Add lots of utils, PRESUBMIT.py

py/utils/android_utils.py

Index: py/utils/android_utils.py
diff --git a/py/utils/android_utils.py b/py/utils/android_utils.py
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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.
+
+""" This module contains tools used by Android-specific buildbot scripts. """
+
+import os
+import re
+import shell_utils
+import shlex
+import sys
+import time
+
+
+CPU_SCALING_MODES = ['performance', 'interactive']
+DEVICE_LOOKUP = {'nexus_s': 'crespo',
+                 'xoom': 'stingray',
+                 'galaxy_nexus': 'toro',
+                 'nexus_4': 'mako',
+                 'nexus_7': 'grouper',
+                 'nexus_10': 'manta'}
+PROCESS_MONITOR_INTERVAL = 5.0 # Seconds
+SKIA_RUNNING = 'running'
+SKIA_RETURN_CODE_REPEATS = 10
+SUBPROCESS_TIMEOUT = 30.0
+
+
+def GotADB(adb):
+  """ Returns True iff ADB exists at the given location.
+
+  adb: string; possible path to the ADB executable.
+  """
+  try:
+    shell_utils.run([adb, 'version'], echo=False)
+    return True
+  except Exception:
+    return False
+
+
+def FindADB(hint=None):
+  """ Attempt to find the ADB program using the following sequence of steps.
+  Returns the path to ADB if it can be found, or None otherwise.
+  1. If a hint was provided, is it a valid path to ADB?
+  2. Is ADB in PATH?
+  3. Is there an environment variable for ADB?
+  4. If the ANDROID_SDK_ROOT variable is set, try to find ADB in the SDK
+     directory.
+  5. Try to find ADB in a list of common locations.
+
+  hint: string indicating a possible path to ADB.
+  """
+  # 1. If a hint was provided, does it point to ADB?
+  if hint:
+    if os.path.basename(hint) == 'adb':
+      adb = hint
+    else:
+      adb = os.path.join(hint, 'adb')
+    if GotADB(adb):
+      return adb
+
+  # 2. Is 'adb' in our PATH?
+  adb = 'adb'
+  if GotADB(adb):
+    return adb
+
+  # 3. Is there an environment variable for ADB?
+  adb = os.environ.get('ADB')
+  if GotADB(adb):
+    return adb
+
+  # 4. If ANDROID_SDK_ROOT is set, try to find ADB in the SDK directory.
+  sdk_dir = os.environ.get('ANDROID_SDK_ROOT', '')
+  adb = os.path.join(sdk_dir, 'platform-tools', 'adb')
+  if GotADB(adb):
+    return adb
+
+  # 4. Try to find ADB relative to this file.
+  common_locations = []
+  os_dir = None
+  if sys.platform.startswith('linux'):
+    os_dir = 'linux'
+  elif sys.platform.startswith('darwin'):
+    os_dir = 'mac'
+  else:
+    os_dir = 'win'
+  common_locations.append(os.path.join('platform_tools', 'android', 'bin',
+                                       os_dir, 'adb'))
+  common_locations.append(os.path.join(os.environ.get('HOME', ''),
+                          'android-sdk-%s' % os_dir))
+  for location in common_locations:
+    if GotADB(location):
+      return location
+
+  raise Exception('android_utils: Unable to find ADB!')
+
+
+PATH_TO_ADB = FindADB(hint=os.path.join('platform_tools', 'android', 'bin',
+                                        'linux', 'adb'))
+
+
+def RunADB(serial, cmd, echo=True, attempts=5, secs_between_attempts=10,
+           timeout=None):
+  """ Run 'cmd' on an Android device, using ADB.  No return value; throws an
+  exception if the command fails more than the allotted number of attempts.
+
+  serial: string indicating the serial number of the target device
+  cmd: string; the command to issue on the device
+  attempts: number of times to attempt the command
+  secs_between_attempts: number of seconds to wait between attempts
+  timeout: optional, integer indicating the maximum elapsed time in seconds
+  """
+  adb_cmd = [PATH_TO_ADB, '-s', serial]
+  adb_cmd += cmd
+  shell_utils.run_retry(adb_cmd, echo=echo, attempts=attempts,
+                        secs_between_attempts=secs_between_attempts)
+
+
+def ADBShell(serial, cmd, echo=True):
+  """ Runs 'cmd' in the ADB shell on an Android device and returns the exit
+  code.
