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 psutil
   8 import re
   9 import win32gui
  10 import win32process
  11
  12
  13 def GetProcessIDAndPathPairs():
  14   """Returns a list of 2-tuples of (process id, process path).
  15   """
  16   process_id_and_path_pairs = []
  17   for process in psutil.process_iter():
  18     try:
  19       process_id_and_path_pairs.append((process.pid, process.exe))
  20     except psutil.Error:
  21       # It's normal that some processes are not accessible.
  22       pass
  23   return process_id_and_path_pairs
  24
  25
  26 def GetProcessIDs(process_path):
  27   """Returns a list of IDs of processes whose path is |process_path|.
  28
  29   Args:
  30     process_path: The path to the process.
  31
  32   Returns:
  33     A list of process IDs.
  34   """
  35   return [pid for (pid, path) in GetProcessIDAndPathPairs() if
  36           path == process_path]
  37
  38
  39 def GetWindowHandles(process_ids):
  40   """Returns a list of handles of windows owned by processes in |process_ids|.
  41
  42   Args:
  43     process_ids: A list of process IDs.
  44
  45   Returns:
  46     A list of handles of windows owned by processes in |process_ids|.
  47   """
  48   hwnds = []
  49   def EnumerateWindowCallback(hwnd, _):
  50     _, found_process_id = win32process.GetWindowThreadProcessId(hwnd)
  51     if found_process_id in process_ids and win32gui.IsWindowVisible(hwnd):
  52       hwnds.append(hwnd)
  53   # Enumerate all the top-level windows and call the callback with the hwnd as
  54   # the first parameter.
  55   win32gui.EnumWindows(EnumerateWindowCallback, None)
  56   return hwnds
  57
  58
  59 def WindowExists(process_ids, class_pattern):
  60   """Returns whether there exists a window with the specified criteria.
  61
  62   This method returns whether there exists a window that is owned by a process
  63   in |process_ids| and has a class name that matches |class_pattern|.
  64
  65   Args:
  66     process_ids: A list of process IDs.
  67     class_pattern: The regular expression pattern of the window class name.
  68
  69   Returns:
  70     A boolean indicating whether such window exists.
  71   """
  72   for hwnd in GetWindowHandles(process_ids):
  73     if re.match(class_pattern, win32gui.GetClassName(hwnd)):
  74       return True
  75   return False