223 lines
7.8 KiB
Python
223 lines
7.8 KiB
Python
#
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# Copyright 2010 Nick Foster
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#
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# This file is part of gr-air-modes
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#
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# gr-air-modes is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# any later version.
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#
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# gr-air-modes is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with gr-air-modes; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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#
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import time, os, sys, socket
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from string import split, join
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import air_modes
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import datetime
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from air_modes.exceptions import *
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import threading
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class dumb_task_runner(threading.Thread):
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def __init__(self, task, interval):
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threading.Thread.__init__(self)
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self._task = task
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self._interval = interval
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self.shutdown = threading.Event()
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self.finished = threading.Event()
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self.setDaemon(True)
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self.start()
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def run(self):
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while not self.shutdown.is_set():
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self._task()
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time.sleep(self._interval)
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self.finished.set()
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def close(self):
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self.shutdown.set()
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self.finished.wait(self._interval)
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class output_sbs1:
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def __init__(self, cprdec, port, pub):
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self._s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self._s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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self._s.bind(('', port))
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self._s.listen(1)
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self._s.setblocking(0) #nonblocking
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self._conns = [] #list of active connections
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self._aircraft_id_map = {} # dictionary of icao24 to aircraft IDs
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self._aircraft_id_count = 0 # Current Aircraft ID count
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self._cpr = cprdec
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#it could be cleaner if there were separate output_* fns
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#but this works
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for i in (0, 4, 5, 11, 17):
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pub.subscribe("type%i_dl" % i, self.output)
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#spawn thread to add new connections as they come in
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self._runner = dumb_task_runner(self.add_pending_conns, 0.1)
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def __del__(self):
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self._s.close()
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def get_aircraft_id(self, icao24):
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if icao24 in self._aircraft_id_map:
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return self._aircraft_id_map[icao24]
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# Adding this new ID to the dictionary
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self._aircraft_id_count += 1
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self._aircraft_id_map[icao24] = self._aircraft_id_count
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# Checking to see if we need to clean up in the event that the
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# dictionary is getting too large.
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if len(self._aircraft_id_map) > 1e4:
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minimum = min(self._aircraft_id_map.values()) + (len(self._aircraft_id_map) - 1e4)
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for icao, _id in self._aircraft_id_map:
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if _id < minimum:
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del self._aircraft_id_map[icao]
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# Finally return the new pair
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return self._aircraft_id_count
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def output(self, msg):
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try:
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sbs1_msg = self.parse(msg)
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if sbs1_msg is not None:
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for conn in self._conns[:]: #iterate over a copy of the list
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conn.send(sbs1_msg)
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except socket.error:
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self._conns.remove(conn)
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print "Connections: ", len(self._conns)
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except ADSBError:
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pass
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def add_pending_conns(self):
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try:
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conn, addr = self._s.accept()
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self._conns.append(conn)
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print "Connections: ", len(self._conns)
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except socket.error:
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pass
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def current_time(self):
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timenow = datetime.datetime.now()
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return [timenow.strftime("%Y/%m/%d"), timenow.strftime("%H:%M:%S.%f")[0:-3]]
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def decode_fs(self, fs):
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if fs == 0:
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return "0,0,0,0"
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elif fs == 1:
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return "0,0,0,1"
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elif fs == 2:
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return "1,0,0,0"
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elif fs == 3:
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return "1,0,0,1"
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elif fs == 4:
