from owrx.config import Config import threading import subprocess import os import socket import shlex import time import signal from abc import ABC, abstractmethod from owrx.command import CommandMapper from owrx.socket import getAvailablePort from owrx.property import PropertyStack, PropertyLayer import logging logger = logging.getLogger(__name__) class SdrSource(ABC): STATE_STOPPED = 0 STATE_STARTING = 1 STATE_RUNNING = 2 STATE_STOPPING = 3 STATE_TUNING = 4 STATE_FAILED = 5 BUSYSTATE_IDLE = 0 BUSYSTATE_BUSY = 1 CLIENT_INACTIVE = 0 CLIENT_BACKGROUND = 1 CLIENT_USER = 2 def __init__(self, id, props): self.id = id self.props = PropertyStack() # layer 0 reserved for profile properties self.props.addLayer(1, props) self.props.addLayer(2, Config.get()) self.rtlProps = self.props.collect(*self.getEventNames()) self.profile_id = None self.activateProfile() self.wireEvents() self.commandMapper = None if "port" in props and props["port"] is not None: self.port = props["port"] else: self.port = getAvailablePort() self.monitor = None self.clients = [] self.spectrumClients = [] self.spectrumThread = None self.process = None self.modificationLock = threading.Lock() self.failed = False self.state = SdrSource.STATE_STOPPED self.busyState = SdrSource.BUSYSTATE_IDLE if self.isAlwaysOn(): self.start() def isAlwaysOn(self): return "always-on" in self.props and self.props["always-on"] def getEventNames(self): return [ "samp_rate", "center_freq", "ppm", "rf_gain", "lfo_offset", ] def getCommandMapper(self): if self.commandMapper is None: self.commandMapper = CommandMapper() return self.commandMapper @abstractmethod def onPropertyChange(self, name, value): pass def wireEvents(self): self.rtlProps.wire(self.onPropertyChange) def getCommand(self): return [self.getCommandMapper().map(self.getCommandValues())] def activateProfile(self, profile_id=None): profiles = self.props["profiles"] if profile_id is None: profile_id = list(profiles.keys())[0] if profile_id not in profiles: logger.warning("invalid profile %s for sdr %s. ignoring", profile_id, self.id) return if profile_id == self.profile_id: return logger.debug("activating profile {0}".format(profile_id)) self.props["profile_id"] = profile_id profile = profiles[profile_id] self.profile_id = profile_id layer = PropertyLayer() for (key, value) in profile.items(): # skip the name, that would overwrite the source name. if key == "name": continue layer[key] = value self.props.replaceLayer(0, layer) def getId(self): return self.id def getProfileId(self): return self.profile_id def getProfiles(self): return self.props["profiles"] def getName(self): return self.props["name"] def getProps(self): return self.props def getPort(self): return self.port def getCommandValues(self): dict = self.rtlProps.__dict__() if "lfo_offset" in dict and dict["lfo_offset"] is not None: dict["tuner_freq"] = dict["center_freq"] + dict["lfo_offset"] else: dict["tuner_freq"] = dict["center_freq"] return dict def start(self): with self.modificationLock: if self.monitor: return try: self.preStart() except Exception: logger.exception("Exception during preStart()") cmd = self.getCommand() cmd = [c for c in cmd if c is not None] # don't use shell mode for commands without piping if len(cmd) > 1: # multiple commands with pipes cmd = "|".join(cmd) self.process = subprocess.Popen(cmd, shell=True, start_new_session=True) else: # single command cmd = cmd[0] # start_new_session can go as soon as there's no piped commands left # the os.killpg call must be replaced with something more reasonable at the same time self.process = subprocess.Popen(shlex.split(cmd), start_new_session=True) logger.info("Started sdr source: " + cmd) available = False def wait_for_process_to_end(): rc = self.process.wait() logger.debug("shut down with RC={0}".format(rc)) self.monitor = None self.monitor = threading.Thread(target=wait_for_process_to_end) self.monitor.start() retries = 1000 while retries > 0: retries -= 1 if self.monitor is None: break testsock = socket.socket() try: testsock.connect(("127.0.0.1", self.getPort())) testsock.close() available = True break except: time.sleep(0.1) if not available: self.failed = True try: self.postStart() except Exception: logger.exception("Exception during postStart()") self.failed = True self.setState(SdrSource.STATE_FAILED if self.failed else SdrSource.STATE_RUNNING) def preStart(self): """ override this method in subclasses if there's anything to be done before starting up the actual SDR """ pass def postStart(self): """ override this method in subclasses if there's things to do after the actual SDR has started up """ pass def isAvailable(self): return self.monitor is not None def isFailed(self): return self.failed def stop(self): self.setState(SdrSource.STATE_STOPPING) with self.modificationLock: if self.process is not None: try: os.killpg(os.getpgid(self.process.pid), signal.SIGTERM) except ProcessLookupError: # been killed by something else, ignore pass if self.monitor: self.monitor.join() self.setState(SdrSource.STATE_STOPPED) def hasClients(self, *args): clients = [c for c in self.clients if c.getClientClass() in args] return len(clients) > 0 def addClient(self, c): self.clients.append(c) hasUsers = self.hasClients(SdrSource.CLIENT_USER) hasBackgroundTasks = self.hasClients(SdrSource.CLIENT_BACKGROUND) if hasUsers or hasBackgroundTasks: self.start() self.setBusyState(SdrSource.BUSYSTATE_BUSY if hasUsers else SdrSource.BUSYSTATE_IDLE) def removeClient(self, c): try: self.clients.remove(c) except ValueError: pass # no need to check for users if we are always-on if self.isAlwaysOn(): return hasUsers = self.hasClients(SdrSource.CLIENT_USER) hasBackgroundTasks = self.hasClients(SdrSource.CLIENT_BACKGROUND) self.setBusyState(SdrSource.BUSYSTATE_BUSY if hasUsers else SdrSource.BUSYSTATE_IDLE) if not hasUsers and not hasBackgroundTasks: self.stop() def addSpectrumClient(self, c): self.spectrumClients.append(c) if self.spectrumThread is None: # local import due to circular depencency from owrx.fft import SpectrumThread self.spectrumThread = SpectrumThread(self) self.spectrumThread.start() def removeSpectrumClient(self, c): try: self.spectrumClients.remove(c) except ValueError: pass if not self.spectrumClients and self.spectrumThread is not None: self.spectrumThread.stop() self.spectrumThread = None def writeSpectrumData(self, data): for c in self.spectrumClients: c.write_spectrum_data(data) def getState(self): return self.state def setState(self, state): if state == self.state: return self.state = state for c in self.clients: c.onStateChange(state) def setBusyState(self, state): if state == self.busyState: return self.busyState = state for c in self.clients: c.onBusyStateChange(state)