airlock-dvslc/main.py

159 lines
4.2 KiB
Python

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