openwebrx-clone/owrx/source/__init__.py

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from owrx.config import Config
import threading
import subprocess
import os
import socket
import shlex
import time
import signal
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from abc import ABC, abstractmethod
from owrx.command import CommandMapper
from owrx.socket import getAvailablePort
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from owrx.property import PropertyStack, PropertyLayer
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from owrx.form import Input, TextInput, NumberInput, CheckboxInput
from owrx.form.converter import IntConverter, OptionalConverter
from owrx.form.device import GainInput
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from owrx.controllers.settings import Section
from typing import List
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from enum import Enum, auto
import logging
logger = logging.getLogger(__name__)
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class SdrSourceState(Enum):
STOPPED = "Stopped"
STARTING = "Starting"
RUNNING = "Running"
STOPPING = "Stopping"
TUNING = "Tuning"
FAILED = "Failed"
def __str__(self):
return self.value
class SdrBusyState(Enum):
IDLE = auto()
BUSY = auto()
class SdrClientClass(Enum):
INACTIVE = auto()
BACKGROUND = auto()
USER = auto()
class SdrSourceEventClient(ABC):
@abstractmethod
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def onStateChange(self, state: SdrSourceState):
pass
@abstractmethod
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def onBusyStateChange(self, state: SdrBusyState):
pass
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def getClientClass(self) -> SdrClientClass:
return SdrClientClass.INACTIVE
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class SdrSource(ABC):
def __init__(self, id, props):
self.id = id
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self.commandMapper = None
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self.props = PropertyStack()
# layer 0 reserved for profile properties
self.props.addLayer(1, props)
# the sdr_id is constant, so we put it in a separate layer
# this is used to detect device changes, that are then sent to the client
sdrIdLayer = PropertyLayer()
sdrIdLayer["sdr_id"] = id
self.props.addLayer(2, sdrIdLayer.readonly())
self.props.addLayer(3, Config.get())
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self.sdrProps = self.props.filter(*self.getEventNames())
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self.profile_id = None
self.activateProfile()
self.wireEvents()
self.port = getAvailablePort()
self.monitor = None
self.clients = []
self.spectrumClients = []
self.spectrumThread = None
self.spectrumLock = threading.Lock()
self.process = None
self.modificationLock = threading.Lock()
self.failed = False
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self.state = SdrSourceState.STOPPED
self.busyState = SdrBusyState.IDLE
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self.validateProfiles()
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if self.isAlwaysOn():
self.start()
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def validateProfiles(self):
props = PropertyStack()
props.addLayer(1, self.props)
for id, p in self.props["profiles"].items():
props.replaceLayer(0, self._getProfilePropertyLayer(p))
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
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
if "start_freq" in props:
start_freq = props["start_freq"]
srh = props["samp_rate"] / 2
center_freq = props["center_freq"]
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):
layer = PropertyLayer()
for (key, value) in profile.items():
# skip the name, that would overwrite the source name.
if key == "name":
continue
layer[key] = value
return layer
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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",
] + list(self.getCommandMapper().keys())
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def getCommandMapper(self):
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if self.commandMapper is None:
self.commandMapper = CommandMapper()
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return self.commandMapper
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@abstractmethod
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def onPropertyChange(self, changes):
pass
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def wireEvents(self):
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self.sdrProps.wire(self.onPropertyChange)
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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]
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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
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profile = profiles[profile_id]
self.profile_id = profile_id
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layer = self._getProfilePropertyLayer(profile)
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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):
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dict = self.sdrProps.__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):
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with self.modificationLock:
if self.monitor:
return
if self.isFailed():
return
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try:
self.preStart()
except Exception:
logger.exception("Exception during preStart()")
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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)
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else:
# single command
cmd = cmd[0]
# 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
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
def wait_for_process_to_end():
rc = self.process.wait()
logger.debug("shut down with RC={0}".format(rc))
self.monitor = None
