import time
import base64

from cryptography import fernet
from aiohttp import web
from aiohttp.web import Request, Response
from aiohttp_session import setup, get_session
from aiohttp_session.cookie_storage import EncryptedCookieStorage


async def handler(request: Request) -> Response:
    session = await get_session(request)
    other_thing = session['other_thing'] if 'other_thing' in session else None
    last_visit = session['last_visit'] if 'last_visit' in session else None
    session['last_visit'] = time.time()

    to_string = "a"*2900
    session['other_thing'] = to_string

    text = f'Last visited: {last_visit}, other_thing: {other_thing}'
    return web.Response(text=text)


def make_app():
    app = web.Application()
    # secret_key must be 32 url-safe base64-encoded bytes
    fernet_key = fernet.Fernet.generate_key()
    secret_key = base64.urlsafe_b64decode(fernet_key)
    setup(app, EncryptedCookieStorage(secret_key))
    app.router.add_get('/', handler)
    return app

web.run_app(make_app(), host="localhost")