[android] Adds AdbWrapper which is the base of the eventual AndroidCommands replacement.

build/android/pylib/device/adb_wrapper.py

Index: build/android/pylib/device/adb_wrapper.py
diff --git a/build/android/pylib/device/adb_wrapper.py b/build/android/pylib/device/adb_wrapper.py
new file mode 100644
index 0000000000000000000000000000000000000000..aa21ce9425f3b2be5c8a07d4bd4dc33fba751b5e
--- /dev/null
+++ b/build/android/pylib/device/adb_wrapper.py
@@ -0,0 +1,423 @@
+# Copyright (c) 2013 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 wraps Android's adb tool.
+
+This is a thin wrapper around the adb interface. Any additional complexity
+should be delegated to a higher level (ex. DeviceUtils).
+"""
+
+import errno
+import logging
+import os
+
+from pylib import cmd_helper
+
+from pylib.utils import reraiser_thread
+from pylib.utils import timeout_retry
+
+_DEFAULT_TIMEOUT = 30
+_DEFAULT_RETRIES = 2
+
+
+class BaseError(Exception):
+  """Base exception for all device and command errors."""
+  pass
+
+
+class CommandFailedError(BaseError):
+  """Exception for command failures."""
+
+  def __init__(self, cmd, msg, device=None):
+    super(CommandFailedError, self).__init__(
+        (('device %s: ' % device) if device else '') +
+        'adb command \'%s\' failed with message: \'%s\'' % (' '.join(cmd), msg))
+
+
+class CommandTimeoutError(BaseError):
+  """Exception for command timeouts."""
+  pass
+
+
+def _VerifyLocalFileExists(path):
+  """Verifies a local file exists.
+
+  Args:
+    path: Path to the local file.
+
+  Raises:
+    IOError: If the file doesn't exist.
+  """
+  if not os.path.exists(path):
+    raise IOError(errno.ENOENT, os.strerror(errno.ENOENT), path)
+
+
+class AdbWrapper(object):
+  """A wrapper around a local Android Debug Bridge executable."""
+
+  def __init__(self, device_serial):
+    """Initializes the AdbWrapper.
+
+    Args:
+      device_serial: The device serial number as a string.
+    """
+    self._device_serial = str(device_serial)
+
+  @classmethod
+  def _AdbCmd(cls, arg_list, timeout, retries, check_error=True):
+    """Runs an adb command with a timeout and retries.
+
+    Args:
+      arg_list: A list of arguments to adb.
+      timeout: Timeout in seconds.
+      retries: Number of retries.
+      check_error: Check that the command doesn't return an error message. This
+        does NOT check the return code of shell commands.
+
+    Returns:
+      The output of the command.
+    """
+    cmd = ['adb'] + arg_list
+
+    # This method runs inside the timeout/retries.
+    def RunCmd():
+      exit_code, output = cmd_helper.GetCmdStatusAndOutput(cmd)
+      if exit_code != 0:
+        raise CommandFailedError(
+            cmd, 'returned non-zero exit code %s, output: %s' %
+            (exit_code, output))
+      # This catches some errors, including when the device drops offline;
+      # unfortunately adb is very inconsistent with error reporting so many
+      # command failures present differently.
+      if check_error and output[:len('error:')] == 'error:':
+        raise CommandFailedError(arg_list, output)
+      return output
+
+    try:
+      return timeout_retry.Run(RunCmd, timeout, retries)
+    except reraiser_thread.TimeoutError as e:
+      raise CommandTimeoutError(str(e))
+
+  def _DeviceAdbCmd(self, arg_list, timeout, retries, check_error=True):
+    """Runs an adb command on the device associated with this object.
+
+    Args:
+      arg_list: A list of arguments to adb.
+      timeout: Timeout in seconds.
+      retries: Number of retries.
+      check_error: Check that the command doesn't return an error message. This
+        does NOT check the return code of shell commands.
+
+    Returns:
+      The output of the command.
+    """
+    return self._AdbCmd(
+        ['-s', self._device_serial] + arg_list, timeout, retries,
+        check_error=check_error)
+
+  def __eq__(self, other):
+    """Consider instances equal if they refer to the same device.
+
+    Args:
+      other: The instance to compare equality with.
+
+    Returns:
+      True if the instances are considered equal, false otherwise.
+    """
+    return self._device_serial == str(other)
+
+  def __str__(self):
+    """The string representation of an instance.
+
+    Returns:
+      The device serial number as a string.
+    """
+    return self._device_serial
+
+  def __repr__(self):
+    return '%s(\'%s\')' % (self.__class__.__name__, self)
+
+  # TODO(craigdh): Determine the filter criteria that should be supported.
