statemachine.py

   1 from libtuer import ThreadFunction, logger, fire_and_forget
   2 from actor import Actor
   3 import os, random
   4
   5 # logger.{debug,info,warning,error,critical}
   6
   7 def play_sound (what):
   8         try:
   9                 soundfiles = os.listdir(SOUNDS_DIRECTORY+what)
  10         except FileNotFoundError:
  11                 logger.error("StateMachine: Unable to list sound files in %s" % (SOUNDS_DIRECTORY+what))
  12                 return
  13         soundfile = SOUNDS_DIRECTORY + what + '/' + random.choice(soundfiles)
  14         fire_and_forget ([SOUNDS_PLAYER,soundfile], logger.error, "StateMachine: ")
  15
  16
  17 # StateOpening constants
  18 OPEN_REPEAT_TIMEOUT = 8
  19 OPEN_REPEAT_NUMBER = 3
  20
  21 # StateAboutToOpen constants
  22 ABOUTOPEN_NERVLIST = [(5, lambda : play_sound("flipswitch")), (10, lambda:play_sound("flipswitch")), (10, lambda:Logger.warning("Space open but switch not flipped for 10 seconds")),\
  23         (20, lambda:play_sound("flipswitch")), (30, lambda:play_sound("flipswitch")), (30, lambda:Logger.error("Space open but switch not flipped for 30 seconds")),\
  24         (40, lambda:play_sound("flipswitch")), (50, lambda:play_sound("flipswitch")), (56, lambda:play_sound("flipswitch")), (60, lambda:Logger.critical("Space open but switch not flipped for 60 seconds"))]
  25
  26 # play_sound constants
  27 SOUNDS_DIRECTORY = "/opt/tuer/sounds/"
  28 SOUNDS_PLAYER = "/usr/bin/mplayer"
  29
  30
  31 class StateMachine():
  32         # commands you can send
  33         CMD_PINS = 0
  34         CMD_BUZZ = 1
  35         CMD_OPEN = 2
  36         CMD_WAKEUP = 3
  37         CMD_LAST = 4
  38
  39         class State():
  40                 def __init__(self, state_machine):
  41                         self.state_machine = state_machine
  42                         self.time_entered = time.time()
  43                         self.theDict = None
  44                 def handle_pins_event(self):
  45                         pass # one needn't implement this
  46                 def handle_buzz_event(self,arg): # this shouldn't be overwritten
  47                         self.actor.act(Actor.CMD_BUZZ)
  48                         arg("200 okay: buzz executed")
  49                 def handle_open_event(self,arg):
  50                         if arg is not None:
  51                                 arg("412 Precondition Failed: The current state (%s) cannot handle the OPEN event" % self.__class__.__name__)
  52                 def handle_wakeup_event(self):
  53                         pass # one needn't implement this
  54                 def pins(self):
  55                         return self.state_machine.pins
  56                 def actor(self):
  57                         return self.state_machine.actor
  58                 def handle_event(self,ev,arg):
  59                         if arg is CMD_PINS:
  60                                 self.handle_pins_event()
  61                         elif arg is CMD_BUZZ:
  62                                 self.handle_buzz_event(arg)
  63                         elif arg is CMD_OPEN:
  64                                 self.handle_open_event(arg)
  65                         elif arg is CMD_WAKEUP:
  66                                 self.handle_wakeup_event()
  67                         else:
  68                                 raise Exception("Unknown command number: %d" % ev)
  69
  70         class StateStart(State):
  71                 def __init__(self, sm):
  72                         State.__init__(self,sm)
  73                 def handle_pins_event(self):
  74                         thepins = self.pins()
  75                         for pin in thepins:
  76                                 if pin is None:
  77                                         return None
  78                         if thepins.door_locked:
  79                                 return StateZu
  80                         else:
  81                                 return StateAuf
  82
  83         class StateZu(State):
  84                 def __init__(self,sm):
  85                         State.__init__(self,sm)
  86                 def handle_pins_event(self):
  87                         pins = self.pins()
  88                         if not pins.door_locked:
  89                                 return StateAboutToOpen(self.state_machine)
  90                 def handle_open_event(self,callback):
  91                         return StateOpening(callback,self.state_machine)
  92
  93         class StateOpening(State):
  94                 def __init__(self,callback,sm):
  95                         State.__init__(self,sm)
  96                         self.callbacks=[callback]
  97                         self.tries = 0
  98                         self.actor().act(Actor.CMD_OPEN)
  99                 def notify(self, did_it_work):
 100                         s = "200 okay: door open" if did_it_work else ("500 internal server error: Couldn't open door with %d tries à %f seconds" % (OPEN_REPEAT_NUMBER,OPEN_REPEAT_TIMEOUT))
 101                         for cb in self.callbacks:
 102                                 if cb is not None:
 103                                         cb(s)
 104                 def handle_pins_event(self):
 105                         pins = self.pins()
 106                         if not pins.door_locked:
 107                                 self.notify(True)
 108                                 return StateAboutToOpen(self.state_machine)
 109                 def handle_open_event(self,callback):
 110                         self.callbacks.append(callback)
 111                 def handle_wakeup_event(self):
 112                         over = time.time() - self.time_entered
 113                         nexttry = (self.tries+1) * OPEN_REPEAT_TIMEOUT
 114                         if over > nexttry:
 115                                 if self.tries < OPEN_REPEAT_NUMBER:
 116                                         self.actor().act(Actor.CMD_OPEN)
 117                                         self.tries += 1
 118                                 else:
 119                                         #TODO: LOG ERROR und EMAIL an Admins
 120                                         self.notify(False)
 121                                         return StateZu(self.state_machine)
 122
 123         class StateAboutToOpen(State):
 124                 def __init__(self, sm):
 125                         State.__init__(sm)
 126                 def handle_pins_event(self):
 127                         pins = self.pins()
 128                         if pins.door_locked:
 129                                 return StateZu(self.state_machine)
 130                         elif pins.space_active:
 131                                 return StateAuf(self.state_machine)
 132                         else:
 133                                 over = time.time() - self.time_entered
 134                                 # TODO: Nerv
 135                                 logger.debug("AboutToOpen since %f seconds. TODO: nerv the user" % over)
 136                 # TODO
 137
 138         class StateAuf(State):
 139                 #TODO
 140                 pass
 141
 142         class StateClosing(State):
 143                 #TODO
 144                 pass
 145
 146         class StateAboutToLeave(State):
 147                 #TODO
 148                 pass
 149
 150         class StateLeaving(State):
 151                 #TODO
 152                 pass
 153
 154         def __init__(self, actor):
 155                 self.actor = actor
 156                 self.callback = ThreadFunction(self._callback)
 157                 self.current_state = None
 158                 self.pins = None
 159
 160         def stop (self):
 161                 self.callback.stop()
 162
 163         def _callback(self, cmd, arg=None):
 164                 # update pins
 165                 if cmd == StateMachine.CMD_PINS:
 166                         self.pins = arg
 167                 # handle stuff
 168                 newstate = self.current_state.handle_event(cmd,arg) # returns None or an instance of the new state
 169                 while newstate is not None:
 170                         logger.info("StateMachine: new state = %s" % newstate.__class__.__name__)
 171                         self.current_state = newstate
 172                         newstate = self.current_state.handle_event(StateMachine.CMD_PINS, self.pins)