159 lines
4.2 KiB
Python
159 lines
4.2 KiB
Python
import logging
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logging.basicConfig(
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format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
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level=logging.INFO)
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from multiprocessing import Process, Queue
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from queue import Empty
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import RPi.GPIO as GPIO
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import os
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import json
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import requests
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import serial
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import time
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from signal import *
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DEBUG = os.environ.get('DEBUG', False)
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RELAY_PIN = 17
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RFID_EN_PIN = 27
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CARDS_FILE = 'card_data.json'
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OPEN_DURATION = 4
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API_STATS = 'https://api.my.protospace.ca/stats/'
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API_DOOR = 'https://api.my.protospace.ca/door/'
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API_SEEN = lambda x: 'https://api.my.protospace.ca/door/{}/seen/'.format(x)
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ser = None
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def unlock_door():
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GPIO.output(RELAY_PIN, GPIO.HIGH)
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GPIO.output(RFID_EN_PIN, GPIO.HIGH)
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time.sleep(OPEN_DURATION)
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GPIO.output(RELAY_PIN, GPIO.LOW)
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GPIO.output(RFID_EN_PIN, GPIO.LOW)
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def lock_door_on_exit(*args):
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logging.info('Exiting, locking door...')
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GPIO.output(RELAY_PIN, GPIO.LOW)
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GPIO.output(RFID_EN_PIN, GPIO.LOW)
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os._exit(0)
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def init():
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global ser, cards
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GPIO.setwarnings(False)
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GPIO.setmode(GPIO.BCM)
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GPIO.setup(RELAY_PIN, GPIO.OUT)
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GPIO.output(RELAY_PIN, GPIO.LOW)
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GPIO.setup(RFID_EN_PIN, GPIO.OUT)
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GPIO.output(RFID_EN_PIN, GPIO.LOW)
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logging.info('GPIO initialized')
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ser = serial.Serial(port='/dev/ttyAMA0', baudrate=2400, timeout=0.1)
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logging.info('Serial initialized')
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for sig in (SIGABRT, SIGILL, SIGINT, SIGSEGV, SIGTERM):
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signal(sig, lock_door_on_exit)
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logging.info('Signals initialized')
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def reader_thread(card_data_queue):
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recent_scans = {}
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with open(CARDS_FILE, 'r') as f:
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card_data = json.load(f)
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logging.info('Read {} card numbers from disk'.format(str(len(card_data))))
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while True:
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try:
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card_data = card_data_queue.get_nowait()
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except Empty:
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pass
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card = ser.readline()
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if not card: continue
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card = card.decode().strip()
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if len(card) != 10: continue
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# debounce card scans
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now = time.time()
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if card in recent_scans:
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if now - recent_scans[card] < 5.0:
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continue
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recent_scans[card] = now
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logging.info('Read card: ' + card)
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if card in card_data:
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logging.info('Card recognized')
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else:
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logging.info('Card not recognized, denying access')
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continue
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logging.info('DOOR ACCESS - Card: {} | Name: {}'.format(
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card, card_data[card],
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))
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unlock_door()
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try:
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res = requests.post(API_SEEN(card), timeout=2)
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res.raise_for_status()
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except BaseException as e:
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logging.error('Problem POSTing seen: {} - {}'.format(e.__class__.__name__, str(e)))
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continue
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def update_thread(card_data_queue):
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last_card_change = None
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while True:
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time.sleep(5)
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try:
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res = requests.get(API_STATS, timeout=5)
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res.raise_for_status()
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res = res.json()
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except BaseException as e:
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logging.error('Problem GETting stats: {} - {}'.format(e.__class__.__name__, str(e)))
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continue
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if res['last_card_change'] == last_card_change:
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continue
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last_card_change = res['last_card_change']
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logging.info('Cards changed, pulling update from API')
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try:
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res = requests.get(API_DOOR, timeout=5)
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res.raise_for_status()
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res = res.json()
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except BaseException as e:
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logging.error('Problem GETting door: {} - {}'.format(e.__class__.__name__, str(e)))
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continue
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logging.info('Got {} cards from API'.format(str(len(res))))
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card_data_queue.put(res)
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logging.info('Writing data to file')
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with open(CARDS_FILE, 'w') as f:
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json.dump(res, f)
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def watchdog_thread():
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while True:
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with open('/dev/watchdog', 'w') as wdt:
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wdt.write('1')
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time.sleep(1)
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if __name__ == '__main__':
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logging.info('Initializing...')
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init()
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card_data = Queue()
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Process(target=reader_thread, args=(card_data,)).start()
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Process(target=update_thread, args=(card_data,)).start()
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if not DEBUG: Process(target=watchdog_thread).start()
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