+  @classmethod
+  def GetDevices(cls, timeout=_DEFAULT_TIMEOUT, retries=_DEFAULT_RETRIES):
+    """Get the list of active attached devices.
+
+    Args:
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+
+    Yields:
+      AdbWrapper instances.
+    """
+    output = cls._AdbCmd(['devices'], timeout, retries)
+    lines = [line.split() for line in output.split('\n')]
+    return [AdbWrapper(line[0]) for line in lines
+            if len(line) == 2 and line[1] == 'device'] 
+
+  def GetDeviceSerial(self):
+    """Gets the device serial number associated with this object.
+
+    Returns:
+      Device serial number as a string.
+    """
+    return self._device_serial
+
+  def Push(self, local, remote, timeout=60*5, retries=_DEFAULT_RETRIES):
+    """Pushes a file from the host to the device.
+
+    Args:
+      local: Path on the host filesystem.
+      remote: Path on the device filesystem.
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+    """
+    _VerifyLocalFileExists(local)
+    self._DeviceAdbCmd(['push', local, remote], timeout, retries)
+
+  def Pull(self, remote, local, timeout=60*5, retries=_DEFAULT_RETRIES):
+    """Pulls a file from the device to the host.
+
+    Args:
+      remote: Path on the device filesystem.
+      local: Path on the host filesystem.
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+    """
+    self._DeviceAdbCmd(['pull', remote, local], timeout, retries)
+    _VerifyLocalFileExists(local)
+
+  def Shell(self, command, expect_rc=None, timeout=_DEFAULT_TIMEOUT,
+            retries=_DEFAULT_RETRIES):
+    """Runs a shell command on the device.
+
+    Args:
+      command: The shell command to run.
+      expect_rc: (optional) If set checks that the command's return code matches
+        this value.
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+
+    Returns:
+      The output of the shell command as a string.
+
+    Raises:
+      CommandFailedError: If the return code doesn't match |expect_rc|.
+    """
+    if expect_rc is None:
+      actual_command = command
+    else:
+      actual_command = '%s; echo $?;' % command
+    output = self._DeviceAdbCmd(
+        ['shell', actual_command], timeout, retries, check_error=False)
+    if expect_rc is not None:
+      output_end = output.rstrip().rfind('\n') + 1
+      rc = output[output_end:].strip()
+      output = output[:output_end]
+      if int(rc) != expect_rc:
+        raise CommandFailedError(
+            ['shell', command],
+            'shell command exited with code: %s' % rc,
+            self._device_serial)
+    return output
+
+  def Logcat(self, filter_spec=None, timeout=_DEFAULT_TIMEOUT,
+             retries=_DEFAULT_RETRIES):
+    """Get the logcat output.
+
+    Args:
+      filter_spec: (optional) Spec to filter the logcat.
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+
+    Returns:
+      logcat output as a string.
+    """
+    cmd = ['logcat']
+    if filter_spec is not None:
+      cmd.append(filter_spec)
+    return self._DeviceAdbCmd(cmd, timeout, retries, check_error=False)
+
+  def Forward(self, local, remote, timeout=_DEFAULT_TIMEOUT,
+              retries=_DEFAULT_RETRIES):
+    """Forward socket connections from the local socket to the remote socket.
+
+    Sockets are specified by one of:
+      tcp:<port>
+      localabstract:<unix domain socket name>
+      localreserved:<unix domain socket name>
+      localfilesystem:<unix domain socket name>
+      dev:<character device name>
+      jdwp:<process pid> (remote only)
+
+    Args:
+      local: The host socket.
+      remote: The device socket.
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+    """
+    self._DeviceAdbCmd(['forward', str(local), str(remote)], timeout, retries)
+
+  def JDWP(self, timeout=_DEFAULT_TIMEOUT, retries=_DEFAULT_RETRIES):
+    """List of PIDs of processes hosting a JDWP transport.
+
+    Args:
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+
+    Returns:
+      A list of PIDs as strings.
+    """
+    return [a.strip() for a in
+            self._DeviceAdbCmd(['jdwp'], timeout, retries).split('\n')]
+
+  def Install(self, apk_path, forward_lock=False, reinstall=False,
+              sd_card=False, timeout=60*2, retries=_DEFAULT_RETRIES):
+    """Install an apk on the device.
+
+    Args:
+      apk_path: Host path to the APK file.
+      forward_lock: (optional) If set forward-locks the app.
+      reinstall: (optional) If set reinstalls the app, keeping its data.
+      sd_card: (optional) If set installs on the SD card.
