81b6b87ef3f8c5c250e1b771750fa5cf50e0e94c
[saartuer.git] / 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 # StateAuf constants
27 #  time that must pass between two bell_ringing events to buzz the door again (seconds)
28 AUF_BELLBUZZ_REPEAT_TIME = 2
29
30 # play_sound constants
31 SOUNDS_DIRECTORY = "/opt/tuer/sounds/"
32 SOUNDS_PLAYER = "/usr/bin/mplayer"
33
34
35 class StateMachine():
36         # commands you can send
37         CMD_PINS = 0
38         CMD_BUZZ = 1
39         CMD_OPEN = 2
40         CMD_WAKEUP = 3
41         CMD_LAST = 4
42         
43         class State():
44                 def __init__(self, state_machine):
45                         self.state_machine = state_machine
46                         self.time_entered = time.time()
47                         self.theDict = None
48                         self.last_wakeup = self.time_entered
49                 def handle_pins_event(self):
50                         pass # one needn't implement this
51                 def handle_buzz_event(self,arg): # this shouldn't be overwritten
52                         self.actor.act(Actor.CMD_BUZZ)
53                         arg("200 okay: buzz executed")
54                 def handle_open_event(self,arg):
55                         if arg is not None:
56                                 arg("412 Precondition Failed: The current state (%s) cannot handle the OPEN event" % self.__class__.__name__)
57                 def handle_wakeup_event(self):
58                         self.last_wakeup = time.time()
59                 def pins(self):
60                         return self.state_machine.pins
61                 def actor(self):
62                         return self.state_machine.actor
63                 def handle_event(self,ev,arg): # don't override
64                         if arg is CMD_PINS:
65                                 self.handle_pins_event()
66                         elif arg is CMD_BUZZ:
67                                 self.handle_buzz_event(arg)
68                         elif arg is CMD_OPEN:
69                                 self.handle_open_event(arg)
70                         elif arg is CMD_WAKEUP:
71                                 self.handle_wakeup_event()
72                         else:
73                                 raise Exception("Unknown command number: %d" % ev)
74         
75         class StateStart(State):
76                 def handle_pins_event(self):
77                         thepins = self.pins()
78                         for pin in thepins:
79                                 if pin is None:
80                                         return None
81                         if thepins.door_locked:
82                                 return StateZu
83                         else:
84                                 return StateAuf
85
86         class StateZu(State):
87                 def handle_pins_event(self):
88                         pins = self.pins()
89                         if not pins.door_locked:
90                                 return StateAboutToOpen(self.state_machine)
91                 def handle_open_event(self,callback):
92                         return StateOpening(callback,self.state_machine)
93         
94         class StateOpening(State):
95                 def __init__(self,callback,sm):
96                         super().__init__(self,sm)
97                         self.callbacks=[callback]
98                         # FIXME: can we send "202 processing: Trying to open the door" here? Are the callbacks multi-use?
99                         self.tries = 0
100                         self.actor().act(Actor.CMD_OPEN)
101                 def notify(self, did_it_work):
102                         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))
103                         for cb in self.callbacks:
104                                 if cb is not None:
105                                         cb(s)
106                 def handle_pins_event(self):
107                         pins = self.pins()
108                         if not pins.door_locked:
109                                 self.notify(True)
110                                 return StateAboutToOpen(self.state_machine)
111                 def handle_open_event(self,callback):
112                         # FIXME: 202 notification also here if possible
113                         self.callbacks.append(callback)
114                 def handle_wakeup_event(self):
115                         over = time.time() - self.time_entered
116                         nexttry = (self.tries+1) * OPEN_REPEAT_TIMEOUT
117                         if over > nexttry:
118                                 if self.tries < OPEN_REPEAT_NUMBER:
119                                         self.actor().act(Actor.CMD_OPEN)
120                                         self.tries += 1
121                                 else:
122                                         logger.critical("Couldn't open door after %d tries. Going back to StateZu." % OPEN_REPEAT_NUMBER)
123                                         self.notify(False)
124                                         return StateZu(self.state_machine)
125         
126         class AbstractStateWhereOpeningIsRedundant(State):
127                 def handle_open_event(self, callback):
128                         # FIXME contradicting original plan where open would be ignored in StateAboutToOpen?
129                         callback("299 redundant: Space seems to be already open. Still processing your request tough.")
130                         logger.warning("Received OPEN command in StateAboutToOpen. This should not be necessary.")
131                         self.actor().act(Actor.CMD_OPEN)
132         
133         class StateAboutToOpen(AbstractStateWhereOpeningIsRedundant):
134                 def handle_pins_event(self):
135                         pins = self.pins()
136                         if pins.door_locked:
137                                 return StateZu(self.state_machine)
138                         elif pins.space_active:
139                                 return StateAuf(self.state_machine)
140                 def handle_wakeup_event(self):
141                         now = time.time()
142                         lasttime = self.last_wakeup - self.time_entered
143                         thistime = now - self.time_entered
144                         for (t,f) in filter(lambda (t,f): t<=thistime and t>lasttime, ABOUTOPEN_NERVLIST):
145                                 ret = f();
146                                 if ret is not None:
147                                         return ret
148         
149         class StateAuf(AbstractStateWhereOpeningIsRedundant):
150                 def __init__(self,sm):
151                         super().__init__(sm)
152                         self.last_buzzed = None
153                 def handle_pins_event(self):
154                         pins = self.pins()
155                         if pins.bell_ringing:
156                                 now = time.time()
157                                 if self.last_buzzed is None or now-self.last_buzzed < AUF_BELLBUZZ_REPEAT_TIME:
158                                         logger.info("buzzing because of bell ringing in state auf")
159                                         self.actor().act(Actor.CMD_BUZZ)
160                                         self.last_buzzed = now
161                         if not pins.space_active:
162                                 logger.info("space switch off - starting leaving procedure")
163                                 return StateAboutToLeave(self.state_machine)
164                         if pins.door_locked:
165                                 logger.error("door manually locked, but space switch on - going to StateZu")
166                                 play_sound("manual_lock")
167                                 return StateZu(self.state_machine)
168                 # handle_wakeup_event intentionally not overwritten
169         
170         class StateClosing(State):
171                 #TODO Ralf/Conny
172                 pass
173         
174         class StateAboutToLeave(State):
175                 #TODO Ralf
176                 pass
177         
178         class StateLeaving(State):
179                 #TODO Ralf
180                 pass
181         
182         def __init__(self, actor):
183                 self.actor = actor
184                 self.callback = ThreadFunction(self._callback)
185                 self.current_state = StateStart(self)
186                 self.pins = None
187                 self.old_pins = None
188         
189         def stop (self):
190                 self.callback.stop()
191         
192         def _callback(self, cmd, arg=None):
193                 # update pins
194                 if cmd == StateMachine.CMD_PINS:
195                         self.pins = arg
196                 # handle stuff
197                 newstate = self.current_state.handle_event(cmd,arg) # returns None or an instance of the new state
198                 self.old_pins = self.pins # FIXME not used?
199                 while newstate is not None:
200                         logger.info("StateMachine: new state = %s" % newstate.__class__.__name__)
201                         self.current_state = newstate
202                         newstate = self.current_state.handle_event(StateMachine.CMD_PINS, self.pins)