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# Copyright 2016 Google Inc.
#
# 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 io
import json
import logging
import os
from mobly import utils
MOBLY_CONTROLLER_CONFIG_NAME = 'IPerfServer'
def create(configs):
results = []
for c in configs:
try:
results.append(IPerfServer(c, logging.log_path))
except:
pass
return results
def destroy(objs):
for ipf in objs:
try:
ipf.stop()
except:
pass
class IPerfResult:
def __init__(self, result_path):
try:
with io.open(result_path, 'r', encoding='utf-8') as f:
self.result = json.load(f)
except ValueError:
with io.open(result_path, 'r', encoding='utf-8') as f:
# Possibly a result from interrupted iperf run, skip first line
# and try again.
lines = f.readlines()[1:]
self.result = json.loads(''.join(lines))
def _has_data(self):
"""Checks if the iperf result has valid throughput data.
Returns:
True if the result contains throughput data. False otherwise.
"""
return ('end' in self.result) and ('sum' in self.result['end'])
def get_json(self):
"""
Returns:
The raw json output from iPerf.
"""
return self.result
@property
def error(self):
if 'error' not in self.result:
return None
return self.result['error']
@property
def avg_rate(self):
"""Average receiving rate in MB/s over the entire run.
If the result is not from a success run, this property is None.
"""
if not self._has_data or 'sum' not in self.result['end']:
return None
bps = self.result['end']['sum']['bits_per_second']
return bps / 8 / 1024 / 1024
@property
def avg_receive_rate(self):
"""Average receiving rate in MB/s over the entire run. This data may
not exist if iperf was interrupted.
If the result is not from a success run, this property is None.
"""
if not self._has_data or 'sum_received' not in self.result['end']:
return None
bps = self.result['end']['sum_received']['bits_per_second']
return bps / 8 / 1024 / 1024
@property
def avg_send_rate(self):
"""Average sending rate in MB/s over the entire run. This data may
not exist if iperf was interrupted.
If the result is not from a success run, this property is None.
"""
if not self._has_data or 'sum_sent' not in self.result['end']:
return None
bps = self.result['end']['sum_sent']['bits_per_second']
return bps / 8 / 1024 / 1024
class IPerfServer:
"""Class that handles iperf3 operations."""
def __init__(self, port, log_path):
self.port = port
self.log_path = os.path.join(log_path, 'iPerf{}'.format(self.port))
self.iperf_str = 'iperf3 -s -J -p {}'.format(port)
self.iperf_process = None
self.log_files = []
self.started = False
def start(self, extra_args='', tag=''):
"""Starts iperf server on specified port.
Args:
extra_args: A string representing extra arguments to start iperf
server with.
tag: Appended to log file name to identify logs from different
iperf runs.
"""
if self.started:
return
utils.create_dir(self.log_path)
if tag:
tag = tag + ','
out_file_name = 'IPerfServer,{},{}{}.log'.format(
self.port, tag, len(self.log_files)
)
full_out_path = os.path.join(self.log_path, out_file_name)
cmd = '%s %s > %s' % (self.iperf_str, extra_args, full_out_path)
self.iperf_process = utils.start_standing_subprocess(cmd, shell=True)
self.log_files.append(full_out_path)
self.started = True
def stop(self):
if self.started:
utils.stop_standing_subprocess(self.iperf_process)
self.started = False
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