git.maemo.org Git - theonering/blob - src/gvoice/state_machine.py

   1 #!/usr/bin/env python
   2
   3 import logging
   4
   5 import util.go_utils as gobject_utils
   6 import util.coroutines as coroutines
   7 import util.misc as misc_utils
   8
   9
  10 _moduleLogger = logging.getLogger("gvoice.state_machine")
  11
  12
  13 def to_milliseconds(**kwd):
  14         if "milliseconds" in kwd:
  15                 return kwd["milliseconds"]
  16         elif "seconds" in kwd:
  17                 return kwd["seconds"] * 1000
  18         elif "minutes" in kwd:
  19                 return kwd["minutes"] * 1000 * 60
  20         elif "hours" in kwd:
  21                 return kwd["hours"] * 1000 * 60 * 60
  22         raise KeyError("Unknown arg: %r" % kwd)
  23
  24
  25 def to_seconds(**kwd):
  26         if "milliseconds" in kwd:
  27                 return kwd["milliseconds"] / 1000
  28         elif "seconds" in kwd:
  29                 return kwd["seconds"]
  30         elif "minutes" in kwd:
  31                 return kwd["minutes"] * 60
  32         elif "hours" in kwd:
  33                 return kwd["hours"] * 60 * 60
  34         raise KeyError("Unknown arg: %r" % kwd)
  35
  36
  37 class NopStateStrategy(object):
  38
  39         def __init__(self):
  40                 pass
  41
  42         def initialize_state(self):
  43                 pass
  44
  45         def reinitialize_state(self):
  46                 pass
  47
  48         def increment_state(self):
  49                 pass
  50
  51         @property
  52         def timeout(self):
  53                 return UpdateStateMachine.INFINITE_PERIOD
  54
  55         def __repr__(self):
  56                 return "NopStateStrategy()"
  57
  58
  59 class ConstantStateStrategy(object):
  60
  61         def __init__(self, timeout):
  62                 assert 0 < timeout or timeout == UpdateStateMachine.INFINITE_PERIOD
  63                 self._timeout = timeout
  64
  65         def initialize_state(self):
  66                 pass
  67
  68         def reinitialize_state(self):
  69                 pass
  70
  71         def increment_state(self):
  72                 pass
  73
  74         @property
  75         def timeout(self):
  76                 return self._timeout
  77
  78         def __repr__(self):
  79                 return "ConstantStateStrategy(timeout=%r)" % self._timeout
  80
  81
  82 class NTimesStateStrategy(object):
  83
  84         def __init__(self, timeouts, postTimeout):
  85                 assert 0 < len(timeouts)
  86                 for timeout in timeouts:
  87                         assert 0 < timeout or timeout == UpdateStateMachine.INFINITE_PERIOD
  88                 assert 0 < postTimeout or postTimeout == UpdateStateMachine.INFINITE_PERIOD
  89                 self._timeouts = timeouts
  90                 self._postTimeout = postTimeout
  91
  92                 self._attemptCount = 0
  93
  94         def initialize_state(self):
  95                 self._attemptCount = len(self._timeouts)
  96
  97         def reinitialize_state(self):
  98                 self._attemptCount = 0
  99
 100         def increment_state(self):
 101                 self._attemptCount += 1
 102
 103         @property
 104         def timeout(self):
 105                 try:
 106                         return self._timeouts[self._attemptCount]
 107                 except IndexError:
 108                         return self._postTimeout
 109
 110         def __str__(self):
 111                 return "NTimesStateStrategy(timeout=%r)" % (
 112                         self.timeout,
 113                 )
 114
 115         def __repr__(self):
 116                 return "NTimesStateStrategy(timeouts=%r, postTimeout=%r)" % (
 117                         self._timeouts,
 118                         self._postTimeout,
 119                 )
 120
 121
 122 class GeometricStateStrategy(object):
 123
 124         def __init__(self, init, min, max):
 125                 assert 0 < init and init < max or init == UpdateStateMachine.INFINITE_PERIOD
 126                 assert 0 < min or min == UpdateStateMachine.INFINITE_PERIOD
 127                 assert min < max or max == UpdateStateMachine.INFINITE_PERIOD
 128                 self._min = min
 129                 self._max = max
 130                 self._init = init
 131                 self._current = 0
 132
 133         def initialize_state(self):
 134                 self._current = self._max
 135
 136         def reinitialize_state(self):
 137                 self._current = self._min
 138
 139         def increment_state(self):
 140                 if self._current == UpdateStateMachine.INFINITE_PERIOD:
 141                         pass
 142                 if self._init == UpdateStateMachine.INFINITE_PERIOD:
 143                         self._current = UpdateStateMachine.INFINITE_PERIOD
 144                 elif self._max == UpdateStateMachine.INFINITE_PERIOD:
 145                         self._current *= 2
 146                 else:
 147                         self._current = min(2 * self._current, self._max - self._init)
 148
 149         @property
 150         def timeout(self):
 151                 if UpdateStateMachine.INFINITE_PERIOD in (self._init, self._current):
 152                         timeout = UpdateStateMachine.INFINITE_PERIOD
 153                 else:
 154                         timeout = self._init + self._current
 155                 return timeout
 156
 157         def __str__(self):
 158                 return "GeometricStateStrategy(timeout=%r)" % (
 159                         self.timeout
 160                 )
 161
 162         def __repr__(self):
 163                 return "GeometricStateStrategy(init=%r, min=%r, max=%r)" % (
 164                         self._init, self._min, self._max
 165                 )
 166
 167
 168 class StateMachine(object):
 169
 170         STATE_ACTIVE = 0, "active"
 171         STATE_IDLE = 1, "idle"
 172         STATE_DND = 2, "dnd"
 173
 174         def start(self):
 175                 raise NotImplementedError("Abstract")
 176
 177         def stop(self):
 178                 raise NotImplementedError("Abstract")
 179
 180         def close(self):
 181                 raise NotImplementedError("Abstract")
