| """Shared GitHub REST session with rate-limit and transient-network retries.""" | |
| from __future__ import annotations | |
| import logging | |
| import time | |
| import requests | |
| log = logging.getLogger(__name__) | |
| GITHUB_API = "https://api.github.com" | |
| _RATE_FLOOR = 200 | |
| _MAX_NETWORK_RETRIES = 8 | |
| _RETRY_BASE_SEC = 2.0 | |
| _TRANSIENT_HTTP = {502, 503, 504, 520, 521, 522, 429} | |
| _TRANSIENT_EXC = ( | |
| requests.exceptions.ConnectionError, | |
| requests.exceptions.Timeout, | |
| requests.exceptions.ChunkedEncodingError, | |
| ) | |
| class GitHubSession: | |
| """requests.Session wrapper: rate limits, 202 polling, network retries.""" | |
| def __init__(self, token: str) -> None: | |
| self._s = requests.Session() | |
| headers = { | |
| "Accept": "application/vnd.github+json", | |
| "X-GitHub-Api-Version": "2022-11-28", | |
| } | |
| if token: | |
| headers["Authorization"] = f"Bearer {token}" | |
| self._s.headers.update(headers) | |
| def get(self, url: str, **kwargs) -> requests.Response: | |
| kwargs.setdefault("timeout", (15, 90)) | |
| attempt = 0 | |
| while True: | |
| attempt += 1 | |
| try: | |
| resp = self._s.get(url, **kwargs) | |
| except _TRANSIENT_EXC as exc: | |
| if attempt >= _MAX_NETWORK_RETRIES: | |
| raise | |
| sleep_sec = min(120.0, _RETRY_BASE_SEC * (2 ** (attempt - 1))) | |
| log.warning( | |
| "Network error on GET (attempt %d/%d), sleeping %.0fs: %s", | |
| attempt, _MAX_NETWORK_RETRIES, sleep_sec, exc, | |
| ) | |
| time.sleep(sleep_sec) | |
| continue | |
| remaining = int(resp.headers.get("X-RateLimit-Remaining", 9999)) | |
| reset_at = int(resp.headers.get("X-RateLimit-Reset", 0)) | |
| if resp.status_code == 403 and remaining == 0: | |
| sleep_sec = max(reset_at - int(time.time()), 0) + 5 | |
| log.warning("Rate limit hit; sleeping %ds", sleep_sec) | |
| time.sleep(sleep_sec) | |
| continue | |
| if resp.status_code == 202: | |
| time.sleep(3) | |
| continue | |
| if resp.status_code in _TRANSIENT_HTTP and attempt < _MAX_NETWORK_RETRIES: | |
| retry_after = int(resp.headers.get("Retry-After", 0)) | |
| sleep_sec = retry_after or min(120.0, _RETRY_BASE_SEC * (2 ** (attempt - 1))) | |
| log.warning( | |
| "HTTP %d on GET (attempt %d/%d), sleeping %.0fs", | |
| resp.status_code, attempt, _MAX_NETWORK_RETRIES, sleep_sec, | |
| ) | |
| time.sleep(sleep_sec) | |
| continue | |
| if remaining < _RATE_FLOOR: | |
| sleep_sec = max(reset_at - int(time.time()), 0) + 2 | |
| log.info("Rate budget low (%d remaining); sleeping %ds", remaining, sleep_sec) | |
| time.sleep(sleep_sec) | |
| return resp | |