[Android] Convert to DeviceUtils versions of IsOnline, HasRoot, and EnableRoot.

build/android/pylib/device/device_utils.py

Index: build/android/pylib/device/device_utils.py
diff --git a/build/android/pylib/device/device_utils.py b/build/android/pylib/device/device_utils.py
index 1440961aa5ec8f31b0a8dc88aab4a945a5dec3a5..defd544db71b15aaa75d793d75c7f4e9d2aad90b 100644
--- a/build/android/pylib/device/device_utils.py
+++ b/build/android/pylib/device/device_utils.py
@@ -16,6 +16,7 @@ import sys
 import pylib.android_commands
 from pylib.device import adb_wrapper
 from pylib.device import decorators
+from pylib.device import device_errors
 
 CHROME_SRC_DIR = os.path.abspath(
     os.path.join(os.path.dirname(__file__), '..', '..', '..', '..'))
@@ -78,7 +79,20 @@ def RestartServer():
 
 class DeviceUtils(object):
 
-  def __init__(self, device):
+  def __init__(self, device, default_timeout=_DEFAULT_TIMEOUT,
+               default_retries=_DEFAULT_RETRIES):
+    """ DeviceUtils constructor.
+
+    Args:
+      device: Either a device serial, an existing AdbWrapper instance, an
+              an existing AndroidCommands instance, or nothing.
+      default_timeout: An integer containing the default number of seconds to
+                       wait for an operation to complete if no explicit value
+                       is provided.
+      default_retries: An integer containing the default number or times an
+                       operation should be retried on failure if no explicit
+                       value is provided.
+    """
     self.old_interface = None
     if isinstance(device, basestring):
       self.old_interface = pylib.android_commands.AndroidCommands(device)
@@ -88,4 +102,55 @@ class DeviceUtils(object):
       self.old_interface = device
     elif not device:
       self.old_interface = pylib.android_commands.AndroidCommands()
+    else:
+      raise ValueError('Unsupported type passed for argument "device"')
+    self._default_timeout = default_timeout
+    self._default_retries = default_retries
+
+  @decorators.WithTimeoutAndRetriesFromInstance(
+      '_default_timeout', '_default_retries')
+  def IsOnline(self, timeout=None, retries=None):
+    """ Checks whether the device is online.
+
+    Args:
+      timeout: An integer containing the number of seconds to wait for the

[frankf, 2014/05/15 01:27:59]

DRY applies to docstrings as well ;)

[jbudorick, 2014/05/15 05:03:54]

"An integer containing the seconds to wait ...?" I'm not sure about that. Sounds
a little weird.

[frankf, 2014/05/15 17:40:08]

To clarify, you've repeated the same Args section for all the methods below.
It'd be good to define them once and refer to it instead of duplicating it.

+               operation to complete.
+      retries: An integer containing the number of times the operation should
+               be retried if it fails.
+    Returns:
+      True if the device is online, False otherwise.
+    """
+    return self.old_interface.IsOnline()
+
+  @decorators.WithTimeoutAndRetriesFromInstance(
+      '_default_timeout', '_default_retries')
+  def HasRoot(self, timeout=None, retries=None):
+    """ Checks whether or not adbd has root priveleges.

[frankf, 2014/05/15 01:27:59]

typo

+
+    Args:
+      timeout: An integer containing the number of seconds to wait for the
+               operation to complete.
+      retries: An integer containing the number of times the operation should
+               be retried if it fails.
+    Returns:
+      True if adbd has root priveleges, False otherwise.
+    """
+    return self.old_interface.IsRootEnabled()
+
+  @decorators.WithTimeoutAndRetriesFromInstance(
+      '_default_timeout', '_default_retries')
+  def EnableRoot(self, timeout=None, retries=None):
+    """ Restarts adbd with root priveleges.
+
+    Args:
+      timeout: An integer containing the number of seconds to wait for the
+               operation to complete.
+      retries: An integer containing the number of times the operation should
+               be retried if it fails.
+    Raises:
+      CommandFailedError if root could not be enabled.
+    """
+    if not self.old_interface.EnableAdbRoot():

[frankf, 2014/05/15 01:27:59]

Why can't you inline EnableAdbRoot here?

[jbudorick, 2014/05/15 05:03:54]

What exactly do you mean by "inline" in a python context? Moving the
AndroidCommands implementation in here?

[frankf, 2014/05/15 17:40:08]

Yes, otherwise you would to do another pass to move the implementation here. I
thought part of the refactoring is to review the existing implementation. Or are
you just concerned with the interface at this point?


On 2014/05/15 05:03:54, jbudorick wrote:

+      raise device_errors.CommandFailedError(
+          'adb root', 'Could not enable root.')