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