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
  11 import os
  12 import sys
  13 import time
  14
  15 from pylib import android_commands
  16
  17 PULSE_PERIOD = 20
  18
  19 def main():
  20   while True:
  21     try:
  22       devices = android_commands.GetAttachedDevices()
  23       for device in devices:
  24         android_cmd = android_commands.AndroidCommands(device)
  25         android_cmd.RunShellCommand('touch /sdcard/host_heartbeat')
  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())