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if self.getState() is SdrSourceState.RUNNING:
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self.failed = True
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self.setState(SdrSourceState.FAILED)
else:
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self.setState(SdrSourceState.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()
retries = 1000
while retries > 0 and not self.isFailed():
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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
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try:
self.postStart()
except Exception:
logger.exception("Exception during postStart()")
self.failed = True
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self.setState(SdrSourceState.FAILED if self.failed else SdrSourceState.RUNNING)
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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):
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"""
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):
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self.setState(SdrSourceState.STOPPING)
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with self.modificationLock:
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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()
def hasClients(self, *args):
clients = [c for c in self.clients if c.getClientClass() in args]
return len(clients) > 0
def addClient(self, c: SdrSourceEventClient):
self.clients.append(c)
c.onStateChange(self.getState())
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hasUsers = self.hasClients(SdrClientClass.USER)
hasBackgroundTasks = self.hasClients(SdrClientClass.BACKGROUND)
if hasUsers or hasBackgroundTasks:
self.start()
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self.setBusyState(SdrBusyState.BUSY if hasUsers else SdrBusyState.IDLE)
def removeClient(self, c: SdrSourceEventClient):
try:
self.clients.remove(c)
except ValueError:
pass
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hasUsers = self.hasClients(SdrClientClass.USER)
self.setBusyState(SdrBusyState.BUSY if hasUsers else SdrBusyState.IDLE)
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# no need to check for users if we are always-on
if self.isAlwaysOn():
return
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hasBackgroundTasks = self.hasClients(SdrClientClass.BACKGROUND)
if not hasUsers and not hasBackgroundTasks:
self.stop()
def addSpectrumClient(self, c):
if c in self.spectrumClients:
return
# local import due to circular depencency
from owrx.fft import SpectrumThread
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self.spectrumClients.append(c)
with self.spectrumLock:
if self.spectrumThread is None:
self.spectrumThread = SpectrumThread(self)
self.spectrumThread.start()
def removeSpectrumClient(self, c):
try:
self.spectrumClients.remove(c)
except ValueError:
pass
with self.spectrumLock:
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)
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def getState(self) -> SdrSourceState:
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return self.state
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def setState(self, state: SdrSourceState):
if state == self.state:
return
self.state = state
for c in self.clients:
c.onStateChange(state)
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def setBusyState(self, state: SdrBusyState):
if state == self.busyState:
return
self.busyState = state
for c in self.clients:
c.onBusyStateChange(state)
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class SdrDeviceDescriptionMissing(Exception):
pass
class SdrDeviceDescription(object):
@staticmethod
def getByType(sdr_type: str) -> "SdrDeviceDescription":
try:
className = "".join(x for x in sdr_type.title() if x.isalnum()) + "DeviceDescription"
module = __import__("owrx.source.{0}".format(sdr_type), fromlist=[className])
cls = getattr(module, className)
return cls()
except (ModuleNotFoundError, AttributeError):
raise SdrDeviceDescriptionMissing("Device description for type {} not available".format(sdr_type))
def getInputs(self) -> List[Input]:
return [
TextInput("name", "Device name"),
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NumberInput(
"ppm",
"Frequency correction",
append="ppm",
converter=OptionalConverter(IntConverter(), defaultFormValue="0"),
),
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CheckboxInput(
"always-on",
"",
checkboxText="Keep device running at all times",
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infotext="Prevents shutdown of the device when idle. Useful for devices with unreliable startup.",
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converter=OptionalConverter(defaultFormValue=False),
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),
CheckboxInput(
"services",
"",
"Run background services on this device",
converter=OptionalConverter(defaultFormValue=True),
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),
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GainInput("rf_gain", "Device gain"),
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NumberInput(
"lfo_offset",
"Oscilator offset",
append="Hz",
infotext="Use this when the actual receiving frequency differs from the frequency to be tuned on the"
+ " device. <br/> Formula: Center frequency + oscillator offset = sdr tune frequency",
converter=OptionalConverter(),
),
NumberInput("waterfall_min_level", "Lowest waterfall level", append="dBFS", converter=OptionalConverter()),
NumberInput("waterfall_max_level", "Highest waterfall level", append="dBFS", converter=OptionalConverter()),
# TODO `schedule`
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]
def mergeInputs(self, *args):
# build a dictionary indexed by the input id to make sure every id only exists once
inputs = {input.id: input for input_list in args for input in input_list}
return inputs.values()
def getSection(self):
return Section("Device settings", *self.getInputs())