openwebrx-clone/owrx/meta.py

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from owrx.config import PropertyManager
from urllib import request
import json
from datetime import datetime, timedelta
import logging
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import threading
from owrx.map import Map, LatLngLocation
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logger = logging.getLogger(__name__)
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class DmrCache(object):
sharedInstance = None
@staticmethod
def getSharedInstance():
if DmrCache.sharedInstance is None:
DmrCache.sharedInstance = DmrCache()
return DmrCache.sharedInstance
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def __init__(self):
self.cache = {}
self.cacheTimeout = timedelta(seconds = 86400)
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def isValid(self, key):
if not key in self.cache: return False
entry = self.cache[key]
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return entry["timestamp"] + self.cacheTimeout > datetime.now()
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def put(self, key, value):
self.cache[key] = {
"timestamp": datetime.now(),
"data": value
}
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def get(self, key):
if not self.isValid(key): return None
return self.cache[key]["data"]
class DmrMetaEnricher(object):
def __init__(self):
self.threads = {}
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def downloadRadioIdData(self, id):
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cache = DmrCache.getSharedInstance()
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try:
logger.debug("requesting DMR metadata for id=%s", id)
res = request.urlopen("https://www.radioid.net/api/dmr/user/?id={0}".format(id), timeout=30).read()
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data = json.loads(res.decode("utf-8"))
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cache.put(id, data)
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except json.JSONDecodeError:
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cache.put(id, None)
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del self.threads[id]
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def enrich(self, meta):
if not PropertyManager.getSharedInstance()["digital_voice_dmr_id_lookup"]: return None
if not "source" in meta: return None
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id = meta["source"]
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cache = DmrCache.getSharedInstance()
if not cache.isValid(id):
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if not id in self.threads:
self.threads[id] = threading.Thread(target=self.downloadRadioIdData, args=[id])
self.threads[id].start()
return None
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data = cache.get(id)
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if "count" in data and data["count"] > 0 and "results" in data:
return data["results"][0]
return None
class YsfMetaEnricher(object):
def enrich(self, meta):
if "source" in meta and "lat" in meta and "lon" in meta:
# TODO parsing the float values should probably happen earlier
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loc = LatLngLocation(float(meta["lat"]), float(meta["lon"]))
Map.getSharedInstance().updateLocation(meta["source"], loc, "YSF")
return None
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class MetaParser(object):
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enrichers = {
"DMR": DmrMetaEnricher(),
"YSF": YsfMetaEnricher()
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}
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def __init__(self, handler):
self.handler = handler
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def parse(self, meta):
fields = meta.split(";")
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meta = {v[0]: "".join(v[1:]) for v in map(lambda x: x.split(":"), fields) if v[0] != ""}
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if "protocol" in meta:
protocol = meta["protocol"]
if protocol in MetaParser.enrichers:
additional_data = MetaParser.enrichers[protocol].enrich(meta)
if additional_data is not None: meta["additional"] = additional_data
self.handler.write_metadata(meta)