227 lines
7.5 KiB
Python
227 lines
7.5 KiB
Python
import threading
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import wave
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from datetime import datetime, timedelta, date
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import time
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import sched
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import subprocess
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import os
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from multiprocessing.connection import Pipe
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from owrx.map import Map, LocatorLocation
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import re
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from owrx.config import PropertyManager
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import logging
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logger = logging.getLogger(__name__)
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class WsjtChopper(threading.Thread):
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def __init__(self, source):
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self.source = source
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self.tmp_dir = PropertyManager.getSharedInstance()["temporary_directory"]
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(self.wavefilename, self.wavefile) = self.getWaveFile()
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self.switchingLock = threading.Lock()
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self.scheduler = sched.scheduler(time.time, time.sleep)
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self.fileQueue = []
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(self.outputReader, self.outputWriter) = Pipe()
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self.doRun = True
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super().__init__()
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def getWaveFile(self):
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filename = "{tmp_dir}/openwebrx-wsjtchopper-{id}-{timestamp}.wav".format(
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tmp_dir = self.tmp_dir,
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id = id(self),
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timestamp = datetime.now().strftime("%Y%m%d-%H%M%S")
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)
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wavefile = wave.open(filename, "wb")
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wavefile.setnchannels(1)
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wavefile.setsampwidth(2)
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wavefile.setframerate(12000)
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return (filename, wavefile)
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def getNextDecodingTime(self):
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t = datetime.now()
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zeroed = t.replace(minute=0, second=0, microsecond=0)
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delta = t - zeroed
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seconds = (int(delta.total_seconds() / self.interval) + 1) * self.interval
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t = zeroed + timedelta(seconds = seconds)
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logger.debug("scheduling: {0}".format(t))
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return t.timestamp()
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def startScheduler(self):
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self._scheduleNextSwitch()
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threading.Thread(target = self.scheduler.run).start()
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def emptyScheduler(self):
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for event in self.scheduler.queue:
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self.scheduler.cancel(event)
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def _scheduleNextSwitch(self):
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self.scheduler.enterabs(self.getNextDecodingTime(), 1, self.switchFiles)
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def switchFiles(self):
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self.switchingLock.acquire()
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file = self.wavefile
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filename = self.wavefilename
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(self.wavefilename, self.wavefile) = self.getWaveFile()
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self.switchingLock.release()
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file.close()
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self.fileQueue.append(filename)
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self._scheduleNextSwitch()
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def decoder_commandline(self, file):
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'''
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must be overridden in child classes
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'''
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return []
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def decode(self):
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def decode_and_unlink(file):
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decoder = subprocess.Popen(self.decoder_commandline(file), stdout=subprocess.PIPE, cwd=self.tmp_dir)
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while True:
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line = decoder.stdout.readline()
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if line is None or (isinstance(line, bytes) and len(line) == 0):
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break
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self.outputWriter.send(line)
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rc = decoder.wait()
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logger.debug("decoder return code: %i", rc)
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os.unlink(file)
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self.decoder = decoder
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if self.fileQueue:
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file = self.fileQueue.pop()
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logger.debug("processing file {0}".format(file))
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threading.Thread(target=decode_and_unlink, args=[file]).start()
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def run(self) -> None:
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logger.debug("WSJT chopper starting up")
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self.startScheduler()
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while self.doRun:
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data = self.source.read(256)
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if data is None or (isinstance(data, bytes) and len(data) == 0):
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logger.warning("zero read on WSJT chopper")
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self.doRun = False
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else:
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self.switchingLock.acquire()
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self.wavefile.writeframes(data)
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self.switchingLock.release()
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self.decode()
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logger.debug("WSJT chopper shutting down")
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self.outputReader.close()
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self.outputWriter.close()
