blob: 87353e3fbf4050c8b8c70c9246e268f54bcedb74 [file] [log] [blame]
# Copyright 2015 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.
import os
import re
import time
from pylib import flag_changer
from pylib.device import intent
from pylib.perf import cache_control
from profile_chrome import controllers
class ChromeStartupTracingController(controllers.BaseController):
def __init__(self, device, package_info, cold, url):
self._device = device
self._package_info = package_info
self._cold = cold
self._logcat_monitor = self._device.GetLogcatMonitor()
self._url = url
self._trace_file = None
self._trace_finish_re = re.compile(r' Completed startup tracing to (.*)')
def __repr__(self):
return 'Browser Startup Trace'
def _SetupTracing(self):
# TODO(lizeb): Figure out how to clean up the command-line file when
# _TearDownTracing() is not executed in StopTracing().
changer = flag_changer.FlagChanger(
self._device, self._package_info.cmdline_file)
changer.AddFlags(['--trace-startup'])
self._device.ForceStop(self._package_info.package)
if self._cold:
self._device.EnableRoot()
cache_control.CacheControl(self._device).DropRamCaches()
self._device.StartActivity(
intent.Intent(
package=self._package_info.package,
activity=self._package_info.activity,
data=self._url,
extras={'create_new_tab' : True}), blocking=True)
def _TearDownTracing(self):
changer = flag_changer.FlagChanger(
self._device, self._package_info.cmdline_file)
changer.RemoveFlags(['--trace-startup'])
def StartTracing(self, interval):
self._SetupTracing()
self._logcat_monitor.Start()
def StopTracing(self):
try:
self._trace_file = self._logcat_monitor.WaitFor(
self._trace_finish_re).group(1)
finally:
self._TearDownTracing()
def PullTrace(self):
# Wait a bit for the browser to finish writing the trace file.
time.sleep(3)
trace_file = self._trace_file.replace('/storage/emulated/0/', '/sdcard/')
host_file = os.path.join(os.path.curdir, os.path.basename(trace_file))
self._device.PullFile(trace_file, host_file)
return host_file