openwebrx-clone/owrx/bands.py

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from owrx.modes import Modes
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from datetime import datetime, timezone
import json
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import os
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import logging
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logger = logging.getLogger(__name__)
class Band(object):
def __init__(self, dict):
self.name = dict["name"]
self.lower_bound = dict["lower_bound"]
self.upper_bound = dict["upper_bound"]
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self.frequencies = []
if "frequencies" in dict:
availableModes = [mode.modulation for mode in Modes.getAvailableModes()]
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for (mode, freqs) in dict["frequencies"].items():
if mode not in availableModes:
logger.info(
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'Modulation "{mode}" is not available, bandplan bookmark will not be displayed'.format(
mode=mode
)
)
continue
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if not isinstance(freqs, list):
freqs = [freqs]
for f in freqs:
if not self.inBand(f):
logger.warning(
"Frequency for {mode} on {band} is not within band limits: {frequency}".format(
mode=mode, frequency=f, band=self.name
)
)
continue
self.frequencies.append({"mode": mode, "frequency": f})
def inBand(self, freq):
return self.lower_bound <= freq <= self.upper_bound
def getName(self):
return self.name
def getDialFrequencies(self, range):
(low, hi) = range
return [e for e in self.frequencies if low <= e["frequency"] <= hi]
class Bandplan(object):
sharedInstance = None
@staticmethod
def getSharedInstance():
if Bandplan.sharedInstance is None:
Bandplan.sharedInstance = Bandplan()
return Bandplan.sharedInstance
def __init__(self):
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self.bands = []
self.file_modified = None
self.fileList = ["/etc/openwebrx/bands.json", "bands.json"]
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def _refresh(self):
modified = self._getFileModifiedTimestamp()
if self.file_modified is None or modified > self.file_modified:
logger.debug("reloading bands from disk due to file modification")
self.bands = self._loadBands()
self.file_modified = modified
def _getFileModifiedTimestamp(self):
timestamp = 0
for file in self.fileList:
try:
timestamp = os.path.getmtime(file)
break
except FileNotFoundError:
pass
return datetime.fromtimestamp(timestamp, timezone.utc)
def _loadBands(self):
for file in self.fileList:
try:
f = open(file, "r")
bands_json = json.load(f)
f.close()
return [Band(d) for d in bands_json]
except FileNotFoundError:
pass
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except json.JSONDecodeError:
logger.exception("error while parsing bandplan file %s", file)
return []
except Exception:
logger.exception("error while processing bandplan from %s", file)
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return []
return []
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def findBands(self, freq):
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self._refresh()
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return [band for band in self.bands if band.inBand(freq)]
def findBand(self, freq):
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bands = self.findBands(freq)
if bands:
return bands[0]
else:
return None
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def collectDialFrequencies(self, range):
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self._refresh()
return [e for b in self.bands for e in b.getDialFrequencies(range)]