openwebrx-clone/owrx/source/__init__.py

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from owrx.config import PropertyManager
import threading
import subprocess
import os
import socket
import shlex
import time
import signal
import logging
logger = logging.getLogger(__name__)
class SdrSource(object):
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, port):
self.id = id
self.props = props
self.profile_id = None
self.activateProfile()
self.rtlProps = self.props.collect(*self.getEventNames()).defaults(PropertyManager.getSharedInstance())
self.wireEvents()
self.port = port
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
def getEventNames(self):
return [
"samp_rate",
"nmux_memory",
"center_freq",
"ppm",
"rf_gain",
"lna_gain",
"rf_amp",
"antenna",
"if_gain",
"lfo_offset",
]
def wireEvents(self):
def restart(name, value):
logger.debug("restarting sdr source due to property change: {0} changed to {1}".format(name, value))
self.stop()
self.start()
self.rtlProps.wire(restart)
# override this in subclasses
def getCommand(self):
pass
# override this in subclasses, if necessary
def getFormatConversion(self):
return None
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.profile_id = profile_id
profile = profiles[profile_id]
self.props["profile_id"] = profile_id
for (key, value) in profile.items():
# skip the name, that would overwrite the source name.
if key == "name":
continue
self.props[key] = value
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 useNmux(self):
return True
def getCommandValues(self):
dict = self.rtlProps.collect(*self.getEventNames()).__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):
self.modificationLock.acquire()
if self.monitor:
self.modificationLock.release()
return
props = self.rtlProps
cmd = self.getCommand().format(**self.getCommandValues())
format_conversion = self.getFormatConversion()
if format_conversion is not None:
cmd += " | " + format_conversion
if self.useNmux():
nmux_bufcnt = nmux_bufsize = 0
while nmux_bufsize < props["samp_rate"] / 4:
nmux_bufsize += 4096
while nmux_bufsize * nmux_bufcnt < props["nmux_memory"] * 1e6:
nmux_bufcnt += 1
if nmux_bufcnt == 0 or nmux_bufsize == 0:
logger.error(
"Error: nmux_bufsize or nmux_bufcnt is zero. These depend on nmux_memory and samp_rate options in config_webrx.py"
)
self.modificationLock.release()
return
logger.debug("nmux_bufsize = %d, nmux_bufcnt = %d" % (nmux_bufsize, nmux_bufcnt))
cmd = cmd + " | nmux --bufsize %d --bufcnt %d --port %d --address 127.0.0.1" % (
nmux_bufsize,
nmux_bufcnt,
self.port,
)
# don't use shell mode for commands without piping
if "|" in cmd:
self.process = subprocess.Popen(cmd, shell=True, preexec_fn=os.setpgrp)
else:
# preexec_fn 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), preexec_fn=os.setpgrp)
logger.info("Started rtl 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
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try:
self.postStart()
except Exception:
logger.exception("Exception during postStart()")
self.failed = True
self.modificationLock.release()
self.setState(SdrSource.STATE_FAILED if self.failed else SdrSource.STATE_RUNNING)
def postStart(self):
pass
def isAvailable(self):
return self.monitor is not None
def isFailed(self):
return self.failed
def stop(self):
self.setState(SdrSource.STATE_STOPPING)
self.modificationLock.acquire()
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.sleepOnRestart()
self.modificationLock.release()
self.setState(SdrSource.STATE_STOPPED)
def sleepOnRestart(self):
pass
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
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)
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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)