Implementing a feed mode for the reef-pi

feedmode.py

#!/usr/bin/env python

"""Feedmode.py: Feedmode extends reef-pi by implementing a proper feedmode buttom/timer."""

#   Copyright 2018 John Rudolf Lewis
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.

import time, json, requests, datetime
import RPi.GPIO as GPIO

BUTTON_PIN = 12
USERNAME = "reef-pi"
PASSWORD = "reef-pi"
POWERHEAD_ID = 2
RETURNPUMP_ID = 1
FEED_DURATION_SECONDS = 300

feedmode_running = False
feedmode_expire_at = datetime.datetime.now()

def _login():
   session = requests.Session();
   session.post("http://localhost/auth/signin", data = json.dumps({"user":USERNAME,"password":PASSWORD}))
   return session
  
def _toggle_equipment(session, id, on):
   r = session.get("http://localhost/api/equipment/{id}".format(id=id))
   if r.status_code != 200:
      return False
   equipment = json.loads(r.text)
   equipment['on'] = on
   r = session.post("http://localhost/api/equipment/{id}".format(id=id), data = json.dumps(equipment))
   return r.status_code == 200

def _equipment_on(session, id):
   r = session.get("http://localhost/api/equipment/{id}".format(id=id))
   if r.status_code != 200:
      return False
   return json.loads(r.text)['on']

def _on_button_press(channel):
   global feedmode_running
   global feedmode_expire_at

   session = _login()

   if not feedmode_running:
      feedmode_running = True
      feedmode_expire_at = datetime.datetime.now() + datetime.timedelta(seconds=FEED_DURATION_SECONDS)
      _toggle_equipment(session, RETURNPUMP_ID, False)
      print str(datetime.datetime.now()), " ReturnPump turned off."
   elif _equipment_on(session, POWERHEAD_ID):
      _toggle_equipment(session, POWERHEAD_ID, False)
      print str(datetime.datetime.now()), " PowerHead turned off."
   else:
      _toggle_equipment(session, POWERHEAD_ID, True)
      print str(datetime.datetime.now()), " PowerHead turned on."
      _toggle_equipment(session, RETURNPUMP_ID, True)
      print str(datetime.datetime.now()), " ReturnPump turned on."
      feedmode_running = False
      
def _on_timer():
   global feedmode_running
   if feedmode_running and feedmode_expire_at < datetime.datetime.now():
      session = _login()
      _toggle_equipment(session, POWERHEAD_ID, True)
      print str(datetime.datetime.now()), " PowerHead turned on."
      _toggle_equipment(session, RETURNPUMP_ID, True)
      print str(datetime.datetime.now()), " ReturnPump turned on."
      feedmode_running = False

GPIO.setmode(GPIO.BCM)
GPIO.setup(BUTTON_PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.add_event_detect(BUTTON_PIN, GPIO.FALLING, callback=_on_button_press, bouncetime=500)

print str(datetime.datetime.now()), " Ready!"

while True:
   _on_timer()
   time.sleep(1)

Got it. Thanks.