302 lines
9.2 KiB
Python
302 lines
9.2 KiB
Python
from abc import ABC, ABCMeta, abstractmethod
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from owrx.config import Config
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from owrx.metrics import Metrics, CounterMetric, DirectMetric
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import threading
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import wave
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import subprocess
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import os
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from multiprocessing.connection import Pipe, wait
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from datetime import datetime, timedelta
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from queue import Queue, Full, Empty
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import logging
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logger = logging.getLogger(__name__)
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logger.setLevel(logging.INFO)
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class QueueJob(object):
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def __init__(self, decoder, file, freq):
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self.decoder = decoder
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self.file = file
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self.freq = freq
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def run(self):
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self.decoder.decode(self)
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def unlink(self):
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try:
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os.unlink(self.file)
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except FileNotFoundError:
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pass
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PoisonPill = object()
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class QueueWorker(threading.Thread):
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def __init__(self, queue):
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self.queue = queue
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self.doRun = True
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super().__init__()
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def run(self) -> None:
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while self.doRun:
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job = self.queue.get()
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if job is PoisonPill:
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self.doRun = False
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else:
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try:
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job.run()
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except Exception:
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logger.exception("failed to decode job")
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self.queue.onError()
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finally:
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job.unlink()
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self.queue.task_done()
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class DecoderQueue(Queue):
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sharedInstance = None
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creationLock = threading.Lock()
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@staticmethod
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def getSharedInstance():
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with DecoderQueue.creationLock:
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if DecoderQueue.sharedInstance is None:
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pm = Config.get()
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DecoderQueue.sharedInstance = DecoderQueue(
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maxsize=pm["decoding_queue_length"], workers=pm["decoding_queue_workers"]
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)
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return DecoderQueue.sharedInstance
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@staticmethod
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def stopAll():
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with DecoderQueue.creationLock:
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if DecoderQueue.sharedInstance is not None:
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DecoderQueue.sharedInstance.stop()
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DecoderQueue.sharedInstance = None
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def __init__(self, maxsize, workers):
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super().__init__(maxsize)
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metrics = Metrics.getSharedInstance()
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metrics.addMetric("decoding.queue.length", DirectMetric(self.qsize))
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self.inCounter = CounterMetric()
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metrics.addMetric("decoding.queue.in", self.inCounter)
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self.outCounter = CounterMetric()
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metrics.addMetric("decoding.queue.out", self.outCounter)
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self.overflowCounter = CounterMetric()
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metrics.addMetric("decoding.queue.overflow", self.overflowCounter)
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self.errorCounter = CounterMetric()
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metrics.addMetric("decoding.queue.error", self.errorCounter)
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self.workers = [self.newWorker() for _ in range(0, workers)]
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def stop(self):
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logger.debug("shutting down the queue")
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try:
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# purge all remaining jobs
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while not self.empty():
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job = self.get()
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job.unlink()
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self.task_done()
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except Empty:
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pass
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# put() a PoisonPill for all active workers to shut them down
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for w in self.workers:
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if w.is_alive():
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self.put(PoisonPill)
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self.join()
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def put(self, item, **kwars):
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self.inCounter.inc()
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try:
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super(DecoderQueue, self).put(item, block=False)
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except Full:
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self.overflowCounter.inc()
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raise
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def get(self, **kwargs):
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# super.get() is blocking, so it would mess up the stats to inc() first
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out = super(DecoderQueue, self).get(**kwargs)
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self.outCounter.inc()
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return out
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def newWorker(self):
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worker = QueueWorker(self)
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worker.start()
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return worker
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def onError(self):
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self.errorCounter.inc()
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class AudioChopperProfile(ABC):
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@abstractmethod
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def getInterval(self):
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pass
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@abstractmethod
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def getFileTimestampFormat(self):
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pass
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@abstractmethod
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def decoder_commandline(self, file):
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pass
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class AudioWriter(object):
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def __init__(self, dsp, source, profile: AudioChopperProfile):
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self.dsp = dsp
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self.source = source