 182
 183         def set_state(self, state):
 184                 raise NotImplementedError("Abstract")
 185
 186         @property
 187         def state(self):
 188                 raise NotImplementedError("Abstract")
 189
 190
 191 class MasterStateMachine(StateMachine):
 192
 193         def __init__(self):
 194                 self._machines = []
 195                 self._state = self.STATE_ACTIVE
 196
 197         def append_machine(self, machine):
 198                 self._machines.append(machine)
 199
 200         def start(self):
 201                 # Confirm we are all on the same page
 202                 for machine in self._machines:
 203                         machine.set_state(self._state)
 204                 for machine in self._machines:
 205                         machine.start()
 206
 207         def stop(self):
 208                 for machine in self._machines:
 209                         machine.stop()
 210
 211         def close(self):
 212                 for machine in self._machines:
 213                         machine.close()
 214
 215         def set_state(self, state):
 216                 self._state = state
 217                 for machine in self._machines:
 218                         machine.set_state(state)
 219
 220         @property
 221         def state(self):
 222                 return self._state
 223
 224
 225 class UpdateStateMachine(StateMachine):
 226         # Making sure the it is initialized is finicky, be careful
 227
 228         INFINITE_PERIOD = -1
 229         DEFAULT_MAX_TIMEOUT = to_seconds(hours=24)
 230
 231         _IS_DAEMON = True
 232
 233         def __init__(self, updateItems, name="", maxTime = DEFAULT_MAX_TIMEOUT):
 234                 self._name = name
 235                 self._updateItems = updateItems
 236                 self._maxTime = maxTime
 237                 self._isRunning = False
 238
 239                 self._state = self.STATE_ACTIVE
 240                 self._onTimeout = gobject_utils.Timeout(self._on_timeout)
 241
 242                 self._strategies = {}
 243                 self._callback = coroutines.func_sink(
 244                         coroutines.expand_positional(
 245                                 self._request_reset_timers
 246                         )
 247                 )
 248
 249         def __str__(self):
 250                 return """UpdateStateMachine(
 251         name=%r,
 252         strategie=%s,
 253         isRunning=%r,
 254 )""" % (self._name, self._strategy, self._onTimeout.is_running())
 255
 256         def __repr__(self):
 257                 return """UpdateStateMachine(
 258         name=%r,
 259         strategie=%r,
 260 )""" % (self._name, self._strategies)
 261
 262         def set_state_strategy(self, state, strategy):
 263                 self._strategies[state] = strategy
 264
 265         def start(self):
 266                 for strategy in self._strategies.itervalues():
 267                         strategy.initialize_state()
 268                 if self._strategy.timeout != self.INFINITE_PERIOD:
 269                         self._onTimeout.start(seconds=0)
 270                 self._isRunning = True
 271                 _moduleLogger.info("%s Starting State Machine" % (self._name, ))
 272
 273         def stop(self):
 274                 _moduleLogger.info("%s Stopping State Machine" % (self._name, ))
 275                 self._isRunning = False
 276                 self._onTimeout.cancel()
 277
 278         def close(self):
 279                 self._onTimeout.cancel()
 280                 self._callback = None
 281
 282         def set_state(self, newState):
 283                 if self._state == newState:
 284                         return
 285                 oldState = self._state
 286                 _moduleLogger.info("%s Transitioning from %s to %s" % (self._name, oldState, newState))
 287
 288                 self._state = newState
 289                 self._reset_timers(initialize=True)
 290
 291         @property
 292         def state(self):
 293                 return self._state
 294
 295         def reset_timers(self):
 296                 self._reset_timers()
 297
 298         @property
 299         def request_reset_timers(self):
 300                 return self._callback
 301
 302         @property
 303         def _strategy(self):
 304                 return self._strategies[self._state]
 305
 306         @property
 307         def maxTime(self):
 308                 return self._maxTime
 309
 310         @misc_utils.log_exception(_moduleLogger)
 311         def _request_reset_timers(self, *args):
 312                 self._reset_timers()
 313
 314         def _reset_timers(self, initialize=False):
 315                 if not self._isRunning:
 316                         return # not started yet
 317                 _moduleLogger.info("%s Resetting State Machine" % (self._name, ))
 318                 self._onTimeout.cancel()
 319                 if initialize:
 320                         self._strategy.initialize_state()
 321                 else:
 322                         self._strategy.reinitialize_state()
 323                 self._schedule_update()
 324
 325         def _schedule_update(self):
 326                 self._strategy.increment_state()
 327                 nextTimeout = self._strategy.timeout
 328                 if nextTimeout != self.INFINITE_PERIOD and nextTimeout < self._maxTime:
 329                         assert 0 < nextTimeout
 330                         self._onTimeout.start(seconds=nextTimeout)
 331                         _moduleLogger.info("%s Next update in %s seconds" % (self._name, nextTimeout, ))
 332                 else:
 333                         _moduleLogger.info("%s No further updates (timeout is %s seconds)" % (self._name, nextTimeout, ))
 334
 335         @misc_utils.log_exception(_moduleLogger)
 336         def _on_timeout(self):
 337                 self._schedule_update()
 338                 for item in self._updateItems:
 339                         try:
 340                                 item.update(force=True)
 341                         except Exception:
 342                                 _moduleLogger.exception("Update failed for %r" % item)