mirror of
https://github.com/brmlab/brmdoor_libnfc.git
synced 2025-06-07 16:14:01 +02:00
124 lines
3.1 KiB
Python
124 lines
3.1 KiB
Python
#!/usr/bin/env python
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import sys
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import threading
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import Queue
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import logging
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import time
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import ConfigParser
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from binascii import hexlify
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from brmdoor_nfc import NFCDevice, NFCError
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from brmdoor_authenticator import UidAuthenticator
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class BrmdoorConfigError(ConfigParser.Error):
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"""
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Signifies that config has missing or bad values.
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"""
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pass
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class BrmdoorConfig(object):
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"""
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Configuration parser. Holds config variables from config file.
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"""
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_defaults = {
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"lock_opened_secs": "5",
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}
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def __init__(self, filename):
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"""
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Parse and read config from given filename.
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@throws ConfigParser.Error if parsing failed
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@throws BrmdoorConfigError if some value was missing or invalid
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"""
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self.config = ConfigParser.SafeConfigParser(defaults=BrmdoorConfig._defaults)
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self.config.read(filename)
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self.authDbFilename = self.config.get("brmdoor", "auth_db_filename")
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self.lockOpenedSecs = self.config.getint("brmdoor", "lock_opened_secs")
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class NfcThread(threading.Thread):
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"""Thread reading data from NFC reader"""
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def __init__(self, uidQueue):
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"""Create thread reading UIDs from PN53x reader.
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"""
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self.uidQueue = uidQueue
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threading.Thread.__init__(self)
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def run(self):
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"""
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Waits for a card to get into reader field. Reads its UID and
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stores it into uidQueue for later authentication check.
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"""
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self.nfc = NFCDevice()
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while True:
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try:
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uid_hex = hexlify(self.nfc.scanUID())
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logging.debug("Got UID %s" % uid_hex)
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if len(uid_hex) > 0:
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self.uidQueue.put(uid_hex)
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time.sleep(0.3)
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except NFCError, e:
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#this exception happens also when scanUID times out
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logging.debug("Failed to wait for RFID card: %s", e)
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class UnlockThread(threading.Thread):
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"""Thread checking UIDs whether they are authorized"""
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def __init__(self, uidQueue, authenticatorDBFname, lockOpenedSecs):
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"""Create thread reading UIDs from PN53x reader.
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"""
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self.uidQueue = uidQueue
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self.authenticatorDBFname = authenticatorDBFname
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self.lockOpenedSecs = lockOpenedSecs
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threading.Thread.__init__(self)
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def run(self):
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"""
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Reads hex UIDs from queue, tries to find them in sqlite database.
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If match in database is found, then unlock the lock (for now
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only logs).
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"""
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self.authenticator = UidAuthenticator(self.authenticatorDBFname)
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while True:
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uid_hex = self.uidQueue.get()
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record = self.authenticator.fetchUidRecord(uid_hex)
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if record is None:
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logging.info("Unknown UID %s", uid_hex)
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time.sleep(1)
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else:
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logging.info("Unlocking for %s", record)
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time.sleep(self.lockOpenedSecs)
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if __name__ == "__main__":
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if len(sys.argv) < 2:
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print >> sys.stderr, "Syntax: brmdoor_nfc_daemon.py brmdoor_nfc.config"
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sys.exit(1)
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config = BrmdoorConfig(sys.argv[1])
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logging.basicConfig(stream=sys.stderr, level=logging.DEBUG,
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format="%(asctime)s %(levelname)s %(message)s [%(pathname)s:%(lineno)d]")
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uidQueue = Queue.Queue(1)
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nfcThread = NfcThread(uidQueue)
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nfcThread.setDaemon(True)
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nfcThread.start()
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unlockThread = UnlockThread(uidQueue, config.authDbFilename, config.lockOpenedSecs)
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unlockThread.setDaemon(True)
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unlockThread.start()
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uidQueue.join()
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