door-open-v2.py

door-open-v2.py

import http.server
import socketserver
import RPi.GPIO as GPIO
import time

PORT = 31234
chan = 7
monitor = 14
doSleep = False
uuid = 'still-secret'

GPIO.setmode(GPIO.BCM)
GPIO.setup(chan, GPIO.OUT)
GPIO.output(chan, GPIO.LOW)
GPIO.setup(monitor, GPIO.IN, pull_up_down=GPIO.PUD_UP)

class MyHandler(http.server.SimpleHTTPRequestHandler):
  def do_HEAD(self):
    self.send_response(200)
    self.send_header("Content-Type", "application/json")
    self.end_headers()

  def do_GET(self):

    if GPIO.input(monitor) != 1:
      print("Door not in expected state -- possible wedged relay")
      self.send_response(503)
      self.send_header("Content-Type", "application/json")
      self.end_headers()
      self.wfile.write(b'{"error": "door not in expected state -- possible wedged relay"}')
      return
    
    if self.path.startswith('/healthz'):
      self.send_response(200)
      self.send_header("Content-Type", "text/plain")
      self.end_headers()
      self.wfile.write(b'ok')
      return

    if not self.path.startswith('/' + uuid):
      self.send_response(403)
      self.end_headers()
      return

    global doSleep
    print("Doing door...")
    GPIO.output(chan, GPIO.HIGH)
    time.sleep(0.5)

    if GPIO.input(monitor) != 0:
      GPIO.output(chan, GPIO.LOW)
      print("Door actuation failed -- disconnected?")
      self.send_response(502)
      self.send_header("Content-Type", "application/json")
      self.end_headers()
      self.wfile.write(b'{"error": "door actuation failed -- possibly disconnected"}')
      return
    print("Done door.")

    self.send_response(200)
    self.send_header("Content-Type", "application/json")
    self.end_headers()
    self.wfile.write(b'{"error": null}')
    doSleep = True

Handler = MyHandler
with socketserver.TCPServer(("", PORT), Handler) as httpd:
  while True:
    doSleep = False
    GPIO.output(chan, GPIO.LOW)
    httpd.handle_request()
    if doSleep:
      time.sleep(7)
      print("Door done.")