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