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1 # Copyright 2014 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 import json | |
6 import os | |
7 import threading | |
8 | |
9 from pylib import constants | |
10 _BLACKLIST_JSON = os.path.join( | |
11 constants.DIR_SOURCE_ROOT, | |
12 os.environ.get('CHROMIUM_OUT_DIR', 'out'), | |
13 'bad_devices.json') | |
14 | |
15 # Note that this only protects against concurrent accesses to the blacklist | |
16 # within a process. | |
17 _blacklist_lock = threading.RLock() | |
18 | |
19 def ReadBlacklist(): | |
20 """Reads the blacklist from the _BLACKLIST_JSON file. | |
21 | |
22 Returns: | |
23 A list containing bad devices. | |
24 """ | |
25 with _blacklist_lock: | |
26 if not os.path.exists(_BLACKLIST_JSON): | |
27 return [] | |
28 | |
29 with open(_BLACKLIST_JSON, 'r') as f: | |
30 return json.load(f) | |
31 | |
32 | |
33 def WriteBlacklist(blacklist): | |
34 """Writes the provided blacklist to the _BLACKLIST_JSON file. | |
35 | |
36 Args: | |
37 blacklist: list of bad devices to write to the _BLACKLIST_JSON file. | |
38 """ | |
39 with _blacklist_lock: | |
40 with open(_BLACKLIST_JSON, 'w') as f: | |
41 json.dump(list(set(blacklist)), f) | |
42 | |
43 | |
44 def ExtendBlacklist(devices): | |
45 """Adds devices to _BLACKLIST_JSON file. | |
46 | |
47 Args: | |
48 devices: list of bad devices to be added to the _BLACKLIST_JSON file. | |
49 """ | |
50 with _blacklist_lock: | |
51 blacklist = ReadBlacklist() | |
52 blacklist.extend(devices) | |
53 WriteBlacklist(blacklist) | |
54 | |
55 | |
56 def ResetBlacklist(): | |
57 """Erases the _BLACKLIST_JSON file if it exists.""" | |
58 with _blacklist_lock: | |
59 if os.path.exists(_BLACKLIST_JSON): | |
60 os.remove(_BLACKLIST_JSON) | |
61 | |
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