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# Copyright 2015-2016 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.
""" VNF Controller interface
"""
import logging
import pexpect
from conf import settings
from vnfs.vnf.vnf import IVnf
class VnfController(object):
"""VNF controller class
Used to set-up and control VNFs for specified scenario
Attributes:
_vnf_class: A class object representing the VNF to be used.
_deployment: A string describing the scenario to set-up in the
constructor.
_vnfs: A list of vnfs controlled by the controller.
"""
def __init__(self, deployment, vnf_class):
"""Sets up the VNF infrastructure based on deployment scenario
:param vnf_class: The VNF class to be used.
"""
# reset VNF ID counter for each testcase
IVnf.reset_vnf_counter()
# setup controller with requested number of VNFs
self._logger = logging.getLogger(__name__)
self._vnf_class = vnf_class
self._deployment = deployment.lower()
self._vnfs = []
if self._deployment == 'pvp':
vm_number = 1
elif (self._deployment.startswith('pvvp') or
self._deployment.startswith('pvpv')):
if len(self._deployment) > 4:
vm_number = int(self._deployment[4:])
else:
vm_number = 2
else:
raise RuntimeError('Deployment {} is not supported by '
'VnfController.'.format(self._deployment))
if vm_number:
self._logger.debug('Check configuration for %s guests.', vm_number)
settings.check_vm_settings(vm_number)
# enforce that GUEST_NIC_NR is 1 or even number of NICs
updated = False
nics_nr = settings.getValue('GUEST_NICS_NR')
for index in range(len(nics_nr)):
if nics_nr[index] > 1 and nics_nr[index] % 2:
updated = True
nics_nr[index] = int(nics_nr[index] / 2) * 2
if updated:
settings.setValue('GUEST_NICS_NR', nics_nr)
self._logger.warning('Odd number of NICs was detected. Configuration '
'was updated to GUEST_NICS_NR = %s',
settings.getValue('GUEST_NICS_NR'))
self._vnfs = [vnf_class() for _ in range(vm_number)]
self._logger.debug('__init__ ' + str(len(self._vnfs)) +
' VNF[s] with ' + ' '.join(map(str, self._vnfs)))
def get_vnfs(self):
"""Returns a list of vnfs controlled by this controller.
"""
self._logger.debug('get_vnfs ' + str(len(self._vnfs)) +
' VNF[s] with ' + ' '.join(map(str, self._vnfs)))
return self._vnfs
def get_vnfs_number(self):
"""Returns a number of vnfs controlled by this controller.
"""
self._logger.debug('get_vnfs_number ' + str(len(self._vnfs)) +
' VNF[s]')
return len(self._vnfs)
def start(self):
"""Boots all VNFs set-up by __init__.
This is a blocking function.
"""
self._logger.debug('start ' + str(len(self._vnfs)) +
' VNF[s] with ' + ' '.join(map(str, self._vnfs)))
try:
for vnf in self._vnfs:
vnf.start()
except pexpect.TIMEOUT:
self.stop()
raise
def stop(self):
"""Stops all VNFs set-up by __init__.
This is a blocking function.
"""
self._logger.debug('stop ' + str(len(self._vnfs)) +
' VNF[s] with ' + ' '.join(map(str, self._vnfs)))
for vnf in self._vnfs:
vnf.stop()
def __enter__(self):
self.start()
def __exit__(self, type_, value, traceback):
self.stop()
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