Sun, 04 Feb 2018 01:27:38 +0000
Part 2 of handling macOS sleep/wake signal brokenness.
a) Added Time.horizon(), which indicates how far the Time event is from the
epoch, in monotonic time. For DreamTime, if the system is sleeping, this
returns ∞. b) The DreamTime monitor also signals sleep to callbacks, so
that the Scheduler can re-sort the events. The sorting is now done by
the horizon, so DreamTime events will be moved last and not activated when
the system is sleeping or "sleeping", but other events will be executed
normally if the system is merely "sleeping".
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1 | # |
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2 | # Borgend by Tuomo Valkonen, 2018 |
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3 | # |
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4 | # This file implements system wake/sleep detection for scheduling adjustments. |
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5 | # |
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6 | |
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7 | import platform |
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8 | import time |
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9 | import threading |
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10 | import weakref |
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11 | import datetime |
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12 | import logging |
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13 | import math |
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14 | |
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15 | logger=logging.getLogger(__name__) |
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16 | |
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DreamTime.monotonic() no longer needs to call time.monotonic()
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17 | _dreamtime_monitor=None |
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18 | |
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19 | # |
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20 | # Support classes for dealing with different times |
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21 | # |
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22 | |
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23 | # Time snapshotting to helps to create stable comparisons of different |
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24 | # subclasses of Time. |
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25 | class Snapshot: |
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26 | def __init__(self): |
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27 | self._monotonic=None |
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28 | self._realtime=None |
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29 | self._dreamtime=None |
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30 | self._sleeping=None |
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31 | |
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32 | def monotonic(self): |
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33 | if self._monotonic is None: |
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34 | self._monotonic=time.monotonic() |
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35 | return self._monotonic |
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36 | |
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37 | def realtime(self): |
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38 | if self._realtime is None: |
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39 | self._realtime=time.time() |
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40 | return self._realtime |
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41 | |
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42 | def dreamtime_sleeping(self): |
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43 | if self._dreamtime is None: |
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44 | if _dreamtime_monitor: |
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45 | self._dreamtime, self._sleeping=_dreamtime_monitor.dreamtime_sleeping(snapshot=self) |
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46 | else: |
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47 | self._dreamtime, self._sleeping=self.monotonic(), False |
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48 | return self._dreamtime, self._sleeping |
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49 | |
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50 | def dreamtime(self): |
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51 | time, _=self.dreamtime_sleeping() |
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52 | return time |
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53 | |
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54 | def sleeping(self): |
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55 | _, sleeping=self.dreamtime_sleeping() |
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56 | return sleeping |
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57 | |
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58 | # The main Time class, for time advancing in various paces |
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59 | class Time: |
97 | 60 | def __init__(self, when): |
61 | self._value=when | |
62 | ||
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63 | def _monotonic(self, snapshot): |
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64 | raise NotImplementedError |
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65 | |
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66 | def _realtime(self, snapshot): |
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67 | raise NotImplementedError |
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68 | |
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69 | @staticmethod |
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70 | def _now(snapshot): |
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71 | raise NotImplementedError |
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72 | |
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73 | @classmethod |
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74 | def now(cls): |
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75 | return cls(cls._now(Snapshot())) |
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76 | |
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77 | @classmethod |
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78 | def from_realtime(cls, realtime, snapshot=Snapshot()): |
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79 | return cls(realtime-snapshot.realtime()+cls._now(snapshot)) |
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80 | |
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81 | @classmethod |
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82 | def from_monotonic(cls, monotonic, snapshot=Snapshot()): |
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83 | return cls(monotonic-snapshot.monotonic()+cls._now(snapshot)) |
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84 | |
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85 | @classmethod |
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86 | def after(cls, seconds, snapshot=Snapshot()): |
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87 | return cls(cls._now(snapshot)+seconds) |
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88 | |
97 | 89 | @classmethod |
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90 | def after_other(cls, other, seconds, snapshot=Snapshot()): |
97 | 91 | if isinstance(other, cls): |
92 | return cls(other._value+seconds) | |
93 | else: | |
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94 | return cls.from_monotonic(other._monotonic(snapshot)+seconds, |
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95 | snapshot) |
97 | 96 | |
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97 | def datetime(self, snapshot=Snapshot()): |
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98 | return datetime.datetime.fromtimestamp(self._realtime(snapshot)) |
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99 | |
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100 | def seconds_to(self, snapshot=Snapshot()): |
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101 | return self._value-self._now(snapshot) |
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102 | |
97 | 103 | def isoformat(self): |
104 | return self.datetime().isoformat() | |
105 | ||
