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 """A module to keep track of devices across builds.""" 6 7 import json 8 import logging 9 import os 10 11 12 def GetPersistentDeviceList(file_name): 13 """Returns a list of devices. 14 15 Args: 16 file_name: the file name containing a list of devices. 17 18 Returns: List of device serial numbers that were on the bot. 19 """ 20 if not os.path.isfile(file_name): 21 logging.warning('Device file %s doesn\'t exist.', file_name) 22 return [] 23 24 try: 25 with open(file_name) as f: 26 devices = json.load(f) 27 if not isinstance(devices, list) or not all(isinstance(d, basestring) 28 for d in devices): 29 logging.warning('Unrecognized device file format: %s', devices) 30 return [] 31 return [d for d in devices if d != '(error)'] 32 except ValueError: 33 logging.exception( 34 'Error reading device file %s. Falling back to old format.', file_name) 35 36 # TODO(bpastene) Remove support for old unstructured file format. 37 with open(file_name) as f: 38 return [d for d in f.read().splitlines() if d != '(error)'] 39 40 41 def WritePersistentDeviceList(file_name, device_list): 42 path = os.path.dirname(file_name) 43 assert isinstance(device_list, list) 44 # If there is a problem with ADB "(error)" can be added to the device list. 45 # These should be removed before saving. 46 device_list = [d for d in device_list if d != '(error)'] 47 if not os.path.exists(path): 48 os.makedirs(path) 49 with open(file_name, 'w') as f: 50 json.dump(device_list, f) 51