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self.profile = profile
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self.tmp_dir = Config.get()["temporary_directory"]
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self.wavefile = None
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self.wavefilename = None
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self.switchingLock = threading.Lock()
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self.timer = None
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(self.outputReader, self.outputWriter) = Pipe()
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def getWaveFile(self):
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filename = "{tmp_dir}/openwebrx-audiochopper-{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.utcnow().strftime(self.profile.getFileTimestampFormat()),
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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.utcnow()
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zeroed = t.replace(minute=0, second=0, microsecond=0)
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delta = t - zeroed
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interval = self.profile.getInterval()
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seconds = (int(delta.total_seconds() / interval) + 1) * 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
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def cancelTimer(self):
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if self.timer:
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self.timer.cancel()
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self.timer = None
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def _scheduleNextSwitch(self):
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self.cancelTimer()
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delta = self.getNextDecodingTime() - datetime.utcnow()
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self.timer = threading.Timer(delta.total_seconds(), self.switchFiles)
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self.timer.start()
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def switchFiles(self):
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with self.switchingLock:
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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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file.close()
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job = QueueJob(self, filename, self.dsp.get_operating_freq())
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try:
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DecoderQueue.getSharedInstance().put(job)
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except Full:
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logger.warning("decoding queue overflow; dropping one file")
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job.unlink()
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self._scheduleNextSwitch()
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def decode(self, job: QueueJob):
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logger.debug("processing file %s", job.file)
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decoder = subprocess.Popen(
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["nice", "-n", "10"] + self.profile.decoder_commandline(job.file),
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stdout=subprocess.PIPE,
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cwd=self.tmp_dir,
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close_fds=True,
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)
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try:
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for line in decoder.stdout:
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self.outputWriter.send((self.profile, job.freq, line))
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except (OSError, AttributeError):
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decoder.stdout.flush()
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# TODO uncouple parsing from the output so that decodes can still go to the map and the spotters
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logger.debug("output has gone away while decoding job.")
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try:
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rc = decoder.wait(timeout=10)
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if rc != 0:
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raise RuntimeError("decoder return code: {0}".format(rc))
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except subprocess.TimeoutExpired:
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logger.warning("subprocess (pid=%i}) did not terminate correctly; sending kill signal.", decoder.pid)
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decoder.kill()
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raise
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def start(self):
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(self.wavefilename, self.wavefile) = self.getWaveFile()
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self._scheduleNextSwitch()
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def write(self, data):
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with self.switchingLock:
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self.wavefile.writeframes(data)
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def stop(self):
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self.outputWriter.close()
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self.outputWriter = None
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# drain messages left in the queue so that the queue can be successfully closed
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# this is necessary since python keeps the file descriptors open otherwise
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try:
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while True:
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self.outputReader.recv()
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except EOFError:
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pass
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self.outputReader.close()
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self.outputReader = None
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self.cancelTimer()
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try:
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self.wavefile.close()
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except Exception:
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logger.exception("error closing wave file")
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try:
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with self.switchingLock:
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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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self.wavefile = None
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self.wavefilename = None
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class AudioChopper(threading.Thread, metaclass=ABCMeta):
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def __init__(self, dsp, source, *profiles: AudioChopperProfile):
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self.source = source
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self.writers = [AudioWriter(dsp, source, p) for p in profiles]
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self.doRun = True
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super().__init__()
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def run(self) -> None:
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logger.debug("Audio chopper starting up")
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for w in self.writers:
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w.start()
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while self.doRun:
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data = None
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try:
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data = self.source.read(256)
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except ValueError:
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pass
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if data is None or (isinstance(data, bytes) and len(data) == 0):
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self.doRun = False
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else:
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for w in self.writers:
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w.write(data)
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logger.debug("Audio chopper shutting down")
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for w in self.writers:
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w.stop()
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def read(self):
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try:
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readers = wait([w.outputReader for w in self.writers])
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return [r.recv() for r in readers]
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except (EOFError, OSError):
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return None
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