spaceapi.py

   1 from threading import Lock
   2 from libtuer import ThreadFunction, logger
   3 import urllib.request, time
   4
   5 from config import spaceApiKey
   6
   7 RETRY_TIME = 30
   8 HEARTBEAT_TIME = 10*60
   9
  10 class SpaceApi:
  11         def __init__ (self, waker):
  12                 self._local_state = None
  13                 self._remote_state = None
  14                 self._last_set_at = 0
  15                 self._running = True
  16                 self.set_state = ThreadFunction(self._set_state, "Space API")
  17                 waker.register(self.set_state, RETRY_TIME)
  18
  19         def stop (self):
  20                 self.set_state.stop()
  21
  22         def _do_request(self, state):
  23                 state_val = 1 if state else 0
  24                 try:
  25                         logger.info("Setting SpaceAPI to %d" % state_val)
  26                         url = "https://spaceapi.hacksaar.de/status.php?action=update&key=%s&status=%d" % (spaceApiKey, state_val)
  27                         response = urllib.request.urlopen(url, timeout=5.0)
  28                         responseText = response.read().decode('utf-8').strip()
  29                         if response.getcode() == 200 and responseText == "UpdateSuccessful": return True
  30                         logger.error("SpaceAPI returned unexpected code %d, content %s" % (response.getcode(), responseText))
  31                         return False
  32                 except urllib.request.URLError as e:
  33                         logger.error("SpaceAPI update returned error: %s" % str(e))
  34                         return False
  35
  36         # set_state is the asynchronous version of _set_state (see __init__)
  37         def _set_state (self, state = None):
  38                 '''Sets the state, if None: leave state unchanged and re-try if previous attempts failed'''
  39                 if state is not None:
  40                         self._local_state = state
  41                 # check if there's something we need to do: There's a valid state, and either the state has changed or
  42                 # we need to refresh our heartbeta)
  43                 now = time.time()
  44                 if self._local_state is not None and (self._local_state != self._remote_state or now > self._last_set_at+HEARTBEAT_TIME):
  45                         # take action!
  46                         success = self._do_request(self._local_state)
  47                         # TODO error too often -> log critical to send mails
  48                         if success:
  49                                 self._remote_state = self._local_state
  50                                 self._last_set_at = now