from argparse import Namespace

import requests.exceptions
from requests import Session
from requests.adapters import HTTPAdapter
from urllib3.util import Retry
from src.logger import logger as l


def fetch(settings: list, args: Namespace) -> None:
    logger = l.getChild(__name__)
    for sets in settings:
        logger.info(f"Working set: {sets}")
        assert type(sets) == dict
        assert 'src' in sets
        assert 'rss' in sets
        s = Session()
        retries = Retry(
            total=3,
            backoff_factor=0.2,
            status_forcelist=[502, 503, 504],
            allowed_methods={'GET'},
        )
        s.mount(sets['src'], HTTPAdapter(max_retries=retries))
        try:
            r = s.get(sets['src'], timeout=3, stream=True)
            if r.status_code == 200:
                logger.info(f"Saving to file: {sets['rss']}")
                with open("{0}/{1}".format(args.directory, sets['rss']), 'wb') as rss:
                    for chunk in r:
                        rss.write(chunk)
        except requests.exceptions.ConnectionError as e:
            logger.warning(f"Unable to fetch {sets['src']}", e)