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# Copyright 2017-2018 Spirent Communications.
#
# 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.
"""
Wrapper file to create and manage Stressor-VM as loadgen
"""
import logging
import os
from tools import tasks
from tools.load_gen.load_gen import ILoadGenerator
from conf import settings as S
class QemuVM(tasks.Process):
"""
Class for controling an instance of QEMU
"""
def __init__(self, index):
self._running = False
self._logger = logging.getLogger(__name__)
self._number = index
pnumber = int(S.getValue('NN_BASE_VNC_PORT')) + self._number
cpumask = ",".join(S.getValue('NN_CORE_BINDING')[self._number])
self._monitor = '%s/vm%dmonitor' % ('/tmp', pnumber)
self._logfile = (os.path.join(S.getValue('LOG_DIR'),
S.getValue('NN_LOG_FILE')) +
str(self._number))
self._log_prefix = 'vnf_%d_cmd : ' % pnumber
name = 'NN%d' % index
vnc = ':%d' % pnumber
self._shared_dir = '%s/qemu%d_share' % ('/tmp', pnumber)
if not os.path.exists(self._shared_dir):
try:
os.makedirs(self._shared_dir)
except OSError as exp:
raise OSError("Failed to create shared directory %s: %s" %
self._shared_dir, exp)
self.nics_nr = S.getValue('NN_NICS_NR')[self._number]
self.image = S.getValue('NN_IMAGE')[self._number]
self._cmd = ['sudo', '-E', 'taskset', '-c', cpumask,
S.getValue('TOOLS')['qemu-system'],
'-m', S.getValue('NN_MEMORY')[self._number],
'-smp', S.getValue('NN_SMP')[self._number],
'-cpu', 'host,migratable=off',
'-drive', 'if={},file='.format(
S.getValue('NN_BOOT_DRIVE_TYPE')[self._number]) +
self.image, '-boot',
'c', '--enable-kvm',
'-monitor', 'unix:%s,server,nowait' % self._monitor,
'-nographic', '-vnc', str(vnc), '-name', name,
'-snapshot', '-net none', '-no-reboot',
'-drive',
'if=%s,format=raw,file=fat:rw:%s,snapshot=off' %
(S.getValue('NN_SHARED_DRIVE_TYPE')[self._number],
self._shared_dir)
]
def start(self):
"""
Start QEMU instance
"""
super(QemuVM, self).start()
self._running = True
def stop(self, sig, slp):
"""
Stops VNF instance.
"""
if self._running:
self._logger.info('Killing VNF...')
# force termination of VNF and wait to terminate; It will avoid
# sporadic reboot of host.
super(QemuVM, self).kill(signal=sig, sleep=slp)
# remove shared dir if it exists to avoid issues with file consistency
if os.path.exists(self._shared_dir):
tasks.run_task(['rm', '-f', '-r', self._shared_dir], self._logger,
'Removing content of shared directory...', True)
self._running = False
# pylint: disable=super-init-not-called
class StressorVM(ILoadGenerator):
"""
Wrapper Class for Load-Generation through stressor-vm
"""
def __init__(self, _config):
self.qvm_list = []
for vmindex in range(int(S.getValue('NN_COUNT'))):
qvm = QemuVM(vmindex)
self.qvm_list.append(qvm)
def start(self):
"""Start stressor VMs
"""
for nvm in self.qvm_list:
nvm.start()
def kill(self, signal='-9', sleep=2):
"""
Stop Stressor VMs
"""
for nvm in self.qvm_list:
nvm.stop(signal, sleep)
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