147 lines
4.7 KiB
Python
147 lines
4.7 KiB
Python
from owrx.storage import Storage
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from csdr.module import ThreadModule
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from pycsdr.types import Format
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from datetime import datetime
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import pickle
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import os
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import re
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import json
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import logging
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logger = logging.getLogger(__name__)
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class Rtl433Parser(ThreadModule):
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def __init__(self, filePrefix: str = "ISM", service: bool = False):
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self.service = service
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self.frequency = 0
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self.data = bytearray(b'')
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self.filePfx = filePrefix
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self.file = None
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self.maxLines = 10000
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self.cntLines = 0
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super().__init__()
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def __del__(self):
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# Close currently open file, if any
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self.closeFile()
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def closeFile(self):
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if self.file is not None:
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try:
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logger.debug("Closing log file '%s'." % self.fileName)
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self.file.close()
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self.file = None
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# Delete excessive files from storage
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logger.debug("Performing storage cleanup...")
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Storage().cleanStoredFiles()
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except Exception as exptn:
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logger.debug("Exception closing file: %s" % str(exptn))
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self.file = None
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def newFile(self, fileName):
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self.closeFile()
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try:
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self.fileName = Storage().getFilePath(fileName + ".txt")
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logger.debug("Opening log file '%s'..." % self.fileName)
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self.file = open(self.fileName, "wb")
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self.cntLines = 0
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except Exception as exptn:
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logger.debug("Exception opening file: %s" % str(exptn))
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self.file = None
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def writeFile(self, data):
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# If no file open, create and open a new file
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if self.file is None:
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self.newFile(Storage().makeFileName(self.filePfx+"-{0}", self.frequency))
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# If file open now...
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if self.file is not None:
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# Write new line into the file
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try:
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self.file.write(data)
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except Exception:
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pass
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# No more than maxLines per file
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self.cntLines = self.cntLines + 1
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if self.cntLines >= self.maxLines:
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self.closeFile()
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def getInputFormat(self) -> Format:
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return Format.CHAR
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def getOutputFormat(self) -> Format:
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return Format.CHAR
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def setDialFrequency(self, frequency: int) -> None:
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self.frequency = frequency
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def myName(self):
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return "%s%s" % (
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"Service" if self.service else "Client",
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" at %dkHz" % (self.frequency // 1000) if self.frequency>0 else ""
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)
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def parse(self, msg: str):
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# Expect JSON data in text form
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return json.loads(msg)
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def run(self):
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logger.debug("%s starting..." % self.myName())
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# Run while there is input data
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while self.doRun:
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# Read input data
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inp = self.reader.read()
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# Terminate if no input data
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if inp is None:
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logger.debug("%s exiting..." % self.myName())
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self.doRun = False
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break
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# Add read data to the buffer
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self.data = self.data + inp.tobytes()
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# Process buffer contents
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out = self.process()
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# Keep processing while there is input to parse
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while out is not None:
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if len(out)>0:
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if isinstance(out, bytes):
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self.writer.write(out)
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elif isinstance(out, str):
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self.writer.write(bytes(out, 'utf-8'))
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else:
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self.writer.write(pickle.dumps(out))
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out = self.process()
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def process(self):
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# No result yet
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out = None
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# Search for end-of-line
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eol = self.data.find(b'\n')
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# If found end-of-line...
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if eol>=0:
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try:
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msg = self.data[0:eol].decode(encoding="utf-8", errors="replace")
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logger.debug("%s: %s" % (self.myName(), msg))
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# If running as a service...
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if self.service:
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# Write message into open log file, including end-of-line
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self.writeFile(self.data[0:eol+1])
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# Empty result
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out = {}
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else:
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# Let parse() function do its thing
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out = self.parse(msg)
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except Exception as exptn:
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logger.debug("%s: Exception parsing: %s" % (self.myName(), str(exptn)))
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# Remove parsed message from input, including end-of-line
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del self.data[0:eol+1]
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# Return parsed result or None if no result yet
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return out
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