#!/usr/bin/env python3

import requests
import random
import string
import pprint


registry_url = "docker-registry.wikimedia.org"


def randstr():
    return ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(5))


def _request(url_part, bust_cache=False):
    headers = {}
    headers["Accept"] = "application/vnd.docker.distribution.manifest.v2+json"
    url = "https://{}{}".format(registry_url, url_part)
    if bust_cache:
        url += "?cache={}".format(randstr())
    response = requests.request("GET", url, headers=headers, stream=True)
    response.raise_for_status()
    return response


def compare_content_length(bust_cache=False):
    r = _request(url, bust_cache)

    try:
        expected = int(r.headers["content-length"])
    except KeyError:
        print("ERROR: {} no content-length header".format(r.url))
        pprint.pprint(r.headers, width=1)
        return

    got = len(r.raw.data)

    if expected != got:
        print("ERROR: {} expected: {} got: {} ".format(img, expected, got))
        pprint.pprint(r.headers, width=1)


img = ["/v2/releng/node10-test-browser/manifests/latest", ]
for url in img:
    compare_content_length()
    compare_content_length(bust_cache=True)