+
+  serial: string indicating the serial number of the target device
+  cmd: string; the command to issue on the device
+  """
+  # ADB doesn't exit with the exit code of the command we ran. It only exits
+  # non-zero when ADB itself encountered a problem. Therefore, we have to use
+  # the shell to print the exit code for the command and parse that from stdout.
+  adb_cmd = '%s -s %s shell "%s; echo \$?"' % (PATH_TO_ADB, serial,
+                                               ' '.join(cmd))
+  output = shell_utils.run(adb_cmd, shell=True, echo=echo)
+  output_lines = output.splitlines()
+  try:
+    real_exitcode = int(output_lines[-1].rstrip())
+  except ValueError:
+    real_exitcode = -1
+  if real_exitcode != 0:
+    raise Exception('Command failed with code %s' % real_exitcode)
+  return '\n'.join(output_lines[:-1])
+
+
+def ADBKill(serial, process, kill_app=False):
+  """ Kill a process running on an Android device.
+
+  serial: string indicating the serial number of the target device
+  process: string indicating the name of the process to kill
+  kill_app: bool indicating whether the process is an Android app, as opposed
+      to a normal executable process.
+  """
+  if kill_app:
+    ADBShell(serial, ['am', 'kill', process])
+  else:
+    try:
+      stdout = shell_utils.run('%s -s %s shell ps | grep %s' % (PATH_TO_ADB,
+                                                                serial,
+                                                                process),
+                               shell=True)
+    except Exception:
+      return
+    for line in stdout.split('\n'):
+      if line != '':
+        split = shlex.split(line)
+        if len(split) < 2:
+          continue
+        pid = split[1]
+        ADBShell(serial, ['kill', pid])
+    # Raise an exception if any Skia processes are still running.
+    try:
+      stdout = shell_utils.run('%s -s %s shell ps | grep %s' % (PATH_TO_ADB,
+                                                                serial,
+                                                                process),
+                               shell=True)
+    except Exception:
+      return
+    if stdout:
+      raise Exception('There are still some skia processes running:\n%s\n'
+                      'Maybe the device should be rebooted?' % stdout)
+
+
+def GetSerial(device_type):
+  """ Determine the serial number of the *first* connected device with the
+  specified type.  The ordering of 'adb devices' is not documented, and the
+  connected devices do not appear to be ordered by serial number.  Therefore,
+  we have to assume that, in the case of multiple devices of the same type being
+  connected to one host, we cannot predict which device will be chosen.
+
+  device_type: string indicating the 'common name' for the target device
+  """
+  if not device_type in DEVICE_LOOKUP:
+    raise ValueError('Unknown device: %s!' % device_type)
+  device_name = DEVICE_LOOKUP[device_type]
+  output = shell_utils.run_retry('%s devices' % PATH_TO_ADB, shell=True,
+                                 attempts=5)
+  print output
+  lines = output.split('\n')
+  device_ids = []
+  for line in lines:
+    # Filter garbage lines
+    if line != '' and not ('List of devices attached' in line) and \
+        line[0] != '*':
+      device_ids.append(line.split('\t')[0])
+  for device_id in device_ids:
+    print 'Finding type for id %s' % device_id
+    # Get device name
+    name_line = shell_utils.run_retry(
+        '%s -s %s shell cat /system/build.prop | grep "ro.product.device="' % (
+            PATH_TO_ADB, device_id), shell=True, attempts=5)
+    print name_line
+    name = name_line.split('=')[-1].rstrip()
+    # Just return the first attached device of the requested model.
+    if device_name in name:
+      return device_id
+  raise Exception('No %s device attached!' % device_name)
+
+
+def SetCPUScalingMode(serial, mode):
+  """ Set the CPU scaling governor for the device with the given serial number
+  to the given mode.
+
+  serial: string indicating the serial number of the device whose scaling mode
+          is to be modified
+  mode:   string indicating the desired CPU scaling mode.  Acceptable values
+          are listed in CPU_SCALING_MODES.
