relay/relay.py

#!/usr/bin/python3

import RPi.GPIO as GPIO
import time
import requests
import platform

relay_pin = 11
#GPIO.setmode(GPIO.BCM) # GPIO numbers instead of board numbers.
GPIO.setmode(GPIO.BOARD)
GPIO.setup(relay_pin, GPIO.OUT)

device_id = platform.node()  # For servers logs.

def get_api_url():
    # Yes, I know I could do this better. Stop moaning.
    if (device_id == "gallery1"):
        return "http://ritherdon.abbether.net/api/readings/latest/1"
    elif (device_id == "gallery2"):
        return "http://ritherdon.abbether.net/api/readings/latest/2"
      
# Make sure this is valid.
# api_url = "http://ritherdon.abbether.net/api/readings/add/1"
api_url = get_api_url() # Saves having to do the if-check every call.

def main():
    try:
        while True:
            # Make sure the U.R.L. is valid.
            r = requests.get(api_url)
            # print(r.status_code) # For testing.
            data = r.json()
            # print(data) # For testing.
            the_reading = data.get("reading")
            # print(the_reading) # For testing.
            if the_reading > 33:
                # Print for testing.
                # print(f"[INFO] Light is on -- {the_reading}.")
                GPIO.output(relay_pin, GPIO.HIGH)
            else:
                # Print for testing.
                # print(f"[INFO] Light is off -- {the_reading}.")
                GPIO.output(relay_pin, GPIO.LOW)
    except KeyboardInterrupt:
        print("Keyboard Interrupt: quitting program.")
    except:
        print("Error updating light reading...")
    finally:
        print("Cleaning up GPIO before closing...")
        GPIO.cleanup()

if __name__ == "__main__" :
    main()