openwebrx-clone/owrx/map.py

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from datetime import datetime, timedelta
import threading, time
from owrx.config import PropertyManager
from owrx.bands import Band
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import logging
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logger = logging.getLogger(__name__)
class Location(object):
def __dict__(self):
return {}
class Map(object):
sharedInstance = None
@staticmethod
def getSharedInstance():
if Map.sharedInstance is None:
Map.sharedInstance = Map()
return Map.sharedInstance
def __init__(self):
self.clients = []
self.positions = {}
self.positionsLock = threading.Lock()
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def removeLoop():
loops = 0
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while True:
try:
self.removeOldPositions()
except Exception:
logger.exception("error while removing old map positions")
loops += 1
# rebuild the positions dictionary every once in a while, it consumes lots of memory otherwise
if loops == 60:
try:
self.rebuildPositions()
except Exception:
logger.exception("error while rebuilding positions")
loops = 0
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time.sleep(60)
threading.Thread(target=removeLoop, daemon=True).start()
super().__init__()
def broadcast(self, update):
for c in self.clients:
c.write_update(update)
def addClient(self, client):
self.clients.append(client)
client.write_update(
[
{
"callsign": callsign,
"location": record["location"].__dict__(),
"lastseen": record["updated"].timestamp() * 1000,
"mode": record["mode"],
"band": record["band"].getName() if record["band"] is not None else None,
}
for (callsign, record) in self.positions.items()
]
)
def removeClient(self, client):
try:
self.clients.remove(client)
except ValueError:
pass
def updateLocation(self, callsign, loc: Location, mode: str, band: Band = None):
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ts = datetime.now()
with self.positionsLock:
self.positions[callsign] = {"location": loc, "updated": ts, "mode": mode, "band": band}
self.broadcast(
[
{
"callsign": callsign,
"location": loc.__dict__(),
"lastseen": ts.timestamp() * 1000,
"mode": mode,
"band": band.getName() if band is not None else None,
}
]
)
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def touchLocation(self, callsign):
# not implemented on the client side yet, so do not use!
ts = datetime.now()
with self.positionsLock:
if callsign in self.positions:
self.positions[callsign]["updated"] = ts
self.broadcast([{"callsign": callsign, "lastseen": ts.timestamp() * 1000}])
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def removeLocation(self, callsign):
with self.positionsLock:
del self.positions[callsign]
# TODO broadcast removal to clients
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def removeOldPositions(self):
pm = PropertyManager.getSharedInstance()
retention = timedelta(seconds=pm["map_position_retention_time"])
cutoff = datetime.now() - retention
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to_be_removed = [callsign for (callsign, pos) in self.positions.items() if pos["updated"] < cutoff]
for callsign in to_be_removed:
self.removeLocation(callsign)
def rebuildPositions(self):
with self.positionsLock:
p = {key: value for key, value in self.positions.items()}
self.positions = p
class LatLngLocation(Location):
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def __init__(self, lat: float, lon: float):
self.lat = lat
self.lon = lon
def __dict__(self):
res = {"type": "latlon", "lat": self.lat, "lon": self.lon}
return res
class LocatorLocation(Location):
def __init__(self, locator: str):
self.locator = locator
def __dict__(self):
return {"type": "locator", "locator": self.locator}