json_db.py

# -*- coding: utf-8 -*-
import json, urllib
from flask import Flask, request, abort
import requests
from pymessenger.bot import Bot
from pprint import pprint

DB_FILE = "data.json"
access_token = 'ACCESS_TOKEN'

bot = Bot(access_token)

with open('data.json') as data_file:
  user_db = json.load(data_file)
  
  
@app.route('/webhook', methods=['POST'])
def post_webhook():
    data = request.json

    if data["object"] == "page":
        for entry in data['entry']:
            for messaging_event in entry['messaging']:

                if "message" in messaging_event:

                    sender_id = messaging_event['sender']['id']
                    
                    
                    # writing and actually persisting the db
                    if sender_id not in user_db:
                      user_db[sender_id] = {}
                      save_db()

                    if 'text' in messaging_event['message']:
                        message_text = messaging_event['message']['text']
                        bot.send_text_message(sender_id, message_text)
    return "ok", 200


def save_db():
  with open('data.json', 'w') as data_file:
    json.dump(user_db, data_file)