, signal.SIGTERM)
try:
# Make sure we reap our test process
self._reap_test()
except fixtures.TimeoutException:
# If the child gets stuck or is too slow in existing
# after receiving the SIGTERM, gracefully handle the
# timeout exception and try harder to kill it. We need
# to do this otherwise the child process can hold up
# the test run
os.kill(self.pid, signal.SIGKILL)
super(MultiprocessWSGITest, self).tearDown()
def _reap_test(self):
pid, status = os.waitpid(self.pid, 0)
self.pid = None
return status
def _get_workers(self):
f = os.popen('ps ax -o pid,ppid,command')
# Skip ps header
f.readline()
processes = [tuple(int(p) for p in l.strip().split()[:2])
for l in f.readlines()]
return [p for p, pp in processes if pp == self.pid]
def test_killed_worker_recover(self):
start_workers = self._spawn()
# kill one worker and check if new worker can come up
LOG.info('pid of first child is %s' % start_workers[0])
os.kill(start_workers[0], signal.SIGTERM)
# Wait at most 5 seconds to respawn a worker
cond = lambda: start_workers != self._get_workers()
timeout = 5
self._wait(cond, timeout)
# Make sure worker pids don't match
end_workers = self._get_workers()
LOG.info('workers: %r' % end_workers)
self.assertNotEqual(start_workers, end_workers)
# check if api service still works
flavors = self.api.get_flavors()
self.assertTrue(len(flavors) > 0, 'Num of flavors > 0.')
def _terminate_with_signal(self, sig):
self._spawn()
# check if api service is working
flavors = self.api.get_flavors()
self.assertTrue(len(flavors) > 0, 'Num of flavors > 0.')
os.kill(self.pid, sig)
# Wait at most 5 seconds to kill all workers
cond = lambda: not self._get_workers()
timeout = 5
self._wait(cond, timeout)
workers = self._get_workers()
LOG.info('workers: %r' % workers)
self.assertFalse(workers, 'OS processes left %r' % workers)
def test_terminate_sigkill(self):
self._terminate_with_signal(signal.SIGKILL)
status = self._reap_test()
self.assertTrue(os.WIFSIGNALED(status))
self.assertEqual(os.WTERMSIG(status), signal.SIGKILL)
def test_terminate_sigterm(self):
self._terminate_with_signal(signal.SIGTERM)
status = self._reap_test()
self.assertTrue(os.WIFEXITED(status))
self.assertEqual(os.WEXITSTATUS(status), 0)
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