chrome/test/mini_installer/chrome_helper.py

   1 # Copyright 2013 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5 """Common helper module for working with Chrome's processes and windows."""
   6
   7 import ctypes
   8 import pywintypes
   9 import re
  10 import win32con
  11 import win32gui
  12 import win32process
  13
  14
  15 def GetProcessIDAndPathPairs():
  16   """Returns a list of 2-tuples of (process id, process path).
  17
  18   This is needed because psutil is not available on Windows slave machines (see:
  19   http://crbug.com/257696).
  20   TODO(sukolsak): Use psutil.process_iter() once it becomes available.
  21   """
  22   process_id_and_path_pairs = []
  23   for process_id in win32process.EnumProcesses():
  24     process_handle = ctypes.windll.kernel32.OpenProcess(
  25         win32con.PROCESS_QUERY_INFORMATION | win32con.PROCESS_VM_READ, False,
  26         process_id)
  27     if not process_handle:
  28       continue
  29     try:
  30       process_path = win32process.GetModuleFileNameEx(process_handle, 0)
  31       process_id_and_path_pairs.append((process_id, process_path))
  32     except pywintypes.error:
  33       # It's normal that some processes are not accessible.
  34       pass
  35   return process_id_and_path_pairs
  36
  37
  38 def GetProcessIDs(process_path):
  39   """Returns a list of IDs of processes whose path is |process_path|.
  40
  41   Args:
  42     process_path: The path to the process.
  43
  44   Returns:
  45     A list of process IDs.
  46   """
  47   return [pid for (pid, path) in GetProcessIDAndPathPairs() if
  48           path == process_path]
  49
  50
  51 def GetWindowHandles(process_ids):
  52   """Returns a list of handles of windows owned by processes in |process_ids|.
  53
  54   Args:
  55     process_ids: A list of process IDs.
  56
  57   Returns:
  58     A list of handles of windows owned by processes in |process_ids|.
  59   """
  60   hwnds = []
  61   def EnumerateWindowCallback(hwnd, _):
  62     _, found_process_id = win32process.GetWindowThreadProcessId(hwnd)
  63     if found_process_id in process_ids and win32gui.IsWindowVisible(hwnd):
  64       hwnds.append(hwnd)
  65   # Enumerate all the top-level windows and call the callback with the hwnd as
  66   # the first parameter.
  67   win32gui.EnumWindows(EnumerateWindowCallback, None)
  68   return hwnds
  69
  70
  71 def WindowExists(process_ids, class_pattern):
  72   """Returns whether there exists a window with the specified criteria.
  73
  74   This method returns whether there exists a window that is owned by a process
  75   in |process_ids| and has a class name that matches |class_pattern|.
  76
  77   Args:
  78     process_ids: A list of process IDs.
  79     class_pattern: The regular expression pattern of the window class name.
  80
  81   Returns:
  82     A boolean indicating whether such window exists.
  83   """
  84   for hwnd in GetWindowHandles(process_ids):
  85     if re.match(class_pattern, win32gui.GetClassName(hwnd)):
  86       return True
  87   return False