274 lines
8.6 KiB
Python
274 lines
8.6 KiB
Python
from datetime import datetime, timezone, timedelta
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from owrx.source import SdrSource
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from owrx.config import Config
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import threading
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import math
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from abc import ABC, ABCMeta, abstractmethod
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import logging
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logger = logging.getLogger(__name__)
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class ScheduleEntry(ABC):
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def __init__(self, startTime, endTime, profile):
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self.startTime = startTime
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self.endTime = endTime
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self.profile = profile
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def getProfile(self):
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return self.profile
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def __str__(self):
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return "{0} - {1}: {2}".format(self.startTime, self.endTime, self.profile)
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@abstractmethod
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def isCurrent(self, dt):
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pass
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@abstractmethod
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def getScheduledEnd(self):
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pass
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@abstractmethod
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def getNextActivation(self):
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pass
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class TimeScheduleEntry(ScheduleEntry):
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def isCurrent(self, dt):
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time = dt.time()
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if self.startTime < self.endTime:
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return self.startTime <= time < self.endTime
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else:
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return self.startTime <= time or time < self.endTime
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def getScheduledEnd(self):
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now = datetime.utcnow()
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end = now.combine(date=now.date(), time=self.endTime)
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while end < now:
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end += timedelta(days=1)
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return end
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def getNextActivation(self):
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now = datetime.utcnow()
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start = now.combine(date=now.date(), time=self.startTime)
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while start < now:
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start += timedelta(days=1)
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return start
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class DatetimeScheduleEntry(ScheduleEntry):
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def isCurrent(self, dt):
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return self.startTime <= dt < self.endTime
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def getScheduledEnd(self):
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return self.endTime
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def getNextActivation(self):
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return self.startTime
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class Schedule(ABC):
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@staticmethod
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def parse(props):
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# downwards compatibility
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if "schedule" in props:
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return StaticSchedule(props["schedule"])
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elif "scheduler" in props:
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sc = props["scheduler"]
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t = sc["type"] if "type" in sc else "static"
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if t == "static":
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return StaticSchedule(sc["schedule"])
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elif t == "daylight":
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return DaylightSchedule(sc["schedule"])
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else:
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logger.warning("Invalid scheduler type: %s", t)
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@abstractmethod
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def getCurrentEntry(self):
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pass
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@abstractmethod
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def getNextEntry(self):
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pass
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class TimerangeSchedule(Schedule, metaclass=ABCMeta):
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@abstractmethod
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def getEntries(self):
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pass
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def getCurrentEntry(self):
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current = [p for p in self.getEntries() if p.isCurrent(datetime.utcnow())]
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if current:
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return current[0]
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return None
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def getNextEntry(self):
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s = sorted(self.getEntries(), key=lambda e: e.getNextActivation())
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if s:
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return s[0]
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return None
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class StaticSchedule(TimerangeSchedule):
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def __init__(self, scheduleDict):
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self.entries = []
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for time, profile in scheduleDict.items():
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if len(time) != 9:
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logger.warning("invalid schedule spec: %s", time)
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continue
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startTime = datetime.strptime(time[0:4], "%H%M").replace(tzinfo=timezone.utc).time()
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endTime = datetime.strptime(time[5:9], "%H%M").replace(tzinfo=timezone.utc).time()
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self.entries.append(TimeScheduleEntry(startTime, endTime, profile))
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def getEntries(self):
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return self.entries
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class DaylightSchedule(TimerangeSchedule):
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greyLineTime = timedelta(hours=1)
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def __init__(self, scheduleDict):
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self.schedule = scheduleDict
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def getSunTimes(self, date):
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pm = Config.get()
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lat = pm["receiver_gps"]["lat"]
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lng = pm["receiver_gps"]["lon"]
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degtorad = math.pi / 180
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radtodeg = 180 / math.pi
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#Number of days since 01/01
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days = date.timetuple().tm_yday
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# Longitudinal correction
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longCorr = 4 * lng
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# calibrate for solstice