+  """
+  if mode not in CPU_SCALING_MODES:
+    raise ValueError('mode must be one of: %s' % CPU_SCALING_MODES)
+  cpu_dirs = shell_utils.run('%s -s %s shell ls /sys/devices/system/cpu' % (
+      PATH_TO_ADB, serial), echo=False, shell=True)
+  cpu_dirs_list = cpu_dirs.split('\n')
+  regex = re.compile('cpu\d')
+  for cpu_dir_from_list in cpu_dirs_list:
+    cpu_dir = cpu_dir_from_list.rstrip()
+    if regex.match(cpu_dir):
+      path = '/sys/devices/system/cpu/%s/cpufreq/scaling_governor' % cpu_dir
+      path_found = shell_utils.run('%s -s %s shell ls %s' % (
+                                       PATH_TO_ADB, serial, path),
+                                   echo=False, shell=True).rstrip()
+      if path_found == path:
+        # Unfortunately, we can't directly change the scaling_governor file over
+        # ADB. Instead, we write a script to do so, push it to the device, and
+        # run it.
+        old_mode = shell_utils.run('%s -s %s shell cat %s' % (
+                                       PATH_TO_ADB, serial, path),
+                                   echo=False, shell=True).rstrip()
+        print 'Current scaling mode for %s is: %s' % (cpu_dir, old_mode)
+        filename = 'skia_cpuscale.sh'
+        with open(filename, 'w') as script_file:
+          script_file.write('echo %s > %s\n' % (mode, path))
+        os.chmod(filename, 0777)
+        RunADB(serial, ['push', filename, '/system/bin'], echo=False)
+        RunADB(serial, ['shell', filename], echo=True)
+        RunADB(serial, ['shell', 'rm', '/system/bin/%s' % filename], echo=False)
+        os.remove(filename)
+        new_mode = shell_utils.run('%s -s %s shell cat %s' % (
+                                       PATH_TO_ADB, serial, path),
+                                   echo=False, shell=True).rstrip()
+        print 'New scaling mode for %s is: %s' % (cpu_dir, new_mode)
+
+
+def IsAndroidShellRunning(serial):
+  """ Find the status of the Android shell for the device with the given serial
+  number. Returns True if the shell is running and False otherwise.
+
+  serial: string indicating the serial number of the target device.
+  """
+  if 'Error:' in ADBShell(serial, ['pm', 'path', 'android'], echo=False):
+    return False
+  return True
+
+
+def StopShell(serial, timeout=60):
+  """ Halt the Android runtime on the device with the given serial number.
+  Blocks until the shell reports that it has stopped.
+
+  serial: string indicating the serial number of the target device.
+  timeout: maximum allotted time, in seconds.
+  """
+  ADBShell(serial, ['stop'])
+  start_time = time.time()
+  while IsAndroidShellRunning(serial):
+    time.sleep(1)
+    if time.time() - start_time > timeout:
+      raise Exception('Timeout while attempting to stop the Android runtime.')
+
+
+def StartShell(serial, timeout=60):
+  """ Start the Android runtime on the device with the given serial number.
+  Blocks until the shell reports that it has started.
+
+  serial: string indicating the serial number of the target device.
+  timeout: maximum allotted time, in seconds.
+  """
+  ADBShell(serial, ['start'])
+  start_time = time.time()
+  while not IsAndroidShellRunning(serial):
+    time.sleep(1)
+    if time.time() - start_time > timeout:
+      raise Exception('Timeout while attempting to start the Android runtime.')
+
+
+def RunSkia(serial, cmd, release, device):
+  """ Run the given command through skia_launcher on a given device.
+
+  serial: string indicating the serial number of the target device.
+  cmd: list of strings; the command line to run.
+  release: bool; whether or not to run the app in Release mode.
+  device: string indicating the target device.
+  """
+  RunADB(serial, ['logcat', '-c'])
+  try:
+    os.environ['SKIA_ANDROID_VERBOSE_SETUP'] = '1'
+    cmd_to_run = [os.path.join('platform_tools', 'android', 'bin',
+                               'android_run_skia')]
+    if release:
+      cmd_to_run.extend(['--release'])
+    cmd_to_run.extend(['-d', device])
+    cmd_to_run.extend(['-s', serial])
+    cmd_to_run.extend(cmd)
+    shell_utils.run(cmd_to_run)
+  finally:
+    RunADB(serial, ['logcat', '-d', '-v', 'time'])