--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/dreamtime.py Sun Jan 28 11:04:52 2018 +0000
@@ -0,0 +1,212 @@
+#
+# Wake/sleep detection for scheduling adjustments
+#
+
+import Foundation
+import AppKit
+import platform
+import time
+import threading
+import weakref
+import datetime
+import borgend
+
+logger=borgend.logger.getChild(__name__)
+
+_dreamtime_monitor=None
+
+#
+# Support classes for dealing with different times
+#
+
+# Return difference (delay) of "dreamtime" to monotonic time
+def dreamtime_difference():
+ if _dreamtime_monitor:
+ return _dreamtime_monitor.diff()
+ else:
+ return time.monotonic()
+
+# Return "dreamtime"
+def dreamtime():
+ return max(0, time.monotonic()-dreamtime_difference())
+
+class Time:
+ def realtime(self):
+ raise NotImplementedError
+
+ def monotonic(self):
+ raise NotImplementedError
+
+ @staticmethod
+ def _now():
+ raise NotImplementedError
+
+ @classmethod
+ def now(cls):
+ return cls(cls._now())
+
+ @classmethod
+ def from_realtime(cls, realtime):
+ return cls(realtime-time.time()+cls._now())
+
+ @classmethod
+ def from_monotonic(cls, monotonic):
+ return cls(monotonic-time.monotonic()+cls._now())
+
+ @classmethod
+ def after(cls, seconds):
+ return cls(cls._now()+seconds)
+
+ def datetime(self):
+ return datetime.datetime.fromtimestamp(self.realtime())
+
+ def seconds_to(self):
+ return self._value-self._now()
+
+ def __lt__(self, other):
+ return self.monotonic() < other.monotonic()
+
+ def __gt__(self, other):
+ return self.monotonic() > other.monotonic()
+
+ def __le__(self, other):
+ return self.monotonic() <= other.monotonic()
+
+ def __ge__(self, other):
+ return self.monotonic() >= other.monotonic()
+
+ def __eq__(self, other):
+ return self.monotonic() == other.realtime()
+
+class RealTime(Time):
+ def __init__(self, when):
+ self._value=when
+
+ def realtime(self):
+ return self._value
+
+ def monotonic(self):
+ return self._value+(time.monotonic()-time.time())
+
+ @staticmethod
+ def _now():
+ return time.time()
+
+class MonotonicTime(Time):
+ def __init__(self, when):
+ self._value=when
+
+ def realtime(self):
+ return self._value+(time.time()-time.monotonic())
+
+ def monotonic(self):
+ return self._value
+
+ @staticmethod
+ def _now():
+ return time.monotonic()
+
+class DreamTime(Time):
+ def __init__(self, when):
+ self._value=when
+
+ def realtime(self):
+ return self._value+(time.time()-dreamtime())
+
+ # Important: monotonic is "static" within a wakeup period
+ # and does not need to call time.monotonic(), as it gets compared
+ # to a specific time.monotonic() realisation
+ def monotonic(self):
+ return self._value+dreamtime_difference()
+
+ @staticmethod
+ def _now():
+ return dreamtime()
+
+#
+# Wake up / sleep handling
+#
+
+class SleepHandler(Foundation.NSObject):
+ """ Handle wake/sleep notifications """
+
+ def init(self):
+ self.__sleeptime=None
+ self.__slept=0
+ self.__epoch=time.monotonic()
+ self.__lock=threading.Lock()
+ self.__callbacks=weakref.WeakKeyDictionary()
+
+ return self
+
+ def handleSleepNotification_(self, aNotification):
+ logger.info("System going to sleep")
+ now=time.monotonic()
+ with self.__lock:
+ self.__sleeptime=now
+
+ def handleWakeNotification_(self, aNotification):
+ logger.info("System waking up from sleep")
+ try:
+ now=time.monotonic()
+ with self.__lock:
+ if self.__sleeptime:
+ slept=max(0, now-self.__sleeptime)
+ logger.info("Slept %f seconds" % slept)
+ self.__slept=self.__slept+slept
+ self.__sleeptime=None
+ callbacks=self.__callbacks.copy()
+ except:
+ logger.exception("Bug in wakeup handler")
+
+ for callback in callbacks.values():
+ try:
+ callback()
+ except Exception:
+ logger.exception("Error in wake notification callback")
+
+ # Return difference to time.monotonic()
+ def diff(self):
+ with self.__lock:
+ diff=self.__epoch+self.__slept
+ return diff
+
+ # Weirdo (Py)ObjC naming to stop it form choking up
+ def addForObj_aCallback_(self, obj, callback):
+ with self.__lock:
+ self.__callbacks[obj]=callback
+
+# obj is to use a a key in a weak key dictionary
+def add_callback(obj, callback):
+ global _dreamtime_monitor
+
+ monitor=_dreamtime_monitor
+ if not monitor:
+ raise Exception("Dreamtime monitor not started")
+ else:
+ monitor.addForObj_aCallback_(obj, callback)
+
+def start_monitoring():
+ global _dreamtime_monitor
+
+ if platform.system()=='Darwin':
+ logger.debug("Starting to monitor system sleep")
+ workspace = AppKit.NSWorkspace.sharedWorkspace()
+ notification_center = workspace.notificationCenter()
+ _dreamtime_monitor = SleepHandler.new()
+
+ notification_center.addObserver_selector_name_object_(
+ _dreamtime_monitor,
+ "handleSleepNotification:",
+ AppKit.NSWorkspaceWillSleepNotification,
+ None)
+
+ notification_center.addObserver_selector_name_object_(
+ _dreamtime_monitor,
+ "handleWakeNotification:",
+ AppKit.NSWorkspaceDidWakeNotification,
+ None)
+ else:
+ logger.warning(("No system sleep monitor implemented for '%s'"
+ % platform.system()))
+