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self.emptyScheduler()
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try:
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os.unlink(self.wavefilename)
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except Exception:
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logger.exception("error removing undecoded file")
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def read(self):
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try:
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return self.outputReader.recv()
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except EOFError:
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return None
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class Ft8Chopper(WsjtChopper):
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def __init__(self, source):
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self.interval = 15
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super().__init__(source)
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def decoder_commandline(self, file):
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#TODO expose decoding quality parameters through config
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return ["jt9", "--ft8", "-d", "3", file]
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class WsprChopper(WsjtChopper):
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def __init__(self, source):
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self.interval = 120
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super().__init__(source)
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def decoder_commandline(self, file):
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#TODO expose decoding quality parameters through config
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return ["wsprd", "-d", file]
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class WsjtParser(object):
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locator_pattern = re.compile(".*\\s([A-Z0-9]+)\\s([A-R]{2}[0-9]{2})$")
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jt9_pattern = re.compile("^[0-9]{6} .*")
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wspr_pattern = re.compile("^[0-9]{4} .*")
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wspr_splitter_pattern = re.compile("([A-Z0-9]*)\\s([A-R]{2}[0-9]{2})\\s([0-9]+)")
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def __init__(self, handler):
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self.handler = handler
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modes = {
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"~": "FT8"
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}
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def parse(self, data):
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try:
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msg = data.decode().rstrip()
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# known debug messages we know to skip
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if msg.startswith("<DecodeFinished>"):
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return
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if msg.startswith(" EOF on input file"):
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return
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out = {}
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if WsjtParser.jt9_pattern.match(msg):
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out = self.parse_from_jt9(msg)
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elif WsjtParser.wspr_pattern.match(msg):
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out = self.parse_from_wsprd(msg)
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self.handler.write_wsjt_message(out)
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except ValueError:
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logger.exception("error while parsing wsjt message")
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def parse_from_jt9(self, msg):
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# ft8 sample
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# '222100 -15 -0.0 508 ~ CQ EA7MJ IM66'
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out = {}
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ts = datetime.strptime(msg[0:6], "%H%M%S")
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out["timestamp"] = int(datetime.combine(date.today(), ts.time(), datetime.now().tzinfo).timestamp() * 1000)
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out["db"] = float(msg[7:10])
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out["dt"] = float(msg[11:15])
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out["freq"] = int(msg[16:20])
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modeChar = msg[21:22]
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out["mode"] = mode = WsjtParser.modes[modeChar] if modeChar in WsjtParser.modes else "unknown"
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wsjt_msg = msg[24:60].strip()
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self.parseLocator(wsjt_msg, mode)
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out["msg"] = wsjt_msg
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return out
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def parseLocator(self, msg, mode):
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m = WsjtParser.locator_pattern.match(msg)
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if m is None:
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return
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# this is a valid locator in theory, but it's somewhere in the arctic ocean, near the north pole, so it's very
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# likely this just means roger roger goodbye.
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if m.group(2) == "RR73":
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return
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Map.getSharedInstance().updateLocation(m.group(1), LocatorLocation(m.group(2)), mode)
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def parse_from_wsprd(self, msg):
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# wspr sample
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# '2600 -24 0.4 0.001492 -1 G8AXA JO01 33'
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out = {}
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now = datetime.now()
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ts = datetime.strptime(msg[0:4], "%M%S").replace(hour=now.hour)
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out["timestamp"] = int(datetime.combine(date.today(), ts.time(), now.tzinfo).timestamp() * 1000)
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out["db"] = float(msg[5:8])
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out["dt"] = float(msg[9:13])
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out["freq"] = float(msg[14:24])
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out["drift"] = int(msg[25:28])
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out["mode"] = "WSPR"
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wsjt_msg = msg[29:].strip()
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out["msg"] = wsjt_msg
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self.parseWsprMessage(wsjt_msg)
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return out
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def parseWsprMessage(self, msg):
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m = WsjtParser.wspr_splitter_pattern.match(msg)
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if m is None:
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return
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Map.getSharedInstance().updateLocation(m.group(1), LocatorLocation(m.group(2)), "WSPR")
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