import json, os, time, hashlib
from pathlib import Path
from urllib.request import Request, urlopen
from urllib.error import HTTPError

def request(url, headers=None, timeout=90, retries=4):
    h={"User-Agent":"vulnerability-apex-project-mirror/1.0", "Accept":"application/json"}
    h.update(headers or {})
    for attempt in range(retries):
        try:
            with urlopen(Request(url,headers=h),timeout=timeout) as response:
                return response.status, response.read(), dict(response.headers)
        except HTTPError as err:
            if err.code == 304: return 304,b'',dict(err.headers)
            if err.code not in (429,500,502,503,504) or attempt==retries-1: raise
        except (TimeoutError, OSError):
            if attempt==retries-1: raise
        time.sleep(min(30, 2**attempt*2))
    raise RuntimeError('unreachable')

def store(path, raw):
    path=Path(path); path.parent.mkdir(parents=True,exist_ok=True)
    if path.exists() and hashlib.sha256(path.read_bytes()).digest()==hashlib.sha256(raw).digest(): return False
    temp=path.with_name(path.name+'.tmp')
    temp.write_bytes(raw); temp.replace(path)
    return True

def state_file(path, value):
    store(path,(json.dumps(value,indent=2,ensure_ascii=False,sort_keys=True)+'\n').encode())