Integrate PN532 reader, handle disconnections

main.py

@@ -1,4 +1,4 @@
-import os
+import os, sys
 import logging
 logging.basicConfig(
     format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
@@ -13,16 +13,16 @@ import json
 import requests
 import time
 from signal import *
+import binascii
 
 if not TEST:
-    import serial
     import RPi.GPIO as GPIO
+    from pn532pi import Pn532, Pn532Hsu, pn532
 
 import secrets
 
 
 RELAY_PIN = 17
-RFID_EN_PIN = 27
 CARDS_FILE = 'card_data.json'
 OPEN_DURATION = 4
 VALID_PACKAGES = [
@@ -36,55 +36,72 @@ VALID_PACKAGES = [
     'Day Pass Holder',
     'Access to everything 24/7',
     'Barter Membership',
-    'Loft Member',
+    #'Loft Member',
 ]
 
 TEST_PIPE = '/tmp/airlock'
+try:
     os.remove(TEST_PIPE)
+except FileNotFoundError:
+    pass
 
 API_MEMBERS = 'https://fabman.io/api/v1/members?limit=1000&embed=key&embed=activePackages&includeKeyToken=true'
 
-ser = None
+nfc = None
 
 def unlock_door():
     logging.info('Unlocking door...')
 
     if not TEST:
         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)
+
+    logging.info('Done.')
 
 def lock_door_on_exit(*args):
     logging.info('Exiting, locking door...')
 
     if not TEST:
         GPIO.output(RELAY_PIN, GPIO.LOW)
-        GPIO.output(RFID_EN_PIN, GPIO.LOW)
 
     os._exit(0)
 
+def feed_watchdog():
+    if DEBUG or TEST:
+        return
+
+    with open('/dev/watchdog', 'w') as wdt:
+        wdt.write('1')
+
 def init():
-    global ser, cards
+    global nfc, cards
 
     if not TEST:
         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')
 
     if TEST:
         os.mkfifo(TEST_PIPE)
         logging.info('Test pipe initialized')
     else:
-        ser = serial.Serial(port='/dev/ttyAMA0', baudrate=2400, timeout=0.1)
+        PN532_HSU = Pn532Hsu(Pn532Hsu.RPI_MINI_UART)
-        logging.info('Serial initialized')
+        nfc = Pn532(PN532_HSU)
+        nfc.begin()
+        nfc.SAMConfig()
+        version = nfc.getFirmwareVersion()
+        logging.info('NFC reader initialized, verion: %s', version)
+
+        if not version:
+            logging.error('Unable to communicate with reader, waiting 10s and exiting...')
+            time.sleep(10)
+            os._exit(0)
+
 
     for sig in (SIGABRT, SIGILL, SIGINT, SIGSEGV, SIGTERM):
         signal(sig, lock_door_on_exit)
@@ -105,17 +122,23 @@ def reader_thread(card_data_queue):
 
         if TEST:
             with open(TEST_PIPE, 'r') as pipe:
-               card = pipe.readline()
+               success, card = (True, pipe.readline())
         else:
-            card = ser.readline()
+            success, card = nfc.readPassiveTargetID(pn532.PN532_MIFARE_ISO14443A_106KBPS)
-
-        if not card: continue
 
         try:
-            card = card.decode().strip()
+            # ensure we have communication with the reader
-        except AttributeError:
+            if nfc.getFirmwareVersion():
+                feed_watchdog()
+        except:
+            continue
+
+        try:
+            card = binascii.hexlify(card).decode().strip()
+        except TypeError:
             card = card.strip()
-        except UnicodeDecodeError:
+        except:
+            logging.info('Unable to decode card: %s', str(card))
             continue
 
         if len(card) != 14: continue
@@ -125,6 +148,7 @@ def reader_thread(card_data_queue):
         if card in recent_scans:
             if now - recent_scans[card] < 5.0:
                 logging.info('Debounce skipping card scan')
+                time.sleep(1)
                 continue
         recent_scans[card] = now
 
@@ -156,14 +180,10 @@ def reader_thread(card_data_queue):
         #    continue
 
 def get_cards(card_data_queue):
-    try:
     headers = {'Authorization': 'Bearer ' + secrets.FABMAN_API_KEY}
     res = requests.get(API_MEMBERS, headers=headers, timeout=10)
     res.raise_for_status()
     res = res.json()
-    except BaseException as e:
-        logging.exception('Problem GETting Fabman API: {} - {}'.format(e.__class__.__name__, str(e)))
-        return
 
     members = res
     cards = {}
@@ -211,17 +231,15 @@ def update_thread(card_data_queue):
 
     while True:
         logging.info('Updating cards...')
+
+        try:
             get_cards(card_data_queue)
+        except BaseException as e:
+            logging.exception('Problem updating cards: {} - {}'.format(e.__class__.__name__, str(e)))
 
         time.sleep(300)
 
 
-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()
@@ -230,4 +248,3 @@ if __name__ == '__main__':
 
     Process(target=reader_thread, args=(card_data,)).start()
     Process(target=update_thread, args=(card_data,)).start()
-    if not DEBUG: Process(target=watchdog_thread).start()