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b = 2 * math.pi * (days - 81) / 365
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# Equation of Time Correction
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eoTCorr = 9.87 * math.sin(2 * b) - 7.53 * math.cos(b) - 1.5 * math.sin(b)
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# Solar correction
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solarCorr = longCorr + eoTCorr
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# Solar declination
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declination = math.asin(math.sin(23.45 * degtorad) * math.sin(b))
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sunrise = 12 - math.acos(-math.tan(lat * degtorad) * math.tan(declination)) * radtodeg / 15 - solarCorr / 60
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sunset = 12 + math.acos(-math.tan(lat * degtorad) * math.tan(declination)) * radtodeg / 15 - solarCorr / 60
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midnight = datetime.combine(date, datetime.min.time())
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sunrise = midnight + timedelta(hours=sunrise)
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sunset = midnight + timedelta(hours=sunset)
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logger.debug("for {date} sunrise: {sunrise} sunset {sunset}".format(date=date, sunrise=sunrise, sunset=sunset))
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return sunrise, sunset
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def getEntries(self):
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now = datetime.utcnow()
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date = now.date()
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# greyline is optional, it its set it will shorten the other profiles
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useGreyline = "greyline" in self.schedule
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entries = []
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delta = DaylightSchedule.greyLineTime if useGreyline else timedelta()
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events = []
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# we need to start yesterday for longitudes close to the date line
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offset = -1
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while len(events) < 1:
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sunrise, sunset = self.getSunTimes(date + timedelta(days=offset))
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offset += 1
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events += [{"type": "sunrise", "time": sunrise}, {"type": "sunset", "time": sunset}]
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# keep only events in the future
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events = [v for v in events if v["time"] + delta > now]
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events.sort(key=lambda e: e["time"])
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previousEvent = None
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for event in events:
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# night profile _until_ sunrise, day profile _until_ sunset
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stype = "night" if event["type"] == "sunrise" else "day"
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if previousEvent is not None or event["time"] - delta > now:
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start = now if previousEvent is None else previousEvent
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entries.append(DatetimeScheduleEntry(start, event["time"] - delta, self.schedule[stype]))
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if useGreyline:
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entries.append(
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DatetimeScheduleEntry(event["time"] - delta, event["time"] + delta, self.schedule["greyline"])
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)
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previousEvent = event["time"] + delta
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logger.debug([str(e) for e in entries])
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return entries
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class ServiceScheduler(object):
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def __init__(self, source):
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self.source = source
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self.selectionTimer = None
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self.source.addClient(self)
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props = self.source.getProps()
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self.schedule = Schedule.parse(props)
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props.filter("center_freq", "samp_rate").wire(self.onFrequencyChange)
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self.scheduleSelection()
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def shutdown(self):
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self.cancelTimer()
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self.source.removeClient(self)
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def scheduleSelection(self, time=None):
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if self.source.getState() == SdrSource.STATE_FAILED:
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return
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seconds = 10
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if time is not None:
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delta = time - datetime.utcnow()
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seconds = delta.total_seconds()
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self.cancelTimer()
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self.selectionTimer = threading.Timer(seconds, self.selectProfile)
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self.selectionTimer.start()
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def cancelTimer(self):
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if self.selectionTimer:
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self.selectionTimer.cancel()
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def getClientClass(self):
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return SdrSource.CLIENT_BACKGROUND
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def onStateChange(self, state):
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if state == SdrSource.STATE_STOPPING:
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self.scheduleSelection()
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elif state == SdrSource.STATE_FAILED:
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self.cancelTimer()
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def onBusyStateChange(self, state):
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if state == SdrSource.BUSYSTATE_IDLE:
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self.scheduleSelection()
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def onFrequencyChange(self, name, value):
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self.scheduleSelection()
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def selectProfile(self):
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if self.source.hasClients(SdrSource.CLIENT_USER):
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logger.debug("source has active users; not touching")
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return
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logger.debug("source seems to be idle, selecting profile for background services")
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entry = self.schedule.getCurrentEntry()
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if entry is None:
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logger.debug("schedule did not return a profile. checking next entry...")
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nextEntry = self.schedule.getNextEntry()
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if nextEntry is not None:
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self.scheduleSelection(nextEntry.getNextActivation())
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return
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logger.debug("selected profile %s until %s", entry.getProfile(), entry.getScheduledEnd())
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self.scheduleSelection(entry.getScheduledEnd())
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try:
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self.source.activateProfile(entry.getProfile())
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self.source.start()
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except KeyError:
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pass
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