openwebrx-clone/owrx/service/schedule.py
2020-03-29 18:08:26 +02:00

274 lines
8.6 KiB
Python

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