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# Copyright 2016 Cisco Systems, 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
#
# 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.
import os
import subprocess
import yaml
from log import LOG
class TrafficServerException(Exception):
pass
class TrafficServer(object):
"""Base class for traffic servers."""
class TRexTrafficServer(TrafficServer):
"""Creates configuration file for TRex and runs server."""
def __init__(self, trex_base_dir='/opt/trex'):
contents = os.listdir(trex_base_dir)
# only one version of TRex should be supported in container
assert len(contents) == 1
self.trex_dir = os.path.join(trex_base_dir, contents[0])
def run_server(self, traffic_profile, filename='/etc/trex_cfg.yaml'):
"""
Runs TRex server for specified traffic profile.
:param traffic_profile: traffic profile object based on config file
:param filename: path where to save TRex config file
"""
cfg = self.__save_config(traffic_profile, filename)
cores = traffic_profile.cores
subprocess.Popen(['nohup', '/bin/bash', '-c',
'./t-rex-64 -i -c {} --iom 0 --no-scapy-server --close-at-end --vlan'
' --cfg {} &> /tmp/trex.log & disown'.format(cores, cfg)],
cwd=self.trex_dir)
LOG.info('TRex server is running...')
def __save_config(self, traffic_profile, filename):
ifs = ",".join([repr(pci) for pci in traffic_profile.pcis])
result = """# Config generated by NFVBench tool
- port_limit : 2
version : 2
interfaces : [{ifs}]""".format(ifs=ifs)
yaml.safe_load(result)
if os.path.exists(filename):
os.remove(filename)
with open(filename, 'w') as f:
f.write(result)
return filename
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