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https://github.com/Sea-Haven-Industries/open-swe.git
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2070a770c2
* fix: stop storing GitHub tokens in metadata Co-authored-by: open-swe[bot] <215916821+open-swe[bot]@users.noreply.github.com> * fix: bound in-process GitHub token cache with 24h TTL + sweep --------- Co-authored-by: open-swe[bot] <215916821+open-swe[bot]@users.noreply.github.com> Co-authored-by: open-swe[bot] <johannes@langchain.dev>
125 lines
4.3 KiB
Python
125 lines
4.3 KiB
Python
"""GitHub token lookup utilities."""
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from __future__ import annotations
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import logging
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from collections.abc import Mapping
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from datetime import UTC, datetime, timedelta
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from typing import Any
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from langgraph.config import get_config
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logger = logging.getLogger(__name__)
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# Treat tokens with <= this many seconds remaining as expired so we re-auth
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# before kicking off long agent runs.
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_GITHUB_TOKEN_EXPIRY_SKEW_SECONDS = 60
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# Hard cap on how long an entry stays cached regardless of the token's own
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# expiry, so entries for threads that are never read again don't accumulate.
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_GITHUB_TOKEN_MAX_TTL = timedelta(hours=24)
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# thread_id -> (token, token_expires_at, cached_at)
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_GITHUB_TOKEN_CACHE: dict[str, tuple[str, str | None, datetime]] = {}
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class GitHubAuthError(Exception):
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"""Raised when a GitHub call returns 401, signalling a stale/revoked token."""
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def cache_github_token_for_thread(
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thread_id: str, token: str, expires_at: str | None = None
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) -> None:
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"""Cache a GitHub token in process for the current thread."""
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if not thread_id or not token:
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return
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now = datetime.now(UTC)
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_GITHUB_TOKEN_CACHE[thread_id] = (token, expires_at, now)
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_evict_expired(now=now)
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def _is_expired(expires_at: Any, *, now: datetime | None = None) -> bool:
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"""Return True when ``expires_at`` is past (or close to) ``now``."""
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if expires_at is None:
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return False
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parsed: datetime | None = None
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if isinstance(expires_at, int | float):
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try:
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parsed = datetime.fromtimestamp(float(expires_at), tz=UTC)
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except (OverflowError, OSError, ValueError):
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return False
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elif isinstance(expires_at, str):
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raw = expires_at.strip()
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if not raw:
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return False
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if raw.endswith("Z"):
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raw = raw[:-1] + "+00:00"
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try:
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parsed = datetime.fromisoformat(raw)
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except ValueError:
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return False
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if parsed is None:
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return False
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if parsed.tzinfo is None:
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parsed = parsed.replace(tzinfo=UTC)
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current = (now or datetime.now(UTC)).astimezone(UTC)
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return (parsed - current).total_seconds() <= _GITHUB_TOKEN_EXPIRY_SKEW_SECONDS
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def _entry_expired(expires_at: str | None, cached_at: datetime, *, now: datetime) -> bool:
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"""Expired when past the token's own expiry or the 24h cache cap."""
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if now - cached_at >= _GITHUB_TOKEN_MAX_TTL:
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return True
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return _is_expired(expires_at, now=now)
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def _evict_expired(*, now: datetime | None = None) -> None:
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current = now or datetime.now(UTC)
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stale = [
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tid
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for tid, (_token, expires_at, cached_at) in _GITHUB_TOKEN_CACHE.items()
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if _entry_expired(expires_at, cached_at, now=current)
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]
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for tid in stale:
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_GITHUB_TOKEN_CACHE.pop(tid, None)
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def _cached_token_if_fresh(thread_id: str | None) -> tuple[str | None, str | None]:
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if not thread_id:
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return None, None
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cached = _GITHUB_TOKEN_CACHE.get(thread_id)
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if not cached:
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return None, None
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token, expires_at, cached_at = cached
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if _entry_expired(expires_at, cached_at, now=datetime.now(UTC)):
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_GITHUB_TOKEN_CACHE.pop(thread_id, None)
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logger.info("Cached GitHub token for thread %s has expired; re-resolving", thread_id)
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return None, None
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return token, expires_at
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def _thread_id_from_config(run_config: Mapping[str, Any]) -> str | None:
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configurable = run_config.get("configurable", {})
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if not isinstance(configurable, Mapping):
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return None
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thread_id = configurable.get("thread_id")
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return thread_id if isinstance(thread_id, str) and thread_id else None
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def get_github_token(run_config: Mapping[str, Any] | None = None) -> str | None:
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"""Resolve the current thread's GitHub token from process memory."""
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resolved = run_config if run_config is not None else get_config()
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token, _expires_at = _cached_token_if_fresh(_thread_id_from_config(resolved))
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return token
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async def get_github_token_from_thread(thread_id: str) -> tuple[str | None, str | None]:
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"""Resolve the current process's cached GitHub token for a thread."""
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return _cached_token_if_fresh(thread_id)
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async def invalidate_cached_github_token(thread_id: str) -> None:
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"""Clear a cached GitHub token for a thread."""
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_GITHUB_TOKEN_CACHE.pop(thread_id, None)
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logger.info("Invalidated cached GitHub token for thread %s", thread_id)
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