adding files

my-emco-compact-5/watchdog.py

@@ -0,0 +1,93 @@
+#! /usr/bin/python
+import time
+import threading
+import sys
+
+class WatchDog():
+   def __init__(self, timeout):
+      self.timeout = timeout
+      self.last_ping_time = time.time()
+
+   def ping(self):
+      self.last_ping_time = time.time()
+
+   def check(self):
+      if time.time() - self.last_ping_time > self.timeout:
+         self.last_ping_time = time.time() #reset tick time
+         return True
+      else:
+         return False
+         
+   def insideMargin(self):
+      if time.time() - self.last_ping_time <= self.timeout:
+         return True
+      else:
+         self.last_ping_time = time.time() #reset tick time
+         return False
+
+
+class WatchDogDaemon(threading.Thread):
+   def __init__(self, timeout, periodicity, enable = True):
+      self.wd = WatchDog(timeout)
+      self.periodicity = periodicity
+      self.enabled = enable
+      self._start()
+
+   def _start(self):
+      threading.Thread.__init__(self)
+      self.daemon = True
+      self.start()
+
+   def ping(self):
+      self.wd.ping()
+
+   def run(self):
+      print("Starting watchdog deamon...")
+      while(self.enabled):
+         time.sleep(self.periodicity)
+
+         if not self.wd.insideMargin():
+            self.reset()
+
+      print("stopping watchdog deamon...")
+
+   def setEnabled(self, enabled):
+      if self.enabled == False and enabled == True:
+         self.enabled = True
+         self.wd.ping() # reset tick time
+         self._start()
+
+      if enabled == False:
+         self.enabled = False
+
+   def reset(self):
+      """to be overriden by client"""
+      pass
+
+
+def reset():
+   print('reset')
+
+def main():
+   i = 0
+   wdd = WatchDogDaemon(2, 0.5, False)
+   wdd.reset = reset
+   try:
+      while 1:
+         time.sleep(1)
+         print('main_' + str(i))
+         print(wdd.is_alive())
+         i = i+1
+
+         if i == 5 or i == 15:
+            wdd.setEnabled(True)
+         if i == 10:
+            wdd.setEnabled(False)
+
+         wdd.ping()
+
+   except KeyboardInterrupt:
+      raise SystemExit
+
+if __name__ == '__main__':
+   main()