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#!/usr/bin/env python
#
# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Shutdown adb_logcat_monitor and print accumulated logs.
To test, call './adb_logcat_printer.py <base_dir>' where
<base_dir> contains 'adb logcat -v threadtime' files named as
logcat_<deviceID>_<sequenceNum>
The script will print the files to out, and will combine multiple
logcats from a single device if there is overlap.
Additionally, if a <base_dir>/LOGCAT_MONITOR_PID exists, the script
will attempt to terminate the contained PID by sending a SIGINT and
monitoring for the deletion of the aforementioned file.
"""
import cStringIO
import logging
import os
import re
import signal
import sys
import time
# Set this to debug for more verbose output
LOG_LEVEL = logging.INFO
def CombineLogFiles(list_of_lists, logger):
"""Splices together multiple logcats from the same device.
Args:
list_of_lists: list of pairs (filename, list of timestamped lines)
logger: handler to log events
Returns:
list of lines with duplicates removed
"""
cur_device_log = ['']
for cur_file, cur_file_lines in list_of_lists:
# Ignore files with just the logcat header
if len(cur_file_lines) < 2:
continue
common_index = 0
# Skip this step if list just has empty string
if len(cur_device_log) > 1:
try:
line = cur_device_log[-1]
# Used to make sure we only splice on a timestamped line
if re.match('^\d{2}-\d{2} \d{2}:\d{2}:\d{2}.\d{3} ', line):
common_index = cur_file_lines.index(line)
else:
logger.warning('splice error - no timestamp in "%s"?', line.strip())
except ValueError:
# The last line was valid but wasn't found in the next file
cur_device_log += ['***** POSSIBLE INCOMPLETE LOGCAT *****']
logger.info('Unable to splice %s. Incomplete logcat?', cur_file)
cur_device_log += ['*'*30 + ' %s' % cur_file]
cur_device_log.extend(cur_file_lines[common_index:])
return cur_device_log
def FindLogFiles(base_dir):
"""Search a directory for logcat files.
Args:
base_dir: directory to search
Returns:
Mapping of device_id to a sorted list of file paths for a given device
"""
logcat_filter = re.compile('^logcat_(\w+)_(\d+)$')
# list of tuples (<device_id>, <seq num>, <full file path>)
filtered_list = []
for cur_file in os.listdir(base_dir):
matcher = logcat_filter.match(cur_file)
if matcher:
filtered_list += [(matcher.group(1), int(matcher.group(2)),
os.path.join(base_dir, cur_file))]
filtered_list.sort()
file_map = {}
for device_id, _, cur_file in filtered_list:
if not device_id in file_map:
file_map[device_id] = []
file_map[device_id] += [cur_file]
return file_map
def GetDeviceLogs(log_filenames, logger):
"""Read log files, combine and format.
Args:
log_filenames: mapping of device_id to sorted list of file paths
logger: logger handle for logging events
Returns:
list of formatted device logs, one for each device.
"""
device_logs = []
for device, device_files in log_filenames.iteritems():
logger.debug('%s: %s', device, str(device_files))
device_file_lines = []
for cur_file in device_files:
with open(cur_file) as f:
device_file_lines += [(cur_file, f.read().splitlines())]
combined_lines = CombineLogFiles(device_file_lines, logger)
# Prepend each line with a short unique ID so it's easy to see
# when the device changes. We don't use the start of the device
# ID because it can be the same among devices. Example lines:
# AB324: foo
# AB324: blah
device_logs += [('\n' + device[-5:] + ': ').join(combined_lines)]
return device_logs
def ShutdownLogcatMonitor(base_dir, logger):
"""Attempts to shutdown adb_logcat_monitor and blocks while waiting."""
try:
monitor_pid_path = os.path.join(base_dir, 'LOGCAT_MONITOR_PID')
with open(monitor_pid_path) as f:
monitor_pid = int(f.readline())
logger.info('Sending SIGTERM to %d', monitor_pid)
os.kill(monitor_pid, signal.SIGTERM)
i = 0
while True:
time.sleep(.2)
if not os.path.exists(monitor_pid_path):
return
if not os.path.exists('/proc/%d' % monitor_pid):
logger.warning('Monitor (pid %d) terminated uncleanly?', monitor_pid)
return
logger.info('Waiting for logcat process to terminate.')
i += 1
if i >= 10:
logger.warning('Monitor pid did not terminate. Continuing anyway.')
return
except (ValueError, IOError, OSError):
logger.exception('Error signaling logcat monitor - continuing')
def main(base_dir, output_file):
log_stringio = cStringIO.StringIO()
logger = logging.getLogger('LogcatPrinter')
logger.setLevel(LOG_LEVEL)
sh = logging.StreamHandler(log_stringio)
sh.setFormatter(logging.Formatter('%(asctime)-2s %(levelname)-8s'
' %(message)s'))
logger.addHandler(sh)
try:
# Wait at least 5 seconds after base_dir is created before printing.
#
# The idea is that 'adb logcat > file' output consists of 2 phases:
# 1 Dump all the saved logs to the file
# 2 Stream log messages as they are generated
#
# We want to give enough time for phase 1 to complete. There's no
# good method to tell how long to wait, but it usually only takes a
# second. On most bots, this code path won't occur at all, since
# adb_logcat_monitor.py command will have spawned more than 5 seconds
# prior to called this shell script.
try:
sleep_time = 5 - (time.time() - os.path.getctime(base_dir))
except OSError:
sleep_time = 5
if sleep_time > 0:
logger.warning('Monitor just started? Sleeping %.1fs', sleep_time)
time.sleep(sleep_time)
assert os.path.exists(base_dir), '%s does not exist' % base_dir
ShutdownLogcatMonitor(base_dir, logger)
separator = '\n' + '*' * 80 + '\n\n'
for log in GetDeviceLogs(FindLogFiles(base_dir), logger):
output_file.write(log)
output_file.write(separator)
with open(os.path.join(base_dir, 'eventlog')) as f:
output_file.write('\nLogcat Monitor Event Log\n')
output_file.write(f.read())
except:
logger.exception('Unexpected exception')
logger.info('Done.')
sh.flush()
output_file.write('\nLogcat Printer Event Log\n')
output_file.write(log_stringio.getvalue())
if __name__ == '__main__':
if len(sys.argv) == 1:
print 'Usage: %s <base_dir>' % sys.argv[0]
sys.exit(1)
sys.exit(main(sys.argv[1], sys.stdout))
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