-"""
-For when responding to the terminal is not trivial
-"""
-
-from .GT06mod import *
-from .opencellid import qry_cell
-
-def prepare_response(conf, msg):
- if isinstance(msg, WIFI_POSITIONING):
- lat, lon = qry_cell(conf["opencellid"]["dbfn"],
- msg.mcc, msg.gsm_cells)
- return {"lat": lat, "lon": lon}
- return {}
+""" Estimate coordinates from WIFI_POSITIONING and send back """
+
+from datetime import datetime, timezone
+from importlib import import_module
+from logging import getLogger
+from os import umask
+from struct import pack
+import zmq
+
+from . import common
+from .gps303proto import parse_message, WIFI_POSITIONING
+from .zmsg import Bcast, Resp, topic
+
+log = getLogger("gps303/lookaside")
+
+
+def runserver(conf):
+ if conf.get("lookaside", "backend") == "opencellid":
+ qry = import_module(".opencellid", __package__)
+ else:
+ raise NotImplementedError(
+ "Lookaside only implements opencellid backend"
+ )
+ qry.init(conf)
+ zctx = zmq.Context()
+ zsub = zctx.socket(zmq.SUB)
+ zsub.connect(conf.get("collector", "publishurl"))
+ zsub.setsockopt(zmq.SUBSCRIBE, topic(WIFI_POSITIONING.PROTO))
+ zpush = zctx.socket(zmq.PUSH)
+ zpush.connect(conf.get("collector", "listenurl"))
+
+ try:
+ while True:
+ zmsg = Bcast(zsub.recv())
+ msg = parse_message(zmsg.packet)
+ log.debug(
+ "IMEI %s from %s at %s: %s",
+ zmsg.imei,
+ zmsg.peeraddr,
+ datetime.fromtimestamp(zmsg.when).astimezone(tz=timezone.utc),
+ msg,
+ )
+ lat, lon = qry.lookup(msg.mcc, msg.gsm_cells, msg.wifi_aps)
+ resp = Resp(
+ imei=zmsg.imei,
+ when=zmsg.when, # not the current time, but the original!
+ packet=msg.Out(latitude=lat, longitude=lon).packed,
+ )
+ log.debug("Response for lat=%s, lon=%s: %s", lat, lon, resp)
+ zpush.send(resp.packed)
+
+ except KeyboardInterrupt:
+ pass
+
+
+if __name__.endswith("__main__"):
+ runserver(common.init(log))