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106 | def realtime(self, snapshot=Snapshot()): |
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107 | return self._realtime(snapshot) |
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108 | |
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109 | def monotonic(self, snapshot=Snapshot()): |
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110 | return self._monotonic(snapshot) |
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111 | |
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112 | # Counted from the monotonic epoch, how far is this event? Usually should |
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113 | # equal self.monotonic(), but Dreamtime can be stopped by system sleep, |
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114 | # and will return ∞ (math.inf). |
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115 | def horizon(self, snapshot=Snapshot()): |
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116 | return self._monotonic(snapshot) |
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117 | |
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118 | def __compare(self, other, fn): |
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119 | if isinstance(other, self.__class__): |
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120 | return fn(self._value, other._value) |
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121 | else: |
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122 | snapshot=Snapshot() |
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123 | return fn(self._monotonic(snapshot), other._monotonic(snapshot)) |
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124 | |
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125 | def __lt__(self, other): |
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126 | return self.__compare(other, lambda x, y: x < y) |
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127 | |
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128 | def __gt__(self, other): |
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129 | return self.__compare(other, lambda x, y: x > y) |
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130 | |
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131 | def __le__(self, other): |
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132 | return self.__compare(other, lambda x, y: x <= y) |
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133 | |
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134 | def __ge__(self, other): |
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135 | return self.__compare(other, lambda x, y: x >= y) |
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136 | |
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137 | def __eq__(self, other): |
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138 | return self.__compare(other, lambda x, y: x == y) |
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139 | |
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140 | class RealTime(Time): |
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141 | def _realtime(self, snapshot): |
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142 | return self._value |
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143 | |
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144 | def _monotonic(self, snapshot): |
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145 | return self._value+(snapshot.monotonic()-snapshot.realtime()) |
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146 | |
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147 | @staticmethod |
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148 | def _now(snapshot): |
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149 | return snapshot.realtime() |
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150 | |
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151 | class MonotonicTime(Time): |
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152 | def _realtime(self, snapshot): |
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153 | return self._value+(snapshot.realtime()-snapshot.monotonic()) |
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154 | |
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155 | def _monotonic(self, snapshot): |
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156 | return self._value |
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157 | |
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158 | @staticmethod |
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159 | def _now(snapshot): |
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160 | return snapshot.monotonic() |
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161 | |
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162 | # class Infinity(Time): |
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163 | # def __init__(self): |
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164 | # super().__init__(math.inf) |
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165 | # |
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166 | # def _realtime(self, snapshot): |
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167 | # return math.inf |
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168 | # |
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169 | # def _monotonic(self, snapshot): |
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170 | # return math.inf |
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171 | # |
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172 | # @staticmethod |
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173 | # def _now(snapshot): |
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174 | # return 0 |
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175 | |
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176 | class DreamTime(Time): |
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177 | def _realtime(self, snapshot): |
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178 | return self._value+(snapshot.realtime()-snapshot.dreamtime()) |
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179 | |
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180 | # Important: monotonic is "static" within a wakeup period |
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181 | # and does not need to call time.monotonic(), as it gets compared |
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182 | # to a specific time.monotonic() realisation |
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183 | def _monotonic(self, snapshot): |
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184 | return self._value+(snapshot.monotonic()-snapshot.dreamtime()) |
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185 | |
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186 | def horizon(self, snapshot=Snapshot()): |
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187 | if snapshot.sleeping(): |
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188 | return math.inf |
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189 | else: |
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190 | return self._monotonic(snapshot) |
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191 | |
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192 | @staticmethod |
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193 | def _now(snapshot): |
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194 | return snapshot.dreamtime() |
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195 | |
97 | 196 | |
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197 | if platform.system()=='Darwin': |
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198 | |
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199 | import Foundation |
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200 | import AppKit |
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201 | |
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202 | def do_callbacks(callbacks, woke): |
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203 | for callback in callbacks.values(): |
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204 | try: |
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205 | callback(woke) |
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206 | except Exception: |
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207 | logger.exception("Error in sleep/wake notification callback") |
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208 | |
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209 | # |
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210 | # Wake up / sleep handling |
