OpenStack Networking (Neutron)
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# Copyright 2015 Mirantis Inc.
# 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
# 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 signal
import socket
import time
import traceback
from unittest import mock
import httplib2
from neutron_lib import worker as neutron_worker
from oslo_config import cfg
from oslo_log import log
import psutil
from neutron.common import utils
from neutron import manager
from neutron import service
from neutron.tests.functional import base
from neutron import wsgi
LOG = log.getLogger(__name__)
# Those messages will be written to temporary file each time
# start/reset methods are called.
FAKE_START_MSG = b"start"
FAKE_RESET_MSG = b"reset"
TARGET_PLUGIN = 'neutron.plugins.ml2.plugin.Ml2Plugin'
class TestNeutronServer(base.BaseLoggingTestCase):
def setUp(self):
super(TestNeutronServer, self).setUp()
self.service_pid = None
self.workers = None
self.temp_file = self.get_temp_file_path("test_server.tmp")
self.health_checker = self._check_active
self.pipein, self.pipeout = os.pipe()
def _destroy_workers(self):
if self.service_pid:
# Make sure all processes are stopped
os.kill(self.service_pid, signal.SIGKILL)
def _start_server(self, callback, workers):
"""Run a given service.
:param callback: callback that will start the required service
:param workers: number of service workers
:returns: list of spawned workers' pids
self.workers = workers
# Fork a new process in which server will be started
pid = os.fork()
if pid == 0:
status = 0
except SystemExit as exc:
status = exc.code
except BaseException:
status = 2
# Really exit
self.service_pid = pid
# If number of workers is 1 it is assumed that we run
# a service in the current process.
if self.workers > 1:
# Wait at most 10 seconds to spawn workers
condition = lambda: self.workers == len(self._get_workers())
condition, timeout=10, sleep=0.1,
"Failed to start %d workers." % self.workers))
workers = self._get_workers()
self.assertEqual(len(workers), self.workers)
return workers
# Wait for a service to start.
utils.wait_until_true(self.health_checker, timeout=10, sleep=0.1,
"Failed to start service."))
return [self.service_pid]
def _get_workers(self):
"""Get the list of processes in which WSGI server is running."""
def safe_ppid(proc):
return proc.ppid()
except psutil.NoSuchProcess:
return None
if self.workers > 1:
return [ for proc in psutil.process_iter()
if safe_ppid(proc) == self.service_pid]
return [ for proc in psutil.process_iter()
if == self.service_pid]
def _check_active(self):
"""Dummy service activity check."""
return True
def _fake_start(self):
with open(self.temp_file, 'ab') as f:
def _fake_reset(self):
with open(self.temp_file, 'ab') as f:
def _test_restart_service_on_sighup(self, service, workers=1):
"""Test that a service correctly (re)starts on receiving SIGHUP.
1. Start a service with a given number of workers.
2. Send SIGHUP to the service.
3. Wait for workers (if any) to (re)start.
self._start_server(callback=service, workers=workers)
os.kill(self.service_pid, signal.SIGHUP)
# After sending SIGHUP it is expected that there will be as many
# FAKE_RESET_MSG as number of workers + one additional for main
# process
expected_msg = (
FAKE_START_MSG * workers + FAKE_RESET_MSG * (workers + 1))
# Wait for temp file to be created and its size reaching the expected
# value
expected_size = len(expected_msg)
def is_temp_file_ok():
LOG.debug("Checking file %s", self.temp_file)
if not os.path.isfile(self.temp_file):
LOG.debug("File %s not exists.", self.temp_file)
return False
temp_file_size = os.stat(self.temp_file).st_size
LOG.debug("Size of file %s is %s. Expected size: %s",
self.temp_file, temp_file_size, expected_size)
return temp_file_size == expected_size
utils.wait_until_true(is_temp_file_ok, timeout=5, sleep=1)
except utils.TimerTimeout:
if not os.path.isfile(self.temp_file):
raise RuntimeError(
"Timed out waiting for file %(filename)s to be created" %
{'filename': self.temp_file})
raise RuntimeError(
"Expected size for file %(filename)s: %(size)s, current "
"size: %(current_size)s" %
{'filename': self.temp_file,
'size': expected_size,
'current_size': os.stat(self.temp_file).st_size})