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return "1,0,1,"
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elif fs == 5:
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return "0,0,1,"
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else:
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return ",,,"
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def parse(self, msg):
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#assembles a SBS-1-style output string from the received message
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msgtype = msg.data["df"]
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outmsg = None
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if msgtype == 0:
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outmsg = self.pp0(msg.data, msg.ecc)
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elif msgtype == 4:
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outmsg = self.pp4(msg.data, msg.ecc)
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elif msgtype == 5:
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outmsg = self.pp5(msg.data, msg.ecc)
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elif msgtype == 11:
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outmsg = self.pp11(msg.data, msg.ecc)
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elif msgtype == 17:
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outmsg = self.pp17(msg.data)
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else:
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raise NoHandlerError(msgtype)
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return outmsg
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def pp0(self, shortdata, ecc):
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[datestr, timestr] = self.current_time()
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aircraft_id = self.get_aircraft_id(ecc)
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retstr = "MSG,7,0,%i,%06X,%i,%s,%s,%s,%s,,%s,,,,,,,,,," % (aircraft_id, ecc, aircraft_id+100, datestr, timestr, datestr, timestr, air_modes.decode_alt(shortdata["ac"], True))
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if shortdata["vs"]:
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retstr += "1\r\n"
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else:
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retstr += "0\r\n"
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return retstr
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def pp4(self, shortdata, ecc):
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[datestr, timestr] = self.current_time()
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aircraft_id = self.get_aircraft_id(ecc)
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retstr = "MSG,5,0,%i,%06X,%i,%s,%s,%s,%s,,%s,,,,,,," % (aircraft_id, ecc, aircraft_id+100, datestr, timestr, datestr, timestr, air_modes.decode_alt(shortdata["ac"], True))
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return retstr + self.decode_fs(shortdata["fs"]) + "\r\n"
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def pp5(self, shortdata, ecc):
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[datestr, timestr] = self.current_time()
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aircraft_id = self.get_aircraft_id(ecc)
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retstr = "MSG,6,0,%i,%06X,%i,%s,%s,%s,%s,,,,,,,,%04i," % (aircraft_id, ecc, aircraft_id+100, datestr, timestr, datestr, timestr, air_modes.decode_id(shortdata["id"]))
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return retstr + self.decode_fs(shortdata["fs"]) + "\r\n"
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def pp11(self, shortdata, ecc):
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[datestr, timestr] = self.current_time()
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aircraft_id = self.get_aircraft_id(shortdata["aa"])
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return "MSG,8,0,%i,%06X,%i,%s,%s,%s,%s,,,,,,,,,,,,\r\n" % (aircraft_id, shortdata["aa"], aircraft_id+100, datestr, timestr, datestr, timestr)
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def pp17(self, data):
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icao24 = data["aa"]
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aircraft_id = self.get_aircraft_id(icao24)
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bdsreg = data["me"].get_type()
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retstr = None
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#we'll get better timestamps later, hopefully with actual VRT time
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#in them
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[datestr, timestr] = self.current_time()
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if bdsreg == 0x08:
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# Aircraft Identification
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(msg, typestring) = air_modes.parseBDS08(data)
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retstr = "MSG,1,0,%i,%06X,%i,%s,%s,%s,%s,%s,,,,,,,,,,,\r\n" % (aircraft_id, icao24, aircraft_id+100, datestr, timestr, datestr, timestr, msg)
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elif bdsreg == 0x06:
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# Surface position measurement
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[ground_track, decoded_lat, decoded_lon, rnge, bearing] = air_modes.parseBDS06(data, self._cpr)
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altitude = 0
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if decoded_lat is None: #no unambiguously valid position available
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retstr = None
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else:
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retstr = "MSG,2,0,%i,%06X,%i,%s,%s,%s,%s,,%i,,,%.5f,%.5f,,,,0,0,0\r\n" % (aircraft_id, icao24, aircraft_id+100, datestr, timestr, datestr, timestr, altitude, decoded_lat, decoded_lon)
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elif bdsreg == 0x05:
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# Airborne position measurements
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# WRONG (rnge, bearing), is this still true?
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[altitude, decoded_lat, decoded_lon, rnge, bearing] = air_modes.parseBDS05(data, self._cpr)
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if decoded_lat is None: #no unambiguously valid position available
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retstr = None
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else:
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retstr = "MSG,3,0,%i,%06X,%i,%s,%s,%s,%s,,%i,,,%.5f,%.5f,,,,0,0,0\r\n" % (aircraft_id, icao24, aircraft_id+100, datestr, timestr, datestr, timestr, altitude, decoded_lat, decoded_lon)
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elif bdsreg == 0x09:
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# Airborne velocity measurements
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# WRONG (heading, vert_spd), Is this still true?
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subtype = data["bds09"].get_type()
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if subtype == 0 or subtype == 1:
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parser = air_modes.parseBDS09_0 if subtype == 0 else air_modes.parseBDS09_1
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[velocity, heading, vert_spd] = parser(data)
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retstr = "MSG,4,0,%i,%06X,%i,%s,%s,%s,%s,,,%.1f,%.1f,,,%i,,,,,\r\n" % (aircraft_id, icao24, aircraft_id+100, datestr, timestr, datestr, timestr, velocity, heading, vert_spd)
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return retstr
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