one_time_indexer.py

import logging
import logging.config

# Get logging configurations
logging.config.fileConfig('logging.conf')
logging.getLogger().setLevel(logging.WARNING)

import asyncio
from pyrogram import Client
from info import SESSION, USERBOT_STRING_SESSION, API_ID, API_HASH, BOT_TOKEN, CHANNELS
from utils import save_file


async def main():
    """Save old files in database with the help of user bot"""

    user_bot = Client('User-bot', API_ID, API_HASH, session_string=USERBOT_STRING_SESSION, in_memory=True)
    bot = Client(SESSION, API_ID, API_HASH, bot_token=BOT_TOKEN)

    await user_bot.start()
    await bot.start()

    try:
        for channel in CHANNELS:
            async for user_message in user_bot.get_chat_history(channel):
                message = await bot.get_messages(channel, user_message.id, replies=0)
                for file_type in ("document", "video", "audio"):
                    media = getattr(message, file_type, None)
                    if media is not None:
                        break
                else:
                    continue
                media.file_type = file_type
                media.caption = message.caption
                await save_file(media)
    finally:
        await user_bot.stop()
        await bot.stop()


loop = asyncio.get_event_loop()
loop.run_until_complete(main())