# Verify that start has been called twice for each worker (one for
# initial start, and the second one on SIGHUP after children were
# terminated).
with open(self.temp_file, 'rb') as f:
res = f.readline()
self.assertEqual(expected_msg, res)
class TestWsgiServer(TestNeutronServer):
"""Tests for neutron.wsgi.Server."""
def setUp(self):
super(TestWsgiServer, self).setUp()
self.health_checker = self._check_active
self.port = None
def application(environ, start_response):
"""A primitive test application."""
response_body = 'Response'
status = '200 OK'
response_headers = [('Content-Type', 'text/plain'),
('Content-Length', str(len(response_body)))]
start_response(status, response_headers)
return [response_body]
def _check_active(self):
"""Check a wsgi service is active by making a GET request."""
port = int(, 5))
conn = httplib2.HTTPConnectionWithTimeout("localhost", port)
conn.request("GET", "/")
resp = conn.getresponse()
return resp.status == 200
except socket.error:
return False
def _run_wsgi(self, workers=1):
"""Start WSGI server with a test application."""
# Mock start method to check that children are started again on
# receiving SIGHUP.
with mock.patch("neutron.wsgi.WorkerService.start") as start_method,\
mock.patch("neutron.wsgi.WorkerService.reset") as reset_method:
start_method.side_effect = self._fake_start
reset_method.side_effect = self._fake_reset
server = wsgi.Server("Test")
server.start(self.application, 0, "",
# Memorize a port that was chosen for the service
self.port = server.port
os.write(self.pipeout, bytes(str(self.port), 'utf-8'))
def test_restart_wsgi_on_sighup_multiple_workers(self):
class TestRPCServer(TestNeutronServer):
"""Tests for neutron RPC server."""
def setUp(self):
super(TestRPCServer, self).setUp()
self.setup_coreplugin('ml2', load_plugins=False)
self._plugin_patcher = mock.patch(TARGET_PLUGIN, autospec=True)
self.plugin = self._plugin_patcher.start()
self.plugin.return_value.rpc_workers_supported = True
def _serve_rpc(self, workers=1):
"""Start RPC server with a given number of workers."""
# Mock start method to check that children are started again on
# receiving SIGHUP.
with mock.patch("neutron.service.RpcWorker.start") as start_method,\
"neutron.service.RpcWorker.reset") as reset_method,\
"") as get_plugin:
start_method.side_effect = self._fake_start
reset_method.side_effect = self._fake_reset
get_plugin.return_value = self.plugin
CONF.set_override("rpc_workers", workers)
# not interested in state report workers specifically
CONF.set_override("rpc_state_report_workers", 0)
rpc_workers_launcher = service.start_rpc_workers()
def test_restart_rpc_on_sighup_multiple_workers(self):
class TestPluginWorker(TestNeutronServer):
"""Ensure that a plugin returning Workers spawns workers"""
def setUp(self):
super(TestPluginWorker, self).setUp()
self.setup_coreplugin('ml2', load_plugins=False)
self._plugin_patcher = mock.patch(TARGET_PLUGIN, autospec=True)
self.plugin = self._plugin_patcher.start()
def _start_plugin(self, workers=1):
with mock.patch('') as gp:
gp.return_value = self.plugin
plugin_workers_launcher = service.start_plugins_workers()
def test_start(self):
class FakeWorker(neutron_worker.BaseWorker):
def start(self):
def wait(self):
def stop(self):
def reset(self):
# Make both ABC happy and ensure 'self' is correct
FakeWorker.start = self._fake_start
FakeWorker.reset = self._fake_reset
workers = [FakeWorker()]
self.plugin.return_value.get_workers.return_value = workers