blob: b862a2a822cd7c1799c60ef42c740c6c5ede8b18 [file] [log] [blame]
# Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import logging
import re
IW_REMOTE_EVENT_LOG_FILE = '/tmp/iw_event.log'
class IwEventLogger(object):
"""Context enclosing the use of iw event logger."""
def __init__(self, host, command_iw, local_file):
self._host = host
self._command_iw = command_iw
self._local_file = local_file
self._pid = None
def __enter__(self):
return self
def __exit__(self, exception, value, traceback):
def local_file(self):
"""@return string local host path for log file."""
return self._local_file
def start(self):
"""Start event logger.
This function will start iw event process in remote host, and redirect
output to a temporary file in remote host.
command = '%s event -t > %s & echo $!' % (self._command_iw,
self._pid = int(
def stop(self):
"""Stop event logger.
This function will kill iw event process, and copy the log file from
remote to local.
if self._pid is None:
# Kill iw event process'kill %d' % self._pid, ignore_status=True)
self._pid = None
# Copy iw event log file from remote host
self._host.get_file(IW_REMOTE_EVENT_LOG_FILE, self._local_file)'iw event log saved to %s', self._local_file)
def get_association_time(self):
"""Parse local log file and return association time.
This function will parse the iw event log to determine the time it
takes from start of scan to being connected.
Here are example of lines to be parsed:
1393961008.058711: wlan0 (phy #0): scan started
1393961019.758599: wlan0 (phy #0): connected to 04:f0:21:03:7d:bd
@returns float number of seconds it take from start of scan to
connected. Return None if unable to determine the time based on
the log.
start_time = None
end_time = None
# Parse file to figure out the time when scanning started and the time
# when client is connected.
with open(self._local_file, 'r') as file:
for line in file.readlines():
parse_line = re.match('\s*(\d+).(\d+): (\w.*): (\w.*)', line)
if parse_line:
time_integer =
time_decimal =
message =
time_stamp = float('%s.%s' % (time_integer, time_decimal))
if (message.startswith('scan started') and
start_time is None):
start_time = time_stamp
if message.startswith('connected'):
if start_time is None:
return None
end_time = time_stamp
return None
return end_time - start_time