Partial Server-Side code for water level meter

app.py

from flask import Flask, jsonify
import threading
import time
import requests
import json
app = Flask(__name__)

max_num_entries = 25
current_entry = 0
#this array will store the last 25 values of the water meter
#initialize to length 25
water_level_entries = [None] * max_num_entries

#if you run this and then go to http://localhost:5000/waterlevel, it will show you the value of water_level_entries
@app.route("/waterlevel")
def return_water_level():
    #this returns your dictionary as JSON, which is a standard data format for HTTP. 
    return json.dumps(water_level_entries)
    
def record_water_level():
  global current_entry
  global water_level_entries
  #TODO fetch water meter value from particle url and parse value
  #let's say it will look something like this
  entry = {'value': 0.1234, 'timestamp': 'Sun Mar 06 2016 12:13:42 GMT-0500 (EST)'}
  #save the current value
  water_level_entries[current_entry] = entry
  #move the current index to store the next value
  current_entry = current_entry + 1
  #we only want to store the last 25 entries, so reset current_index to overrite last value
  if current_entry >= max_num_entries:
    current_entry = 0
  #make the timer value whatever, you want, this would fetch the level once a minute
  threading.Timer(60, record_water_level).start()

record_water_level()

if __name__ == "__main__":
    app.run()