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211 | # |
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212 | |
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213 | class SleepHandler(Foundation.NSObject): |
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214 | """ Handle wake/sleep notifications """ |
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215 | |
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216 | def init(self): |
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217 | self.__sleeptime=None |
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218 | self.__slept=0 |
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219 | self.__epoch=time.monotonic() |
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220 | self.__lock=threading.Lock() |
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221 | self.__callbacks=weakref.WeakKeyDictionary() |
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222 | |
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223 | return self |
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224 | |
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225 | def handleSleepNotification_(self, aNotification): |
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226 | logger.info("System going to sleep") |
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227 | try: |
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228 | now=time.monotonic() |
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229 | with self.__lock: |
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230 | self.__sleeptime=now |
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231 | callbacks=self.__callbacks.copy() |
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232 | do_callbacks(callbacks, False) |
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233 | except: |
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234 | logger.exception("Bug in sleep handler") |
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235 | |
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236 | def handleWakeNotification_(self, aNotification): |
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237 | logger.info("System waking up from sleep") |
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238 | try: |
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239 | now=time.monotonic() |
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240 | with self.__lock: |
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241 | if self.__sleeptime: |
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242 | slept=max(0, now-self.__sleeptime) |
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243 | logger.info("Slept %f seconds" % slept) |
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244 | self.__slept=self.__slept+slept |
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245 | self.__sleeptime=None |
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246 | callbacks=self.__callbacks.copy() |
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247 | do_callbacks(callbacks, True) |
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248 | except: |
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249 | logger.exception("Bug in wakeup handler") |
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250 | |
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251 | # Return dreamtime |
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252 | def dreamtime_sleeping(self, snapshot=Snapshot()): |
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253 | sleeping=False |
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254 | with self.__lock: |
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255 | # macOS "sleep" signals / status are complete bollocks: at least |
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256 | # when plugged in, the system is actually sometimes running all |
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257 | # night with the lid closed and sleepNotification delivered. |
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258 | # Therefore, we need our timers to work in a sane manner when |
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259 | # we should be sleeping! |
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260 | if self.__sleeptime is not None: |
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261 | now_monotonic=self.__sleeptime |
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262 | sleeping=True |
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263 | else: |
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264 | now_monotonic=snapshot.monotonic() |
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265 | now_dreamtime=max(0, now_monotonic-self.__epoch-self.__slept) |
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266 | return now_dreamtime, sleeping |
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267 | |
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268 | # Weirdo (Py)ObjC naming to stop it form choking up |
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269 | def addForObj_aCallback_(self, obj, callback): |
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270 | with self.__lock: |
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271 | self.__callbacks[obj]=callback |
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272 | |
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273 | # obj is to use a a key in a weak key dictionary |
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274 | def add_callback(obj, callback): |
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275 | global _dreamtime_monitor |
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276 | |
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277 | monitor=_dreamtime_monitor |
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278 | if not monitor: |
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279 | raise Exception("Dreamtime monitor not started") |
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280 | else: |
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281 | monitor.addForObj_aCallback_(obj, callback) |
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282 | |
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283 | def start_monitoring(): |
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284 | global _dreamtime_monitor |
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285 | |
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286 | logger.debug("Starting to monitor system sleep") |
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287 | workspace = AppKit.NSWorkspace.sharedWorkspace() |
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288 | notification_center = workspace.notificationCenter() |
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289 | _dreamtime_monitor = SleepHandler.new() |
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290 | |
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291 | notification_center.addObserver_selector_name_object_( |
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292 | _dreamtime_monitor, |
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293 | "handleSleepNotification:", |
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294 | AppKit.NSWorkspaceWillSleepNotification, |
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295 | None) |
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296 | |
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297 | notification_center.addObserver_selector_name_object_( |
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298 | _dreamtime_monitor, |
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299 | "handleWakeNotification:", |
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300 | AppKit.NSWorkspaceDidWakeNotification, |
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301 | None) |
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302 | |
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303 | else: # Not on macOS |
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304 | |
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305 | def add_callback(obj, callback): |
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306 | pass |
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307 | |
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308 | def start_monitoring(): |
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309 | logger.warning(("No system sleep monitor implemented for '%s'" |
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310 | % platform.system())) |
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311 |