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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 errno
import fcntl
from functools import wraps
import json
from log import LOG
import os
import re
import signal
import subprocess
class TimeoutError(Exception):
pass
def timeout(seconds=10, error_message=os.strerror(errno.ETIME)):
def decorator(func):
def _handle_timeout(signum, frame):
raise TimeoutError(error_message)
def wrapper(*args, **kwargs):
signal.signal(signal.SIGALRM, _handle_timeout)
signal.alarm(seconds)
try:
result = func(*args, **kwargs)
finally:
signal.alarm(0)
return result
return wraps(func)(wrapper)
return decorator
def save_json_result(result, json_file, std_json_path, service_chain, service_chain_count,
flow_count, frame_sizes):
"""Save results in json format file."""
filepaths = []
if json_file:
filepaths.append(json_file)
if std_json_path:
name_parts = [service_chain, str(service_chain_count), str(flow_count)] + list(frame_sizes)
filename = '-'.join(name_parts) + '.json'
filepaths.append(os.path.join(std_json_path, filename))
if filepaths:
for file_path in filepaths:
LOG.info('Saving results in json file: ' + file_path + "...")
with open(file_path, 'w') as jfp:
json.dump(result,
jfp,
indent=4,
sort_keys=True,
separators=(',', ': '),
default=lambda obj: obj.to_json())
def byteify(data, ignore_dicts=False):
# if this is a unicode string, return its string representation
if isinstance(data, unicode):
return data.encode('utf-8')
# if this is a list of values, return list of byteified values
if isinstance(data, list):
return [byteify(item, ignore_dicts=ignore_dicts) for item in data]
# if this is a dictionary, return dictionary of byteified keys and values
# but only if we haven't already byteified it
if isinstance(data, dict) and not ignore_dicts:
return {byteify(key, ignore_dicts=ignore_dicts): byteify(value, ignore_dicts=ignore_dicts)
for key, value in data.iteritems()}
# if it's anything else, return it in its original form
return data
def dict_to_json_dict(record):
return json.loads(json.dumps(record, default=lambda obj: obj.to_json()))
def get_intel_pci(nic_ports):
"""Returns the first two PCI addresses of sorted PCI list for Intel NIC (i40e, ixgbe)"""
hx = r'[0-9a-fA-F]'
regex = r'{hx}{{4}}:({hx}{{2}}:{hx}{{2}}\.{hx}{{1}}).*(drv={driver}|.*unused=.*{driver})'
try:
trex_base_dir = '/opt/trex'
contents = os.listdir(trex_base_dir)
trex_dir = os.path.join(trex_base_dir, contents[0])
process = subprocess.Popen(['python', 'dpdk_setup_ports.py', '-s'],
cwd=trex_dir,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
devices, _ = process.communicate()
except Exception:
devices = ''
for driver in ['i40e', 'ixgbe']:
matches = re.findall(regex.format(hx=hx, driver=driver), devices)
if matches:
pcis = map(lambda x: x[0], matches)
if len(pcis) < 2:
continue
pcis.sort()
return [pcis[port_index] for port_index in nic_ports]
return []
multiplier_map = {
'K': 1000,
'M': 1000000,
'G': 1000000000
}
def parse_flow_count(flow_count):
flow_count = str(flow_count)
input_fc = flow_count
multiplier = 1
if flow_count[-1].upper() in multiplier_map:
multiplier = multiplier_map[flow_count[-1].upper()]
flow_count = flow_count[:-1]
try:
flow_count = int(flow_count)
except ValueError:
raise Exception("Unknown flow count format '{}'".format(input_fc))
return flow_count * multiplier
class RunLock(object):
"""
Attempts to lock file and run current instance of NFVbench as the first,
otherwise raises exception.
"""
def __init__(self, path='/tmp/nfvbench.lock'):
self._path = path
self._fd = None
def __enter__(self):
try:
self._fd = os.open(self._path, os.O_CREAT)
fcntl.flock(self._fd, fcntl.LOCK_EX | fcntl.LOCK_NB)
except (OSError, IOError):
raise Exception('Other NFVbench process is running. Please wait')
def __exit__(self, *args):
fcntl.flock(self._fd, fcntl.LOCK_UN)
os.close(self._fd)
self._fd = None
# Try to remove the lock file, but don't try too hard because it is unnecessary.
try:
os.unlink(self._path)
except (OSError, IOError):
pass
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