pydelhi.py

# -*- coding: utf-8 -*-

import json
import logging
import os
import signal
import subprocess
import sys
from datetime import datetime
from time import sleep

import pytz
from pytz import timezone
from telegram import ChatAction, ParseMode
from telegram.ext import CommandHandler, Updater

import meetup_api

logging.basicConfig(
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    level=logging.INFO)

"""
---Process ID Management Starts---
This part of the code helps out when you want to run your program in background using '&'. This will save the process id of the program going in background in a file named 'pid'. Now, when you run you program again, the last one will be terminated with the help of pid. If in case the no process exist with given process id, simply the `pid` file will be deleted and a new one with current pid will be created.  # NOQA
"""
currentPID = os.getpid()
if 'pid' not in os.listdir():
    with open('pid', mode='w') as f:
        print(str(currentPID), file=f)
else:
    with open('pid', mode='r') as f:
        try:
            os.kill(int(f.read()), signal.SIGTERM)
            logging.error(f'Terminating previous instance of {os.path.realpath(__file__)}')
        except ProcessLookupError:
            subprocess.run(['rm', 'pid'])
    with open('pid', mode='w') as f:
        print(str(currentPID), file=f)
"""
---Process ID Management Ends---
"""

"""
---Token/Key Management Starts---
This part will check for the config.json file which holds the Telegram and will also give a user friendly message if they are invalid. New file is created if not present in the project directory.  # NOQA
"""
configError = (
    "Please open config.json file located in the project directory and replace the value '0' of "
    "Telegram-Bot-Token with the Token you recieved from botfather"
)
if 'config.json' not in os.listdir():
    with open('config.json', mode='w') as f:
        json.dump({'Telegram-Bot-Token': 0}, f)
        logging.info(configError)
        sys.exit(0)
else:
    with open('config.json', mode='r') as f:
        config = json.loads(f.read())
        if config['Telegram-Bot-Token']:
            logging.info('Token Present, continuing...')
            TelegramBotToken = config['Telegram-Bot-Token']
        else:
            logging.error(configError)
            sys.exit(0)
"""
---Token/Key Management Ends---
"""

updater = Updater(token=TelegramBotToken)
dispatcher = updater.dispatcher

utc = pytz.utc

logging.info("I'm On..!!")


def typing(bot, update):
    bot.sendChatAction(chat_id=update.message.chat_id,
                       action=ChatAction.TYPING)
    sleep(0.2)


def message(bot, update, link, parse_mode=ParseMode.MARKDOWN):
    bot.sendMessage(chat_id=update.message.chat_id,
                    parse_mode=parse_mode,
                    text=link,
                    )


def chatAction(bot, update, link):
    typing(bot, update)
    message(bot, update, link)


def start(bot, update, args):
    chatAction(
        bot,
        update,
        (
            'Hi, I am PyDelhi Bot ! I exist to serve the PyDelhi Community.\n'
            'Use /help for assistance.'
        ),
    )


def mailing_list(bot, update):
    chatAction(bot, update, 'https://bit.ly/pydelhi-mailinglist')


def website(bot, update):
    chatAction(bot, update, 'https://pydelhi.org/')


def irc(bot, update):
    chatAction(bot, update, 'https://bit.ly/pydelhi-irc')


def twitter(bot, update):
    chatAction(bot, update, 'https://bit.ly/pydelhi-twitter')


def linkedin(bot, update):
    chatAction(bot, update, 'https://in.linkedin.com/company/pydelhi-community')


def meetup(bot, update):
    chatAction(bot, update, 'https://www.meetup.com/pydelhi')


def youtube(bot, update):
    chatAction(bot, update, 'https://www.youtube.com/channel/UC3QVyJ-Zt0QoYAibn4SD20A')


def nextmeetup(bot, update):
    typing(bot, update)
    response = meetup_api.get_next_event('pydelhi')
    if not isinstance(response, dict):
        message(bot, update, "Next meetup hasn't been scheduled yet!")
        return

    name = response['name']
    description = response['plain_text_no_images_description']
    event_link = response['link']
    date_time = response['time'] // 1000
    utc_dt = utc.localize(datetime.utcfromtimestamp(date_time))
    indian_tz = timezone('Asia/Kolkata')
    date_time = utc_dt.astimezone(indian_tz)
    date_time = date_time.strftime('%Y-%m-%d %H:%M:%S %Z%z')
    is_online = response['is_online_event']

    message(
        bot,
        update,
        (
            'Next Meetup ✨\n'
            f'*Name:* {name}\n'
            f'*Description:* {description}\n'
            f'*Date/Time:* {date_time}\n'
            f'*Online?* {is_online}\n'
            '*Location/link:* [Check event page!]\n'
            f'*Event Page:* {event_link}'
        ),
    )


def facebook(bot, update):
    chatAction(bot, update, 'http://bit.ly/pydelhi-facebook')


def github(bot, update):
    chatAction(bot, update, 'http://github.com/pydelhi')


def invitelink(bot, update):
    chatAction(
        bot,
        update,
        (
            'To prevent spamming we have removed invite\n'
            'link from the group, please ping any one of the admin/moderators of\n'
            'PyDelhi to help you add your friend to the group.\n'
        ),
    )


def gethelp(bot, update):
    chatAction(
        bot,
        update,
        (
            'Use one of the following commands\n'
            '/mailinglist - to get PyDelhi Mailing List link\n'
            '/irc - to get a link to Pydelhi IRC channel\n'
            '/twitter - to get Pydelhi Twitter link\n'
            '/linkedin - to get Pydelhi Linkedin link\n'
            '/meetuppage - to get a link to PyDelhi Meetup page\n'
            '/nextmeetup - to get info about next Meetup\n'
            '/nextmeetupschedule - to get schedule of next Meetup\n'
            '/website - to get the official website link\n'
            '/facebook - to get a link to PyDelhi Facebook page\n'
            '/github - to get a link to PyDelhi Github page\n'
            '/invitelink - to get an invite link for PyDelhi Telegram Group of Volunteers\n'
            '/help - to see recursion in action\n\n'
            'To contribute to|modify this bot :\n'
            'https://github.com/realslimshanky/PyDelhi-Bot'
        ),
    )


dispatcher.add_handler(CommandHandler('start', start, pass_args=True))
dispatcher.add_handler(CommandHandler('mailinglist', mailing_list))
dispatcher.add_handler(CommandHandler('website', website))
dispatcher.add_handler(CommandHandler('irc', irc))
dispatcher.add_handler(CommandHandler('twitter', twitter))
dispatcher.add_handler(CommandHandler('linkedin', linkedin))
dispatcher.add_handler(CommandHandler('meetuppage', meetup))
dispatcher.add_handler(CommandHandler('nextmeetup', nextmeetup))
dispatcher.add_handler(CommandHandler('facebook', facebook))
dispatcher.add_handler(CommandHandler('github', github))
dispatcher.add_handler(CommandHandler('invitelink', invitelink))
dispatcher.add_handler(CommandHandler('help', gethelp))

updater.start_polling()