#!/usr/bin/env python
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# Warning #
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# This code should be executed only on POSIX OS with at least 1 GiB free space in /tmp/ directory and RAM!

from aioify import aioify
import os
import shutil


def generate_big_file(filename, file_size):
    with open(file=filename, mode='wb') as f:
        f.write(os.urandom(file_size))


aiogenerate_big_file = aioify(obj=generate_big_file)
aios = aioify(obj=os, name='aios')
aioshutil = aioify(obj=shutil, name='aishutil')


async def main():
    dir_path = '/tmp/big-files/'
    await aios.makedirs(name=dir_path, exist_ok=True)
    filename = os.path.join(dir_path, 'original')
    copy_filename = os.path.join(dir_path, 'copy')
    file_size = 1024 * 1024 * 1024
    await aiogenerate_big_file(filename=filename, file_size=file_size)
    await aioshutil.copy(src=filename, dst=copy_filename)
    await aioshutil.rmtree(path=dir_path)


if __name__ == '__main__':
    import asyncio as aio
    loop = aio.get_event_loop()
    loop.run_until_complete(main())