"""Caching request handler with retries."""
import json

import requests
from requests.adapters import HTTPAdapter
from urllib3.util.retry import Retry

session = requests.Session()

retries = Retry(
    total=5,
    backoff_factor=2,
    status_forcelist=[500, 502, 503, 504],
    respect_retry_after_header=True,
)

adapter = HTTPAdapter(max_retries=retries)
session.mount("https://", adapter)
session.mount("http://", adapter)

cache = {}


def request_get_cache(url, headers={}):
    """Cache results of request."""
    global cache
    headers_string = json.dumps(headers)
    key = url + "-" + headers_string
    if key in cache:
        return cache[key]
    cache[key] = session.get(url, headers=headers)
    return cache[key]