[Android] Move some pylib modules into devil/

build/android/pylib/utils/timeout_retry.py

Index: build/android/pylib/utils/timeout_retry.py
diff --git a/build/android/pylib/utils/timeout_retry.py b/build/android/pylib/utils/timeout_retry.py
index 61f7c70baa91396bed71ecdb64a7695d3e74f11f..e566f4506ecd9c4a6d3279672d953e74c06af03d 100644
--- a/build/android/pylib/utils/timeout_retry.py
+++ b/build/android/pylib/utils/timeout_retry.py
@@ -1,167 +1,8 @@
-# Copyright 2013 The Chromium Authors. All rights reserved.
+# 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.
 
-"""A utility to run functions with timeouts and retries."""
-# pylint: disable=W0702
+# pylint: disable=unused-wildcard-import
+# pylint: disable=wildcard-import
 
-import logging
-import threading
-import time
-import traceback
-
-from pylib.utils import reraiser_thread
-from pylib.utils import watchdog_timer
-
-
-class TimeoutRetryThread(reraiser_thread.ReraiserThread):
-  def __init__(self, func, timeout, name):
-    super(TimeoutRetryThread, self).__init__(func, name=name)
-    self._watcher = watchdog_timer.WatchdogTimer(timeout)
-    self._expired = False
-
-  def GetWatcher(self):
-    """Returns the watchdog keeping track of this thread's time."""
-    return self._watcher
-
-  def GetElapsedTime(self):
-    return self._watcher.GetElapsed()
-
-  def GetRemainingTime(self, required=0, msg=None):
-    """Get the remaining time before the thread times out.
-
-    Useful to send as the |timeout| parameter of async IO operations.
-
-    Args:
-      required: minimum amount of time that will be required to complete, e.g.,
-        some sleep or IO operation.
-      msg: error message to show if timing out.
-
-    Returns:
-      The number of seconds remaining before the thread times out, or None
-      if the thread never times out.
-
-    Raises:
-      reraiser_thread.TimeoutError if the remaining time is less than the
-        required time.
-    """
-    remaining = self._watcher.GetRemaining()
-    if remaining is not None and remaining < required:
-      if msg is None:
-        msg = 'Timeout expired'
-      if remaining > 0:
-        msg += (', wait of %.1f secs required but only %.1f secs left'
-                % (required, remaining))
-      self._expired = True
-      raise reraiser_thread.TimeoutError(msg)
-    return remaining
-
-  def LogTimeoutException(self):
-    """Log the exception that terminated this thread."""
-    if not self._expired:
-      return
-    logging.critical('*' * 80)
-    logging.critical('%s on thread %r', self._exc_info[0].__name__, self.name)
-    logging.critical('*' * 80)
-    fmt_exc = ''.join(traceback.format_exception(*self._exc_info))
-    for line in fmt_exc.splitlines():
-      logging.critical(line.rstrip())
-    logging.critical('*' * 80)
-
-
-def CurrentTimeoutThread():
-  """Get the current thread if it is a TimeoutRetryThread.
-
-  Returns:
-    The current thread if it is a TimeoutRetryThread, otherwise None.
-  """
-  current_thread = threading.current_thread()
-  if isinstance(current_thread, TimeoutRetryThread):
-    return current_thread
-  else:
-    return None
-
-
-def WaitFor(condition, wait_period=5, max_tries=None):
-  """Wait for a condition to become true.
-
-  Repeadly call the function condition(), with no arguments, until it returns
-  a true value.
-
-  If called within a TimeoutRetryThread, it cooperates nicely with it.
-
-  Args:
-    condition: function with the condition to check
-    wait_period: number of seconds to wait before retrying to check the
-      condition
-    max_tries: maximum number of checks to make, the default tries forever
-      or until the TimeoutRetryThread expires.
-
-  Returns:
-    The true value returned by the condition, or None if the condition was
-    not met after max_tries.
-
-  Raises:
-    reraiser_thread.TimeoutError if the current thread is a TimeoutRetryThread
-      and the timeout expires.
-  """
-  condition_name = condition.__name__
-  timeout_thread = CurrentTimeoutThread()
-  while max_tries is None or max_tries > 0:
-    result = condition()
-    if max_tries is not None:
-      max_tries -= 1
-    msg = ['condition', repr(condition_name), 'met' if result else 'not met']
-    if timeout_thread:
-      msg.append('(%.1fs)' % timeout_thread.GetElapsedTime())
-    logging.info(' '.join(msg))
-    if result:
-      return result
-    if timeout_thread:
-      timeout_thread.GetRemainingTime(wait_period,
-          msg='Timed out waiting for %r' % condition_name)
-    time.sleep(wait_period)
-  return None
-
-
-def Run(func, timeout, retries, args=None, kwargs=None):
-  """Runs the passed function in a separate thread with timeouts and retries.
-
-  Args:
-    func: the function to be wrapped.
-    timeout: the timeout in seconds for each try.
-    retries: the number of retries.
-    args: list of positional args to pass to |func|.
-    kwargs: dictionary of keyword args to pass to |func|.
-
-  Returns:
-    The return value of func(*args, **kwargs).
-  """
-  if not args:
-    args = []
-  if not kwargs:
-    kwargs = {}
-
-  # The return value uses a list because Python variables are references, not
-  # values. Closures make a copy of the reference, so updating the closure's
-  # reference wouldn't update where the original reference pointed.
-  ret = [None]
-  def RunOnTimeoutThread():
-    ret[0] = func(*args, **kwargs)
-
-  num_try = 1
-  while True:
-    child_thread = TimeoutRetryThread(
-      RunOnTimeoutThread, timeout,
-      name='TimeoutThread-%d-for-%s' % (num_try,
-                                        threading.current_thread().name))
-    try:
-      thread_group = reraiser_thread.ReraiserThreadGroup([child_thread])
-      thread_group.StartAll()
-      thread_group.JoinAll(child_thread.GetWatcher())
-      return ret[0]
-    except:
-      child_thread.LogTimeoutException()
-      if num_try > retries:
-        raise
-      num_try += 1
+from devil.utils.timeout_retry import *