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+    """
+    _VerifyLocalFileExists(apk_path)
+    cmd = ['install']
+    if forward_lock:
+      cmd.append('-l')
+    if reinstall:
+      cmd.append('-r')
+    if sd_card:
+      cmd.append('-s')
+    cmd.append(apk_path)
+    output = self._DeviceAdbCmd(cmd, timeout, retries)
+    if 'Success' not in output:
+      raise CommandFailedError(cmd, output)
+
+  def Uninstall(self, package, keep_data=False, timeout=_DEFAULT_TIMEOUT,
+                retries=_DEFAULT_RETRIES):
+    """Remove the app |package| from the device.
+
+    Args:
+      package: The package to uninstall.
+      keep_data: (optional) If set keep the data and cache directories.
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+    """
+    cmd = ['uninstall']
+    if keep_data:
+      cmd.append('-k')
+    cmd.append(package)
+    output = self._DeviceAdbCmd(cmd, timeout, retries)
+    if 'Failure' in output:
+      raise CommandFailedError(cmd, output)
+
+  def Backup(self, path, packages=None, apk=False, shared=False,
+             nosystem=True, include_all=False, timeout=_DEFAULT_TIMEOUT,
+             retries=_DEFAULT_RETRIES):
+    """Write an archive of the device's data to |path|.
+
+    Args:
+      path: Local path to store the backup file.
+      packages: List of to packages to be backed up.
+      apk: (optional) If set include the .apk files in the archive.
+      shared: (optional) If set buckup the device's SD card.
+      nosystem: (optional) If set exclude system applications.
+      include_all: (optional) If set back up all installed applications and
+        |packages| is optional.
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+    """
+    cmd = ['backup', path]
+    if apk:
+      cmd.append('-apk')
+    if shared:
+      cmd.append('-shared')
+    if nosystem:
+      cmd.append('-nosystem')
+    if include_all:
+      cmd.append('-all')
+    if packages:
+      cmd.extend(packages)
+    assert bool(packages) ^ bool(include_all), (
+        'Provide \'packages\' or set \'include_all\' but not both.')
+    ret = self._DeviceAdbCmd(cmd, timeout, retries)
+    _VerifyLocalFileExists(path)
+    return ret
+
+  def Restore(self, path, timeout=_DEFAULT_TIMEOUT, retries=_DEFAULT_RETRIES):
+    """Restore device contents from the backup archive.
+
+    Args:
+      path: Host path to the backup archive.
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+    """
+    _VerifyLocalFileExists(path)
+    self._DeviceAdbCmd(['restore'] + [path], timeout, retries)
+
+  def WaitForDevice(self, timeout=60*5, retries=_DEFAULT_RETRIES):
+    """Block until the device is online.
+
+    Args:
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+    """
+    self._DeviceAdbCmd(['wait-for-device'], timeout, retries)
+
+  def GetState(self, timeout=_DEFAULT_TIMEOUT, retries=_DEFAULT_RETRIES):
+    """Get device state.
+
+    Args:
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+
+    Returns:
+      One of 'offline', 'bootloader', or 'device'.
+    """
+    return self._DeviceAdbCmd(['get-state'], timeout, retries).strip()
+
+  def GetDevPath(self, timeout=_DEFAULT_TIMEOUT, retries=_DEFAULT_RETRIES):
+    """Gets the device path.
+
+    Args:
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+
+    Returns:
+      The device path (e.g. usb:3-4)
+    """
+    return self._DeviceAdbCmd(['get-devpath'], timeout, retries)
+
+  def Remount(self, timeout=_DEFAULT_TIMEOUT, retries=_DEFAULT_RETRIES):
+    """Remounts the /system partition on the device read-write."""
+    self._DeviceAdbCmd(['remount'], timeout, retries)
+
+  def Reboot(self, to_bootloader=False, timeout=60*5,
+             retries=_DEFAULT_RETRIES):
+    """Reboots the device.
+
+    Args:
+      to_bootloader: (optional) If set reboots to the bootloader.
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+    """
+    if to_bootloader:
+      cmd = ['reboot-bootloader']
+    else:
+      cmd = ['reboot']
+    self._DeviceAdbCmd(cmd, timeout, retries)
+
+  def Root(self, timeout=_DEFAULT_TIMEOUT, retries=_DEFAULT_RETRIES):
+    """Restarts the adbd daemon with root permissions, if possible.
+
+    Args:
+      timeout: (optional) Timeout per try in seconds.
+      retries: (optional) Number of retries to attempt.
+    """
+    output = self._DeviceAdbCmd(['root'], timeout, retries)
+    if 'cannot' in output:
+      raise CommandFailedError(['root'], output)
+