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# 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 profile_chrome import controllers
from profile_chrome import util
_DDMS_SAMPLING_FREQUENCY_US = 100
class DdmsController(controllers.BaseController):
def __init__(self, device, package_info):
controllers.BaseController.__init__(self)
self._device = device
self._package = package_info.package
self._output_file = None
self._supports_sampling = self._SupportsSampling()
def __repr__(self):
return 'ddms profile'
def _SupportsSampling(self):
for line in self._device.RunShellCommand('am --help'):
if re.match(r'.*am profile start.*--sampling', line):
return True
return False
def StartTracing(self, _):
self._output_file = (
'/data/local/tmp/ddms-profile-%s' % util.GetTraceTimestamp())
cmd = 'am profile start '
if self._supports_sampling:
cmd += '--sampling %d ' % _DDMS_SAMPLING_FREQUENCY_US
cmd += '%s %s' % (self._package, self._output_file)
self._device.RunShellCommand(cmd)
def StopTracing(self):
self._device.RunShellCommand('am profile stop %s' % self._package)
def PullTrace(self):
if not self._output_file:
return None
# Wait for the trace file to get written.
time.sleep(1)
host_file = os.path.join(
os.path.curdir, os.path.basename(self._output_file))
self._device.PullFile(self._output_file, host_file)
return host_file
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