build/android/host_heartbeat.py

   1 #!/usr/bin/env python
   2 #
   3 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
   4 # Use of this source code is governed by a BSD-style license that can be
   5 # found in the LICENSE file.
   6
   7 """Sends a heart beat pulse to the currently online Android devices.
   8 This heart beat lets the devices know that they are connected to a host.
   9 """
  10 # pylint: disable=W0702
  11
  12 import sys
  13 import time
  14
  15 from pylib.device import device_utils
  16
  17 PULSE_PERIOD = 20
  18
  19 def main():
  20   while True:
  21     try:
  22       devices = device_utils.DeviceUtils.HealthyDevices()
  23       for d in devices:
  24         d.RunShellCommand(['touch', '/sdcard/host_heartbeat'],
  25                           check_return=True)
  26     except:
  27       # Keep the heatbeat running bypassing all errors.
  28       pass
  29     time.sleep(PULSE_PERIOD)
  30
  31
  32 if __name__ == '__main__':
  33   sys.exit(main())