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# Copyright 2015 Intel Corporation.
#
# 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.
"""Class wrapper for controlling an OVS instance.
Wraps a pair of ``ovs-vswitchd`` and ``ovsdb-server`` processes.
"""
import os
import logging
import pexpect
from conf import settings
from tools import tasks
_OVS_VAR_DIR = settings.getValue('OVS_VAR_DIR')
_OVS_ETC_DIR = settings.getValue('OVS_ETC_DIR')
_LOG_FILE_VSWITCHD = os.path.join(
settings.getValue('LOG_DIR'), settings.getValue('LOG_FILE_VSWITCHD'))
class VSwitchd(tasks.Process):
"""Class wrapper for controlling an OVS instance.
Wraps a pair of ``ovs-vswitchd`` and ``ovsdb-server`` processes.
"""
_ovsdb_pid = None
_logfile = _LOG_FILE_VSWITCHD
_ovsdb_pidfile_path = os.path.join(settings.getValue('LOG_DIR'), "ovsdb_pidfile.pid")
_proc_name = 'ovs-vswitchd'
def __init__(self, timeout=30, vswitchd_args=None, expected_cmd=None):
"""Initialise the wrapper with a specific start timeout and extra
parameters.
:param timeout: Timeout to wait for application to start.
:param vswitchd_args: Command line parameters for vswitchd.
:returns: None
"""
self._logger = logging.getLogger(__name__)
self._timeout = timeout
self._expect = expected_cmd
vswitchd_args = vswitchd_args or []
ovs_vswitchd_bin = os.path.join(
settings.getValue('OVS_DIR'), 'vswitchd', 'ovs-vswitchd')
self._cmd = ['sudo', '-E', ovs_vswitchd_bin] + vswitchd_args
# startup/shutdown
def start(self):
""" Start ``ovsdb-server`` and ``ovs-vswitchd`` instance.
:returns: None
:raises: pexpect.EOF, pexpect.TIMEOUT
"""
self._reset_ovsdb()
self._start_ovsdb() # this has to be started first
try:
super(VSwitchd, self).start()
self.relinquish()
except (pexpect.EOF, pexpect.TIMEOUT) as exc:
logging.error("Exception during VSwitch start.")
self._kill_ovsdb()
raise exc
def kill(self, signal='-15', sleep=2):
"""Kill ``ovs-vswitchd`` instance if it is alive.
:returns: None
"""
self._logger.info('Killing ovs-vswitchd...')
self._kill_ovsdb()
super(VSwitchd, self).kill(signal, sleep)
# helper functions
def _reset_ovsdb(self):
"""Reset system for 'ovsdb'.
:returns: None
"""
self._logger.info('Resetting system after last run...')
tasks.run_task(['sudo', 'rm', '-rf', _OVS_VAR_DIR], self._logger)
tasks.run_task(['sudo', 'mkdir', '-p', _OVS_VAR_DIR], self._logger)
tasks.run_task(['sudo', 'rm', '-rf', _OVS_ETC_DIR], self._logger)
tasks.run_task(['sudo', 'mkdir', '-p', _OVS_ETC_DIR], self._logger)
tasks.run_task(['sudo', 'rm', '-f',
os.path.join(_OVS_ETC_DIR, 'conf.db')],
self._logger)
self._logger.info('System reset after last run.')
def _start_ovsdb(self):
"""Start ``ovsdb-server`` instance.
:returns: None
"""
ovsdb_tool_bin = os.path.join(
settings.getValue('OVS_DIR'), 'ovsdb', 'ovsdb-tool')
tasks.run_task(['sudo', ovsdb_tool_bin, 'create',
os.path.join(_OVS_ETC_DIR, 'conf.db'),
os.path.join(settings.getValue('OVS_DIR'), 'vswitchd',
'vswitch.ovsschema')],
self._logger,
'Creating ovsdb configuration database...')
ovsdb_server_bin = os.path.join(
settings.getValue('OVS_DIR'), 'ovsdb', 'ovsdb-server')
tasks.run_background_task(
['sudo', ovsdb_server_bin,
'--remote=punix:%s' % os.path.join(_OVS_VAR_DIR, 'db.sock'),
'--remote=db:Open_vSwitch,Open_vSwitch,manager_options',
'--pidfile=' + self._ovsdb_pidfile_path, '--overwrite-pidfile'],
self._logger,
'Starting ovsdb-server...')
def _kill_ovsdb(self):
"""Kill ``ovsdb-server`` instance.
:returns: None
"""
with open(self._ovsdb_pidfile_path, "r") as pidfile:
ovsdb_pid = pidfile.read().strip()
self._logger.info("Killing ovsdb with pid: " + ovsdb_pid)
if ovsdb_pid:
tasks.run_task(['sudo', 'kill', '-15', str(ovsdb_pid)],
self._logger, 'Killing ovsdb-server...')
@staticmethod
def get_db_sock_path():
"""Method returns location of db.sock file
:returns: path to db.sock file.
"""
return os.path.join(_OVS_VAR_DIR, 'db.sock')
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