blob: 295c8aca908d8ced158f7b40873a66f45c777dfd [file] [log] [blame]
# Copyright 2016 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 collections
import re
from autotest_lib.client.common_lib import error
from autotest_lib.client.common_lib import utils
LogcatLine = collections.namedtuple('LogcatLine', ['pid', 'tag', 'message'])
def wait_for_logcat_log(message_tag, message_pattern,
process_id=None, timeout_seconds=30, host=None):
"""Wait for a line to show up in logcat.
@param message_tag: string "tag" of the line, as understood by logcat.
@param message_pattern: regular expression pattern that describes the
entire text of the message to look for (e.g. '.*' matches all
messages). This is in grep's regex language.
@param process_id: optional integer process id to match on.
@param timeout_seconds: number of seconds to wait for the log line.
@param host: host object to look for the log line on. Defaults to
our local host.
run = if host is not None else
process_id_option = ''
if process_id is not None:
process_id_option = '--pid %d' % process_id
result = run('logcat %s --format=process -e %s -m 1' % (
process_id_option, message_pattern),
if result is None:
raise error.TestFail('Timed out waiting for a log with message "%s"' %
lines = result.stdout.strip().splitlines()
if len(lines) == 0:
raise error.TestError('Logcat did not return any lines')
line = lines[-1]
match = re.match(r'^.\( *(\d+)\) (.*) \(([^(]+)\)$', line)
if match:
return LogcatLine(,,
raise error.TestError('Failed to match logcat line "%s"' % line)